Short carbon fiber based electromagnetic shielding composite material and preparation method thereof
A chopped carbon fiber, electromagnetic shielding technology, applied in the field of chopped carbon fiber electromagnetic shielding composite material and its preparation, can solve the problems of easy corrosion, poor absorbing performance, high price, etc., achieve good electrical conductivity and electromagnetic shielding performance, improve Combined performance, adjustable effect of shielding performance
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[0030] Example one
[0031] Such as figure 1 Shown. A chopped carbon fiber electromagnetic shielding composite material. The chopped carbon fiber electromagnetic shielding composite material 3 has a three-layer structure, including two insulating resin layers 1 on the outside, and a chopped carbon fiber shield sandwiched between the two insulating resin layers 1. Felt 2.
[0032] The material of the insulating resin layer 1 is PE or PC film.
[0033] The insulating resin layer 1 and the chopped carbon fiber shielding felt layer 2 are formed as a whole by hot pressing, and the carbon fibers in the chopped carbon fiber shielding felt layer 2 are lapped by hot pressing to form a three-dimensional conductive network.
Example Embodiment
[0034] Example two
[0035] A preparation method of chopped carbon fiber electromagnetic shielding composite material includes the steps:
[0036] (1) Put a certain proportion of chopped ES fiber 4 and chopped carbon fiber 5 into a 1.2% hydroxyethyl cellulose solution to disperse and mix, and stir at the speed of a mixer, and then stand still. ES fiber 4 is polyethylene / polypropylene fiber with a skin-core structure, the skin layer is polyethylene, and the core layer is polypropylene; the mass ratio of chopped carbon fiber 5 to chopped ES fiber 4 is 2:3, and the fiber length is 6mm , The mixer has a stirring speed of 700rpm, a stirring time of 4min, and a standing time of 5min.
[0037] (2) Pour the dispersed solution into a paper machine with a capacity of more than 10L, and make it through the 80-mesh copper net on the paper machine, and then put the made chopped carbon fiber shielding felt layer 2 into a constant temperature drying oven Medium-dried, paper-made chopped carbon fi...
Example Embodiment
[0041] Example three
[0042] A preparation method of chopped carbon fiber electromagnetic shielding composite material includes the steps:
[0043] (1) Put a certain proportion of chopped ES fiber 4 and chopped carbon fiber 5 into a hydroxyethyl cellulose solution with a mass fraction of 1.5% to disperse and mix, and stir at the speed of a mixer, and then stand still. ES fiber 4 is polyethylene / polypropylene fiber with a skin-core structure, the skin layer is polyethylene, and the core layer is polypropylene; the mass ratio of the chopped carbon fiber 5 to the chopped ES fiber 4 is 3:7, and the fiber length is 6mm , The stirring speed of the mixer is 600rpm, the stirring time is 5min, and the standing time is 5min.
[0044] (2) Pour the dispersed solution into a paper machine with a capacity of more than 10L, and make it through the 80-mesh copper net on the paper machine, and then put the made chopped carbon fiber shielding felt layer 2 into a constant temperature drying oven Med...
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