Method of imparting increased chemical resistance to wood substrate

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

 

The invention relates to a method of applying on a wooden base or a base with a wooden surface with high resistance to chemical products.

In particular, the invention relates to a method of coating with the above properties on wooden surfaces, interiors, whether personal or public use, namely parquet floors, doors, walls, baseboards, furniture or interior decoration of the car.

Wooden surfaces are exposed to many chemical agents and are protected by the application of the dye or lacquer coating.

Of chemicals that worsen the appearance of wooden surfaces interior, you can specify, in particular, such products as detergents for cleaning surfaces, as well as fatty substances and certain foods such as coffee, mustard, vinegar, milk and wine, particularly red.

Of fatty substances that worsen the appearance of wooden surfaces, can be called, in particular, cosmetic creams and sunscreens, after which, as a rule, accidental contact with the wooden surface to leave her marks, spots, stains, which are very difficult to remove, including in cases when these surfaces have a protective coating, such as varnish is first.

In order to protect wooden surfaces, they are covered, as is well known, paints or varnishes polyurethane type.

Such coatings are produced by applying on a protected surface composition containing a polyhydric alcohol (polyol and isocyanate curing agent, isocyanate functional groups which react with hydroxyl functional groups of the polyhydric alcohol to form a polyurethane mesh.

Due to the temperature sensitivity of wood coatings dried at ambient temperature, sometimes at a higher, but not exceeding 60°With the temperature.

For this purpose it is necessary to apply the so-called "system 2", consisting of two components, of which the first component is a polymeric polyhydric alcohol, and the second isocyanate.

Both components are mixed with each other directly before application of the composition to prevent the formation of the grid prior to coating.

Polyhydric alcohol and a hardener can be used in the form of a solution, suspension or emulsion.

In connection with the amendment of the legislation concerning the use of volatile organic solvents, in particular for domestic purposes, and in connection with measures for the protection of the environment currently, there is a trend towards the rejection of the use of organic the ski solvents and application for applying to the treated surface water emulsions, containing polyhydric alcohol with the introduction of hardener before use.

One of the main difficulties when using the emulsion according to the invention, is the difficulty of manually adding the hardener in water emulsion based on a polyhydric alcohol due to differences in the viscosity of the isocyanate composition and a polyhydric alcohol.

Indeed, for the coating on the surface of domestic use, the user mixes the isocyanate and a polyhydric alcohol before use, usually manually, without using a mechanical mixing device.

Due to the hydrophobicity of the isocyanate is usually to give hydrophilic properties or use special equipment that produces intense agitation for the introduction of hydrophobic isocyanate component in the aqueous phase.

Another solution is the modified (poly)isocyanate to give it hydrophilicity and, therefore, the ability to dispersion or emulsion in water.

In the patent US 5252696 proposed for this purpose to enter in the polyisocyanate to hydroxyl polyester group by reaction between a hydroxyl group of the polyester and the functional group NCO MDI.

However, coatings made with the use of aqueous emulsions of a polyhydric alcohol and isocyanate(s), have, as is ravelo, only mediocre resistance, which is insufficient when exposed to chemical products.

The present invention is to develop a way of drawing on the canvas with a wooden surface coating of polyurethane type using compositions based on blocked or poorly blocked isocyanate(s), acting as hardeners, which can easily be entered in aqueous emulsion of a polyhydric alcohol, in particular, manually.

The aim of the invention is, in particular, development of a method of applying a composition based on isocyanate(s), which can easily be entered in aqueous emulsion of a polyhydric alcohol without the need of reducing the viscosity of the composition based on isocyanate(s) by the introduction of significant quantities of organic solvent.

Another aim of the invention is to develop a method using a composition based on hidden or poorly hidden isocyanate(s), which after its introduction in aqueous emulsion of a polyhydric alcohol and drawing on the canvas with a wooden surface allows to obtain a coating with high hardness.

Another aim of the invention is to develop a method using a composition on the basis of the isocyanate(s) of the type specified above, which provides excellent appearance of the surface.

The purpose and the gain is also developing a method of using a composition based on the isocyanate(s), for increased resistance to chemical products.

In WO 97/31960 described based composition dispersible in the aqueous phase of the isocyanate, which is effective when applied paint or varnish.

This publication reports on the application of the specified type isocyanate coating on the steel plate in the form of a polyurethane film.

As a rule, the scope for the hardeners of this type are coatings for automobile bodies or external steel structures such as bridges, building metal woods and other

Research conducted by the authors of the present invention revealed that the isocyanate compositions, such as described in WO/97/31960, being deposited on the surface of wood, unexpectedly lead to excellent results, in particular, provide increased hardness and resistance to chemical products.

