201142012 六、發明說明： c發明戶斤屬之技術領域3 發明領域 本發明係有關於使用在軋延等之金屬加工用潤滑油組 成物。 L· 發明背景 當進行金屬材料之軋延時，軋延板已通過之部分的作 業輥上，會產生以固定色調著色的所謂輥鍍之現象。由於 作業輥常時直接接觸軋延板，因此該糙鍵對軋延性或軋延 製品表面性狀會造成莫大影響。例如，在不鏽鋼的冷軋方 面’由於軋延前步射的退火紐洗淨難成的晶界狀網 目狀花樣會將光漫散反射，致使板光澤度降低。這種情況 下，就必須在冷軋時除去前述網目花紋使板光澤度提升。 此種作用乃是藉由輥鍍之生成所能完成的，於是，在寬度 方向使均句的輥鍍生成一事，就表面品質而言是非常重要 的（文獻1 :參考⑽等「軋延材料表面對_生成與表面 光澤帶來的影響」；第47回塑性加工聯合演講會； P281-282;1996)。又，在精加卫軋延步驟上，係將表面粗 度大的輥更換成精加工用的表面粗度小的輥。因此，精加 工軋延乃是從無輥鍍之狀態開始，到_生成之前板光澤 度偏低。隨之，絲料成得慢，則軋延板的成品率低， =上生產性也低落不彰。因此，在作_表面生成親鑛 不僅可賦予軋延板高度光澤，且從生產性觀點來看也是屬 201142012 於很理想的現象。 ’彖此在金屬材料的軋延上，係尋求作業輥表面迅速 生成輥鑛’而乾延油的選定就變得很重要。又作為乳延 油係要求m佳，亦即可以低軋延荷重獲得高壓下率， 且在嚴酷條件下不產生燒結（熱職)也很重要。尤其在不痛 鋼的冷乳巾，基於材料為硬質故*對軋延油亦要求对燒始 性，進一步基於其用途，故材料表面的匠心性也很重要， 對板光澤度高的要求也頗為強烈。 於疋，已有提案一種不鏽鋼用冷軋油，係含有由碳原 子數6〜10之脂肪族直鏈二羧酸與碳原子數3〜5之醇所構成 的一酯者（參考文獻2 :日本特開2001-240884號公報）。另 外，也有提案-種冷軋油組成物，係含有主骨架為碳原子 數12〜28之脂肪族二羧酸與碳原子數丨〜9之脂肪族醇所獲得 的二酯〇.5〜30質量％及磷系化合物0.01〜5.0質量％者（參考 文獻3 : W02003/097774號說明書）。 然而，文獻2所§己載的不鏽鋼用冷軋油，非惟觀鍍生成 上有很長的軋延距離，且咐燒結性也稱不上足夠。又，文 獻3所5己載的冷軋油組成物方面，雖然耐燒結性獲得認可， 然而在輥鍍生成上仍需要些許軋延距離。 L發明内容】 ^ 發明概要 本發明之目的係提供一種可在短軋延距離賦予軋延板 咼光澤，且耐燒結性亦優異的金屬加工用潤滑油組成物。 爲了解決前述課題，本發明係提供如下的金屬加工用 4 201142012 潤滑油組成物。 [1] 一種金屬加工用潤滑油組成物，其特徵在於：係於 基油中摻混以下述式（1)表示的二酯化合物而成者； R'OCO-Z-COOR2 (1) (式中，R1、R2各自獨立為碳原子數1以上且18以下的 烷基；Z為碳原子數10以上且12以下的伸烷基）。 [2] 如上述金屬加工用潤滑油組成物，其中前述式（1)中 之Z為直鍵結構。 [3] 如上述金屬加工用潤滑油組成物，其中前述式（1)中 的二酯化合物之摻混量以組成物全量基準計係0.1質量％以 上且30質量％以下。 [4] 如上述金屬加工用潤滑油組成物，其中更摻混了油 性劑。 [5] 如上述金屬加工用潤滑油組成物，該組成物係供冷 軋用。 [6] 如上述金屬加工用潤滑油組成物，該組成物係供不 鏽鋼用。 本發明之金屬加工用潤滑油組成物，係於基油中摻混 了預定二酯化合物而成者，故耐燒結性優異，同時可在短 軋延距離賦予軋延板高光澤。因此，在用作不鏽鋼等硬金 屬材料之冷軋上至為有用。 L實施方式：！ 用以實施發明之形態 本發明之金屬加工用潤滑油組成物（以下亦僅略稱為 201142012 「本組成物」）中，作為基油者可使用礦物油或合成油之任 一種。 礦物油方面，可舉出各種礦物油。例如：將石壤爲系 原油、中間基系原油或環烷基系原油予以常壓蒸餾、或將 常壓蒸餾之殘渣油予以減壓蒸餾所獲得的蒸餾油、或者是 將之藉常法精製而獲得的精製油，可舉例如溶劑精製油、 氫化精製油、脫臘處理油、及白土處理油等。 又，合成油方面，玎採用碳原子數8到14的聚α_烯烴 (Ρ〇Α)、烯烴共聚物(〇CP，例如乙烯-丙烯共聚物等）、或聚 丁烯、聚丙烯等支鏈烯烴或該等的氫化物、甚且是聚醇酯 (二經曱丙烷之脂肪酸酯、新戊四醇之脂肪酸酯等）等的自旨系 化合物、烧基笨等。 本發明中，可使用1種前述之礦物油或合成油作為基 油，亦可合併使用2種以上作為基油。也可以將礦物油與合 成油混合使用。 作為這種基油者，係以4〇t時的動黏度在丨爪一以至 3〇mm/s之範圍者為佳，在4mm2/s至2〇mm2/s之範圍者更 佳。該動黏度低於lmm2/s時則閃點偏低，因閃火造成火災 等的危險性恐會增加，另-方面，若超過3Gmm2/s時則札 延板表面會產生油孔而致使綺度低，也有發生捲繞滑移 等不順利情況之虞。 本組成物係對前述基油摻混以下述式（1)表示的二酯化 合物而成者。 R^CO-Z-COOR2 (1) 201142012 此處，式中，R1、R2係各自獨立為碳原子數〖以上且18 以下的烧基。R1或R2的碳原子數若在19以上，恐有軋延板 的光澤偏低之虞。又，自耐燒結性的觀點來看，Ri或R2的 碳原子數係以4以下為佳，尤其以尺1及R2的碳原子數皆在4 以下為佳。這種烷基可舉甲基、乙基、丙基、丁基，而丙 基或丁基係直鏈狀或支鏈狀皆可。該等之中，在财燒結性 這點上，最為理想者係R1及R2皆為甲基之情況。 上述式（1)中’ Z係碳原子數1〇以上且12以下的仲烧 基。若屬於Z的碳原子數在該範圍的伸烧基，則对燒結性良 好，軋延時輥鍵易於生成，軋延板的光澤也可變良好。z 無論是直鏈或具有支鏈皆可，而以直鏈在光澤賦予這點上 較佳。又，基於耐燒結性與輥鍍生成的觀點，係以z的碳原 子數為10、且R1及R2皆為甲基之情況最佳。 本組成物中，以式（1)表示的二酯之摻混量，基於耐燒 結性及⑽易於生成的觀點，以組成物全量基準計係〇1質 量二以上且40質量％以下為佳。該二@|的較佳摻混量以組成 王星基準计係1質量％以上且3〇質量0/。以下，更佳係1質量 、上且20質量。/。以下，甚佳係3質量。以上且2〇質量％以 下。 、' 本組成物中，宜進一步摻混油性劑。可適當採用單酯 或阿級醇作為本組成物中所摻混的油性劑。 ^早酯方面以碳原子數13以上48以下的單酯為佳。藉由 單酗與上述式（1)的二酯組合使用，可使耐燒結性與軋 延板的光澤進-步提升。又，藉由換混該單，亦可使上 201142012 述二酯的使用量降低。 作為這種單醋者可舉例如以下述式⑺表示的脂肪族單 敌酸酯。 + R3COOR4 (2) 此處’式中’ R3係表示碳原子數11以上且如下的尸 基，R4係麵韻子數⑽上且加下的絲， 計碳原子數在12以上且47以下。 σ 以式⑺表示的單酉旨之較佳碳原子數係在U以上且％以 下的範圍。該單酯的具體例，可適當舉出硬脂酸甲酯、硬 脂酸丁 S旨、硬脂酸辛g旨、棕橺酸辛§|等，而鱗之中，基於 有助於魏結性之點及取祕之觀點，仙硬脂酸丁=最 佳。 a 本組成物中，可使用1種上述單酯，亦可合併使用2種 以上。又，軋延油組成物中該單酯的摻混量以組成物全量基 準計係0.5質量％以上且4〇質量％以下的範圍為佳，3質量％ 以上且30質量％以下的範圍較佳，尤其5質量％以上且如質 量％以下的範圍最佳，單S旨㈣混量若超過4 Q f量％，則 恐有發生軋親滑移之虞’並且’亦有低溫流動性惡化之虞。 作為高級醇者’基於耐燒結性之點，係以碳原子數12 以上且18以下的醇為佳L言，可例舉各種飽和醇或 不飽和醇，飽和醇、不飽和醇皆可良好地使用。作為這種 飽和醇者，可舉錢或讀狀十二醇(例如㈣醇）、直鍵或 支鏈狀十三醇、錢或姨狀十，、錢或支鏈狀十五 醇、直鏈或支鏈狀十六醇、以及該等的混合物等。 8 201142012 為不飽和醇者，可舉直鏈狀或支鍵狀十稀醇、 或支鏈狀十—烯醇、直鏈㈣支鏈狀十二稀醇、直 鏈狀或支鏈狀+二、咕缺 、 —締知、直鏈狀或支鏈狀十四烯醇、直鏈 、’支鏈狀十五;醇、直鏈狀或支鏈狀十六稀醇、直鏈狀 3、支鏈狀十场醇、直鏈狀或支鏈狀十人稀醇等。 •成物中摻思上述高級醇之情況時的比例並益特別 ，定’不過自耐燒結性之點，以組成物全量基準計係i質量 〆〇以上且20質詈。