SUBSTANCE: invention concerns quickly solidifying polyurethane-based polymer compositions with enhanced adhesion to metal surfaces and can be applied in production of protective coatings, sealing glues, mastics, particularly for sealing of perforated holes in paper-making machines. Composition includes polyfurite urethane forpolymer, liquid solidifier based on 3,3'-dichlor-4,4'-diaminodiphenylmethane and polyoxytetramethyleneglycol with molecular weight of 1000 at mol ratio of 0.95:0.1, aerosil, and additionally contains glycidylmetacrylate as adhesion additive, and can include di-(2-ethylhexyl)phthalate as plastifyer.
EFFECT: obtaining composition with high adhesion to metal surfaces and improved thixotropy without impairing high physical and mechanical characteristics level.
2 tbl, 6 ex
The invention relates to bathroomvanities polymer compositions based on polyurethane with high adhesion to metal surfaces and can be used for the manufacture of protective coatings, adhesives-sealants, mastics, in particular for sealing of perforated holes of the paper machines.
Known polyurethane composition used in repair work for sealing holes of the tanks of vehicles (SU 1581725 A1 from 09.10.87,, IPC C08L 75/08, SC 13/02 invention "Polyurethane composition").
The composition contains, by mass:
|Simple hydroxyl-containing polyester|
|with mol. weight of 400-2000||100,0|
|The methyl methacrylate||100,0-105,0|
Known composition possesses high strength and adhesion properties, but cannot be used to create coatings on vertical metal surfaces due to the low technological properties, thixotropy, viscosity of the material.
Closest to savla is my song composition and technical nature of a polyurethane composition according to patent RU 2237069 from 25.02.2003,, IPC C08L 75/04 invention "Polyurethane composition containing the following components:
|Polimorfny urethane prepolymer|
|Liquid hardener based|
|with a molecular weight of 1000|
|when a molar ratio of 0.7:0,2||Rest|
At sufficiently high values of strength parameters the disadvantage of this structure is the low level of adhesion to metal surfaces.
The technical problem to be solved in the framework of the present invention is to provide a polyurethane composition having high adhesion to metal surfaces, improved thixotropy while maintaining a high level of physical and mechanical characteristics.
The solution of the above problem is due to the fact that the polyurethane composition comprising polimorfny urethane prepolymer, liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethylene the Kohl with a molecular weight of 1000, Aerosil contains liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 at a molar ratio of 0.95:0,1, and additionally contains as adhesive additives - glycidylmethacrylate and probably contains as a plasticizer di(2-ethylhexyl)phthalate, in the following ratio between the components of the polyurethane composition, wt.%:
|Polimorfny urethane prepolymer SKU-PFL-100||73,09-69,36|
|Liquid hardener based|
|with a molecular weight of 1000|
|in a molar ratio of 0.95:0,1||Rest|
As part of the inventive polyurethane composition is used polimorfny urethane prepolymer, which is a product of the interaction of 1.0 mole of polyoxyethyleneglycol with a molecular weight of 1000 (polifonica) THE 6-02-646-81 and 2 moles of 2,4-toluylene diisocyanate (p is oduct T) (TO-38-95-90).
As the liquid hardener is used, the curing agent (crosslinking agent) on the basis of aromatic amine 3,3'-dichloro-4,4'-diaminodiphenylmethane (Diameter X) (TU 6-14-980-84) and polyoxyethyleneglycol with a molecular weight of 1000, taken in a molar ratio of 0.95:01.
As adhesive additives used glycidylmethacrylate (TU 6-02-1338-86).
As a thixotropic additive composition contains Aerosil grades a-300 GOST 14922-77 representing a pure silicon dioxide in the form of loose bluish-white powder.
As a plasticizer to provide the necessary level of "survivability" of the order of 15-20 minutes, sufficient for the application and allows one to drain the applied composition to a metal surface, use of di(2-ethylhexyl)phthalate (GOST 8728-88).
