JPH0959695A - Detergent for printing ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a detergent excellent in both the ability to clean a printing ink and the ability to remove water-soluble dust generated from paper. SOLUTION: This detergent comprises a water-in-oil type (W/0 type) emulsion produced by adding 30-300 pts.wt. water to 100 pts.wt. organic component consisting of 100 pts.wt. solvent component substantially comprising one or more solvents selected from hydrocarbon solvents and terpene compounds and 1-20 pts.wt. surfactant component substantially comprising a nonionic surfactant.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cleaning agent for printing ink. More specifically, the present invention relates to a cleaning agent for removing ink, paper dust, and the like adhering to rollers and blankets of an offset printing machine, a method for producing the cleaning agent, and a method for using the cleaning agent.

[0002]

2. Description of the Related Art Conventionally, petroleum such as gasoline and kerosene has been widely used for cleaning rollers of an offset printing machine. However, there is a great risk of fire, and
Emulsion type cleaning agents mainly composed of kerosene and water have been proposed due to insufficient removal of paper dust (see JP-A-7-34097, etc.).

In addition, cleaning of stains such as printing ink and paper dust is generally carried out after the above cleaning agent is dropped on the portion to be cleaned.
It was done by wiping with a used textile product (waste).

[0004]

The known emulsion detergent contains an ionic surfactant as an essential component,
It tends to be an oil-in-water (o / w) emulsion, and the cleaning properties of the printing ink tend to be insufficient. In the o / w type emulsion, the ink first comes into contact with water, but as a result of the poor solubility of the ink in water, the detergency of the ink is poor.

Further, the content of water is as small as 3 to 20%,
In addition to being economically disadvantageous, careful handling was required from the perspective of fire risk.

Further, the above-mentioned method for cleaning the printing ink / paper dust stain requires repeated wiping with a waste cloth.

In view of the above, it is an object of the present invention to provide a cleaning agent for printing ink which is excellent in cleaning ability of printing ink and removal of water-soluble paper powder generated from paper, and a method for producing the same.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to solve the above-mentioned problems, and as a result, a cleaning agent for printing ink having the following constitution, a method for producing the same, and further the cleaning agent I thought about how to use it.

(1) The cleaning agent for a printing ink of the present invention comprises 100 parts by weight of a solvent component (hereinafter, referred to as "solvent", which is substantially composed of one or more selected from hydrocarbon solvents and terpene compounds. Abbreviated as "part"), and 30 to 300 parts of water are added to 100 parts of an organic component consisting of 1 to 20 parts of a surfactant component which is substantially composed of a nonionic surfactant. It is characterized in that it is a water drop type (w / o type) emulsion.

(2) In the method for producing a cleaning agent for a printing ink according to the present invention, in producing the detergent of the above (1), an organic component is selected from stirring blades, ultrasonic waves, and circulating flow. One or two or more of them are used while stirring, and water is added to carry out a w / o type emulsion.

(3) The method of using the cleaning agent for printing ink according to the present invention is, for example, a roller / blanket of a printing machine in which the cleaning agent for printing ink of the above (1) is contaminated with contaminants such as ink and paper powder. It is characterized in that the contaminant is released from the surface of the roller / blanket or the like, and the emulsion containing the contaminant is wiped off with a cloth product made of hydrophilic / lipophilic fiber.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

(1) The solvent component used in the present invention is substantially composed of one or more selected from hydrocarbon solvents and terpene compounds. These solvents are
This is because it has excellent solubility in printing ink. here,
The term "substantially" means that other hydrocarbon solvents such as halogenated hydrocarbons and alcohols are used as long as the "hydrocarbon-based solvent and terpene-based compound" do not impair the above-mentioned reasoning characteristics. It means that the combined use of a system, an ether system, an acid / ester system, etc.

The above-mentioned hydrocarbon solvent usually has a boiling point of 1
The temperature range from 0 to 300 ° C is used, and preferably from 120 to 300 ° C.
Use one at 250 ° C.

Further, from the viewpoint of handleability, the flash point 20 to
Those in the range of 160 ° C. are preferred. This is because if the temperature is 20 ° C. or lower, the risk of ignition increases. This is because at 160 ° C. or higher, the viscosity increases greatly and the cleaning property with respect to ink is poor.

As the component of the hydrocarbon solvent, aromatic hydrocarbons such as xylene can be used in addition to aliphatic hydrocarbons and alicyclic hydrocarbons. Specifically, the following can be exemplified. The boiling point and flash point in parentheses (excluding light oil)
Is quoted from page 745 of “Revised 3rd Edition Chemical Handbook”, published by Maruzen Co., Ltd., and the flash point of diesel fuel is quoted from “JIS k 2204”.

