Coating paint ink coloring is a more complicated and meticulous work, because there are so many kinds of colors, you need to understand the performance of various pigments, and you need to accurately judge the color difference. In foreign industrialized countries, color matching is the use of color measurement and color matching instruments and computer programs, through the photoelectric spectrophotometer or spectrophotometer, to analyze the color and composition of the color plate, record the color in the form of digital, and input it into the color Color matching software program, calculate the proportion of various colors, and what color to add to achieve numerical indicators, and then color matching, accurate and fast. In the automotive repair industry, computer color measurement and color grading systems have begun to be widely used.

Another artificial preparation of multi-color paint, mainly based on practical experience, according to the required color paint template to identify the existence of several monochromatic components, the approximate proportion of each monochromatic, do the sample preparation experiment, and then prepare, but also It must be carried out in accordance with the basic principles of color science. The following techniques are used in the color matching process.

(1) Care should be taken when grading, generally try the sample first, and initially determine the quantity of the color matching paint, and then prepare the large sample according to the result of the sample. First adjust the secondary and secondary colors in a small container.

(2) First add the main color (the color is used in the color matching, the coloring power is small), and then the dark color (or color matching) with large dyeing power is slowly and intermittently added, and the stirring is continued, and the color change is observed at any time.

(3) “From shallow to deep”, especially when adding pigments with strong tinting strength, avoid excessive.

(4) In the color matching, there may be slight differences in the color of the coating film after drying and drying. The color of each paint is generally shallow when wet, and the color is deepened when the paint is dry. Therefore, if the sample is a dry sample, the color paint needs to be dried and then compared for color measurement; if the sample is a wet sample, the sample can be dropped into the color paint to see if the two colors are the same.

(5) It is necessary to know in advance the degree of floating of the primary color in the multi-color paint and the change of the paint, especially the amino paint and the perchloroethylene paint, which need more attention.

(6) When formulating complex color coatings, the coatings with the same properties should be selected and the solvent system should be mutually soluble. Otherwise, the miscibility of the coatings is not good, which will affect the quality, and even delamination, precipitation or gelation may occur. .

(7) Because the color often has a variety of different color heads, if the green color is matched, the yellow with green head and the blue with yellow head are generally used; when it is purple, the blue with red head and the blue head with blue head should be used. Red; when used with orange, red with yellow head and yellow with red head should be used.

(8) Pay attention to the auxiliary materials, such as drier, curing agent, thinner, etc., in the process of blending colors, so as not to affect the color.

(9) When blending gray, green and other double-color paints, due to the preparation of various pigments, the density and oil absorption of the pigments are different, and it is very likely that “floating color” and “floating” may occur, and at this time, a small amount may be added as appropriate. Surfactant or leveling agent, anti-floating agent to solve. As usual, 0.1% of silicone oil is added to prevent and control. The various surfactants produced by foreign companies need to distinguish which solvent system is used, and the amount of addition is generally 0.1% to 1%.

(10) The color paint film is slightly transparent, and the suitable base color can make the color of the top paint more vivid than the original paint. This is based on the principle of natural light reflection absorption, and the background color is superimposed with the original color. One color, the paint project is called "transparent color."

1, the color of the achromatic object

An achromatic object refers to a black, white, gray object that has a non-selective absorption characteristic of illumination light, that is, when the light is irradiated onto the achromatic object, the color light of various wavelengths in the absorbed incident light is equal; The reflected or transmitted light has the same spectral composition as the incident light. When white light is irradiated onto the achromatic object, the reflectance is above 75%, that is, it is white; when the reflectance is below 10%, it is black; when the reflectance is between the two, it is gray with different shades.

2, the color of colored objects

The colored object has the characteristic of selectively absorbing the illumination light, that is, when the light is irradiated onto the colored object, the colored light of various wavelengths absorbed in the incident light is unequal, and some are absorbed more, and some are less absorbed. When white light is irradiated onto a colored object, the reflected or transmitted light is not only reduced in brightness but also in spectral composition, and thus exhibits various colors.

3. The influence of the spectral composition of the light source on the color of the object

When colored light is irradiated onto the achromatic object, the color of the reflected light of the object is the same as the color of the incident light. When two or more colored lights are simultaneously irradiated onto the achromatic object, the color of the object has an additive effect. If red and green light illuminate a white object at the same time, the object is yellow.

When colored light is irradiated onto a colored object, the color of the object exhibits a subtractive effect. In contrast, a yellow object appears red under magenta light, green under cyan light, and gray or black under blue light.

4, the relationship between the color and light of the object

• non-self-luminous colour

The color produced by an object through illumination is a color that is not luminescent, such as color tickets, paints, fabrics, and the like.