Water based epoxy anticorrosion coating with crosslinking agent

Water based epoxy anticorrosion coating with crosslinking agent

The development and production of environment-friendly and resource-saving coatings have become the main theme of the development of the coatings industry. Against this background, the steel structure corrosion protection has been gradually started to use the water-based coating.

Do not contain volatile organic compounds and low volatile of the epoxy resin system, and has become a research hotspot, waterborne epoxy resin at home and abroad get paint people attach great importance to. Now more than 90 percent of paint enterprises in China and abroad are engaged in the development of water-based epoxy coatings, and the development prospects are optimistic.

Methods of waterborne epoxy resin with direct method, on the contrary, chemical modification and so on three, including chemical modification was prepared by the emulsion properties, particle size small advantages of demulsification become more stable, are less commonly used method of waterborne epoxy resin.

Room temperature curing water-based epoxy coating is used in the coating area in four types:

I type system, by the waterborne epoxy curing agent and low molecular weight liquid epoxy resin composition, the waterborne epoxy curing agent as crosslinking agent, and emulsifier, it before using mixture emulsified liquid epoxy resin can match zero VOC coating; Ⅱ type system, by the high molecular weight solid dispersions and waterborne epoxy curing agent of epoxy resin, due to its reactivity under liquid epoxy resin, thus Ⅱ type of waterborne epoxy resin system applicable period is longer than type I, table dry time shorter than type I; Ⅲ type system, by the low molecular weight liquid epoxy resin emulsion and waterborne epoxy curing agent composition, it contains both hydrophilic chain segment of surface activity, and epoxy resin containing oil-wet chain segments, can greatly improve the compatibility of emulsifier and epoxy resin, can be made into zero VOC of waterborne epoxy coatings; Ⅳ type system, by the waterborne epoxy resin emulsion and polyurethane modified epoxy firming agent, with the right amount of polyurethane modified epoxy resin with good comprehensive properties of polyurethane modified epoxy curing agent, cured epoxy resin emulsion with it, and can improve the performance of waterborne epoxy resin coating.

Ⅲ type waterborne epoxy resin system are summarized in this paper, in view of the epoxy emulsion on the market price is high, the performance gap bigger problems, self-developed epoxy resin emulsion, by observing the product performance can meet the requirements of steel structure of epoxy anticorrosive paint, and can greatly reduce the production cost, make preparation of waterborne epoxy coatings to market faster.

Test materials. Liquid epoxy resin, modified amine adduct, reactive emulsifier, rutile titanium dioxide, iron oxide red, micaceous iron oxide, zinc phosphate, aluminum tripolyphosphate, barium sulphate, talc, thickening agent, defoamer, leveling agent, etc.




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


Testing equipment: SFJ dispersion machine, 101 - a - 1 electrothermal blowing, coating density cup, paint film row machine, bending experiment instrument, painting - 4 viscometer, the paint film is swinging rod type hardness tester, the drying time meter, flow experimental apparatus, analytical balance, precise resistance to salt spray test machine, the X-ray fluorescence spectrometer, impact tester, PosiTest AT -m adhesion tester.

Emulsion formula: 50% of liquid epoxy resin, 10% of reactive emulsifier, 40% deionized water, 0.3% of defoaming agent.

Emulsion production process: add formula ratio in reaction kettle all half of deionized water, emulsifier, epoxy resin, up to (60-65 ℃), under the r/min (600-700) reaction after 60 min, add the remaining water under stirring, continue to spread 30 min, stop stirring, sampling, testing, qualified after packing. Set aside.

Under the background of the current market, a lot of waterborne anticorrosive coatings can meet the detection requirements, for example without outdoor placed on the investigation to the actual usage environment, problems tend to be in after construction; In addition, due to the high price of waterborne anticorrosion coating, no big project performance support, let the customer of waterborne anticorrosion coating, is it not in the popularization and application of the steel structure industry.

Now, if you can use the waterborne epoxy emulsion as film forming matter of epoxy anticorrosive paint, solvent free epoxy coating will be considerable cost of raw materials, for the promotion of water-borne epoxy anticorrosive coatings to lay a good foundation. Using this emulsion varnish on first experiment, testing the performance of the varnish, if the varnish can achieve the expected performance,

especially the coating by outdoor place no blistering, peeling, rust, the problem such as craze, formula design, can be carried out on promotion to the primer, intermediate paint, paint, realize the series production and application of water-borne epoxy anticorrosive paint.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com