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Method for producing silane modified polyurethane sealant by using secondary amino alpha-silane

A technology of polyurethane sealant and silane modification, applied in the directions of polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problem of slow curing speed of silane-modified polyurethane sealants and hydrolysis of silane-terminated prepolymers Problems such as low reactivity and difficulty in capping end-capped silanes to achieve the effect of fast curing speed, simple end-capping and short curing time

Active Publication Date: 2015-06-17
湖北新蓝天新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain a silane-terminated prepolymer, the hydrolysis reaction activity of the silane-terminated prepolymer prepared by this method is very low, and the viscosity increase changes greatly. The silane prepared by the silane-terminated prepolymer prepared by this method Modified urethane sealants also cure very slowly
[0006] (2) The end-blocking silanes used to prepare silane-terminated polyurethane prepolymers have the disadvantage of difficulty in end-capping
For example, patent CN101402845A discloses a preparation method of flame-retardant building sealant. The method is to firstly use polyol and isocyanate to react under the condition of dibutyltin dilaurate catalyst to obtain polyurethane prepolymer, and then add end-capped silane coupling agent to obtain Silane-terminated polyurethane prepolymer, and finally adding various additives and fillers to produce sealants, but the several kinds of blocked silanes used in this method have the disadvantage of difficulty in capping. In addition, this method also has the problem of excessive viscosity changes. shortcoming

Method used

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  • Method for producing silane modified polyurethane sealant by using secondary amino alpha-silane
  • Method for producing silane modified polyurethane sealant by using secondary amino alpha-silane
  • Method for producing silane modified polyurethane sealant by using secondary amino alpha-silane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Put 1500kg of polyoxypropylene glycol with a molecular weight of 8000 into a 2000kg dehydration kettle, dehydrate for 120min at a temperature of 115°C and a negative pressure of -0.08MPa, and detect that the moisture in the polyoxypropylene glycol is 150ppm.

[0046] Pour the dehydrated polyoxypropylene diol into the reactor and cool it down to 60°C, add 41kg of 1,6 hexamethylene diisocyanate and 1kg of dibutyltin dilaurate catalyst into the reactor, at a pressure of -0.08MPa~- Stir polyoxypropylene diol, 1,6 hexamethylene diisocyanate and dibutyltin dilaurate at 0.09MPa and 60°C for 120 minutes to form a polyurethane prepolymer, which is obtained by chemical titration of NCO value The NCO value of the polyurethane prepolymer is 1.2.

[0047] Add 35kg of anilinomethyltriethoxysilane to the reaction kettle, and under the condition of pressure of -0.08MPa~-0.09MPa and temperature of 80°C, anilinomethyltriethoxysilane and polyurethane in the reaction kettle The prepolymer...

Embodiment 2

[0051] Put 1300kg of polyoxypropylene diol with a molecular weight of 8000 and 200kg of polyoxypropylene triol with a molecular weight of 5500 into a 2000kg dehydration kettle, dehydrate for 180min at a temperature of 110°C and a negative pressure of -0.09MPa, and detect the polyoxypropylene diol The moisture in the alcohol and polyoxypropylene triol was 160 ppm.

[0052] Pour the dehydrated polyoxypropylene diol and polyoxypropylene triol into the reactor and cool to 70°C, add 55kg of 1,6 hexamethylene diisocyanate and 1kg of dibutyltin dilaurate into the reactor. 0.08MPa~-0.09MPa, at a temperature of 80°C, stir polyoxypropylene diol, polyoxypropylene triol, hexamethylene diisocyanate and dibutyltin dilaurate for 180 minutes to form a polyurethane prepolymer. The chemical titration method of NCO value obtained the NCO value of polyurethane prepolymer as 1.

[0053] Add 48kg of anilinomethyltriethoxysilane to the reaction kettle, and under the condition of pressure of -0.08MP...

Embodiment 3

[0057] Put 1000kg of polyoxypropylene diol with a molecular weight of 2000 and 500kg of polyoxypropylene triol with a molecular weight of 4000 into a 2000kg dehydration kettle, dehydrate for 150min at a temperature of 120°C and a negative pressure of -0.0085MPa, and detect the polyoxypropylene diol The moisture in the alcohol and polyoxypropylene triol was 155 ppm.

[0058] Pour the dehydrated polyoxypropylene diol and polyoxypropylene triol into the reactor and cool it to 65°C, add 283kg of isophorone diisocyanate and 1kg of dibutyltin dilaurate into the reactor at a pressure of -0.08MPa ~-0.09MPa, under the condition of temperature of 65℃, stir polyoxypropylene diol, polyoxypropylene triol, isophorone diisocyanate and dibutyltin dilaurate for 150min to form polyurethane prepolymer, adopt NCO value The NCO value of the polyurethane prepolymer is 2 by the chemical titration method.

[0059] Add 200kg of carbamic acid methylmethyldimethoxysilane to the reaction kettle, and und...

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Abstract

The present invention discloses a method for producing a silane modified polyurethane sealant by using secondary amino alpha-silane, which belongs to the technical field of production of silane modified polyurethane sealants. The method comprises the following steps: removing water from polyether polyol, preparing polyurethane prepolymer, synthesizing silane-terminated polyurethane prepolymer and preparing the modified polyurethane sealant, wherein in the step of synthesizing the silane-terminated polyurethane prepolymer, the used silane for termination is formed by mixing one or two kinds of compounds selected from a group of secondary amino alpha-silane such as anilino-methyl-triethoxy silane, amine formic acid methyl trimethoxy silane or amine formic acid methyl methyl dimethoxy silane; in the step of preparing the modified polyurethane sealant, a catalyst used in the step is formed by mixing one or two kinds of compounds selected from a group of metal zirconate titanate compounds such as tetra-tert-butyl orthotitanate, tetraisopropyl titanate, tetrabutyl titanate and zirconium n-butoxide. The termination process of the prepolymer is simple, and the silane modified polyurethane sealant produced by the method has fast curing speed.

Description

technical field [0001] The invention relates to the technical field of silane-modified polyurethane sealant, in particular to a method for producing silane-modified polyurethane sealant by using secondary amino α-silane. Background technique [0002] At present, commonly used sealants include polyurethane sealants, silicone sealants, and silane-modified polyurethane sealants. Polyurethane sealant has excellent properties such as high elasticity, low temperature flexibility, wear resistance and coatability, so it is widely used in the fields of construction, automobiles and ships, but in high temperature and high humidity environment, polyurethane sealant is prone to Defects such as foaming and unstable storage. Silicone sealant cures quickly, does not foam, and can be stably bonded to non-porous surfaces such as glass and metal. The rubber layer of silicone sealant has good heat and aging resistance. However, silicone sealant cannot be used with other sealing materials. Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C09K3/10C08G18/66C08G18/48C08G18/38C08G18/10
Inventor 高建秋冯才虎肖俊平赵家旭梁成凯余波冯琼华陈隽
Owner 湖北新蓝天新材料股份有限公司
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