JP3483051B2 - Cleaning agent for removing ink for printed circuit boards and ink for electronic components - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ink for printed circuit boards.
And a cleaning agent for removing ink for electronic parts .

[0002]

2. Description of the Related Art In the manufacture of printed circuit boards, various inks are used for the purpose of forming a circuit pattern and protecting the board from heat during soldering. Specific examples of the ink include, for example, a silver paste or a conductive paste for forming electrodes or circuits; a resistance paste for forming a resistor; Insulating paste used to prevent external impact, contact, moisture, etc .; Etching resist used when forming a circuit from a copper clad board;
A solder resist or the like used for the purpose of protecting parts other than the soldered part on the substrate from heat during soldering can be exemplified. Furthermore, printing in key and used for a variety of marking of the electronic components and the like may also be listed.

A screen printing method is the most general method for supplying these various inks to a specific place on a material to be printed. In the case of screen printing, in order to form an accurate and fine pattern, it is necessary to apply various kinds of ink to the material to be printed accurately and in an appropriate amount. Therefore, it is usually necessary to regularly wash and remove the ink from the screen printing plate to prevent clogging of the screen printing plate.

Conventionally, as such a cleaning agent, 1, 1, 1
-Halogenated hydrocarbon solvents such as trichloroethane and freon, and alcohols such as isopropyl alcohol have been used. However, the use of halogenated hydrocarbon solvents will soon be restricted due to environmental damage such as the ozone layer and work hygiene problems. Further, the above alcohols are difficult to handle because they have a low flash point and thus have a high risk of fire and may damage an adhesive portion (joint portion between the frame and the mesh) of the screen printing plate.

[0005]

SUMMARY OF THE INVENTION The present invention is a printing substrate.
Excellent detergency against the ink and the electronic component inks plate, yet without adverse effects on the environment and the human body, no flammability, excellent the ink without damaging the screen printing plate
It aims at providing the cleaning agent for removing .

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that the above-mentioned problems can be solved when a specific glycol ether is used as an essential component. The present invention has been completed and the present invention has been completed.

That is, the present invention is

[0008]

Embedded image General formula (1):

(In the formula, R ¹ is a hydrogen atom or a carbon number 1
The alkyl group ~ 6, R ² is an A cetyl group, R ³ is a hydrogen atom or a methyl radical, n is 50 wt% or more of the glycol ether represented by an integer from 1 to 3),
And does not contain a water-insoluble petroleum-based organic solvent
Printed circuit board ink and electronic component ink
Cleaning agent to remove .

Examples of the glycol ethers represented by the general formula (1) include diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monobutyl ether acetate and the like. Alternatively, two or more kinds may be appropriately combined and used.
These glycol ethers are preferable from the viewpoint of detergency.

In the detergent of the present invention, the content of the glycol ether represented by the general formula (1) is 50% by weight.
That is all. From the viewpoint of detergency, it is preferably 70% by weight or more. In the cleaning agent of the present invention, if necessary, water, a surfactant, etc. may be added, and a water-soluble organic solvent other than the glycol ethers may be added within a range not departing from the objects and effects of the present invention. You may add. The water-soluble organic solvent is represented by the general formula (2):

[Chemical 4] (In the formula, R ¹ is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, R ² is an alkyl group having 1 to 8 carbon atoms, R ³ is a hydrogen atom or a methyl group, and n is an integer of 1 to 3. Indicates)
The glycol ethers represented by Examples of the glycol ether represented by the general formula (2) include diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monoethyl ether, diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, Diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol monodimethyl ether, triethylene glycol diethyl ether, etc. It can be used in combination of two or more as appropriate.

