JP3078509B2 - Cleaning composition for screen printing plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition for cleaning ink or conductive paste adhered to a screen printing plate.

[0002]

2. Description of the Related Art Conventionally, chlorine-based solvents such as trichloroethane and dichloroethylene have been used for cleaning to remove ink and conductive paste adhering to a screen printing plate. In some cases, the detergency is insufficient, and the use is restricted due to problems such as environmental destruction, and the device is no longer used. Therefore, in recent years, instead of these chlorine solvents, hydrocarbon solvents,
A cleaning composition using an alcohol solvent or a mixture of a glycol ether solvent and water (for example,
Using a detergent composition containing an ester solvent (for example, JP-A-4-42523).
A method of applying ultrasonic waves for cleaning has been performed.

[0003]

However, hydrocarbon-based solvents and alcohol-based solvents have low flash points and high danger, and the cleaning power is insufficient depending on the type of ink adhered to them. poor. Further, when a detergent composition containing a mixture of a glycol ether-based solvent and water or an ester-based solvent is used at a high temperature, due to a change over time, oxidation or hydrolysis occurs, so that the cleaning property cannot be maintained, and odor is reduced. There are problems such as getting worse. The present invention
An object of the present invention is to provide a detergent composition for screen printing plates which solves these problems and has excellent detergency for various inks and is satisfactory in environmental characteristics, toxicity and odor.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, have found that a specific detergent composition meets this object, and have reached the present invention. That is, the present invention provides (A) a glycol ether represented by the following general formula (1), (B) an acetate compound represented by the following general formula (2), (C) an epoxy compound having 4 to 18 carbon atoms, or Carbodiimide compounds,
(D) A cleaning composition for screen printing plates comprising a phenolic antioxidant and water. R ¹ O (C _m H _2m O) _n R ² (1) (R ¹ is an alkyl group having 1 to 8 carbon atoms or a phenyl group,
R ² is hydrogen or an alkyl group having 1 to 8 carbon atoms;
An integer of 3 and n represents an integer of 1 to 4. ) (R ³ represents an alkyl group having 1 to 8 carbon atoms, an alkoxyalkyl group or an acetyl group having 2 to 8 carbon atoms, m represents an integer of 2 to 3, and n represents an integer of 0 to 4. However, R ³ represents acetyl. In the case of a group, n is an integer of 1 to 4.)

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, examples of the alkyl group having 1 to 8 carbon atoms represented by R ¹ and R ² in the general formula (1) of (A) include methyl, ethyl, propyl and butyl. Group, isopropyl group and tert-butyl group, hexyl group, octyl group and the like. Among them, preferred are alkyl groups having 1 to 4 carbon atoms. C in the formula
_m H _2m O represents an oxyethylene group or an oxypropylene group. n is usually an integer of 1 to 4, preferably 2 or 3. When n is 2 or more, the addition form of the alkylene oxide may be a single form, or a random or block form thereof.

Specific examples of (A) include alkylene glycol monoalkyl ethers (diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether,
Diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, triethylene glycol monobutyl ether, ethylene propylene glycol monomethyl ether, ethylene propylene glycol monoethyl ether, ethylene propylene glycol monopropyl ether, Ethylene propylene glycol monobutyl ether, diethylene propylene glycol monomethyl ether, diethylene propylene glycol monoethyl ether, diethylene propylene glycol monopropyl ether, diethylene propylene glycol monobutyl ether, triethylene propylene glycol monomethyl ether, triethyl Propylene glycol monopropyl ether, triethylene propylene glycol monobutyl ether, tetraethylene propylene glycol monoethyl ether, ethylene dipropylene glycol monomethyl ether, ethylene dipropylene glycol monoethyl ether, ethylene dipropylene glycol monopropyl ether, ethylene dipropylene glycol mono Butyl ether, ethylene propylene glycol monotert-butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, etc., alkylene glycol dialkyl ethers (diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triet Glycol dimethyl ether, triethylene glycol diethyl ether, diethylene glycol methyl ethyl ether,
Diethylene glycol methyl isopropyl ether, diethylene glycol dibutyl ether, dipropylene glycol dimethyl ether, etc.) and mixtures thereof.

