Method for preparing waterborne polyurethane adhesive used for compound soft packaging

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as inability to meet, achieve fast drying speed, improve heat resistance, and improve bonding strength. Effect

Inactive Publication Date: 2011-02-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, some properties of water-based polyurethane adhesives still have a certain gap with solvent-based polyurethane adhesives, which cannot meet the requirements of adhesives in the field of composite flexible packaging. The water-based polyurethane adhesive is of great significance to the development of the composite flexible packaging industry

Method used

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  • Method for preparing waterborne polyurethane adhesive used for compound soft packaging
  • Method for preparing waterborne polyurethane adhesive used for compound soft packaging
  • Method for preparing waterborne polyurethane adhesive used for compound soft packaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Add 100g of toluene diisocyanate and 233g of polycaprolactone diol PCL220N into a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser device, and react at 80°C for about 2 hours. When the -NCO content of the system reaches 10.66%wt; cool down to 70°C, add 8g 1,4-butanediol, react for 1.5 hours; add 25g epoxy resin (E-44), 25g dimethylolpropionic acid, 8g trimethylolpropane, continue After reacting for 4 hours, add 36g of hydrogenated rosin and stir evenly; cool to 40°C, and neutralize the pH of the system to 7 with triethylamine. Dissolve 2.5g of ethylenediamine in 600ml of water to make a solution, move the above prepolymer to a dispersion device, add the prepared ethylenediamine solution and disperse at a speed of 6000rpm to obtain 1000g of polyurethane emulsion;

[0049] (2) Add 2.0 g of defoamer Foamex830, 5.0 g of wetting agent Wet270, and 5.0 g of adipic hydrazide to the above emulsion, and mix well to obtain a water-based polyuret...

Embodiment 2

[0058] (1) Add 100g of toluene diisocyanate and 225g of polycaprolactone diol PCL220N into a four-necked flask equipped with a stirrer, thermometer, and reflux condenser device, and react at 75°C for about 2.5 hours. When the -NCO content of the system reaches 10.66%wt; cool down to 70°C, add 9.5g 1,4-butanediol, react for 2 hours; add 30g epoxy resin (E-44), 30g dimethylolpropionic acid, 9.5g trimethylolpropane, Continue to react for 5 hours, add 38g of rosin, stir evenly; cool to 40°C, and neutralize the pH of the system to 7 with triethylamine. Dissolve 1.5g of ethylenediamine in 600ml of water to make a solution, move the above prepolymer to a dispersing device, add the prepared ethylenediamine solution and disperse at a speed of 6000rpm to obtain 1000g of polyurethane emulsion;

[0059] (2) Add 1.0 g of defoamer Foamex830, 4.0 g of wetting agent Wet270, and 4.0 g of adipic hydrazide to the above emulsion, and mix well to obtain a water-based polyurethane adhesive.

[006...

Embodiment 3

[0068] (1) Add 100g of toluene diisocyanate and 240g of polycaprolactone diol PCL220N into a four-necked flask equipped with a stirrer, thermometer, and reflux condenser, and react at 80°C for about 2 hours. When the -NCO content of the system reaches 10.66%wt; cool down to 70°C, add 7.5g1,4-butanediol, react for 1 hour; add 18g epoxy resin (E-44), 18g dimethylolpropionic acid, 7.5g trimethylolpropane, Continue to react for 4 hours, add 31g of rosin, stir evenly; cool to 40°C, and neutralize the pH of the system to 7 with triethylamine. Dissolve 4.5g of ethylenediamine in 600ml of water to make a solution, move the above prepolymer to a dispersing device, add the prepared ethylenediamine solution and disperse at a speed of 6000rpm to obtain 1000g of polyurethane emulsion;

[0069] (2) Add 3.0 g of defoamer Foamex830, 6.0 g of wetting agent Wet270, and 6.0 g of adipic hydrazide to the above emulsion, and mix evenly to obtain a water-based polyurethane adhesive.

[0070] The te...

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Abstract

The invention discloses a method for preparing a waterborne polyurethane adhesive used for compound soft packaging. The method comprises the following steps of: reacting polycaprolactone diol and toluene diisocynate until the -NCO content of a system achieves 10.66 weight percent; adding a small-molecule chain extender, adding epoxy resin, dimethylol propionic acid and trimethylolpropane, adding rosin or hydrogenated rosin, and uniformly stirring; cooling, and neutralizing; adding ethylenediamine aqueous solution so as to prepare a modified polyurethane emulsion; adding a defoamer, a wetting agent and a coupling agent into the modified polyurethane emulsion; and uniformly mixing so as to prepare the waterborne polyurethane adhesive. The method solves the problem of bonding a hard bonding material polyurethane film; the adhesive has high wettability, bonding strength and initial adhesion to the polyurethane film, solves the technical problem of bonding the hard bonding material polyurethane film, and can meet the requirement on the adhesive by the compound soft packaging field; and the preparation is rational, has simple and reliable process and high operational flexibility, and is easy for popularization and application.

Description

technical field [0001] The invention relates to polymer chemical synthesis technology, in particular to a preparation method of a water-based polyurethane adhesive used for composite flexible packaging. Background technique [0002] With the development of modern society, people's requirements for commodity packaging are becoming more and more stringent, and any single film can hardly meet the requirements. Therefore, only by combining several films with special properties and combining their respective advantages can they be satisfied. High-performance composite packaging materials for specific requirements. The material formed by laminating and compounding multi-layer films with adhesive is called composite packaging material. Packaging bags made of this composite material are called flexible packaging bags. Because it has the advantages of easy to carry, easy to store and ensure the hygiene of the contents, it is increasingly favored by people and widely used in the pac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/06C08G18/42C08G18/58C09J175/06C08G18/64C08G18/66
Inventor 郭文杰万金泉王艳马邕文
Owner SOUTH CHINA UNIV OF TECH
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