Heat-resistant enamel

FIELD: chemistry.

SUBSTANCE: invention relates to paint materials and can be used in mechanical engineering to protect metal surfaces operating at high temperatures, in highly corrosive conditions as well as at home and in industry. The heat-resistant enamel contains organoalkoxysilane-based methyl phenyl siloxane resin of general formula: [ R h n S i O 4 n ] a [ R m ' S i O 4 m ] b [ R k 2 S i O 4 k ] c , where: n, m, k=1.2; R'=Me, H; a=0.1-33; R2=Me; b=0.03-1; c=0-0.1; as well as butyl methacrylate polymer, pentaphthalic lacquer, a heat-resistant pigment, micronised filler, a thickener, a bentonite clay-based rheologic additive and an organic solvent. The enamel enables to obtain a coating of high quality.

EFFECT: methyl phenyl siloxane resin used does not contain Cl-containing impurities, which improves environmental friendliness of the composition.

3 cl, 1 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 on the basis of polymethylphenyl siloxane resin modified pentaftalevyh varnish (lacquer KO-075)containing aluminum powder, carbon black, iron oxide, allowing to obtain uniform coverage, working in conditions of constant heat (SU 169614, IPC C09D 183/06, publ. 1991).

Known composition, which includes polymethylphenyl siloxane resin, pentaftalevyh resin (PF-060); bitumen, a mixture of monoethanolamine with aminopyrine, the solvent is toluene, xylene or solvent, pigment, aluminum powder, red iron oxide, or zinc dust (EN 2028352, IPC C09D 184/04, C09D 5/086 publ. 1995)

Known composition, which includes polymethylphenyl siloxane resin, ethyl silicate binder, black pigment, talc, mica; quartz; Aerosil, an organic solvent (EN 2106378, M IS TO C09D 183/04, C09D 5/08, C09D 183/04, C09D 183:02 publ. 1998)

The disadvantage of the above compositions is insufficient heat resistance of the coating.

Closest to the proposed invention in quality and composition is a composition for heat-resistant coatings containing polymethylphenyl siloxane resin, pentaftalevyh lacquer, polymer isobutylacetate, heat-resistant pigment, filler - porous silicate or a mixture of mica with porous silicate, rheological additive, thickener, panel or tixosil and an organic solvent in the following ratio, wt.%:

organopolysiloxane

resin20-25
pentaftalevyh lacquer8-14
the polymer isobutylacetate5-7
heat-resistant pigment11-17
the specified filler5-10
rheological additive1-2
specified thickener1-2

(EN 2378309, IPC C09D 183/06 C09D 5/08 publ. 2010; EN 2400509, IPC C09D 183/06 C09D 5/08, C09D 133/08, publ. 2010)

The objective of the decision is of which sent the invention, is the increase in environmental performance, heat resistance and durability of the coating, the expansion of the scope and cost reduction composition.

This is achieved in that the composition for heat-resistant coatings containing silicone resin-based methylphenylsiloxanes, the polymer of butyl methacrylate, pentaftalevyh varnish, heat-resistant pigment, micronized filler, thickener, rheological additive - bentonite clay and an organic solvent, according to the invention as a silicone resin contains methylphenylsiloxane resin-based organoalkoxysilanes General formula:

[Rh-nSiO4-n]a[Rm'SiO4-m]b[Rk2SiO4-k]c,where

n, m, k=1,2;R'=Me, H;
a=0.1 to 33;R2 =Me.
b=0,03-1;
c=0-0,1;

in the following ratio, wt.%:

Specified methylphenylsiloxane resin3,5-13,0
Pentaftalevyh lacquer3,0-14,5
The polymer of butyl methacrylate5,0-7,0
Heat-resistant pigmentof 10.5 to 15.0
Filler8,0-13,0
Thickener1-2
Rheological additive1-2
Organic solventrest

In this case, the filler composition comprises a micro-talc and microslide, and as a thickener, Angel.

A distinctive feature of the proposed resin is that the raw material for its production are alkoxysilane. Therefore, it is environmentally friendly, as it does not contain Cl-containing impurities, unlike resins, which are obtained on the basis of CHLOROSILANES, e.g the measures resin TO 139-297 on THE 2228-440-05763441-2004, 60%solution of polymethylphenylsiloxane in xylene or toluene or resin polymethylphenylsiloxane on THE 2228-277-05763441-99 used in all the above compositions.

This resin is made in accordance with the patent RU 2428438 (IPC C08G 77/06, C08G 77/38, publ. 10.09.2011) under the name methylphenylsiloxane resin on THE 2228-060-00209013-2008, manufacturer gnihtemos, and has the following specifications:

AppearanceThe solid product from light yellow to brown
The ratio of fragments (PhSiO1,5):(Me SiO1,5)2:1
Mass fraction of volatile substances,%, no more2,0
Softening point, °C65
The output of the inorganic residue according to TGA78
The onset temperature of degradation, °C510

The composition for the protective coating was prepared as follows:

In the estimated amount of solvent loaded into a reactor equipped with a mixer, dissolve the estimated number IU ifanillinois resin and isobutylacetate polymer, after dissolution of polymers download thickener and rheology additive, the mixture is dispersed to a homogeneous mass. Next download pentaftalevyh lacquer, filler, heat-resistant pigment and is dispersed to obtain a homogeneous mass.

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 for experimental testing of the invention and their physical and mechanical properties are given in the table.