Manufacturing process of polyurethane composition consists of the following operations:
synthesis of prepolymer on the basis of 2,4-toluylene diisocyanate and polyoxyethyleneglycol with a molecular weight of 1000;
- cooking liquid hardener;
- preparation of a polyurethane composition;
the polymerization of the composition.
Synthesis of the prepolymer is carried out in a closed reactor synthesis at a temperature (65-70)°when vacuum pressure minus 0.09 MPa and operating the mixer.
Liquid hardener is prepared in a vessel heated when the permanent stirring until complete dissolution of Diamete X, while in preheated (40-45° (C) payforit with a molecular weight of 1000 at atmospheric pressure loaded weighed Diamete X and other additives.
Mixing the prepolymer and the liquid hardener is performed at a temperature (60-70)°C. the Polymerization of the composition is carried out at (15-35)°C for 18-24 hours.
The claimed range of ratios between the components are determined experimentally and are optimal from the point of view of structure formation of the polyurethane matrix, allowing the achievement of high complex physico-mechanical characteristics of the finished material.
This composition can be used both independently and as adhesive compositions for the base layer of polyurethane coating.
To increase the shelf life delivery to the customer in the form of two chemically inactive compounds (prepolymer and liquid hardener with additives), which separately can be stored for 12 months or more.
The technical essence of the present invention is illustrated by the following experimental data.
Table 1 presents the formulation of polyurethane compositions, and in table 2 - characteristics of the reaction mixtures and polyurethane elastomers obtained on their basis, in comparison with the prototype. For comparison, similar tests were carried out for the comp the positions of the prototype.
From table 1 and 2 shows that most of the physico-mechanical characteristics (hardness, tear resistance, tensile strength) the composition according to the invention is not inferior to the prototype, and the level of adhesion to metal even better than the known composition, i.e. the invention solves the task.
From the data presented in table 2, it is seen that the best adhesion and strength properties are achieved when the ratio between the components is within the claimed range.
The compositions of examples with 2,6 beyond the quantitative values of components have worse characteristics than the industrial design composition as example 6 does not provide the necessary level of strength characteristics, and example 2 shows a lower adhesion to metal and drains with vertical surfaces due to the low content of thixotropic additives.
Thus, when testing the inventive polyurethane composition based on polimorfnogo prepolymer is achieved the required level of protective properties (adhesion to metal, tear resistance, hardness) and are provided with improved technological properties required viscosity and thixotropy of the material.
|The content in the composition in % (mass fraction)|
|The components of the composition||1 (prototype)||Examples of specific performance|
|Polimorfny urethane prepolymer SKU-PFL-100||74,58-77,75||75,0||73,09||71,0||69,36||65,0|
|Liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol mol. the weight of 1000 when a molar ratio of 0.95:0,1||-||18||20,32||21,23||21,73||24,5|
|Liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol mol. the weight of 1000 when a molar ratio of 0.7:0,2||Resttd align="center"> -||-||-||-||-|
|The properties of the reaction mixtures and|
|The compositions of table 1, in examples|
|The viability of the reaction mixtures, min, at a temperature of 25°||-||25||20||18||15||-|
|Hardness shore a, used (GOST 263)||96||94||91||92||91||90|
|Tensile strength at break at a temperature of (23±2)°C, MPa (GOST 270-75)||43,2||33,1||35,7||36,2||28,8||21,8|
|Tear resistance, MPa (GOST 11529-86)||82||92||86||86||71||67|
|Adhesion to Me, MPa (GOST 209-75)||6,4||7,4||13,0||14,1||15,1||13,5|
|Thixotropy (the ability of the material does not drain from the ceiling, vertical and horizontal surfaces is TEI)||flows||does not flow|
Polyurethane composition comprising polimorfny urethane prepolymer SKU-PFL-100, liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000, Aerosil, characterized in that the composition contains a liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 at a molar ratio of 0.95:0,1, and additionally contains as adhesive additives - glycidylmethacrylate, and possibly as a plasticizer di(2-ethylhexyl)phthalate in the following ratio, wt.%:
|the prepolymer of the SSI-PFL-100||73,09-69,36|
|liquid hardener based on 3,3'-dichloro-4,4'-|
|polyoxyethyleneglycol with molecular|
