JPS59170277A - Oil soluble corrosion inhibitor for metal - Google Patents

Abstract

PURPOSE:To improve the corrosion resistance of metal at high temp. by adding benzotriazole or 3,5-dialkyldithiothiadiazole and a compound represented by a specified formula to lubricating oil or the like. CONSTITUTION:The titled inhibitor contains one or more kinds of benzotriazoles or 4-18C 3,5-dialkyldithiothiadiazoles and one or more kinds of compounds represented by a general formula (R-COO)nR' or (R-COOCH2)4C as effective components. In the formula, R is 3,5-di-t-butyl-4-hydroxyphenylethylene, R' is 1-22C hydrocarbon, 4-18C alkylene glycol, t-butylphenyl or di-t-butylphenyl, and n is 1 or 2.

Description

[Detailed description of the invention] The present invention relates to oil-soluble metal corrosion inhibitors.

For more details, benzotriazoles or banma.

One or more 3,5-dialkyldithioφthiadiazoles having 4 to 18 carbon atoms, and the general formula;
(R-COO),, R', or (R-coocu
2) 4c.

(Here, R represents a 3.5-di-t-butyl-4-hydrogynphenyl group and a 3.5-t-phthyl-4-hydroxy-phenylethylene group, and R is 01-22
Noalkyl &, 04-18 realgylene glycol, t
-butyl-phenyl group, di-t-butyl-phenyl group, and n represents 1 and 2. This invention relates to an oil-soluble metal corrosion inhibitor comprising as an active ingredient one or more of the hindered ferroyl compounds represented by the following formulas. Conventionally, motor oil, gear oil, hydraulic oil, etc. have been treated with antioxidants, pour point depressants, and viscosity index improvers to improve oil properties and enable long-term use.

Appropriate amounts of additives such as cleaning dispersants, extreme pressure agents, and rust preventive agents are added. Many of these additives are inert to metals, but compounds such as extreme pressure agents and antioxidants may contain substances that corrode metals. In order to stop this IIU, fatty acids and Ami-7.

) Marids, sulfonic acids, etc. were added.

Although these anticorrosives effectively protect metals at temperatures below 120'(120'), their anticorrosion effect decreases at temperatures above that. There is a need to suppress metal corrosion even at high temperatures of ~200''C or higher, and the development of heat-resistant metal corrosion inhibitors has been desired.

The present inventor has conducted various studies on metal corrosion inhibitors with excellent heat resistance, and has finally completed the present invention.

Alkyl ester of ff1l, 3,5-not-butyl-4-hydroquine-phenylbrobioite.

Alternatively, it was discovered that hinoku-1' phenol derivatives such as alkyl-substituted phenyl esters of 35-di-t-butyl-4-hydroquine-henosoate have good oil solubility and thermal stability. It has been discovered that when used together with triazoles and deanoazoles, it has excellent corrosion protection effects on metals, particularly copper+copper alloys, aluminum, and tin.

Among lubricant additives such as extreme pressure agents and antioxidants.

Examples of substances that corrode at high temperatures include metal dithiophosphates. Dithiophosphate metal salt]00~l 20
Although it is relatively stable at temperatures above 1000 C, it gradually thermally decomposes, releasing sulfur and forming metal sulfides, which causes corrosion.

It is believed that the metal corrosion inhibitor according to the present invention not only prevents the formation of metal sulfides caused by metal dithiophosphates, but also prevents thermal decomposition of metal dithiophosphates, and the oil after heat treatment is There is little discoloration and no sludge formation.

benzotriazoles and thiasiasoles.

It is used as an anti-corrosion agent in commercial applications. These compounds alone have an anticorrosion effect only up to a temperature of about 120° C., and cannot prevent the formation of metal sulfide by metal dithiophosphate at temperatures higher than that.

These compounds and alkyl esters of 3,5-di-t-butyl-4-hydroquine-phenylbrobimenate, or alkyl-substituted phenyl esters of 3,5-di-t-butyl-4-human rJ kimpetzeate. It is the first object of the present invention to use Hinkud 7er/-el derivatives such as Mir. It is possible to prevent metal corrosion at high temperatures of 150-2 oo'c.

