JPH07126687A - Detergent composition - Google Patents

Abstract

PURPOSE:To obtain a detergent composition, comprising a hydrocarbon having a specific flash point and viscosity, a polyethylene glycol monoalkyl ether, a nonionic surfactant and water, excellent in detergency for a printing ink and edge dust removability without causing the environmental disruption. CONSTITUTION:This detergent composition is obtained by blending (A) 50-90wt.% hydrocarbon having 75-160 deg.C flash point and 1.2-10cP viscosity at 40 deg.C (e.g. an aliphatic hydrocarbon) with (B) 5-20wt.% polyethylene glycol monoalkyl ether, expressed by the formula [R is a 6-10C alkyl; (n) is an integer of 1-31] (e.g. triethylene glycol mono-2-ethylhexyl ether), (C) 2-30wt.% nonionic surfactant (e.g. nonylphenol ethylene oxide 10mol adduct) and (D) 3-20wt.% water. The resultant detergent composition is noninflammable, excellent in material stability to rubbers or resins and good in detergency for a printing ink and edge dust removability and has high safety without causing environmental problems.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for cleaning newspaper printing devices, has excellent cleaning properties for printing ink and paper powder, does not contain environmentally destructive substances such as CFCs and chlorocarbons, and has a flash point. The present invention relates to a highly safe detergent composition.

[0002]

2. Description of the Related Art In the printing process of newspapers, it is necessary to periodically remove the printing ink and the paper dust adhered to the blanket and the guide roller, and conventionally an oily solvent such as CFC or hydrocarbon has been used.

[0003]

The above-mentioned oily solvents show good detergency for inks, but paper dust firmly sticking to the roller surface has strong hydrophilicity, so it can be completely removed with these oily solvents. No, you have to physically scrape it off with a brush or cloth. At this time, water is sprayed for the purpose of enhancing the removal effect. However, there are drawbacks such that the combined use of the oily solvent and water lowers the cleaning effect and causes paper breakage.

In recent years, the above-mentioned CFC compounds for cleaning have been certified as ozone-depleting substances, and their use is being restricted, and hydrocarbon solvents have a risk of ignition. The demand for is increasing. That is, the chlorofluorocarbon compound is nonflammable, quick-drying, and has major characteristics not found in other organic solvents, and therefore can be easily used in a large-scale printing apparatus. However, when switching to the hydrocarbon solvent that has been partially used in the past due to CFC regulations, it becomes flammable, which requires a major remodeling of the device for safety measures, which requires a large amount of cost. For this reason, there has been a demand for a cleaning agent which solves the above-mentioned social environmental problems, has high safety, and is excellent in detergency.

[0005]

In view of such circumstances, the inventors of the present invention have conducted diligent research, and as a result, have identified a specific hydrocarbon compound, a certain polyethylene glycol monoalkyl ether, a nonionic surfactant and water. The present invention has completed the present invention by discovering a detergent composition which, when blended in a sufficient amount, has no toxicity and is excellent in the cleaning property of oily printing ink, and is also excellent in the water-soluble paper dust removing property and does not cause paper breakage.

According to the present invention, a combination of a specific hydrocarbon, a suitable polyethylene glycol monoalkyl ether and a nonionic surfactant, and an appropriate amount of water are added to the composition to ignite the substance without depleting the ozone layer. It eliminates the risk of
It is possible to provide a detergent composition having an excellent paper dust removing property.

The present invention comprises 50 to 90% by weight of hydrocarbon, 5 to 20% by weight of polyethylene glycol monoalkyl ether represented by the general formula, 2 to 30% by weight of nonionic surfactant,
And a cleaning agent composition for newspaper ink, which comprises 3 to 20% by weight of water. RO- a _{(CH 2 CH 2 O) n} -H ··· (1) ( wherein R is an alkyl group having 6 to 10 carbon atoms, n represents 1 to 3
Indicates the integers of. ) Hydrocarbon alone is a flammable agent although it has a cleaning agent for ink, and has a problem in paper powder removability. For this reason, in order to make it a non-hazardous substance by the Fire Service Law and to improve the removal property, it is essential to mix water in the present invention, but a simple cleaning agent cannot be obtained by simply mixing hydrocarbon and water. In addition, the cleaning property also deteriorates. Therefore, it is necessary to use polyethylene glycol monoalkyl ether and a nonionic surfactant.

By using polyethylene glycol monoalkyl ether and a nonionic surfactant, a predetermined amount of water can be transparently dissolved in hydrocarbon to form a stable detergent having a low viscosity. Furthermore, the solubility of the oil-based ink is reduced by mixing water, but the action of polyethylene glycol monoalkyl ether enhances the dissolving power, and the action of the surfactant enhances the permeability and the dispersibility of the pigment. The cleaning power is improved, and the low viscosity facilitates spraying.

The hydrocarbon used in the present invention has a flash point of 75-1.
Viscosity at 60 ° C or 40 ° C is 1.2 to 10 cPs
Is to have. If the flash point is less than 75 ° C, there is a possibility of violating the organic law, and it becomes difficult to make it non-hazardous by the Fire Service Law. Further, when the flash point is 160 ° C. or higher, the detergency for ink is lowered, while the viscosity is increased, and it is necessary to refurbish an existing washer. The above-mentioned hydrocarbon may be any of an aliphatic type, a naphthene type and an aromatic type, but an aliphatic type and a naphthene type, which have little influence on rubbers and resins used in a printing apparatus, are preferable.

