Waterborne polyurethane material and preparation method thereof

A water-based polyurethane, polyester polyol technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of flammability, poor use safety, high toxicity, etc., and improve the bonding strength. , safe to use, and the effect of improving appearance

Inactive Publication Date: 2012-10-24
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a water-based polyurethane material for food or medicine laminated composite packaging in order to overcome the problems of solvent-based polyurethane adhesives such as high toxicity, flammability, poor use safety, and environmental pollution. Another aspect of the present invention One purpose also provides the preparation method of above-mentioned aqueous polyurethane material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, add 40 g of polyester polyol (molecular weight: 2300), vacuum dehydrate at 109°C for 1 hour, cool down to 60°C and add 17g of isophorone diisocyanate, Raise the temperature to 75°C, react for 1 hour, add 3g of dimethylolpropionic acid, 1.2g of 1,4-butanediol, 0.3g of glycerin, 0.12g of dibutyltin dilaurate, and continue to react for 4 hours while stirring at 75°C. To obtain the prepolymer, add acetone to control the viscosity of the reactant at 3000-5000mPa.s during the reaction, then lower the temperature to about 35°C, add 2g of triethylamine to neutralize the prepolymer to form a salt; discharge to the disperser , adding 0.7g of ethylenediamine for chain extension reaction for 20 minutes, adding 117g of deionized water under shearing for emulsification, and finally distilling off acetone to obtain a translucent yellowing-resistant water-based polyurethane dispersion. Its properties are as fo...

Embodiment 2

[0023] In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, add 40 g of polyester polyol (molecular weight: 2100), vacuum dehydrate at 102°C for 2 hours, cool down to 32°C and add 12g of isophorone diisocyanate, 6g of 1,6-hexamethylene diisocyanate, heated to 71°C, reacted for 2 hours, added 2.3g of dimethylol butyric acid, 2.3g of ethylene glycol, 0.3g of trimethylolpropane, 0.13g of dibutyltin dilaurate, Continue to react at 70°C for 3 hours to obtain a prepolymer. During the reaction, add acetone to control the viscosity of the reactant at 3000-5000mPa.s, then lower the temperature to about 40°C, and add 1.5g of triethylamine to make the prepolymer Neutralize to form a salt; discharge the material into a disperser, add 0.9g of ethylenediamine to extend the chain reaction for 15 minutes, add 125g of deionized water under high-speed shearing, and finally evaporate the acetone to obtain a bluish milky white anti-yellowing water-based polyurethane dispers...

Embodiment 3

[0025] In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, add 40g of polyester polyol (molecular weight: 1800), dehydrate under vacuum at 105°C for 1.5 hours, cool down to 40°C, and add 18g of dicyclohexylmethane diisocyanate , heated to 75°C, reacted for 1.5 hours, added 3.1g of dimethylolpropionic acid, 1.7g of 1,6-hexanediol, 0.1g of stannous octoate, and continued to react for 2 hours under stirring at 80°C to obtain a prepolymer , during the reaction process, the viscosity of the reactant is controlled at 3000-5000mPa.s by adding acetone, then the temperature is lowered to about 35°C, and 2.2g of triethylamine is added to neutralize the prepolymer into a salt; the material is discharged into the disperser, and 0.6 g diethylenetriamine chain extension reaction for 20 minutes, 101 g of deionized water was added under high-speed shearing, and finally acetone was evaporated to obtain a translucent yellowing-resistant water-based polyurethane dispersio...

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Abstract

The invention relates to a waterborne polyurethane material and a preparation method of the material, in particular to a waterborne polyurethane material for laminating and compounding of foods or drugs in the packaging process and a preparation method of the material. The waterborne polyurethane material is prepared by compounding the following components by weight: 100 parts of anti-yellowing waterborne polyurethane dispersion, 0.01-0.2 parts of leveling agent and 0.01-0.2 parts of de-foaming agent. The waterborne polyurethane material has the advantages of yellowing resistance, non-toxicity, non-combustibility, safety in use, environmental protection and the like. The requirements of the laminating and compounding process on the waterborne polyurethane material are comprehensively considered, and the bonding strength and appearance in the laminating and compounding process are improved through carrying out chain extension for multiple times and adding the leveling agent and the waterborne de-foaming agent, wherein the T stripping strength and the readily oxidizable substance in the laminating and compounding process meet the industrial requirements for laminating and compounding of the foods or the medicines.

Description

technical field [0001] The invention relates to a water-based polyurethane material and a preparation method thereof, in particular to a water-based polyurethane material for food or medicine packaging lamination and compounding and a preparation method thereof. Background technique [0002] At present, the polyurethane adhesives used for food or pharmaceutical packaging are mainly solvent-based, and the organic solvents used (generally toluene, ethyl acetate, etc.) are flammable, explosive, volatile, smelly, toxic, and cause pollution when used. It is harmful to people's health, and the residual solvent in the medicine bag will also affect the quality and safety of medicines. At present, developed countries in Europe and the United States have formulated relevant pharmaceutical hygiene regulations, such as the Food and Drug Administration FDA in the United States, EU90 / 128 in the European Union, and BgVV in Germany, all of which clearly stipulate the adhesive types used for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C08G18/66C08G18/42C08G18/12
Inventor 项尚林吴新上
Owner NANJING TECH UNIV
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