HU202570B - Environment-protectingoil/water emulsion printing ink composition - Google Patents

Abstract

Field of the Invention The present invention relates to an environmentally friendly tin / water emulsion printing ink system comprising 60-851% pigment and oil-containing film-forming material, as well as 5 to 101% of conventional conventional printing additive / excipient. It is an object of the present invention to provide a macromolecular hydrophilic component, preferably hydroxyethyl cellulose, in the range of 10-301% by weight of the total composition. Scope of the description: 5 pages, without illustration HU 202 570 B -1-

Description

BACKGROUND OF THE INVENTION The present invention relates to an environmentally friendly oil / water emulsion printing ink system comprising a pigment and an oil-containing film forming agent and a printing agent and / or excipient known per se.

It is known that the function of printing inks is to transfer the image of the printing form onto a print medium (such as paper) and permanently fix it there.

Dyes are microheterogeneous two-phase systems containing pigments and binders.

In pigments, the pigment particles are surrounded by adsorption and solvate envelopes. Binding agent or wetting agent molecules with their polar group form an adsorption bond to the surface of the pigment particles (adsorption layer); and the remainder of the linked molecules form a temporary bond with the binder (solvate coat).

The traditional offset and letterpress composition is as follows:

pigment, binder, oily, additive - desiccant, antifouling agents, toxitroping agents

Within the above composition, for example, a choice of binder can be used to produce inks for printing on metal, photopolymer printing, or offset printing for offset printing, with various properties.

For example, U.S. Patent No. 3,010,833. U.S. Pat. No. 4,600,011 to emulsion starch, water, drying oil, polymerized cellulose ether in water before printing to prevent ink dripping, printing smudging. The solution therefore concerns an additive.

The CA. Publication No. 59,841c relates to the use of cobalt and manganese dryers in curved offset inks.

Nos. 2,001,897 and 2,081,974. French patents describe the use of starch in an offset dye additive to prevent sticking of prints.

The publication C A. 8114 744 q discloses a solution for using a new type of resin and polyethylene wax; according to the report, the quality of the printing ink can be improved in a simple way.

According to ACA 84 61311 h, the abrasion resistance of printing inks is improved with micronized polyethylene wax.

The CA. 92 24502 r describes a paint composition for dry offset printing, which is a water / oil emulsion.

The above solutions are usually used to increase the speed of printing inks and to reduce the amount of obstruction, grip, and smearing associated with stacking of the sheet prints.

Different inks (assembled on different machine types and on different media) therefore have different characteristics, so

Their theological properties, viscosity, yield strength, tack value, water uptake, media behavior and drying.

(The Tack value is the force required to rupture the paint layers rubbed on the rollers.)

The above properties are so fundamental that the printability and runnability of the inks depends on them.

Increasing print speeds requires low ink viscosity, tack value, and rapid print speed.

It is also known that the paper industry is a major cost factor in the production of a printing product. Both aesthetic and economic considerations should be taken into consideration when selecting the media.

It is advantageous to produce high quality prints on paper with a lower weight per g / m.

The reduction in the weight of paper per g / m ² and associated features such as the suction capacity, from the user's side, often make print quality uncertain. In addition to increasing turnaround time, printing and scrapping and reproduction machine operations and machine positioning also have a significant impact on cost efficiency.

When using lower-quality papers, ink breakage on the paper is common.

It is an object of the present invention to provide a composition of a new ink composition for use in varying quality and inferior papers, while providing a composition which is worm-friendly, while reducing the mineral content and maintaining increased printability and runnability. or other printing molds, with appropriate repair of higher machine speeds.

The new product produced by the process of the invention can adapt to changing paper grades, as recognized by the present invention, at the time of printing, when a paper-ink encounter occurs, a blocking component of the ink first penetrates the capillaries of the paper and seals the ink pathway. . This protects the other side safely from the risk of break-through. The composition according to the invention is stable and more effectively solves the problem which has been attempted so far by the use of additives. As far as is known, since stability could not be bifurcated, it was not possible to achieve the stated objective with a single formulation.

The essence of the environmentally friendly printing ink according to the invention is that it distributes a hydrophilic macromolecular substance dissolved in a polar solvent in an oil-based ink system. Our printing ink is hydrophobic, and during production, the hydrophilic component that seals the capillaries of the paper and retains the water to form the film on the print media without any impact is introduced.

-2EN 202570Β way to help. The hydrophilic component is present in an amount of 10-301% by weight of the composition. The ink according to the invention is thus an oil / diluent water emulsion.

The distribution of the hydrophilic component present in the system largely determines the dye behavior. In fact, in the technological process, a macromolecular solution is added to an oil phase with a high degree of dispersion. It cannot get close to the surface of the pigments at this stage, and the hydrophilicity of the pigments does not play a role in the uptake of the new component, not at the interface of the pigment binder but in the binder.

