JPH08218011A - Cleaning solvent composition - Google Patents

Abstract

PURPOSE: To obtain a cleaning solvent composition composed of a specific composition, not disrupting ozone layer and free from fear of environmental disruption because of non-chlorine-based composition in spite of the absence of flash point, excellent also in cleaning property and useful for cleaning of screen printed board. CONSTITUTION: This composition contains (A) glycol ethers of the formula, R1 O(CH2 CH2 O)n R2 [R1 and R2 are each H or a 1-8C alkyl; (n) is 1-3], (B) a lactic acid ester, (C) dimethylsulfoxide, (D) triethyl phosphate and (E) water. The composition is preferably obtained by blending 41.7vol.% triethylene glycol dimethyl ether as the component A with 25vol.% ethyl lactate as the component B, 16.7vol.% of the component C, 8.3vol.% of the component D and 8.3vol.% of the component E.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a cleaning composition used for cleaning a screen printing plate.

[0002]

2. Description of the Related Art Screen plates used for printing with various inks and pastes are washed with various organic solvents and stored after printing. Examples of conventional cleaning compositions used for this cleaning include organic solvents such as alcohols, ketones and esters, chlorine-based solvents such as methylene chloride and trichloroethane described in JP-A-60-149675, and JP-A-4. Known are the glycol ethers or the mixture of glycol ethers and water described in JP-A-4299, and the mixture of glycol ethers and hydrocarbons described in JP-A-5-239495.

[0003]

However, although the chlorine-based cleaning composition is excellent in detergency and flame retardancy,
Due to problems such as destruction of the ozone layer, deterioration of the working environment, and environmental damage due to contamination with groundwater, reduction of their use is required. On the other hand, the above-mentioned various cleaning compositions have a strong flammability, and there is a problem that requires caution in use.

The present invention has been made in consideration of such circumstances, and by using a chlorine-free system, it has excellent cleaning properties and can be suitably used for cleaning screen printing plates. The purpose is to provide.

[0005]

Means and Actions for Solving the Problems Cleaning of the Invention
The composition has the formula R₁O (CH₂CH₂O)_nR₂(In the formula,
R₁, R ₂Is hydrogen or an alkyl group having 1 to 8 carbon atoms
And n is an integer of 1 to 3. ) Glycol
Ethers, lactic acid esters, dimethyl sulfoxide
And containing triethyl phosphate and water
I do.

In the glycol ethers of the above formula, the alkyl group having 1 to 8 carbon atoms for R ₁ and R ₂ is a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group,
There are hexyl group, octyl group, isopropyl group, ter-butyl group, 2-ethylhexyl group and the like. This R ₁ ,
R ₂ may be the same or different.

The glycol ethers represented by the above formula include ethylene glycol, diethylene glycol,
Glycols such as triethylene glycol, ethylene glycol monobutyl ether, ethylene glycol monopentyl ether, ethylene glycol monohexyl ether, ethylene glycol monooctyl ether,
Diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monopentyl ether, diethylene glycol monohexyl ether, diethylene glycol monooctyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monoethyl ether Ethylene glycol monoalkyl ethers such as propyl ether, triethylene glycol monobutyl ether, triethylene glycol monopentyl ether,
Examples include dialkyl ethers of ethylene glycol such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, and triethylene glycol dibutyl ether. Lactic acid esters in the cleaning composition include methyl lactate, ethyl lactate, butyl lactate, pentyl lactate and the like.

In consideration of detergency, safety, flammability, and compatibility with water, triethylene glycol dimethyl ether (flash point: 1
13 ° C., viscosity 3.8 cps (20 ° C.) is preferable, and ethyl lactate (viscosity 2.6 cps (2
0 ° C.)) is preferred.

The dimethyl sulfoxide (flash point: 95 ° C., viscosity 2.0 cps (25 ° C.)) and triethyl phosphate (flash point: 110 ° C.) used in the present invention have detergency, safety, flammability, and water compatibility. Excellent compatibility. The cleaning composition of the present invention may contain other cleaning agents in order to further enhance the cleaning effect.

The preferred content of each component of the present invention is 35-45 vo of triethylene glycol dimethyl ether.
1%, 20-30 vol% ethyl lactate, 10-20 vol% dimethyl sulfoxide, and 8.3 vol% volumetric mixing ratio of triethyl phosphate and water, but the most preferable content of each component is triethylene glycol dimethyl ether. Is 41.7 vol% and ethyl lactate is 25 vol
%, Dimethyl sulfoxide is 16.7%, and the volume mixing ratio of triethyl phosphate and water is 8.3 vol%.

[0011]

EXAMPLES Table 1 shows the mixed composition ratio (vo) of each example of the present invention.
1%) and Table 2 shows the mixed composition ratio of the comparative example. The compounds of these Examples and Comparative Examples were mixed to prepare a cleaning composition, and their cleaning properties, flammability, and influence on the environment were compared.
The results are shown in Table 3.

[0012]

[Table 1]

[0013]

[Table 2]

[0014]

[Table 3]

The test method for detergency in Table 3 is 200
Apply each cleaning object (about 5g) to the mesh screen, and after 30 minutes at room temperature, ultrasonic cleaning machine (39kHz,
It was performed by washing with 100 W) and visually evaluating. In the column of detergency, "◎" can be washed within 30 seconds, "○" can be washed within 60 seconds, and "△" is 90.
It is possible to wash within seconds, and “x” indicates that washing is impossible. In addition,
The marking ink for the cleaning object is "S-200W" manufactured by Taiyo Ink Co., Ltd., and the solder resist is "USR-2" manufactured by Tamura Kaken Co., Ltd.
As the carbon paste for “G”, a trade name “TU-30SK” manufactured by Asahi Kaken Co., Ltd. was used. As shown in Table 3, each of the examples of the present invention has the same or higher detergency as that of the comparative example, and has an ozone depletion coefficient of 0 even though it has no flash point.

EFFECTS OF THE INVENTION The cleaning composition of the present invention is a non-chlorine type even though it has no flash point, so that it does not destroy the ozone layer and does not cause environmental damage due to contamination with groundwater. It has a detergency equivalent to that of a system cleaning agent. Therefore, it can be used for cleaning screen printing plates as an alternative to CFC-based and chlorine-based cleaning agents.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C11D 7:34 7:36)

Claims (3)

[Claims] 1. The formula R ₁ O (CH ₂ CH ₂ O) _n R ₂ (wherein R ₁ and R ₂ are hydrogen or an alkyl group having 1 to 8 carbon atoms, and n is an integer of 1 to 3). A cleaning composition containing a glycol ether represented by the formula (1), a lactic acid ester, dimethylsulfoxide, triethyl phosphate, and water. 2. The cleaning composition according to claim 1, wherein the glycol ether is triethylene glycol dimethyl ether and the lactate ester is ethyl lactate. 3. Triethylene glycol dimethyl ether is 35 to 45 vol% and ethyl lactate is 20 to 30 vol.
The cleaning composition according to claim 1, wherein 1%, cymethylsulfoxide is 10 to 20 vol%, and the volume mixing ratio of triethyl phosphate and water is 8.3 vol%.