Silane crosslinked polyethylene plastic for low shrinkage anti-crack tube and its preparation method
A polyethylene plastic, low-shrinkage and anti-resistance technology, applied in applications, household utensils, tubular objects, etc., can solve the problems of large shrinkage rate, poor resistance to environmental stress cracking, etc., achieve extended service life, solve continuous production cycle Short and stable sex high effect
Active Publication Date: 2006-12-13
上海高分子功能材料研究所
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Problems solved by technology
[0004] The object of the present invention is to improve the disadvantages of large shrinkage rate and poor resistance to environmental stress cracking while retaining all the advantages of common cross-linked polyethylene
Method used
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Embodiment 1
[0035] Example 1 is used in occasions requiring a higher degree of crosslinking.
Embodiment 2
[0036] Example 2 is used in occasions that have higher requirements on the appearance of pipes.
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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.
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...
Claims
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IPC IPC(8): C08L23/06C08K5/54C08J3/24B29C47/00B29D23/00
CPCY02P20/52
Inventor 穆肖斌项华丽贾建平
Owner 上海高分子功能材料研究所
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