Tapping torque rust inhibitor and rust-preventive oil composition

Abstract

The present invention aims to provide a tapping torque rust inhibitor or an anti-rust oil composition that not only has rust-preventing properties but also can impart excellent tapping torque properties. Furthermore, the present invention also aims to provide an environmentally friendly tapping torque rust inhibitor or an anti-rust oil composition. The present invention relates to a tapping torque rust inhibitor containing rice oil, and also to a rust-preventive oil composition containing the tapping torque rust inhibitor and a rust inhibitor.

Description

[Technical field]

[0001] The present invention relates to a tapping torque rust inhibitor and a rust-preventive oil and fat composition. [Background technology]

[0002] Metal fastening members, including screws, bolts, nuts, nails, etc., are indispensable for manufacturing many structures, such as architectural structures and automobiles. Among these metal fastening members, those used outdoors rust and corrode and deteriorate when exposed to the outside air due to moisture, salt, etc. Therefore, the occurrence of rust has a significant impact on the durability, corrosion resistance, etc. of structures that use them. Therefore, various rust inhibitors have been developed to improve the corrosion resistance of metals. For example, chromate, hexavalent chromium, and other rust inhibitors are known as preservatives.

[0003] However, in view of recent environmental issues, there is an increasing demand for the development of more environmentally friendly products, particularly for the use of highly safe substances derived from natural products such as plants.

[0004] For example, Patent Document 1 describes a rust inhibitor containing tannins such as persimmon tannins. However, it is described that the rust inhibitors containing tannins have problems with durability. In recent years, from the perspective of SDGs and the like, it is expected that the development of products using such environmentally friendly plant-derived raw materials will be accelerated.

[0005] Incidentally, among the screws, which are metal fastening members used in the above-mentioned architectural structures, etc., tapping screws, for example, are commonly used because they are efficient and easy to use, since they do not require thread cutting using a tap or internal threads such as nuts, and can be used only by drilling a pilot hole. However, although such tapping screws are capable of fastening while cutting an internal thread into the mating member themselves, they pose problems such as the need for torque (rotational force) when forming the internal thread, which can cause fatigue for the worker. Furthermore, because an electric screwdriver tool is used for this work, the drive part (recess) of the screw head gets scratched and the plating or other coating on the metal surface of the screw peels off, which inevitably causes the surface to rust. Therefore, there is a strong demand for the development of a screw that has good tapping torque properties and excellent rust prevention performance. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2001-089868 A Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a tapping torque rust inhibitor or a rust-preventive oil composition which not only has rust-preventing performance but also can impart excellent tapping torque properties. Another object of the present invention is to provide an environmentally friendly tapping torque rust inhibitor or rust-preventive oil and fat composition. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to develop a tapping torque rust inhibitor or a rust-preventive oil composition that not only has rust-preventive properties but also can provide excellent tapping torque properties, and have found that the above-mentioned object can be achieved by using rice oil or a combination of rice oil and a rust inhibitor. The present invention has been completed based on this knowledge.

[0009] That is, the present invention is as follows. Section 1. A tapping torque rust inhibitor containing rice oil. Section 2. Item 1. A rust-preventive oil composition comprising the tapping torque rust inhibitor according to item 1 and a further rust inhibitor. Section 3. Item 3. The rust-preventive oil and fat composition according to Item 2, wherein the rust inhibitor comprises a nitrogen-containing compound, a fatty acid ester compound, a phosphoric acid ester compound, or a persimmon tannin. Section 4. The rice oil contains oleic acid and linoleic acid, Item 3. The rust-preventive oil and fat composition according to Item 2, wherein the content of the linoleic acid is 20 to 100 parts by mass per 100 parts by mass of the oleic acid. Section 5. Item 4. The rust-preventive oil composition according to Item 3, wherein the rust inhibitor is a nitrogen-containing compound. Section 6. Item 6. The rust-preventive oil composition according to Item 5, wherein the nitrogen-containing compound is an azole compound. Section 7. Item 6. The rust-preventive oil and fat composition according to Item 5, wherein the content of the nitrogen-containing compound is 0.05 to 1 part by mass with respect to 100 parts by mass of the rice bran oil. Section 8. Item 8. A lubricating oil composition comprising the tapping torque rust inhibitor according to item 1 or the rust preventive oil composition according to any one of items 2 to 7. Section 9. 8. A metal fastening member comprising a layer formed from the tapping torque rust inhibitor according to item 1 or the rust preventive oil-and-fat composition according to any one of items 2 to 7. Section 10. Item 8. A screw having a layer formed from the tapping torque rust inhibitor according to item 1 or the rust preventive oil-and-fat composition according to any one of items 2 to 7. Section 11. Item 8. A top coating agent for screws, comprising the tapping torque rust inhibitor according to item 1 or the rust preventive oil and fat composition according to any one of items 2 to 7. Section 12. Item 8. An anti-electrolytic corrosion agent comprising the tapping torque rust inhibitor according to item 1 or the rust-preventive oil and fat composition according to any one of items 2 to 7.

[0010] In the case of inventions of products defined by a preparation process, it is impossible or impractically difficult to specify at this time what components are contained or what their structure is, so they are described using a product-by-process claim. Effect of the Invention

[0011] According to the present invention, it is possible to provide a tapping torque rust inhibitor or a rust-preventive oil composition which not only has rust-preventing performance but also can impart excellent tapping torque properties. Furthermore, according to the present invention, it is possible to provide an environmentally friendly tapping torque rust inhibitor or rust-preventive oil and fat composition. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a photograph of a screw after completion of a corrosion resistance (rust prevention) test using the rust preventive oil composition of Example 2. [Diagram 2] FIG. 2 is a photograph of a screw after completion of a corrosion resistance (rust prevention) test using the rust preventive oil composition of Comparative Example 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The tapping torque rust inhibitor or the rust-preventive oil composition of the present invention and the preparation method thereof will be described in detail below.Furthermore, the lubricating oil composition containing the tapping torque rust inhibitor or the rust-preventive oil composition, the metal fastening member having a layer formed from the tapping torque rust inhibitor or the rust-preventive oil composition, the screw having a layer formed from the tapping torque rust inhibitor or the rust-preventive oil composition, the topcoat agent for screws containing the tapping torque rust inhibitor or the rust-preventive oil composition, and the electrolytic corrosion inhibitor containing the tapping torque rust inhibitor or the rust-preventive oil composition will be described below.

[0014] Tapping torque rust inhibitor The tapping torque rust inhibitor of the present invention contains rice oil.

[0015] The rice oil used in the present invention refers to oil obtained from rice bran. Among rice oils, rice germ oil containing a relatively large amount of γ-oryzanol is called rice germ oil. Here, rice oil includes rice germ oil. The rice oil is not particularly limited, and examples thereof include "Rice Salad Oil" manufactured by Tsuno Foods Industry Co., Ltd. and "Rice Oil" manufactured by Tsuno Foods Industry Co., Ltd.

[0016] Rice oil contains fatty acids that are liquid at room temperature, such as oleic acid, linoleic acid, α-linolenic acid, and palmitic acid.

[0017] Oleic acid is an unsaturated fatty acid, and is an omega-9 fatty acid with a carbon number: double bond number ratio of 18:1 (n-9), represented by the formula CH3(CH2)7CH=CH(CH2)7COOH. Oleic acid has a melting point of 13.4°C. Linoleic acid is an unsaturated fatty acid, and is an omega-6 fatty acid with a carbon number: double bond number ratio of 18:2 (n-6), represented by the formula CH3(CH2)4(CH=CHCH2)2(CH2)6COOH. Linoleic acid has a melting point of -5°C. α-Linolenic acid is an unsaturated fatty acid, and is an omega-3 fatty acid with a carbon number: double bond number ratio of 18:3 (n-3) represented by CH3CH2(CH=CHCH2)3(CH2)6COOH. α-Linolenic acid has a melting point of -11°C. Palmitic acid is a saturated fatty acid with the CH3(CH2) 14 Palmitic acid is a fatty acid with a carbon number: double bond number ratio of 16:0, expressed as COOH. Its melting point is 62.9°C.

