CN1196079A - 改进的水溶性金属加工液 - Google Patents

改进的水溶性金属加工液 Download PDF

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Publication number
CN1196079A
CN1196079A CN96196974A CN96196974A CN1196079A CN 1196079 A CN1196079 A CN 1196079A CN 96196974 A CN96196974 A CN 96196974A CN 96196974 A CN96196974 A CN 96196974A CN 1196079 A CN1196079 A CN 1196079A
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composition
inhibiter
metal
benzotriazole
weight
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D·J·卡罗塔
D·C·思维尔曼
D·A·马丁
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Monsanto Co
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Monsanto Co
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Abstract

公开了改进的水溶金属加工液,含有聚天冬氨酸及其酰胺和盐,缓蚀剂和碱性添加剂,所述添加剂具有足够的碱性和缓冲能力以维持组合物的pH值在约8.5以上,优选地在约9以上。该组合物在使铁类金属和非铁类金属的切削,弯曲,研磨,和成形的加工中作为润滑剂是有用的,并且由于加入了碱性添加剂该组合物易于维持较高的pH值。聚天冬氨酸及其盐是特别有利的,由于聚天冬氨酸及其盐是很容易生物降解,所以加工液在使用后很容易处置,而无需特殊的处理。

Description

改进的水溶性金属加工液
本发明涉及新型的水溶性金属加工液,这些加工液可生物降解,也不需要回收。具体地,本发明涉及在切削、研磨、成型和其它金属加工操作中可使用的含有聚氨基酸、盐和酰胺的改进配方,这些金属加工操作需要金属加工液。所公开的聚氨基酸化合物具有改进的抗腐蚀性能,而且在环境保护方面要比当前的含油液更受欢迎。
                    发明背景
由于对环境因素的考虑,以前已知的含油金属加工液都需要回收,或者要使用不同于一般排入污水处理系统的方法进行处置。在某些情况下,处置的费用成为主要的费用了,其中处置费用已接近于加工液的初始费用。
金属加工液在各种金属加工应用中具有许多功能。典型的情况下,这种功能包括使工件和工具降温(冷却),减少切屑、工具和工件之间的摩擦(润滑),除去加工产生的金属碎屑,减少或抑制腐蚀作用,以及阻止或减少工件和工具之间在边缘上的累积物。这些功能的组合一般要求加工液中各种成份的配制或组合,以实现特定的金属加工操作所需要的最佳特性。
最近有人已提出以各种加工液来替代含油金属加工液,例如一级酰胺,乙二胺四乙酸,脂肪酸酯,以及链烷醇胺盐。这样的化合物在使用期间能够得以补充,方法是在加工液有效使用期间溶解含有这样化合物的片剂。参见Sato的美国专利4,144,188。
人们也发现胺类在切削油中作为防菌剂是有效的。这类胺包括苯胺基胺和芳烷基胺例如对-苄氨基苯酚。参见Noda等人的EPO 90-400732。
如上所述,工业上所遇到的问题之一就是如何适宜地处置金属加工液的问题。上述的胺可通过生物降解作用从加工液中除去,但需要多种装置例如沉降槽、处理槽和污泥处理槽。日本专利03181395公开了这样的一种装置。为符合环境标准也采用其它的废物处置方法和除油装置。
工人的劳动卫生对于目前采用的含油水溶金属加工液总是个争论焦点。这样的加工液在切削、弯曲、车螺纹和其它的金属加工应用中不可避免地要与使用这些加工液的工人相接触。这样的含油加工液在被处理的工件场所会产生油雾,这样的油雾将穿过机器和操作人员附近的空气。曾试图减少如英国专利2,252,103所关注的油雾问题。该文公开了含有丙烯酰胺,丙烯酸钠和N-n-辛基丙烯酰胺共聚物的聚合增稠器。这种共聚物可与水溶和水不溶的单体进行配方。
由于在应用常用水溶金属加工液的场所的雾化和雾化的漂移,一般特殊的气味是与这样的工作场所分不开的,这种特殊的气味将渗透到整个的地区。一般这样的气味是令人不愉快的,但作为不可避免的工作环境而不得不耐受这样的气味。
因此有一种需求即高度可生物降解的、无气味的、非雾化的水溶金属加工液,特别是在切削操作中有用的加工液。这样的加工液将能免除处置费用的要求,并将给工作场所提供更卫生和更满意的工作气氛。
