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Waterborne polyurethane for food or medicine packaging lamination composite and preparation method thereof

A water-based polyurethane, packaging layer technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesive additives, etc., can solve the problems of poor leveling, high content of easy oxides, poor yellowing resistance, etc. To achieve the effect of good anti-stick performance, low easy oxide and good water resistance

Active Publication Date: 2014-11-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of solvent-based polyurethane adhesives such as high toxicity, flammability, poor use safety, and environmental pollution, as well as water-based polyurethane adhesives with low solid content, high viscosity, easy anti-sticking, poor water resistance, and poor leveling. , poor yellowing resistance, high content of easy oxides, etc., and a food or drug packaging laminated composite water-based polyurethane for food or drug laminated packaging is proposed. Another purpose of the present invention is to provide the above food or drug Preparation method of packaging lamination composite water-based polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a reactor equipped with a stirrer, a thermometer and a reflux condenser, 40 g of polyester polyol (Zhejiang Huafeng New Materials Co., Ltd., PA-1225P) was added, vacuumed and dehydrated at 100 °C for 2 hours, cooled to 30 °C, and added Isophorone diisocyanate 5g, 1,6-hexamethylene diisocyanate 6g, heat up to 70 ℃, react for 2h, add dimethylolbutyric acid 1.3g, trimethylolpropane 1.3g, dibutyltin dilaurate 0.03g , continue to react for 4h under stirring to obtain a prepolymer. During the reaction process, the viscosity of the reactant is controlled at 4000±100mPa.s by adding acetone, then the temperature is lowered to 30℃, and 0.75g of triethylamine is added to neutralize the prepolymer. salt; discharge to the disperser, add 0.14g of ethylenediamine for chain extension reaction for 30 minutes, add 90g of deionized water under high-speed shearing, and finally steam out acetone to obtain water-based polyurethane dispersion; Add 5.5g methyl methacrylate and 0.05g azobisi...

Embodiment 2

[0025] In a reactor equipped with a stirrer, a thermometer and a reflux condenser, 40 g of polyester polyol (Shandong Huacheng Hi-Tech Adhesive Co., Ltd., AD-60) was added, vacuumed and dehydrated at 105 ° C for 1.5 h, cooled to 40 ° C and added Dicyclohexylmethane diisocyanate 16g, heated to 75°C, reacted for 1.5h, added 2.3g of dimethylolpropionic acid, 0.6g of glycerol, and 0.1g of stannous octoate, and continued to react for 3h under stirring to obtain a prepolymer, During the reaction, the viscosity of the reactant was controlled at 4000±300mPa.s by adding acetone, then the temperature was lowered to 40°C, and 1.7g of triethylamine was added to neutralize the prepolymer into a salt; Ethylene triamine chain extension reaction was carried out for 20 minutes, 145 g of deionized water was added under high-speed shearing, and acetone was finally evaporated to obtain an aqueous polyurethane dispersion; the temperature was raised to 75 ° C, and 62 g of styrene and 0.3 g of ethyle...

Embodiment 3

[0027]In a reactor equipped with a stirrer, a thermometer and a reflux condenser, 40 g of polyester polyol (Zhejiang Huafeng New Materials Co., Ltd., PA-1225T) was added, vacuumed and dehydrated at 110 °C for 2 hours, cooled to 50 °C, and added 12g of isophorone diisocyanate, 6g of methylcyclohexyl diisocyanate, heated to 80°C, reacted for 1h, added 4g of dimethylolpropionic acid, 0.2g of trimethylolpropane, 0.19g of dibutyltin dilaurate, in Continue the reaction for 2 hours under stirring to obtain a prepolymer. During the reaction, add acetone to control the viscosity of the reactant at 4000±500 mPa.s, then cool down to 50 °C, and add 3.3 g of triethylamine to neutralize the prepolymer to form a salt; Discharge into the disperser, add 1.2g of ethylenediamine for chain extension reaction for 10 minutes, add 220g of deionized water under high-speed shearing, and finally steam out acetone to obtain water-based polyurethane dispersion; raise the temperature to 80°C, within 4h Ad...

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Abstract

The invention provides waterborne polyurethane for food or medicine packaging lamination composite and a preparation method thereof. The waterborne polyurethane is prepared by compounding the following components in parts by weight: 100 parts of acrylate modified waterborne polyurethane dispersion, 0.05 to 0.25 part of a wetting agent, 0.05 to 0.2 part of a flatting agent, and 0.1 to 0.2 part of a defoamer. The waterborne polyurethane has the advantages of high solid content, low viscosity, stick prevention, good water resistance, good levelling property, yellowing resistance, low readily oxidizable substance content and the like, can be applied to the lamination composite of food or medicine packaging material, and can also be applied to fields of water-based paint, wood lacquer, printing ink and the like.

Description

technical field [0001] The invention relates to a water-based polyurethane and a preparation method thereof, in particular to a food or medicine packaging lamination composite water-based polyurethane and a preparation method thereof. Background technique [0002] In recent years, the pressure of public opinion to protect the global environment has been increasing day by day. Organic solvents are flammable, explosive, volatile, smelly, and cause air pollution during use. Pharmaceutical packaging products produced with solvent-based polyurethane materials have more or less hidden dangers of toxicity. Water-based polyurethane materials use water as the basic medium, and have the advantages of non-combustibility, low odor, no environmental pollution, energy saving, convenient operation and processing, etc., and have attracted people's attention. Although my country's current pharmaceutical packaging industry still uses solvent-based polyurethane materials, it is a general tren...

Claims

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Application Information

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IPC IPC(8): C09J175/14C09J11/06C08G18/72C08G18/67C08G18/66C08G18/42C08G18/32C08G18/22C08G18/12
Inventor 项尚林刘超吴新上
Owner NANJING UNIV OF TECH
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