/ ,、， 。下，以2質量％以上且15質量％以下為 以3質里%以上且12質量%以下更佳。 在不阻礙發明效果之範圍内’亦可對本城物摻混以 特厭才,各種添加劑。具體而言，可適當摻混界面活性劑、 乃月^磨耗劑、抗氧化劑、防鏽劑、金屬不活性化劑、 及消泡劑等來使用。 卜14韻、用於將本組成物分散於水巾作成乳劑使 劑、陽離付ΐΐ 财可舉糾°_子性界面活性 活性劑、非離子性界面活性劑、及兩性 略梳Γ等。陰離子性界面活性劑方面，有苯石黃酸炫基 r甲==㈣等子性界面活性财面，有烧基 面活性♦丨方二曱錢鹽等的四級錢鹽I非離子性界 笨基料_ ’。料魏基m雜基烧基 #0 >此里以組成物全量基準計係宜在0.01質 里/。以上、1〇質量%以下的範圍選定。 聚芳狀^劑者’可舉例如硫化馳、二院基聚硫化物、 "匕物、一芳基聚硫化物等的硫磺系化合物、 201142012 磷酸酯、硫代磷酸酯、亞磷酸酯、烷基亞磷酸氫鹽、磷酸 醋胺鹽、亞磷酸酯胺鹽等的磷系化合物等。又，其摻混量 以組成物全量基準計係宜在〇〇1質量％以上且10質量％以 下’較佳係可在〇.〇5質量％以上且5質量。/。以下的範圍選定。 作為抗磨耗劑者，可舉例如二硫代磷酸鋅(ZnDTP)、二 硫胺曱酸辞(ZnDTC) '硫化氧基二硫代磷酸鉬（MoDTP)、硫 化氧基二硫胺甲酸鉬（MoDTC)等。又，其摻混量以組成物 全量基準計以在〇_1質量。/。以上且5質量％以下的範圍選定 為佳。 作為抗氧化劑者，可舉例如烷基化二苯胺、苯_α_萘胺、 烷基化-α-萘胺等的胺系、2,6_二三級丁基_對甲酚等的酚 系、及2,6-二-三級丁基_4_[4,6_雙（辛基硫)三畊_2_基 胺基]酚、硫二丙酸二月桂酯等的硫磺系等。又，其摻混量 以組成物全量基準計宜為0 05質量％以上且3質量％以下， 較佳為在0.2質量％以上且2質量％以下的範圍選定即可。 作為防鏽劑者，可例舉：如三乙醇胺之烷醇胺、石油 磺酸鹽、烷基笨磺酸鹽、萘磺酸二壬酯、琥珀酸烯基酯、 及多元醇酯等。該等防鏽劑之摻混量，基於摻混效果之點， 以組成物全量基準計宜為〇.〇!質量。/〇以上且丨質量％以下， 較佳為在〇.〇5質量％以上且0.5質量％以下的範圍選定即可。 作為金屬不活性化劑者，可例舉笨并三唑系、甲苯基 二唑系、噻二唑系、及咪唑系化合物等。又，其掺混量係 基於摻混效果之點，以組成物全量基準計宜在〇 〇1質量％以 上且1質量％以下，較佳為在〇.〇1質量％以上且〇5質量％以 10 201142012 下的範圍選定即可。 作為消泡劑者’可舉例如錢烧、氟魏醇、及氟炫基 崎。消泡劑係基於消泡效果及經濟性之平解點，以组絲 h基準計宜在讀5質量％以上且〇」質量％以下的範圍選 定。 本發明之金屬加工用潤滑油組成物，可在短軋延距離 賦予軋延板高度光澤，且耐—佳，故而尤其適於作為 似不鏽鋼這般堅硬、軋延板表面匠讀高的金屬材料之冷 軋油來使用。 [實施例] 、接著，藉由實施例進-步詳細說明本發明，惟本發明 並非受限於該等例子。 [貫施例1至7、比較例1至5] (1)試料油的調製 …調製具有表卜表2所示之摻混組成的軋延油（試料油）， 進行藉軋延機所致之軋延實驗。 在此，用於試料油之調製的各成分如下。 (U)基油：採用4〇<t動黏度為7mm2/s與30mm2/s的2種 蠛基系礦物油，聽轉礦物油之摻混比率以使4〇。〇動 黏度成為8mm2/s。 aqu式⑴之二§旨中’ Rl、r2皆為甲基，z為碳 原子數10的直鏈伸絲(十二I酸二甲醋）。 (1.3)二§旨2:式⑴之二㈣，r,、r2皆為甲基，z為碳 原子數12的直鏈伸絲(十四 201142012 (1.4)二酯3 :由以下化學式表示的脂肪族二羧酸之二 曱酉旨。 hooc-(ch2)6-c=ch-(ch2)2-ch=c(ch2)6-cooh ch3 ch3 (1_5)二酯4 :己二酸二異壬酯 (1.6) 二酯5 :己二酸二異癸酯 (1.7) 三酯：苯三甲酸與辛醇的三酯 (1.8)油性劑：月桂醇、硬脂酸丁酯（丁基硬脂酸酯） [表1] 實施例 1 2 3 4 5 6 7 摻混組成 (質量％) 基油 剩餘 部分 剩餘 部分 剩餘 部分 剩餘 部分 剩餘 部分 剩餘 部分 剩餘 部分 二酯1 5 10 30 5 - - 5 二酯2 - - - 10 5 - 二酯3 - - - - - - - 二酯4 - - - - - - - 二酯5 - - - - - - - 三酯 - - - - - 麵 - 月桂醇 - - - - - - 5 硬脂酸丁酯 - - - 15 - 15 - 評價結果 熱刮痕發生 壓下率(％) 35 40 43 39 42 41 38 軋延距離 30 35 40 35 40 45 30 12 201142012 [表2] 比較你 1 2 3 4 5 基油 剩餘 剩餘 剩餘 剩餘 剩餘 部分 部分 部分 部分 部分 二酯1 - - _ — • 二酯2 - - _ 推混組成 二酯3 10 10 _ _ _ (質量％) 二酯4 - - r 1〇 _ 二醋5 - - 10 _ 三酯 - _ 10 月桂醇 - - _ _ - 硬脂酸丁酯 5 鲁 熱刮痕發生 — 評價結果 壓下率(％) 43 44 34 36 35 乾延距離 80 85 180 >300 >300 (2)軋延實驗 (2.1) 财燒結性(财熱到痕性)之評價 在表3中所示之軋延條件下，進行軋延實驗。具體而言， 係將厚度l.Smm之SUS304(2B)材以4道次軋延成〇67mm，在第 5道次將壓下率從14.9%逐步提升，求取在軋延板表面開始發 生熱刮痕之壓下率。 (2.2) 光澤性評價 ▲在表4中所示之道次排程條件下，進行乳延實驗。具體而 言，係在第3道次的軋延後以每5m採取板樣本。接著，求取樣 本板的光澤依2G度光澤(準據ASTM⑽)超過_時的札延 距離。該軋延距離愈短，即視為輥鍍之生成愈快。 又，在本實驗中，於實驗所使用的軋延 作隹:軸卞及马1mm且 祕的表面粗輪Ra為0.03μιη’此係與(2·1)的實驗不同。 13 201142012 [表3] 軋延條件 _ 軋延機 - 4段可逆式軋延機 作業輥 尺寸 T40x200mm 材質 SUJ-2 硬度 Hs95 粗Μ Ra 0.05μιη 備用輥 尺寸 Ψ200χ200ηκη 軋延材 材質 SUS304(2B、0材） 尺寸 1.5tx50Wmmx 線圈 抗拉伸力 702N/mm2 供油法 油溫 40°C 供油量 13L/min 僅入側之單側供油 [表4] 道次 No. 目標 板厚 (mm) 壓下率 (%) 軋延速度 (m/min) 張力（kN) 備考 入側 出側 0 1.000 - - 原板 1 0.800 20.0 100 9.0 9.0 定常軋延 2 0.620 22.5 100 7.0 7.0 3 0.500 19.4 100 5.7 5.7 (3)評價結果 從表1可得知’實施例1至7的試料油係摻混預定的二酿而 成，因此可在短軋延距離發揮優異光澤，而且耐燒結性(耐熱 刮痕性)也堪稱優異。相對於此，比較例1至4的試料油，由於 所摻混的二酯結構與本發明之二酯相異，因此在欲獲得良好 光澤上需要頗長的軋延距離。另外，比較例5中由於摻混的酯 為三酯，因此同樣需要頗長的軋延距離方可獲得良好光澤。 