The invention concerns a method of applying on the basis of the wooden surface coatings with improved properties in terms of hardness and resistance to chemical products, characterized in that it comprises the following stages:

a) adding to the aqueous slurry a polyhydric alcohol composition based on isocyanate(s) and anionic surfactants (surfactant)containing gerofi is inuu part with an anionic group and a lipophilic part with a hydrocarbon radical, such surfactants also contains a fragment of the chain polyethylene and/or polypropyleneglycol at least 1, preferably at least 5, mostly, at least 7 ethyleneoxy and/or propionyloxy links, while the composition on the basis of the isocyanate(s) contains no more than 30 wt.% Surfactant associated with the isocyanate functional group, for the formation of emulsions of the isocyanate(s) and a polyhydric alcohol in water;

b) applying the mixture on a wooden surface specified basis;

c) aging the reaction of the isocyanate(s) with the polyhydric alcohol for the formation of polyurethane.

Surfactants may be present in the composition based on a polyhydric alcohol, a composition based on the isocyanate(s) or may be added in aqueous suspension of a polyhydric alcohol simultaneously with the isocyanate composition.

However, it is preferable that the surfactant is present in the composition based on isocyanate(s).

It is preferable to choose a surfactant so that it did not contain a functional group reactive (poly)isocyanate, and was present in the slurry is essentially free-form, and not in the form that is connected by a chemical bond with the (poly)isocyanate.

By "essentially free-form" means that less than 30 wt.%, mostly less than 20 wt.%, preferably less than 10 wt.% What AV are in bound form.

According to a preferred variant of the invention, the anionic surfactant contains at least one functional group selected from sulfates or phosphates and aryl(s) and/or alkyl(s), aryl - or alkylphosphonates - Phosphinates and sulfonates.

Preferably, anionic surfactants contain hydrophilic portion formed anionic functional group, the fragment chain glycol and/or polypropyleneglycol and lipophilic part, formed by a hydrocarbon radical.

The lipophilic portion is formed preferably alkyl and aryl radicals preferably 6-30 carbon atoms.

Most preferred is an anionic surfactant corresponding to the formula:

where q is 0 or 1; R indicates an integer equal to 1 or 2; m is zero or an integer equal to 1 or 2; X and X', equal or different, are a chain with no more than two carbon atoms; s is zero or an integer selected from the range from 1 to 30, mostly ranging from 5 to 25, preferably from a range from 9 to 20; n is zero or an integer selected from the range from 1 to 30, mainly from the interval 5-25, preferably the interval 9-20; E represents a phosphorus or sulfur; R1and R2identical or different, denote a hydrocarbon RA is hiccuping, selected mainly from optionally substituted C6-C30aryl or optionally substituted C1-C20alkyl, preferably optionally substituted C10-C20Akilov.

Although it is not part of the preferred compounds, however, it should be noted that s and/or n can be 0, provided that E means phosphorus and that in the case when s and n 0, respectively, R1and/or R2are preferably branched alkilani with 8-12 carbon atoms, or aracelli with 12-16 carbon atoms, or alkylaryl with 10-14 carbon atoms.

One of the divalent radicals X and X' can also be a radical of the type ([EOm(O-)R]), are capable of forming pyrolysate, such as a complex symmetric or asymmetric diesters of phosphoric acid.

The total number of carbon atoms in the anionic compounds according to the present invention is mainly not more than about 100, preferably not more than 50.

Divalent radicals X and optionally X' are selected mainly from the following bivalent radicals (left part of the formula refers to E):

when E mean R, one of the divalent radicals X or X' may be O-P(O)(O)-X";

when E mean R, one of the divalent radicals X or X' may be-O-(R10-OP)(O)-X, where R 10means a hydrocarbon residue with 2 to 30 carbon atoms containing one or more ethyleneoxy or propionyloxy links, mostly at least 5, preferably at least 7, and X represents an oxygen atom or a simple bond;

direct connection between E and the first mentioned ethylene fragment chain glycol;

- optionally substituted methylene, and in this case preferably partially endowed functionality;

- structural chain-Y-, -D-Y-, -Y-D-, -Y-D-Y', where

→ Y and Y', equal or different, denote a chalcogen selected mainly from the most light elements, namely sulfur and, mainly, oxygen, and metalloids that are closest to the chalcogen phosphorus, and related to the column VB in the form of derivatives amine or tertiary phosphine, tertiary radical is predominantly radical containing not more than 4 carbon atoms, preferably not more than 2 carbon atoms;

→ D means alkylene, optionally substituted and endowed with functionality, while D is predominantly ethylene or methylene, preferably ethylene in structures-D-Y - and mainly in the structures of the-Y-D-Y', and methylene structures-Y-D-.

In the case where E means the phosphorus formula (I) takes the form of formula (II):

that when q is 0, has the form:

where p denotes 0 or an integer equal to 1 or 2;

- m means 0 or an integer equal to 1 or 2;

the sum p+m+q is equal to three or less;

- sum 1+p+2m+q is equal to three or four;

X and X', equal or different, denote a chain containing not more than two carbon atoms;

- n means an integer selected from the range from 5 to 30, mostly ranging from 5 to 25, preferably from a range from 9 to 20;

- R1and R2identical or different, denote a hydrocarbon radical selected mainly from arrow and Akilov, such as described above, optionally substituted, in particular, a halogen atom, preferably a fluorine atom.

