Textured Wood Grain Steel Coils Pre-Painted Galvalume Steel Coil AZ1565 Wall Cladding Usage HDP 30 Years Warranty

Textured Wood Grain Steel Coils Pre-Painted Galvalume Steel Coil AZ1565 Wall Cladding Usage HDP 30 Years Warranty

PPGI & PPGL (prepainted galvanized steel & prepainted galvalume steel) also known as pre-coated steel or color coated steel coil, It is a product made of hot-dip galvanized steel sheet, hot-dip galvalume steel sheet, electro galvanized steel sheet, etc.

After surface pretreatment, one or several layers of organic coating are applied on the surface, and then baked and solidified. The color coated steel coil is light in weight, beautiful in appearance, and has good anti-corrosion performance, and can be directly processed.

The color is generally divided into gray, sea blue, brick red, etc. It is mainly used in advertising, construction, decoration, home appliances, electrical appliances, Furniture industry and transportation industry.

The coatings used for color coated steel coils are based on the environment in which the resin is selected, such as polyester silicon modified polyester, polyvinyl chloride plastisol, polyvinylidene chloride, and the like.

Printed steel sheet can be used in household appliances, furniture, doors and windows, signs, outdoor decoration and so on. 

The substrate can be cold-rolled substrate, electro-galvanised substrate and hot-dip galvanised substrate, aluminium-zinc plated steel sheet, and materials with suitable mechanical properties should be selected according to the different uses.

• Hot-dip galvanised substrates : Hot-dip galvanised substrates can be selected according to the amount of galvanisation, zinc coating pattern and surface finishing. 
• Aluminium-zinc plated steel sheets : Since its introduction to the world market in the 1970s, aluminium-zinc plated steel sheet has become the most popular steel sheet for roofing and walling. The hot-dip alloy coating of aluminium-zinc-plated steel contains 55% aluminium, 43.5% zinc and 1.5% silicon, effectively combining the strength of steel, the corrosion resistance of aluminium and the sacrificial protection of zinc against cut-outs and intervals. In similar environments, galvanised steel sheet with the same coating thickness lasts about four times longer than galvanised steel sheet. Aluminium-zinc plated steel is a superior price/performance ratio product, costing far less than stainless steel or aluminium, and has a pleasing light silver-grey finish.

Second, the choice of paint base

Primer type and film thickness Primer has four types: epoxy resin, polyester resin, acrylic resin and polyurethane resin. Generally, the primer is selected according to the purpose of the product base, the occasion of use, the degree of processing, as well as the matching of the topcoat. The film thickness of primer is usually 5um. 

1,Epoxy primer

Good adhesion with the substrate, water resistance, alkali resistance, good chemical resistance, is the earliest coil with primer, flexibility is not as good as other primers.

2,Polyester primer

Good adhesion with the substrate, excellent flexibility, more sensitive to humid environments, less resistant to chemicals than epoxy primer.

3,Water-soluble acrylic primer

Good adhesion with the substrate, excellent flexibility, organic solvent content, low temperature curing, should not be stored in a humid environment, high pretreatment requirements.

4,Polyurethane primer

With chemical resistance, friction resistance, durability, good flexibility.

Topcoat types and film thicknesses

The most commonly used topcoats are polyester, silicone-modified polyester, polyvinyl chloride plastisol and polyvinylidene fluoride.

1,Polyester

Good adhesion, wide range of formability and outdoor durability, medium chemical resistance.

2,Silicon modified polyester

Good hardness, abrasion resistance and heat resistance of the coating film, as well as good outdoor durability and not chalking, gloss retention and flexibility is limited, the cost of medium to high.

3,Polyvinylidene chloride

Good formability and colour retention, excellent outdoor durability and resistance to chalking, solvent resistance, limited colours, expensive.

4,Polyvinyl chloride plastisol

Excellent external durability and chemical resistance, damage resistance, beautiful, need special primer matching. Surface can have a smooth type, for pressing or automatic shrinkage type to form patterns. Coating thickness is generally greater than 100um, in addition to plastic sol, in general, the primer plus topcoat coating thickness >= 20um, the product performance can achieve the intended purpose.

Third, the colour and gloss of the paint

Generally, the standard colour can be selected according to the production factory, which can shorten the workload in the pre-production stage. If you need special colours, because the coating first in the coating factory for small samples of configuration, and the performance of the requirements before production, so from the order to the colour plate production time will be longer. The surface gloss of the coating measured with a reflection angle of 60 degrees, the larger the value, the higher the gloss, the coatings used in the construction of medium-gloss and matt, between 30-55. This is because the high gloss coatings used on the building on the reflection of sunlight is strong, harsh; if indoors, at night in the light is easy to cause visual fatigue.