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Method for preparing water polyurethane by solventless method

A water-based polyurethane and solvent-free technology, applied in the field of preparation of water-based polyurethane, can solve the problems of flammable and explosive organic solvents, air pollution, and strong odor, and achieve the effects of low cost, not easy to damage, and simple operation

Inactive Publication Date: 2006-11-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional polyurethane is mainly solvent-based, while organic solvents are flammable, explosive, volatile, smelly, cause air pollution when used, and are more or less toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Add 30.4 g of polyester diol and 3 g of dimethylol propionic acid into a four-necked flask equipped with a thermometer, a reflux condenser, and mechanical stirring, heat to 110° C., and vacuum dehydrate at this temperature for 30 minutes After cooling to 80°C, 16.6g of IPDI was added to react at 60°C for 4 hours. Subsequently, the temperature was lowered to 20° C., 112 ml of deionized water dissolved in 2.24 g of triethylamine and 1.12 g of ethylenediamine was added under high-speed stirring, and then the temperature was raised to 60° C. for 1 hour of reaction. A polyurethane dispersion with a solid content of 30% was obtained.

[0012] After the coating film is dried, the breaking strength measured is 22.54MPa, and the breaking elongation is 453.0%.

Embodiment 2

[0013] Embodiment 2: Add 27.12g of polyester diol, 6.78g of polyether diol and 3g of dimethylol propionic acid in a four-necked flask equipped with a thermometer, a reflux condenser, and mechanical stirring, heat to 110°C, and After vacuum dehydration at this temperature for 30 minutes, cool to 80° C., add 13.1 g of IPDI and react at 110° C. for 4 hours. Subsequently, the temperature was lowered to 40° C., 134 ml of deionized water dissolved in 2.26 g of triethylamine and 0.824 g of diethylenetriamine was added under high-speed stirring, and then the temperature was raised to 60° C. for 1 hour of reaction. A polyurethane dispersion with a solid content of 25% was obtained.

[0014] After the coating film is dried, the breaking strength measured is 16.82MPa, and the breaking elongation is 574.9%.

Embodiment 3

[0015] Embodiment Three: Add 23.12g polyester diol, 6.78g polyether diol, 0.18g 1,4 butanediol and 3g dimethylol in a four-necked flask equipped with a thermometer, a reflux condenser, and mechanical stirring Propionic acid, heated to 110°C, dehydrated in vacuum at this temperature for 30 minutes, then cooled to 80°C, added 16.5g IPDI, and reacted at 110°C for 4 hours. Subsequently, the temperature was lowered to 40°C, and deionized water 1361 dissolved in 2.26g of triethylamine and 0.824g of diethylenetriamine was added under high-speed stirring, and then the temperature was raised to 60°C for 1 hour of reaction. A polyurethane dispersion with a solid content of 25% was obtained. After the coating film is dried, the breaking strength is measured to be 19.25a, ​​and the breaking elongation is 549.9%.

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Abstract

A process for preparing water polyurethane by non-solvent method includes such steps as proportional reaction between polyisocyanate and polyol to obtain isocyanate terminated oligomer, cooling, adding water, strong stirring while adding the aqueous solution of triethylamine and ethyldiamine or divinyltriamine, and extending chain while dispersing.

Description

technical field [0001] The invention relates to a method for preparing water-based polyurethane, in particular to a method for preparing water-based polyurethane by a solvent-free method. Background technique [0002] Polyurethane (PU) is the abbreviation of polyurethane (Polyurethane), which is a kind of synthetic material with a very wide range of uses. With the selection of different numbers of functional groups and different types of functional groups during preparation, different synthetic processes can be used to prepare polyurethane products with different properties and various appearance forms. At the same time, it also has the advantages of wide adjustment range of softness and hardness, low temperature resistance, good flexibility and strong adhesion. Traditional polyurethanes are mainly solvent-based, while organic solvents are flammable, explosive, volatile, smelly, cause air pollution when used, and are more or less toxic. Since the end of the 1960s, with the...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/34C08G18/48C08G18/42C08G18/72
Inventor 薛亮胡和丰龚德昌
Owner SHANGHAI UNIV
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