In the above formulas ethylenoxide can be partially replaced by propylenoxide. However, it is desirable that the compounds contained mostly ethylenoxide.

In the description of this application used the periodic system of the elements, see the Supplement to the Bulletin of the Chemical society of France in January 1966, No. 1.

The required functionality of alkylene and, in particular, metileno (X, X') has been provided with hydrophilic functional groups (tertiary amines and other anionic functional groups, including with those which were described above [EOm(O-)p]).

Proteotion is selected from inorganic cations, metal cations or organic cations.

Preferably, proteotion was monovalent and is selected from inorganic cations or organic, preferably not nucleophilic cations of Quaternary or tertiary type, in particular, with the ending of "one" from the fifth column, such as phosphonium, ammonium, or from the sixth column, such as sulfone, etc. or mixtures thereof. Preferred are protivootecona type ammonium formed by an amine, preferably a tertiary. In addition, it is preferable to exclude the case when the organic cation contains a hydrogen atom that reacts with the isocyanate functional group.

Inorganic cations can be chelated agents, phase transfer, such as crown-ethers.

The pH of organic or inorganic cations equal mostly 8-12.

Cations and, in particular, amines corresponding to the cations ammonium, do not possess surface-active properties, but it is desirable that they have a good solubility in any case sufficient to ensure the solubility of these compounds containing anionic functional group, and preferably a fragment pole yanglicheva circuit, in the aqueous phase, ensuring a working concentration. Preferred are tertiary amines containing not more than 12 carbon atoms, mostly not more than 10 carbon atoms, preferably not more than 8 carbon atoms per functional group, ending with "one". Amines can contain other functional groups, in particular those that correspond to functional groups of amino acids and cyclic ether, such as N-methylmorpholine, or not relevant to them. Other functional groups are present mainly in the form in which they do not react with isocyanate functional groups and no significant deterioration in the solubility in the aqueous phase.

The preferred amine is triethylamine.

Most preferably, the anionic compounds according to the invention, is present in the neutral form, i.e. to a pH in the dissolution and contact with water was at least 3, preferably 4, preferably 5, but not more than 12, mainly 11, preferably 10.

If E denotes the phosphorus, it is desirable to apply a complex mixture of mono - and diapir in a molar ratio of from 1/10 to 10, mostly from 1/4 to 4. Such mixtures may additionally contain phosphoric acid in an amount of from 1 to about 20 wt.%, but the pre is respectfully - not more than 10 wt.%, and 0-5 wt.% esters pyrophosphoric acid. Preferably, the phosphoric acid was transferred, at least partially in salt so as to ensure the specified pH ranges. In complex mono - and diesters part of ethylenoxide may be replaced by propylenoxide. However, it is preferable that ethylenoxide was present in the majority.

(Poly)isocyanate, according to the invention may be any isocyanate and a (poly)isocyanate. Preferred (poly)isocyanates are selected from the products of Homo - or heterocedasticity of alkylenediamines containing, in particular, products of the type "biuret", "trimers" and even "prepolymers" with isocyanate containing, in particular, urea, urethane, allophanate, amide, functional groups, and mixtures thereof.

Can be used, for example, polyisocyanates produced by the company RHODIA, France, under the name "TOLONATE".

Generally, the preferred polyisocyanates are the products of Homo - or heterocercal the following Monomeric isocyanates:

- 1,6-hexamethylenediisocyanate,

- 1,12-dodecanesulfonate,

- CYCLOBUTANE-1,3-diisocyanate,

- cyclohexane-1,3 and/or 1,4-diisocyanate,

- 1-isocyanate-3,3,5-trimethyl-5-diisocyanatohexane, (isophorone-diisocyanate), IPDI,

- 2,4 and/or 2,6-hexahydrotriazine,

- hexahydro who -1,3 - and/or 1,4-delete the entry,

- perhydro-2,4'- and/or 4,4'-diphenylmethanediisocyanate,

- 1,3 - and/or 1,4-delete the entry,

- 2,4 - and/or 2,6-toluylenediisocyanate,

- difenilmetana-2,4'- and/or 4,4'-diisocyanate,

- isocyanates-(4)-methyloctane, diisocyanate (LTI or NTI),

- triphenylmethane-4,4',4"-triisocyanate,

- 1,3-bis-socialecological,

bis-isocyanatobenzene (NBDI),

- 2-methylphenothiazine.

In the isocyanate composition with a surfactant is not necessary to add an organic solvent.

However, to reduce the viscosity of the composition or to improve the optical properties of the film may be added a certain amount of organic solvent.

However, it is preferable that the composition does not contain more than 50 wt.%, mostly not more than 40 wt.%, preferably not more than 35 wt.% organic solvent from the total weight of the isocyanates, depending on the type of polyhydric alcohol to which is added the composition.

