Dry composite water-thined adhesive in soft package and its prepn

A dry compounding and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, etc., can solve the problems of air pollution, hidden dangers of production safety, high prices, etc., and achieve faster finger-drying speed, shortened compounding cycle, and preparation The effect of simple method

Inactive Publication Date: 2007-01-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the adhesives used for flexible packaging in my country are mainly solvent-based polyurethane adhesives, which contain 30-60% volatile organic solvents. The production and use of adhesives pollute the air, affect the health of operators, and have major hidden dangers in production safety.
In addition, flexible packaging using solvent-based adhesives needs to strictly control the residue of solvents in the packaging materials, so as not to cause pollution to the packaging contents and cause major accidents
In September 2003, the National Bureau of Quality Supervision, Inspection and Quarantine announced the spot check results of the instrument packaging film, and the unqualified rate was as high as 15%. The main quality problem was that the hygienic indicators did not meet the standards. ), potassium permanganate consumption, heavy metals, decolorization experiment
[0004] In recent years, the application and development of green and environmentally friendly adhesives in my country's packaging industry has been widely valued. Rohm and Haas of the United States has introduced a mature environmentally friendly water-based adhesive in the US market. The company's water-based adhesive does not contain toluene diisocyanate (TDI). Performance It can also meet the requirements of dry compounding between film and film, film and aluminized film used in general food packaging, replace solvent-based polyurethane adhesives, and can be used on solvent-based dry compounding machines, but the price is relatively high and the compounding process Defects of cycle extension

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Synthesize a polyurethane prepolymer with a molar ratio of -NCO and -OH of 1.2:1, and the mass percentage of solvent acetone in the prepolymer is 30%. In the solvent acetone, add PEG400 (polyethylene glycol), dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI), heat up to 90 ° C, add 2 drops of catalyst di-n-butyltin laurate ( 0.05ml), carry out the polymerization reaction, stop heating after 3.5 hours (measure the NCO value of the reaction system by n-butylamine method); cool to 50°C, add hydrazine to extend the chain, the mole number of hydrazine is the mole number of isophorone diisocyanate 10% of dimethylolpropionic acid, stirred for 0.5 hours, added triethylamine (TEA) (the molar number of triethylamine is equal to the molar number of dimethylol propionic acid) after chain extension to neutralize, and added water to make polyurethane with a solid content of 40%. Self-emulsifying aqueous dispersion, the appearance is blue light emulsion. The molar r...

Embodiment 2

[0033] (1) Synthesize a polyurethane prepolymer with a molar ratio of -NCO and -OH of 1.2:1, and the mass percentage of pyrrolidone as a solvent in the prepolymer is 30%. In the solvent pyrrolidone, add PEG600 (polyethylene glycol), dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI), raise the temperature to 80-90°C, add the catalyst di-n-butyltin dilaurate 0.05 ml, carry out the polymerization reaction, stop heating after 3 hours (measure the NCO value of the reaction system by n-butylamine method); cool to 60°C, add hydrazine to extend the chain, the mole number of hydrazine is the mole of isophorone diisocyanate 10% of the number, stirred for 0.5 hours, added triethylamine (TEA) (the number of moles of triethylamine is equal to the number of moles of dimethylol propionic acid) to neutralize, and added water to form a polyurethane self-emulsifying polyurethane with a solid content of 40%. water dispersion. Wherein the molar ratio of isocyanate group to hydroxyl...

Embodiment 3

[0037] (1) Synthesize a polyurethane prepolymer with a molar ratio of -NCO and -OH of 1.3:1, and the mass percentage of ethyl acetate as a solvent in the prepolymer is 30%. In the solvent acetone, add hexyl adipate diol with a weight average molecular weight of 500, dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI), raise the temperature to 80°C, and add the catalyst dilauric acid Di-n-butyltin 0.05ml, carry out polymerization reaction, stop heating after 3.5 hours (measure the NCO value of reaction system with n-butylamine method); 20% of the mole number of cyanate, stirred for 0.5 hour, added triethylamine (TEA) to neutralize, and added water to form a polyurethane self-emulsifying water dispersion with a solid content of 40%, which was a blue light emulsion. The molar ratio of isocyanate group to hydroxyl group (-NCO to -OH) of the reactive group is 1.3:1, and the number of moles of hydroxyl groups provided by DMPA accounts for 15% of the number of moles of hy...

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Abstract

The present invention discloses one kind of dry composite water-thinned adhesive in soft package and its preparation process. The water-thinned adhesive may be used in combining plastics. The preparation process of the water-thinned adhesive includes the following steps: polymerizing acrylate emulsion in dispersed self-emulsifying polyurethane liquid to obtain hybridized polyurethane / acrylate emulsion; adding mildew inhibitor and defoaming agent; and packing in soft package. The present invention uses water as dispersing medium, has no volatile organic solvent and is environment friendly.

Description

technical field [0001] The invention relates to a water-based adhesive, in particular to a dry-type composite water-based adhesive for flexible packaging and a preparation method thereof. Background technique [0002] The flexible packaging composite film is formed by bonding two or more than two kinds of films to form a unified whole, thereby improving the deficiency of a single film and adapting to the requirements of various commodity packaging. Composite materials are the main flexible packaging substrates. In recent years, the packaging of food, spices, cosmetics, tobacco, wine, and household products in my country has become more and more exquisite, and composite material printing has developed rapidly. In 2004, the total output of plastic packaging materials in my country was 6.343 million tons, an increase of 15.3% over 2003. There are 152 biaxially stretched polypropylene BOPP film equipment imported from China, including 73 production lin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08
Inventor 黄志虹张黎明余勇
Owner SUN YAT SEN UNIV
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