RU2244631C2 - Method for production of image and printing ink for realization of this method (modifications) - Google Patents

Abstract

FIELD: printing.

SUBSTANCE: the method consists in the fact that a one-piece linear contour pattern determining the image boundaries on the whole and its details is applied by a black ink not containing color dyes, and a dotted pattern with the use of an ink containing organic hydraulic dyes of different color are applied inside the one-piece linear contour pattern.

EFFECT: improved quality of image.

12 cl

Description

The invention relates to the field of printing, in particular to printing technologies using flexographic printing or offset printing without wetting and printing inks with a water-soluble ink composition, which provides the printing of colorless outline drawings and images on paper, the colors of which appear when exposed to water. The invention can be used in the manufacture of children's illustrated books for coloring or other printing publications for special purposes.

Known printing methods based on applying ink to a printing form and transferring ink from the printing form to the medium by creating a tight contact between them. The prototype of the proposed method, you can take the method of obtaining images, including transferring onto paper a dye composition forming the desired pattern, disclosed, for example, in patent RU 21917700 C2, IPC7 41 M 1/00, 10.27.2002. However, this method does not allow to obtain a contour colorless image on paper, the colors of which appear under the influence of water.

Inks for letterpress or offset printing are widely known in the art, which, in addition to the dye, contain a binder resin, a solvent, mineral and polymerized oils. So the prototype for the first version of the proposed paint adopted the composition of the paint disclosed in RU 2059677, IPC C 09 D 11/10, 05/10/1996, which includes pigment (dye), phenol-formaldehyde resin, alkyd resin, oil solvent and desiccant.

Printing inks for gravure and flexographic printing have been used for a long time. Such paints also contain coloring agents that bind the resin and the solvent. As a solvent, a water-alcohol solution is used. Solvents are required to form a substrate in which most of the resin is dissolved and the dye is finely dispersed. After printing, the solvent evaporates to obtain a thin film of dry resin, which contains the aforementioned coloring matter. Such paint is known, for example, from the USSR author's certificate No. 861378, IPC7 C 09 D 11/10, 09/07/1981, which can be taken as a prototype of the proposed paint. Known paint contains a pigment that can provide either a black color (when using carbon black), or any other color (when using colored pigments).

The disadvantages of the known paints include the impossibility of obtaining colorless formed impressions, i.e. when used, there is no effect of color manifestation under the influence of water. This is due to the fact that the binder used prevents the dye from dissolving in water, while the dye is not well dispersed and unstable during printing and storage.

The objective of the invention is to develop a method of obtaining a black and white image on paper, the colors of which are manifested under the influence of water, as well as to obtain a composition of black ink containing special types of dyes, soluble in water, which provides when painting, for example, with a brush dipped in water, color image.

This problem is solved by the fact that in the method of obtaining the image, which consists in transferring the coloring composition forming the necessary pattern onto the paper, a continuous linear contour drawing is applied that defines the boundaries of the image as a whole and its details, with black ink that does not contain color dyes, but inside a solid linear a contour drawing is applied to a bitmap using a paint containing organic water-soluble dyes of various colors, while a printed pattern is used to obtain a color image moisten with the formation of a color image in the area of the bitmap. To obtain an image, both high and offset, as well as gravure and flexographic printing can be used.

This problem is also solved by the fact that the printing ink for letterpress and offset printing without wetting (tipofset) contains a dye, a binder and a solvent, while it additionally contains a polymerized vegetable and / or mineral oil, contains carbon black and soluble as a dye in water, an organic dye that does not show its color properties before dissolving in water, an alkyd and phenol-formaldehyde resin as a binder, and an oil solvent as a solvent , With the following component ratio, wt.%:

Carbon black 5-20

Alkyd Resin 2-6

Phenol formaldehyde resin 3-20

Polymerized Vegetable Oil 1.5-5

Mineral oil 15-35

Organic Dye 15-50

Oil solvent rest

Depending on the type of paper used for printing, the ink may contain a desiccant in an amount of 0.9-2.0 wt.%. This ingredient is added when using coated paper and may not be contained in ink when printed on paper that is sufficiently absorbent (uncoated). As an oil solvent, IHO or scriptan can be used. As a polymerized vegetable oil can be used sunflower, linseed and other vegetable oils. As organic dyes, the paint may contain any of a number of known direct active and acidic dyes. As carbon black - soot furnace or chimney.

The viscosity of the obtained paints that satisfy the above composition is from 6 to 20 Pa / s.

According to another embodiment, the composition of the ink for flexographic and intaglio printing, containing a dye, a binder and a solvent, contains carbon black as a dye, as well as an organic dye that does not show its color properties before dissolving in water, and rosin-maleic resin as a binder , as a solvent - absolute ethyl alcohol, as well as ethyl cellosolve and additives for dispersing carbon black, in the following ratio of ingredients, wt.%:

carbon black 3-7

rosin-maleic resin 20-40

organic dye 15-20

ethyl cellosolve 1-3

dispersion additives

carbon black 0.01-0.15

ethanol

absolute rest.

