JPH051840B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a cleaning composition for cleaning printed circuit boards that is useful for cleaning difficult-to-clean heavy contaminants such as water-insoluble polymer contaminants adhering to hard surfaces. Many polymeric substances are used to prevent rust or corrosion of metals, and to provide lubricity during processing. For example, acrylic-based polymeric substances are used for press workability of steel plates and rust prevention of materials, and for protective coating during etching of printed circuit boards. These polymeric materials must have strong physical and chemical properties and exhibit their desired effects during the process, and their removal naturally requires significant temperatures,
It required consideration of time. Cleaning of these polymer contaminants can be roughly divided into aqueous alkaline solutions, such as cleaning with only alkalis such as sodium hydroxide, potassium hydroxide, and sodium silicate, and alkaline cleaning with a combination of these alkalis and chelating agent surfactants. The main treatment was with drugs. On the other hand, the solvent type consists of a chlorinated solvent such as methylene chloride, a solvent evaporation inhibitor such as paraffin or phenol, a surfactant, etc. The acid type uses an organic acid, and the alkaline type uses an amine as a promoter. The type used is used. However, both the alkaline aqueous solution type and the solvent type require relatively long cleaning times, and the alkaline aqueous solution type requires a cleaning temperature of 90°C or higher, and even if these conditions are met, it is still sufficiently effective. It didn't reach that point. The present inventor has arrived at the present invention as a result of intensive research to solve these problems. That is, the present invention provides monoethanolamine, triethanolamine, cyclohexylamine, and
5 to 95 parts by weight, preferably 20 to 90 parts by weight of one or more amines selected from 18 alkylamines, high boiling point solvents selected from ethylene glycol monoethyl ether, diethylene glycol monobutyl ether and benzyl alcohol. 0.2 to 50 parts by weight of one or more types, preferably 2 to 20 parts by weight, 0.1 part of one or more types of solvent-soluble surfactants in the liquid to be cleaned
The present invention provides a cleaning composition for cleaning printed circuit boards, characterized in that the composition contains 80 parts by weight, preferably 0.5 to 10 parts by weight. In addition, the solvent-soluble surfactant for the liquid to be cleaned in the present invention refers to a surfactant that dissolves in the above-mentioned solvents, and when cleaning is carried out in an alkaline aqueous solution type, a surfactant such as a polyoxyethylene dodecyl phenyl ether type is used. Nonionic surfactants, anionic surfactants such as polyoxyethylene alkyl ether phosphate esters, and amphoteric surfactants such as alkylcarboxybetaine are effective. Nonionic surfactants such as ethylene dodecyl phenyl ether type, anionic surfactants such as polyoxyethylene alkyl ether phosphate ester type, and cationic surfactants such as polyoxyethylene alkyl amine type are soluble in the solvent. It is valid. Furthermore, there is no problem in using sodium hydroxide or potassium hydroxide in combination with alkaline aqueous solution type cleaning. Trichloroethylene and 1,1,1-trichloroethane are generally representative for solvent-based cleaning. When cleaning difficult-to-clean heavy materials such as water-insoluble polymer contamination, the base of the cleaning agent is amines of the group, and the composition of the amines is 5 to 95.
Parts by weight, preferably 20 to 90 parts by weight; if it is less than 5 parts by weight, cleaning of the substance to be cleaned will not be achieved;
If it exceeds 95 parts by weight, the effect will decrease depending on the balance with other ingredients. In addition, the high boiling point solvents of the group are 0.2 to 50 parts by weight,
Preferably, the amount is 2 to 20 parts by weight; if it is less than 0.2 parts by weight, cleaning of the substance to be cleaned will not be achieved, and if it exceeds 50 parts by weight, the effectiveness will decrease due to the balance with other components. The ionicity of the surfactant may differ depending on whether it is an alkaline aqueous solution type or a solvent type surfactant, but its composition is 0.1 to 80 parts by weight, preferably 0.5 to 80 parts by weight.
The amount is 10 parts by weight, and if it is less than 0.1 part by weight, low-temperature cleaning properties and cleaning time shortening effects cannot be achieved.
Moreover, if it exceeds 80 parts by weight, the effect will be reduced due to the balance with other ingredients, and furthermore, it is economically unfavorable. 5 to 95 parts by weight of one or more amines, preferably
20 to 90 parts by weight, 0.2 to 50 parts by weight of one or more high boiling point solvents
parts by weight, preferably 2 to 20 parts by weight, and 0.1 to 80 parts by weight, preferably 0.5 to 10 parts by weight of one or more surfactants.
