Method for improving moisture dispersibility of gravure composite printing ink

Abstract

The invention relates to a method for improving the moistening and dispersing performances of a gravure composite printing ink. The method is characterized by comprising the following implementation steps that: in the process of preparing the printing ink, a macromolecular weight polyurethane moistening and dispersing addition agent is added; a chemical structure of the additon agent is formed by adding a special pigment anchor group or a segmer on a polyurethane copolymer; the molecular weight is between 20000 and 50000 Mw; the addition agent is suitable for various printing ink resin systems and the moistening and dispersing needs of the pigment; the method for adding the addition agent comprises the following steps that: the addition agent can be directly added in the process of printing ink production; the total adding range is counted according to the addition agent solid/the pigment and filler solid portions of 2 to 40 portions/100 portions; or the addition agent is directly added in the printing process according to the need and the quality of printing ink without adding a diluter; the adding amount of the addition agent in the printing process accounts for 1 to 2 portions/100 portions of the printing ink; and the addition agent is evenly stirred and can be used. The method has simple process and obvious effect and effectively improves the product quality.

Description

technical field [0001] The invention relates to a method for improving ink performance, in particular to a method for improving the wetting and dispersibility of gravure composite ink. Background technique [0002] At present, in the ink preparation process and printing process, the color development of the pigment in the ink production process, the fluidity of the ink, the stability of the ink storage, the stability on the machine during the printing process, and the resolubility of the ink are all directly related. Whether the ink product meets the requirements of the times is an important technical indicator, and it is also an important prerequisite for the survival of ink manufacturers. [0003] The traditional production principle is based on one or several related resin binders used for composite printing as the main body, additives, solvents, etc., plus pigments, but this traditional ink has the following disadvantages: [0004] 1. In the printing process, "dirty pla...

AI Technical Summary

Problems solved by technology

[0004] 1. "Dirty plate" and "impression roller sticking" are prone to occur in the printing process

[0005] 2. Prone to gambling version phenomenon

[0006] 3. The ink has poor fluidity and is easy to foam

[0007] 4. In the production process of ink, due to poor wetting performance, it often leads to poor color development and fluidity of pigments

[0008] 5. The stability of the ink on the machine is poor, so it is not suitable for long-term printing

[0009] The above disadvantages are mainly caused by the improper selection and use of dispersing wetting agents.