JP2923410B2 - Water-soluble cleaning and rust inhibitor composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble cleaning and rust preventive composition, and more particularly to a cleaning and rust preventing agent capable of simultaneously cleaning and rust-proofing a heat-treated automobile metal part. Composition.

[0002]

2. Description of the Related Art Generally, heat-treating oil, scale, and the like are attached to metal parts for automobiles after heat treatment such as quenching and tempering. When heat treatment oil is not used, dew condensation water adheres to the surface of the metal component in addition to the scale. These deposits may cause operational problems or impair the quality of metal parts.
For example, if the heat treatment oil adheres to the metal parts, the metal parts or the metal part and the transport roll may become sticky and cannot be transported, may cause problems such as reduced processing accuracy due to scale adhesion, and rust generation due to moisture adhesion. easy. In order to eliminate the above-mentioned problems, conventionally, heat-treated automotive metal parts have been used as rust preventives for intermediate processes.
A solvent-diluted rust-preventive oil standardized to ISK2246 was applied, and the rust preventive and the scale were cleaned using an organic solvent-based cleaning agent before the assembling and processing steps of parts.

[0003]

However, in the above-mentioned rust preventive and the cleaning method, in order to prevent poor conveyance due to the stickiness of the oil film remaining on the metal part surface after the rust preventive is applied,
A cleaning process using an organic solvent is required, and workability is reduced.Since trichloroethane and chlorofluorocarbon are used as the organic solvent, equipment for disaster prevention, labor, and sanitation,
There are drawbacks in handling such as requiring measures. As described above, the fact is that a combination agent which has good workability, is easy to handle, and can simultaneously perform rust prevention and washing, and a method therefor have not been found yet.

[0004] The present invention has been made in view of the above point of view, and can perform washing and rust prevention simultaneously, exhibit excellent washing and rust prevention properties, and can also use an organic solvent (particularly, trichloroethane, chlorofluorocarbon, etc.). An object of the present invention is to provide a water-soluble cleaning and rust preventive composition which can eliminate the need for cleaning.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on the relationship between a composition component having both washing and rust prevention, and washing and rust prevention properties. The discovery of the composition led to the completion of the present invention. That is, the water-soluble cleaning and rust inhibitor composition of the present invention (hereinafter, referred to as
It is referred to as "composition". ) Is 100 parts by weight (hereinafter referred to as "parts") of the whole composition, and (a) carbon number 4
5 to 20 parts of at least one of a monocarboxylic acid having 12 to 12 carbon atoms and a dicarboxylic acid having 4 to 12 carbon atoms, 15 to 30 parts of (b) alkanolamine, and (c) a diamine represented by the above general formula (I). And 0.5 to 10 parts of water.

When the number of carbon atoms of the monocarboxylic acid and / or dicarboxylic acid in the present invention is from 4 to 12, the rust-preventing property is insufficient when the number of carbon atoms is 3 or less, and when the number of carbon atoms is 13 or more, the composition tends to be separated or foamed. This is because a trouble occurs during use. As the above "monocarboxylic acid", for example,
(1) Aliphatic acids such as pentanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid and 2-ethyl-hexanoic acid; (2) aromatic acids such as benzoic acid and butylbenzoic acid; be able to. Examples of the above-mentioned "dicarboxylic acid" include adipic acid, sebacic acid, dodecanedicarboxylic acid and the like. The reason why the content of the carboxylic acid is determined as described above is that if the content is less than 5 parts, the rust prevention property is insufficient, and if the content exceeds 20 parts, the composition is separated.

The "alkanolamine" in the present invention is a component which forms a salt with the above carboxylic acid and exerts a detergency, and includes monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and the like. Triisopropanolamine, N-ethylethanolamine, N-methyldiethanolamine, N-cyclohexyldiethanolamine and the like can be mentioned. Further, the content of the alkanolamine is determined as described above because the content is 1%.
If the amount is less than 5 parts, the composition is separated, and if the amount exceeds 30 parts, the viscosity of the composition becomes high and handling becomes inconvenient.

