Fast-curing one-component polyurethane sealant and preparation method thereof

A polyurethane sealant, fast curing technology, applied in the field of sealant, can solve problems such as incompatibility, achieve the effect of fast curing speed and fast surface drying

Inactive Publication Date: 2010-09-01
PUYANG CITY WANQUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a single-group moisture-curing polyurethane sealant with polyurethane prepolymer as the main component is widely used. The polyurethane prepolymer is formed by the polymerization reaction of polyol compound and excess isocyanate, because the polyurethane sealant produced by this method contains free The NCO group reacts with the water in the air to cure and bond the glass. It is extremely sensitive to the humidity and temperature of the construction site, high temperature and high humidity, and the sealant cures quickly otherwise the cure is slow. Due to the obvious four seasons in my country, the temperature and humidity of the construction site The changes are great, and modern automobile manufacturers are assembly line operations. The one-component moisture-curing polyurethane elastic sealant that is sensitive to temperature and humidity is no longer suitable for the requirements of modern automobile glass assembly line operations.

Method used

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Embodiment Construction

[0022] The preparation method of terminal NCO group polyurethane prepolymer:

[0023] Take 85kg of polyether triol (average molecular weight 4500) and put it into a vacuum reactor, let the polyether triol dehydrate for 2 hours at 110°C in a vacuum environment, so that the moisture in the polyether triol is not more than 0.01%. Then lower the temperature in the vacuum reactor to 50°C, add 15kg of diphenylmethane diisocyanate, under the protection of nitrogen, stir evenly, heat to 82°C, let the polyether triol and diphenylmethane diisocyanate react for 4 hours, a terminal NCO-based polyurethane prepolymer was obtained.

[0024] The preparation method of terminal silyl group polyurethane prepolymer:

[0025] Put 102kg terminal NCO-based polyurethane prepolymer into the vacuum reactor and heat it to 50°C, add 34kgγ-aminopropyltrimethoxysilane under nitrogen protection and stir the reaction material to slowly rise to 70°C, after 1 hour of reaction, moderate Bubbling and mild exot...

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Abstract

The invention relates to a sealant, in particular to a fast-curing one-component polyurethane sealant and a preparation method thereof. The fast-curing one-component polyurethane sealant is characterized by comprising 30%-60% of prepolymer containing silyl-terminated polyurethane, 0.2%-5% of silane coupling adhesion promoter, 0.301%-0.35% of catalyst, 10%-40% of plasticizer, 10%-60% of filler and 0.05-1% of antioxidant, wherein the content of each component is represented by the weight percent. The fast-curing one-component polyurethane sealant has the advantages of fast surface drying, fast curing speed, avoidance of impacts caused by the environmental temperature and the humidity, high cross-linking density, high elongation ratio, good adhesion strength, no solvent, environmental protection and excellent adhesive performance to base materials, such as metal, ceramics, glass, silica PVC, ABC, polystyrene, polyacrylate and the like.

Description

Technical field: [0001] The invention relates to a sealant, in particular to a fast-curing one-component polyurethane sealant and a preparation method thereof Background technique: [0002] In automotive and other vehicle window and windshield glazing processes, polyurethane sealants are typically applied to the edges of the glass and the surface of the body window frame, and then the glass is bonded to the body. At present, a single-group moisture-curing polyurethane sealant with polyurethane prepolymer as the main component is widely used. The polyurethane prepolymer is formed by the polymerization reaction of polyol compound and excess isocyanate, because the polyurethane sealant produced by this method contains free The NCO group reacts with the water in the air to cure and bond the glass. It is extremely sensitive to the humidity and temperature of the construction site, high temperature and high humidity, and the sealant cures quickly otherwise the cure is slow. Due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/08C09J11/06C09K3/10
Inventor 任正义侯兴习吕孝永李金锋
Owner PUYANG CITY WANQUAN CHEM
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