Preparation method of waterproof polytetrafluoroethylene thin film

A polytetrafluoroethylene film technology, which is applied in the field of waterproof polytetrafluoroethylene film preparation, can solve the problems of uneven air permeability and uneven thickness of the film, and achieve the effects of shortening heating time, reducing processing procedures, and preventing deformation

Active Publication Date: 2016-07-13
佛山市顺德区众明环保包装薄膜有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polytetrafluoroethylene film that existing processing technique makes, for example the polytetrafluoroethylene microporous membrane that the patent No. ZL02108850.0 discloses makes of a kind of polytetrafluoroethylene microporous membrane processing method, but has following shortcoming: The uneven thickness of the film causes uneven air permeability of the film

Method used

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  • Preparation method of waterproof polytetrafluoroethylene thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preparation method of waterproof polytetrafluoroethylene film, comprises the following steps successively:

[0035] (1) Mixing: Stir and mix polytetrafluoroethylene resin powder, liquid paraffin, and nano-silica powder with a mass ratio of 1:0.2:0.15, and let stand at 30°C for 12 hours to form polytetrafluoroethylene Material; wherein the polytetrafluoroethylene resin powder has a crystallinity of 97% and a molecular weight of 10,000. The preparation method of nano-silica powder is as follows: put nano-silica powder, ethanol, toluene, and silane coupling agent in a closed container at 50°C in a mass ratio of 1:4:0.5:0.3, and stir for 10 hours to obtain a suspension The turbid liquid was suction-filtered and dried to obtain a nano-silica hydrophobic material.

[0036] (2) Compacting and calendering: the polytetrafluoroethylene material is pressed into a cylindrical blank through a compacting machine at 30°C, and the blank is extruded into a rod at a temperatur...

Embodiment 2

[0040] A kind of preparation method of waterproof polytetrafluoroethylene film, comprises the following steps successively:

[0041] (1) Mixing: Stir and mix polytetrafluoroethylene resin powder, petroleum ether, and nano-silica powder with a mass ratio of 1:0.25:0.17, and let stand at 50°C for 18 hours to form polytetrafluoroethylene Material; wherein the polytetrafluoroethylene resin powder has a crystallinity of 98% and a molecular weight of 100,000. The preparation method of nano-silica powder is as follows: put nano-silica powder, ethanol, toluene, and silane coupling agent in a closed container at 30°C in a mass ratio of 1:2:0.2:0.1, stir for 8 hours, and obtain a suspension The turbid liquid was suction-filtered and dried to obtain a nano-silica hydrophobic material.

[0042] (2) Compacting and calendering: The polytetrafluoroethylene material is pressed into a cylindrical blank through a compacting machine at 40°C, and the blank is extruded into a rod at a temperature...

Embodiment 3

[0046] (1) Mixing: Stir and mix polytetrafluoroethylene resin powder, kerosene, and nano-silica powder with a mass ratio of 1:0.3:0.18, and let stand at 70°C for 24 hours to form a polytetrafluoroethylene material ; Among them, the crystallinity of the polytetrafluoroethylene resin powder is 99%, and the molecular weight is 1 million. The preparation method of nano-silica powder is as follows: put nano-silica powder, ethanol, toluene, and silane coupling agent in a closed container at 40°C in a mass ratio of 1:3:0.4:0.2, and stir for 10 hours to obtain a suspension The turbid liquid was suction-filtered and dried to obtain a nano-silica hydrophobic material.

[0047] (2) Compacting and calendering: the polytetrafluoroethylene material is pressed into a cylindrical blank through a compacting machine at 50°C, and the blank is extruded into a rod at a temperature of 60°C through a pusher, and then Calendered at 80°C by a calender to form a polytetrafluoroethylene base tape;

[...

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Abstract

The invention relates to the field of thin film, in particular to waterproof polytetrafluoroethylene thin film. A preparation method of the waterproof polytetrafluoroethylene thin film comprises the following steps of 1, mixing, wherein polytetrafluoroethylene resin powder, a liquid lubricant and a hydrophobic material are stirred and mixed; 2, blank pressing and calendering, wherein polytetrafluoroethylene materials are subjected to blank pressing and calendering to be prepared into a polytetrafluoroethylene base band; 3, longitudinal drawing and steam treatment, wherein polytetrafluoroethylene is subjected to longitudinal drawing and steaming through steam to obtain a degreased base band; 4, transverse drawing and heat setting, the degreased base band is subjected to transverse drawing on an expander, sintering heat setting is conducted, and the heat-setting thin film is obtained. The obtained polytetrafluoroethylene thin film has the advantages of being good in waterproof effect and uniform in thickness.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a preparation method of a waterproof polytetrafluoroethylene film. Background technique [0002] The polytetrafluoroethylene dispersed resin is extruded and deoiled by paste extrusion, and then stretched in one or two directions to obtain a microporous polytetrafluoroethylene material with micropores. Due to its special properties, the material becomes A fluorine-containing functional material for high-end applications, such as environmental filter materials, clothing fabrics, artificial organ materials, electronic materials, and sealing and insulating materials. PTFE microporous membrane has been used to manufacture wire and cable insulation materials, artificial blood vessels, sealing tapes, environmental protection filtration and Clothing fabrics, etc. The currently manufactured PTFE microporous membrane has a large pore size, and its water pressure resistance or filtering eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01B29K27/18
CPCB29D7/01B29K2027/18B29K2995/0093
Inventor 苏颖颖沈忠心嵇叶红
Owner 佛山市顺德区众明环保包装薄膜有限公司
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