Glycine betaine group modified cationic waterborne polyurethane and preparation method thereof

A water-based polyurethane and cationic technology, which is applied in the field of betaine group-modified cationic water-based polyurethane and its preparation, can solve the problems of being unable to adapt to the processing and use of various fields

Inactive Publication Date: 2013-02-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing water-based polyurethane containing a betaine structure in the molecular chain, to overcome the disadvantages that the prior art has certain application limitations and cannot adapt to the processing and use of various fields

Method used

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  • Glycine betaine group modified cationic waterborne polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Add 2.5mol of toluene diisocyanate (435g) and 1mol of polycaprolactone diol (2000g) with a molecular weight of 2000 to a reactor equipped with a stirrer, reflux condenser, nitrogen protection, and temperature indication, and add 12g of organic bismuth catalyst was reacted at 80°C for 1.5h to obtain product A;

[0018] (2) Dissolve 97g (4%) of N-methyldiethanolamine in acetone, slowly add it into the reactor at 40°C, keep the temperature at 70°C for 1 hour after the dropwise addition, and obtain product B;

[0019] (3) Dissolve 20g of 1,3-propane sultone in acetone, add slowly at 40°C, keep the reaction temperature for 2 hours, and obtain product C;

[0020] (4) Weigh 98g of acetic acid, add it to the product C and stir evenly, then disperse the product C in 5100g of deionized water under high-speed stirring conditions, and finally remove the co-solvent by distillation under reduced pressure to obtain a sugar beet of the present invention Alkali group modified catio...

Embodiment 2

[0022] (1) Add 2mol of 4,4-diphenylmethane diisocyanate (500g) and 1mol of polytetrahydrofuran diol (2000g) with a molecular weight of 2000 into a reactor equipped with a stirrer, reflux condenser, nitrogen protection, and temperature indication , add 12.5g of organic bismuth catalyst, react at 70°C for 1h, and obtain product A;

[0023] (2) Dissolve 75g (3%) of N-methyldiethanolamine in butanone, slowly add it into the reactor at 45°C, keep the temperature at 60°C for 1h after the dropwise addition, and obtain product B;

[0024] (3) Dissolve 7.7g of 1,3-propane sultone in butanone, add slowly at 45°C, keep the reaction temperature for 1 hour, and obtain product C;

[0025] (4) Weigh 114g of acetic acid, add it to the product C and stir evenly, then disperse the product C in 5100g of deionized water under high-speed stirring conditions, and finally remove the cosolvent by distillation under reduced pressure to obtain a sugar beet of the present invention Alkali group modifie...

Embodiment 3

[0027] (1) Add 3mol of 1,6-hexyl diisocyanate (505g) and 1mol of polyoxypropylene diol (1000g) with a molecular weight of 1000 into a reactor equipped with a stirrer, reflux condenser, nitrogen protection, and temperature indication , adding 7.5g of organic bismuth catalyst, reacting at 90°C for 2h to obtain product A;

[0028] (2) Dissolve 75g (5%) of N-methyldiethanolamine in 50g of acetone solution, slowly add it into the reactor at 50°C, keep the temperature at 50°C for 1h after the dropwise addition, and obtain product B

[0029] (3) Dissolve 30g of 1,3-propane sultone in acetone, add it slowly at 50°C, keep the reaction temperature for 3 hours, and obtain product C;

[0030] (4) Weigh 38g of acetic acid, add it to the product C and stir evenly, then disperse the product C in 3200g of deionized water under high-speed stirring conditions, and finally remove the co-solvent by distillation under reduced pressure to obtain a sugar beet of the present invention Alkali group m...

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Abstract

The invention belongs to the field of waterborne polyurethane synthesis, and particularly relates to glycine betaine group modified cationic waterborne polyurethane and a preparation method thereof. The prior art has a certain application limitation and cannot be used for processing in various fields. In order to overcome the shortcomings, the technical scheme includes that a sulfonic acid type glycine betaine structure contains a cationic tertiary amine group and an anionic sulfonic acid group, the groups are led into a polyurethane molecular structure, dispersing and emulsifying properties of the polyurethane can be improved, emulsion particle diameters are smaller, stability of pH (potential of hydrogen), metal ions and the like of polyurethane emulsion is improved, and the applicable range of the polyurethane is widened. As a molecular chain contains the anionic group and the cationic group, acting force among molecules after films are formed on resin is higher, cohesive force is higher, the resin can achieve better mechanical property and adhesive strength, and the shortcomings of traditional waterborne resin in terms of mechanical property, adhesive strength and initial adhesiveness are greatly overcome.

Description

technical field [0001] The invention belongs to the field of water-based polyurethane synthesis, and in particular relates to a betaine group-modified cationic water-based polyurethane and a preparation method thereof. Background technique [0002] Waterborne polyurethane resins can be divided into three types: anionic, cationic, and nonionic according to the type of hydrophilic group contained. At present, the most widely studied water-based polyurethane is anionic water-based polyurethane, a water-based polyurethane resin synthesized with carboxylic acid or sulfonic acid groups as hydrophilic groups, which have been used as water-based coatings, adhesives, textile coatings, leather, etc. Finishing, etc. are used in the processing field. However, as anionic waterborne polyurethane, different hydrophilic groups will have a huge impact on its structural properties. The water-based polyurethane resin synthesized with carboxylic acid-type hydrophilic chain extender has low so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/66C08G18/42C08G18/44C08G18/48C08G18/32
Inventor 张哲王学川强涛涛任龙芳
Owner SHAANXI UNIV OF SCI & TECH
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