Polytetrafluoroethylene isostatic pressure molding device and pipeline lining method by aid of same

Abstract

The invention discloses a lining molding device used on chemical equipment and a lining method, and provides a polytetrafluoroethylene isostatic pressure molding device and a lining method. The polytetrafluoroethylene isostatic pressure molding device is smart in conception and fine in performance, a pipe molded by the aid of the polytetrafluoroethylene isostatic pressure molding device is high in strength, and the polytetrafluoroethylene pipe can be tightly lined in a pipeline by the aid of the lining method, and the technical problems of low polytetrafluoroethylene lining density, poor tensile strength and permeation resistance and the like due to insufficient molding pressure of an existing polytetrafluoroethylene molded pipe of the prior are solved. The method includes integrally placing a mold below the liquid level of a high-pressure cabin of an isostatic pressure machine; pressurizing the high-pressure cabin to process pressure and leading a polytetrafluoroethylene blank to be in cold press molding; adopting an isostatic pressure process; sintering a blank part released from the mold, drawing down the blank part, and placing the blank part into the pipeline; realizing memory rebounding of a polytetrafluoroethylene pipe blank after heating; and leading the polytetrafluoroethylene pipe lining to be lined in the pipeline. The lining is fine in high-temperature resistance and high-pressure resistance, and full-vacuum service requirements under the condition with high temperature of 232 DEG C are met.

Description

[0001] technical field [0002] The invention relates to a lining forming device and a lining method for chemical equipment, in particular to a polytetrafluoroethylene isostatic pressing forming device with simple forming, high strength and reliable performance and a pipeline lining method using the device. Background technique [0003] With the development of the chemical industry, the demand for lined pipelines is also increasing. Because PTFE has good properties such as high and low temperature resistance, corrosion resistance, and weather resistance, PTFE lining is more popular. Especially in silicone, aniline and other projects, the existing PTFE-lined pipes generally adopt the isobaric process, that is, the pipe steel shell itself is used as a part of the lining mold in the production process, because the pipe steel shell cannot withstand polytetrafluoroethylene. When the process pressure of tetrafluoroethylene is formed, when the pressure reaches 40% of the forming pr...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly provides a polytetrafluoroethylene isostatic pressing molding device with ingenious conception, high strength and good performance for forming tubes, which solves the problem of polytetrafluoroethylene forming tubes caused by insufficient forming pressure in the prior art. Tetrafluoroethylene lining has low density, poor tensile strength, poor penetration resistance and other technical problems

The forming device skillfully utilizes the principle of internal and external water pressure balance, and the concept is ingenious. The forming tube has high strength and good quality, which solves the problem of PTFE forming tube caused by insufficient forming pressure in the prior art. Ethylene-lined pipe has low density, poor tensile strength, poor permeability resistance and other technical problems

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