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Polytetrafluoroethylene composite material as well as preparation method and application thereof

A technology of polytetrafluoroethylene and composite materials, applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of reduced machinability, poor adhesion of copper foil, and low product qualification rate, etc. problems, to achieve the effect of improving thermal expansion coefficient, good adhesion, and high product qualification rate

Active Publication Date: 2021-05-18
SHANGHAI RES INST OF MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Highly filled ceramic powder and fiber powder act as physical crosslinking points in the fluororesin phase, effectively improving the thermal expansion coefficient of the filled dielectric material. However, during the calendering process, fluororesin molecules and fiber powder will inevitably The calendering direction produces orientation alignment, resulting in a final product with a greater coefficient of thermal expansion in the Z-axis direction than in the X and Y-axis directions
On the other hand, this method still has the problem of poor adhesion to copper foil
In addition, when PTFE resin is filled with a large amount of ceramic powder filler, its processability will be reduced, especially during sintering, it is easy to produce crack defects, resulting in a very low product qualification rate

Method used

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  • Polytetrafluoroethylene composite material as well as preparation method and application thereof
  • Polytetrafluoroethylene composite material as well as preparation method and application thereof
  • Polytetrafluoroethylene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First adopt the following steps to prepare fluorinated graphene with oxygen-containing groups:

[0047] Weigh 80ml of concentrated sulfuric acid, then add 1g of fluorinated graphite powder (25wt% fluorine content), ice bath and magnetically stir for 3h, then slowly add 9g of potassium permanganate, and continue magnetically stirring for 2h to obtain a mixed solution;

[0048] Put the above mixed solution in a constant temperature water bath at 38°C for 2 hours to obtain a mixed solution of graphite fluoride oxide;

[0049] Add 50ml of deionized water dropwise to the above-mentioned oxidized graphite fluoride mixed solution, then add 30ml of hydrogen peroxide with a mass fraction of 30% to remove excess potassium permanganate, then add 800ml of deionized water, let stand for stratification, and then The upper layer product is washed at a centrifugal speed of 1000-10000 r / min until the pH value of the solution is 7, and fluorinated graphene with oxygen-containing groups i...

Embodiment 2

[0057] First adopt the following steps to prepare fluorinated graphene with oxygen-containing groups:

[0058] Weigh 80ml of concentrated sulfuric acid, then add 1g of fluorinated graphite powder (40wt% fluorine content), ice bath and magnetically stir for 3h, then slowly add 12g of potassium permanganate, and continue magnetically stirring for 2h to obtain a mixed solution;

[0059] Put the above mixed solution in a constant temperature water bath at 38°C for 2 hours to obtain a mixed solution of graphite fluoride oxide;

[0060] Add 50ml of deionized water dropwise to the above-mentioned oxidized graphite fluoride mixed solution, then add 30ml of hydrogen peroxide with a mass fraction of 30% to remove excess potassium permanganate, then add 800ml of deionized water, let stand for stratification, and then The upper layer product is washed at a centrifugal speed of 1000-10000 r / min until the pH value of the solution is 7, and fluorinated graphene with oxygen-containing groups ...

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Abstract

The invention relates to a polytetrafluoroethylene composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing polytetrafluoroethylene dispersion emulsion with fluorinated graphene with oxygen-containing groups to obtain a mixture; pretreating an inorganic filler with a coupling agent to obtain a modified inorganic filler coated with reactive groups on the surface; fully and uniformly mixing the mixture with the modified inorganic filler to obtain a resin glue solution; and adding a demulsifier into the resin glue solution for demulsification, filtering out solids, and drying to obtain the polytetrafluoroethylene composite material. A copper-clad plate is obtained by covering copper foils on the upper surface and the lower surface of a sheet prepared by calendering the polytetrafluoroethylene composite material and carrying out hot pressed sintering in a hot press. Compared with the prior art, the polytetrafluoroethylene composite material and the copper-clad plate prepared from the polytetrafluoroethylene composite material have the advantages of being excellent in dielectric property, good in binding power with copper foil, free of product cracks, high in qualified rate and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a polytetrafluoroethylene composite material and a preparation method and application thereof. Background technique [0002] With the revolution of modern information technology, digital circuits have gradually entered the stage of high-speed information processing and high-frequency signal transmission. In order to process increasing data, the frequency of electronic equipment has become higher and higher. For this reason, on the basis of meeting the traditional design and manufacturing requirements, newer requirements are put forward for the performance of high-frequency circuit substrate materials, especially in the millimeter wave field. The development and application of ether, hydrocarbon resin and polytetrafluoroethylene (PTFE) substrates have aroused great concern in the market. In particular, polytetrafluoroethylene has become the first choice fo...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K9/02C08K9/10C08K3/04B32B15/085B32B15/20B32B27/18B32B27/32
CPCC08K9/02C08K9/10C08K3/042B32B15/20B32B15/085B32B27/322B32B27/18B32B2307/204B32B2307/734C08L27/18
Inventor 聂婭李小慧金石磊段家真莫晓羚
Owner SHANGHAI RES INST OF MATERIAL