Heat-resistant paint

 

(57) Abstract:

Usage: protection components and structures of ferrous and non-ferrous metals, operated in the temperature range from -40°C to +550°C. the Essence, paint includes, %: polyphenylsiloxane butanediamine resin direct synthesis of 20 - 22, a copolymer of methyl methacrylate with methacrylic acid, 13 - 29, aluminium powder 12 - 18, Aerosil 3 - 7 and the solvent 36 - 40. Resistance to alternating action temperature -40 to +550°C 10 cycles. table 2.

The invention relates to paints, varnishes and lacquers based on silicone resins, designed to protect components and structures of ferrous and non-ferrous metals, operated in the temperature range from -40aboutC to +550aboutC.

Known conductive composition containing polymethylsiloxane liquid zinc oxide, aerosol, aluminium powder, copolymer of butyl methacrylate and methacrylic acid [1] This part is used only in the electrotechnical industry in obtaining a discharge current sources and can withstand temperatures up to +400aboutC. However, this structure cannot be used to protect metal products, operated in the temperature range from -40about[2]

The disadvantage of this paint is used as a film-forming methylphenylsiloxane resin not forming at a temperature of 150-250aboutWith reliable mesh patterns (knitting), which destruction occurs at temperatures above 250aboutC. in Addition, the coating on the basis of this paint dry only at elevated temperatures (above 100aboutC).

Technical problem on which this invention is directed, is the extension of temperature range of operation of the paint coating -40aboutC to +550aboutC. This task is achieved in that the heat-resistant paint, including polyphenylsiloxane resin, aluminum powder and aerosol, as polyphenylsiloxane resin contains polyphenylsiloxane butanediamine resin direct synthesis and further comprises a copolymer of methyl methacrylate with methacrylic acid and solvent at the following sootnoshenie is relate methacrylic acid 13-29 Aluminum powder 12-18 Aerosil 3-7 Solvent 36-40

The paint is prepared as follows.

In disolver download polyphenylsiloxane resin (TU 6-02-1-581-88) and include the stirrer. Then enter a copolymer of methyl methacrylate with methacrylic acid (TU 6-01-1305-85) and solvent (GOST 1.928-79). Everything is thoroughly stirred for 15 min and slowly DeGroat Aerosil A-300 (GOST 14922-77). Again stirred for 40 min to swell Aerosil, then slowly load aluminum powder (GOST 5494-71). Mixing of all components is carried out for 30 minutes, the Paint is ready to use. Paint Packed in cans, jars, drums. The paint is applied by electrodeposition, spray gun or a brush to clean and fat metal surface in one or two layers depending on the conditions.

Examples of specific ratios of components are given in table. 1.

In table. 2 shows the test results of the coatings based on different formulations of paint. As seen from the above table. 2 data are optimal compositions of paint (1-3) containing, by weight. polyphenylsiloxane resin 20-22; a copolymer of methyl methacrylate with methacrylic acid, 13-29, Aerosil 3-7, aluminum powder 12-18, solvent 36-40.

Tested for resistance to alternating temperature also showed that the content in the paint polyphenylsiloxane resin in the amount of < 20% (composition 4) 2-3 cycle leads to peeling of the coating. With increased content polyphenylsiloxane resin, more than 22% (7) through 12 cycles of hardening in water is observed cracking, and at a temperature of 600aboutWith over 6 hours and alternating temperatures in the range -40aboutC to +550aboutWith over 8 cycles warping coverage.

The optimum content of the copolymer of methyl methacrylate and methacrylic acid in the paint 13-29% of the solvent 36-40% As the increase of their content (compounds 9, 13), and the reduction of their content (compounds 8, 12) in 3-6 cycles, the impact of variable temperatures leads to peeling of the coating.

After 4 h of incubation at a temperature of 600aboutSince there is peeling of the coating, if the content of the solvent does not match 36-40% (compounds 12, 13).

Slight peeling of the coating through 5-9 calastia temperature 600aboutWith the warping. The introduction of Aerosil more than 7% (11) contributes to the viscosity of the ink, which leads to technological difficulties in obtaining paint with the desired parameters. In addition, after 8 h exposure to temperatures of 600aboutWith the coating peeling, and at alternating temperatures of the coating does not change the appearance and quality.

When the content of the aluminum powder is above the upper limit (5) after 10-15 cycles of the alternating influence of temperature coating remains intact. But the increase in the content of the aluminum powder and the decrease of aerosol paint (part 10) leads to a decrease sedimentation stability (observed accelerated deposition of aluminum powder).

The introduction of the aluminum powder is less than 12% (6) leads to peeling of the coating after 10 cycles quenching in water from a temperature of 550aboutS, through 8 cycles of alternating exposure to temperatures in the range -40aboutC to +550aboutWith the cracks, and temperature 600aboutC and 700aboutWith coatings cannot withstand. Temperature 700aboutWith no stand cover-based compounds 4, 6-13, and a temperature of 600aboutWith coverage on the basis of compounds 4, 6, 8, 9.

In addition to the above D. what is cold or hot drying, when natural drying forms a beautiful silver decorative coating, hot decorative and heat-resistant.

The application of paint eliminates the need for priming the protected surfaces other coating materials, delivered to the consumer in working process of painting the parameters applied in any way (brush, roller, spray gun). High specific volume resistance of paint (21073108smsm) allows you to apply it using the electroplating method on parts and products of all sizes and configurations.

Heat-RESISTANT PAINT, including polyphenylsiloxane resin, aluminum powder and aerosol, characterized in that as polyphenylsiloxane resin it contains polyphenylsiloxane butanediamine resin direct synthesis and further comprises a copolymer of methyl methacrylate with methacrylic acid and solvent in the following ratio, wt.

Polyphenylsiloxane butanediamine resin direct synthesis of 20 - 22

Copolymer of methyl methacrylate with methacrylic acid 13 29

Aluminum powder 12 18

Aerosil 3 7

The solvent 36 40

 

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