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Cation water polyurethane/acrylic ester composite emulsion and preparation method thereof

A water-based polyurethane and acrylate technology, which is applied in the field of cationic water-based polyurethane/acrylate composite emulsion and its preparation, can solve problems such as unfavorable environmental protection, energy consumption, cumbersome process, etc., and achieves improved solvent resistance, improved elongation at break and Elastomeric properties, the effect of improving hydrolytic stability

Active Publication Date: 2008-08-06
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional method of synthesizing water-based polyurethane mostly uses acetone or methyl ethyl ketone method. The use of organic solvents is not only not conducive to environmental protection, but also needs to be removed by distillation. The process is cumbersome and consumes energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dehydrate 41.34g of polytetrahydrofuran (Mn=2000) at 110-120°C with a vacuum degree of 0.09MPa for 1h, then add it into a three-necked flask equipped with a thermometer, a stirring rod, and a reflux condenser, and pass N 2 Protection, constant temperature to 70°C, add 12.13g solid MDI (4,4-MDI content is 98%) and 1.34g carbodiimide modified diphenylmethane diisocyanate, add 0.10g dibutyltin diisocyanate half an hour later Laurate, react at 80°C for 2h, cool to 55°C, add an appropriate amount of methyl methacrylate to dilute to a solid content of 70%, condense and reflux, add 2.40g N-methyldiethanolamine (N-MDEA, dissolve with a small amount of butanone ), react for 1h. Lower the temperature of the reactor to below 45°C, add 0.86g of methacrylic acid, react for 0.5h, and at the same time add 5% dilute hydrochloric acid to adjust the pH to 5~6. The prepolymer was cooled to room temperature, and 250 g of deionized water was added at a uniform speed, and a water-based poly...

Embodiment 2

[0033]Dehydrate 77.65g of polytetrahydrofuran (Mn=4000) at 110-120°C with a vacuum degree of 0.09MPa for 1h, then add it into a three-necked flask equipped with a thermometer, a stirring bar, and a reflux condenser, and pass N 2 Protection, constant temperature to 70°C, add 11.21g solid MDI (2,4-MDI content is 47%) and 1.00g carbodiimide modified diphenylmethane diisocyanate, add 0.10g dibutyltin diisocyanate half an hour later Laurate, reacted at 80°C for 2h, cooled to 55°C, added an appropriate amount of methyl methacrylate to dilute to a solid content of 75%, condensed and refluxed, added 2.58g of N-methyldiethanolamine (N-MDEA, dissolved with a small amount of butanone ), react for 1h. Lower the temperature of the reactor to below 45°C, add 1.25g of methacrylic acid, react for 0.5h, and at the same time add 5% dilute hydrochloric acid to adjust the pH to 5~6. The prepolymer was cooled to room temperature, and 450 g of deionized water was added at a uniform speed, and a wa...

Embodiment 3

[0035] Dehydrate 40.00g of polyethylene glycol (Mn=1000) at 110-120°C with a vacuum degree of 0.09MPa for 1h, then add it into a three-necked flask equipped with a thermometer, a stirring bar, and a reflux condenser, and pass N 2 Protection, constant temperature to 70°C, add 15.88g solid MDI (4,4-MDI content is 98%) and 1.38g carbodiimide modified diphenylmethane diisocyanate, add 0.10g dibutyltin diisocyanate half an hour later Laurate, react at 80°C for 2h, cool to 55°C, add an appropriate amount of methyl methacrylate to dilute to a solid content of 70%, condense and reflux, add 2.65g of N-methyldiethanolamine (N-MDEA, dissolve with a small amount of butanone ) and 0.90g 1.4-butanediol, reacted for 1h. Lower the temperature of the reactor to below 45°C, add 0.86g of methacrylic acid, react for 0.5h, and at the same time add 5% dilute hydrochloric acid to adjust the pH to 5~6. The prepolymer was cooled to room temperature, and 300 g of deionized water was added at a uniform...

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PUM

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Abstract

The invention relates to cationic water-based polyurethane / acrylic ester composite emulsion and the preparation process, belonging to the chemical product and preparation technology field. Raw materials comprise diisocyanate mixture, polyhydric alcohol, organotin catalyst, chain extender, thinner, neutralizing agent and initiating agent. The preparation process comprises adding polyhydric alcohol into a reactor to dehydrate in vacuum, adding into diisocyanate mixture and organotin catalyst, conducting prepolymerization reaction to synthesize prepolymer with isocyanate-termi-nated, coldly adding thinner to dilute and to condense and reflow, adding chain extender to obtain mixture through chain extending reaction, cooling down, adding neutralizing agent to finish salt-forming reaction, regulating pH value, adding deionized water to conduct dispersed emulsification to obtain cationic water-based polyurethane elusion, and heating up and adding initiating agent to initiate free radical polymerization reaction to prepare composite elusion. The cationic water-based polyurethane / acrylic ester composite emulsion is synthesized through adopting non solvent process with low pollution and environment-friendly, increases solvent resistance, water resistance and tensile strength of glue film through introducing micro-cross-linked structure, increases hydrolytic stability of the glue film through introducing carbodiimide structure, and increases elongation at break and elasticity property through of glue film through introducing 2, 4-MDI.

Description

technical field [0001] The invention relates to a cationic water-based polyurethane / acrylate composite emulsion and a preparation method thereof, and belongs to the technical field of chemical products and preparation methods thereof. Background technique [0002] Water-based polyurethane is relative to solvent-based polyurethane, which is a binary colloid system in which polyurethane particles are dispersed in the continuous phase (water). Waterborne polyurethane uses water as the medium, good construction conditions, safe production and application, and has obvious environmental protection value. At the same time, water is cheap and easy to get, so it can significantly reduce product costs, so it has attracted more and more attention. [0003] Most of the original polyurethane emulsions used organic solvents as the dispersion medium. With the establishment of environmental protection regulations in various countries and the enhancement of environmental awareness, the emiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L33/04C08G18/76C08F220/10C08F2/22
Inventor 黄岐善张红王洪武于学丽丁建生
Owner WANHUA CHEM GRP CO LTD
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