The main advantages of the paint system according to the invention are the following:

- abrasion rollers reduce paint flying; the use of ink enables high printing speeds;

- the ink color of the printing mold is significantly improved, the machine starting is free of waste;

- ink sticks to non-printing surfaces, resulting in higher productivity;

- the number of press washings is reduced;

- the tack value of the paint decreases;

- the speed of typing on paper is very good;

- the print is touch-proof, non-smearing and does not require extra energy for drying;

- does not damage the surface of low-strength papers and reduces paper dust,

- the specific ink consumption decreases and the color intensity of the ink film increases (no deflection). Print outlines are sharpened (raster sharpness).

Various paraffin oils utilize special narrow boiling point gas oil derivatives as well as lacquer oil additives to achieve a low tack value in known printing inks. This is a threat to another printing disease, licking. The growth of the pressed arc column behind the arc puzzle, on the backside of the arches, results in smearing and retraction from the fresh print in a simpler case. At higher tone values it causes the sheets to stick together.

In the case of the printing inks according to the invention, rapid absorption into the paper takes place from the moment the print is formed, and the solvent-free ink is colored with an instant drying effect. Thus, no retraction or sticking with the growth of the arch column can occur.

The hydrophilic component introduced is a nonionic, water-soluble cellulose derivative, more particularly hydroxyethylcellulose, which is soluble in water both cold and hot. The use of hydroxyethyl cellulose as a protective colloid in dispersions and as a viscosity increasing component in aqueous solutions is known.

However, the use of these properties in the present invention does not provide the novelty of a dye containing an aqueous "solution" of a macromolecule, but rather:

Hydroxyethyl cellulose retains the amount of water in which it is swollen, dissolved, and retained. Thus, the ink water content does not change during printing.

-The new component reduces the tack value of the paint to an appropriate degree.

Correct setting of the ink tack values is required both for transferring toner on the machine's abrasive rollers and for providing increased print speeds.

- Improves and increases the surface tension of the paint. This is the parameter that determines the amount of ink that is removed from the printing mold, exceeding the quality of the printing ink.

In our experiments, it has been shown that the best theological properties are best achieved if the technological order is established by the process of the invention, which is as follows:

1.) An amacromolecular "solution" is prepared separately from the dye, preferably in a rapid mixer, in a mixing trolley.

The viscosity of the "solution" is stabilized for up to 30 minutes.

2.) Prepare the pigment (carbon black paste in our experiments). This is done by pre-moistening the carbon black with an oily binder and dispersing it, for example, in a Drais pearl mill.

3.) The macromolecular "solution" is mixed into the 2-3 m pigment paste.

4.) The emulsion paint is further dispersed, preferably on a roller, which ensures an even distribution of the aqueous phase in the binder system.

In this process, high-printing inks can be produced for printing on Letterflex photopolymer, and stencil copying inks also have excellent properties when incorporated in the composition of the invention.

In principle, said macromolecule may also be incorporated in the composition of offset dyes. This toner will definitely come in contact with water during printing (wetting water) and the macromolecular solution introduced will control the amount and speed of water uptake, which will greatly affect the sharpness and drying of the print.

The composition of the ink system of the present invention is illustrated by the following examples. In the examples, the percentages are by weight of the total composition

The terms used in the Examples of Exemplification are as follows:

Gel-kernel is the chemically accepted and unambiguous name for a dye, a binder in which a gelling agent forms a cross-linking structure between the hydroxyl and carboxyl groups of the molecules cooked in mineral oil through hydrogen bridges. Thus, high viscosity is not achieved by increasing the dry solids content, but by increasing the molecules. The binder will have a high tack value in the former case and a low tack value in the latter case.

Phenol-modified pine resin brand name Budarint P-125 is manufactured by PEVDI, op. 125 'C, acid number 25 ml KOH / gr

Mallinate resin brand nameMaleinat C, manufactured by PEVDI, op. 128 'C, acid number 25 ml KOH / gr

Gelling agent: aluminum chelate, manufactured by MÁFKI

Soya alkyd: base based on soybean oil, acid number: 5-12, viscosity 30-35 Pa at 20 ° C, manufactured by TVK

Linseed oil alpha: base is linseed oil, acid number 12, vis3

-3HU 202570Β

6

501%, 50-65 Pa.s, manufactured by TVK.

Example 1

Carbon 181%

Tryphenylmethane Pigment 11% for Black Inks

Gel oven 141% (phenol modified pine resin, maleate type resin, petroleum with 260-290 'C fp range ΙΟΙ 2% aromatic content, linseed oil alkyd resin, gelling agent)

Hard resin binder 130 'C op phenol modified pine resin soybean spindle oil

The hydrophilic component is swollen with water

NatrosolHR250 (nonionic water soluble cellulose derivative, hydroxyethyl cellulose).

