JPH1139621A - Cleaning liquid for magnetic recording head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a cleaning liquid for a magnetic recording head that the cleaning effect for a magnetic head is maintained, and thereby, stable electromagnetic conversion characteristics can be obtd. for a long period for a VTR and the like. SOLUTION: The cleaning liquid for a magnetic recording head is prepared by dissolving an org. phosphoric acid compd. of the formula in a single solvent or a mixture solvent of water, alcohol, fluorine-based inert org. solvent and other org. solvents. In the formula, substituents R1 , R2 , R3 are 1 to 24C aliphatic alkyl groups, 1 to 10C halogen-contg. alkyl groups, 1 to 24C ether-contg. substituents or substituents having phenyl groups or a benzene ring structure. The cleaning effect is obtd. when the concn. of the org. phosphoric acid compd. of the formula is controlled to 0.3 to 25 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning liquid for a magnetic recording head such as a video tape recorder (VTR), an audio cassette tape recorder, and a floppy disk for a computer, and obtains a long-term stable electromagnetic conversion characteristic. It is effective for.

[0002]

2. Description of the Related Art Conventionally, as a cleaner for a magnetic head such as a VTR, a magnetic recording medium such as a tape having a rough surface or a medium formed by applying a coating material containing a large amount of abrasive on a non-magnetic support has been prepared. There are a dry type head cleaner for forcibly shaving the head using this medium, and a wet type head cleaner for wiping the head surface with an arbitrary organic medium.

[0003] Since the dry method does not use an organic solvent, it has little effect on electronic devices around the head.
Because of its simplicity, it is commonly used. However, dirt or the like chemically changed due to heat or the like caused by rubbing on the sliding surface of the head cannot be easily removed, and if used frequently, the head may be worn more than necessary. For this reason, broadcasting stations such as televisions
It is common to clean a high-performance mechanism such as a commercial VTR with a cleaning liquid. Also,
A wet cleaner is more effective for cleaning a traveling system such as a capstan of a normal tape recorder.

Heretofore, a cleaning liquid used in a conventional wet-type cleaner has been known from Freon R-133 as described in JP-B-56-55790, focusing on good quick drying properties.
Or ethanol is used.

Further, Japanese Patent Application Laid-Open Nos.
JP-138218 and JP-A-8-161714 disclose the use of perfluoropolyether in a ketone or ester organic solvent without using chlorofluorocarbons on the global environment. Furthermore, a method for improving the cleaning power by using highly soluble N-methylpyrrolidone or the like (Japanese Patent Laid-Open No. 1-119869).
8) has also been reported.

[0006] Here, most of the concretely used ones are a mixture of water and alcohol or a fluorine-based inert organic solvent. In order to improve the friction with the tape after cleaning, trace amounts of fatty acids or fatty acids are used. Some have dissolved esters.

[0007]

However, black-brown stains on the sliding surface of the head that occur when a metal tape is used can be easily wiped off by cleaning.
Also, the surface of the head becomes dirty immediately, and the output deteriorates with time. For this reason, it is necessary to consider a method for maintaining the effect after cleaning.

The present invention has been made in view of such a problem, and a cleaning effect of a magnetic head is maintained.
Accordingly, it is an object of the present invention to provide a magnetic recording head cleaning liquid capable of obtaining stable electromagnetic conversion characteristics for a long time in a VTR or the like.

[0009]

The cleaning liquid for a magnetic recording head according to the present invention may be any one of water, alcohol, fluorine-based inert organic solvent and other organic solvents, a single solvent or a mixed solvent thereof. Phosphoric acid compound (Chemical formula 2)
Is a cleaning liquid for a magnetic recording head.

