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A production method and process of magnesium alloy etched plate with protective film instead of back anti-corrosion paint

The invention relates to a method for producing a magnesium alloy etched plate, relates to a magnesium alloy material and its application in the field of printing plate making, in particular to a method for producing a magnesium alloy etched plate with a protective film instead of the backside anti-corrosion paint.

Background technique:

Magnesium alloys are widely favored by various industries due to a series of advantages. Among them, the demand for magnesium alloy sheets in the printing field is mainly manifested in bronzing printing and embossing, that is, magnesium alloy etching plates and magnesium plates. At present, there is a wide range of demand for magnesium plates in the printing field, and the demand is increasing sharply. As early as 40 years ago, magnesium alloy sheets have been widely used in the printing field, but they are mainly concentrated in European and American countries. The domestic copper plate and zinc plate have always been the main ones. The reason is that the special plate required for printing and plate making has never been produced in China. However, the damage of copper and zinc plates to the environment is very serious. At the same time, magnesium plates have great advantages in performance and cost performance in all aspects. Therefore, with the progress of domestic technology, more and more copper plates, The zinc version will be replaced.

Compared with the traditional zinc plate and copper plate, the magnesium plate has the following advantages: (1) Plate making time: when the etching pattern and etching depth are the same, the magnesium plate takes 5 minutes, the zinc plate takes 25 minutes, and the copper plate exceeds 30 minutes, which greatly saves When used for etching, the efficiency is improved; (2) Hardness: hardness is the main technical parameter for measuring the bronzing plate. When the temperature is below 50 °C, the Brinell hardness of the magnesium plate is 70, the zinc plate is 60, and the copper plate is 95. When the plate is heated to 100 °C, the magnesium plate has a hardness of 70. Plate hardness 65, zinc plate 30, copper plate 88. This means that when the temperature required for bronzing is reached, the hardness of the magnesium plate changes minimally. And this factor will directly affect the number of printings. Under the same conditions, the printing volume of magnesium plate and copper plate is more than 200,000 times, while that of zinc plate is less than 50,000 times; The slope is suitable, the edge is sharp, the hardness is high, and the heating and cooling are fast during the hot stamping production process. The surface of the substrate after hot stamping is very bright, similar to the copper plate effect, far exceeding the zinc plate; (4) Cost: in the same area , Under the same thickness and the same requirements, the cost of using magnesium plate is 30% lower than that of zinc plate, and 70% lower than that of copper plate. In the process of bronzing production, the production cost of magnesium plate is 10% lower than that of zinc plate and copper plate. (5) Environmental protection: Zinc plate and copper plate produce a large amount of waste liquid rich in heavy metal ions in the plate making process, which cannot be recycled, and causes serious environmental pollution. Magnesium is a recognized light metal, which is harmless to the human body and the environment.

The production process of the traditional magnesium alloy etched plate is mainly as follows: az31b magnesium alloy plate - shearing - aging treatment - double-sided sanding - cleaning and drying - drying - anti-corrosion paint on the back - heating and baking curing - photosensitive surface fine sand - Cleaning and drying - drying - coating the photosensitive layer on the front - heating and drying - standing - film on the photosensitive surface. Among them, it needs to be aired twice, and it also needs to apply anti-corrosion paint on the back and high-temperature baking and curing. Each drying basically takes about 24 hours. The application of anti-corrosion paint and its high-temperature curing and cooling also require a lot of time, which is time-consuming and labor-intensive, and anti-corrosion paint often Both contain a large amount of solvent, and the coating process will pollute the environment and cause harm to the health of operators. Therefore, it is necessary to improve the production process of magnesium alloy etched plates.