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    Home > Coatings News > Paints and Coatings Market > Anti-powder coating clumping method

    Anti-powder coating clumping method

    • Last Update: 2020-03-26
    • Source: Internet
    • Author: User
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    powder coating has the tendency to clump at a certain temperature, which is mainly caused by the thermal softening of the resin, leveling agent and other materials in the powder coatingDifferent resins have different glass temperatures, such as epoxy resin and polyester resin glass temperature of about 50 degrees Celsius, the glass temperature of the photopromoter (701) is about 30 degrees Celsius, and the liquid leveling agent glassdegree is at minus zero degrees CelsiusThe higher the addition of the material at the low glass temperature in the powder coating formulation, the lower the glass temperature of the systemDetermining the glass temperature needs to have a special large-scale instrument, the general powder coating manufacturer does not have this more expensive instrument equipment, we can not grasp the powder system glass temperature in a timely manner, therefore, in the production of the powder system glass temperature positioning is about 40 degrees Celsius, this temperature is set as the powder coating block safety temperatureThen in the production (and product storage and transportation process) as a standard, close to and above this temperature when the relevant personnel to strengthen the product clump samplingNow into the summer production stage, the temperature increase will be more easily the occurrence of powder coating product shard problems, so how to prevent powder coating clumps at work?first of all, to establish a concept: powder coating at a certain temperature clumps is a natural lawTo prevent powder coating clumps, powder coating products are below their glass temperature in the whole process of grinding, packaging, storage, transportation, etcin powder coating productionaccording to this view, there are the following solutions:1) in the production of polyester resin, the use of some can improve its glass temperature of alcohol or acid, or reduce the use of alcohol can reduce the temperature of the resin to improve the glass temperature of polyester resin2) Reduces the use of low-glass-temperature polymers, such as leveling agents and photonizers, in powder coating formulation design to ensure that the glass temperature of the powder coating system does not decrease3) production, the steel strip down the broken sheet material should be fully cooled before entering the grinding process, grinding powder should be appropriate to reduce the feed speed, increase the air lead, imported air-filled air conditioning to control the grinding temperatureHowever, if the pre-grinding pre-grinding chip cooling does not come, then the latter means will not play a very good role, can consider the crushing chip forced cooling method for low temperature treatment, which is more effective than the addition of air conditioning, anti-clump additives can be added, such as nano-silicon dioxide (VK-SP15) or nano-aluminum trioxide (VK-L20M) micro-powder to prevent adhesion between powder particles, anti-clumps generally and broken pieces at the same time grinding effect is bestnano-aluminum trioxide (VK-L20M), nano-silicon dioxide (VK-SP15) use range:1 Thermoset powder coating: epoxy resin line, polyester line, acrylic resin line Examples of epoxy powder coatings, polyester powder coatings, acrylic powder coatings, etc 2 Thermoplastic powder coatings: thermoplastic powder coatings include: polyethylene, polypropylene, polyester, PVC, chlorinated ether, polyamide system, cellulose, polyester Examples of PVC powder coating, polyethylene powder coating, nylon powder coating, fluorine resin powder coating, latex powder coating and other nano-aluminum trioxide (VK-L20M) use characteristics: nano-aluminum trioxide (model VK-L20M) used in powder coatings, can improve the fluffyness of powder coatings, anti-block effect For powder coatings used in high temperature and humidity environments, good storage The addition is generally 0.2-0.5%, nano-aluminum trioxide can improve the live performance of the powder, especially when using frictional charged spray, can significantly improve the powder powder rate and solve the problem of dead end, while the gloss of the powder coating has no effect use any single method can not effectively prevent the formation of powder coatings, overuse of one method can bring other ills to powder coatings Scientific cooperation using a variety of methods can effectively prevent the blocking of powder coatings Source: China Epoxy Net "
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