Preparation method of epoxidized castor oil modified water-borne polyurethane

A technology of water-based polyurethane and epoxidized castor, which is applied in the field of preparation of water-based polyurethane, can solve the problems of poor performance such as water resistance, chemical resistance, and weather resistance, and achieve the effect of improved performance and excellent biodegradability

Inactive Publication Date: 2011-02-09
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the present invention provides a method for preparing water-based polyurethane modified by epoxidized castor oil, which alleviates the dependence of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] raw material:

[0037] 35.0g polyether polyol

[0038] 33.0g hexamethylene diisocyanate (HDI)

[0039] 3.5g dimethylolpropionic acid (DMPA)

[0040] 0.03g dibutyltin dilaurate (DBTDL)

[0041] 3.8g 1,4-butanediol

[0042] 40.0g epoxidized castor oil

[0043] 32.0g acetone

[0044]4.1g triethylamine (TEA)

[0045] 3.0g ethylenediamine (EDA)

[0046] 200.0g deionized water

[0047] Add polyether polyols and DMPA to a glass reactor equipped with an electric stirrer, reflux condenser, and thermocouple thermometer. After vacuuming at 100°C for 90 minutes, cool down to about 70°C and add HDI, then add DBTDL dropwise. The reaction was stirred at 70°C for 4 hours to obtain a prepolymer. Add 1,4-butanediol, epoxidized castor oil and acetone to the prepolymer, stir and react at 60° C. for 3 hours to obtain a modified polyurethane prepolymer. After cooling the modified polyurethane prepolymer to 50°C, add TEA to neutralize it and form a salt. The prepolymer obtained aft...

Embodiment 2

[0049] raw material:

[0050] 30.0g polyester polyol

[0051] 32.5g isophorone diisocyanate (IPDI)

[0052] 6.5g dimethylolacetic acid

[0053] 0.1g stannous octoate

[0054] 8.0g ethylene glycol

[0055] 35.0g epoxidized castor oil

[0056] 42.0g acetone

[0057] 9.2g ammonia water

[0058] 1.8g p-phenylenediamine

[0059] 289.0g deionized water

[0060] In a glass reactor equipped with an electric stirrer, a reflux condenser, and a thermocouple thermometer, add polyether polyols and dimethylolacetic acid, vacuumize at 105°C for 60 minutes, cool down to about 80°C, add IPDI, drop Add stannous octoate and react with stirring at 80°C for 3 hours to obtain a prepolymer. Add ethylene glycol, epoxidized castor oil and acetone to the prepolymer, stir and react at 70°C for 2 hours to obtain a modified polyurethane prepolymer. After cooling the modified prepolymer to 55°C, add ammonia water to neutralize and form a salt. The prepolymer obtained after neutralization was she...

Embodiment 3

[0062] raw material:

[0063] 40.2g polyether polyol

[0064] 36.3g 4,4'-diphenylmethane diisocyanate (MDI)

[0065] 7.8g dimethylolbutyric acid (DMBA)

[0066] 0.1g tetramethylbutylene diamine

[0067] 6.4g 1,4-butanediol

[0068] 30.0g epoxidized castor oil

[0069] 50.0g acetone

[0070] 6.8g sodium hydroxide

[0071] 1.6g diethylenetriamine

[0072] 264.6g deionized water

[0073] In a glass reactor equipped with an electric stirrer, a reflux condenser, and a thermocouple thermometer, add polyether polyols and DMBA, vacuumize at 110°C for 30 minutes, cool down to about 75°C, add MDI, and drop tetramethyl Butanediamine was stirred and reacted at 75°C for 3 hours to obtain a prepolymer. Add 1,4-butanediol, epoxidized castor oil, epoxidized castor oil and acetone to the prepolymer, stir and react at 70° C. for 2 hours to obtain a modified polyurethane prepolymer. After cooling the modified polyurethane prepolymer to 45°C, add sodium hydroxide to neutralize it and fo...

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Abstract

The invention discloses a preparation method of epoxidized castor oil modified water-borne polyurethane, which relieves the degree of dependence on petroleum resources of the water-borne polyurethane, and simultaneously overcomes the defects poor product water resistance, poor chemical resistance, poor weathering resistance and the like of the existence of water-borne polyurethane. The technical scheme is that the preparation method comprises the following steps of: (1) preparing polyurethane prepolymer from isocyanate, polyether or polyester polyol, a catalyst and a hydrophilic chain extender; (2) performing a secondary chain extension reaction on the prepolymer and an organic solvent mixture of a polyhydroxy compound and the epoxidized castor oil to prepare epoxidized castor oil modified prepolymer; (3) reacting the modified prepolymer with a salifying agent, and then performing neutralization and salifying; (4) adding the prepolymer after the salifying into deionized water for high-speed emulsification, and simultaneously adding a chain extender into the mixture for chain extension; and (5) performing distillation to remove the organic solvent to prepare an epoxidized castor oil modified water-borne polyurethane emulsion.

Description

technical field [0001] The present invention relates to a kind of preparation method of water-based polyurethane, more specifically relate to a kind of preparation method of epoxidized castor oil modified water-based polyurethane. Background technique [0002] Polyurethane is a high-functional resin, but a large amount of solvent is required in the synthesis process of traditional solvent-based polyurethane, and a lot of organic solvents need to be added in the construction process. pose a serious threat to the health of the patient. With the enhancement of people's awareness of environmental protection, countries began to limit the VOC content. Water-based polyurethane uses water instead of organic solvents as the dispersion medium, which has obvious environmental protection value and can be applied to coatings, adhesives, water-based leather finishing agents, fabric finishing agents, etc. ,More and more attention has been paid. [0003] Polyester (or polyether) polyol is...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/12C08G18/36
Inventor 蒋剑春史以俊罗振扬
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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