JP3267853B2 - Water-soluble lubricant composition and method for preventing metal corrosion - 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 lubricant composition and a method for preventing metal corrosion. More specifically, the present invention is excellent in corrosion resistance, rot resistance and microbial deterioration resistance to non-ferrous metals such as aluminum alloys. The present invention relates to a water-soluble lubricant composition and a method for preventing corrosion of an aluminum alloy using the composition. INDUSTRIAL APPLICABILITY The present invention is used for cutting, grinding, plastic working, and the like of non-ferrous metals such as aluminum, aluminum alloys, magnesium, and magnesium alloys and other metal materials.

[0002]

2. Description of the Related Art Phosphoric acid esters, amide compounds and the like are known as compounds that suppress corrosion of non-ferrous metals such as aluminum alloys.

[0003]

However, when these compounds are applied to a water-soluble lubricant, the anticorrosion effect is small. Further, in water-soluble lubricants used for cutting, grinding, etc., they are generally used as a water diluent, but the pH of the liquid is generally on the alkaline side, and when the pH is 9 or more, non-ferrous metals such as aluminum alloys are used. Corrosion occurs. As a result, a pH of 9
It must be kept below, and the rot resistance and the rust resistance are reduced. Further, a water-soluble lubricant containing phosphorus such as a phosphate ester has a problem that deterioration by microorganisms is rapid.
Therefore, a water-soluble lubricant composition having excellent corrosion resistance to non-ferrous metals such as aluminum alloys, and excellent rot resistance and microbial degradation resistance has not been found yet.

An object of the present invention is to solve the above problems and to provide a water-soluble lubricant composition having excellent corrosion resistance, rot resistance and microbial deterioration resistance to nonferrous metals such as aluminum alloys. .

[0005]

Means for Solving the Problems The inventors of the present invention have intensively searched for compounds that have an effect on corrosion resistance, rot resistance and microbial deterioration resistance against non-ferrous metals, and as a result, have found that specific silane compounds have excellent performance. And completed the present invention. That is, the water-soluble lubricant composition of the present invention has the general formula
X _n Y _m Si (OR) _4-nm It is characterized by containing a silane compound represented by (I). Where X _n
Integer of the n 0-3, m of Y _m is an integer of 0 to 3, and, 0 ≦ n + m ≦ 3 , X is an amino group, an aminoalkyl group, a group having an epoxy ring, an alkylene group, phenyl group, or Y is C _n H _{2n + 1} , n is an integer of 1 to 4, R is C _n H _{2n + 1} , and n is an integer of 1 to 4. )

[0006] As the amino group, in addition to the amino group, alkanol amino group (ethanol amino group, propanol amino group), it may be an alkyl amino group or the like. As the aminoalkyl group, an aminoethyl group,
An aminopropyl group, an aminobutyl group, an aminopentyl group and the like can be used. Examples of the group having an epoxy ring include an epoxy group and a glycidyl group.
Examples of the alkylene group include a vinyl group, an alkylvinyl group, a vinylalkyl group, and a butylene group. Examples of the alkylphenyl group include a methylphenyl group, a dimethylphenyl group, an ethylphenyl group, and a diethylphenyl group.

As the silane compound, γ- (2-
Aminoethyl) aminopropyltrimethoxysilane, γ
-(2-aminoethyl) aminopropylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, methyltrimethoxysilane, vinyltrimethoxysilane, N-β- (N-vinylbenzylaminoethyl)-
γ-aminopropylmethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, phenyltriethoxysilane, tetramethylsilicate, tetraethylsilicate and the like can be mentioned.

[0008] Another water-soluble lubricant composition of the present invention is a water-soluble lubricant composition containing the silane compound, an oil agent, an alkanolamine and water. When the amount is 100 parts by weight, the silane compound is 0.2 to 10 parts by weight (preferably 0.2 to 10 parts by weight).
5 parts by weight, more preferably 0.2 to 3 parts by weight, oily agent 20 to 90 parts by weight (preferably 20 to 70 parts by weight, more preferably 20 to 50 parts by weight, even more preferably 2 to 90 parts by weight).
0 to 40 parts by weight) and 3 to 30 parts by weight of alkanolamine (preferably 3 to 20 parts by weight, more preferably 3 to 30 parts by weight).
15 parts by weight). When the amount of the silane compound is 0.2 parts by weight, the effect is insufficient, and
If it exceeds 0 parts by weight, it becomes expensive. On the other hand, if this oily agent is less than 20 parts by weight, lubricity becomes insufficient, and
If the amount exceeds 0 parts by weight, the diluent becomes unstable.
Further, if the alkanolamine is less than 3 parts by weight, rot resistance is insufficient, and if it exceeds 30 parts by weight, skin irritation becomes strong.

