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Silane crosslinked polyethylene resin composition for pipes and method for preparing pipes

A polyethylene resin, silane cross-linking technology, applied in the direction of tubular articles, applications, household appliances, etc., can solve the problem of high temperature creep resistance of cross-linked polyethylene not involving silane, and achieve excellent long-term hydrostatic strength, excellent resistance to The effect of high temperature creep performance

Pending Publication Date: 2022-01-21
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] None of the above patents involves the high temperature creep resistance of silane crosslinked polyethylene

Method used

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  • Silane crosslinked polyethylene resin composition for pipes and method for preparing pipes

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The composition ratio (by weight) of the silane crosslinked polyethylene resin composition for pipes is as follows:

[0030] Polyethylene resin: 100 parts;

[0031] Vinyltrimethoxysilane (A171): 2.0 parts;

[0032] 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane: 0.2 parts;

[0033] Hindered phenol antioxidant: tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester: 0.1 part;

[0034] Phosphite antioxidant: tris[2.4-di-tert-butylphenyl] phosphite: 0.1 part;

[0035] Dibutyltin dilaurate: 0.1 parts.

[0036] Among them, the MFR (190°C, 2.16kg weight) of polyethylene resin is 4.5g / 10min, and the density is 0.949g / cm 3 .

[0037] Preparation method: Add polyethylene resin, unsaturated silane, grafting initiator and antioxidant into the extruder respectively, and in the presence of grafting initiator, polyethylene resin is grafted with unsaturated silane to form silane grafted polymer. Ethylene, and extruded pipe; then under the action of water...

Embodiment 2

[0039] The composition ratio (by weight) of the silane crosslinked polyethylene resin composition for pipes is as follows:

[0040] Polyethylene resin: 100 parts;

[0041] Vinyl tri(methoxy-ethoxy) silane (A-172): 2.0 parts;

[0042] 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane: 0.15 parts;

[0043] Hindered phenol antioxidant: 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanate: 0.15 parts;

[0044]Phosphite antioxidant: tris[2.4-di-tert-butylphenyl] phosphite: 0.15 parts;

[0045] Dibutyltin dilaurate: 0.2 parts.

[0046] Among them, the MFR (190°C, 2.16kg weight) of polyethylene resin is 5.5g / 10min, and the density is 0.948g / cm 3 .

[0047] Preparation method: Add polyethylene resin, unsaturated silane, grafting initiator and antioxidant into the extruder respectively, and in the presence of grafting initiator, polyethylene resin is grafted with unsaturated silane to form silane grafted polymer. Ethylene is extruded into a pipe; then under the action of water and...

Embodiment 3

[0049] The composition ratio (by weight) of the silane crosslinked polyethylene resin composition for pipes is as follows:

[0050] Polyethylene resin: 100 parts;

[0051] Vinyltriethoxysilane (A151): 2.5 parts;

[0052] 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane: 0.1 parts;

[0053] Hindered phenol antioxidant: 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene: 0.2 parts;

[0054] Phosphite antioxidant: tris[2.4-di-tert-butylphenyl] phosphite: 0.2 parts;

[0055] Dibutyltin dilaurate: 0.15 parts;

[0056] Among them, the MFR (190°C, 2.16kg weight) of polyethylene resin is 5.0g / 10min, and the density is 0.950g / cm 3 .

[0057] Preparation method: Add polyethylene resin, unsaturated silane, grafting initiator and antioxidant into the extruder respectively, and in the presence of grafting initiator, polyethylene resin is grafted with unsaturated silane to form silane grafted polymer. Ethylene is extruded into a pipe; then under the action of water and a...

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Abstract

The invention relates to a silane crosslinked polyethylene resin composition for a pipe and a method for preparing the pipe, and belongs to the technical field of pipe preparation, the composition comprises the following components in parts by weight: 100 parts of polyethylene resin, 0.5-4 parts of unsaturated silane, 0.05-0.5 part of a grafting initiator, 0.2-0.5 part of an antioxidant and 0.02-0.2 part of a crosslinking catalyst. The preparation method comprises the following steps: respectively metering polyethylene resin, unsaturated silane, a grafting initiator and an antioxidant, adding into an extruder, grafting with silane in the presence of the initiator to form silane grafted polyethylene, and extruding to form a pipe; and then under the action of water and a crosslinking catalyst, carrying out hydrolysis and condensation reaction to finally obtain the silane crosslinked polyethylene pipe. The silane crosslinked polyethylene pipe prepared from the composition has excellent high-temperature creep resistance, has excellent long-term hydrostatic strength under a high-temperature condition, and can meet the long-term use requirements of hot water pipeline conveying systems such as floor heating and the like.

Description

technical field [0001] The invention belongs to the technical field of pipe preparation, and in particular relates to a silane crosslinked polyethylene resin composition for pipes and a method for preparing pipes. Background technique [0002] In recent years, with the development of the national economy and the continuous expansion of the construction scale, the domestic market has continuously increased the demand for floor heating pipes for buildings, radiator heating pipes and hot water pipes in buildings. Polyethylene pipes for hot water pipes and Its good comprehensive performance has been welcomed more and more, and has become the mainstream of material selection for floor heating piping systems. [0003] At present, the polyolefin pipes that can be used in the hot water pipeline system mainly include cross-linked polyethylene (PE-X) and heat-resistant polyethylene (PE-RT). Ordinary polyethylene has poor heat resistance, and the general use temperature does not excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F230/08B29C48/09B29L23/00
CPCC08F255/02B29C48/09B29L2023/22C08F230/08
Inventor 鲍光复徐振明姜志荣杨文亮
Owner SINOPEC YANGZI PETROCHEM
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