[0018] In addition to fatty acids, rice oil also contains vitamin E (tocopherol), tocotrienol, γ-oryzanol, etc. The fatty acids in rice oil usually contain about 44% (40-45%) oleic acid, about 36% (35-40%) linoleic acid, about 1.2% (1-2%) α-linolenic acid, and about 17% (15-20%) palmitic acid. Therefore, in the present invention, an oil and fat composition containing 40-45% oleic acid, 35-40% linoleic acid, 1-2% α-linolenic acid, and 15-20% palmitic acid may be used instead of rice oil.

[0019] The rice bran oil preferably contains γ-oryzanol. The γ-oryzanol content of rice bran oil is not particularly limited, and for example, it is preferably 0.01 mass% or more, more preferably 0.05 mass% or more, even more preferably 0.1 mass% or more, and particularly preferably 0.3 mass% per 100 parts by mass of rice bran oil.

[0020] The rice oil used in the present invention is not limited to oil obtained from rice bran, but may also be vegetable oil or the like that has a fatty acid ratio that matches that of rice oil. In addition, rice oil can be not only new oil (new oil) but also recycled rice oil (hereinafter referred to as recycled rice oil, etc.). The rice oil preferably contains oleic acid and linoleic acid. The content of linoleic acid in rice bran oil is usually 20 to 100 parts by mass, preferably 50 to 90 parts by mass, and more preferably 80 to 85 parts by mass, relative to 100 parts by mass of oleic acid. The content of α-linolenic acid in rice bran oil is usually 1 to 5 parts by mass, preferably 1.5 to 4 parts by mass, and more preferably 2 to 3 parts by mass, per 100 parts by mass of oleic acid. The content of palmitic acid in rice bran oil is usually 10 to 60 parts by mass, preferably 20 to 50 parts by mass, and more preferably 30 to 40 parts by mass, relative to 100 parts by mass of oleic acid. As the rice bran oil, only one type may be used, or two or more types may be used.

[0021] It is considered that the smaller the tapping torque value, the better. When the tapping torque rust inhibitor of the present invention is applied to a screw and measured with a torque analyzer (manufactured by Atonic Co., Ltd., product name: 20 N m torque analyzer), the maximum torque of a 4 mm diameter drill screw is preferably less than 5.0 N m, more preferably less than 4.8 N m, and particularly preferably less than 4.7 N m.

[0022] The tapping torque rust inhibitor of the present invention may further contain other components. Here, the tapping torque rust inhibitor containing other components can be rephrased as a rust-preventive oil and fat composition.

[0023] Rust-preventive oil composition The rust-preventive oil and fat composition of the present invention contains the above-mentioned tapping torque rust inhibitor and further contains a rust inhibitor. The tapping torque rust inhibitor contains rice oil. The rice oil may be the same as that described above.

[0024] Rust inhibitor The rust inhibitor is not particularly limited as long as it is a known rust inhibitor, and examples thereof include nitrogen-containing compounds, fatty acid ester compounds, phosphoric acid ester compounds, persimmon tannins, etc. Among them, oil-soluble rust inhibitors that dissolve in rice oil are preferred. The HLB of the rust inhibitor is not particularly limited, but is preferably 5 to 17, more preferably 6 to 10.

[0025] nitrogen-containing compounds The nitrogen-containing compound is not particularly limited as long as it is a compound containing at least one nitrogen atom. Examples of the nitrogen-containing compound include imidazole-based compounds such as imidazole, 1-methylimidazole, 2-methylimidazole, 2-ethyl-4-ethylimidazole, 2-ethylimidazole, N-(3-aminopropyl)imidazole, 1,2-dimethylimidazole, and 2-(heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethanol (VpCI (registered trademark, hereinafter omitted)-369, HLB: 6.3, manufactured by Cortec Co., Ltd.), pyrazole-based compounds such as 1,4-dimethylpyrazole, benzothiazole-based compounds such as mercaptobenzothiazole, and benzotriazole-based compounds such as benzotriazole; diamine compounds such as DTPA and EDTA (ethylenediaminetetraacetic acid), manufactured by Chelesto Co., Ltd.; amine salts of oxidized paraffin (Chireslite BS, Cheleslite Z-7); monoethanolamine, diethanolamine, triethanolamine, and triethanolamine. Alkanolamines with medium to high pKa, low to medium volatility, and hydrophilic properties, such as triethanolamine, mono-n-propanolamine, di(n-propanol)amine, tri(n-propanol)amine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methylisopropanolamine, N-methylethanolamine, N-ethylethanolamine, N-butylethanolamine, N-methyldiethanolamine, N-methyldiisopropanolamine, N-butyldiethanolamine, N-octyldiethanolamine, N,N-dimethylethanolamine, N,N-dimethylisopropanolamine, N,N-diethylethanolamine, N,N-dibutylethanolamine, 2-(2-aminoethyl)ethanol, dimethylaminoethoxyethanol, 4-(2-hydroxyethyl)morpholine, and 3-dimethylamino-1-propanol;Medium to high pKa, medium to low pKa, such as dicyclohexylamine, 2-(diethylamino)ethylamine, 3-(diethylamino)propylamine, 2-ethylhexylamine, di-(2-ethylhexylamine), tris-(2-ethylhexyl)amine, N-methylmorpholine, morpholine, octamethylenediamine, n-octylamine, N,N,N',N'-tetramethyl-1,6-hexamethylenediamine, N,N,N',N'-tetramethyl-1,3-propanediamine, tridecylamine (mixture of isomers), ditridecylamine (mixture of isomers), benzylamine, pyrrolidine, 2,2'-dimorpholinodiethyl ether, 3-methoxypropylamine, polyetheramine D2000, polyetheramine D230, etc. Examples of the amine compounds include highly volatile, hydrophobic alkylamines; acetylene alcohols such as 3-butyn-2-ol, 1-ethynyl-1-cyclohexanol, 4-ethyl-1-octyn-3-ol, 2-methyl-3-butyn-2-ol, and propargyl alcohol; polyoxyethylene laurylamines such as Amite (registered trademark, hereinafter omitted) 102 (manufactured by Kao Corporation, HLB: 6.3), Amite 105 (HLB: 9.8), and Amite 105A; polyoxyethylene stearylamines such as Amite 302 (HLB: 5.1), Amite 308 (HLB: 12.1), and Amite 320 (HLB: 15.4); and alkylamine ethylene oxide adducts (also called ethylene oxide adduct fatty amines). Among these, the nitrogen-containing compounds are preferably azole-based compounds, more preferably imidazole-based compounds, and particularly preferably imidazole compounds having a molecular weight of 300 or more. ;

[0026] The HLB value of the nitrogen-containing compound is not particularly limited, but is preferably 5-17, and more preferably 6-10. The content of the nitrogen-containing compound is not particularly limited, and is, for example, usually 0.05 to 10 parts by mass, preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 2 parts by mass, per 100 parts by mass of rice bran oil. As the nitrogen-containing compound, only one type may be used, or two or more types may be used.

