Long-pressrun photosensitiser for printing of blanket and towel
A technology of photosensitive liquid and towel, which is applied in the field of plate-making photosensitive materials, can solve the problems of long plate-making cycle and physical injury of plate-making workers, and achieve the effects of avoiding harm to workers and the environment, improving plate-making efficiency, and reducing plate-making processes
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Embodiment 1
[0039] The preparation of embodiment 1 modified polyvinyl alcohol aqueous solution
[0040] 12% mass percent polyvinyl alcohol (polymerization degree 1700, alcoholysis degree 88%) aqueous solution, adjust the pH value to 2 with HCl, add 1.4% molar ratio of 1-methyl-4-formylphenylpyridinium methyl Sulfate, react at 80°C for 4-5 hours, then neutralize with alkene-added NaOH aqueous solution, adjust the pH value to 6-7, and obtain the preparation of modified polyvinyl alcohol aqueous solution.
Embodiment 2
[0041] The preparation of embodiment 2 modified polyvinyl alcohol aqueous solution
[0042] 10% mass percent polyvinyl alcohol (polymerization degree 1700, alcoholysis degree 88%) aqueous solution, adjust the pH value to 1.5 with HCl, add 1-methyl-4-formylphenylpyridinium methyl in 1% molar ratio Sulfate, react at 80°C for 4-5 hours, then neutralize with alkene-added NaOH aqueous solution, adjust the pH value to 6-7, and obtain the preparation of modified polyvinyl alcohol aqueous solution.
Embodiment 3
[0043] The preparation of embodiment 3 modified polyvinyl alcohol aqueous solution
[0044] 12% mass percent polyvinyl alcohol (polymerization degree 1700, alcoholysis degree 88%) aqueous solution, adjust the pH value to 2.5 with HCl, add 2% molar ratio of 1-methyl-4-formylphenylpyridinium methyl Sulfate, react at 75-85°C for 4-5 hours, then neutralize with alkene-added NaOH aqueous solution, adjust the pH value to 6-7, and obtain the preparation of modified polyvinyl alcohol aqueous solution.
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