【圖式簡專_說^明】 (無） 【主要元件符號說明】 (無） 14201142012 VI. Description of the Invention: C TECHNICAL FIELD OF THE INVENTION The present invention relates to a lubricating oil composition for metal working which is used for rolling or the like. L. Background of the Invention When a rolling delay of a metal material is performed, a so-called roll plating phenomenon in which a color tone is colored is generated on a part of the work roll through which the rolled sheet has passed. Since the work rolls often come into direct contact with the rolled sheet, the rough bond has a great influence on the rolling property or the surface properties of the rolled product. For example, in the cold-rolled side of stainless steel, the grain boundary-like pattern which is difficult to form due to the annealing of the pre-rolling step will diffuse the light, resulting in a decrease in the gloss of the sheet. In this case, it is necessary to remove the aforementioned mesh pattern during cold rolling to increase the gloss of the board. This effect can be achieved by the formation of roll plating, so that the roll forming of the uniform sentence in the width direction is very important in terms of surface quality (Reference 1: Reference (10), etc. The effect of surface on _ generation and surface gloss"; 47th plastic processing joint lecture; P281-282; 1996). Further, in the step of finishing the rolling, the roll having a large surface roughness is replaced with a roll having a small surface roughness for finishing. Therefore, the finishing rolling is started from the state of no roll plating, and the gloss of the board is low until the generation of _. As a result, the yarn becomes slower, and the yield of the rolled sheet is low, and the productivity is also low. Therefore, the production of pro-minerals on the surface can not only impart a high gloss to the rolled sheet, but also is an ideal phenomenon from the viewpoint of productivity in 201142012. Therefore, in the rolling of metal materials, it is important to seek the rapid formation of roll ore on the surface of the work rolls, and the selection of dry oil is important. It is also required as a milk extension oil system, that is, it is possible to obtain a high pressure rate with a low rolling load, and it is also important to produce no sintering under hot conditions. Especially in the cold milk wipes of the non-pain steel, the material is hard. Therefore, the rolling properties are also required for the rolling oil, and further based on its use, the ingenuity of the material surface is also important, and the requirements for high gloss of the board are also Quite strong. Yu Yu, has proposed a cold-rolling oil for stainless steel, which is an ester composed of an aliphatic linear dicarboxylic acid having 6 to 10 carbon atoms and an alcohol having 3 to 5 carbon atoms (Reference 2: Japanese Patent Laid-Open Publication No. 2001-240884). In addition, there is also proposed a cold-rolling oil composition comprising a diester oxime obtained by an aliphatic dicarboxylic acid having a main skeleton of 12 to 28 carbon atoms and an aliphatic alcohol having a carbon number of 丨 ～9. The mass% and the phosphorus compound are 0.01 to 5.0% by mass (Reference 3: Specification No. WO2003/097774). However, the cold-rolled oil for stainless steel, which is contained in the literature 2, has a long rolling distance on the non-existing plating, and the sinterability is not sufficient. Further, in the case of the cold-rolling oil composition of the five contained in the literature, although the sinter resistance is recognized, a certain rolling distance is required in the roll forming. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION An object of the present invention is to provide a lubricating oil composition for metal working which can impart a gloss to a rolled sheet at a short rolling distance and which is excellent in seizure resistance. In order to solve the above problems, the present invention provides the following lubricant composition for metal working 4 201142012. [1] A lubricating oil composition for metal working, characterized in that a diester compound represented by the following formula (1) is blended in a base oil; R'OCO-Z-COOR2 (1) In the above, each of R1 and R2 is independently an alkyl group having 1 or more and 18 or less carbon atoms; and Z is an alkylene group having 10 or more and 12 or less carbon atoms. [2] The lubricating oil composition for metal working according to the above, wherein Z in the above formula (1) is a direct bond structure. [3] The lubricating oil composition for metal working according to the above formula (1), wherein the blending amount of the diester compound is 0.1% by mass or more and 30% by mass or less based on the total amount of the composition. [4] A lubricating oil composition for metal working as described above, wherein an oily agent is further blended. [5] The lubricating oil composition for metal working as described above, which is used for cold rolling. [6] The lubricating oil composition for metal working as described above, which is used for stainless steel. Since the lubricating oil composition for metal working of the present invention is obtained by blending a predetermined diester compound with a base oil, it is excellent in seizure resistance and can impart high gloss to the rolled sheet at a short rolling distance. Therefore, it is useful for cold rolling which is used as a hard metal material such as stainless steel. L implementation:! MODE FOR CARRYING OUT THE INVENTION In the lubricating oil composition for metal working of the present invention (hereinafter also referred to simply as "the present composition" in 201142012), any of mineral oil or synthetic oil may be used as the base oil. As for the mineral oil, various mineral oils can be mentioned. For example, the distillation oil obtained by subjecting the rocky soil to a crude oil, an intermediate base crude oil or a naphthenic crude oil by atmospheric distillation or a residual oil of atmospheric distillation to a vacuum distillation, or refining it by a conventional method The refined oil obtained may, for example, be a solvent refined oil, a hydrogenated refined oil, a dewaxed oil, or a clay treated oil. Further, in terms of synthetic oil, a poly-α-olefin having a carbon number of 8 to 14 or an olefin copolymer (〇CP, for example, an ethylene-propylene copolymer) or a polybutene or a polypropylene is used. An alkene or such a hydride, or a polyvalent alcohol ester (a fatty acid ester of a fluorene-propane-propane, a fatty acid ester of neopentyl alcohol, etc.), etc. In the present invention, one type of the above-mentioned mineral oil or synthetic oil may be used as the base oil, or two or more types may be used in combination as the base oil. It is also possible to mix mineral oil with synthetic oil. As such a base oil, the dynamic viscosity at 4 Torr is preferably in the range of 1 to 3 mm/s, and preferably in the range of 4 mm 2 /s to 2 〇 mm 2 /s. When the dynamic viscosity is lower than lmm2/s, the flash point is low, and the risk of fire due to flash fire may increase. On the other hand, if it exceeds 3Gmm2/s, oil holes may be generated on the surface of the sheet. The degree is low, and there are