Heat resistant coating composition

FIELD: chemistry.

SUBSTANCE: heat resistant coating composition contains polyorganosiloxane resin, acrylic resin - isobutylmethacrylate polymer, heat resistant pigment, ground mica and/or porous silicate as an aggregate, a rheological additive - bentonite clay, pentaphtol lacquer, thickener - pangel or tixogel and an organic solvent. The porous silicate can be pearlite or kieselguhr and the heat resistant pigment can be aluminium powder or heat resistant pigments of different colours.

EFFECT: coatings obtained using the disclosed composition have good physical and mechanical properties.

3 cl, 3 tbl

 

The invention relates to a paint and varnish materials and can be used in mechanical engineering to protect metal surfaces operating at elevated temperatures, under conditions of high corrosiveness of the environment, as well as in everyday life (colouring furnace systems, roofs, metal doors), and industry (for protective coloration engines and exhaust systems of automobiles and tractors, for the painting of equipment and pipelines in the oil and gas industry, flues and furnaces for the incineration of waste for thermal insulation of building structures.

Known composition for heat-resistant coating, comprising polyphenylsiloxane resin, acrylate copolymer, aluminum powder and an organic solvent, a filler, and a rheological additive. In use as a filler Aerosil, micro-talc, and as rheological additives are bentonite, tixosil VN or the other additives of the type montmorillonite. EN 2137793 6 C09D 183/06, C09D 5/08, C09D 183/06, C09D 133:06 1999.09.20.

Known composition for protective coatings containing polyphenylsiloxane resin, a copolymer of butyl methacrylate and methacrylic acid, a pigment and an organic solvent. EN 2157397 7 C09D 183/04, C09D 5/08 2000.10.10

However, these compositions are not sufficiently high hardness film and reduced sedimentation stability in the Jesse storage.

The closest analogue to the technical essence and the achieved result of the claimed invention is a composition for heat-resistant corrosion-resistant coating containing polyphenylsiloxane resin, acrylic copolymer, the heat-resistant pigment, filler - ground mica or ground mica powder mixed with zhelezokremnistykh or micro-talc., rheological additive and an organic solvent. EN 2182582 7 C09D 183/04, C09D 5/08 2001.09.10

However, the known arrangement has a lower sedimentation stability during storage, and coatings based on it, have a relatively low efficiency in operation.

The task, which is aimed by the invention, is to increase the effectiveness of protective coatings on the basis of the claimed composition in operating conditions due to the improvement of physico-mechanical properties of the coating and the expansion of the means of this assignment.

The technical result is:

- improvement of physico-mechanical properties of coatings;

- improve the sedimentation stability of the composition during storage;

- reducing the cost of the composition by reducing the composition amounts of costly organopolysiloxane resin, heat-resistant pigments;

- saving paint material for MF is t to decrease the amount of indicator coverage.

This is achieved in that the composition for heat-resistant coatings containing organopolysiloxane resin, acrylic resin, heat-resistant pigment, filler, rheological additive and an organic solvent, according to the invention it further comprises pentaftalevyh lacquer and thickener, and as the acrylic resin contains a polymer isobutylacetate, and as filler - porous silicate or a mixture of mica with porous silicate in the following ratio, wt.%:

Organopolysiloxane resin -20-25
Pentaftalevyh lacquer8-14
The polymer isobutylacetate5-7
The heat-resistant pigment11-17
Filler5,0-10,0
Rheological additive1-2
Thickener1-2
Organic solventRest

When this composition for heat-resistant coating as a thickener may contain pan is spruce or tixosil, or methylcellulose.

When this composition for heat-resistant coating as a porous silicate may contain perlite or diatomaceous earth.

When this composition for heat-resistant coating as a heat-resistant pigment may contain aluminum powder or heat-resistant pigments of different colors.

The composition for the protective coating was prepared as follows: in the first reactor load the calculated amount of organic solvent (60 wt.% of the total mass), polymer isobutylacetate, thickeners and rheological additives. The mixture is stirred until a homogeneous mass. In the second reactor load estimated number of organopolysiloxane resin, pentaftalevyh lacquer, remaining solvent, filler and pigments. The contents of the second reactor was dispersed for 3 hours and Then the mixture from the first reactor is pumped into the second reactor and stirred for 3 hours

The proposed composition of the heat-resistant composition is focused on the use of components manufactured on an industrial scale, with application to obtain standard equipment paint and varnish industries. It can be applied to the surface to be protected by any of the existing methods: brush, roller, dipping, air or airless methods of atomization.