[0009] The oily agent includes (1) capric acid,
Fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, oleic acid, erucic acid, linoleic acid, linolenic acid, ricinoleic acid, and eleostearic acid; (2) sesame oil and rapeseed oil , Nuka oil, cottonseed oil, pork oil, tallow, sheep and other esters, (3)
Higher alcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol and the like can be mentioned. In addition, as an oily agent, in addition to higher fatty acids, 2 to 5 parts by weight of a middle fatty acid of about dodecanedioic acid and capric acid is blended.

[0010] The composition may further comprise a base oil, a rust inhibitor, a surfactant, a preservative, an antifoaming agent, and other additives (eg, extreme pressure additives, anticorrosives, viscosity index improvers, An antioxidant, a detergent / dispersant, a coloring agent, a fragrance, etc.) can be appropriately blended and used. As the base oil, mineral oil, for example, machine oil,
Examples include turbine oil, spindle oil, and cylinder oil. As a water-soluble lubricant composition containing a base oil,
When the total amount of the water-soluble lubricant is 100 parts by weight, the silane compound is 0.2 to 10 parts by weight (preferably 0.2 to 10 parts by weight).
To 5 parts by weight, more preferably 0.2 to 3 parts by weight, and the oil agent is 20 to 70 parts by weight (preferably 20 to 50 parts by weight,
More preferably 20 to 35 parts by weight, alkanolamine is 3 to 30 parts by weight (preferably 3 to 20 parts by weight, still more preferably 3 to 15 parts by weight), and base oil is 15 to 70 parts by weight (preferably 20 to 35 parts by weight). 60 parts by weight, more preferably 20 to
50 parts by weight) and the balance can be water.

Examples of the rust preventive include, in addition to the above amine compounds, (1) carboxylic acids (lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid,
Behenic acid, naphthenic acid, alkenyl succinic acid, etc.),
(2) Carboxylates (metals of carboxylic acids such as fatty acids, naphthenic acids, abietic acids, lanolin fatty acids, alkenyl succinic acids, amino acid derivatives (Ca, Mg, Al, Z
n, Pb, etc.) salts, the above carboxylic acids and amines (ordinary monoamines, polyamines, rosinamines, tallowamines, etc.)
), (3) sulfonic acid salts (salts of petroleum sulfonic acid, dinonylnaphthalene sulfonic acid, heavy alkylbenzene sulfonic acid, etc. and Na, Ca, Ba, etc.), and (4) esters (oleic acid, lauric acid, etc.) Carboxylic acid and sorbitol
Pentaerythritol, sucrose, partial esters of polyhydric alcohols such as glycerin) and the like.

As the above-mentioned surfactant, a nonionic, anionic, cationic or amphoteric surfactant can be used, but a nonionic surfactant is preferable. This is due to the stability and detergency of the diluent. Nonionic surfactants include (1) polyoxyethylene compounds (polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl naphthyl ether, polyoxyethylenated castor oil, Polyoxyethylene abiethyl alcohol, polyoxyethylene alkylthioether, polyoxyethylene alkylamide, polyoxyethylene-polyoxypropylene glycol, polyoxyethylene-polyoxypropylene glycol ethylenediamine, polyoxyethylene mono Fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene sorbitan monofatty acid ester, polyoxyethylene sorbitan difatty acid ester Polyoxyethylene sorbitan tri-fatty acid esters, etc.), (2) a polyhydric alcohol - Le compounds and Arukiro - Ruamido compound (ethylene glycol - mono fatty acid esters, propylene glycol - mono fatty acid esters,
Glycerin monofatty acid ester, pentaerythritol monofatty acid ester, sorbitan monofatty acid ester, sorbitan sesquifatty acid ester, sorbitan trifatty acid ester, sucrose fatty acid ester, fatty acid monoethano-
Amide, fatty acid diethanolamide, etc.).