Embedded image Here, each substituent (R1, R2, R3) has 1 to 1 carbon atoms.
24 aliphatic alkyl groups, a halogen-containing alkyl group having 1 to 10 carbon atoms, an ether-containing substituent having 1 to 24 carbon atoms,
Or a substituent having a phenyl group or a benzene ring skeleton

According to the cleaning liquid for a magnetic recording head of the present invention, an organic phosphoric acid compound (a single solvent or a mixed solvent thereof) of water or an alcohol, a fluorine-based inert organic solvent or another organic solvent is used. The cleaning effect of the magnetic head can be maintained by containing the chemical formula 2).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the cleaning liquid for a magnetic recording head according to the present invention will be described with reference to Tables 1 to 3.

The present invention has been studied in order to achieve the above-mentioned object, and as a result, the present invention has been achieved by internally adding an organic phosphoric acid compound having a substituent (Chemical Formula 3) to a cleaning solution. is there.

[0013]

Embedded image Here, each substituent (R1, R2, R3) has 1 to 1 carbon atoms.
24 aliphatic alkyl groups, a halogen-containing alkyl group having 1 to 10 carbon atoms, an ether-containing substituent having 1 to 24 carbon atoms,
Or a substituent having a phenyl group or a benzene ring skeleton

The phosphoric acid compound represented by Chemical Formula 3 is a compound having a large number of Lone pair electrons that easily form a coordination bond and having a chelating effect on metals such as iron. Due to this chelating effect, a sustained cleaning effect is achieved. That is, after the head cleaning, the phosphoric acid compound contained in the cleaning liquid forms a film on the head surface, and the cleaning effect is maintained.

In the present invention, examples of the phosphate compound that can be used include tricresyl phosphate (TCP), triethyl phosphate (TEP), tributyl phosphate (TBP), tris (2-ethylhexyl) phosphate (TOP), and tri ( Chloroethyl) phosphate (TCEP), tridichloropropyl phosphate (C
RP), tributoxyethyl phosphate (TBX)
P), tris (β-chloropropyl) phosphate (T
MCPP), triphenyl phosphate (TPP), octyl diphenyl phosphate, tris (isopropylphenyl) phosphate, cresyl diphenyl phosphate (CDP), and the like.

The cleaning liquid used in the present invention is a solution in which a phosphoric acid compound represented by Chemical Formula 3 is dissolved, and
It is desirable to have a head cleaning effect. Therefore, the solvent components of the cleaning liquid used in the present invention include water, metamer, ethanol, isopropyl alcohol (IPA), alcohol-based organic solvents such as n-propyl alcohol, and methyl ethyl ketone (ME
K), ketone solvents such as methyl isobutyl ketone (MIBK) and acetone, ester solvents such as ethyl acetate and butyl acetate, aromatic hydrocarbons such as toluene and xylene, hydrocarbons such as pentane, hexane and heptane, and diethyl ether And other organic solvents, chlorofluorocarbons such as Freon, perfluorocarbons, and the like, and other organic solvents. Further, a mixed solvent system of these may be used.

It is necessary that the solvent be fast-drying, be harmless to the human body, not corrode the head and the surrounding base, and dissolve the solute phosphate compound.

Further, since many fast-drying solvents have a low flash point, when they are used, they are mixed with water in an aqueous alcohol-based solvent, or incombustible perfluoro-based in a hydrophobic solvent. It is desirable to mix and use solvents as appropriate.

In the present embodiment, the concentration of the phosphoric acid compound in which the effect is recognized in the solvent is 0.3 to 25% by weight, preferably 0.5 to 25% by weight, more preferably 1 to 25% by weight. % By weight. Here, when the amount is too small, the cleaning effect is not maintained, and when the amount is too large, the durability of the magnetic recording medium is deteriorated by depositing on the head or adversely affecting the friction with the guide. There is.

As a cleaning method, there are a method using a wet cassette type cleaner (FIG. 1) and a method using a cleaning liquid soaked directly into a cloth such as a cloth.