[0027] Fatty acid ester compounds The fatty acid ester compound is a compound formed by the reaction of a fatty acid with an alcohol, and is not particularly limited as long as it is an organic compound having a fatty acid ester group, and examples thereof include fatty acid esters such as sorbitan fatty acid ester (manufactured by Riken Vitamin Co., Ltd., product name: Poem O-80V), glycerin fatty acid ester (manufactured by Riken Vitamin Co., Ltd., product name: Poem G-002), polyoxyethylene sorbitan fatty acid ester, and polyoxysorbitol fatty acid ester. Examples of sorbitan fatty acid esters include sorbitan fatty acid monoesters such as sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, and sorbitan monooleate; sorbitan fatty acid diesters such as sorbitan dilaurate, sorbitan dipalmitate, sorbitan distearate, and sorbitan dioleate; and sorbitan fatty acid triesters such as sorbitan trilaurate, sorbitan tripalmitate, sorbitan tristearate, and sorbitan trioleate. The HLB of the fatty acid ester compound is not particularly limited, but is preferably 5-17, and more preferably 6-10. Examples of glycerol fatty acid esters include glycerol fatty acid monoesters such as monoglycerides and acetylated monoglycerides, glycerol fatty acid diesters such as organic acid monoglycerides, glycerol fatty acid mono- and di-esters such as mono- and diglycerides, and glycerol fatty acid triesters such as medium-chain fatty acid triglycerides.

[0028] Specific examples of glycerin fatty acid monoesters include glycerin monocaprylate, glycerin monocaprate, glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin mono-12-hydroxystearate, glycerin monoarachidiate, glycerin monobehenate, and glycerin monooleate.

[0029] Specific examples of glycerin fatty acid diesters include glycerin dicaprylate, glycerin dicaprate, glycerin dilaurate, glycerin dimyristate, glycerin dipalmitate, glycerin distearate, and glycerin dioleate.

[0030] Specific examples of glycerin fatty acid mono- and diesters include glycerin mono-distearate, glycerin mono-dibehenate, and glycerin mono-diolate.

[0031] Specific examples of glycerin fatty acid triesters include glycerin tricaprylate, glycerin tricaprate, and glycerin trilaurate.

[0032] Examples of polyglycerol fatty acid esters include diglycerol fatty acid esters, tetraglycerol fatty acid esters, pentaglycerol fatty acid esters, hexaglycerol fatty acid esters, and decaglycerol fatty acid esters.

[0033] Specific examples of diglycerol fatty acid esters include diglycerol fatty acid monoesters such as diglycerol monocaprylate, diglycerol monocaprate, diglycerol monolaurate, diglycerol monomyristate, diglycerol monopalmitate, diglycerol monostearate, and diglycerol monooleate; and diglycerol fatty acid diesters such as diglycerol dilaurate, diglycerol dimyristate, diglycerol dipalmitate, diglycerol distearate, and diglycerol dioleate.

[0034] Specific examples of tetraglycerol fatty acid esters include tetraglycerol fatty acid monoesters such as tetraglycerol monolaurate, tetraglycerol monomyristate, tetraglycerol monopalmitate, tetraglycerol monostearate, and tetraglycerol monooleate; tetraglycerol fatty acid triesters such as tetraglycerol trilaurate, tetraglycerol trimyristate, tetraglycerol tripalmitate, tetraglycerol tristearate, and tetraglycerol trioleate; and tetraglycerol fatty acid pentaesters such as tetraglycerol pentalaurate, tetraglycerol pentamiristate, tetraglycerol pentapalmitate, tetraglycerol pentastearate, and tetraglycerol pentaoleate.

[0035] Specific examples of pentaglycerin fatty acid esters include pentaglycerin fatty acid monoesters such as pentaglycerin monolaurate, pentaglycerin monomyristate, pentaglycerin monopalmitate, pentaglycerin monostearate, and pentaglycerin monooleate, pentaglycerin fatty acid diesters such as pentaglycerin distearate, pentaglycerin fatty acid triesters such as pentaglycerin tristearate, and pentaglycerin fatty acid hexaesters such as pentaglycerin hexastearate.

[0036] Specific examples of hexaglycerol fatty acid esters include hexaglycerol fatty acid monoesters such as hexaglycerol monolaurate, hexaglycerol monomyristate, hexaglycerol monopalmitate, hexaglycerol monostearate, and hexaglycerol monooleate, hexaglycerol fatty acid triesters such as hexaglycerol tristearate, and hexaglycerol fatty acid pentaesters such as hexaglycerol pentastearate and hexaglycerol pentaoleate.

[0037] Specific examples of decaglycerol fatty acid esters include decaglycerol fatty acid monoesters such as decaglycerol monolaurate, decaglycerol monomyristate, decaglycerol monopalmitate, decaglycerol monostearate, and decaglycerol monooleate; decaglycerol fatty acid diesters such as decaglycerol distearate; decaglycerol fatty acid triesters such as decaglycerol tristearate; decaglycerol pentaesters such as decaglycerol pentastearate and decaglycerol pentaoleate; and decaglycerol decaesters such as decaglycerol decaesterate and decaglycerol decaoleate.

[0038] Among them, the fatty acid ester compound is preferably a fatty acid ester having one or two hydroxyl groups, more preferably a sorbitan fatty acid ester, and particularly preferably a sorbitan fatty acid ester and a glycerin fatty acid ester. The fatty acid ester compound may have the effect of a nonionic surfactant.

[0039] The content of the fatty acid ester compound is not particularly limited, and is, for example, usually 0.05 to 10 parts by mass, preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 2 parts by mass, relative to 100 parts by mass of rice bran oil. As the fatty acid ester compound, only one type may be used, or two or more types may be used.

[0040] Phosphate Compounds The phosphate ester compound is not particularly limited as long as it is a compound having a phosphate ester group, and examples thereof include acid phosphate ester of castor oil (Killeslite P-21A, manufactured by Chelesto Co., Ltd.), acid phosphate calcium salt of castor oil (Killeslite P-21C, manufactured by Chelesto Co., Ltd.), and phosphate ester (Killeslite P-18C, manufactured by Chelesto Co., Ltd.). Among them, phosphate ester compounds are preferred.

[0041] The content of the phosphate ester compound is not particularly limited, and is, for example, usually 0.05 to 10 parts by mass, preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 2 parts by mass, relative to 100 parts by mass of rice bran oil. As the phosphate ester compound, only one type may be used, or two or more types may be used.

[0042] Persimmon tannin The persimmon tannin is not particularly limited, and for example, commercially available persimmon tannins can be used. For example, commercially available persimmon tannins include tannin ("Kakishibu" manufactured by Osugi Katagami Kogyo Co., Ltd.), tannic acid ("Tannic Acid AL" manufactured by Fuji Chemical Industry Co., Ltd.), and persimmon tannin extract (manufactured by Release Science Industry Co., Ltd., natural plant extract). The content of persimmon tannin is not particularly limited, and is, for example, usually 0.05 to 10 parts by mass, preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 2 parts by mass, per 100 parts by mass of rice bran oil. As the persimmon tannin, only one type may be used, or two or more types may be used.

[0043] Other examples of oil-soluble rust inhibitors include petroleum sulfonic acid-based dehumidifying penetrating rust inhibitor (Cebo EP-10, manufactured by Toyo Pharmaceutical Co., Ltd.), sulfonic acid-based rust inhibitors such as alkylnaphthalenesulfonates, and alkenylsuccinic anhydrides.

[0044] Fats and oils other than rice oil In addition to the rice bran oil and the rust inhibitor, the rust-preventive oil composition of the present invention can further contain oils and fats other than rice bran oil. Examples of oils and fats other than rice bran oil include vegetable oils and fats other than rice bran oil, mineral oils, etc.

