Cationic waterborne polyurethane resin and preparation method thereof

A water-based polyurethane and cationic technology, applied in the field of polyurethane, can solve the problems that water-based polyurethane emulsion cannot get rid of the dependence on petrochemical resources, complex process polyester diol, etc.

Active Publication Date: 2016-05-25
中科应化(长春)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing cationic water-based polyurethane preparation method is complex, the polyester diols used are all derived from petrochemical

Method used

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  • Cationic waterborne polyurethane resin and preparation method thereof
  • Cationic waterborne polyurethane resin and preparation method thereof
  • Cationic waterborne polyurethane resin and preparation method thereof

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preparation example Construction

[0046] Correspondingly, the present invention also provides a kind of preparation method of cationic waterborne polyurethane resin, comprises the following steps:

[0047] Step 1: under the protection of an inert gas, poly(carbonate-ether) glycol and diisocyanate are reacted in an organic solvent to obtain a first intermediate;

[0048] Step 2: reacting the first intermediate obtained in step 1 with the hydrophilic chain extender under the action of a catalyst to obtain the second intermediate;

[0049] Step 3: react the second intermediate obtained in Step 2 with butanediol, add acid for neutralization, add deionized water to emulsify and evaporate the solvent to obtain a cationic water-based polyurethane resin.

[0050] According to the present invention, under the protection of an inert gas, poly(carbonate-ether) glycol and diisocyanate are reacted in an organic solvent to obtain the first intermediate; the present invention has no special restrictions on the inert gas, pre...

Embodiment 1

[0063] According to the method disclosed in Example 11 of patent 201210086834.X, a poly(carbonate-ether) glycol with a number average molecular weight of 1500 Daltons was prepared.

[0064] Add 100 grams of prepared poly(carbonate-ether) glycol with a molecular weight of 1500 Daltons into the three-necked flask, heat to 110°C, dehydrate at -0.98MPa for 1 hour, cool down to 75°C, and protect it under nitrogen , add 170 grams of methyl ethyl ketone and 57 grams of xylene methane diisocyanate, react for 2 hours, then cool down to 30 degrees, dropwise add 0.0015 grams of dibutyltin dilaurate catalyst, add 8 grams of N-methyldiethanolamine in three batches, add After completion, react for 1 hour, then heat up to 70°C, add 3.8 grams of butanediol, react for 2 hours, add glacial acetic acid to neutralize the pH to 7, then add 140 grams of deionized water, stir at 1200 rpm for 1 hour, and remove butanone under reduced pressure , to obtain a cationic waterborne polyurethane resin. The...

Embodiment 2

[0069] According to the method disclosed in Example 8 of the patent 201210086834.X, a poly(carbonate-ether) glycol with a number average molecular weight of 2800 Daltons was prepared.

[0070] Add 180 grams of prepared poly(carbonate-ether) glycol with a molecular weight of 2800 Daltons into the three-necked flask, heat to 100°C, dehydrate at -0.98MPa for 2 hours, cool down to 72°C, and protect it under nitrogen , add 250 grams of butanone and 40 grams of toluene diisocyanate, react for 1.5 hours, then cool down to 30 degrees, add 0.0016 grams of dibutyltin dilaurate catalyst dropwise, add 8.5 grams of N-methyldiethanolamine in three batches, after the addition is complete React for 1 hour, then heat up to 65°C, add 4.3 grams of butanediol, react for 2 hours, add concentrated hydrochloric acid to neutralize the pH to 7, then add 250 grams of deionized water, stir at 1500 rpm for 2 hours, and remove butanone under reduced pressure, that is A cationic waterborne polyurethane res...

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Abstract

The invention discloses cationic waterborne polyurethane and a preparation method thereof, and relates to the technical field of polyurethane. The problems that an existing cationic waterborne polyurethane preparation method is complex in technology, and prepared waterborne polyurethane emulsion cannot get rid of the dependency on petrochemical resources are solved. The structural formula of the cationic waterborne polyurethane is shown as a formula (1) (please see the formula in the description). The invention further provides a preparation method of cationic waterborne polyurethane resin. The preparation method comprises the steps that firstly, under protection of inert gas, poly(carbonic ester-ether)dihydric alcohol reacts with diisocyanate in organic solvent to obtain a first intermediate; secondly, the first intermediate reacts with a hydrophilic chain extender under action of a catalyst to obtain a second intermediate; lastly, the second intermediate reacts with butanediol, acid is added for neutralization, deionized water is added to remove the solvent through emulsifying and steaming, and then the cationic waterborne polyurethane resin is obtained. The polyurethane resin is excellent in performance, and waterborne polyurethane can reduce the dependency on the petrochemical resources.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a cationic water-based polyurethane and a preparation method thereof. Background technique [0002] Polyurethane is widely used in leather finishing, coatings, adhesives and other fields due to its advantages such as wide range of softness and hardness, low temperature resistance, good flexibility and strong adhesion. However, with the promulgation of environmental safety laws and regulations in various countries, many countries have restricted the application of solvent-based polyurethane. [0003] Since the continuous phase of water-based polyurethane is water, it is safe and easy to store and store, and it is convenient to use and low in cost. It is superior to solvent-based polyurethane in some properties, so the research and production of water-based polyurethane has been paid attention to by countries all over the world, and has made great progress. In the preparatio...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/44C08G18/32C08G18/10C08G18/08
CPCC08G18/0814C08G18/10C08G18/3275C08G18/44C08G18/4825C08G18/6655C08G18/6688C08G18/3206
Inventor 李颖张红明苗宇阳乔立军王献红王佛松
Owner 中科应化(长春)科技有限公司
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