Preparation method of anionic organic-solvent-free and emulsifier-free polyurethane microemulsion

An anionic, organic solvent technology, applied in the direction of adhesives, adhesive types, grafted polymer adhesives, etc., can solve problems such as insufficient hardness and tensile strength, poor stain resistance, and poor solvent resistance. Achieve the effects of short surface drying time, cost saving and high solid content

Inactive Publication Date: 2013-03-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is no chemical bond cross-linking between latex particles, which belongs to thermoplastic coating film, which has poor solvent resistance, poor stain resistance, hardness and tensile strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) First, add 7 parts of polymer polyol to the dry reactor in parts by mass, and degas it in vacuum at 110°C for 2 hours, then pass in nitrogen, and cool down to 60°C;

[0023] 2) Next, add 8 parts of isocyanate monomer to the reactor under stirring, react for 1 hour, then add 10 parts of vinyl monomer, 3 parts of anionic hydrophilic chain extender and 0.005 parts of catalyst , continue to incubate at 60°C for 3 hours;

[0024] 3) Then, add 0.5 parts of functional monomer, react for 0.5 hours, then cool the system temperature to 30°C, then add 5 parts of alkali salt-forming agent and 80 parts of water, stir and disperse for 0.5 hours, and then heat up to 80°C;

[0025] 4) Finally, add 0.2 parts of the initiator aqueous solution, and continue the heat preservation reaction for 4 hours, that is, an anionic organic solvent-free and emulsifier-free polyurethane-polyacrylic acid microemulsion with yellowish bluish light is obtained. The average particle size of the prepared m...

Embodiment 2

[0035] 1) First, add 13 parts of polymer polyol to the drying reactor in parts by mass, and vacuum degassing at 112°C for 2 hours, then inject nitrogen, and cool down to 70°C;

[0036] 2) Next, add 8.5 parts of isocyanate monomer into the reactor under stirring, react for 1.5 hours, then add 13 parts of vinyl monomer mixture, 3 parts of anionic hydrophilic chain extender and 0.008 parts of Catalyst, continue to react at 70°C for 3.5 hours;

[0037] 3) Then, add 1 part of functional monomer, react for 1 hour, then cool the system temperature to 50°C, then add 3 parts of alkali salt-forming agent and 110 parts of water, stir and disperse for 0.5 hours, and then heat up to 80°C;

[0038] 4) Finally, add 0.5 parts of initiator aqueous solution and continue to keep warm for 3 hours to prepare a yellowish bluish anionic non-organic solvent-free emulsifier-free polyurethane-polyacrylic acid microemulsion. The average particle size of the prepared emulsion is 69.63 nm.

[0039] The...

Embodiment 3

[0048] 1) First, add 5 parts of polymer polyol to the drying reactor in parts by mass, and vacuum degassing at 114°C for 1.5 hours, then inject nitrogen, and cool down to 60°C;

[0049] 2) Next, add 7.5 parts of isocyanate monomer mixture to the reactor, react for 2 hours, then add 9 parts of vinyl monomer, 2.5 parts of anionic hydrophilic chain extender and 0.01 part of catalyst in sequence, continue Insulate and react at 60°C for 3 hours;

[0050] 3) Then, add 2 parts of functional monomer, react for 0.5 hours, then cool the system temperature to 40°C, then add 2.5 parts of alkali salt-forming agent and 75 parts of water, stir and disperse for 0.5 hours, and then heat up to 80°C;

[0051] 4) Finally, add 1 part of the aqueous solution of the initiator and continue the heat preservation reaction for 6 hours to obtain a yellowish bluish anionic non-organic solvent-free emulsifier-free polyurethane-polyacrylic acid microemulsion, and the average particle size of the prepared e...

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Abstract

The invention discloses a preparation method of an anionic organic-solvent-free and emulsifier-free polyurethane microemulsion. The preparation method comprises the following steps of: carrying out polymerization of isocyanate and polymer polyol by replacing an organic cosolvent used in the preparation process of the traditional polyurethane-polyacrylate microemulsion with inertial vinyl monomers to prepare a polyurethane prepolymer of which the terminal group is provided with unsaturated bonds, carrying out cooling, neutralization and aqueous dispersion on the polyurethane prepolymer, and then further initiating the polymerization of the vinyl monomers under the action of a water-soluble initiator to prepare the anionic organic-solvent-free and emulsifier-free polyurethane microemulsion. The preparation method disclosed by the invention thoroughly gets rid of the organic cosolvent added in the traditional waterborne polyurethane and achieves a real sense of environmental friendliness; and in addition, no emulsifier is added in the preparation process, and the prepared anionic organic-solvent-free and emulsifier-free polyurethane microemulsion has nano-scale particle diameter, is excellent in performance and can be used for a waterborne coating and the field of adhesives due to formula adjustment.

Description

technical field [0001] The invention relates to a method for preparing an anionic organic solvent-free and emulsifier-free polyurethane microemulsion. Background technique [0002] Today, volatile organic compounds (VOC) have become the third largest source of air pollution after automobile exhaust and smog. Therefore, materials with low toxicity and environmental friendliness have become research hotspots at home and abroad. Water-based polyurethane is a polyurethane emulsion that uses water as the dispersion medium. In addition to the excellent performance of solvent-based polyurethane, it also has the advantages of non-flammable, non-toxic, and non-environmental pollution during construction. The product has been successfully used in the adhesive and coating industries. . However, there are still many problems in the synthesis and application of water-based polyurethane emulsions. For example, due to the high surface tension and high heat enthalpy of medium water, water-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F2/22C08G18/67C08G18/66C08G18/65C09D151/08C09J151/08
Inventor 王海花邹婧沈一丁费贵强牟静
Owner SHAANXI UNIV OF SCI & TECH
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