Waste polypropylene-modified foaming plate and manufacturing method thereof

Abstract

A waste polypropylene-modified foaming plate comprises a core foaming layer and an outer layer covering the upper and the lower surfaces of the core foaming layer; the outer layer is prepared by mixing the following components and performing melt extrusion, wherein the components comprises by weight: 97-99.9 parts of modified polypropylene, 0.1-3 parts of anti-oxidants; the core foaming layer is prepared by mixing the following components and performing melt foaming, wherein the components comprises by weight: 60-90 parts of modified polypropylene, 0-20 parts of regenerated polyethylene, 5-10parts of foaming masterbatches, and 5-10 parts of foaming temperature adjusting masterbatches; the manufacturing method of the foaming plate comprises the following steps: preparing activated inorganic powder, preparing a modified auxiliary agent peroxide masterbatch, preparing a modified auxiliary agent monomer masterbatch, preparing the foaming masterbatch, preparing the foaming temperature adjusting masterbatch, and preparing the core foaming plate. The waste polypropylene-modified foaming plate has high melt strength, and the manufacturing method has the characteristics of low production cost and no environment pollution.

Description

technical field [0001] The invention relates to the field of polymer material modification, in particular to a waste polypropylene modified foam board and a manufacturing method thereof. Background technique [0002] Polypropylene (hereinafter referred to as PP) foaming material has a wide market demand for its excellent heat resistance and mechanical properties, but PP is a crystalline polymer, its softening point and melting point are very close, and its melting range is narrow. When thermoforming is carried out at the melting point of crystallization, the strength drops sharply, so that the viscoelastic region of PP cannot be kept stable in a wide temperature range during thermoforming, that is, the melt strength of PP drops rapidly after the temperature is higher than the melting point of crystallization, and its viscosity It will also drop rapidly. At high temperature, this non-viscoelastic PP melt film is difficult to wrap the foaming gas, and the foaming performance i...

AI Technical Summary

Problems solved by technology

[0004] The first two methods are difficult to popularize and apply because of the high manufacturing cost

For example, the patent with publication number CN1861368A discloses a "Production Method of Non-crosslinked Polypropylene Foaming Material", which obtains higher melt strength by adding high melt strength polypropylene and polyethylene for polymerization modification, In order to complete foam extrusion, the price of high melt strength polypropylene resin is relatively high, and the equipment used needs special explosion-proof treatment, resulting in high product cost and unacceptable product in the actual application process

Another example: the patent application whose publication number is CN101081914A discloses a kind of "polypropylene foaming material and its manufacturing method". For foaming, not only the manufacturing cost is high, but also the foaming material is a cross-linked product, which is difficult to recycle

[0005] Publication number is CN101538387A patent application disclosed "polypropylene foaming material and its production method", and publication number is CN101614072A patent application disclosed "low foaming multi-layer plastic building formwork and production method", using general-purpose polypropylene, Recycled polypropylene and supercritical liquid are used as foaming agents. Although there is no such problem as "high product cost, and the foaming material is a cross-linked product, which is difficult to recycle", there is no description of how to improve the melt strength of PP or use What method is used to wrap the foaming gas so that it does not leak out to complete the foaming extrusion problem? In addition, it does not point out how to solve the problem that a considerable part of the recycled polypropylene has basically degraded and is mixed with nylon, ABS, dust impurities, ink, etc. , which will lead to higher melt index, lower melt strength, and increased brittleness of the product

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