SUBSTANCE: invention relates to aqueous compositions for gluing substrates, a method of obtaining such compositions, as well as a method of making latent-reactive coatings, films and powders from said compositions. The aqueous compositions for gluing substrates contain: polymers dispersed in water, having groups capable of reacting with isocyanate, such as urethane groups and urea groups; at least one dispersed solid aliphatic polyisocyanate which is not surface-active, with softening temperature higher than or equal to 40°C; one or more compounds of group (subgroup) 5 and 6 elements, in which the oxidation state of said element is at least +4; and optionally other additives and auxiliary materials.
EFFECT: obtaining novel compositions for gluing substrates and latent-reactive coatings, films and powders based thereon, which are stable during storage and stable with respect to colour.
18 cl, 1 dwg, 6 ex
The invention relates to adhesives based on aqueous dispersions and devoid of surface activity of the particles isocyanate, and made of such dispersions, coatings, films, and powders having latent reactivity.
The dispersion polymers of polyurethane having a linear polymer chain, crystallizing at temperatures below 100°, used among other things for being activated by heat bonding temperature sensitive substrates. When working with one-component composition, i.e. without addition of a crosslinking agent, it is possible to achieve only a low thermal stability, which correlated with temperature testing or plasticization of the polymer. In addition, resistance to hydrolysis when the one-component method of execution is insufficient for many applications. For this reason, aqueous polymers usually work, adding liquid polyisocyanates, past hydrophilic modification. Advantage, which is to improve qualities, it is possible to achieve, however, due to the additional labor to work in two-component form. A two-component mixture must produce directly before processing the dispersion. In addition, when two-way increases the likelihood of errors when adding the desired number is TBA isocyanate component and preserve the homogeneity of its introduction.
The period of viability of the two-component mixture, depending on the form of a polymer dispersion or isocyanate component is 1-12 hours in Addition, the dried layers of glue should be used for about 1-12 hours, because otherwise, due to the reaction of the cross-linkage due to isocyanate groups is more impossible the use of the polymer under normal conditions of bonding under the influence of heat.
This implies another disadvantage of this method of work: the stages of application and curing, i.e. applying a dispersion adhesives and induced heating of the cross-linkage, it is impossible to separate in space and time. From an economic point of view, however, this division is appropriate and desirable in many applications.
For this reason, in recent years actively worked on dispersion compositions with solid fine isocyanates. These so-called latent-reactive dispersion adhesive is composed of at least one dispersion of a polymer capable of reacting with isocyanates, and solids isocyanate. Aqueous compositions comprising dispersions of polymers capable of reacting with isocyanates, and oligomeric solid isocyanates, devoid of surface activity, containing uretdione group and located in Melk is dispersed distribution, as well as their use as a latent-reactive binding agent for coatings, and adhesives, has been known for several years.
Under deprived of surface activity of the particles isocyanate imply such a solid isocyanates, in which 0.1 to 25, preferably 0.5 to 8 equivalent percent of the isocyanate groups present in the particles isocyanate underwent reaction with the deactivating agent. Deactivation of the particles isocyanate can including be done with deactivating agents described in European application EP-A 0204970, U.S. patent US 4595445 and German patent DE 10140206.
The particles isocyanate, devoid of surface activity, are fundamentally different from blocked isocyanates. The particles isocyanate deprived of surface activity, preferably 92-99,5 equivalent percent of the isocyanate groups are free. On the contrary, in the blocked isocyanate all isocyanate groups have undergone reaction with a blocking agent. For the reaction cross-linkage in the blocked isocyanate you must first release the isocyanate group, for example, by reverse cleavage of the blocking agent. In the case of particles isocyanate deprived of surface activity, in response to the release of the isocyanate groups is not necessary.
In European application EP-A 0204970 described method and is for drinking, preparing stable dispersions of small particles of MDI by processing polyisocyanates in the liquid stabilizers and impact of significant efforts lateral shear or grinding. You can use these diisocyanates and polyisocyanates, the melting temperature of which exceeds 10°C, preferably above 40°C. Described dispersion is used as agents of cross-linking.
In European application EP-A 1172390 outlined description stable during storage of the dispersion of the isocyanate consisting of the deactivated isocyanates and polymers capable of reacting with isocyanates, in which after removal of water at temperatures from 5 to 40°C is cross stitching. Aqueous dispersion compositions are characterized by good storage stability.
The disadvantage of this method of work described in this publication is that mainly dry coatings, films or powders unstable during storage. The reaction of the cross-linkage begins with the drying of the layers. To achieve this method of operation is desired spatial and temporal separation of the stages of application/drying layer dispersion and bonding the bonding elements is impossible.
In European application EP-A 1134245 described stable during storage of the composition consisting of fine powders of diisocyanate and MDI, which can without depriving their surface activity directly enter in water dispersion, capable of reacting with isocyanate polymers. The reaction of cross-linking these songs start heating the dried layer to a temperature of at least 65°C.
The disadvantage of this method of operation described in this document, again, is that these compositions cannot get stable when stored latent-reactive coatings, films or powders. Using this method works well as it is impossible to achieve the desired spatial and temporal separation of the stages of application/drying layer dispersion and bonding the bonding elements.
European application EP-A 0922720 describes a method of applying aqueous dispersions containing at least one devoid of surface activity of the polyisocyanate and at least one is capable to react with isocyanate polymer, for making stable when stored at room temperature, latent-reactive layers or powders, in which the heat causes the transverse stitching.
As polyisocyanates can be applied to all aliphatic, cycloaliphatic, heterocyclic or aromatic isocyanates, melting point above 40°C. On the stability of previously applied coatings, films or powders, as well as on the reaction rate in induced heating cross-linking can affect the type of isocyanate, the amount of the stabilizer surface activity, solubility parameters of a dispersion of the polymer and the catalyst.
As catalysts indicated represents all the major catalysts for the polyurethane reaction, as compounds of tin, iron, lead, cobalt, bismuth, antimony and zinc, or mixtures thereof, allylmercaptan connection dibutylamine, and tertiary amines.
According to the European application EP-A 0922720 this gives you the opportunity to create a sustainable storing latent-reactive coatings, films and powders. Thus, it is possible in principle desirable spatial and temporal separation of applying adhesive and process connections.
If, however, as solid isocyanate used solid aromatic isocyanates, due to exposure to long-wave ultraviolet radiation contained in sunlight, with age, the adhesive layer yellow (Kunststoff Handbuch 7, 605-608 (1993)).
