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Process for preparing silane crosslinked polyethylene by room temperature crosslinking

A technology of cross-linked polyethylene and silane cross-linking, which is applied in the field of preparation of silane cross-linked polyethylene by cross-linking at room temperature, can solve problems such as complex operation, affecting product performance, and difficult conditions to control, and achieve high product yield and excellent product performance , low cost effect

Inactive Publication Date: 2007-01-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former method is mainly applicable to HDPE, and does not mention the cross-linking method; although the latter can be cross-linked at room temperature, the water required for cross-linking needs to diffuse and infiltrate from the outside, which is bound to be related to the environmental conditions and the thickness of the part. Complicated operations, difficult conditions to control and affect product performance

Method used

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  • Process for preparing silane crosslinked polyethylene by room temperature crosslinking
  • Process for preparing silane crosslinked polyethylene by room temperature crosslinking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: the influence of different polyethylene resins on grafting rate

[0042] Dissolve 0.3 gram of initiator dicumyl peroxide (DCP) into chelate of 3 gram of vinyltriethoxysilane, 1 gram of ethyltrimethoxysilane, 1 gram of tetrabutoxytitanane and ethyl acetoacetate compound (mass ratio 1:1), then mixed with 100 grams of different types of polyethylene resins, fed into the extruder at 160°C for melting, grafting and granulation, and baked at 80°C for 1 hour to obtain the grafted material. Get 1 gram of graft material and wrap it up with filter paper, put into the reaction flask with the band reflux condenser that adds 100ml chloroform, heat and reflux for 8 hours, change chloroform once every 4 hours, take out the filter paper bag after finishing, dry Weigh after drying, calculate the grafting rate, the silane grafting rate of different polyethylene resins is shown in Table 1:

[0043] polyethylene resin

Embodiment 2

[0044] Embodiment 2: the impact of different alkenyl alkoxysilanes on polyethylene grafting ratio

[0045]Chelation of 0.1 g of initiator dicumyl peroxide (DCP) into 5 g of different alkenylalkoxysilanes and 1.5 g of propyltrimethoxysilane, 1.5 g of tetrabutoxytitanane with acetylacetone (mass ratio 1: 1) mixed solution, then mixed with 100 grams of LLDPE, into the extruder at 160 ℃ of melting grafting granulation, 80 ℃ of baking 1 hour seal preservation to obtain the graft material; get the graft material 1 Wrap it with filter paper, put it into a reaction flask with 100ml of chloroform and a reflux condenser, heat and reflux for 8 hours, change the chloroform once every 4 hours, take out the filter paper bag after the end, weigh after drying, and calculate Grafting rate, the grafting rate of different alkenyl alkoxysilanes in LLDPE is shown in Table 2:

[0046] alkenyl alkoxy silicon

Embodiment 3

[0047] Example 3: Effect of chelates of methyltrimethoxysilane and tetrabutoxytitanane with ethyl acetoacetate on the gel content of silane-grafted polyethylene

[0048] Chelation of 0.1 g of initiator dicumyl peroxide (DCP) into 3 g of vinyltriethoxysilane and different amounts of methyltrimethoxysilane and tetrabutoxytitanes with ethyl acetoacetate (Methyltrimethoxysilane and tetrabutoxytitanane chelate mass ratio 1: 1) mixed solution, then mixed with 100 grams of LDPE, into the extruder at 170 ℃ melting grafting granulation, 80 Dry at ℃ for 1 hour and seal the grafted material to obtain the grafted material; take 1 gram of the grafted material and wrap it with filter paper, put it into a reaction bottle with a reflux condenser added with 100ml of toluene, heat and reflux for 8 hours, change the toluene once every 4 hours, and end Finally, the filter paper bag was taken out, weighed after drying, and the gel content was calculated. The chelates (mass ratio 1: 1) of different...

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Abstract

The present invention is room temperature cross-linking process of preparing silane cross-linked polyethylene, and the silane cross-linked polyethylene is prepared with grafting material and catalytic material in the weight ratio of 5-20 to 1 and through room temperature cross-linking. The grafting material consists of polyethylene resin 100 weight portions, alkenyl alkoxy silane 0.5-5 weight portions, alkyl trimethoxy silane 0.5-3 weight portions, titanium-alkoxide chelate 0.5-3 weight portions and free radical initiator 0.01-2 weight portions. The catalytic material consists of polyethylene resin 100 weight portions, water generating agent 0.5-30 weight portions, cross-linking catalyst 1-5 weight portions. Compared with available technology, the present invention has the features of advanced technological process, high product yield, low power consumption, excellent product performance, etc.

Description

(1) Technical field [0001] The invention relates to a method for preparing silane cross-linked polyethylene by cross-linking at room temperature, in particular to a method for preparing silane cross-linked polyethylene by adding a water producing agent and cross-linking at room temperature. (2) Background technology [0002] A large application of silane cross-linked polyethylene is the preparation of cable materials and pipes. The early silane cross-linked polyethylene, as introduced in the Chinese invention patent CN96119846. ~12 hours, or 15~20 days under natural conditions to complete the crosslinking. This will greatly reduce the production efficiency, consume a large amount of energy, and increase the follow-up equipment and warehouses, resulting in the high price of silane cross-linked polyethylene, which is difficult to promote and apply on a large scale. Then there is Chinese invention patent CN02151548.4 which introduces a new silane cross-linked polyethylene, whi...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08K5/5425
Inventor 邬润德童筱莉
Owner ZHEJIANG UNIV OF TECH
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