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Preparation method of teflon microporous film baseband

A technology of polytetrafluoroethylene and microporous membranes, which can be applied to flat products, applications, household appliances, etc., can solve problems such as increased production costs, waste, and baseband failure to meet requirements, so as to improve quality, increase utilization, and reduce The effect of production costs

Inactive Publication Date: 2008-07-02
江西天润天和新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the basis of biaxial stretching, the manufacture of base tape also plays a key role in the production of microporous membranes. The existing base tape manufacturing technology has become a bottleneck for improving the quality of microporous membranes, mainly in the following aspects, (1) In the baseband manufacturing process, the gap between the pressure rollers is still manually adjusted to achieve the purpose of controlling the uniformity, so that the actual manufactured baseband cannot meet the requirements; The single section of the film is only between 100m and 200m, and it will generate a lot of waste and increase the production cost when it is used in the compounding of clothing fabrics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The processing method described in the present embodiment is as follows:

[0026] a) polytetrafluoroethylene resin powder and solvent with molecular weight at 2,000,000-8,000,000, described solvent is No. 3 aviation kerosene and isoparaffin, by polytetrafluoroethylene: No. 3 aviation kerosene: the weight of isoparaffin The ratio is 1:0.1:0.2 and mixed evenly, and left to stand at 45°C-55°C for 24 hours to make it fully mixed.

[0027] b) Pour the mixed granules into a pre-compression molding machine, and uniformly and slowly press it into a polytetrafluoroethylene rod with a pressure of 75kg-80kg. The compression time is 25 minutes, and the pre-compression temperature is 65°C. 12cm, the length is 100cm, and the material rod is taken out by the parison take-out machine.

[0028] c) Gently put the material rod into the material chamber of the pusher, preheat it at 50-60°C for 40 minutes, and then further extrude it into a thinner material rod with a diameter of 2cm-10cm....

Embodiment 2

[0031] In the present embodiment, its processing method is as follows:

[0032] It is planned that the production thickness is 100 microns, and the base tape with a width of 200 mm. The diameter of the mold of the material rod is 12 cm, and the length is 100 cm. The length is 100cm.

[0033] a) polytetrafluoroethylene resin powder and solvent with molecular weight at 2,000,000-8,000,000, described solvent is No. 3 aviation kerosene and isoparaffin, by polytetrafluoroethylene: No. 3 aviation kerosene: the weight of isoparaffin The ratio is 1: 0.1: 0.2 and mixed evenly, and left to stand at 55°C-65°C for 36 hours to make it fully mixed.

[0034] b) Pour the mixed granules into a pre-compression molding machine, and uniformly and slowly press it into a polytetrafluoroethylene rod with a pressure of 100 kg. The pressing time is 25 minutes, the pre-compression temperature is 60 ° C, and the resulting diameter is 12 cm. The length is 100cm, and the material rod is taken out by the...

Embodiment 3

[0038] In the present embodiment, its processing method is as follows:

[0039] It is planned to produce a base tape with a thickness of 200 microns and a width of 300 mm. The diameter of the mold of the material rod is 32 cm and the length is 200 cm. The length is 200cm.

[0040]a) polytetrafluoroethylene resin powder and solvent with molecular weight at 2,000,000-8,000,000, described solvent is No. 3 aviation kerosene and isoparaffin, by polytetrafluoroethylene: No. 3 aviation kerosene: the weight of isoparaffin The ratio is 1: 0.15: 0.3 and mixed evenly, and left to stand at 40°C-55°C for 48 hours to make it fully mixed.

[0041] b) Pour the mixed granules into a pre-compression molding machine, and uniformly and slowly press it into a polytetrafluoroethylene rod with a pressure of 160 kg. The pressing time is 25 minutes, the pre-compression temperature is 60 ° C, and the resulting diameter is 32 cm. The length is 200cm, and the material rod is taken out by the parison ta...

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Abstract

The invention provides a preparation method of a polyfluortetraethylene micro-porous film baseband, belonging to the chemical technical field, particularly relates to the processing technical field of micro-porous polyfluortetraethylene film. The invention comprises the processing steps that polyfluortetraethylene resin powder is mixed with solvent which is number 3 aviation kerosene and isoparaffin; the proportion for uniform mixing among the three ingredients of the polyfluortetraethylene, the number 3 aviation kerosene and the isoparaffin is 1: 0.1-0.15: 0.2-0.3 according to weight percentage; the mixture is statically arranged under the temperature environment of 40-65 DEG C, then dumped into a pre-pressing forming machine, uniformly and slowly pressed into polyfluortetraethylene material rods under the pressure of 50kg-180kg and sent to a thrust press; the mixture then sequentially enters all rollers with the temperature ranging from 30-180 DEG C; the uniformity and width of the thickness of the baseband are adjusted through a baseband uniformity automatic control system to generate the polyfluortetraethylene micro-porous film baseband which is coiled by a coiler. The finished product of the invention has high uniformity and improves the utilization ratio of finished product micro-porous film.

Description

Technical field: [0001] The invention relates to a preparation method of a polytetrafluoroethylene microporous film base belt, which belongs to the technical field of chemical industry, in particular to the processing technical field of microporous polytetrafluoroethylene films. Background technique: [0002] Microporous PTFE film is a kind of polymer material, which has the characteristics of high and low temperature resistance, acid and alkali resistance, and stable performance. It is commonly known as the king of plastics. Bacteria, filter dust and other functions, can be widely used in outdoor sports clothing, military and police uniforms, protective clothing, as well as air filtration, water purification, etc., and has developed rapidly in the international market. The production method of existing microporous polytetrafluoroethylene film is mainly the production technology of biaxially stretched polytetrafluoroethylene microporous membrane, as patent CN.1151350A has in...

Claims

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Application Information

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IPC IPC(8): B29C43/24B29C43/58B29C43/46B29C43/52B29B11/12C08L27/18C08K5/01B29L7/00
Inventor 江红
Owner 江西天润天和新材料科技有限公司
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