Method for synthesizing siloxane modified epoxy resin and water-based anti-corrosion coating

A technology of siloxane modification and epoxy resin, used in epoxy resin coatings, anti-corrosion coatings, coatings, etc., can solve the problems of insufficient cross-linking, low solid content of products, low solid content, etc., and achieve optimal waterproofing. Excellent performance, gloss retention, color retention, aging resistance, weather resistance, corrosion resistance, and remarkable effects

Active Publication Date: 2017-12-08
深圳市深赛尔股份有限公司
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Problems solved by technology

[0003] A lot of research has been done in the industry on the use of silicone to modify epoxy resin, such as Zhu Huayu and others using trimethoxysiloxane and phenylmethyldimethoxysiloxane to synthesize polyphenylmethylsiloxane, Modified E-20 improves the thermal stability of the polymer; S.Ahmad et al prepared a polysiloxane modified polysiloxane through the ring-opening reaction between the epoxy group of the epoxy resin and the hydroxyl group on the polysiloxane molecular chain. Non-toxic epoxy resin, the product uses polyamide as curing agent, and the thermal stability of the system is significantly improved through analysis and comparison; they all improve the thermal stability by modifying the traditional epoxy resin with silicone; and Yan Jin et al. used acrylate-modified epoxy resin to obtain water-based epoxy resin, and then used self-made siloxane oligomers for physical blending to obtain siloxane oligomer-modified water-based epoxy resin; Guo Wenlu et al. Oxygen resin and siloxane oligomers such as KH-550, etc., then introduce acrylic acid hydrophilic groups, and finally neutralize with alkali to obtain water-based silicone modified epoxy resin; Liu Wenyan and others also use similar methods to prepare water-based organic silicon Silicone-modified epoxy resins, they all use siloxane to modify water-based epoxy resins. The common problem is that the solid content of the obtained products is not high, so compared with traditional epoxy resins, the solid content is low and the crosslinking is easy. Not enough, the overall performance is still not ideal

Method used

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  • Method for synthesizing siloxane modified epoxy resin and water-based anti-corrosion coating
  • Method for synthesizing siloxane modified epoxy resin and water-based anti-corrosion coating
  • Method for synthesizing siloxane modified epoxy resin and water-based anti-corrosion coating

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preparation example Construction

[0058] 1. Preparation of siloxane hydrolyzate (measured in parts by mass)

[0059] ① Preparation of alcohol-acid-water solution: Weigh 80-85 parts of isopropanol, 5-10 parts of oxalic acid (COOCCOOH, content ≥ 98.0%), 5-10 parts of purified water, mix and dissolve evenly for later use.

[0060] ② Siloxane hydrolysis reaction: Weigh 65-70 parts of methyltriethoxysiloxane (MTES), octyltriethoxysiloxane (THES) or isooctyltriethoxysiloxane ( IYES), add 25 to 35 parts of alcohol-acid-water solution dropwise in the reaction kettle under stirring, and react slowly at room temperature for 3 to 5 hours. After the solution is completely clear and transparent, place it for 24 hours for later use.

[0061] The hydrolysis reaction process is as follows:

[0062]

[0063]

[0064]

[0065] Wherein, R is methyl, octyl, isooctyl, etc.;

[0066] ③Replacement phase inversion: Determine the solid content of the siloxane hydrolyzate according to the GB / T 1725 method, and the balance is...

Embodiment 1

[0100] Embodiment one MTES modified epoxy resin

[0101]Weigh 85 parts of isopropanol, 10 parts of oxalic acid (COOCCOOH, content ≥ 98.0%), and 5 parts of pure water, mix and dissolve evenly to make an aqueous acidic hydrolysis catalyst solution; then take 30 parts of alcohol-acid-water solution, and in the reaction Add it dropwise to 70 parts of MTES in the stirring state, react slowly at room temperature for 3-5 hours, wait for the solution to be completely clear and transparent, and let it stand for 24 hours; measure the solid content of the siloxane hydrolyzate according to the GB / T 1725 method, and the remaining The amount is water and alcohol solution, add the same amount of glycidyl methacrylate MTES, under vacuum at 120°C, extract the alcohol and water, complete the replacement and phase inversion, and obtain anhydrous and alcohol-free hydrolyzed siloxane; take low viscosity The (E-51 or 128) epoxy resin and hydrolyzed siloxane are mixed in the reactor at a molar ratio...

Embodiment 2

[0102] Embodiment two THES or IYES modified epoxy resin

[0103] In this embodiment, the MTES in the first embodiment is replaced by THES or IYES, and the experimental method is the same, so it will not be repeated here.

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PUM

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Abstract

The invention discloses a method for synthesizing siloxane modified epoxy resin and a water-based anti-corrosion coating. The method comprises the following steps: (1) preparing siloxane hydrolysate; (2) mixing low-viscosity epoxy resin with the siloxane hydrolysate in a molar ratio of 1 to 1.1 into a reaction kettle, and stirring at a constant temperature of 60 DEG C to react for 2-3 hours until the reaction liquid is completely clear and transparent, so as to obtain the siloxane modified epoxy resin. By hydrolyzing the siloxane modified epoxy resin, the defects that a paint film is not water-tolerant after the resin is hydrated, and the corrosion resistance is greatly decreased are broken through. The siloxane modified epoxy resin is a material for preparing a high-performance protecting coating layer, the comprehensive performance of a steel structure surface heavy anti-corrosion coating prepared from the siloxane modified epoxy resin has a ''superimposed effect'', the light retaining property, color retaining property, aging resistance, weather resistance and corrosion resistance of the steel structure surface heavy anti-corrosion coating are superior to unmodified epoxy resin coatings, and the steel structure surface heavy anti-corrosion coating is particularly suitable for the anti-corrosion protection of steel structure buildings of cross-sea bridges, seaport wharfs, offshore oil platforms, submarine pipelines, ships, containers and the like.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for synthesizing a siloxane-modified epoxy resin and preparing a water-based anticorrosion coating. Background technique [0002] Conventional epoxy resin is a widely used base material with good film-forming performance and excellent anti-corrosion performance of the coating. . However, due to the pressure of the environmental protection situation, the paint industry is currently forcing enterprises to transform to green and environmentally friendly paint products. The research on water-based epoxy anti-corrosion coatings has become a hot spot in the paint industry. However, a common problem commonly encountered by technicians in the industry is that after the epoxy resin and its coating are water-based, the coating has poor water resistance, which greatly reduces the anti-corrosion performance of the epoxy coating and cannot achieve the performance of solvent-ba...

Claims

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Application Information

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IPC IPC(8): C08G59/14C09D163/00C09D5/10C09D7/12
CPCC08G59/1438C08K3/04C08K3/34C08K7/00C08K13/04C08K2003/0893C08K2003/2241C08K2201/003C08K2201/014C09D5/106C09D163/00
Inventor 蒋瑞霞张驰
Owner 深圳市深赛尔股份有限公司
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