Powder coatings are solvent-free, non-polluting, recyclable, environmentally friendly, save energy and resources, reduce labor intensity and coating film mechanical strength and high characteristics. The main areas are: marine industry and pipeline industry. With the rapid development of the industry, related knowledge and information, powder coatings in the selection of pigments more and more targeted, higher and higher standards, if you do not understand the chemical composition of various pigments and related properties, in the face of hundreds of pigment models will be at a loss, resulting in high cost of color matching or can not meet the requirements of use. So, what are the color mixing techniques of powder coatings? How to buy quality powder coatings? Let's take a look together!
Powder coating color mixing skills
Powder coating pigments can be classified according to the production method, composition structure, function and other different ways:
1.Classification of pigments according to the method of production
Categorized by the method of production into natural and synthetic pigments, natural pigments and synthetic pigments. Natural pigments, such as ingot green, are generally used in powder coatings with less natural pigments, while synthetic pigments include titanium dioxide, iron oxide series pigments, phthalocyanine series, azo pigments, polycyclic pigments and so on.
2. Functional distinction
Powder coatings can be divided into coloring pigments, body pigments (also known as fillers), antirust pigments, electrically conductive pigments and so on according to their functions in powder coatings, and for most functional powder coatings, the application of functional fillers is very important.
3. According to the chemical structure
Powder coating pigments can be divided into inorganic and organic according to the chemical structure of the pigments, inorganic pigments in titanium dioxide, zinc oxide, iron oxide series, molybdenum and chromium series, aluminum pigments, metallic pigments and so on, and organic pigments, such as phthalocyanine series, azodyne series, polycyclic pigments and so on.
4. The color phase of powder coating in the color mixing process
The pigments used in powder coating present different color phases due to the different factors such as chemical composition, crystal structure, surface state, particle size, process and equipment of the pigments, etc. For example, carbon black is the most widely used pigment in the powder coating, and when the size of the particle decreases or the surface increases, the blackness of carbon black will increase. When its particle size decreases or the surface increases, the blackness of carbon black will increase, and the light will be absorbed more and reflected less, making people feel more black. Some businessmen may also encounter how to adjust the black are not "black" problem, is the color problem!
Understanding the color phase of powder coating coloring is very important, let's say if you mix into a sample and the exact same as the 10 (that is, very satisfied, no need to add any pigment), then we are relatively easy to do from 0 to 9 this process, and from 9-10 this process, the existence of the difficulty of a great deal of, adjusted to the end, without pigment, the lack of just hue, coupled with the fact that regardless of the domestic and foreign In addition, no matter domestic or foreign pigments, there are different degrees of color phase batch difference, as well as the powder coating production process is not easy to control, so the general customers are allowed to have a certain range of color difference.
5. The colorfulness of the color samples
Inorganic pigment is usually good at keeping light and color and the cost is low, but the pigment is darker (i.e., not bright) and the coloring power is low, while the organic pigment is usually bright in color and high in coloring power, high in cost, and poor at keeping light and color, etc. Certainly, the light resistance of the color of the organic pigment of some big companies reaches more than 7 grades (1-8 grades, 8 grades being the highest). Of course, some big companies color organic pigments have a light resistance of more than 7 levels (light resistance 1-8, 8 is the highest level), weather resistance of more than 4 levels (weather resistance 1-5, 5 is the highest level), but the price is extremely expensive, so the price of powder made of this kind of pigment is also high. According to the color samples of the voluptuousness, combined with the price cost, debugging the standard color formula
How to buy quality powder coating
How to buy quality powder coating is one of the important factors of the quality of the coating good or bad. Here is a brief introduction to how to choose powder coating.
Appearance identification method:
1, feel
Hand sensation is silky smooth, pescetarian, floating.? Hand feeling rough, sinking hand, heavy hand.? Grab a handful of powder in the hand, the more smooth the powder pescetto, good quality, and vice versa, the powder is rough feel heavy, poor quality. It is not easy to spray, the second fall of powder, waste.
2, volume
The larger the volume, the less filler in the powder coating, the higher the cost. The better the quality of the powder. The smaller the volume, the higher the filler in the powder coating, the lower the cost. The lower the quality of the powder, the lower the cost. The same carton, see which one's powder volume is big, it is good powder, that one's volume is small, it is poor powder. Not easy to spray, the second fall of powder more, waste, spraying area is less, the use of high cost.