From suitable solvents can be specified on methoxypropylacetate, butyl acetate, propylenglycol produced, for example, under the name of PROGLYDE DMM® de Dow, or ketones, propilenglikolstearat, ethyl-3-ethoxypropionate, butylethylmagnesium.

The mass ratio between the isocyanates and anionic surfactants is usually not more than 1/3, mostly not more than 0%, preferably 10%.

The mass ratio between the isocyanates and the surfactant is predominantly more than 1%, preferably 2%.

It is also desirable that the number of specified or selected PAHs ranged from 10-2to 1, mainly from 5·10-2to 0.5 atom E in 1 liter

Thus, the mass ratio between the isocyanates and the surfactant is predominantly at least 2%, preferably 4%, but not more than about 20%, preferably about 10%, therefore, the mass ratio is mainly from 2 to about 20%, preferably from 4 to about 10%.

According to the present invention mentioned surfactants can be used alone or in a mixture with one or more other surfactants. The latter can be substances that meet the above requirement to the content of the anionic functional group and predominantly fragment chain glycol in the amount of preferably not less than 5 ethyleneoxide.

These surfactants may also be selected from other ionic compounds or non-ionic blocked at the end of the chain compounds. However, it appears that non-ionic compounds containing the functional alcohol groups, affect the emulsification of minor adverse effects, even if they put the part affect other properties of the paint composition; taking this into consideration, it is preferable that the content of compounds of this type amounted to no more than one-third, mostly not more than one fifth, preferably not more than one tenth of the mass of these anionic compounds according to the invention.

Very preferably, the mass ratio of surface-active compounds, the above anionic compound and the isocyanate ranged from 4 to about 10%.

Additionally, the composition may contain a catalyst, mostly hidden (released under the action of external agents, for example, visible or ultraviolet radiation, oxygen).

In the aquatic environment polyhydric alcohol is present in water-soluble or water-dispersible form.

Can be used an aqueous solution obtained, in particular, after neutralization of ionic groups, or emulsion of the polymer in water, or dispersed latex system type.

(Poly)isocyanate composition containing optionally a surfactant, such as described in this invention, is added to the aqueous emulsion of a polyhydric alcohol mainly manually while stirring the mixture with a spatula.

Translation in the emulsion is carried out mainly at temperatures below 50°C, preferably at ambient temperature. If you need to optimalizovat during preparation of the emulsion, pH, equal to at least 3 but not more than 11, preferably from 4 to 10.

According to a preferred variant implementation of the invention, the pigments, in particular titanium dioxide, dispersed in a polyhydric alcohol (alcohols) before the introduction of additives isocyanate.

According to a preferred variant of application of the present invention, after obtaining the dispersion or emulsion, the amount of components in the water ranges from 30 to 70 wt.% the total weight of the composition.

However, in the course of research that led to the creation of the present invention, in particular in the study of aliphatic isocyanates, it was found that there is a danger of a runaway various reactions in the case when using a certain amount of water. Therefore, it is necessary to exclude compositions, in which the mass ratio between, on the one hand, water and, on the other hand, the amount of the isocyanate and the surfactants according to the invention, in the aqueous phase ranges from 10-2to 0.5. For greater security, you should avoid ratios from 10-3to 1.

Used in the framework of the present invention, the polyhydric alcohol is a polymer containing at least two hydroxyl groups (phenol or alcohol), the rate of hydroxyl which is mainly from 0.5 to 5, preferably from 1 to 3 wt.% the polymer.

Its is proishozhdenie such polyhydric alcohols may be acrylic alcohol, polyester alcohol, alcohol, polyurethane-based, alcohol-based alkyd resins, or mixed, in particular, on the basis of the polyester-urethane and acrylic-urethane.

It has been unexpectedly found that excellent properties, providing chemical resistance and retrieved using the isocyanate composition according to the invention was observed regardless of the type of polyhydric alcohol, though, as a rule, properties of the coating depend on a pair of polyisocyanate/polyhydric alcohol.

The preferred polyhydric alcohol is a dispersion of aliphatic polyurethane, modified fatty acid, manufactured by ALBERDINGK BOLEY called ALBERDINGK CUR 99®.

Other polyhydric alcohol is a dispersion of a polyester polyurethane, manufactured by ALBERDINGK called ALBERDINGK U915®.

Other polyhydric alcohols, haraktrizuyutsya positive results are:

- polyhydric alcohol PRIMAL E-3275®manufactured by ROHM & HAAS,

- polyhydric alcohol ALBERDINGK AC 31®manufactured by ALBERDINGK,

- polyhydric alcohol ALBERDINGK CUR 60®manufactured by ALBERDINGK.

The molar ratio of free isocyanate functional groups and hydroxyl functional groups is from 0.5 to 2.5, mainly from 0.8 to 1.6, preferably from 1 to 1.4.

The aqueous suspension or multia a polyhydric alcohol, in which you have entered (poly)isocyanate composition and a surfactant, such as described above, after homogenization is applied to cover the canvas.

It is desirable to cause the suspension or emulsion after exposure for several hours, mostly within no more than four hours after the introduction of the (poly)isocyanate in aqueous emulsion of a polyhydric alcohol.

