Preparation method of low-shrinkage polytetrafluoroethylene raw material membrane for aerospace wire

A technology of polytetrafluoroethylene and low shrinkage, which is applied in the field of plastic processing, can solve problems such as not being able to meet product needs, and achieve the effect of reducing weight and transverse shrinkage

Inactive Publication Date: 2017-01-25
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lateral shrinkage of the raw material film prepared by this method is much higher than the relevant technical requirements of aviation wires, which cannot meet the needs of the product

Method used

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  • Preparation method of low-shrinkage polytetrafluoroethylene raw material membrane for aerospace wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] ①Mix the dispersed polytetrafluoroethylene resin and solvent oil according to the ratio of 100:25;

[0022] ② Press the mixture into a cylindrical green body with a pressure of 1.8 MPa and a holding time of 5 minutes;

[0023] ③Put the cylindrical green body into the pusher and press it to obtain a round bar. The pushing speed is 1mm / s, the pushing temperature is 35°C, and the size of the pushing die is Φ16mm;

[0024] ④The round bar is passed through a calendering machine to make a film. The diameter of the roller of the calendering machine is 600mm, the thickness of the film is 0.09mm, and the exit speed of the film calendering is 2m / min;

[0025] ④ Pass the film through a low-temperature drying tunnel to remove the extrusion aid. The temperature of the drying tunnel is 200°C and the length is 5m;

[0026] ⑤ The film is subjected to high-temperature shrinkage treatment through a high-temperature drying tunnel. The temperature of the drying tunnel is 300° C. and the l...

Embodiment 2

[0028] ①Mix the dispersed polytetrafluoroethylene resin and kerosene according to the ratio of 100:25;

[0029] ② Press the mixture into a cylindrical green body with a pressure of 1.5 MPa and a holding time of 8 minutes;

[0030] ③Put the cylindrical green body into the pusher and press it to obtain a round bar. The pushing speed is 2mm / s, the pushing temperature is 50°C, and the size of the pushing die is Φ10mm;

[0031] ④The round bar is passed through a calendering machine to produce a film. The diameter of the roller of the calendering machine is 600mm, the thickness of the film is 0.04mm, and the exit speed of the film calendering is 1.5m / min;

[0032] ④ Pass the film through a low-temperature drying tunnel to remove the extrusion aid. The temperature of the drying tunnel is 180°C and the length is 8m;

[0033] ⑤ The film is subjected to high-temperature shrinkage treatment through a high-temperature drying tunnel. The temperature of the drying tunnel is 250 ° C and the...

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Abstract

The invention relates to a preparation method of a low-shrinkage polytetrafluoroethylene raw material membrane for an aerospace wire. The method comprises the concrete steps of mixing dispersing type polytetrafluoroethylene resin and an extrusion additive, preforming, pushing and pressing, calendering, degreasing at low temperature, and shrinking at high temperature. The low-shrinkage polytetrafluoroethylene raw material membrane is mainly used for preparing various aerospace wires, and can be used for a long time at the temperature of minus 55 DEG C to 260 DEG C. The polytetrafluoroethylene raw material membrane prepared through the method can be beneficial to effectively reduce the material lateral shrinkage, and reduce the weight of each aerospace wire.

Description

technical field [0001] The invention belongs to the field of plastic processing, and in particular relates to a preparation method of a polytetrafluoroethylene raw material film for aviation wires with low shrinkage rate. Background technique [0002] PTFE material has the advantages of corrosion resistance, weather resistance, high and low temperature resistance, etc., and is widely used in important sectors such as national defense and military industry, atomic energy, petroleum, radio, electrical machinery, and chemical industry. Compared with the traditional PTFE raw film, the PTFE raw film for low-shrinkage aviation wires has a lower lateral shrinkage, which can effectively reduce the overlapping rate of aviation wires, thereby reducing the weight of the wires. [0003] The existing patent introduces a preparation method of polytetrafluoroethylene raw material film. The method is to push out a rod, then calender it into a film, and then degrease it through a low-tempera...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B29D7/01C08L27/18C08L91/00
CPCB29D7/01C08J5/18C08J2327/18C08J2491/00C08L27/18C08L2203/16
Inventor姚磊
OwnerSHANGHAI PLASTICS RES INST CO LTD