KR20020072687A - A easy dispersion pigments, manufacturing process of that and printing-ink used of that - Google Patents

Abstract

PURPOSE: Provided are an easy dispersing pigment which overcomes problems and disadvantages of existing dry powder, wet cake and intermediate form thereof, a method for preparing the same, and a printing ink using the same. CONSTITUTION: The pigment has average particle size of 1-100 micron and moisture content of 5-15 wt%. The method for preparing the easy dispersing pigment comprises semi-drying a wet cake of pigment. The printing ink is produced by preparing the easy dispersing pigment and then mixing a predetermined amount of varnish(resin) into the pigment. The pigment shows low dust scattering and excellent handling property. The pigment can be easily produced by existing equipment without requiring a special device.

Description

A dispersible pigment, a manufacturing method and a printing ink using the same {A easy dispersion pigments, manufacturing process of that and printing-ink used of that}

TECHNICAL FIELD This invention relates to a dispersible pigment, its manufacturing method, the printing ink using the same, and its manufacturing method.

Since organic pigments are usually used in ink or the like in the form of particles, the form of the pigment such as its crystalline form, particle size and moisture content greatly affects the pigment properties. In general, as the pigment form, various kinds of forms such as dry powder, wet cake, and the middle thereof can be considered by focusing on the water content, and all of them have been carried out. Iii) there was a request for improvement.

That is, as for the pigment of a dry powder form, the following point became a problem.

(1) Agglomeration of molecules occurs by drying, and dispersibility is broken, and concentration does not come out under normal dispersion. For this reason, in order to disperse | distribute until a normal concentration comes out, stronger dispersion energy is needed.

(2) In drying, dust tends to come out in the grinding step and subsequent handling, and the working environment is deteriorated.

(3) In the drying step, for example, a dry powder having a water content of 3% or less is used, which requires considerable time and energy.

On the other hand, the wet cake is excellent in dispersibility because there is no process such as drying, but the following drawbacks are pointed out.

(1) Due to the high water content, there are many restrictions on use and its use is limited. For example, when used in aqueous Flexo printing inks or aqueous Gravure printing inks, the water content of 50% or more is considerably restricted in use.

(2) There are many uses that require separation of water, and this process is unreasonable in terms of operation because it is unreasonable in operation and drainage. For example, in the case of ink-wetting the wet cake of the pigment for printing ink, there is an operation of separating water from the varnish (resin) and the wet cake by a kneader or the like, which requires considerable time and effort. In addition, there are drains that require environmental sanitation.

(3) The transport of wet cakes is economically unreasonable. Especially in case of exporting to overseas, it is very economically unreasonable because of high transportation cost with high water content.

(4) Wet cakes are difficult to store, especially for a long time, because the moisture cake is apt to cause aggregation and crystal growth of pigment particles. This is particularly problematic for exports that require a long time from transport to use.

(5) Since wet cakes have a lot of moisture, pigments having a poor water resistance may cause hydrolysis to impair the original characteristics of the pigments. Specifically, the coloring power (the strength and weakness of the color-producing concentration) and the color change with time. For example, Brilliant Carmine 6B (CIRed 57-1), which is generally used as the three primary colors for offset printing inks, is prolonged by prolonged and / or high temperature contact due to calcium lake pigments. Calcium ions separate and cause hydrolysis, which significantly impairs the pigment properties.

(6) Since wet cakes have a lot of moisture, they also originate in the chemical structure, but as the crystal grows, the particles become large and the coloring power greatly decreases. For example, Diazo Yellow pigment (CIYellow 12), which is generally used as a three primary color for offset printing inks, causes particles to grow after prolonged contact with water, resulting in opacity and deterioration of coloring power. Results in. Since transparency is required for the offset of C.I.Yellow 12, opacity is a major drawback of the pigment characteristics. In particular, in the case of export to overseas, etc., the growth of particles is further promoted by both sides for a long time and a high temperature, which is a serious problem.

