Conductive silica gel, preparation method thereof and silica gel key
A technology of conductive silica gel and silicone rubber, which is applied in the field of silica gel products, can solve the problems of decreased surface conductivity of conductive silica gel, poor conductivity of conductive silica gel, and poor dispersion of conductive fillers, etc., to achieve moderate contact area and improve thermal decomposition. The effect of high initial temperature and high yield
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preparation example 1
[0044] A modified conductive filler, carried out according to the following steps:
[0045] Silicon nitride modification treatment:
[0046] Weigh 40kg of silicon nitride powder, put the silicon nitride powder into 300L of absolute ethanol solution, and carry out ultrasonic dispersion, the ultrasonic frequency is 40kHz, and the ultrasonic time is 1h, to obtain a silicon nitride suspension;
[0047] Under the condition that the silicon nitride suspension is stirred at a rate of 300r / min, add deionized water (the volume ratio of deionized water and absolute ethanol is 1:10), and continue to add 2kg of γ-aminopropyltriethyl Silane is prepared as reaction solution 1;
[0048] As soon as the temperature of the reaction solution was raised to 55° C., it was kept for 6 hours, filtered, and the obtained solid was washed with deionized water three times, and then freeze-dried to obtain modified silicon nitride.
[0049] Filling preparation:
[0050] Put the modified silicon nitride ...
preparation example 2-5
[0053]A modified conductive filler, which differs from Preparation Example 1 in that the weights of silicon nitride, γ-aminopropyltriethylsilane and graphene oxide dispersion are different, and the specific input amounts are shown in Table 2 below.
[0054] Table 2. Weight of silicon nitride, γ-aminopropyltriethylsilane and graphene oxide
[0055] Preparation example Silicon nitride / kg γ-Aminopropyltriethylsilane / kg Graphene oxide dispersion / L Preparation Example 1 40 2 200 Preparation example 2 40 4 200 Preparation example 3 40 6 200 Preparation Example 4 40 4 300 Preparation Example 5 40 4 400
preparation example 6-8
[0057] A modified conductive filler, which differs from Preparation Example 1 in that the choice of aminosilane coupling agent is different, and the specific choice is shown in Table 3 below.
[0058] Table 3. Choice of aminosilane coupling agent
[0059]
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