As organic dyes, the paint may contain any of a number of known direct active and acidic dyes. As carbon black - soot furnace or chimney. As additives for dispersing carbon black, surface-anionic substances are used.

The method of obtaining an image using paints of the given composition is based on the application of a solid linear contour drawing that defines the boundaries of the image as a whole and its details, black ink that does not contain color dyes, and a bitmap inside a solid one using paints containing dyes of various colors. When water is applied to the printed pattern, the dot pattern is blurred, forming a color image, which is due to the water solubility of the dyes that make up the composition. The solid linear black contour is not washed out, while the black or gray color of each point of the bitmap remains, which is ensured by the inertness to water of such components as carbon black and binder. The printed image is formed on several (from 4 to 6) printing sections separately, while the sequence of applying paints can be any. Depending on the type of printing used (high and offset, deep and flexographic), the composition of the corresponding ink is selected.

In the manufacture of paint, in accordance with this invention according to the first embodiment, in the first step, a black paint concentrate is obtained by mixing carbon black, alkyd, phenol-formaldehyde resin (SPS) and polymerized linseed and mineral oil in a mixer. Then, the resulting concentrate is dispersed in a three-roll paint machine, if necessary, drier is added and diluted in the mixer with an oil solvent to a viscosity of no more than 18 Pa / s. After that, a dry direct active or acid dye is added to the black paint with stirring and the mixture is additionally dispersed to a dispersion of 10 mm. Then, if necessary, the ink is once again diluted with mineral oil or with an MGO solvent to the required viscosity, depending on the type of printing: for letterpress printing - at least 6 Pa / s, and for standard printing - at least 19-20 Pa / s. In this form, the paint is ready for use. To obtain a solid contour line, black ink made in an intermediate step can be used. When color dyes are introduced into opaque black ink, it acts as a binder and allows one to obtain the required printing, technological and coloristic properties of the resulting ink.

The following are the characteristics of the raw materials used.

Oil solvent

MGO (TU 0258-037-00151742-99)

T the beginning of the boil, ° C 250

T the end of the boil, ° C 290

Aniline point, ° С 90

Density, g / cm ³ 0.76-0.78

Scriptan (imp.)

T the beginning of the boil, ° C 280

T boiling point, ° C 310

Aniline point, ° C 82-86

Density, g / cm ³ 0.826-0.832

Cured linseed oil.

(TU TZPK 371-94)

Acid number, mg KOH 12

Color on the iodometric scale 20

VZ viscosity -2.5 at 25 ° С 110-140

Mineral oil

MP-5 (TU 36590 / 260-91)

Density at 20 ° С, g / m ³

Aniline point, ° С

Color on the iodometric scale

Kinematic viscosity at 20 ° С, mm ² / s

Desiccant 1463 (imp)

Mixed drier: 70% dry oxides of ZnO, MnO and CaO in mineral oil.

Phenol formaldehyde resin SFM-1 or SFM-2.

As dyes, the following can be used:

Bright red 5CT, Bright orange 4KT, Dark blue 2KT, Green ST, Yellow 2KT, Red-violet 2KT, Yellow-lemon CT, etc.

An oil solvent is used to control the drying speed of the inks; resins allow you to adjust the printing properties of the inks, such as viscosity and “stickiness”. Mineral oil is mainly used to dilute the paint, and vegetable polymerized oil is necessary to create the necessary paint structure and obtain an elastic and sufficiently quickly cured paint film.

According to the second option (for gravure and flexographic printing), black contour ink is also obtained, which includes special types of dyes that create a color or color when exposed to water. Alcohol is used as a solvent.

The following ingredients were used to make the paint:

1. Soot furnace or chimney (carbon black) H 354, PM 75 or other brands.

2. Resin rosin-maleic with a melting point of 130-140 ° C with an acid number of 140-160 RC 12 OJSC "TZPH".

3. Organic active dye (dispersed) in accordance with the above brands.

4. Ethyl cellosolve.

5. Additives for the dispersion of soot (SV-102, BIG-034, EFKA 7315).

6. Absolute ethyl alcohol.

At the first stage, rosin-maleic varnish was made by obtaining a mixture of RC-12 resin and ethyl absolute alcohol in equal proportions. Then the mixture was stirred under a dissolver at room temperature and a speed of 500 rpm for 3-4 hours. To make black paint, K-354 carbon black, the resulting rosin-maleic varnish, ethyl cellosolve, and dispersion additive were mixed. Soot dispersion in varnish was performed on an attritor or bead mill to a dispersion of 10 μm.

To make the dye concentrate, the active dye was mixed (100% or depending on the color) and an additive for dispersion with absolute ethyl alcohol. Dispersion is carried out in a ball mill for one hour.

In the manufacture of color dye compositions, the prepared black paint is mixed with a dye concentrate and absolute ethanol. In this form, the paint is ready for use.

