Preparation method of high thermal stretching high molecular weight polyethylene sheet

Abstract

The invention provides a preparation method of a high-ratio hot-stretched high molecular weight polyethylene sheet. The preparation method comprises the following steps: 1, taking 95 parts of ultra-high molecular weight polyethylene resin, 4.5 parts of polyethylene wax and 0.5 part of carbon black by weight, mixing the raw materials, placing the mixed raw materials in a single-screw extruder, and extruding the mixed raw materials to obtain a plate blank, wherein a sheet extrusion die is mounted at the outlet of the single-screw extruder; 2, leading the plate blank into a first calender for calendering to obtain a preformed plate blank; 3, leading the preformed plate blank into a hot channel for heating, and leading the heated preformed plate blank into a calendar for calendering to obtain a preformed sheet; 4, leading the preformed sheet into a hot channel for heating, and leading the heated preformed sheet into the calendar for calendering to obtain a finished sheet; and 5, placing the formed sheet in a heat-setting machine for heat setting to obtain the high-ratio hot-stretched high molecular weight polyethylene sheet. The sheet prepared according to the method provided by the invention has extremely smooth surfaces, a light weight and a small thickness, and thus can be widely adhered to the surfaces of various objects such as ship bodies and submarines, which are scaled and corroded easily.

Description

technical field [0001] The invention relates to a high-molecular-weight polyethylene material, and relates to a method for preparing a high-molecular-weight polyethylene sheet for high-power stretching. Background technique [0002] Due to the advantages of impact resistance, wear resistance and corrosion resistance, high molecular weight polyethylene is gradually being popularized and applied in industry. The current application is mainly for pipes. The application of the board is mainly tried out on civilian products. These high-molecular-weight polyethylene sheets are relatively thick, with a tensile strength below 25MPa, a hardness of about 45, and low tensile strength and elastic modulus. The performance and price advantages of the application in the industrial field are not obvious. Ultra-high molecular weight polyethylene film has several obvious weaknesses: first, because the melt index of ultra-high molecular weight polyethylene is zero, the screw extrusion is ex...

AI Technical Summary

Problems solved by technology

Ultra-high molecular weight polyethylene film has several obvious weaknesses: first, because the melt index of ultra-high molecular weight polyethylene is zero, the screw extrusion is extremely slow, the production process is slow, and the cycle is long, which affects the market competitiveness of the product; second , Ultra-high molecular weight polyethylene raw materials are about 20% more expensive than high-molecular-weight polyethylene raw materials, resulting in an increase in product costs; third, ultra-high-molecular-weight polyethylene molecular chains are too long, so it is not easy to weld and heat-melt, which makes it difficult to make downstream products

Ultra-high molecular weight polyethylene diaphragms are extruded from pipes with screws, and then the pipes are cut and flattened to produce blanks. As a result, there are internal stresses in the product diaphragms, which cause the products to be easily twisted and deformed, affecting their use value

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