Anti-fouling single-component room temperature sealing silicone sulfide glue and its production process

Abstract

The anti-fouling single-component room temperature sealing silicone sulfide glue features that silicon oil with molecular end radical Si-H and dry oil addition component as anti-fouling component in 5-30 weight portions, poly(alpha, omega-dihydroxy siloxane in 100 weight portions and active calcium carbonate in 70-130 weight portions are dewatered and mixed in a vacuum stirrer at 100-150 deg.c and vacuum degree of 0.06-0.099 MPa for 30-200 min, and cooled to obtain the base material. At room temperature, cross-linking agent in 5-15 weight portions, silane coupler in 0.5-5 weight portions and catalyst in 0.5-1.5 weight portions are then added inside a high speed dispersing stirrer or a planetary stirrer at vacuum degree 0.06-0.099 MPa and rotation speed 200-600 rpm for 30-150 min.

Description

technical field [0001] The invention relates to an anti-pollution single-component room temperature vulcanized silicone sealant and a manufacturing method thereof, belonging to the field of polymer sealing materials and its manufacturing. Background technique [0002] Room temperature vulcanized silicone sealant can be vulcanized into an elastomer when exposed to moisture in the air without heating, light or other special conditions at room temperature, and it is very convenient to use. The vulcanized sealant has excellent high and low temperature resistance, good water resistance, excellent weather aging resistance, ozone, ultraviolet and other properties, and has a service life of several decades. It has excellent and long-lasting adhesion to various substrates such as aluminum alloy, glass, metal, stone, cement, etc., and good elasticity means anti-displacement ability, etc. Therefore, silicone sealants are widely used in the construction industry, especially in the curt...

AI Technical Summary

Problems solved by technology

As we all know, the surface of the vulcanized silicone sealant is very easy to absorb dust, and at the same time, due to the slow seepage of oily plasticizers and a small amount of low molecular substances in the silicone sealant, it will pollute the surrounding substrates of the building.

In order to reduce the dust deposited on the surface of the silicone sealant and the pollution to the surrounding substrates of the building, Japanese Patent Laid-Open No. 62-1750 and 62-7763 add dry oils such as tung oil and hydrogenated castor oil to the formula, although they have anti-pollution properties. , but the dry oil of the sealant is slowly precipitated from the sealant during storage, thereby affecting the shelf life of the sealant, and the surface of the sealant is easy to change color; U.S. Patents US 4460740, US 4695603 and Japanese Patent Laid-Open No. 56-76453, 56 -76542 reports adding surfactants to the sizing material. This method has a temporary anti-fouling effect, and the deposition of dust on the surface of the sealant reduces, but it will greatly affect the adhesion of the silicone sealant to the base material; US 5357025 adds fluorine-containing Carbon-based siloxane agent, fluorocarbon-based siloxane agent and dry oil such as tung oil, hydrogenated castor oil are used to prepare the room temperature vulcanized silicone sealant to form a dry oil oxidation product layer on the surface of the vulcanized sealant to play a role Antifouling effect

However, this dry oil oxidation product layer will gradually disappear when exposed to the atmosphere, and the cleaning effect will gradually lose, and the surface will be dust-absorbed and moldy, and the cost is high