In adhesive joints, where the adhesive layer is visible (for example, gluing paper and films when storing documents with a high degree of protection), or where the adhesive layer is not completely closed substrates (for example, gluing soles in the manufacture of sports shoes), it is the yellow staining is undesirable.
As aliphatic isocyanates or polyurethanes based on aliphatic isocyanates do not absorb short-wave ultraviolet radiation of sunlight, these polyurethanes are in principle protected from a yellow colour. Therefore, the use of solid aliphatic isocyanates, deprived of the surface and the activity, particularly suitable in areas where important not acquiring coloring latent-reactive coating, latent-reactive film or latent-reactive powders.
However, aliphatic isocyanates have the disadvantage that, compared with aromaticheski bound isocyanate groups they are known to have lower reactivity. It is known, for example, from Ullmann''s Encyclopedia of Industrial Chemistry, Sixth Edition, Vol.18, S. 609, Wiley-VCH Verlag, 2002, Isocyanantes, Organic. For this reason, the use of latent-reactive coatings, films or powders on the basis of the deactivated aliphatic isocyanates still failed to put in practice. Thus, the relative ability of free isocyanate groups isocyanurate from isophorondiisocyanate (IPDI, IPDI) to react with hydroxyl groups is about 50 times lower than the power of free isocyanate groups of the aromatic 1-methyl-2,4-phenylenediamine (TDI dimer, TDI-dimer) to react with hydroxyl groups.
For the cross-linkage latent-reactive coatings, films or powders according to the European application EP-A 0922720 containing as a component of knitting deactivated solid aliphatic isocyanate, required or
a) a very long time exposure at high temperatures, in order to bring the reaction of crosslinking to achieve sufficient density of crosslinking, either>
b) a catalyst which accelerates the reaction between the aliphatic isocyanate groups and capable of reacting with isocyanate polymer to such an extent that the reaction of crosslinking could reach the desired density knitting after a brief heat exposure.
In the absence of catalyst, the reaction cross-linkage in these stable when stored latent-reactive coatings, films or powders proceeds so slowly that the use of this technology with economic benefits is impossible. So, to achieve a sufficiently high density of cross-linking in the adhesive connection latent-reactive film, made with the use of IPDI-trimer (IPDI-trimer) as a solid isocyanate should be kept at 120°C for at least 30 minutes
The catalysts described in the publication EP-A 0922720 (compounds of tin, iron, lead, cobalt, bismuth, antimony and zinc, or mixtures thereof, allylmercaptan connection dibutylamine, and tertiary amines) is a typical catalysts used for the reaction with isocyanates. Each of these catalysts, from the point of view of their use in the manufacture of latent-reactive coatings, latent-reactive film or latent-reactive powders, has, however, drawbacks that do not allow them to use.
Thus, organic compounds is fishing (IV), as, for example, dilaurate dibutyrate (DBTL)in the General case is dirty debutalbum or tributiloltin, as is known from the document "Assessment of the risk to health and environment posed by the use of organostannic compounds (excluded use as biocide in antifouling paints) and a description of the economic profile of the industry, Final report 19 July 2002, European Commission Health &Consumer Protection Directorate-General". From an environmental point of view, the use of compounds of tin (IV) is also undesirable. In addition, organic compounds of tin (IV) addition reaction of isocyanate catalyze the hydrolysis of the polyester segment politicaleconomic polymer chains used in able to react with isocyanates in dispersion polymers for latent-reactive coatings. Therefore, organic compounds of tin (IV) cannot be used for the catalysis of the reaction deprived of solid surface activity of aliphatic isocyanates with capable of reacting with isocyanates crystalline polyurethane dispersion polymers based on complex polyether polyols.
In addition, the service life of the catalysts of the present technical level in the water systems tends to be limited, i.e. under the influence of water is more or less rapid hydrolysis catalyst. This is true for both aqueous composition consisting of a deprived solid surface activity of aliphatic isocyanates and capable of reacting with isocyano the AMI dispersed polymers and mostly dry latent-reactive coatings, which typically have a residual moisture, component of 0.6 - 1.0 wt.% water by weight of the coating. It particularly relates to compounds of tin (IV), which are widely used in conventional systems, for example, the already mentioned DBTL or bismuth carboxylates, such as, for example, 2-ethylhexanoate bismuth (III) (K-Kat, King Industries, Norwalk, CT, USA)described including in the international application WO 00/047642.
Of course, in the colorless layers of adhesive cannot be applied colored or giving staining catalysts. Therefore, the application described in European application EP-A 0992720 catalysts based on iron, cobalt or bismuth in layers of adhesive without coloring the impossible.
Lead compounds and antimony also unfavorable from the point of view of their Toxicological characteristics and harm to the environment, so they should not be used in principle.
Another problem during the catalysis reaction between deprived of surface activity of the solid isocyanate and capable to react with isocyanate dispersion polymer are ionic groups necessary for hydrophilization polymer chain of the dispersion polymer. Hydrophilization can be achieved through built-in polymer chain carboxyl groups. Under certain circumstances these to roxannie groups can inhibit the catalytic activity of ORGANOTIN compounds by complexation. This is true for all lisovich acids with large charge, as, for example, compounds of titanium (IV), zirconium (IV). Universal catalyst, suitable for use with many deprived of surface activity solid aliphatic isocyanates, polyisocyanates and hydrophilizing binding agents should not engage in interaction with such gidrofilizatsii agents.
In European application EP-A 1599525 described catalysts for the rapid solidification of polyisocyanates with polyols containing polyurethane systems.
Isocyanate or polyisocyanate components, which according to theoretical statement can be applied is any organic polyisocyanates with aliphatic, cycloaliphatic, analiticheskie and/or aromaticheski bound free isocyanate groups, which at room temperature are liquid or which to this end is diluted with solvents. The viscosity of the isocyanate (polyisocyanate component comprises at 23°C 10-15000 MPa·S.
In particular, the invention concerns a catalyst, accelerating the solidification of polyisocyanates with polyols in the presence of water as solvent (so-called aqueous two-component polyurethane varnish, aqueous varnish 2K-PUR). The task of this invention consisted in that is, to find catalysts which accelerate the reaction between the isocyanate and the alcohol or polyol in the presence of water or accelerate the solidification of water systems 2K-PUR, without influence on the lifetime of these mixtures. This challenge was addressed through the use of various salts of elements of the 5th and 6th groups (subgroups) of the periodic system of elements, in which the oxidation state of a particular element was at least +4.
