Nonionic water-based epoxy curing agent and preparation method thereof

A non-ionic, water-based epoxy technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve problems such as poor water resistance, flash rust on metal bodies, and influence on coating stability, so as to increase controllability and safety. Improved water resistance and simple manufacturing process

Active Publication Date: 2016-06-08
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 water-based epoxy curing agent and preparation method thereof
  • Nonionic water-based epoxy curing agent and preparation method thereof
  • Nonionic water-based epoxy curing agent and preparation method thereof

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 materials:

[0052] Component mass percentage (wt.%)

[0053] E-5112%

[0054] Prepolymer A36%

[0055] Triethylenetetramine 14.1%

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

[0057] Phenyl glycidyl ether 15.9%

[0058] Among them, the raw material mass percentage of prepolymer A is:

[0059] E-5112%

[0060] ED-200340%

[0061] Dodecyl to tetradecyl 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 amino-terminated polyether ED-2003 and 36g propylene glycol methyl ether solution, heat up to 60~70℃, drop 12g dodecyl to tetradecyl glycidyl ether, The 30min dripping is completed, and the temperature is controlled at 80~90℃ to react for 3h. At the end of the reaction, the temperature is reduced to room temperature. 12g epoxy resin E-51 is ...

Embodiment 2

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

[0074] Component mass percentage (wt.%)

[0075] E-5113.2%

[0076] Prepolymer A33.1%

[0077] Diethylenetriamine 11.5%

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

[0079] Butyl glycidyl ether 13.1%

[0080] Among them, the raw material mass percentage of prepolymer A is:

[0081] E-4445%

[0082] Epoxy resin emulsifier 15%

[0083] Deionized water 35%

[0084] Butyl glycidyl ether 5%

[0085] (1) Preparation of prepolymer A

[0086] In a reactor equipped with reflux, heating and stirring devices, put in 30g amino-terminated polyether ED-900 and 37g propylene glycol methyl ether solution, heat up to 65~75℃ and add 13g butyl glycidyl ether dropwise, 30min drop completion, The temperature was controlled at 80~90℃ to react for 3h. After the reaction, the temperature was lowered to room temperature. 20g epoxy resin E-44 was added, and the temperature was con...

Embodiment 3

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

[0096] Component mass percentage (wt.%)

[0097] E-514.7%

[0098] Prepolymer A48%

[0099] Isophorone diamine 23.4%

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

[0101] Butyl glycidyl ether 7.8%

[0102] Among them, the raw material mass percentage of prepolymer A is:

[0103] E-5167%

[0104] Epoxy resin emulsifier 16%

[0105] Deionized water 17%

[0106] Epoxy thinner 0%

[0107] (1) Preparation of prepolymer A

[0108] In a reactor equipped with reflux, heating and stirring devices, put 30g amino-terminated polyether ED-600 and 25g propylene glycol methyl ether solution, heat up to 65~75℃, add 19g butyl glycidyl ether dropwise, 30min drop completion, And the temperature is controlled at 80~90℃ to react for 3h, after the reaction, the temperature is cooled to room temperature, 26g epoxy resin is added, and the temperature is controlled at 80~90℃ to re...

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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 non-ionic waterborne 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 in use contain volatile solvents, which endanger the health of production and construction personnel. In recent years, water-based epoxy coatings have become the main direction of the development of environmentally friendly coatings, and water-based curing agents are an important component of water-based coatings. One is the key factor that determines the performance of the coating. [0003] The existing waterborne epoxy curing agents mainly include ionic and non-ionic types. The ionic type generally increases the hydrophilicity by adding organic acid or alkali to neutralize the salt. The disadvantage is that the water resistance is poor, and the presence of organic acid w...

Claims

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Application Information

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Patent Type & Authority Patents(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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