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Preparation method for waterborne polyurethane modified epoxy resin curing agent

A technology of epoxy resin curing and water-based polyurethane, which is applied in the chemical industry, and can solve the problems that it is difficult to achieve the mechanical properties of solvent-based epoxy, chemical corrosion resistance, paint film can not form a network structure, uneven distribution of resin and curing agent, etc. , to achieve superior water resistance, low cost, lower glass transition temperature and curing temperature

Inactive Publication Date: 2011-12-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of resin and curing agent, the paint film cannot form an effective continuous network structure, which affects the performance of the paint film.
At the same time, the dissociated acetate anion in the reaction does not participate in the reaction and cannot be removed from the coating film in time, but can exist in the paint film in a free state, affecting the water resistance of the coating film
Therefore, after the second-generation water-based epoxy film is formed, it is difficult to achieve the basic properties of solvent-based epoxy such as mechanical properties and chemical corrosion resistance.

Method used

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  • Preparation method for waterborne polyurethane modified epoxy resin curing agent
  • Preparation method for waterborne polyurethane modified epoxy resin curing agent
  • Preparation method for waterborne polyurethane modified epoxy resin curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Synthesis of modified epoxy resin: Add 50g of polyethylene glycol 1000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, stir and heat up to 80°C, then add 2.26g dropwise Add boron trifluoride ether, and then add 22.73g E-44 epoxy resin (epoxy value: 0.44mol / 100g), control the temperature and react for 6 hours, discharge, and cool at room temperature to obtain a liquid product.

[0021] 2. Synthesis of end-capped products: Add 50g of diethylenetriamine to a 250mI four-necked flask equipped with a stirrer, electric heating mantle, condenser and thermometer, stir and heat to 60°C and slowly add 96.73g of monoepoxide 501 dropwise. (butyl glycidyl ether), and temperature control for 1.5 hours, to obtain a capped product.

[0022] 3. Synthesis of polyurethane modified diepoxy compound: add 70g diepoxy compound 128 (bisphenol A type glycidyl ether) in a 250mI four-necked flask equipped with a stirrer, electric heat...

Embodiment 2

[0031] 1. Synthesis of modified epoxy resin: first add 100g of polyethylene glycol 4000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, stir and heat up to 95°C, then add 2.16g dropwise Add boron trifluoride diethyl ether, and then add 22.72g of E-44 epoxy resin (epoxy value: 0.44mol / 100g), control the temperature and react for 4 hours, discharge, and cool at room temperature to obtain a liquid product.

[0032] 2. Synthesis of end-capped products: Add 50g of diethylenetriamine into a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser and thermometer, stir and heat to 75°C and slowly add 96.73g of monoepoxide 501 dropwise. (butyl glycidyl ether), and temperature control for 2 hours to obtain the end-capped product.

[0033] 3. Synthesis of polyurethane modified diepoxy compound: add 76.7g diepoxy compound 128 (bisphenol A type glycidyl ether) in a 250mI four-necked flask equipped with s...

Embodiment 3

[0042] 1. Synthesis of modified epoxy resin: first add 50g of polyethylene glycol 6000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, stir and heat up to 110°C, then add 0.62g dropwise Add boron trifluoride diethyl ether, and then add 11.37g E-44 epoxy resin (epoxy value: 0.44mol / 100g), control the temperature and react for 8 hours, discharge, and cool at room temperature to obtain a liquid product.

[0043]2. Synthesis of end-capped products: Add 50g of diethylenetriamine into a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser and thermometer, stir and heat to 90°C and slowly add 96.73g of monoepoxide 501 dropwise. (butyl glycidyl ether), and temperature control for 2.5 hours, to obtain a capped product.

[0044] 3. Synthesis of polyurethane modified diepoxy compound: add 87.58g diepoxy compound 128 (bisphenol A type glycidyl ether) in a 250mI four-necked flask equipped with stirrer...

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Abstract

The invention relates to a preparation method for a waterborne polyurethane modified epoxy resin curing agent. The preparation method comprises the following steps: adding catalyst boron trifluoride ether to a polyethylene glycol, then adding epoxy resin, stirring and heating the mixture for some time to prepare modified epoxy resin with epoxy groups at both ends; dripping monoepoxy compound 501 to diethylenetriamine according to an equal molar ratio to prepare a blocking product; reacting the obtained modified epoxy resin with bisepoxy compound 128 and polyurethane prepolymer by mixing to prepare polyurethane modified diepoxide; dripping the prepared polyurethane modified diepoxide to the prepared blocking product to obtain an addition product; and neutralizing the addition product into a salt by dripping glacial acetic acid, and then adding water to prepare the waterborne polyurethane modified epoxy resin curing agent. By introducing the epoxy resin, the invention enables the paint film obtained after curing to have superior water resistance, solvent resistance, chemical resistance and flexibility, thereby achieving the fine characteristics of the polyurethane, and overcoming the disadvantages of the epoxy resin.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of a water-based polyurethane modified epoxy resin curing agent. Background technique [0002] With the development of coating science and technology and people's new ideas and awareness of laws and regulations, higher and higher requirements for environmental protection have been put forward. Since the organic solvents volatilized from traditional solvent-based coatings have brought serious adverse consequences to air pollution and human health, the research and development of environmentally friendly high-performance coatings has become a major issue in the coatings industry in the direction of low VOC, high efficiency, energy saving, and ecology. The consensus is also the inevitable way out for the development of the coatings industry. [0003] Waterborne epoxy coatings have many advantages, such as low VOC, less odor, safe to use, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/58C08G18/32C08G59/14C08G81/00C09D7/12C09D163/00
Inventor 刘晓非王琪李宗亮杨帆
Owner TIANJIN UNIV
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