As a substrate to be impregnated with the cleaning liquid, it is preferable to provide a coating layer of carbon black or the like on polyethylene terephthalate or the like usually used in a cleaning tape. Also,
Tape-like cloth materials can also be used. As a cloth material, for example, Toray's trade name and Toray's trade name and Kuraray's trade name wiping cloth are suitable. As the cleaning tape having the configuration shown in FIG. 1, a tape having a tape width or a cassette shape for each recording system is used.

Similarly, in the case where the cleaning liquid is soaked directly into a cloth such as a cloth, the cloth material used is not limited to the material used for the cassette, and any conventionally known cloth material can be used. is there.

By internally adding the phosphoric acid compound of the formula (3) to the cleaning liquid, dust and dirt attached to the magnetic head and dirt from the fallen off the magnetic layer are effectively wiped off. In addition, since a coating is formed on the head after cleaning by the chelating action of the phosphoric acid compound, it is possible to prevent the attachment of the fallout from the magnetic layer.

This coating has an effect of preventing adhesion to the head after catching metal atoms generated where the tape rubs. Therefore, the cleaning effect lasts for a long time. Therefore, it is possible to prevent head clogging, deterioration of the still characteristic, reduction in output level, damage and the like, which are caused by the accumulation of dirt, and prolong the life of the head.

Next, in order to show the actual effect of the present invention,
Examples of the present invention and comparative examples will be described in detail.

Various cleaning liquids shown in Tables 1 to 3 were prepared as cleaning liquids used in Examples and Comparative Examples.

[0027]

[Table 1]

[0028]

[Table 2]

[0029]

[Table 3]

Next, the method of measuring the evaluation items of each of the examples and comparative examples will be described. 8mm VTR (Sony,
Using a cleaning solution (trade name: Toraysee, trade name, manufactured by Toray Industries Co., Ltd.), 1 to 2 ml of the cleaning liquid adjusted to the composition shown in Tables 1 to 3 was used by using BV-S1500 (trade name), and the head was wiped off. After the head cleaning, the electromagnetic conversion characteristics of the reference tape for cleaning test (the tape whose output is particularly apt to deteriorate in order to check the cleaning effect) (7
Mhz output) was measured. Then, at 40 ° C, 20%
Recording and reproduction were performed for 20 hours under the condition of RH. After measuring the electromagnetic characteristics after use for 20 hours, the head was observed with an optical microscope. The initial value of the electromagnetic conversion characteristics was set to zero dB, and the result of observation with an optical microscope was evaluated according to the following criteria. ；: There is no attached matter on the sliding surface of the head. △: There is no attached matter on the head surface, but the color changes to brown. ×: What can confirm the attached of the removed matter. It was confirmed. Further, the same evaluation was performed after recording and reproduction for 20 hours thereafter.

According to Table 1, in Examples 1 to 3 and Comparative Examples 1 to 4, a cleaning solution in which tricresyl phosphate (TCP) was dissolved in toluene was used. As a result, it is found that the concentration is effective when TCP is in the range of 1 to 25% by weight. In Comparative Example 4, the undiluted solution of TCP was used directly, but in this case, there was sticky substance on the head, and after 20 hours of tape running,
Sticking occurred.

According to Table 1, in Examples 4 to 7 and Comparative Examples 5 to 8, tributyl phosphate (TB
A cleaning solution in which P) was dissolved in n-hexane was used. As a result, the concentration of TBP was 0.5 to 25.
It is found to be effective when it is within the range of% by weight. In addition, ethanol (Example 8), toluene (Example 9), water / ethanol (1/1) (here, 1/1
Indicates that the weight ratio is 1: 1. The same applies to the mixed solvents of other examples. (Example 1)
0), water / IPA (1/1) (Example 11), and a perfluorocarbon (Example 12) were used at 0.5% by weight using a solvent. As a result, good results were obtained. From this result, it can be seen that the TBP is 0.5 to
It is found to be effective when it is within the range of 25% by weight.

