Super-hydrophobic, conductive and swelling-resistant fluorinated silicone rubber foam composite material and preparation method thereof

Abstract

The invention discloses a super-hydrophobic, conductive and swelling-resistant fluorinated silicone rubber foam composite material and a preparation method thereof. The preparation method comprises the following steps: (1) dispersing carbon conductive particles in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, stirring, oxidizing, centrifuging, washing with water, drying to obtain hydroxylated conductive particles, adding the hydroxylated conductive particles into deionized water containing a surfactant, and carrying out ultrasonic dispersion to obtain a conductive solution; (2) adding a fluorine-containing silane coupling agent and deionized water into ethanol, and carrying out ultrasonic hydrolysis to obtain a fluorine-containing silane coupling agent hydrolysate; (3) immersing fluorine-containing silicone rubber foam into the conductive solution in the step (1), and performing steps of centrifuging and drying; and (4) repeating the step (3) for 1-2 times to prepare a conductive fluorine-containing silicone rubber foam material, then soaking the conductive fluorine-containing silicone rubber foam material into the fluorine-containing silane couplingagent hydrolysate in the step (2), centrifuging and drying to obtain the fluorine-containing silicone rubber foam material.

Description

Technical field [0001] The invention relates to the technical field of functional composite materials, in particular to a super-hydrophobic, conductive, and swell-resistant fluorine-containing silicone rubber foam composite material and a preparation method thereof. Background technique [0002] Silicone rubber foam is a porous and lightweight polymer foam material prepared by foaming silicone rubber. It has the advantages of light weight, good compression recovery performance, high and low temperature resistance, physiological inertia, and electrical insulation performance. It has very important application value in life. [0003] With the development of actual needs, especially in some specific fields such as aerospace, rail transit and new energy vehicles, people have put forward higher requirements for the multi-functional properties of materials. For example, by adding conductive particles, the silicone rubber foam can be achieved. Conductivity, realize antistatic effect, and...

AI Technical Summary

Problems solved by technology

When adding conductive particles to the matrix, a small amount of conductive particles cannot form a good conductive path. When the added content is high, the viscosity of the system will increase, which will affect the foaming process, resulting in no foaming or reduced porosity. Small, which affects the compression and shock resistance of the foam

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

The patent specification with the publication number CN 109294239 A discloses a preparation method of antistatic silicone rubber foam, which needs to add 20 to 50 parts of conductive materials in the matrix, the number of parts is too high, the processing is difficult and the process is complicated

The patent specification with the publication number CN 105504820 A discloses a preparation method of conductive silicone rubber foam. The amount of conductive filler added is 10 to 40 parts. The radiation crosslinking method is adopted, and the equipment requirements are high; the second is to coat conductive particles on the foam On the surface, conduction can be realized by a small amount of conductive particles, but the conductive particles are electrostatically adsorbed on the substrate, and the interface force between the conductive particles and the substrate is poor, and it is easy to fall off, resulting in a decrease in conductivity and weak force

The literature (Appl. Mater. Interfaces 2018, 10, 13877~13885) uses the method of coating to build a conductive network on the surface of silicone rubber foam, but it is attracted by positive and negative charges, and the force is weak

[0004] In addition, when the conductive silicone rubber foam is used in a special environment, it will be in contact with liquid media (water, oil, organic solvents, etc.), which makes the main chain and side groups of the silicone rubber molecule Si-O prone to breakage and rearrangement, and molecular interaction. The mechanical properties of the network become poor, and the cell structure will be deformed, the cell wall will be broken, etc., which will make the foam lose its mechanical properties and electrical conductivity, which limits its further application.

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