Method for preparing special material for pipeline by crosslinking modifying of polyethylene

A polyethylene cross-linking and pipe-specific material technology, which is applied in the field of polymer material preparation, can solve the problems of reduced cross-linking degree of pipe material, poor mechanical properties, and high energy consumption of equipment, so as to avoid pre-crosslinking, The effect of reducing energy consumption and improving the uniformity of crosslinking

Inactive Publication Date: 2017-06-13
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional cross-linked polyethylene used to prepare cross-linked polyethylene pipes is mainly made of silane cross-linked polyethylene. This cross-linked polyethylene is easy to absorb due to uneven dispersion of silane and initiator and special materials during storage and transportation. Moisture in the air produces pre-crosslinking phenomenon, which leads to the formation of gel blocks in the extruder, that is, vinyl silane is hydrolyzed to form silanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing special pipe materials through cross-linking modification of polyethylene, the production steps of which are:

[0017] In the first step, the polyethylene pellets were dried in an oven at 75°C for 8 hours, and the dried polyethylene pellets and 0.05phr of polymerization inhibitor 701, 0.1phr of antioxidant 1010, and 0.1phr of antioxidant Agent 412S and 0.1phr antioxidant 697 were placed in a high-speed mixer and mixed at a speed of 800r / min for 20min;

[0018] The second step is to adjust and heat the temperature of the first zone to the seventh zone of the twin-screw extruder. The set temperature is gradually increased from 140°C in the first zone to 210°C in the seventh zone, and the material obtained in the first step is added through the feed port of the extruder. The silane coupling agent VTMS of 1.5phr and the initiator DCP of 0.04phr are pumped by the metering pump in the third zone of the extruder barrel through atomization and spraying, a...

Embodiment 2

[0024] A method for preparing special pipe materials through cross-linking modification of polyethylene, the production steps of which are:

[0025] In the first step, the polyethylene pellets were dried in an oven at 75°C for 8 hours, and the dried polyethylene pellets and 0.05phr of polymerization inhibitor 701, 0.1phr of antioxidant 1010, and 0.1phr of antioxidant Agent 412S and 0.1phr antioxidant 697 were placed in a high-speed mixer and mixed at a speed of 1000r / min for 25min;

[0026] The second step is to adjust and heat the temperature of the first zone to the seventh zone of the twin-screw extruder, and the set temperature is gradually increased from 130°C in the first zone to 205°C in the seventh zone, and the material obtained in the first step is added from the feed port of the extruder. The 2.0phr silane coupling agent VTMS and the 0.06phr initiator DCP are pumped into the third zone of the extruder barrel by means of atomization and spraying by the metering pump,...

Embodiment 3

[0032] A method for preparing special pipe materials through cross-linking modification of polyethylene, the production steps of which are:

[0033] In the first step, the polyethylene pellets were dried in an oven at 85°C for 5 hours, and the dried polyethylene pellets and 0.15phr of polymerization inhibitor 701, 0.3phr of antioxidant 1010, and 0.1phr of antioxidant Agent 412S, 0.2phr antioxidant 697 were placed in a high-speed mixer and mixed at a high speed of 1200r / min for 30min;

[0034] The second step is to adjust and heat the temperature of the first zone to the seventh zone of the twin-screw extruder, and the set temperature is gradually increased from 120°C in the first zone to 200°C in the seventh zone, and the material obtained in the first step is added through the feed port of the extruder. The 2.5phr silane coupling agent VTMS and the 0.08phr initiator DCP are pumped into the third zone of the extruder barrel by means of atomization and spraying by the metering ...

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Abstract

The invention relates to a method for preparing a special material for a pipeline by crosslinking modifying of polyethylene. The method specifically comprises the following steps of mixing polyethylene particles, a polymerization inhibitor 701 and three types of antioxidants 1010, 412S and 697, adding into an extrusion machine, pumping a silane coupler VTMS and an initiator DCP into the extrusion machine in an atomizing and spraying way, extruding a melt, cooling, and cutting particles, so as to obtain a special material A for the pipeline; mixing the dried polyethylene particles and dibutyltin dilaurate, di-n-butyltin dilaurate and three types of antioxidants 1010, 412S and 697, feeding into the extrusion machine, extruding by the extrusion machine, cooling, and granulating, so as to obtain a special material B for the pipeline; mixing the material A and the material B according to a ratio, so as to prepare the special material for the pipeline. The method has the advantages that by adding the polymerization inhibitor, the pre-crosslinking of the polyethylene is avoided; by adding the silane coupler VTMS and the initiator DCP, the crosslinking degree and uniformity are improved, and the generation of gel blocks is avoided; by adding the three types of antioxidants as an anti-aging system, the anti-aging property of a product is improved, and the environment cracking-resistant ability of the pipeline is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer materials, and relates to a method for preparing special pipe materials through cross-linking modification of polyethylene (PE). Background technique [0002] Polyethylene (PE) is one of the main plastic raw materials in the five general-purpose plastics (PVC, PE, PS, PP, ABS), and is also the chemical product with the largest output of ethylene derivatives, accounting for about 50% of ethylene consumption. However, polyethylene has poor high temperature resistance, mechanical properties and anti-aging chemical properties can not meet the requirements of use, and cross-linked polyethylene has a unique molecular structure (three-dimensional network thermosetting structure) and excellent properties (such as high compressive strength) , high heat resistance, good corrosion resistance), just to make up for this gap, so its products have been widely used in floor heating, heating and coo...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K5/134C08K5/372C08K5/20C08K5/5425C08K5/14C08K5/57C08K5/00C08J3/24C08F255/02C08F230/08B29B9/06B29C47/92B29C48/92
CPCC08K5/1345B29B9/06B29C48/92B29C2948/9258B29C2948/92704C08F255/02C08J3/24C08J2323/06C08K5/00C08K5/14C08K5/20C08K5/372C08K5/5425C08K5/57C08L2203/18C08L2312/08C08L23/06C08F230/08
Inventor 刘旭田小艳杨金明汤粤豫王波黄捷高超峰王悦
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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