已经发现了各种不同的方法,这些方法能催化天冬氨酸干混合物的聚合而形成聚琥珀酰亚胺。在干燥环境中进行的优选的催化剂是磷酸。虽然多年来已知磷酸是天冬氨酸热缩合的极好的催化剂,但传统上一直大量地使用它以形成液体或糊状的混合物。然而,也知道可使用相当少量的它以维持基本上是流动粉末。例如,在Knebel等人的美国专利5,142,062中已经公开了,能够应用比值在1∶0.1~1∶2范围内的天冬氨酸与催化剂的重量比。又Fox和Harada在题名为“蛋白质化学分析方法”的发表物中公开了α-氨基酸热缩聚的加工方法,在此发表物中叙述了应用天冬氨酸/催化剂摩尔比为1∶0.07的步骤。另外,Fox和Harada还公开了使用多磷酸作为氨基酸缩聚反应的非常有效催化剂的情况,并指出低于使用O-磷酸时所需的温度是可能的。
在Kalota等人的美国专利5,401,428中,公开了在金属加工中使用聚天冬氨酸、盐和酰胺。虽然从Kalota等人的美国专利4,971,724中知道这样的盐在含水体系中作为铁类金属的缓蚀剂是有效的,但令人惊奇的是,也已发现美国专利5,401,428公开的金属加工液需要含有缓蚀剂。液体长期暴露于空气将导致得到一种可与金属发生腐蚀性反应的加工液,因此需要掺有缓蚀剂。即使有缓蚀剂存在,但是仍然观察到了由于在金属加工的整个正常使用过程所出现的曝气作用而发生的加工液某些降解现象。因此也需要一种Kalota等人金属加工液的配方,它能抵抗因连续暴露于空气而产生的腐蚀作用。
                  发明简要描述
现已发现了包含聚天冬氨酸(polyaspartic acid)、盐和酰胺以及稳定量碱性添加剂的新的金属加工液配方,该聚天冬氨酸、盐和酰胺是高度可生物降解的无味的和不雾化的,所述添加剂具有足够的碱性和缓冲能力,能维持组合物的pH在约8.5以上,优选地在约9以上。发现这样的组合物可抵抗金属加工操作期间由于曝气而产生的降解,并长期的保持不腐蚀性。
当用水稀释时,这种组合物将提供满足各种需要的水基金属加工液,可用于各种铁类和非铁类金属的切削,车螺纹,弯曲,研磨,拉削,攻丝,刨削,齿轮成型,铰削,深孔钻削/钻枪孔,钻孔,镗孔,滚削,铣削,车削,锯削和成形等这样的操作中。在读过本说明书后,本领域工作人员将会认识到这样对于不同的金属加工操作和材料可最佳地选择不同稀释度的金属加工液和各种配方组分的不同浓度比。
                 附图的简要说明
图1是表示二氧化碳对含有少量磷酸钠和苯并三唑的聚天冬氨酸钠水溶液pH的影响的实验中所得的数据的图示表示。
                 发明详细描明
典型情况下,本发明的金属加工液含有有效量的聚天冬氨酸或其盐或其酰胺或在溶液中可提供有效量的上述物质的化合物,优选地以重量计,在水中浓度在约0.5%~约70%的范围内。这个很宽的浓度范围包括金属加工直接使用的组合物(加工液)和作为实际使用的加工液之前适合于稀释的浓缩物而典型地以市售封装的组合物。虽然可以采用其它的比值,但是以约10∶1的比例稀释市售组合物来提供加工液是较为方便的。其它的浓度和稀释比对于本领域工作人员也是显而易见的。
本发明用作浓缩物的优选组合物在水中包含约3%~约25%的聚天冬氨酸,和优选地包含约5%~约20%的其盐或酰胺。虽然可以采用更多或更少的量,但在稀释以形成加工液时该加工液将含有约0.15%~约20%的聚合物。
按照本发明可以使用任何碱性化合物作为添加剂,以产生具有改进稳定性的聚天冬氨酸的组合物。优选的情况下,碱性添加剂在水中至少要微溶。由于赋予稳定性实际上溶液只需要少量的碱性化合物,所以这种碱性化合物在相当小的程度上仅仅可溶就显得有效了。碱性添加剂应该具有足够高的碱性和缓冲能力,以有效的维持聚合物溶液的pH(以一般室温时10%或低于10%的水溶液进行测量)在约8.5~11以上,更优选地约9~10.5。可是,在有效的浓度下,优选地不应导致聚合物溶液的pH大于约11,因为这样会使加工液的使用带来危险,特别是对于机器操作人员来说。
合适的碱性添加剂的实例包括碱金属的碳酸盐,碱金属的正磷酸盐,碱金属的多磷酸盐,碱金属的硅酸盐,碱金属的硼酸盐等等,也包括这些盐的混合物。从价格低廉、碱度适宜、溶解度特性和容易得到的情况来看,碱金属的碳酸盐是优选的。这里所应用的“碱金属”的术语其含义指的是锂,钠,钾,铷和铯,以及它们的混合物。
本发明所应用的碱金属优选地是钾。已经发现,钾盐如本发明所应用的那样,导致金属加工液在水中具有较大的溶解度,更重要的是,会使组合物的冰点降低到低于其它常用的和便宜的碱金属例如钠的冰点。因此,在所有应用的步骤中,应用钾离子来制备本发明的组合物是优选的。也就是说,多琥珀酰亚胺中间物的水解优选地是用氢氧化钾进行的,而不是用通常的氢氧化钠进行的,这种水解本领域是熟知的。碱金属碱性添加剂优选地是钾盐,特别是碳酸钾。但是,至少应用一部分碱金属为钾,余下部分是另外的碱金属例如钠会提供某些好处。例如,当应用常用的氢氧化钠进行多琥珀酰亚胺水解时,碱性添加剂可以是钾盐例如碳酸钾。
为获得好的效果,用于形成稳定的聚天冬氨酸金属加工液的碱性添加剂的量可以广泛地改变,从现有说明来看,即记住上述优选的pH范围,对于任何选定的添加剂利用常规的实验方法可以测定最低的有效浓度。在使用碳酸钠时,优选的范围按重量计在加工液中从约0.02%到更高,在浓缩物中按碳酸钠重量计可高达约7%,而在浓缩物中优选的是按碳酸钠重量计,0.02%~约4%的范围,特别优选的是约1%~约3%的范围。
