JP2009062432A - Solubilized type detergent composition for printing ink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solubilized type detergent composition, which has excellent printing ink washability, solves a social environmental problem and a labor hygiene problem, has a nonflammable property for improving safety and ease of handling, has solvent resistance for rubber, resin and the like, and can be easily washed with water, for printing ink. <P>SOLUTION: The solubilized type detergent composition contains 40-90 wt.% nonionic surfactant represented by the following general formula (1), 1-15 wt.% vegetable oil, and water. In the formula (1): R-O-(AO)n-H, R represents an 8-20C hydrocarbon group, (AO) represents a 2-4C oxyalkylene group, and n shows an average addition molar number of alkylene oxide and ranges from 4 to 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solubilizing printing ink cleaning composition, and more particularly to a solubilizing printing ink that is suitable for cleaning printing ink adhered to a roller of an offset printing machine and can be easily rinsed with water. The present invention relates to a cleaning composition.

  Ink and paper dust adhering to rollers and blankets of an offset printing machine need to be washed and removed during printing color change and regular maintenance.

  Conventionally, cleaning compositions for offset printing machines include chlorinated solvents such as trichlorethylene, petroleum hydrocarbons typified by gasoline and kerosene, alcohols typified by isopropyl alcohol, and others. Organic solvents such as terpene hydrocarbons, glycol ethers, and butyl acetate are used. Also, water-based detergents composed of alcohols, glycerin, water, etc., alkali-based detergents composed of organic amines, surfactants, water, etc., petroleum hydrocarbons, nonionic surfactants, water, etc. An emulsion-based aqueous detergent composed of the following is also used. Furthermore, some detergents comprising nonionic surfactants and vegetable oils are also used (see, for example, Patent Documents 1 to 7).

To remove the ink adhering to the roller of the offset printing machine, apply the cleaning agent directly while dripping the cleaning agent while rotating the roller, and remove the cleaning agent in a state where the ink on the roller and the cleaning agent are mixed together. A blade-like plate was scraped off and removed, and a cleaning agent was dropped several times to wipe off the ink remaining on the roller surface, or a method of immersing the cleaning agent in a waste cloth and wiping by hand. . In addition, the cleaned roller was rinsed with a cleaning agent alone or a cleaning agent diluted with a solvent.
JP-A-8-283629 JP-A-8-283790 JP-A-9-59695 JP 2003-64284 A JP 2005-187673 A Japanese Patent Laid-Open No. 2005-23196 JP 2005-75926 A

  However, in recent years, since various environmental problems have occurred, regulations on various kinds of chemical substances are being strengthened, and regulations on volatile organic compounds are also being strengthened. Emissions are greatly suppressed, measures to strengthen this regulation are required, and printing-related facilities are no exception.

  Most of the above cleaning compositions used for cleaning offset printing presses correspond to regulated volatile organic compounds, and also have flammability and some are equivalent to ozone depleting substances, It is predicted that its use and handling will become difficult in the future.

  On the other hand, even water-based cleaning agents containing an organic solvent such as alcohol are not preferable in terms of environmental safety, and organic alkaline water-based cleaning agents are not flammable but are not preferable in terms of occupational health because they are alkaline. . In addition, emulsion-based detergents must contain a large amount of organic solvent components in order to exert their cleaning performance, and some of them are classified as flammable substances (flammable liquids) designated by the Fire Service Act. A great deal of consideration is required. Moreover, since the detergent which consists only of surfactant and vegetable oil has flammability, sufficient consideration is still needed for handling.

  In addition, since conventional cleaning agents contain a large amount of organic solvent, they may swell, dissolve, and shrink rubber rollers and resin parts of offset printing presses, which hinders continuous operation of printing presses. is there.

  As for rinsing, it is necessary to pay attention to flammability in consideration of environmental problems and occupational health, because organic solvents and cleaning solutions containing a lot of solvents are used.

  In view of the above problems, the present invention is excellent in printing ink cleaning properties, solves the above-mentioned social environmental problems and occupational health problems, is nonflammable, improves safety, is easy to handle, rubber, An object of the present invention is to provide a solubilized printing ink cleaning composition that is excellent in solvent resistance such as resin and can be easily rinsed with water.

  As a result of intensive studies to solve the above problems, the present inventors have obtained a compatibility with a nonionic surfactant as a main component as a cleaning ink composition for printing ink such as an offset printing machine, and includes vegetable oil. This can improve the solubility of the printing ink and improve the cleaning performance of the ink, and also solve the problem of flammability by blending water, and rinse the cleaning agent with water easily after cleaning. Found that is possible.

  That is, the present invention based on the above knowledge is characterized by comprising 40 to 90% by weight of a nonionic surfactant represented by the following general formula (1), 1 to 15% by weight of vegetable oil, and water. It is a solubilized type cleaning composition for printing ink that can be easily rinsed with water. The solubilized type means that the appearance of the solution is not clouded or separated, and is mutually compatible.

