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Preparation method of waterborne polyurethane

A technology for water-based polyurethane and polyester diol, applied in the field of chemical synthesis, can solve the problems of difficult control of the preparation process of water-based polyurethane and the use of sulfonic acid type chain extenders, etc., and achieves easy large-scale production, high solid content, Good dispersion stability

Inactive Publication Date: 2015-09-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfonic acid chain extenders are not used much in industry at present
Mainly because the moisture contained in the sulfonic acid type chain extender will lead to difficult control of the waterborne polyurethane preparation process

Method used

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  • Preparation method of waterborne polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation method of aqueous polyurethane, concrete steps are:

[0044] In the reaction equipment equipped with stirrer, thermometer and reflux condenser, add PCL (number average molecular weight 3000) 1Kg, then add HDI 0.2Kg and LDMPA 0.1Kg (hydroxyl value 550KOH mg / g, acid value 355KOHmg / g), After stirring evenly, the temperature was raised slowly, and the reaction was stirred at 80° C. for 2 h. Then lower the temperature to 35°C, add 20gTEA, neutralize at 30°C, add acetone to adjust the viscosity, stir for 0.5h to obtain a prepolymer; then slowly add 1.3Kg of distilled water into the system, and vigorously stir to emulsify and disperse. Then add the aqueous solution of 11g EDHPS, continue to stir and react for 1h, finally, the low-boiling-point solvent acetone is removed by vacuum distillation, and the water-based polyurethane with a solid content of 50% is obtained.

[0045] Mechanical properties of water-based polyurethane film: tensile strength at brea...

Embodiment 2

[0047] In the reaction equipment equipped with stirrer, thermometer and reflux condenser, add PTMEG (number average molecular weight 2000) 1.1Kg, then add IPDI 0.2Kg and LDMPA 0.1Kg (hydroxyl value 550KOH mg / g, acid value 355KOHmg / g) After stirring evenly, the temperature was raised slowly, and the reaction was stirred at 80° C. for 2 h. Then lower the temperature to 35°C, add 20gTEA, neutralize at 30°C, add acetone to adjust the viscosity, stir for 0.5h to obtain a prepolymer; then slowly add 1.3Kg of distilled water into the system, and vigorously stir to emulsify and disperse. Then add 11 g of AAS-Na aqueous solution, continue to stir and react for 1 h, and finally, distill under reduced pressure to remove acetone, a low-boiling solvent, to obtain water-based polyurethane with a solid content of 50%.

[0048] The mechanical properties of the waterborne polyurethane film: the tensile breaking strength is 55Mpa, and the breaking elongation is 530%.

Embodiment 3

[0050] In the reaction equipment equipped with stirrer, thermometer and reflux condenser, add PTMEG (number average molecular weight 2000) 1.1Kg, then add IPDI0.2Kg and LDMBA0.1Kg (hydroxyl value 500KOH mg / g, acid value 345KOHmg / g) After stirring evenly, the temperature was raised slowly, and the reaction was stirred at 80° C. for 2 h. Then lower the temperature to 35°C, add 20gTEA, neutralize at 30°C, add acetone to adjust the viscosity, stir for 0.5h to obtain a prepolymer; then slowly add 1.3Kg of distilled water into the system, and vigorously stir to emulsify and disperse. Then add 11 g of DHPA aqueous solution, continue to stir and react for 1 h, and finally, distill under reduced pressure to remove acetone, a low-boiling solvent, to obtain water-based polyurethane with a solid content of 50%.

[0051] The mechanical properties of the waterborne polyurethane film: the tensile breaking strength is 55Mpa, and the breaking elongation is 530%.

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Abstract

The invention provides a preparation method of waterborne polyurethane. The preparation method of the water polyurethane is characterized by comprising the first step of adding diisocyanate and chain extender into the polyether glycol or / and polyester dihydric alcohol, stirring and reacting for 1-4 hours at the temperature of 70-80 DEG C, reducing the temperature to 30-40 DEG C, adding the neutralizer for neutralizing, adjusting the viscosity with acetone and obtaining the prepolymer; and the second step of adding distilled water, stirring for emulsion dispersion, adding sulfoacid chain extender, stirring and reacting for 0.5-4 hours, conducting the reduced pressure distillation, removing acetone and obtaining the waterborne polyurethane. The prepared novel waterborne polyurethane is high in strength, good in stability of emulsion dispersion, simple in operation technology, friendly for environment and easy for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane, which belongs to the technical field of chemical synthesis. Background technique [0002] Since its industrialization in the 1990s, water-based polyurethane has been widely used in the textile and leather processing industries due to its excellent performance. With the strengthening of people's awareness of environmental protection and environmental protection laws and regulations, the research and development of environmentally friendly water-based polyurethane has been paid more and more attention, and it is gradually occupying the market of solvent-based polyurethane, which represents the development direction of coatings and adhesives. [0003] At present, the most commonly used anionic chain extender 2,2-dimethylolpropionic acid (DMPA) is used to prepare carboxylate-type waterborne polyurethane in industry. The following formula is the molecular structural formula of DMPA:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/40C08G18/48C08G18/12C08G18/08
CPCC08G18/0823C08G18/12C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/4854C08G18/3857C08G18/3855
Inventor 陈大俊吴键儒万婷
Owner DONGHUA UNIV
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