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Silane graft cross linking polyolefine composition

A technology of cross-linked polyolefin and silane grafting is applied in the field of silane-grafted and cross-linked polyolefin compositions, and can solve the problems of unsolved heat resistance of the composition, unsatisfactory thermal elongation performance, poor cable flexibility, and the like, Achieve the effect of low cost, good economic benefit and smooth surface

Inactive Publication Date: 2009-10-07
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the two-step silane crosslinked polyethylene composition provided by this patent also has the following disadvantages when it is used in cable insulation materials: first, the composition does not solve the heat resistance problem of the composition, and its thermal extension performance is difficult to meet the requirements of cable insulation materials. requirements; secondly, the base resin used in the composition provided by the invention is mainly high-density polyethylene resin, which makes the flexibility of the formed cable poor; thirdly, because the processing temperature in the preparation of material A is relatively high, it needs to be Antioxidants are added during the preparation of material A, which not only hinders the reaction, but also increases the cost; in addition, because material B and material A cannot be melted synchronously, it is difficult to produce a cable with a smooth surface when extruding the cable at high speed

Method used

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  • Silane graft cross linking polyolefine composition
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Experimental program
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Embodiment Construction

[0044] Raw materials for the test:

[0045] Ethylene copolymer a: degree of branching = 1.90, pellets

[0046] Ethylene copolymer b: powder with branching degree=1.01, average diameter 1mm

[0047] Ethylene Copolymer Elastomer c: EVA

[0048] Compound crosslinking agent d: vinyltrimethoxysilane and vinyltriethoxysilane, the ratio is 2:1

[0049] Initiator e: dicumyl peroxide, 50% saturated solution, chemically pure

[0050] Ethylene copolymer f: degree of branching = 1.90, pellets

[0051] Ethylene copolymer g: branching degree = 1.01, powder with an average diameter of 1 mm

[0052] Crosslinking catalyst h: using dibutyltin dilaurate

[0053] Antioxidant i: composite antioxidant system of tetrakis[β-(3,5-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol and tris(2,4-di-tert-butylphenyl)phosphite , the ratio of the two is 1:1

[0054] Metal passivator j: Tianjin Chenguang Chemical Factory MDA-5;

[0055] Lubricant k: DuPont VITON FF-SC PW;

[0056] Inhibitor 1...

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Abstract

The invention relates to a silane grafted cross-linked polyolefin composition, which is prepared by two-step silane cross-linked technology, and a polyolefin resin with a high degree of branching is selected as the base resin in the graft material, and An ethylene copolymer elastomer, the composition has good heat resistance, aging performance and processing performance, the preparation process is simple, the addition of antioxidants in the grafting material is avoided, the cost is reduced, and the economic benefit is good , mainly used in the production of low-voltage (below 10KV) power cable insulation layer, the extrusion speed is high when processing the cable, the surface of the made cable is smooth, soft, and the comprehensive performance is good.

Description

technical field [0001] The invention relates to a crosslinked polyolefin composition, in particular to a silane grafted crosslinked polyolefin composition. The composition is prepared by a two-step silane graft crosslinking technology, and is mainly used for the production of low-voltage (below 10KV) power cable insulation layers. Background technique [0002] There are two commonly used crosslinking techniques for crosslinked polyolefin compositions for cable insulation, namely peroxide crosslinking and silane crosslinking. Among these two technologies, the silane cross-linking method is commonly used in the production of low-voltage (below 10KV) power cable insulation layers. The silane cross-linking method uses silane as a cross-linking agent to complete the polyolefin composition through two processes of grafting and cross-linking. of cross-linking. The production process of the silane crosslinked polyolefin composition mainly has two kinds of one-step method and two-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K5/541
Inventor 谢侃张建耀刘少成许平张桂云丛日新迟丽萍张瑜
Owner CHINA PETROLEUM & CHEM CORP