Industrial Gasoline No. 4 (Mineral Spirit)
(Boiling point 140-205 ° C, flash point> 30 ° C), industrial gasoline No. 5 (cleaning solvent) (boiling point 150-
210 ℃, flash point> 38 ℃, kerosene (boiling point 185-28)
5 ° C, flash point> 30 ° C, light oil (flash point> 50 ° C),
etc.

The terpene compound has 5 carbon atoms.
n (n> 1), a substance which is considered to be derived from a precursor composed of isoprene or isopentene from a biosynthetic point of view, and refers to a substance existing as a hydrocarbon, alcohol, ketone or the like. Specific examples thereof include terpineol, terpinene (C ₁₀ H ₁₆ ), terpinolene (C ₁₀ H ₁₆ ), dipentene (limonene) (C ₁₀ H ₁₆ ), and the like, which are commercially available as a mixture of turpentine oil and gum turpentine oil. Including things. The terpene compound has excellent solubility in the ink, and it is preferable to add it as much as possible.

(2) The surfactant component is substantially composed of a nonionic surfactant. This is because the nonionic surfactant is superior to the ionic surfactant in solubility in water at low temperatures, is less susceptible to pH, and exhibits a stable emulsifying action.
The amount of the nonionic surfactant blended is 1 to 20 parts, preferably 5 to 15 parts, per 100 parts of the solvent component.
This is because if it is less than 1 part, the stability of the emulsion will be poor, and if it is more than 20 parts, not only is it economically disadvantageous, but also problems such as gelation tend to occur.

Here, the term "substantially" means that a combination of other ionic surfactants is used within a range that does not impair the above-mentioned reasonable characteristics of the "nonionic surfactant" selected in the present invention. Means to allow.

Examples of the nonionic surfactant include polyoxyalkylene alkyl phenyl ether, polyoxyalkylene alkyl ether, polyoxyalkylene fatty acid ester, sorbitan fatty acid ester, polyoxyalkylene sorbitan fatty acid ester and the like. Examples of the oxide forming the oxyalkylene include ethylene oxide (EO) and propylene oxide, and the number of added moles (average unless otherwise specified) is usually 2 to 50.

(3) The cleaning agent of the present invention comprises the above solvent component 10
Organic component 1 consisting of 0 part and 1 to 20 parts of surfactant component
30 to 300 parts, preferably 60 to 2 parts for 00 parts
This is a w / o type emulsion obtained by adding 60 parts of water.

When the amount of water added is 30 parts or less, the effect of removing (washing) paper dust is small, and when it is more than 300 parts, the emulsion stability and the ink washability are significantly deteriorated. is there.

The reason why the w / o type emulsion is used is that it has excellent cleaning properties against ink stains. That is,
This is because when the continuous phase is oil in the w / o type emulsion and the cleaning agent is dropped on the ink stain, the oil first comes into contact with the oil-soluble ink and the ink is captured by the oil phase.

(4) In the w / o type emulsion which is the detergent of the present invention, an organic component generally composed of a hydrocarbon solvent / terpene compound and a nonionic surfactant is mixed with a stirring blade, ultrasonic waves and a circulating flow. It can be easily prepared by adding one or two or more selected from the above while stirring and adding water to form a w / o type emulsion. In addition,
A small amount of the emulsion can be dropped into water to easily distinguish it from the o / w type when it easily diffuses and from the w / o type when it does not diffuse easily.

For concrete stirring, the stirring rod 13 having the propeller 11 is rotated (FIG. 1), the ultrasonic transmitter 15 is inserted into the liquid (FIG. 2), or ultrasonic waves are generated by attaching it to the outer wall of the stirring layer 17. Can be generated (FIG. 3), the liquid L can be circulated and agitated by the pump 19 (FIG. 4), and the liquid L can be circulated and agitated by the submerged pump 20 (FIG. 5).

(5) The method of using the cleaning liquid of the present invention (cleaning method) is, for example, that the cleaning liquid is put in the pot 21 and the like, and the printing ink roller 23 is contaminated with contaminants such as ink and paper dust.
It is desirable that the contaminants be released from the surface of the printing ink roller or the blanket and then wiped off with a cloth product 25 made of hydrophilic / lipophilic fibers (FIG. 6). Since the cloth product includes the hydrophilic part and the lipophilic part and simultaneously and well captures the ink stain and the paper dust stain, the time taken to wipe it off cleanly becomes short. Here, the cloth product may be any kind of non-woven fabric, felt or woven fabric, but non-woven fabric is preferable from the viewpoint of economy and easy availability of the material stably.