R-O- (AO) n-H (1)
(In the formula, R represents a hydrocarbon group having 8 to 20 carbon atoms, and (AO) represents an oxyalkylene group having 2 to 4 carbon atoms. N represents the average number of added moles of alkylene oxide, and is 4 to 20. )

  According to the solubilized printing ink cleaning composition of the present invention, by adding vegetable oil to the nonionic surfactant, the vegetable oil component increases the solubility in the printing ink and exhibits excellent cleaning performance. In addition, it is non-flammable and improves safety by blending water, and it is water-soluble, uniform and stable without compatibilizing and emulsifying and without causing solution turbidity or separation of components. The cleaning composition.

  Hereinafter, embodiments of the present invention will be described.

  The detergent composition for a solubilized printing ink of the present invention is a detergent composition comprising a nonionic surfactant comprising an alkylene oxide compound represented by the following general formula (1), a vegetable oil, and water. It is a thing.

R-O- (AO) n-H (1)
In the formula (1), R is a hydrocarbon group having 8 to 20 carbon atoms, and more preferably a hydrocarbon group having 8 to 11 carbon atoms. (AO) represents an oxyalkylene group having 2 to 4 carbon atoms. n shows the average addition mole number of alkylene oxide, and is 4-20.

  In the above formula (1), examples of R include hydrocarbon groups such as an alkyl group having 8 to 20 carbon atoms, an alkenyl group, an aryl group, a cycloalkyl group, and a cycloalkenyl group. Among them, those having 8 to 11 carbon atoms are preferable.

  Usually, R is a hydrocarbon group derived from an alcohol, which may be derived from a natural alcohol, a synthetic alcohol, a linear type or a branched type, or a primary alcohol. Secondary alcohol may be used.

  Examples of the natural alcohol include octyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol and the like.

  As a synthetic alcohol, in a linear form, for example, n-octanol, n-nonanol, n-decanol, n-undecanol, n-dodecanol, n-tridecanol, n-tetradecanol, n-pentadecanol, n- Examples include hexadecanol, n-heptadecanol, and n-octadecanol. In the branched type, for example, as oxo alcohols, there are isooctanol, isononanol, isodecanol, isoundecanol, isododecanol, isotridecanol, isotetradecanol, isopentadecanol, isoheptadecanol, and the like. Examples of Gerve alcohol include 2-ethyl-hexanol, 2-propyl-heptanol and the like, and these may be single or plural isomers. In addition, various alcohols can be mixed and used.

  Moreover, Neodol series made by Shell Chemicals and EXXAL series made by Exxon Chemicals are suitable as commercially mixed alcohols.

  These alcohols may be used in combination of two or more.

  In the formula (1), (AO) represents an oxyalkylene group having 2 to 4 carbon atoms, and the alkylene oxides are ethylene oxide, propylene oxide, and butylene oxide.

  The addition form of the alkylene oxide may be a block adduct or a random adduct, and may optionally have both a block addition portion and a random addition portion.

  The average added mole number n of alkylene oxide is 4 to 20, and when n exceeds 20, the detergency decreases, and when n is less than 4, the solubilizing power of water and vegetable oil decreases. .

  The solubilized printing ink cleaning composition of the present invention may contain the nonionic surfactant alone or a plurality of them.

  Specific examples of the vegetable oil used in the present invention include soybean oil, rapeseed oil, cottonseed oil, corn oil, castor oil, sunflower oil, safflower oil, sesame oil, olive oil, palm oil, coconut oil, and palm kernel oil. . These vegetable oils may be used alone or in combination.

  Among these, soybean oil, rapeseed oil, and coconut oil are preferable because of their excellent detergency for printing ink.

  The detergent composition for the solubilized printing ink of the present invention is a detergent composition containing 40 to 90% by weight of the nonionic surfactant, 1 to 15% by weight of vegetable oil, and water, thereby offsetting. The ink on the printing press can be cleaned and removed effectively and safely.

  If the blending amount of the nonionic surfactant is less than 40% by weight, sufficient cleaning performance cannot be obtained, and it becomes difficult to solubilize the vegetable oil, so that the composition containing water becomes cloudy and the components are separated. If it exceeds 90% by weight, flammability may be exhibited, which is not preferable for safety.

  Further, if the blending amount of the vegetable oil is less than 1% by weight, the solubility of the printing ink becomes low and sufficient cleaning performance cannot be obtained, and if it exceeds 15% by weight, flammability is exhibited, NBR used in a printing machine, There is a possibility that adverse effects such as swelling or dissolution of a rubber material such as urethane rubber or resin may occur.

  The solubilized printing ink cleaning composition of the present invention is a known nonionic surfactant other than the above nonionic surfactant, anionic surfactant, amphoteric surfactant, fluorine-based, if necessary. A surfactant, a silicon surfactant, polyethylene glycol, propylene glycol, or the like may be added.

