RU2180673C1 - Coating composition - Google Patents

Abstract

FIELD: polymer coatings. SUBSTANCE: composition for protective and ornamental coatings for woodwork, metal surfaces, machine parts, and devices operated indoor, outdoor, and under corrosive conditions contains, wt %: butyl rubber modified by kaolin at weight ratio (43-45):(55-57), 46-58; diethylene glycol, 0.5-3.5; flotation reagent oxal, 0.1-1.0; water, 0.5-2.5; metallic stabilizer, 2-4; filler, 20-40; mat additive, 0.2-1.0; pigments, 5-35; organic solvents, the balance. Film is characterized by impact strength 6.5-10 J and temperature tolerance 40-48 cycles at temperature between +45 and -45 C. EFFECT: improved working characteristics of coatings. 2 tbl

Description

 The invention relates to paints and varnishes, and in particular to the field of development of enamel compositions intended for protective and decorative coatings made of wood, metal surfaces of machine parts, devices operated indoors, in atmospheric conditions and aggressive environments.

Known composition for coating according to A.S. 1031998, including butyl rubber, plasticizer - tall oil and pentaphthalic varnish PF-064, stabilizer - a mixture of primary aliphatic amines C ₁₇ -C ₂₀ , filler, pigments and organic solvents, in the following ratio, wt. hours:
Butyl rubber - 100
Tall oil - 27.0
Pentaphthalic varnish PF-064 - 6.0
A mixture of primary aliphatic amines C ₁₇ -C ₂₀ - 1.5-8.4
Filler - 666-748
Pigments - 435-655
Organic Solvents - 898-1510
The disadvantage of this composition for coating is that it has insufficient impact strength of 5 J.

Closest to the technical nature of the proposed composition is the "Composition for coating" according to patent 2118644, IPC C 09 D 123/22, including butyl rubber, epoxy-diane resin (plasticizer) grade 7D-20, zinc stearate (metal stabilizer), filler, Aerosil A-380 (matting additive), pigments and organic solvents, in the following ratio, wt. hours:
Butyl rubber - 100
Epoxy-dianovy resin ED-20 - 3.2-9.5
Zinc Stearate - 4.0-10.8
Filler - 260-410
Aerosil A-380 - 1-3
Pigments - 56-223
Organic Solvents - 490-650
The disadvantage of this composition for coating is that it has insufficient impact strength - 5-6 J and insufficient film resistance to variable temperatures from +45 to -45 ^o C, only 10 cycles.

The objective of the invention is to provide a coating composition having increased film resistance to impact and high resistance of the film to variable temperatures from +45 to -45 ^{° C.} while maintaining the values of the remaining parameters of the composition for coating.

The problem is achieved in that the coating composition, including butyl rubber, pigments, filler, plasticizer, metal stabilizer, matting additive and organic solvents, contains kaolin-modified butyl rubber at a weight ratio of (43-45) :( 55-57) and as a plasticizer contains flotoreagent-oxal, diethylene glycol and water, in the following ratio, wt. %:
The kaolin-modified butyl rubber, with their mass ratio (43-45) :( 55-57) - 40-58
Pigments - 5.0-35
Filler - 20-40
Flotoreagent-oxal - 0.1-1.0
Diethylene glycol - 0.5-3.5
Water - 0.5-2.5
Metal-containing stabilizer - 2.0-4.0
Matting additive - 0.2-1.0
Organic Solvents - Else
In the proposed paint composition use:
1. As a polymer binder - butyl rubber brands "BF", 1675 Ni1570C, TU 36-103167-89 and TU 2294-034-05 766801-95.

 2. The modifying additive is kaolin, GOST 19608-84, GOST 21285-75 and TU 21-5494310-001-92.

3. As a plasticizer are used
- flotation reagent-oxal brand T-66, T-92 according to TU 2452-029-05766801-94;
- diethylene glycol according to GOST 10136-77;
- water, GOST R 51232-98.

4. As a metal-containing stabilizer are used:
- zinc stearate according to TU 6-09-17-257-88, TU 6-09-17-262-88, TU 6-09-17-279-90;
- calcium stearate according to TU 6-22-05800185-722-83, TU 6-09-4104-87.

5. As a filler are used:
- talcum grades TK-1, TRPN according to GOST 13145-85, GOST 19729-74;
- powdered quartz in accordance with GOST 9077-82;
- limestone flour in accordance with GOST 14050-78;
- chalk, GOST 12085-88 and TU 21-020860-06-92.

