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    Graphite modified PP plastic

    Time: 2019-03-14 18:36 Author: admin Hits: Times

    The shrinkage control of graphite modified PP plastic is an important aspect of PP modification. In the modification process, what are the methods to control the shrinkage of graphite modified PP plastic? Let's find out below!

    1.The addition of polyethylene

    Polyethylene is also a high crystallinity plastic, and the molding shrinkage rate is also very large, but after adding polypropylene to each other, they destroy the crystallinity to different degrees, and the overall molding shrinkage rate decreases.

    2.Change of PP plastic's own melting index

    The molding shrinkage of polypropylene is affected by its crystallinity, and the crystallinity is affected by its own molecular weight. When MI increases, molecular weight decreases, crystallization speed increases, and mold shrinkage increases. Polypropylene MI also has an effect on the shrinkage of the molding.

    Graphite modified PP plastic

    3.Glass fiber reinforced

    Glass fiber reinforcement is an important method for graphite modified PP plastics. Glass fiber has the greatest influence on the shrinkage of PP modified materials. When the glass fiber content reaches more than 30%, the molding shrinkage of PP plastic decreases from 1.8 to 0.5, and the surface-treated glass fiber has a greater impact on the molding shrinkage than the glass fiber without treatment. The addition of glass fiber destroys the crystallinity of PP and affects the shrinkage rate. At the same time, glass fiber limits the crystal shrinkage of PP plastic.

    4.Mineral filling

    The mineral additives for graphite-modified PP plastics are mainly calcium carbonate, talc, and mica powder, which have a significant effect on the shrinkage of graphite-modified PP plastics.


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