also cases where winding and slipping are not smooth. This composition is obtained by blending a diester compound represented by the following formula (1) with the base oil. R^CO-Z-COOR2 (1) 201142012 Here, in the formula, each of R1 and R2 is independently a group having a carbon number of 〖above and 18 or less. If the number of carbon atoms of R1 or R2 is 19 or more, there is a fear that the gloss of the rolled sheet is low. Further, from the viewpoint of resistance to sinterability, the number of carbon atoms of Ri or R2 is preferably 4 or less, and particularly preferably, the number of carbon atoms of the scale 1 and R2 is 4 or less. Such an alkyl group may be a methyl group, an ethyl group, a propyl group or a butyl group, and a propyl group or a butyl group may be linear or branched. Among these, in the case of the smelting property, it is preferable that both of R1 and R2 are methyl groups. In the above formula (1), the "Z" is a secondary alkyl group having 1 or more carbon atoms and 12 or less carbon atoms. If the number of carbon atoms belonging to Z is in the range of the stretching group, the sinterability is good, the rolling time-delay roll bond is easily formed, and the gloss of the rolled sheet can be changed well. z Whether it is a straight chain or a branch, it is preferable to give a straight chain in gloss. Further, from the viewpoints of the sinter resistance and the formation of the roll plating, it is preferable that the number of carbon atoms of z is 10 and both of R1 and R2 are methyl groups. In the present composition, the blending amount of the diester represented by the formula (1) is preferably two or more and 40% by mass or less based on the total amount of the composition, based on the resistance to sintering and (10). The preferred blending amount of the two @| is 1% by mass or more and 3 〇 mass 0/ of the composition of the king star. Hereinafter, it is more preferable to have 1 mass and 20 masses. /. Below, very good is 3 quality. Above and below 2% by mass. , 'In this composition, it is advisable to further blend an oily agent. A monoester or a tertiary alcohol can be suitably used as the oily agent blended in the present composition. In the case of the early ester, a monoester having 13 or more and 48 or less carbon atoms is preferred. By using a single oxime in combination with the diester of the above formula (1), the sinter resistance and the gloss of the rolled sheet can be further improved. Moreover, by changing the order, the amount of the diester used in the above 201142012 can also be lowered. As such a mono- vinegar, for example, an aliphatic monocarboxylic acid ester represented by the following formula (7) can be mentioned. + R3COOR4 (2) Here, R3 is a cadaveric group having 11 or more carbon atoms and the number of carbon atoms in the R4 system having a number of rhyme numbers (10) of 12 or more and 47 or less. σ The preferred number of carbon atoms represented by the formula (7) is in the range of U or more and % or less. Specific examples of the monoester include methyl stearate, butyl succinate, stearic acid succinate, palmitic acid s §|, etc., and scales are based on Point and secret point of view, stellate stearic acid = best. a The above-mentioned monoester may be used alone or in combination of two or more. In addition, the blending amount of the monoester in the rolling oil composition is preferably 0.5% by mass or more and 4% by mass or