Mixed hydrophilic polyisocyanate curing agent

A polyisocyanate and curing agent technology, applied in the field of water-based polymer synthesis, can solve the problems of high cost, difficult condition control, complicated process, etc., and achieve the effects of less side reactions, simple operation and small particle size

Inactive Publication Date: 2017-04-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complicated process, high cost, and difficult condition control, there is no method of adding hydrophilic gr

Method used

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  • Mixed hydrophilic polyisocyanate curing agent
  • Mixed hydrophilic polyisocyanate curing agent

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] Add 60.0g of hexamethylene diisocyanate trimer to a three-necked flask and blow in nitrogen; add 9.0g of polyethylene glycol monomethyl ether with a functionality of 0.998, and then raise the temperature to 75°C to fully react the contents of the container 5 Hours; then lower the temperature to 10°C, then slowly add 1.2g of sodium ethylenediaminoethanesulfonate, continue the reaction for 20 minutes; finally, when it reaches room temperature, stop the nitrogen gas, take out a mixed hydrophilic polyisocyanate curing Agent.

[0029] The calculated -NCO content of the obtained mixed hydrophilic polyisocyanate curing agent is 15.9%; the tested viscosity is 47.1 mPa·s; the tested average particle size is 277.7 nm.

[0030] Perform infrared test on the obtained mixed hydrophilic polyisocyanate curing agent, figure 1 Its infrared spectrum, 2273cm -1 Where is -NCO, 1106cm -1 Ether bond absorption peak at, where -SO 3 - The symmetrical and asymmetrical stretching vib...

Example Embodiment

[0031] Example 2

[0032] Add 70.0g of hexamethylene diisocyanate trimer to a three-necked flask and blow in nitrogen; add 3.5g of polyethylene glycol monomethyl ether with a functionality of 0.997, and then heat to 70°C to allow the contents of the container to fully react 5 Hours; then lower the temperature to 0°C, then slowly add 1.4g of sodium ethylenediaminoethanesulfonate, continue the reaction for 30 minutes; finally, when it reaches room temperature, stop the nitrogen gas, take it out to obtain a mixed hydrophilic polyisocyanate curing Agent.

[0033] The calculated -NCO content of the obtained mixed hydrophilic polyisocyanate curing agent was 18.0%; the tested viscosity was 47.5 mPa·s; the tested average particle size was 260.2 nm.

[0034] Infrared test of the obtained mixed hydrophilic polyisocyanate curing agent, 2273cm -1 Where is -NCO, 1106cm -1 Ether bond absorption peak at, where -SO 3- The symmetrical and asymmetrical stretching vibration peaks are located at 1091cm...

Example Embodiment

[0035] Example 3

[0036] Add 70.0g of hexamethylene diisocyanate trimer to a three-necked flask, and pour into nitrogen; add 7.0g of polyethylene glycol monomethyl ether with a functionality of 0.998, and then increase the temperature to 75°C to allow the contents of the container to fully react 5 Hours; then lower the temperature to 20°C, then slowly add 0.7g of sodium ethylenediaminoethanesulfonate, continue the reaction for 15 minutes; finally, when it reaches room temperature, stop the nitrogen gas, take out a mixed hydrophilic polyisocyanate curing Agent.

[0037] The calculated -NCO content of the obtained mixed hydrophilic polyisocyanate curing agent was 17.3%; the tested viscosity was 51.3 mPa·s; the tested average particle size was 248.3 nm.

[0038] Infrared test of the obtained mixed hydrophilic polyisocyanate curing agent, 2273cm -1 Where is -NCO, 1106cm -1 Ether bond absorption peak at, where -SO 3 - The symmetrical and asymmetrical stretching vibration peaks are locat...

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Abstract

The invention relates to a mixed hydrophilic polyisocyanate curing agent, and belongs to the field of waterborne high polymer synthesis. The mixed hydrophilic polyisocyanate curing agent is prepared through a "two-step system" by taking polyglycol monoether, polyisocyanate and sulfamate as raw materials. The mixed hydrophilic polyisocyanate curing agent comprises hydrophilic groups such as sulfonic groups and ether groups, and can be dispersed in water very well. The content of isocyanato of the mixed hydrophilic polyisocyanate curing agent is above 11.3wt%, an emulsion of the mixed hydrophilic polyisocyanate curing agent is small in particle size and low in viscosity and is stable. The mixed hydrophilic polyisocyanate curing agent can be used for a bi-component waterborne polyurethane curing cross-linking agent, and has application values in the fields of waterborne polyurethane wood lacquer, fabric coatings, leather finishes, waterborne adhesives, and the like.

Description

technical field [0001] The invention relates to a mixed hydrophilic polyisocyanate curing agent, which belongs to the field of water-based polymer synthesis. Background technique [0002] Polyisocyanate curing agent is a kind of substance that promotes or controls the curing reaction prepared from polyisocyanate. The composition and structure of polyisocyanate are relatively stable, but the cross-linkable isocyanate group (-NCO) contained in polyisocyanate is very easy to react with water. Therefore, in order to enable the polyisocyanate curing agent to be mixed with water but not to react with water, it is necessary to perform hydrophilic modification on the polyisocyanate curing agent. The synthetic hydrophilic polyisocyanate curing agent is to add an emulsifier to the polyisocyanate or introduce a hydrophilic group into the chain so that the polyisocyanate can be stably dispersed in water, so that it can fully react with the hydroxyl component and speed up the drying tim...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/79C08G18/38C09D175/08
CPCC08G18/4833C08G18/3855C08G18/797C09D175/08
Inventor 罗运军尹绚柴春鹏葛震
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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