Furthermore, in the case of the intermediate form of the dry powder and the wet cake, both advantages are introduced to improve the shortcomings, but the original advantages cannot be maintained, and the disadvantages of each are still present. It is not necessarily sufficient in terms of stability, heteroscedasticity, rationality of logistics, handling or manufacturing cost.

MEANS TO SOLVE THE PROBLEM The present inventors used the pigment of a predetermined | prescribed water content and average particle as a result of earnest research and examination which should improve the problem and fault which the said dry powder, a wet cake, and the intermediate form have, and a fault should be improved. The inventors have found that a dispersible pigment which can solve the problem at once, and which can be industrially advantageously produced, has finally been completed.

The present invention is a di-disperse pigment, characterized in that the average particle diameter substantially maintaining a flexible aggregated state is 1 to 100 µm, and the water content is 5 to 15% by weight. Here, average particle diameter is the measured value by the objective microscope.

In addition, the present invention is a semi-disperse pigment having an average particle diameter of 1 μm-100 μm and a water content of 5-15% by substantially semi-drying the wet cake obtainable in the manufacturing process of the pigment. It is a manufacturing method of.

Furthermore, the present invention is a printing ink characterized by using a dispersible pigment having a flexible agglomerated state and a substantially flexible average particle diameter of 1 mu m-100 mu m and a water content of 5-15% by weight.

Furthermore, the present invention semi-drys the wet cake of the pigment to produce a didisperse pigment having a substantially flexible average particle diameter of 1 to 100 µm and a water content of 5 to 15% by weight, and then a predetermined amount of varnish to the dispersible pigment. It is a method for producing a printing ink, characterized in that by mixing and mixing.

One of the features of the present invention is to use a pigment having a mean particle size of 1 to 100 mu substantially maintaining a flexible agglomerated state, but further, to use a pigment having a water content of 7 to 13% by weight. Here, when the moisture content is 5% or less by weight, aggregation tends to occur, dispersibility deteriorates, and dust tends to come out. On the other hand, when the water content is 15% or more by weight, atomization becomes difficult, and in particular, the atomization of 1 µ-100 µ in the present invention is difficult.

The most preferable state of the present invention is a di-disperse pigment, characterized in that the average particle diameter substantially maintaining the flexible aggregated state is 10 µ-50 µm, and the water content is 7-13% by weight.

The di-disperse pigment of the present invention is semi-drying the wet cake of the pigment obtained in the pigment manufacturing process by a dryer, for example, a continuous belt dryer, a box-type aeration dryer, etc.,

It is industrially advantageously produced by pulverizing this to a predetermined average particle diameter in a pulverizer such as a hammer pulverizer, a needle pulverizer or a pin mill. The moisture content of the wet cake of the pigment used here is 65-85% by weight normally, and a preferable water content is 70-80% by weight.

Moreover, this invention is the manufacturing method of the printing ink characterized by mixing a varnish of predetermined amount with the didisperse pigment manufactured by the above-mentioned method. A feature of the present invention is to provide a dispersible pigment having an average particle diameter of 1 to 100 µm and a water content of 5 to 15%, which substantially maintains a flexible agglomerated state, thereby maintaining most of the advantages of the prior art. The problems of the prior art can be solved at once, such as suppressing the disadvantages as early as possible and manufacturing them by an extremely industrially advantageous method.

Conventionally, various kinds of medicines, additives, solvents, and the like are conventionally used for improving dispersibility, improving the logistical surface and dust pollution, but the heterodisperse pigments of the present invention are consistent. By carrying out the operation and the preparation means, it is advantageously produced industrially and easily, and furthermore, there is almost no restriction on the use for the printing ink.

Specific examples of the pigment used in the present invention include AZO, DISAZO, anthratinone, futarocyanine and condensed organic pigments. Among them, it is effectively applied to AZO pigments commonly referred to as LAKE pigments, which tend to cause aggregation problems when powdered.

