Preparation method of single-component vulcanized electric conduction silica gel

Abstract

The invention relates to the technical field of electromagnetic shielding materials, in particular to a preparation method of single-component vulcanized electric conduction silica gel. The preparation method comprises the steps of electric conduction filling, stirring and dispersing, dilution spraying and vulcanization shaping. A spray chamber adopted in dilution spraying comprises a shell, a substrate case and a spray head. Struts are arranged below the substrate case and enable the substrate case to be inclined by an angle. Due to the fact that in the spray forming process, the uniform thickness of electric conduction silica gel liquid attached to the substrate case cannot be controlled, areas with insufficient standing forming and vulcanization degrees exist on electric conduction silica gel, stability of the overall performance of the electric conduction silica gel is destroyed, and the use effect of the electric conduction silica gel is reduced, the inclined substrate case is arranged in the spray chamber, a through groove at one end of the substrate case is used in cooperation, much electric conduction silica gel liquid sprayed to the substrate case flows out under the gravity action, then the uniform thickness of an electric conduction silica gel coating is kept, and therefore the preparation effect of the single-component vulcanized electric conduction silica gel is improved.

Description

technical field [0001] The invention relates to the technical field of conductive shielding materials, in particular to a preparation method of single-component vulcanized conductive silica gel. Background technique [0002] With the continuous development of science and technology, flexible electronic products have begun to appear in our lives. Since flexible products require materials to be lightweight and portable, conductive films have become common flexible conductive materials in products. They have good conductivity and can Realize some specific electronic functions, among which conductive rubber has a wide range of elastic deformation ability, which is more suitable as a thin film material for the preparation of flexible electronic devices; conductive silica gel is to uniformly distribute conductive particles such as silver-coated copper powder and nickel-coated graphite powder on silica gel Among them, the conductive particles are connected to each other to achieve ...

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Problems solved by technology

[0003] The conductivity of the conductive silicone rubber film is due to the conductive filler dispersed in the rubber to form a conductive network. The experiments in the references have proved that the dispersion of the filler in the liquid conductive rubber only requires sufficient mechanical stirring to achieve its excellent dispersion and conductivity. Performance; In the spraying of conductive rubber, it is difficult to control the stable thickness of the conductive silicone coating on the substrate, which will cause different treatment degrees for the subsequent shaping and vulcanization of conductive silicone, which will affect the final quality of conductive silicone

[0004] There are also some technical solutions about the preparation method of single-component vulcanized conductive silica gel in the prior art. For example, a Chinese patent with application number 2016105441226 discloses a single-component room temperature vulcanized conductive silica gel and its preparation method, which consists of the following weight Ratio of raw materials prepared: silicone rubber base rubber: crosslinking agent: conductive filler and treatment agent: filler = 100: 10 ~ 20: 300 ~ 450: 2 ~ 3; wherein, the weight ratio of conductive filler to treatment agent is 100 : 1~2; the silicone rubber base is a combination of hydroxyl silicone oil and MQ resin, the conductive filler is a combination of silver-plated copper powder, silver powder and nickel-plated graphite, etc., and the crosslinking agent is ethylaminomethylethoxysilane or A combination of chloromethylethoxy silanes; the invention also discloses the preparation method of the one-component room temperature vulcanized conductive silica gel; the conductive silica gel in the technical solution has good conductivity and shielding performance, moderate hardness of 40-50 degrees, and aging resistance Good resistance (-70 to 200°C), good mechanical strength, easy to use, closely adhere to the contact surface when used for electronic connection devices, high bonding strength, elastic, and can perform sealing and shock absorption while conducting and shielding Function; it is suitable for conductive shielding bonding in the field of mobile phone communication; however, the size of the conductive silica gel in this technical solution is difficult to control when it is cured and shaped, which makes the performance of the prepared conductive silica gel not stable enough, which affects the application effect of the conductive silica gel

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