|the weight of 1000 in a molar ratio of 0.95:0,1||rest|
SUBSTANCE: invention pertains to polyurethane resin, which is a product of a reaction between at least one diisocyanate and components, containing functional groups, which have capacity to react with isocyanates, with the following composition: (a) first group, which is formed by one or more polyester-polyols based on ethers, each of which has average molecular mass ranging from 400 to 12000 g/mol, (b) second group, formed by one or more poly hydroxilated resins, chosen from a defined group of resins, (c) optional third group, formed by one or more polyols, each of which has average molecular mass, equal to or less than 800 g/mol, which are also chosen from a defined group of polyols, and (d) at least one amine and a reaction chain-stopping agent. The ratio of equivalent masses of diisocyanate and components, containing functional groups, with capacity to react with isocyanates, is chosen such that, naturally all isocyanate groups of diisocyanate are present as a product of the reaction with one of the above mentioned functional groups, with capacity to react with isocyanates. The invention also relates to the method of obtaining the above mentioned polyurethane resin, to polyurethane resin obtained through such methods, to coating for plastic substrates, containing the proposed resin, as a polyolefin binding substance, to use of such a polyurethane resin as a film forming substance in printing ink for printing on plastic substrates, as well as to the method of obtaining a laminate, which has a layer obtained when printing an image, including stages (a)-(d), with use of coating from polyurethane resin, and to a laminate, obtained using such a method.
EFFECT: obtaining a coating from polyurethane resin, with good heat resistance and excellent initial adhesiveness.
SUBSTANCE: coating for application to worn surfaces comprising composition including at least one curable polyurethane and at least one chlorinated polyolefine which provides improved adhesion to a worn surface as compared to adhesion of a coating composition including the same at least one curable polyurethane but not including at least one chlorinated polyolefine. The method of refinishing a worn surface comprises application of a curable polyurethane top finishing coating that includes at least one chlorinated polyolefine to the worn surface, and curing the curable polyurethane top finishing coating, wherein, before application of the curable polyurethane top finishing coating, the worn surface is treated with a solvent without any mechanical scraping.
EFFECT: improved interlayer adhesion.
37 cl, 3 tblr
SUBSTANCE: scope of invention covers stabilized water dispersions of curing agent suitable for coating preparation. Dispersion dispersed in water contains the following components: A1) at least one organic polyisocyanate with isocyanate groups connected in aliphatic, cycloaliphatic, araliphatic and/or aromatic manner, A2) ionic or potentially ionic and/or non-ionic substance, A3) blocking agent, B) stabilizer containing a) at least one amine with structural element of common formula (I) without any hydrazide group, b) substance with formula (IV) .
EFFECT: resistance to thermal yellowing increases.
6 cl, 5 tbl, 11 ex
FIELD: technological processes.
SUBSTANCE: method of coating application onto non-polar base includes stages of applying primer that contains one or more non-polar polymers polyolefins with silane functional groups onto non-polar base, and then applying one or more layers of pigmented coating above the primer layer. The primer contains resin based on alkyl aromatics and non-polar polyolefin, which contains silane groups.
EFFECT: primer demonstrates proper adhesion on non-polar bases without reduction of chemical resistance.
14 cl, 1 tbl, 5 ex
FIELD: protecting covers.
SUBSTANCE: invention relates to dye-cover. Proposed dye-cover is prepared from composition comprising components taken in the following ratio, wt.-%: binding agent, 20-30; hollow microspheres, 10-30, and organic solvent, the balance. A binding agent is chosen from group comprising organosilicon resin, acrylic (co)polymer, polyurethane. Ceramic or glass hollow microspheres of size 20-150 mc are uses as hollow microspheres. The composition can comprise additionally titanium dioxide in the amount 2-5 wt.-% and antipyrene additive in the amount 5-25 wt.-%. Invention provides refractoriness, atmosphere resistance and exploitation period. The proposed dye-cover possesses heat-insulting, sound-insulating, waterproofing properties simultaneously and designated for protecting different equipment, pipelines, metallic, concrete, ferroconcrete, brick, wood and other building constructions for habitable, common knowledge and industrial buildings and constructions.
