Foaming modifier, foaming masterbatch, foaming material and preparation method thereof

Abstract

The invention provides a foam modifier, a foam master batch, a foam material and a preparation method thereof. Among them, the foam modifier uses ferric nitrate as the heat absorbing agent, copper nitrate or copper sulfate as the slow-release agent, and is combined with coating materials to prepare the foam modifier. The foaming modifier, foaming agent, carrier and auxiliary agent are mixed and extruded to obtain the foaming masterbatch. The prepared foam masterbatch has the characteristics of high initial decomposition temperature, slow decomposition speed and wide decomposition temperature range. At the same time, the decomposition of the endothermic agent in the foaming modifier can also generate gas, thereby increasing the foaming ratio. Based on the above characteristics of the foaming masterbatch, it can be prepared in a resin matrix with high fluidity, with high foaming efficiency, small cell diameter, no appearance defects such as air marks, material flowers, peeling and delamination, and high mechanical properties. foam material.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a foaming modifier, a foaming masterbatch, a foaming material and a preparation method thereof. Background technique [0002] Driven by the lightweight trend of automobiles, micro-foamed materials, as an air-filled composite material, have the characteristics of low density and significant weight reduction effect. The performance impact of the artifact is slight and highly respected. However, in the injection molding process of micro-foamed polypropylene prepared by chemical foaming, there are common appearance problems such as air marks, material flowers, peeling and delamination, which affect the appearance of the parts. The internal structure of the part has problems such as too large pore size, poor pore size uniformity, and string holes, which affect the performance of the part. These are related to the mold structure, molding method, auxiliary technology and melt stre...

AI Technical Summary

Problems solved by technology

However, the higher the melt strength of the base material, the relative fluidity tends to decrease, especially for the polypropylene material, the fluidity of the high melt strength polypropylene material obtained by cross-linking and grafting will decrease significantly , the resistance to gas foaming and expansion increases, and the expansion ratio is often not high

For materials with high flow and high melt strength, due to the limited shear dispersion ability of the melt storage material of the injection molding equipment, when the foaming agent decomposes too fast, part of the foaming agent has decomposed and expanded into local large cells. High body strength and no cell rupture ensure a good appearance of the part, but local large cells will cause stress concentration, even if the mechanical properties of the non-foaming area are high, the stress concentration will seriously affect the performance of the part

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