本发明的碱性添加剂可通过任何典型的和合适的混合或掺合方法与聚天冬氨酸溶液进行混合。在典型地制造聚天冬氨酸金属加工液时,首先通常生产固态物多琥珀酰亚胺。这种物质利用任何典型已知的方法,一般用碱的水溶液进行水解,水解给出了液态物质。在配制步骤期间,碱性添加剂典型地加入液体中。因为仅仅应用了少量的碱性添加剂,所以这种碱性添加剂的掺合可以在加工液制备和封装的最终阶段进行。只要实现合适的混合以获得均匀构成的配方,则不需要特殊的处置方法。
对于碱性添加剂,可以应用直到溶解度极限的任何量的碳酸钠。由于钾盐在这样的水溶液中的溶解度较高,所以在聚酰胺的浓溶液中可以应用稍高于钠盐的量,例如按重量计达9%的量。但是,本发明的以浓缩物的聚天冬氨酸金属加工液典型地是以按重量计在约2%~约70%范围内制备,或可高达聚天冬氨酸、盐或酰胺的溶解度极限制备的。当加到本发明的浓缩物中时,所存在的碳酸钠量按总的混合物的重量计,可以在约0.2%~约7%的范围内。在稀释形式时,为在常见金属加工设备中使用,本发明的浓缩物相对于聚天冬氨酸盐聚合物典型地稀释到约0.7%,和从约0.02%~约碳酸钠的溶解度极限或许是约7%也许还高,和从约0.03%~约10%和优选地约0.08%~约0.8%的碳酸钾。
在本发明的组合物中可以应用其它的不同添加剂以增强或提供一些特性,根据金属加工应用中组合物的使用,这些特性能够扩大功能。添加剂的类型包括界面润滑剂,缓蚀剂,抗氧剂,洗涤剂和分散剂,粘度指数改进剂,乳化调节剂,抗磨损剂和抗摩擦剂以及泡沫抑制剂。
例如,可以应用多种添加剂来增强界面润滑例如耐磨损剂,润滑剂,极限压力剂,摩擦调节剂等等。这样添加剂的典型实例是二硫代磷酸二烷酯金属盐,二硫代磷酸二芳酯金属盐,磷酸烷基酯,碱金属磷酸盐,磷酸三甲苯酯,2-烷基-4-巯基-1,3,4-噻二唑,二硫代碳酸二烷酯金属盐,二硫代磷酸二烷酯金属盐(以上所称金属典型地是锌,钼,钨或其它金属),磷化脂肪和烯烃,硫化或氯化脂肪和烯烃,石蜡,脂肪酸,羧酸和它们的盐,脂肪酸酯,有机钼化合物,二硫化钼,石墨和硼酸盐分散体。这样的界面润滑添加剂本领域是众所周知的。本文有用的其它添加剂包括洗涤剂和分散剂,洗涤剂和分散剂提供净化作用。
虽然本发明的聚天冬氨酸化合物在某个pH的范围内起着缓蚀剂的作用,但是在本发明的组合物中还可以应用这样的一些缓蚀剂,这些缓蚀剂在聚天冬氨酸、其盐和酰胺不起缓蚀剂作用的pH范围内将能起作用。本领域所熟知的和本文有用的缓蚀剂的典型实例(但不限于此)包括铬酸锌,二硫代磷酸盐,例如二硫代磷酸锌,金属磺酸盐其中金属是碱金属,链烷醇胺例如乙醇胺和取代的链烷醇胺,其中烷基的骨架被取代以提供不同的特性,烷基胺例如已胺和三乙醇胺,硼酸盐化合物例如硼酸钠和硼酸盐与胺的混合物,包括高pH值(10和10以上)时聚天冬氨酸的羧酸和硬水中特别有用的烷基氨基羧酸,钼酸钠,硼酸酯例如硼酸单苄酯和带有不同乙醇胺的硼酸(也起着生物静力学的作用),苯甲酸,苯甲酸的硝基衍生物,苯甲酸铵,羟基苯甲酸,苯甲酸钠,带羧甲硫代基羧酸的三乙醇胺盐例如1-1-(羧甲硫代)十一烷酸三乙醇胺盐,苯并三唑,甲苯基三唑和其它的C1-C4烷基苯并三唑。
Aruna Bahadur在发表物中以题名“冷却水体系中缓蚀剂的铬酸盐替代物”中提供了对缓蚀剂较详尽的评述,该文章登载在腐蚀评论,Corrosion Rev.11(1-2),105-122页,1993,本文引用此文章作为参考文献。
具体地,碱金属磷酸盐,正磷酸钾或正硫酸钠是优选的,并有利地包括在本发明的组合物中以补充缓蚀剂。因此本发明的组合物在优选的实施方案中包含了缓蚀剂和含有碱金属正磷酸盐的辅助缓蚀剂。可使用不同量的辅助碱金属正磷酸盐,其用量取决于在约0.1%~约10%重量加工液的范围内金属加工的操作情况。其它的浓度对于通常本领域的技术人员是显而易见的,因为多氨基聚合物在浓缩物以及加工液的实施方案中是进行调节的。
本文所用的“缓蚀剂”术语是指包括那些与本发明的组合物的其它组分一道应用时显示出缓蚀作用的化学品。下表1列出了由重量份数表示,适合于稀释以制备加工液的本发明的典型的浓缩物的组合物。表1的组合物是以重量份数表示的。
本发明的典型浓缩物是含有约3%-30%(重量)的聚天冬氨酸盐或其酰胺,以及约1%-约10%(重量)的缓蚀剂和约200ppm-约5%(重量)碱性添加剂溶液的水溶液。
                                      表I
    成分     钠盐               混合的Na/K盐           钾盐
聚天冬氨酸钠     10     10     10     7.5     0     0
聚天冬氨酸钾     0     0     0     0     11.2     8.37
磷酸二氢钠     2.24     0.97     0     0     0     0
磷酸二氢钾     0     1.56     1.5     4.58     2.75     9.17
碳酸钾     0     1.30     1.3     1.3     1.30     1.3