The drawing is represented by a dotted outline in each color using colored dye compositions and a solid outline (linear) along the border of the drawing itself using black ink without dyes. When water is applied to the printed pattern, the dotted outline is blurred to form a color image of various colors. At the same time, the black linear contour, as well as the black and gray points, are not blurred. A similar effect is due to the water solubility of the dyes that make up the black ink and to the water insolubility of the main components of the black ink (pigment and soot) and the binder (varnish 50% RC-12).

Table 1 shows specific examples of the manufacture of printing ink according to the first embodiment of the invention. In table 2 - according to the second option.

Table 1

No. p / p name of raw materials Content, wt.% 1 2 3 4 5 6 1. Carbon black K-354 12.7 11.9 14.5 10,2 13.6 8.5 2. Alkyd resin D 4100 5.2 5,0 5.3 3,5 4.8 2,5 3. Phenol formaldehyde resin SFM-1 or SFM-2 10.0 13.0 15.7 11.5 14.7 8.0 4. Oil solvent IGO 12.0 10.0 12.5 10.5 11.5 7.0 scriptan (t ° _kip. = 260-280 ° C) 2.1 1,1 2.2 2.2 1,6 1,0 5. Mineral oil MP-5 30,0 25.3 30.5 19.6 30,2 21.3 6. Flax polymerized oil N-05 3.0 2,5 2,8 1,5 1.8 0.8 7. Desiccant 1463 (Zn, Mn, Co) - 1,2 1,5 1,0 1.8 0.9 8. Dye active yellow 2KT 25.0 - - - - - active bright orange 4KT - 30,0 - - - - active dark blue 2KT - - 15.0 - - - active green ST - - - 40,0 - - red-violet 2KT - - - - 20,0 - acid yellow dye 2 “3” - - - - - 50,0

table 2 No. name of raw materials Content, wt.% 1 2 3 1. Carbon black 3 5 7 2. Resin-Maleic Resin 40 thirty twenty 3. Ethyl cellosolve 1 2 3 4. Dispersion Additives 0.01 0.02 0.15 5. Absolute ethyl alcohol 40,99 44.98 49.85 6. Dye (acc. To table 1) Red
Yellow
Navy blue fifteen
-
- -
18
- -
-
twenty

Claims (12)

1. A method of obtaining an image, including transferring a coloring composition forming the necessary pattern onto paper, characterized in that a continuous linear contour drawing is applied that defines the boundaries of the image as a whole and its details, with black ink that does not contain color dyes, and inside a continuous linear contour drawing apply a dot pattern using a paint containing organic water-soluble dyes of various colors, while to obtain a color image, the printed pattern is moistened with mations color image in the bitmap area. 2. The method according to claim 1, characterized in that the pattern is applied by letterpress or offset printing without wetting. 3. The method according to claim 1, characterized in that the drawing is applied by gravure or flexographic printing. 4. Printing ink for gravure or offset printing without wetting, containing a dye, a binder and a solvent, characterized in that it further comprises a polymerized vegetable oil, mineral oil, as a dye contains carbon black and a water-soluble organic dye that does not show its coloristic properties before dissolving in water, as a binder, an alkyd and phenol-formaldehyde resin, and as a solvent, an oil solvent, in the following ratio mponentov, wt.%: Carbon black 5-20 Alkyd resin 2-5.5 Phenol formaldehyde resin 3-20 Cured vegetable oil 1,5-5,0 Mineral oil 15-35 Organic dye 15-50 Oil solvent rest 5. Printing ink according to claim 4, characterized in that it additionally contains a desiccant in an amount of 0.9-2.0 wt.%. 6. Printing ink according to claim 4 or 5, characterized in that as the polymerized vegetable oil, it contains sunflower, or linseed, or other vegetable oil. 7. Printing ink according to any one of claims 4 to 6, characterized in that, as an organic dye, it contains any of a number of direct active and acid dyes. 8. Printing ink according to any one of claims 4 to 7, characterized in that, as carbon black, it contains soot furnace or chimney. 9. Printing ink for flexographic or intaglio printing, containing a dye, a binder and a solvent, characterized in that it contains carbon black as a dye, as well as an organic dye that does not show its color properties before dissolving in water, as a binder - rosin-maleic resin, absolute ethyl alcohol as solvent, and ethyl cellosolve and additives for dispersing carbon black in the following ratio of ingredients, wt.%: Carbon black 3-7 Resin-Maleic Resin 20-40 Organic dye 15-20 Ethyl cellosolve 1-3 Carbon black dispersant additives 0.01-0.15 Absolute ethyl alcohol Rest 10. Printing ink according to claim 9, characterized in that as organic dyes it contains any of a number of direct, active and acid dyes. 11. Printing ink according to any one of paragraphs.9 and 10, characterized in that as carbon black, it contains soot furnace or chimney. 12. Printing ink according to any one of paragraphs.9-11, characterized in that as additives for dispersion of carbon black, it contains surface anionic substances.