From Tables 1 and 2, Examples 13 to 1 are shown.
5, and in Comparative Examples 9 to 12, a cleaning liquid in which triphenyl phosphate (TPP) was dissolved in toluene was used. As a result, as the concentration, TPP was 1
It is found to be effective when it is within the range of ２５25% by weight. In addition, as a result of using toluene / IPA (1/1) (1% by weight, Example 16), pentane (0.3% by weight, Example 17) and Freon (1% by weight, Example 18), Good results were also obtained. Considering these results and the results of Examples 13 to 15, it can be seen that the concentration is effective when TPP is in the range of 0.3 to 25% by weight.

As shown in Table 2, in Examples 19 to 21 and Comparative Examples 13 to 16, a cleaning solution in which tridichloropropyl phosphate (CRP) was dissolved in Freon was used. As a result, the concentration was 1 for CRP.
It is found to be effective when it is within the range of ２５25% by weight. In addition, as a result of using a solvent of toluene (Example 22) and perfluorocarbon (Example 23) at 0.5% by weight, good results were obtained in each case. Considering these results and the results of Examples 19 to 21, the concentration was 0.5 to 25% by weight of CRP.
It can be seen that it is effective when it is within the range.

From Tables 2 and 3, Examples 24 to 2 are shown.
7, and Comparative Examples 17 to 20, a cleaning solution in which tris (2-ethylhexyl) phosphate (TOP) was dissolved in IPA was used. As a result, it can be seen that the concentration is effective when TOP is in the range of 1 to 25% by weight. In addition, toluene (1% by weight, Example 28), toluene / IPA (1/1) (1% by weight, Example 29), pentane (0.5% by weight, Example 30), freon (1% by weight) , Example 31), all showed good results. Considering these results and the results of Examples 24 to 27, it is understood that the concentration is effective when TOP is in the range of 0.5 to 25% by weight.

From Table 3, Comparative Example 21 shows the results of a general dry cleaning tape (manufactured by Sony Corporation, trade name: Video Head Cleaning Cassette V8-25CLH). Further, Comparative Examples 22 to 31 are the results of a test in which only a solvent was placed in a wet cassette, and it can be seen that a long-term cleaning effect cannot be expected. Similarly, in Comparative Example 32, the results were obtained with a commercially available cleaning liquid (trade name: Cleaning Kit KK-33, manufactured by Sony Corporation), but the cleaning effect was not maintained.

From the above results, it can be seen from Tables 1 to 3 that Examples 1 to 3 are effective when the concentration of TCP is in the range of 1 to 25% by weight. Also,
In Examples 4 to 12, it can be seen that the concentration is effective when TBP is in the range of 0.5 to 25% by weight. Further, from Examples 13 to 18, it can be seen that the concentration is effective when TPP is in the range of 0.3 to 25% by weight. Example 19
From Example 23, the CRP was 0.5 to 2 as the concentration.
It is found to be effective when it is within the range of 5% by weight. Examples 24 to 31 show that the concentration is effective when T0P is in the range of 0.5 to 25% by weight.

When these results are put together, the content of the phosphoric acid compound for which an effect is recognized is 0.3 to 25% by weight, preferably 0.5 to 25% by weight, more preferably 1 to 25% by weight. It turns out that it is 25 weight%.

From the above results, the cleaning effect of the wet cassette cleaner can be maintained by adding the phosphoric acid compound to the cleaning liquid. This effect can also be achieved by wiping the head by directly penetrating the cleaning cloth instead of the cassette type.

In Examples, tricresyl phosphate (TCP), tributyl phosphate (TBP), triphenyl phosphate (TPP), and tridichloropropyl phosphate (CR
P) and tris (2-ethylhexyl) phosphate (TOP) have been described, but the present invention is not limited to these, and organophosphorus compounds whose effects can be easily estimated from their structural formulas, for example, triethyl phosphate (TEP), tri ( (Chloroethyl) phosphate (TCEP), tributoxyethyl phosphate (TBXP), tris (β-
Of course, chloropropyl) phosphate (TMCPP), octyldiphenylphosphate, tris (isopropylphenyl) phosphate, or cresyldiphenylphosphate (CDP) can be used.