As the hydrophilic / lipophilic fiber, the mixing ratio of hydrophilic fiber / lipophilic fiber is preferably in the range of 1/9 to 9/1. Examples of the hydrophilic fibers include pulp, viscose rayon, cellulose fibers such as cotton, hydrophilic acrylic fibers, hydrophilic nylon and the like. Examples of lipophilic fibers include polypropylene fibers and polyester fibers.

[0029]

The action and effect of the present invention is as follows:
As a result of being a w / o type emulsion, the cleaning properties of printing ink are excellent, and as a result of containing a larger amount of water than before, the removability of water-soluble paper powder is also excellent. Further, since the cleaning liquid contains water, safety against fire is improved and handleability is also improved.

That is, since the water-insoluble resin contained in the ink precipitates at the interface between water and oil, the concentration of the water-insoluble resin contained in the solvent component in the emulsion is lower than that in the case where the solvent component alone is used, and the repetitive process is repeated. It is possible to reduce the number of washings, and its industrial significance is great.

Further, the cleaning agent for printing ink of the present invention is used and dropped on a printing ink roller or blanket contaminated with a contaminant such as ink or paper powder to release the contaminant from the surface of the printing ink roller or blanket. , When wiped off with a cloth product consisting of hydrophilic / lipophilic fibers, it takes less time than when wiped off with a normal hydrophilic cloth such as cotton or only a lipophilic cloth product such as polypropylene fiber. .

[0032]

EXAMPLES Examples performed to confirm the effects of the present invention will be described below.

<Example 1> Petroleum solvent having a boiling point of 161 to 200 ° C (boiling point of 161 to 200 ° C, flash point of 30 to 60 ° C;
8 parts of polyoxyethylene oleyl ether (the number of moles of EO added = 5) was added to 100 parts of the aromatic component (15%). While stirring 100 parts of this organic component with a stirring blade (propeller type, rotation speed: 500 rpm, time 120
Min) and 150 parts of deionized water (hereinafter simply "water"). When a small amount of the detergent thus prepared was added to water, it was confirmed that it had a poor diffusion solubility, was a w / o emulsion, and had excellent emulsion stability.

The cleaning agent thus prepared is dropped on a roll of an offset printing machine to which ink and paper powder are adhered, and wiped with a nonwoven fabric made of polyester fiber / pulp 1/1 at the bottom of the roll to clean the roll. As a result,
It was confirmed that the contaminants could be removed by washing for 5 minutes, and the ink and paper dust were also excellently removed.

Similarly, when wiped off with a propylene woven cloth, it cannot be wiped off because it does not absorb the water in the emulsion, whereas in the case of cotton, it can be wiped out in about 5 minutes with dry cotton. But it was not possible with damp cotton.

Example 2 To 100 parts of limonene which is a terpene compound, 5 parts of polyoxyethylene nonylphenol ether (the number of moles of EO addition = 4) and 4 parts of sorbitan monooleate were added. To 100 parts of the organic component thus obtained, 100 parts of water is added with stirring in the same manner as in Example 1. Similarly, it was confirmed that the obtained emulsion was a w / o type emulsion, and the emulsion stability was excellent.

The cleaning agent thus prepared is dropped on a roll of an offset printing machine on which ink and paper powder are adhered, and the roll is cleaned by wiping it off with a nonwoven fabric made of polyester fiber / cotton 1/1 at the lower part of the roll. As a result, 5
It was confirmed that the contaminants could be removed by washing for a minute, and the ink and paper dust removal properties were also excellent.

<Example 3> Petroleum solvent (boiling point 160 to 1)
75 ° C, flash point 30-60 ° C; aromatic component 75%) 10
0 parts to 7 parts sorbitan monooleate,
An organic component was prepared by adding and mixing 7 parts of polyoxyethylene nonyl phenyl ether (EO addition mole number = 10). To 100 parts of this organic component, 80 parts of water is added and mixed with stirring in the same manner as in Example 1. The detergent thus prepared was confirmed to be a w / o type emulsion, and the emulsion stability was also excellent.

The above cleaning agent was dropped on a roll of an offset printing machine on which ink and paper powder had adhered, and the roll was washed by wiping with a non-woven fabric composed of polypropylene fiber / cotton 1/1 under the roll. It was confirmed that the contaminants could be removed in 5 minutes, and the ink and paper dust removal properties were excellent. <Example 4> To 100 parts of xylene (boiling point 137 to 142 ° C, flash point 23 ° C), 7 parts of sorbitan monooleate and 7 parts of polyoxyethylene nonylphenyl ether (EO addition mole number = 10) were added and mixed. Then, an organic component was prepared. To 100 parts of this organic component, Example 1
In the same manner as above, 80 parts of water is added and mixed while stirring. The detergent thus prepared was confirmed to be a w / o type emulsion, and the emulsion stability was also excellent.