In the present invention, examples of the alkyl group having 1 to 8 carbon atoms for R ^{3 in} the general formula (2) of (B) include methyl, ethyl, propyl, butyl, isopropyl and tert-alkyl. Examples include a butyl group, a hexyl group, and an octyl group. Of these, preferred are those having 1 carbon atom.
To 4 alkyl groups. Examples of the alkoxyalkyl group having 2 to 8 carbon atoms include a methoxyethyl group, a 2-methoxypropyl group, a 3-methoxybutyl group, and a 3-methoxy-
Examples thereof include a 3-methylbutyl group, a 3-ethoxybutyl group, and a 3-ethoxy-3-methylbutyl group. C in the formula
_m H _2m O represents an oxyethylene group or an oxypropylene group. n is usually an integer of 0-4, preferably 1-2. When n is 2 or more, the addition form of the alkylene oxide may be a single form, or a random or block form thereof.

[0008] Specific examples of (B) include diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monobutyl ether acetate, triethylene glycol monomethyl ether acetate, triethylene glycol monoethyl ether acetate, triethylene glycol monoethyl ether acetate, and triethylene glycol monoethyl ether acetate. Ethylene glycol monopropyl ether acetate, triethylene glycol monobutyl ether acetate, ethylene propylene glycol monomethyl ether acetate, ethylene propylene glycol monoethyl ether acetate, ethylene propylene glycol monopropyl ether acetate, ethylene propylene glycol monobutyl acetate Ruacetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether acetate, dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, dipropylene glycol monobutyl ether acetate, propylene glycol diacetate, dipropylene Propylene glycol diacetate, methoxyethyl acetate, 2-methoxypropyl acetate, 3-methoxybutyl acetate, 3-
Examples include methoxy-3-methylbutyl acetate, 3-ethoxybutyl acetate, 3-ethoxy-3-methylbutyl acetate, and mixtures thereof.

(C) is an epoxy compound or a carbodiimide compound having 4 to 18 carbon atoms. (C) is used as a stabilizer for suppressing the hydrolysis of the acetate compound in the cleaning composition of the present invention. An epoxy compound is a compound having at least one epoxy group in a molecule,

Specific examples of the epoxy compound include 1,
2-butylene oxide, 2,3-butylene oxide, 1,2-epoxyhexane, 1,2-epoxyoctane, 1,2-epoxydecane, 1,2-epoxidedodecane, 1,2-epoxytetradecane, cyclohexene oxide, Butadiene dioxide, methyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether and the like. Among them, those having 4 to 18 carbon atoms are preferable, and those having 4 to 14 carbon atoms are more preferable. Examples of the carbodiimide-based compound include those substituted with a dihydrocarbon. Specific examples include dipropylcarbodiimide, dibutylcarbodiimide, dicyclohexylcarbodiimide, and diphenylcarbodiimide.
(C) may be used alone or in combination of two or more.

(D) is used as a stabilizer for preventing the oxidation of glycol ether in the cleaning composition of the present invention.

(D) Examples of the phenolic antioxidant include hindered phenolic compounds and hydroquinone compounds, and specific examples thereof include 2-t-butyl-4.
-Methoxyphenol, 3-tert-butyl-4-methoxyphenol, 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-1,4-benzenediol,
2,2′-methylenebis (4-methyl-6-t-butylphenol), monomethylhydroquinone, 2,5-di-t-butylhydroquinone and the like. Preferred among these is 2,6-di-t-butyl-4-methylphenol. (D) may be used alone or in combination of two or more.

