CN1010691B - 钢板冷轧油 - Google Patents

钢板冷轧油

Info

Publication number
CN1010691B
CN1010691B CN87102895A CN87102895A CN1010691B CN 1010691 B CN1010691 B CN 1010691B CN 87102895 A CN87102895 A CN 87102895A CN 87102895 A CN87102895 A CN 87102895A CN 1010691 B CN1010691 B CN 1010691B
Authority
CN
China
Prior art keywords
acid
cold
oil
fatty acid
lubricating oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CN87102895A
Other languages
English (en)
Other versions
CN87102895A (zh
Inventor
谷川启一
桧垣勇三
后藤浩之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitsu Shin Sei Yu Ltd
Nippon Steel Corp
Original Assignee
Nitsu Shin Sei Yu Ltd
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitsu Shin Sei Yu Ltd, Nippon Steel Corp filed Critical Nitsu Shin Sei Yu Ltd
Publication of CN87102895A publication Critical patent/CN87102895A/zh
Publication of CN1010691B publication Critical patent/CN1010691B/zh
Expired legal-status Critical Current

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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
    • C10M105/58—Amines, e.g. polyalkylene polyamines, quaternary amines
    • C10M105/60—Amines, e.g. polyalkylene polyamines, quaternary amines having amino groups bound to an acyclic or cycloaliphatic carbon atom
    • C10M105/62—Amines, e.g. polyalkylene polyamines, quaternary amines having amino groups bound to an acyclic or cycloaliphatic carbon atom containing hydroxy groups
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
    • C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
