JPH0959682A - Detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a printing ink by using a non-chlorinated detergent composition free from the problems as to flammability, safety to the human body, and odor. SOLUTION: An ink is washed away by using a composition comprising a mixture of a propylene glycol ether represented by the formula, R1 O(C3 H6 O)n R2 (wherein R1 and R2 may be the same or different and are each H or an alkyl represented by the formula, Cm H2m+1 , except for the case where both of them are H at the same time; and (n) is an integer of 1 to 4), a propylene glycol ether acetate represented by the formula, CH3 COO(C3 H6 O)n R3 (wherein R3 is an alkyl or phenyl; and (n) is an integer of 1 to 4) and water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition used for removing printing inks. More specifically, it is possible to print with a screen plate on which printing has been completed or the quality of which has deteriorated due to clogging. The present invention relates to a cleaning composition that removes ink used for printing, or printing inks such as paste, from a used screen plate.

[0002]

2. Description of the Related Art In actual printing, it is necessary to change the screen plate used for printing because the quality of the printed material is deteriorated due to the completion of printing work, clogging, etc., and printing cannot be performed or ink is changed. ing. When replacing this screen plate, various inks from the used screen plate,
It is necessary to remove the paste or emulsion.

Conventionally, in the case of such removal, alkylbenzenes such as benzene, toluene or xylene, alcohols such as methanol, ethanol and isopropyl alcohol, ketones such as acetone, methyl ethyl ketone or methyl isobutyl ketone, ethyl acetate or butyl acetate. A large number of organic solvents or mixed solvents thereof, such as esters such as, or hydrocarbon solvents such as hexane and kerosene have been used.

Recently, improvements have been made in terms of flammability, human safety, and odor. For example, JP-A-60-149675 proposes to use a chlorine-based solvent such as methylene chloride and trichloroethane, and JP-A-4-4299 discloses an ethylene-based glycol ether or a glycol ether and water. It is proposed to use a mixture of

[0005]

The above-mentioned conventional organic solvents or mixed solvents thereof have a problem in any one of flammability, human body safety, odor, and detergency.

Further, the cleaning agent composition containing a chlorine-based solvent described in JP-A-60-149675 discloses a cleaning property,
Although it is excellent in flame retardancy, there are problems such as ozone layer destruction, deterioration of working environment, and environmental destruction due to contamination with groundwater, and reduction of these substances and suspension of their use are required.

On the other hand, the chlorine-free detergent composition comprising ethylene-based guaroleyl ether described in JP-A-4-4299 is excellent in flame retardancy and detergency.
However, although this ethylene glycol ether has higher human safety than the above-mentioned chlorine-based detergent composition, there are also reports that the miscarriage rate of women due to use is high, and there is a question of safety. .

The present invention has been made in consideration of the above circumstances, and it is a chlorine-free system, is excellent in human safety while ensuring cleaning properties and flame retardancy, and is suitable for cleaning printing inks. The purpose is to provide a detergent composition which can be used.

[0009]

The detergent composition of the present invention comprises the following components (A) and (B) and water. Component (A): Propylene glycol ether represented by the general formula (1). R ₁ O (C ₃ H ₆ O) _n R ₂ (1) (In the formula, R ₁ and R ₂ are hydrogen or an alkyl group represented by the formula (a), and R ₁ and R ₂ are the same. They may be different, but they are not hydrogen at the same time. N is an integer of 1 to 4.) C _m H _{2m + 1} (a) (In the formula, m is an integer of 1 to 4.) Component (B): Propylene glycol ether acetate represented by the general formula (2). _{CH 3 COO (C 3 H 6} O) n R 3 ... (2) ( wherein, R ₃ is Arukiruki group or a phenyl group,
n is an integer of 1 to 4. In the component A, when R ₁ = R ₂ = H, it is a viscous liquid having a high viscosity and is not suitable for use as a cleaning agent.

Various inks and pastes, which are printing inks, are mainly composed of three components, a color material, a vehicle, and other additives. In the case of inks, colorants are often pigments, which are insoluble in the vehicle. On the other hand, the vehicle is composed of oil, resin, solvent, plasticizer and the like. There are many additives such as wax (wax), metallic soap, and surfactant.

In order to remove printing inks composed of these, it is important to dissolve or peel off the vehicle and additives among the above three. The propylene glycol ethers and propylene glycol ether acetates, which are components of the detergent composition of the present invention, very well dissolve many substances that make up the vehicle and additives. Therefore, it exhibits excellent cleaning properties for printing ink. Further, it is excellent in human safety, odor and detergency even when compared with conventionally used esters such as ethyl acetate and butyl acetate.

Representative examples of the propylene glycol ether of component (A) include propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether and dipropylene. Glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, dipropylene glycol dibutyl ether, tripropylene glycol dimethyl ether, tetrapropylene glycol dimethyl ether or tetrapropylene glycol monobutyl ether Na There is.