In addition to catalysts based on metals in European application EP-A 0992720 as effective catalysts described tertiary amines. However, as already discussed in the document EP-A 0992720, tertiary amines, lose their effectiveness, absorbing carbon dioxide from the air. In the case of latent-reactive coatings, films or powders this fact is particularly bad, because for latent-reactive adhesive layers is extremely important to the stability of the coatings, films or powders during storage, including from the point of view of speed of cross-linking.
Therefore, before the present invention was to provide compositions of aqueous dispersions or mixtures of dispersions of polymers capable of reacting with isocyanates, and solids aliphatic isocyanates, deprived of surface activity, and catalyst, with which you can create latent-reactive covered what I latent-reactive film and latent-reactive powders, stable during storage and stable in color. The catalysts should possess favorable characteristics from a Toxicological point of view. It is necessary that the reaction of cross-linking took place in coatings, films or powders with acceptable from the point of view of the techniques for the duration of the temperature activation.
This problem is solved according to theoretical presentation of this application: it has been unexpectedly discovered that compounds of elements of the 5th and 6th sub-groups of the periodic system of elements, in which the oxidation state of a particular element was at least +4, catalyze the reaction between deprived of surface activity of the solid isocyanate and capable to react with isocyanate polymer so that the cross-linkage reaction takes place at temperatures not exceeding 120°C, and is largely completed within at most 10 minutes. In addition, with the use of the catalysts according to the invention can achieve the stability of the latent-reactive coatings, films/canvases or powders during storage for at least 3 months.
Compositions according to the invention, therefore, is a mixture of the following components:
a) aqueous dispersions or mixtures of dispersions of at least the underwater polymer with groups capable of reacting with isocyanates;
b) finely dispersed solid aliphatic MDI devoid of surface activity and at least for the most part suspended in water;
c) at least one compound of elements of the 5th and 6th sub-groups of the periodic system of elements, in which the oxidation state of this element is at least +4;
d) optionally, other additives and auxiliary substances.
Water latent-reactive composition according to the invention can be applied to flat or having a three-dimensional surface structure in any way, for example by spraying, by means of a squeegee, floor brush or rollers. After drying receive latent-reactive coating (preliminary).
They can also be applied by spraying, by means of a squeegee, floor brush or rollers for separating the paper (for example, silicone paper, or paper with a polyolefin in order to prevent adhesion, or similar materials-media). After drying receive unreinforced latent-reactive film or canvas, which, if necessary after attachment separating the paper can be rolled up into rolls and stored until use as an adhesive film.
Using the proper techniques of the compositions according to the invention can be obtained TBE the Dyje substances in the form of granulates or powders.
Of the compositions according to the invention can, for example, by spray drying to remove the water. So get latent-reactive powders, the particle size of which if necessary can be reduced in the process of grinding in the next stage.
Latent-reactive powders can also be obtained by coagulation of the dispersions of polymer particles isocyanate devoid of surface activity. This mixture of dispersions of polymers, for example uninstalation and devoid of surface activity of solid isocyanates, was dispersed using a mixer type "rotor-stator" (for example, manufactured by Kotthoff) or jet disperser in a solution of salts with polyvalent cations (such as CA2+MD2+, Al3+). Contact anionic groups on the surface of particles of polymer with multivalent cations occurs immediately coagulation of the polymer particles, and solids isocyanate devoid of surface activity, are included in the coagulate. Water coagulate almost completely removed by filtration, centrifugation, etc. and then dried at a temperature below the reaction temperature de-activated solid aliphatic isocyanate. After drying, the size of the particles coagulate if necessary, you can bring up to desired values by grinding,for example, in ball mills, Hollander, sand mills or jet mills.
Another possibility is the production of latent reactive powders consists in freezing the mixture of polymer and devoid of surface activity of the solid isocyanate from aqueous compositions at temperatures below 0°C. After that, the fallen in the sediment mixture of polymer and isocyanate remove the water by filtration, centrifugation, etc. and then dried. The particle size of coarse-grained powder can then, if necessary, to bring to desired values by grinding, and the grinding in certain circumstances should be held at a low temperature, for example, ball mills, Hollander, sand mills or jet mills.
Drying latent-reactive coatings, films, paintings or powders should be carried out at temperatures below the temperature plasticization of the polymer or the melting temperature or plasticization devoid of surface activity of solid aliphatic isocyanate. It should focus on the lowest of the temperatures of the plasticizing or melting. If one of the specified temperature is exceeded, then this inevitably leads to cross-linking of the polymer. Residual moisture latent-reactive coatings, films or powders is a value of 0.1%.
Water dispersion for compositions according to the invention as capable of reacting with isocyanate polymer dispersion preferably contains a dispersion of polyurethane or polyurea with a crystalline polyester soft segments. Particularly preferred dispersions are able to react with isocyanates in polyurethane polymers of the crystalline polymer chains, which in the measurement methods of thermomechanical analysis at least partially decrystallized at temperatures between 50 and 120°C.
Solid isocyanates are all aliphatic and cycloaliphatic diisocyanates and polyisocyanates, temperature plasticization of not less than 40°C. In particular, according to the invention can be applied to the products of the dimerization and trimerization of isophorondiisocyanate (Desmodur®I, Bayer MaterialScience AG, Leverkusen), bis-(4-isocyanatophenyl)-methane (Desmodur®W, Bayer MaterialScience AG, Leverkusen), ω,ω'-diisocyanate-1,3-dimethylcyclohexane (H6XDI), and a mixture of these products of the dimerization and trimerization and blended trimerized products Desmodur®I and Desmodur®W, Desmodur®I and Desmodur®H (Desmodur®H represents hexamethylenediisocyanate) Desmodur®W and Desmodur®H, Desmodur W and H6XDI, Desmodur®I and H6XDI.
The particle size of solid aliphatic isocyanates according to izobreteny is necessary before application by using appropriate technologies of grinding, for example, in ball mills, Hollander, sandy, disk or jet mills to bring to the d50 values<100 μm, preferably d50<10 μm, and particularly preferably to a value of d50<2 μm.
Devoid of surface activity isocyanates in suspension can be produced by methods known from European application EP-A 0992720 and EP-A 1172390.
