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Yuan Lei tells you | paint color palette-basic paint and color paste

Release time:

2024-01-29 09:38

 

Yuan Lei tells you | paint color palette-basic paint and color paste

 

1. base paint

 

The so-called base paint, in simple terms, is the paint enterprise's own production of white paint or varnish (does not contain the hiding power of the pigment). The base paint is the carrier of the color, and the control of the base paint in the color process will affect the accuracy, reproducibility, compatibility, economy and color gamut of the color. At the same time, the base paint is the only part of the integrated color system in the factory store that is prepared by the paint company itself. Therefore, different base paints make the use and effect of the color system have significant differences. Base paint because of its different formulations, the scope of use of different, there are great differences, in order to improve the manufacturer's base paint in the use of integrated color matching system and give full play to the advantages of the system, the need to adjust the base paint.

Influence of Batch Color Difference of (I) Base Paint on Tone System

 

The base paint produced by the enterprise, if the product batch is different, there will be color difference between the base paint of each batch. These color differences will cause a large deviation in the color results. Experiments have proved that due to the comprehensive analysis of the color results of different batches of basic paint, the color difference of basic paint needs to be controlled below 0.3, which will have little effect on the final result of the color system.

Effect of Compatibility of (II) Base Paint and Color Paste on Final Result of Tone System

 

The compatibility between the base paint and the color paste affects the accuracy and economy of color mixing, and the compatibility can be seen through the finger research test and the method of mixing the color paste with the base paint and standing for a long time.
The so-called finger test, that is, take 100 g of white paint, add 2~3g of color paste to be tested, fully stir evenly, and then apply it on the surface of the coated material. When the paint film is about to dry, grind the surface part of the coating film with your fingers. After the paint film is dry, observe whether there is color difference between the parts rubbed with your fingers and those without rubbing. If the difference is large, the compatibility between the color paste and the tested coating is poor, this color paste out of the paint easy to produce floating color phenomenon. If the color is the same, generally does not produce floating color phenomenon.
Experiments show that when the compatibility of the finger color difference below 0.5, the final result of the color accuracy and economic impact are small.
The method of mixing the color paste with the base paint and then standing is to add the selected color paste into the base paint, stir and mix evenly, stand for 24 h, and observe whether there is floating color (pigment delamination). If pigment delamination occurs, it indicates that the compatibility between the color paste and the base paint is not good.

Effect of titanium dioxide content division of (III) base paint on color system

The division of titanium dioxide content in base paint is mainly based on the requirements of color gamut and economy, as well as the requirements of coating on hiding power and the influence of the maximum addition amount of color paste on coating performance. Only after comprehensive consideration of these factors can a reasonable division be made.

There are many ways to divide the titanium white content in the base paint that can meet the color gamut coverage and economy. Now there are 4 kinds of titanium white content base paint systems and 2 kinds of titanium white content base paint systems. However, after comprehensive consideration of the economy, color cost, inventory savings and other comprehensive factors and market demand for color, according to the actual situation of the enterprise itself, to determine the number of titanium white content of the basic paint system. For example, the base paint of a certain system is divided into three kinds of titanium white content, namely, the titanium white content of A paint is 18% ~ 23%, the titanium white content of B paint is 7% ~ 13%, and the titanium white content of C paint is 0.

 

 

2. color paste

The color paste here mainly refers to the water-based color paste. Water-based color paste refers to the organic or inorganic pigments in the wetting and dispersion of surfactants (can also be added to the water-soluble resin), the formation of uniform, stable, with a certain degree of fluidity or thixotropic fluidity, a strong coloring strength of the concentrated pigment paste. There are two kinds of water-based color paste system: one is a high pigment content resin system; the other is a low pigment content resin (general resin, other single resin) system. Among them, the former pigment concentration is high, the coloring power is strong, the color performance is good, the compatibility is good, has the thixotropic fluidity, generally does not cause the floating color and the flower, the auxiliary agent selection is reasonable, has the versatility. The latter has a relatively low pigment concentration, but it has good tinting strength, good color development, and stable fluidity and viscosity. The system contains resin, and the compatibility needs to be tested, otherwise it will easily lead to floating color or hair. The color of oily paint is generally made of pigment slurry ground by the enterprise itself.

The requirements of the (I) color system for the color paste and the effect of the color paste on the system.

Color paste as a coloring body, in the integration of color at the same time affect the accuracy of color, reproducibility, compatibility, economy and color gamut coverage of all system performance.

As an integrated color paste, it has higher requirements in terms of physical and chemical indicators, mainly in terms of viscosity and drying speed of the color paste, which requires good adaptability to the color mixing equipment to meet the equipment requirements. In addition, there are more stringent requirements for the batch stability of the color paste, and the control of the batch color difference is an important guarantee for the accuracy and reproducibility of the system.
The effect of the compatibility of the color paste on the system is mainly the economy of color toning and the reproducibility of color toning. The compatibility of the color paste is mainly manifested in the flocculation, coarse or precipitation of the pigment from the paint. These phenomena will cause the coloring power of the color paste to decrease, so that the amount of the color paste increases, the color paste is not evenly distributed in the coating, etc., will directly affect the color economy and accuracy.

Selection of color paste for (II) toning system


 


From the perspective of color gamut, the selection of the color paste needs to have a kind corresponding to each main color in the color circle to meet the color gamut requirement of the color palette. An integrated color system that fully takes into account the cost and performance index of the color system will be equipped with about X Y color paste to meet different needs. Among them, X is a common color paste for internal and external walls, which can be used for small batch retail or off-site projects as samples. The Y branch is a supplement to the factory's high-concentration color paste, taking into account the need for exterior wall color weather resistance and attractive cost advantages.

From the performance point of view, the choice of color paste requires the use of high environmental resistance pigment varieties to meet the requirements of exterior wall color. For organic pigments, due to the particularity of the crystal structure and the pigment particle size is smaller than inorganic pigments, it has the advantages of bright color, high saturation and strong coloring power. But the pigment is not as fine as possible. The smaller the particle size of the pigment, the larger the specific surface area, the more light energy absorbed, and thus the stronger the unit coloring power. However, unfavorable methods also follow. If the particle size is small, the damage effect of water vapor, oxygen and other substances on the pigment will be greater, which will lead to poor weather resistance of the pigment. This is also one of the reasons why some organic pigments have larger original particle size and better weather resistance.
Therefore, latex paint exterior paste is not the finer the better pigment. The same pigment index of the color paste, although some of the fineness is small, high tinting strength, but its weather resistance is not at least guaranteed. Especially for the color paste of the color system, its fineness should be controlled within the appropriate range. Appropriate fineness, that is, to achieve the best number of effective coloring particles, helps to relatively improve the weather resistance of the color paste.
From the economic point of view, the integrated color system color paste, need to fully consider the use of the same color gamut high concentration color paste, to reduce the cost of color.

 


 

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Tell, toning, base, pigment, system, content, compatibility, influence, economy, coloring

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