Preparations of bicomponent PSU type liquid rubber-based sealant and PSU liquid rubber thereof

Abstract

The invention discloses a dual-component PSU-typed liquid rubber-based sealant and a preparation method of the PSU-typed liquid rubber, wherein, the sealant comprises a component A and a component B; the component A comprises PSU-typed liquid rubber, plasticizer, filling material, tackifier, antioxidant and vulcanization retarder; the component B comprises vulcanizing agent, vulcanization accelerator, plasticizer and filling material; and the component A and the component B are mixed together by normal method so as to prepare the finished product. The PSU-typed liquid rubber uses the mixture of polyether glycol and polyether-tribasic alcohol and polyisocyanate as raw materials to generate isocyanate-terminated polyurethane prepolymer under the action of acidic catalyst; furthermore, the isocyanate-terminated polyurethane prepolymer is terminated by sulfhydryl compounds to synthesize the sulfhydryl-terminated liquid rubber which takes the polyurethanes as main chain and has local crosslinking structure characteristic; the liquid rubber is taken as the basic rubber to prepare the sealant which has excellent mechanic performances and can be widely applied to the fields such as the construction of housing, plazas, roads, airports, bridges, hydraulic engineering, water conveyance project, sewage disposal engineering, and the like, the manufacture of automobiles, trains, containers, and the like, and the electric apparatuses, power, aeronautics and astronautics, and the like.

Description

1. Technical field: [0001] The invention relates to a sealant, in particular to a two-component PSU type liquid rubber-based sealant and a preparation method of the PSU type liquid rubber. 2. Background technology [0002] Sealant is a type of engineering material used to fill gaps (holes, joints or seams, etc.), and is widely used in devices and projects involving fluid storage, transmission, and energy conversion. When in use, it is a fluid or extrudable amorphous material, which is coated, extruded, and embedded in the part to be sealed through a certain process, and depends on temperature changes, solvent volatilization or chemical crosslinking to stabilize the adhesion with the substrate. Knots, and gradually set into a tough solid or elastic body. [0003] The main types of sealant are: polyurethane, polysulfide, silicone, acrylate, styrene-butadiene rubber, butyl rubber, asphalt and oily caulk, etc. Among them, polyurethane, polysulfide rubber and silicone sealant ha...

AI Technical Summary

Problems solved by technology

However, the type of polyether is not indicated, and the influence of polyether functionality on the reaction and the structure and properties of modified polysulfide rubber is not discussed.

It is proposed that this modified polysulfide rubber is very suitable for the production of various types of one-component sealants, but there is no report on it in one-component sealants