Coating composition

FIELD: chemistry.

SUBSTANCE: invention relates to liquid rubber based compositions for coating playgrounds, floors, roofs and applying insulation coatings in construction. The coating composition contains an isocyanate prepolymer obtained from reacting 4,4'-diphenylmethanediisocyanate and oligodienediol with molecular weight 2800-3200, content of hydroxyl groups of 0.88-1.3% with ratio of isocyanate to hydroxyl groups equal to 4:1, with content of isocyanate groups in the prepolymer of 8.0-9.7%, a base - rubber composition from low-molecular weight hydroxyl-containing rubber, plasticiser, filler, anti-ageing agent and a pigment, a urethane formation catalyst and a mixture of 2,4- and 2,6-isomers of 3,5-dimethylthiotoluylene diamine in ratio of 80:20.

EFFECT: composition increases strength, hardness and relative elongation of the coating.

2 tbl

 

The invention relates to compositions for coatings based on liquid rubbers designed for covering sports grounds, floors, roofing and insulating materials in construction.

Known composition for coating comprising a low molecular weight hydroxyl-containing rubber is a copolymer of isoprene and butadiene, polyisocyanate, catalyst retinoblastoma. Additionally, the composition may contain a desiccant, a filler, a plasticizer, a low molecular weight alcohol, pigment, alkylphenolic antioxidant and rheological additive (see RF patent 2268279, C09D 175/14. Publ. 27.11.2006, bull. No. 2).

Known composition for coatings, including oligodontia copolymer of isoprene and butadiene, plasticizer, filler, trifunctionally low molecular weight alcohol, catalyst retinoblastoma, 2,4,6-tri-tertbutylphenol, the curing agent is a polyisocyanate, and optionally ethyl silicate (see RF patent 2186812, C09D 109/00. Publ. 10.08.2002).

The disadvantage of these compositions is the low strength of the solidified elastomeric coatings.

Known composition for coatings, including oligomerization, plasticizer, mineral filler, trifunctionally low molecular weight alcohol, catalyst retinoblastoma, 2,4,6-tri-tertbutylphenol, the polyisocyanate and ethyl silicate (see RF patent 2190002, 09D 175/08. Publ. 2709.2002).

The disadvantage of this composition is the low strength of the elastomeric coating.

The closest solution of the present invention (the prototype) is the composition (see RF patent 2285026, 09D 175/14. Publ. 10.10.2006, bull. No. 28), comprising isocyanate curing agent is a polyisocyanate, catalyst retinoblastoma and the basis of hydroxyl-containing polybutadiene rubber with a molecular weight of 2100 and content of hydroxyl groups of 1.2 to 1.9%, or molecular weight 3000-3200 and content of hydroxyl groups of from 0.88 to 1.36%, or molecular weight 5000-5300 and the content of hydroxyl groups of 0.6-0.8% in the ratio of components, parts by weight:

The plasticizer 20-100
The specified hydroxyl-containing polybutadiene rubber100
Isocyanate curing agent is a polyisocyanate10-36
Catalyst retinoblastomaof 0.001 to 3.0
Additionally, the composition may contain:
The desiccant (calcium oxide, gypsum, cement)5-20
Filler (chalk, talc, lime-dropout, kaolin)50-250
Low molecular weight alcohol with not less than two
hydroxyl groups, or a component of the AF-21-8
Alkylphenolic antioxidant0,5-2,0
Pigment0.5 to 10.0
The rheology modifier surfactant0,5-5,0

Coatings of this composition are characterized by inadequate mechanical properties. This is due to the fact that the polyisocyanate curing agent based diphenylmethanediisocyanate insufficiently compatible with hydrocarbon butadiene rubber polymer based composition. By mixing rubber non-polar bases and polar aromatic MDI unable to obtain a homogeneous system. The polyisocyanate as the curing agent is not efficient enough, which reduces the degree of cure and leads to a lower level of strength properties of the coating.

The aim of the invention is to improve the strength properties, especially the strength of the coating.

