Résumé : |
How some properties of plastics, such as wear resistance and ageing resistance are weak so coatings are used to improve the applicability of the plastics. The advancement of waterborne coatings in plastics is reviewed.
Plastic products have been more and more widely used and has become one of the indispensable important materials in many fields with the rapid development of the plastics industry. However, some properties of the plastics, such as wear resistance and ageing resistance are weak. Thus, coatings are used to improve the applicability of the plastics in all aspects, which are coated on the surface. At present, coatings, such as single-component thermoplastic acrylic coatings, two-component solvent polyvinyl chloride acrylate coatings, chlorinated polyolefin coatings and nitrocellulose coatings have been used to modify the plastic products.
However, some above used coatings belong to the solvant plastic coatings, which contain some organic solvents, such as benzene, alcohols and hydrocarbon or oxygen solvent in the process of production. The organic solvants are harmful to the environment and human body due to their initial formaldehyde, aromatic and all kinds of harmful volatile substances. Furthermore, some plastic products cannot resist the organic solvents". Thus, more and more attention has been paid to the waterborne plastic coatings, which are friendly to the environment. Waterborne coatings are based on water soluble resins or different types of dispersion resins. Usually, they are composed of different kinds of waterbased resins, pigments, extenders and additives. In this paper, the advancement of waterborne coatings in plastics is reviewed. |