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

Abstract

The invention provides a foaming modifier, a foaming masterbatch, a foaming material and a preparation method of the foaming material. The foaming modifier is prepared by taking ferric nitrate as a heat absorbing agent and copper nitrate or copper sulfate as a slow release agent, matching with a coating material, and mixing and extruding the foaming modifier, the foaming agent, the carrier and theauxiliary agent to obtain the foaming masterbatch. The prepared foaming masterbatch has the characteristics of high initial decomposition temperature, low decomposition speed and wide decomposition temperature range. The heat absorbing agent in the foaming modifier can be decomposed to generate gas, so that the foaming ratio is increased. Based on the characteristics of the foaming master batch,the foaming material with high foaming efficiency, small foam pore diameter, no apparent defects such as gas marks, material spots, peeling and layering on the appearance and high mechanical propertycan be prepared in a resin matrix with high fluidity.

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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