Preparation method of powder coating
A technology of powder coating and paint, which is applied on-site toning. ,PVDF powder is used as the base material in the field of paint coloring, which can solve the problems of high toxicity of aromatic solvents, unfavorable environment and labor protection, low glass transition temperature, and inability to color.
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[0014] The preparation method of the PVDF powder coating of the present invention comprises the step of preparing base material and the step of toning.
[0015] Prepare base
[0016] The method for preparing the base material of the present invention includes mixing 50-80% by weight of PVDF resin, 40-10% by weight of polyacrylate resin and 5-10% by weight of titanium dioxide, granulating, pulverizing and sieving.
[0017] The binder of the present invention comprises 50-80% by weight of PVDF resin, preferably 55-75% by weight of PVDF resin, more preferably 60-70% by weight of PVDF resin, most preferably 62-67% by weight of PVDF resin.
[0018] In an example of the present invention, the molecular weight of the PVDF resin is 1500-8000, preferably 2000-7000, more preferably 3000-5000. The PVDF resin can be purchased from the market, for example, it can be purchased from Shanghai Sanaifu New Material Co., Ltd. under the product name of FR9631.
[0019] The PVDF resin of the pr...
Embodiment 1
[0048] 1. Manufacture base material
[0049] First, 63 kg of PVDF resin (FR9631, Shanghai Sanaifu New Materials Co., Ltd.), 27 kg of acrylate resin (B44, Rohm and Haas) and 10 kg of rutile titanium dioxide (R960, DuPont) were added to the high-speed mixing extruder (SHR, Zhangjiagang Zhenxiong Plastic Machinery Factory) to mix evenly; then, use a co-rotating twin-screw extruder (TDS-30B, Nanjing Nuoda Extrusion Equipment Co., Ltd.) to melt and extrude the powder at a temperature of about 200°C out, the feeding frequency is about 8Hz, and water-cooled granulation; after the particles are dried, use an air-induced pulverizer (Beijing Kunjie Yucheng Machinery Equipment Co., Ltd.) to pulverize the pellets at low temperature in liquid nitrogen, and then use a 200-mesh standard Obtain PVDF powder coating base material (D 50 = 79.9 μm).
[0050] 2. Toning
[0051] With 10 kilograms of above-made PVDF powder coating base material and 4 kilograms of cobalt blue (Blue-640, Shanghai E...
Embodiment 2
[0053] 1. Manufacture base material
[0054] First, 63 kg of PVDF resin (FR9631, Shanghai Sanaifu New Materials Co., Ltd.), 27 kg of acrylate resin (B44, Rohm and Haas) and 10 kg of rutile titanium dioxide (R960, DuPont) were added to the high-speed mixing extruder (SHR, Zhangjiagang Zhenxiong Plastic Machinery Factory) to mix evenly; then, use a co-rotating twin-screw extruder (TDS-30B, Nanjing Nuoda Extrusion Equipment Co., Ltd.) to melt and extrude the powder at a temperature of about 200°C out, the feeding frequency is about 8Hz, and water-cooled granulation; after the particles are dried, use an air-induced pulverizer (Beijing Kunjie Yucheng Machinery Equipment Co., Ltd.) to pulverize the pellets at low temperature in liquid nitrogen, and then use a 200-mesh standard Obtain PVDF powder coating base material (D 50 = 79.9 μm).
[0055] 2. Toning
[0056] Add 10 kilograms of above-prepared PVDF powder coating base materials and 2 kilograms of chrome yellow (603-H, Shangha...
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