EFFECT: improved and valuable technical properties of dye-cover.
2 tbl, 9 ex
FIELD: compositions for coats.
SUBSTANCE: proposed composition includes heterocyclic silicon compound containing at least one alcohol-orthosilicate group and cross-linking agent interacting with hydroxylic groups. Proposed composition has low content of volatile organic solvents and is hardened at temperature of 5°C ; hardened composition contains no unreacted low-molecular blocking agents which are likely to evolve into surrounding atmosphere at hardening or during operation. Besides that, ratio of life to time to drying time is favorable. Proposed composition may be used for finishing and secondary finishing of automobiles and large transport facilities; it may be also used as an adhesive.
EFFECT: enhanced efficiency.
14 cl, 4 tbl
FIELD: thermo-setting heat-activated paint compositions, application of such composition on substrate.
SUBSTANCE: proposed composition contains at least one amorphous binder at Ts below 5C and/or at least one crystalline or semi-crystalline binder at melting point or interval of melting points below 150C, at least one epoxy resin, at least one polyamine including cyanamide groups, at least one blocked or latent catalyst in the amount of 0.5-5 mass-%; this catalyst is deblocked or activated at elevated temperature below hardening temperature of paint composition. Paint composition is characterized by Ts below 5C and viscosity below 2000 mPa·sec measured at temperature of 80C and shift rate of 10 c-1. The method of application of coat to substrate includes the following stages: first, paint composition is heated to temperature of application, then, composition is applied on substrate and paint thus applied is heated to temperature of its hardening till complete hardening. Paint composition is used for application onto mirror reverse surface, onto metal surface or onto substrate sensitive to heating. This composition forms thin anti-corrosive coat free from volatile organic compounds which may be used at temperature of application between 100 and 160C by employing the methods of application at low temperatures.
EFFECT: enhanced efficiency.
15 cl, 3 tbl, 9 ex
FIELD: chemical industry; other industries; production of the polymeric coatings on the substrates by the baking for cure.
SUBSTANCE: the invention is pertaining to the polymeric coatings produced on the substrates by the baking for cure. The technical result of the invention is development of the varnishes for the baking for cure, which are mainly detach the harmless products and make the solid coatings resistant to the action of the dissolvents. The invention presents the coatings produced on the substrates by the baking for cure of the mixture consisting of 1 mass share of styrene copolymer and the allyl alcohol treated with diisocynotams with the contents of the OH-group from 1 up to 10 %; 0.05-1 mass share of the oxalic acid; 0.2-5 mass share of the organic solvents and, if necessary, of pigments and the auxiliary components for the varnishes, at the temperatures from 120°С up to 250°С and durations of the baking for cure from 1 up to 200 minutes. The produced coatings have the high hardness and positive stability to the action of the dissolvents. At that during the baking for cure only the dissolvent and water are separated.
EFFECT: the invention ensures development of the varnishes for the baking for cure, which are mainly detach the harmless products and make the solid coatings resistant to the action of the dissolvents.
1 cl, 5 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to moisture-hardenable polyurethane compositions, namely to those containing at least one polyurethane prepolymer with isocyanate groups obtained from at least one polyisocyanate and at least one polyol. In addition to prepolymer, composition further contains at least one polyaldimine prepared from at least one polyamine with primary aliphatic amino groups and at least one aldehyde of general formula: wherein Y1 and Y2, independently from each other, represent alkyl, aryl, or arylalkyl group, which is optionally substituted, may contains heteroatoms and/or unsaturated fragments, or Y1 and Y2 together form carbocyclic or heterocyclic ring, which is composed of 5-8, preferably 6 atoms and optionally contains one or two unsaturated bonds; and R1 represents either linear or branched C11-C30-alkyl chain, optionally with at least one heteroatom, especially with at least one ether oxygen atom, or linear or branched C11-C30-alkyl chain with one or numerous unsaturated bonds, or R1 represents group or in which R2 represents linear, branched, or cyclic hydrocarbon chain with 2-16 carbon atoms, optionally incorporating at least one heteroatom, especially at least one ether oxygen atom, or linear, branched, or cyclic C2-C16-hydrocarbon chain with one or numerous unsaturated bonds; and R3 represents linear, branched, or cyclic hydrocarbon chain with 1-8 carbon atoms. Invention describes methods for preparing such compositions and polyaldimine. Compositions can be used as glues, sealing formulations, coatings, or floorings hardening without unpleasant smell and suitable to seal layers inside buildings or to join structural members in vehicle interiors.
