Preparing process for microporous teflon membran

A technology of polytetrafluoroethylene and its manufacturing method, which is applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in control, and achieve the effects of improving quality, reducing production cost, and lowering temperature

Inactive Publication Date: 2005-03-30
宁波登天氟材有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method of ultra-high temperature expansion and shaping is difficult to control in production practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Selection of raw materials: Polytetrafluoroethylene uses dispersed resin powder with a number average molecular weight of 10 million to 14 million, a particle size of 475 to 500 μm (ASTMD1457 test method), and a specific gravity of 2.15 to 2.16 (JIS-K6891 test method). The density is 500-540g / l (JIS-K6891 measurement method), the relative extrusion pressure is 2.0-2.3, the maximum decompression ratio is 300-500, the tensile strength is 39-40MPa, and the aromatic hydrocarbon isoparaffin is selected from ISIPAR H ~M, the initial boiling point is 179°C-223°C, the final boiling point is 187°C-254°C, the flash point is 53°C-92°C, the relative volatilization rate is less than 10%, the aniline point is 84°C-89°C, and the aromatic hydrocarbon content is less than 0.01 % by weight.

[0018] 2. Preparation of microporous membrane blank: After dehydrating and drying the qualified polytetrafluoroethylene, mix it with the required dearomatized hydrocarbon isoparaffin in a weight ...

Embodiment 2

[0030] Embodiment 2. Under the same conditions of raw material selection, raw material ratio, technological process and computer control, the effects of different ratios of polytetrafluoroethylene and dearomatized hydrocarbon isoparaffin L on product quality and yield were compared emphatically. The experimental results are shown in Table 1

[0031] PTFE: ISOPAR.L

[0032] The above results show that the optimum proportioning ratio of polytetrafluoroethylene dispersion type resin and dearomatized hydrocarbon isoparaffin L is 100: 25~30 weight, within this proportioning range, each process operation is all smooth, thereby the quality of product And the yield is relatively high.

Embodiment 3

[0033] Embodiment 3: Under the same situation of raw material selection, raw material ratio, technological process and computer control, focus on comparing different lubricants, at different temperatures, from the time of automatic volatilization in the same area of ​​broadband, the lubricant for comparison is commonly used The weight ratio of solvent oil (such as aviation kerosene) and ISOPAR.L (isoparaffin L) to PTFE powder resin is 25:100. The results are shown in Table 2.

[0034] Table 2 Comparison of lubricant volatilization time

[0035]

[0036] It can be seen from Table 2 that when the PTFE blank is made into a wide strip, it is much easier to remove it by using dearomatized isoparaffin lubricant than aviation kerosene, and the amount of dearomatized isoparaffin is also reduced by 20% compared with aviation kerosene. This is a very effective way to increase labor productivity for large-scale workshop production. Of course, it is also very beneficial to redu...

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Abstract

A microporous teflon film is prepared from the dispersed teflon resin and the arylhydrocarbon-removel isoparaffin in weight ratio of 100:(20-40) through heating to 100-200 deg.c for removing lubricating assistance, longitudinal stretching and transverse stretching under control of computer, and fixing shape at 250-400 deg.C. Its advantages are no harmful gas releasing in its production, high productivity, and high quality.

Description

technical field [0001] The invention relates to the improvement of the manufacturing method of polytetrafluoroethylene microporous membrane. Background technique [0002] The production method of polytetrafluoroethylene microporous membrane is complicated, the process is long, and there are many influencing factors. Therefore, there are many problems in mass production of high-quality products. Low molecular weight PTFE has low strength and small opening ratio for stretching. The high molecular weight polymer has good strength and high porosity. However, the perfluorinated linear high-molecular-weight polymer has large particles, high melting point, and high melt viscosity, and its microporous membrane manufacturing method is an unconventional process. Such as the selection of film-making raw materials, when high-molecular-weight PTFE is made into a billet, it is necessary to choose a suitable lubricating aid. After stirring with the high polymer, it can form a uniform past...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B29C55/02C08J5/18C08L27/18
Inventor 孙军廖新家
Owner 宁波登天氟材有限公司
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