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Waterborne polyurethane emulsion and preparation method thereof

A water-based polyurethane and emulsion technology, which is applied in the field of polymer materials to achieve good flame retardant performance, strong chemical stability, and good water and solvent resistance.

Active Publication Date: 2014-10-22
FUJIAN POLYTECH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the hydrophilic groups used in anionic waterborne polyurethanes are generally sulfonic acid groups or carboxylic acid groups. There are few studies on the synthesis of waterborne polyurethanes with chain extenders with phosphoric acid hydrophilic groups. The chain extender of phosphoric acid hydrophilic group and carboxylic acid hydrophilic group to synthesize waterborne polyurethane has not been reported

Method used

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  • Waterborne polyurethane emulsion and preparation method thereof
  • Waterborne polyurethane emulsion and preparation method thereof
  • Waterborne polyurethane emulsion and preparation method thereof

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preparation example Construction

[0047] The present invention also provides a kind of preparation method of aqueous polyurethane emulsion, comprises the following steps:

[0048] (1) Dehydrating the oligomer polyol and the small molecule chain extender until the moisture content of the oligomer polyol and the small molecule chain extender is 0.05%;

[0049] (2) Mix the oligomer polyol and the small molecule chain extender after dehydration in step (1) with the diisocyanate, add a solvent, carry out at 60-85°C, measure the reaction system during the reaction NCO content;

[0050] (3) After the NCO content is stable, add the hydrophilic chain extender and catalyst, and react under the condition that the viscosity of the reaction system does not exceed 5000MPas, and measure the NCO content of the reaction system during the reaction;

[0051] (4) When the NCO content is stable, cool to 45-50° C., add the salt-forming reagent, and carry out neutralization reaction to obtain a water-based polyurethane prepolymer;

...

Embodiment 1

[0062] Step 1: 50 g of polytetrahydrofuran ether diol with a molecular weight of 2000, 50 g of polybutylene adipate diol with a molecular weight of 2000, 2 g of neopentyl glycol, and 2 g of trimethylol propane were vacuumized at 100 ° C Dehydration for 1h, the vacuum degree is -0.08~-0.1mPa, so that the moisture content is less than 0.05%; because the oligomer polyol or small molecule chain extender may absorb moisture in the air during storage, the water will interact with the polyisocyanate reaction, resulting in a gel, so it is very necessary to dehydrate them before use.

[0063] Step 2: Put the diol mixture obtained in Step 1 into the reaction kettle, add 40g of isophorone diisocyanate at 80°C, and measure the NCO content in the system by the di-n-butylamine method every half hour. After 2 hours of reaction, the content of NCO reached a stable level and did not change;

[0064] Step 3: Lower the temperature of the reaction system to 75°C, add 18g of hydrophilic chain ext...

Embodiment 2

[0073] Step 1: Vacuumize and dehydrate 120 g of polytetrahydrofuran ether diol with a molecular weight of 2000 at 100°C for 1 hour, and the degree of vacuum is -0.08~-0.1mPa, so that the moisture content is less than 0.05%;

[0074] Step 2: Put the diol obtained in step: 1 into the reaction kettle, add 40g of isophorone diisocyanate and 7.5g of hexamethylene diisocyanate at 85°C, and use diisocyanate every half hour The NCO content in the system is measured by the butylamine method. After 2 hours of reaction, the NCO content reaches a stable level and does not change;

[0075] Step 3: Lower the temperature of the system by 75°C, add 21.96g of hydrophilic chain extender and 0.1ml of organic bismuth catalyst, measure the NCO content in the system with the di-n-butylamine method every half hour, and react for 1 hour, the system If the viscosity is too high, add 40g butanone to continue the reaction. After 3 hours of reaction, the content of NCO becomes stable and does not change;...

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Abstract

The invention relates to a waterborne polyurethane polymerization monomer, and relates to a waterborne polyurethane emulsion which is obtained by polymerizing the waterborne polyurethane polymerization monomer. The waterborne polyurethane emulsion is prepared by the following raw materials in percentage by weight: 5-20% of oligomer polyols, 0-5% of micromolecule chain extender, 5-14% of diisocyanate, 1-5% of hydrophilic chain extender, 1-5% of saltifying reagent, 0.1-0.5% of catalyst and 50-70% of deionized water. The invention also relates to a preparation method of the waterborne polyurethane emulsion. The waterborne polyurethane emulsion provided by the invention has strong chemical stability, good water tolerance and solvent resistance, excellent adhesive force and favorable flame retardance, so that the research gap of waterborne polyurethane products simultaneously containing phosphoric acid hydrophilic group and carboxylic acid hydrophilic group in the prior art is filled.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, which has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. The water-based polyurethane resin has gradually replaced the solvent-based and has become an important direction for the development of the polyurethane industry. Waterborne polyurethane can be widely used in coatings, adhesives, fabric coating and finishing agents, leather finishing agents, paper surface treatment agents and fiber surface treatment agents. The who...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/38C08G18/32
CPCC08G18/0823C08G18/12C08G18/3889C08G18/4018C08G18/4238C08G18/44C08G18/4854C08G18/6607C08G18/6611
Inventor 庄昌清陈尚泰陈炳琪林芙蓉
Owner FUJIAN POLYTECH TECH CO LTD
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