JPH0693296A - Detergent composition - Google Patents

Abstract

PURPOSE:To obtain a water-based detergent having detergency, influences on printed boards, water rinsing properties and drain treating properties. CONSTITUTION:The water-based detergent composition is composed of a composition prepared by mixing hydrogenated terpenes such as p-cymene, p-menthane, gamma-terpinene, terpinolene or dihydroterpineol with a surfactant such as polyoxyethylene alkyl ethers.

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 cleaning a printed circuit board having an electric circuit and an electronic circuit formed thereon.

[0002]

2. Description of the Related Art Electronic components are mounted on a printed circuit board that constitutes an electric circuit by soldering. With recent miniaturization and high density packaging of electronic components, the circuit pattern width has become high. Further, in such a printed circuit board, a high level of cleanliness is required on the surface of the board after mounting electronic components. Therefore, it is necessary to clean the surface of the printed circuit board with a high degree of cleanliness to remove the dirt. Among the dirt, the flux component is a problem. This flux is an essential material for surface treatment before soldering, but if it remains on the surface of the printed circuit board,
This is because corrosion is promoted, which causes circuit destruction.

A mixed composition of a fluorine-based solvent and an alcohol-based solvent has been used as a conventional cleaning agent for printed circuit boards. This is because this cleaning agent has a high cleaning capacity,
This is because it has a characteristic that the printed circuit board is less affected and the safety is high. However, there is a problem that the use of this cleaning agent will be restricted in the future due to the worldwide trend of abolishing halogen-based solvents due to environmental problems that destroy the ozone layer. Therefore, a cleaning agent that does not contain a fluorine-based solvent has been developed. Most of the cleaning agents are aqueous solvents that require rinsing with water in the post-cleaning step. For example, an alkaline saponification type cleaning agent using alkaline soap as a cleaning center component, US Pat. No. 4,511. , 4
No. 88, No. 4,640,719 and No. 4,740,247, the cleaning agent containing terpenes as the main cleaning agent, and JP-A-3-14.
As described in Japanese Patent No. 0486, there is a cleaning agent in which an organic solvent and a surfactant are arbitrarily combined.

[0004]

The above-mentioned water-based cleaning agents are different from the theory of cleaning with a halogen-based solvent, and accordingly, it is necessary to individually change the structure of the cleaning tank. That is, the alkaline saponification type cleaning agent has a problem that the cleaning power itself is highly selective, the rinsing process with water is long, and the load of wastewater treatment is large. Further, the terpene-type cleaning agent has a high cleaning ability that solves the disadvantage of the alkali saponification type, but has a problem that the rinsing property of the cleaning liquid with water performed in the subsequent step is poor. On the other hand, a cleaning agent composed of a combination of an organic solvent and a surfactant also tends to have strong characteristics peculiar to the organic solvent,
There is a problem that the biodegradability and safety of wastewater are low as well as the adverse effect on the printed circuit board material.

As described above, none of the conventional water-based cleaning agents can completely meet the requirements as a cleaning agent for printed circuit boards, but since the water rinsing step is highly useful, the cleaning of the printed circuit boards is improved. Applicability to is required. The basic performance required for a printed circuit board cleaner is
It has a cleaning power to remove the dirt itself, has a low attack property on the substrate, and is easy to rinse the cleaning liquid with water. In addition, for the treatment of rinse water generated when the cleaning agent is rinsed, it is necessary to select a material having a low wastewater treatment load from the viewpoint of pollution prevention and water pollution prevention. Therefore, an object of the present invention is to provide an aqueous detergent composition that solves these problems.

[0006]

Means and Actions for Solving the Problems As a result of intensive studies by the present inventors in order to achieve the above-mentioned object, a composition obtained by combining a specific hydrogenated terpene and a specific surfactant as a hydrogen detergent. There is no effect on the object to be cleaned,
Moreover, they have found that sufficient cleanliness can be obtained and can be easily washed off with water, and the present invention has been completed based on this finding. It was found that hydrogenated terpenes have a large stain-dissolving power and have a small effect on the substrate, and when they are combined with hydrogenated terpenes, they exhibit the best function and have good biodegradability. This is the result of finding an activator.

That is, the detergent composition of the present invention is characterized by comprising hydrogenated terpenes and a surfactant. Here, as hydrogenated terpenes, p-cymene,
One or more of hydrogenated terpenes such as p-menthane, γ-terpinene, terpinolene and dihydroterpineol can be selected. These hydrogenated terpenes have large detergency against flux and have the property of maintaining a constant ability.
It is mixed in the range of 0% by weight.

On the other hand, the surfactant is used for ensuring the water rinsing property, and is mixed in the range of 50 to 90% by weight. For this surfactant, a cation type or nonionic type can be used, but in consideration of the combination property with hydrogenated terpenes and biodegradability,
Nonionic polyoxyethylene alkyl ethers are most suitable. In the present invention, in addition to these, a hydrotrobe, a safety agent and the like can be added in an amount of several% to several tens% as required. In using the cleaning composition of the present invention, the same method as in the case of using an ordinary water-based cleaning agent can be used. That is, in the cleaning, shower cleaning, ultrasonic cleaning, brush cleaning, jet cleaning can be appropriately used, and after these cleaning, water is rinsed and then water is removed by drying with warm air.

