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Preparation method and application of waterborne polyurethane film based on phthalic anhydride polyester polyalcohol

A technology of phthalic anhydride polyester polyol and phthalic anhydride polyester, which is applied in the field of organic membranes, can solve the problem of low benzene/cyclohexane separation factor, and achieve the effects of avoiding easy yellowing, high selectivity, and ensuring affinity

Inactive Publication Date: 2016-03-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the membrane material obtained in this study is too low for the separation factor of benzene / cyclohexane containing 54wt% benzene, the highest is only 2.7

Method used

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  • Preparation method and application of waterborne polyurethane film based on phthalic anhydride polyester polyalcohol
  • Preparation method and application of waterborne polyurethane film based on phthalic anhydride polyester polyalcohol
  • Preparation method and application of waterborne polyurethane film based on phthalic anhydride polyester polyalcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Polyphthalate-1,6-hexanediol (molecular weight: 2000) 15.03g, isophorone diisocyanate 7.4g, dimethylol propionic acid 1.1g, 1,4-butanediol 0.45 g, 0.17g of trimethylolpropane and 1 drop of catalyst dibutyltin dilaurate (about 0.05g) are stirred evenly in a three-necked flask equipped with a reflux condenser and a thermometer, and the stirring speed is kept at about 60-100rpm, and the reaction is stirred at 30°C After 2 hours, the temperature was raised to 75°C for 5 hours, the temperature was lowered to 40°C, 0.83 g of triethylamine was added, and the mixture was reacted at 40°C for 15 minutes. While stirring the product rapidly (stirring speed is about 200-300rpm), add 220g of deionized water at 10°C. Keep the stirring speed at 200-300rpm and mix for 10 minutes, add 0.3g of ethylenediamine as a chain extender to obtain a phthalic anhydride-based polyester polyol water-based polyurethane emulsion, and the solid content of the emulsion is about 10%. The emulsion was sal...

Embodiment 2

[0034] 21.69g of polyphthalate-1,6-hexanediol (molecular weight 2000), 7.4g of isophorone diisocyanate, 1.21g of dimethylol butyric acid, 0.15g of 1,4-butanediol g, 0.17g of trimethylolpropane and 1 drop of catalyst dibutyltin dilaurate (about 0.05g) are stirred evenly in a three-necked flask equipped with a reflux condenser and a thermometer, and the stirring speed is kept at about 60-100rpm, and the reaction is stirred at 40°C 1h, the temperature was raised to 85°C for 3h, the temperature was lowered to 30°C, 0.83g of triethylamine was added, and the reaction was carried out at 30°C for 30min. While stirring the product rapidly (stirring speed is about 200-300rpm), 95g of deionized water at 5°C was added. Keep the stirring speed at 200-300rpm and mix for 10 minutes, add 0.3g of ethylenediamine as a chain extender to obtain a phthalic anhydride-based polyester polyol water-based polyurethane emulsion, and the solid content of the emulsion is about 25%. The emulsion was saliv...

Embodiment 3

[0037] Poly-1,6-hexanediol phthalate (molecular weight 2000) 11.70g, isophorone diisocyanate 7.4g, dimethylol propionic acid 1.1g, 1,4-butanediol 0.6 g, 0.17g of trimethylolpropane and 1 drop of catalyst dibutyltin dilaurate (about 0.05g) are stirred evenly in a three-necked flask equipped with a reflux condenser and a thermometer, and the stirring speed is kept at about 60-100rpm, and the reaction is stirred at 40°C 1.5h, the temperature was raised to 80°C for 5h, the temperature was lowered to 40°C, 0.83g of triethylamine was added, and the reaction was carried out at 40°C for 20min. The product was stirred rapidly (the stirring speed was about 200-300 rpm), and 190 g of deionized water at 8° C. was added. Keep the stirring speed at 200-300rpm and mix for 10 minutes, add 0.3g of ethylenediamine as a chain extender to obtain a phthalic anhydride-based polyester polyol water-based polyurethane emulsion, and the solid content of the emulsion is about 10%. The emulsion was sali...

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Abstract

The invention provides a preparation method and application of a waterborne polyurethane film based on phthalic anhydride polyester polyalcohol. Under the conditions of mechanical stirring and reflux condensation, phthalic anhydride polyester polyalcohol, aliphatic diisocyanate, small-molecule dihydric alcohol with side chains containing carboxyl and small-molecule polyalcohol are gradually polymerized, then triethylamine is added, quaternary ammonium salt is formed through side chain carboxyl, a polyurethane prepolymer is obtained, the prepolymer is dispersed in deionized water under rapid stirring, chain extender diamine is added, and polyurethane emulsion is obtained; the polyurethane emulsion flows to form a film on the surface of a glass plate, the film is naturally aired and dried at the temperature of 120 DEG C to constant weight, and the waterborne polyurethane film based on phthalic anhydride polyester polyalcohol is obtained. The film can be used for separating benzene / cyclohexane through pervaporation.

Description

1. Technical field: [0001] The present invention relates to a kind of separation organic membrane, especially a kind of preparation method of waterborne polyurethane pervaporation membrane, specifically a kind of preparation method and application of waterborne polyurethane membrane based on phthalic anhydride polyester polyol. 2. Background technology: [0002] In the chemical industry, cyclohexane is usually produced by hydrogenation of benzene, so it is very important to separate the residual benzene in the cyclohexane product. However, benzene and cyclohexane are very close in terms of molecular size, polarity, physical and chemical properties, etc., and the difference in boiling point is very small (only 0.6°C), and they will form an azeotropic system and cannot be effectively separated by conventional distillation. Currently commonly used methods such as azeotropic distillation and extractive distillation generally have disadvantages such as high energy consumption, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/32C08G18/75C08G18/73C08G18/42C08J5/18
CPCC08G18/12C08G18/3228C08G18/324C08G18/3243C08G18/4211C08G18/664C08G18/6644C08G18/6659C08G18/73C08G18/755C08G18/758C08J5/18C08J2375/06
Inventor 姚路路朱昊崔鹏陈亚中
Owner HEFEI UNIV OF TECH
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