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Method for preparing organosilane crosslinked polyethylene with long quality guarantee period by solid one-step process

A technology of silane cross-linking and shelf life, which is applied in the field of solid-phase one-step production of silane cross-linked polyethylene, can solve the problems of cross-linked polyethylene scrapping, low cross-linking degree of silane cross-linked polyethylene, and inability to cross-link, so as to prevent Effect of condensation reaction, good processability and degree of crosslinking

Active Publication Date: 2012-08-29
上海新上化高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of production and storage, the silanol condensation catalyst dibutyltin dilaurate, etc. will react with the silane crosslinking agent vinyltrimethylsilane / vinyltriethylsilane, resulting in low crosslinking degree of silane crosslinked polyethylene, Can't even crosslink
Generally, after 2 months of storage, due to the condensation reaction between the silane crosslinking agent and the silanol condensation catalyst, the one-step crosslinked polyethylene is scrapped.

Method used

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  • Method for preparing organosilane crosslinked polyethylene with long quality guarantee period by solid one-step process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1 part of 4-amino-α, α, 4-trimethyl-cyclohexanementamine, 1 part of formic acid, 3 parts of salicylamidophthalimide, 0.5 parts of tetrakis (3-( 3', 5'-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester, 100 parts of polyethylene resins are kneaded at 130 DEG C in a kneader, extruded and granulated to obtain catalyst masterbatch particles, and then The obtained catalyst master batch particles are immersed in molten paraffin, stirred for 100 seconds, then filtered, the catalyst master batch particles are collected, and dried to obtain catalyst master batch particles coated with paraffin wax on the surface;

[0026] Then, the above-mentioned catalyst masterbatch particles wrapped in paraffin, 95 parts of polyethylene resins, 5 parts of polypropylene resins, 2 parts of vinyltriisopropoxysilane, 1 part of dicumyl peroxide and 0.5 part of tetra( 3-(3',5'-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester is mixed at room temperature to obtain the p...

Embodiment 2

[0029] 1 part of 1,4-diamino-cyclohexanementamine, 1 part of formic acid, 3 parts of salicylamidophthalimide, 0.5 parts of tetrakis(3-(3',5'-di tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester, 100 parts of polyethylene resins were kneaded at 115°C in a kneader, extruded and granulated to obtain catalyst masterbatch particles, and then the obtained catalyst masterbatch particles were impregnated In molten paraffin, stirring for 100 seconds, then filtering, collecting catalyst masterbatch particles, drying, obtaining catalyst masterbatch particles coated with paraffin wax on the surface;

[0030] Then the above-mentioned catalyst masterbatch particles wrapped with paraffin and 100 parts of polyethylene resin, 5 parts of polypropylene resin, 2 parts of vinyltriisopropoxysilane, 1 part of dicumyl peroxide and 0.5 part of four (3- (3',5'-di-tert-butyl-4-hydroxyphenyl)propionate)pentaerythritol ester can be mixed uniformly at room temperature.

[0031] The amount by w...

Embodiment 3

[0033] The difference between this embodiment and Example 1 is that low molecular weight polyethylene is used to wrap the protective agent.

[0034] 1 part of 4-amino-α, α, 4-trimethyl-cyclohexanementamine, 1 part of formic acid, 3 parts of salicylamidophthalimide, 0.5 parts of tetrakis (3-( 3', 5'-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester, 100 parts of polyethylene resins were kneaded in a kneader at 115° C. to obtain catalyst masterbatch particles, and then the obtained catalyst masterbatch The particles are immersed in molten low-molecular-weight polyethylene with an average molecular weight of 2000, stirred for 30 seconds, then filtered, and the catalyst masterbatch particles are collected and dried to obtain catalyst masterbatch particles coated with low-molecular-weight polyethylene on the surface;

[0035] Then the above-mentioned catalyst masterbatch particles that have wrapped polyethylene with 100 parts of polyethylene resin, 5 parts of polypro...

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Abstract

The invention discloses a method for preparing organosilane crosslinked polyethylene with a long quality guarantee period by a solid one-step process, which comprises the following steps: (1) kneading a silanol composite catalyst, a metal passivator, an antioxygen, a processing aid and a polyolefin polymer, extruding and granulating the mixture, immersing the obtained catalyst master batch grainsin molten protective agent, collecting the catalyst master batch grains and drying; and (2), mixing the product obtained by the step (1) with polyvinyl resin, polypropylene, silane crosslinking agent, peroxide crosslinking agent and antioxygen at normal temperature to obtain the solid one-step process organosilane crosslinked polyethylene with a long quality guarantee period. The method can prevent the condensation reaction of the silane crosslinking agent and the catalyst. The quality guarantee period of the solid one-step process organosilane crosslinked polyethylene is more than one year. The solid one-step process organosilane crosslinked polyethylene has high processability and degree of cross linking and is suitable to be processed under normal conditions.

Description

technical field [0001] The invention relates to a solid phase one-step method for producing silane crosslinked polyethylene. technical background [0002] Silane-crosslinked polyethylene is generally employed in the silane process, a known one-step process. This method needs to inject the organic unsaturated silane into the liquid feeding equipment of the extruder in the form of liquid, so there are problems such as metering error. Moreover, this method requires a special type of expensive extruder with a high aspect ratio, and the equipment has poor versatility. In addition, high technology is required in extrusion. [0003] Another known one-step method is the silane crosslinking method in which silane is added to a solid carrier polymer disclosed in JP-A-3-167229, CN1198177A, and CN01105229.5. This method has problems such as low crosslinking efficiency and poor storage stability caused by oligomerization generated by silane condensation. [0004] As disclosed in CN01...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08K5/5425C08K5/14C08K5/01C08J3/22B29B9/06
Inventor 徐永卫邱汉亮欧阳观林穆肖斌龚华王芹
Owner 上海新上化高分子材料有限公司
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