[0045] The vegetable oil other than rice oil is not particularly limited, and examples thereof include coconut oil, canola oil, cottonseed oil, camellia oil, soybean oil, and olive oil. As the vegetable oil other than rice oil, only one type may be used, or two or more types may be used.

[0046] Examples of mineral oils include aromatic hydrocarbons, paraffinic hydrocarbons, naphthenic hydrocarbons, etc. More specifically, examples of the mineral oils include spindle oil, liquid paraffin, etc. Commercially available products of these mineral oils can be appropriately used. As the mineral oil, only one type may be used, or two or more types may be used.

[0047] Optional ingredients The rust-preventive oil and fat composition (base component) of the present invention may further contain surfactants, pigments, silane coupling agents, rust inhibitors other than nitrogen-containing compounds, lubricants, other additives, and the like.

[0048] The surfactant is not particularly limited, and examples thereof include cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, etc. In addition, the surfactants referred to here are included in the definition of the rust inhibitor when they overlap with the compounds described above as the rust inhibitor.

[0049] The cationic surfactant is not particularly limited, and examples thereof include alkyl (having 8 to 24 carbon atoms) trimethylammonium salts, dialkyl (having 8 to 24 carbon atoms) dimethylammonium salts, alkyl (having 8 to 24 carbon atoms) pyridinium salts, and alkyl (having 8 to 24 carbon atoms) dimethylbenzylammonium salts. Examples of amidoamine surfactants include stearic acid diethylaminoethylamide, stearic acid dimethylaminoethylamide, palmitic acid diethylaminoethylamide, palmitic acid dimethylaminoethylamide, myristic acid diethylaminoethylamide, myristic acid dimethylaminoethylamide, behenic acid diethylaminoethylamide, behenic acid dimethylaminoethylamide, isostearic acid diethylaminoethylamide, isostearic acid dimethylaminoethylamide, stearic acid diethylaminopropylamide, stearic acid dimethylaminopropylamide, palmitic acid diethylaminopropylamide, palmitic acid dimethylaminopropylamide, myristic acid diethylaminopropylamide, myristic acid dimethylaminopropylamide, behenic acid diethylaminopropylamide, behenic acid dimethylaminopropylamide, isostearic acid diethylaminopropylamide, isostearic acid dimethylaminopropylamide, and the like.

[0050] The anionic surfactant is not particularly limited, and examples thereof include alkyl (carbon number: 8 to 24) sulfates, alkyl (carbon number: 8 to 24) ether sulfates, alkyl (carbon number: 8 to 24) benzenesulfonates, dialkyl (carbon number: 8 to 24) sulfosuccinates, polyoxyalkylene alkyl (carbon number: 8 to 24) ether sulfosuccinates, alkyl (carbon number: 8 to 24) phosphates, polyoxyalkylene alkyl (carbon number: 8 to 24) ether phosphates, acylated (carbon number: 8 to 24) taurate salts, etc. Examples of such salts include phosphate salts, acylated methyl taurine salts (having 8 to 24 carbon atoms), acylated alanine salts (having 8 to 24 carbon atoms), acylated N-methyl-β-alanine salts (having 8 to 24 carbon atoms), acylated glutamate salts (having 8 to 24 carbon atoms), acylated isethionate salts (having 8 to 24 carbon atoms), acylated sarcosinate salts (having 8 to 24 carbon atoms), α-sulfofatty acid ester salts, ether carboxylate salts, long-chain (having 8 to 24 carbon atoms) carboxylate salts, and polyoxyalkylene fatty acid monoethanolamide sulfate salts. Among these, preferred anionic surfactants include alkyl (having 8 to 24 carbon atoms) sulfates, alkyl (having 8 to 24 carbon atoms) ether sulfates, alkyl (having 8 to 24 carbon atoms) sulfosuccinates, polyoxyalkylene alkyl (having 8 to 24 carbon atoms) ether sulfosuccinates, alkyl (having 8 to 24 carbon atoms) phosphates, polyoxyalkylene alkyl (having 8 to 24 carbon atoms) ether phosphates, acylated (having 8 to 24 carbon atoms) taurines, acylated (having 8 to 24 carbon atoms) methyl taurines, acylated (having 8 to 24 carbon atoms) sarcosinates, polyoxyalkylene fatty acid monoethanolamide sulfates, alkyl polyoxyalkylene sulfates, and sodium sulfates of animal and vegetable oils.

[0051] The nonionic surfactant is not particularly limited, and examples thereof include silicone-based surfactants; polyoxyethylene alkylphenyl ethers; polyoxyethylene fatty acid esters; formalin condensates of polyoxyethylene alkylphenyl ethers; polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers and polyoxypropylene alkyl ethers; sorbitan higher fatty acid ester-based surfactants; polyoxyethylene aryl ethers; polyoxyethylene (mono-, di-, or tri-)phenylphenyl ethers; polyoxyethylene (mono-, di-, or tri-)benzyl phenyl ethers; polyoxypropylene (mono-, di-, or tri-)benzyl phenyl ethers; polyoxyethylene (mono-, di-, or tri-)styryl phenyl ethers; polyoxypropylene (mono-, di-, or tri-)styryl phenyl ethers; polyoxyethylene (mono-, di-, or tri-)styryl phenyl ethers; Examples of suitable surfactants include polymers of allylphenyl ether; polyoxyethylene polyoxypropylene block polymers; alkyl polyoxyethylene polyoxypropylene block polymer ethers; alkylphenyl polyoxyethylene polyoxypropylene block polymer ethers; polyoxyethylene bisphenyl ether; polyoxyethylene resin acid esters; glycerol fatty acid ester ethylene oxide adducts; castor oil ethylene oxide adducts; hydrogenated castor oil ethylene oxide adducts; alkylamine ethylene oxide adducts and fatty acid amide ethylene oxide adducts; polyoxyethylene fatty acid amides; alkylphenoxypolyethoxyethanol and polyoxyethylene rosin esters; and acetylene-based surfactants such as acetylene glycol or its ethylene oxide adduct, and acetylene alcohol or its ethylene oxide adduct.

[0052] Examples of the silicone surfactant include KF-640 (polyoxyethylene methyl polysiloxane; manufactured by Shin-Etsu Chemical Co., Ltd.), DyneAmic (manufactured by STERE CHEMICAL Co., Ltd.), KINETIC (polyalkylene modified polymethyl siloxane nonionic surfactant; manufactured by STERE CHEMICAL Co., Ltd.), Silwet L-77 (silicon polyalkylene oxide modified methyl polysiloxane; manufactured by Witco Co., Ltd.), and SLIPPA (mixture of silicon polyalkylene oxide modified methyl polysiloxane and linear alcohol surfactant; manufactured by INTERAGRO Co., Ltd.). These silicone surfactants are distinguished from silicones used as antifoaming agents, which are added in small amounts to rust-preventive oil and fat compositions.

[0053] Examples of the polyoxyethylene alkylphenyl ether include trade name Althorpe 30 (containing 30% polyoxyethylene nonylphenyl ether; manufactured by Sumitomo Chemical Co., Ltd.), trade name Agral 30 (manufactured by ICI), trade name Agral 90 (manufactured by ICI), trade name Agral PLUS (manufactured by ICI), trade name ARKOPAL N-100 (manufactured by Hoechst), trade name CITOWETT (manufactured by BASF), trade name Genapol X-60, trade name Kusarino (registered trademark) (manufactured by Nihon Nohyaku Co., Ltd.), trade name Noigen (registered trademark, hereinafter omitted) EA110 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), trade name Mixpower (registered trademark) (containing 40% polyoxyethylene alkylphenyl ether and 40% polyoxyethylene alkyl ether; manufactured by Tomono Agrica Co., Ltd.), and the like.

[0054] Examples of the polyoxyalkylene alkyl ether include trade name Noigen TDS-70 (polyoxyethylene alkyl ether, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and trade name Newcalgen (registered trademark) R-100 (polyoxyalkylene alkyl ether, manufactured by Takemoto Yushi Co., Ltd.).

[0055] Examples of the polyoxyethylene fatty acid ester include those under the trade name Lamigen (registered trademark) ES-70 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), those under the trade name EMULAN (registered trademark) PS700 (manufactured by BASF), those under the trade name Panguard KS-20 (manufactured by Mitsui Toatsu Agricultural Chemicals Co., Ltd.), those under the trade name Spray Sticker (manufactured by Nihon Noyaku Co., Ltd.), those under the trade name D-3605 (manufactured by Takemoto Yushi Co., Ltd.), those under the trade name D-230 (manufactured by Takemoto Yushi Co., Ltd.), those under the trade name D-233 N (manufactured by Takemoto Yushi Co., Ltd.), those under the trade name Noigen ET-120E (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and the like.

[0056] Examples of the sorbitan higher fatty acid ester surfactants include Approach (registered trademark) BI (containing 50% polyoxyethylene hexyl ester fatty acid; manufactured by Kao Corporation) and TWEEN (registered trademark) 20 (fatty acid polyoxyethylene sorbitan ester; manufactured by Wako Pure Chemical Industries, Ltd.).

[0057] Furthermore, in the present invention, a mixture of a nonionic surfactant and an anionic surfactant, such as Gramin S (containing 15% polyoxyethylene nonylphenyl ether, 5% polyoxyethylene fatty acid ester, and 4% sodium polynaphthylmethanesulfonate; manufactured by Sankyo Agro Co., Ltd.) can also be used.

[0058] The amphoteric surfactant is not particularly limited, and examples thereof include betaine type surfactants, amino acid type surfactants, etc. Examples of the betaine type surfactants include alkyl (C8-24) amidopropyl betaine, alkyl (C8-24) carboxybetaine, alkyl (C8-24) sulfobetaine, alkyl (C8-24) hydroxysulfobetaine, alkyl (C8-24) amidopropylhydroxysulfobetaine, alkyl (C8-24) hydroxyphosphobetaine, alkyl (C8-24) aminocarboxylate, alkyl (C8-24) sodium amphoacetate, alkyl (C8-24) amine oxide, alkyl (C8-24) phosphate ester containing tertiary nitrogen and quaternary nitrogen, etc.

[0059] When the rust-preventive oil-and-fat composition of the present invention contains a surfactant, the content of the surfactant in the rust-preventive oil-and-fat composition of the present invention is usually 0.05 to 30 mass%, preferably 0.5 to 28 mass%, and more preferably 1 to 25 mass%, relative to 100 mass% of the entire composition. The surfactant may be used alone or in combination of two or more kinds.

[0060] As the pigment, only one of an extender pigment, a color pigment, and an anti-rust pigment may be used, or two or more of them may be used.

[0061] The extender pigment is not particularly limited, and examples thereof include talc, clay, calcium carbonate, magnesium carbonate, barium sulfate, silicic acid, silicates, aluminum oxide hydrate, calcium sulfate, gypsum, micaceous iron oxide (MIO), glass flake, susolite mica, and clarite mica.

[0062] The color pigment is not particularly limited, and examples thereof include titanium oxide, carbon black, white lead, graphite, zinc sulfide, zinc oxide (zinc white), chromium oxide, yellow nickel titanium, yellow chromium titanium, yellow iron oxide, red iron oxide, black iron oxide, phthalocyanine blue, phthalocyanine green, ultramarine blue, quinacridones, azo-based red and yellow pigments, and the like.

[0063] The rust-preventive pigment is not particularly limited, and examples thereof include zinc molybdate, aluminum molybdate, zinc powder (Zn), zinc phosphate, aluminum powder (Al), and the like.

[0064] A silane coupling agent is a compound that has both an organic functional group that exhibits reactivity and / or affinity to organic polymers (such as cured resins) and an organic functional group that exhibits reactivity and / or affinity to inorganic materials (such as pigments contained in anti-rust oil and fat compositions).

[0065] In the present invention, one or more kinds of silane coupling agents can be used as the silane coupling agent. The silane coupling agent is preferably used in an amount of 0.5 to 5% by mass based on the total mass of the base agent.

[0066] As the lubricant, for example, grease can be used, which is composed of a base oil of mineral oil, synthetic oil, or a mixture of the two, a thickener of urea type, extreme pressure additives such as molybdenum disulfide, tungsten disulfide, melamine cyanurate, graphite, boron nitride, etc., and further includes molybdenum dithiocarbamate, zinc dithiocarbamate, zinc dithiophosphonate, sulfur additives, phosphorus additives, oiliness agents, dispersants, and antioxidants.

[0067] The other additives are not particularly limited, and examples thereof include co-use resins, anti-sagging / anti-settling agents, anti-color separation agents, anti-foaming / anti-popping agents, leveling agents, matting agents, solvents, and the like.

[0068] The resin to be used in combination is not particularly limited, and for example, petroleum-based resins (such as xylene resins), acrylic resins, polyester resins, etc. can be used.

[0069] The anti-sagging / anti-settling agent is not particularly limited, and any agent commonly used in the art can be used. For example, a product name such as "Disparlon (registered trademark) 6700" (aliphatic bisamide thixotropic agent, manufactured by Kusumoto Chemicals Co., Ltd.) can be preferably used.

[0070] The solvent is not particularly limited, and examples thereof include weak solvents. A weak solvent is an aliphatic hydrocarbon solvent that has a high flash point, high boiling point, and low toxicity, such as mineral spirits, turpentine, etc. More specific weak solvents include mineral spirits, white spirits, mineral turpentine, isoparaffin, solvent kerosene, aromatic naphtha, VM&P naphtha, solvent naphtha, etc.

[0071] Examples of commercially available weak solvents include "Solvesso (registered trademark) 100", "Solvesso (registered trademark) 150", and "Solvesso (registered trademark) 200" (all manufactured by ExxonMobil Corporation), and "Swasol (registered trademark) 310", "Swasol (registered trademark) 1000", and "Swasol (registered trademark) 1500" (all manufactured by Cosmo Oil Co., Ltd.). Other examples of single-component solvents include aliphatic hydrocarbons such as n-butane, n-hexane, n-heptane, n-octane, isononane, n-decane, n-dodecane, cyclopentane, cyclohexane, and cyclobutane.

[0072] When a solvent is contained, the content of the solvent is usually 5 to 50% by mass based on the total mass of the base material.

[0073] When the rust-preventive oil-and-fat composition of the present invention is applied to a screw and measured with a torque analyzer (product name: 20 N m torque analyzer, manufactured by Atonic Corporation), the maximum torque of a 4 mm diameter drill screw is preferably less than 5.0 N m, more preferably less than 4.8 N m, and particularly preferably less than 4.7 N m.

[0074] Method for preparing rust-preventive oil composition The method for preparing (manufacturing) the rust-preventive oil composition of the present invention is not particularly limited, and does not require a special method, and can be a method commonly used by those skilled in the art.For example, the method for preparing the rust-preventive oil composition of the present invention comprises a step of mixing a tapping torque rust inhibitor (rice oil) and a rust inhibitor (nitrogen-containing compound, fatty acid ester compound, phosphoric acid ester compound, or persimmon tannin).The rust-preventive oil composition that contains only a tapping torque rust inhibitor and a rust inhibitor may also be called a main component. Furthermore, when the rust-preventive oil and fat composition contains optional components (additives, etc.) other than the main component, the preparation method thereof is not particularly limited, and examples thereof include a preparation method in which the tapping torque rust inhibitor, the rust inhibitor, and, if necessary, other components such as the above-mentioned additives are mixed and dispersed using a dispersing machine such as a disperser, a ball mill, an SG mill, or a roll mill.

[0075] Purpose The tapping torque rust inhibitor or anti-rust oil composition of the present invention is a tapping torque rust inhibitor or anti-rust oil composition used on the surface of a metal. The tapping torque rust inhibitor or rust-preventive oil composition of the present invention can be used, for example, as a lubricating oil composition, an anti-electrolytic corrosion agent, a top coating agent for screws, etc. In addition, a metal fastening member having a layer formed from the tapping torque rust inhibitor or the rust-preventive oil-and-fat composition of the present invention, particularly a screw having a layer formed from the tapping torque rust inhibitor or the rust-preventive oil-and-fat composition of the present invention, not only has rust-preventive performance but also has excellent tapping torque properties. The tapping torque rust inhibitor or the rust-preventive oil-and-fat composition of the present invention, and the metal fastening member having a layer formed from the tapping torque rust inhibitor or the rust-preventive oil-and-fat composition of the present invention are environmentally friendly products. In addition, each of the inventions can contain known additives (optional components) for these uses.

[0076] Coating method (painting method) The coating method (painting method) of the tapping torque rust inhibitor or the rust-preventive oil and fat composition of the present invention can be carried out by a general method such as dipping, brushing, roller or spraying. In the tapping torque rust inhibitor or rust-preventive oil / fat composition of the present invention, typically, even the surplus portion generated during centrifugal drying can be reused by filtering.

[0077] Object to be coated The substrate (the object to be coated (painted) with the tapping torque rust inhibitor or the rust-preventive oil-and-fat composition of the present invention) is not particularly limited as long as it is a steel material (metal) that requires rust prevention, and examples thereof include connecting members such as bolts, nuts, screws, nails, and rivets, as well as building materials (construction materials); electrical components; and structural members for automobiles, railways, and ships.

[0078] The surface of the substrate may be previously subjected to a blasting treatment, or may be previously subjected to an anti-rust coating, a shop coating, or an organic or inorganic zinc primer coating.

[0079] Metal Fasteners The type of metallic fastening member is not limited in terms of its material, shape, size, purpose, etc., so long as it is a metal (including an alloy and an intermetallic compound).

[0080] Examples of materials include metals such as iron, copper, titanium, aluminum, nickel, and magnesium, as well as alloys such as steel, stainless steel, brass, titanium-based alloys, aluminum-based alloys, nickel-based alloys, and magnesium-based alloys.

[0081] Also, the product may be one that has been subjected to a surface treatment (surface treatment using a metal film) such as plating, chemical conversion treatment, thermal spraying, painting, anodized film of aluminum alloy, etching, CVD or PVD, etc. In particular, in the present invention, anti-rust plated products can be suitably used. Representative examples of such anti-rust plated products include zinc plated products and alloy plated products such as iron-based, nickel-based, tin-based and chromium-based products. Furthermore, the zinc plated product may be a chromate-treated product such as a glossy chromate (unichrome), colored chromate, black chromate, green chromate, trivalent chromate, etc., or a multi-layered surface-treated product having two or more layers, such as a zinc plating base treatment followed by a top coat such as an aluminum alloy powder coating.

[0082] In addition, surface treatments that do not contain hexavalent chromium, such as surface treatments in which zinc plating is treated with a hexavalent chromium-free film or paint-based surface treatments, may also be used.

[0083] A typical treatment for chromium-based stainless steel screws is passivation treatment.

[0084] Passivation is a rust prevention treatment. For example, by treating a screw with a nitric acid-based oxidizing agent (passivation treatment), an oxide layer (passivation film) with improved rust prevention performance is formed.

[0085] Screw There is no particular limitation on the type of screw as long as it has a helical groove. Here, "screw" is a general term for all screws with a helical groove. Bolts and screws are also types of screws, and in the present invention, bolts and screws are also included in "screws". The method of fixing the screw may be either a method of fastening the screw alone or a method of clamping the screw and a nut. An example of a screw used in the method of clamping between a screw and a nut is a bolt. Examples of screws used in the method of fastening a single screw include drill screws, tapping screws, machine screws, and tapered screws. A drill screw is a screw that is mainly used in steel-framed buildings, sheet metal processed products, etc. This type of drill screw has a drill at the tip that can drill holes in metal plates, so a single drill screw can be used to drill holes, create screw holes, and tighten the screw. Tapping screws can be tapped independently if a pilot hole is drilled with a tapping drill or the like. Therefore, even if the material in which you want to use the screw does not have a female thread with a groove cut into the inner surface of a cylindrical hole to accept a male thread, you can use the screw alone. There are many types of tapping screws, including those with a sharp tip and those with a groove cut into the threaded shaft, and these can be used to cut into the mating material while tightening. The screw may be a screw having a head scratched with an electric drill, etc. The tapping torque rust inhibitor or the rust-preventive oil and fat composition of the present invention has excellent tapping torque properties and rust prevention properties even for scratched screws. EXAMPLES

[0086] The present invention will be described in more detail below with reference to examples, but the technical scope of the present invention is not limited to these examples.

[0087] (1) Examination of tapping torque rust inhibitor <Example 1> 20 g of rice oil (manufactured by Tsuno Foods Co., Ltd., product name: rice salad oil) was prepared and used as tapping torque rust inhibitor 1 (oil 1). The rice oil used contained 42% oleic acid, 36% linoleic acid, and 16% palmitic acid. Separately, stainless steel screws (manufactured by Kokubu Co., Ltd., SUS410 drill screws that had been passivated (by Sakamoto Kogyo Co., Ltd.)) were prepared. The above-mentioned tapping torque rust inhibitor 1 was placed in a beaker (45 mm x 78 mm) and oil was heated to 35°C. The above-mentioned 10 screws were placed in the oil and immersed for 10 minutes. After that, the screws were placed in a basket. To adjust the film thickness, the removed screw was heated and centrifuged and dried in a centrifugal drying tank (manufactured by Kida Seiko Co., Ltd., product name: manual wax device) to obtain screw 1 having a layer (average film thickness 33 μm) formed from tapping torque rust inhibitor 1. The average film thickness is not particularly limited, but is usually in the range of 1 μm to 100 μm, preferably in the range of 10 μm to 75 μm, and more preferably in the range of 25 μm to 50 μm.

[0088] <Comparative Example 1> Comparative screw 1 having a layer (average film thickness 30 μm) formed from comparative oil 1 was obtained in the same manner as in Example 1, except that rice bran oil was replaced with coconut oil (comparative oil 1).

[0089] <Comparative Example 2> Comparative screw 2 having a layer (average film thickness 33 μm) formed from comparative oil 2 was obtained in the same manner as in Example 1, except that rice bran oil was replaced with canola oil (comparative oil 2).

[0090] <Comparative Example 3> Comparative screw 3 having a layer (average film thickness 36 μm) formed from comparative oil 3 was obtained in the same manner as in Example 1, except that rice oil was replaced with cottonseed oil (comparative oil 3).

[0091] <Comparative Example 4> Comparative screw 4 having a layer (average film thickness 32 μm) formed from comparative oil 4 was obtained in the same manner as in Example 1, except that rice bran oil was replaced with camellia oil (comparative oil 4).

[0092] <Comparative Example 5> Comparative screw 5 having a layer (average film thickness 30 μm) formed from comparative oil 5 was obtained in the same manner as in Example 1, except that rice bran oil was replaced with soybean oil (comparative oil 5).

[0093] <Comparative Example 6> Comparative screw 6 having a layer (average film thickness 33 μm) formed from comparative oil 6 was obtained in the same manner as in Example 1, except that rice bran oil was replaced with olive oil (comparative oil 6).

[0094] Test example 1 (corrosion resistance test) The corrosion resistance test was conducted using the accelerated exposure corrosion life prediction test (FCK test method) developed by the Kansai Screw Cooperative Association and described in Patent No. 4471897, which is used to predict the service life of fastener hardware such as screws used to fasten roofs, exterior walls, etc. of building structures.

[0095] Specifically, a combined cycle testing machine SYP-90 (Suga Testing Machine) was used to test the metal components through the following steps (a) and (b); (a) spraying an aqueous solution (pH=4) containing 0.5 wt% NaCl and 0.1 wt% CaCl2 onto the component for 16 hours in air at 30 to 60°C; (b) leaving the component in air at 30 to 60°C for 8 hours; This is a method of repeatedly performing a combination of the above. In the following Test Example 1, the above steps (a) and (b) constitute one cycle, and the cycle is repeated for 10 or 15 cycles. Here, the test for 10 cycles is FCK Test Method A, and the test for 15 cycles is FCK Test Method B.

[0096] The FCK test method is said to produce results that are highly correlated with outdoor exposure tests. For example, a screw that develops red rust after 15 cycles of accelerated testing using the FCK test method can be estimated to develop red rust after 66 months in Osaka and 12 months in Omaezaki.

[0097] <Evaluation of the condition of red rust on the head of each screw> Ten screws each of the screws obtained in Example 1 and Comparative Examples 1 to 6 were prepared. Ten of each of the prepared screws were subjected to a corrosion resistance test using the FCK test method A (10 cycles) described in Test Example 1, and the state of red rust on the head of each screw was evaluated according to the following three-level scale. 0: No red rust 1: Red rust occurs on less than 50% of the surface area 2: Red rust occurs on 50% or more of the surface

[0098] <Corrosion resistance test evaluation> The scores for the red rust condition of the screw heads of the 10 screws obtained in the corrosion resistance test were totaled to determine a total value. The total value was then evaluated on a 5-point scale according to the following evaluation criteria. Less than 5:5 4:5 or more and less than 6 3:6 or more and less than 11 2:11 or more and less than 16 1:16 or more

[0099] Test Example 2 (Tapping torque test; maximum torque) Using the drill screws obtained in Example 1 and Comparative Examples 1 to 6, pilot holes were drilled into a C-shaped steel plate (without pilot holes) having a thickness of 2.3 mm, and then taps were inserted to form threads, and the tapping torque value until penetration was measured. Specifically, the mating member (C-shaped steel plate) was fixed, and the maximum torque (N·m) during tapping was measured using a torque analyzer (manufactured by Atonic Co., Ltd., product name: 20N·m torque analyzer). The tapping torque performance was evaluated on a 5-point scale based on the maximum torque value, as shown below.

[0100] <Evaluation of tapping torque test> 5: Less than 4.7N m 4: 4.7N m or more and less than 4.8N m 3: 4.8N·m or more and less than 5.0N·m 2: 5.0N m or more and less than 5.1N m 1:5.1N m or more

[0101] The screws obtained in Example 1 and Comparative Examples 1 to 6 were used to carry out FCK test method A (10 cycles) and Test Example 2 (tapping torque test) of the corrosion resistance test in Test Example 1. The total score of the evaluations in Test Example 1 (corrosion resistance test) and Test Example 2 (tapping torque test) was calculated, and an overall evaluation was made according to the following criteria. <Overall rating> 〇:6 or more ×: Less than 6

[0102] The results are shown in Table 1 below.

[0103] [Table 1]

[0104] <Result> Tapping torque rust inhibitors containing rice oil received high marks in both corrosion resistance tests and tapping torque tests compared to other vegetable oils (coconut oil, canola oil, cottonseed oil, camellia oil, soybean oil, and olive oil), and received an excellent overall rating.

[0105] (2) Anti-rust oil composition made by mixing tapping torque rust inhibitor and rust inhibitor: Study on types of tapping torque rust inhibitor (oil) <Example 2> 20 g of rice oil (manufactured by Tsuno Foods Industries Co., Ltd., product name: rice salad oil) and 10 g of a nitrogen-containing compound (manufactured by Cortec Co., Ltd., product name: VpCI-369) were mixed at room temperature to prepare a rust-preventive oil composition 2. The rice oil used contained 42% oleic acid, 36% linoleic acid, and 16% palmitic acid. Stainless steel screws (manufactured by Kokubu Co., Ltd., SUS410 drill screws were passivated (by Sakamoto Kogyo Co., Ltd.) to obtain screws. The rust-preventive oil composition 2 was placed in a beaker (45 mm x 78 mm) and heated to 35°C to obtain an oil composition. The 10 screws were placed in the beaker and immersed for 10 minutes. The screws were then placed in a basket. To adjust the film thickness, the removed screw was heated and centrifuged and dried in a centrifugal drying tank (manufactured by Kida Seiko Co., Ltd., product name: manual wax device) to obtain a screw 2 having a layer (average film thickness 33 μm) formed from the rust-preventive oil composition 2. The average film thickness is not particularly limited, but is usually in the range of 1 μm to 100 μm, preferably in the range of 10 μm to 75 μm, and more preferably in the range of 25 μm to 50 μm.

[0106] <Comparative Example 7> Comparative oil composition 7 was prepared in the same manner as in Example 2, except that rice bran oil was replaced with coconut oil. Comparative screw 7 having a layer (average film thickness 30 μm) formed from comparative oil composition 7 was then obtained in the same manner as in Example 2.

[0107] <Comparative Example 8> Comparative oil composition 8 was prepared in the same manner as in Example 2, except that rice bran oil was replaced with canola oil. Comparative screw 8 having a layer (average film thickness 33 μm) formed from comparative oil composition 8 was then obtained in the same manner as in Example 2.

[0108] <Comparative Example 9> Comparative oil composition 9 was prepared in the same manner as in Example 2, except that rice oil was replaced with cottonseed oil. Comparative screw 9 having a layer (average film thickness 36 μm) formed from comparative oil composition 9 was then obtained in the same manner as in Example 2.

[0109] <Comparative Example 10> A comparative oil composition 10 was prepared in the same manner as in Example 2, except that rice bran oil was replaced with camellia oil. A comparative screw 10 having a layer (average film thickness 32 μm) formed from the comparative oil composition 10 was then obtained in the same manner as in Example 2.

[0110] <Comparative Example 11> Comparative oil composition 11 was prepared in the same manner as in Example 2, except that rice bran oil was replaced with soybean oil. Comparative screw 11 having a layer (average film thickness 30 μm) formed from comparative oil composition 11 was then obtained in the same manner as in Example 2.

[0111] <Comparative Example 12> A comparative oil composition 12 was prepared in the same manner as in Example 2, except that rice bran oil was replaced with olive oil. A comparative screw 12 having a layer (average film thickness 33 μm) formed from the comparative oil composition 12 was then obtained in the same manner as in Example 2.

[0112] The screws obtained in Example 2 and Comparative Examples 7 to 12 were used to carry out FCK test method A (10 cycles) and Test Example 2 (tapping torque test) of the corrosion resistance test in Test Example 1. The total score of Test Example 1 (corrosion resistance test) and Test Example 2 (tapping torque test) was calculated, and an overall evaluation was made according to the following criteria. <Overall rating> ◎: 10 or more ○: More than 8 and less than 10 △: More than 6 and less than 8 ×:6 or less

[0113] The results are shown in Table 2 below. 1 shows a photograph of the screw obtained in Example 2 after the corrosion resistance test. FIG. 2 shows a photograph of the screw obtained in Comparative Example 8 after the corrosion resistance test.

[0114] [Table 2]

[0115] <Result> The rust-preventive oil composition of Example 2, which contains a tapping torque rust inhibitor containing rice oil and a rust inhibitor, had superior overall evaluations in the corrosion resistance test and tapping torque property test compared to the comparative oil compositions of Comparative Examples 7 to 12, which contain a vegetable oil other than rice oil and a rust inhibitor.

[0116] (3) Anti-rust oil composition mixed with tapping torque anti-rust agent and anti-rust agent: Study of types of anti-rust agent <Example 3> A screw 3 having a layer formed from a tapping torque rust inhibitor containing rice oil and a rust-preventive oil composition 2 containing a nitrogen-containing compound was obtained in the same manner as in Example 2, except that the material of the sample was changed to Hardtech (stainless steel screw, manufactured by Kokubu Co., Ltd.).

[0117] <Example 4> A rust-preventive oil composition 4 was prepared in the same manner as in Example 2, except that the nitrogen-containing compound was replaced with 0.1 g of a fatty acid ester compound 1 (manufactured by Riken Vitamin Co., Ltd., product name: Poem O-80V (sorbitan fatty acid ester), HLB approximately 4.9). Then, a screw 4 having a layer formed from the rust-preventive oil composition 4 was obtained in the same manner as in Example 3.

[0118] <Example 5> A rust-preventive oil-and-fat composition 5 was prepared in the same manner as in Example 2, except that the nitrogen-containing compound was replaced with 0.1 g of a fatty acid ester compound 2 (manufactured by Riken Vitamin Co., Ltd., product name: Poem G-002 (glycerin fatty acid ester)). Then, a screw 5 having a layer formed from the rust-preventive oil-and-fat composition 5 was obtained in the same manner as in Example 3.

[0119] <Example 6> An antirust oil composition 6 was prepared in the same manner as in Example 2, except that the nitrogen-containing compound was replaced with 1.0 g of a phosphoric acid ester compound (manufactured by Chelest Co., Ltd., product name: Cheleslite P-18C). Then, a screw 6 having a layer formed from the antirust oil composition 6 was obtained in the same manner as in Example 3.

[0120] <Example 7> Except for replacing the nitrogen-containing compound with persimmon tannin, a rust-preventive oil-and-fat composition 7 was prepared in the same manner as in Example 2. Then, a screw 7 having a layer formed from the rust-preventive oil-and-fat composition 7 was obtained in the same manner as in Example 3.

[0121] The screws obtained in Examples 3 to 7 were used to carry out the FCK test method B (15 cycles) and Test Example 2 (tapping torque test) of the corrosion resistance test in Test Example 1. The total score of the evaluations in Test Example 1 (corrosion resistance test) and Test Example 2 (tapping torque test) was calculated. The results are shown in Table 3 below.

[0122] [Table 3]

[0123] <Result> The tapping torque rust inhibitor containing rice oil and the rust-preventive oil and fat compositions containing the rust inhibitor of Examples 3 to 7 all received high evaluations in the corrosion resistance test and the tapping torque test. Among them, the tapping torque rust inhibitor containing rice oil and the rust-preventive oil and fat composition of Example 3 containing a nitrogen-containing compound as a rust inhibitor received the highest total evaluation points in the corrosion resistance test and the tapping torque test.

[0124] (4) Testing for damaged screws <Example 8> A screw 8 having a layer formed from a tapping torque rust inhibitor containing rice oil and a rust-preventive oil composition 2 containing a nitrogen-containing compound was obtained from Hardtech (manufactured by Kokubu Co., Ltd., SUS410-stainless steel screw) in the same manner as in Example 2. Then, assuming misalignment due to vibration or external force that may occur during transportation of the screw, about 30% of the screw volume was placed in a small screw box (80×130×110), and the box was shaken 180 times for about 3 minutes to give vibration, and a damaged screw 8 was obtained.

[0125] <Example 9> A rust-preventive oil composition 4 was prepared in the same manner as in Example 2, except that the nitrogen-containing compound was replaced with 0.1 g of a fatty acid ester compound 1 (manufactured by Riken Vitamin Co., Ltd., product name: Poem O-80V (sorbitan fatty acid ester), HLB 4.3). Then, a scratched screw 9 having a layer formed from the rust-preventive oil composition 4 was obtained in the same manner as in Example 8.

[0126] <Example 10> An antirust oil composition 5 was prepared in the same manner as in Example 2, except that the nitrogen-containing compound was replaced with 0.1 g of a fatty acid ester compound 2 (manufactured by Riken Vitamin Co., Ltd., product name: Poem G-002 (glycerin fatty acid ester), HLB 7.0). Then, a scratched screw 10 having a layer formed from the antirust oil composition 5 was obtained in the same manner as in Example 8.

[0127] <Example 11> An antirust oil composition 6 was prepared in the same manner as in Example 2, except that the nitrogen-containing compound was replaced with 1.0 g of a phosphoric acid ester compound (manufactured by Chelest Corporation, product name: Cheleslite P-18C). Then, a scratched screw 11 having a layer formed from the antirust oil composition 6 was obtained in the same manner as in Example 8.

[0128] <Example 12> Except for replacing the nitrogen-containing compound with persimmon tannin, a rust-preventive oil-and-fat composition 7 was prepared in the same manner as in Example 2. Then, a scratched screw 12 having a layer formed from the rust-preventive oil-and-fat composition 7 was obtained in the same manner as in Example 8.

[0129] The damaged screws obtained in Examples 8 to 12 were subjected to the FCK test method B (15 cycles) and Test Example 2 (tapping torque test) of the corrosion resistance test of Test Example 1. The total score of the evaluation points of Test Example 1 (corrosion resistance test) and Test Example 2 (tapping torque test) was calculated. The results are shown in Table 4 below.

[0130] [Table 4]

[0131] <Result> The tapping torque rust inhibitor containing rice oil and the rust-preventive oil and fat compositions containing the rust inhibitor of Examples 8 to 12 all received high evaluations in the corrosion resistance test and tapping torque test on damaged threads. Among them, the tapping torque rust inhibitor containing rice oil of Example 8 and the rust-preventive oil and fat composition containing a nitrogen-containing compound received the highest total evaluation points in the corrosion resistance test and tapping torque test on damaged threads, and no deterioration was observed in the threads even after the corrosion resistance test.

Claims

1. A rust-preventive oil and fat composition comprising rice bran oil and further a rust inhibitor, The rust-preventive oil composition, wherein the rust inhibitor comprises an imidazole-based compound.

2. The rice oil contains oleic acid and linoleic acid, 2. The rust-preventive oil composition according to claim 1, wherein the content of the linoleic acid is 20 to 100 parts by mass per 100 parts by mass of the oleic acid.

3. The rust-preventive oil composition according to claim 1, wherein the content of the imidazole compound is 0.05 to 1 part by mass per 100 parts by mass of the rice bran oil.

4. A lubricating oil composition containing the rust-preventive oil composition according to any one of claims 1 to 3.

5. A metal fastening member having a layer formed from the rust-preventive oil composition described in any one of claims 1 to 3.

6. A screw having a layer formed from the rust-preventive oil composition described in any one of claims 1 to 3.

7. A topcoat agent for screws comprising the rust-preventive oil composition according to any one of claims 1 to 3.

8. An anti-galvanic corrosion agent comprising the rust-preventive oil composition described in any one of claims 1 to 3.

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