    • C08F299/026—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from the reaction products of polyepoxides and unsaturated monocarboxylic acids, their anhydrides, halogenides or esters with low molecular weight
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Abstract

由合成酯化合物构成的轧制钢板的润滑油可由带叔氮原子的三元或多元醇如异氰尿酸衍生物或亚乙基二胺的氧化乙烯加成产物和脂肪酸制得。它既具有高水平的轧制润滑性又具有高水平的轧机可清洗性。

Description

本发明涉及一种具有高润滑性和高轧机清洗能力的轧制油，也就是一种擅长于润滑和退火特性的钢板冷轧油。
用于薄钢板的冷轧油通常分为两类，一类是以动物油、植物油和脂肪（如动物油脂和猪油、大豆油、菜子油、棕榈油和椰子油）为基础的油，另一类是矿物油。最近，由于节能和提高生产效率的需要，导致高速轧钢、高减速比轧制与清洗轧钢。尽管以动物油、植物油和脂肪为基础的轧钢油适合于高负荷高速度轧制，但是当冷轧钢板直接退火时，没有清除掉钢板表面上的油渍，这意味着在退火阶段它的表面可能被污染。这就是说，这种轧制油从润滑的观点看来是适合的，但从轧机清洗性的观点看来却不适合。
另一方面，当以矿物油为基础的轧钢油进行冷轧时，可获得优异的轧机清洗能力，因此，冷轧薄钢板，能在无任何表面污染的情况下直接退火。但是这种轧钢油缺乏高负荷和高速度轧制性质。
对应用来说，正如在“润滑油化学”No.73-11第695-706页所叙，通常把油性改进剂诸如动物油、植物油、脂肪和脂肪酸（癸酸、月桂酸、肉豆蔻酸、硬脂酸、油酸和亚麻酸）或酯（合成酯，诸如单酯、双酯或醇组分为三甲醇基丙烷、戊赤藓醇和2-乙基己醇的）多元醇酯，加到以矿物油为基础的轧钢油中，以提高其轧制润滑性。但是为了保持轧机的可清洗性这种油性改进剂的加入量只能在所需最低限的窄范围内调节，如上所述，对能同时满足高润滑性质和高轧机可清洗性已进行过很多研究（参见日本专利公开号第56-135600和59-80498），但是尚未发现两种性质均能同时满足、各种性质协调的并处于高水平的任何轧钢油。
本发明为轧钢提供了冷轧油，其贡献在于：可提高以节能意义表示的生产效率，并能减少轧钢工序的步骤，而且这种冷轧油对热和在高速、高压产生的机械剪切是稳定的，甚至对化学反应如氧化、分解和聚合也是稳定的。按照本发明的冷轧油在退 火工序中容易挥发掉而不会产生热分解残渣，而且钢板表面具有可清洗性（轧机可清洗性）和高润滑性。
更具体地说，按照本发明的用于钢板的冷轧油主要由酯化产物组成，这些酯化产物是由选自带叔氮原子氨基醇的三元或更多元醇和带六个或更多碳原子的脂肪酸酯化而成，它具有高润滑性和高的轧机可清洗性，并使之有可能有效地轧制薄钢板，同时又可使退火的钢板无需清除油渍。
本文披露的合成酯是指“分子设计的”，并为这一目的专门合成的。近年来，已采用合成酯类作轧制油的基础油或添加剂。但是用作冷轧油的大多数合成酯都不是为这一目的而专门合成的，而且往往选自用作发动机油、液压传送油或其它润滑剂的现有合成酯类，因此它们均不能满意地符合高润滑性和高的轧机可清洗性。
按照本发明的合成酯具有适于作冷轧油的性质，也就是高润滑性和高的轧机可清洗性相结合，而且正如以下所述它是“分子设计的”。
例如，本发明所用的带叔氮原子的三元或多元醇包括：三乙醇胺，三异丙醇胺，N，N-双（2-羟丙基）乙醇胺，N，N-双（2-羟乙基）-异丙醇胺，三乙醇胺三乙二醇醚，三异丙醇胺三乙二醇醚，三（2-羟乙基）异氰脲酸酯，N，N，N′，N′-四（2-羟乙基）亚乙基二胺，和N，N，N′，N′-四（2-羟丙基）亚乙基二胺。
按照本发明，特别优先选取的带叔氮原子的三元或多元醇是，用以后将给出的以通式（A）表示的异氰尿酸衍生物，或用下面将给出的通式（B）表示的多元醇，其中母体核是由一个亚烷基（或苯基或环己基）二胺形成的，也就是说它是一个四元醇。