As catalysts according to the invention can in General be used to connect the elements of the 5th and 6th sub-groups of the periodic system of elements, in which the oxidation state of this element is at least +4. It is preferable to apply salt in which these elements have a specified degree of oxidation. In particular, proved to be particularly suitable compounds of the elements vanadium, niobium, tantalum, molybdenum and tungsten, which in this regard is preferred. Such compounds of the elements vanadium, tantalum, molybdenum and tungsten, for example, salts of molybdenum acid, for example, salts formed molybdenum acid and alkali metals as well as salts formed by alkali metals and vanadium acid, as well as molybdate tetradecylphosphonic, magnesium molybdate, calcium molybdate, zinc molybdate, lithium tungstate, potassium tungstate, tungstic acid, ammonium tungstate, phosphorus-tungsten acid, niobate sodium and tantalum sodium. Especially repectfully alkali metal salts of vanadium and molybdenum.
Relatively dry coating (preliminary)of the dried film or dried powder quantity of the used catalyst are 10-50000 ppm, the catalyst efficiency is not dependent on how it was added. This means that the catalyst can
- add to aqueous dispersions of polymers
- add in the manufacture or disabling the surface activity of the solid isocyanate or
- to enter it into a composition consisting of a dispersion of polymer devoid of surface activity of the solid isocyanate and, if necessary, other additives and auxiliary substances.
In addition to the efficiency of catalysis used according to the invention catalysts are also some latent phase (delay in the manifestation of catalytic activity) during thermal activation. This is favorable for latent-reactive coatings (preliminary), film, canvas or powders effect ensures the absence of any influence of the catalyst on the storage stability latent-reactive adhesive layers, films, paintings or powders.
This phenomenon is presented in figure 1 for the example of the development of the module save the two films of adhesive (Dispercoll®U 53 with Desmodur®Z XP 2589 (micronized IPDI trimer, deactivated 3 mol.% amine groups) in the process t is plooy activation at 120°C.
In latent-reactive film adhesives without catalyst (made from dispersion 1, the control sample) module save a few increases directly with the beginning of thermal activation. Under the same conditions latent-reactive film adhesives with lithium molybdate as a catalyst (made of dispersion 3, an example according to the invention) first does not show any changes of module preservation. The catalytic effect of lithium molybdate becomes visible only after about 50 C. the module Then save increases much faster than in the case of latent-reactive film adhesives without a catalytic Converter.
The reaction of the cross-linkage in made from compositions according to the invention latent-reactive coatings (preliminary), film, canvas or powders starts the supply of heat. Pre-coating, film, canvas or powder must be heated or to a temperature exceeding that of the testing of the polymer, or to a temperature exceeding the temperature plasticization Deaktivierung solid aliphatic isocyanate (melting temperature or glass transition temperature).
The application of the adhesive and the connection
Floor (preliminary), film adhesives, canvas or powder from the adhesive washes the VA can be applied, to apply or to sprinkle on the surface of one of the subject compound substrates (one-sided application) or to apply, to impose or to sprinkle on the surface both be joining substrates (duplex coating). This way of working (unilateral or bilateral application), optimized for use in a particular case depends, among other things, on the characteristics of wetting the surfaces of the substrate by a layer of adhesive substance, softened by thermoplastic mechanism under thermal activation; specialist in the art can determine it in the routine manner.
In principle, to create adhesive bonding possible in the following ways:
1. Transient thermal activation layer of adhesive and the start of the reaction cross-linking.
By briefly thermal activation, for example, in the heating channel by IR irradiation or microwave irradiation latent-reactive coating, latent-reactive film, latent-reactive canvas or latent-reactive powder is heated to a temperature in excess of such testing polymer or temperature plasticization solid isocyanate. Directly after this, carry out the connection surfaces of the substrates, creating pressure. In this case, short-term thermal activation only C is putting forth the reaction of cross-linking. Their final characteristics of the layer of adhesive with cross stitching appears after 1-5 days.
The advantage of this way of working is short phase connections and relatively low temperatures under thermal activation. It is of interest, in particular in those cases when it is necessary to glue the substrate temperature sensitive.
2. Long-term thermal activation until the final characteristics of adhesive joints.
Latent-reactive coating, latent-reactive film, latent-reactive canvas or latent-reactive powder are between be gluing substrates. The substrate is brought into contact in a long time creating pressure at temperatures higher than the temperature of the testing of the polymer or the temperature of the plasticizing solid isocyanate. This allows you to get the final characteristics of adhesive joints directly after the merge process.
The advantage of this way of working is that quickly reach the possibility of further processing of adhesive bonding or that directly after the merge process, you can spend quality control.
3. The combination of short-term thermal activation, for example, for the purpose of clamping parts and more a long the th thermal activation in order to complete cross-linking.
This method works best because it gives the possibility to connect the substrates to each other within a short process. The final cross stitching in this case occurs at the second stage, which can be separated from the first connection process both spatially and temporally.
- Dispersion of the polymer capable of reacting with isocyanate Dispercoll®U 53, dispersion of a polyurethane manufactured by Bayer MaterialScience AG, 51368 Leverkusen; solid content, about 40 wt.%; the polymer capable of reacting with isocyanate and consisting of a linear polyurethane chains based on a polyester of adipic acid and butanediol, using GDI (HDI), IPDI (IPDI) as the isocyanate component. After drying the dispersion and film cooling to 23°C is the crystallization of the polymer. Measurement methods of thermomechanical analysis show that at temperatures of at least+65°C polymer mainly decrystallization.
- Solid aliphatic isocyanate
Desmodur®Z XP 2589; micronized trimer of IPDI (IPDI); manufacturer: Bayer MaterialScience AG, 51368 Leverkusen; NCO group content: about 17%; the rate of particle size d50 of around 1.5 μm, a gas temperature of about 65°C.
- Deactivating Amin
Jeffamine®T 403; 3-functional palifermin, a molecular weight of about 450, will produce the ü: Huntsman Corp., Utah, USA.
Protective colloid Tamol®NN 4501 (45%solution in water); manufacturer: BASF AG, 67056 Ludwigshafen.
Thickener Borchigel®ALA; manufacturer: Borchers GmbH, D-40765 Monheim.
Non-ionic emulsifier Emulgator FD, manufacturer: Lanxess AG, Leverkusen.
Composition devoid of surface activity of the solid isocyanate (agents cross-linkage):
Test cases (crosslinking agents 1 and 2)
Deionized water, emulsifiers, deactivating Amin, thickener and solid isocyanate in 15 minutes stir paddle stirrer at 2000 rpm, forming a homogeneous suspension.
