Coating technology: application of powder coating in color matching

Core tips: 1 Pigments commonly used for powder coating color matching Pigments for powder coatings can be classified according to production methods, composition, structure and function (1) According to the production method, it can be divided into 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, phthalocyanine, azo, polycyclic pigments, etc (2) According to the function of powder coating, it can be divided into coloring pigment and physical pigment (also known as physical pigment Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: 1 The pigments used in powder paint Toner can be classified according to production method, composition, structure and function (1) According to the production method, it can be divided into 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, phthalocyanine, azo, polycyclic pigments, etc (2) 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 (3) 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 2 The hue of powder coating in the process of color matching 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 that black is not "black", that is, the problem of color 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 3 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 4 Computer color matching and manual color matching (1) computer color matching Using modern color matching technology to produce colored powder coating 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 the target color by spectrophotometer, and the conversion of it into electricity by computer Signal, with the original storage of the basic data for comparison, calculated close to the target color of the paint formula 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 (2) 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 the temperature and time during the baking process The final results should be recorded in detail (such as curing conditions, uses and requirements With the information of colorimetric conditions and color difference range, we have a full grasp of the performance of the pigment 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 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 Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration 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