Powder
The difference between powder coating and paint spraying:
Spray painting and powder coating are two completely different coating methods. Spray painting is the use of compressed air to disperse liquid paint (commonly known as paint dispersed into paint mist particles adhered to the surface of the object being coated, while powder coating is done by means of compressed air arch powder the particles dispersed into the mist are adsorbed on the surface of the object by an electric field under the action of high-voltage static electricity
The correct name for powder coating is electrostatic powder coating, which is not simple to use with a spray gun. The electrostatic powder spraying equipment is composed of a powder hopper (pulverized with compressed air), a high-voltage electrostatic generator and an electrostatic powder gun. The types mainly include indoor powders and outdoor powders. The indoor powders are mainly epoxy type, outdoor powders mainly of polyester resin type. With the paint are basically two kinds of ingredients.
Spray paint and powder coating (plastic) are generally called spraying, the following explains the difference between spray paint and powder coating.
1, Paint selection
Spray paint, paint containing fluorocarbon paint, acrylic paint, epoxy paint, polyurethane paint
Powder coating (plastic), the coating used is powder coating, commonly known as plastic powder, the main types are:
Epoxy polyester powder coating (both indoor and outdoor) epoxy powder coating (anti-corrosion powder).
Simply put, the paint needs to be formulated into a liquid state after the solvent and the curing agent are formulated, and the powder is in the form of a powder solid.
2, Spray parameters
Painting and powder coating can be suspended firstly, or small spray booths can be used separately.
Paint can be applied either electrostatically or without static air.
Powder spraying must be electrostatic spraying, friction gun spraying, fluidized bed spraying and other methods.
3, Dry temperature
Paint drying temperature: 60 to 220 ° C, 15 to 60 min. Distinguish according to paint characteristics
Powder drying temperature: 180 ° C to 200 ° C, 10 to 20 min. According to the characteristics of the powder
4，Adhesion
Both can reach the 0 level standard under normal painting
5，Film thickness
Spray paint: 15-120μm. Depending on the composition of the paint
Powder coating: 60-120 μm, depending on the different type.
6，Color types
Paint: plain, metallic.
Powder: Artistic paints such as plain, metallic, wrinkle, and sand.
Cost analysis:
Paint according to: polyurethane paint to analyze calculation, paint solid content 40%, paint cost: 50 RMB, spray with air spray paint: 6 square, about = 8 RMB / square, primer about 7 RMB / square; at least two The total cost of two times spraying is about 15 RMB/square.
The powder was analyzed according to: epoxy powder: spray thickness of about 60 um, solvent free 100% solids. (Can do 0 discharges, powder can be recycled) Powder coating cost 20 RMB / kg, 1kg powder can be sprayed 8 square, total cost: about 2.5 RMB / square, powder needs to be cured, heat is needed, heating cost: 1 RMB / Square, but the large workpiece is the machine chassis, and the outer casing, electric box and other products, and the thickness is thicker, the heating cost is about 3 RMB / square total powder coating cost: 5.5 RMB / square.
Other cost analysis
Spray paint requires water curtain cabinet or dry spray booth, because 30-40% of the paint is wasted, this paint also needs to be treated, the processing cost is about 0.5 RMB / square, the utilization rate of powder is basically 100%, and the gas is recovered indoors. Emissions, no need to deal with the cost; paint contains formaldehyde, toluene, xylene and other harmful substances, the body damage to workers, and secondary spraying, adding a lot of manpower, material resources; Powdered workpiece: Thick coating, can cover some, the paint can’t make traces; And after the powder is cured, the coating is hard, it is not easy to break and the machine equipment is more high-grade.
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