Functional master batch for improving appearance flow mark defects of spraying-free material and preparation method thereof

Abstract

The invention discloses a functional master batch for improving the appearance flow mark defect of a spraying-free material and a preparation method, and relates to the technical field of macromolecules. The metal silver polypropylene functional master batch comprises the following components in parts by weight: 15-40 parts of polypropylene, 30-50 parts of modified nano silicon dioxide, 20-35 parts of surface modified metal pigment, 1-5 parts of a compatilizer and 3-6 parts of other auxiliary agents; according to the invention, a fluid silicon dioxide nano ionic material with a core-shell structure is prepared by an acid-base neutralization method. The modified nano silicon dioxide fluid is adopted to coat the surface of a metallic pigment to form a protective layer, and amino with strongpolarity is introduced into a non-polar molecular main chain, so that the dispersion of the metal pigment in polypropylene is greatly improved, and the flow direction stability of the metal pigment ina molten polypropylene plastic in a mold cavity can be effectively improved; the change of the arrangement direction of the flaky metal pigment in the melt is greatly reduced, and the original parallel arrangement is maintained, so that the flow mark or water mark symptoms on the surface of the product are improved.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a functional masterbatch and a preparation method for improving the appearance flow mark defects of spray-free materials. Background technique [0002] In recent years, with the continuous improvement of living standards and the continuous improvement of the country's environmental protection requirements, the painting process is more and more polluted due to its environmental pollution, easy paint peeling, difficult repair after paint peeling, complicated process, and non-recyclable defective products. more and more people's attention. With the development of materials and mold technology, spray-free materials that replace the spraying process have become a new trend in the application of plastic products. [0003] Spray-free plastics refer to products that add metal pigments, pearlescent pigments and other pigments with special color effects to the resin to obtain a product s...

AI Technical Summary

Problems solved by technology

However, for the existing surface-sprayed plastics, injection molding manufacturers are affected by the structure of parts and rib positions during injection molding. When using spray-free plastic products, surface defects such as flow marks are prone to appear on the surface, which affects the batch use of spray-free plastics.

In recent years, some people have proposed to use bimodal polypropylene to improve the appearance of flow marks, but after the verification of actual projects, bimodal polypropylene metal silver cannot solve the problem of flow marks very well

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