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 diff

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

Example Embodiment

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

[0042] Dissolve 0.3 grams of initiator dicumyl peroxide (DCP) into the chelate of 3 grams of vinyl triethoxy silane, 1 gram of ethyl trimethoxy silane, 1 gram of tetrabutoxy titanane and ethyl acetoacetate. The mixture (mass ratio 1:1) is mixed with 100 grams of different types of polyethylene resin, and then melted into the extruder at 160℃ for grafting granulation, and dried at 80℃ for 1 hour, sealed and stored to obtain the grafted material. ; Take 1 gram of grafting material and wrap it with filter paper, put it into a reaction flask with a reflux condenser filled with 100ml of chloroform, heat to reflux for 8 hours, change the chloroform every 4 hours, take out the filter paper bag, and bake Weigh after drying to calculate the grafting rate. The silane grafting rate of different polyethylene resins is shown in Table 1:

[0043] Polyethylene resin

Example Embodiment

[0044] Example 2: The effect of different alkenyl alkoxy silanes on the grafting rate of polyethylene

[0045]Dissolve 0.1 g of initiator dicumyl peroxide (DCP) into 5 g of different alkenyl alkoxysilanes, 1.5 g of propyltrimethoxysilane, 1.5 g of tetrabutoxytitanium and acetylacetone chelate The mixture (mass ratio 1:1) is mixed with 100 grams of LLDPE, and then fed into the extruder at 160°C for melt grafting and granulation, and dried at 80°C for 1 hour, sealed and stored to obtain the grafted material; take the grafted material 1 Wrap it with filter paper, put it into a reaction flask with a reflux condenser containing 100ml of chloroform, heat to reflux for 8 hours, change the chloroform every 4 hours, take out the filter paper bag after the end, dry it and weigh it, calculate Grafting rate, the grafting rate of different alkenyl alkoxysilanes in LLDPE is shown in Table 2:

[0046] Alkenyl Alkoxy Silicon

Example Embodiment

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

[0048] Dissolve 0.1 g of initiator dicumyl peroxide (DCP) into 3 g of vinyl triethoxy silane and different amounts of methyl trimethoxy silane and tetrabutoxy titanane to chelate with ethyl acetoacetate (Methyltrimethoxysilane and tetrabutoxytitane chelate mass ratio 1:1) mixed liquid, then mixed with 100 grams of LDPE, into the extruder at 170 ℃ melt grafting granulation, 80 Bake at ℃ for 1 hour to seal and store the grafted material; take 1 gram of the grafted material and wrap it with filter paper, put it into a reaction flask with a reflux condenser filled with 100ml of toluene, heat to reflux for 8 hours, and change toluene every 4 hours. End Then take out the filter paper bag, dry it and weigh it to calculate the gel content. It is prepared with different amounts of methyltrimethoxysilane and tetrabutoxytitanium...

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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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