Colorful
A semi-product made from pigments or pigments and fillers dispersed
Semi-products made of pigments or pigments and fillers dispersed in a paint.
Color paste classification
Those with pure oil as adhesive are called oil-based pastes. Resin-based pastes are those that use resin lacquer as the adhesive. Since there are many types of lacquers, there are also many types of color pastes. In order to make the pigments and so on better dispersed in the paint, often in the manufacturing process, add a small amount of surfactant, add zinc naphthenate and so on.
Color paste, as the name implies, is a kind of pigment concentrated paste, which is developed by using different pigments, through the technology of surface treatment and surface wrapping of the pigments, and through a rigorous processing process. According to the different solvents used in color paste, color paste is divided into water-based color paste, oil-based color paste, water-oil general color paste, etc.; according to the different uses of color paste is divided into paint color paste, tape color paste, paper color paste, textile color paste, mechanical color paste, toy color paste, latex products color paste, etc.; according to the use of color paste tools are different, people simply divided into factory color paste and machine color paste, etc.. The color paste in the natural world is collaborating to dress up the whole world: from small to dressing, daily use, toys, etc., to large to bridges, houses and buildings, etc., all of them are showing colorful colors.
History of color paste
Traditional paint coloring is the use of pigment powder directly added to the paint, or some paint manufacturers themselves simply make the pigment into a slurry, and then added to the paint to color the paint. This has certain disadvantages: such as bad color reproducibility, uneven coloring, no professional technology and process, pigment particles are coarse, coloring power is not high, pollution is serious, added to the paint, the paint into the film after the light resistance, poor weather resistance, easy to fade, chalking, etc..
With the intensification of market competition, the division of labor is becoming more and more detailed, the call for high-end coatings is getting higher and higher, in the 1990s, the domestic color paste manufacturers came into being, at first one or two manufacturers specializing in color paste; in fact, in foreign countries, in the 1960s, there are specialized color paste manufacturers, more famous brands such as Clariant, Degussa, Hibiscus, etc., then some domestic quality conscious paint manufacturers However, the price was relatively high, such as iron oxide series of color paste, the price was even as high as about 100 yuan a kilogram, then the domestic color paste manufacturers rose, the price also came down relatively, from more than 30 yuan per kilogram, down to more than 10 yuan per kilogram now. On the one hand, the technology and equipment are improved, and the cost is under control; on the other hand, the competition is getting fierce, and some manufacturers have lowered the profit.
Nevertheless, the quality of the color paste product has improved a lot compared with the beginning, and the variety has been improved. There are one or two color paste manufacturers at the beginning, and now there are 20 to 30, mainly in Jiangxi, Zhejiang, Shanghai, Guangdong, etc.
Color paste selection
According to the object of coloring and environmental requirements, color paste is mainly divided into two kinds of sun-resistant and non-sun-resistant. Generally, for internal use, if the system is not compatible, the principle is to achieve the lowest cost of color requirements, and sunlight resistance is not required. And for external use, the following factors must be considered.
a. Light and weather resistance.
b. Chemical media resistance (mainly acid and alkali resistance).
c. Compatibility with the use system.
d.Coloring strength, covering power and color spreading.
e.Matching between color paste and color paste.
f. Storage stability of color paste.
Generally, the color retention of external coatings is quite strict, so when choosing color paste, we should pay special attention to the light and weather resistance and acid and alkali resistance of color paste. Under the premise of good compatibility, coloring power, covering power, color spreading and storage stability, the mutual matching of color paste is also crucial. As far as possible, we should choose single color paste with superior performance such as light and weather resistance, but in fact, they are often compound colors, so it is best to follow the principle that the performance of inorganic and inorganic, organic and organic or light and weather resistance is close to (1/25ST washout, light resistance should be 7~8 or 8 grade, weather resistance should be 4~5 or 5 grade), so as to ensure the color retention in outdoor, and to avoid the coloring color paste weather resistance performance due to Obvious differences, resulting in a long time caused by fading or uneven color and flowering and other coating film defects.
Disadvantages of color paste
Paint color paste storage time is too long, the color will deepen, which is caused by the evaporation of water in the paint color paste. At present, commercially available paint color paste contains less than 20% of pigment, which is because the filter cake containing water is usually used for processing. Because the paint color paste contains too much water, so it is not only easy to evaporate in summer, but also freeze in winter. Therefore, the storage time of the purchased paint color paste should not be too long, otherwise it is difficult to control the amount.
At present, the paint color paste is developing to high concentration, mainly using dry filter cake processing, adding the corresponding dispersant and wetting agent and glycol can be made into the paint thick paste containing 30%-50% of pigment. This can overcome the above drawbacks.
Recommended reading.
Compound color ink blending skills
What is color masterbatch and the basic knowledge of color masterbatch
The performance of masterbatch pigment
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