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Waterborne ink for planographic press and preparation method thereof

A printing machine, water-based technology, applied in the direction of ink, application, household utensils, etc., can solve the problems of water-based ink production and use less, achieve fast printing speed, fast drying, and overcome the effect of slow drying

Active Publication Date: 2016-08-03
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, water-based inks are rarely produced and used in the market

Method used

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  • Waterborne ink for planographic press and preparation method thereof
  • Waterborne ink for planographic press and preparation method thereof
  • Waterborne ink for planographic press and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of monomer dimethylolphenol a: Take phenol and put it into a three-necked flask, add water with 4 times the mass of phenol and stir to dissolve, add formaldehyde (37% aqueous solution) with 2 times the mole of phenol and stir evenly, add 10% of the total solution mass Sodium hydroxide is catalyzer, stirred and reacted at room temperature for 12 hours, after the reaction (thin-layer chromatography can be used to monitor the reaction process), dilute hydrochloric acid is added to neutralize to neutrality, and after extraction with ethyl acetate, monomer a (dimethylolphenol ).

[0017] Preparation of hyperbranched hydroxymethylphenol A: monomer a is configured into a 10% (mass percent) ethanol solution, adding 4% of the total solution mass of ammonia as a catalyst, heated at 60°C for 6 hours to obtain hyperbranched polymer A (hyperbranched Hydroxymethyl phenol), after measuring, number average molecular weight 1100, weight average 3350, degree of branching 80%....

Embodiment 2

[0021] Preparation of (4-((4-hydroxyphenyl)(4-((oxiran-2-yloxy)methyl)phenyl)methyl)phenol)dihydroxyepoxy b: Take trihydroxytrimethylbenzene and add it to a three-necked flask, add trihydroxytrimethylbenzene 1 times of water and 3 times of tetrahydrofuran were stirred and dissolved, and equimolar epichlorohydrin was added to trihydroxytrimethylbenzene and stirred evenly, and sodium hydroxide accounting for 5% of the total solution mass was added, and stirred and reacted at room temperature for 6 hours. After the reaction ( The reaction process can be monitored by thin-layer chromatography), vacuum distillation, and extraction with ethyl acetate to obtain monomer b (dihydroxyl epoxy).

[0022] The preparation method of hyperbranched polyhydroxy epoxy B: the monomer b is configured into a 10% (mass percentage) ethanol solution, adding 1% of the total solution mass of sodium hydroxide as a catalyst, and heating at 60°C for 4 hours to obtain a hyperbranched polymer B (hyperbranche...

Embodiment 3

[0026] The preparation method of hyperbranched polyamide C: take aminoisophthalic acid and put it into a three-necked flask, add 1 times its mass of water and 3 times its mass of ethanol and stir to dissolve, heat at 60°C, stir and react for 6 hours, after the reaction is finished (you can use a thin The reaction process is monitored by layer chromatography), distillation under reduced pressure, and extraction with ethyl acetate to obtain hyperbranched polymer C (hyperbranched polyamide). After measurement, the number average molecular weight is 1020, the weight average is 5900, and the degree of branching is 75%.

[0027]

[0028] Get 60 parts (mass) of the hyperbranched polyamide (C) prepared above, under the rotating speed>600r / min, 10 parts of nano silicon dioxide (mass), 20 parts of red organic dye (mass), 10 parts of water (mass) , disperse at high speed and fully wet the powder, grind on a three-roller machine, and the fineness is <10μm, that is, water-based ink for l...

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Abstract

The invention discloses a water-based ink for a lithographic printing machine and a preparation method thereof. In parts by mass, the composition includes 30-85 parts of hyperbranched polymer, 2-20 parts of filler, 5-20 parts of pigment and 1-15 parts of water. The hyperbranched polymer is one or more of hyperbranched hydroxymethylphenol, hyperbranched polyhydroxyl epoxy and hyperbranched polyamide. The water-based ink prepared by the present invention is a special water-based ink for lithographic printing, which is completely different from water-based inks of other printing methods such as gravure printing, flexo printing, and silk screen printing. In order to adapt to the high-speed operation of lithographic printing machines and the characteristics of no obvious physical concave-convex structure of lithographic plates, the present invention adopts hyperbranched polymers as ink main binders, so that the water-based ink of the present invention has features that are not available in general water-based inks and can be applied to lithographic printing. Features of high solid content and high viscosity. Compared with the existing lithographic printing ink technology, the special water-based ink prepared by the invention does not need to use odorous, toxic, and high-boiling organic solvents, and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of printing ink preparation, and in particular relates to a water-based ink for a lithographic printing machine and a preparation method thereof. Background technique [0002] Lithography is one of the main printing methods at present, and it is also the most widely used printing method. Different from traditional printing processes such as gravure printing and letterpress printing, the blank part and the graphic part of the printing plate of lithographic printing are almost on the same plane. Lithographic printing uses the law of mutual repulsion of oil and water to form an oleophilic and hydrophobic graphic part and a hydrophilic and oleophobic blank part on the same plane of the printing plate. When printing, the printing plate is wetted with "water" first, and then the ink is applied, and after the transfer of the blanket, an imprint is formed on the substrate. With the evolution of technology, the lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/103C09D11/102C09D11/033
Inventor 杨明刘云霞宋延林王旭朋唐新颖
Owner INST OF CHEM CHINESE ACAD OF SCI
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