The bindard heptanols derivatives according to the present invention are themselves stable against heat and are effective as stabilizers for polymeric compounds and the like. In the present invention, it is essential that the hindered phenol derivative suppresses thermal decomposition and oxidative deterioration of metal dithiophosphate salts and does not release sulfur, which is a corrosion factor, in order to prevent corrosion of metals such as copper. It can be inferred that it is wheat. At the same time, it is also expected to prevent the decomposition of benzotriazole and thiadiazole due to heat and oxidation, and it is thought that it also prevents the decomposition of the protective chelate film that has been applied to the metal surface, increasing its anticorrosion effect. . The combination ratio of both compound groups is
Benzotriazoles or di-alkyldithio・
Thiadiazole Irt 1 to 2 parts by weight of the phenol derivative according to the present invention per 100 parts of pure water
000 parts by weight, preferably benzotriazoles or di-alkyldithio-thiadiazoles 1
The amount of the hindered phenol derivative according to the present invention ranges from 10 parts by weight to 500 parts by weight.

Combinations other than these combinations cannot completely prevent metal corrosion caused by dithiophosphate metal salts.

The benzotriazoles according to the present invention include:

Benzotriazole, methylbenzotriazole.

Examples include chlorobenzotriazole, ethylbenzotriazole, naphthotriazole, and the like.

35-di-alkyldithio cyanoazoles include 3
5-di-butyldithio thiadiazole.

3,5-t-hequinardithio thiadiazole, 35
Examples include -di-octyldithio thiadiazole, '3,5-dilauryldithio thiadiazole, and 3,5-dioleyldithio thiadiazole.

Examples of the hindered phenol derivatives according to the present invention include (3,5-di-4t-butyl-4-hydroxy-phenyl)propio/methyl acid, (3,5-di-t-butyl-4- Hydroquine-phenylated) butyl propionate, (3,5-di-t-butyl-4-hydroquine-phenyl)octyl propionate, (3,5-di-
tert-butyl-4-hydroxy-phenyl)propionate, (3,5-di-t-butyl-4-hydroxy-phenyl)propionate benzyl bis
3-5-di-t-butyl-4-hydroquine-phenyl)
brJ Hyonic acid] octanodiol ester, Tetrakis [methyleneno-5-(3',5'-di-butyl-4-hydroquine-phenyl)propimenic acid] methane,
Examples include 24-di-t-butyl-phenyl-3'5-di-t-butyl-4-hydroquino-benzoate.

The gold m corrosion inhibitor according to the present invention is a conventionally used corrosion inhibitor. Fatty acid salts, amines.

It can be used in combination with amides and sulfonates for a more complete effect.

Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.

Example 1 Each of the products of the present invention shown in Table 1 was added to a mixture of 99 parts of T+30 engine oil and 1 part of zinc-di-butyl-dithiophosphoric acid, uniformly dissolved, and then degreased. and aluminum specimens immersed in 195 soil 5”C
It was heated for 5 hours. After heating, the degree of discoloration of the test piece was determined by degreasing and washing, and weight measurement was performed to measure the change in weight.

As is clear from the above results, it was found that the product of the present invention has an excellent anticorrosion effect on steel and aluminum.

Example 2 Molybdenum was added to 98.8 parts of lOO neutral oil.
Each of the products of the present invention shown in Table 2 was further added to a mixture of 0.7 parts of diothyldithiophosphoric acid and 05 parts of sulfurized whale oil, and after uniformly dissolving, the degreased copper and tin plated test pieces were immersed. , 195±5"C for 3 hours. After the test, the degree of discoloration of the test piece and the weight after degreasing and cleaning were measured.
Changes in fc amount were measured.

Table 2 As is clear from the above results, the product of the present invention was found to have an excellent anticorrosive effect on copper and tin plating.

Patent Applicant Chiyoda Chemical Research Institute Co., Ltd., Kazuo Wakasugi, Commissioner of the 11th Office 1, “Indication of IS Patent Application No. 0438 of 1982”
No. 18 2 Title of the invention Oil-soluble metal corrosion inhibitor 3,
11n Relationship with the case of the person making the correction Patent applicant 11-3 4. Date of amendment order Voluntary 5. Subject of amendment Specification 6. Contents of hli correction As shown in the attached sheet.