This objective is achieved in that the composition for coating comprising from tianity hardener, catalyst retinoblastoma and the Foundation, as the isocyanate hardener contains a prepolymer obtained by the interaction of 4,4'-diphenylmethanediisocyanate and oligodontia with a molecular mass of 2800-3200, the content of hydroxyl groups of from 0.88 to 1.3% when the ratio of isocyanate and hydroxyl groups of 4:1 with a content of isocyanate groups in the prepolymer 8.0 to 9.7 per cent, as the basis contains a rubber composition of low molecular weight hydroxyl-containing rubber, plasticizer, antioxidant, filler and pigment in the following ratio of the components of the rubber composition, parts by weight:

Low molecular weight hydroxyl-containing rubber100
The plasticizer60-180
Filler100-440
Antioxidant1-2
Pigment1-20

and additionally mixture of 2,4 - and 2,6-isomers of 3,5-diethyltoluenediamine in the ratio of 80:20, with the following ratio of the components of the composition, parts by weight:

Rubber track100/td>
Specified isocyanate hardener17-42
A mixture of 2,4 - and 2,6-isomers of 3,5-diethyltoluenediamine1-3
Catalyst retinoblastomaof 0.01-0.1

The composition may contain rheological additive for improving wettability, dispersibility, which reduces the viscosity and improves the processing properties of the composition, for example, surfactant, oleic or stearic acid, organosiloxane modifiers.

The technical result, the increase in strength is achieved through the use of hardener isocyanate prepolymer based on liquid hydroxyl-containing butadiene rubber and 4,4'-diphenylmethanediisocyanate with a ratio of NCO and HE is 4, in combination with a 3.5-dimethylethylenediamine (atakor 300). Molecular weight hydroxyl-containing rubber 2800-3200, the content of terminal hydroxyl groups in the rubber 0,88-1,3%, the content of isocyanate groups in the prepolymer 8.0 to 9.7 per cent.

Butadiene nature of the main chain isocyanate prepolymer hardener and diene molecular chains of the rubber composition can achieve full compatibility isocyanate hardener and base. As a result, when solenoidoperated homogeneity of the composition, increases the efficiency of crosslinking. In addition, higher molecular weight flexible diene chain between the isocyanate groups in the molecule of the curing agent, allows you to move the mesh nodes arising from the reaction of hydroxyl groups of rubber, amino 3,5-diethyltoluenediamine (atakor 300) and the isocyanate groups of the hardener. However due to the large flexibility of cross-linked diene chains is their orientation and strengthening of the cured elastomer. The combination of the isocyanate prepolymer and itakura leads to the formation of additional nodes stitching without loss of viscoelasticity and increase strength.

In addition, the increase in strength is obtained by using as a basis the rubber composition of the rubber, plasticizer, filler, pigment and antioxidant, in which all components are pre-dispersed to a homogeneous state, until the introduction of the isocyanate prepolymer, catalyst retinoblastoma and 3.5-diethyltoluenediamine as a crosslinking agent and prior to the beginning of structure formation in the composition.

The base is a rubber composition is a suspension of powdered fillers, plasticizers, pigments, antioxidants, moist collectors in the hydroxyl-containing liquid hydrocarbon-rubber SOPS-1K, krasol. SOPS-1K - idci copolymer of isoprene to butadiene ratio of isoprene and butadiene, 20:80, the content of hydroxyl groups of from 0.7 to 1.1%. Cresol - liquid butadiene rubber molecular weight of from 2000 to 5000, the content of hydroxyl groups of from 0.6 to 1.9%.

Rubber composition - based compositions for coatings produced commercially by THE 5775-004-22474 224-96 - polyurethane mastic; on THE other 5775-001-34702 890-99 - composition danurasana "Sportline"; on THE other 2513-560-22462037-98 - composition "Alastor".

To obtain the isocyanate prepolymer use of low molecular weight hydroxyl-containing rubber krasol LBH-3000. The isocyanate prepolymer receive the following procedure: a sample of 200 g of the rubber content of 1.1% of hydroxyl groups are placed in a flask, heated to 80°C. with stirring, maintained at this temperature under vacuum at a residual pressure of not higher than 10 mm Hg for 60 minutes, enter to 64.8 g of 4,4'-diphenylmethanediisocyanate and incubated at 80°C under stirring for 2 hours. The resulting prepolymer is poured and cooled.

As a catalyst retinoblastoma use tertiary amines or ORGANOMETALLIC compounds, commonly used in polyurethane chemistry, such as dimethylbenzylamine, dibutylthiourea tin, octates tin, etc.

As fillers basics - rubber composition using chalk, talc, kaolin, rubber crumb, lime-fines, dolomite flour, lime and other

Plasticizers service is t a chlorinated paraffin wax, alkyl(aryl)new esters of phthalic, phosphoric acid, oil of petroleum origin. For example, chloroparaffin CP-470, oil "Naloxol", dibutyl phthalate.

