General knowledge of paint: introduction to manufacturing process of paint (6)

Key tips: Section 5 color matching of coatings Color of paint: the color seen in diffuse sunlight Color is a kind of feeling that light stimulates people's eyes Color cannot exist alone without light, There is colorless light in the world, there is no colorless color The human eye can only feel the wavelength of 400-700nm visible light (white light) In 1666, famous scientist nemton first revealed the secret of white light He used a prism to decompose white light into seven kinds of monochromatic light: red, orange, yellow, green, green, blue and purple; And then we use a lens to gather these seven kinds of light Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: Section 5 color matching of paint color: color seen in diffuse sunlight Color is a kind of feeling that light stimulates people's eyes Color cannot exist alone without light There is colorless light in the world, and there is no colorless color The human eye can only feel the visible light (white light) with the wavelength of 400-700nm In 1666, the famous scientist nemton first revealed the secret of white light He used a prism to successfully decompose white light into seven kinds of monochromatic light: red, orange, yellow, green, green, blue, blue and purple Then he used a lens to gather the seven kinds of light together and restore them to white light Thus, people know that sunlight is composed of the above seven kinds of monochromatic light As an opaque material, when the visible light shines on it, it will absorb part of the light and reflect part of the light This part of the reflected light stimulates people's eyes and produces a feeling in people's brain, which is the color of the film we perceive According to the classification of chromaticity, it belongs to the category of "surface color" The coating film absorbs and reflects the visible light of all wavelengths on it evenly, forming a kind of color - achromatic In this way, a series of colors of white - light gray - medium gray - dark gray - Black constitute a kind of coating color - non color Fig 12.14 spectral reflectance of achromatic color Fig 12.15 spectral reflectance curve of achromatic and color the results of selective absorption and reflection of visible light by coating constitute another type of coating color - color For example, if the coating selectively reflects light of 480-560nm and absorbs light of other wavelengths, the coating will be green When the object reflects the long wavelength light of the visible spectrum and absorbs most of the short wavelength light below 580nm, the coating will be red The color of the coating is not its own property, but is affected by the following conditions: 1 The influence of light source 2 The influence of color contrast 3 The influence of physiological and psychological conditions of the observer Therefore, D65 light source is commonly used, close to sunlight It is very difficult to exclude the human interference to correctly evaluate the color of the "manual visual inspection" method commonly used in paint factories It is also because of this reason that it is necessary to develop a new color measurement method Every thing has its inherent characteristics If we grasp its characteristics to observe things, we can accurately evaluate or distinguish them Without exception, color has its own characteristics There are three characteristics of color coating: hue, value and chroma 1、 Munsell color system Munsell believes that a color can be determined by three parameters, namely, hue (hue), lightness (brightness) and chroma (color purity) 1 Hue: it is the characteristic of colors that are different from each other, indicating the position of colors in the spectrum 2 Value: the light and shade of the color The higher the reflectivity of an object to light, the higher its brightness 3 Chroma: the purity of color For the representation of a color HV / C e.g a color is 8.5r5.67/8.2, then it is: a red color with a hue of 8.5R; a lightness of 5.67; a hue of 8.2 for the neutral color of the black-and-white series without color, NV / is used 2 Color matching principle 1 Adjust the hue of the color: Chrome Yellow + iron blue → green; toluidine red + chrome yellow → orange red 2 Adjust the chromaticity of the color: add white on the basis of the color rendering, dilute the original color, and get the multi color with different chromaticity (i.e different shade) The preparation methods of chrome yellow, titanium white and polychrome paint are as follows: 1 Before color matching, we should first understand the color range of the color to be prepared and which pigments are composed of 2 add color paint slowly in the mixing condition, in line with the principle of adjusting the depth first and then adjusting the hue 3 The variety of toner should be as few as possible 4 In the process from wet film to film fixing, the floating and sinking of pigment have great influence on the film Therefore, after making the board, it must be placed for a few minutes before the color of the coating can be observed Four, the way to prepare the abrasive paint slurry 1 single pigment slurry grinding method 2 various pigment slurry grinding method 3 the comprehensive pigment slurry grinding method coating house is focused on the coating, diatom mud, paint coating, coating technology, fire retardant coating news and information and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration effect picture,