Examples according to the invention (agents knitting 3-6)
First dissolve the catalyst in deionized water. Then add emulsifiers, deactivating Amin, thickener and solid isocyanate and within 15 minutes, mix them up paddle stirrer at 2000 rpm, forming a homogeneous suspension.
To deactivate the solid isocyanate agents cross links 1 and 3 contain 3 mol.% amine groups relative to all the trimer IFDI (IPDI) of NCO groups. Deactivation of the trimer IFDI (IPDI) tracks 2, 4, 5 and 6 was performed using a 7 mol.% the amino groups on the available NCO groups of the trimer IFDI(IDI).
Polymer dispersion with particles devoid of surface activity t is ejogo isocyanate
In the reaction vessel is placed dispersion of the polymer. Stirring, add the composition is devoid of surface activity of solid isocyanates.
|The raw component||Role||parts by weight|
|Dispersion 1 (control)||Dispercoll®U 5||The dispersion polymer||100|
|The crosslinking agent 1||Suspension of the solid isocyanate||20|
|The raw component||Role||parts by weight|
|Variance 2 (control)||Dispercoll®U 53||The dispersion polymer||100|
|The crosslinking agent 2||Suspension of the solid isocyanate||20|
|Role||parts by weight|
|Dispersion 3||Dispercoll®U 53||The dispersion polymer||100|
|The crosslinking agent 3||Suspension of the solid isocyanate||20|
|The raw component||Role||parts by weight|
|Dispersion 4||Dispercoll®U 53||The dispersion polymer||100|
|The crosslinking agent 4||Suspension of the solid isocyanate||20|
|The raw component||Role||parts by weight|
|Variance 5||Dispercoll®U 53||The dispersion polymer||100|
|The crosslinking agent 5||Suspension of the solid isocyanate||20|
|The raw component||Role||parts by weight|
|Variance 6||Dispercoll®U 53||The dispersion polymer||100|
|The crosslinking agent 6||Suspension of the solid isocyanate||20|
Dispersions 1 and 2 are test cases without catalyst. Examples 3 to 6 are examples according to the invention.
Check the effect of catalysts on reaction ability of latent-reactive pre-coatings
Polymer dispersions of examples 1-6 caused by using the doctor blade, creating a coating thickness of 200 μm on the sample - boards of beech wood (size: 50 mm × 140 mm; thickness 4 mm) having a floor area of 50 mm × 110 mm, and was dried for 1 h at 23°C. after another 3 hours on the layer of adhesive has imposed a film of PVC (supplier - firm Benecke) and at temperatures of 80 and 100°C (temperature of the RA presses) was pressed under a pressure of 4 bar for 5, 10, 15, 30 and 60 minutes Directly after extracting glue from beech wood and PVC from the press samples were suspended in a heating Cabinet, heated to 80°C, and kept them at this temperature for 3 minutes Then plastic film has suspended shipments of 2.5 kg and thus create stress on the glue joint, conducting the experiment in the Department of film at an angle of 180°) for 5 min at 80°C.
The length of the plot, which for 5 min the length of the experiment was separated film (the length of the detachment), can be used as a measure of the cross-linkage reaction. The length of the detachment converted into mm/min the lower the value, the faster the reaction of the cross-linkage or the higher activity of the catalyst.
|The length of the detachment [mm/min]|
|Temperature press 80°C||Dispersion 1 (control)||Variance 2 (control)||Dispersion 3||Dispersion 4||Variance 5||Variance 6|
|The length of the detachment [mm/min]|
|The temperature of the press 100°C||Dispersion 1 (control)||Variance 2(control)||Dispersion 3||Dispersion 4||Variance 5||Variance 6|
Rating: Catalysts of lithium molybdate, zinc molybdate and orthovanadate lithium accelerate cross-linking of latent-reactive pre-coatings. At the temperature of extrusion 80°dispersion 3-6 according to the SNO invention seize after 30 minutes (control dispersion 1 and 2 not less than 60 min), and at a temperature of pressing 100°C - less than 10 min (control dispersion 1 and 2 - not less than 15 minutes).
(Note: figures of less than 5 mm/min, believe that the layer of adhesive was the reaction of cross-linking. The mark "-" means that in the future the measurements it makes no sense).
The effectiveness of the catalysts in latent-reactive powders of adhesives
Manufacturer latent-reactive powder:
Dispersion 2 (control) and 4 (according to the invention) for 24 h and kept in the freezer Cabinet at a temperature of -5°C. this polymer is dropped into the sediment in the form of large solid particles. The composition was heated to room temperature and filtering the separated precipitated precipitated polymer from the liquid ("serum"). Then the polymer was dried in a sparing mode and was ground in a jet mill with cooling to achieve a particle size d50, amounting to about 100 microns.
2.4 g of the powder evenly sprinkled on the flap blended fabrics (cotton/polyester) size of 14 cm × 24 cm (corresponding to about 70 g/m2). Then blended fabric of cotton and polyester for 2 minutes was pressed in a membrane press at a temperature of 80°C for polyester fabrics without coverage under a pressure of 1 bar. Gluing kept for 24 hours at normal climate (23°C, 50% Rel. VL.), and then was subjected to IP is itaniu long-term strength.
Test for long lasting durability
To test for long-term strength fabric glue first, not burdening them with additional mass, hung in the heating Cabinet with a temperature of 60°C and kept them at this temperature for 30 minutes Then to glue the connection hung load 50 g (experiment detachment angle of 180°) and left at a temperature of 60°C for another 30 minutes after a 30-minute period of the test determined the length of the detachment in mm, then every 30 min the temperature was raised at 10°C. the length of the detachment was determined after each temperature increase.
|The length of the detachment [mm/min] / temperature level|
|Temperature test||The powder of the variance 2 (control)||The powder dispersion 4 (according to the invention)|
Since the length of the detachment up to a temperature of 150°C is small, obviously accelerated the flow cross-linkage latent-reactive powder with lithium molybdate. Bonding with use of powder without lithium molybdate completely separated already at 100°C.
1. Aqueous compositions for bonding substrates, including
a) dispersed in water in polymers with groups capable of reacting with isocyanate, such as urethane group and urea group,
b) at least one dispersed solid aliphatic polyisocyanate, devoid of surface activity, temperature plasticization above or equal to 40°C,
c) one or more compounds of elements of the 5th and 6th groups (subgroups) of the periodic system of elements, in which frame the oxidation of this element is at least+4, and
d) optionally, other additives and auxiliary substances.
