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Surface Finishing Tutorial

#179 Paint Types - 7

Category : Painting
February21, 2014

(12) Vinyl resin paint

This type can be roughly classified into "solution based paints" that use resin solutions as vehicles, and "sol-type paints" that use powdered resins as plasticizer (also with small amounts of solvents). The common characteristics of the coatings are corrosion resistance and especially good alkali resistance. The workability and adhesion are not very good requiring proper primer coatings.

(1) Polyvinyl chloride acetate resin paint

This is a thermoplastic resin solution based paint with copolymer resins of vinyl chloride and vinyl acetate, normally containing 9~15% of vinyl chloride.
This resin dissolves well in a mixture of aromatic hydrocarbons such as ester and ketone. The coatings have excellent water resistance, oil resistance and chemical resistance. but does not have good pigment dispersibility, having high viscosity with poor workability and build-up characteristics.
It is often used as chemical resistant painting on factory equipment, tanks, interior and exterior coatings of pipes, anti-corrosion coatings on mechanical tools, ship bottom coatings, and strippable coatings.

(2) Vinyl-sol paint

The vinyl-sol paint is a paste like paint with vinyl chloride resin fine powder dispersed and suspended in a plasticizer or plasticizer + small amount of solvent.

The type dispersed in a plasticizer is called "Plastisol", and the type dispersed in a plasticizer + solvent is called " Organosol". When these are heated to 170~200°, the resin particles fuse together to form the coatings.

1. Since its non-solvent nature, a single coating application of plastisol attains several mm, organosol attains several 1/10 mm layer thickness conventionally unobtainable.
2. The thick coatings have excellent corrosion resistance and chemical resistance.
3. Excellent in mechanical, chemical, and electrical properties. High baking temperature.
4. Special painting procedures are required since viscosity cannot be freely adjusted.

Applications are...

1. Roll coating and immersion coating of wrapping paper and fabric as waterproofing.
2. Possible to apply embossing and printing on steel and aluminum plates giving leather and cloth like textures with Soundproofing effects. Such painted metal plates are widely used for electrical equipment, construction material, office equipment, metal furniture, vehicles, ship vessels.
3. Decorative painting such as wrinkle finish can be obtained by simply spraying.
4. Widely used on other applications such as on shipping vessel coatings, and strippable (coatings that can be stripped) paints.

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