One, the types of powder coating
Powder coating natural harmless, high efficiency, resource saving and environmental protection. Unlike ordinary paints, powder coating is in the state of micro-fine powder. Because it does not require solvents, it is called powder coatings. Although there are not as many varieties of powder coatings as solvent-based coatings, there are many polymer resins that can be used as powder coatings. In general, it can be divided into two categories: outdoor and indoor.
1, outdoor powder coatings
Pure polyester powder coatings are designed for outdoor weathering requirements and the design of powder coatings, outdoor weathering and color stability is very good, widely used in outdoor building materials and machinery. The product varieties and colors are colorful, there are bright, matte, flat, sanded and other products, can also be designed according to customer requirements and products. It is applied to aluminum profiles for construction, automobiles, agricultural machinery, new energy vehicles, motorcycles, construction machinery, road barriers, external fitness and competition equipment, and metal surfaces with weather-resistant requirements.
2, indoor powder coating
Epoxy-polyester type powder coating made of epoxy resin, polyester resin as the main raw material of the powder coating, has a very good decorative and thermal stability, is generally not applicable to the outdoors or weathering requirements of the place. This product variety, color colorful, including: wrinkles, high-gloss, non-gloss, matte, pattern, metal and other various color products. Apply to all kinds of hardware accessories, household appliances and medical equipment, automobiles, new energy vehicles, motorcycles, agricultural machinery, engineering machinery accessories, chassis cabinets, all kinds of furniture, etc. This product is not recommended for outdoor weatherproof products.
Pure epoxy powder coating adopts large molecular weight epoxy resin and curing agent as the main base material made of powder coating products. It has excellent adhesion, impact resistance, surface hardness, toughness, adhesion and other mechanical properties. High gloss, high leveling, good coating effect, good chemical resistance and corrosion resistance, good electrical insulation, too high a baking temperature, too long a time easy to yellow, can not be used for outdoor products. Apply to steel, valves, water pipes, cylinders, instruments and meters shell, agricultural machinery, steel structure, electromechanical equipment, motor rotor, and home, industrial equipment, security doors, fitness equipment.
Two, identify the good and bad powder coating paint
With the development and growth of powder coating paint, the market demand increases, the quality of powder coating paint also began to vary. So how should we distinguish between good and bad powder coating coatings?
1, the sprayer operation identification method: the rate of powder
Powder rate of good powder is extremely easy to spray, spray 1-3 shots can be covered with substrate, the secondary recycling of powder less, high efficiency. Poor powder is not good on the powder, spray 3-5 shots to cover the substrate, the secondary recovery of powder, low efficiency. Operators can be identified by spraying the rate of powder, falling powder more or less. The same time the output of less products, secondary recycling powder, increasing the burden of operators, low efficiency.
2, appearance identification method:
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 3 months after the leveling and other effects become worse. Normal powder shelf life of 12 months at room temperature, the use of low-end raw material product quality is not stable, easy to deteriorate. The use of poor raw materials to produce powder, spraying surface in half a year to accelerate the chalking, aging. In addition, poor powder is not easy to store, to cause powder waste, scrap material will be more.
Feel
Good powder feel silky smooth, pengsong, floating. Bad powder feel rough, sinking hand, heavy hand. Grab a handful of powder in the hand, the more smooth the powder pengsong, good quality, on the contrary, the powder is rough feel heavy, poor quality. Poor quality powder is not easy to spray, the second fall of powder, waste.
Volume
The smaller the volume, the higher the filler in the powder coating, the lower the cost, the worse the quality of the powder. The larger the volume, the less filler in the powder coating, the higher the cost, and the better the quality of the powder. For the same weight, the larger volume is good powder, and the smaller volume is poor powder. Poor powder is not easy to spray, the second fall more powder, waste, coating area is less, the use of high cost.
3, spraying area identification method: spraying area
Normal powder resin content should be in the 55-65% or so, the resin price of about 20 yuan / KG or so, the filler is about 2 yuan. Some unscrupulous powder factories use less than 45% of resin content to pass off as good, and increase the filler material to reduce the cost and reduce the spraying area.
Contrast method: two of the same kind of powder spray the same product, look at that one of the powder coating products more, that one of the spraying products less, spraying products less for the poor, the use of high cost. According to each kilogram of powder coating 6 square to calculate, each less spray a square, equivalent to the manufacturer of each kilogram of powder to pay more 3-6 yuan, it is recommended to use the manufacturer of genuine powder, carefully accounting for their actual cost of use. Theoretical spraying area of 8-10 square 6-8 square actual spraying area of 4-6 square 3-5 square cost per square 3-6 yuan 4-8 yuan.
4, baking identification method:
Baking identification method is mainly to see whether there is smoke. Good powder in the baking process does not have a lot of smoke. Poor powder in the baking process has a lot of smoke.
5, adhesion and aging identification method: adhesion and aging
Good powder adhesion, toughness, and can maintain a few years of non-chalking, aging. Poor powder adhesion is poor, very brittle, three months to half a year after spraying began to age, chalking. Comparison test adhesion and bending, as well as to observe a few months after the product has no aging, chalking. Poor adhesion and aging, the product is easy to aging, chalking, rust, the service life of the product will be greatly reduced.
6, the appearance of the finished product after baking and gloss identification method: the appearance of the baked
Good powder after baking the appearance of the product is delicate, transparent, full, three-dimensional sense of strong, can be maintained for a long time relative to the gloss. Poor powder after baking the appearance of dull, dull, foggy surface, not translucent, three-dimensional sense of difference, gloss in the just baked out of the effect is good, but can not keep the long-term stability of the luster, a period of time after the phenomenon of loss of light, chalking, paint and other phenomena.
7, high temperature identification method: high temperature
The temperature will be adjusted to 220-230 degrees, insulation 10-15 minutes, a good powder, temperature and weathering is better, baked at high temperatures after the color change is small, the gloss does not change. Poor powder, temperature and weather resistance is poor, after baking at high temperatures, serious discoloration, gloss becomes matte. This method is especially effective in detecting outdoor light-colored powder. Poor powder adopts poor resin, titanium dioxide, poor pigment and filler, poor temperature and weather resistance. The cost is low, and it is easy to be substandard.
8, environmental protection identification method: SGS environmental testing
Good powder coatings are large factory production, environmental protection is guaranteed. Poor material and recycled powder, can not guarantee long-term environmental protection does not exceed the standard. Environmental SGS test environmental protection exceeds the standard will be given to some export enterprises to create a car bigger trouble.
In the purchase of powder coatings, you can see the market is a lot of powder coatings, specifically to buy which type of powder coating, combined with their own needs to use to select the natural is able to buy a good product. As for the powder coating what, how to buy and so on, to be able to combine their own situation to actually pick it.