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As early as the Shang Dynasty, China had taken down natural lacquer decorative appliances, palaces and temples from lacquer trees. By the Spring and Autumn Period, we had mastered the technology of refining tung oil to make coatings. In the Warring States Period, we could use raw paint and tung oil to mix coatings. The technology of using additives in coatings promoted the development of coatings to a new era.
The tough and protective film of lacquer coffins and lacquerware unearthed from the Han Tomb at Mawangdui in Changsha fully shows the maturity of the development of the use of raw lacquer technology in China in the 2nd century BC. As a result of the application of tung oil and lacquer, the customary name of "paint" has been handed down.
In the last century, the major achievements in the theory of polymer science and the successful development of various polymer compounds were put into production, which has developed a new era for paint. In the 1920s, alkyd resin used as film forming material of coatings was successfully developed. Since then, various newly developed synthetic resins have been quickly applied in coatings, making coatings enter an era dominated by synthetic film forming materials.
Nitrocellulose varnish. Nitrocellulose varnish is a kind of transparent paint made of nitrocellulose, alkyd resin, plasticizer and organic solvent. It belongs to volatile paint and has the characteristics of fast drying, soft luster, etc. Nitrocellulose varnish is divided into high gloss, semi matt and matt, which can be selected according to needs. Nitrocellulose paint also has its disadvantages: it is easy to whiten in high wet weather, low fullness, and low hardness
1. Phenolic paint has fast drying, high hardness, water resistance, abrasion resistance, but is brittle and prone to yellowing.
2. Nitrocellulose paint is wax gram, which is fast in drying, hard in film, wear-resistant and clear in wood grain, but poor in film fullness.
3. Alcohol ester paint is easy to construct, firmly attached, bright and plump, and is commonly used for painting outdoor wood products, such as doors and windows, railings, and steel structures. However, its film is relatively soft and has poor water resistance, so it is not suitable for floor and desktop.
4. The advantages of unsaturated polyester paint are good fullness, fast drying speed, and suitable for industrial production line.
5. Polyamine ester paint has excellent hardness, toughness, wear resistance and strong decorative property, but contains TDI.
One of the directions of applying nanotechnology to the industrialization of traditional wood paint industry, the technical difficulty lies in the stability of product molecular structure
1. Nano wood paint is made of high-tech nano materials and curing agent, with good leveling, workability and environmental protection.
2. High solid content, high effective film-forming material and large unit painting area.
3. Nano wood primer has good filling property and strong covering power of white primer; The white top coat has a full film, delicate texture, strong yellowing resistance and has been tested; The varnish has high transparency and transparent paint film.
4. In particular, nano wood paint can degrade decoration pollution, decompose benzene, aldehyde, VOC and other harmful organic substances, purify air, and have health care functions for human body.
fold
Wood coatings in China are mainly used in two fields, one is for furniture manufacturers, the other is for interior decoration, that is, furniture paint and home decoration paint; According to different use places of wood products, they can be divided into the following types.
1. Wooden furniture: the main application field of wood coatings, mainly in factory production and application, is the competitive place for Chinese wood coatings manufacturers.
2. Interior decoration: manual brushing is the main construction method, accounting for a considerable proportion in the market sales, and it is a competitive field for medium and low-grade paint manufacturers.
3. Wood flooring: it is the application field of wood coatings after the factory production of wood flooring, mainly light curing coatings.
4. Wooden toys: mainly opaque coating, and the main quality indicator is that the heavy metal content cannot exceed the standard.
5. Pencil paint: It is a kind of wood paint with opaque finish. In addition to quick drying, the content of heavy metals should not exceed the standard.
6. Outdoor wood products: mainly refer to chairs and other wood products used in parks, swimming pools, beaches and other places, which are required to have a certain weather resistance.