Further, in the present invention, the above-mentioned general formula (I)
The “diamine” represented by is a component having an action of improving a washing action and a rust prevention action by a salt of a carboxylic acid and an alkanolamine. The “R” as the N-substituent in the general formula (I) is a non-aromatic hydrocarbon group, and may be a chain type or an alicyclic type. As the hydrocarbon group, a saturated hydrocarbon group is usually used, but an unsaturated hydrocarbon group (for example, an oleyl group) may be used. Further, the number of carbon atoms of the “R” is determined as described above when the number of carbon atoms is 5 or less.
This is because there is no improvement effect of the cleaning action and the rust prevention action.
If the number is 9 or more, the composition is separated.
The number of “n” in the alkylene group is determined as described above because n
Is 2 to 4, the effect of improving the cleaning action and the rust prevention action is large.

The above "diamine" includes, for example, N-
Dodecyl propylene diamine, N-palmityl propylene diamine, N-cyclohexyl propylene diamine,
N-dodecylethylenediamine, N-palmitylethylenediamine, N-cyclohexylethylenediamine, N
-Dodecyl butylene diamine, N-palmityl butylene diamine, N-cyclohexyl butylene diamine and the like. Further, the content of this diamine is determined as described above. If the content is less than 0.5 part, the washing action and the rust-preventing action by the salt of carboxylic acid and alkanolamine cannot be improved. Is separated. The composition of the present invention is composed of the above essential components and water. As other optional components, conventionally used antioxidants, copper alloy anticorrosives, defoamers and the like may be appropriately added. Can also.

[0010]

The present invention will be specifically described below with reference to examples and comparative examples. In order to clarify the performance of the composition of the present invention, performance tests described below were performed on the compositions according to the examples shown in Table 1 and the comparative examples shown in Table 2. In the same table, Comparative Example 11 was a solvent-dilutable rust inhibitor “Non-Raster P311” (trade name, manufactured by Yushiro Chemical Industry Co., Ltd., JI
SK2246 (corresponding to three kinds, rust preventive film components composed of metallic soap, oxidized wax, sulfonate and mineral oil diluted with petroleum solvent) were used. Tables 1 and 2
Numerical values indicating the composition in indicate parts.

[0011]

[Table 1]

[0012]

[Table 2]

(1) Performance test Detergency A mixture of 80 parts of No. 68 turbine oil and 20 parts of 200-300 mesh chemical iron powder was used as "dirt" as a test piece (SPCC-SD, 1.2 mm × 60 mm × 80mm)
, And the washing rate (%) was measured when washing was performed under the following conditions. Cleaning liquid: 30-fold water dilution of the composition according to Examples and Comparative Examples Liquid temperature: 60 ° C. Cleaning method: A test piece was immersed in the cleaning liquid, and ultrasonic wave (2
8 kHz). Washing rate (%): [(weight of test piece coated with dirt-weight of test piece after cleaning) / (weight of test piece coated with dirt-weight of test piece before coating dirt)] × 100

Rust Prevention This performance test was carried out using the same test pieces and sample liquids as those used in the above "cleanability". That is, the test piece was immersed in each of the sample liquids described above, pulled up, suspended for 24 hours, and allowed to stand for 24 hours. Then, the state of rust generation after 10 days was examined in accordance with the storage and storage test method specified in JIS K2246. In the performance test, "◎" indicates "no rust" and "△" indicates "11 of the entire surface of the test piece."
Rust occurred on ~ 25% of the surfaces. And "x" indicate "26 to 50% of the entire surface of the test piece was rusted."

Non-adhesive Clean steel sheet washed with a solvent (SPCC-SD, 1.2 m
m × 60 mm × 80 mm) is fixed horizontally, and the test pieces after the cleaning test obtained in the above section on detergency are superimposed on each other, and then the test pieces are pulled horizontally and each test piece moves. The resistance at the time of doing was examined by the tactile sensation of the hand. still,
In the display of the evaluation in this performance test, “○” indicates “no resistance and the test piece moves smoothly.” “△” indicates “a little resistance and the test piece is slightly difficult to move. "And" x "indicate" a strong sense of resistance is felt and it is difficult to move the test piece. "

(2) Performance Test Results and Performance Evaluation Table 3 shows the results of the performance tests described above.