碳酸钠     1.00     0     0     0     0     0
苯并三唑     0.95     0.95     0     0     0     0
甲苯基三唑酸     0.55     0.55     0.99     1.6     0.99     1.37
    85.26     84.67     86.21     85.02     83.76     79.39
辛酸     0     0     0     0     0     0.4
本发明的组合物也可以含有用以制造聚合物的L-天冬氨酸热缩合反应所使用的少量催化剂。这样的催化剂典型地是一种酸例如磷酸,在琥珀酰亚胺聚合物水解期间,这种酸转化为相应的盐和副产物焦磷酸盐。
本发明的组合物中也可以加入典型的抗氧剂,这些抗氧剂例如包括锌和其它金属的二硫代磷酸盐,受阻酚,金属酚硫化物,无金属酚硫化物,芳香胺以及它们的混合物。
因为使用本发明组合物的许多操作产生了必须要从金属表面移去的颗粒,所以本发明组合物中也使用了洗涤剂和分散剂。典型的分散剂包括多胺琥珀酰亚胺,碱性氧化物,羟基苄基多胺,多羟基琥珀酯,多胺酰胺咪唑啉和它们的混合物。典型的洗涤剂包括金属磺酸盐,高碱性金属磺酸盐,金属酚盐硫化物,高碱性金属酚盐硫化物,金属水杨酸盐,金属硫代膦酸盐和它们的混合物。
因此,本发明的组合物也可以包括表面活性剂,极限压力剂,缓冲剂,增稠剂,灭菌剂,以及在这样的组合物中常用的其它辅助剂和它们的混合物。
市售使用最方便的并适合于使用前进行稀释的本发明的浓缩物组合物将优选地含有不同浓度范围的不同组分的钾盐,但是典型的情况下按重量计含有约0.5%的聚天冬氨酸钾,或高达它的溶解度极限,作为辅助缓蚀剂的约0.1%-约10%的正磷酸二氢钾,约0.02%-约它的溶解度极限即也许约9.5%的碳酸钾,和约200即m-约3%(重量)的缓蚀剂。如上所述,优选的缓蚀剂是甲苯基三唑,这种甲苯基三唑按重量计含有约40%~100%的4-甲基-1H-苯并三唑,约60%-约100%的5-甲基-1H-苯并三唑。本领域的技术人员将认识到,各组分的溶解度极限将受到其它组分的容量的影响。其它有用的缓蚀剂包括烷基苯并三唑,例如C1~C4烷基苯并三唑和丁基苯并三唑。
本发明聚天冬氨酸优选地是由天冬氨酸的热缩合提供的。聚天冬氨酸也可以由其它单体例如马来酸一铵或二铵,富马酸一铵或二铵,和马来酸的聚合而制备。已知许多为此目的制备方法。例如,最近已经发现应用盘式干燥器的连续制备的方法,其中天冬氨酸引入盘的顶层,盘子在水平面内周期性运行,以便将反应物送到转盘的下一个邻近的较低层。利用转盘的层数,转盘的转速,热气体例如空气通过干燥器的循环和温度来控制干燥器的停留时间。这种装置的温度一般在约180℃-约350℃的范围内,停留时间在约0.5-约6小时的范围内。典型的转盘干燥器可从新泽西州Fort Lee的Wyssmont公司购得。
在这样的方法中可以应用的另一种转盘干燥器是从肯特基州的Florence的Krauss Maffei购得的。在Krauss Maffei的转盘干燥器中,热的转盘是静止的,反应物利用轴向转动刮板即刮铲穿过每块塔板的。反应物在转盘的内边缘或外边缘交替地从一个转盘层落到下一个转盘层。反应物利用转盘直接加热。
当可以用于制备聚天冬氨酸的天冬氨酸有几种异构体,例如D-,L-,或DL-天冬氨酸时,在本发明中应用L-天冬氨酸是优选的。
如果反应中使用了催化剂,则干燥器的停留时间可以较短,视上述其它因素而定,停留时间可以在约30分钟-约2小时的范围内。最近已经发现,当循环气体中的二氧化碳存在量至少约为5%(体积)时,则此二氧化碳将能催化热缩合作用。循环气体中存在的二氧化碳量一般约为10%(体积)。
可以采用其它不同的反应器来生产本发明的聚天冬氨酸。典型的反应器包括从瑞士的Aerni,A.G.Augst购得的List反应器和从肯塔基州Florence的Littleford Bros公司购得的Littleford反应器例如FM130型实验室混合器以及较大的生产样机。
Littleford混合器提供了足以产生流化床条件的搅动作用,这种混合器可以装设换流器以破坏已变大的颗粒块,并给流化床提供额外的剪切力。在整个反应期间,混合器提供的搅动作用足以使颗粒维持在基本上是自由流动的状态。典型情况下,Littleford混合器至少是在约180℃的温度条件下运行的,并能够使温度在约180℃-约250℃或更高温度范围内维持加热床到一段足以使天冬氨酸发生聚合的时间。需要装设这种混合器以提供通过反应器的吹扫气流。根据本发明,提供足量的二氧化碳气流,以便催化缩合反应,因此,大大地减少了为达到天冬氨酸完全聚合所需要的时间。
通常的天冬氨酸的热缩合反应将产生聚琥珀酰亚胺的中间物。这种中间物很容易被碱溶液水解而形成聚天冬氨酸盐。碱溶液的实例是碱金属的氢氧化物,三乙醇胺(TEA)等类物,以及氢氧化铵等。
