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Solvent-free method for preparing non-ionic water-borne polyurethane

A water-based polyurethane and non-ionic technology, applied in the field of polymers, can solve problems such as difficult dispersion, and achieve the effects of easy dispersion, control of the synthesis process, and uniform distribution

Active Publication Date: 2015-04-22
上海材料研究所靖江先进材料技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the problem of difficult dispersion in the self-emulsifying dispersion method is solved, and at the same time, the negative impact of the external emulsifier in the miniemulsion polymerization method is avoided, and a solvent-free non-ionic water-based polyurethane product with excellent performance is obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 500g of polyethylene glycol monomethyl ether (average molecular weight: 650) to the four-necked flask, raise the temperature to 110°C and apply vacuum for 1h, then cool down to 85°C, add 171g of isophorone diisocyanate (IPDI) to react for 2h. Then add 231 g of polyether 303 (molecular weight: 300, functionality: 3) that was vacuum dehydrated at 110°C for 1 h, and continue the reaction for 4 h to obtain a "Y"-shaped side chain nonionic hydrophilic chain extender containing 2 terminal hydroxyl groups.

[0034]Add 20g polyhexamethylene adipate diol (molecular weight is 2000), 40g polytetrahydrofuran ether diol (molecular weight is 2000), 6g polyether 303 (molecular weight is 300, functionality is 3) to four-necked flask After heating and melting the mixture, vacuumize at 110°C for 1h, then cool down to 85°C, add 58.8g of IPDI and 1 drop of zinc / bismuth composite catalyst to react for 2h, then cool down to 80°C, add 50.6g of the above-mentioned "Y"-shaped side chain non-...

Embodiment 2

[0037] Add 60g of polytetrahydrofuran ether diol (molecular weight: 2000), 6g of polyether 303 (molecular weight: 300, functionality: 3) into the four-necked flask, after heating and melting, vacuumize at 110°C for 1h, then cool down to 85°C, add 67.6 gIPDI reacted with 1 drop of zinc / bismuth composite catalyst for 2 hours, then cooled down to 75°C, added 50.9g of the "Y"-shaped side chain non-ionic hydrophilic chain extender prepared in Example 1, kept the reaction for 2 hours, and then added 7.5 g1,4-butanediol heat preservation reaction for 1.5h, then lower the temperature to below 70°C, add 57.3g of dehydrated polytetrahydrofuran ether glycol (molecular weight: 650), 4.6g of liquid paraffin and stir for 1 minute, then immediately add 276g of deionized water , disperse at a high speed (2500rpm) at a temperature lower than 20°C for 15 minutes, then rapidly raise the temperature to 50°C, add an appropriate amount of zinc / bismuth composite catalyst dropwise, stir at a low speed...

Embodiment 3

[0040] Add 20g polyhexamethylene adipate diol (molecular weight is 2000), 40g polytetrahydrofuran ether diol (molecular weight is 2000), 6g polyether 303 (molecular weight is 300, functionality is 3 ) after heating and melting, vacuumize at 110°C for 1h, then cool down to 85°C, add 58.8g IPDI and 1 drop of zinc / bismuth composite catalyst to react for 2h, then cool down to 80°C, add 50.6g of "Y" prepared in Example 1 Shaped side chain non-ionic hydrophilic chain extender, keep warm for 2 hours, then cool down to 75°C, add 3.5g of 1,4-butanediol and keep warm for 1.5h, then cool down to below 70°C, add 6.3g Mixture of ethylene glycol and 6.3g of neopentyl glycol, 4.6g of liquid paraffin, stirred for 1 minute, immediately added 281g of deionized water, dispersed at a high speed (rotating speed 2500rpm) for 15min under the condition of lower than 20°C, then rapidly raised the temperature to 50°C, and added dropwise Appropriate amount of zinc / bismuth composite catalyst, low-speed s...

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Abstract

The invention relates to a solvent-free method for preparing non-ionic water-borne polyurethane. The method comprises the following steps: firstly, synthesizing a Y-shaped side chain nonionic hydrophilic chain extender containing two terminal hydroxyl groups; secondly, reacting poly(dihydric alcohol) with isocyanate, and adding the Y-shaped side chain nonionic hydrophilic chain extender for chain extending to generate a side chain prepolymer with a -NCO terminal-group; thirdly, adding one or mixture of two of small-molecular dihydric alcohol and oligomer polyol, uniformly stirring, and immediately adding a deionized water solution to disperse at high speed; and finally heating to react to obtain a stable solvent-free nonionic waterborne oligomer emulsion. Compared with the prior art, the method has the advantage that the stable solvent-free nonionic waterborne oligomer emulsion is prepared under conditions of no additional emulsifier and little co-stabilizer.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and relates to a method for preparing an environment-friendly polymer material, in particular to a method for preparing nonionic water-based polyurethane without solvent. Background technique [0002] Waterborne polyurethane is a binary colloidal system in which water is used as the dispersion medium and polyurethane is used as the dispersion. Waterborne polyurethane has the characteristics of non-toxic and green, and has become a hot spot in the field of polyurethane research, with good technical prospects and application value. The preparation methods of waterborne polyurethane are generally divided into external emulsification and self-emulsification. At present, the preparation of water-based polyurethane mostly adopts the self-emulsification dispersion method, that is, introducing an appropriate amount of hydrophilic groups into the polymer chain, and spontaneously disperses to form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/28C08G18/12
CPCC08G18/12C08G18/283C08G18/3206C08G18/4018C08G18/4238C08G18/4812C08G18/4854C08G18/6607C08G18/42C08G18/48
Inventor 李仙会李想
Owner 上海材料研究所靖江先进材料技术研究院
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