Environmentally-friendly water-based nanometer color paste and preparation method thereof

Abstract

The invention provides environmentally-friendly water-based nanometer color paste of which the average grain diameter is smaller than 100nm and reaches the real nano-scale. Meanwhile, according to the environmentally-friendly water-based nanometer color paste, the proportion of water-based pigments is increased, the color brightness of inkjet by the environmentally-friendly water-based nanometer color paste is improved, and the cost can be saved. The environmentally-friendly water-based nanometer color paste is high in stability and long in storage life. The invention further provides a preparation method of the environmentally-friendly waste-based nanometer color paste. The environmentally-friendly water-based nanometer color paste is prepared by adopting two steps, namely rough grinding and fine grinding.

Description

technical field [0001] The invention relates to the field of printing consumables, in particular to an environment-friendly water-based nano color paste, and also relates to a preparation method of an environment-friendly water-based nano color paste. Background technique [0002] Inkjet printing is a non-contact printing technology. The pattern is formed by mixing tiny ink droplets of different colors directly on the surface of the equipment. Therefore, the formation, shape and size of ink droplets are very important to the quality of inkjet printing patterns. At present, as the droplet ejection volume of commercial printing inkjet heads can be as small as 1pL, this puts forward higher requirements for the development and production of inkjet colorants. If the particles of inkjet colorants are too large, It is easy to block the nozzle. At present, there are already some nano-color paste products on the market, and there are also some nano-color paste patents on the Internet...

AI Technical Summary

Problems solved by technology

[0002] Inkjet printing is a non-contact printing technology. The pattern is formed by mixing tiny ink droplets of different colors directly on the surface of the equipment. Therefore, the formation, shape and size of ink droplets are very important to the quality of inkjet printing patterns. At present, as the droplet ejection volume of commercial printing inkjet heads can be as small as 1pL, this puts forward higher requirements for the development and production of inkjet colorants. If the particles of inkjet colorants are too large, It is easy to block the nozzle. At present, there are already some nano-color paste products on the market, and there are also some nano-color paste patents on the Internet, such as the invention patent with the publication number CN101629038A, "A water-based nano-color paste for digital inkjet Production method of pulp and container with ultrasonic generating device", a nano-color paste with material particle size fineness of 150-250nm is proposed. In "Pulp and Preparation Method", a kind of color paste with a particle size distribution of D99 [or d(0.99)] less than 1um is proposed. The publication number is the invention patent of CN101747687A. In its preparation method", a color paste with D99 ​​less than 1.2um is proposed. In other similar patents, the particle size that the color paste can achieve is basically in the same range. From the above patents, we can see that these "nano The particle size of "color paste" or "sub-nano color paste" is actually at a sub-nanometer level, not a real nano-color paste

[0003] On the other hand, as we all know, as the particle size of the object gradually decreases, the larger the ratio of the surface area to the volume, the stronger the adsorption capacity, so the phenomenon of agglomeration is more likely to occur. This phenomenon, on the one hand, restricts nano With the further development of color paste technology, it is difficult to achieve the nanometer level. On the other hand, even if the nanometer level is achieved, the shelf life of the nano color paste will be shortened sharply due to the phenomenon of agglomeration, and the stability is very poor. Therefore, the market is in great need of a Real nano-color paste, and the nano-color paste has good stability

[0004] On the other hand, in the inkjet colorant, the proportion of the pigment has a very important influence on the brightness of the pattern color sprayed by the inkjet colorant. The higher the proportion of the pigment in the inkjet colorant, the brighter the pattern color, and vice versa. , the color is dim. If you want to deepen the color, you need to increase the amount of inkjet, but this is equivalent to the increased cost of inkjet. Therefore, increasing the proportion of pigments in the color paste can save the cost of inkjet, but, The proportion of pigments cannot be increased without limit. In traditional inkjet colorants, the proportion of pigments is generally lower than 15%. This is because the increase in the proportion of pigments will increase the chance of colorant agglomeration. Therefore, this has also become a constraint for inkjet colorants. Factors that increase the proportion of pigments in the medium

[0005] The traditional preparation method of nano-color paste usually adopts mechanical grinding method, which is obtained by one-step grinding. On the one hand, the product obtained by such one-step grinding is difficult to meet the requirements of nanometer level, and on the other hand, the stability is also very low.

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