CN104870664A - 水系冷却剂 - Google Patents

水系冷却剂 Download PDF

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CN104870664A
CN104870664A CN201380068332.7A CN201380068332A CN104870664A CN 104870664 A CN104870664 A CN 104870664A CN 201380068332 A CN201380068332 A CN 201380068332A CN 104870664 A CN104870664 A CN 104870664A
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water system
quality
system refrigerant
acid salt
salt
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CN104870664B (zh
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长谷川真由
后藤雅久
市谷克实
野口贤郎
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Idemitsu Kosan Co Ltd
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Abstract

水系冷却剂配合有选自碳酸盐、碳酸氢盐、倍半碳酸盐、磷酸盐、硼酸盐、钼酸盐、以及钨酸盐中的1种以上的无机酸盐与金属抗腐蚀剂。本发明的水系冷却剂具有高的冷却性能,且成为冷却对象的金属材料难以产生腐蚀。因此,本发明的水系冷却剂适合作为热处理油或切削油。

Description

水系冷却剂
技术领域
本发明涉及水系冷却剂,详细而言,涉及金属部件的淬火等中使用的水系冷却剂。
背景技术
金属部件的淬火中使用的冷却剂(热处理液)大致分为油系和水系(水溶液),广泛使用油系的热处理液。这是因为:油系的热处理液具有适度的冷却性能,淬火形变小、不用担心发生淬裂。
另一方面,尤其是在大的金属部件、淬火性差的金属部件的情况下,油系热处理液的冷却速度慢、冷却性能不足,因此可以使用水系的热处理液。然而,水系热处理液与油系热处理液相比冷却性能更高,因此容易产生冷却不均、有可能淬裂。
作为提高耐冷却不均性能的技术,一直以来已知有基于食盐水的淬火。食盐水没有蒸汽膜阶段,因此具有高的冷却性能且耐冷却不均性能高、淬裂少(参照非专利文献1)。但是,将食盐水用作热处理液时,在热处理后1小时以内这一极短的时间内生锈,对油槽等设备的腐蚀也显著,因此工业上基本无法使用。
因而,提出了通过含有甲酸或乙酸等有机酸、盐酸或硫酸等无机酸、或者它们的盐的水系热处理液来提高冷却速度(参照专利文献1、2)。
现有技术文献
专利文献
专利文献1:日本特开昭64-42521号公报
专利文献2:日本特开平1-259119号公报
非专利文献
非专利文献1:大和久重雄、“思考淬裂”、热处理、1967年6月、第7卷、第3号、p.140~144。
发明内容
发明要解决的问题
然而,专利文献1、2的水系热处理液中均有可能使成为冷却对象的金属材料产生腐蚀。
本发明的目的在于,提供具有高的冷却性能且成为冷却对象的金属材料难以腐蚀的水系冷却剂。
用于解决问题的手段
为了解决前述课题,本发明提供以下那样的水系冷却剂。
(1)水系冷却剂,其特征在于,其配合有选自碳酸盐、碳酸氢盐、倍半碳酸盐、磷酸盐、硼酸盐、钼酸盐、以及钨酸盐中的1种以上的无机酸盐与金属抗腐蚀剂。
(2)水系冷却剂,其特征在于,在上述水系冷却剂中,前述金属抗腐蚀剂为选自苯并三唑系化合物、苯并咪唑系化合物、苯并噻唑系化合物、以及苯并噻二唑系化合物中的1种以上的化合物。
(3)水系冷却剂,其特征在于,在上述水系冷却剂中,其还配合有杀菌剂。
(4)水系冷却剂,其特征在于,在上述水系冷却剂中,前述杀菌剂的配合量以该冷却剂总量基准计为0.001质量%以上且0.5质量%以下。
(5)水系冷却剂,其特征在于,在上述水系冷却剂中,前述无机酸盐的配合量以该冷却剂总量基准计为1质量%以上且20质量%以下。
(6)水系冷却剂,其特征在于,在上述水系冷却剂中,前述金属抗腐蚀剂的配合量以该冷却剂总量基准计为0.01质量%以上且1质量%以下。
(7)水系冷却剂,其特征在于,在上述水系冷却剂中,前述无机酸盐为无机酸的金属盐。
(8)水系冷却剂,其特征在于,在上述水系冷却剂中,前述无机酸盐为钠盐、钾盐、钙盐、以及镁盐中的至少任一者。
(9)水系冷却剂,其特征在于,在上述水系冷却剂中,前述磷酸盐为正磷酸盐、磷酸氢盐、磷酸二氢盐、多磷酸盐、以及偏磷酸盐中的至少任一者。
(10)水系冷却剂,其特征在于,上述水系冷却剂为淬火油或切削油。
根据本发明,能够提供具有极高冷却性能且成为冷却对象的金属材料难以产生腐蚀的水系冷却剂。
具体实施方式
本发明的水系冷却剂(以下,有时简称为“本冷却剂”。)是配合有特定无机酸盐与金属抗腐蚀剂的水溶液。以下详细说明。
作为本冷却剂中使用的无机酸盐,可列举出碳酸盐、碳酸氢盐、倍半碳酸盐、磷酸盐、硫酸盐、硼酸盐、钼酸盐、以及钨酸盐。它们可单独使用,也可以混合使用。
上述无机酸盐之中,从冷却效果的观点出发,优选为碳酸盐、碳酸氢盐、倍半碳酸盐、以及磷酸盐。另外,碳酸盐与碳酸氢盐从调节pH的观点出发优选混合而使用。
作为磷酸盐,可以为正磷酸盐、磷酸氢盐、磷酸二氢盐、多磷酸盐、以及偏磷酸盐中的任一者。作为多磷酸盐,可列举出二磷酸盐(焦磷酸盐)、三多磷酸盐等。这些之中,从冷却效果的观点出发,优选为焦磷酸盐。这些各磷酸盐可以单独使用,也可以混合使用。另外,它们也可以与前述无机盐混合使用。
