In the PVC foaming formula, in order to obtain more uniform, small and independent cell structure products, in addition to the selection of foaming agents such as: AC foaming agent, etc., a foaming regulator is also used in the general formula system, sometimes A foaming regulator (adjusting the temperature of the foaming agent) will also be added, such as metal oxides such as zinc oxide and lead oxide, organic acid salts such as zinc stearate, and urea derivatives.
PVC foaming regulator is actually an acrylate emulsion polymer, which has all the characteristics of PVC processing aids, and its molecular weight is much higher than that of PVC processing aids.
In PVC foamed products, the purpose of adding foaming agent is mainly to improve the melt strength of its melt and prevent the merger of bubbles, so as to obtain uniformly foamed PVC foamed products. At the same time, it can also promote the plasticization of PVC and ensure that the melt has good fluidity.
When choosing a PVC foaming regulator, it should be noted that PVC with different degrees of polymerization, such as PVC-700, PVC-800, and PVC-1000, should use different foaming regulators. Different products, such as: foamed board, foamed thick board, foamed thin board, wood-plastic foamed board, lead-plastic foamed board, etc., need to use different foaming regulators. Since PVC foaming aids are also acrylates and have the properties of processing aids, attention should also be paid to the internal and external lubrication balance of the formula when using them.
The foreign products of PVC foaming regulator mainly include Rohm and Haas K-400P, K-385, K-418 of the United States; PA-40 and PA-60 of KANEKA of Japan.
PVC foaming regulator 530 can adjust the cell density and uniformity of PVC foamed pipes and sheets, improve the surface quality and increase the strength of the melt. It is widely used in foamed PVC sheets, PVC pipes and PVC profiles.
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