The didisperse pigment of the present invention can be handled in exactly the same way as the color pigment such as coloration by mixing and blending. The didisperse pigment of the present invention is advantageously used for producing an aqueous Flexo ink, for example. In this case, a predetermined amount of varnish, the didisperse pigment of the present invention and other additives are added, predispersed, and inkized by a disperser such as a beads mill, but the predispersed pigment of the present invention is predispersed. It is possible to produce industrially advantageous inks which are extremely heterogeneous including, and excellent in the gloss and coloring power of the obtained ink.

In the case of producing an offset printing ink, the heterodisperse pigment of the present invention is mixed with a predetermined amount of varnish, and the desired heat dehydration (vacuum dehydration is preferred) is followed by a simple roll rotation.

In this case, it is not necessary to separate a large amount of water such as wet pigment (water content of 65 to 85%), and it is not necessary to drain water of the separating water (commonly called flushing water). It is extremely effective industrially on a continuous ink production system.

In addition, the mixture of the heterodisperse pigment and the varnish may be mixed with various kneaders, for example, kneaders such as pranetari mixers and trimixes, Although a mixer, a beadsmeal, and the like are used, in particular, by using a heat-and-water-dehydrating mixer such as a pranetari mixer and a trimix, a significant reduction in the work of extracting ink can be achieved. There is an advantage such that the present invention can be devised, which is a preferred embodiment of the present invention.

In addition, since the dispersible pigment of the present invention is powdery and fluid, it has the advantage of being capable of continuous quantitative supply, continuous production of ink, and facilitation of FA. Moreover, in this invention, even if it adds surfactant, various resin, etc. suitably in the process for the purpose of a pigment characteristic, etc., it is not difficult at all.

[Example]

Next, the present invention will be described in more detail according to the examples. In an Example, a part and% represent a weight part and weight%.

Example 1

p-toluizin-m-sulfonic acid was coupled with a diazo component and β-okisinaphtholic acid as a coupling component in an aqueous solvent, followed by addition of rosin and calcium chloride, followed by filtration. The resultant was washed with water to obtain a wet cake (water content of 75% by weight) of the monoazo lake pigment. This is put into a continuous belt dryer and dried by hot air to obtain a semi-dried pigment having a water content of 12% by weight. This is pulverized by a hammer type grinder to obtain a dispersible pigment having an average particle diameter of 35 mu.

Next, using this heterodisperse pigment, the following formulation

150 parts of heterodisperse pigment of the present invention

400 parts of resin varnish

According to this, the mixture is mixed at 50 ° C. using a mixer, and at the same time, the temperature is raised to 95 ° C. while mixing with vacuum dehydration. Next, an ink for offset printing was created by simply passing the 3 roll. It was excellent in workability in the manufacturing process of ink, and the obtained ink was excellent in coloring power, transparency, and gloss.

For comparison, the results compared with powder pigments and wet cakes of the same chemical structure are shown in Table 1.

color Coloring Transparency Polish Liquidity * 3 Handleability * 4 Powder Pigment * 1 Standard 100% Standard Standard Standard Standard Didisperse Pigment of the Invention (Example 1) Vividness 110% Transparency Excellent Good Good Wet Cake * 2 Vividness 110% Transparency Excellent Good bad

* 1 Pigment normally dried with the same dryer using the same wet cake and ground by the same mill (water content 1% by weight)

* 2 Wet cake (water content 75%) as it is

* 3 with a parallel plate viscometer.

* 4 Mainly handleability of material.

Example 2

Coupling was carried out in a water-soluble solvent using 1-acetacetylaminobenzene as a coupling component and 3,3'-dichlorobenzidine as a diazo component, and rosin and an activator were added, followed by heat treatment, followed by filtration and washing with water. To obtain a wet cake (water content 78%) of the Disazo pigment. This is placed in a continuous belt dryer and dried by hot air to obtain a semi-dry pigment having a water content of 10% by weight. This is pulverized with a needle mill to obtain a dispersible pigment having an average particle diameter of 20 µ.