The mixture is applied by any known method, traditionally used for wooden surfaces, in particular surfaces in the house, namely, roller, brush, brush and even in some special cases - pneumatic gun.

As a rule, is preferably applied to cover the basis of several layers, mostly two or three.

Preferably, the thickness of the coating after drying was 5 to 150 μm, mostly from 30 to 100 μm. Typically, the coating is preferably dried at a temperature of from 20 to 60°for from 15 minutes to 48 hours.

Regardless of the type of polyhydric alcohol obtained after drying the coating, namely, colorful or varnish has excellent hardness and high resistance to chemical, cosmetic and food products.

Thus, properties that provide chemical resistance, are particularly high for solvents such as dibutyl ethyl alcohol, acetone, intensely colored foods, such as coffee, red wine, mustard, or fatty foods such as cosmetic creams.

The hardness and chemical resistance are marked for different types of wood, namely: pine, fir, spruce, ash, maple, mahogany, beech and other

Here are some examples that explain and illustrate the invention.

For a better understanding of the presented examples, see figures 1-4, in which:

figure 1 shows the results of characterizing the hardness obtained after applying the polyisocyanate kompoziia according to the invention;

figure 2 - results characterizing chemical resistance polyisocyanate compositions according to the invention;

figure 3 - results characterizing the hardness obtained after applying the polyisocyanate compositions according to the invention;

figure 4 - results characterizing chemical resistance obtained after the application of another polyisocyanate compositions according to the invention.

Hardness was measured according Toënig using film stripper after one-hour exposure in the camera, and the coating had a thickness of 30 μm - 1 and 40 μm - 3 and was applied on a glass plate.

Chemical resistance was measured on coatings applied to the base of the Siberian pine directly after mixing the components is now (isocyanate and a polyhydric alcohol). The evaluation was carried out on a scoring system from 0 to 5 (DIN industrial standards Germany) 68861, zero point corresponded to the excellent properties, 5 points corresponded to the mediocre properties). Searching products were red wine, coffee, cream NIVEA®, water, condensed milk, dibutyl phthalate, mustard and ethyl alcohol with a concentration of 48%vol.

Rhodafac® RE610 is a complex mixture of mono - and diesters of phosphorous, according to the formula II, the average composition of the hydrocarbon radical is polyethoxysiloxane (tenfold) Nonylphenol. The molar ratio between the complex mono - and W is about 1 (after mathematical rounding). Rhodafac®PA17 also includes the quality of the product, according to the invention, a complex mixture of mono - and diapir phosphor according to the formula II, the average composition of the hydrocarbon radical is polyethoxysiloxane (five times) Nonylphenol.

EXAMPLE 1

Preparation of (poly)isocyanate composition according to the invention

165 g of the oligomer of isocyanurate-based trimer Tolonate® HDT was mixed with 24 g of butyl acetate and 13 g of Rhodafac® RE610 (a complex mixture of mono - and diesters of phosphorous according to the formula (II) and 3 g of triethylamine. The mixture was stirred using a frame mixer or disperser for 5 minutes at a speed of 100 Rev/min the Mixture was wascott the 0,84 PA· with 20°and coloring of less than 100 ARNA.

EXAMPLE 2

A mixture was prepared from 92 g of Tolonate® HDT, 10 g of Rhodafac® RE610 and 2.3 g of triethylamine. The viscosity of the mixture was 5.2 PA·20°painting less than 100 ARNA.

EXAMPLE 3

Examples on the use of the

Prepared aqueous suspension of a polyhydric alcohol (1st component)containing (in the sequence of addition of components):

AlberdingkU 915® (37,1%)39,1
Butylglycol2,7
Butyldiglycol2,7
Waterof 7.75
Byk® 0281,1
Byk®0,15
Acrysol® RM 81
Acrysol®RM 10200,5
Alberdingk® U 915 (37,1%)45
Total:100

Mixture was prepared consisting of the composition according to example 3, isocyanate compositions according to examples 1 or 2, and two isocyanate compositions known from the prior art (comparative examples), to obtain the following target tracks:

The hardener13456
The composition is according to example 2 8565
Composition 1*known from the prior art85
Composition 2**known from the prior art65
The composition according to example 1100
Proglyde DMM®15153535
Qty component 1 (wt.%)9910910

* the oligomer isocyanurate, containing about 100% of a surfactant with a polyester chain associated with the isocyanate functional group;

** the oligomer isocyanurate, containing about 100% of a surfactant with a polyester chain associated with the isocyanate functional group.

The prepared mixture was applied on a wooden base (Siberian pine) in the form of three successive layers at a thickness of 30 μm each (after drying).

For each coating was evaluated hardness according to Koenig, as well as resistance to ostatnio various chemical, cosmetic or food products according to the standard DIN 68861.

The results are presented in figure 1 (hardness) and figure 2 (chemical resistance).