[0017]

[Table 3]

According to the performance tests described above, each of the compositions of Comparative Examples 1 to 6 containing no diamine (c) of the above general formula (I) and Comparative Example 7 having a small content has any required performance. Could not be satisfied. Further, Comparative Example 8 having a small content of monocarboxylic acid (a) and the like, and Comparative Example 9 using propionic acid (carbon number 3) as monocarboxylic acid (a) have insufficient rust prevention performance. Furthermore, Comparative Example 10 in which the content of the alkanolamine (b) was excessive and Comparative Example 11 in which the solvent-diluted rust preventive was used were compositions having high tackiness and inconvenient handling. The same composition as in Example 1 except that the content of N-dodecylpropylenediamine was 12 parts (excess) and the content of water was 61 parts, and the content of dodecanoic acid was 22 parts ( Excess) and the same composition as in Example 1 except that the content of water was 56 parts, except that myristic acid (monocarboxylic acid having 14 carbon atoms) was used instead of dodecanoic acid. Preparation of the same composition as in Example 1 was attempted, except that the content of triethanolamine was 12 parts (under) and the content of water was 79 parts, except that the content of water was 79 parts. In each case, the composition was separated, and the above performance tests could not be performed.

On the other hand, the composition according to the present embodiment (Example 1)
In Nos. To 9), all the required performances were satisfied, and it was shown to be an excellent composition.

(3) Test and evaluation by actual machine line In the actual machine line for assembling automotive parts (small engine parts; cotter, key, ball), the composition of the present invention (Example No. 6) and the conventional example were used. A practical test was performed. Then, the flow of parts (hereinafter referred to as “transport”) in the parts feeder and the straight-ahead feeder in the assembling actual machine line in each of the processes described below was examined for a defective rate (%) (about a part jam). Step A: Pretreatment → Heat treatment → Solvent-diluted rust preventive agent application → Centrifugal deoiling → Drying → Transport → Assembly (defective rate of transport; 50%) Step A ′: Pretreatment → Heat treatment → Solvent-diluted rust inhibitor Coating → centrifugal deoiling → washing → drying → transport → assembly (transport defect rate: 5%
Step B: Pretreatment → Heat Treatment → Example No. Cleaning and application of rust preventive agent 6 → centrifugal hot air drying → transportation → assembly (transportation failure rate;
(5% or less) In the above, as the solvent-dilutable rust preventive, trade name "VR10 (manufactured by Diamond Chemical Co., Ltd.)" (JIS K2246)
3 types) and trichloroethane was used in the washing step.

As described above, in the step A 'in which a conventional solvent-diluted rust inhibitor is applied and trichloroethane is washed,
Although excellent in the defective rate of transport, it requires two steps of rust prevention and cleaning, and requires cleaning with an organic solvent which is not preferable for sanitary and safety. In the step A in which the organic solvent cleaning is not performed,
The defective rate of conveyance is extremely large. On the other hand, in Example No. If the cleaning and rust preventive agent of No. 6 is used, rust prevention and cleaning can be performed at the same time, it is water-soluble, and the defective rate of conveyance is small. It should be noted that the present invention is not limited to the specific embodiments described above, but can be variously modified within the scope of the present invention according to the purpose and application.

[0022]

As described above, when the water-soluble cleaning and rust preventive composition of the present invention is used, the cleaning step with a solvent can be carried out in comparison with a conventional solvent-diluted rust preventive and a cleaning method with an organic solvent. Since it can be omitted and cleaning and rust prevention can be performed at the same time,
Work efficiency can be improved and the environment can be improved.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Taketake Kubo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Kazuaki Ueda 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (58) Field surveyed (Int.Cl. ⁶ , DB name) C23G 5/036

Claims (1)

(57) [Claims] 1. A water-soluble cleaning and rust preventive composition as a whole
Parts by weight, (a) 5 to 20 parts by weight of at least one of a monocarboxylic acid having 4 to 12 carbon atoms and a dicarboxylic acid having 4 to 12 carbon atoms, and (b) 1 part by weight of alkanolamine.
A water-soluble cleaning and rust preventive composition comprising 5 to 30 parts by weight, (c) 0.5 to 10 parts by weight of a diamine represented by the following general formula (I), and water. R (H) N (CH ₂ ) _n NH ₂ (I) (where R is a non-aromatic hydrocarbon group having 6 to 18 carbon atoms,
n shows the integer of 2-4. )