The screen printing plate on which various inks are adhered can be washed with the cleaning agent of the present invention in the same manner as in the case of using a conventionally known cleaning agent. For example, immerse the printing plate in a cleaning agent to wash it manually, or use a shower,
Mechanical cleaning can be performed using various types of cleaning devices such as ultrasonic waves and submerged jets. The use temperature of the cleaning liquid is not particularly limited, and usually room temperature is sufficient, but it may be heated to about 60 ° C. After the washing step, a water rinsing step is performed in order to remove the cleaning agent remaining on the screen printing plate. Thereafter, the screen printing plate can be naturally dried or, if necessary, forcedly dried, and then subjected to a screen printing step.

[0013]

According to the present invention, an ink for printed circuit boards is provided.
And ink for electronic parts (silver paste, conductive paste,
Resistance paste, insulation paste, etching resist,
Ruder resist and marking printing in for electronic components
It is possible to provide an excellent cleaning agent for ink removal, which has excellent cleaning power against ( i) , has no adverse effect on the environment and human body, has no flammability, and does not damage the screen printing plate.

[0014]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 Diethylene glycol monoethyl ether acetate 1
A detergent A of the present invention consisting of 100 parts by weight was prepared.

Test method: 4 kinds of ink (a: silver paste manufactured by Shin Nippon Kakin Co., Ltd., trade name "T-70", b: conductive paste manufactured by Shoei Chemical Industry Co., Ltd., trade name "D-4344" ,
c: Resist ink manufactured by Asahi Chemical Laboratory, trade name "UV
R-8500G ", d: printing ink, manufactured by Dainippon Ink and Chemicals, Inc., product name" DIYCURE SSD ") is applied to a separate screen printing plate, left for 30 minutes, and then these are washed with a shower cleaning device. Used, and cleaning agent A has a temperature of 4
Washed at 0 ° C for 5 minutes. Then, after rinsing with water, 4
It was dried at 0 ° C. It was observed under a microscope whether ink stains remained on the mesh portion of each screen printing plate. The judgment criteria are as follows. ◯: No residue, Δ: Partial residue, ×: Almost residual result is shown in Table 2.

Examples 2 to 3 and Comparative Examples 1 to 2 Cleaning was carried out in the same manner as in Example 1 except that the cleaning agents shown in Table 1 were prepared and used in place of the cleaning agents of Example 1. The cleaning performance was evaluated. The results are shown in Table 2.

[0018]

[Table 1] DEGMBE: Diethylene glycol monobutyl ether DEGMEEAc: Diethylene glycol monoethyl ether acetate softanol 90: Nonionic surfactant manufactured by Nippon Shokubai Chemical Co., Ltd.

[0019]

[Table 2]

Continuation of the front page (56) Reference JP-A-57-202399 (JP, A) JP-A-1-299878 (JP, A) JP-A-7-70488 (JP, A) JP-A-59-176398 (JP , A) JP 5-156185 (JP, A) JP 5-271587 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09D 9/00

Claims (4)

(57) [Claims] 1. A general formula (1): ## STR1 ## (In the formula, R ¹ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, R ² represents an acetyl group, R ³ represents a hydrogen atom or a methyl group, and n represents an integer of 1 to ^3. ) A cleaning agent for removing inks for printed boards and inks for electronic parts, which contains 50% by weight or more of glycol ethers, and does not contain a water-insoluble petroleum-based organic solvent. 2. A printed circuit board ink and an electronic component ink are silver paste, conductive paste, resistance paste, insulating paste, etching resist, solder resist,
The cleaning agent according to claim 1, which is at least one kind selected from the group consisting of a marking printing ink for electronic parts. 3. The cleaning agent according to claim 1, which further comprises at least one selected from the group consisting of water, a surfactant and a water-soluble organic solvent as an additional component. 4. The water-soluble organic solvent is general formula (2): ## STR2 ## (In the formula, R ¹ is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, R ² is an alkyl group having 1 to 8 carbon atoms, R ³ is a hydrogen atom or a methyl group, and n is an integer of 1 to 3. Indicates)
The cleaning agent according to claim 3, which is a glycol ether represented by: