Effect of coating crosslinking agent

Effect of coating crosslinking agent

In the course of the experiment, the performance of the matching agent with the main paint, the emulsifying properties and the corrosion properties of the crosslinking agent are very important to the finished product.

Because of the emulsion is white, wet film and dry film color difference is very big, not easy to make the required color, cause great influence to multicolor paint color, color must wait for paint film of the reentry after crosslinking color matching, otherwise have to color match is not allowed.

Water-based coating in steel structure must add flash rust remover, otherwise the drying process is easy to rust, but found in testing the main paint, emulsion and rust removing iron plate after contact will not be rusty phenomenon, the active agent in emulsion has the certain flash rust resistance; Other modified amine adduct is alkaline, can inhibit the rust, the test results from epoxy varnish and white look, even without adding flash rust remover, products also have good flash rust resistance; Placed in the bottom, and paint the outdoor investigation did not appear more than 60 d blister, peeling, rust, cracking and other phenomenon that can not add flash rust remover, it does not consider adding formula in the flash rust remover.

Production process can't overly diluted, otherwise it will cause stratified precipitation epoxy resin, and affect the product performance, the dosage of the water control in (5-10) %, is better to use deionized water.

The mixing speed cannot be high, otherwise there is a lot of air in the product, it will affect the appearance and performance of the product during construction, and the mixing speed will be controlled in 800 r/min.

Due to the liquid epoxy resin molecular weight is small, the product is easy to appear false thick phenomenon, therefore, primers and paint should not be adding thickener, micaceous iron oxide intermediate paint more than major, dosage, sagging demand, must add a certain amount of thickening agent, dosage of control between (0.6 1.0) %.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine Raw material ：

TDA industrial, Sichuan production

Ethylene (Et) polymer grade, Shanghai production

TEA industrial imports

A reagent grade additives


Consider epoxy coating temperature is low in the winter when it is will influence the crosslinking, 2 it is not suitable for water-based coating construction temperature below 5 ℃, if add antifreeze will inevitably increase the VOC emissions, so the product is not necessary to add antifreeze.

According to the personal research experience for many years, especially the need to add flash rust remover of waterborne anticorrosion coating, its performance can fully meet the requirements of the industry standard, but in practice, placed outdoor products often appear rust yellowing phenomenon, its film and the contradiction of construction unit.

During test, therefore, must to sample of outdoor actual results of investigation, outdoor performance inspection unqualified products, despite good technical indicators, formula could eventually or worthless. So add outdoor place when testing index, and time is not less than 30 d, only after a certain period of time outdoors in the sun, rain, wet, temperature change and other natural conditions of alternating cycle, to prove whether there is use value formula.

The price of raw materials epoxy resin, emulsifier and active agent can be controlled, and the water can be processed on its own, laying the foundation for reducing the cost of the product. Using homemade epoxy emulsion formula can produce waterborne epoxy anticorrosive coating meet HG/T4195-2014 standard requirements of water sample, increased testing the performance of the project and the solvent products have very close to the bottom of the sample, experience, face in outdoor use environment actually placed the inspection, found no quality problems.

Because the formula does not add any organic solvent, construction use no smell, construction equipment completely with clean water, reduce the processing of harmful substances, effectively improve the construction environment and health of workers, zero VOC emissions. Therefore, homemade epoxy emulsion can make the water-based epoxy coating more quickly to market, and realize the industrialization development of water-based epoxy anticorrosion coating.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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