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Waterborne polyurethane dispersion liquid serving as high-molecular material, and preparation method thereof

A technology of polyurethane dispersion and water-based polyurethane, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, applications, etc., can solve problems such as poor film formation, lower viscosity, time-consuming and energy-consuming

Inactive Publication Date: 2014-02-26
SHANGHAI XINGUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this patent are: (1) the synthesized polyurethane polymer uses a large amount of acetone to reduce the viscosity, and then disperses into water
(2) Distilling acetone from the product under reduced pressure and recovering acetone is time-consuming and energy-consuming, and the finished product still contains organic solvents, which still has an impact on the environment
(3) The products Dispercoll U-53 and U-54 produced by this patent have poor film-forming properties and cracks, so they are not suitable for coatings and inks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a stripped reactor equipped with stirrer, condenser, dropping funnel, thermometer and calcium chloride drier tube, 215 g of polyester diol (composed of 1,6-hexanediol, 1,4-butanediol and Prepared by adipic acid, the molecular weight is 2000) and 19.1g HDI, 18.5g IPDI and 72.7g TMXDI, react at 50-100°C for 1-2 hours, then add 1.5g 1,4-butanediol and 17.2g DMPA to continue the reaction for 0.5- After 1.5 hours, neutralize with 10.4g TEA, keep warm at 70-80°C for 1 hour, disperse in 520g deionized water under rapid stirring, add 13g EDA to extend the chain within 15 minutes, and continue stirring for about 2 hours to obtain a stable milky white Aqueous polyurethane dispersion. Its properties are as follows:

[0034] Solid content: 40.5%

[0035] pH: 8.5

[0036] Viscosity: 80mPa.s

[0037] PVC / PVC peel strength is 4~6kg / cm.

[0038] The water-based polyurethane dispersion product has excellent adhesive properties, film-forming properties and good miscibility with a...

Embodiment 2

[0040] In the same reactor as in Implementation 1, 248g of polyether diol (polypropylene oxide diol, molecular weight 2000) and 127.6g of TMXDI, 21.4g of TDI, 49.28g of IPDI were reacted at 50-100°C for 1-2 hours, and then added Continue to react 3.3g of 1,4-butanediol and 24.9g of DMPA for 0.5-1.5 hours, neutralize with 16.9g of TEA, keep warm at 70-80°C for 1 hour, disperse in 860g of deionized water under rapid stirring, add 36g of EDA chain extension, continue stirring for about 2 hours to obtain a stable translucent water-based polyurethane dispersion. Its properties are as follows:

[0041] Solid content: 36.5%

[0042] pH: 8.9

[0043] Viscosity: 100mPa.s

[0044] PVC / PVC peel strength is 4~6kg / cm.

[0045] The water-based polyurethane dispersion product has excellent adhesive properties, film-forming properties and good miscibility with acrylic resins. Widely used in the fields of adhesives, coatings and water-based inks.

Embodiment 3

[0047] In the same reactor as implementation 1, 276g polyether diol (polypropylene oxide diol, molecular weight 2000), 50g polyethylene glycol (Ymer N120, molecular weight 1000) and 67.2g TMXDI, 30.7g HDI, 17.6g IPDI React at 50-100°C for 1-2 hours, then add 3.1g of 1,4-butanediol and 36g of DMPA to continue the reaction for 0.5-1.5 hours, neutralize with 27g of TEA, keep warm at 70-80°C for 1 hour, and disperse in Add 504g of EDA to 550g of deionized water for chain extension within 15 minutes, and continue to stir for about 2 hours to obtain a stable translucent water-based polyurethane dispersion. Its properties are as follows:

[0048] Solid content: 45.2%

[0049] pH: 7.3

[0050] Viscosity: 60mPa.s.

[0051] PVC / PVC peel strength is 4~6kg / cm.

[0052]The water-based polyurethane dispersion product has excellent adhesive properties, film-forming properties and good miscibility with acrylic resins. Widely used in the fields of adhesives, coatings and water-based inks....

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Abstract

The invention relates to a waterborne polyurethane dispersion liquid serving as a high-molecular material. A preparation method comprises the steps of: according to the mole ratio of polyols to isocyanate being 1:(1-5), complexing polyester polyol and polyether polyol with an isocyarnate mixture containing tetramethylbenzene dimethyl diisocyanate, 1,6-hexon diisocyanate and other polyisocyanate, reacting for 1-2 hours at 50-100DEG C to obtain a prepolymer, then adding micromolecular alcohol and hydrophilic group-containing dimethylolpropionic acid, reacting for 0.5-1.5 hours, neutralizing with triethylamine, preserving heat for one hour at 70-80DEG C, dispersing into water, adding an amine chain extender to obtain a waterborne dispersion body. For the waterborne polyurethane dispersion liquid, the solid content is 35%-45%, PH is 7.0-8.5, the viscosity is 30-100mpa.s, and the PVC (Polyvinyl Chloride) / PVC speeling strength is 4-6kg / cm. The waterborne polyurethane dispersion liquid product has excellent binding property, film forming performance and excellent mixing property with acrylic resin. The waterborne polyurethane dispersion liquid is widely applied in the fields of a binding agent, paint and waterborne ink.

Description

technical field [0001] The invention relates to a water-based polyurethane dispersion used as a polymer material, in particular to a preparation method of a solvent-free water-based polyurethane dispersion used for adhesives, coatings and printing inks. Background technique [0002] In recent years, with the strengthening of people's awareness of environmental protection and environmental protection regulations, water-based polyurethane dispersions have been vigorously developed and promoted. Due to the excellent properties of water-based polyurethane in terms of adhesive strength, toughness, abrasion resistance, chemical resistance and water resistance, water-based polyurethane has gradually gained popularity in the fields of coatings, adhesives, leather finishing agents, pigment printing pastes, and inks. development and will have an important impact on the development of these industries. [0003] There are many reports on the preparation of water-based polyurethane disp...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/66C08G18/42C08G18/48C08G18/32C08G18/34C08G18/12C09J175/06C09J175/08C09D175/06C09D175/08C09D11/00
CPCC08G18/0823C08G18/12C08G18/4808C08G18/6659C08G18/6692C08G18/724C08G18/73C08G18/755C08G18/7614C08G18/3228
Inventor 周之文
Owner SHANGHAI XINGUANG CHEM
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