EXAMPLE 5

Examples on the use of the

Prepared aqueous suspension of a polyhydric alcohol (1st component)containing (in the sequence of addition of components):

Alberdingk CUR 99® (34,7%)30
Worlee WO 604 N0,5
Dowanol DPM2
Ethyldiglycol3
Water6
Byk® 3330,2
Byk® 3460,3
Acrysol® RM 20200,5
Alberdingk® CUR 99 (34,7%)of 57.5
Total:100

Mixture was prepared consisting of the composition according to example 3, isocyanate composition according to example 1 or 2 and two isocyanate compositions known from the prior art (comparative examples), to obtain the following target tracks:

The hardener1346
The composition according to example 285
Composition 1*known from the prior art85
Composition 2**known from the prior art65
The composition according to example 1100
Proglyde DMM®151535
Qty component 1 (wt.%)99109
* the oligomer isocyanurate, containing about 100% of a surfactant with a polyester chain associated with the isocyanate functional group;

** the oligomer isocyanurate, containing about 100% of a surfactant with a polyester chain associated with the isocyanate functional group.

The prepared mixture was applied on a wooden base (the base of Siberian pine) in the form of three successive layers with a thickness of 30 μm each (after drying).

For each coating was evaluated hardness according to Koenig, and resistance to various chemical, cosmetic or food products according to the standard DIN 68861.

The results are shown in figure 3 (hardness) and figure 4 (chemical resistance).

In any case, the final solid is the outer coat of the coating was higher when using isocyanate compositions according to the invention, than when using isocyanate coatings known from the prior art.

Chemical resistance exceeded 1 and 2 times the resistance of the coatings obtained using the polyisocyanate compositions known from the prior art.

1. The way of drawing on the canvas with a wooden surface with high resistance to chemical products, characterized in that it comprises the following steps:

a) adding to the aqueous slurry a polyhydric alcohol composition based on isocyanate(s) and anionic surfactants (surfactant)having a hydrophilic part containing anionic group, and a lipophilic part containing hydrocarbon radical, with the specified surfactant also contains a fragment of polyethylene and/or polypropyleneglycol chain, at least 1, mostly, at least 5, preferably at least 7 ethyleneoxy and/or propionyloxy-links, with the specified composition based isocyanate(s) contains not more than 30 wt.% Surfactant associated with the isocyanate group, for the formation of emulsions of the isocyanate(s) and a polyhydric alcohol in water;

b) applying the mixture on the wooden surface of the base;

c) aging the reaction of the isocyanate(s) with a polyhydric alcohol, necessary for the formation of polyurethane.

2. The method according to claim 1, characterized in that the anionic surfactant is present in the composition based on the isocyanate(s).

3. The method according to claim 1, characterized in that the composition based on the isocyanate(s) contains no more than 20 wt.% Surfactant associated with the isocyanate functional group.

4. The method according to claim 1, characterized in that the composition based on the isocyanate(s) contains no more than 10 wt.% Surfactant associated with the isocyanate functional group.

5. The method according to claim 1, characterized in that the anionic surfactant contains at least one functional group selected from sulfates or phosphates and aryl(s) and/or alkyl(s), aryl - or alkylphosphonate - phosphinate or sulfonate.

6. The method according to claim 1, characterized in that the lipophilic part of the surfactant is an alkyl or aryl group.

7. The method according to claim 1, characterized in that the anionic surfactant corresponds to the formula:

where q is 0 or 1; R indicates an integer equal to 1 or 2; m is zero or an integer from 1 to 2; X and X', equal or different, denote a chain with no more than two carbon atoms; s is zero or an integer selected from the range of 1-30, mainly from a range of 5 to 25, preferably from a range from 9 to 20; n is zero or an integer selected from the range of numbers 1-30, mainly from a range of 5 to 25, preferably from a range of 9-20; E submitted is a phosphorus or sulfur; R1and R2identical or different, denote a hydrocarbon radical selected mainly from optional substituted arrow or Akilov, with proteotion is selected from inorganic cations, metal cations or organic cations.

8. The method according to claim 7, characterized in that proteotion represents an ammonium cation, formed tertiary amine.

9. The method of claim 8, wherein the tertiary amine is triethylamine.

10. The method according to claim 1, characterized in that the surfactant, represents a complex mixture of mono - and diesters nonylphenolethoxylates phosphoric acid, contains ten ethyleneoxy links.

11. The method according to claim 1, characterized in that the mass ratio between the isocyanates and the anionic surfactant is not more than 1/3, mostly not more than 20%, preferably not more than 10% and 1%, mostly more than 2%.

12. The method according to claim 7, characterized in that the amount of surface-active substance (s) is from 10-2up to 1 atom E in 1 liter

13. The method according to claim 1, characterized in that the polyisocyanate composition containing a surfactant, is added to the emulsion polyhydric alcohol manually.

14. The method according to claim 1, wherein the polyhydric alcohol is a dispersion of a complex of the polyester and polyurethane.

15. The method according to claim 1, distinguished by the different topics that (poly)isocyanate is selected from the products of Homo - or heterocedasticity of alkalinisation.

