4 uses of DMEA as coating catalyst

2021-12-02   Pageview:320

1, Used as pharmaceutical raw materials, intermediates in the manufacture of dyes, fiber treatment agents, anti-corrosion additives, etc., can be used as a water-soluble paint base, synthetic resin solvent, etc.

2, Used as dye intermediates, fabric dyeing aid and anticorrosive agent, also used in pharmaceutical industry

3, The product is used in ion exchange resin, polyurethane catalyst, medicine, emulsifier, textile auxiliary, corrosion inhibitor, anti-scaling agent, dye and paint solvent, synthetic 763 resin and its curing agent, etc. It is also used as fuel oil additive, and as acrylic acid derivative and used as flocculant in urban water purification field. In Japan, 50% of the product is used for ion exchange resin, 13.8% for polyurethane catalysts, and 11.2% of the consumption in coatings.

4, Used as anti-inhibitors, dye intermediates, dyeing aids for fabrics, antiseptics for pharmaceutical industry, and raw materials for resins.














In the figure, curve 1 represents the polarization diagram without corrosion inhibitor, and curve 2 represents the polarization diagram after adding corrosion inhibitor. In Figure 22-5(a), the corrosion inhibitor inhibits the anodic process and the corrosion inhibitor The addition of the agent causes the polarization curve to shift to a low current direction, while the cathodic polarization curve hardly changes.

At this time, the corrosion potential pe-pe moves in the positive direction, the corrosion current is reduced, and the corrosion inhibitor acts as a corrosion inhibitor by changing the anode process. In Figure 22-5(b), the corrosion inhibitor mainly inhibits the cathodic process of the corrosion battery. The addition of the corrosion inhibitor increases the cathodic polarization, while the anode polarization is not affected. As a result, the corrosion potential moves in the negative direction. The corrosion current is reduced, and the corrosion inhibitor acts as a corrosion inhibitor by changing the cathode process. In Figure 22-5(c), the corrosion inhibitor inhibits both the anode process and the cathode process of the corrosion cell. The addition of corrosion inhibitor makes both the anodic polarization curve and the cathodic polarization curve move to a low current direction, and the corrosion current is reduced, but the corrosion potential is almost unchanged or has only a very small change. The above three conditions can reduce the corrosion rate of metals.

Leid Heiser[31 discussed the mechanism of corrosion inhibitors in organic coatings, and deduced that an ideal coating corrosion inhibitor should be:

① Effective in a wide pH range.
② When reacting with the metal surface, the resulting product should have a much lower solubility than the unreacted corrosion inhibitor.
③It has sufficient solubility to maintain its storage in the coating. Of course, wax paraffin emulsions the solubility must be small to ensure that the corrosion inhibitor will not escape from the coating when exposed.
④ The corrosion inhibitor formed on the interface of the substrate should not reduce the adhesion of the coating substrate.
⑤ Corrosion inhibitors should be effective for both anode and cathode, and can prevent water and hydrogen from reducing the cathode reaction.


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