The development and principle of extinction electrophoresis

[China Aluminum Network] Since mainland China introduced the electrophoretic coating production line for aluminum profiles from Japan in 1981, it has been 30 years since its introduction. However, in mainland China, the electrophoretic aluminum material has been widely exposed to the masses, starting from 1999. It has been more than ten years.

1. Extinction electrophoresis:

1.1 Past Skills:

In the past, as a matter of concealing the inherent hue of the object to be coated, the fine pattern of matt paint is usually dispersed in the coating to distinguish ultrafine silicon dioxide, but the chemical resistance of the ultrafine silicon dioxide, especially the alkali resistance If it is poor, excellent transparency of the coating film cannot be obtained. As the coating material of the coating construction is disordered, ultra-fine silicon dioxide will accumulate on the object to be coated, and thus flow will occur in the coated area, especially in the vertical section. Defects in marks (gloss), followed by companies to disperse small-scale organic particles in the coating (such as ash). This method is common for solvent-borne spray coatings or dipping coatings. The electrophoresis skill is not allowed. The reason is that the electrophoretic properties of the organic microparticles are not taken into account. Therefore, the energized electrophoresis lacks a stable swimming speed and constitutes an uneven electrophoresis. When washed together, the organic microparticles are washed off.

1.2 Today's skills:

Resin extinction. The mechanism of extinction of the resin is to use different electrical properties of the connecting resin, and then the insoluble intraparticle microgel is formed in the electrophoretic coating film, so that the refractive index of the different parts of the coating film is not the same, thereby forming a diffuse Reflect, then reach the intention of extinction.

2. The principle of extinction electrophoresis:

At present, the world's companies that can safely produce aluminum extinction electrophoretic coatings include Japan's Kansai Coatings, Shendong Coatings, and Hany's into three companies. The three companies use completely different skills. Therefore, the extinction electrophoretic paint is impossible. Like a photoelectrophoretic paint, it is a major feature of extinction electrophoresis.

Unlike bright electrophoretic paints, matting electrophoretic paints usually have higher molecular weights. We know that when the molecular weight of electrophoretic paints is less than 10,000, the obtained weather resistance of coating films will be problematic. Therefore, the molecular weight of Japan-made bright electrophoretic paints is usually In the range of 25,000-40,000, the molecular weight of the matting electrophoretic paint is usually between 70,000 and 80,000. The measurement of molecular weight can be measured by GPC (gel permeation chromatography) and the sample can be measured with polystyrene. can.

If you take a company formula in between, the company uses compounds that are rich in carboxyl (-COO-) acrylic resins and molecules with two or less aziridino groups (shown below).

R: an aromatic residue having more than 5 carbon atoms, an aliphatic residue, and an alicyclic residue.

h: an integer of 2 or more.

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