JP3495415B2 - Threading oil for water supply with excellent biodegradability - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil agent used for threading water pipes such as water pipes and joints. [0002] Threading of water pipes and the like is performed by using an oil agent to cut the pipe and then removing the oil agent attached with tap water or the like to minimize the effect on drinking water. In this regard, the Japan Water Works Association (JWWA) established the standard of "threading oil and sealant for water supply" in 1991 from the viewpoint of safety and hygiene. It specifies that an oil agent containing a system extreme pressure additive and a surfactant be used. [0003] In recent years, global environmental protection has been debated worldwide and has been studied in various fields. In the field of lubricating oils, there is increasing interest in the effect on the global environment. In the field of such lubricating oils, tapping oils for water supply are often used outdoors, causing soil contamination due to leakage of oils, water pollution by oils washed off during washing of pipes, etc., which may adversely affect ecosystems. There is. [0004] However, currently used oils use mineral oil as a base oil in terms of machinability, but such mineral oils are generally poor in biodegradability, and surfactants are also washed. Emphasis is placed on the compatibility with tubular oil and base oil, and no consideration has been given to protecting the global environment. SUMMARY OF THE INVENTION [0005] The present invention provides a tapping oil agent for tap water which is excellent in biodegradability while maintaining the required cutting properties and tube washing properties and which does not adversely affect the ecosystem. The purpose is to: SUMMARY OF THE INVENTION [0006] The present invention relates to a method for measuring by the CEC method.
A synthetic ester oil and / or a natural fat / oil having a determined biodegradation rate of 67% or more is used as a base oil, and is JIS K3363.
The measured biodegradability is 90-100%,
Non-ionic and / or anion that does not produce phenol
The present invention relates to a tapping oil agent for water service, which contains a surfactant. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention uses a synthetic ester oil and / or a natural fat / oil excellent in biodegradability as a base oil. [0008] As a method for evaluating the biodegradability of lubricating oil, CEC (European Standards Advisory Committee) standard L-33-T-
The method specified in No. 82 (hereinafter referred to as “CEC method”) is the most common, and a biodegradable lubricant having a biodegradation rate of 67% or more is defined as a biodegradable lubricating oil. The CEC method will be described later. The synthetic ester oils and natural fats and oils used as the base oil in the present invention have a biodegradation rate of 67% or more by the CEC method. The synthetic ester oil having such a biodegradation rate has no aromatic ring in the constituent fatty acids, does not have an alkyl group having many branched chains, and has a relatively low molecular weight. The synthetic ester oil usable in the present invention includes, for example, methyl oleate (biodegradation rate about 95%),
Fatty acid monoesters such as butyl stearate (about 95%) and octyl palmitate (about 95%); dioctyl adipate (80-90%), dioctyl sebacate (80-90%), diisooctyl azelate (97
%), Ditridecyl adipate (84%), diisodecyl adipate (90%), dioctyl palmitate (8%)
0-90%), dioctyl tallow fatty acid ester (80-
Diesters of fatty acids such as 90%); trimethylolpropane triheptanoate (100%), trimethylolpropane trioleate (95%), trimethylolpropane tricaprate (90% or more), and pentaerythritol tetraheptanoate (99) %), Trimethylolpropane coconut fatty acid ester (90% or more), and trimethylolpropane rice nuka fatty acid ester (90% or more). Ditridecyl phthalate having an aromatic ring in the fatty acid has a biodegradation rate of 1
Since it is as low as 8%, it is not suitable for the present invention. Among these synthetic ester oils, fatty acid polyol esters such as trimethylolpropane tricaprate, trimethylolpropane trioleate, and pentaerythritol tetraheptanoate are particularly preferable from the viewpoint of threading performance. Natural fats and oils have a high biodegradation rate, almost 90%
That's all. Specific examples include animal fats and oils such as lard oil, beef tallow, bird oil and fish oil; rapeseed oil,
Vegetable oils such as castor oil, rice bran oil, soybean oil, palm kernel oil, coconut oil, olive oil, and the like. These are 1
They can be used in combination of one or more kinds or two or more kinds of the synthetic ester oils. In the oil of the present invention, a mineral oil may be used in combination with the base oil.