Next, using this disperse pigment, the following formulation

100 parts of heterodisperse pigment of the present invention

Suji Varnish 400

According to this, the mixture is mixed at 40 ° C. using a mixer (Pranectari mixer), and the temperature is raised to 60 ° C. while mixing with vacuum dehydration. Next, three rolls were simply passed through to create an offset printing ink. It was excellent in workability in the manufacturing process of ink, and the obtained ink was excellent in coloring power, transparency, and gloss. Table 2 shows the results compared with powder pigments and wet cakes of the same chemical structure for comparison.

color Coloring Transparency Polish Liquidity * 3 Handleability * 4 Powder Pigment * 1 Standard 100% Standard Standard Standard Standard Didisperse Pigments of the Invention (Example 2) Excellent 120% Transparency Excellent Good Good Wet Cake * 2 Excellent 120% Transparency Excellent Somewhat good bad

* 1 Pigment normally dried by the same dryer using the same wet cake and ground by the same mill (water content 1.5%)

* 2 Wet cake (78% water content) as it is

* 3 By parallel plate viscometer.

* 4 Mainly handleability

Example 3

Coupling of 4-methyl-5-croaniline-2-sulfonic acid soda with diazo component and β-okisinaptoic acid in a solvent was carried out in a solvent, followed by addition of strontium chloride, followed by filtration and washing with water. To obtain a wet cake (water content 76% by weight) of the monoazo lake pigment. It is dried in a continuous belt dryer. At this time, it adjusts and semi-drys so that it may become 15% of moisture content weight. This pigment is pulverized in a hammer grinder to obtain a dispersible pigment having an average particle diameter of 40 mu.

Next, using this heterodisperse pigment, the following formulation

50 parts of heterodisperse pigment of the present invention (as 100%)

Styrene-maric acid water-soluble resin varnish 200 parts

In accordance with this, a ball mill was used to prepare a Flexo printing ink according to a conventional method, to color the paper and to measure pigment properties.

For comparison, the results compared with powder pigments and wet cakes of the same chemical structure are shown in Table 3.

color Coloring Transparency Polish Liquidity * 3 Handleability * 4 Powder Pigment * 1 Standard 100% Standard Standard Standard Standard Didisperse Pigments of the Invention (Example 3) Vividness 110% equal Excellent Good Good Wet Cake * 2 Slightly sharper 110% Slightly transparent Excellent Good bad

* 1 Pigment normally dried by the same dryer using the same wet cake and ground by the same mill (water content 2%)

* 2 Wet cake (water content 76%) is used as it is

* 3 with type B viscometer.

* 4 Mainly handleability

Example 4

In Example 3, instead of strontium chloride, barium chloride was used, and all others were the same to obtain a wet cake (water content of 70% by weight) of monoazo pigment. This is dried in a box dryer. At this time, it adjusts and semi-drys so that it may become 10% of moisture content weight. This pigment is pulverized in a pinmeal to obtain a dispersible pigment having an average particle diameter of 80 mu. Using this di-disperse pigment, Flexo printing ink was prepared in the same manner as in Example 3 below, and it was colored on paper to measure pigment properties. For comparison, the results compared with powder pigments and wet cakes of the same chemical structure are shown in Table 4.

color Coloring Transparency Polish Liquidity * 3 Handleability * 4 Powder Pigment * 1 Standard 100% Standard Standard Standard Standard Didisperse Pigments of the Invention (Example 3) Vividness 105% equal Excellent Good Good Wet Cake * 2 Vividness 105% Slightly transparent equal equal equal

* 1 Pigment normally dried by the same dryer using the same wet cake and ground by the same mill (water content 2%)

* 2 Wet cake (70% water content) is used as it is

* 3 with type B viscometer.

* 4 Mainly handleability

Example 5

1-acetacetylamino-2-methylbenzene is coupled in the aqueous solvent with the coupling component and 3,3'-dichlorobenzidine as the Diazo component, followed by heating by addition of rosin and an activator. Subsequently, it is filtered and washed with water to obtain a wet cake (water content 75% by weight) of Disazo pigment. It is dried in a continuous belt dryer. At this time, it is adjusted to be 12% by weight of moisture content. This is pulverized in a pinmeal to obtain a dispersible pigment having an average particle diameter of 60 µ.

