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Method for preparing waterborne polyurethane taken as waterborne epoxy hardener

A water-based polyurethane and water-based epoxy technology, applied in the chemical industry, can solve the problems of complex synthesis of curing agent, difficulty in large-scale production, and difficult operation process, and achieve good curing epoxy resin system, easy operation, and improved compatibility Effect

Inactive Publication Date: 2010-09-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyurethane modified epoxy resin curing agent uses more raw materials, and many functional groups can react with each other, which makes the synthesis of the curing agent more complicated, the operation process is difficult to control, it is easy to gel, and it is more difficult to carry out large-scale production.

Method used

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  • Method for preparing waterborne polyurethane taken as waterborne epoxy hardener
  • Method for preparing waterborne polyurethane taken as waterborne epoxy hardener
  • Method for preparing waterborne polyurethane taken as waterborne epoxy hardener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Synthesis of the prepolymer containing terminal isocyanate groups: first add 20g isophorone diisocyanate (IPDI), 27.24 a mixture of 1,4-butanediol adipate (PBA-2000) and 13.62 g polyethylene glycol (PEG-1000), and dissolved in 15.87 (20%) g N-methylpyrrolidone (NMP) 2.38g (3%) of hydrophilic chain extender dimethylolpropionic acid (DMPA), stirred and heated to 80°C, added dropwise 0.2g (1%) dibutyl dilaurate (DBTDL), and Temperature controlled reaction for 3h.

[0019] 2. Neutralization and emulsification of the prepolymer: cool the prepared prepolymer to room temperature, then add 1.79g of triethylamine (TEA) for neutralization, react for 40 minutes, then add 152.2g of distilled water while vigorously stirring to emulsify it , to obtain an emulsion with a solid content of 30%.

[0020] 3. Amino-terminated water-based polyurethane emulsion: 5.4 g of ethylenediamine was added for chain extension (the molar ratio of amino group to isocyanate group was 2:1) and reacte...

Embodiment 2

[0027] 1. Synthesis of prepolymers containing terminal isocyanate groups: first add 20g hexamethylene diisocyanate (HDI), 20.44 A mixture of g poly-1,4-butylene adipate (PBA-2000) and 10.22 g of polyethylene glycol (PEG-1000), and dissolved in 18.93 g (25%) of N-methylpyrrolidone (NMP ) of 5.3g (7%) hydrophilic chain extender dimethylolpropionic acid (DMPA), stirred and heated to 90 ° C, dropwise added 0.8g (4%) dibutyl dilaurate (DBTDL), And temperature control reaction 4h.

[0028] 2. Neutralization and emulsification of the prepolymer: cool the prepared prepolymer to room temperature, then add 4.04g of triethylamine (TEA) for neutralization, react for 50 minutes, then add 112.83g of distilled water while vigorously stirring to emulsify it , to obtain an emulsion with a solid content of 35%.

[0029] 3. Amino-terminated water-based polyurethane emulsion: Add 7.2 g of ethylenediamine for chain extension (the molar ratio of amino group to isocyanate group is 3:1), and react ...

Embodiment 3

[0036] 1. Synthesis of the prepolymer containing terminal isocyanate groups: first add 20g isophorone diisocyanate (IPDI), 27.24 g polyadipate-1,4-butylene glycol (PBA-2000) and 13.62g polyethylene glycol (PEG-1000) mixture, and dissolved in 15.87g (20%) N-methylpyrrolidone (NMP ) of 2.38g (3%) hydrophilic chain extender dimethylol propionic acid (DMPA), stirred and heated to 100 ° C, dropwise added 0.4g (2%) dibutyl dilaurate (DBTDL), And temperature control reaction 5h.

[0037] 2. Neutralization and emulsification of the prepolymer: cool the prepared prepolymer to room temperature, then add 1.79g of triethylamine (TEA) for neutralization, react for 60 minutes, then add 138.61g of distilled water while vigorously stirring to emulsify it , to obtain an emulsion with a solid content of 32%.

[0038] 3. Amino-terminated aqueous polyurethane emulsion: add 6.18 g of diethylenetriamine for chain extension (the molar ratio of amino groups to isocyanate groups is 2:1), and react f...

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Abstract

The invention relates to a method for preparing waterborne polyurethane taken as a waterborne epoxy hardener. The method comprises the following steps of: adding aliphatic polyisocyanate into low polymer polyalcohol; dissolving dimethylolpropionic acid taken as a hydrophilic chain extender in N-methylpyrrolidone; adding dibutyltin dilaurate taken as a catalyst into the mixture; stirring the mixture and raising the temperature to a certain extent to prepare a preformed polymer containing a terminated isocyanate group; cooling the prepared preformed polymer to room temperature; adding triethylamine into the preformed polymer to perform neutralization reaction for a certain period of time; and adding an appropriate amount of distilled water and violently stirring the mixture to emulsify the mixture; and adding a polyamine chain extender to perform chain extension reaction for a certain period of time to obtain amino-terminated waterborne polyurethane emulsion. The method has the advantages of preparing polyurethane emulsion which can be directly applied to curing epoxy resin, realizing a simple synthetic method and more easily controlled operation, enhancing the compatibility of epoxy resin emulsion with a curing agent, enabling a synthetized paint product to achieve the advantages of polyurethane and the epoxy resin and realizing high performance of paint.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of water-based polyurethane used as a water-based epoxy curing agent. Background technique [0002] In today's society, people pay more and more attention to the environment and health. People begin to pay attention to the harm that coatings bring to people while they bring benefits to people. The environmental protection regulations of various countries also regulate the content of volatile organic compounds (VOC) in coating systems. These have promoted the development of low-pollution coatings represented by water-based coatings. [0003] In this context, water-based epoxy coatings that have many advantages such as low VOC and low odor, while ensuring high mechanical strength, high adhesion, low shrinkage, good stability, and excellent processability, have become Hot spots in the coatings industry. However, due to its brittleness, po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/32C08G59/50C09D163/00C09D7/12
Inventor 刘晓菲王琪李宗亮杨帆曾安蓉
Owner TIANJIN UNIV
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