Contents of the amendment Specification (1) 6th line from the top of page It says "3,5-di-argyldithio".

Corrected to "2,5-di-alkyldithio".

a. The scope of the claims is as follows.

(1) Benzotriazoles or carbon number 4
to 18 2,5-di-alkyldithio-thiadiazoles and the general formula; represents a pyroxyphenyl group and a 3,5-di-t-butyl-4-hydroxy-phenylethylene group, and R has 1 carbon number.
to 22 hydrocarbon groups, alkylene glycols having 4 to 18 carbon atoms.

It represents a t-butylphenyl group and a di-t-butylphenyl group, and rL represents 1 and 2. ) An oil-soluble metal corrosion inhibitor comprising one or more of the compounds represented by the following as an active ingredient.

Pages (6) and (9) of the specification, QΦ page, Oα page, and α desired page are replaced.

The amount of the hindered phenol derivative according to the present invention ranges from 1 part by weight to 2000 parts by weight, preferably 1 part by weight per 100 parts by weight of the benzotriazole or di-alkyldithio-thiadiazole. The hindered phenol derivative according to the present invention ranges from 10 parts by weight to 500 parts by weight. Combinations other than these ratios cannot completely prevent corrosion of metals caused by dithi-like metal phosphates.

The benzotriazoles according to the present invention include:

benzo) riazole, methylbenzotriazole.

Chlorobenzotriazole, ethylbenzotriazole, naphthotriazole, etc. can be used.

2,5-)-Alkyldithio thiadiazoles include:
2.5-Di-butyldithio thiadiazole.

2, 5-t-hexyldithio′Φthiadiazole, 2
．． 5-Dioctyldithia Thiadiazole, 2.5-
Di-Lauryldithio Thiadiazole, 2.5-Di-
As is clear from the above results, it was found that the product of the present invention has an excellent anticorrosion effect on steel and aluminum.

Example 2 Molybdenum was added to the town OO neutral 1th98.8 part.
Each of the products of the present invention shown in Table 2 was further added to a mixture of 0.7 parts of dimethylnotiophosphoric acid and 5 parts of sulfurized whale oil Q, and after uniformly dissolving, the degreased copper and tincture specimens were mixed. It was immersed and heated at 195±5°C for 3 hours. The degree of discoloration of the test piece and the change in weight after degreasing and cleaning were performed and the change in weight was measured.

Table 2 As is clear from the above results, the product of the present invention was found to have an excellent anticorrosive effect on copper and tin plating.

Patent Applicant Chiyoda Chemical Laboratory Co., Ltd. Procedural Amendment S (Method) 1. Indication of Case Patent Application No. 1983. No. 43818a Title of the invention Oil-soluble metal corrosion inhibitor 3 Relationship with the case of the person making the amendment Patent applicant 11-3 4. Date of the amendment order Details of the voluntary amendment! ; Page 12, bottom line [8, I found out.

'', the following examples are added.

Example 3 Each of the products of the present invention shown in Table 3 was added to an oil prepared by mixing 97 parts of #30 machine oil with 3 parts of ZI-T-1-L and polysulfide (sulfur content 38%) and uniformly dissolved. ,100℃
It was heated for 30 days.

A polished copper test piece was immersed in this heat-degraded sample oil, heated at 150±3'C for 3 hours, and the degree of discoloration of the copper plate was observed.

Judgment was made in accordance with JIS K2513 standard for discolored skin surface.

Table 3 It was found to be effective.

that's all patent applicant Chiyoda Chemical Research Institute Co., Ltd. 391-

Claims (1)

[Claims] (1) Benzotriazoles or carbon number 4
to 18 3.5-di-alkyldithio-thiacyazoles and the general formula; group, and 35-di-7-butyl-4-hydroxyphenylethylene group, R is a hydrocarbon group having 1 to 22 carbon atoms, and alkylene glycols having 4 to 18 carbon atoms. -t-butylphenyl group, n represents 1 and 2)
An oil-soluble metal corrosion inhibitor comprising one or more species as an active ingredient.