本发明中所用的脂肪酸包括：直链或支链的、饱和或不饱和的，和天然或合成的具有六个或更多碳原子的脂肪酸。例如由以下己酸，辛酸，癸酸，月桂酸，肉豆藓酸，棕榈酸、硬脂酸，花生酸，山萮酸，褐煤酸，棕榈油酸，油酸，芥酸，蓖麻油酸，羟基硬脂酸，亚油酸，亚麻酸，异辛酸，异癸酸，异月桂酸，异肉豆蔻酸，异棕榈酸、异硬脂酸和异花生酸为代表的脂肪酸。
曾发现，特定醇同带5个或更少碳原子的脂肪酸的酯化产物，在冷轧钢板时不可能使其润滑性质提高至足够的程度，这是因为本发明对脂肪酸的限制是带有六个或更多的碳原子。另一方面，尽管对所用脂肪酸中的碳原子数的上限没有特殊的限制，但是鉴于在商业上可以买到和价格问题，应优先选用含30或更少碳原子的脂肪酸。
本发明的酯化产物可通过以下反应合成，即带叔氮原子的三元或多元醇与脂肪酸在催化剂存在下或不用催化剂，以任意传统的方式进行酯化。
本发明的一个优选的酯化产物是，用前边所说的通式（A）的异氰尿酸衍生物与含六个或更多碳原子的脂肪酸反应所形成的酯，也就是通式（A）的异氰尿酸衍生物与含六个或更多碳原子的脂肪酸〔用以下通式（C）来表示〕的酯化产物：
式中X是H或CH3，n是1到10的整数，和
R1COOH （C）
式中R1代表一个烷基，链烯基，羟烷基或至少含5个碳原子的羟链烯基基团。
通式为（A）的含氮多元醇（异氰尿酸衍生物）三（2-羟乙基）异氰尿酸酯，式中n＝1，X＝H特别适用于本发明的工业润滑油，因为它很容易买到而且便宜。
对醇同脂肪酸的酯化度没有特殊的限制，但是希望用1摩尔的三（2-羟乙基）异氰尿酸酯同至少1.5摩尔，最好是至少2摩尔的（平均值）脂肪酸酯化。
在通式（A）的含氮多元醇（异氰尿酸衍生物）中，n应选择1到10的整数。但是要注意，数字n的定义是摩尔平均值。在某些情况下，平均值3也可能包括4，这是因为加入的氧化乙烯或氧化丙烯的摩尔数之间存在一个分布状态，也就是n是一个严格地平均值，在本发明中n值的选择应以不大于10为佳，如果超过10，则得到的润滑性质会变坏。
通常，n值增大会给润滑剂本身提供亲水性，也带来了自身乳化能力或分散能力。
按照本发明的另一个优选酯化产物是由前面所说的通式（B）的四元醇与含6个或更多碳原子的脂肪酸所形成的酯，也就是通式（B）的含氮多元醇同含6个或更多碳原子并以通式（C）表示的脂肪酸所形成的酯。 式中X是H或CH3，n是1到10的整数，R2代表含2到6个碳原子的烷基，苯基或一个环己基基团，和
通式（A）的含氮多元醇是通过把预定量的氧化乙烯或氧化丙烯加到亚乙基二胺，亚己基二胺，苯基二胺，环己基二胺等中去而得到的。尤其是N，N，N′，N′-四（2-羟丙基）亚乙基二胺（式中的R2＝C2H4，n＝1及X＝CH3）对于本发明的工业用润滑油为最好，因为它可以从市场上买到而且价格低廉。
醇与脂肪酸的酸化度没有特殊地限制，但是希望用1摩尔的N，N，N′，N′，-四（2-羟丙基）亚乙基二胺与至少2摩尔，最好是至少3摩尔（平均值）的脂肪酸酯化。
据悉，为何多元醇仅限于氧化乙烯或氧化丙烯加成产物的原因是，更高级的氧化烯烃（如氧化丁烯）加成产物在商业上是如此之贵，以致根据经验很难得到。
在通式（B）的含氮多元醇中，n值应选1到10的整数，若多元醇中的n大于10，其分子量增大，它的润滑性将随分子醚键数目的增加而降低。但是应当注意，n值的限定用摩尔平均数值。在某些情况下，平均值为3时也可能包括4，因为加入的氧化乙烯或氧化丙烯的摩尔数可能有一个分布。简言之，n是一个严格的平均值，在本发明中n值应选择不大于10。如果n大于10，所得到的润滑性质将会变坏。
通常，n值增大会给润滑剂本身带来亲水性，也带来了自身的乳化能力或分散能力。
含氮多元醇，它是本发明中合成酯化产物的起始原料，它是四元醇，由它同脂肪酸反应得到的酯化产物呈单脂、双酯、三酯或四酯的形式。但是根据本发明，对于钢板冷轧油来说，通常优选双酯或更高级酯形成的酯化产物更好。
