Lithographic fountain solution composition containing complex surfactants

Abstract

A lithographic fountain solution composition containing complex surfactants is composed of the complex surfactants, buffering electrolytes, water-soluble high-molecular compounds, aqueous germicide and algicide, aqueous antifoaming agents and water. The complex surfactants include two or more nonionic surfactants, anionic surfactants, cationic surfactants or ampholytic surfactants. The lithographic fountain solution composition containing the complex surfactants has the advantages of excellent dynamic ink-water balance performance, low requirements on quality of water for working solution preparation, high adaptability to changes of temperature conditions and the like; using the lithographic fountain solution composition can evidently improve quality of prints, improve printing efficiency and reduce production cost; in addition, the lithographic fountain solution composition contains no poisonous and harmful substances and is high in stability and long in storage time.

Description

technical field [0001] The invention relates to a fountain solution for lithographic printing, in particular to a composition of a fountain solution for lithographic printing containing a composite surfactant. Background technique [0002] Offset printing is a kind of modern lithographic printing, which is a printing method in which the graphics and text on the printing plate are transferred to the substrate by means of rubber (blanket). The function of dampening solution in offset printing is to use the principle of incompatibility of ink and ink to spread the water layer on the blank part of the printing plate, while the graphic part does not apply the water layer, but only absorbs the ink, so as to achieve effective separation from the blank part. This process is achieved through the synergy of several chemical components contained in the fountain solution, which mainly includes the following components: surfactants, buffer electrolytes, printing plate protection agents, ...

AI Technical Summary

Problems solved by technology

[0003] At present, the main problems of the dampening solution used in the field of lithographic printing are: (1) The speed of water-ink balance is slow: due to the increasing speed of modern printing, only one or two For this type of surfactant, the water film spreads slowly, so the water-ink balance speed is also slow, and the paper waste is serious when printing is started. At the same time, it is difficult to effectively distinguish the blank part from the graphic part, resulting in low quality of printed products; (2) dampening The printing adaptability of the liquid is poor: due to the wide variety of water quality conditions, temperature conditions and printing models in different regions, the adaptability of the printing dampening solution becomes poor. At the same time, the high-speed operation of the machine will also cause the printing environment to deteriorate, resulting in the The printing durability decreases, and the printing plate must be replaced in time, which will affect the printing speed and increase the printing cost; (3) The stability and environmental protection of the fountain solution itself: due to the complex chemical composition of the fountain solution, if the production If left unused for a long time, there will be problems such as poor product stability; and the traditional dampening solution also contains toxic volatile organic compounds (VOC) such as dichromate, isopropanol or alcohol, which is harmful to printing workers when used. hazards to health and the environment

[0004] CN103189213A discloses a fountain solution and fountain solution concentrate, which includes tert-amyl alcohol, surfactants, pH regulators, chelating agents, etc., and the surfactants used are mainly anionic and nonionic surfactants; CN101407144B Disclosed is a fountain solution composition for lithographic printing and a heat-fixed rotary offset printing method, which includes diol acyclic hydrocarbons, surfactants, wetting aids, chelating agents, etc., wherein the diols are not The cost of cyclic hydrocarbons is higher

At present, it has not been reported that two or more surface active substances are compounded for printing fountain solution compositions using the principle of synergy between different types of surfactants.