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Preparation method of waterborne polyurethane with strong water resistance

A technology of water-based polyurethane and water resistance, which is applied in the chemical industry to achieve the effect of improving water resistance and good water resistance

Inactive Publication Date: 2012-12-26
QINGDAO WINCHANCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] with 2,6 toluene diisocyanate (TDI), polyethylene glycol (PEG3000), 1,4-butanediol (BDO), dimethylolpropane For water-based polyurethane prepared from acid (DMPA), the water absorption rate and volume expansion rate of the film-forming material increase with the increase of the amount of ionic hydrophilic monomer, which is not conducive to further application.
[0003]Acrylic resin has good aging resistance, yellowing resistance, water resistance, etc., and the coating based on acrylic resin has gloss retention, color retention and weather resistance , Strong adhesion and other advantages, but at the same time there are disadvantages such as poor solvent resistance, hot stickiness and cold brittleness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] As in the above step (4), the consumption of tripropylene glycol diacrylate (TPGDA) is 10% of the total mass of the prepolymer, and the obtained emulsion is slightly yellow, with good stability, water absorption rate of 4.95%, and tensile strength of 21.21MPa , The elongation at break is 680%.

Embodiment 2

[0028] As in the above step (4), the consumption of tripropylene glycol diacrylate (TPGDA) is 20% of the total mass of the prepolymer, and the obtained emulsion is slightly yellow, with good stability, water absorption rate of 3.9%, and tensile strength of 23.58MPa , The elongation at break is 650%.

Embodiment 3

[0030] As in the above step (4), the consumption of tripropylene glycol diacrylate (TPGDA) is 30% of the total mass of the prepolymer, and the obtained emulsion is slightly yellow, with good stability, water absorption rate of 3.5%, and tensile strength of 25.72MPa , The elongation at break is 500%.

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Abstract

Provided is a preparation method of waterborne polyurethane with strong water resistance. A prepolymer is prepared based on the raw materials of toluene diisocyanate (TDI), polyethylene glycol 3000 (PEG 3000), butanediol (BDO), and dimethylol propiconic acid (DMPA). Hydroxyethyl acrylate (HEA) is added for sealing one end of the prepolymer, namely isocyanate (NCO). Triethylamine is added to be neutralized to produce salt. Tripropylene glycol diacrylate (TPGDA) is added to emulsify with water. A proper initiating agent, namely azobisisobutyronitrile, is added. Therefore, double bonds of the TPGDA and HEA are opened to produce emulsions formed by copolymerization modification of acrylic ester and the waterborne polyurethane. The waterborne polyurethane produced according to the preparation method has strong water resistance after film formation.

Description

technical field [0001] The invention relates to a preparation method of strong water-resistant water-based polyurethane, which belongs to the field of chemical industry. Background technique [0002] Waterborne polyurethane prepared from 2,6 toluene diisocyanate (TDI), polyethylene glycol (PEG3000), 1,4-butanediol (BDO), dimethylol propionic acid (DMPA) as raw materials, and its film-forming material The water absorption rate and volume expansion rate all increase with the increase of the amount of ionic hydrophilic monomer, which is not conducive to further application. [0003] Acrylic resin has good aging resistance, yellowing resistance, water resistance, etc., and the coating based on acrylate resin has the advantages of gloss retention, color retention, weather resistance, strong adhesion, etc., but at the same time, it has poor solvent resistance and heat Sticky, cold and brittle. [0004] It can be seen that water-based polyurethane and acrylate have strong comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/67C08G18/66
Inventor 苏建丽
Owner QINGDAO WINCHANCE TECH