Dam adhesive and preparation method thereof, and fumed silica and preparation method thereof

The invention is applicable to the field of high polymer materials, and provides dam adhesive, a preparation method of the dam adhesive, fumed silica and a preparation method of the fumed silica. Thedam adhesive includes a component A and a component B, wherein the component A is prepared from 30 to 50 parts of vinyl silicone oil, 5 to 40 parts of vinyl silicone oil, 10 to 50 parts of silicon resin, 5 to 20 parts of modified fumed silica and 0.1 to 2 parts of photoinitiator; the component B comprises the following components in parts by weight: 30-50 parts of vinyl silicone oil, 5-40 parts ofvinyl silicone oil, 10-40 parts of hydrogen-containing silicone oil, 5-20 parts of modified fumed silica, 5-20 parts of silicon resin, 0.1-2 parts of an adhesive and 0.01-2 parts of a thixotropic agent; during use, the component A and the component B are mixed according to the weight ratio of 1 : (0.8-1.2). The dam dam adhesive has the advantages of moderate viscosity, low curing temperature, easiness in application, good