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Waterborne polyurethane dispersion and preparation method and application thereof

A technology of water-based polyurethane and polyurethane prepolymer, applied in polyurea/polyurethane coatings, application, animal husbandry, etc., can solve the problems of poor water resistance and stain resistance, and achieve remarkable stain resistance and gloss The effect of high temperature and low VOC emission

Inactive Publication Date: 2019-12-10
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some studies on water-based leather finishes, their water resistance and stain resistance are not as good as solvent-based polyurethane leather finishes

Method used

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  • Waterborne polyurethane dispersion and preparation method and application thereof
  • Waterborne polyurethane dispersion and preparation method and application thereof
  • Waterborne polyurethane dispersion and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0025] A kind of aqueous polyurethane dispersion, its preparation method comprises the following steps (each raw material consumption is by mass parts):

[0026] Step 1. Preparation of polyurethane prepolymer containing hydrophilic monomer: react 62-66 parts of polyol and 23-30 parts of diisocyanate at 80-90°C for 2 hours, then add 0.001-2 parts of polyol to expand Chain agent, 4-7 parts of hydrophilic chain extender, 0.1 part of catalyst and 10 parts of acetone, and react at 80-85 °C for 2-4 hours, then add 1-5 parts of silane coupling agent for reaction, Until the content of -NCO reaches 1-3%, the polyurethane prepolymer is prepared.

[0027] Step 2, neutralization reaction: cool down the polyurethane prepolymer to 25-45°C, add acetone accounting for 40% of the total mass of the polyurethane prepolymer to the polyurethane prepolymer, and then Under the action of shearing, add 2-6 parts of neutralizing agent and react for 3-5 minutes to obtain a neutralized reaction liquid. ...

Embodiment approach

[0030] (1) The polyhydric alcohol adopts polyadipate-1,3-butylene glycol ester diol, polyadipate-2-methyl-1,3-butylene glycol ester diol, polyadipate-1 , 4 butanediol ester diol, polyethylene adipate diol, polytrimethylene adipate diol, polyethylene adipate butylene glycol ester diol, polycaprolactone diol , at least one of polycarbonate diol, polydimethylsiloxane, polypropylene glycol, and double-terminated hydroxyl polyether modified silicone oil, and the number average molecular weight of the polyol is 1000-4000.

[0031] (2) The diisocyanate is at least one of isophorone diisocyanate, diphenylmethane diisocyanate, toluene diisocyanate, and 1,6-hexamethylene diisocyanate.

[0032] (3) The polyol chain extender is at least one of trimethylolpropane, diethylene glycol, 1,4-butanediol, and 1,4-cyclohexanedimethanol.

[0033] (4) The hydrophilic chain extender adopts at least one of dimethylolbutyric acid, dimethylolpropionic acid (DMPA), and A95 (sodium ethylenediamine sulfon...

Embodiment 1

[0047] A kind of aqueous polyurethane dispersion, its preparation method comprises the following steps (each raw material consumption is by mass parts):

[0048] Step 1a. Add 60 parts of polycarbonate diol and 5 parts of polydimethylsiloxane into a three-necked bottle, vacuum dehydrate at 120°C for 2 hours, cool down to 80-85°C, and add 28 parts of isophorone Diisocyanate, keep the temperature at 80-85°C, react for 2h; then add 1 part of trimethylolpropane, 6 parts of DMPA, 0.1 part of organic bismuth catalyst and 10 parts of acetone, keep the temperature at 80-85°C, react for 3h, then add Add 5 parts of γ-aminopropyltriethoxysilane and stir for 20 minutes until the content of -NCO reaches 1-3%, so as to prepare a polyurethane prepolymer.

[0049] Step 2a, cooling the polyurethane prepolymer to 40-45°C, adding 10 parts of acetone to the polyurethane prepolymer to reduce the viscosity of the polyurethane prepolymer, and then adding 5 parts of triethylamine, and reacted for 3 to ...

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Abstract

The invention discloses waterborne polyurethane dispersion and a preparation method and application thereof. The preparation method comprises the steps that polyol and diisocyanate are reacted at 80-90 DEG C for 2 h, then a polyol chain extender, a hydrophilic chain extender and a catalyst are added and reacted at 80-85 DEG C for 2-4 h, and then a silane coupling agent is added for reacting untilthe content of -NCO reaches 1-3%, and thus a polyurethane prepolymer is prepared; the polyurethane prepolymer is cooled to 25-45 DEG C, then a neutralizer is added under the shear action of a high-speed disperser and reacted for 3-5 min, and thus a reaction solution after neutralization is prepared; and under the shear action of the high-speed disperser, a mixed solution of an amine chain extenderand deionized water is added into the reaction solution after neutralization and dispersed for 20-30 min, and thus the waterborne polyurethane dispersion is prepared. According to the waterborne polyurethane dispersion, the stability is good, adhesion is excellent, formed film is transparent, the glossiness is high, stain resistance is remarkable, toxicity is avoided, and the emission load of VOCis low.

Description

technical field [0001] The invention relates to the field of polymer material coatings, in particular to an aqueous polyurethane dispersion and its preparation method and application. Background technique [0002] The leather finishing agents currently used in the market all use solvent-based polyurethanes, but the existing solvent-based polyurethanes have high VOC emissions and high toxicity. Although there are some studies on water-based leather finishing agents, their water resistance and stain resistance are not as good as solvent-based polyurethane leather finishing agents. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a water-based polyurethane dispersion and its preparation method and application, which not only have good stability, excellent adhesion, transparent film formation, high gloss, and stain resistance Significant, and non-toxic, low VOC emissions. [0004] The purpose of th...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/61C08G18/44C08G18/42C08G18/32C08G18/12C09D175/04C09D175/06C09D7/63C14C11/00
CPCC08G18/12C08G18/3206C08G18/4009C08G18/4238C08G18/44C08G18/61C08G18/6644C09D175/04C09D175/06C14C11/006C09D7/63C08G18/3228C08K5/544
Inventor 陈昕罗善国
Owner BEIJING COMENS NEW MATERIALS
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