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,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1: Add 30.4g of polyester diol and 3g of dimethylolpropionic acid into a four-neck flask equipped with a thermometer, reflux condenser and mechanical stirring, heat to 110°C, and vacuum dehydration at this temperature for 30 minutes After cooling to 80°C, 16.6g of IPDI was added and reacted at 60°C for 4 hours. Subsequently, the temperature was lowered to 20° C., 112 ml of deionized water containing 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 reaction for 1 hour. A polyurethane dispersion system with a solid content of 30% is obtained.

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

Example Embodiment

[0013] Example 2: Add 27.12g polyester diol, 6.78g polyether diol and 3g dimethylolpropionic acid into a four-neck flask equipped with a thermometer, reflux condenser and mechanical stirring, and heat to 110°C. After 30 minutes of vacuum dehydration at this temperature, it was cooled to 80°C, and 13.1 g of IPDI was added to react at 110°C for 4 hours. Subsequently, the temperature was lowered to 40° C., 134 ml of deionized water containing 2.26 g of triethylamine and 0.824 g of diethylene triamine were added under high-speed stirring, and then the temperature was raised to 60° C. for reaction for 1 hour. A polyurethane dispersion system with a solid content of 25% is obtained.

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

Example Embodiment

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