Coating technology: powder coating toning skills

Core tip: as an important part of colored powder coating, pigment mainly covers, decorates and protects the coated objects According to the structural design of the coated workpieces, colored powder coating can show the hidden style and cultural heritage of the workpieces, give people a sense of beauty, and have different properties of UV resistance, weather resistance, water resistance, alkali resistance and acid resistance of the coating film To the same extent The current manufacturers of powder coatings usually use manual color matching and computer color matching, and usually use manual color matching as the main way, so this paper summarizes some skills of color matching Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings: as an important part of colored powder coatings, pigments mainly cover, decorate and protect the coated objects According to the structural design of the coated workpieces, colored powder coatings can show the hidden style and cultural background of the workpieces, give people a sense of beauty, as well as the coating film Its UV resistance, weather resistance, water resistance, alkali resistance and acid resistance are all affected to varying degrees The current manufacturers of powder coatings generally use manual color matching and computer color matching, usually using manual color matching as the main way, so this paper summarizes some skills of color matching Fundamentals of chromatics Color is a kind of visual angle nerve feeling that the human eye is stimulated by the radiation energy of a certain wavelength and intensity Although the colors vary greatly, the most basic colors are only red, yellow and blue, which are commonly called three primary colors The two primary colors are equal to each other to form the secondary color (intermediate color), and the secondary color and the primary color are equal to each other to form the composite color Mixing the red, yellow and blue primary colors into black is essential for the toner to master these basic knowledge Generally, a pigment has three parameters of hue, saturation and lightness to determine, also known as the three elements of color Hue refers to the color difference among different colors, such as red, yellow, blue, etc., which determines the spectral composition of the light source and the feeling of the proportion of various wavelengths of radiation reflected (or transmitted) on the surface of the object to the human eye Lightness (also known as brightness), refers to the difference between the light and shade of the color, which is the brightness feeling of the human eye on the object Generally, the hand perspective perception and the influence of past experience, the higher the reflectivity of the object to the light, the higher its brightness Saturation (also called purity), refers to the saturation degree of color, sometimes called chromaticity, which is the color purity displayed on the basis of hue The monochromatic light of visible light is the most saturated color When these pigments are mixed with white light, the more unsaturated they are, the worse the reflection selectivity of light wave is, and the stronger the selectivity of light wave is, the more saturated they are Single color is pure color without adding other colors, and other colors are added to change into intermediate color or polychrome When two painted workpieces of the same color are illuminated by different lights or sunlight, the two objects show different colors and colored lights This is the nature of brightness Colors of a certain color have different strengths and weaknesses, which is the difference in saturation Color matching is the knowledge that every technician must have The three elements of color can be used to distinguish the differences of colored powder coatings That is, only when the three characteristic values of hue, brightness and saturation of two colors are the same, the two colors can be exactly the same If one of the parameters is not equal, the two colors are not the same The color matching skill of powder coating Pigments for powder coatings can be classified according to production methods, composition, structure and function According to production methods, they can be divided into natural pigments and synthetic pigments Natural pigments, such as Ding Qing, are generally used in powder coatings with less natural pigments, while synthetic pigments include titanium dioxide, iron oxide, phthalocyanine and azo pigments Multi ring pigments, etc According to the function of powder coatings, it can be divided into coloring pigments, physical pigments (also called fillers), antirust pigments, conductive pigments, etc for most functional powder coatings, the application of functional fillers is very important According to the chemical composition structure, pigments for powder coatings can be divided into inorganic and organic pigments according to the chemical composition structure Among the inorganic pigments, titanium dioxide, zinc oxide, iron oxide, molybdenum chromium, aluminum and metal pigments, while among the organic pigments, such as phthalocyanine, azo and polycyclic pigments, etc The manufacturers allowed by the conditions can be divided into more detailed charts, or because of the need of internal coding of manufacturers, for example, the color phase in the process of powder coating color mixing The pigments used in powder coatings present different hues due to different factors such as chemical composition, crystal structure, surface state, particle size, process and equipment For example, carbon black is the most widely used pigment in powder coatings When its particle size decreases or the surface increases, the blackness of carbon black will increase, the light absorption will be more, and the reflection will be less, making people feel blacker Some businesses may also encounter the problem of how black is not "black", that is, the color problem! It is very important as like as two peas to understand the color matching of powder coatings For example, if we set the sample exactly the same as the sample, 10 (which means that it is very satisfactory, no more pigments are added), then we can easily do this from 0 to 9, and from the 9-10 process, there is a great difficulty There are different levels of color difference in the pigment batch, and the powder coating production process is not easy to control, so the general customer also allows a certain range of color difference The brilliance of color patterns Inorganic pigments usually have good light and color retention and low cost, but the pigments are dark (i.e not bright) and have low coloring power, while organic pigments usually have bright colors, high coloring power, high cost, poor light and color retention, etc of course, some large companies have light resistance of more than 7 levels (light resistance level 1-8, level 8 is the highest level), and weather resistance of more than 4 levels (weather resistance level 1-5, level 5 is the highest level) High grade), but the price is extremely expensive, so the price of the powder made of this pigment is also high According to the brilliance of the color sample and the price cost, the standard color formula is debugged Computer color matching and manual color matching computer color matching The production of colored powder coating with modern color matching technology is the direction of international development Computer color matching must have the following conditions: the hardware, spectrophotometer, computer, software, color matching program of the whole color matching system, the best production of an enterprise, the establishment process of basic data of computer color matching, the determination of the color of target color with spectrophotometer, and the conversion of it into telecommunication by computer Based on the comparison of the original stored basic data, the paint formula close to the target color phase is calculated As a report to the customer, the color must be measured by computer However, in some cases, computer color measurement is not suitable, such as metal powder, pearlescent, pattern powder, etc there are certain limitations in color measurement The most obvious is to directly add pigments to the powder coating products to adjust the color, and use the powder coating products of different colors to prepare the color There are basically no manufacturers in China to use computer color matching in the true sense, which is manifested in too many factors affecting the color change of powder coating, such as: temperature difference; color difference caused by the difference in production process that is difficult to control; color difference affected by different baking temperature; color difference caused by the weighing precision of pigment; color difference caused by computer extraction of pigment; other factors such as most pigments with hygroscopicity If the storage condition is not good, the water content will increase, and the pigment strength will decrease Manual color matching Due to the limitation of computer color measurement of powder coatings, manual color matching is still very important now Conditional manufacturers can do some databases to make a monochromatic board system experiment for a pigment, and make three color scales for a given pigment: high saturation color board with little or no white pigments; light color board with a large number of white pigments diluted; deep color board with black pigments added Color palette Through the establishment of the database, we need to obtain the following relevant information: the coloring power and covering power of the pigment, so as to obtain the degree of color change caused by temperature and time in the baking process The final result should be recorded in detail (such as the information of curing conditions, use and requirements, colorimetric conditions, and color difference range) With these information, we have a relatively sufficient performance for the pigment Be able to master Due to the limitations of instrument color matching, the final effect of instrument color matching depends on visual inspection, so artificial color matching is still the main method of color matching in the near future epilogue In recent years, with the continuous expansion of the application field of high-performance powder coating, different coloring styles also show a trend of diversification, and decorate a good space for people ' Perfect color! 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