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Polyurethane, high-solid-content waterborne polyurethane emulsion and preparation method of high-solid-content waterborne polyurethane emulsion

A water-based polyurethane and polyurethane technology, applied in the field of polyurethane materials, can solve the problems of high energy consumption, poor performance in water-resistant environment, and low market proportion, and achieve the effects of mild polymerization conditions, excellent mechanical strength, and small process differences

Pending Publication Date: 2022-07-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The water-based polyurethane emulsion prepared by traditional commercial polyester polyol has a low solid content of only 35-40%, and a large amount of organic solvent is used in the synthesis process, and the later removal process is cumbersome and energy-consuming. The price of emulsion remains high, and there are obvious disadvantages of poor water resistance and environmental conditions, so the application field is very limited, and the market share is far inferior to polyether-based water-based polyurethane

Method used

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  • Polyurethane, high-solid-content waterborne polyurethane emulsion and preparation method of high-solid-content waterborne polyurethane emulsion
  • Polyurethane, high-solid-content waterborne polyurethane emulsion and preparation method of high-solid-content waterborne polyurethane emulsion
  • Polyurethane, high-solid-content waterborne polyurethane emulsion and preparation method of high-solid-content waterborne polyurethane emulsion

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Embodiment approach

[0074] One embodiment of the preparation of the polyurethane of the present invention comprises the following steps:

[0075] (1) Add the poly(ether) ester polyol containing furan ring structure to the three-necked flask device equipped with stirring, nitrogen and vacuuming functions, and dehydrate at 100~150° C. and vacuum degree of 100~1000 Pa for 30~120min , until the water content (mass content) of the polyol is reduced to less than 0.05%, after cooling to 60-90 ° C, add diisocyanate under nitrogen atmosphere, after 1-4 hours of reaction, add hydrophilic chain extender and react for 0.5-2 hours , and then add a small molecule chain extender to react for 0.5 to 2 hours. Depending on the viscosity of the system, an appropriate amount of organic solvent can be added to adjust the viscosity to 100 to 1000 centipoise (cP), and then the temperature is lowered to 30 to 50 ℃. After reacting with the agent for 0.5-2h, the hydrophilic polyurethane precursor is obtained;

[0076] (2...

Embodiment 1

[0088] The design theoretical number average molecular weight is 1000, the hydroxyl value is 112mgKOH / g, the acid value is 0.5mgKOH / g, 2,5-furandicarboxylic acid and ethylene glycol system polyester diol, the preparation method is: weighing 44 grams respectively ethylene glycol and 86 grams of 2,5-furandicarboxylic acid were added to a 250 ml four-necked flask equipped with stirring, distillation, nitrogen and vacuum functions, and the temperature of the system was raised to 130°C under nitrogen. , the system begins to generate water, and after maintaining the reaction at this temperature for 2 hours, there is basically no obvious water effusion phenomenon. Start to vacuumize, control the vacuum to 3000 Pa, and increase the system temperature to 190 °C according to the heating rate of 15 °C / min. , the vacuum degree was gradually reduced to 2000 Pa, kept in this state for 10 minutes, and then heated to 200 ℃ at the same rate, the vacuum degree was gradually reduced to 1500 Pa, t...

Embodiment 2

[0091] The design theoretical number average molecular weight is 1000, the hydroxyl value is 112mgKOH / g, the acid value is 0.5mgKOH / g, 2,5-furandicarboxylic acid and ethylene glycol system polyetherester diol, the preparation method is: weighing 48 g of ethylene glycol, 86 g of 2,5-furandicarboxylic acid, and 0.135 g of tetrabutyl titanate were added to a 250-milliliter four-necked flask equipped with stirring, distillation, nitrogen and vacuuming functions. Under nitrogen, the temperature of the system was raised to 130 °C, and the system began to generate water. After maintaining the reaction at this temperature for 1 hour, there was basically no obvious water effusion phenomenon, and the vacuum was started, and the vacuum degree was controlled to 3000 Pa, and the rate was 15 °C / min. The temperature of the system was raised to 190 °C, the vacuum degree was gradually reduced to 2000 Pa, kept in this state for 10 minutes, and then heated to 200 °C at the same rate, the vacuum d...

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Abstract

The invention discloses polyurethane based on furan type poly (ether) ester polyol and a high-solid-content waterborne polyurethane emulsion prepared from the polyurethane, and belongs to the technical field of polyurethane materials. The solid content of the prepared waterborne polyurethane emulsion can reach 60% at most, and meanwhile, after film forming, the waterborne polyurethane emulsion has high mechanical strength, high toughness, excellent hydrolysis resistance, heat resistance and other performance which are far higher than those of a system based on traditional polyester polyol, and the waterborne polyurethane emulsion has the advantages of being high in mechanical strength, high in toughness, excellent in hydrolysis resistance and heat resistance and the like. The method has very wide application prospects in the industries of various coatings, protective films, adhesives and the like.

Description

technical field [0001] The invention relates to polyurethane, a high-solid content aqueous polyurethane emulsion and a preparation method thereof, and belongs to the technical field of polyurethane materials. Background technique [0002] With the increasing pursuit of green, healthy, safe and environmentally friendly high-quality life, people are more and more inclined to choose products with low or even no harm to the environment and the body. Water-based polyurethane uses water as a solvent, which is environmentally friendly, pollution-free, transportation and The advantages of safe and reliable use and high cost performance are widely used in the coating field of construction, home furnishing and automobile industries. As we all know, polyurethane products based on polyester polyols are very excellent in mechanical strength, heat resistance, aging, solvent resistance and other properties, but there are also shortcomings such as hydrolysis resistance and poor mold perform...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/10C08G18/34C08G18/32C08L75/06C08J5/18
CPCC08G18/4258C08G18/10C08J5/18C08J2375/06C08G18/348C08G18/3206
Inventor 周光远刘佳姜敏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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