Silane crosslinked polyethylene plastic for low shrinkage anti-crack tube and its preparation method

A polyethylene plastic and silane cross-linking technology, applied in applications, household utensils, tubular articles, etc., can solve the problems of large shrinkage rate, poor resistance to environmental stress cracking, etc., achieve extended service life, solve short continuous production cycle, large The effect of burst pressure

CN100532441CActive Publication Date: 2009-08-26上海高分子功能材料研究所
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2009-08-26

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Abstract

The invention relates the silicon alky cross-linking low-middle-high density vinyon. The components comprises 0.8-3.0wt% silicon alky cross linking agent, 0.02-2.0wt% cross linking initiating agent, 0.02-1.0wt% cross linking catalyst, 0.01-3.0wt% anti-oxidant and 0.05-3.0wt% modified auxiliary agent. The method comprises the following steps: preparing silicon alky grafting material A, mixing A and B materials, handing with extrusion machine to get tubing product, keeping it in water bath at 85Deg.C or vaporium for 8 hours, and getting the product. The invention overcomes the defects of big contraction percentage and degelatinizing phenomena between polythene layer and metal layer; the invention has the advantages of short production circle, stable technology and high rate of finished products.
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Description

technical field

[0001] The invention relates to a low-medium-high-density polyethylene material used for the inner and outer layers of all-plastic pipes, aluminum-plastic composite pipes and steel-plastic pipes. Specifically, it relates to a material with low shrinkage rate, anti-cracking in various environments, and improving the mechanical properties and heat resistance properties of polyethylene plastics through silane crosslinking. Background technique

[0002] Traditional drinking water pipes, industrial gas transmission, and oil pipelines are generally made of galvanized steel pipes. For decades, galvanized steel pipes have often been rusted and scaled, causing secondary pollution of drinking water, and the liquid flow resistance is large, which is relatively useless. Short life. So people seek a new material to replace the original galvanized steel pipe. PPR and cross-linked polyethylene have become popular materials.

[0003] The strength of PPR is low under hot c...

Examples

Embodiment 1

[0037] Example 1 is used in occasions requiring a higher degree of crosslinking.

Embodiment 2

[0038] Example 2 is used in occasions that have higher requirements on the appearance of pipes.