Lithographic printing plate
A lithographic printing plate and lithographic printing technology, which is applied in the field of printing plates, can solve problems such as difficulty in using two plates closely bonded together, poor mechanical strength of the light-absorbing layer, etc.
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Embodiment 1-3
[0096] Synthesis of Hydrophilic Polymers
[0097] Inject 400 grams of water into a 1000cc flask, fill with nitrogen to remove oxygen in the solution, and then heat up to 80°C. When nitrogen gas was filled into the flask, the monomer solution was continuously added dropwise into the flask, and the whole dropping process was about 3 hours while maintaining the internal temperature at 80°C. The monomer solution contained 120 grams of acrylamide, 30 grams of acrylic acid, and 77 grams of water. Simultaneously, the initiator aqueous solution that 0.5 gram of potassium persulfate is dissolved in 50 gram of waters is also added together. After the dropwise addition was completed, the polymerization was continued at 80°C for 2 hours, and then kept at 90°C for 2 hours. Finally 150 grams of water are added. The pH value was adjusted to 5.0 with sodium hydroxide solution, and thus an aqueous solution of the hydrophilic polymer was synthesized. Photosensitive composition
[0098] Sub...
Embodiment 4-6
[0106] The synthesis of the hydrophilic polymer is the same as that of the hydrophilic polymer in Example 1. The difference is that the unsaturated monomers shown in Table 2 are added instead of acrylamide. The amount of the crosslinking agent and light absorber shown in Table 2 is the same as that of Example 2 in the preparation of the photosensitive material. In order to improve the adhesion, a 2-micron-thick butyral resin is pre-coated on a 0.2-mm-thick aluminum plate as a primer, and then it is coated with a photosensitive composition and heated at 150°C for 1 hour to make a 2-micron-thick photosensitive film. The base version of the layer. Using this base plate, image formation can be accomplished in the same manner as in Example 1. The surface and cross-section of the photosensitive layer of the printing plate can be observed through a microscope. It can be concluded that in each of the examples it can be observed that in the non-irradiated area, the cross-linking age...
Embodiment 7-9
[0112] Synthesis of Hydrophilic Polymers
[0113] Inject 400 grams of water into a 1000cc flask, fill with nitrogen to remove oxygen in the solution, and then raise the temperature to 80°C. When nitrogen gas was filled into the flask, the monomer solution was continuously added dropwise into the flask, and the whole dropping process was about 3 hours while maintaining the temperature at 80°C. The monomer solution contained 90 grams of acrylamide, 30 grams of acrylic acid, 10 grams of hydroxyethyl methacrylate, 20 grams of acrylonitrile, and 77 grams of water. At the same time, an aqueous initiator solution prepared by dissolving 0.5 gram of potassium persulfate in 50 gram of water was added. After the dropwise addition was completed, the polymerization was continued at 80°C for 2 hours, and then kept at 90°C for 2 hours. Finally 150 grams of water are added. The pH was adjusted to 6.0 with sodium hydroxide solution, thus synthesizing an aqueous solution of the hydrophilic p...
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