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Radiation crosslinked polyethylene pipe and its preparation method

A polyethylene pipe, radiation cross-linking technology, applied to tubular objects, other household appliances, household appliances, etc., can solve the problems of complex composition, reaction and operation, limit the application range of pipes, and affect the efficiency of extrusion pipes, etc., to achieve saving The effect of removing high-pressure extrusion equipment, reducing equipment fixed investment costs and operating costs, and improving tube extrusion efficiency

Active Publication Date: 2005-09-21
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
[0017] 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

[0032] Prepare the embodiment of diameter D16mm, wall thickness 2.0mm polyethylene pipe material, the following compound high density polyethylene (HDPE) 75Kg, linear low density polyethylene (LLDPE) 24Kg, antioxidant (1010) 0.05Kg, 0.05Kg of antioxidant (168) and 0.9Kg of barium stearate were mixed uniformly at room temperature with a rotating speed of 1200r / min in a high-speed mixer. The above mixture is extruded into a tube at a temperature of 220° C., and irradiated with gamma rays or electron rays at a dose of 110 KGy to transform the linear polymer material into a three-dimensional network cross-linked polymer material. The performance of the radiation crosslinked polyethylene pipe was tested, and the results are as follows: degree of crosslinking: ≥60%, tensile yield strength ≥17MPa, elongation at break ≥400%, hydrostatic stress 4.4MPa, 95°C No leakage and no rupture after 1000 hours of test, no leakage and no rupture after 8760 hours of test under the conditions of hyd...

Embodiment 2

[0034] Prepare the embodiment of D20mm, wall thickness 2.0mm polyethylene pipe material, the following compound high-density polyethylene (HDPE) 90Kg, linear low-density polyethylene (LLDPE) 9Kg, antioxidant (1010) 0.1Kg, anti-oxidant (1010) of commercially available Oxygen agent (168) 0.2Kg, zinc stearate 0.7Kg are in high-speed mixer, at room temperature with rotating speed 1000r / min mix homogeneously. The above mixture is extruded into a tube at a temperature of 195° C., and irradiated with gamma rays or electron rays at a dose of 85 KGy to transform the linear polymer material into a three-dimensional network cross-linked polymer material. The performance of the radiation cross-linked polyethylene pipe is subjected to the above test, and it reaches the standard.

Embodiment 3

[0036] Prepare D18mm, the embodiment of wall thickness 2.0mm polyethylene pipe material, with commercially available following compound high-density polyethylene (HDPE) 80Kg, linear low-density polyethylene (LLDPE) 18.5Kg, antioxidant (1010) 0.2Kg, 0.3Kg of antioxidant (168) and 1.0Kg of zinc stearate were mixed uniformly at room temperature with a rotating speed of 900r / min in a high-speed mixer. The above mixture is extruded into a tube at a temperature of 185° C., and irradiated by gamma rays or electron rays at a dose of 100 KGy to transform the linear polymer material into a three-dimensional network cross-linked polymer material. The performance of the radiation cross-linked polyethylene pipe is subjected to the above test, and it reaches the standard.

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Abstract

The invention relates to a radiation crosslinked polyethylene tube, which has a stereoscopic netted cross-linking molecular structure, and the process comprises: extruding the mixture in a finite proportion of polyvinyl resin, anti-oxidizing agents and stearic acid salt lubricating agents as raw materials in the temperature of less than 235 Deg. C to get the tubes by a tube extruder, then radiating by electron-beams to get the product. The components of the said raw materials is with a proportion of polyvinyl resin of 98.5-99.0 wt%, anti-oxidizing agents of 0.1-0.6 wt% and stearic acid salt lubricating agents of 0.5-1.0 wt%, and the degree of molecular crosslinking in the inner of the said tubes is more than 60 %.

Description

【Technical field】 [0001] The invention relates to a polyethylene pipe material, more specifically, the invention relates to a polyethylene pipe material with a network crosslinked 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 some applications such as pipes for conveying materials. Its molecular structure is modified into a three-dimensional network cross-linked molecular structure. At present, there are chemical methods for manufacturing cross-linked polyethylene materials and their 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 perox...

Claims

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Application Information

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