16. The method according to claim 1, characterized in that the molar ratio of free isocyanate functional groups and hydroxyl functional groups of the polyhydric alcohol is from 0.5 to 2.5, mainly from 0.8 to 1.6, preferably from 1 to 1.4.

17. The method according to any of the preceding paragraphs, characterized in that the thickness of the coating after drying is from 5 to 150 μm, mostly from 30 to 100 μm.

18. The method according to any of the preceding paragraphs, characterized in that it includes a step of drying at a temperature of from 20 to 60°for from 15 minutes to 48 hours



 

Same patents:

FIELD: protective coatings.

SUBSTANCE: invention relates to methods for protecting metallic surfaces of geophysical instruments for exploring wells against combined action of generated acoustic field, drilling mud components, and formation fluids causing rapid wear of well instrument body. Gluing of protective polyurethane coating to cleaned and degreased metallic surface is effected by a way wherein glue composition based on triphenylmethanetriisocyanate in organic solvent is preliminarily applied onto surface as a layer with thickness 0.5-5 μm, preferably 1-3 μm, after which applied film is aged for 15-30 min at 100°C or for 12-18 h at 20-25°C and relative air humidity 30 to 98% and then protective coating based on lacquer polyurethane and/or poured polyurethane composition is deposited and hardened by a known method.

EFFECT: improved quality of received acoustic signal.

4 cl, 1 tbl, 3 ex

FIELD: building materials.

SUBSTANCE: invention relates to polyisocyanate compositions used for impregnation of concrete construction surfaces for aims of their anti-corrosive protection, and to a method for concrete impregnating by using the indicated composition. The claimed composition comprises earth-alkali metal salt dissolvable in polyisocyanate taken in the amount 0.1-5 mas. p. p. per 100 mas. p. p. of polyisocyanate. Except for, the composition can comprise additionally a hydrophobic solvent and a hydrophobic plasticizer. The claimed composition provides the deep penetration of impregnation up to 9.5 mm. The composition can be used in impregnation of brick masonry, sandy-cement covering for floors, in reconstruction of reservoirs for liquids storage and ferroconcrete constructions.

EFFECT: improved and valuable properties of composition.

6 cl, 1 tbl, 27 ex

FIELD: protective coatings.

SUBSTANCE: invention provides coating composition comprising first compound containing at least one bicyclo-ortho-ester functional group, second compound containing at least two isocyanate groups, and third compound containing at least one thiol group.

EFFECT: enlarged assortment of coatings.

19 cl, 10 tbl, 30 ex

FIELD: polymer production.

SUBSTANCE: coating composition comprising at least one compound with at least two isocyanate functional groups; at least one compound reactive to isocyanate and having at least two groups reactive to isocyanate groups, which are selected from mercapto groups, hydroxyl groups and combinations thereof; and cocatalyst consisting of phosphine and Michael acceptor, amount of catalyst constituting from 0.05 to 20% of the weight of dry residue. Invention also describes a method for coating substance with indicated composition as well as coated substrate, and adhesive containing at least one compound with at least two isocyanate functional groups and at least one compound containing at least two above defined groups reactive to isocyanate groups. Moreover, invention discloses employment of composition for finishing of great vehicles and refinishing of motor cars. Composition is characterized by drying time at a level of 20 min, modulus of elasticity 1904, Persose hardness 303, and brightness (85°C) at a level of 100.

EFFECT: expanded coating assortment.

16 cl, 16 tbl, 48 ex

FIELD: protective coatings.

SUBSTANCE: invention relates to composition to form coatings with quick-setting surface at ambient temperature for use in re-finishing industry, in manufacture of clear coating, and as primer layer in multilayer coating. Composition contains at least one latent base-type photoactivator and base-catalyzed polymerizable or hardenable organic material including isocyanate-reactive groups bearing at least one thiol group.

EFFECT: enabled preparation of compositions, which can be UV hardened and are characterized by acceptable setting velocity at ambient temperature in locations not easily accessible for UV emission.

15 cl, 11 tbl, 10 ex

Polymer composition // 2263695

FIELD: polymerizing mixtures for making water-repellent and anticorrosive coats.

SUBSTANCE: proposed polymer composition contains polyester resins, styrene, hardening agent-peroxide compounds and accelerating agent, inert substances, gel-type binder, paraffins and poly-urethanes. Proposed composition increases service life of coat due to reduction of effect of aggressive factors of outside medium on characteristics of coat.

EFFECT: increased rate of polymerization without considerable stresses in coat; facilitated procedure of applying coats on base of this composition.

23 cl, 80 ex

FIELD: spray compositions for coating.

SUBSTANCE: the invention is pertaining to a composition used for coating including at least one isocyanate- reactive compound containing: a) at least one thiol group; b) at least one polyisocyanate-functional compound; and c) a catalytic agent containing at least one organometallic compound, in which as a metal is used a metal from groups 3-13 of Mendeleyev's periodic system of elements. The invention is also pertaining to usage of the composition for spray coating in the form of the transparent coating layer, to its use in the form of the transparent coating layer in a multilayer lacquer coating and to its use for a repeated finishing and for refinishing of the large-scale transportation means.

