Preparation method of single-component water-based polyurethane adhesive for use in flexible package compounding

A water-based polyurethane adhesive, one-component technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of high TDI activation temperature, rising use cost, and affecting coating effect, etc., to achieve Put an end to the effects of insufficient composite strength, improved performance, wide use and development prospects

Active Publication Date: 2014-06-25
SHANDONG HUACHENG HIGH TECH ADHESIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used ester-soluble composite adhesives have a strong odor, poor initial viscosity, and long curing time, and the current water-based polyurethane adhesives used in the composite field are also two-component, and a curing agent needs to be added before use. Hydrophilic polyisocyanate , resulting in inconvenient use; the use is for one-time use, so that the glue solution stored in the glue tank cannot be used again when it is not used up, resulting in waste and a sharp increase in use costs
[0003] Invention patent 200710026211.2 discloses a preparation method of water-based polyurethane adhesive. The synthesis of modified polyurethane prepolymer is completed by using modified epoxy resin, and the synthesis of modified epoxy resin in this patent requires high temperature modification. Sex, the production is more complicated, and the reaction also uses acetone solvent, and acetone is poisonous, which is not conducive to environmental protection
[0004] Invention patent 201010291234.8 discloses a preparation method of water-based polyurethane adhesive for composite flexible packaging, in which TDI used for isocyanate obviously has high activation temperature and is not resistant to yellowing; secondly, the rosin used is easy to The phenomenon of roller sticking occurs when the reaction is started for a long time, which affects the coating effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a reaction vessel with a stirrer, a thermometer and a cooler, add 800 grams of 1,4-butylene adipate diol with a molecular weight of 2000, and polyethylene adipate propylene glycol with a molecular weight of 1000 100 grams of diol, 200 grams of polyether polyol N210 with a molecular weight of 1000, heated to 110°C, and dehydrated under a vacuum with a pressure of less than 0.5KPa for 0.5 to 1 hour to reduce the moisture content to less than 0.1%, and then lower the temperature to less than Equal to 60°C, then add 300 grams of isophorone diisocyanate, then add the catalyst dibutyltin dilaurate 300ppm, react at a constant temperature of 75-80°C for 2-3 hours, then add 50 grams of N-ethylpyrrolidone and 55 grams of di Methylolpropionic acid, continue to react for 2 hours to obtain a polyurethane prepolymer; then add 20 grams of epoxy resin E51 and 80 grams of γ-aminopropyltriethoxysilane to continue the reaction for 1.5 hours to obtain a modified polyurethane prepolymer ...

Embodiment 2

[0030] In the reaction vessel with stirrer, thermometer, cooler, add the polyethylene adipate propylene glycol ester diol 800 grams that molecular weight is 2000, the polyethylene adipate propylene glycol ester diol 200 that molecular weight is 1000 grams, 100 grams of polyether polyol N210 with a molecular weight of 1000, heated to 110°C, dehydrated under a vacuum with a pressure of less than 0.5KPa for 0.5 to 1 hour to reduce the moisture content to less than 0.1%, and then cooled to less than or equal to 60°C , then add 300 grams of isophorone diisocyanate, then add the catalyst stannous octoate 300ppm, react at a constant temperature of 75 to 80°C for 2 to 3 hours, then add 50 grams of N-ethylpyrrolidone and 52 grams of dimethylolpropane acid, continue to react for 2 hours to obtain a polyurethane prepolymer; then add 30 grams of epoxy resin E51 and 60 grams of gamma-glycidyl ether propyl trimethoxysilane and continue to react for 1.5 hours to obtain a modified polyurethane...

Embodiment 3

[0033] In a reaction vessel with a stirrer, a thermometer and a cooler, add 650 grams of 1,4-butylene adipate diol with a molecular weight of 2000, and polyethylene adipate propylene glycol with a molecular weight of 1000 250 grams of diol, 200 grams of polyether polyol N210 with a molecular weight of 1000, heated to 110°C, and dehydrated for 0.5 to 1 hour under a vacuum with a pressure of less than 0.5KPa to reduce the moisture content to less than 0.1%, and then lower the temperature to less than Equal to 60°C, then add 300 grams of isophorone diisocyanate, then add the catalyst dibutyltin dilaurate 200ppm, react at a constant temperature of 75-80°C for 2-3 hours, then add 50 grams of N-ethylpyrrolidone and 60 grams of di Methylolpropionic acid, continue to react for 2 hours to obtain a polyurethane prepolymer; then add 10 grams of epoxy resin E51 and 50 grams of γ-aminopropyl triethoxysilane to continue the reaction for 1.5 hours to obtain a modified polyurethane prepolymer ,...

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Abstract

The invention discloses a preparation method of a single-component water-based polyurethane adhesive for use in flexible package compounding. The method comprises the following steps: reacting polyisocyanate with polyester polyol and polyether polyol, adding a chain extender, and continually reacting to obtain a polyurethane prepolymer; continually reacting epoxy resin with a modifier of a silane coupling agent to obtain a modified polyurethane prepolymer; cooling the modified prepolymer, neutralizing and salifying, and adding water for high-speed dispersion to obtain the single-component water-based polyurethane adhesive for use in flexible package compounding. The method is simple in preparation process, and the obtained single-component water-based polyurethane adhesive is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane glue, and in particular relates to a method for preparing a single-component water-based polyurethane glue used for compounding flexible packaging. Background technique [0002] The trend of environmental protection has become a topic of concern in the world, which makes the development of water-based adhesives a necessity. The currently used ester-soluble composite adhesives have a strong odor, poor initial viscosity, and long curing time, and the current water-based polyurethane adhesives used in the composite field are also two-component, and a curing agent needs to be added before use. Hydrophilic polyisocyanate , resulting in inconvenient use; the use is for one-time use, so that the glue that is not used up and stored in the glue tank cannot be used again, resulting in waste and a substantial increase in use costs. [0003] Invention patent 200710026211.2 discloses a prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/06C08G18/83C08G18/75C08G18/48C08G18/42C08G18/34C08G18/12
Inventor 陈丙山王志武
Owner SHANDONG HUACHENG HIGH TECH ADHESIVE
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