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A kind of ultra-high molecular weight polyethylene pipe and its production process

A technology of ultra-high molecular weight polyethylene pipes, which is applied in the direction of tubular objects, other household utensils, household utensils, etc. It can solve the problems of affecting product performance, poor surface quality of pipes, and poor processability, etc., to achieve simple production equipment and improve surface quality. Quality and performance, cost reduction effect

Active Publication Date: 2021-12-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production method of ultra-high molecular weight polyethylene pipes is usually directly extruded by an extruder. Due to the poor processing performance of ultra-high molecular weight polyethylene, it is difficult for the plastic melt to reach a completely molten state and form a unified state, which makes extrusion The surface quality of the pipe is poor, which affects the performance of the product

Method used

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  • A kind of ultra-high molecular weight polyethylene pipe and its production process
  • A kind of ultra-high molecular weight polyethylene pipe and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The ultra-high molecular weight polyethylene pipe extruded by the above-mentioned ultra-high molecular weight polyethylene pipe production equipment has an inner wall layer of ultra-high molecular weight polyethylene (UHMWPE), and an outer wall sacrificial layer of low-density polyethylene (LDPE).

[0037] The method includes:

[0038] A double-layer co-extruded pipe die is adopted, and the main transmission device of the extruder is a screw transmission device. The diameter of the screw is 90mm, the length-to-diameter ratio of the screw is L / D=25, the screw speed is 12-15r / min, and the feeding speed is 12- 15kg / h, used to extrude ultra-high molecular weight polyethylene (UHMWPE); the auxiliary machine transmission device of the extruder is a screw transmission device, the screw diameter is 65mm, the screw length-to-diameter ratio L / D=28, and the screw speed is 20-25r / min, feeding speed 25-30kg / h, used to extrude low-density polyethylene sacrificial layer (LDPE). The ...

Embodiment 2

[0040]The ultra-high molecular weight polyethylene pipe extruded by the above-mentioned ultra-high molecular weight polyethylene pipe production equipment has an inner wall layer of ultra-high molecular weight polyethylene (UHMWPE), and an outer wall sacrificial layer of low-density polyethylene (LDPE).

[0041] The method includes:

[0042] A double-layer co-extruded pipe die is adopted, in which the main drive of the extruder is a screw drive, the diameter of the main screw of the extruder is 120mm, the length-to-diameter ratio of the screw is L / D=25, the screw speed is 10-15r / min, and the feeding speed 15-20kg / h, used to extrude ultra-high molecular weight polyethylene (UHMWPE); the auxiliary drive device of the extruder is a screw drive device, the screw diameter is 60mm, the screw length-to-diameter ratio L / D=25, and the screw speed is 15- 25r / min, feeding speed 20-25kg / h, used to extrude low-density polyethylene sacrificial layer (LDPE). The barrel of the main extruder ...

Embodiment 3

[0044] The ultra-high molecular weight polyethylene pipe extruded by the above-mentioned ultra-high molecular weight polyethylene pipe production equipment has an inner wall layer of ultra-high molecular weight polyethylene (UHMWPE), and an outer wall sacrificial layer of low-density polyethylene (LDPE).

[0045] The method includes:

[0046] A double-layer co-extruded pipe die is adopted, and the main drive of the extruder is a screw drive. The diameter of the main screw of the extruder is 80mm, the length-to-diameter ratio of the screw is L / D=25, the screw speed is 10-15r / min, and the feeding speed 15-20kg / h, used to extrude ultra-high molecular weight polyethylene (UHMWPE); the auxiliary machine transmission device of the extruder is a screw transmission device, the screw diameter is 75mm, the length-to-diameter ratio of the screw is L / D=20, and the screw speed is 15- 25r / min, feeding speed 20-25kg / h, used to extrude low-density polyethylene sacrificial layer (LDPE). The b...

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Abstract

The invention discloses an ultra-high molecular weight polyethylene pipe and a production process thereof. The process includes: extruding ultra-high molecular weight polyethylene material into the machine head, extruding low-density polyethylene material into the machine head, the two materials meet at the machine head, extruded into a composite pipe from the machine head, ultra-high molecular weight polyethylene material The ethylene material forms the inner wall layer of the composite pipe, and the low-density polyethylene material forms the outer wall layer of the composite pipe; the outer wall layer is removed from the composite pipe through turning to obtain the ultra-high molecular weight polyethylene pipe. While ensuring the excellent performance of ultra-high molecular weight polyethylene pipes, the invention utilizes the lubricity of low-density polyethylene to improve defects such as surface quality and mechanical strength decline caused by melt fracture; its production equipment has the advantages of simple modification and relatively low cost. low merit.

Description

technical field [0001] The invention belongs to the technical field of plastic pipe processing, in particular to an ultra-high molecular weight polyethylene pipe and its production process. Background technique [0002] Ultra-high molecular weight polyethylene is a high-molecular thermoplastic engineering plastic with excellent comprehensive properties. It has super wear resistance, self-lubrication, high strength, stable chemical properties, and strong anti-aging performance. However, ultra-high molecular weight polyethylene has extremely poor fluidity in the molten state, and its melt index is almost zero, which greatly affects its processing performance. UHMWPE currently commonly used processing methods include pressing sintering, extrusion molding and injection molding. Ultra-high molecular weight polyethylene pipes use ultra-high molecular weight polyethylene as the main raw material. In addition to inheriting the excellent characteristics of raw materials, they also h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06B29D23/00
CPCC08L23/06B29D23/001C08L2203/18C08L2207/068
Inventor 曹贤武金圣桥何光建
Owner SOUTH CHINA UNIV OF TECH