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Synthesis method of waterborne polyurethane emulsion

A technology of water-based polyurethane and synthesis method, applied in the field of synthesis of water-based polyurethane emulsion, can solve the problems of unstable product state, large differences in the degree of difficulty of water dispersion, loss of water-dispersibility of synthetic products, etc., and achieve the effect of avoiding side reactions

Inactive Publication Date: 2010-11-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the difficulty in the synthesis of water-based polyurethane is that the degree of reaction is difficult to control, resulting in unstable state of the product, and the difficulty of water dispersion varies greatly. The appearance of the product can be water-soluble glue, water-dispersed latex, or emulsion.
In some cases, gelation or burst polymerization is prone to occur during the synthesis process, resulting in the complete loss of water dispersibility of the synthesized product

Method used

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  • Synthesis method of waterborne polyurethane emulsion
  • Synthesis method of waterborne polyurethane emulsion
  • Synthesis method of waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 (acetone method)

[0031] Weigh 125.6g of polyether polyol MN-3050 into a 1000ml three-necked flask, and vacuum dehydrate it in an oil bath at 110-120°C for 1 hour. Then cool down to 70°C, add 15g isophorone diisocyanate (IPDI), 17.7g dicyclohexylmethane diisocyanate (HMDI), 6.3g dimethylolpropionic acid (DMPA), 2d dibutyltin dilaurate as a catalyst , and 10ml of acetone was added as a diluent, the temperature was raised and the oil bath was controlled at 80-90°C, and the reaction was stirred for 2h. Lower the temperature and control the oil bath to 70-80°C, then add 2.3g of butanediol and 6ml of acetone, react for 1 hour and then cool down to 40°C, add 9.5g of triethylamine-dichloromethane complex, stir well, then add 200ml of water, Stirring was continued for 1 h to obtain a white emulsion with a solid content of 45%.

Embodiment 2

[0032] Embodiment 2 (acetone method)

[0033] Weigh 100g polybutylene adipate (M n =1000) in a 1000ml three-neck flask, vacuum dehydrated in an oil bath at 110-120°C for 1h. Then cool down to 80°C, add 76g isophorone diisocyanate (IPDI), 7.0g dimethylolpropionic acid (DMPA), 2d dibutyltin dilaurate as catalyst, and add 10ml acetone as diluent, control the oil bath 80 ~ 90 ° C, stirred for 2 hours. Then add 4.1g of diethylene glycol and 20ml of acetone, react for 2h, then cool down to 40°C, add 10.0g of triethylamine-dichloromethane complex for neutralization reaction, then add 190ml of water, stir and disperse to obtain solid 50% white emulsion.

Embodiment 3

[0034] Embodiment 3 (prepolymer method)

[0035]Weigh 50g of polyether polyol MN-3050 into a 500ml three-neck flask, and vacuum dehydrate it in an oil bath at 110-120°C for 1 hour. Then cool down to 70°C, add 13.3g of isophorone diisocyanate (IPDI), 8.4g of hexamethylene diisocyanate (HDI), 1d of dibutyltin dilaurate as a catalyst, heat up and control the oil bath at 80-90°C, The reaction was stirred for 2h. Add 6.3g of dimethylolpropionic acid (DMPA) and 8ml of acetone, control the oil bath at 70-80°C, and stir for 1h. Then the temperature was lowered to 40° C., and 9.5 g of triethylamine-dichloromethane complex was added for neutralization to obtain a prepolymer. Slowly add this prepolymer into 130ml of aqueous solution in which 3.0g of ethylenediamine is dissolved under the condition of rapid stirring, and obtain a white emulsion with a solid content of 40% after dispersion.

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Abstract

The invention relates to a synthesis method of waterborne polyurethane emulsion. In the synthesis method of the anion type waterborne polyurethane emulsion taking polyhydroxy alkyl acid as the hydrophilic component, the triethylamine-dichloromethane complex is used to replace triethylamine as a salt forming agent and conducts acid-base neutralization reaction with carboxylic groups to form salts; simultaneously, the hydration difficulty caused by the catalytic action of triethylamine on secondary reactions between isocyanate and carboxylic acid as well as between isocyanate and water, ect can be reduced, thereby obtaining the waterborne polyurethane emulsion with stable state under the wider technological conditions.

Description

technical field [0001] The invention relates to a method for synthesizing an aqueous polyurethane emulsion. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, which reduces the use of volatile organic compounds (VOC). It has the characteristics of non-combustibility, low odor, no pollution to the environment, energy saving, and convenient operation and processing. It is widely used in wood coatings, construction, automobiles, and aircraft glass fibers. There are broad prospects for development in many fields such as sizing, adhesives, papermaking, printing and dyeing, and leather finishing. [0003] The synthesis methods of waterborne polyurethane are divided into two categories: external emulsification method and self-emulsification method (see Xu Gewen, "Waterborne Polyurethane Materials", Chemical Industry Press, 2009). The external emulsification method is that in 1943, P. Schlack in Germany used an external emulsifier and protec...

Claims

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Application Information

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IPC IPC(8): C08G18/83C08G18/10C08J3/03
Inventor 李文峰王国建
Owner TONGJI UNIV
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