PTFE composite material film and preparation method thereof

A composite film and film material technology, applied in the field of PTFE multi-layer film materials and its preparation, can solve the problems of low wear resistance and low strength of PTFE sealing materials, and achieve good wear resistance and good tensile strength Tensile strength and wide range of applications

Pending Publication Date: 2021-09-03
ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the intensity of the polytetrafluoroethylene sealing material that the technical scheme of this invention makes is low and wear resistance is lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The preparation method of the base film comprises the steps:

[0038] ① Mixing: Mix the PTFE dispersing resin and the extrusion aid, and then place it in a mixer to mix at a high speed, and the extrusion aid is kerosene;

[0039] ② Maturation: The raw materials obtained after the mixing treatment in step (1) are placed in an oven for maturation treatment, the maturation temperature is 40~50°C, and the maturation time is 8~12h;

[0040] ③ Screening: the ripening raw material obtained by step ② is subjected to sieving treatment to screen out the agglomeration produced by the ripening;

[0041] ④ Press blank: After sieving, the curing raw material of PTFE dispersion resin is placed in a press blank machine for pre-pressing to obtain a blank, and the pressing speed is 0.05~0.1m / min;

[0042] ⑤ Calendering: use a calender to calender the blank described in step ④ to obtain a base tape, and the temperature of the pressing roller is set to 35~45°C;

[0043] ⑥ Degreasing: hea...

Embodiment 1

[0047]The PTFE composite membrane includes one layer of filling membrane and two layers of matrix membranes arranged at intervals, and the filling membrane is arranged between the two layers of matrix membranes. The filling membrane is a polyurethane (Polyurethane, PU) membrane with a thickness of 20 μm; the base membrane has a pore size of 3 μm and a thickness of 30 μm. The filling film and the matrix film are arranged at intervals, and after the composite is obtained, hot pressing is performed once. The hot pressing temperature is 190 °C, the pressure is constant at 0.2-0.4 MPa, and the speed is 8 m / min. The thickness of the prepared PTFE composite membrane was 75 μm. The tensile strength test and wear resistance test were carried out respectively, and the tensile strength of the PTFE composite membrane was 4.7 N / mm²; the mass loss rate was 9.2%.

Embodiment 2

[0049] The PTFE composite membrane includes 2 layers of filling membranes and 3 layers of base membranes arranged at intervals. The filling membrane material is a polyurethane membrane with a thickness of 20 μm; the base membrane has a pore size of 3 μm and a thickness of 30 μm. The base film 1, the filling film 1, and the base film 2 are arranged at intervals in sequence to obtain the composite 1 and then hot-pressed once; the refilling film 2 is arranged on one side of the composite 1, and the base film 3 is arranged on the filling film 2 The side away from the composite 1 is obtained to obtain the composite 2, and then subjected to hot-pressing treatment to obtain a PTFE composite membrane. Among them, the hot-pressing temperature is 190 °C, the pressure is constant at 0.2-0.4 MPa, and the speed is 8 m / min. The thickness of the prepared PTFE composite membrane is 100 μm. The tensile strength test and wear resistance test were carried out respectively, and the tensile stre...

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Abstract

The invention discloses a PTFE composite material film and a preparation method thereof. The PTFE composite material film is formed by compounding a plurality of matrix films and a filling film which are arranged at intervals. The filling film is arranged on the middle layer, and the matrix films are arranged on the two faces of the filling film. The matrix film is made of a two-way stretching PTFE film material, the filling film is made of a thermoplastic polymer film material, the transverse stretching multiple of the two-way stretching PTFE film is 11-12 times, and the longitudinal stretching multiple of the two-way stretching PTFE film is 5-7 times. The preparation method of the PTFE composite material film comprises the following steps: arranging the filling film and the matrix films at an interval to obtain a complex; and then carrying out hot pressing treatment on the complex at the hot pressing temperature of 100-280 DEG C, the constant pressure of 0.2-0.4 MPa and the speed of 5-10m/min to obtain the PTFE composite material film. The PTFE composite material film disclosed by the invention has the advantages of high interlayer bonding strength, difficulty in layering, high tensile strength and high wear resistance.

Description

technical field [0001] The invention relates to the technical field of preparation of polytetrafluoroethylene membrane materials, in particular to a PTFE multilayer membrane material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) membrane material has strong high and low temperature resistance, hydrophobicity, non-stickiness, self-lubrication, corrosion resistance and friction resistance, and is widely used in clothing, medical, electronics and other fields, including clothing Membranes, bubble point membranes and filter media, etc. [0003] However, because PTFE has a symmetrical molecular chain structure and the band-shaped crystal is easily peeled off by flakes, it has shortcomings such as easy wear, large linear collision coefficient, poor creep resistance, and low bearing capacity, which largely limit its application. . Therefore, how to increase the tensile strength and wear resistance of the PTFE membrane material is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/24B29C43/34B29C43/52B29C55/02
CPCB29C43/24B29C43/245B29C43/34B29C43/52B29C55/02
Inventor 王峰王慧盟
Owner ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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