Example 2

Triphenolmethane Pigment Pigment Gel-Pig Mix Gel Binder (P-125MaleinatC 1: 1 by weight blend) Linseed Oil

extender

171%

6.251%

0.251%

0.251%

4.51%

13.5t% 30)

0.51%

20.01%

Blancfix (BaSCU)

Vinnophil (precipitated chalk)

Gel stove (composition containing Al-stearate, 101% of others, Example 1)

Odorless Petroleum 151%

301% hydrophilic component of Example 1

Experiments have been carried out to compare the parameters of the invention with conventional compositions of letterpress inks through its mechanism of action.

In the laboratory, Prüfbau printers were tested on a new type of ink, and in the printing house, the Cameron Sheridan machine was used to monitor the ink's behavior.

In accordance with the object of the invention, the inks should be suitable for safe printing on low-g / wt papers and should dry for 20 seconds without printing smudges.

The penetration of the oil-water phase into the paper is faster than that of the oil-only phase. The macromolecule blocks the breakthrough. "Solvent-poor" ink is more adherent to paper.

The ink according to the invention should also be more favorable for printing papers which are susceptible to dusting. Dust is due to the low surface hardness of the paper, which is less damaged if it comes in contact with a small sticky ink.

The results of comparative measurements of two different types of paint:

Traditional Paint (Cameron Deep Black, Budacolor) Paint according to the invention Tack value at 34 ° C on Tack-O-scope meter at 300 m.p ' ¹ circumferential speed 165 units 104-109 units Viscosity 46.7 Pa.s 5,3Pa.s 1927-4.5 Pa.s Rheotest rotary viscose 78 Pa shear 660 Pa shear meters 37 'C fesz.mellett fesz.mellett Toner Transfer Number Prüfbau printability tester 2.1 3.25

A positive change in tack value explains why the amount of ink distortion caused by ink remaining in the printing die during printing, when ink is broken, decreases the amount of non-printing surface clogging.

Flow curves constructed from a range of viscosity values at very low to very high revolutions show that the yield effect is lower for emulsion paints than for oil-based mines for the same purpose.

The increase in toner density is also positive for toner printability. Of the emulsion dyes, the 65 dye uptake is 15% giving a 1.4 D (density value) coverage, while the oil-only coverage offers 60% and 1.3 D coverage.

The quality of the paint is characterized by the change in the shade range. In this area, there is no significant difference between oil-only and emulsion paints.

So the point size change is not worse, the point change in the print point relative to the printing point is the same for the two inks. The sharpness of the image is not compromised by the addition of the aqueous component.

Emulsion paints do not show larger areas even at higher film thicknesses. This means,

Note that differences in ink supply (variable ink layers) on the printing press when printing emulsion ink will not cause a significant change in typeface.

The increasing ink layer fills the pores of the paper evenly so it does not create font growth. The above demonstrates the good printability of the ink. Runnability, which determines work productivity, is affected by the following conditions: paint drying speed and temperature (5-9% higher temperature required in the drying section). The frequency of form washes due to font distortion is reduced. 500,000 more books can be made with emulsion paint than oil-based books in the time it takes to print.

The effect of the addition of an anhydrophilic component was also investigated in the dye type recommended for stencil copiers. The following requirements apply to the main fires used here:

- Special stencil paper should be stained continuously;

- The ink should be able to diffuse into the printing surface of the stencil that has been opened while typing without the risk of drying;

- Copy paper should have a sharp print image;

- The print should be dried quickly, without smudging;

- Make sure that the toner is not permeable to the paper to allow double-sided copying.

Conventional paint consisted of gaseous carbon dispersed in pine resin, castor oil binder, occasionally an oil-soluble dye was deepened with black, and beeswax ensured the paint's abrasion resistance.

A small number of copies and only one side reproduction were available with toner. The stencil sheet's mesh structure was damaged in less time than desired.

The dye composition of the present invention does not damage the colloidal layer of the stencil sheet. Based on FÁIMÉI tests, you can use the highest number of copies possible.

Due to the dispersion of dye (penetrating 2-3 μm on the Grindometer) through the capillaries (20-30 μ) of the stencil, a perfect font contour is achieved. Due to the composition of the toner, we can meet the requirement that the dosing process be continuous without drying, but the duplicates on the copying paper will be quick, so that they can be copied on both sides.

Claims (4)

A cumin-sparing oil / water emulsion printing ink system comprising 60-85% pigment and oil-containing film-forming material and 5-10% conventional printing additives or excipients known per se, characterized in that the water-swollen macromolecule is a hydrophilic component based on the total weight of the composition. Contains 10301% hydroxyethyl cellulose. A printing ink system according to claim 1, characterized in that it contains carbon black as a pigment. The printing ink system according to claim 1 or 2, characterized in that it contains a gel furnace as an oil-containing film former. Printing ink system according to claim 1 or 2, characterized in that it comprises an oil-containing film former and a high melting point hard resin binder.