Preparation method of high solid content waterborne polyurethane

A water-based polyurethane, high solid content technology, applied in the field of resin, can solve the problems of high water quality requirements, heat resistance and adaptability to be improved, etc., to achieve the effect of long drying time, wide particle size distribution, and reducing energy consumption of products

Active Publication Date: 2013-05-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid content of some foreign two-component high-solid-content waterborne polyurethanes can reach 50%, but the requirements for water quality are high, heat resistance and adaptability need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of high solid content aqueous polyurethane of the present invention is realized by the following steps:

[0025] Step 1: Under nitrogen protection, add 40-70 parts by mass of polymer polyol and 10-30 parts by mass of polyisocyanate into the reactor, stir evenly and add 0.01-0.5 parts by mass of catalyst at a temperature of 60-95°C Down reaction 1-2.5 hours;

[0026] Wherein, the polymer polyol is selected from polyethylene adipate, polyneopentyl adipate, polyethylene adipate propylene glycol, polybutylene adipate, polyadipate Hexylene glycol ester, polyethylene adipate diethylene glycol acetal, polytetrahydrofuran diol, polycarbonate diol;

[0027] The polyisocyanate is selected from 4,4-dicyclohexylmethane diisocyanate, isophorone diisocyanate, 1,6-hexyl diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate;

[0028] The catalyst is selected from dibutyltin dilaurate, stannous zincate, organic bismuth MB20.

[0029] Step 2: add...

Embodiment 1

[0039] The preparation method of high solid content waterborne polyurethane is realized by the following steps:

[0040] Step 1: under the protection of nitrogen, add 40 parts by mass of polymer polyol and 10 parts by mass of polyisocyanate into the reactor, stir evenly, add 0.01 part by mass of catalyst, and react at a temperature of 60° C. for 1 hour;

[0041] Wherein, polymer polyol selects polyethylene adipate;

[0042] Polyisocyanate selection4,4 , - dicyclohexylmethane diisocyanate;

[0043] The catalyst is dibutyltin dilaurate.

[0044] Step 2: add 1 mass part of hydrophilic chain extender, and react at 60°C for 1 hour;

[0045] Wherein, the hydrophilic chain extender is selected from dimethylol propionic acid.

[0046] Step 3: Lower the temperature to 40°C, add 4 parts by mass of solvent to reduce the viscosity, then add a neutralizer to neutralize to obtain a prepolymer with a pH of 7, and then disperse the prepolymer in deionized water under high-speed stirring; ...

Embodiment 2

[0054] The preparation method of high solid content waterborne polyurethane is realized by the following steps:

[0055] Step 1: Under the protection of nitrogen, add 50 parts by mass of polymer polyol and 15 parts by mass of polyisocyanate into the reactor, stir evenly, add 0.2 parts by mass of catalyst, and react at a temperature of 70° C. for 1.5 hours;

[0056] Wherein, polymer polyol selects polyethylene adipate propylene glycol ester;

[0057] The polyisocyanate selects isophorone diisocyanate;

[0058] The catalyst is dibutyltin dilaurate.

[0059] Step 2: adding 3 parts by mass of a hydrophilic chain extender and reacting at 70°C for 1 hour;

[0060] Wherein, the hydrophilic chain extender is dihydroxy half ester.

[0061] Step 3: Lower the temperature to 50°C, add 5 parts by mass of solvent to reduce the viscosity, then add a neutralizer to neutralize to obtain a prepolymer with a pH of 7, and then disperse the prepolymer in deionized water under high-speed stirring;...

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Abstract

The invention relates to a preparation method of high solid content waterborne polyurethane. The waterborne polyurethane is higher than common organic solvent in latent heat of evaporation, and water solvent type polyurethane in waterborne polyurethane of the same solid content is slow in solvent evaporation and needs long drying time. The preparation method comprises the steps of mixing polymer polyol with polyisocyanates under the protection of nitrogen, stirring evenly and then adding catalyst for reacting; adding a hydrophilic chain extender for reacting; cooling, adding a solvent and a neutralizer so as to obtain a prepolymer and stirring at high speed so as to disperse in deionized water; adding the chain extender, stirring, reducing pressure and removing the solvent through steaming so as to obtain the waterborne polyurethane emulsion; and preparing the prepolymer of different size distribution, dispersing in the waterborne polyurethane emulsion along with velocity mixing, and stirring for 1-4 hours. The waterborne polyurethane emulsion has wide size distribution and low viscosity, is stable, and can solve the key technical problems of high latent of evaporation, slow volatilization, long drying time, low production efficiency and the like in the field of research of the waterborne polyurethane.

Description

technical field [0001] The invention relates to a resin, in particular to a preparation method of high-solid-content waterborne polyurethane. Background technique [0002] Water-based polyurethane (WPU) refers to polyurethane that uses water instead of organic solvents as the dispersion medium, and its dispersion contains no or very small amounts of organic solvents. The coating film has the advantages of being non-flammable, non-toxic, non-polluting, energy-saving, etc., and has the inherent high strength and wear resistance of general polyurethane resins, so it has been widely used. High solid content waterborne polyurethane has low water content, fast drying and film formation, high solid content emulsion also has the advantages of high equipment utilization rate, transportation cost and low energy consumption per unit product, so it has attracted much attention. [0003] The final state of waterborne polyurethane is a solid film. During the process from the emulsion to...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/42C08G18/48C08G18/44C08G18/12
Inventor 罗晓民杨菲菲曲建波冯见艳刘蕊张鹏
Owner SHAANXI UNIV OF SCI & TECH
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