JPH05502262A - Low volatility solvent for active substances containing aromatic components - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Low volatility solvent for active substances containing aromatic components This invention relates to improvements in its use as a hydraulic fluid for power transmissions.

Hydraulic fluids are used in applications where oil may leak into the surrounding environment, e.g. through unavoidable leaks. When used, environmentally benign ester oils, especially rapeseed and/or soybean oil based Demand for hydraulic oil containing oil is increasing. A typical example of the kind of problem is , machinery and tools used in forestry and agriculture, excavators, etc. water ha Water Hazard C1 assignment is 0 The use of hydraulic fluids that are, in contrast to hydraulic fluids, based on corresponding esters The oil serves environmental protection purposes.

However, ester oils suitable for practical use, such as rapeseed oil with low viscosity and unsaturated fatty acids, Ester oils based on the However, the viscosity tends to increase rapidly. The cause of this is the oil in question here. The olefinic double bond of the acid forms esters of The downside is that it is easy to proceed to a reaction that ultimately leads to an increase in viscosity. principle This undesirable increase in the viscosity of the hydraulic oil is caused by the addition of antioxidants. J″〈A 6 degree can be prevented if tJ6 is ・1 is L′: tl, ra 0 ・Satisfaction 0 can be obtained It is difficult to maintain the effect to a certain extent, especially over a long period of time. 0"6.,:,:"rProblem 2 - 6 types of Om2To extend the working life of chill oil In the case of multi-oxidation, more antioxidants, corrosion inhibitors, etc. are added after a certain period of time. This is necessary.

Auxiliary agents such as antioxidants, corrosion inhibitors, etc. that require addition are often, but not always, In any case, it is a compound that contains at least partially aromatic components. undesirable ring Suitable auxiliaries or active substances to counteract the attack of ambient oxygen include, inter alia, phenolic compounds. A large number of synthetic and/or hydrochloric acid derivatives are found. For example, the applicant Previous patent application P3927155.2 [D8826 “Environment undry base oil for the formula of hydra Uritsuk Oils (Environment-friendly baseo) il for the [’ormulation of hydrolic 　oils)　] for the formulation of hydraulic oils, we offer corresponding natural products containing the following ingredients: Regarding base properties, it is reported that there is improvement in activity during use and/or low temperature stability. It is listed a) Refined rapeseed oil and/or soybean oil as oil-stopping ingredients b) Methoxyphenol, Ethoxyphenol, butylated hydroxyanine, butylated hydroxytoluene , methoxyhydrodecanopeethoxy/hydroxyne, tert-butylhydroquinone and / or an antioxidant selected from the group consisting of tocopherols to the entire mixture. 0. 5 to 5% by weight, and optionally C) trimethylolethane, trimethyl Polypropane and/or neopentyl glycol belonging to the following categories: Esters with carboxylic acids.

CI) saturated C5-tomo/carboxylic acids and/or C2) rapeseed oil, soybean oil and and/or industrial oleic acid-based fatty acids Ester component C) is present in substantially the same amount as oilstop component a).

Only antioxidants based on aromatic components are used as component b). these For practical use of mild base oils in such environments, stabilizers are preferably used at high a. It has been found that it is more desirable to produce a thick solution of the active substance in solution. There is. The life of hydraulic oil can be extended by adding these active substance concentrates later. can be effectively extended. However, there is some problem with the selection of solvent. the aforementioned species Thick liquids of active substances of type A have low volatility and are fluid at room temperature, depending on the active substance used. It has high compatibility with the aromatic basic structure of the active substance and can reliably dissolve the active substance at the required high concentration. Requires a suitable solvent. Solvents with a partially aromatic basic structure also satisfy this condition. It is. Based on these basic considerations, the currently widely used dibutyl Talate (DBP) is a typical solvent suitable for producing the required active substance concentrates. .

However, recently ecological and toxicological arguments against the unrestricted use of DBPs have emerged. It has been reported. This is the starting point of the invention.

