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Aqueous coating agent for aluminum foil and preparation method of aqueous coating agent

A water-based coating and aluminum foil technology, applied in coatings, adhesives, adhesive types, etc., can solve the problems of solvent-based adhesives such as high toxicity, poor use safety, and harm to the human body, so as to improve the coating effect and unwinding Performance, low price, and the effect of saving production costs

Active Publication Date: 2013-04-17
JIANGSU ZHONGJIN MATAI MEDICINAL PACKAGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the problems of high toxicity of solvent-based adhesives, poor use safety, harm to human body and environmental pollution in the aluminum foil coating process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] A kind of preparation method of above-mentioned aluminum foil water-based coating agent, its preparation concrete steps are as follows:

[0042] (1) Add polyester diol after vacuum dehydration in the container, and then add diisocyanate. The above raw materials are added according to the functional group molar ratio 1.0<-NCO / -OH≤2.0, and then add the compound dihydroxyl containing hydrophilic group The amount of methacrylic acid added is 4-6% of the total mass of polyester diol and diisocyanate, and then a catalyst accounting for 0.01-0.3% of the mass percentage of polyester diol is added for reaction, and the reaction temperature is 70-90°C. The reaction time is 0.5-2 hours, and the polyurethane prepolymer whose terminal group is an isocyanate group is obtained;

[0043] (2) Add a small molecule chain extender and an internal crosslinking agent that can react with isocyanate groups to the polyurethane prepolymer prepared above to continue the reaction, wherein the amou...

Embodiment 1

[0052] Example 1 In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, 40 g of polyester diol (molecular weight: 2100), 18.78 g of isophorone diisocyanate, and 3.34 g of dimethylol propionic acid were added, and the temperature was raised To 88°C, add 0.12g dibutyltin dilaurate, react under stirring for 1 hour, add 0.28g trimethylolpropane, add 1.64g 1,4-butanediol, continue to react for 3 hours, add 30g acetone to reduce the viscosity , lower the temperature to 40°C, add 0.43g r-aminopropyltriethoxysilane, continue the reaction for half an hour to obtain a prepolymer, add 2.04g triethylamine to neutralize the prepolymer into an ionomer, and then Add 127g of deionized water to emulsify under shearing, add 0.94g of ethylenediamine to extend the chain, and finally raise the temperature to distill off the acetone to obtain a clear and transparent water-based polyurethane dispersion with bluish light. Under stirring, add 0.4g of polyether-modified polyorgano...

Embodiment 2

[0053] Example 2 In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, 40 g of polyester diol (molecular weight: 2100), 20.86 g of isophorone diisocyanate, and 3.48 g of dimethylol propionic acid were added, and the temperature was raised To 80°C, add 0.07g dibutyltin dilaurate, react under stirring for 1 hour, add 0.28g trimethylolpropane, add 2.19g 1,4-butanediol, continue to react for 3 hours, add 30g acetone to reduce the viscosity , lower the temperature to 35°C, add 0.48g r-aminopropyltriethoxysilane, continue the reaction for half an hour to obtain a prepolymer, add 2.36g triethylamine to neutralize the prepolymer into an ionomer, and then Add 132g of deionized water to emulsify under shearing, add 1.04g of ethylenediamine to extend the chain, and finally raise the temperature to distill off the acetone to obtain a clear and transparent water-based polyurethane dispersion with bluish light. Under stirring, add 0.4g of polyether modified polyorgano...

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Abstract

The invention relates to an aqueous coating agent for aluminum foil and a preparation method of the aqueous coating agent. The aqueous coating agent for the aluminum foil comprises the following components in percentage by weight: 90-99% of a single-component aqueous polyurethane dispersion liquid, 0.05-0.3% of a wetting agent, 0.05-0.3% of a defoaming agent, 0.05-0.3% of a flatting agent and 1-10% of an antisticking agent. The aqueous coating agent provided by the invention has the advantages of high bonding strength, good coating effect, low viscosity and the like, and is antisticking in rolling after coating. Provided by the invention is the aqueous coating agent for the coating production of the aluminum foil; and according to the aqueous coating agent, the harm to human bodies caused by environment pollution is avoided, the production cost is saved, and the development needs of low carbon and environment protection are satisfied.

Description

technical field [0001] The invention relates to an aluminum-plastic blister technology, in particular to a water-based coating agent for aluminum foil and a preparation method thereof. Background technique [0002] Blister packaging first emerged from Europe in the 1930s, and my country began to introduce technology, equipment and raw materials in the 1980s. At first, it was monochrome printing, and then gradually developed into multi-color and color series printing. Blister packaging is widely used, and it is the fastest growing flexible packaging material in recent years, and it is also the main packaging form in other fields such as food, health care products, and pharmaceuticals. In pharmaceutical packaging, it is to place the medicine in the pit (called a blister or blister) of a hard plastic sheet formed by blister, and then use a sheet that is gravure printed and coated with a protective agent and adhesive The aluminum foil is bonded and heat-sealed with the plastic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09J175/06C08G18/66C08G18/42C08G18/32
Inventor 吴新上伏阳张红军陈强项尚林单宁张军周忠武何建忠徐根华
Owner JIANGSU ZHONGJIN MATAI MEDICINAL PACKAGING
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