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Two-component coating based on modified epoxy resin and preparation method of two-component coating

A technology of epoxy resin and siliconized epoxy resin, which is applied in the direction of epoxy resin coatings, fireproof coatings, coatings, etc., can solve the problems of low heat resistance and toughness of epoxy resin coatings, and achieve heat resistance Uniform, achieve aging resistance, solve the effect of low aging resistance

Active Publication Date: 2019-12-31
ZHEJIANG YUTONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of two-component paint based on modified epoxy resin, wherein a large amount of siloxane bonds are introduced in the siloxanized epoxy resin prepared, so that the epoxy resin itself contains siloxane bonds, The siloxane bonds in the prepared coating after curing are uniformly present in the matrix resin, thereby making the prepared coating uniform in heat resistance, thereby solving the problems of low heat resistance and toughness of epoxy resin coatings in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The specific preparation process of siliconized epoxy resin is as follows:

[0022] Step 1: Add 10g of 4-bromophenol and 100mL of diethyl ether solution into the reflux reaction vessel, then slowly add magnesium chips soaked in ether, wherein the mass of magnesium chips is 1.6g, the solution boils slightly during the addition process, and the addition is complete After reacting until the solution does not boil, keep stirring and reacting for 20-30min, then remove the unreacted magnesium powder after filtering, and carry out vacuum distillation of the filtrate to obtain 4-hydroxyphenyl magnesium bromide;

[0023] Step 2: Weigh 2.08g of tetraethyl orthosilicate and add it to 150mL of ethanol solution, stir and mix evenly, then add 7.88g of 4-hydroxyphenylmagnesium bromide prepared in step 1, and stir at room temperature for 8-9h. Then add saturated ammonium chloride to the reaction vessel for quenching, and separate the obtained solid-liquid mixture. At the same time, eva...

Embodiment 2

[0026] The specific preparation process of the curing agent is as follows: ①Add 4.65g of thiophosphoric acid tris(4-phenylisocyanate) into 38mL of benzene and stir to dissolve, and at the same time add 3.66g of salicylaldehyde, stir and react at room temperature for 3-4h, and then carry out Distill under reduced pressure to obtain triphenylaldehyde phosphorothioate; 2. add triphenylaldehyde phosphorothioate prepared in 8.31g step 1. in 30mL benzene, then add 3.74g threonine thereto, and stir the reaction at room temperature 2- After 3 hours, the solvent was removed by evaporation, and the product was added into water, stirred and mixed, filtered, and the solid matter was dried to obtain a curing agent.

Embodiment 3

[0028] The specific preparation process of the curing agent is as follows: ①Add 1.74g of toluene diisocyanate into 38mL of benzene and stir to dissolve it. At the same time, add 2.44g of salicylaldehyde to it, stir and react for 3-4h at room temperature, and then carry out vacuum distillation to obtain phenyl diisocyanate. 2. 4.18g of phenyldialdehyde prepared in step 1. was added in 30mL of benzene, then 2.49g of threonine was added thereto, stirred and reacted for 2-3h at normal temperature, and then the product was added into water after the solvent was removed by evaporation, After stirring and mixing, filter, and dry the solid matter to obtain the curing agent.

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PUM

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Abstract

The invention discloses a two-component coating based on modified epoxy resin, wherein the two-component coating comprises a component A and a component B. The component A and the component B are mixed according to a mass ratio of (8.5-8.7):1. The component A comprises the following components in parts by weight: 60 to 70 parts of siloxanized epoxy resin, 1 to 1.5 parts of a polyphenol antioxidantand 4 to 5 parts of a filler; and the component B is prepared by mixing a curing agent, a reactive diluent and acetone according to a mass ratio of (8.5-8.9):(1.3-1.6):(2.1-2.4). A large number of siloxane bonds are introduced into the prepared siloxanized epoxy resin; the epoxy resin contains siloxane bonds, and the siloxane bonds in the coating prepared after curing uniformly exist in the matrix resin, so that the heat resistance of the prepared coating is uniform, and the problems of low heat resistance and low toughness of the epoxy resin coating in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of paint preparation, and relates to a two-component paint based on modified epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resin coatings are usually formed by kneading at a certain temperature with bisphenol A epoxy resin, novolac modified epoxy resin and aliphatic epoxy resin as the main body, and pulverized after cooling. It is non-polluting, low melt viscosity, strong coating film, good leveling, no primer coating film, good mechanical properties, excellent reactivity and storage stability, corrosion resistance, chemical resistance, color matching of coatings Well, the curing agent has a wide range of choices and a wide range of applications. However, the heat resistance and weather resistance of the existing epoxy resin coatings are poor, and the properties of the coatings are prone to change under the action of high temperature and relatively high-intensity ultraviolet radiat...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D7/48C09D7/61C08G59/06C08G59/52
CPCC08G59/063C08G59/52C08L2201/08C09D5/18C09D163/00C09D7/48C09D7/61C08K5/1345C08K3/013
Inventor 罗洪财
Owner ZHEJIANG YUTONG NEW MATERIAL
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