Further, the present invention is not limited to the above-described embodiment, but can adopt various other configurations without departing from the gist of the present invention.

[0042]

As described above, according to the present invention,
By adding a phosphate compound to the cleaning solution,
The cleaning effect of the magnetic head is maintained, so that a long-term stable electromagnetic conversion characteristic can be obtained with a VTR or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cassette type cleaner.

[Explanation of symbols]

1 Cleaning liquid inlet, 2 cassette case (top), 3 cassette case (back), 4 reel, 5
Cleaning tape

Claims (28)

[Claims] An organic phosphoric acid compound (Chem. 1) is contained in a single solvent or a mixed solvent of water, alcohol, a fluorine-based inert organic solvent and other organic solvents. Cleaning liquid for a magnetic recording head. Embedded image Here, each substituent (R1, R2, R3) has 1 to 1 carbon atoms.
24 aliphatic alkyl groups, a halogen-containing alkyl group having 1 to 10 carbon atoms, an ether-containing substituent having 1 to 24 carbon atoms,
Or a substituent having a phenyl group or a benzene ring skeleton 2. The method according to claim 1, wherein the organic phosphoric acid compound is represented by the formula:
2. The cleaning liquid for a magnetic recording head according to claim 1, which contains 25% by weight. 3. The method according to claim 1, wherein the organic phosphoric acid compound is represented by the formula (1):
2. The cleaning liquid for a magnetic recording head according to claim 1, which contains 25% by weight. 4. The method according to claim 1, wherein the organic phosphoric acid compound (formula 1) is 1 to 25.
2. The cleaning liquid for a magnetic recording head according to claim 1, wherein the cleaning liquid is contained by weight%. 5. A tricresyl phosphate (TCP), a single solvent or a mixed solvent thereof among water, an alcohol, a fluorine-based inert organic solvent and other organic solvents.
Triethyl phosphate (TEP), tributyl phosphate (TBP), tris (2-ethylhexyl) phosphate (TOP), tri (chloroethyl) phosphate (TCEP), tridichloropropyl phosphate (CRP), tributoxyethyl phosphate (TBX)
P), tris (β-chloropropyl) phosphate (T
A cleaning liquid for a magnetic recording head, comprising: MCPP), triphenyl phosphate (TPP), octyl diphenyl phosphate, tris (isopropylphenyl) phosphate, or cresyl diphenyl phosphate (CDP). 6. Tricresyl phosphate (TCP), triethyl phosphate (TEP), tributyl phosphate (TBP), tris (2-ethylhexyl) phosphate (TOP), tri (chloroethyl) phosphate (T
CEP), tridichloropropyl phosphate (CR
P), tributoxyethyl phosphate (TBXP),
Tris (β-chloropropyl) phosphate (TMCP
6. The composition according to claim 5, which contains 0.3 to 25% by weight of P), triphenyl phosphate (TPP), octyl diphenyl phosphate, tris (isopropylphenyl) phosphate or cresyl diphenyl phosphate (CDP). Cleaning liquid for magnetic recording head. 7. Tricresyl phosphate (TCP), triethyl phosphate (TEP), tributyl phosphate (TBP), tris (2-ethylhexyl) phosphate (TOP), tri (chloroethyl) phosphate (T
CEP), tridichloropropyl phosphate (CR
P), tributoxyethyl phosphate (TBXP),
Tris (β-chloropropyl) phosphate (TMCP
6. The composition according to claim 5, wherein 0.5 to 25% by weight of P), triphenyl phosphate (TPP), octyl diphenyl phosphate, tris (isopropylphenyl) phosphate or cresyl diphenyl phosphate (CDP) is contained. Cleaning liquid for magnetic recording head. 8. Tricresyl phosphate (TCP), triethyl phosphate (TEP), tributyl phosphate (TBP), tris (2-ethylhexyl) phosphate (TOP), tri (chloroethyl) phosphate (T
CEP), tridichloropropyl phosphate (CR
P), tributoxyethyl phosphate (TBXP),
