Method for preparing water-based urethane acrylate pressure-sensitive adhesive

A urethane acrylate and pressure-sensitive adhesive technology, applied in the directions of graft polymer adhesives, adhesive types, adhesives, etc. It is difficult to completely polymerize and other problems to achieve the effects of reducing industrial costs, improving solvent resistance and improving conversion rate.

Active Publication Date: 2013-04-10
JIANGSU HONGYUAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that it is difficult to completely polymerize the acrylic acid monomer after it is added, and the residual amount of acrylic acid monomer in the emulsion is large, which does not meet the production requirements of the clean process

Method used

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  • Method for preparing water-based urethane acrylate pressure-sensitive adhesive
  • Method for preparing water-based urethane acrylate pressure-sensitive adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: (where: R 1 The value is 1.2, R 2 The value is 1, the mass fraction of DMPA is 8%, the neutralization degree is 100%, and the mass fraction of acrylate is 90%)

[0031] (A) Preparation of aqueous polyurethane emulsion

[0032] Take 0.025mol of polypropylene glycol-1000 (PPG-1000) and 0.022mol of dimethylolpropionic acid (DMPA) into a four-neck flask equipped with stirring and raise the temperature to 140°C, dehydrate, and after about 10min, cool down to 60°C , add 0.0564mol of TDI, raise the temperature to 80°C, keep the temperature for 2.5h, stop heating, naturally cool down to 70°C, add 1.222g of hydroxypropyl acrylate (HPA), and react for about 2h. After the end-capping reaction, add methyl ethyl ketone to adjust the viscosity, the mass of methyl ethyl ketone is 60% of the mass of polypropylene glycol, add 0.022mol triethylamine, stir for about 10 minutes, add polyurethane prepolymer to 155g water for dispersion and chain extension for about 2 hours, and...

Embodiment 2

[0035] Example 2: (where R 1 The value is 1.4, R 2 The value is 1, the mass fraction of DMBA is 7%, the neutralization degree is 80%, and the mass fraction of acrylate is 15%)

[0036] (A) Preparation of aqueous polyurethane emulsion

[0037]Take 0.025mol of polypropylene glycol-2000 (PPG-2000) and 0.022mol of dimethylol butyric acid (DMBA) into a four-neck flask equipped with stirring and raise the temperature to 160°C for dehydration. After about 15 minutes, cool down to 50°C , add 0.065mol of MDI, raise the temperature to 90°C, keep the temperature for 2h, stop heating, naturally cool down to 70°C, add 2.34g of hydroxyethyl methacrylate (HEMA), and react for about 2h. After the end-capping reaction, add acetone to adjust the viscosity, the mass of acetone is 70% of the mass of polypropylene glycol, add 0.0176mol dimethylethanolamine, stir for about 10min, add the polyurethane prepolymer to 158g of water for about 3h to disperse and extend the chain, and obtain a water-bas...

Embodiment 3

[0040] Example 3: (wherein R 1 The value is 1.4, R 2 The value is 1.1, the mass fraction of 1,4-butanediol-2-sodium sulfonate is 10.5%, the neutralization degree is 86%, and the mass fraction of acrylate is 45%)

[0041] (A) Preparation of aqueous polyurethane emulsion

[0042] Take 0.025mol of polyethylene glycol-2000 (PEG-2000) and 0.022mol of 1,4-butanediol-2-sodium sulfonate into a four-necked flask equipped with stirring and heat up to 150°C, dehydrate, after about 10min , cool down to 65°C, add 0.065mol of hexamethylene diisocyanate (HDI), raise the temperature to 85°C, keep the temperature for 2.5h, stop heating, naturally cool down to 70°C, add 1.17g of hydroxypropyl methacrylate (HPMA) , The reaction is about 3h. After the end-capping reaction, add tetrahydrofuran to adjust the viscosity. The mass of tetrahydrofuran is 80% of the mass of polyethylene glycol. Add 0.0189mol diethanolamine and stir for about 20 minutes. Add the polyurethane prepolymer to 157g water fo...

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Abstract

The invention provides a method for preparing water-based urethane acrylate pressure-sensitive adhesive. According to the method, water-based urethane is chemically modified by using acrylate, and the water-based urethane and the acrylate are combined with each other in a chemical bond form, so that the synthesized water-based urethane acrylate pressure-sensitive adhesive has excellent performance of the water-based urethane and the acrylate. According to the water-based urethane acrylate pressure-sensitive adhesive, water-based urethane acrylate copolymerization emulsion and tackifying resin are used as main components. The method comprises the following steps of: firstly, reacting a hydroxy monomer, a hydrophilic chain extender and polyisocyanate which are used as main raw materials to generate polyurethane prepolymer, and adding a hydroxy-containing acrylate monomer to obtain hydroxy-terminated polyurethane prepolymer; secondly, adding a salt-forming agent to neutralize the hydroxy-terminated polyurethane prepolymer, and dispersing in water to obtain water-based polyurethane emulsion; and finally, properly polymerizing the water-based polyurethane emulsion and the acrylate to obtain the water-based urethane acrylate copolymerization emulsion, and adding the tackifying resin of different mass fractions, thereby obtaining water-based urethane acrylate pressure-sensitive adhesive emulsion.

Description

technical field [0001] The invention belongs to the technical field of preparation of water-based adhesives, in particular to a preparation method of water-based polyurethane acrylate pressure-sensitive adhesives. Background technique [0002] Water-based polyurethane adhesives are an important category of water-based adhesives, which have excellent properties of polyurethane materials. Water-based polyurethane adhesives contain isocyanate groups and urethane groups with strong polarity and high chemical activity, so that they have excellent chemical adhesion, do not pollute the environment, and have wider and wider application fields and uses. However, its high temperature resistance, water resistance and outdoor aging resistance are poor. Acrylic ester (PA) has good water resistance, weather resistance and outdoor aging resistance, but poor low temperature performance. Utilizing the complementary properties of water-based polyurethane and acrylate, acrylate is used to mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/08C08F290/06C08G18/67
Inventor 李坚孙建平张旸
Owner JIANGSU HONGYUAN NEW MATERIAL TECH
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