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Forming method for modified polytetrafluoroethylene plastic product

A polytetrafluoroethylene and molding method technology, applied in the field of plastic processing, can solve the problems of poor compatibility, difficult to remove volatile components, low product compactness, etc., to achieve increased density and thermal expansion coefficient, high compactness Effect

Active Publication Date: 2015-06-24
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PTFE plastic is a non-stick material, its compatibility with modified fillers is not good, which greatly affects the bonding force between PTFE resin and modified materials, as well as the volatilization in modified materials. Difficult to remove ingredients, resulting in low product density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Polyphenylene modified PTFE plastic rod, product size: Φ100×100

[0027] (1) According to the formula requirements, polyphenylene modified materials are selected, the ratio of polytetrafluoroethylene resin to polyphenylene resin is 8:2, mixed evenly in a three-dimensional mixer, and sieved twice for later use.

[0028] (2) According to the size of Φ100×100 bar product, weigh 1600 grams of mixture and add it into the mold.

[0029] (3) According to the cross-sectional area of ​​the product, the required press pressure is calculated to be 30 tons, and the process of pressing and holding the pressure for 5 seconds is carried out according to the requirements of the pressing process of PTFE plastic products. The pressing pressure is:

[0030] F=P*S, F is the required press pressure, P is the required pressure per product unit, and S is the area of ​​the pressure-bearing surface.

[0031] ⑷ After the pressure holding time is completed, the rough product can be taken out ac...

Embodiment 2

[0043] Product size: 500×500×10(mm)

[0044] ⑴According to the formula requirements, the ratio of PTFE resin to glass fiber powder is 8:2. Mix evenly in a three-dimensional mixer, and sieve 2 to 4 times for later use;

[0045] ⑵According to the 500×500×10 (mm) plate, the calculated material requirement is 5250 grams, weigh 5250 grams of the mixture and add it into the mold.

[0046] ⑶According to the cross-sectional area of ​​the product, the formula for calculating the press pressure is F=P*S, where F is the required press pressure, P is the required pressure per product unit, and S is the pressure-bearing surface area.

[0047] Obtain the required press pressure of 750 tons, and carry out the technological process of pressing, exhausting and maintaining pressure according to the requirements of the pressing process of polytetrafluoroethylene plastic products. The holding time is 8s.

[0048] ⑷ After the pressure holding time is completed, the rough product can be taken ou...

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Abstract

The invention provides a forming method for a modified polytetrafluoroethylene plastic product. The forming method comprises the following steps: uniformly mixing polytetrafluoroethylene resin and modified fillers in a three-dimensional mixer, and sieving for 2-4 times for later use; weighing according to the size of a product, and adding into a mold; calculating the pressure of a pressing machine according to the size of the cross section of the product, and carrying out pressing, exhausting and pressure maintenance according to the requirement of the pressing process of the polytetrafluoroethylene plastic product, after the pressure maintenance time is finished, taking out a blank product; and sintering according to a sintering curve, putting the sintered blank product into a hot-pressing mold, and carrying out temperature rising and temperature maintaining again according to a temperature rising curve. The method provided by the invention is used for manufacturing products of pipes, plates and rods in the filled modified polytetrafluoroethylene plastic product, the compactness of the obtained product is high, and all performances such as the tensile strength, the breaking elongation, the compression strength, the compression elastic modulus, the friction coefficient, the average wear coefficient, the density and the thermal expansion coefficient of the product are improved to a great extent.

Description

technical field [0001] The invention belongs to the field of plastic processing, and in particular relates to a processing method for polytetrafluoroethylene plastic containing modified materials. Background technique [0002] PTFE has atmospheric aging resistance, radiation resistance, low permeability, non-combustibility and acid and alkali resistance, and has a wide range of applications in the industrial field. At the same time, PTFE also has processing defects, such as poor wear resistance, easy cold flow, poor thermal conductivity, etc. It is a commonly used method in the field of plastic processing by mixing with modified fillers. [0003] The extremely low surface activity and non-stickiness of PTFE limit its compounding with other materials. To solve the bonding problem of PTFE, the surface tension of PTFE can be increased through the surface activation of PTFE, and then a suitable adhesive can be selected for bonding. Another modification method is filling modific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00
Inventor 温汉东陈程
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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