本发明的合成酯可以单独使用，或与其它基础油如矿物油、或动物油、植物油、或脂肪以混合物的形式使用。此外，它还可加入乳化剂以形成乳化液的形式使用。
此外，本发明的合成酯可以和乳化剂结合使用，脂肪酸和抗氧剂以及缓蚀剂通常作为添加剂，而通常以矿物油或动物油、植物油、脂肪或实用的轧制油，作为基础油。
当本发明的合成酯化合物同其它基础油以混合物的形式使用时，其加入量即便少至1%（重量）同样有效，但通常加入量至少为5%（重量），最好至少是20%（重量）就可获得稳定的性质。
本发明的物料不仅适用于作钢板冷轧油，而且可应用于宽范围的工业润滑，如使用切削油或磨削油的加工过程或机械润滑。
实施例
为了单个地加以说明，以下将给出本发明的合成实例和其它实例。
合成实例1
在一个装有搅拌器、温度计、氮进气管和水分离器的四颈烧瓶中，把522克（2摩尔）的三（2-羟乙基）异氰尿酸酯和1269克（5.85摩尔）的椰子油脂肪酸一起加入烧瓶，按起始原料5%的用量加入二甲苯作为回流溶剂。混合物充分搅拌并使之在160～230℃的温度下，无任何催化剂存在的条件下进行反应，直到计算量的水已经蒸出，所需时间为9小时，当反应完成后，在减压下蒸掉二甲苯，随后用活性粘土脱色并过滤，由此得到黄色液体，产量和酸值分别为1661克和1.8。按类似步骤，可制得其它一些合成酯。所得合成酯的性质也列在表1中。
表1
试样    合成酯类型    合成酯的性质
符号    脂肪酸    摩尔比    含氮多元    酸值    羟基值
醇的种类
X    n
A1椰子油脂肪酸 3 H 1 1.8 7
B12-乙基己酸 3 H 1 1.2 4
C1牛油脂肪酸 3 H 1 2.1 15
D1异硬脂酸1）3 H 1 2.3 11
F1硬化的鱼油
脂肪酸2）2.5 H 1 1.5 33
F1妥尔油脂肪酸 3 H 1 1.9 10
G1粗的甲基支化
的混合脂肪酸3）2 H 1 0.7 61
H1牛油脂肪酸 1.5 H 1 0.9 117
I1异硬脂酸 1.5 H 1 1.1 113
J1牛油脂肪酸 1.0 H 0.5 201
K1牛油脂肪酸 3 CH31 1.9 9
L1椰子油脂肪酸 3 H 3 2.5 12
M1异硬脂酸1）2 CH38 3.5 28
1）Emery制造的Emensol    875
2）氢化的精炼鱼油脂肪酸
3）由妥尔油脂肪酸（SV173，IV70）制备二聚酸时，作为副产物形成的含甲基支化的脂肪酸的混合脂肪酸。
实例1-7
进行了轧制油制品的润滑性和退火性质的评价。上述制品是在矿物油和棕榈油等实验轧制油的基础中加入一般用的添加剂和乳化剂、脂肪酸、抗氧剂和本发明的轧制油（合成酯）而得到的。
对每一轧制过的材料的轧制润滑性质进行评价时，是在1.2×20×200毫米的测试条件下，用两段辊筒型轧钢机，于油的浓度为3%、浴温为50℃进行乳液轧制，并于减速比为40%的条件测量轧制负荷。要对每一试样的退火性质进行评价，用几十块经实验乳液轧制的钢板，把它们重叠起来，然后用一条窄钢带把它们固定定位，随后在一小型退火炉中进行退火。
关于退火的加热条件，是在120毫升/分HNX气氛（H2为5%）中以10℃/分的加热速度把重叠钢板加热到600℃，在该温度下保持1小时。随后使之静置冷却。
此后，把玻璃纸带罩在每个钢板的表面上以收集表面沉积物，并把白纸粘贴在上面以有效地观察污染程度，据此评价其表面可清洗性。试验结果列在表2中，表中的符号与表1相同。
表2
乳液5）
对比实例12实例1    2    3    4    5    6    7
合成酯 - - A1C1D1F1G1H1Ic） 1
45    45    45    45    45    45    45