作为这样的无机酸盐,优选为金属盐,具体而言,可列举出钠盐、钾盐、钙盐、以及镁盐等。这些之中,从冷却性的观点出发,优选为钠盐、钾盐。
另外,作为本冷却剂中的pH,从防腐败的观点出发,优选为7以上。
本冷却剂中的无机酸盐的优选配合量以该冷却剂总量基准计为1质量%以上且20质量%以下,进一步优选的配合量为3质量%以上且15质量%。无机酸盐的配合量不足1质量%时,冷却效果有可能不充分。另一方面,无机酸盐的配合量即使超过20质量%,也无法期待相应的冷却效果的提高。
本冷却剂中配合有金属抗腐蚀剂。作为金属抗腐蚀剂,适合为苯并三唑系化合物、苯并咪唑系化合物、苯并噻唑系化合物、以及苯并噻二唑系化合物等。它们可单独使用,也可以混合使用。
此处,苯并三唑系化合物是指苯并三唑本身、其衍生物。针对苯并咪唑系化合物、苯并噻唑系化合物、以及苯并噻二唑系化合物也是相同的。
例如,作为苯并三唑系化合物,可列举出苯环上取代有烷基的烷基苯并三唑、以及氨基氢被烷基取代而成的(烷基)氨基烷基苯并三唑等。
作为这样的金属抗腐蚀剂的配合量,以本冷却剂总量基准计优选为0.01质量%以上且1质量%以下、更优选为0.1质量%以上且0.7质量%以下。金属抗腐蚀剂的配合量不足0.01质量%时,金属抗腐蚀效果有可能不充分。另一方面,金属抗腐蚀剂的配合量即使超过1质量%,也无法期待相应的金属抗腐蚀效果的提高。
本冷却剂根据需要还可以配合杀菌剂。作为杀菌剂,可列举出苯并异噻唑啉系化合物、异噻唑啉系化合物、三嗪系化合物、以及吡啶硫酮系化合物等。苯并异噻唑啉系化合物是指苯并异噻唑啉本身、其衍生物。其它化合物也是同样的。
具体而言,作为苯并异噻唑啉系化合物,可列举出苯并异噻唑啉、1,2-苯并异噻唑啉-3-酮、2-甲基异噻唑啉-3-酮、以及5-氯-2-甲基-4-异噻唑啉-3-酮等。作为三嗪系化合物,可列举出六氢-1,3,5-三-(2-羟基乙基)三嗪等。作为吡啶硫酮系化合物,可列举出吡啶硫酮钠等。
作为这种杀菌剂的配合量,以本冷却剂总量基准计优选为0.001质量%以上且0.5质量%以下、更优选为0.01质量%以上且0.4质量%以下。杀菌剂的配合量不足0.001质量%时,杀菌效果有可能不充分。另一方面,杀菌剂的配合量即使超过0.5质量%,也无法期待相应的杀菌效果的提高。
本冷却剂中根据需要还可以配合水溶性防锈剂。水溶性防锈剂的配合量从防锈性能的提高和经济性的平衡等方面出发以本冷却剂总量基准计优选为0.01质量%以上且5质量%以下、更优选为0.03质量%以上且1质量%以下。作为这种水溶性防锈剂,可列举出辛酸盐等脂肪族单羧酸盐、辛烷二酸(辛二酸)盐、癸烷二酸(癸二酸)盐等脂肪族二羧酸盐,可适合地使用例如癸二酸钾等。需要说明的是,作为水溶性防锈剂,也可以为芳香族羧酸盐。另外,作为水溶性防锈剂,也可以适合地使用单羟基单乙基哌嗪等哌嗪衍生物等。
本冷却剂中还可以配合通用的添加剂、例如抗氧化剂和清洗分散剂等。
本发明的水系冷却剂基本没有蒸汽膜阶段,因此具备高的冷却性能。进而,成为冷却对象的金属材料难以产生腐蚀,因此适合作为金属材料的淬火油、切削油。
实施例
接着,通过实施例、比较例来更详细地说明本发明,但本发明不受这些例子的任何限定。
[实施例1~16、比较例1~5]
(试样液的制备)
向离子交换水中配合以下添加剂而制成试样液。需要说明的是,将各试样液的pH也合并记载于表1。参考例仅使用完全未配合添加剂的离子交换水。
无机酸盐等(参照表1):以试样液基准计为10质量%
金属抗腐蚀剂(苯并三唑):以试样液基准计为0.5质量%
杀菌剂:
实施例1~3、9~16、比较例1~5:苯并异噻唑啉(有效成分量为7质量%)以试样液基准计为0.05质量%(试样液中的浓度:0.0035质量%)
实施例4:苯并异噻唑啉以试样液基准计为0.15质量%(试样液中的浓度为0.0108质量%)
实施例5:六氢-1,3,5-三-(2-羟基乙基)三嗪以试样液基准计为0.1质量%(试样液中的浓度为0.080质量%)
实施例6:5-氯-2-甲基-4-异噻唑啉-3-酮以试样液基准计为0.3质量%(试样液中的浓度为0.0060质量%)
实施例7:5-氯-2-甲基-4-异噻唑啉-3-酮以试样液基准计为0.05质量%(试样液中的浓度为0.0010质量%)
实施例8:吡啶硫酮钠以试样液基准计为0.05质量%(试样液中的浓度为0.020质量%)
需要说明的是,实施例15和16是相对于实施例13分别进一步添加1.0质量%、3.0质量%的碳酸氢钠而成的,参考例仅使用完全未配合添加剂的离子交换水。
(冷却试验)
将各试样液保持于50℃,基于JIS K2242B法进行冷却试验,测定特性秒数。具体而言,测定冷却曲线中的达到蒸汽膜阶段结束的温度(特性温度)为止的时间(秒数)。将结果示于表1。
(金属腐蚀试验)
使用金属材料(S45C),以30℃进行3天半的浸渍试验,以如下基准评价腐蚀的程度。将结果示于表1。
A:不存在锈和变色
B:存在锈和变色中的任一者
(腐败试验)
相对于试样液100mL投入细菌5.5mL(大肠杆菌和枯草菌等细菌数:108),以30℃进行一周静置培养,计算细菌数。将结果示于表1。
[评价结果]
由表1的结果可知:本发明的水系冷却液为规定的无机酸盐的水溶液,因此特性秒数均非常短、冷却性能极高。而且,由于配合有金属抗腐蚀剂,难以使金属材料产生腐蚀。因此,可理解为对于金属材料的淬火、切削是极其有效的。
另外,本发明的水系冷却剂的基于杀菌剂的杀菌效果均优异,但比较例的水系冷却剂即使使用相同的杀菌剂,有时也不会发挥出其效果。
通常,水的液体温度达到30℃以上时,冷却性急剧降低、不会淬火。本发明的水系冷却剂即使在50℃的液体温度下也会发挥出优异的冷却性能,是应该特别说明的。
需要说明的是,完全未添加本发明规定的无机酸盐的参考例的离子交换水不会充分表现出冷却性能。另外,即使是无机酸的盐,即使添加与本发明的无机酸盐不同的盐、有机酸的盐,也无法提高冷却性能。
产业利用性
本发明的冷却剂具备高的冷却性能、成为冷却对象的金属材料难以产生腐蚀,因此可用作金属材料的热处理油(淬火油)、切削油。

