Composition for anti-corrosion coatings

 

(57) Abstract:

The invention relates to compositions for anti-corrosion coatings with the use of a copolymer on the basis of the bottoms of the distillation of styrene copolymer KORS), and is intended primarily for the protection of metal (including steel) structures operated at the temperature of the metal surface to +150oC. the Composition comprises, in wt.%: the copolymer based on the bottoms of the distillation of styrene 8 - 11; polyvinyl chloride 11 - 13, cyclohexanone 27 - 29; polystyrene 4 - 6; sesquioxide antimony 4 - 6; filling 8 - 10; pigment 5 - 7; xylene - rest. At relatively small cost of coverage not less than 1.5 times smaller than those currently used for the same purpose coatings with the same properties, the proposed coating keeps unchanged appearance and protective properties for a very long time by providing components of the barrier and adhesion mechanism of the protective action of the coating in the presence of a temperature stabilizer. 3 table.

The invention relates to compositions for anti-corrosion coatings with the use of a copolymer on the basis of the bottoms of the distillation of styrene copolymer KORS) and the temperature of the metal surfaces to +150oC.

Known composition for corrosion-resistant coating comprising a copolymer based on a bottoms distillation styrene copolymer KORS) as a foaming agent, policrystalline, plasticizer, asbestos as filler, xylene as the organic solvent /1/.

Coatings based on this composition have a relatively small value, the upper limit of the temperature range of application until the surface temperature of +70oC.

Known composition for corrosion-resistant coating comprising a copolymer based on a bottoms distillation styrene copolymer KORS) as a foaming agent, plasticizer, asbestos as filler, xylene as the organic solvent, the copolymer based on oligomers of butadiene with methyl methacrylate /2/.

The disadvantage is that at relatively small cost of the coverage it has an upper limit of the range of application to surface temperature +70oC.

Closest to the technical essence, adopted as a prototype, is a composition for corrosion-resistant coating comprising a copolymer on the basis of the bottoms reflectivities and polymerized unsaturated compounds pyrolysis liquid and gaseous petroleum fraction C8-C9-resin SPP 9-14 /3/.

The advantage of the composition is relatively low cost coverage. The disadvantage is that the coating has the upper limit of the temperature range of application until the surface temperature of +70oC.

The task, which directed the claimed invention is to provide a composition that provides the extended temperature range of application of the coating to the surface temperature of +150oC while keeping costs low in comparison with the currently used compositions for coatings with similar properties.

The problem is solved as follows. According to the claimed invention, the composition for corrosion-resistant coating comprising a copolymer on the basis of the bottoms of the distillation of styrene, xylene, pigment, filler, has a distinctive essential features in the new essential features, namely the composition further comprises polyvinyl chloride, cyclohexanone, polystyrene and sesquioxide antimony in the following ratio, wt.

The copolymer based on the bottoms of the distillation of styrene 8-11

Polyvinyl chloride 11-13

Cyclohexa the aspects of

Polyvinyl chloride which introduced the solvent is cyclohexanone) and polystyrene in the presence contained in the coating sesquioxide antimony provide confident at temperatures up to +150oC predominantly barrier mechanism of the protective action of the coating, and the adhesion mechanism of the protective action of the coating at temperatures up to +150oC in the presence of sesquioxide antimony provides mainly the copolymer based on the bottoms of the distillation of styrene, thus, the proposed floor have a mixed mechanism of the protective action, gives the greatest and long-term protective effect, while a small value of the coating, not less than 1.5 times smaller than those currently used for the same purpose coatings with the same properties.

As a copolymer on the basis of the bottoms of the distillation of styrene using a polymerization product of a joint VAT residue of the distillation of styrene with acid anhydrides (maleic anhydride) (GOST 11153-75).

Polyvinyl chloride product of the radical-chain polymerization of vinyl chloride with a degree of polymerization of 100-2500, the composition may be used polyvinyl chloride PVC-66026 (HOST-78).

Cyclo is>/P>The polystyrene polymer, a polymerization product of styrene (GOST 20289-84).

Sesquioxide antimony (TL6-09-32-67-84) is known as thermo stabilizer of plastics.

As filler can be used talc powder for paint industry (TU 21-25-201-77), mica Muscovite ground (GOST 855-74).

As the pigment may be used titanium dioxide pigment (TU 6-10-1650-85), zinc (GOST 202-84), red iron oxide (GOST 8135-74), pigment yellow zheleznodorolny (GOST 18172-72), pigment red zheleznodorolny (TU 6-10-602-74).

Xylene oil (GOST 9410-78) an organic solvent.

The composition for anti-corrosion coatings are produced by first the formation of two solutions: first, taken in prescription quantities of powdered polyvinyl chloride prescription number cyclohexanone, second, taken in prescription quantities of granulated polystyrene prescription number of xylene, and then mix these solutions simultaneously with the copolymer based on the bottoms of the distillation of styrene, taken in prescription number, until a homogeneous film-forming base composition, and then mixed with prescription courney mill to the required milling degree, then filtered and poured into containers.

The surface composition is applied by brush, spray gun or roller.

The tests were carried out as follows.

For definitions of indicators: the appearance of the film, elasticity, adhesion, hardness of the coating film and the heat resistance of the film at a temperature of +150oC preparation of test samples for the tests were carried out according to GOST 8832-76. On the steel samples of low carbon steel Art.3 sizes HH,8 mm using the paint was applied the following compositions: known composition prototype options and composition the proposed composition, in a single layer, followed by drying for 2 hours at 60-65oC. the film Thickness after drying was 30 μm.

The appearance was determined after cooling visually with diffused light. The definition of the elasticity of the film produced according to GOST 6806-78, the diameter of the rod on a scale of flexibility 1 mm, the hardness of the films produced according to GOST 5233-89 on a glass plate. Determination of adhesion was carried out according to GOST 15140-78.

The heat resistance of the coating film at a temperature of +150oC was determined by placing the plate with the applied and dried coating to thermostat, having the temperature and examined in daylight.

The invention is illustrated by the following examples of specific performance (see table. 1) and a performance test (see tab. 2) appearance of the coating film, elasticity, adhesion, hardness. The indicators in testing resistance of the coating film at a temperature of -150oC are given in table. 3.

The sources of information.

1. USSR author's certificate N 905245, M CL C 09 D 5/08, C 09 D 3/733, publ. 15.02.82, bull. N 6.

2. USSR author's certificate N 1502593, M CL C 09 D 5/08, publ. 23.08.89, bull. N 31.

3. USSR author's certificate N 1726485, M CL C 09 D 5/28, CD 4 41/61 B, publ. 15.04.92. bull. N 14 (prototype).

Composition for corrosion-resistant coating comprising a copolymer on the basis of the bottoms of the distillation of styrene, xylene, filler, pigment, characterized in that it further contains polyvinyl chloride, cyclohexanone, polystyrene and sesquioxide antimony in the following ratio, wt.

The copolymer based on the bottoms of the distillation of styrene 8 11

Polyvinyl chloride 11 13

Cyclohexanone 27 29

Polystyrene 4 6

Sesquioxide antimony 4 6

A filler 8 10

Pigment 5 7

Xylene Ostalnoe

 

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