矿物油    55    65    49    50    49    49    49    50    48.5
棕榈油    40    25    7
硬脂酸    2    7    2    2    2.5    2    3    2.5    2
抗氧剂11 1 1 1 1 1 1 1 1
乳化剂22 2 3 2 2.5 3 1 1.5 1.5
润滑性质
轧制负荷31.00 1.03 981.00 97 97 92 95 93
在退火工序
中的表面可
清洗性    △    0～△    ◎～0◎    ◎◎～0    ◎◎～0    ◎～0
轧制油组分的%（W）
1）抗氧剂：2，6-叔丁基苯酚
2）乳化剂：聚氧乙烯烷基苯基醚（HLB为11.7）
3）轧制负荷比：以对比实例1为基础的值
4）表面可清洗性的评价：
◎：未发现污染
0：污染极小
△：发现污染
X：发现污染增多
5）符号A1-I1表明相同酯的符号与表1中一样。浓度是45%，实际所用轧制液体是油含量为3%的乳液。
6）I1表示的酯，其浓度为40%。
合成实例2
在装有搅拌、温度计、氮进气管和水分离器的四颈烧瓶中，加入292克N，N，N′，N′，-四（2-羟丙基）亚乙基二胺、840克椰子油脂肪酸、2.2克甲苯磺酸催化剂和起始原料用量5%的二甲苯回流溶剂。将该混合物充分搅拌并使其在160～230℃反应，直至计算量的水蒸出为止，所需时间为8小时，当反应完成后，用水洗涤反应产物以脱除催化剂，并在减压下蒸去二甲苯，随后用活性粘土脱色并过滤，由此得到黄色液体。产量和酸值分别为970克和2.3（A试样）。按类似步骤制备其它一些合成酯，所得合成酯的性质也列在表3中。
实例8-13
对轧制油制品的润滑性和退火性质进行评价。上述制品是把添加剂如乳化剂、脂肪酸和抗氧剂及本发明的轧制油合成酯加到矿物油和棕榈油等用作实验的轧制油基础油中制得的。
在1.2×20×200毫米测试条件下，每一轧制材料的轧制润滑性质的评价是，用两段辊筒型轧钢机，油的浓度为3%，浴温50℃，在减速比为40%的条件下测量轧制负荷，以上述条件进行乳液轧制。每个试样的退火性质评价是把几十块用乳液轧制过的钢板重叠起来，然后用一条窄钢带把它们固定定位，随后在小型退火炉中退火。（见表3）
关于退火的加热条件是：在120毫升/分的HNX气氛（H2为5%）中以10℃/分的加热速度，把重叠的钢板加热到600℃，在该温度下保持1小时，随后使之静置冷却。
此后，用一个玻璃纸带罩在每块钢板的表面上以收集表面沉积物，并粘贴在白纸以有效地观察污染程度，并据此评价其表面可清洗性。试验结果列在表4中，表中的符号与表3中所列者相同。
在本发明中，合成酯化合物是由带叔氮原子的三元或更高级多元醇如异氰尿酸衍生物、或亚乙基二胺的氧化乙烯或氧化丙烯加成产物（用来作钢板的轧制润滑剂），并把最终要求考虑在内而进行“分子设计的”。和用作冷轧油或添加剂的现有合成酯不同，按照本发明的酯化合物能使钢板的轧制润滑性大大改进，它与棕榈油这一普通基础油相比，对节约能量和材料做出巨大贡献，例如可降低电力费用。此外，本发明的酯化合物擅长于轧机可清洗性，并可省去通常的电解清除油渍，结果降低了设备费用。
表4
乳化液5）
对比实例3    实例8    9    10    11    12    13
合成酯 - A2B2D2E2F2G2
45    45    45    45    45    45
矿物油    55    50    50    50.5    50    50.5    46
棕榈油    40    -    -    -    -    -    5
棕榈酸    2    2    2    2    2    1.5    1.5
抗氧剂11 1 1 1 1 1 1
乳化剂22 2 2 2 1.5 2 1.5
轧制负荷比3）1.00 94 92 96 95 93 93
（润滑性质）
在退火工序中
