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High-temperature-resistant expansion water blocking material for cables and preparation method

A high-temperature-resistant, expansion-type technology, which is applied in the field of high-temperature-resistant expansion-type water-blocking materials for cables and its preparation, can solve problems such as poor water-blocking and moisture-proof effects, complicated preparation processes, and poor compression resistance, and achieve fast repair efficiency, Good durability, good compression effect

Inactive Publication Date: 2018-07-06
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the low expansion rate of the currently widely used intumescent water-blocking materials at high temperatures, there are defects such as low repair efficiency, poor water-blocking and moisture-proof effects, poor compression resistance, and complicated preparation processes.

Method used

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  • High-temperature-resistant expansion water blocking material for cables and preparation method
  • High-temperature-resistant expansion water blocking material for cables and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The specific process of the preparation of pre-crosslinked polyoxyethylene ester is:

[0034] Add zinc glutarate and nano-kaolin to propylene oxide, disperse evenly, and then pass in carbon dioxide gas. Under the catalysis of zinc glutarate, propylene oxide and carbon dioxide undergo copolymerization reaction, and use nano-kaolin as crosslink The interpenetrating network structure of pre-crosslinked polyethylene oxide was obtained; zinc glutarate was prepared from zinc oxide as zinc source; the copolymerization reaction time was 12h;

[0035] In the copolymerization reaction system, each raw material is calculated in parts by weight, including: 1 part of zinc glutarate, 5 parts of nano-kaolin, 45 parts of propylene oxide; excess carbon dioxide is introduced;

[0036] (2) The specific process of blending modification of natural rubber is:

[0037] Swell the natural rubber with a solvent first, then add the prepared pre-crosslinked polyethylene oxide into a vacuum kn...

Embodiment 2

[0043] (1) The specific process of the preparation of pre-crosslinked polyoxyethylene ester is:

[0044] Add zinc glutarate and nano-kaolin to propylene oxide, disperse evenly, and then pass in carbon dioxide gas. Under the catalysis of zinc glutarate, propylene oxide and carbon dioxide undergo copolymerization reaction, and use nano-kaolin as crosslink The pre-crosslinked polyethylene oxide of the interpenetrating network structure is obtained; the zinc glutarate is made of zinc hydroxide; the copolymerization reaction time is 10h;

[0045] In the copolymerization reaction system, the raw materials are calculated in parts by weight, including: 1 part of zinc glutarate, 4 parts of nano-kaolin, 40 parts of propylene oxide; excess carbon dioxide is introduced;

[0046] (2) The specific process of blending modification of natural rubber is:

[0047] Swell the natural rubber with a solvent first, then add the prepared pre-crosslinked polyethylene oxide into a vacuum kneader, and ...

Embodiment 3

[0053] (1) The specific process of the preparation of pre-crosslinked polyoxyethylene ester is:

[0054] Add zinc glutarate and nano-kaolin to propylene oxide, disperse evenly, and then pass in carbon dioxide gas. Under the catalysis of zinc glutarate, propylene oxide and carbon dioxide undergo copolymerization reaction, and use nano-kaolin as crosslink The pre-crosslinked polyethylene oxide of the interpenetrating network structure is obtained; the zinc glutarate is made of zinc nitrate; the copolymerization reaction time is 14h;

[0055] In the copolymerization reaction system, the raw materials are calculated in parts by weight, including: 2 parts of zinc glutarate, 6 parts of nano-kaolin, 50 parts of propylene oxide; excess carbon dioxide is introduced;

[0056] (2) The specific process of blending modification of natural rubber is:

[0057] Swell the natural rubber with a solvent first, then add the prepared pre-crosslinked polyethylene oxide into a vacuum kneader, and f...

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Abstract

The invention relates to the field of cable materials, and discloses a high-temperature-resistant expansion water blocking material for cables and a preparation method. The method comprises the following steps: (1), adding zinc glutarate and nano-kaolin into propylene epoxide, uniformly dispersing, and then introducing carbon dioxide gas, so as to obtain pre-crosslinked polyoxyethylene ester withan interpenetrated network structure; (2), swelling natural rubber through a solvent, and then adding the natural rubber and the formed pre-crosslinked polyoxyethylene ester into a vacuum kneader, andsufficiently mixing under the action of two Sigma-shaped paddles, so as to obtain modified natural rubber; (3), performing banburying on high-temperature silica gel and the modified natural rubber, and then performing slow cooling, so as to obtain water swelling rubber blocking water through water. Compared with common water blocking materials, the expansion water blocking material has the advantages that the expansion property is good in high-temperature environment, the expansion speed is high, and the repair efficiency is high, so that cables have high compression resistance, water blocking and dampproof properties, the durability is high, the whole preparation process is simple, the cost is low, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of cable materials, and discloses a high-temperature-resistant expansion type water-blocking material for cables and a preparation method thereof. Background technique [0002] In power engineering, cables are usually laid in direct burial, cable trenches, tunnels, etc., which inevitably come into direct contact with water, and may even be soaked in water for a short or long time, causing moisture to slowly penetrate into the cable. Common cross-linked polyethylene insulation materials will produce water trees after the cable runs for a period of time. When the water trees grow to a certain extent, the cable insulation layer will break down, and the safety accidents caused by this will increase year by year. More and more Users urgently need cables with good water-blocking properties. Therefore, research and application of good water-blocking structures and better water-blocking methods to improve the water-blocking p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L83/04C08L69/00C08K3/34
CPCC08L7/00C08K2201/011C08L2201/08C08L2203/202C08L2205/03C08L2312/00C08L83/04C08L69/00C08K3/346
Inventor 陈庆昝航
Owner CHENDU NEW KELI CHEM SCI CO LTD