1. How to choose wood surface coating?
Most of the coatings used for wood furniture are transparent varnishes, which are clear and transparent and can reveal the original wood grain. There is also a small amount of opaque paint. The coating should be flat or glossy, and should not irritate the eyes in the sun, but it should be plump and thick. The specific quality requirements are:
①The varnish can show the original pattern of the wood itself and protect the beauty of the wood;
② After the coating is dried, it will not shrink or crack at low temperature, and it is required not to stick back under hot conditions ;
③ Water resistance, wear resistance, strong adhesion (adhesion testing instrument: adhesion Tester);
④ Good gloss, light color, good gloss retention, can be polished and waxed.
Generally, shellac varnish is used for coating on the surface of wooden furniture, floors, musical instruments or as a closed coating of oily varnish.
Generally, indoor wooden doors and windows and ordinary furniture use relatively cheap phenolic varnishes.
High-grade hardwood furniture, violins, pianos, sewing machine tops, radios, and TV casings are made of nitro wood varnishes with good dryness and bright gloss, and acid-cured amino varnishes.
Polyester varnish, unsaturated polyester varnish, acrylic wood varnish, etc. are used for sports floor, high-grade wood and instrument wooden box that require wear resistance.
2. How to choose surface coatings for light industry, household appliances and metal equipment?
Light industry and household appliances, metal equipment, mainly steel, special iron, aluminum, tinplate, gold, silver, copper, tin.
The paints for sewing machines and bicycles are still dominated by black asphalt baking varnishes. In order to improve the fullness of the paint film, reduce the baking temperature and increase the color, in addition to using synthetic amino baking varnishes, high-solid acrylic baking varnishes and oil-free baking varnishes can also be used. poly cool paint and so on. Light and small bicycles mostly use base or acrylic metal interior light paint and multicolored paint.
Some household electrical appliances such as washing machines, refrigerators, electric fans, etc., currently mostly use amino baking varnish. In order to save energy and protect the environment, it is advisable to use acrylic polyurethane catalyzed self-drying paint and water-soluble acrylic baking paint.
For the inner wall of some household appliances, flame-retardant inner wall paint should be used; for household micro motors, odorless motor paint should be used.
Toys, stationery, clocks, lamps, thermos bottles, etc. need to use lead-free, antimony, chromium, cadmium and other toxic heavy metal pigments.
Steel pipe instruments should use acrylic or polyurethane varnish, gold and silver jewelry and high-grade metal decorations, in order to prevent discoloration and silver from being blackened by hydrogen sulfide, acrylic cathodic electrophoretic varnish should be used. The paint can not only maintain the inherent color and feel, but also has a certain touch resistance.
The inner wall coating of food cans should be made of epoxy phenolic aldehyde as the main component, sometimes adding a certain amount of zinc oxide and tin powder; No yellowing underneath. As for flexible packaging and aluminum foil packaging, UV-curable coatings should be used.
In order to make the surface of metal equipment smooth and clean, in addition to ensuring the quality of the topcoat and the corresponding variety, primers and putty matching the topcoat should be used.
With the development of the economy and the improvement of living standards, people's demand for durable consumer goods tends to be new, strange, special and excellent. Coatings for bicycles have evolved from the traditional anti-rust function to high decorative and anti-rust properties. It is required that the color tone of the paint should be harmonious, fresh and bright, which is refreshing. Therefore, paint factories have all released one after another light, fluorescent, pearlescent and art paints.
