Urethanated unsaturated water-soluble vinyl multipolymer and preparation method thereof

Abstract

The invention relates to an urethanated unsaturated water-soluble vinyl multipolymer and a preparation method thereof. The urethanated unsaturated water-soluble vinyl multipolymer is a vinyl multipolymer containing the following structure unit: -A-B-C (-X)-D-, wherein A represents a styrene structure unit; B represents a (methyl) acrylonitrile structure unit; C represents a vinyl copolymerization unit containing branched hydroxyl; D represents a vinyl copolymerization unit containing a branched hydrophilic group; and X represents a C unit branched hydroxyl grafted unsaturated mono isocyanate structure unit. The polymer is applicable to manufacturing chemistry-free CTP boards.

Description

technical field [0001] The invention belongs to the technical field of printing, and in particular relates to a urethanized unsaturated water-soluble vinyl multi-component copolymer and a synthesis method thereof. Background technique [0002] Lithographic printing technology has moved from traditional laser phototypesetting film copying PS plate technology to computer-to-plate technology (CTP technology for short), and CTP plate materials are gradually becoming popular. There are many types of CTP plates, and the more popular ones include silver salt diffusion CTP plates, UV-CTP plates, purple laser polymerization CTP plates, thermal CTP plates, etc. At present, the development of a new generation of environmentally friendly and chemical-free CTP plates is a hot spot in the development of plates in the world. [0003] There are many technical routes for developing environmentally friendly chemical-free CTP plates, which can be divided into thermal ablation technology, pola...

AI Technical Summary

Problems solved by technology

EP0980754 introduced the technology of carboxyl decarboxylation to achieve hydrophilic-hydrophobic transformation, but the molecular weight of the phase-change compound is too large, the energy threshold becomes larger, and decarboxylation is difficult, so the printing durability of this technology is poor

WO94 / 23954 introduces a microcapsule hot-melt technology. Laser hot-melt destroys the microcapsules, and the hydrophilic substance is destroyed and turned into hydrophobic, but the damaged objects are likely to cause pollution in the blank space of the printing; US4004924 introduces a thermoplastic hydrophobic particle and hydrophilic adhesive. A mixture of binders, but not resistant to printing; Agfa EP 2006-5-24 06114475.4, CN200780018820 introduced a semi-continuous emulsion method to manufacture thermoplastic particles of styrene and acrylonitrile emulsion, which can realize hot melting, but does not contain self-emulsification Hydrophilic groups, high requirements for particle control technology, poor emulsified emulsion stability, need to add antimicrobial agent; Kodak US 2005-8-3 11 / 196, 124, CN200680028684 introduced a polyalkylene oxide chain segment Adhesive polymerized with hydrophobic cyano side groups, the molecule is a one-dimensional linear structure, does not contain double bonds, and cannot participate in the crosslinking of the plate, so the printing resistance is affected; Kodak US 2006-7-27 11 / 494, 235. CN200780028508 introduces a solvent-resistant polymer containing hydrophilic groups and cyano side groups, containing allyl ester branches, which is formed by condensation reaction of carboxyl side groups and allyl halides under the action of alkali, but There are many side reaction by-products, post-processing is troublesome, and the ester group is still not resistant to printing; Fujifilm JP 2000-7-13 2000-213142, CN01120259 introduce a lithographic printing plate precursor, which contains a three-dimensional polyisocyanate pre-crosslinked structure and Polymers containing hydrophilic graft chains, although the three-dimensional pre-crosslinked structure improves the printing durability of the plate, but reduces the on-machine developability of the plate

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