[0009]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In the example column No. 1 in Table 1. 1-No. A cleaning composition was prepared by mixing hydrogenated terpenes and a surfactant at a compounding ratio shown in 40, and these cleaning compositions were used for a stain removal test, a substrate attack test, a water rinse test and drainage. It was subjected to a processability test. As a comparative example, limonene alone, water alone, and a mixed solution thereof were similarly subjected to the test.
Below, we will explain each test method and criteria by itemization,
The results are shown in Tables 1 and 2. In Tables 1 and 2, POE represents polyoxyethylene.

[0010]

[Table 1]

[0011]

[Table 2]

(1) Removal of dirt A printed circuit board having electronic components mounted on its surface is used as a test piece, and the printed circuit board is immersed in each cleaning agent kept at 60 ° C. and ultrasonically cleaned for 5 minutes. The flux removability was visually determined. In the stain removal determination column of Table 1, a circle indicates a clean state with no residue of flux stain, a triangle indicates that some flux stain remains, and a mark indicates that most flux stain remains. Show.

(2) Attack on substrate Polycarbonate, polyphenylene oxide, polyacetal (trade name Delrin), polyethylene, polyetherimide, polyethylene terephthalate, ABS resin,
Soak each plastic substrate of polyphenylene sulfide, phenol resin, epoxy resin, nylon 6,6, nylon 6 and polyvinyl chloride resin and each metal substrate of stainless steel, brass, aluminum and copper at room temperature for one day. After leaving it for a while, the attack property to each substrate was confirmed. In the board attackability judgment column of Table 1, ○ indicates that the surface condition of any material has not changed, Δ indicates that some materials have changed, and × indicates many materials. Indicates that it has been altered.

(3) Water rinsing property After each cleaning agent was applied to the surface of the printed circuit board, it was rinsed with water for 5 minutes, and the surface condition was visually observed. In the water rinsing property determination column of Table 1, a circle indicates that a uniform surface condition is confirmed, and a triangle indicates that the surface is partially uneven.
The mark indicates that the surface is hardly rinsed.

(4) Wastewater Treatment The COD of each cleaning agent was measured according to JIS K 0102-17. In the wastewater treatment judgment column of Table 1,
○ indicates 80% or more biodegradability after 1 day, △ indicates 50% or more and less than 80% biodegradability after 1 day, and × indicates 50% after 1 day. It shows the following biodegradability.

[0016]

As described above, the cleaning composition of the present invention has sufficient basic performance required for a cleaning liquid such as cleaning power, influence on a substrate, water rinsing property, drainage treatment property, etc. Can be provided with usefulness.

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[Procedure amendment]

[Submission date] September 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

Means and Actions for Solving the Problems As a result of intensive studies by the present inventors in order to achieve the above object, a composition obtained by combining a specific hydrogenated terpene with a specific surfactant is used as an aqueous detergent. There is no effect on the object to be cleaned,
Moreover, they have found that sufficient cleanliness can be obtained and can be easily washed off with water, and the present invention has been completed based on this finding. It was found that hydrogenated terpenes have a large stain-dissolving power and have a small effect on the substrate, and when they are combined with hydrogenated terpenes, they exhibit the best function and have good biodegradability. This is the result of finding an activator.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

That is, the detergent composition of the present invention is characterized by comprising hydrogenated terpenes and a surfactant. Here, as hydrogenated terpenes, p-cymene,
One or more of hydrogenated terpenes such as p-menthane, γ-terpinene, terpinolene and dihydroterpineol can be selected. These hydrogenated terpenes have a large detergency for the flux and the property of maintaining a constant ability, and are mixed in the range of 10 to 50% by weight.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

On the other hand, the surfactant is used for ensuring the water rinsing property, and is mixed in the range of 50 to 90% by weight. For this surfactant, a cation type or nonionic type can be used, but in consideration of the combination property with hydrogenated terpenes and biodegradability,
Nonionic polyoxyethylene alkyl ethers are most suitable. In the present invention, in addition to these, hydrotro
Group , a safety agent, etc., can be added by several% to several tens% as required. In using the cleaning composition of the present invention, the same method as in the case of using an ordinary water-based cleaning agent can be used. That is, in the cleaning, shower cleaning, ultrasonic cleaning, brush cleaning, jet cleaning can be appropriately used, and after these cleaning, water is rinsed and then water is removed by drying with warm air.

Claims (3)

[Claims] 1. A detergent composition comprising a hydrogenated terpene and a surfactant. 2. The hydrogenated terpenes are p-cymene,
The cleaning composition according to claim 1, which is one of p-menthane, γ-terpinene, terpinolene, dihydroterpineol, or a combination of two or more thereof. 3. The detergent composition according to claim 1, wherein the surfactant is a polyoxyethylene alkyl ether.