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Preparation method of solvent-free waterborne polyurethane resin with anionic and non-ionic characteristics

A water-based polyurethane and non-ionic technology, which is applied in the field of leather product processing, can solve the problems that the viscosity is also greatly affected, and the polyurethane strength is greatly affected, so as to achieve low viscosity, good low PH value stability and electrolyte stability, and reduce winding Effect

Inactive Publication Date: 2017-12-29
DYMATIC CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of segment is synthesized on the main chain, which has a great influence on the strength of polyurethane and has a great influence on the viscosity during the synthesis process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 100 parts of polyneopentyl adipate diol (number average molecular weight 2000) and 40 parts of isophorone diisocyanate into the reaction vessel, and under continuous stirring and nitrogen atmosphere, the temperature is raised to 80-90 ℃ for 2 hours;

[0027] (2) Cool the above reaction system to 80-85℃, add 15 parts of Ymer N120 monomer, 5 parts of dimethylolpropionic acid, and maintain the temperature at 80-85℃ to react for 4-6 hours to obtain -NCO-terminated polyurethane Prepolymer

[0028] (3) Cool down to 55-60℃, add 3.7 parts of triethylamine to the above-NCO-terminated polyurethane prepolymer, stir for 30 minutes, then add 370 parts of deionized water and 4.5 ethylenediamine under high-speed shearing conditions After stirring for 60 minutes, a stable polyurethane emulsion is obtained, which is the solvent-free diionic waterborne polyurethane resin.

Embodiment 2

[0030] (1) Add 100 parts of polyoxypropylene glycol (number-average molecular weight 2000) and 50 parts of 4,4'-dicyclohexylmethane diisocyanate into the reaction vessel. Under continuous stirring and nitrogen atmosphere, the temperature is increased to 80-90°C Reaction for 2 hours;

[0031] (2) Cool the above reaction system to 80-85℃, add 20 parts of Ymer N120 monomer, 5 parts of dimethylolpropionic acid, and maintain the temperature at 80-85℃ to react for 4-6 hours to obtain -NCO-terminated polyurethane Prepolymer

[0032] (3) Cool down to 55-60℃, add 3.7 parts of triethylamine to the above-NCO-terminated polyurethane prepolymer, stir for 30 minutes, then add 390 parts of deionized water and ethylenediamine 4 under high-speed shearing conditions After stirring for 60 minutes, a stable polyurethane emulsion is obtained, which is the solvent-free diionic waterborne polyurethane resin.

Embodiment 3

[0034] (1) Add 100 parts of polytetrahydrofurandiol (number-average molecular weight 1000) and 40 parts of 4,4'-dicyclohexylmethane diisocyanate into the reaction vessel. Under continuous stirring and nitrogen atmosphere protection, the temperature is raised to 80-90°C for reaction 2 hours;

[0035] (2) Cool the above reaction system to 80-85℃, add 18 parts of Ymer N120 monomer, 4 parts of dimethylolpropionic acid, and maintain the temperature at 80-85℃ to react for 4-6 hours to obtain -NCO-terminated polyurethane Prepolymer

[0036] (3) Cool down to 55-60℃, add 3 parts of triethylamine to the above-NCO-terminated polyurethane prepolymer, stir for 30 minutes, then add 360 parts of deionized water and ethylenediamine 3 under high-speed shearing conditions After stirring for 60 minutes, a stable polyurethane emulsion is obtained, which is the solvent-free diionic waterborne polyurethane resin.

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Abstract

The invention discloses a preparation method of solvent-free waterborne polyurethane resin with anionic and non-ionic characteristics. Polyester diol or polyether diol reacts with aliphatic isocyanate, two hydrophilic components including a T-type non-ionic dihydric alcohol monomer and a carboxyl-containing anionic dihydric alcohol monomer are introduced, the introduced groups are neutralized and then dispersed and emulsified with water, a chain extension reaction is performed with polyamine, and the solvent-free waterborne polyurethane resin with anionic and non-ionic characteristics is obtained. The synthesized resin has the characteristics of anionic and non-ionic waterborne polyurethane, and the defect that anionic waterborne polyurethane is sensitive to low PH values and electrolytes can be overcome. The solvent-free waterborne polyurethane resin with the anionic and non-ionic characteristics has great application significance in leather product treating fluids with low PH values and high electrolyte content.

Description

Technical field [0001] The invention relates to a method for preparing a solvent-free waterborne polyurethane resin with anionic and nonionic characteristics, which is mainly used in the field of leather product processing. Background technique [0002] As people’s awareness of environmental protection and safety has increased, environmental regulations have become increasingly stringent. Many customers require the use of low-VOC or even zero-VOC water-based chemicals in the leather industry. In traditional waterborne polyurethane, solvents such as DMF, NMP, acetone and other solvents are used for prepolymer synthesis. These solvents will partially remain on the leather and form the source of slow VOC release in the future. Therefore, there are more and more researches on the development and application of solvent-free waterborne polyurethane, and the market demand potential is huge. At the same time, the styles of leather on the market are diverse, and the chemicals used are al...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12
Inventor 梁永标鲍亮李成祥杨成华郭玉良
Owner DYMATIC CHEM
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