Single-component extrusion molding conductive rubber for electromagnetic shielding and preparation method of single-component extrusion molding conductive rubber

Abstract

The invention discloses a single-component extrusion molding conductive rubber for electromagnetic shielding and a preparation method of the single-component extrusion molding conductive rubber, belonging to the technical field of electromagnetic shielding materials. The single-component extrusion molding conductive rubber is composed of dendritic silver coated copper powder, silvered glass fiber, polydimethylsiloxane containing vinyl by rubber base body, reinforcing agent gaseous phase white carbon black, alkynol inhibitor, metal platinum catalyst, and cross-linking agent methylhydropolyorganosiloxane. The preparation method comprises the following steps: pretreatment is carried out to the dendritic silver coated copper powder and the silvered glass fiber through amido coupling agent methyl organodisilane according to the formula, the rubber base body and the gaseous phase white carbon black are added in a vacuum kneading machine, are mixed uniformly and are added in a double-planet mixing plant, and then the alkynol inhibitor, the metal platinum catalyst and the treated electric conduction powder are mixed uniformly to form a component 1; the treated electric conduction powder is added in a cross-linking agent and is mixed uniformly to form a component 2; and two components in the double planets are mixed to form the single-component on-site forming electromagnetic shieldingsilicon rubber. The rubber has good shielding performance and good mechanical property.

Description

technical field [0001] The invention relates to a single-component conductive rubber material for electromagnetic shielding used for packaging electronic circuit system shells and a preparation method thereof, belonging to the technical field of electromagnetic shielding materials. Background technique [0002] With the rapid development of modern science and technology, electronic and electrical equipment continue to develop in the direction of functionalization, integration, high frequency, and digitization, and the resulting electromagnetic interference hazards are becoming more and more serious. On the one hand, the electromagnetic interference generated by electromagnetic radiation has a serious impact on the routing design inside the electronic system; The environment poses a threat. Therefore, issues such as compatibility of electronic equipment, information security, electromagnetic environmental pollution and biological effects cannot be ignored. [0003] For the ...

AI Technical Summary

Problems solved by technology

In addition, the vulcanization molding temperature of this patent is too high, which will easily lead to oxidation failure of the silver-coated copper powder, reduce the overall performance of the glue, and deteriorate the environmental resistance performance.

[0006] To sum up, the problems existing in the current conductive rubber patents include: (1) solid conductive rubber cannot meet the requirements of on-site molding; (2) the filling amount of conductive powder is high, resulting in high production costs, and at the same time too much filling The particles will also significantly reduce the fluidity of the glue, thereby affecting the on-site dispensing process; (3) the added conductive powder has a single form, and in order to achieve the same conductivity, the filling amount becomes larger; (4) the patent uses AB double groups There are many separations, and the on-site rubber mixing is easy to cause uneven mixing and affect the overall performance

(5) If the vulcanization molding temperature is too high, it will easily lead to oxidation failure of silver-clad copper powder, decline in overall performance, and deterioration of environmental resistance

Images