本发明的金属加工组合物中可以使用包括L-天冬氨酸的热缩合所产生的那些聚天冬氨酸的任何水溶盐。典型的水溶盐包括碱金属盐,铵盐,有机铵盐和它们的混合物。术语“碱金属”包括锂,钠,钾,铯,铷和它们的混合物。这里所使用的有机铵盐包括那些由低分子量有机胺,也就是说具有约在270以下分子量的有机胺制备的有机铵盐。这里所应用的有机胺包括烷基胺,亚烷基胺,链烷醇胺。典型的有机胺包括丙胺,异丙胺,乙胺,异丁胺,正戊胺,己胺,辛胺,庚胺,壬胺,癸胺,十一胺,十二胺,十六胺,十七胺,十八胺和碱性氨基酸例如赖氨酸。
不论应用哪种反应器,L-天冬氨酸热缩合产生的聚天冬氨酸或它的盐对本发明都是有用的。已经发现,这种聚合物提供了充分的润滑作用,可以对铁类金属和非铁类金属进行金属加工操作。
本发明可以有效地使用任何分子量的聚天冬氨酸。
由其它来源得到的聚天冬氨酸对于本发明的组合物和方法也是有用的。例如,聚天冬氨酸可以由Fujimoto等人的美国专利3,846,380,Boehmke的美国专利4,839,461,Harada等人的美国专利4,696,981了解的应用马来酸或它的衍生物的缩聚法产生,所有这些专利在这里一并引入本文作为参考文献。如不优选,本发明的加工方法也可以使用氨基酸的共聚物例如根据Havada等人的美国专利4,590,260制备的共聚物。
本发明的水基金属加工液是特别有利的,因为基本上没有与聚天冬氨酸或其盐或胺的水溶液相连系的气味。此外,已经观察到此加工液显著地减少了设备加工区的任何雾化现象,对于水基含油加工液雾化现象是常见的。由于真正不形成油雾,所以加工区实际上不存在偏流的加工液,因而使机械和工人基本上不受本发明的金属加工液的污染。本发明的水基金属加工液是最有利的,因为发现活性成分,即聚天冬氨酸或盐具有很快的降解速度。本发明的金属加工液的生物降解性可以通过通用的方法例如利用排入污水处理系统的方法进行加工液的处置。从关心环境的角度来看由于导致可替换的处置方法,本发明的加工液的投资效益是很明显的。
非铁类金属例如黄铜和铜的试验表明不仅工作场所相对地无污染,而且工件也相对地未沾上沉积物。事实上,已经观察到聚天冬氨酸盐的水溶液如Kalota等人的美国专利4,971,724所表明的那样是缓蚀剂。因此,金属,特别是铁类金属是没有有害的沉积物的,事实上本发明的金属加工液保护了金属防止产生腐蚀。可是,聚天冬氨酸水溶液的缓蚀效应只扩展到pH在8.5和8.5以上范围的溶液。如果本发明的聚天冬氨酸或其衍生物最终得到了pH在10左右或低于10的水溶液,建议将另外的抗腐蚀抑制剂加入到本发明的金属加工液的配方中。但是,图1已经表明,与实际上长期使用加工液时,本发明的聚天冬氨酸组合物的pH由于与酸化剂例如大气中的二氧化碳相接触会有减小的趋势。因此,在本发明的组合物中,包含另外的缓蚀剂,是常见的实际作法。缓蚀剂的量可以广泛地改变,这取决于特定的抑制剂和应用加工液的环境。例如,如果缓蚀剂是铬酸锌,则缓蚀剂的有效量在加工液中仅仅50ppm偏上即可。
本发明的金属加工液在各种不同的金属加工应用例如上述的应用中对任何型号的金属都是有效的。特别是,本发明的金属加工液在加工铁类金属及其合金例如铁,钢(碳钢,低合金碳钢),铸铁,不锈钢,镍基合金,含钴合金等等情况下是有用的。用本发明的加工液可以加工的非铁类金属和合金是铜,黄铜,钛,铝,青铜,镁等等。这样的一些金属利用本发明的水基加工液提供的润滑性能够安全地进行加工。
本发明的金属加工液在切削操作中的特别重要的功能是它的冷却功能,以致可以维持较低的工具温度以及工作温度。这样的控制有助于使工具有磨损和工件的变形减少到最小。本发明的金属加工液的另一个功能是润滑作用,这种润滑作用降低了工具和切削操作期间产生的切屑之间的摩擦,也降低了工具和工件之间的摩擦。在不同类型的切削操作中,典型地产生了金属小片的切屑,这些切屑可以很方便的从工件上尽可能快的除去,因此这些切屑不会轧伤切削工具。
            优选的实施方案的说明
                   实例1
在下面的实例中,应用了具有两个转盘的实验室型转盘干燥器,使反应物从一个转盘到另一个转盘,因此模拟了上面提到的市场可购得的转盘干燥器的条件。反应物从一个转盘到另一个转盘,以使和工业样机所需要的转盘层数相等。从新泽西州Fort Lee的Whyssmont公司得到的模拟Wyssmont透平干燥器的转盘干燥器是在每个转盘层加入1千克L-天冬氨酸和转盘深度2.5厘米条件下进行操作的。采用了总数28个转盘层。整个实验维持在305℃通过干燥器的循环空气温度。空气速度保持在114.3米/分,转盘转动定为3分/转。将一定量的二氧化碳送入空气进料中,以提供按体积计10%的总量,空气中的二氧化碳与转盘上的物料接触。在不同的反应时间从转盘取样,对形成聚合物的转化量,pH,颜色(APHA)和分子量进行分析。下表II列出了所得数据。
                                表II
  样品号    时间(分)    分子量    颜色     pH  形成聚合物的转化率%
    1     30     9402     112     9.17     53.66
    2     64     9333     471     9.82     99.00
    3     70     9263     565     9.26     99.06