This cleaning agent was dropped on a roll of an offset printing machine to which ink and paper powder had adhered, and the lower part of the roll was wiped with a nonwoven fabric composed of polypropylene fiber / cotton 1/1 to clean the roll. It was confirmed that the contaminants could be removed in 5 minutes, and the ink and paper dust removal properties were excellent.

<Example 5> 80 parts of xylene / 2 of limonene
0 parts to 7 parts sorbitan monooleate,
An organic component was prepared by adding and mixing 7 parts of polyoxyethylene nonyl phenyl ether (EO addition mole number = 10). To 100 parts of this organic component, 80 parts of water is added with stirring as in Example 1. The detergent thus prepared was confirmed to be a w / o type emulsion, and the emulsion stability was also excellent.

When the detergency was tested in the same manner as in Example 1, the contaminants could be removed in 5 minutes.
It was excellent in removing paper dust.

<Example 6> Instead of stirring by the stirring blade of Example 1, stirring was performed for 120 minutes with a circulating flow (flow rate: 0.5 L / min, in-tank liquid amount: 20 L). Similarly w /
An o-type emulsion could be prepared, and the ability to remove ink and paper dust was excellent.

<Embodiment 7> Instead of stirring by the stirring blade of Embodiment 1, an ultrasonic oscillator (150 W, 20 W
Ultrasonic wave (maximum output 2)
/ 3) was oscillated and stirred for 60 minutes. Similarly w /
An o-type emulsion could be prepared, and the ability to remove ink and paper dust was excellent.

Comparative Example 1 Petroleum solvent (boiling point 161-2)
00 ° C, flash point 30-60 ° C; aromatic component 15%) 10
With respect to 0 part, polyoxyethylene (number of moles of EO added =
5) An organic component was prepared by adding 8 parts of olein ether. To 100 parts of this organic component was added 250 parts of water. It was confirmed that the detergent thus prepared had a good diffusion solubility when added to water in a small amount and was an o / w type emulsion.

When this detergent was used to test the cleaning property in the same manner as in Example 1, it took 15 minutes or more to remove the ink adhering to the roll, and the cleaning property was poor. It is presumed that it is an o / w emulsion.

[Brief description of drawings]

FIG. 1 is a schematic view showing one aspect of stirring in preparing the cleaning agent of the present invention.

FIG. 2 is a schematic view showing another embodiment of stirring as well.

FIG. 3 is a schematic view showing still another mode of stirring.

FIG. 4 is a schematic view showing still another mode of stirring.

FIG. 5 is a schematic view showing still another mode of stirring.

FIG. 6 is a schematic view showing an example of a cleaning method using the cleaning agent of the present invention.

[Explanation of symbols]

 11 Stirring blade 15 Ultrasonic transmitter

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication C11D 3:43) (72) Inventor Osamu Nakagawa 2 39 Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Stock Nikken Chemical Research Institute Co., Ltd. (72) Inventor Tokuichi Kamata 2-39, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Nikko Chemical Research Center Co., Ltd. (72) Inventor Masaaki Muto Nishi-Kasugai-gun Nishi, Aichi Prefecture 2-39, Asahimachi, Bibishima-cho Nikken Chemical Research Institute Co., Ltd.

Claims (4)

[Claims] 1. 100 parts by weight of a solvent component (hereinafter abbreviated as "part") substantially composed of one or more selected from hydrocarbon solvents and terpene compounds, and a nonionic interface. 30 to 300 parts of water is added to 100 parts of an organic component consisting of 1 to 20 parts of a surfactant component substantially composed of an activator to give a water-in-oil type (w / o).
(Type) A cleaning agent for printing ink, which is an emulsion. 2. The printing according to claim 1, wherein one kind or two or more kinds are selected and used from alkylene oxide type and polyhydric alcohol fatty acid ester type as the nonionic surfactant. Cleaning agent for ink. 3. When manufacturing the cleaning agent for printing ink according to claim 1, the organic component is one or two selected from a stirring blade, an ultrasonic wave and a circulating flow. A method for producing a cleaning agent for printing ink, which comprises adding water to carry out emulsification of w / o type while stirring using the above. 4. The cleaning agent for printing ink according to claim 1 is dropped onto a roller blanket or the like of a printing machine that is contaminated with contaminants such as ink and paper powder to remove the contaminants. A method of using a cleaning agent for printing ink, which comprises releasing an emulsion containing contaminants from a surface of a roller / blanket or the like with a cloth product made of hydrophilic / lipophilic fibers.