Paste with binders resins used as dispersing pigments formula design how to choose

     Dispersion resin is able to paint uniform dispersion stability of the resin. At the same time,it is also in paint coating is an important part of,is one of the main filmforming material.So,when choosing dispersion resins,coatings engineer should not only consider its wetting dispersibility of the pigment,also want to consider the other properties of the coating:mechanical properties,weatherability,water resistance,chemical resistance,etc.
     In the field of water-based automotive coatings,the current generic water-based dispersion resins,waterborne polyester resin and water-based acrylic resin,and the city to buy goods mainly water-soluble polyester resin.Waterborne polyester resin and waterborne alkyd resin,is through the introduction of hydrophilic groups in the resin,including -COOH,-oH,-o-,etc., or use the form of additional emulsifier was emulsified to waterborne:
     1.Preparation on the long chain of the groups with free polyester main chain,with acid and amino chain (cationic resin) or to achieve water-soluble with alkali neutralization carboxyl (anionic resin).
     2.In resin molecular chain is introduced into a certain number of strong hydrophilic group,such as amino,carboxyl,hydroxyl,ether,amide,etc,the emulsification and dispersion in water.
     3.Plus emulsion polymerization,the emulsifiers or compulsively to resin emulsion formation water dispersible emulsion.
     Sometimes several ways and at the same time,in order to improve the water dispersion and water dispersion stability.

By Nicole