Nonionic aqueous epoxy hardener and its preparation method

A non-ionic, water-based epoxy technology, used in epoxy resin coatings, coatings, etc., can solve the problems of coating stability, poor water resistance, flash rust of metal bodies, etc., to increase controllability and safety, The effect of improving water resistance and simple preparation process

Active Publication Date: 2014-07-09
SHANGHAI KINGCOM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing water-based epoxy curing agents mainly include ionic and non-ionic. The ionic type generally increases the hydrophilicity by adding organic acids or alkalis to neutralize and form salts. The disadvantage is that the water resistance is poor, and the presence of organic acids will cause metal bodies to Flash rust phenomenon; also, when used with basic pigments, can affect the stability of the paint

Method used

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  • Nonionic aqueous epoxy hardener and its preparation method
  • Nonionic aqueous epoxy hardener and its preparation method
  • Nonionic aqueous epoxy hardener and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Prepare raw materials according to the following components and their mass percentages in the total material:

[0052] Component Mass percent (wt.%)

[0053] E-51 12%

[0054] Prepolymer A 36%

[0055] Triethylenetetramine 14.1%

[0056] Deionized water and propylene glycol methyl ether 22%

[0057] Phenyl glycidyl ether 15.9%

[0058] Wherein, the raw material mass percent of prepolymer A is:

[0059] E-51 12%

[0060] ED-2003 40%

[0061] Lauryl to Myristyl Glycidyl Ether 12%

[0062] Propylene Glycol Methyl Ether 36%

[0063] (1) Preparation of prepolymer A

[0064] In a reactor equipped with reflux, heating and stirring devices, put 40g of amino-terminated polyether ED-2003 and 36g of propylene glycol methyl ether solution, raise the temperature to 60~70°C and add 12g of dodecyl to tetradecyl glycidyl ether dropwise, The dropwise addition was completed in 30 minutes, and the temperature was controlled at 80-90°C for 3 hours. After the reaction, the tempera...

Embodiment 2

[0073] Prepare raw materials according to the following components and their mass percentages in the total material:

[0074] Component Mass percent (wt.%)

[0075] E-51 13.2%

[0076] Prepolymer A 33.1%

[0077] Diethylenetriamine 11.5%

[0078] Deionized water and propylene glycol methyl ether 29.1%

[0079] Butyl glycidyl ether 13.1%

[0080] Wherein, the raw material mass percent of prepolymer A is:

[0081] E-44 45%

[0082] Epoxy emulsifier 15%

[0083] Deionized water 35%

[0084] Butyl glycidyl ether 5%

[0085] (1) Preparation of prepolymer A

[0086] Put 30g of amino-terminated polyether ED-900 and 37g of propylene glycol methyl ether solution into the reactor equipped with reflux, heating and stirring devices, raise the temperature to 65~75°C and add 13g of butyl glycidyl ether dropwise, and the dropwise addition is completed in 30 minutes. And control the temperature at 80-90°C for 3 hours, cool down to room temperature after the reaction, add 20g of epox...

Embodiment 3

[0095] Prepare raw materials according to the following components and their mass percentages in the total material:

[0096] Component Mass percent (wt.%)

[0097] E-51 4.7%

[0098] Prepolymer A 48%

[0099] Isophoronediamine 23.4%

[0100] Deionized water and propylene glycol methyl ether 16.1%

[0101] Butyl glycidyl ether 7.8%

[0102] Wherein, the raw material mass percent of prepolymer A is:

[0103] E-51 67%

[0104] Emulsifier for epoxy resin 16%

[0105] Deionized water 17%

[0106] Epoxy Thinner 0%

[0107] (1) Preparation of prepolymer A

[0108] Put 30g of amino-terminated polyether ED-600 and 25g of propylene glycol methyl ether solution into the reactor equipped with reflux, heating and stirring devices, raise the temperature to 65~75°C and add 19g of butyl glycidyl ether dropwise, and the dropwise addition is completed in 30 minutes. And control the temperature at 80-90°C for 3 hours, cool down to room temperature after the reaction, add 26g of epoxy...

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Abstract

The invention discloses a nonionic aqueous epoxy hardener and its preparation method. The preparation method comprises the following steps: 1, preparing a prepolymer A; and 2, preparing the nonionic aqueous epoxy hardener: (1) adding a mixture comprising the prepolymer A, epoxy resin and a solvent into a mixed solution comprising basic amine and the solvent at 40-80DEG C in a dropwise manner, and carrying out a constant temperature reaction for 3h; (2) adding a monoepoxy compound at 40-80DEG C in a dropwise manner for termination, and carrying out a constant temperature reaction for 2h; (3) carrying out reduced pressure distillation after the reaction to remove the solvent; and (4) cooling to 50DEG C, and adding deionized water for dilution in a dropwise manner until the solid content is 40-70%. In the invention, a hydrophobic side chain is introduced into a long molecular chain, so the prepared nonionic aqueous epoxy hardener has the effects of a surfactant, has a good emulsification effect and improves the water resistance a hardened film; a reaction of an epoxy group and an amino group is carried out at a low temperature without a catalyst, so the production controllability and the production safety are increased; and the process flow of the method is simple.

Description

technical field [0001] The invention relates to a nonionic water-based epoxy curing agent and a preparation method thereof. Background technique [0002] Epoxy resin has the advantages of high strength and strong permeability and is widely used in the field of coatings. The solvent-based epoxy coatings currently used contain volatile solvents, which are harmful to the health of production and construction personnel. In recent years, water-based epoxy coatings have become the main direction of coating development as environmentally friendly coatings, and water-based curing agents are one of the important components of water-based coatings. First, it is a key factor in determining the performance of the coating. [0003] The existing water-based epoxy curing agents mainly include ionic and non-ionic. The ionic type generally increases the hydrophilicity by adding organic acids or alkalis to neutralize and form salts. The disadvantage is that the water resistance is poor, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/20C08G59/40C09D163/00C09D7/12
Inventor 吴泽明吴新华周盾白
Owner SHANGHAI KINGCOM CHEM
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