The anionic surfactants include:
(1) fatty acid derivatives (fatty acid soap, rosin acid soap,
Naphthenic acid soap, fatty acid sarcoside, proteolytic fatty acid amide, etc.), (2) sulfate-based compounds (long-chain alcohol sulfate, olefin sulfate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl ether sulfate, fatty acid polysaccharide) Trivalent alcohol sulfates), (3)
Sulfonic acid compounds and phosphate ester compounds (alkane sulfonate, petroleum sulfonate, α-olefin sulfonate, alkyl naphthalene sulfonate, alkyl phosphate ester salt, polyoxyethylene alkylphenol ether phosphate Ester salts).
The nonionic and anionic surfactants can be used in combination. Further, known cationic surfactants and amphoteric surfactants can also be used.

Examples of the above preservatives include (1) phenolic compounds (o-phenylphenol, Na-o-phenylphenol, 2,3,4,6-tetrachlorophenol, etc.), (2) ) Formaldehyde donor compound (2-hydroxymethyl-2-nitro-1,3-propanedio-
, Hexahydro-1,3,5-tris (2-hydroxyethyl)-(s) -triazine, etc.) (3) Others (such as a mixture of tribromosalicylanilide and dibromosalicylanilide).

Examples of the defoaming agent include silicone emulsions and higher alcohols. The method for preventing metal corrosion of the present invention comprises diluting a water-soluble lubricant composition containing a silane compound represented by the general formula (I) shown in the above water-soluble lubricant composition with water and adjusting the pH to an alkaline side. A metal material made of aluminum or an aluminum alloy is processed or immersed using the water-diluted alkaline solution shown below. As this water-soluble lubricant composition,
It contains a silane compound, an oil agent, an alkanolamine and water, and when the whole water-soluble lubricant is 100 parts by weight, the silane compound is 0.2 to 10 parts by weight, and the oil agent is 20 to 90 parts by weight. Parts and alkanolamine are 3 to 3
What is 0 parts by weight can be used. Further, the pH of the alkaline solution diluted with water is 8 to 10 (preferably pH 8).
To about 9.5).

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the water-soluble lubricant composition of the present invention will be described more specifically with reference to Examples and Comparative Examples. (1) Composition of Water-Soluble Lubricant Composition In order to clarify the performance of the water-soluble lubricant for metal working of the present invention, Examples 1 to 3 having the components shown in Tables 1 and 2 were used.
For the sample liquids according to No. 13 and Comparative Example 1, performance tests and evaluations of each item described below were performed. In Tables 1 and 2, spindle oil was used as a base oil, polyoxyethylene alkyl ether as a nonionic surfactant was used as a surfactant, and a silicone antifoaming agent was used as an antifoaming agent.

[0017]

[Table 1]

[0018]

[Table 2]

(2) Performance Evaluation The test items and the performance evaluation method of this performance test are as follows. Corrosion protection In this performance test, aluminum and aluminum alloy 2
A test piece (JIS Al050P, 50 × 30 × 1 mm) of duralumin (Cu4%, Mg0.5%) of No. 017 was polished with # 320 abrasive paper, and sulfuric acid was added to a 20-fold diluted solution of water of the sample solution. After adjusting the pH of the diluent to 9.0, it was half-immersed at room temperature, and the degree of discoloration of the test piece after 24 hours was visually evaluated. In the evaluation, ◎: no discoloration, ：: slightly discolored, ×: discolored black. Table 3 shows the results.

[0020]

[Table 3]

According to the results shown in Table 3, with respect to aluminum and duralumin, the anticorrosion properties are excellent in each example, but are inferior in each comparative example.

In this performance test, rot resistance was evaluated by measuring the number of viable bacteria. First, the sample solution was diluted 20 times with water, and 500 m
300 ml was collected in a 1-liter conical flask. Next, sulfuric acid was added to the mixture to adjust the pH of the diluent to 9.0, and then a decay solution having a viable cell count of 1 × 10 ⁷ cells / ml was added to 5% (15%).
ml) and shake-cultured at 30 ° C. Further, on the 7th and 14th days after the start of the test, the decay solution was added at 1% each (3 m).
l) was added, and the time-dependent change in the viable cell count was observed. Table 4 shows the results. The viable cell count was measured by a plate count method.

[0023]

[Table 4]

According to the results shown in Table 4, in each of the examples, there was no significant increase in the number of viable bacteria, and the rot resistance was equal to or higher than that of the comparative example.

[0025] In耐微biodeterioration resistance present performance test, the measurement of the friction coefficient by Zeng field pendulum type oily tester was evaluated lubricity before and after the microbial deterioration test. First, the sample solution was diluted 20 times with water. Next, sulfuric acid was added thereto to adjust the pH of the diluent to 9.0.
Then, put the decay solution with 1 × 10 ⁷ viable cells / ml into 1
% By weight, and cultivated with shaking at 30 ° C. for one month to promote the microbial deterioration, and then evaluated the lubricity. Table 5 shows the results.