    4     90     8792     1069     10.01     99.16
实例2
进行实验以证明二氧化碳对本发明的聚天冬氨酸金属加工液pH的影响。对含残留磷酸钠(以PO4计1500ppm)的1%的聚天冬氨酸钠水溶液用2.5%(体积)二氧化碳的氮气气混合物以及纯氮气进行曝气。图1示出了数据结果,图中曲线A是用纯氮获得的数据,曲线B是用二氧化碳和氮气的混合物获得的数据。如曲线B所示,pH迅速下降表明了二氧化碳对溶液pH的影响。如图1所示,用含二氧化碳的气体进行曝气的溶液迅速地(在几小时之内)表明pH在7左右,而只用氮气充气的溶液的pH基本上仍旧是不变的。
                      实例3
进行加速试验,以验证碱性添加剂对金属加工液pH稳定性的影响,因而也显示了加工液变得对金属有腐蚀性的趋势。用不同的方法制备的多琥珀酰亚胺的样品进行水解,并进行配方供用作金属加工液。由无催化剂的天冬氨酸制备一组样品(样品A),由磷酸以7.5%(重量)存在时的天冬氨酸生产聚天冬氨酸制备另一组样品(样品B)。制备具有下列配方的样品,根据需要,加酸或加碱调节样品到相等的pH:
聚天冬氨酸钠    1%(重量)
苯并三唑        950ppm
磷酸二钠        1500ppm(以PO4计)
pH              9.60
水              693克
用氢氧化钠调节pH到9.6的第三份样品,自来水(样品C)用作对照物。周围的空气,典型地含有0.033%的二氧化碳,在室温和压力下以大于200厘米3/分的恒定速度通过液体样品夹带输送。每天测一次每份溶液的pH值,总共6天。在试验开始时,向每份样品加入数量250ppm-1000ppm的碳酸钠。下表III列出了试验结果。
                               表III
  样品    A    A    A     B     B     B    C
 Na2CO3   250   500   1000    250    500    1000    -
 3.5小时   9.32   9.43   9.43    9.37    9.31    9.34    7.94
 1天   8.89   9.17   9.24    9.00    9.08    9.07    8.05
 2天   8.84   9.01   9.11    8.88    8.87    9.04    7.92
 3天   8.84   8.97   9.08    8.87    8.87    9.04    7.92
 4天   8.80   8.94   9.04    8.80    8.84    9.03    7.84
 5天   8.80   8.92   9.04    8.81    8.85    9.00    8.03
 6天   8.83   8.95   9.05    8.80    8.86    9.03    8.02
从上述的数据可以看出,在维持pH高于自来水的pH值的情况下,碳酸钠在各个水平下均有效。另外,在1000ppm水平下,两天后,pH值达到9或高于9的平衡值。众所周知,在pH9或高于9的条件下,腐蚀的程度已减小到微不足道的程度。在加速试验中,碱性添加剂的加入使pH值稳定在可接受的程度,这表明相当长期的正常使用加工液不会变坏。
                      实例4
在7.5%磷酸催化剂存在时,可利用Wyssmont透平(Turbo)干燥器制备聚天冬氨酸及其钠盐。酸性聚合物用氢氧化钠水解,并稀释到水溶液重量的1%。两批聚天冬氨酸聚合物用苯并三唑进行配方,苯并三唑具有8.3的pKa值。在这个试验中,苯并三唑对pH值不会产生任何影响,因为苯并三唑的pKa值低于试验溶液的pH值。在一批聚合物中,含有200ppm的苯并三唑,未加入碳酸钠,而在另一批聚合物中,含有950ppm的苯并三唑,加入碳酸钠,使其浓度为1000ppm。应用每一批切削加工液作为Okuma LB10切割机的切削加工液。开始,一天后和5天后测量每批切削加工液的pH值。使用每批切削加工液使用三菱DMN G432 MA卡盘切下300件2.54厘米-0.934厘米的1018钢件。切断工具是Manchester M50。下表IV列出了由聚天冬氨酸聚合物切削加工液定期pH测量得到的定期pH试验的结果。表IV
    无碳酸盐     1000ppm碳酸盐开始    9.8          10.31天     8.91         9.915天     8.16         9.78
结果表明,1000ppm的碳酸钠使聚天冬氨酸聚合物切削液的pH值稳定,而未加碱性添加剂的切削加工液的pH值则低于需要的9-9.5pH值。
实例5
典型情况下,可以利用例4所述的L-天冬氨酸进行聚合,然后装入合适的容器中在下表V所示的重量份数的情况下使得到的聚琥珀酰亚胺进行水解以制备本发明的优选的组合物:
                                表V
    装料     数量
    聚琥珀酰亚胺     106
