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Single-component epoxy primer and preparation method thereof

An epoxy primer, one-component technology, applied in the field of coatings, can solve the problems of unstable ketimine structure, influence of coating storage period, insufficient stability, etc., and achieve strong corrosion resistance, long storage period and flexibility strong effect

Inactive Publication Date: 2014-08-27
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the biggest problem of ketimine curing agent is short storage period and insufficient stability.
[0004] Through the patent search, the following two related patent documents were found: In the patent CN1189817A, a method using 4,4`-diphenylaminomethane and phenylenediamine was introduced. The ketimines formed by diamine compounds containing benzene rings and cyclohexanone, cyclopentanone, etc. are used as curing agents to prepare magnetic recording media and thin films. These ketimines contain a large number of benzene ring structures and have relatively Large steric hindrance, although it can enhance its stability in epoxy coatings to a certain extent, but its amine group electrons are conjugated with benzene rings, resulting in unstable ketimine structure and affecting the storage period of coatings
In the patent CN 103102687 A, ketimine prepared from ethylenediamine, diethylenetriamine, acetone, methyl ethyl ketone, etc. is used as a second crosslinking agent to prepare a one-component room temperature sealant. Small ketimine is used as a curing agent, and there is obviously a problem of short shelf life

Method used

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  • Single-component epoxy primer and preparation method thereof
  • Single-component epoxy primer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Add 200g of 3,3-dimethyl-4,4-diaminodicyclohexylmethane (DMDC) and 400g of cyclohexanone to a three-necked flask equipped with a thermometer, a glass stopper, and a water separator respectively, When heated to 140°C, the water produced by the reaction boils with cyclohexanone, and enters the water separator to separate from the reaction system. After continuing to stir and react for 3 hours, the excess ketone is distilled off under reduced pressure, cooled, and sealed for use.

[0043] 2) Dissolve 100g of epoxy resin E44 into 30g of solvent, add 2g of gas phase SiO 2 , heated to 50°C to dissolve, stirred at 3000r / min for 10min, then added rutile SiO 2 20g, 20g of mica iron oxide, 5g of mica powder, 3g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 2g of dispersant, 0.5g of leveling agent, 0.5g of defoamer, etc., in Stir at 2000r / min for 20min, finally add 30g of the ketimine curing agent prepared above, stir at 2000r / min for 5min, and seal the package. Take out pa...

Embodiment 2

[0047] Other reactions are the same as in Example 1, except that cyclohexanone is changed to 2,4-tetramethyl-3-pentanone in the first) reaction. Test performance.

Embodiment 3

[0049] Other reactions are the same as in Example 1, except that in the second) reaction, the epoxy resin E44 is changed to bisphenol F type epoxy resin with an epoxy value of 0.42-0.48.

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Abstract

The invention relates to a single-component epoxy primer and a preparation method thereof. The epoxy primer disclosed by the invention is a single-component system, and is prepared from the following raw materials in parts by weight: 100 parts of epoxy resin, 30-70 parts of ketimine curing agent, 30-100 parts of solvent, 10-20 parts of rutile SiO2, 20-30 parts of anti-rust pigment, 5-10 parts of mica powder, 3-8 parts of silane coupling agent, 2-6 parts of gaseous phase SiO2, 2-7 parts of dispersant, 0.5-5 parts of flatting agent and 0.5-5 parts of defoamer. The single-component epoxy primer is mainly applied to the primers with smooth substrate (galvanized plate, tin plate, aluminum alloy and the like) surfaces, the coating has excellent adhesive force, flexibility and penetration resistance, a firm adhesive force is provided for a heavy-duty composite coating, and the single-component epoxy primer has the characteristics of being convenient in single component use, cured at room temperature and the like.

Description

Technical field [0001] The present invention involves a single component epoxy primer, especially a single -component epoxy primer and its preparation method, which is a technology field of coatings. technical background [0002] The epoxy resin has high adhesion, good dielectric performance, high hardness, and small deformation contraction rate. The characteristics of the stability of chemical solvents are widely used in industries such as coatings primer, intermediate paint, adhesive and composite materials.It is divided into a single component system and a dual -component system in the coating application. At present, the most applications are the dual -component system.focus on. [0003] The normal temperature latent curing agent used in the epoxy coating system is mainly ketamide and molecular sieve anchidamine.Among them, the biggest problem with ketoline curing agent is the shortcomings such as short storage period and insufficient stability. [0004] Through patent search...

Claims

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Application Information

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IPC IPC(8): C09D163/02C09D7/12C08G59/40
Inventor 刘志雷刘文杰周建萍周街胜廖玉莲
Owner NANCHANG HANGKONG UNIVERSITY
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