A kind of water-based polyurethane adhesive for fast-drying flexible packaging composite film and preparation method thereof

A water-based polyurethane and flexible packaging technology, applied in adhesives and other directions, can solve the problems of complex preparation process, high energy consumption, easy shrinkage, etc., and achieve the effects of simple process, high solid content and fast drying speed.

Active Publication Date: 2016-03-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the film is easy to shrink when heated, ordinary heat sealing is no longer suitable for composite films, and due to the demand for environmental protection and hygiene, there is an urgent need for a safe, harmless, high-performance adhesive for flexible packaging films to meet the growing demand for flexible packaging composite films. need
The invention with the application number of "201310071629.0" in the Chinese Patent Gazette discloses a synthetic method of water-based polyurethane adhesive for laminating PVDC film and other flexible packaging films. The invention uses polyether and polyester mixed polyols to react with toluene diisocyanate as the main chain of polyurethane , the water-based polyurethane adhesive prepared by this method has a certain bonding strength to films of different materials, but this method needs to add a large amount of water-based curing agent to promote curing, the preparation process is complicated, and the energy consumption is high.

Method used

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  • A kind of water-based polyurethane adhesive for fast-drying flexible packaging composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment prepares the water-based polyurethane adhesive of fast-drying flexible packaging composite film according to the following steps:

[0033] First, polyoxypropylene diol-2000 (N220) and 2,2'-dihydroxypropionic acid (DMPA) were dehydrated for 2.0 hours at a vacuum of 0.10 MPa and 90°C. Add 50g N220 and 5gDMPA into a 500ml four-neck flask equipped with a stirrer, condenser, air guide tube and thermometer, mix and stir, and introduce N 2 , Stir and mix at 75°C for 20min. Cool down to 65°C, add 25g of liquefied MDI and 0.15g of dibutyltin dilaurate under reflux conditions, keep warm and reflux for 4h; heat up to 75°C, add 2g of bisphenol A, 1.5g of trimethylolpropane (TMP), React for 3 hours; cool down to 40°C, first add 15g of acetone to reduce viscosity, then add 4g of triethylamine for neutralization and salt formation for 0.5h; slowly add 135g of deionized water under stirring for high-speed emulsification for 0.5h, and then vacuum decompression to dehydr...

Embodiment 2

[0035]This embodiment prepares water-based polyurethane adhesive in the same manner as in Example 1, the difference is that: 25g liquefied MDI is replaced by 15g liquefied MDI and 6gTDI, 5gDMPA is replaced by 4gDMPA, and the amount of deionized water is adjusted so that the solid content is 40 %. Finally, a translucent and bluish emulsion is obtained, which is the water-based polyurethane adhesive.

Embodiment 3

[0037] This embodiment prepares water-based polyurethane adhesive in the same manner as in Example 1, the difference being: 50gN220 is replaced by 9gN330 (polyoxypropylene triol-3000, trifunctionality) and 25gN220, and the addition of deionized water is adjusted so that the theoretical The solid content is 40%. Finally, a white emulsion is obtained, which is a water-based polyurethane adhesive.

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Abstract

The invention discloses a waterborne polyurethane adhesive for a quick-drying soft package composite film and a preparation method of the adhesive. The preparation method is characterized by comprising the following steps: performing pre-polymerization reaction on hydroxyl monomers, hydrophilic monomers and polyisocyanate monomers, and performing chain extension reaction, neutralization reaction, dispersion emulsification and thickening leveling to obtain the finished adhesive. According to the preparation method of the waterborne polyurethane adhesive for the quick-drying soft package composite film, the monomers in specific structures are selected and used, and the structure and distribution of soft and hard sections in a polyurethane structure are controlled to form moderate phase separation and crosslinking between the soft and hard sections, so that the adhesive can be quickly cured without an additional curing agent; the obtained adhesive for the quick-drying soft package composite film has the advantages of being high in solid content, high in drying speed, high in adhesive strength and excellent in storage property, and the process is simple and easy to popularize.

Description

technical field [0001] The invention relates to a quick-drying water-based polyurethane adhesive for flexible packaging composite films and a preparation method thereof, belonging to the field of adhesive materials. Background technique [0002] Polyurethane adhesives are widely used in the bonding of packaging, leather, and automobiles because of their structural designability and good comprehensive performance. At present, polyurethane adhesives are mainly divided into solvent-based, solvent-free and water-based polyurethane adhesives. Solvent-based polyurethane adhesives are prepared by solution polymerization with organic solvents such as acetone as the main solvent. Therefore, solvent-based polyurethane adhesives not only pollute the environment, have low safety factors, but also do great harm to human health during production and use. [0003] Water-based polyurethane adhesives use water instead of organic solvents as the dispersion medium, retaining the advantages o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J175/06C09J11/00C08G18/66C08G18/48C08G18/32C08G18/12
Inventor 丁运生孙静李雅迪薛攀孙晓红方华高
Owner HEFEI UNIV OF TECH
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