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Method for preparing polyethylene foam material by taking water as foaming agent

A polyethylene foam and foaming agent technology, applied in the polymer field, can solve the problems of complex equipment, environmental hazards of foaming agents, large one-time fixed asset investment, etc., and achieve the effect of safety in the production process

Active Publication Date: 2009-09-02
天津佰盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the polyethylene chemical foaming technology, the cross-linking process is difficult to control. Often, a part of the foaming agent begins to decompose before the cross-linking reaction is completed, and the production process is discontinuous, and continuous length sheets cannot be produced. material
Japan uses radiation cross-linking technology to manufacture polyethylene foam. The advantage is that the degree of cross-linking can be precisely controlled. However, the disadvantage of this technology is that the equipment is more complicated and the one-time investment in fixed assets is large.
In addition, the most important thing is that the chemical foaming method cannot fully meet the requirements of the green environmental protection process, mainly due to the harm to the environment caused by the solid deposits generated after decomposition and the foaming agent that cannot be completely decomposed
Another method for preparing polyethylene foam is physical method, that is, direct use of low-boiling point organic foaming agents such as butane and pentane in the extrusion process to obtain foaming materials with different density requirements, but due to organic foaming The flammability of the agent greatly limits the wide application of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1. Take the raw material by the following parts by weight: 100 parts of low-density polyethylene, 0.5 part of water, 1 part of montmorillonite, 0.1 part of 2,6-di-tert-butyl-4-methylphenol, 1 part of zinc oxide , Stir and mix the above raw materials in a mixer, and directly extrude and foam on the twin-screw to obtain a foam with a foaming ratio of 3 times; the temperature range of the extrusion foaming system is:

[0015] Zone 1: 70°C, Zone 2: 120°C, Zone 3: 120°C, Zone 4: 140°C, Zone 5: 150°C, Zone 6: 150°C, Die: 130°C; Get a kind of water as a foaming agent Prepare polyethylene foam.

Embodiment 2

[0016] Embodiment 2. each component is taken by the following parts by weight: 100 parts of high-density polyethylene, 15 parts of water, 30 parts of silicon bath soil, 1 part of 2,6-di-tert-butyl-4-cresol, calcium carbonate 5 parts, the above raw materials are stirred and mixed in the mixer, and directly extruded and foamed on the twin-screw to obtain a foam with a foaming ratio of 20 times; the temperature range of the extrusion foaming system is:

[0017] Zone 1: 80°C, Zone 2: 130°C, Zone 3: 140°C, Zone 4: 200°C, Zone 5: 200°C, Zone 6: 180°C, Zone 7: 170°C, Die Head: 160°C; Water was used as blowing agent to prepare polyethylene foam.

Embodiment 3

[0018] Embodiment 3. each component is taken by the following parts by weight: 50 parts of high-density polyethylene, 50 parts of low-density polyethylene, 5 parts of water, 10 parts of cellulose, tetrakis [(3-3,5-di-tert-butyl Base-4-hydroxyphenyl) propionic acid] 0.5 part of pentaerythritol ester, 15 parts of barium carbonate, above-mentioned raw material is stirred and mixed in the mixer, directly extrudes and foams on twin-screw, can make the foaming ratio be 11 times the foam plastic; the temperature range of the extrusion foaming system is:

[0019] Zone 1: 70°C, Zone 2: 120°C, Zone 3: 130°C, Zone 4: 170°C, Zone 5: 190°C, Zone 6: 170°C, Zone 7: 160°C, Die Head: 140°C. Water was used as blowing agent to prepare polyethylene foam.

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PUM

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Abstract

The invention relates to a method for preparing a polyethylene foam material by taking water as a foaming agent. The method includes the steps that polyethylene is used as a raw material, water is used as the foaming agent, imvite, diatomite, fibrino, starch, polyacry lamide, and the like are used as water carriers, and a direct squeezing-out method is used for preparing polyethylene foam plastic. The invention does not use the organic foaming agent, thus, the production process of the technology has safety and environmental protection and can realize continuous production, and the foaming rate of the prepared polyethylene foam plastic is 3 to 20 times.

Description

technical field [0001] The invention relates to a method for preparing polyethylene foam material with water as a blowing agent, and belongs to the technical field of macromolecules. Background technique [0002] The common polyolefin foaming technology is chemical foaming, that is, a chemical foaming agent is mixed into polyolefin, the most typical one is azodicarbonamide (AC) foaming agent, and the foaming agent decomposes at a suitable temperature. produce N 2 , CO 2 , NH 3 and H 2 O and other gases to realize the foaming of polyolefin. Polyethylene chemical foaming technology has been disclosed in some patents. For example, Japanese patents 41-6278, 42-18832, etc. disclose polyethylene chemical foaming technology. Microcellular polyolefin foam material, the first step of this technology is to heat a foamable polyolefin resin composition containing a crosslinking agent and a blowing agent under pressure for a certain period of time, and put it under the condition tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L23/06B29C47/92B29C48/92
CPCB29C48/9185B29C48/92B29C2948/92704B29C2948/92895
Inventor 汪树生边俊甲刘浩韩常玉董丽松
Owner 天津佰盛环保科技有限公司
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