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Radiation crosslinked polyethylene pipe and its preparation method

A polyethylene pipe, radiation cross-linking technology, applied in the direction of tubular articles, other household appliances, household appliances, etc., can solve the problems of complex composition, reaction and operation, limit the application scope of the pipe, affect the efficiency of extrusion pipe, etc. The effect of removing high-pressure extrusion equipment, equipment fixed investment costs and operating costs, and improving pipe extrusion efficiency

Active Publication Date: 2006-11-01
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, besides foaming agent and antioxidant, additives such as sensitizing cross-linking agent, nucleating agent and activator are added to the raw materials. It will produce a substance with high viscosity, which will affect the efficiency of squeezing the tube, and also limit the application range of the tube
[0016] The above-mentioned technologies all have a common disadvantage: both radiation cross-linking equipment and chemical cross-linking additives and equipment are used, the investment cost is too high, and the operation cost is also high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An example of preparing a polyethylene pipe with a diameter of D16mm and a wall thickness of 2.0mm, the following commercially available compounds: high-density polyethylene (HDPE) 75Kg, linear low-density polyethylene (LLDPE) 24Kg, antioxidant (1010) 0.05Kg, Antioxidant (168) 0.05Kg and barium stearate 0.9Kg are mixed uniformly in a high-speed mixer at room temperature at a rotation speed of 1200r / min. The above mixture is extruded into a tube at a temperature of 220°C, and irradiated with gamma rays or electron rays with a radiation dose of 110KGy, so that the linear polymer material is transformed into a three-dimensional network crosslinked polymer material. The performance of the radiation cross-linked polyethylene pipe was tested, and the results were as follows: Cross-linking degree: ≥60%, tensile yield strength ≥17MPa, elongation at break ≥400%, hydrostatic stress at 4.4MPa and 95℃ There is no leakage and no rupture in the test for 1000 hours, no leakage and no rupt...

Embodiment 2

[0033] An example of preparing a polyethylene pipe with a thickness of D20mm and a wall thickness of 2.0mm, the following commercially available compounds: high-density polyethylene (HDPE) 90Kg, linear low-density polyethylene (LLDPE) 9Kg, antioxidant (1010) 0.1Kg, anti-oxidant Oxygen (168) 0.2Kg and zinc stearate 0.7Kg are mixed uniformly in a high-speed mixer at room temperature at a rotation speed of 1000r / min. The above mixture is extruded into a tube at a temperature of 195° C., and irradiated with gamma rays or electron rays with a radiation dose of 85 KGy, so that the linear polymer material is transformed into a three-dimensional network cross-linked polymer material. The performance of the radiation cross-linked polyethylene pipe was tested above and reached the standard.

Embodiment 3

[0035] An example of preparing a polyethylene pipe of D18mm and a wall thickness of 2.0mm, the following commercially available compounds: high-density polyethylene (HDPE) 80Kg, linear low-density polyethylene (LLDPE) 18.5Kg, antioxidant (1010) 0.2Kg, Antioxidant (168) 0.3Kg and zinc stearate 1.0Kg are mixed uniformly in a high-speed mixer at room temperature at a rotation speed of 900r / min. The above mixture is extruded into a tube at a temperature of 185° C., and irradiated by gamma rays or electron rays with a radiation dose of 100 KGy, so that the linear polymer material is transformed into a three-dimensional network cross-linked polymer material. The performance of the radiation cross-linked polyethylene pipe was tested above and reached the standard.

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Abstract

The invention relates to a radiation crosslinked polyethylene pipe, which has a three-dimensional network crosslinked molecular structure, and the pipe is made of a certain proportion of mixed polyethylene resin, antioxidant and stearate lubricant. The raw material is extruded into a tube by a tube extruder at a temperature below 235°C, and then irradiated by electron rays; the ratio of each component in the raw material is: polyethylene resin 98.5-99.0%wt, antioxidant 0.1 ~0.6%wt, stearate lubricant 0.5~1.0%wt; molecular crosslinking degree inside the pipe ≥60%. The invention provides a radiation cross-linked polyethylene pipe material which does not need to add a cross-linking agent, has low raw material cost, high extrusion production efficiency and high chemical purity of the product.

Description

【Technical Field】 [0001] The invention relates to a polyethylene pipe, more specifically, the invention relates to a polyethylene pipe with a network cross-linked molecular structure and a preparation method thereof. 【Background technique】 [0002] Polyethylene is a polymer resin with a linear polymer structure. It has a very wide range of applications in the national economy. However, because its molecular structure is linear, it must be used in certain applications such as pipes for conveying materials. The molecular structure is modified into a three-dimensional network of cross-linked molecular structure. At present, there are chemical methods for manufacturing cross-linked polyethylene materials and pipes, such as silane cross-linking method and peroxide cross-linking method, among which: [0003] The silane crosslinking method uses vinyl silane containing double bonds to react with molten polyethylene under the action of an initiator (usually a peroxide) to form a silane gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08J7/00B29C70/50B29D23/00
Inventor 李永鸿周锰田立陈广建吕波谭蔚明
Owner FSPG HI TECH
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