Conductive fluorinated silicone rubber foam composite material as well as preparation method and application thereof

Abstract

The invention discloses a conductive fluorinated silicone rubber foam composite material, a preparation method thereof and application of the conductive fluorinated silicone rubber foam composite material in the field of gas-sensitive detection. The preparation method comprises the following steps: ultrasonically dispersing carbon conductive particles in an organic solvent which is volatile at normal temperature to obtain conductive particle dispersion liquid; stirring perfluorosilicone oil, hydrogen-containing fluorosilicone oil and conductive particle dispersion liquid in an organic solvent until the organic solvent is completely volatilized, then adding a foaming agent and an inhibitor, performing uniform mixing to obtain a component A, and uniformly mixing perfluorosilicone oil and a platinum catalyst to obtain a component B; mixing the component A and the component B, performing uniform stirring, reacting at room temperature for 5-30 minutes, and crosslinking and curing the obtained product at 50-125 DEG C for 10-60 minutes to obtain the conductive fluorinated silicone rubber foam composite material.

Description

technical field [0001] The invention relates to the field of fluorosilicone rubber foam composite materials, in particular to a conductive fluorosilicone rubber foam composite material and a preparation method and application thereof. Background technique [0002] Gas sensor is an important device used in the fields of environmental monitoring, industrial process control and safety control. In recent years, conductive polymer composite (CPC) sensors have shown promising application prospects in emerging gas sensors due to their excellent electrical properties, ease of synthesis, flexibility, light weight, and low power consumption. CPC sensors are mainly divided into conductive film sensors and conductive foam sensors according to their preparation process. The structure of the conductive film sensor is dense, the gas cannot fully contact the substrate, the responsivity is low, and the sensitive range is small. The conductive foam sensor has a porous structure. The existen...

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Problems solved by technology

The patent specification with the publication number CN 111073033 A discloses a method for preparing a superhydrophobic, conductive, and swelling-resistant fluorine-containing silicone rubber foam composite material. The prepared fluorine-containing silicone rubber foam needs to be immersed in a modified conductive solution for 1 to 2 centrifugation and drying, the process is more complex, and the sensitivity is limited

The second is to add conductive particles to the foam matrix, but a small amount of conductive filler cannot make the foam system form a good conductive path

And when the added content is high, it will increase the viscosity of the system and affect the foaming process, resulting in no foaming or limited foaming ratio and small foam porosity

At the same time, there is a problem of uneven dispersion of conductive fillers in the matrix, resulting in unstable conductivity

The patent specification with the notification number CN 109096705 B discloses a preparation method of conductive silicone foam. It is necessary to add 20 parts of conductive fillers to the matrix. If the number of parts is too high, foaming will be inhibited. All raw materials need to be pretreated, and the preparation process is cumbersome and time-consuming

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