The problem that the present invention seeks to solve is to provide an environmentally benign oil phase, e.g. oil phases of known types, such as the ester oils described in earlier patent applications filed by the same applicant. have an at least partially aromatic molecular structure and are environmentally compatible. The object of the present invention is to provide an auxiliary agent of the above-mentioned type, which is characterized as follows. In particular, the present invention , antioxidants and/or corrosion inhibitors of the types mentioned above can be added to the water themselves. Make it into a concentrated liquid dissolved in a solvent with a hazard index of 0, and at the same time at room temperature. Ester base oil that enables the production of highly fluid concentrated liquids without any special work. It consists of being safely miscible with pressure oil.

The problem to be solved by the present invention is to select a safe solvent with high environmental compatibility and low volatility. Technically solved by the use of zoic acid diesters.

The invention therefore provides environmentally compatible fats and/or oils, especially esters. When used in hydraulic oils based on low volatility rings for active substances such as antioxidants and/or corrosion inhibitors with At least four selected carbon atoms, which are fluid at room temperature, as environment-friendly solvents. Use of benzoic acid diesters of linear and/or branched aliphatic diols containing children Regarding.

In another embodiment, the present invention provides a method that is fluid at room temperature and contains at least 4 carbon atoms. benzoic acid diesters of linear and/or branched aliphatic diols containing Antibiotics having an at least partially aromatic basic structure characterized by the presence of Contains active substances such as oxidizing agents and/or corrosion inhibitors, and is free-flowing at room temperature. It relates to additives based on emissive solvents.

Preferred low volatility solvents according to the invention have pour points below 0°C, preferably -10°C. ℃ or less, and at the same time the flash point is not lower than 150℃, preferably 200℃ The above is a diester of benzoic acid/diol. Safety products with these characteristics Zozoic acid diesters are particularly characterized by 4 to 9 carbon atoms arranged in a linear chain between the hydroxyl groups of diols. Diols or esters containing elementary atoms, especially containing 5 to 7 carbon atoms ° Guide from the core part. This straight chain between diols may be unsubstituted or , also preferably substituted with lower alkyl groups containing up to 3 carbon atoms. Therefore, it may be branched one or more times. At most 10 carbon atoms in the 7-ol moiety Particularly suitable are benzoic acid diesters of diols, including.

The above types of benzoic acid diesters can be summarized as described at the beginning of the text. It satisfies the specified characteristic conditions. This type of ester has an aromatic molecular moiety, so Large amounts of aromatic active substances can be dissolved in the additive. Therefore, selected The setting of the active substance content in the solvent is usually from 5 to about 50% by weight, preferably about 40%. % by weight is also possible. Benzoic acid esters themselves are environmentally benign, especially when it comes to water. The tar hazard index is O. These are based on the ester oils mentioned above, for example. It can be easily introduced into hydraulic oil and can be mixed uniformly.

Preferred active substances to be introduced via the additive according to the invention are metquinphenol. , ethoxyphenol, butylated hydroxyanisole, butylated hydroxytolu Ene, methoxyhydroquinone, ethquinhydroquinone, tert-butylhydroquinone and/or an antioxidant selected from the group consisting of tocophenols. other texts Type active substances can also be added to the additive concentrate. Examples of these other additives are High pressure additives, anti-wear additives and/or pour point depressants.

Further information on the individual components of hydraulic fluids can be found in the relevant prior art literature, in particular Ullmanns E zyklop Mdie der technischen Chemi e)”, 4th edition [Verlag Chemie, V. Weinheim], Volume 13, page 85 et seq., Hydra Hydraulikflussigkeiten (Hydraulikflussigkeiten) ) and Dieter Klamann Measinide nohue rant fairvante prodoukci, Herster. Schmierstof fe und vervandteProdukte, Herstellung , Eigenschaften, Anwendung) Verlag Chemie, Weinhei m) Ko1982.147/148 p.-11.9, Hydr. aulik61e).

