Preparation method of high-filler-filling-amount polytetrafluoroethylene composite film material

The technology of polytetrafluoroethylene and filling amount is applied in the field of preparation methods, and can solve the problems of high equipment requirements, complex process, low filling amount of fillers, etc., and achieve the effects of low cost, simple tooling equipment, and simple operation process.

Active Publication Date: 2018-12-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the disadvantages of the current turning method to prepare inorganic filler / polytetrafluoroethylene composite membrane materials with low filler filling and difficult to meet the modification requirements, and the casting method to prepare composite membrane materials requires high equipment requirements and complicated processes, the purpose of the present invention is to propose a A polytetrafluoroethylene composite membrane material with high filling content of inorganic filler, controllable dispersion form of inorganic filler and composite membrane structure, adjustable function, simple equipment process, excellent mechanical properties, and industrialization preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of silicon dioxide / polytetrafluoroethylene composite membrane material (i.e. SiO 2 / PTFE composite membrane material) raw materials include the following components and parts by weight:

[0039] Component Parts by weight Median particle size (μm)

[0040] Silica 50 10

[0041] PTFE 50 30

[0042] The first step is to prepare materials according to the above components and mix them evenly with a high-speed mixer, and then sieve;

[0043] In the second step, the mixture is placed in a cylindrical mold with a mandrel, and the mixture is pressed up and down on the hydraulic press by means of step-by-step pressurization and slow pressure relief. The pressing pressure is 10~15MPa. The blank is placed in the oven for more than 24 hours to eliminate internal stress;

[0044] The third step is to put the blank obtained in the second step into a programmable temperature-controlled oven for free sintering at a temperature of 360-390 ° C, and obtain a sintered parison af...

Embodiment 2

[0065] A kind of titanium dioxide / polytetrafluoroethylene composite film material (i.e. TiO 2 / PTFE composite membrane material) raw materials include the following components and parts by weight:

[0066] Component Parts by weight Median particle size (μm)

[0067] Titanium dioxide 40 12

[0068] PTFE 60 40

[0069] The first step is to prepare materials according to the above components and mix them evenly with a high-speed mixer, and then sieve;

[0070] In the second step, the mixture is placed in a cylindrical mold with a mandrel, and the mixture is pressed up and down on the hydraulic press by means of step-by-step pressurization and slow pressure relief. The pressing pressure is 10~15MPa. The blank is placed in the oven for more than 24 hours to eliminate internal stress;

[0071] The third step is to put the blank obtained in the second step into a programmable temperature-controlled oven for free sintering at a temperature of 360-390 ° C, and obtain a sintered par...

Embodiment 3

[0092] A glass fiber / polytetrafluoroethylene composite membrane material (i.e. GF / PTFE composite membrane material) comprises the following components and parts by weight:

[0093] Component Parts by weight Median particle size / average length (μm)

[0094] Fiberglass 35 15

[0095] PTFE 65 50

[0096] The first step is to prepare materials according to the above components and mix them evenly with a high-speed mixer, and then sieve;

[0097] In the second step, the mixture is placed in a cylindrical mold with a mandrel, and the mixture is pressed up and down on the hydraulic press by means of step-by-step pressurization and slow pressure relief. The pressing pressure is 10~15MPa. The blank is placed in the oven for more than 24 hours to eliminate internal stress;

[0098] The third step is to put the blank obtained in the second step into a programmable temperature-controlled oven for free sintering at a temperature of 360-390 ° C, and obtain a sintered parison after coolin...

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Abstract

The invention provides a preparation method of a high-filler-filling-amount polytetrafluoroethylene composite film material. According to the main content of the preparation method, by means of high-speed mixing, cold pressing blank formation, sintering formation, turning film formation and calendaring aftertreatment, the polytetrafluoroethylene composite film material with the filling amount of inorganic filler as high as 20wt% or over is prepared; and besides, through design of the dispersion states of multiple kinds of inorganic filler with different functions and adjustment of the preparation technology, the inorganic filler / polytetrafluoroethylene composite film material which is controllable in film structure and excellent in mechanical performance, electrical conductivity, heat conductivity and wear resistance can be prepared. The high-filler-filling-amount polytetrafluoroethylene composite film material has the advantages of being controllable in film structure, excellent in mechanical performance, flexible and adjustable in functionality, simple in preparation technology and equipment and suitable for industrialization. The high-filler-filling-amount polytetrafluoroethylene composite film material has remarkable research value and application prospect in the field of high-performance high-functionality PTFE composite film materials.

Description

technical field [0001] The invention relates to a method for preparing a polytetrafluoroethylene composite membrane material with a high filling content of fillers, and more specifically relates to a polytetrafluoroethylene composite membrane material with a filling content of inorganic fillers up to 20wt%, controllable dispersion form of inorganic fillers, controllable composite membrane structure, and controllable functions. The invention relates to a preparation method of a polytetrafluoroethylene composite membrane material with high filler filling capacity, simple adjustment and equipment process, excellent mechanical properties, and industrialization, and belongs to the technical field of high-performance polytetrafluoroethylene composite membrane materials. Background technique [0002] Polytetrafluoroethylene (PTFE), as a special engineering plastic, has been known as the "King of Plastics" since the American scientist R.S.Plunkett discovered PTFE in the process of st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01
CPCB29D7/01
Inventor 郭少云张瑶陈蓉
Owner SICHUAN UNIV
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