    水     1072
    50%氢氧化钾     133
然后将21份的磷酸二钾,17.7份磷酸钾和13.5份甲苯基三唑加到利用上述的水解步骤产生的聚天冬氨酸钾中。甲苯基三唑是由含40%的4-甲基-1H-苯并三唑和60%的5-甲基-1H-苯并三唑的混合物组成的。在使用甲苯基三唑时,为了获得最好的结果,需要维持甲苯基三唑在加工液中的含量在900ppm以上。
                      实例6
为了证实由于加入钾离子代替钠离子而得到的本发明的组合物的冰点下降,试验上述表I所列的三种组合物,使组合物进行冷却,同时注意目视观察组合物的均匀性和冰点。下表VI列出了实验结果。以重量百分数表示的组合物如下:
                               表VI
    组合物     冰点-℃     沉淀物@℃
    钠盐     -1℃     +10
    钾盐     -6℃     没有沉淀物
    混合盐     -3℃     痕迹量@-0°
从上述数据可明显地看出,钾盐是非常有利的,因为冰点明显地下降了。因为冰点下降的标志在于这一事实,即使在冰点温度仍未观察到沉淀物的析出,这表明未出现溶液分离成不同相的现象。因此,钾盐混合物的冰冻效应没有钠盐或混合盐组合物那样有害,后者为了使组合物由于出现冰点的分离相再分配需要进一步混合才行。
虽然提出相当详细的具体的实施方案对本发明进行了说明,但是应该懂得,这种说明只是通过有效组合物和有效量的组分的实例进行的,本发明不必局限于这种实例说明,因为可替换的实施方案和操作技术对于本领域的技术人员将是显而易见的(鉴于已公开的教导)。因此,进行修正都不偏离本发明的精神和范围。

Claims (50)

1.一种金属加工方法,其中为所述金属提供一种润滑剂,其改进之处包括提供选自天冬氨酸、其盐或其酰胺的聚天冬氨酸聚合物、缓蚀剂和稳定量的碱性添加剂的水溶液,所述碱性添加剂具有足够的碱性和缓冲能力以维持组合物的pH值高于8.5。
2.权利要求1的方法,其中维持pH值高于9。
3.权利要求1的方法,其中聚天冬氨酸聚合物是聚天冬氨酸钾,碱性添加剂是碱金属盐或胺盐或铵盐,和缓蚀剂是甲苯基三唑或苯并三唑或烷基苯并三唑。
4.权利要求3的方法,其中所述碱金属盐是钾盐,缓蚀剂是甲苯基三唑。
5.权利要求3的方法,其中甲苯基三唑或苯并三唑是以至少约100ppm,优选地约900ppm的量存在的。
6.权利要求5的方法,其中甲苯基三唑或苯并三唑是以含有零-约40%的4-甲基-1H-苯并三唑和约60%-约100%5-甲基-1H-苯并三唑的混合物存在的。
7.权利要求1的方法,其中溶液含有约0.05%-约70%,优选地约0.5%-约2%(重量)的所述聚合物,其中缓蚀剂是甲苯基三唑或苯并三唑或烷基苯并三唑,其中碱性添加剂是碳酸钾。
8.权利要求7的方法,其中溶液含有约0.05%-约70%(重量)的所述聚合物,和其中溶液含有碱性添加剂的量为约0.02%-约8%(重量)的范围。
9.权利要求1的方法,其中金属加工是选自车螺纹,研磨,成形,车削,铣削或钻孔等切削操作。
10.权利要求1的方法,其中金属加工是弯曲。
11.权利要求1的方法,其中金属是选自铁,钢(碳钢和低合金钢),铸铁,不锈钢,镍基合金,含钴合金等的铁类金属或合金。
12.权利要求1的方法,其中金属是选自铜,青铜,黄铜,钛,铝,镁等非铁类金属或合金。
13.一种金属加工组合物,它含有选自天冬氨酸、其盐或其酰胺、的聚天冬氨酸聚合物、缓蚀剂和稳定量的碱性添加剂的水溶液,其中所述聚合物的浓度在约0.05%-约70%的范围内,所述碱性添加剂具有足够的碱性和缓冲能力以维持组合物的pH在8.5以上。
14.权利要求13的组合物,其中维持所述pH在9以上。
15.权利要求13的组合物,其中所述缓蚀剂是以约50ppm-约15%(重量)的范围存在的,其中所述的碱性添加剂维持pH值在约8.5-约11的范围内。
16.权利要求15的组合物,其中碱性添加剂是碳酸钾,缓蚀剂是甲苯基三唑。
17.权利要求16的组合物,其中甲苯基三唑是以包含约0-约40%的4-甲基-1H-苯并三唑和约100%-约60%的5-甲基-1H-苯并三唑的混合物存在的。
18.权利要求16的组合物,其中甲苯基三唑是以包含约100%的5-甲基-1H-苯并三唑的混合物形式存在的。
19.权利要求13的组合物,其中聚天冬氨酸聚合物在溶液中的浓度按重量计至少约是0.05%,缓蚀剂是甲苯基三唑,其存在量在约0.01%-约2%重量范围内,以及辅助的缓蚀剂,它包含水溶的碱金属磷酸盐或磷酸铵,其含量在约0.1%-10%(重量)范围内。
20.权利要求19的组合物,其中碱金属磷酸盐选自正磷酸钠或正磷酸钾。
21.权利要求20的组合物,其中聚合物是碱金属盐。
22.权利要求21的组合物,其中所述盐是钾盐。
23.权利要求22的组合物,其中聚合物是酰胺。
24.适于稀释以制备加工液的金属加工浓缩组合物,含有聚天冬氨酸钾、碱性添加剂、缓蚀剂和约1%-约10%(重量)的含有正磷酸钾的辅助缓蚀剂的水溶液,所述碱性添加剂具有足够的碱性和缓冲能力以维持组合物的pH值在约8.5以上。