EFFECT: extended assortment of hardenable liquid polymer compositions.
24 cl, 4 tbl, 14 ex
FIELD: building materials.
SUBSTANCE: invention relates to a hardening composition used in building industry. The composition comprising a polymer with two or more thiol groups per a molecule, compound with two or more isocyanate groups per a molecule, carbon black and calcium carbonate involves additionally a filling agent wherein silicic acid or silicate is the main component or organic filling agent wherein ground powdered carbon as the main component. The composition shows satisfactory stability in storing the basic compound and the hardening capacity even after storing the basic compound and, except for, it forms the hardened join with sufficient rupture strength limit, hardness and properties of barrier for gas. The composition comprises a hydrocarbon plasticizer and an organometallic compound preferably that provides highly effective hardening properties in combination with higher mechanical strength and properties of barrier for gas. Proposed hardening composition can be used as sealing material in manufacturing isolating glasses, frames, windows for transportation means, glues and covers.
EFFECT: improved and valuable technical properties of composition.
9 cl, 12 tbl, 11 ex
SUBSTANCE: invention relates to hermetising polymeric composition, which is applied in machine-building and construction. The said composition includes with definite ratio of components: forpolymer, simple oligoether, filler and wastes of elastic foampolyurethane; as forpolymer it contains forpolymer based on polyoxitetramethilenglycol and toluilendiisocyanate, as simple oligoether - simple oligoether based on glycerol, propylene oxide and ethylene oxide of molecular weight 3600, and additionally contains polyisocyanate type B, tiodiethylene glycol and tin octoate. The composition contains definite composition of components, as a result of which breaking strength of hermetics based on such composition increases 2-3 times and remanent elongation reduces 4-6 times.
EFFECT: increase of breaking strength and reduction of remanent elongation of hermetics.
1 tbl, 11 ex
SUBSTANCE: invention relates to chemistry of polymers, namely, to compositions for obtaining rigid foampolyurethane, used as heat-insulating materials in different fields of technology, in particular for multi-layer building boards with intermediate layer of foampolyurethane. Composition for obtaining rigid foampolyurethane includes simple low-molecular and high-molecular polyethers, polyol, surface-active substance, nitrogen-containing and alkali catalysts, foaming agents, inhibitors of burning and polyisocyanate, which differs by the following: inhibitor of burning is a mixture of tris-(2-chloroethane)-phosphate and calcium tartrate or magnesium sulphide in ratio 1:0.05-0.2 with the following ratio of ingredients, mass fraction: polyether with MW 300-800 50.0-75.0; polyether with MW 3000-6000 1.5-7.5; polyol 3.0-10.0; surface-active substance 1.0-2.0; dimethylethanolamine 0.5-3.0; foaming agents 3.0-10.0; alkaline catalyst 0.05-0.5; inhibitor of burning 20-28; polyisocyanate 150. Use of tris-(2-chloroethane)-phosphate and calcium tartrate or magnesium sulphide in composition as inhibitor of burning results in reduction of amount of inhibitor of burning used in composition, stabilisation of foam formation and increase of strength indices of rigid foampolyurethane.
EFFECT: reduction of amount of inhibitor of burning used in composition for obtaining rigid foampolyurethane, stabilisation of foam formation and increase of strength indices of rigid foampolyurethane.
