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A kind of 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 of loss of mechanical properties, poor shape stability, poor oxidation resistance and hydrolysis resistance, etc., and achieve the effect of reducing heavy dependence and excellent hydrolysis resistance

Active Publication Date: 2021-05-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the invention patents disclosed above that cationic waterborne polyurethane needs to use more than 6wt% of hydrophilic chain extender, so the use of a large amount of hydrophilic chain extender makes the water resistance, oxidation resistance and property of cationic waterborne polyurethane film poor Poor resistance to hydrolysis, poor shape stability, resulting in loss of mechanical properties

Method used

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  • A kind of cationic waterborne polyurethane resin and preparation method thereof
  • A kind of cationic waterborne polyurethane resin and preparation method thereof
  • A kind of cationic waterborne polyurethane resin and preparation method thereof

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preparation example Construction

[0041] The invention provides a kind of preparation method of cationic waterborne polyurethane resin, comprising:

[0042] A) mixing poly(carbonate-ether) glycol, diisocyanate with small molecule chain extender, catalyst and solvent, and reacting to obtain the first intermediate;

[0043] B) mixing the first intermediate with a hydrophilic chain extender, a catalyst and a solvent, and reacting to obtain a second intermediate;

[0044] C) neutralizing the second intermediate and the neutralizing agent to obtain a cationic waterborne polyurethane resin.

[0045]The preparation method of a cationic water-based polyurethane resin provided by the present invention firstly mixes poly(carbonate-ether) glycol, diisocyanate, small molecule chain extender, catalyst and solvent, and reacts to obtain the first intermediate.

[0046] The present invention has no limitation on the source of the poly(carbonate-ether) glycol used, and it is preferably prepared according to the method disclos...

Embodiment 1

[0064] According to the method disclosed in the patent 201210086834.X, a poly(carbonate-ether) glycol with a number average molecular weight of 2100 g / mol and a carbonate unit content of 50% was prepared.

[0065] Add 100 grams of poly(carbonate-ether) glycol prepared by the above method to a three-necked flask, heat to 100°C, dehydrate at -0.98MPa for 1 hour, cool to 80°C, and add 44 grams of iso Phorone diisocyanate, 12.7 grams of butanediol and 100 grams of methyl ethyl ketone were reacted for 4 hours, and then 1.6 grams of 3-dimethylamino-1,2-propanediol, 0.09 grams of dibutyltin dilaurate catalyst and 20 grams of butanone, reacted for 2 hours, cooled to 30 ° C, added 0.8 grams of acetic acid, reacted for 2 hours, then added 200 grams of deionized water, stirred at 1800 rpm for 2 hours, and distilled off butanone under reduced pressure to obtain a cation Waterborne polyurethane resin. The performance data of the cationic waterborne polyurethane resin prepared in Example 1...

Embodiment 2

[0067] According to the method disclosed in the patent 201210086834.X, a poly(carbonate-ether) glycol with a number average molecular weight of 2100 g / mol and a carbonate unit content of 50% was prepared.

[0068] Add 100 grams of poly(carbonate-ether) glycol prepared by the above method to a three-necked flask, heat to 100°C, dehydrate at -0.98MPa for 1 hour, cool to 80°C, and add 44 grams of iso Phorone diisocyanate, 11.5 grams of butanediol and 100 grams of methyl ethyl ketone were reacted for 4 hours, and then 3.2 grams of 3-dimethylamino-1,2-propanediol, 0.09 grams of dibutyltin dilaurate catalyst and 20 grams of butanone, reacted for 2.5 hours, cooled to 30 ° C, added 1.6 grams of acetic acid, reacted for 1.5 hours, then added 200 grams of deionized water, stirred at 1600 rpm for 2 hours, and distilled off butanone under reduced pressure to obtain a cation Waterborne polyurethane resin. The performance data of the cationic waterborne polyurethane resin prepared in Examp...

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Abstract

The present invention provides a kind of cationic aqueous polyurethane resin shown in formula (I), wherein, R 1 is formula a-1 or formula a-2; R 2 One of chlorine, carboxyl, acetate, and propionate; R 3 It is one or more of the formulas c-1 ~ formula c-5, R 4 It is a structure of formula d, wherein, m and n are the degree of polymerization, 5≤m≤40, 10≤n≤100; R 5 It is a C4-C6 alkyl group. The poly(carbonate-ether) glycol in the main chain structure of the present invention and the ether bond structure provide excellent anti-aging properties such as hydrolysis resistance and oxidation resistance; and the poly(carbonate-ether) binary The alcohol structure comes from carbon dioxide raw materials, which reduces the heavy dependence on petrochemical resources and has a sustainable development strategy.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a cationic waterborne polyurethane resin and a preparation method thereof. Background technique [0002] Polyurethane is widely used in coatings, adhesives, sealants, elastomers, foams, etc. because of its excellent performance, various forms, and simple molding and processing. It is known as the "fifth largest plastic". However, as people pay more and more attention to environmental protection and health issues, the restrictions on volatile organic compounds are becoming increasingly strict, and water-based polyurethane with water as the dispersion medium has gradually become the development trend in this field. Waterborne polyurethane is a type of binary colloid system formed by dispersing polyurethane emulsion droplets in water. It can be stably dispersed in water by introducing ionic groups or hydrophilic non-ionic polyether segments, mainly including cations, anions and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/44C08G18/32C08G18/12C08G18/08
CPCC08G18/0814C08G18/12C08G18/3206C08G18/44C08G18/48C08G18/664C08G18/6674C08G18/722C08G18/724C08G18/73C08G18/755C08G18/758C08G18/7614C08G18/7671C08G18/3275
Inventor 巩如楠张红明乔立军王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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