less based on the total amount of the composition, and preferably 3% by mass or more and 30% by mass or less. In particular, the range of 5 mass% or more and the mass % or less is the best, and if the amount of the single S (4) is more than 4% by weight, the rolling slip may occur and the low temperature fluidity may be deteriorated. Hey. It is preferable that an alcohol having a carbon number of 12 or more and 18 or less is used as a high-grade alcohol, and various saturated or unsaturated alcohols can be exemplified, and saturated alcohols and unsaturated alcohols can be satisfactorily used. use. As such a saturated alcohol, it can be money or read dodecanol (such as (tetra) alcohol), direct or branched thirteen alcohol, money or scorpion, ten, money or branched fifteen alcohol, linear Or branched cetyl alcohol, mixtures of these, and the like. 8 201142012 It is an unsaturated alcohol, which may be a linear or branched sterol, or a branched de-enol, a linear (tetra) branched di-lower alcohol, a linear or branched chain + two , lacking, - known, linear or branched tetradecenol, linear, 'branched fifteen; alcohol, linear or branched hexadecanol, linear 3, branch Chain-like ten-field alcohol, linear or branched ten-membered dilute alcohol, and the like. • The ratio in the case where the above-mentioned higher alcohol is blended in the product is particularly advantageous, and it is determined from the point of resistance to sinterability, and is based on the total amount of the composition, i mass 〆〇 or more and 20 詈. / ,,, . In the case of 2 mass% or more and 15 mass% or less, it is more preferably 3 mass% or more and 12 mass% or less. In the range that does not impede the effect of the invention, it is also possible to blend the city with special additives and various additives. Specifically, a surfactant, an anthraquinone agent, an antioxidant, a rust inhibitor, a metal inactivating agent, an antifoaming agent, or the like can be appropriately blended.卜14 rhyme, used to disperse the composition in a water towel to form an emulsion agent, and the cations can be used to correct the __ sexual interface active agent, nonionic surfactant, and amphoteric sputum. In terms of anionic surfactants, there are phenanthroic acid sulfonyl r-A == (four) iso-interface interfacial active noodles, and there are four-stage salt I non-ionic boundaries such as roasting surface activity ♦ 丨方二曱钱盐Stupid base _ '. The material Weiqi m hetero-base burning base #0 > here is based on the total composition of the composition should be within 0.01 mass /. The range of the above and 1% by mass or less is selected. Examples of the poly-aromatic agent include sulfur-based compounds such as vulcanization, second-yard polysulfide, "salt, monoaryl polysulfide; 201142012 phosphate, phosphorothioate, phosphite, A phosphorus-based compound such as an alkyl hydrogen phosphite, a phosphoric acid acetamide salt or a phosphite amine salt. Further, the blending amount is preferably 〇〇1% by mass or more and 10% by mass or less based on the total amount of the composition, and is preferably 5% by mass or more and 5% by mass. /. The following ranges are selected. As the anti-wear agent, for example, zinc dithiophosphate (ZnDTP), dithiamine bismuth acid (ZnDTC) 'molybdenum molybdenum dithiophosphate (MoDTP), molybdenum oxydithiocarbamate molybdenum (MoDTC) )Wait. Further, the blending amount is based on the total amount of the composition in terms of 〇_1 mass. /. The above range of 5% by mass or less is preferably selected. The antioxidant may, for example, be an alkyl group such as an alkylated diphenylamine, a benzene-α-naphthylamine or an alkylated α-naphthylamine, or a phenol such as a 2,6-di-tributyl-p-cresol or the like. And a sulfur system such as 2,6-di-tertiary butyl_4_[4,6-bis(octylsulfonate) 3 tillage-2-aminoamine] phenol or dilauryl thiodipropionate. In addition, the blending amount is preferably 0. 