Ultra-high molecular weight polyethylene processing formula

An ultra-high molecular weight, polyethylene technology, applied in the field of polyethylene processing, which can solve the problems of low shear rate, pores, and easy melt rupture.

Inactive Publication Date: 2022-01-25
KUNSHAN HENGGUANG PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low critical shear rate, the melt is easily broken during extrusion molding, and cracks are prone to appear on the surface; during injection molding, a jet flow state will appear, causing pores and delamination

Method used

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  • Ultra-high molecular weight polyethylene processing formula

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The ultra-high molecular weight polyethylene processing formula is composed of the following components by weight: 70 parts of UHMWPE, 10 parts of MDPE, 1 part of pyrogenic silica as a nucleating agent, 30 parts of liquid crystal polymer, 0.8 parts of flow modifier, and nano-layered silicate 3 copies. The average molecular weight of MDPE is less than 400,000.

[0015] The flow modifier is a high-efficiency flow modifier (MS2) researched by Xu Dingyu, Beijing University of Chemical Technology.

[0016] Ultra-high molecular weight polyethylene is processed and molded in a screw extruder, with an injection temperature of 240°C, a holding pressure of 5MPa, and an injection pressure of 10MPa. The injection mold temperature is 80°C, and the cooling time after injection is 1min.

Embodiment 2

[0018] The ultra-high molecular weight polyethylene processing formula consists of the following components by weight: 100 parts of UHMWPE, 40 parts of LDPE, 1.5 parts of nucleating agent silica, 5 parts of liquid crystal polymer, 1 part of flow modifier, nano-layered silicate 5 servings.

[0019] The flow modifier is a high-efficiency flow modifier (MS2) researched by Xu Dingyu, Beijing University of Chemical Technology.

[0020] Ultra-high molecular weight polyethylene is processed and molded in a screw extruder, with an injection temperature of 300°C, a holding pressure of 4MPa, and an injection pressure of 9MPa. The injection mold temperature is 60°C, and the cooling time after injection is 2 minutes.

Embodiment 3

[0022] The ultra-high molecular weight polyethylene processing formula consists of the following components by weight: 80 parts of UHMWPE, 250 parts of HDPE, 1.2 parts of nucleating agent sodium stearate, 20 parts of liquid crystal polymer, 0.9 parts of flow modifier, nano-layered silicic acid 4 parts of salt. The average molecular weight of HDPE is 400,000-500,000.

[0023] The flow modifier is a high-efficiency flow modifier (MS2) researched by Xu Dingyu, Beijing University of Chemical Technology.

[0024] Ultra-high molecular weight polyethylene is processed and molded in a screw extruder, with an injection temperature of 270°C, a holding pressure of 4.5MPa, and an injection pressure of 9MPa. The injection mold temperature is 70°C, and the cooling time after injection is 1.5min.

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Abstract

The invention discloses an ultra-high molecular weight polyethylene (UHMWPE) processing formula which comprises the following components in parts by weight: 70-100 parts of UHMWPE, 10-40 parts of high-fluidity resin, 1-1.5 parts of a nucleating agent, 5-30 parts of a liquid crystal polymer, 0.8-1 part of a flow modifier and 3-5 parts of nano layered silicate. According to the invention, the melt flow index of UHMWPE is improved, and processing of a common extruder is facilitated.

Description

technical field [0001] The invention belongs to the technical field of polyethylene processing, in particular to a processing formula for ultra-high molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE), compared with HDPE, has a molecular weight as high as 2 million to 4 million. Because the molecular weight is too high, it has completely different properties from HDPE. HDPE is a general-purpose thermoplastic, while UHMWPE is a comprehensive performance. Excellent engineering thermoplastics. [0003] UHMWPE has outstanding wear resistance, which is 8-9 times higher than steel and 2.8 times higher than nylon. It has excellent impact resistance, which is 2-5 times that of PC, 5 times that of ABS, and 1.5 times that of POM; the friction coefficient is only 0.1- 0.22, is an ideal self-lubricating material, in addition, its chemical resistance, low temperature resistance, noise reduction, stress cracking resistance, etc. ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L101/12C08L21/00C08K3/34C08K7/00C08K3/36
CPCC08L23/06C08L2207/068C08L2207/062C08L2207/066C08L2207/24C08K2201/011C08K2201/014C08L101/12C08K3/34C08K7/00C08K3/36C08K5/098C08L23/12C08L21/00
Inventor 邓国权尹克武
Owner KUNSHAN HENGGUANG PLASTIC PROD
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