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Negative image flat printing plate precursor and method for fabricating flat printing plate

A lithographic and negative printing technology, applied in the field of negative lithographic printing plate precursors and the preparation of lithographic printing plates, can solve the problems of less number of papers to pass through the machine, high-quality dots, and inability to adapt to UV ink printing, etc., to achieve Good compatibility, improved printing resistance, strong adsorption effect

Active Publication Date: 2019-05-14
LUCKY HUAGUANG GRAPHICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a negative-working lithographic printing plate precursor and a method for preparing a lithographic printing plate from it. After the laser scanning exposure, the plate can be directly installed on the printing machine for printing without any processing steps, and the present invention overcomes the disadvantage that the processing-free lithographic plate prepared by the above-mentioned various methods cannot be adapted to UV ink printing, and guarantees With less number of pass-through papers and high-quality dots at the same time, the printing durability of UV ink printing is improved

Method used

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  • Negative image flat printing plate precursor and method for fabricating flat printing plate
  • Negative image flat printing plate precursor and method for fabricating flat printing plate
  • Negative image flat printing plate precursor and method for fabricating flat printing plate

Examples

Experimental program
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Effect test

Synthetic example 1

[0082] 168 gram of hexamethylene diisocyanate, 298 gram of pentaerythritol triacrylate and 1g of dibutyltin dilaurate catalyst were added in the 1000mL four-necked flask with thermometer, stirrer and nitrogen gas introduction device, under N 2 Under protection, stir and react at 60°C for 8 hours. The -NCO content is no longer decreased by chemical titration. Add 102 grams of N-methylolacrylamide and keep the temperature until the characteristic absorption peak of 2235cm-NCO measured by infrared spectroscopy disappears completely. About 570.0 g of urethane acrylic oligomer B1 containing amide groups was obtained.

Synthetic example 2

[0084] 168 gram of hexamethylene diisocyanate, 298 gram of pentaerythritol triacrylate and 1g of dibutyltin dilaurate catalyst were added in the 1000mL four-necked flask with thermometer, stirrer and nitrogen gas introduction device, under N 2 Under protection, stir and react at 60°C for 8 hours. Use the chemical titration method to determine that the -NCO content will no longer decrease. Add 164 grams of N-p-hydroxyphenylacrylamide and keep the temperature until the characteristic absorption peak of 2235cm-NCO measured by infrared spectroscopy disappears completely. . About 632.0 g of polyurethane acrylic oligomer B2 having amide groups were obtained.

Synthetic example 3

[0086] 168 gram of hexamethylene diisocyanate, 298 gram of pentaerythritol triacrylate and 1g of dibutyltin dilaurate catalyst were added in the 1000mL four-necked flask with thermometer, stirrer and nitrogen gas introduction device, under N 2 Stir and react at 60°C for 8 hours under protection. The -NCO content is no longer decreased by chemical titration. Add 178 grams of N-(p-hydroxyphenyl)methacrylamide, keep the temperature, and measure the characteristic absorption of 2235cm-NCO by infrared spectroscopy. until the peak disappears completely. This gives about 645.0 urethane acrylic oligomers B3 having amide groups.

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Abstract

The invention discloses a negative image flat printing plate. The negative image flat printing plate comprises a layout base and an imaging layer, wherein the imaging layer is arranged on the layout base and comprises (1) a polymer binding agent; (2) an initiating system which can be used for triggering polymerization / crosslinking during imaging exposure; and (3) a polymerizable / crosslinking constituent which comprises a urethane acrylate low polymer containing amide group or sulfamide group. The defects of insufficient durability of a processing-free flat printing plate fabricated by the method in a background technology is overcome, the defect that the processing-free flat printing plate fabricated by the method in the background technology cannot be applicable to UV ink printing is overcome, and the durability during UV ink printing is improved as well as relatively a few start-up transfer paper and high quality are ensured.

Description

technical field [0001] The invention belongs to the technical field of printing plate making, and in particular relates to a negative-working lithographic printing plate precursor and a method for preparing a lithographic printing plate therefrom. Background technique [0002] The preparation of lithographic printing plates is well known in the printing industry. The plate-making process of the lithographic plate requires at least two steps to complete. One is to expose the plate coated with the photosensitive composition to a specific light source through a mask (such as a positive film type and a negative film type mask), thereby forming One is the latent image of the light image; the other is to carry out a so-called subsequent development step on the exposed printing plate, through which the excess coating is removed. Pre-coated photosensitive lithography is a sheet-like material supported by aluminum or polyester, and can be prepared through the above two steps to have...

Claims

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Application Information

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IPC IPC(8): G03F7/00G03F7/032B41C1/10
Inventor 杨青海宋小伟吴兆阳吴俊君杨婧
Owner LUCKY HUAGUANG GRAPHICS