Polyurethane sealant and preparation method thereof

Abstract

The invention discloses a polyurethane sealant and a preparation method thereof. The polyurethane sealant comprises 30-70 weight percent of performed polymer, dinonyl phthalate, carbon soot, N,N-dimethyl benzylamine, byk-111, oxazolidine, epoxy silicone hydride and amino-group silicone hydride, wherein the performed polymer is obtained through the reaction of polyoxyalkylene dihydric alcohol, polyoxypropylene trihydric alcohol, hexamethylene glycol and 4,4'-diphenylmethane diisocyanate by taking dibutyl tin laurate as a catalyst. After being solidified, the polyurethane sealant has over 8MPa of tensile strength of elastomer and over 450 percent of elongation at break, not only has better solidifying speed at normal temperature, but also has very high solidifying speed at low temperature and low humidity. The polyurethane sealant is suitable for elastic splicing with high mechanical property, such as the elastic splicing during the installation of glass of automobiles, trains, ships, airplanes, cable cars, and the like and is suitable for the rapid splicing at low temperature and low humidity and other elastic splicing with high mechanical property.

Description

technical field [0001] The invention relates to a polyurethane sealant, in particular to a high-modulus polyurethane sealant for elastic bonding of glass, metal, ceramics, stone, wood, etc. and a preparation method thereof. Background technique [0002] Sealant is a material used to fill gaps (holes, joints, seams, etc.) and has a bonding effect on the interface of the filled base. It mainly includes: silicone (including modified silicone), polyurethane, polysulfide rubber , Acrylic esters, SBR rubber, butyl rubber, asphalt, oily caulk, etc. Elastic sealant must be used to fill gaps that are stretchable due to vibration or thermal expansion and contraction. Elastic sealant is a product that combines two functions of bonding and sealing. Among them, the three types of high-grade elastic sealants with better performance are silicone sealant, polysulfide sealant and polyurethane sealant. In recent years, elastic sealants have been used more and more widely in many industrial...

AI Technical Summary

Problems solved by technology

The present inventor finds when realizing technical scheme of the present invention, the defect that existing polyurethane sealant especially exists when automobile glass is installed: when single-component polyurethane sealant is used for automobile glass assembly and bonding, its body strength is lower than 8Mpa ( GB / T528) or elongation less than 450%

The above defects affect the application effect or work efficiency of the one-component polyurethane sealant

Images