Long-chain alkyl silicone oil type silicon paste and preparation method and application thereof

The invention discloses long-chain alkyl silicone oil type silicon paste and a preparation method and application thereof. The method comprises the following steps: adding 1-dodecene into a reactor, adding a platinum catalyst and hydrogen-containing silicone oil at 75-95 DEG C under the condition of nitrogen or inert gas, and performing uniform stirring; carrying out a pre-reaction for 0.5-1 h ata temperature of 65-95 DEG C, and then carrying out a reaction for 1-5 h at a temperature of 110-150 DEG C; after the pre-reaction is started for 0-4 hours, adding fumed silica; and ending the reaction to obtain the long-chain alkyl silicone oil type silicon paste. Silicon-hydrogen bonds of hydrogen-containing silicone oil react with hydroxyl groups on the surface of gas silicon to generate silicon-oxygen bonds, long-chain silicone oil molecules are connected to the surface of the gas silicon to prepare the silicon paste, and the dispersion stability of the silicon paste and the defoaming andfoam inhibition performanc