As the antioxidant composition comprises predominantly colorless treatment of phenolic or organophosphorus compounds, such as 2,6-ditretbutyl-4-METHYLPHENOL (Agidol-1), 2,4,6-tetrachlorophenol, 2,2-methylene-bis-(4-methyl-6-tertbutylphenol) (product 2246).

To impart the desired color composition comprises pigments: iron oxide, chromium oxide, zinc oxide, titanium dioxide, organic azo and phthalocyanine pigments, phtalocyanine green, phtalocyanine blue and other

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources and identify sources that contain information about the equivalents of the claimed invention, allowed the Complainant to establish the absence of analogues characterized by signs, identical to all the essential features of the claimed invention. The definition of all identified unique prototype, as the most similar in essential features analogue, revealed a set of distinctive features with respect to the apparent technical result in the claimed compositions set forth in the claims. Therefore, the claimed image is the group meets the condition of "novelty."

The technical result of the increased strength of the coating when using isocyanate diene prepolymer hardener and base in the form of a rubber composition in combination with glycerol as a crosslinking agent is not obvious, since the analysis of the known solutions do not give grounds to assume that the combination of these components should lead to improving the strength of the hardened products.

For the manufacture of compositions for coating use mixing equipment to ensure the homogenization of the isocyanate prepolymer, catalyst retinoblastoma and cross-linking agent is 3,5 - diethyltoluenediamine in the rubber composition.

A rubber composition is prepared beforehand by mixing and dispersion in rubber all components: powdered fillers, plasticizers, antioxidants, pigments, moist collectors. An industrial application of the components is dispersed in the rubber before milling degree not greater than 100 microns in a ball mill. The isocyanate prepolymer, 3,5-diethyltoluenediamine and catalyst retinoblastoma are supplied with a rubber composition and put it immediately before preparation of a composition for coating and its application on the ground.

The invention is illustrated by the following example.

On ESCO rubber composition 200 g, prescription number of ethacure 300 is placed in the mixer, ensuring uniform mixing or glass for hand mixing with a spatula. Stirred for 5 minutes until smooth, introducing a portion of isocyanate prepolymer, catalyst and again stirred for 5 minutes. The resulting mixture is poured onto a flat shape and can stand up to full cure at room temperature. Control curing in terms of hardness. The curing time at 20-25°C for 3-5 days, after which, the hardness of the samples ceases to change. Similarly prepared composition on the prototype by sequential injection and mixing of rubber with all components. The compositions shown in table 1. Properties of samples of the coatings of the compositions are shown in table 2. Testing of the samples was carried out according to known standard methods.

Table 2
Properties of the coatings of the compositions
IndicesCompositions compositions (see table 1)
12456789101112131415161718A prototype RF patent 2285026
1. Conditional tensile strength, kgf/cm213262638363222341721253624201525191516
2. Elongation, %260230220220210 200140210160140130130140130901159080100
3. Hardness, shore a, usled48525567646362656065646360586661656854
4. Ball rebound resilience, %303638404240384236 39404237382637363235

From table 2 it is seen that the claimed composition provides coatings with higher complex characteristics. Increases the strength, elongation at break, hardness and elasticity. The increase of the complex mechanical properties is achieved by using the rubber composition of the substrate and curing it the isocyanate prepolymer in combination with itakura 300.

The reduction of the number of isocyanate prepolymer leads to a decrease in strength due to the significant deviation of the ratio of NCO:OH of equimolecular and reduce the density of the stitching. When large amounts of prepolymer strength also decreases because of the excess NCO groups, the tendency to foaming, the increase in the rigidity of the cured product.

The number and nature of the pigment does not affect the mechanical properties of the coatings, change only the color and intensity of color.

The number of ethacure 300 - linking agent, as well as the number of isocyanate prepolymer has a significant influence on the properties of the coatings. When mA the om content of ethacure 300 decreases the degree of crosslinking, with the rich content of ethacure 300, you must increase the amount of prepolymer, which leads to higher density of cross-linking to increase stiffness and loss of strength.

Catalyst retinoblastoma regulates the viability and curing speed without affecting the properties of the coating.

The increase in the degree of filling rubber composition creates difficulties when mixing and formation of the monolithic structure of the coating due to the large proportion of dry ingredients. The mixture is difficult when small quantities of plasticizers, and the upper limit of plasticizers limited compatibility with polymers.