The amount must not be less than 7%. As the mineral oil, for example, JIS K-2001 “Industrial lubricating oil viscosity classification” ISO VG-2 (kinematic viscosity at 40 ° C. 1.98)
ISO VG-68 from ~2.42mm ² / s) (40
Kinematic viscosity at 6 ° C. of 61.2 to 74.8 mm ² / s). The threading oil agent for tap water of the present invention essentially requires a surfactant from the viewpoint of washing properties. Surfactants that can be used in the present invention must have excellent biodegradability and low biotoxicity during the biodegradation process and after degradation. As surfactants having excellent biodegradability, anionic surfactants and nonionic surfactants are preferred. The biodegradability of the surfactant is determined according to JIS K336.
3 Evaluated by "Test method for biodegradability of synthetic detergent". Examples of the anionic surfactant include fatty acid salts such as sodium stearate (degree of biodegradation: about 100%) and sodium tallow fatty acid (about 100%); petroleum oils such as sodium petroleum sulfonate (90 to 100%) Sulfonates; alkylbenzene sulfonates such as sodium linear alkylbenzene sulfonate (about 100%); and the like. Examples of the nonionic surfactant include polyoxyethylene alkyl ether (about 100%) and polyoxyethylene fatty acid ester (about 1%).
00%) and polyoxyethylene sorbitan fatty acid ester (about 100%). These surfactants are used alone or in combination of two or more. The surfactant used in the present invention is not only required to have good biodegradability, but also needs to have no adverse effect on the living body during the biodegradation process and after the decomposition. From the viewpoint of such biotoxicity, it is necessary to select a substance that does not generate toxic substances such as highly toxic alkylphenols by biodegradation. For example, polyoxyethylene alkyl phenyl ethers, such as polyoxyethylene nonyl phenyl ether, which produce nonylphenol with high fish toxicity after biodegradation, are not suitable. Of course, the surfactant itself must have low biotoxicity and biostimulability. In this respect, cationic surfactants are not preferred. Particularly preferred surfactants include polyoxyethylene alkyl ethers and polyoxyethylene fatty acid esters from the viewpoints of rough hand, biodegradability, tube washability and the like. Although the surfactant depends on the kind and the like, usually,
0.5 to 30% (% by weight; the same applies hereinafter), preferably 5 to 15%, of the base oil. If the amount of the surfactant is too large, metal adsorption becomes poor and the machinability may be reduced, the hand may be roughened, or the paint may be peeled off. If the amount is too small, the washing properties may be insufficient. Various additives commonly used in metalworking oils can be added to the tapping oil agent for waterworks of the present invention. However, such additives must not adversely affect the ecosystem. Specific examples include sulfurized fatty oils such as sulfurized lard oil, sulfur-based extreme pressure additives such as polysulfide, and sulfurized mineral oils such as fatty acids such as oleic acid, ricinoleic acid, and stearic acid. Next, the threading agent for tap water of the present invention will be described with reference to examples, but the present invention is not limited to these examples. Examples 1 to 5 and Comparative Examples 1 to 3 Water tapping oils having the compositions (parts by weight) shown in Table 1 were prepared. Mineral oil A (ISO VG-10) at 40 ° C.
Is a paraffinic mineral oil having a kinematic viscosity of 9.0 to 11 mm ² / s and a biodegradation rate of 30 to 50%. Mineral oil B (ISO VG-22) has a kinematic viscosity at 40 ° C of 1
It is a naphthenic mineral oil having a biodegradability of 0 to 20% at a rate of 9.8 to 24.2 mm ² / s. Synthetic ester oils A is trimethylolpropane C ₈ -C ₁₀ fatty acid ester (95% biodegradation rate), synthetic ester oil B is trimethylolpropane trioleate (biodegradation rate of 95%), natural fats A is rapeseed oil (biodegradable 98%), and each has the properties shown in Table 2. Sulfurized fatty oils are sulfurized lard oils. Surfactant A is a polyoxyethylene alkyl ether (degree of biodegradation about 100%, HLB 5 to 10), surfactant B is polyoxyethylene alkyl ether (degree of biodegradation about 100%, HLB 10 to 15), surfactant Agent C
Is a polyoxyethylene alkyl phenyl ether (degree of biodegradation: about 95%, HLB 5 to 10) and surfactant D is a polyoxyethylene alkyl phenyl ether (degree of biodegradation: about 95%, HLB 10 to 15). (Washability test) With respect to the oils prepared in Examples 1 to 5 and Comparative Examples 1 to 3, a water washability test (JWWA K13) specified by the Japan Water Works Association (JWWA).
7 quality standards), all of them passed the standards including the comparative examples. (Biodegradability test) CEC standard L-33-T
The biodegradability was examined based on the -82 biodegradability test method (CEC method). The biodegradation rate in the CEC method was determined by mixing a test oil, a required nutrient, and water, culturing a flask inoculated with treated wastewater from a municipal sewage plant and a blank test flask containing no bacterium for 21 days. Each of the subsequent sample solutions was extracted with carbon tetrachloride or 1,1,2-trichlorofluoroethane,
CH ₃ —CH 2930 cm ⁻¹ was determined by IR spectroscopy.
The absorption of _two bonds was measured, and the difference in absorbance between the test flask and the blank test flask was expressed in%. However, since the oil agent of the present invention contains a surfactant, it is emulsified in water and carbon tetrachloride or 1,1,
It cannot be extracted with 2-trichlorofluoroethane. Therefore, in the present invention, diethyl ether / benzene / isopropyl alcohol (1/1/3 weight ratio) is used as the extraction solvent.
CEC method was carried out using a mixed solvent of The results are shown in Table 1. [Table 1] [Table 2] In both Comparative Examples 1 and 2, the biodegradation rate was 6 according to the CEC method.
Although it is 7% or more, the biodegradation of a surfactant produces an alkylphenol, which is a harmful substance.
Has a low biodegradation rate of 40%, which is not preferable from the viewpoint of protecting the global environment. (Thread Cutting Test) A thread cutting test was performed by the following method. (Experimental conditions) Pipe type and diameter: SGP-B, 65A Chooser: 2.5 to 3 for automatic round-up die head Number of cuts: 300 pieces for each oil agent Cutting method: Push-cut by pipe cutter Evaluation method: Each cut The maximum current consumption (A) at the time and the finished state of the screw (A: excellent, B: good, C: poor) Examples 6 to 10 Using synthetic ester oils and natural fats and oils and surfactants shown in Table 3, A tapping oil agent for tap water of the present invention having the composition shown in the table was prepared. A water-washing property test, a biodegradability test, and a threading test were performed on each threading oil in the same manner as in Example 1. Table 3 shows the results. The base oils and surfactants in Table 3 are as follows. Synthetic ester oil C: methyl oleate (biodegradation rate: about 95%) Synthetic ester oil D: dioctyl tallow fatty acid ester (biodegradation rate: 80 to 90%) Natural fat B: lard oil (biodegradation rate: about 95%) Surfactant E: sodium petroleum sulfonate (biodegradability 9)
(0-100%) Table 4 shows the properties of the synthetic ester oils C and D and the natural fats and oils B. [Table 3] [Table 4] According to the present invention, it is possible to provide a tapping oil agent for tap water which is easily biodegraded and does not generate harmful substances even when it leaks to the outside due to leakage or washing of the oil agent. It is informative.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10M 135: 10 C10M 135: 10 145: 26) 145: 26 C10N 30:00 C10N 30:00 Z 30:06 30:06 40: 22 40:22 (72) Inventor Masaaki Maruyama 8-3, Sanbongi, Inaya, Seika-cho, Soraku-gun, Kyoto (56) References JP-A-2-233798 (JP, A) JP-A-6-128583 (JP, A JP-A-2-247298 (JP, A) JP-A-59-210693 (JP, A) JP-A-4-335095 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10M 169/04 C10M 101/04 C10M 105/32-105/48 C10M 129/16 C10M 129/26-129/84 C10M 135/10 C10M 145/26-145/38 C10N 30:00 C10N 30:06 C10N 40 :twenty two

Claims (1)

(57) [Claims] [Claim 1] The biodegradation rate measured by the CEC method is 67% or less.
Using the above synthetic ester oil and / or natural fat / oil as a base oil, the biodegradation rate measured by JIS K3363 is 90 to
100% non-ion free of alkylphenol
Down system and / or anionic surfactant water canal threading oil <br/> ing it is blended is.