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Aqueous polyurethane adhesive and preparation thereof

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problem of not meeting the adhesive force requirements of shoe adhesives, low cross-linking degree, small molecular weight of polyurethane, etc. Problems, to achieve stable and controllable polymerization process, excellent anti-aging ability, and improve the effect of initial bond strength

Inactive Publication Date: 2009-01-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the disadvantages of water-based polyurethane adhesives are low solid content, low cross-linking degree, poor strength and water resistance, and high requirements for emulsification technology.
Among them, the low solid content causes slow water volatilization, many times of glue application, and high storage and transportation costs
In addition, the molecular weight of polyurethane is small, the polarity of the chain segment is small, and the content of the hard segment is low, so it cannot meet the adhesive force requirements of shoe adhesives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare the water-based polyurethane adhesive in the following parts by weight ratio:

[0038] Water-based polyurethane dispersion 100 parts

[0039] Thickener acrylic acid copolymer 0.25 parts

[0040] Leveling agent polyether modified polyorganosiloxane 0.08 parts

[0041] Defoamer Glycerin polyoxyethylene-polyoxypropylene copolymer 0.05 parts

[0042] Antioxidant tris(2,4-di-tert-butylphenyl) phosphite 0.02 parts

[0043] The preparation steps are as follows:

[0044](1) Preparation of polyurethane prepolymer: Add an excess of the first polyol polycaprolactone diol with a molecular weight of 1000 to a single-necked flask, dry it in vacuum at 100° C. for 3 hours, cool down to 50° C., and set aside. Add 100 parts of the first polyol to a four-necked flask equipped with a reflux condenser, a thermometer, a stirrer and a nitrogen inlet, keep the temperature at 50 ° C, add 0.08 parts of stannous octoate catalyst, and dropwise add diisocyanate monomer isofor 55 parts ...

Embodiment 2

[0050] Prepare the water-based polyurethane adhesive in the following parts by weight ratio:

[0051] 100 parts of water-based polyurethane dispersion

[0052] Thickener acrylic acid copolymer 0.10 parts

[0053] Leveling agent polyether modified polyorganosiloxane 0.25 parts

[0054] Defoamer Glycerin polyoxyethylene-polyoxypropylene copolymer 0.02 parts

[0055] Antioxidant tris(2,4-di-tert-butylphenyl) phosphite 0.05 parts

[0056] The preparation steps are as follows:

[0057] (1) Preparation of polyurethane prepolymer: Add an excess of the first polyol polybutylene adipate diol with a molecular weight of 1000 to a single-necked flask, dry it in vacuum at 110° C. for 2 hours, cool down to 70° C., and set aside. Add 100 parts of the first polyol to a four-necked flask equipped with a reflux condenser, a thermometer, a stirrer and a nitrogen inlet, keep the temperature at 70°C, add 0.08 parts of stannous octoate catalyst, and dropwise add diisocyanate monomer isofor 55 ...

Embodiment 3

[0063] Prepare the water-based polyurethane adhesive in the following parts by weight ratio:

[0064] 100 parts of water-based polyurethane dispersion

[0065] Thickener acrylic acid copolymer 0.15 parts

[0066] Leveling agent polyether modified polyorganosiloxane 0.15 parts

[0067] Defoamer Glycerin polyoxyethylene-polyoxypropylene copolymer 0.03 parts

[0068] Antioxidant tris(2,4-di-tert-butylphenyl) phosphite 0.03 parts

[0069] The preparation steps are as follows:

[0070] (1) Preparation of polyurethane prepolymer: Add an excess of the first polyol polybutylene adipate diol with a molecular weight of 1000 to a single-necked flask, dry it in vacuum at 120° C. for 1 hour, cool down to 90° C., and set aside. Add 100 parts of the first polyol to a four-neck flask equipped with a reflux condenser, a thermometer, a stirrer and a nitrogen inlet, keep the temperature at 90°C, add 0.08 parts of stannous octoate catalyst, and dropwise add diisocyanate monomer bicyclic 65 p...

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PUM

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Abstract

The invention discloses a waterborne polyurethane adhesive which comprises the following compositions in mass portion: 100 portions of waterborne polyurethane dispersoid, 0.08 to 0.25 portion of thickener, 0.08 to 0.25 portion of flatting agent, 0.02 to 0.05 portion of antifoaming agent and 0.02 to 0.05 portion of antioxidant. The invention also discloses a method for preparing the adhesive. The preparation method is to drip multi-amine compound into the waterborne polyurethane dispersoid, to react for 15 to 30 minutes at a temperature of between 10 and 25 DEG C, to remove organic solvent in the waterborne polyurethane dispersoid, to add the thickener, the flatting agent, the antifoaming agent and the antioxidant again, to uniformly mix the materials, and then to obtain the waterborne polyurethane adhesive. The preparation method disclosed by the invention has a simple technology, and the waterborne polyurethane adhesive prepared has the characteristics of high solid content, quick drying speed, large bonding strength, large tensile strength, good elasticity, and superior water resistance, solvent resistance and high and low temperature resistance.

Description

technical field [0001] The invention relates to a water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane adhesives are widely used in the bonding of construction, automobiles, home decoration, packaging, printing, leather, handicrafts, etc. because of their good comprehensive performance and performance adjustability. At present, polyurethane adhesives are divided into solvent-based, solvent-free and water-based polyurethane adhesives from different use systems. Solvent-based polyurethane adhesives have the disadvantages of polluting the environment and low solid content. In addition, the glue coating process is very harmful to operators. The development of solvent-free polyurethane adhesives has just started in China, and its synthesis process is complicated. The performance obtained at present cannot be compared with solvent-based polyurethane adhesives. It is mainly used for bonding composite films, but it has the a...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J7/00C08G18/10C08G18/42C08G18/72
Inventor 陈旭东朱祖钊张逢君麦碧云
Owner SUN YAT SEN UNIV
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