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Polyurethane water dispersion and its preparing method

A water-based dispersion, polyurethane technology, applied in the field of coatings, can solve problems such as short activation period, and achieve the effects of improving cross-linking degree, increasing viscosity, and increasing water resistance

Inactive Publication Date: 2003-06-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of external linking agents has disadvantages such as short pot life, and other cross-linking modifications such as heat-activated cross-linking and ultraviolet light cross-linking require drying equipment, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Polyurethane aqueous dispersion, its component is listed in table 2.

[0034] Table 2 Self-crosslinking modified water-based polyurethane emulsion component mass percentage 1 polyether polyol (N210) 242 polyester polyol (T1136) 103 toluene diisocyanate (TDI) 454 dimethylol propionic acid (DMPA) 65 diglycol Alcohol (DEG) 66 Trimethylolpropionic acid (TMP) 27 Triethylamine (TEA) 4.08 Ethylenediamine (EDA) 0.89 Capture agent (hydrazine) 0.410 Deionized water 150.0

[0035] Under the protection of dry nitrogen, add the dehydrated polyether diol N210, polyester diol T1136 and TDI into a 1000ml four-necked flask equipped with a thermometer, stirring device and reflux condenser, and react at 70°C-80°C for 2 hours, then add diethylene glycol and react at 75°C for 1 hour, and use the n-butylamine titration method to determine the end point of the reaction. After reaching the end point, add NMP solution and trimethylolpropane dissolved in dimethylolpropionic acid (DMPA),...

Embodiment 2

[0038] The self-crosslinking modified polyurethane emulsion was prepared by reacting polyester polyol and aliphatic diisocyanate. The raw materials used are listed in Table 3.

[0039] Table 3 Self-crosslinking modified water-based polyurethane emulsion component mass percentage 1 polyester polyol (T1136) 46.32 isophorone diisocyanate (IPDI) 35.93 butanediol (BDO) 6.04 dimethylol propionic acid (DMPA) 5.05 Epoxy resin (E-44) 6.06N methylpyrrolidone 10.07 triethylamine (TEA) 4.08 ethylenediamine (EDA) 0.89 capture agent (hydrazine) 0.410 deionized water 150.0

[0040] Under the protection of dry nitrogen, the dehydrated polyester diol and IPDI were added to a 1000ml four-necked flask equipped with a thermometer, a stirring device and a reflux condenser, and reacted at 70°C-80°C for 2 hours, then added butanediol in React at 70°C-80°C for 1 hour, and use n-butylamine titration to determine the end point of the reaction. After reaching the end point, add NMP solution ...

Embodiment 3

[0045] Self-crosslinking modified waterborne polyurethane emulsion was prepared by reacting castor oil with MDI. The raw materials and components used are listed in Table 5.

[0046] Table 5 Self-crosslinking modified water-based polyurethane emulsion component mass percent 1 castor oil 352 diphenylmethane diisocyanate (MDI) 423 hexanediol (HDO) 454 dimethylol propionic acid (DMPA) 65 triethylamine (TEA ) 4.06 ethylenediamine (EDA) 0.87 capture agent (hydrazine) 0.48 deionized water 150.0

[0047] Under the protection of dry nitrogen, the dehydrated castor oil and MDI were added to a 1000ml four-necked flask equipped with a thermometer, a stirring device and a reflux condenser, and reacted at 70°C-80°C for 2 hours, then added hexanediol at 70°C React at ℃-80℃ for 1 hour, and use n-butylamine titration method to determine the end point of the reaction. After reaching the end point, add NMP solution dissolved in dimethylolpropionic acid (DMPA) and trimethylolpropane, ...

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Abstract

The present invention relates to paint and is especially aqueous polyurethane dispersion and its preparation process. The preparation process includes: vacuum dewatering of polyol at 90-120 deg.c vacuum degree 0.05-0.1 MPa for 1.0-2.0 hr before cooling; adding polyol and diisocyanate monomer, heating to 60-100 deg.c for 1.0-2.0 hr, adding small molecular dibasic alcohol as chain expander, reaction at 60-80 deg.c until reaching required NCO group content, adding hydrophilic chain expander and reaction at 50-70 deg.c to unchanged NCO group content to obtain polyurethane prepolymer; cooling the prepolymer, neutralizing with neutralizing agent, transferring the product to emulsifying reactor, high speed emulsifying while adding deionized water, adding amine to expand chain, adding NCO group collecting agent and defoaming agent for stabilizing treatment, and eliminating acetone.

Description

technical field [0001] The invention relates to the field of coatings, in particular to aqueous polyurethane dispersions. [0002] The present invention also relates to a preparation method of the polyurethane aqueous dispersion. technical background [0003] The main component of the polyurethane aqueous dispersion coating, the existing polyurethane aqueous dispersion has poor chemical resistance and solvent resistance, low hardness, low surface gloss, and the self-thickening property of the polyurethane aqueous dispersion is poor, the solid content is low, The water resistance of latex film is poor, which limits its wide application. Common modification methods include polysiloxane modification and acrylate modification, etc., as described in US Patents USP6063861 (2000), USP6239209 (2001) and USP6197874 (2001). The modification of polysiloxane requires active amino groups or hydroxyl groups on the molecular structure of the siloxane, which is difficult to introduce into...

Claims

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Application Information

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IPC IPC(8): C09D175/04
Inventor 瞿金清沈慧芳陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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