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Modified epoxy resin emulsion, and preparation method and application thereof

An epoxy resin emulsion, epoxy resin technology, applied in epoxy resin coatings, coatings, conductive coatings, etc., can solve problems such as poor conductivity, poor sealing performance, poor stability, etc., to slow down or prevent damage, and facilitate batch production. The effect of production, long-lasting electrical conductivity

Inactive Publication Date: 2019-12-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently used conductive coatings have poor stability, poor conductivity, and long-term service of conductive coatings will increase their resistance and cause increased heat generation.
The ground grid anti-corrosion coating prepared by a company using nickel powder as conductive filler has poor anti-corrosion performance, and is not well compatible with epoxy resin, the film-forming material, and has poor sealing performance. Similarly, conductive fillers of metal powder series also Very easy to oxidize and poor conductivity
In the process of preparing conductive coatings in the prior art, there is a problem that the conductivity and anti-corrosion properties cannot have good performance at the same time

Method used

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  • Modified epoxy resin emulsion, and preparation method and application thereof
  • Modified epoxy resin emulsion, and preparation method and application thereof

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preparation example Construction

[0017] A method for preparing a modified epoxy resin emulsion provided by an embodiment of the present invention includes: mixing N, N, N', N'-tetramethyl-1,6-hexamethylenediamine, bisphenol A type epoxy The mixed reaction system of resin and organic solvent is heated to 50-70°C and reacted for more than 2 hours, then the pH value of the obtained reaction mixture is adjusted to 6.5-7, and then water is added to obtain a modified epoxy resin emulsion.

[0018] Wherein, by mixing and heating N, N, N', N'-tetramethyl-1,6-hexanediamine, bisphenol A type epoxy resin and solvent to carry out the described reaction, the bisphenol A type ring can be opened epoxy bonds in the epoxy resin and introduce hydroxyl and amino groups to obtain the modified epoxy resin emulsion.

[0019] In some embodiments, the preparation method specifically includes: after mixing N,N,N',N'-tetramethyl-1,6-hexanediamine, bisphenol A type epoxy resin with an organic solvent, Then, the reaction is carried out...

Embodiment 1

[0054] 0.5 mol mass ratio of epoxy novolak and E20 mixed resin and 0.5 mol mass ratio of 1: 1 acetone and ethyl acetate mixed solvent were added to the three-necked flask, wherein the three-necked flask was equipped with thermometer, condensing Tube and dropping funnel. Add 0.25 mol of N, N, N', N'-tetramethyl-1,6-hexanediamine and slowly raise the temperature to 50°C at a heating rate of 2°C / min for 2.5 hours of continuous reaction at a constant temperature, and then use rotary evaporation Drain the solvent in the system. Finally, adjust the pH value to 6.5-7 with acetic acid, add deionized water and stir until the viscosity is 300 cp after the reaction is complete, and prepare a modified epoxy resin emulsion with a solid content of 65%-75%.

[0055] The modified epoxy resin emulsion is used as a film-forming substance to prepare a conductive coating applied to the grounding grid. The preparation process is as follows:

[0056] Take an appropriate amount of solvent to fully...

Embodiment 2

[0058] Add 0.5 mol mass ratio of 1:1.5 novolac epoxy and E20 mixed resin and 0.5 mol mass ratio of acetone and ethyl acetate mixed solvent 1:1.5 into the three-necked flask, wherein the three-necked flask is equipped with a thermometer and a condenser and dropping funnel. Add 0.25 mol of N,N,N',N'-tetramethyl-1,6-hexanediamine and slowly raise the temperature to 60°C at a heating rate of 2°C / min for continuous reaction at a constant temperature for 3 hours, and then evaporate the The solvent in the system is discharged. Finally, adjust the pH value to 6.5-7 with acetic acid, add a certain amount of deionized water and stir until the viscosity is 270cp after the reaction is complete, and prepare a modified epoxy resin emulsion with a solid content of 60%-70%.

[0059] The preparation method of the conductive coating is the same as that of Example 1.

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Abstract

The invention discloses a modified epoxy resin emulsion, and a preparation method and an application thereof. The preparation method comprises the following steps: heating a mixed reaction system containing N,N,N',N'-tetramethyl-1,6-hexanediamine, a bisphenol A epoxy resin and an organic solvent to perform react a reaction, adjusting the obtained reaction mixture to be neutral or weakly acidic, and adding water to obtain the modified epoxy resin emulsion. The modified epoxy resin emulsion has the advantages of excellent stability, simple preparation method, long-term storage without deterioration, small influences on the environment, and easiness in dissolving and dispersing in the coating preparation process; and the preparation method is simple, so batch production is facilitated, and the problems of non-uniform dispersion and serious sedimentation of a pigment and filler when a traditional epoxy resin is used as a film-forming substance are solved. A conductive coating prepared fromthe modified epoxy resin emulsion has a lasting conductivity, can slow down or prevent damage to a metal matrix, and can be applied to protection of grounding grid metals under different working conditions.

Description

technical field [0001] The invention relates to the technical field of metal protection, in particular to a modified epoxy resin emulsion, a preparation method thereof, and an application thereof in grounding grids. Background technique [0002] Metal components buried in the soil for a long time often suffer from soil corrosion. Corrosion causes these metal components to be damaged to varying degrees, and maintenance is difficult and costly. At the same time, there are serious safety hazards. The corrosion of metal materials in soil is mainly affected by factors such as moisture, oxygen concentration, acidity and alkalinity, and microorganisms. There are mainly three types of corrosion: chemical corrosion, electrochemical corrosion, and microbial corrosion. According to statistics, developed countries will consume about 10-20% of metals due to corrosion every year, and the resulting economic losses account for about 2-4% of the national economic output, while the annual eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C09D163/00C09D5/24C08G59/14C08L63/00
CPCC08G59/1477C08J3/095C08J2363/00C09D5/24C09D163/00
Inventor 陈科锋刘栓王娟蒲吉斌周开河方云辉王立平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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