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Preparation method for multifunctional PTFE composite film

A PTFE and composite membrane technology, which is applied in the field of preparation of multifunctional PTFE composite membranes, can solve the problems of polytetrafluoroethylene membranes being unable to filter particulate matter, poor water penetration resistance and strength, and achieve strong water penetration resistance and filtration high efficiency effect

Active Publication Date: 2013-09-04
浙江国泰萧星密封材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for preparing a multifunctional PTFE composite membrane, which mainly solves the problems in the prior art that the prepared polytetrafluoroethylene membrane cannot filter relatively small particulate matter, and has poor water penetration resistance and strength, etc. technical issues

Method used

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  • Preparation method for multifunctional PTFE composite film
  • Preparation method for multifunctional PTFE composite film
  • Preparation method for multifunctional PTFE composite film

Examples

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Effect test

Embodiment 1

[0027] Embodiment 1: the preparation method of a kind of multifunctional PTFE composite membrane of this example, its steps are:

[0028] a. Mixing materials to make embryos: Mix solvent oil with a mass fraction of 25% and polytetrafluoroethylene resin powder evenly, place in a 50-60°C oven for aging for about 12 hours, and pre-press into a columnar blank;

[0029] b. Base tape molding: Put the columnar blank into the extruder, and prepare a base tape with a width of 200mm and a thickness of 0.15mm through extrusion, calendering and drying. The extrusion compression ratio is 50-80, and the diameter of the extruded strip is 14mm left and right, and placed in warm water for insulation;

[0030] c. Stretching to form a film: first prepare a base film through longitudinal stretching, and then stretch it on a transverse stretching machine to form a high-strength and self-adhesive PTFE biaxially stretched microporous film 3 with a width of 1-3m. The stretch ratio is 3-15 times, ...

Embodiment 2

[0032] Embodiment 2: the preparation method of a kind of multifunctional PTFE composite membrane of this example, after obtaining single-layer composite membrane structure in step d, then coat one deck fluororesin suspension emulsion on the reverse side again, after fixed sintering treatment, its fixed sintering Processing step is identical with embodiment 1, and all the other steps are with embodiment 1, finally get as follows Figure 4 The finished multifunctional PTFE composite membrane is shown.

Embodiment 3

[0033] Embodiment 3: the preparation method of a kind of multifunctional PTFE composite membrane of this example, the product that step d produces comprises the PTFE membrane 110 of bulky porous structure and the sintered microporous layer of two layers of different structures, and its structure is that ePTFE is matrix For material 110, a layer of PTFE powder microporous structure layer 120 is sintered on 110, and then a layer of fluororesin suspension emulsion 130 is coated on the surface of 120. The membrane material of this composite structure is also a very efficient filter material.

[0034] In this example, the calcination temperature of the first layer is 330-400°C, and the calcination time is 10s. After the first layer of calcination, a layer of fluororesin suspoemulsion containing glass fibers and a particle size of 0.05-0.8 μm is applied. , and then sintered on one side, the second sintering temperature is 350°C, the sintering time is about 10s, and the heat source fo...

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Abstract

The invention relates to a preparation method for PTFE, and particularly relates to a preparation method for a multifunctional PTFE composite film. The preparation method mainly solves the technical problems that a polytetrafluoroethylene film prepared by a conventional technology can not filter small particles and has poor resistance to water permeability and poor strength. The preparation method comprises the steps of preparing a blank by mixing materials; base-band shaping; stretching to form a film; then conveying the surface of the prepared PTFE biaxial stretching microporous film to an expansion roller; coating a fluorine resin suspended emulsion on the surface of the PTFE biaxial stretching microporous film by a spraying device; sending the surface of the PTFE biaxial stretching microporous film to an infrared or hot wind heating device by a roller cloth clamper to carry out drying and high temperature rapid calcinations, so as to make the fluorine resin coated on the surface melt; and finally winding into the film by a winding roller to obtain the multifunctional PTFE composite film.

Description

technical field [0001] The invention relates to a preparation method of PTFE, in particular to a preparation method of a multifunctional PTFE composite membrane. Background technique [0002] PTFE biaxially stretched membrane is widely used in filtration, moisture permeability and heat preservation due to its excellent porosity. It is a high-performance and high-tech membrane material. Chinese patent discloses a production process of polytetrafluoroethylene film (publication number: CN 102358046 A), which includes the following steps: mixing, billet making, extrusion, calendering, longitudinal stretching, transverse stretching and shaping, calendering The steps include initial pressing and finishing pressing in turn. The initial pressing needs to press the bar formed in the extrusion step 2 to 5 times to form a preliminary pressing blank film, and finishing pressing is to perform a calendering on the preliminary pressing blank film after the initial pressing Forming a fine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D67/00
Inventor 孙李超
Owner 浙江国泰萧星密封材料股份有限公司
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