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Water-borne epoxy resin for anticorrosive coating, application and preparation method of water-borne epoxy resin

A water-based epoxy resin and anti-corrosion coating technology, which is applied in the direction of epoxy resin coating, anti-corrosion coating, coating, etc., can solve the problems of environmental protection, affecting the mechanical properties of the film, emulsification and dispersion, etc.

Inactive Publication Date: 2021-05-28
STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a water-based epoxy resin for anti-corrosion coating, its application and its preparation method, to solve the problem that the epoxy resin can only be emulsified and dispersed by adding an external emulsion in the past. problems, and there are also problems affecting the mechanical properties of the membrane

Method used

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preparation example Construction

[0029] Specifically, this embodiment provides a method for preparing a water-based epoxy resin for anti-corrosion coatings. The specific preparation steps of the method are as follows:

[0030] S1: Carboxylated polyethylene glycol monomethyl ether is used to perform a ring-opening reaction on the epoxy group of the epoxy resin to prepare a hydroxyl-containing epoxy oligomer;

[0031] S2: Capping the hydroxyl-containing epoxy oligomer prepared in step S1 with isocyanate to obtain an epoxy resin with carbamate groups;

[0032] S3: adding deionized water to the epoxy resin with carbamate groups prepared in step S2, and stirring to obtain a water-based epoxy resin emulsion.

[0033] Wherein, the molecular weight of the poly(ethylene glycol monomethyl ether) of carboxylation is preferably 200-1000g / mol, and the poly(ethylene glycol monomethyl ether) of carboxylation under this molecular weight range can make the above-mentioned prepared polymer have self-emulsifying properties, suc...

Embodiment 1

[0041] Add 200 kg of carboxylated polyethylene glycol monomethyl ether with a molecular weight of 200 g / mol into the reactor, raise the temperature to 120 °C, continue to add 202 kg of 1,4-butanediol diglycidyl ether, and react for 2 hours to obtain Hydroxyl epoxy oligomers. Cool down to 80° C., add 111 kg of isophorone diisocyanate, and react for 3 hours to obtain an epoxy resin containing carbamate groups. Continue to add 513 kg of deionized water (the weight ratio of deionized water to resin is 1:1), and stir at a high speed of 1500r / min for 20min to obtain a water-based epoxy resin with a solid content of 50%.

[0042] Take 1026g of the above-mentioned emulsion, which contains 513g of matrix resin, add 51.3g of ethylenediamine with 10% weight of matrix resin to the emulsion, stir evenly, introduce it into a mold to form a film, and test.

Embodiment 2

[0044] Add 100 kg of carboxylated polyethylene glycol monomethyl ether with a molecular weight of 1000 g / mol into the reaction kettle, raise the temperature to 120 ° C, continue to add 34 kg of bisphenol A diglycidyl ether, and react for 2 hours to obtain epoxy resin containing hydroxyl groups. oligomers. Cool down to 50°C, add 12.5 kg of diphenylmethane diisocyanate, and react for 2 hours to obtain an epoxy resin containing carbamate groups. Continue to add 2933 kg of deionized water (the weight ratio of deionized water to resin is 2:1), and stir at a high speed of 2000r / min for 30min to obtain a water-based epoxy resin with a solid content of 33.3%.

[0045] Take 1000g of the above-mentioned emulsion, which contains 333g of matrix resin, add 133.2g of tetraethylenepentamine 40% of the weight of matrix resin to the emulsion, stir evenly, introduce it into a mold to form a film, and test.

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Abstract

The invention discloses water-borne epoxy resin for an anticorrosive coating, application and a preparation method of the water-borne epoxy resin; according to the preparation method, the self-emulsifying function of the epoxy resin is achieved by introducing a highly hydrophilic polyethylene glycol branched chain to a molecular chain of the epoxy resin; meanwhile, due to the fact that the molecular chain segment is short, under the action of polyethylene glycol, the solid content can be up to 66.7%. Besides, no extra alcohol-soluble solvent or other high-boiling-point organic solvents are needed in the preparation process of the water-based emulsion, the production process and the product use process are very environment-friendly, and the water-based epoxy resin can be mixed with a water-based ammonia curing agent to be cured into a film for corrosion prevention.

Description

technical field [0001] The disclosure of the invention relates to the technical field of polymer synthesis and water-based emulsion preparation, in particular to a water-based epoxy resin and its preparation method and application. Background technique [0002] Waterborne polyurethane is a polyurethane system that uses water instead of organic solvents as the dispersion medium. It is widely used in the fields of environmentally friendly coatings, adhesives and inks. It has the advantages of no pollution, safety, and excellent mechanical properties. However, the existing industrial products also have problems such as low solid content, slow surface drying, and addition of high-boiling organic solvents such as N-methylpyrrolidone (NMP). In order to increase the solid content and solve the remaining problem of NMP, the patent CN202010533710.6 uses aliphatic isocyanate and polycaprolactone diol (PCL) as raw materials, and uses DMPA and PCL to have good compatibility without usin...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08C08G59/14
CPCC09D163/00C09D5/08C08G59/1477C08G2150/90C08G59/22C08G59/50C08G59/4028
Inventor 郑舒文杨长龙许超李小兰马元生王大众多俊龙金鹏赵龙鞠明杰
Owner STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER
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