Water dispersible hyperbranched polyisocyanate and preparation method thereof

A polyisocyanate and hyperbranched polyester technology, applied in the field of water-based curing agents, can solve the problems of hindering the popularization and application of water-based coatings and adhesives, and high cost of raw materials, and achieve the advantages of improving physical and chemical properties, reducing curing time, and reducing phase separation. Effect

Active Publication Date: 2014-07-02
武汉仕全兴聚氨酯科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw material cost of such products is high, and it is difficult to be accepted by the general p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Synthesis of hyperbranched polyester

[0019] Add 150g of dipentaerythritol and 40g of xylene in a four-necked flask equipped with a reflux condenser, stirrer, water separator, thermometer, and nitrogen protection, heat to reflux for dehydration, and then add 2660g of dimethylolpropane in batches acid and a small amount of p-toluenesulfonic acid as a catalyst, and react under reflux for 6-7 hours. When no more water distills out of the water separator, gradually increase the reaction temperature to 150-165 ° C, and further deepen the reaction by vacuuming for 1-2 hours. And remove remaining dimethylbenzene, obtain pale yellow hyperbranched polyester, the acid value of product is lower than 20mgKOH / g.

[0020] 2) Synthesis of hyperbranched polyisocyanate

[0021] Under nitrogen protection, 300g hyperbranched polyester and 75g propylene glycol methyl ether acetate (PMA solution) were added in the four-necked flask equipped with stirrer, reflux condenser, thermometer a...

Embodiment 2

[0025] 1) Synthesis of hyperbranched polyester

[0026] Add 150g of ditrimethylolpropane and 40g of xylene into a four-necked flask equipped with a reflux condenser, stirrer, water separator, thermometer, and nitrogen protection, heat to reflux for dehydration, and then add 2000g of di Methylolpropionic acid and a small amount of p-toluenesulfonic acid are used as catalysts, react under reflux for 6-7 hours, when no more water distills out of the water separator, gradually increase the reaction temperature to 150-165°C, and further deepen the reaction by vacuuming 1-2h, and remove the remaining xylene to obtain light yellow hyperbranched polyester, the acid value of the product is lower than 20mgKOH / g.

[0027] 2) Synthesis of hyperbranched polyisocyanate

[0028] Under nitrogen protection, 300g hyperbranched polyester and 75g4-methyl-2-pentanone are added in the four-necked flask equipped with agitator, reflux condenser, thermometer and dropping funnel, and the four-necked f...

Embodiment 3

[0032] 1) Synthesis of hyperbranched polyester

[0033] Add 150g of trimethylolpropane and 40g of xylene into a four-necked flask equipped with a reflux condenser, stirrer, water separator, thermometer, and nitrogen protection, heat to reflux for dehydration, and then add 1350g of dihydroxy Methylpropionic acid and a small amount of p-toluenesulfonic acid are used as catalysts to react under reflux for 6-7 hours. When there is no more water distilling out of the water separator, gradually increase the reaction temperature to 150-165°C, and further deepen the reaction by vacuuming 1 ~2h, and remove the remaining xylene to obtain light yellow hyperbranched polyester, the acid value of the product is lower than 20mgKOH / g.

[0034] 2) Synthesis of hyperbranched polyisocyanate

[0035] Under nitrogen protection, add 300g hyperbranched polyester and 75g propylene glycol diacetate into a four-necked flask equipped with a stirrer, reflux condenser, thermometer and dropping funnel, an...

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PUM

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Abstract

The invention discloses water dispersible hyperbranched polyisocyanate and a preparation method thereof. The preparation method comprises that hyperbranched polyester with different generation quantities is synthesized while polyalcohol is taken as a core molecule, dimethylolpropionic acid is taken as a monomer and dimethylbenzene is taken as a solvent, end group modification is carried out on the hyperbranched polyester, a high reactivity isocyanate group is introduced for synthesizing hyperbranched polyisocyanate, and then waterborne treatment is carried out on the hyperbranched polyisocyanate, so that the water dispersible hyperbranched polyisocyanate is obtained. The preparation method is low in production cost and simple in technological equipment, and the prepared water dispersible hyperbranched polyisocyanate has high functionality degree, high reactivity and low viscosity, can be dispersed in water and can be used for improving the physical and chemical properties of a coating when being applied to a waterborne alkyd paint, a waterborne polyurethane coating and a waterborne acrylic coating as a curing agent.

Description

technical field [0001] The invention relates to the technical field of water-based curing agents, more specifically, to a water-dispersed hyperbranched polyisocyanate and a preparation method thereof. Background technique [0002] With the establishment of environmental protection regulations in various countries and the enhancement of people's awareness of environmental protection, the emission of volatile organic compounds (VOC) in traditional solvent-based coatings and adhesives is becoming more and more restricted. Therefore, the development of low-pollution and environmentally friendly water-based coatings and adhesives Curing agent has become an important research and development direction. [0003] Water-dispersible polyisocyanate is usually used as a curing agent in adhesives and coatings based on water-based resins to form an external linking system and increase the cross-linking density of resin curing. Therefore, it is shown that the cured resin has good water re...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/48C08G18/38C08G18/32
CPCC08G18/0828C08G18/283C08G18/2865C08G18/3228C08G18/4283C08G63/06C08G63/664
Inventor 唐进伟华成明周俊锋胡远奇肖玉新
Owner 武汉仕全兴聚氨酯科技有限公司
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