In one particular embodiment of the invention, the benzoic acid diester is a poly-alpha-olefin. Mixture with fin and use as solvent phase. In this context, poly-α- Olefins are oligomers of medium chain length α-olefins. benzoic acid geo Low polymers that meet the flowability requirements of diesters are particularly suitable. in monomer molecules Ctoα-olefin oligomers containing 6 to 12 carbon atoms are preferred; Particularly preferred are oligomers of olefins. Low polymers may also contain e.g. 2 to 6 α- Formed from olefins. Benzoic acid diester mixed with poly-α-olefin The ratio can be set over a wide range, and the appropriate quantitative ratio of the two components is about 95:5 to 5:95, preferably 70: 30-30: In the presence of 0.1% tin oxide, pentane- 856 g of 1,5-diol was treated with 1832 g of benzoic acid at 200'C for 7 hours. It became a tell. A colorless and transparent oil was obtained, and its characteristic values were as follows: Value 0. 3. Hydroxy value: 29, saponification value: 350° The flash point of this oil is according to German industrial standards. (DIN) According to ISO2595, 224℃, pour point is German Industrial Standard 15O3 According to the German Industrial Standard Is○3015, the cloud point is -33℃ according to 016. The temperature was 12°C.

Wataru Mushihiro Neopentyl glycol 159g, )limethylolpronone 136g and 366 g of zozoic acid was reacted and esterified in the same manner as in Example 1. A colorless oil is obtained. , crystallized after about 3 days.

Comparative example 2 183 g of benzoic acid and 76 g of propane-1,2-diol were added in the same manner as in Example 1. The mixture was reacted and esterified. A crystalline product was obtained.

Example 2 Add 30 g of butylhydroxyanisole to 70 g of the ester obtained in Example 1. Dissolved at 0°C. This mixture remains in a liquid state for more than 3 weeks at -10'C. was maintained.

Insect insect circle 342 g of anhydrotrimellidic acid, 323 g of octatool and 48 g of decanol 5 g was reacted and esterified in the same manner as in Example 1.

A colorless oil was obtained, the characteristic values of which were as follows. Acid value 0.5, hydroxyl value 2. Saponification value: 285° The pour point of this oil is according to German Industrial Standard I 5O3016. According to the German Industrial Standard 15O2595, the flash point is 280°C. there were.

Similarly to Example 2, 30 g of butylhydroxyanisole obtained in Comparative Example 3 was Dissolved in 70g of ester at 60"C. Butylhydroxyanisole was mixed. It was precipitated from the compound.

abstract Hydraulics based on environmentally compatible fats and/or oils, especially esters active substances having an at least partially aromatic basic structure when used in oils; As a low volatility environmentally compatible solvent, e.g. for antioxidants and/or corrosion inhibitors. straight-chain and at least 4 carbon atoms, which are fluid at room temperature, The use of benzoic acid diesters of branched aliphatic diols and/or branched aliphatic diols is disclosed.

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Claims (5)

[Claims] 1. Based on environmentally compatible fats and/or oils, especially esters Active substances with an at least partially aromatic basic structure when used in hydraulic fluids low volatility environmentally friendly solvents for substances such as antioxidants and/or corrosion inhibitors a selected linear chain having at least 4 carbon atoms, fluid at room temperature, as and/or the use of benzoic acid diesters of branched aliphatic diols. 2. The temperature of the benzoic acid/diol diester used is below 0°C, preferably -1 Pour point below 0°C and draw point not below 150°C, preferably above 200°C. A linear chain between both hydroxyl groups of the esterified diol, preferably 4 to 9, has a flash point. of carbon atoms, more preferably 5 to 7 carbon atoms, optionally preferably 3 substituted one or more times by a lower alkyl group containing up to 2. The use according to claim 1 as a sign. 3. The benzoic acid diester has an active substance content of preferably about 5-40% by weight. 1 or 2, characterized in that it is used for the production of particularly concentrated active substance solutions; Use as described in 2. 4. Benzoic acid diesters of diols containing at most 10 carbon atoms as solvents Use according to any one of claims 1 to 3, characterized in that it is used. 5. Mixing ratio of benzoic acid diester to poly-α-olefin: 95:5 to 5:9 5. According to any one of claims 1 to 4, the mixture is used as a mixture of Use of.