5% by mass or more and 3% by mass or less, and preferably 0.2% by mass or more and 2% by mass or less, based on the total amount of the composition. The rust inhibitor may, for example, be an alkanolamine such as triethanolamine, a petroleum sulfonate, an alkyl sulfonate, a dinonyl naphthalenesulfonate, an alkenyl succinate or a polyhydric alcohol ester. The blending amount of the rust inhibitors is based on the point of the blending effect, and is preferably 〇.〇! mass based on the total amount of the composition. It is preferable that it is selected from the range of 〇.〇5 mass% or more and 0.5 mass% or less. The metal inactivating agent may, for example, be a triazole-based, a tolyldiazole-based, a thiadiazole-based or an imidazole-based compound. Further, the blending amount is preferably 1% by mass or more and 1% by mass or less based on the total amount of the composition based on the total amount of the composition, preferably 〇.〇1% by mass or more and 〇5% by mass. You can select it under the range of 10 201142012. As the defoaming agent, for example, money burning, fluoroweil alcohol, and fluoxetine can be mentioned. The antifoaming agent is based on the defoaming effect and the economical solution point, and is preferably selected in the range of 5 mass% or more and 〇" mass% or less in terms of the composition h. The lubricating oil composition for metal working of the present invention can impart a high gloss to the rolled sheet at a short rolling distance, and is excellent in resistance, so that it is particularly suitable as a metal material which is as hard as stainless steel and has a high surface roughness. Cold rolling oil is used. [Examples] Next, the present invention will be described in detail by way of examples, but the invention is not limited by the examples. [Examples 1 to 7 and Comparative Examples 1 to 5] (1) Preparation of sample oil: A rolling oil (sample oil) having a blending composition shown in Table 2 was prepared, and the rolling was delayed. Rolling test. Here, each component used for preparation of the sample oil is as follows. (U) Base oil: Two kinds of hydrazine-based mineral oils of 4 〇 <t dynamic viscosity of 7 mm 2 /s and 30 mm 2 /s were used, and the blending ratio of mineral oil was obtained to make 4 〇. The turbulent viscosity becomes 8 mm 2 / s. Aqu is the formula (1) bis. In the case where R1 and r2 are each a methyl group, z is a linear stretched wire having 10 carbon atoms (twelic acid dimethyl laurate). (1.3) 2 § 2: Formula (1) bis (4), r, r2 are all methyl, z is a linear stretch of 12 carbon atoms (fourteen 201142012 (1.4) diester 3: represented by the following chemical formula The second choice of aliphatic dicarboxylic acid. hooc-(ch2)6-c=ch-(ch2)2-ch=c(ch2)6-cooh ch3 ch3 (1_5) diester 4: adipic acid diiso Decyl ester (1.6) Diester 5: Diisodecyl adipate (1.7) Triester: Triester of trimellitic acid and octanol (1.8) Oily agent: Lauryl alcohol, butyl stearate (butyl