1 tbl, 1 cl
SUBSTANCE: invention pertains to the method of speeding up solidification of single-component foamed polyurethanes for prolonged storage, used when extruding onto a surface. The proposed method involves putting ethyleneglycol into a container containing foamed polyurethane ready for use, in ratio of 35-50 ml for 750-1000 ml of the foamed polyurethane in the container. The mixture is stirred for several times and then sprayed on to a prepared surface.
EFFECT: given method provides for speeding up solidification of single-component foamed polyurethanes, foamed polyurethanes, solidified using the proposed method, are used on adhesive surfaces.
2 cl, 1 ex
FIELD: manufacture of frost-resistant polyurethane composition.
SUBSTANCE: proposed composition contains the following components, mass-%: polyurethane prepolymer on base of 2,4-toluylene diisocyanate and poly-tetramethylene oxide diol at molecular mass of 1000 (100), hardening agent - 3,3'-dichloro-4,4'-diaminodiphenyl methane, (5-7); involatile solvent-hardening agent containing plasticizing agent 2,6- diethylhexyl sebacate, (39-41); polytetramethylene oxide diol at molecular mass of 1000, (20-24) and polyoxy propylene diol at molecular mass of 1050, (22-27). Proposed composition has modulus (nominal stress at 100-% deformation) not exceeding 1.6 Mpa at room temperature and not exceeding 3.0 Mpa at temperature of minus 50°C at tensile strength no less than 15 Mpa within temperature range of from 20 to minus 50°C and parting strength no less than 30 kN/m at temperature of 20°C.
EFFECT: enhanced efficiency.
1 tbl, 10 ex
FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to polyurethane foam/polyisocyanurate strengthened by glass fibers and a method for their synthesis. Method involves the following steps: (1) contacting isocyanate component of viscosity in the range from 200 to 600 mPa x s, component based on polyhydric alcohol comprising the first polyhydric alcohol and representing derivative of sorbitol, the second polyhydric alcohol of a simple polyether type and the third polyhydric alcohol of polyester type. Abovementioned polyhydric alcohols show viscosity in the range from 200 to 600 mPa x s, and reaction is carried out in the presence of catalysts chosen from tin salts, potassium carboxylates and in the known cases tertiary amines, physical and/or chemical swelling agent, emulsifier and, if necessary, a flame retardant agent; (2) impregnation with a composition prepared at step (1), package of glass fibers, and (3) foaming and hardening abovementioned composition to form strengthened foam-block containing glass fibers package. Prepared strengthened foam-block shows mean density in the range from 115 to 135 kg/m3 but from 120 to 130 kg/m3 preferably, above about 130 kg/m3, and isocyanate number in the range from 100 to 180 but from 130 to 180 preferably. Also, invention describes a method for synthesis of polyurethane foam/polyisocyanurate for transporting liquefied gas, in particular, tanks for transport of liquefied methane.
EFFECT: improved method of synthesis.
4 cl, 6 tbl
FIELD: petrochemical processes.
SUBSTANCE: invention relates to a method for production of bitumen-polyurethane compositions designed mainly for manufacturing road, protective, insulation, and anticorrosive coatings. Modification of bitumen comprises interaction of bitumen bulk with prepolymer preliminarily prepared from components containing polyol and isocyanate groups, interaction being carried out at 60-140°C for 0.25-1 h, said components with polyol groups being polyethers and groups of polyuoxypropylene glycols and polyethylene(butylene) glycol adipates with functionality at least 2, whereas components with isocyanate groups are 2,4-tolylene diisocyanate, provided that molar ratio OH/NCO is 1:2 and amount of prepolymer corresponds to 1-10 wt % of the weight of bitumen.
EFFECT: achieved production of material with lowered brittleness temperature and water absorption, raised softening temperature, increased adhesion and elongation strength, and enhanced corrosion resistance.
2 tbl, 28 ex
FIELD: polymer production.
SUBSTANCE: liquid hardener for prepolymers with terminal isocyanate groups, used in molding-mediated manufacture of polyurethane elastomer products, is composed of, wt parts: 3,3'-dichloro-4.4'-diaminodiphenylmethane 3.2-13.2, polyetherpolyol having molecular weight 1000-2000 (as nonvolatile solvent) 84.8-95.9, N.N'-tetraoxypropylenediamine having molecular weight 290 - 0.7-2.9.
