Fixative solution formula

Abstract

The invention discloses a fixative solution formula. According to the formula, a solution A and a solution B are contained, wherein the solution A is prepared by the following steps: sequentially adding 500ml of distilled water, 65g of anhydrous hydrochloric acid, 235ml of acetic acid, 38g of boric acid and 76g of aluminum chloride, then adding water until 1000ml of solution is achieved. The solution B is prepared by the following steps: adding 300g of sodium thiosulfate and adding water until 1000ml of solution is achieved. The formula is applied by adding one part of the solution A into four parts of the solution B and uniformly mixing. According to the fixative solution formula, the fixative solution is easy to store and has a small possibility of decomposing at high temperature.

Description

technical field [0001] The invention relates to a formula of a fixer in the process of making a photopainting base plate. Background technique [0002] The conductive pattern of the printed board, the solder mask convex shape and the character pattern are all realized by making the bottom plate of the photosensitive film to realize the pattern transfer. The production of the bottom plate plays an important role in ensuring the quality of the graphics on the printed board. The method of making the bottom plate is one of the main processes in the manufacture of the printed board. All image latent images need to be processed in a darkroom such as fixing to form a graphic photo master, and then mirrored and copied to achieve the master required for design and production. The latex layer on the surface of the photosensitive film contains a certain amount of silver halide. The silver halide in the latex film that has not been affected by light is not affected by the developer, b...

AI Technical Summary

Problems solved by technology

However, the existing fixer solution contains aluminum potassium sulfate, which is not suitable for long-term storage. When the temperature is high, it is easy to decompose sulfur and turn into milky white. It can be stored for 3 months when it is fully sealed and the temperature is 18°C ​​during the shelf life.