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Silicone-modified waterborne epoxy curing agent and preparation method thereof

A water-based epoxy and curing agent technology, applied in the field of coatings, can solve the problems of short trial period, affecting the film formation and film performance of epoxy resin, and poor stability of two components, so as to improve hydrophobicity and toughness, and solve high VOC , the effect of improving compatibility

Inactive Publication Date: 2018-03-20
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some defects in this system: poor two-component stability, short trial period, poor hydrophobicity of the coating film, poor flexibility, easy to scratch, no stain resistance and poor impact resistance, etc.
However, the curing agent prepared above has poor compatibility with epoxy resin, which will affect the film formation and film performance of epoxy resin.

Method used

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  • Silicone-modified waterborne epoxy curing agent and preparation method thereof
  • Silicone-modified waterborne epoxy curing agent and preparation method thereof
  • Silicone-modified waterborne epoxy curing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dissolve 100 parts of diethylenetriamine into 30 parts of propylene glycol methyl ether, stir evenly at a stirring speed of 300r / min, then keep the reactant in a water bath at a constant temperature of 50°C, and dropwise dissolve 50 parts of propylene glycol under the protection of nitrogen. The solution of 20 parts of oxyethyl-terminated polymethicone oil in propylene glycol methyl ether was added dropwise for 1 hour, and after the dropwise addition was completed, the reaction was continued for 1.5 hours at 50°C. In a nitrogen atmosphere, 20 parts of propylene glycol methyl ether solution dissolved with 40 parts of E42 was added dropwise at a constant speed at 100°C for 2 hours, and the reaction was continued at 100°C for 1 hour. Cool down to 60°C, add 30 parts of propionic acid for neutralization, add dropwise for 0.5h, and finally add water dropwise and stir to prepare a silicone-modified water-based epoxy curing agent aqueous solution with a solid content of 30%.

Embodiment 2

[0034] Dissolve 100 parts of triethylenetetramine into 40 parts of propylene glycol methyl ether, stir evenly at a stirring speed of 300r / min, then keep the reactant in a water bath at a constant temperature of 75°C, and drop and dissolve 50 parts of cyclo The solution of 20 parts of oxyethyl-terminated polymethicone oil in propylene glycol methyl ether was added dropwise for 1.5 hours. After the dropwise addition was completed, the reaction was continued for 2 hours at 75°C. In a nitrogen atmosphere, 20 parts of propylene glycol methyl ether solution dissolved with 50 parts of E42 was added dropwise at a constant speed at 120°C for 2 hours, and the reaction was continued at 120°C for 2 hours. Cool down to 60°C, add 60 parts of propionic acid for neutralization, add dropwise for 0.5 h, and finally add water dropwise and stir to prepare a silicone-modified water-based epoxy curing agent aqueous solution with a solid content of 30%.

Embodiment 3

[0036] Dissolve 100 parts of triethylenetetramine into 40 parts of propylene glycol methyl ether, stir evenly at a stirring speed of 400r / min, then keep the reactant in a water bath at a constant temperature of 100°C, and drop and dissolve 50 parts of cyclo 30 parts of propylene glycol methyl ether solution of oxypropyl-terminated polymethicone oil was added dropwise for 2 hours. After the dropwise addition was completed, the reaction was continued for 2 hours at 100°C. In a nitrogen atmosphere, 20 parts of propylene glycol methyl ether solution dissolved with 50 parts of E44 was added dropwise at a constant speed at 120°C for 2.5 hours, and the reaction was continued at 120°C for 2 hours. Cool down to 60°C, add 40 parts of propionic acid for neutralization, add dropwise for 1 hour, and finally add water dropwise and stir to prepare a silicone-modified water-based epoxy curing agent aqueous solution with a solid content of 30%.

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Abstract

The invention discloses a preparation method of a silicone-modified waterborne epoxy curing agent. The preparation method comprises the following steps: respectively dissolving polyamine and epoxy-terminated silicone oil into alcohol ether type organic solvents, uniformly stirring, dropwise adding the epoxy-terminated silicone oil into the polyamine under nitrogen protection, and heating to react;adding bisphenol A epoxy resin into the reaction product, heating and reacting; adding organic acid to perform waterborne modification; and finally, adding water, thereby obtaining the silicone-modified waterborne epoxy curing agent with the solid content of 30-90%. According to the method disclosed by the invention, silicone graft modification of the curing agent is performed by adopting a ring-opening reaction of amino epoxy groups carried out between the epoxy-terminated silicone oil and polyamine, and the hydrophobic nature and toughness of the epoxy resin coating are improved; a ring-opening grafting reaction of the amino epoxy groups is carried out between epoxy group in the epoxy resin and amino on the silicone-grafted polyamine at a high temperature, so that the compatibility of the curing agent and the epoxy resin is improved; and due to the waterborne modification, the defect that the traditional organic coating has high content of VOC (Volatile Organic Compounds) can be overcome.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an organosilicon-modified water-based epoxy curing agent and a preparation method thereof. Background technique [0002] The current epoxy curing agent mostly adopts polyethylene polyamine system. However, there are still some defects in this system: poor two-component stability, short trial period, poor hydrophobicity of the coating film, poor flexibility, easy to scratch, no stain resistance and poor impact resistance. [0003] There are three commonly used modification methods for polyamines: (1) amidated polyamines prepared by the reaction of polyamines and mono-fatty acids; (2) polyamides formed by combining dimer acids and polyamines; (3) There are epoxy-polyamine adducts obtained by addition of polyamines and epoxy resins. These three methods all use the introduction of non-polar groups in the polyamine molecular chain, so that the modified polyamine curing agent has an...

Claims

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Application Information

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IPC IPC(8): C08G59/62C08G59/40C08G77/42C07F7/18
CPCC07F7/1804C07F7/1892C08G59/4085C08G59/62C08G77/42
Inventor 黄海汪志勇温建峰林春红陈娟
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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