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Epoxy modified anionic/nonionic waterborne polyurethane resin and preparation method thereof

A water-based polyurethane and epoxy modification technology, applied in polyurea/polyurethane coatings, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., can solve modification Problems such as poor stability of water-based polyurethane dispersions, to achieve excellent stability, excellent water resistance, and enhanced cohesive energy

Active Publication Date: 2017-03-15
GUANGZHOU HUMAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings and deficiencies of the poor stability of the above-mentioned prior art epoxy resin modified waterborne polyurethane dispersion, the primary purpose of the present invention is to provide a kind of preparation method of epoxy modified anion / nonionic waterborne polyurethane resin

Method used

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  • Epoxy modified anionic/nonionic waterborne polyurethane resin and preparation method thereof
  • Epoxy modified anionic/nonionic waterborne polyurethane resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In a four-neck flask equipped with an electric stirrer, a reflux condenser, and a mercury thermometer, add 200 g of polytetrahydrofuran ether glycol (PTMG) with a molecular weight of 2000, dehydrate in vacuum at 120°C for 2 hours, cool down to 70°C, and add iso Fluorone diisocyanate (IPDI) 111.15g and catalyst dibutyltin dilaurate (DBTDL) 0.10g were reacted at 90°C for 1-2 hours to obtain a primary polymer. After cooling down to 70°C, add 9.6g of 1,4-butanediol (BDO), 17.0g of dimethylolpropionic acid (DMPA), 30.0g of N-methylpyrrolidone (NMP) and 50.0g of acetone, and keep warm for 3.0 ~4.0h, after NCO was titrated to the end point by di-n-butylamine method, the temperature of the system was lowered to 50°C, and 12.83g of triethylamine (TEA) and 50.0g of acetone were added to neutralize and form a salt. The prepolymer obtained after neutralization was shear dispersed into 620.0g deionized water at 2000rpm for emulsification for about 10min, then 8.0g of ethylenediamine...

Embodiment 2

[0046] In a four-neck flask equipped with an electric stirrer, a reflux condenser, and a mercury thermometer, add 200 g of polytetrahydrofuran ether glycol (PTMG) with a molecular weight of 2000, dehydrate in vacuum at 120°C for 2 hours, cool down to 70°C, and add iso Fluorone diisocyanate (IPDI) 111.15g and catalyst dibutyltin dilaurate (DBTDL) 0.10g were reacted at 90°C for 1-2 hours to obtain a primary polymer. After cooling down to 70°C, add 1,4-butanediol (BDO) 8.34g, dimethylolpropionic acid (DMPA) 17.0g, epoxy resin (E-20) 14.0g, N-methylpyrrolidone (NMP ) 30.0g and acetone 50.0g, keep warm for 3.0-4.0h, titrate NCO to the end point with di-n-butylamine method, cool down the system to 50°C, add 12.83g triethylamine (TEA) and 50.0g acetone to neutralize and form a salt . The prepolymer obtained after neutralization was shear dispersed into 648.0g deionized water at 2000rpm for emulsification for about 10min, then 8.0g of ethylenediamine was added for chain extension for...

Embodiment 3

[0048] In a four-neck flask equipped with an electric stirrer, a reflux condenser, and a mercury thermometer, add 200 g of polytetrahydrofuran ether glycol (PTMG) with a molecular weight of 2000, dehydrate in vacuum at 120°C for 2 hours, cool down to 70°C, and add iso Fluorone diisocyanate (IPDI) 111.15g and catalyst dibutyltin dilaurate (DBTDL) 0.10g were reacted at 90°C for 1-2 hours to obtain a primary polymer. After cooling down to 70°C, add 1,4-butanediol (BDO) 6.82g, dimethylol propionic acid (DMPA) 17.0g, epoxy resin (E-44) 14.0g, N-methylpyrrolidone (NMP ) 30.0g and acetone 50.0g, keep warm for 3.0-4.0h, titrate NCO to the end point with di-n-butylamine method, cool down the system to 50°C, add 12.83g triethylamine (TEA) and 50.0g acetone to neutralize and form a salt . The prepolymer obtained after neutralization was shear dispersed into 645.0g deionized water at 2000rpm for emulsification for about 10min, then 8.0g of ethylenediamine was added to extend the chain fo...

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Abstract

The invention relates to the technical field of preparation of modified waterborne polyurethane, in particular to epoxy modified anionic / nonionic waterborne polyurethane resin and a preparation method thereof. The preparation method comprises the steps: mixing a macromolecular polyol and a nonionic hydrophilic chain extender, heating to 70-80 DEG C, adding diisocyanate and a catalyst, and holding the temperature and stirring for reaction for 1 to 3 h to obtain a prepolymer; adding an anionic hydrophilic chain extender and a macromolecular polyol, stirring for reaction at 60 to 70 DEG C for 1 to 3 h to obtain a hydrophilic chain extender prepolymer; adding epoxy resin solution, stirring for reaction at 60 to 70 DEG C for 2 to 4 h to obtain epoxy modified prepolymer; cooling, and adding a salt agent to form a salt by neutralizing; adding water for emulsifying; adding polyamine for reaction for 10 to 60 min to obtain the epoxy modified anionic / nonionic waterborne polyurethane resin which has excellent resistance to hydrolysis and resistance to low temperature, high film strength, and excellent mechanical properties, and can be used as a leather finishing agent.

Description

technical field [0001] The invention belongs to the technical field of preparation of modified water-based polyurethane resins, in particular to an epoxy-modified anion / nonionic water-based polyurethane resin and a preparation method thereof. Background technique [0002] Polyurethane is a new class of synthetic polymers developed in the 1940s. Its molecular backbone contains many repeating carbamate (-NH-COO-) segments. Polyurethane is known as the resin with the best performance. It can bring many excellent properties when used in coatings, such as hardness, flexibility, wear resistance, chemical resistance, strong adhesion, low film forming temperature, and room temperature curing. However, the traditional solvent-based polyurethane synthesis process requires the use of a large amount of organic solvents, and the prepared coatings also need to be diluted with a lot of organic solvents during construction and application. Therefore, polyurethane coatings will release a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/12C08G18/48C08G18/58C08G18/65C08G18/66C08G18/32C08G18/34C09D175/08C14C11/00
CPCC08G18/10C08G18/12C08G18/4045C08G18/4808C08G18/4812C08G18/4833C08G18/4854C08G18/58C08G18/6511C08G18/6529C08G18/6541C08G18/6674C08G18/6685C08G18/6692C09D175/08C14C11/006C08G18/3206C08G18/348C08G18/3228
Inventor 陈广祥唐渝黄光燕
Owner GUANGZHOU HUMAN CHEM
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