Representative examples of the propylene glycol ether acetate as the component (B) include propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether acetate, propylene glycol monophenyl ether acetate and dipropylene glycol. Monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, dipropylene glycol monobutyl ether acetate, dipropylene glycol monophenyl ether acetate, tripropylene glycol monomethyl ether acetate, tripropylene glycol monoethyl ether acetate, tetrapropylene glycol monomethyl ether acetate, etc. That.

The propylene glycol ether of the component A has a large compatibility with water, and when it is mixed with water, the flame retardancy increases, and it is possible to make it nonflammable by increasing the amount of water. . The compatibility with water tends to increase as n in the general formula (1) decreases. On the other hand, the component B alone is not compatible with water, and it is necessary to mix it with the component A to make it compatible with water. The component B has a large dissolving power for the ink component, that is, the cleaning power, and the cleaning power is strong. Component A has a relatively lower detergency for the ink component than component B, but even component A alone can dissolve the ink component and can be practically washed. Next, regarding the odor, the component A tends to be weak and the component B tends to be strong. The composition ratio of the components A and B in the cleaning composition of the present invention is determined in consideration of the above points. The compounds constituting the cleaning composition of the present invention do not destroy the ozone layer, which can improve the use environment.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Table 1 shows embodiments 1 to 6 of the present invention.
Is shown. The detergent composition of each embodiment was prepared by thoroughly mixing the components A, B and water shown in each column of Table 1 in the weight composition ratio. Table 2 shows the cleaning agents of Comparative Examples 1 to 3.

Next, a detergency test was conducted using the above-described embodiment and comparative examples. This test of cleaning property was carried out as follows. First, as marking ink, trade name "S-200W" (Taiyo Ink Co., Ltd.)
Under the trade name "USR-2G" as a solder resist
(Manufactured by Tamura Kaken Co., Ltd.) was selected as a carbon paste under the trade name “TU-30SK” (manufactured by Asahi Kaken Co., Ltd.), and these three types of inks were each applied to a 200 mesh screen plate. 5 g each was applied, dried at room temperature for 30 minutes, and then washed with the cleaning agents shown in Tables 1 and 2.
This cleaning was performed using an ultrasonic cleaning machine with an output of 40 KHz and 100 W.

In this cleaning, the cleaning time was measured until the applied inks could be completely removed visually. An evaluation of this wash is given in Tables 3 and 4. In Tables 3 and 4, “⊚” indicates those that can be washed within 30 seconds, and “○”.
Indicates that the cleaning can be performed within 60 seconds, “Δ” indicates that the cleaning can be performed within 90 seconds, and “x” indicates that the cleaning cannot be performed.

As shown in Tables 3 and 4, in all the embodiments of the present invention, the inks can be completely removed within 30 seconds. In addition, all of the embodiments of the present invention are excellent in human safety, flame retardant, and low risk of ignition.

On the other hand, in Comparative Example 1, all the inks could not be removed within 90 seconds, the flash point was low, and the danger was high. In Comparative Example 2, the marking ink and the solder resist could be removed within 30 seconds, but the carbon paste could not be removed within 90 seconds, and the cleaning property was poor. Moreover, this comparative example 2
Since it is chlorine-based, it has problems of ozone layer destruction, deterioration of working environment, and environmental destruction due to contamination with groundwater. It was found that Comparative Example 3 took 60 to 90 seconds to remove all the inks, and was inferior in cleanability.

Further, in the above-mentioned embodiments, the screen plate was tested for its detergency, but the cleaning composition of the present invention was applied to other articles to which printing inks are attached, such as a printing machine or parts thereof, It can be effectively applied to jigs used in the printing process.

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

[0024]

[Table 4]

[0025]

EFFECTS OF THE INVENTION According to the present invention, the problems such as flammability, human safety, odor and detergency of conventionally used organic solvents are solved, and the ozone layer is destroyed because it is non-chlorine type. Without having to worry about environmental damage due to contamination with groundwater, it has the same cleaning performance as chlorine-based cleaning agents. Therefore, the cleaning composition of the present invention can be sufficiently used as a substitute for conventional organic solvents and chlorine-based cleaning agents. Furthermore, the addition of water makes it non-flammable, which makes it possible to avoid the problem of flammability, thus facilitating handling and storage.

Claims (1)

[Claims] 1. A detergent composition comprising components (A) and (B) and water. Component (A): Propylene glycol ether represented by the general formula (1). R ₁ O (C ₃ H ₆ O) _n R ₂ (1) (In the formula, R ₁ and R ₂ are hydrogen or an alkyl group represented by the formula (a), and R ₁ and R ₂ are the same. They may be different, but they do not become hydrogen at the same time. N is an integer of 1 to 4.) C _m H _{2m + 1} (a) (In the formula, m is an integer of 1 to 4.) Component (B): Propylene glycol ether acetate represented by the general formula (2). CH ₃ COO (C ₃ H ₆ O) _n R ₃ (2) (wherein R ₃ is an alkyl group or a phenyl group, and n is 1
~ Is an integer of 4)