The antioxidant has little effect on the properties of hardened coatings typically use within 1-2 parts by weight of a Smaller number reduces the resistance to thermal-oxidative aging, and large doses can lead to deterioration in strength due to the potential deactivation of the isocyanate groups of the prepolymer with hydroxyl groups of the antioxidant.

Thus, the advantage of the coatings of the proposed composition is to increase the strength, elasticity, hardness, and relative elongation.

Composition for coating comprising isocyanate hardener, catalyst retinoblastoma and a base, characterized in that as isocyanate hardener contains a prepolymer, polucen the th interaction 4,4'-diphenylmethanediisocyanate and oligodontia with a molecular mass of 2800-3200, the content of hydroxyl groups of from 0.88 to 1.3% when the ratio of isocyanate and hydroxyl groups of 4:1 with a content of isocyanate groups in the prepolymer 8.0 to 9.7 per cent, as the basis contains a rubber composition of low molecular weight hydroxyl-containing rubber, plasticizer, filler, antioxidant and pigment in the following ratio of the components of the rubber composition, parts by weight:

Low molecular weight hydroxyl-containing rubber100
The plasticizer60-180
Filler100-440
Antioxidant1-2
Pigment1-20

and additionally mixture of 2,4 - and 2,6-isomers of 3,5-diethyltoluenediamine in the ratio of 80:20 in the following ratio of the components of the composition, parts by weight:
Rubber track100
Specified isocyanate hardener17-42
A mixture of 2,4 - and 2,6-isomers of 3,5-diethyltoluenediamine1-3
Catalyst retinoblastomaof 0.01-0.1



 

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FIELD: construction.

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Polymer composition // 2397193

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compositions for elastomeric waterproofing, roof coating, floor and sports field coatings. The said composition contains 100 pts. wt isocyanate prepolymer, 3-30 pts. wt ethoxylated glycerin or glycerin, or trimethylol propane as a hardener and 0.005-0.01 pts. wt tin dibutyl dilurate. The isocyanate prepolymer used is obtained by reacting four moles of 4,4'-diphenylmethane diisocyanate and one mole of oligobutadiene diol with molecular weight of 2800-3200, containing 0.9-1.3% hydroxyl groups, while the prepolymer contains 8.0-9.7% isocyanate groups.

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Polymer composition // 2397192

FIELD: chemistry.

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EFFECT: polymer composition provides improved strength properties of elastomers and coatings obtained from it, specifically higher strength, hardness, relative elongation and adhesion properties of the coating.

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Polymer composition // 2393190

FIELD: chemistry.

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1 tbl

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8 cl, 2 tbl

Rubber coating // 2268279

FIELD: rubber materials.

SUBSTANCE: invention relates to rubber coatings used mainly for sporting platforms, floorings, roofing and insulating coverings. The coating composition comprises the following components, mas. p. p.: hydroxyl-containing copolymer of isoprene and butadiene with the ratio of monomers = 20:80, molecular mass 3000-3500 Da, the content of hydroxyl groups is 0.7-1.1 wt.-%, 100; polyisocyanate, 10-36; catalyst for urethane formation, 0.001-0.3. Coating can comprise additionally a water-absorbing agent, up to 20; a filling agent, up to 250; plasticizer agent and/or solvent, up to 100; low-molecular alcohol or aminophenol component, up to 8; an alkynophenol antiager, up to 2; pigment, up to 10, and components improving rheological properties or organosiloxane modifying agents, up to 5. Proposed composition provides enhancing abrasion resistance and coating structure.

EFFECT: improved and valuable properties of coatings.

9 cl, 2 tbl, 1 ex

Coating composition // 2266935

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2 cl, 2 tbl

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1 tbl

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1 tbl, 2 ex

FIELD: chemistry.

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2 cl, 3 ex

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23 cl, 5 tbl, 24 ex

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9 cl, 1 dwg

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8 cl, 4 tbl, 76 ex

FIELD: construction.

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6 tbl

FIELD: chemistry.

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3 cl, 1 tbl

FIELD: inorganic chemistry.

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EFFECT: production of high-adhesive coating material with high protective properties.

3 ex

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EFFECT: possibility of obtaining ecologically pure composition of protracted term of storage; enhanced heat conductivity of coat.

3 cl, 5 ex

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EFFECT: composition with high adhesion to concrete and metal surface and improved strength.

2 tbl

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