Varnished cloth, preparation method thereof, copper-clad plate containing varnished cloth and application of varnished cloth

A technology of copper clad laminate and varnished cloth, applied in the field of flexible copper clad laminate and application, varnished cloth and its preparation, can solve the problems of high operating temperature and high melting point, and achieve good dielectric properties, good adhesion properties and excellent low temperature processability. Effect

Active Publication Date: 2020-05-19
GUANGDONG SHENGYI SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN107385936A discloses a method for preparing PTFE lacquer cloth, PTFE varnish cloth prepared by the method and a metal-clad laminate. This patent application obtains a dipped glass fiber cloth by dipping glass fiber cloth once and then sintering it; The horizontal coating machine coats PTFE glue solution on one side of the obtained primary impregnated glass fiber cloth, dries and sinters to obtain a PTFE cloth coated with glue on one side; the other side of the obtained PTFE cloth is coated with a horizontal coating machine PTFE glue, drying and sintering, to obtain PTFE varnished cloth coated with glue on both sides; the PTFE coated on the surface of this patent has disadvantages such as high melting point and high operating temperature, and it needs to be pressed for a long time with a high-temperature transmission machine to have a bonding force with the copper foil
Although the patent reduces the operating temperature, it still needs multiple dipping or lamination of multiple layers to press together to obtain the required thickness of the plate

Method used

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  • Varnished cloth, preparation method thereof, copper-clad plate containing varnished cloth and application of varnished cloth
  • Varnished cloth, preparation method thereof, copper-clad plate containing varnished cloth and application of varnished cloth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of oilcloth, preparation method is as follows:

[0050] (1) Use polyimide fiber woven cloth to impregnate in PTFE emulsion, control the thickness of PTFE slurry by adjusting the gap between the nip rollers, then dry in an oven at 130°C for 8 minutes to remove the solvent, and sinter in an oven at 320°C , the time is 15 min, and finally a PTFE adhesive sheet with a thickness of 40 μm is obtained.

[0051] (2) Coat both sides of the bonding sheet with 17.5 μm (dry thickness) PFA emulsion, then dry in an oven at 160°C for 8 minutes to remove the solvent, and sinter in an oven at 370°C for 8 minutes to obtain a varnish with a thickness of 75 μm .

Embodiment 2

[0053] A kind of oilcloth, preparation method is as follows:

[0054] (1) Use liquid crystal polymer (LCP) fiber non-woven fabrics to impregnate in PTFE emulsion, control the thickness of the PTFE slurry by adjusting the gap between the nip rollers, then dry in a 130°C oven for 8min to remove the solvent, and then dry it in a 320°C oven The sintering was carried out for 15 minutes, and finally a PTFE bonded sheet with a thickness of 75 μm was obtained.

[0055] (2) Coat both sides of the adhesive sheet with 12.5 μm (dry thickness) PFA emulsion, then dry in an oven at 160°C for 8 minutes to remove the solvent, and sinter in an oven at 370°C for 8 minutes to obtain a varnished cloth with a thickness of 100 μm .

Embodiment 3

[0057] A kind of oilcloth, preparation method is as follows:

[0058] (1) Use aramid fiber non-woven fabric to impregnate in PTFE emulsion, control the thickness of the PTFE slurry by adjusting the gap between the nip rollers, then dry in an oven at 140°C for 5 minutes to remove the solvent, and sinter in an oven at 310°C, The time is 25 minutes, and finally a PTFE adhesive sheet with a thickness of 95 μm is obtained.

[0059] (2) Coat both sides of the bonding sheet with 27.5 μm (dry thickness) PFA emulsion, then dry in a 170°C oven for 10 minutes to remove the solvent, and sinter in a 360°C oven for 15 minutes to obtain a varnished cloth with a thickness of 150 μm .

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Abstract

The invention provides varnished cloth, a preparation method of the varnished cloth, a copper-clad plate comprising the varnished cloth and application. The varnished cloth comprises a PTFE bonding sheet and PFA adhesive film layers covering the two sides of the PTFE bonding sheet; wherein the components of the PTFE bonding sheet comprise an organic reinforcing material. The varnished cloth provided by the invention has excellent dielectric properties and good folding resistance, and is beneficial to being applied to flexible copper-clad plates. The preparation method provided by the inventioncan be used for continuous roll-shaped rolling production, the production process is simple and feasible, the preparation of the varnished cloth can be realized only by one-time dipping and one-timecoating, and meanwhile, the subsequent copper foil coating process can be formed by rolling, so that the process cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of copper-clad laminates, and relates to a varnish cloth and a preparation method thereof, a copper-clad laminate containing the same and applications thereof, in particular to a varnish cloth and a preparation method thereof, a flexible copper-clad laminate containing the same and applications thereof. Background technique [0002] With the high integration of social informatization, the speed of information processing and the amount of data processing capacity have also increased significantly, and mobile communications such as mobile communications and automotive communications used in gigabit-level high-frequency fields are becoming more and more widespread. As the cornerstone of the electronic circuit industry - copper clad laminates are widely used in communication base stations, satellites, mobile phones, computers and future millimeter wave radar fields. [0003] As a high-frequency and high-speed co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/21C09J127/18B32B15/20B32B15/14B32B5/02B32B27/04B32B27/32B32B7/08B32B7/12B32B33/00B32B37/10B32B37/12H05K1/03
CPCC09J7/21C09J127/18B32B15/20B32B15/14B32B7/08B32B7/12B32B33/00B32B37/10B32B37/12H05K1/0366B32B2260/021B32B2260/046B32B2307/204B32B2457/08C09J2400/263C09J2427/00
Inventor 付志强黎巧玲茹敬宏
Owner GUANGDONG SHENGYI SCI TECH
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