2. The composition according to claim 1, characterized in that the dispersed polymer comprises a polymer unit capable of crystallization.
3. The composition according to claim 1, characterized in that the dispersed polymer as polymer units capable of crystallization, includes able to crystallization flexible polyether segments.
4. The composition according to claim 1, characterized in that the particle size of solid aliphatic polyisocyanates is size d 50 of less than 100 microns.
5. The composition according to claim 1, characterized in that the particle size of solid aliphatic polyisocyanates is size d 50 of less than 2 microns.
6. The composition according to claim 1, characterized in that the solid aliphatic polyisocyanate is a trimer of isophorondiisocyanate (IPDI).
7. The composition according to claim 1, characterized in that as component (C) used at least one compound of the elements molybdenum and vanadium.
8. The composition according to claim 1, characterized in that as component (C) used at least one connection element molybdenum.
9. The composition according to claim 1, characterized in that as component (C) apply lithium molybdate.
10. The method of obtaining the composition according to one of claims 1 to 9, comprising mixing
dispersed in water, polymer with groups is mi, capable of reacting with the isocyanate component a), such as urethane group and urea group,
at least one dispersed solid aliphatic MDI devoid of surface activity, temperature plasticization above or equal to 40°C. as component (b),
component (C), and
if necessary, other additives and auxiliary substances as component d),
characterized in that as component (C) used one or more compounds of elements of the 5th and 6th groups (subgroups) of the periodic system of elements, in which the oxidation state of this element is at least +4.
11. The method according to claim 10, characterized in that the component (C) in the introduction is in the aqueous phase dispersed polymer (a).
12. The method according to claim 10, characterized in that the component (C) in the introduction is composed of solid aliphatic polyisocyanate (b).
13. The method according to claim 10, characterized in that the component (C) in the introduction is the part that includes other additives and auxiliary substances (d).
14. The method according to claim 10, characterized in that the component (C) in the introduction is in the aqueous phase composition comprising a dispersed polymer (a), devoid of surface activity of solid aliphatic MDI (b) and, if necessary, doba is OK and auxiliary substances.
15. A method of manufacturing a latent-reactive coatings of compositions according to one of claims 1 to 9, characterized in that the compositions are applied to the surface of the substrate and dried.
16. A method of manufacturing a latent-reactive film or canvas without carriers of the compositions according to one of claims 1 to 9, characterized in that the compositions are applied to the separating paper, dried, and separated from the separating paper.
17. A method of manufacturing a latent-reactive powders of the compositions according to one of claims 1 to 9, characterized in that the method known as such, provide the precipitation of solid components of the compositions and their separation, or get them by drying aqueous dispersions and, if necessary, then reduce the particles to the micron scale by a method known per se.
18. Application of the compositions according to one of claims 1 to 9 as adhesives for the manufacture of films and canvases without media or for the manufacture of adhesives in the form of powders.
SUBSTANCE: invention represents an emulsion, in which oligomers with terminal isocyanate groups are a dispersion medium, and a disperse phase is a solution or a dispersion produced as a result of mixing a lime solution with calcium hydroxide content of 10-70 wt % with glycerine in the amount of 1-250 wt parts per 100 wt parts of calcium hydroxide, besides, the disperse phase content in the composition makes 1-55 wt %.
EFFECT: development of a cheap and easy to apply composition, coatings from which have high adhesion to moist metal or concrete surfaces, have proper adhesion to concrete applied onto them, are hardened with specified speed at temperature from zero and above, inhibit processes of metal corrosion and have low elasticity module.
SUBSTANCE: invention relates to a coating composition containing a) polyacrylate polyol obtained via polymerisation of unsaturated olefin monomers, where at least 40 wt % of the monomers include straight or branched alk(en)yl or alk(en)ylene groups, having at least 4 carbon atoms; b) polyether polyol obtained via esterification of component links having functional groups which form an ester, where at least 30 wt % of component links include straight or branched alk(en)yl or alk(en)ylene groups with at least 4 carbon atoms per functional group, which forms an ester, where he polyether polyol has hydroxyl number higher than 280 mg KOH/g and hydroxyl functionality of at least 2, and c) isocyanate-functionalised cross-linking agent. The invention also relates to a set of parts for preparing the coating composition and a method of applying the coating composition. The coating composition can be used as a top coating layer in multilayer paint coats, in finishing or reworking automobiles or large vehicles.
EFFECT: coating has high hardness, scratch resistance, lustre, longevity and wear resistance, chemical resistance and UV radiation resistance.
15 cl, 6 tbl
FIELD: medicine, pharmaceutics.
SUBSTANCE: invention relates to coating composition, applied, for instance, as transparent coatings, base coatings, pigmented coating layers, used, prime coatings, etc. Composition contains polyisocyanate, polyol, metal-based catalyst for carrying out reaction of addition reaction between isocyanate groups and hydroxyl groups, thiol-functioning compound and carboxylic acid, carbonyl group of carboxylic acid being in connection with π-electronic system.
EFFECT: creation of novel coating composition, demonstrating presence of favourable property balance, namely, low level of volatile organic solvent content with operation viscosity, high rate of hardening and long viability, which results in obtaining coatings, which demonstrate good outlook characteristics, in particular, low liability to formation of pinholes, and good hardness.
14 cl, 2 tbl
SUBSTANCE: polyisocyanate contains biuret groups, has functionality on isocyanate groups of not less than 4 and not more than 10 and is obtained using a method which includes (A) reaction of a polyisocyanate adduct with a secondary monoamine of formula (R1)(R2)NH, with the ratio of the isocyanate equivalent to the amine equivalent ranging from approximately 4:1 to approximately 14:1 to introduce biuret groups into said polyisocyanate, and (B) reaction of the polyisocyanate containing biuret groups with a blocking reagent. The polyisocyanate adduct (a) is obtained from 1,6-hexamethylenediisocyanate, (b) has average functionality on isocyanate groups of not less than 2.5 and not more than 8, and (c) contains isocyanurate groups. The blocking reagent is selected from a group comprising phenol, cresol, amides, oximes, hydrazones, pyrazoles and phenols which are substituted with long aliphatic chains.
EFFECT: obtaining blocked polyisocyanates which combine relatively low viscosity and low molecular weight with high functionality on isocyanate groups and high reactivity relative to binders used in coatings, as well as which are stable during storage with respect to increase in viscosity and are virtually colourless, which is especially important for systems which form transparent coatings.
