Spraying-free PVC composition having special aesthetic effects and preparation method and application thereof
A special effect powder and spray-free technology, which is applied in the field of polymer materials, can solve the problems of uneven distribution of special effect powder, unstable flow rate, flow marks and weld lines, etc., so as to improve the market application range and shear resistance , to reduce the effect of weld lines
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Embodiment 1-6
[0042] Example 1-6 Preparation of polymer-coated special effect powder microspheres:
[0043] According to the formula in Table 1, firstly, add anti-oxidation and corrosion inhibitor to the water-based polymer dispersion at room temperature, stir and disperse for 15 minutes to obtain a dispersion; while stirring, slowly add special effect powder, or water-based Special effect powder slurry, then add curing agent while stirring, and continue to stir for 30-120 minutes, so that the special effect powder is fully dispersed and covered by the dispersion liquid, and finally a composite dispersion liquid of polymer-coated special effect powder is obtained; The composite dispersion liquid is spray-dried to obtain polymer-coated special-effect powder microspheres. The temperature of the air inlet during the spray-drying process is 150-300° C., and the temperature of the air outlet is 50-130° C.
Embodiment 1
[0046] In Example 1: the water-based polymer dispersion is a modified PVC emulsion, and its solid content is 10wt%; the metal powder is a surface-treated flake aluminum powder, and the content of the Al element in the aluminum powder is 60wt%, containing Zn and Sn; its particle size is 100 μm; the anti-oxidant corrosion inhibitor is pyrogallic acid; the curing agent is polycarbodiimide.
Embodiment 2
[0047] In Example 2: the water-based polymer dispersion is a polyurethane-acrylate emulsion, and its solid content is 60wt%; the metal powder is a surface-treated flake copper powder, and the content of Cu element in the copper powder is 70wt%, containing Zn and Sn; its particle size is 5 μm; the anti-oxidant corrosion inhibitor is benzotriazole; the curing agent is polyisocyanate.
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