Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Environment-friendly polyurethane curing agent, method for preparing same and application of environment-friendly polyurethane curing agent

A polyurethane curing agent, environmentally friendly technology, used in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve the problem of not meeting the needs of supporting curing agent varieties, limited isocyanate water-based curing agents, and no such products. Sales and other issues, to achieve the effects of good storage stability, good water dispersibility, and a wide range of unsealing temperatures

Active Publication Date: 2018-03-13
FOSHAN JINGXIN HUIMING TECH CO LTD
View PDF7 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103554430A discloses that compound A is obtained by sealing the trimer of isocyanate with methyl ethyl ketone oxime, reacting diisocyanate with polyethylene glycol monomethyl ether to obtain emulsifier B, mixing A and B, adding deionized water to emulsify to obtain blocked polyisocyanate A method for preparing an aqueous emulsion of a crosslinking agent. The hydrophilic agent used in this method is non-ionic, and the water-based polyurethane curing agent produced has the disadvantages of poor water dispersibility, poor stability, and poor water resistance of the finished product.
CN101649036A discloses reacting diisocyanate monomers with dihydric alcohols and trihydric alcohols to generate branched polyisocyanates, and then blocking the end NCO after chain extension by a hydrophilic chain extender, and finally adding amine to neutralize the salt to form a closed polyisocyanate. The advantage of the type curing agent is that it can be hydrolyzed and sealed at room temperature, but the disadvantage is that it can only be used for sports ground pavement
The methods for preparing blocked isocyanate water-based curing agents disclosed in current patents and existing literature are very limited, and there are no sales of such products in the actual market, or there are very few sales of trial products, which are far from satisfying a wide variety of water-based resins. Variety requirements of curing agent

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] A preparation method of an environmentally friendly polyurethane curing agent is to add a small molecule sulfonate diol chain extender to the mixture of polyisocyanate prepolymer and diisocyanate to carry out chain extension reaction to obtain polyisocyanate containing sulfonic acid groups The prepolymer is added with a hydrogen-containing compound blocking agent to block the terminal isocyanate group to obtain the above-mentioned environmentally friendly polyurethane curing agent.

[0036] The preparation method of above-mentioned a kind of environment-friendly polyurethane solidifying agent, comprises the following steps:

[0037] a) Preparation of small-molecule sulfonate diols: in an esterification kettle, the small-molecule diols and dicarboxysulfonates are subjected to an esterification reaction to obtain small-molecule sulfonate diols;

[0038] b) Preparation of polyisocyanate prepolymers containing sulfonic acid groups: in a reaction kettle, polyisocyanate prepo...

Embodiment 1

[0055] a) Preparation of small molecule sulfonate dihydric alcohol

[0056] In a four-neck flask equipped with a fractionation device, add 300g of sodium isophthalic acid-5-sulfonate, 360g of neopentyl glycol, 300g of deionized water and 0.568g of tetrabutyl titanate, nitrogen protection, at 160 ° C Reflux for 2 hours, then raise the temperature by 10°C every 0.5 hours, collect fractions in the water separator until the temperature reaches 210-220°C, keep it warm for 1 hour, vacuumize at 220°C and 1KPa for 2 hours, cool down to 100°C, add 220g of propylene glycol methyl Ether acetate, stirred evenly, then cooled to 60°C, and discharged to obtain 730g of small molecule sulfonate diol with a solid content of 70% and a number average molecular weight of 550;

[0057] b) Preparation of polyisocyanate prepolymers containing sulfonic acid groups

[0058] Add 300g of MDI-TMP adducts with a solid content of 75%, 44g of propylene glycol methyl ether acetate, 110g of MDI-50 and 120g of...

Embodiment 2

[0062] a) adopt the small molecule sulfonate dihydric alcohol prepared by embodiment 1

[0063] b) Preparation of polyisocyanate prepolymers containing sulfonic acid groups

[0064] Adding 300g solid content in the reactor is the adduct of 75% TDI-TMP, 24g propylene glycol methyl ether acetate, 120gMDI-50 and embodiment 1 step a) the small molecular sulfonate glycol 130g that obtains, heat up React at 60°C for 1 hour, at 70°C for 1 hour, and at 80°C for 3 hours;

[0065] c) preparation of environment-friendly polyurethane curing agent

[0066] Lower the temperature to 60-70°C, add 153g of methyl ethyl ketone oxime in six times, control the feeding temperature at 60-70°C, and finish adding in 2 hours. Discharge, get environment-friendly polyurethane curing agent. The appearance of the curing agent is light yellow transparent viscous liquid with a solid content of 60% and a viscosity of 4800 mPa·s (25° C.).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses an environment-friendly polyurethane curing agent, a method for preparing the same and application of the environment-friendly polyurethane curing agent. The environment-friendly polyurethane curing agent comprises blocked polyisocyanate prepolymers with sulfonic acid groups. Chain extension reaction is carried out on polyisocyanate prepolymers, diisocyanate and chain extenders, and then blocking agents are added into reaction products to block end isocyanate groups to form the blocked polyisocyanate prepolymers with the sulfonic acid groups. The environment-friendly polyurethane curing agent, the method and the application have the advantages that the environment-friendly polyurethane curing agent is good in water dispersibility, excellent in storage stability, wide in deblocking temperature range and applicable to manufacturing water-base baking varnish and water-base high-temperature glue and has an excellent application prospect in the aspect of heat-sensitive material coating, and the performance of water-base resin can be obviously improved.

Description

technical field [0001] The invention relates to an environment-friendly polyurethane curing agent and its preparation method and application. Background technique [0002] Two-component polyurethane coatings and adhesives have the advantages of low film-forming temperature, strong adhesion, high wear resistance, high hardness, good solvent resistance and water resistance, and are used in a large amount in the market. With the national standard for VOC The law enforcement of the restriction of content has been strengthened, and many companies have made a lot of efforts in the development of high-performance and environmentally friendly products: one is to minimize the amount of solvent used, and the other is to reduce the content of free diisocyanate monomers in polyurethane curing agents, that is, to develop Curing agent for water-based hydroxyl resins and low-residue TDI and HDI monomers. At present, there are many kinds of water-based hydroxyl resins on the market, but th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G18/38C08G18/76C08G18/10C09D175/04C09J175/04
Inventor 周建明何绍群刘晓鸿
Owner FOSHAN JINGXIN HUIMING TECH CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com