Claims (10)

1.水系冷却剂,其特征在于,其配合有选自碳酸盐、碳酸氢盐、倍半碳酸盐、磷酸盐、硼酸盐、钼酸盐、以及钨酸盐中的1种的以上无机酸盐与金属抗腐蚀剂。
2.权利要求1所述的水系冷却剂,其特征在于,所述金属抗腐蚀剂为选自苯并三唑系化合物、苯并咪唑系化合物、苯并噻唑系化合物、以及苯并噻二唑系化合物中的1种以上的化合物。
3.权利要求1或权利要求2所述的水系冷却剂,其特征在于,其还配合有杀菌剂。
4.权利要求3所述的水系冷却剂,其特征在于,所述杀菌剂的配合量以该冷却剂总量基准计为0.001质量%以上且0.5质量%以下。
5.权利要求1~权利要求4中任一项所述的水系冷却剂,其特征在于,所述无机酸盐的配合量以该冷却剂总量基准计为1质量%以上且20质量%以下。
6.权利要求1~权利要求5中任一项所述的水系冷却剂,其特征在于,所述金属抗腐蚀剂的配合量以该冷却剂总量基准计为0.01质量%以上且1质量%以下。
7.权利要求1~权利要求6中任一项所述的水系冷却剂,其特征在于,所述无机酸盐为无机酸的金属盐。
8.权利要求7所述的水系冷却剂,其特征在于,所述无机酸盐为钠盐、钾盐、钙盐、以及镁盐中的至少任一者。
9.权利要求1~权利要求8中任一项所述的水系冷却剂,其特征在于,所述磷酸盐为正磷酸盐、磷酸氢盐、磷酸二氢盐、多磷酸盐、以及偏磷酸盐中的至少任一者。
10.权利要求1~权利要求9中任一项所述的水系冷却剂,其特征在于,该水系冷却剂为淬火油或切削油。
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