A kind of high elongation silicone sealant and preparation method thereof

Abstract

The invention relates to a high-elongation silicone sealant, which comprises the following raw materials in parts by mass: α,ω-dimethoxy polydimethylsiloxane with a viscosity of 0.5-250,000 centipoise 25 to 65.4 parts, 0.2 to 1.8 parts of polyether polyol chain extender with a viscosity of 60 to 600 centipoise, 8 to 22 parts of base material, 20.5 to 45.5 parts of filler, 2.5 to 4.2 parts of crosslinking agent, 0.8 to 0.8 parts of primary titanium 1.6 parts, 0.5-1.2 parts of secondary titanium, 0.14-0.58 parts of coupling agent, 0.02-0.06 parts of catalyst, the base material is composed of methyl silicone oil with a viscosity of 50-1500 centistokes, active calcium carbonate with a particle size of 20-100nm and hydroxyl scavenger composition. The silicon-copper sealant provided by the invention can improve the anti-displacement ability, and is used in construction occasions such as aluminum plate curtain wall joints, bridges, airport concrete pavement gaps, caulking and sealing of expansion joints, etc., and the effective service life of the sealant is longer.

Description

technical field [0001] The invention belongs to the technical field of silicone sealants, and in particular relates to a high-elongation silicone sealant and a preparation method thereof. Background technique [0002] Organic silicone sealant is a polymer compound with Si-O bond three-dimensional network structure, its Si-O bond energy is as high as 425KJ / mol, good stability, strong weather resistance, excellent stain resistance, high Low temperature, good hydrophobicity and air permeability, etc., can be used for a long time in the range of -60 ~ 200 ℃, so its application field is also expanding, and has gradually expanded from the field of construction to the fields of automobiles, aviation, aerospace and marine engineering. middle. [0003] Since the 1980s, with the prefabrication and high-rise construction of domestic buildings and the extensive use of flexible structures of glass and metal curtain walls and large-scale frame-type hanging panel structures, a large numbe...

AI Technical Summary

Problems solved by technology

[0006] 1. α, ω-dihydroxypolydimethylsiloxane (referred to as 107 glue) is generally used as the base glue for ordinary silicone glue on the market, and there is no chain extension reaction. The elasticity and elongation of the prepared silicone glue Low, resulting in poor displacement resistance of the sealant;

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