EFFECT: enabled manufacture of molded polyurethane elastomers with reduced rigidity level and high strength characteristics level.
FIELD: polymer materials.
SUBSTANCE: invention relates to formulations of polyurethane elastomers, which can be used for manufacturing articles involving molding techniques. Composition of invention contains, wt parts: urethane prepolymers based on 2,4-tolylene diisocyanate and polytetramethylene oxide diol having molecular weight 1400, 100, and those based on 2,4-tolylene diisocyanate and oligobutadienediol having molecular weight 2000, 120-160; curing agent: 3,3'-dichloro-4,4'-diaminodiphenylmethane, 7-9; and nonvolatile solvent-hardener consisting of 2,6-diethylhexyl sebacate, 35-45, and polytetramethylene oxide diol having molecular weight 1000, 70-80. In this way, high-strength cross-linked elastomers are prepared with modulus value 1.2-1.6 MPa at ambient temperature and with modulus value no higher than 3 MPa within a temperature range up to -50°C, while retaining strength at least 15 MPa.
EFFECT: increased frost resistance of articles and enabled operations with such articles under low-temperature conditions.
1 tbl, 11 ex
FIELD: building materials industry; methods of production of the compacted building materials containing the polyurethane elastomer and the caoutchouc.
SUBSTANCE: the invention is pertaining to the compacted building material containing the polyurethane elastomer and the caoutchouc and to the method of production of the material. The method of production of the material includes mixing, forming and compaction of the source materials and may be used at the construction, decorative and engineering works. The material includes the mixture of the polyurethane elastomer formed in situ by the reaction of the polyurethane prepolymer having the end isocyanate groups with the polyol, and caoutchouc. The caoutchouc is selected from the group including the natural rubber, the synthetic rubber, the initial either reused caoutchouc or their mixture. The polyurethane elastomer is taken in the amount from 5 up to 40 mass %. The compacted material contains, if necessary, one or several additives. The material produced under the invention possesses the good mechanical properties and, possibly, has the fire-resistance, the electrical insulation, the water-isolation and the aesthetic properties.
EFFECT: the invention ensures production of the compacted material with the good mechanical properties, and, possibly, with the fire-resistance, the electrical insulation, the water-isolation and the aesthetic properties.
28 cl, 4 ex
FIELD: petrochemical processes.
SUBSTANCE: bitumen modification process accomplished by introducing polymer additive into bitumen is characterized by that, before introduction of polymer additive, isocyanate component selected from 2,4-tolylenesiisocyanate and polydiisocyanate is added to bitumen to form active isocyanate groups therein and two-component mixture resulting therefrom is then aged, while polymer additive utilized is selected from functionalized polyesters and polyethers, in particular from polyethylene-butylene glycol adipate, polyoxypropylenediol, and polyoxypropylenetriol, which interact with active isocyanate groups present in bitumen to form polyurethane composition with bitumen/polyurethane ratio (95-67):(5-33).
EFFECT: improved physicochemical characteristics of bitumen-polyurethane composition.
2 tbl, 3 ex
SUBSTANCE: invention concerns rubber compound and pneumatic tire, tread of which is made of this rubber compound. Rubber compound includes from 15 till 100 weight fractions of sol chain silicon dioxide, dispersed in isopropanol, possessing average aspect ratio L1/D between branched particles A-A, containing branched particles A in the range of from 3 till 30, from 1 till 20 weight fractions of silaned bonding agent for 100 weight fractions of rubber component, containing diene rubber, vulcanising agent, such as sulphur, and vulcanisation accelerator, where L1 corresponds average distance between branched particles A-A, containing branched particles A, and D corresponds effective diameter of primary particle. At that mentioned particle A corresponds particle, which is contacted at least by three other particles.
EFFECT: improvement of adhesion characteristic with wet and dry road surface at holding of rolling resistance characteristic.
3 cl, 2 dwg, 2 tbl, 2 ex