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 3 months after the leveling and other effects become worse. Normal powder shelf life at room temperature is 12 months, using 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 will accelerate the chalking, aging. Affect the customer's reputation. In addition, the powder is not easy to store, causing a big waste of powder to the customer, and more reporting costs.
Two, spraying area identification method:
Spraying area
Normal powder resin content should be in the 55-65% or so, the resin is about 20 yuan / KG or so, filler material is about 2 yuan. Some bad powder factories use less than 45% of resin content to substitute for good, increase the filler to reduce the cost and reduce the spraying area. Comparison method: two of the same kind of powder spraying the same product, see that one of the powder coating products more, that one of the spraying products less, spraying products less for poor, high cost of use. For the use of manufacturers will be, spraying area is less, the use of high cost. According to each kilogram of powder coating 6 square to calculate, each less spraying a square, equivalent to the manufacturers of each kilogram of powder to pay more than 3-6 yuan, it is recommended that the use of manufacturers with genuine powder, carefully accounting for their actual cost of use.
Theoretical spraying area?8-10 square?6-8 square
Actual spraying area?4-6 square?3-5 square
Cost per square?3-6 yuan?4-8 yuan
Three, spraying personnel operation identification method:
Powder rate, good efficiency of the powder Extremely easy to spray, spray 1-3 shots can cover the substrate, secondary recycling powder less, high efficiency. Poor powder is not good on the powder, spray 3-5 shots to cover the substrate, secondary recycling powder, low efficiency. Operators can be identified by the rate of spraying powder, falling powder more or less. The same time the output of less products, secondary recycling powder more, increase the burden of operators, low efficiency.
Four, baking identification method:
There is no smoke produced by the good powder in the baking process does not have a large number of smoke produced. Poor powder in the baking process has a lot of smoke. Good powder raw materials do not have a lot of smoke, some manufacturers take the second raw material to fill the good material. The amount of powder will increase, the square number of spraying does not come out, increase the cost of using the same amount of powder output less products.
Fifth, the appearance of the finished product after baking and gloss identification method:
Appearance after baking? Good powder product appearance delicate, full, transparent, strong sense of three-dimensional. Poor powder products have a dull, dull appearance, the surface is foggy, not translucent, poor sense of three-dimensional. Comparative observation of two boards? Poor appearance, affecting the reputation of customers, affecting the appearance of the product.
Good gloss powder gloss is good, can be maintained for a long time relative gloss.? Poor powder gloss just baked out when the effect is good, after a few months will begin to vector light. Gloss appearance test poor material to make the powder can not maintain long-term gloss stability, vector light, chalking, paint stripping.
Six, adhesion and aging identification method:
Adhesion and aging? Good powder adhesion, toughness, and can keep a few years of non-chalking, aging. Poor powder adhesion is poor, very brittle, 3 months to half a year after spraying will begin to age, chalking. Comparison test of adhesion and bending, as well as observing whether the product is aging and chalking after several months. Poor adhesion and aging, the product is easy to aging, chalking, rust, shorten the service life of the product, affecting the reputation of customers.
Seven, high-temperature identification method:
High temperature, the temperature will be adjusted to between 220-230 degrees, insulation 10-15 minutes? Good powder, temperature and weather resistance is relatively good, after high temperature baking color change is small, gloss change is not big. Poor powder, temperature and weather resistance is poor, after baking at high temperature, the color change is serious, the luster becomes matte. This method is especially effective in detecting outdoor light-colored powder. Poor powder, using poor resin, titanium dioxide, poor pigments and fillers, poor temperature and weather resistance. Low cost, second best.
Eight, environmental protection identification method:
SGS environmental protection testing of good powder materials are large factory production, environmental protection is guaranteed. Poor material and add recycled powder, there is no way to ensure long-term environmental protection does not exceed the standard. Environmental SGS testing? Environmental protection exceeds the standard to some export enterprises to cause greater economic losses.
Powder coating is an important trend in the development of aluminum profiles at this stage, powder coating for the processing of consumables products, investment threshold is relatively low, the market competition is fierce, but also caused a chaotic situation in the powder coating market, the phenomenon of cutting corners is serious, many companies will choose to pursue short-term interests, such a practice to some of the genuine enterprise has caused a relatively large impact, coupled with the powder coating for the powder substance, not easy to identify, to some of the powder enterprises to cause greater losses. It is not good to recognize, to some of the powder enterprises caused by the larger economic losses. Therefore, we should be vigilant on the quality issue.
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