Foaming material prepared by blending plant straw filled polypropylene/polyethylene and preparation process

Abstract

The invention provides a foaming material prepared by blending plant straw filled polypropylene / polyethylene. The foaming material comprises the following raw materials in parts by weight: 60-80 parts of polypropylene plastic, 20-40 parts of polyethylene substrate, 1-5 parts of foaming agent, 40-50 parts of plant straw powder, 1-2 parts of coupling agent, 3-5 parts of heat stabilizer and 0.5-1 part of lubricating agent. The preparation process comprises the following steps: preparing the plant straw powder, and then treating the plant straw powder with the coupling agent; evenly mixing the polypropylene plastic, the polyethylene substrate, the foaming agent, the plant straw powder treated by the coupling agent, the heat stabilizer and the lubricating agent; carrying out fusion blending and pelleting on the mixture, and carrying out extrusion molding; and finally, heating the sectional material, adding the foaming agent for mixing, extruding and foaming in an extrusion machine, and cooling to obtain the product, wherein the temperature of the extrusion machine is controlled between 180 DEG C and 200 DEG C. The product prepared by the process in the invention has better bubble form,foaming density and density of the foaming material as compared with the other foaming materials; and simultaneously, the product has excellent impact strength and physical and mechanical properties.

Description

technical field [0001] The invention relates to a foaming material, in particular to a foaming material made of plant straw filled polypropylene / polyethylene blend and a preparation process thereof. Background technique [0002] At present, a large amount of straw produced by agricultural production is first crushed and returned to the field as fertilizer, but the long-term use of this treatment method will increase the possibility of crop diseases, and its utilization value is also low; second, it is used as fuel. The value is greatly reduced, and some are treated as waste, such as incineration, which not only causes waste of resources, but also pollutes the environment. [0003] In recent years, the production and development of foamed PP has become a research hotspot. However, due to the crystallization characteristics of PP, its processing and molding are more difficult. As the processing temperature increases, the viscosity of PP resin drops sharply, and the gas deco...

AI Technical Summary

Problems solved by technology

However, due to the crystallization characteristics of PP, its processing and molding are more difficult.

As the processing temperature increases, the viscosity of PP resin drops sharply, and the gas decomposed by the blowing agent is difficult to maintain in the resin, which makes it difficult to control the foaming; due to the release of more heat during crystallization, the melt strength decreases and foaming occurs. Bubbles are easily destroyed after foaming, so it is difficult to obtain a foam with high independent cells