9 cl, 6 ex, 5 tbl
SUBSTANCE: aqueous polyurethane dispersion composition contains polyurethane with carbodiimide and/or carboxyl groups, and polyurethane dispersion adhesive which contains polyurethane with carbodiimide and/or carboxyl groups. The polyurethanes are polyester-polyurethane elastomers. The aqueous polyurethane dispersion composition and polyurethane dispersion adhesive also contain at least one carbodiimide which contains at least one carbodiimide group. The aqueous polyurethane dispersion composition and polyurethane dispersion adhesive react with each other through a polyaddition reaction when heated to 50°C or higher. A polymeric film having an undercoating is obtained by depositing and drying the single-component aqueous polyurethane dispersion composition on a polymeric film. A composite is obtained by reacting the polymeric film having an undercoating with a substrate on which polyurethane dispersion adhesive is deposited and dried. The composite can be produced industrially and can be especially used in interior finishing, preferably of a component built into a transportation vehicle or can be used in the furniture industry.
EFFECT: high reliability of the composition.
5 cl, 3 tbl
FIELD: chemistry of polymers.
SUBSTANCE: invention relates to aromatic polyurethane polyols used as components of priming compositions. Invention describes the priming composition comprising aromatic polyurethane polyol including product of reaction: (a) at least one diol component among number of α,β-diols, α,γ-diols and their mixtures; (b) at least one triisocyanate; (c) at least one diisocyanate wherein at least one isocyanate is aromatic one, and molecular mass or aromatic polyurethane polyol is 3000 Da, not above, and a cross-linking agent also. Prepared aromatic polyurethane polyol shows viscosity value by Brookfield at the level 8260 centipoises, OH-number 192.6 KOH/g and the dispersity (Mn/Mw) at the level 3.0. Priming compositions prepared by using indicated aromatic polyurethane polyol are useful in finishing large means of transportation, for example, trains, trucks, buses and airplanes, in particular, in vehicle body works. Also, invention relates methods for applying priming compositions on support comprising applying indicated compositions, and to a method for finishing car in repairs comprising applying the indicated priming composition.
EFFECT: improved and valuable properties of composition.
11 cl, 5 tbl, 12 ex
FIELD: chemical industry; methods of production of a thermosetting elastomers.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the methods of production of a thermosetting polyurethane elastomer and also to the elastomer produced according to the given method. The invention presents the method of production of the polyurethane elastomer having a total apparent density exceeding 150 kg/m3 and providing for an interaction of polyisocyanate and a reactive to isocyanate composition not necessarily at presence of water, according to which the reaction conduct at an isocyanate index of 85-120. At that the polyisocyanate component is composed of: al) 80-100 mass % of diphenylmethanediisocyanate containing at least 40 mass % of 4.4'- diphenylmethanediisocyanate and-or a derivative of the indicated diphenylmethanediisocyanate, which (the derivative) is a may be a liquid at the temperature of 25°C and has NCO value of no less than 20 mass % and a2) 20 mass % of the other polyisocyanate; the reactive to isocyanate composition b) consists of b1) 80-100 mass % of a simple polyol polyester having an average nominal functionality - 2-8, average reactive equivalent weight of 750-5000, an average molecular mass of 2000-12000, the share of oxyethylene - 60-90 mass % and the share of the primary hydroxyl groups of 70-100 mass % calculated for the total number of the primary and the secondary hydroxyl groups in polyol; b2) a reactive to isocyanate extender of the chain in such a quantity, that the ratio of the rigid block makes less than 0.45; and b3) - 20-0 mass % of one or more of other reactive to isocyanate composition excluding water. At that the amount of the polyol of 61) and the reactive to isocyanate composition 63) is calculated from the total amount of the indicated polyol 61) and the composition 63). The invention presents also description of the thermosetting elastomer produced according to the indicated method.
EFFECT: the invention ensures production of a thermosetting polyurethane elastomer.
10 cl, 2 ex
SUBSTANCE: invention relates to the chemistry of foamed polyurethanes, particularly a polyurethane system for making elastic articles, preferably for medical purposes, for example, orthopaedic articles, technical parameters of which have improved sanitary properties which meet their operating requirements. The present invention can also be used to make polyurethane bandages. The polyurethane system for making articles with improved sanitary properties contains compositions based on a polyol compound A, an isocyanate compound B and a mineral agent C, which is dispersed in polyol compound A. The isocyanate compound B used is prepolymers of methylene diphenyl diisocyanates MDI. The mineral agent C used is a mixture of bentonite nanopowders which are intercalated with silver ions Ag+ and cerium ions Ce3+.
EFFECT: improved sanitary properties of the obtained elastic articles, with regard to both inhibiting growth of microorganisms and reducing gas release of volatile toxic organic compounds.
9 cl, 2 dwg, 5 ex
FIELD: textile industry.
SUBSTANCE: fabric is of polyester or polyetheretherketone type. The fabric coating is produced by way of cross-linking anionic aliphatic dispersion with OH-number < 0.5 with hydrophilous aliphatic polyisocyanate, preferably, based on hexamethylenediisocyanate with NCO value 17-18. The fabric may be woven of already coated fibres or filament yarns. The coating is applied on the fabric by way of its contacting with a gluing compound containing a gluing substance activated to perform cross-linking when heated. Then the fabric is ironed at a temperature of 95-100°C. The fabric is pitched on structures at a surface temperature, with the seams and laps not heated over 100°C. The invention excludes the necessity of further application of coating on the fabric after application the coating which ensures application of a significantly less weight in the process of coating.
EFFECT: one eliminates application of any organic solvents in the gluing compounds providing for tension of oil varnishes, liquifiers, fillers or coloured oil varnishes and offers an environmentally safe method for application of coating on an aircraft.
