Coil paint -Iota

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Service > Coil paint

Coil paint

Constituent

Coil coatings by the base material, crosslinking agent, pigment filler, additives and volatile grouping.

Classification

Can be classified according to use, primer, paint and paint back. Only a single general aluminum coating, galvanized steel and cold-rolled steel need primer and finish.

According to resin structure,

The most important performance requirements for the roll are good film flexibility and excellent weather resistance..

According to the European coil coating Association released the coil coatings production with a variety of matrix resin using volume showed that the polyester resin, amino resin or polyurethane binding accounted for about 60% of the ranked first, PVC plastisol (PVC) accounted for about 30%, ranked second, polyvinylidene difluoride (PVDF) 5% and ranks second, the remaining 5% including epoxy resin, acrylic resin, silicone modified polyester (SMP) and alkyd resin.

Polyester resin composition has a high variability, under the higher surface hardness and excellent deformability, especially in high molecular weight linear copolyester has strong metal adhesion, compared with other resin has good weather resistance. But the coating also has some disadvantages, such as the coating is limited to about 30 m, solvent and explosive hole; sometimes the crosslinking degree is very low. Because of the hydroxyl groups in the polyester and epoxy resin, they can be cross-linked with amino resin or blocked isocyanate resin.. The amino resin is mainly Hexamethoxymethyl melamine resin crosslinking agent, is the most common. The coatings prepared at a temperature of 160 or higher temperatures are favored by its high flexibility and weathering resistance..

PVC plastic sol in the coating with high solid content (> 90%), adopt to volatile plasticizing agent of crystalline polymers such a decentralized body (the proportion of about 75:25) can be far more than 100 µ m high film thickness, so its film thickness up to 80 - 200 µ m and get high deformability, used as anti corrosion of galvanized steel, excellent performance. However, there are still problems in the film hardness and temperature resistance and recycling of PVC plastic sol resin..

Epoxy resin paint shows the characteristics of the characteristics, in the metal bonding relay and anti-corrosion aspects, and deformation and weather resistance is relatively weak. It is generally used as primer, back paint, and tin paint..

Acrylic resin has a high variability, in the case of high molecular weight polymer, there is a good metal bonding relay. Its deficiency lies in the mechanical properties of regulation than polyester easily, so the coil coatings are not used more, there is generally a and polyvinylidene difluoride (PVDF) mixed use, to reduce the PVDF topcoat cost function.

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