的表面可
清洗性    △～X    ◎～0◎    ◎～0◎    ◎～0    ◎～0
1）抗氧剂：2，6-叔丁基-4-甲基苯酚
2）乳化剂：聚氧乙烯壬基苯基醚（HLB为11.7）
3）轧制负荷比：以对比实例1为基准的值
4）表面可清洗性的评价：
◎：未发现污染
0：发现污染极小
△：有污染
X：污染增多
5）实际所用的轧制液体是油含量为3%的乳化液，符号A2-G2是与表3中符号相同的同一酯组分。
表3
试样    多元醇类型    脂肪酸    酯的通性
符号 X n R2类型 摩尔数 酸值 羟基值
A2CH31 （CH2）2椰子油脂肪 4 2.3 8
酸
B2CH31 （CH2）2异硬脂酸 2 0.5 121
C2CH33 （CH2）2牛油脂肪酸 3 0.7 37
D2CH33 （CH2）2硬化的鱼油
脂肪酸2）2.5 0.6 54
E2H 1 （CH2）2异辛酸 4 1.1 6
F2H 1 （CH2）2妥尔油脂肪
酸    3    0.5    51
G2H 2 （CH2）2异硬脂酸1）3.5 0.5 15
H2H 1 （CH2）2牛油脂肪酸 1.5 0.4 201
I2CH31 （CH2）6羊毛脂脂肪
酸    3    2.5    33
J2H 1 椰子油脂肪
酸    3.5    1.1    18
K2CH310 （CH2）2异硬脂酸 3.5 1.8 9
1）Emery制造的Emersol    871
2）氢化的精炼鱼油脂肪酸

Claims (9)

1、一种含有至少5%(重)由(1)选自带叔氮的氨基醇的三元或多元醇和(2)含六个或更多个碳原子的脂肪酸生成的酯化产物的钢板冷轧油，其特征在于具有叔氮的三元或多元氨基醇为下列通式(A)所示的异氰脲酸衍生物：
式中X是H或CH3，n和1到10的整数，
和/或下列通式(B)所示的四元醇：
式中X与n如(A)所定义，R为C2-6烷基、苯基或环已基。
2、按照权利要求1中所述的冷轧油，其中以通式（A）表示的异氰尿酸衍生物是三（2-羟乙基）异氰尿酸酯，或三（2-羟丙基）异氰尿酸酯。
3、按照权利要求1中所述的冷轧油，其中酯化产物是由1摩尔三（2-羟乙基）异氰尿酸酯和至少1.5摩尔（平均值）的脂肪酸酯化而得到的。
4、按照权利要求3中所述的冷轧油，其中脂肪酸至少是以2摩尔（平均值）的比例被酯化。
5、按照权利要求3中所述的冷轧油，其中脂肪酸至少选自：椰子油脂肪酸，2-乙基己酸，牛油脂肪酸，异硬脂酸，硬化鱼油脂肪酸，妥尔油脂肪酸和甲基-支化混合脂肪酸粗品中的一种。
6、按照权利要求1所述的冷轧油，其中带叔氮原子的三元或多元胺基醇至少选自：N，N，N′，N′-四（2-羟乙基）亚乙基二胺和N，N，N′，N′，-四（2羟丙基）亚乙基二胺中的一种。
7、按照权利要求1中所述的冷轧油，其中酯化产物是由1摩尔N，N，N′，N′-四（2-羟丙基）亚乙基二胺同至少2摩尔（平均值）比例的脂肪酸酯化而制得的。
8、按照权利要求7中所述的冷轧油，其中脂肪酸至少是以3摩尔（平均值）的比例被酯化。
9、按照权利要求8中所述的冷轧油，其中的脂肪酸至少选自：椰子油脂肪酸，异硬脂酸，牛油脂肪酸，硬化鱼油脂肪酸，异辛酸妥尔油脂肪酸和羊毛脂脂肪酸中的一种。
CN87102895A 1986-04-21 1987-04-20 钢板冷轧油 Expired CN1010691B (zh)

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US4889648A (en) 1989-12-26
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EP0242925A3 (en) 1988-08-17
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