Tris (β-chloropropyl) phosphate (TMCP
The magnetic material according to claim 5, wherein the magnetic material contains 1 to 25% by weight of P), triphenyl phosphate (TPP), octyl diphenyl phosphate, tris (isopropylphenyl) phosphate, or cresyl diphenyl phosphate (CDP). Cleaning liquid for recording head. 9. A method in which tricresyl phosphate (TCP) is contained in a single solvent or a mixed solvent of water, alcohol, a fluorine-based inert organic solvent and other organic solvents. Cleaning liquid for magnetic recording head. 10. A tricresyl phosphate (TCP),
10. The composition according to claim 9, wherein the content is 0.3 to 25% by weight.
The cleaning liquid for a magnetic recording head according to the above. 11. A tricresyl phosphate (TCP),
10. The composition according to claim 9, wherein the content is 0.5 to 25% by weight.
The cleaning liquid for a magnetic recording head according to the above. 12. The method of claim 1, wherein tricresyl phosphate (TCP) is
10. The cleaning liquid for a magnetic recording head according to claim 9, wherein the cleaning liquid is contained in an amount of about 25% by weight. 13. Tributyl phosphate (TB) is added to water, an alcohol, a fluorine-based inert organic solvent or another organic solvent, a single solvent or a mixed solvent thereof.
A cleaning liquid for a magnetic recording head, comprising P). 14. Tributyl phosphate (TBP)
14. The cleaning liquid for a magnetic recording head according to claim 13, wherein the cleaning liquid is contained in an amount of 0.3 to 25% by weight. 15. Tributyl phosphate (TBP)
Is 0.5 to 25% by weight. 16. Tributyl phosphate (TBP)
Is 1 to 25% by weight.
3. The cleaning liquid for a magnetic recording head according to 3. 17. A method in which triphenyl phosphate (T) is added to a single solvent or a mixed solvent of water, alcohol, a fluorine-based inert organic solvent and other organic solvents.
A cleaning liquid for a magnetic recording head, comprising PP). 18. Triphenyl phosphate (TPP)
Of 0.3 to 25% by weight of the cleaning liquid for a magnetic recording head according to claim 17. 19. Triphenyl phosphate (TPP)
Of 0.5 to 25% by weight of the cleaning liquid for a magnetic recording head according to claim 17. 20. Triphenyl phosphate (TPP)
Is 1 to 25% by weight.
7. The cleaning liquid for a magnetic recording head according to 7. 21. Tridichloropropyl phosphate (CRP) is contained in a single solvent or a mixed solvent of water, alcohol, a fluorine-based inert organic solvent and other organic solvents. Cleaning liquid for magnetic recording head. 22. The cleaning liquid for a magnetic recording head according to claim 21, comprising 0.3 to 25% by weight of tridichloropropyl phosphate (CRP). 23. The cleaning liquid for a magnetic recording head according to claim 21, comprising 0.5 to 25% by weight of tridichloropropyl phosphate (CRP). 24. The cleaning liquid for a magnetic recording head according to claim 21, comprising 1 to 25% by weight of tridichloropropyl phosphate (CRP). 25. Tris (2-ethylhexyl) in water or a single solvent or a mixed solvent of alcohol, a fluorine-based inert organic solvent and other organic solvents.
A cleaning liquid for a magnetic recording head, comprising a phosphate (TOP). 26. The cleaning liquid for a magnetic recording head according to claim 25, which contains 0.3 to 25% by weight of tris (2-ethylhexyl) phosphate (TOP). 27. The cleaning liquid for a magnetic recording head according to claim 25, comprising 0.5 to 25% by weight of tris (2-ethylhexyl) phosphate (TOP). 28. The cleaning liquid for a magnetic recording head according to claim 25, comprising 1 to 25% by weight of tris (2-ethylhexyl) phosphate (TOP).