[0026]

[Table 5]

According to the results shown in Table 5, in each of the examples, the coefficient of friction after microbial degradation did not change from that before degradation, excellent lubricity was maintained, and excellent resistance to microbial degradation. You can see that. On the other hand, in each of the comparative examples, the performance before the deterioration is almost the same as that in each of the examples, but after the deterioration, the friction coefficient is largely increased, and the performance as a lubricant is clearly reduced. As described above, in each of the examples, a composition having all excellent performances and a very good performance balance is shown.

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 depending on the purpose and application. In the above example, the pH of the water-diluted alkaline solution was adjusted to 9 by using sulfuric acid. However, when the pH of the composition of Example 1 was adjusted to 10 and the immersion test was similarly performed,
Similar results were shown. Further, if the composition itself shows an alkali side, it is not necessary to adjust the alkali side, and the type of the adjusting agent for adjusting the alkali (such as hydrochloric acid other than sulfuric acid, or the water diluent is acidic or low alkali side). The sodium carbonate, sodium hydrogen carbonate, caustic soda, etc. used in this case are not particularly limited.

[0029]

The water-soluble lubricant composition of the present invention has excellent corrosion resistance, rot resistance and microbial deterioration resistance to non-ferrous metals such as aluminum alloys, and has a very good balance of performance. ADVANTAGE OF THE INVENTION According to the metal corrosion method of this invention, the corrosion in the case of processing with an alkaline solution which aluminum alloy etc. easily corrodes can be prevented easily and efficiently.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10M 133: 08) C10M 133: 08) C10N 30:06 C10N 30:06 30:12 30:12 30:16 30:16 40: 20 40:20 Z (58) Fields investigated (Int.Cl. ⁷ , DB name) C10M 173/00-173/02 C10M 129/06 C10M 129/26-129/64 C10M 129/70 C10M 133/08 C10M 139/02-139/04 C10N 30:06 C10N 30:12 C10N 30:16 C10N 40:20 C23C 22/66

Claims (5)

(57) [Claims] 1. A water-soluble lubricant composition comprising a silane compound represented by the following general formula (I). _{X n Y m Si (OR)} 4-nm (I) ( where n is an integer 0-3 X _n in the formula, the m of Y _m 0
An integer of 0 to 3 and 0 ≦ n + m ≦ 3, X is an amino group,
An aminoalkyl group, a group having an epoxy ring, an alkylene group, a phenyl group or an alkylphenyl group;
_n H _{2n + 1} , n is an integer of 1 to 4, R is C _n H _{2n + 1} , n
Is an integer of 1 to 4. ) 2. A water-soluble lubricant composition comprising the silane compound according to claim 1, an oil agent, an alkanolamine and water, wherein the total amount of the water-soluble lubricant is 100 parts by weight. 0.2 to 10 parts by weight of the silane compound and 20 of the oil agent
A water-soluble lubricant composition characterized in that the amount of the alkanolamine is 3 to 30 parts by weight. 3. A water-diluted alkaline solution containing a silane compound represented by the following general formula (I), diluted with water and having a pH of an alkaline side. A method for preventing metal corrosion, comprising processing or dipping a metal material made of aluminum or an aluminum alloy. _{X n Y m Si (OR)} 4-nm (I) ( where n is an integer 0-3 X _n in the formula, the m of Y _m 0
An integer of 0 to 3 and 0 ≦ n + m ≦ 3, X is an amino group,
An aminoalkyl group, a group having an epoxy ring, an alkylene group, a phenyl group or an alkylphenyl group;
_n H _{2n + 1} , n is an integer of 1 to 4, R is C _n H _{2n + 1} , n
Is an integer of 1 to 4. ) 4. The water-soluble lubricant composition according to claim 3, comprising a silane compound, an oil agent, an alkanolamine and water, wherein the water-soluble lubricant is 100 parts by weight. 0.2 to 10 parts by weight of the silane compound,
20 to 90 parts by weight of oil agent and 3 parts of alkanolamine
The method according to claim 3, wherein the amount is from 30 to 30 parts by weight. 5. The pH of the alkaline solution diluted with water is 8 to 10.
The method for preventing metal corrosion according to claim 3 or 4, wherein