The polyethylene glycol monoalkyl ether is represented by the general formula (1). RO- a _{(CH 2 CH 2 O) n} -H ··· (1) ( wherein R is an alkyl group having 6 to 10 carbon atoms, n represents 1 to 3
Indicates the integers of. ) In the general formula (1), when R is an alkyl group having 5 or less carbon atoms, the material stability to the PS plate for newspapers is poor, and when an alkyl group having 11 or more carbon atoms is used, the appearance of the appearance is expected in the temperature range of 3 to 50 ° C. It is difficult to obtain a stable composition. Further, when n is 4 or more, the detergency for ink decreases.

Specific polyethylene glycol monoalkyl ethers include mono, di, triethylene glycol monohexyl ether, mono, di, triethylene glycol monooctyl ether, mono, di, triethylene glycol mono-2-ethylhexyl ether, mono,
Examples thereof include di, triethylene glycol monodecyl ether.

The amount of polyethylene glycol monoalkyl ether used is 5 to 20% by weight. If it is less than 5%, a predetermined amount of water cannot be dissolved in hydrocarbon in a stable state. On the other hand, if it is 20% or more, the cleaning property is deteriorated.

As the nonionic surfactant, HLB of 4 to
16 is preferable. When the HLB is 4 or less or 16 or more, it is difficult to obtain a composition having a stable appearance in the expected use temperature range of 3 to 50 ° C.

Specific nonionic surfactants include polyoxyalkylene alkyl phenyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene allyl phenyl ethers, polyoxyalkylene alkyl amines, polyoxyalkylene alkylol amides and the like.

The amount of the surfactant used is 2 to 30%.
If it is less than 2%, a predetermined amount of water cannot be dissolved in hydrocarbon in a stable state. On the other hand, when it is 30% or more, the viscosity is increased and the cleaning property is not improved. The water used in the present invention is 3 to 20%, preferably 5 to 10%.
If it is less than 3%, the composition cannot be made into a non-hazardous substance, while if it is more than 20%, not only the washability with respect to ink is deteriorated but also paper may be broken.

[0016]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
The compositions and test results of Examples 1 to 5 and Comparative Examples 1 to 7 are shown in Table-1.
It was shown to.

Test Method and Criteria 1. Appearance of detergent Visual judgment Liquid temperature Uniformly transparent in the range of 3 to 50 ° C ○ White turbidity separation ×

2. Related Laws Fire Defense Law Non-Dangerous Goods ○ Dangerous Goods × Organic Law Not Applicable ○ Applicable ×

3. Ink solubility Dissolve 1 ml of keyless black ink in 5 ml of cleaning agent and judge dissolution speed and pigment dispersibility. Very good ◎ Good ○ Somewhat bad ×

4. Material stability to rubber NBR test pieces (2 × 5 × 0.2 cm) were immersed in a cleaning agent for 7 days, and the average expansion coefficient was measured. Less than 0.5% Very good ◎ 0.5 to less than 1.0% Good ○ 1.0 to 1.5% Slightly inferior △

5. Material stability to resin Soak the developed PS plate for newspaper for 2 hours in a detergent,
The stability of the resin was visually evaluated. No resin dissolution is observed ◎ Slight resin dissolution is observed ○ Resin dissolution is considerably observed ×

6. After running out of the cleaning agent on the newspaper, the paper was pulled with both hands. Not out of paper ○ Out of paper ×

7. Viscosity of solvent: 25 ° C., cPs 5 cPs or less ◎ 5 to less than 10 cPs ○ 10 cPs or more Δ

The compositions and evaluation results of Examples 1 to 5 and Comparative Examples 1 to 9 are shown in Tables 1 and 2.

* 1: Exxon Chemical: Exol D-
40 * 2: Nippon Petrochemical: Naphthesol L, Fuji Kosan:
High Solvent 200 * 3: Naphthesol H, High Solvent 240 * 4: High Solvent 280 * 5: Diethylene glycol monobutyl ether * 6: Diethylene glycol monohexyl ether * 7: Triethylene glycol mono-2-ethylhexyl ether * 8: Diethylene glycol monooctyl ether * 9: Nonylphenol ethylene oxide 10 mol adduct,
HLB 13.3 * 10: Nonylphenol 18 mol ethylene oxide adduct, HLB 15.7 * 11: Octyl alcohol ethylene oxide 2 mol adduct, HLB 8.1 * 12: Lauryl alcohol ethylene oxide 10 mol adduct, HLB 14. 1 * 13: oleyl alcohol ethylene oxide 2 mol adduct, HLB 4.9 * 14: oleyl alcohol ethylene oxide 9 mol adduct, HLB 11.5 * 15: sorbitan sesquioleate
HLB 3.7 * 16: Ethylene oxide (160 mol) Propylene oxide (3
0 mol) block copolymer

[0026]

[0027]

The cleaning agent of the present invention has the following excellent characteristics and can be used as a substitute for conventional cleaning solvents such as CFCs and hydrocarbons. That is, (1) the newspaper ink is excellent in detergency and pigment dispersibility. (2) It is non-flammable, does not meet the organic rules, and is highly safe. (3) Does not contain CFCs or chlorocarbons and does not cause environmental problems. (4) The material is highly stable against rubber and resin, and it does not run out of paper. (5) The existing washing machine set in the printing device can be used.

Claims (1)

[Claims] 1. A hydrocarbon 50 to 9 having a flash point of 75 to 160 ° C. or a viscosity at 40 ° C. of 1.2 to 10 cPs.
A cleaning composition for a printing ink comprising 0% by weight, 5 to 20% by weight of a polyethylene glycol monoalkyl ether represented by the general formula (1), 2 to 30% by weight of a nonionic surfactant, and 3 to 20% by weight of water. RO- a _{(CH 2 CH 2 O) n} -H ··· (1) ( wherein R is an alkyl group having 6 to 10 carbon atoms, n represents 1 to 3
Indicates the integers of. )