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Silicon modified double cross-linking type aqueous polyurethane curing agent and preparation method thereof

A water-based polyurethane and double cross-linking technology, which is applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve problems such as poor dispersion, short pot life, and reduced product storage stability. Improve performance and stability, increase the effect of hardness

Active Publication Date: 2012-07-25
肇庆千江高新材料科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, problems such as poor dispersibility in water, large particle size and short pot life
In addition, when using molecular chain regular polyether with a molecular weight greater than 800, it is often accompanied by the problem that the product is easy to crystallize, which reduces the storage stability of the product

Method used

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  • Silicon modified double cross-linking type aqueous polyurethane curing agent and preparation method thereof
  • Silicon modified double cross-linking type aqueous polyurethane curing agent and preparation method thereof
  • Silicon modified double cross-linking type aqueous polyurethane curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Add 300g of HDI trimer into a 500mL four-necked bottle equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and gradually add 45g of modified polyethylene oxide polyether A into the four-necked bottle dropwise for half an hour. After completion, the process is kept at 100-110° C., and the total reaction time is 2.5 hours to end the cooling and discharging.

[0064] in,

[0065] NCO content: 16.13%

[0066] Solid content: 100%

[0067] Viscosity (23°C): 3200mPa·s.

Embodiment 2

[0069] Add 300g of HDI trimer and 51g of modified polyoxyethylene polyether B into a 500mL reactor equipped with a stirrer and a thermometer, raise the temperature to 100-110°C, react for 2.5 hours, and finish cooling and discharging.

[0070] in,

[0071] NCO content: 15.79%

[0072] Solid content: 100%

[0073] Viscosity (23°C): 3700mPa·s.

Embodiment 3

[0075] Add 300g of HDI trimer into a 500mL four-necked bottle equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and gradually add 39g of modified polyethylene oxide polyether C to the four-necked bottle dropwise for half an hour. After completion, the process is kept at 100-110° C., and the total reaction time is 2.5 hours to end the cooling and discharging.

[0076] in,

[0077] NCO content: 16.72%

[0078] Solid content: 100%

[0079] Viscosity (23°C): 3100mPa·s.

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Abstract

The invention discloses a silicon modified double cross-linking type aqueous polyurethane curing agent and a preparation method thereof. The aqueous polyurethane curing agent is formed by mixing and reacting polyisocyanate, organo silicone modified polyethylene oxide ether, organo silicone, a catalyst, a terminator and a proper amount of solvent. The invention relates to a synthesis method of the curing agent as well as a performance test and application of the curing agent. The hardness, water-resistance chemical resistance performance aspects of a paint film prepared by using the organo silicon modified curing agent is improved in the aspects of hardness, water resistance and chemical resistance.

Description

technical field [0001] The invention relates to a silicon-modified double-crosslinked water-based polyurethane curing agent and a preparation method thereof. Background technique [0002] Out of comprehensive consideration of environmental protection and cost-effectiveness, more and more chemical workers are committed to developing new coatings that can reduce VOC emissions without affecting resin performance. Therefore, the water-based coating has become an important means. [0003] The use of polyether water-soluble polymers for the nonionic modification of polyisocyanates has been documented in a large number of literatures. For example, in the document US5468804, polyethylene glycol monomethyl ether is used to modify the TDI / TMP adduct, so that the adduct of toluene diisocyanate and trihydroxypropane is easily dispersed in water; in document US4663377, polyethylene glycol monomethyl ether is used to Ether hydrophilically modified HDI trimer, so that the modified HDI tr...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/50C08G65/336C08G65/48C09D175/08C09J175/08D06M15/568C09D11/10C09D11/102
Inventor 李会宁吕夏阳王江兵
Owner 肇庆千江高新材料科技股份公司
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