In alkaline aqueous solution type cleaning, sodium hydroxide and potassium hydroxide can also be used together in an aqueous solvent, and in solvent type cleaning, trichlorethylene, 1,1,1-
Cleaning can be performed with a chlorine solvent such as trichloroethane. In general, it is practical for cleaning difficult-to-clean heavy contaminants such as mineral oil, animal and vegetable oil contamination, as well as water-insoluble polymer contamination, and it is possible to shorten the cleaning time and lower the cleaning temperature. Amines are cleaning agents for difficult-to-clean heavy contaminants such as water-insoluble polymer contamination, and have a swelling-denaturing effect on contaminants and exfoliate and clean contaminants. On the other hand, high boiling point solvents exhibit swelling and modification promoting effects, and the mutual effect of amines and high boiling point solvents exhibits cleaning properties. Next, surfactants have the effect of shortening cleaning time and improving low-temperature cleaning performance compared to the effects of amines and high-boiling solvents. The cleaning agent of the present invention is mainly effective in cleaning heavy contaminants that are difficult to clean, such as water-insoluble polymer contamination. The unique effects of the present invention are exhibited. Next, the present invention will be specifically explained with reference to Examples. Examples A cleaning composition having the formulation shown in Table 1 was subjected to the following tests, and the results were compared to
It is shown in Table 5. Alkaline aqueous solution type immersion cleaning test (Test results are shown in Table 2) Board to be cleaned: Phenyl glycidyl ether acrylate [UV cure type] resin-coated steel plate Cleaning agent Concentration: 40% active ingredient aqueous solution Cleaning time: [Static immersion] ] 10 minutes cleaning temperature: 75℃ and 90℃ Alkaline aqueous spray cleaning test (Test results are shown in Table 3) Board to be cleaned: Ethyl acrylate, styrene type [water dispersion type] resin-coated steel plate Cleaning agent concentration: 4% aqueous solution of active ingredient Cleaning time: [Spray pressure 3Kg/cm ² ] 3 minutes and 6 minutes Cleaning temperature: 65℃ Solvent type [trichlorethylene] immersion cleaning test (Test results are shown in Table 4) Board to be cleaned: Phenyl glycidyl ether acrylate [UV cure type] Resin-coated steel plate cleaning agent concentration: 5%/trichlorethylene Cleaning time: [Standing immersion] 15 minutes Cleaning temperature: 30℃ and 45℃ Solvent type [Methylene chloride] Ultrasonic cleaning test ( The test results are shown in Table 5) Board to be cleaned: Ethyl acrylate, styrene [water dispersion type] resin-attached glass plate Cleaning agent concentration: 3%/methylene chloride Cleaning time: [Ultrasonic cleaning 28KHZ] 1 minute and 5
minutes Cleaning time: 30°C As is clear from the test results, compared to the cleaning agent [1] of the present invention, the comparative cleaning agent [1] has no group and has a generally lower cleaning level. Comparative detergent [2] was a group outside the scope of the present invention, and therefore had poor effectiveness especially under low temperature conditions. The test results show that compared to the cleaning agent of the present invention [2], the comparative cleaning agent [3] was less effective particularly under short-time cleaning conditions because group (a) was outside the scope of the present invention. Comparative cleaning agent [4] had no groups and its cleaning level was generally low. The test results show that compared to the cleaning agent of the present invention [3], the comparative cleaning agent [5] had no groups and had a particularly low low-temperature cleaning level, and the comparative cleaning agent [6] had no groups and was inferior in effectiveness. The test results show that compared to the cleaning agent of the present invention [4], the comparative cleaning agent [5] had no groups and was inferior, especially in short-time cleaning, and the comparative cleaning agent [7] had no groups and was generally inferior in effectiveness.

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Claims (1)

[Claims] 1. 5 to 95 parts by weight, preferably 20 to 90 parts by weight of one or more amines selected from monoethanolamine, triethanolamine, cyclohexylamine, and alkylamines having 6 to 18 carbon atoms.
parts by weight, 0.2 to 50 parts by weight, preferably 2 to 20 parts by weight, of one or more high-boiling solvents selected from ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, and benzyl alcohol; 1 or more types 0.1
A cleaning composition for cleaning printed circuit boards, characterized in that the cleaning agent composition comprises 80 parts by weight, preferably 0.5 to 10 parts by weight.