Compounds 1-15 for experimental verification and invention are listed in table 1-1A. Physical and mechanical properties are given in table 2. (16 prototype).

To obtain the composition as organopolysiloxane resin used 60-70%solution of polyphenylsiloxane in xylene or toluene - TU 2228-440-05763441-2004; or 50-60%solution of polymethylphenylsiloxane in xylene or toluene - TU 2228-277-05763441-99.

As the acrylic resin used polymer isobutyronitrile under the trademark of Degalan LP 64/12 Certificate ISO 14001:1996 No. Z 1168/0203.

As pentaftalevyh varnish use Varnish PF-053 THE 2311-001-589-484-36-2003.

To obtain compositions of different colors as heat-resistant pigments used aluminum powder GOST 5494-95, various heat-resistant pigments, such as pigment black heat - THE 2364-017-00303835-96; or pigment green (1084 Green) firm Cerdes Corp. (USA).

As a rheological additive use Benton-34 f-Rheox or other inorganic substances, containing montmorillonite (bentonite clay), Aerosil, supplements based on silica, Cab-o-sil, firms Kabom (Germany). As the solvent used xylene (GOST 9410-78), THE solvent 38.101809-90, Toluene-GOST 14710-78.

The filler used mica with a particle size of not more than 160 μm - HOST-82, GOST 855-74 as porous silicate perlite with a particle size of not more than 140 μm - GOST 10832-91 or diatomaceous earth OST 18-169-74.

As will sagashite what I use Angel 20 - FT-138-96-01; tixover (TU 95 2752-2000) and methylcellulose formula [S6H7O2(OH)3-x(och3x]. Chemical properties - solid colorless amorphous substance; TPL 220-270°C, the temperature darkening 190-200°C; tight. 1,290-1,310 g/cm3(25°C), bulk density of 0.3-0.5 g/cm3. Soluble in cold water, concentrated formic and acetic acids, lactic acid, etc.

Panel - organomodified thick, chemical name hydrogenated magnesium silicate and Quaternary ammonium salt. Chemical formula: SiMg8O30(OH)4(OH2)4·8H2O; CIN26H48/. Physico-chemical characteristics: color is light cream; the appearance of dry fine powder; humidity 11%; bulk density 250 g/l±50; viscosity Brookfield not less than 70000 SR (25°C, 5 rpm); the residue on a sieve of 75 μm <1%.

Tixosil - organobentonite (TU 95 2752-2000), which is the product of the interaction of montmorillonite clays (bentonites) with the Quaternary ammonialike salts (HOUR). Physico-chemical characteristics: color - cream; density 1.8; bulk density g/l 380-540; sieve residue 90 µm 15%; primary particle size with full dispersion, t 1-5; the moisture content of 3%; temperature, °C 200-250.

Comparison of the claimed composition with a known composition allows to make a conclusion about its compliance with the foi is a series of "Novelty", as in this case contains a new set of components in the new proportions.

The specified limits of the ratios between the components of the composition are determined experimentally and are optimal from the point of view of achieving a positive technical result and minimal cost.

Optimal content pentaftalevyh varnish in the composition is 8,0-14,0 wt.%. The optimum content of the polymer isobutylacetate is 5-7 wt.%. The reduction in the content of these components in the composition results in coatings with low physical and mechanical properties (hardness film resistance to static action of water, gasoline, oil, thermal stability).

Use them in the specified quantity reduces the amount of organopolysiloxane resin, which contributes to the reduction of the total composition and the improvement of physical and mechanical properties.

In the manufacture of compositions for coatings known application pentaftalevyh varnish together with the organopolysiloxane resins and thermally stable pigments. (A.S. USSR 1694614, IPC 09D 183/06 publ. 1991). However, such coatings have insufficient heat-resistant properties and low adhesion. In the inventive compositions proposed a new combination of known components with new components and a new number is n ratio, which led to improved technical result, namely the sedimentation stability of the composition during long-term storage and have a significantly lower rate of sedimentation of particles of pigment and filler in consumable containers when it is applied. The improvement of physical and mechanical properties of the coating, and it is resistant to water, gasoline, oil film strength at impact.

The given amounts of filler and thickener in the composition are optimal. The content of these components of the above values contributes to the increased viscosity of the composition, which leads to technological difficulties in obtaining coatings.

From table 2 it follows that when used as a filler of porous silicate or a mixture of mica with porous silicate thermal conductivity of the material with the coating is 0.01 W/MK, which gives the coating on the basis of the claimed composition insulating properties.

