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Preparation method of tung oil anhydride ester polyol modified waterborne polyurethane emulsion

A technology of tung oil anhydride ester and water-based polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., to achieve the effect of improving poor solvent resistance and increasing crosslinking density

Inactive Publication Date: 2016-09-28
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of modifying water-based polyurethane with tung oil anhydride ester polyols has not been reported in the literature

Method used

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  • Preparation method of tung oil anhydride ester polyol modified waterborne polyurethane emulsion
  • Preparation method of tung oil anhydride ester polyol modified waterborne polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0024] Add 10 g of polyoxypropylene glycol (PPG) into the reactor, and vacuum dehydrate at 110 °C for 1 h. 28.7 g of acetone was added, and 6.2 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), then add dropwise 1.2 g dimethylolpropionic acid (DMPA), 0.3 g 1,4-butanediol (BDO) and 2.4 g oleic acid-maleic anhydride A mixture of three 1,2-propanediol esters was reacted for 4 h. After cooling down to 40°C, 0.9 g of triethylamine was added and reacted for 20 min. After the temperature was lowered to 40°C, 28.3 g of deionized water was added under high-speed stirring, emulsified and dispersed for 30 minutes, and then the acetone was removed under reduced pressure to obtain tungoleic anhydride ester polyol-modified waterborne polyurethane emulsion.

Embodiment example 2

[0026] Add 10 g of polycarbonate diol (PCDL) into the reactor, and vacuum dehydrate at 110 °C for 1 h. 30.2 g of acetone was added, and 9.8 g of diphenylmethane diisocyanate (MDI) was added dropwise at 60°C for 1 h of reaction. Add 1 drop of catalyst dibutyltin dilaurate (DBTDL), dropwise add 1.5 g dimethylolacetic acid, 0.2 g diethylene glycol (DEG) and 2.6 g oleic acid-maleic anhydride adduct III 1,4 - Butanediol ester mixture, reacted for 4 h. After cooling down to 40°C, 1.3 g of triethylamine was added and reacted for 20 minutes. After the temperature was lowered to 40°C, 28.8 g of deionized water was added under high-speed stirring, emulsified and dispersed for 30 minutes, and the acetone was removed under reduced pressure to obtain tungoleic anhydride ester polyol-modified waterborne polyurethane emulsion.

Embodiment example 3

[0028] Add 10 g of polyethylene adipate (PEA) into the reactor, and vacuum dehydrate at 110 °C for 1 h. 27.5 g of acetone was added, and 7.5 g of hexahydrotoluene diisocyanate (HTDI) was added dropwise at 60°C for 1 h of reaction. Add 1 drop of catalyst dibutyltin dilaurate (DBTDL), dropwise add 2.0 g of dimethylolbutyric acid (DMBA), 0.1 g of neopentyl glycol (NPG) and 1.9 g of tungoleic acid-maleic anhydride adduct Sanxin A mixture of pentylene glycol esters was reacted for 4 h. After cooling down to 40°C, 1.4 g of triethylamine was added and reacted for 20 min. After the temperature was lowered to 40°C, 29.6 g of deionized water was added under high-speed stirring, emulsified and dispersed for 30 minutes, and then the acetone was removed under reduced pressure to obtain tungoleic anhydride ester polyol-modified waterborne polyurethane emulsion.

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Abstract

The invention provides a method for preparing aqueous polyurethane emulsion modified by tung oil anhydride polyol, which is a process of preparing the aqueous polyurethane emulsion modified by the tung oil anhydride polyol, with polyisocyanate, oligomer polyol, a small molecule chain extender, a hydrophilic chain extender and a salt forming agent triethylamine as main raw materials, and with tung oil anhydride polyol as a modifier. The tung oil anhydride polyol contains 3 hydroxyl groups, and reacts with isocyanate to form a polyurethane chain segment with a branched chain, to play a role of an inner cross-linking agent; meanwhile, an eleostearic acid group is introduced into the aqueous polyurethane chain segment, a contained double bond can generate an oxidative cross-linking reaction in a subsequent film forming process, so as to increase the degree of cross-linking of coating, and perfect the defects of the existing aqueous polyurethane emulsion, such as poor solvent resistance, poor water resistance, insufficient mechanical properties and the like.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a preparation method of tung oil anhydride ester polyol 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 solvent resistance, poor water resistance, and insufficient mechanical properties, which severely limit its application range. Therefore, the modification of waterborne polyurethane has become a research hotspot in this field. [0003] Among various waterborne polyurethane modification methods, internal crosslinking modific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/34C08G18/32C08G18/67C08G18/44C08G18/42C08G18/75C08G18/73
CPCC08G18/10C08G18/36C08G18/6696C09D175/14
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