How to Identify the Quality of Powder Coatings
1、 Appearance recognition method
1. The hand feels silky and smooth, fluffy and floating Rough and heavy hand feel Grab a handful of powder in your hand, the smoother and more fluffy the powder, the better the quality. On the contrary, the rough and heavy feel of the powder results in poor quality Not easy to spray, with a lot of secondary powder drop and high waste.
2. The larger the volume, the less filling material in the powder coating, and the higher the cost. The better the powder quality. The smaller the volume, the higher the filling material in the powder coating, and the lower the cost. The worse the powder quality. For the same cardboard box, the larger the powder volume, the better the powder, while the smaller the volume, the worse the powder Not easy to spray, with more secondary powder drop, large waste, less spraying area, and high usage cost.
3. Powders with good storage time can be stored for a long time, and their leveling and other effects remain unchanged Poor powder cannot be stored for a long time. After 3 months, poor powder will have poor leveling and other effects The shelf life of normal powder at room temperature is 12 months, and the product quality is unstable and prone to deterioration when using low-end raw materials Using poor raw materials to produce powder, the sprayed surface will accelerate pulverization and aging after six months, affecting customer reputation. In addition, the powder is not easy to store, resulting in large powder waste and high reporting fees for customers.
2、 Spray area identification method
The resin content of the powder with a normal spraying area should be around 55-65%, the resin should be around 20 yuan/KG, and the filling material should be around 2 yuan Some defective powder factories use resin content below 45% to substitute inferior materials, increase fillers to reduce costs, and reduce spraying area Comparison method: If two companies spray the same type of powder with the same product, which one has more powder spraying products, which one has fewer spraying products, and which one has fewer spraying products, it is considered poor and has high usage costs For manufacturers who use it, if the spraying area is small, the usage cost will be high. Calculated based on spraying 6 square meters per kilogram of powder, each less spraying square meter is equivalent to the manufacturer paying an additional 3-6 yuan per kilogram of powder. It is recommended that the manufacturer use genuine powder and carefully calculate their actual usage cost.
Theoretical spraying area 8-10 square meters 6-8 square meters
Actual spraying area 4-6 square meters 3-5 square meters
The usage cost per square meter is 3-6 yuan and 4-8 yuan.
3、 Identification method for spraying personnel's operations
Powder with high powder loading rate and work efficiency is easy to spray. Spraying 1-3 guns can cover the substrate, resulting in less secondary powder recovery and high work efficiency Poor powder is not easy to apply. Spray 3-5 guns to cover the substrate, resulting in more secondary powder recovery and low work efficiency Operators can determine whether the amount of powder dropped is sufficient based on the spraying rate At the same time, there are fewer products produced and more secondary powder recycling, which increases the burden on operators and leads to low work efficiency.
4、 Baking identification method
Is there a good powder that produces smoke during the baking process without producing a large amount of smoke Poor powder produces a large amount of smoke during the baking process Good powder raw materials do not generate a large amount of smoke, and some manufacturers fill the materials with inferior raw materials The amount of powder used will increase, and the square number cannot be sprayed, increasing the cost of use. The same amount of powder will produce fewer products.
5、 Method for identifying the appearance and gloss of finished products after baking
The powder product with a good appearance after baking has a delicate, full, transparent, and three-dimensional appearance Poor powder products have a dull and dull appearance, with a misty and opaque surface, and a poor three-dimensional feel Comparing and observing the appearance of two panels, it can affect customer reputation and product appearance.
A powder with good glossiness has good glossiness and can maintain relative gloss for a long time Poor powder glossiness works well when first baked, and after a few months, sagging begins The powder made from materials with poor glossiness and appearance inspection cannot maintain long-term gloss stability, resulting in sagging, powdering, and paint peeling
6、 Adhesion and aging identification method
Good adhesion and aging powder has strong adhesion and toughness, and can maintain non pulverization and aging for several years Poor powder has poor adhesion and is very brittle. It begins to age and pulverize after 3 months to 6 months of spraying Compare and test the adhesion and bending, and observe whether the product has aged or powdered after a few months Poor adhesion and aging, product prone to aging, powdering, rusting, shortening product service life, and affecting customer reputation.
7、 High temperature identification method
High temperature, adjust the temperature to 220-230 degrees, and keep it warm for 10-15 minutes. The powder has good temperature resistance and weather resistance. After high-temperature baking, the color change is small and the gloss change is not significant Poor powder, poor temperature and weather resistance, severe discoloration and dullness after high-temperature baking This method is particularly effective for detecting outdoor light colored powders Poor powder, using poor resin, titanium dioxide, poor pigments and fillers, poor temperature and weather resistance, low cost, and shoddy quality.
8、 Environmental identification method
SGS environmentally friendly powder materials are produced by large factories, ensuring environmental protection Poor materials and recycled powder cannot guarantee longterm environmental protection without exceeding standards Environmental SGS testing has caused significant economic losses to some export enterprises due to exceeding environmental standards.