Cationic polyurethane-polyurea water dispersion, and preparation method and application thereof

A cationic, polyurethane technology, used in polyurea/polyurethane coatings, coatings, etc., to solve problems such as film formation and stickiness

Active Publication Date: 2019-07-02
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves several problems existing in cationic waterborne polyurethane: (1) cannot use amine chain extension in water phase; (2) avoids the catalytic effect on the reaction system when N-alkyldiethanolamine is used as hydrophilic chain extender
(3) Solve the problem of sticky film formation

Method used

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  • Cationic polyurethane-polyurea water dispersion, and preparation method and application thereof
  • Cationic polyurethane-polyurea water dispersion, and preparation method and application thereof
  • Cationic polyurethane-polyurea water dispersion, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Add 276g of dehydrated polyester polyol II (component b), 57.6g of polyisocyanate I (component c), 1.8g of dehydrated Ymer 120 (component d), 40g of acetone into a nitrogen inlet and outlet In a 1 L four-neck round bottom flask, the mixture was stirred at 60-90°C until -NCO reached 1.80 wt%. Add 460g of acetone to dilute and lower the temperature to below 40°C and add 7.0g of N,N-bis(3-aminopropyl)methylamine (component a) diluted 5 times with acetone to react for about 15min, then add 2.9g of acetic acid (component a) Part e) Neutralize for about 5 minutes, add 1.6g of composite antioxidant (component i) and stir evenly, add 676g of deionized water under rapid stirring to disperse. A solvent-free cationic polyurethane-polyurea dispersion is obtained after separation of the acetone by distillation. It has a solids content of 38 wt%, an average particle size of 130 nm, and a pH of 4.5. The mass fraction of N atoms playing a hydrophilic role is 0.198wt% (based on solid ...

Embodiment 2

[0081] Add 200g of dehydrated polyester polyol I (component b), 105g of polyisocyanate I (component c), 4.0g of dehydrated MPEG-1200 (component d), 31g of acetone into a nitrogen inlet and outlet In a 1L four-neck round bottom flask, stir the mixture at 60-90°C until -NCO reaches 6.56wt%, then cool down to 40-50°C and add 12.6g of 1,2-propanediol (component f) and 32g of acetone to continue the reaction Until -NCO reaches 2.55wt%, add 436g of acetone to dilute and lower the temperature to below 40°C, add 6.5g of N,N-bis(3-aminopropyl)methylamine (component a) diluted 5 times with acetone under rapid stirring and 5g of isophorone diamine (component g), reacted for about 15min, then added 2.69g of acetic acid (component e) for neutralization for about 5min, added 1.68g of composite antioxidant (component i) and stirred evenly, under rapid stirring Add 499 g of deionized water to disperse. A solvent-free cationic polyurethane-polyurea dispersion is obtained after separation of t...

Embodiment 3

[0083] Add 250g of dehydrated polyether polyol I (component b), 65g of polyisocyanate II (component c), 4.0g of dehydrated MPEG-1200 (component d), 31.9g of acetone into a nitrogen inlet In the outlet 1L four-neck round bottom flask, stir the mixture at 60-90°C until -NCO reaches 5.91%, cool down to 40-50°C, add 14.0g of 1,2-propylene glycol (component f) and 33g of acetone to continue the reaction Until -NCO reaches 1.32%, add 444g of acetone to dilute and lower the temperature to below 40°C, add 7.5g of N,N-dimethyldipropylenetriamine (component a) diluted 5 times with acetone under rapid stirring, and react for about 15min , then add 2.69g of acetic acid (component e) for neutralization for about 5min, add 1.8g of composite antioxidant (component i) and stir evenly, and add 523g of deionized water under rapid stirring to disperse. A solvent-free cationic polyurethane-polyurea dispersion is obtained after separation of the acetone by distillation. It has a solids content of...

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Abstract

The invention provides a cationic polyurethane-polyurea water dispersion, and a preparation method and application thereof. The dispersion is mainly prepared from the following raw materials: a) at least one polyamine containing tertiary amino groups, wherein the polyamine containing the tertiary amino groups at least contains two functional groups with reactivity with -NCO, and the functional groups are selected from primary amino groups and / or secondary amino groups; b) at least one polyhydric alcohol with functionality of 2-4 and with a number-average molecular weight of from 500 g / mol to 15000 g / mol; c) at least one polyisocyanate component; d) at least one nonionic polyhydric alcohol which is different from the component b) and has a number-average molecular weight of from 500 g / mol to 10000 g / mol; e) at least one neutralizer; and optionally other components. The invention provides the cationic polyurethane-polyurea water dispersion which is simple to operate and easy to control and has improved film-forming performance, heat resistance and yellowing resistance.

Description

technical field [0001] The invention relates to a cationic polyurethane-polyurea water dispersion and its preparation method and application. The dispersion uses an ionizable polyamine containing tertiary amine groups as a hydrophilic chain extender for chain extension, and obtains a polyurethane-polyurea aqueous dispersion with a number average molecular weight of more than 150,000 g / mol. The reaction process is simple and safe. Background technique [0002] As a new type of material, polyurethane-polyurea aqueous dispersion is non-flammable, non-toxic and non-polluting, and is widely used in coatings, adhesives, textiles and other fields. The hydrophilicity of the self-emulsifying polyurethane-polyurea aqueous dispersion is obtained by introducing a segment with a hydrophilic function into the polyurethane main chain, and is divided into anionic, cationic and nonionic according to the nature of the hydrophilic group type. At present, the most researched and most widely ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/48C08G18/44C08G18/10C09D175/06C09D175/02C09D175/08C09D175/04
CPCC08G18/10C08G18/2835C08G18/4018C08G18/4211C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4854C09D175/02C09D175/04C09D175/06C09D175/08C08G18/3228C08G18/3206C08G18/3234
Inventor 纪学顺王震朱文辉赵鹏伟晋云全刘云玲邓俊英孙家宽
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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