  For example, nonionic surfactants include polyoxyalkylene polystyryl phenyl ether, polyoxyethylene polyoxypropylene block copolymer, polyoxyalkylene glyceryl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester , Polyoxyethylene glyceryl fatty acid ester, alkyl glucoside and the like.

  Examples of the anionic surfactant include fatty acid soap, rosin acid soap, alkyl sulfonate, alkyl aryl sulfonate, alkyl sulfosuccinate, poxyalkylene alkyl sulfate, and polyoxyalkylene aryl sulfate. .

  The solubilized printing ink cleaning composition of the present invention can be used for cleaning printing ink as it is as a stock solution, but can also be diluted to an arbitrary concentration with water.

  The cleaning composition diluted with water can also be used for rinsing ink remaining on the roller after cleaning. Furthermore, by rinsing with water, the cleaning composition adhering to the roller or the like can be washed off.

  The production of the solubilized printing ink cleaning composition of the present invention is not particularly limited, and a known production method can be applied. For example, a nonionic surfactant, vegetable oil and water may be mixed according to a conventional method.

  The method of using the solubilized printing ink cleaning composition of the present invention can be used in the same manner as a conventional ink cleaning composition, and is particularly suitable for a waterless offset printing press.

  Examples of the present invention are shown below, but the present invention is not limited by these examples.

  According to the formulation (weight%) of each Example and Comparative Example described in Tables 1 to 3, a nonionic surfactant, vegetable oil, and water (ion-exchanged water) are mixed, and a cleaning composition for each printing ink. Was prepared. About each obtained washing | cleaning-liquid composition, compatibility (soluble), washing | cleaning performance (ink washing | cleaning property), safety | security (flammability), and swelling property (solvent resistance) were evaluated with the following test method and criteria. Table 1 shows the results of Examples 1 to 15, Table 2 shows the results of Examples 16 to 27, and Table 3 shows the results of Comparative Examples 1 to 14.

The vegetable oils used are as follows.
・ Soybean oil: Showa Sangyo Co., Ltd., soybean white squeezed oil, rapeseed oil: Nisshin Oil Co., Ltd., rapeseed white squeezed oil, coconut oil: Fuji Oil Co., Ltd.

[Compatibility]
After mixing and mixing a nonionic surfactant, vegetable oil, and water, it was left to stand at room temperature for 1 hour, the external appearance of the mixed solution was observed visually, and the following reference | standard evaluated.
○: Solubilized uniformly.
X: The solution is cloudy or the components are separated.

[Cleaning performance]
An ink for offset printing is attached to a nitrile rubber (NBR) vulcanized rubber test piece (25 mm × 70 mm × 2 mm), and then left to stand for 2 minutes to dry. After soaking each cleaning composition in the waste, the ink adhering to the NBR was wiped off, and the cleaning performance was evaluated by the number of times the ink was completely wiped off.
◎: 1 to 15 times ○: 16 to 30 times Δ: 31 to 50 times ×: Ink cannot be removed even after wiping 51 times or more.

[safety]
The flammability of each cleaning composition was confirmed. In addition, those with a flash point of less than 80 ° C. were measured by a tag sealing type or a seta sealing type according to the viscosity, and those having a flash point of 80 ° C. or more were measured by a Cleveland open type.
○: No flash point is developed.
X: Flash point is developed.

[Swellability]
Each cleaning composition was placed in a 100 ml screw tube and kept at 40 ° C., and an NBR vulcanized rubber test piece (25 mm × 70 mm × 2 mm) was immersed for 24 hours. The weight change and volume change after immersion were measured. Compared to before immersion, the evaluation was made according to the following criteria.
◎: No change-Change rate of both weight and volume is less than 0.5% ○: Change rate of both weight and volume is less than 0.5-1% △: Change rate of weight or volume is less than 1-5% ×: Weight Or the volume change rate is 5% or more

In Tables 1 to 3, (1) Regarding the notation of AO, (EO) is ethylene oxide, (PO) is propylene oxide, (BO) is butylene oxide, and the attached numerical values indicate the number of moles added by polymerization. _{(2) - (A 1 O} ) x- (A 2 O) y- , the block copolymer of alkylene oxide species _{A 1} O and _{A 2} O (added) indicates the body, a n = x + y. Further, the addition order indicates the order of A ₁ O and A ₂ O. _{(3) - (A 1 O} ) x / (A 2 O) y- represents a random copolymer (additional) body alkylene oxide species _{A 1} O and _{A 2} O.

  The cleaning composition for printing inks of the present invention can be used for cleaning and removing various printing inks, and is particularly suitable for cleaning inks of offset printing machines.

Claims (1)

A detergent composition for a solubilized printing ink comprising 40 to 90% by weight of a nonionic surfactant represented by the following general formula (1), 1 to 15% by weight of vegetable oil, and water object.
R-O- (AO) n-H (1)
(In the formula, R represents a hydrocarbon group having 8 to 20 carbon atoms, and (AO) represents an oxyalkylene group having 2 to 4 carbon atoms. N represents the average number of added moles of alkylene oxide, and is 4 to 20. )