The content of (A) in the detergent composition of the present invention is preferably 20 to 80% by weight, and the content of (B) is preferably
The content of (C) is preferably from 15 to 80% by weight, preferably from 0.05 to 5.0% by weight, more preferably from 0.2 to 5.0% by weight.
~ 2.0 wt%, the content of (D) is preferably 0.00
1 to 1.0% by weight and more preferably 0.01 to 0.1% by weight.
The water content is preferably 5 to 30% by weight, and more preferably 10 to 20% by weight, from the viewpoint of flammability and detergency.
% By weight. The mixing ratio of (A) :( B) is preferably from 8: 2 to 3: 7 from the viewpoint of detergency.

[0014]

EXAMPLES The present invention will be described in detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.

Examples 1 to 10 and Comparative Examples 1 to 4 Detergent compositions shown in Table 1 were prepared and subjected to stability tests and detergency tests. The results are shown in Tables 1 and 2.

<Stability Test> The cleaning compositions of Examples 1 to 10 and Comparative Examples 1 to 4 were placed in a thermostat at 50 ° C.
Left for months. Changes in pH, acid value, and odor before and after the test were confirmed.

[0017]

[Table 1]

<Washability Test> The following inks A to E were separately applied to a 250-mesh gauze-screened polyester screen printing plate, and air-dried at 25 ° C. for 30 minutes before use. Ink A: Acrylic-based ink B: Polyester-based ink C: Epoxy-based ink D: Urethane-based ink E: Vinyl-based Ink immediately after preparation of the cleaning compositions of Examples 1 to 10 and Comparative Examples 1 to 4 and at 50 ° C. What was left in the thermostat for 3 months was subjected to ultrasonic cleaning at 40 ° C. for 60 seconds, and the adhesion of the ink on the screen plate was visually observed and evaluated according to the following five grades. Evaluation criteria ◎: Ink was completely washed. ○: Ink remained very slightly. ：: Ink remained thinly in a film form. X: A large amount of ink remained. ×: No cleaning effect was observed.

[0019]

[Table 2]

[0020]

The cleaning composition of the present invention can maintain the cleaning properties without causing oxidation or hydrolysis due to aging at high temperatures. Further, since it is a non-chlorine type, there is no risk of environmental destruction, and it is extremely useful as a cleaning agent for cleaning ink and conductive paste adhered to a screen printing plate, which is satisfactory in terms of toxicity and odor.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C11D 7/50 C11D 7/26 C11D 7/32

Claims (3)

(57) [Claims] 1. A glycol ether represented by the following general formula (1): (B) an acetate compound represented by the following general formula (2): (C) an epoxy compound having 4 to 18 carbon atoms Or a detergent composition for screen printing plates comprising a carbodiimide compound, (D) a phenolic antioxidant and water. General formula: R ¹ O (C _m H _2m O) _n R ² (1) (R ¹ is an alkyl group having 1 to 8 carbon atoms or a phenyl group,
R ² is hydrogen or an alkyl group having 1 to 8 carbon atoms;
An integer of 3 and n represents an integer of 1 to 4. ) (R ³ represents an alkyl group having 1 to 8 carbon atoms, an alkoxyalkyl group or an acetyl group having 2 to 8 carbon atoms, m represents an integer of 2 to 3, and n represents an integer of 0 to 4. However, R ³ represents acetyl. In the case of a group, n is an integer of 1 to 4.) 2. The content of (A) is 20 to 80% by weight,
The content of (B) is 15 to 80% by weight, and the content of (C) is 0.1 to 80% by weight.
05-5.0% by weight, the content of (D) is 0.001-1.
0% by weight, water content is 5 to 30% by weight, (A):
The cleaning composition according to claim 1, wherein (B) is from 8: 2 to 3: 7. (C) is an aliphatic epoxy compound having 4 to 14 carbon atoms, and (D) is 2,6-di-t-butyl-4.
3. The cleaning composition according to claim 1, which is -methylphenol.