Hyperbranched aqueous polyurethane and preparation thereof

A water-based polyurethane and compound technology, applied in chemical instruments and methods, polyurea/polyurethane coatings, polyurea/polyurethane adhesives, etc., can solve problems such as inability to disperse

Inactive Publication Date: 2009-05-27
WUYI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But none of these hyperbranched polyurethanes are water soluble and cannot be dispersed in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1.073g of dimethylolpropionic acid (DMPA) was dissolved in 3.0g of N,N-dimethylformamide (DMF), and 7.114g of isophorone diisocyanate (IPDI) was added under stirring, and the temperature was raised to React at 45°C for 10 hours to obtain a colorless transparent liquid; add 1.682g diethanolamine (DEA) to the reaction system and keep it warm for 1.0 hour; heat up to 55°C for 6.0 hours, cool and discharge to obtain a colorless transparent liquid, which is separated After purification, 7.89 g (81%) of the product was obtained as a white powdery solid.

Embodiment 2

[0016] Dissolve 2.235g of dimethylolpropionic acid (DMPA) at 25°C in 8.0g of N,N-dimethylformamide (DMF), add 8.465g of toluene diisocyanate (TDI) under stirring, and keep warm React at 25°C for 6 hours to obtain a yellowish transparent liquid; cool the system down to 15°C, add 2.364g of diethanolamine (DEA) to the reaction system, and keep it warm for 1.0 hour; raise the temperature of the above reactant to 50°C for 6.0 hours of constant temperature reaction , cooled and discharged to obtain a yellow transparent liquid, and after separation and purification, 12.02 g (92%) of a white powdery solid product was obtained.

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PUM

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Abstract

The invention provides hyper-branched waterborne polyurethane and a preparation method thereof, and relates to hyper-branched waterborne polyurethane obtained by the method and application thereof. The method comprises the following steps: 1) diisocyanate containing two isocyanate radicals reacts with organic acid containing one carboxyl group and two hydroxyl radicals, so as to obtain a reaction intermediate which contains two isocyanate groups and one carboxyl group on average and is called A1 for short; 2) the A1 reacts with a monomer containing one amino group and two (or more than two) hydroxyl radicals, so as to obtain a reaction intermediate which contains one isocyanate group, one carboxyl group and two (or more than two) hydroxyl radicals on average and is called A2 for short; and 3) the A2 is heated to enable the isocyanate group to react with the hydroxyl radicals, so as to obtain a hyper-branched waterborne polyurethane product containing hydrophilic carboxyl group structures, and then the product is separated and dried so as to obtain a hyper-branched waterborne polyurethane solid product in the shape of white powder. The obtained hyper-branched waterborne polyurethane simultaneously contains a large number of carboxyl groups and hydroxyl radicals, can be neutralized with alkaline matter and then dissolved in water, is suitable to be used as environment-friendly waterborne coatings, waterborne adhesives, phase compatibilizers, rheological additives, thixotropic agents, nucleating agents, active compound carriers or catalyst carriers and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to a method for preparing hyperbranched water-based polyurethane, and to the hyperbranched water-based polyurethane obtained by the method and its application. Background technique [0002] The concept of highly branched macromolecules was first proposed by Flory in 1952, who pointed out the possibility of preparing highly branched polymers by polymerizing multifunctional monomers. As long as the monomer is AB x (X≥2) type, A and B are both reactive functional groups, which can produce a hyperbranched structure. In this structure, chain growth occurs between two different functional groups without additional protection steps. At the same time, he also made some speculations about its nature. [0003] Hyperbranched macromolecules (Hyperbranched polymer) structure is similar to dendritic. Kim first applied for the first patent (U.S.Pat.4857630, 1987.) on the preparation of hyperbranched polymers in 1987, and announced this achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/30C09D175/04C09J175/04C08L75/04B01J32/00
Inventor 孙宁童真黄达昌姜少华任碧野刘新星王朝阳董磊程兰兰
Owner WUYI UNIV
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