EFFECT: the invention ensures production of transparent coating layers used in multilayer lacquer coatings and refinishing of the large-scale transportation means.

11 cl, 17 ex

FIELD: polymer materials.

SUBSTANCE: composition contains 5-95% of alkali-swelled polymer prepared by stepped nucleus/shell-type polymerization and 95-5% of at least one polyurethane. Composition is suitable as priming in priming/transparent layer system, which is characterized by high mechanical properties, high "flop", good brightness, essentially lack of "penetration", and good waterproofness.

EFFECT: reduced coating drying time and number of layers.

8 cl, 3 tbl, 17 ex

FIELD: varnish-and-paint industry.

SUBSTANCE: invention relates to polyurethane coatings intended to be applied on a variety of surfaces (metal, wood, etc.). Composition comprises toluene solution of hydroxyl-containing component and toluene solution of polyisocyanate. Hydroxyl-containing component is oligoether obtained by in-melt reaction of tall oil with triethanolamine at 170-200°C and characterized by viscosity at most 10000 mPa·s, acid number at most 5.0 mg KOH/g and hydroxyl number 125-138 mg KOH/g. Oligoether-to-polyisocyanate ratio is 1:1.

EFFECT: enabled preparation of two-component lacquer with elevated light resistance, water resistance, and stability, which is suitable for anticorrosive coatings on metal products.

3 cl, 1 tbl

FIELD: corrosion prevention technologies.

SUBSTANCE: method includes serial application of layers of polymer compositions to metallic surface, while serial layers of polymer compositions are made with various thermal expansion coefficients. As said polymer composition polyurethane compound is used with special admixtures and filling agent, influencing thermal expansion coefficient of covering layer, and content of said filling agent in each following layer is set less than content of said filling agent in previous layer.

EFFECT: higher efficiency.

2 cl, 9 ex

FIELD: polymer production.

SUBSTANCE: invention provides composition for preparation of gradient hydrogel polymer material based on copolymers of acrylamide and N,N'-methylene-bis-acrylamide representing following system: (i) mixture of dilute solution containing 2-3% acrylamide, 0.1-0.2% N,N'-methylene-bis-acrylamide, 0.01% ammonium persulfate, and, as viscosity regulator, 0.5-2.0% glycerol or 1:1 mixture of glycerol and polyvinyl alcohol, each taken in amount 3.5-8.0%, in bidistilled water and (ii) and concentrated solution containing 6-45% acrylamide, 0.6-1.0% N,N'-methylene-bis-acrylamide, and 0.04% ammonium persulfate in bidistilled water, said dilute solution constituting 75-80% and said concentrated solution 20-25% of the total weight of the system. Components are distributed in gradient manner in final system. Invention also discloses a method of preparing gradient hydrogel polymer material based on above-indicated copolymers and indicated gradient hydrogel polymer material. Value and direction of gradient of modulus of elasticity of hydrogel polymer materials is controlled by concentration of viscosity regulator.

EFFECT: expanded possibilities for preparing gradient hydrogel polymer materials.

3 cl, 1 tbl, 8 ex

The invention relates to polymers useful in the adhesive compositions, in particular to polymer dispersions and glue, made with its application

The invention relates to a method of obtaining a stable fine dispersion of polymers designed to get machaneh products, products coated and adhesive compositions

The invention relates to a composition and method for producing a non-ionic and anionic water-soluble polymers in the form of finely dispersed particles of the polymer in aqueous salt environment
The invention relates to the production of thermoplastic poliuretanowy in fine form, which can be used for the manufacture of coating film materials, artificial leather, adhesives, binders, adhesives, construction materials, as well as modifying additives to other polymers
The invention relates to a liquid polymer compositions, which contain both cationic polymer having a high characteristic viscosity and cationic polymer coagulant having a low characteristic viscosity, to their preparation and use

Water dispersion // 2183646
The invention relates to compositions containing the aqueous dispersion, which can be used in biotechnology for the dehydration and purification of waste, and consisting of (a) a first cationic water-soluble or Vodonaeva polymer having at least one recurring element of the formula I, where R1- N or CH3And - O or NH, In - Allenova or branched Allenova or oxyalkylene group having 1-5 carbon atoms, R2represents methyl, ethyl or through group, R3is methyl, ethyl or through group, R4is an alkyl or substituted alkyl group having 1-10 carbon atoms, or aryl or substituted aryl group having 6-10 carbon atoms, X is a counterion and R2, R3and R4together contain in total at least 4 carbon atoms; (b) at least one second water-soluble polymer different from the first specified polymer; (c) kosmotropic salt and (d) chaotropes or anionic organic salt

The invention relates to the field of polymer dispersions, in particular to a method for producing low-viscosity water-soluble polymer dispersions, water-based

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

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