Polyolefin material foamed particles and production method thereof

Abstract

The invention provides polyolefin material foamed particles and a production method of the polyolefin material foamed particles. The polyolefin material foamed particles comprise raw material components with the following contents in parts by weight: 100 parts of a polyolefin material, 15-30 parts of light calcium carbonate, 2-3 parts of active nano zinc oxide, 0.7-1.2 parts of dicumyl peroxide, 2-2.5 parts of an AC foaming agent, 0.2-0.4 part of ammonium hydrogen carbonate, 1-3 parts of calcium stearate, 1-3 parts of zinc stearate and 2-3 parts of TMPTA. The production method comprises the following steps: mixing the raw materials, performing internal mixing, milling and granulation, feeding to a first fluidized bed by virtue of a screw feeder, and completing crosslinking and prefoaming in presence of hot air at 130 DEG C; then feeding to a second fluidized bed, and completing foaming in presence of the hot air at 160-180 DEG C; then feeding to a third fluidized bed, and cooling and curing in presence of cold air at 82-100 DEG C; finally collecting, weighing and packaging. The polyolefin material foamed particles provided by the invention can be subjected to high-temperature chemical foaming at normal pressure, can achieve continuous production, and are more uniform compared with mold pressing foaming, and the production efficiency and the application of the polyolefin material foamed particles can be greatly improved.

Description

【Technical field】 [0001] The invention relates to polyolefin foamed particles and a production method thereof. 【Background technique】 [0002] Polyolefin materials include polymer materials composed of hydrocarbons such as PE and EVA. Generally, chemical foaming is used. Polyolefin materials have insufficient melt strength at the temperature of foaming and decomposition, so they need to be cross-linked to improve their strength. When the blowing agent decomposes, it maintains a certain strength of the cell wall. Usually polyolefin foaming is carried out under pressure, first cross-linking and then foaming, under pressure, it can ensure that the gas does not leak out and form a foam with complete bubbles (commonly known as closed-cell foam), so polyolefin Olefin foaming can hardly be carried out continuously, but must be produced in the gap in the mold, and the production efficiency is low. 【Content of invention】 [0003] One of the technical problems to be solved by the ...

AI Technical Summary

Problems solved by technology

Usually polyolefin foaming is carried out under pressure, first cross-linking and then foaming, under pressure, it can ensure that the gas does not leak out and form a foam with complete bubbles (commonly known as closed-cell foam), so polyolefin Olefin foaming can hardly be carried out continuously, but must be produced in the gap in the mold, and the production efficiency is low

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