9 cl, 3 ex
SUBSTANCE: method involves: (1) reacting a mixture of polyisocyanate and 5-30 wt % mono- or polyisocyanate with a hydrophobic group at 120-180°C in the presence of 0.5-5 wt % carbodiimide catalyst to form a polycarbodiimide containing isocyanate functional groups, with average number of carbodiimide functional groups equal to 1-10, in which the hydrophobic group is an alkyl containing 4-25 carbon atoms which, a fluorinated hydrocarbon, a silicon-containing hydrocarbon or an organosilicon polymer, (2) breaking and/or prolonging the chain from the polycarbodiimide containing isocyanate functional groups by adding a compound in amount of 0.1-1.0 equivalents with respect to content of isocyanate functional groups, where the said compound contains a hydrophilic group and one or more amine and/or hydroxyl functional group simultaneous or subsequent blocking of the remaining isocyanate functional group with a compound containing one or more amine and/or hydroxyl functional groups and, possibly, a hydrophobic group, where the hydrophobic group is an alkyl group containing 4-25 carbon atoms, a fluorinated hydrocarbon, a silicon-containing hydrocarbon or an organosilicon polymer, (3) dispersing the obtained compound in water, and (4) regulating pH of the formed dispersion to a value between 9 and 14 by adding to the obtained dispersion a hydroxide of an alkali metal or a buffer, where the buffer is effective at pH 9-14. The invention also relates to coating mixture containing polycarbodiimide dispersion prepared using the method described above, as well as a curable material obtained by applying said coating mixture onto a substrate.
EFFECT: meeting the requirement for low amount of hydrophilic material needed for dispersing polycarbodiimide, obtaining films or coatings which are less sensitive to water, more resistant to solvents and which have improved properties during attrition testing in wet state, and achieving high cross-link density of the polymer network.
21 cl, 38 ex, 5 tbl
FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to mixtures consisting of blocked polyisocyanates designated as hardening agents in monocomponent lacquers of hot drying and comprising: (a) blocked polyisocyanate based on 1,6-diisocyanate hexane; (b) blocked polyisocyanate based on cycloaliphatic diisocyanates chosen from group comprising 1-isocyanato-3,3,5-trimethyl-5-ixocyanatomethylcyclohexane, bis-(4-isocyanatocyclohexyl)methane, 2,6-bis-isocyanatonorbornane, 2,5-bis-isocyanatonorbornane, 1,4-bis-isocyanatomethylcyclohexane and their mixtures, and (c) 3,5-dimethylpyrazole as a single blocking agent of agent of polyisocyanates named in (a) and (b). Blocked polyisocyanates are taken in the weight ratio (a) : (b) = 1:(1.8-2.2). Using mixtures of blocked polyisocyanates provides preparing clear lacquers with good acid resistance, stability against scratching and thermal yellowing.
EFFECT: improved and valuable properties of agents.
1 cl, 6 ex
FIELD: protective coatings.
SUBSTANCE: invention relates to a method for applying onto wood substrate coating with increased resistance to effects of chemical products. Method comprises following stages: (i) addition, to aqueous polyatomic alcohol suspension, of composition based on isocyanate(s) and anionic surfactant having hydrophilic portion containing anionic group and lipophilic portion containing hydrocarbon radical, isocyanate(s)-based composition containing no more than 30% surfactant bound to isocyanate group, to form aqueous emulsion of isocyanate(s) and surfactant; (ii) applying resulting mixture onto wood surface of substrate; and (iii) aging to complete reaction of isocyanate(s) with polyatomic alcohol required to form polyurethane coating.
EFFECT: increased strength of coating (at a level of 90 units) and acquired resistance to a variety of chemical, cosmetic, and woof products according to corresponding standard.
18 cl, 4 dwg, 5 ex
FIELD: rocket technique, chemical technology.
SUBSTANCE: invention relates to a method for preparing a hardening agent for polyurethane compositions based on oligodiene rubbers. Invention describes a method for preparing a hardening agent for polyurethane compositions consisting of the following components, wt.-%: oligodiene urethane prepolymer, 80-91; 20% solution of triphenylmetane triisocyanate in dichloroethane, or 27% solution of triphenylmethane triisocyanate in ethyl acetate, 7-13, and, optionally, transformer oil, 0-10. The process is carried out in the range of temperatures 55-65°C, under residual pressure 1333 Pa for 6 h. Invention provides preparing polyurethane compositions possessing the rupture strength value at the level 38 kgf/cm2, relative elongation 350-600%, elasticity modulus at 50°C at the level 41 kgf/cm2 and adhesion strength to ballistic fuel 41 kgf/cm2. Proposed compositions are able to provide working ability of articles in the range of temperature from -50°C to +50°C.
EFFECT: improved preparing method.
2 tbl, 4 ex
SUBSTANCE: amine-initiated polyol, having average functionality higher than 3.0 and less than 4.0, is a product of interaction of at least one C2-C4alkylene oxide with an aminocyclohexane alkylamine initiating compound, wherein said polyol has a hydroxyl equivalent mass from 75 to 560. The initiating compound is represented by any of the structures or , where each of the R groups independently denotes a hydrogen atom or C1-C4alkyl, R1 denotes C1-C4alkyl, and m denotes a number from 1 to 8.
EFFECT: invention enables to obtain foam plastic with a good combination of low k-factor and short demoulding time.
9 cl, 1 tbl, 2 ex
FIELD: industrial chemistry.
SUBSTANCE: present invention refers to a pulverizable system based on polyurethane that is applicable for production of the bottom layer for polyurethane formed parts that contains a polyol component (A) and an isocyanate component (B) and does not contain amine catalysts. The polyol component (A) contains: (a1) at least one compound that goes into reaction with isocyanate, (a2) at least one agent that is able to prolong the reactive chain with at least two groups that are able to go into reaction with isocyanate; at least one group that is able to go into reaction with isocyanate is represented by a free primary group NH2-, and (a3) at least one metallic catalyst and (a4) if necessary, other additives. The invention also refers to the way of production of the polyurethane bottom layer for formed parts, to the bottom layer that is manufactured in such a way and to application of this bottom layer in production of seats, control panel, remote controls, pockets and boxes or parts of the internal or external automobile siding.
EFFECT: production of the bottom layer for formed parts from the polyurethane-based pulverizable system that is characterized by low emanation of low-boiling components and condensing components, improved mechanical properties, in particular by breaking strength rupture limit, extensibility and breaking strength tearing limit as well as a small amount of time necessary for extraction from the mould if compared with the residency in an opened position.
20 cl, 4 tbl
SUBSTANCE: composition contains polyurethane fluoropolymers obtained by reacting polyisocyanate with urethane diol, and additives. Urethane diol is a product of reacting a cyclic carbonate and a compound which contains an amino group and an additional group selected from amino groups and hydroxy groups. Results can be achieved at moderate/low viscosity when the composition is deposited on a substrate and at low temperature during deposition.
EFFECT: adhesive composition which is curable under the effect of moisture is characterised by improved open assembly time and high cohesion strength in uncured state.
13 cl, 12 ex, 2 tbl