stearate) Acid ester) [Table 1] Example 1 2 3 4 5 6 7 Blending composition (% by mass) Remaining portion of the remaining portion of the base oil Remaining portion Remaining portion Remaining portion Remaining portion Remaining portion Diester 1 5 10 30 5 - - 5 II Ester 2 - - 10 5 - diester 3 - - - - - - diester 4 - - - - - - diester 5 - - - - - - - - triester - - - - - face - lauryl alcohol - - - - - - 5 butyl stearate - - - 15 - 15 - Evaluation results Thermal scratching reduction rate (%) 35 40 43 39 42 41 38 Rolling distance 30 35 40 35 40 45 30 12 201142012 [ Table 2] Compare your 1 2 3 4 5 base oil remaining remaining remaining remaining part of the part Partial diester 1 - - _ - • Diester 2 - - _ Push-mixed diester 3 10 10 _ _ _ (% by mass) Diester 4 - - r 1〇_ Diacetate 5 - - 10 _ Triester - _ 10 Lauryl alcohol - - _ _ - butyl stearate 5 Lu heat scratches - Evaluation results Reduction rate (%) 43 44 34 36 35 Dry extension distance 80 85 180 > 300 > 300 (2) Rolling Extension experiment (2.1) Evaluation of sinter sinter (constant heat to trace) Under the rolling conditions shown in Table 3, a rolling test was carried out. Specifically, a SUS304 (2B) material having a thickness of 1. Smm was used. Rolling 4 times into 〇67mm, gradually increasing the rolling reduction rate from 14.9% in the 5th pass, and obtaining the reduction rate of hot scratches on the surface of the rolled sheet. (2.2) Evaluation of gloss ▲ The emulsion extension test was carried out under the path scheduling conditions shown in Table 4. Specifically, the plate samples were taken every 5 m after the rolling of the third pass. Next, the gloss of the sample was measured according to the 2G degree gloss (according to ASTM (10)) when the distance exceeds _. The shorter the rolling distance, the faster the roll plating is formed. Further, in this experiment, the rolling process used in the experiment was as follows: the axis 卞 and the horse 1 mm and the surface rough wheel Ra of the secret were 0.03 μιη', which was different from the experiment of (2·1). 13 201142012 [Table 3] Rolling conditions _ Rolling mill - 4-stage reversible rolling mill work roll size T40x200mm Material SUJ-2 Hardness Hs95 Rough Ra 0.05μιη Spare roll size Ψ200χ200ηκη Rolled material SUS304 (2B, 0 material) ) 1.5tx50Wmmx Coil tensile strength 702N/mm2 Oil supply oil temperature 40°C Oil supply 13L/min Single side oil supply only on the inlet side [Table 4] Pass No. Target plate thickness (mm) Depressed Rate (%) Rolling speed (m/min) Tension (kN) Prepare for the side exit side 0 1.000 - - Original plate 1 0.800 20.0 100 9.0 9.0 Constant rolling 2 0.620 22.5 100 7.0 7.0 3 0.500 19.4 100 5.7 5.7 (3) As a result of the evaluation, it can be seen from Table 1 that the sample oils of Examples 1 to 7 are blended in a predetermined second state, so that excellent gloss can be exhibited at a short rolling distance, and the sintering resistance (heat-resistant scratch resistance) can be improved. Said excellent. On the other hand, in the sample oils of Comparative Examples 1 to 4, since the blended diester structure was different from the diester of the present invention, a long rolling distance was required in order to obtain a good gloss. Further, in Comparative Example 5, since the blended ester was a triester, a long rolling distance was also required to obtain a good gloss. [Simplified _ _ ^ ^ Ming] (none) [Main component symbol description] (none) 14