How to identify the quality of powder spray coating

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With the development and expansion of powder coatings, the market demand increases, the quality of powder spraying coatings began to be uneven. So how should we distinguish the good or bad powder coating?

 First, Appearance identification method: 1, Feel Good powder feel should be silky smooth, loose, floating. Bad powder feels rough, heavy and heavy. Catch a powder in the hand, powder is more smooth , quality is good, conversely, powder is coarse feel heavy, quality is poor. Poor quality of powder is not easy to spray, secondary powder, waste. 2, Volume The larger the volume, the less filling material powder coating, the higher the cost, the better the powder quality. The smaller the volume, the higher the powder coating filling material, the lower the cost, the worse the powder quality. The same weight, large volume is good powder, small volume is bad powder. Poor powder is not easy to spray, secondary powder, waste, less coating area, high cost of use. 3, Storage time Good powder can be stored for a long time, powder leveling and other effects remain unchanged.    Poor powder can not be stored for a long time, poor powder after 3 months leveling and other effects become poor. The shelf life of normal powder is 12 months at room temperature. The quality of low-end raw materials is unstable and easy to deteriorate. Use poor raw materials to produce powder, spraying the surface after half a year to accelerate the pulverization, aging.    In addition, the powder is not easy to store, resulting in powder waste, more fees.

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Two, Spraying area identification method: spraying area The resin content of normal powder should be about 55-65%, the price of resin is about 20 CNY /KG, and the filling material is about 2 CNY. Some bad powder factories use less than 45% resin content to shoddy, increase filling material to reduce costs, reduce the spraying area. Comparison method: two same powder spray the same product, see that one powder spraying products, that one spraying products less, spraying products less is poor, the use cost is high.   According to each kilogram of powder spraying 6 square to calculate, each less spraying a square, equivalent to the manufacturer per kilogram of powder to pay 3-6 CNY, it is recommended to use genuine powder manufacturers, carefully accounting their actual use costs. Theoretical spraying area 8-10 square 6-8 square actual spraying area 4-6 square 3-5 square per square use cost 3-6 yuan 4-8 CNY.

 Three, Spraying personnel work identification method: powder rate The powder with good powder rate is easy to spray, 1-3 gun can be sprayed to cover the substrate, the secondary recovery of powder is less, high efficiency. Poor powder is not good powder, spray 3-5 gun can cover the substrate, secondary recovery powder, low efficiency.   Operators can be sprayed on the powder rate, the powder down more or less identified. Less products produced at the same time, more secondary recovery powder, increase the burden of operation personnel, low efficiency.

 Four, baking identification method: there is no smoke Good powder does not produce a lot of smoke during baking. Poor powder has a lot of smoke produced during baking.

 Five, Baked product appearance and luster identification method: baked appearance After good powder baking, the product appearance is delicate, full, transparent, three-dimensional sense is strong, and can keep relatively shiny for a long time. Poor powder after baking product appearance dim, rigid, misty surface, not transparent, poor three-dimensional sense, gloss in just baked out of the effect is good, but can not maintain long-term luster stability, after a period of time, loss of light, powder, paint and other phenomena.

Six, Adhesion and aging identification: adhesion and aging Good powder adhesion, toughness, and can maintain a few years of non-powder, aging.   Poor powder adhesion is poor, very brittle, three months to six months after spraying began to aging, powder. Compare and test adhesion and bending, and observe whether the product is aging and powdering after a few months. Poor adhesion and aging, easy to aging, powder, rust, shorten the service life of the product.

 Seven, High temperature identification method: high temperature Adjust the temperature to 220-230 degrees, keep it warm for 10-15 minutes, good powder, temperature and weather resistance is better, after high temperature baking, the color becomes smaller, the luster changes little. Poor powder, poor temperature and weather resistance, after high temperature baking, serious discoloration, luster become dumb. This method is particularly effective in detecting outdoor light-colored powder. Poor powder using poor resin, titanium dioxide, poor pigment and filler, poor temperature and weather resistance. Low cost, shoddy. Eight, environmental protection identification method: SGS environmental protection testing Good powder materials are big factory production, environmental protection is guaranteed.   Poor materials and recycled powder, can not ensure long-term environmental protection does not exceed standards. Environmental protection SGS testing environmental protection standards will give some export enterprises to make cars bigger trouble.

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 Powder sprayed coatings are often done in a fake (jerry-built) way: 1, resin and the selection of raw materials: epoxy, polyester accessory for oil, authentic oil and accessories for commodities, material all over the country, from north to south, from west to east, there is not much difference, the material is shoddy, false way with raw materials with poor black epoxy and polyester instead of good material, all walks of life are the same.

 2, the ratio of resin and filler: the resin content of normal powder should be about 55-65%, the resin is about 20 CNY /KG, and the filler is about 2 CNY /KG. Poor powder resin content is less than 45% to shoddy, increase filling material 2 CNY /KG to reduce the cost.

 3, add proportion of recycled powder: recycled powder is divided into ground powder, sweeping powder, mixed powder recovered from the air duct, mixed powder in the recycling box, problem powder and expired powder. Recovery powder has special recovery, the normal market price of recovery powder is 1-3 CNY /KG. Powder according to the proportion of recycled powder added (100% recycled powder, 10%-80% added recycled powder) is different, the price is also different, the market recovery powder according to the proportion of recycled powder added price from 8 CNY /KG, 12-13 CNY to 16-17 CNY /KG are different. At present, adding reclaimed powder is the main way to fabricate powder spraying coatings.

 Status analysis of powder spraying coatings: Powder spraying coatings for processing consumables products, investment threshold is low, the market competition is intense, also caused the powder spraying coatings market chaos, cutting corners is serious, caused some authentic enterprises larger impact, plus powder spraying coatings for powder material, bad identification, for some powder enterprises caused large economic loss. The actual consumption of the original product is 3 tons, through the material adulteration, cheap, the powder consumption increased to 4-5 tons, but increased the cost of powder enterprises, most of the powder enterprises only care about the powder, do not care about the actual use of the cost, causing great losses to the enterprise.


Post time: Nov-26-2021