Method of preparing watersoluble polyurethane adhesive

A water-based polyurethane and adhesive technology, applied in the field of polymer chemistry, can solve problems such as damage to the health of operators, potential safety hazards, environmental pollution, etc., and achieve the effect of eliminating adverse effects, easy cleaning, and eliminating damage.

Inactive Publication Date: 2009-08-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Less dosage, good initial tack, cold bonding, and cheap price are its advantages, but these traditional adhesives contain volatile organic compounds (VOCs) and benzene-based toxic solvents, which have problems such as environmental pollution and safety hazards, and damage The physical health of the operators, which is a fatal shortcoming, has not adapted to the requirements of the development of the shoe industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: 1) First, isophorone diisocyanate and polyoxypropylene glycol are mixed uniformly by the mass ratio of 1: 1.5, then add the dibutyltin dilaurate of mixture quality 0.02%, react at 80 ℃ to obtain Polyurethane prepolymer A;

[0012] 2) Stir sodium ethylenediaminoethanesulfonate, crosslinking agent trimethylolpropane, and polyurethane prepolymer A in a mass ratio of 1:0.05:25, react at 65°C to obtain polymer B, and then Add hydroxyethyl acrylate to polymer B and react for 0.5h to obtain polyurethane C, wherein the mass ratio of polymer B to hydroxyethyl acrylate is 100:1.15;

[0013] 3) Cool down to 30°C, add water and ammonia to polyurethane C, wherein the mass ratio of polyurethane C, water and ammonia is 1:1.3:0.005, and emulsify under shear to obtain polyurethane emulsion D;

[0014] 4) After methyl acrylate and polyurethane emulsion D are mixed uniformly at a mass ratio of 1:15, water-soluble initiator ammonium persulfate is added dropwise in the mixed ...

Embodiment 2

[0015] Example 2: 1) First, mix toluene diisocyanate and polytetrahydrofuran diol uniformly at a mass ratio of 1: 1.3, then add 0.04% dibutyltin dilaurate of the mixture, and react at 75°C to obtain a polyurethane prepolymer A;

[0016] 2) Stir 1,4-butanediol-2-sodium sulfonate, crosslinking agent trimethylolpropane and polyurethane prepolymer A according to the mass ratio of 1:0.08:15, and react at 75°C to obtain polymerization Material B, and then add hydroxyethyl acrylate to polymer B to react for 2h to obtain polyurethane C, wherein the mass ratio of polymer B to hydroxyethyl acrylate is 100:1.8;

[0017] 3) Cool down to 15°C, add water and sodium hydroxide to polyurethane C, wherein the mass ratio of polyurethane C, water and sodium hydroxide is 1:1.5:0.015, and emulsify under shear to obtain polyurethane emulsion D;

[0018] 4) After mixing methyl methacrylate and polyurethane emulsion D uniformly at a mass ratio of 1:10, add water-soluble initiator potassium persulfate...

Embodiment 3

[0019] Embodiment 3: 1) First, mix hexamethylene diisocyanate and polycaprolactone diol in a mass ratio of 1:1.6, then add dibutyltin dilaurate with a mass of 0.008% of the mixture, at 78°C React to obtain polyurethane prepolymer A;

[0020] 2) Stir dimethylolpropionic acid, crosslinking agent trimethylolpropane and polyurethane prepolymer A in a mass ratio of 1:0.1:18, react at 68°C to obtain polymer B, and then acrylic acid Hydroxyethyl ester was added to polymer B and reacted for 1 hour to obtain polyurethane C, wherein the mass ratio of polymer B to hydroxyethyl acrylate was 100:1;

[0021] 3) Cool down to 35°C, add water and sodium carbonate to polyurethane C, wherein the mass ratio of polyurethane C, water and sodium carbonate is 1:1.2:0.03, and emulsify under shear to obtain polyurethane emulsion D;

[0022] 4) After mixing ethyl acrylate and polyurethane emulsion D uniformly at a mass ratio of 1:20, add water-soluble initiator ammonium persulfate-sodium sulfite dropwi...

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PUM

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Abstract

The invention discloses a preparation method of a waterborne polyurethane adhesive, comprising the following steps: evenly mixing vulcabond and polyglycols, adding in proper amount of catalyst, and reacting so as to obtain polyurethane prepolymer; reacting by adding in hydrophilic chain extender and crosslinking agent, adding 2-hydroxyethyl acrylate into the reaction system so as to obtain polyurethane, terminal group of which is double bond; reducing temperature, neutralizing and emusifying by adding in water under high-speed cutting so as to obtain polyurethane emulsion; and heating up, adding vinyl monomer into the emulsion, and polymerizing initiated by water-soluble initiator so as to obtain the modified waterborne polyurethane emulsion. The invention can completely eliminate the harmful effect to the application and the environment protection of the polyurethane emulsion product caused by small molecular emulsifier and organic solvent. The invention can make full use of combination property through the copolymerization modification between the polyurethane and polyacrylic ester.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, in particular to a preparation method of a water-based polyurethane adhesive. Background technique [0002] my country has become the largest shoe-making country in the world. At present, my country's shoe-making industry mainly uses solvent-based neoprene adhesives and polyurethane adhesives to bond shoe materials. Less dosage, good initial tack, cold bonding, and cheap price are its advantages, but these traditional adhesives contain volatile organic compounds (VOCs) and benzene-based toxic solvents, which have problems such as environmental pollution and safety hazards, and damage The health of the operators is a fatal shortcoming, and it has not adapted to the requirements of the development of the shoemaking industry. With the advancement of science and technology and the stricter requirements of laws and regulations related to environmental protection, the research and development of envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/72C08G18/12
Inventor 赖小娟沈一丁王磊刘敬松马晓宇刘敏
Owner SHAANXI UNIV OF SCI & TECH
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