25.权利要求24的组合物,其中维持pH值在约9以上,碱性添加剂是碳酸钾。
26.权利要求24的金属加工组合物,其中聚天冬氨酸钾的存在量在约0.5%-直到它的溶解度极限的范围内,缓蚀剂是甲苯基三唑,其中所述甲苯基三唑含有约0-约40%(重量)的4-甲基-1H-苯并三唑和约100%-约60%(重量)的5-甲基-1H-苯并三唑。
27.权利要求26的金属加工组合物,其中甲苯基三唑的存在量在约0.1%-约2%(重量)的范围内。
28.权利要求24的金属加工组合物,其中缓蚀剂是苯甲酸盐。
29.权利要求24的金属加工组合物,其中缓蚀剂选自苯甲酸钠和苯甲酸铵。
30.适于稀释的金属加工浓缩组合物,按重量计含有约0.5%至溶解度极限的聚天冬氨酸钾,约0.2%-约9%的碳酸钾,约0.3%-约2%的缓蚀剂和含有约1%-约10%正磷酸钾的辅助缓蚀剂。
31.权利要求30的组合物,其中缓蚀剂是甲苯基三唑。
32.权利要求31的组合物,其中所述甲苯基三唑含有0-约40%(重量)的4-甲基-1H-苯并三唑和约100%-约60%(重量)的5-甲基-1H-苯并三唑。
33.权利要求32的方法,其中溶液含有约0.5%-约70%(重量)的所述聚合物,其中缓蚀剂是烷基苯并三唑或甲苯基三唑或苯并三唑,和其中碱性添加剂是碳酸钠。
34.权利要求33的方法,其中溶液含有约0.5%(重量)或达到溶解度极限的所述聚合物,和其中碳酸钠的在溶液中存在量直到约70%(重量)。
35.权利要求33的方法,其中金属加工是选自车螺纹,研磨,成形,车削,钻孔和铣削的切削加工。
36.权利要求33的方法,其中金属加工是弯曲。
37.权利要求33的方法,其中金属是选自铁,钢(碳钢和低合金钢),铸铁,不锈钢,镍基合金,含钴合金等的铁类金属或合金。
38.权利要求33的方法,其中金属是选自铜,青铜,黄铜,钛,铝和镁的非铁类金属或合金。
39.权利要求33的组合物,其中碱性添加剂是碳酸钠和碳酸钾的混合物,和缓蚀剂是苯并三唑或甲苯基三唑或烷基苯并三唑。
40.权利要求39的组合物,其中缓蚀剂的浓度按重量计在约50ppm-约15%的范围内。
41.权利要求1的组合物,该组合物还含有少量的从获得所述天冬氨酸聚合物的聚合过程中保留的正磷酸钠。
42.权利要求1的组合物,其中聚合物是碱金属盐。
43.权利要求1的组合物,其中聚合物是铵盐或胺盐。
44.权利要求1的组合物,其中聚合物是酰胺。
45.金属加工组合物含有聚天冬氨酸钠、碱性添加剂、少量的正磷酸钠、缓蚀剂和正磷酸钾的水溶液,所述的添加剂具有足够的碱性和缓冲能力以维持组合物的pH约在8.5以上。
46.权利要求45的金属加工组合物,其中聚天冬氨酸钠的存在量在约0.5%至它的浓度度极限的范围内,和缓蚀剂是苯并三唑或烷基苯并三唑或甲苯基三唑。
47.权利要求45的金属加工组合物,其中缓蚀剂添加剂的存在量按重量计在约50ppm-15%的范围内。
48.权利要求1的方法,其中溶液按重量计含有约0.5%-约70%的所述聚合物,和其中缓蚀剂是苯并三唑,和其中碱性添加剂是碳酸钠。
49.权利要求2的方法,其中溶液按重量计含有约5%-约15%的所述聚合物,和其中碳酸钠的存在量按重量计达所述溶液的约7%。
50.权利要求2的方法,其中金属加工是选自车螺纹,研磨和成形的切削加工。
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CN101595156B (zh) * 2006-12-21 2013-01-09 有利凯玛美国有限责任公司 组合物和方法
CN101560430B (zh) * 2009-05-27 2011-12-07 中南大学 一种全合成切削液
CN104870664A (zh) * 2012-12-27 2015-08-26 出光兴产株式会社 水系冷却剂
TWI623613B (zh) * 2012-12-27 2018-05-11 出光興產股份有限公司 水系冷卻劑
US10421924B2 (en) 2012-12-27 2019-09-24 Idemitsu Kosan Co., Ltd. Water-based coolant
CN105238537A (zh) * 2015-10-29 2016-01-13 东莞华程金属科技有限公司 一种水基切削液及其制备方法
CN105238537B (zh) * 2015-10-29 2018-07-31 东莞华程金属科技有限公司 一种水基切削液及其制备方法

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KR19990029090A (ko) 1999-04-15
EP0854905A4 (en) 1999-12-15
PL324550A1 (en) 1998-06-08
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WO1997004052A1 (en) 1997-02-06
NO980239L (no) 1998-03-19

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