Next, using this heterodisperse pigment, the following formulation

Heterodisperse pigment of the present invention (as 100%) 40 parts

Styrenemaric Acid Water Soluble Resin Varnish 200

In accordance with this, a ball mill was used to prepare a Flexo printing ink according to a conventional method, to color the paper and to measure pigment properties. For comparison, the results compared with powder pigments and wet cakes of the same chemical structure are shown in Table 5.

color Coloring Transparency Polish Liquidity * 3 Handleability * 4 Powder Pigment * 1 Standard 100% Standard Standard Standard Standard Didisperse Pigments of the Invention (Example 3) Vividness 115% equal Excellent Good Good Wet Cake * 2 Vividness 115% Slightly transparent Excellent equal bad

* 1 Pigment normally dried by the same dryer using the same wet cake and ground by the same mill (water content 1.5%)

* 2 Wet cake (water content 75%) as it is

* 3 with type B viscometer.

* 4 Mainly handleability

The didisperse pigment of this invention has the following distinctive effects.

1) Appearance is powder, but there is no dust compared with normal powder (5% or less water content). In other words, dust is less scattered.

2) It is almost powdery, and is in a dispersible state close to a wet cake, and is excellent in handling in terms of use and logistics.

3) Wet cakes have many advantages compared to dry powders, but their transportation costs include transportation costs due to high water content and long-term changes of materials due to high or low temperatures in long distance transportation such as ship transportation. Entails. In other words, the wet cake was extremely limited in terms of transportation cost and stable quality in long distance import and export abroad. The didisperse pigment of the present invention has been found to have been found by the present inventors for the first time that its effect is extremely light and practically no problem.

4) According to the heterodisperse pigment of the present invention, it is possible to import and export from overseas, and it is extremely reasonable such as wide reduction of production cost and stabilization of quality.

5) The production of di-disperse pigments according to the present invention is extremely industrially advantageous because it does not require a special manufacturing apparatus and can be easily manufactured with existing equipment.

6) Since the production of the didisperse pigment of the present invention is easily produced by semi-drying the wet cake obtained in the pigment production step, it is possible to drastically improve the energy required for drying.

As mentioned above, the industrial and economical use value of the didisperse pigment of this invention is immeasurable.

Claims (12)

A disperse pigment, characterized in that the average particle diameter of substantially maintaining a flexible flocculation state is 1 to 100 µm, and the water content is 5 to 15% by weight. The method of claim 1, A disperse pigment, characterized in that the average particle diameter is 10μ-50μ. The method according to claim 1 or 2, A dispersible pigment, wherein the water content is 7 to 13% by weight. A method for producing a dispersible pigment having a mean particle size of 1 to 100 µm and a water content of 5 to 15% by weight, wherein the wet cake of the pigment is semi-dried. The method of claim 4, wherein A method for producing a dispersible pigment, characterized in that the average particle diameter is 10μ-50μ. The method according to claim 4 or 5, A method for producing a dispersible pigment, characterized in that the water content is 7 to 13% by weight. The method according to any one of claims 4 to 6, A process for producing a dispersible pigment, characterized by using a wet cake of a pigment having a water content of 65 to 85% by weight. The method of claim 7, wherein A method for producing a dispersible pigment, characterized in that a wet cake of a pigment having a water content of 70 to 80% by weight is used. A printing ink characterized by using a dispersible pigment having an average particle diameter of 1 to 100 µm and a water content of 5 to 15% by weight, which substantially maintain a flexible aggregated state. The method of claim 9, A printing ink having an average particle diameter of 10 µ-50 µ. The method according to claim 9 or 10, A printing ink having a water content of 7 to 13% by weight. Semi-drying the wet cake of the pigment to produce a dilute pigment having an average particle diameter of 1 to 100 µm and a water content of 5 to 15% by weight to substantially maintain a flexible agglomerated state. The manufacturing method of the printing ink characterized by mixing the varnish (resin) of the.