Also optimal (11-17 wt.%) is the specified number of pigments. The increase in the content of pigments in the composition leads to a decrease sedimentation stability (observed accelerated sedimentation). The reduction in the content of pigments leads to deteriorating the hiding power of the coating, and also decreases its resistance.

Thus, the claimed composition has the high sedimentation stability during storage, faster drying and provides a heat-resistant anti-corrosion coatings with high resistance to water, gasoline and oil, extended temperature range (650°C) coating, and by reducing the amount of indicator coverage (smfbl) saves paint material.

1. Composition for heat-resistant coatings containing organopolysiloxane resin, acrylic resin, heat-resistant pigment, filler, rheological additive - bentonite clay and an organic solvent, characterized in that it further comprises pentaftalevyh lacquer and thickener - panel or tixosil, as filler contains mica ground and/or porous silica, and as the acrylic resin is a polymer of isobutylacetate in the following ratio, wt.%:

Organopolysiloxane resin20-25
Pentaftalevyh lacquer8-14
The polymer isobutylacetate5-7
The heat-resistant pigment11-17
Filler5,0-10,0
Rheological additive1-2
Thickener1-2
Organic solventRest

2. The composition according to claim 1, characterized in that the porous silicate it contains perlite or diatomaceous earth.

3. The composition according to claim 1, characterized in that the heat-resistant pigment it contains aluminum powder or heat-resistant pigments of different colors.



 

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1 tbl, 1 ex

FIELD: chemistry.

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1 cl, 1 ex, 3 tbl

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2 tbl

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2 cl, 2 tbl, 7 ex

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3 cl, 2 tbl, 9 ex

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27 cl, 7 dwg, 12 tbl

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1 cl, 2 tbl

FIELD: chemistry.

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2 cl, 2 tbl, 3 ex

FIELD: chemistry.

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14 cl, 11 ex

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4 cl, 17 tbl, 68 ex

FIELD: chemistry.

SUBSTANCE: proposed is a binding coating which is formed on the surface of a base or priming film before formation of an antifouling coating film based on organosiloxane from moisture-hardening composition based on organosiloxane containing (b1) organopolysiloxane with condensable functional groups on both ends of molecules and/or (b2) a hardening composition obtained from contact processing with heating or without heating component (b1) and filling pigment selected from a group consisting of silicon dioxide, calcium carbonate, talc, mica, clay, kaolin and barium sulphate and (b3) a silane coupling agent. Also proposed is a composite coating film, where on the surface of the said binding coating a finishing coating is formed from a hardening three-component type composition based on organopolysiloxane, where the said finishing coating contains (c1) a main component which contains component (b1), (c2) a hardening component containing tetraalkoxysiliate or its condensate, and (c3) a component which accelerates hardening, containing a metal compound. A composite coating film is proposed, where an epoxy based seal coating, the binding coating and the finishing coating are formed in that order on the surface of an old antifouling coating film (G). The proposed binding coating allows for formation of a composite coating film with excellent layer bonding properties. The composite coating film sits well on the surface of the base, on a priming film, on an old antifouling coating film etc, has excellent bonding strength between layers and can resist fouling. The coating film is mainly used for coating outer surfaces of ships, parts of marine structures immersed in water, channels for inlet and outlet of water in atomic power stations etc.

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36 cl, 7 tbl

FIELD: chemistry.

SUBSTANCE: composition contains (wt %): polyorganosiloxane or tetraethoxysilane (2.5-10), polymethylphenyl siloxane resin which is not modified or modified with polyester (0.5-7.0), copolymer based on butylmethacrylate and methacrylic acid or ester thereof (6.0-10.0), phosphorus-containing compound, selected from tris-chloroethylphosphate, tris-chloropropylphosphate or ammonium polyphosphate (25.0-35.0), butanol (6.0-10.0) and aromatic solvent (the rest). The proposed composition gives wood 100% biostability and a second group of fire-protective effectiveness.

EFFECT: design of a novel protective composition which provides high efficiency of fire- and bio-protection of wood material.

1 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: acrylic paint composition in the first version contains an acrylic film-forming - acrylic organosoluble copolymer Polyform and a copolymer of p-butylmethacrylate with methylmethacrylate, silica filler, thickener - benton or pangel, plasticiser - phthalic ester, pigment and organic solvent. In the second version the acrylic paint composition contains an acrylic film-forming - acrylic organosoluble copolymer Polyform and a copolymer of p-butylmethacrylate with methylmethacrylate and additionally a polyorganosiloxane resin, silica filler, thickener - benton or pangel, plasticiser - phthalic ester, pigment and organic solvent.

EFFECT: improved physical and mechanical properties.

2 cl, 2 tbl

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