Modified silane sealant with low modulus and high resiliency for prefabricated concrete buildings and preparation method of modified silane sealant

The invention discloses a modified silane sealant with low modulus and high resiliency for prefabricated concrete buildings and a preparation method of the modified silane sealant. The sealant is prepared from the following raw materials in parts by weight: 100 parts of an MS polymer, 80-90 parts of a plasticizer, 220-240 parts of reinforcing filler, 2-4 parts of a thixotropic agent, 0.5-1.5 partsof an antioxidant, 0.5-1.5 parts of a UV absorbent, 1-3 parts of a water-removal agent, 2-4 parts of a coupling agent and 0.5-1.5 parts of a catalyst. The sealant prepared with the method meets various indexes of sealants for building joint of concrete construction (JC/T881-2001), and the elongation rate and the rebound rate reach the maximum. In order to improve the construction smoothness, reduce viscosity of the system and extrude the sealant more easily, the quantity of a plasticizer is increased, the influence of different plasticizers on extrudability, elongation and rebound rate is investigated, and diisodecyl