6. As a matting additive are used:
- Aerosil grades A-175, A-300, A-380 according to GOST 14922-77;
- white soot, GOST 18307-78.

7. Pigments:
- titanium dioxide grade R-02 according to GOST 9808-84;
- iron minium according to GOST 8135-74;
- dry ocher grades 0-2, TU 301-10-019-90;
- chromium oxide grade OHP-1, OHP-11, GOST 2912-79;
- iron blue, GOST 21121-75;
- pigment blue phthalocyanine brand 23U according to TU 6-36-05011400-17-92;
- scarlet pigment, GOST 8567-73;
- pigment red iron oxide brand KO-1, K, K-2, TU 6-10-602-86;
- pigment yellow iron oxide grades Zh-0, Zh-1, Zh-2, GOST 18172-60;
- green pigment grade "O" according to TU 6-38-05800-142-82-0-92;
- carbon technical grade K-354, GOST 7885-86;
- varnish Bordeaux "SM" TU 6-14-240-80.

8. Organic solvents:
- butyl alcohol, GOST 5208-81;
- coal toluene, GOST 9880-76;
- white spirit, GOST 3134-76;
- Nefras, TU 38-101-1026-85.

 To ensure the possibility of loading butyl rubber onto technological equipment (mixer, reactor), uniformly distributing it by volume in the mixture of components, and reducing the dissolution time in a solvent, butyl rubber briquettes weighing 30 kg must be crushed to a size of no more than 12 mm. Unmodified crushed butyl rubber sticks together and forms briquettes again. Modification of butyl rubber by kaolin with their weight ratio (43-45): (55-57) obtained experimentally provides grinding of rubber particles to the desired size, saves these sizes during storage and solves the problem of the invention. With a weight value of kaolin less than 55 wt. % butyl rubber sticks together, and more than 57 wt.% - kaolin does not have a modifying effect.

Concrete example
First stage. Modification of butyl rubber with kaolin. Butyl rubber briquettes weighing up to 30 kg are preliminarily cut with a knife blade into pieces of arbitrary shape with a size of 200 x 300 x 150 mm.

Butyl rubber and kaolin are simultaneously loaded onto rollers with a corrugated surface of barrels working with a 1: 1.27 friction at a mass ratio of (43-45): (55-57) 3-5 minutes at a roll temperature of 60-75 ^o C. Rolled mass pushed through the holes of the forming rings and cut off with circular knives on tablets of arbitrary shape.

Second phase. Obtaining dried rubber composition. In a mixer of type СМ-400 without heating, 40 wt.% Of kaolin-modified butyl rubber, 0.1 wt.% Of flotation reagent-oxal, 0.5 wt.% Of diethylene glycol, 0.5 wt. % water, 2 wt.% calcium stearate, 20 wt.% talc, 0.2 wt.% Aerosil and 5.0 wt.% pigments for 30-35 minutes. The mixture is treated on rollers with a corrugated surface of barrels operating with a friction of 1: 1.27, at a temperature of 75-80 ^o C for 3-5 minutes and, forcing through the holes of the forming rings, get a tablet with a thickness of 12 mm dry-rolled rubber composition.

 The third stage. Obtaining a composition for coating. The coating composition is prepared according to generally accepted technology in a mixer with a rotary-jet or paddle mixer by dissolving the dried rubber composition in organic solvents with stirring for 30-60 minutes at room temperature.

 The coating composition is applied to a clean, dry surface with a brush, roller, pneumatic sprayer, in bulk.

 Table 1 shows examples of specific performance of the component composition for coating.

Table 2 shows the properties of the composition for coating in comparison with the known composition. From table 2 it is seen that the composition for coating according to the invention has a high impact strength of the film of 6.5-10 J and a high resistance of the film to variable temperatures from +45 to -45 ^o C (40-48) cycles while maintaining the values of other indicators composition for coating.

Claims (1)

Composition for coating, including butyl rubber, pigments, filler, plasticizer, metal stabilizer, matting additive and organic solvents, characterized in that the composition contains kaolin-modified butyl rubber at a weight ratio of (43-45): (55-57) and in as a plasticizer contains flotation reagent-oxal, diethylene glycol and water in the following ratio, wt. %:
The kaolin-modified butyl rubber, with their mass ratio (43-45): (55-57) - 40-58
Pigments - 5.0-35
Filler - 20-40
Flotoreagent-oxal - 0.1-1.0
Diethylene glycol - 0.5-3.5
Water - 0.5-2.5
Metal-containing stabilizer - 2.0-4.0
Matting additive - 0.2-1.0
Organic Solvents - Else

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