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How to avoid agglomeration of powder coatings effectively?

Author: Addtime:2022-06-15 15:48:36 Click:75

Powder coatings have a tendency to agglomerate at a certain temperature, which is mainly caused by the softening of the resin and leveling agent in the coating process.

According to this idea, the technical department of our company adopts the following solutions: 1. In the production of polyester resin, select some alcohols or acids which can improve its glass transition temperature, or reduce the amount of alcohols which can reduce the glass transition temperature of the resin to improve the glass transition temperature of the polyester resin. 2. Reduce the amount of polymer used in the formulation of Powder coatings, such as leveling agent and brightener, to ensure that the glass transition temperature of the coating system will not decrease. 3. In production, the crushed fragments from the steel strip should be fully cooled before entering the grinding process. When grinding, the feeding speed should be properly reduced, the air volume should be increased, and the air inlet should be equipped with air conditioning to control the grinding temperature. However, if the crushed debris can not cool down before grinding, then the back of the method will not play a very good role, can consider the crushed debris forced cooling method of low temperature treatment, which is more effective than adding air conditioning.

Powder coating additives, also known as powder additives, are mostly evolved from coatings or plastic additives, and are mostly solid in shape. Although there are fewer kinds of additives in Powder coatings than in traditional liquid coatings, with the continuous development of coating skills, the types and functions of additives are also increasing. Different kinds of coatings require different kinds of auxiliaries. An excellent type of paint additives must have the following conditions at the same time: less dosage and obvious effect, physical and chemical function stable, do not affect the coloring or other functions, increase convenience, good dispersibility, low toxicity and even non-toxic, price appropriate.