Solvent-free polyurethane dispersoid with controllable particle size and waterborne polyurethane coating solution

A technology of polyurethane dispersion and water-based polyurethane, which can be used in coatings, textiles, papermaking, gloves, etc. It can solve the problems that fingers cannot move flexibly, and the outer surface cannot be formed smoothly, so as to achieve environmental friendliness, smooth film formation and simplified process The effect of the process

Active Publication Date: 2020-04-17
HONGBAOLI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the particle size of the water-based polyurethane dispersion is too small, the coating will enter the inside of the glove before the film is formed, causing the outer surface to fail to form a film smoothly. At this time, the inner and outer surfaces of the knitted glove will become very hard due to the coagulation of the particles. Inability to move fingers flexibly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare a 1L three-neck flask, install a stirrer, a thermometer, nitrogen protection and a temperature control device. Add 63 parts of dried polyether diol (number-average molecular weight 1000, functionality 1.92) and 2 parts of 2,2-dimethylolbutyric acid into the flask, heat to 110°C, and stir at 110-120 rpm. After the premix is ​​melted, cool down to 70°C. Then slowly add 27 parts of isophorone diisocyanate into the reaction flask, and keep the reaction temperature at 80~90°C. Finally, when the NCO% of the prepolymer reached the theoretical value, the temperature was immediately lowered to 40-50 °C to obtain 1# prepolymer with an NCO% of 4%.

[0042] Take 11 parts of 1# prepolymer, and add 0.2 parts of triethylamine to it, react for 10 min, and carry out neutralization. Add 11.3 parts of water to the reaction flask, and stir at 400-500 rpm for 15 min. A mixture of 0.42 parts of piperazine and 10 parts of water was added into the reaction flask for chain extension ...

Embodiment 2

[0045] Prepare a 1L three-neck flask, install a stirrer, a thermometer, nitrogen protection and a temperature control device. Add 65 parts of dried polyether diol (number average molecular weight 2000, functionality 1.87), 1 part of 1,4-butanediol, and 3 parts of 2,2-dimethylol propionic acid into the flask, and heat to 110 ℃, stirring speed 110~120 rpm. After the premix is ​​melted, cool down to 70°C. Then 16 parts of isophorone diisocyanate and 8 parts of 4,4-diphenylmethylene diisocyanate were mixed at a molar ratio of 1:0.44, and slowly added to the reaction flask, and the reaction temperature was kept at 80~90 °C. Finally, when the NCO% of the prepolymer reaches the theoretical value, the temperature is immediately lowered to 40~50 °C to obtain 2# prepolymer with an NCO% of 3%.

[0046] Take 20 parts of 2# prepolymer, and add 0.4 parts of triethylamine to it, react for 10 min, and carry out neutralization. Then add 43 parts of water to the reaction flask, and stir at 4...

Embodiment 3

[0049] Prepare a 1L three-neck flask, install a stirrer, a thermometer, nitrogen protection and a temperature control device. Add 70 parts of dried polyether diol (number average molecular weight 1000, functionality 1.92), 2 parts of 1,4-butanediol, 4 parts of 2,2-dimethylol butanoic acid into the flask and heat to 110 ℃, stirring speed 110~120 rpm. After the premix is ​​melted, cool down to 70°C. Then 29 parts of isophorone diisocyanate and 8 parts of 4,4-diphenylmethylene diisocyanate were mixed at a molar ratio of 1:0.25, and slowly added to the reaction flask, and the reaction temperature was kept at 80~90 °C. Finally, when the NCO% of the prepolymer reached the theoretical value, the temperature was immediately lowered to 40-50 °C to obtain 3# prepolymer with an NCO% of 3.2%.

[0050] Take 25 parts of 3# prepolymer, and add 0.78 parts of triethylamine to it, react for 10 min, and carry out neutralization. Then add 200 parts of water to the reaction flask, and stir at 4...

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Abstract

The invention discloses a solvent-free polyurethane dispersoid with particle size controllable and a waterborne polyurethane coating liquid, and particularly relates to the technical field of dispersoids and coating liquids; the average particle size of the solvent-free polyurethane dispersoid is 400-1500 [mu]m, and the solid content of the solvent-free polyurethane dispersoid is 10%-45%; the solvent-free polyurethane dispersoid can be made into the waterborne polyurethane coating liquid with the solid content of 9%-25%, and the waterborne polyurethane coating liquid is composed of the raw materials in parts by weight: 100 parts of the solvent-free polyurethane dispersoid, 0.1-3 parts of a thickening agent, 0.1-4 parts of a wetting agent, 0.1-5 parts of a defoaming agent and the balance being water. The invention aims to control the particle size of the waterborne polyurethane dispersoid particles, so that the waterborne polyurethane dispersoid is only coated on the outer surface of gloves and does not permeate into a glove fabric, and the gloves have good flexibility. The waterborne polyurethane coating liquid provided by the invention can ensure smooth film formation, is environment-friendly, and is non-toxic even after long-term use.

Description

technical field [0001] The invention belongs to the technical field of dispersions and coating liquids, in particular to a solvent-free polyurethane dispersion and water-based polyurethane coating liquid with controllable particle size. Background technique [0002] In industrial settings, gloves need to not only provide protection but also provide a good grip. Therefore, the industry often uses knitted lined gloves, that is, the glove liner is sewn with natural or synthetic fibers, and then the outer surface is partially or completely coated with various functional polymer materials to be suitable for different production departments. Coating polymers commonly used in the market are rubber, polyvinyl chloride, polyurethane, nitrile rubber and other polymer materials. [0003] Rubber is the earliest glove coating material, which has the characteristics of low price, good cut resistance and good wear resistance. However, toxic substances will be released during the preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/48C08G18/34C08G18/32D06N3/14
CPCC08G18/12C08G18/6692C08G18/6674C08G18/6685C08G18/6688C08G18/4825C08G18/348C08G18/3206C08G18/4808C08G18/4829C08G18/4812D06N3/146D06N2203/068D06N2205/023D06N2211/103C08G18/3246C08G18/3271C08G18/3228
Inventor 李时浩邢益辉许亮夏炎张蒙蒙
Owner HONGBAOLI GRP CO LTD
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