Common knowledge of coating: how to avoid agglomeration of powder coating

It is suggested that powder coatings tend to agglomerate at a certain temperature, which is mainly caused by the softening of resin, leveling agent and other materials in powder coatings 　　 Different resins have different glass transition temperatures For example, the glass transition temperature of epoxy resin and polyester resin is about 50 ℃, the glass transition temperature of brightener (701) is about 30 ℃, and the glass transition temperature of liquid leveling agent is about 0 ℃ The larger the amount of materials with low glass transition temperature is, the lower the glass transition temperature is It is very important to determine the glass transition temperature If there is no measuring instrument, Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Coating home news: powder coating has the tendency to agglomerate at a certain temperature, which is mainly caused by the resin, leveling agent and other materials in the powder coating softened by heat Different resins have different glass transition temperatures For example, the glass transition temperature of epoxy resin and polyester resin is about 50 ℃, the glass transition temperature of brightener (701) is about 30 ℃, and the glass transition temperature of liquid leveling agent is about 0 ℃ The larger the amount of materials with low glass transition temperature is, the lower the glass transition temperature is It is very important to determine the glass transition temperature If there is no measuring instrument, the glass transition temperature of the powder system is located at about 40 ℃, which is the safe temperature for the agglomeration of the powder coating Then in the production (as well as product storage and transportation process) as a standard, when the temperature is close to or higher than this, relevant personnel should strengthen the sampling inspection of product caking If entering the summer production stage, the temperature rise will be more likely to cause the agglomeration of powder coating products, then how to prevent the agglomeration of powder coating in the work? First of all, we should establish a concept: the agglomeration of powder coating at a certain temperature is a natural law In order to prevent the agglomeration of powder coating, the powder coating product must be below its glass transition temperature in the whole process of grinding, packaging, storage, transportation, etc According to this point of view, there are the following solutions: 1) in the production of polyester resin, select some alcohol or acid that can improve its glass transition temperature, or reduce the amount of alcohol that can reduce the glass transition temperature of resin to improve the glass transition temperature of polyester resin 2) In the formulation design of powder coating, the amount of low glass transition temperature polymer, such as leveling agent and brightener, is reduced to ensure that the glass transition temperature of powder coating system will not be reduced 3) In terms of production, the broken pieces on and off the steel belt shall be fully cooled before entering the grinding process When grinding, the feeding speed shall be properly reduced, the air volume of induced air shall be increased, and the air conditioner shall be installed on the inlet air to control the grinding temperature However, if the cooling of the crushed pieces can not be achieved before grinding, the latter means will not play a good role It can be considered that the method of forced cooling of the crushed pieces can be used for low-temperature treatment, which is more effective than adding air conditioning In addition, anti caking additives, such as nano silica (vk-sp15) or nano aluminum oxide (vk-l20m) powder, can be added to prevent adhesion between powder particles Generally, anti caking agent and broken sheet material have the best grinding effect at the same time The application scope of nanometer aluminum oxide (vk-l20m) and nanometer silicon dioxide (vk-sp15): 1 Thermosetting powder coating: epoxy resin system, polyester system and acrylic resin system For example, epoxy powder coating, polyester powder coating, acrylate powder coating, etc 2 Thermoplastic powder coating: thermoplastic powder coating includes polyethylene, polypropylene, polyester, PVC, chlorinated polyether, polyamide, cellulose and polyester For example, PVC powder coating, polyethylene powder coating, nylon powder coating, fluororesin powder coating, latex powder coating and other Nano-Al2O3 (vk-l20m) use characteristics: Nano-Al2O3 (model vk-l20m) used in powder coating can improve the fluffy degree of powder coating, with good anti caking effect For the powder coating used in high temperature and high humidity environment, it has good storage The addition amount is generally 0.2-0.5% Nano-Al2O3 can improve the charged property of the powder, especially when friction charged spraying is used, it can obviously improve the powder loading rate and solve the problem of dead angle, and has no effect on the glossiness of the powder coating Using any single method can not effectively prevent the agglomeration of powder coating Overusing one method will bring other disadvantages to powder coating Only scientific cooperation with many methods can effectively prevent the agglomeration of powder coating Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,