As butylmethacrylate polymer used Degalan LP 65/12 innovations for this LP 65/12); Degalan LP 64/12 innovations for this LP 64/12) (manufacturer Evonik ROHM GmbH, Germany) and Dianal BR-116 (Dianal BR) (manufacturer MITSUBISHI RAYON CO., LTD., Japan)

As pentaftalevyh varnish used Varnish PF - 053 (TU 2311-001-589-484-36-2003) or Varnish PF-060 (TU 2311-001-52140236-2001), which is a solution of modified pentaftalevyh resin in organic solvents.

As the heat-resistant pigment used aluminum powder (GOST 5494-95), to obtain compositions of different colors as heat-resistant pigments,can also be used in various heat-resistant pigments, for example, pigment black heat resistant (THE 2364-017-00303835-96); or pigment blue (10446 Blu) or pigment green (1084 Green) firm Cerdes Corp. (USA).

As a rheological additive used Benton 34 or, Benton SD-1 F. Rheox, can be used other inorganic substances containing montmorillonite (bentonite clay).

As a solvent used xylene oil (GOST 9410-78), oil solvent (TU 38.101809-90), toluene oil (GOST 14710-78).

As the filler used microslide 10-80 (TU-005-40705684-2001), micro-talc (TU-5727-001-49439345-2004) or micro-talc for paint and pencil industry (GOST 19284-79).

As a thickener used Panel 20 - FT-138-96-01.

Panel is organoleptically thick - hydrogenated product of the interaction of magnesium silicate and Quaternary ammonium salts. Chemical formula: SiMg8O30(OH)4(HE2)4·8H2O; CIN26H48/.

Comparison of the claimed composition with a known composition allows to make a conclusion about its compliance with the criterion 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 the pros who supply a positive technical result and minimal cost.

Comparative tests based coating compositions of the prototype and claimed showed that the claimed composition forms a more durable floor Coating consisting of two layers of heat-resistant composition on the metal surface, the thickness of 22-32 μm in the temperate climates of U1 on the results of accelerated tests in accordance with GOST 9.401-91 maintains its protective properties within the time specified in table 2.

Table 2
FinishThe number of layersService life in operating conditions U1
to score A31
The claimed composition2not less than 10 years
The composition of the prototype2Not more than 7 years

The use of the resin makes it possible to greatly reduce its amount in the composition, which contributes to the reduction of the total composition and the improvement of physical and mechanical properties.

The inventive composition has a high sedimentation stability during storage, dries faster and provides reception and tocorrosion coatings with high resistance to water, gasoline and oil, extended temperature range up to 650°C) coating.

The OST. 1
Table 1
№p/pComponentsThe content of the component wt.%
12345678910111213
1Methylphenylsiloxane resin3,55,06,37,58,399,510,010,511,2to 12.012,513,0
2 Degalan LP 64/127,0---5,0--5,0-----
3Degalan LP 65/12-6,5----5,0-6,05,0---
4Dianal BR 116--5,25,0-6,7----5,85,05,0
Varnish PF 05314,513,011,5-10,08,9-7,56,05,04,03,53,0
6Varnish PF 060---10,0--8,0------
7Benton 341,21,0--2,01,8-1,2-1,31,21,1 1,5
8Benton SD-1--1,01,0--1,1-1,2----
9Panel B-201,01,81,51,61,41,11,22.01,21,11,21.31,1
10The micro-talc2,02,55,02,02,02,12,62,02,32,4 2,62,02,2
11Microslide8,09,05,010,010,08,010,08,09,09,58,09,010,0
12Aluminum alloy. powder15,0to 12.010,511,711,011,511,511,711,711,5to 12.011,710,7
13Toluene-The OST.The OST.---The OST.----The OST.
14XyleneThe OST.---The OST.The OST.-The OST.The OST.The OST.-
15Solvent---The OST.------The OST.--
The quality indicators
16Appearance
17The mass fraction VV%44,944,3to 38.343,844,744,644,943,744,944,844,844,445,0
18Viscosity by viscometer type VZ-246 with the nozzle diameter of 4 mm at 20±0.5°C44423539454346374543424246
19Drying time to degree 3 at 20±0.5°C, not more than1111111111111
20The strength of the film at the impact on the device Y-1 And, see, not less than50505050505050505050505050
21Adhesion of the film, points111111111111
22Resistance to temperature
(600±5)°C, h, not less than
3333333333333
23Resistance to alternate action of heat at a temperature (600±5)°C and distilled water, cycles, not less than555 5555555555
24Resistance to static action of liquids heating at a temperature of 600±5)°C, h, not less than
25- distilled water100100100100100100100100100100100100100
6 petrol (brand nefras C2-80/120)48484848484848484848484848
27industrial oil48484848484848484848484848

Composition for heat-resistant coating containing a silicone resin-based methylphenylsiloxanes, the polymer of butyl methacrylate, pentaftalevyh varnish, heat-resistant pigment, micronized filler, thickener, rheological additive-bentonite clay and an organic solvent, characterized in that as the silicone resin contains methylphenylsiloxane resin on anoverwhelming General formula:
[Ph-nSiO4-n]a[Rm'SiO4-m]b[Rk2SiO4-k]c;
where n, m, k=1,2; R'=Me, H;
a=0,1-33; R2=Me,
b=0,03-1;
c=0-0,1;
in the following ratio, wt.%:

Specified methylphenylsiloxane resin3,5-13,0
Pentaftalevyh lacquer3,0-14,5
The polymer of butyl methacrylate5,0-7,0
Heat-resistant pigmentof 10.5 to 15.0
Filler8,0-13,0
Thickener1-2
Rheological additive1-2
Organic solvent rest



 

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