Developing solution for positive-type PS plate and preparation method thereof

Abstract

The invention discloses a developing solution for a positive-type PS plate and a preparation method thereof. The developing solution comprises the following raw materials by weight: 60-65% of distilled water, 15-20% of a developer, 8-15% of a protectant, and 2-5% of a wetting agent. The developer is a mixed solvent of sodium hydroxide, potassium hydroxide and sodium silicate, the protectant is oneor more of sodium phosphate, potassium chloride and sodium chloride, and the wetting agent is a mixed solvent of a silanol nonionic surfactant and an anionic surfactant. The developing solution provided by the invention adopts the mixed solvent of potassium hydroxide and sodium silicate as the developer, is a weak base developing solution, lowers the corrosion performance, reduces waste liquid discharge, and has the characteristics of fast developing speed, stable performance and long service life. The wetting agent involved in the invention adopts the mixed solution of a silanol nonionic surfactant and an anionic surfactant, has good wettability and dispersion uniformity, and improves the developing uniformity.

Description

technical field [0001] The invention relates to the technical field of printing, in particular to a developing solution for a positive-working PS plate and a preparation method thereof. Background technique [0002] In the field of printing technology, development is a key step in making plates, which affects the quality and stability of the final plate making. Many plate making problems often occur in the developing process. The principle of development is to partially dissolve the exposed and decomposed photosensitive layer (positive PS plate) with a developer, so that the printing plate forms two parts, image and non-image, which is called development. At present, in the preparation process of developing solution, sodium hydroxide is mostly used as the main developer. Sodium hydroxide is a strong alkali, which has an erosive effect, reduces the film retention rate on the plate surface, and can also damage the oxide film on the blank aluminum plate base after development. ...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: To solve the defects and deficiencies of the prior art, sodium hydroxide is mostly used as the main developer. Sodium hydroxide is a strong alkali, which has an erosive effect, reduces the film retention rate on the plate, and can also make the blank aluminum after development The oxide film of the plate base is damaged, and it is not conducive to environmental protection. After many practice improvements, the applicant has designed a positive-type PS plate developer and its preparation method.