Preparation method of eleostearic acid monoglyceride modified waterborne polyurethane emulsion

A technology of water-based polyurethane and tung oleic acid, applied in the field of chemical synthesis, can solve the problems such as failure to achieve modification, complicated operation, long reaction time, etc., and achieve the effect of increasing the degree of cross-linking and improving the poor water resistance.

Inactive Publication Date: 2014-06-25
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long reaction time, high reaction temperature and cumbersome operation of vegetable oil alcoholysis, it is easy to cause the polymerization between double bonds and double bonds of vegetable oil itself, and the alcoholysis products are monoglycerides, diglycerides, mixtures of vegetable oils and glycerol, Adding it to the preparation process of water-based polyurethane will cause uneven molecular weight distribution of polyurethane, which will affect product quality and fail to achieve the expected effect of modification
At present, the method of modifying waterborne polyurethane with monoglyceride oleic acid has not been reported in the literature yet.

Method used

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  • Preparation method of eleostearic acid monoglyceride modified waterborne polyurethane emulsion
  • Preparation method of eleostearic acid monoglyceride modified waterborne polyurethane emulsion

Examples

Experimental program
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Effect test

Embodiment example 1

[0024] Add 10 g of polytetrahydrofuran glycol (PTMG) into the reactor, and vacuum dehydrate at 110 °C for 1 h. 27.7 g of acetone was added, and 6.0 g of toluene 2,4-diisocyanate (TDI) was added dropwise at 60° C. to react for 1 h. Add 1 drop of catalyst dibutyltin dilaurate (DBTDL), dropwise a mixture of 1.1 g dimethylolpropionic acid (DMPA), 0.3 g 1,4-butanediol (BDO) and 1.8 g oleic acid monoglyceride, React for 4 h. After cooling down to 40°C, 0.8 g of triethylamine was added and reacted for 20 min. After cooling down to 40°C, 27.4 g of deionized water was added under high-speed stirring, emulsified and dispersed for 30 min, and then the acetone was removed under reduced pressure to obtain oleic acid monoglyceride modified water-based polyurethane emulsion.

Embodiment example 2

[0026] Add 10 g of polyoxypropylene glycol (PPG) into the reactor, and vacuum dehydrate at 110 °C for 1 h. 23.4 g of acetone was added, and 7.4 g of isophorone diisocyanate (IPDI) was added dropwise at 60°C for 1 h of reaction. Add 1 drop of catalyst dibutyltin dilaurate (DBTDL), dropwise add a mixture of 1.7 g dimethylolbutyric acid (DMBA), 0.1 g diethylene glycol (DEG) and 1.3 g oleic acid monoglyceride, and react 4 h. After cooling down to 40°C, 1.1 g of triethylamine was added and reacted for 20 min. After cooling down to 40°C, add 25.9 g of deionized water under high-speed stirring, emulsify and disperse for 30 min, and remove the acetone under reduced pressure to obtain oleic acid monoglyceride modified water-based polyurethane emulsion.

Embodiment example 3

[0028] Add 10 g of polycarbonate diol (PCDL) into the reactor, and vacuum dehydrate at 110 °C for 1 h. 25.9 g of acetone was added, and 5.0 g of hexamethylene diisocyanate (HDI) was added dropwise at 60°C for 1 h of reaction. Add 1 drop of catalyst dibutyltin dilaurate (DBTDL), dropwise add a mixture of 1.3 g dimethylolacetic acid, 0.1 g ethylene glycol (EG) and 1.0 g oleic acid monoglyceride, and react for 4 h. After cooling down to 40°C, 1.3 g of triethylamine was added and reacted for 20 min. After cooling down to 40°C, add 25.9 g of deionized water under high-speed stirring, emulsify and disperse for 30 min, and remove the acetone under reduced pressure to obtain oleic acid monoglyceride modified water-based polyurethane emulsion.

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Abstract

The invention relates to a preparation method of eleostearic acid monoglyceride modified waterborne polyurethane emulsion. The preparation method is a process taking polyisocyanates, oligomer polyhydric alcohols, small molecule chain extender, hydrophilic chain extender and salt-forming agent of triethylamine as main raw materials and taking eleostearic acid monoglyceride as a modifying agent to prepare the eleostearic acid monoglyceride modified waterborne polyurethane emulsion. Surface tension of a film can be reduced by oleophilic long carbon aliphatic chain in an eleostearic acid monoglyceride structure, a double bond can be subjected to crosslinking reaction in the latter film formation process, the degree of crosslinking of the film is increased, and the defects of poor water resistance, poor solvent resistance, insufficient mechanical property, and the like of the existing waterborne polyurethane emulsion film are improved.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a preparation method of monoglyceryl oleic acid modified water-based polyurethane emulsion. Background technique [0002] Waterborne polyurethane is a binary colloidal system in which polyurethane particles are dispersed in water. It can not only achieve low VOC emissions required by environmental protection, but also retain some excellent properties of traditional solvent-based polyurethanes, such as good low-temperature flexibility, wear resistance and Excellent flex resistance, etc. However, water-based polyurethane has disadvantages such as poor water resistance, poor solvent resistance, and insufficient mechanical properties, which severely limit its application range. Therefore, it is necessary to modify waterborne polyurethane to improve its comprehensive performance. [0003] At present, the modification methods of waterborne polyurethane mainly include: epoxy resin mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/66C08G18/10C08G18/24
CPCC08G18/0823C08G18/0828C08G18/10C08G18/6659C08G18/6692C08G18/36
Inventor 周尽花皮少锋肖红波廖有为孙汉洲谭晓风章怀云杨晶李妮麻文杰蔡波夏勇
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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