CN103897388B - 一种高性能低收缩分离轴承用尼龙套筒材料及制备方法 - Google Patents
一种高性能低收缩分离轴承用尼龙套筒材料及制备方法 Download PDFInfo
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Abstract
本发明专利涉及汽车轴承,具体是指一种高性能低收缩分离轴承用尼龙套筒材料及制备方法。本发明专利在树脂基体中添加一定量的长碳纤维,对长碳纤维进行表面处理,提高其与树脂基体的相容性,防止纤维外露,减少摩擦,提高了轴承的使用寿命,同时可显著提高其热变形温度,提高其耐磨性,同时长碳纤维具有良好的导热性能,通过添加一定量的无机碳导热填料,能有效的提高轴承的刚性以及导热性能,提高其耐磨性能,其具有的化学惰性,能明显的扩大轴承的使用范围;相对的尼龙46所占的百分含量降低,相比同样的一个制件在不降低其他性能的基础上,保持了比较低的吸水率。
Description
技术领域
本发明专利涉及汽车轴承,具体是指一种高性能低收缩分离轴承用尼龙套筒材料及制备方法。
背景技术
轴承是一种保证机械设备运行的关键部件,常见的轴承保持架或其它配件的主要材料主要为金属材料,如高强度黄铜、优质碳素钢等,相对于传统的钢套筒分离轴承,尼龙套筒主要有以下的优点:(1)具有良好的耐化学药品性能;(2)良好的自润滑性能;(3)注射成型工艺的多功能性,可以制备一些特殊结构的器件,如法兰盘等,降低了制造成本;但是目前市场上的分离轴承尼龙套筒普遍存在以下缺点:不耐摩擦,不耐高温导致寿命短等缺点,究其主要原因还是因为塑料本身刚度低、弹性模量低、材料导热性差等原因,因此,开发出一种摩擦系数小、耐高温的低收缩的塑料轴承套筒料势在必行。
尼龙46的分子结构与常见尼龙6,尼龙12,尼龙66等结构相似,但是PA46的每个给定长度的链上的酰胺组数多于其他种类的尼龙,链结构对称度更高,具有非常高的结晶度,结晶速度快,熔点高达295℃,热变形温度也高,长期使用温度高达170℃,在耐热、耐磨、耐油脂、高温下的机械强度等性能方面有非常明显的技术优势(见钱海滨:《Stanyl+PA46在轴承保持架的应用》),但是尼龙46其主链上的酰胺组数多的优点也正是其缺点,具有非常高的吸水率,吸水率高达1.8%,轴承的使用环境也要求了其要具有较低的吸水率,以保持其尺寸的稳定性,在使用的环境下,不可避免的话会接触到水,吸水的同时,之间的尺寸稳定性遭到破坏,会影响之间的使用寿命;本发明专利在树脂基体中添加一定量的长碳纤维,对长碳纤维进行表面处理,提高其与树脂基体的相容性,防止纤维外露,减少摩擦,提高了轴承的使用寿命,同时可显著提高其热变形温度,提高其耐磨性,同时长碳纤维具有良好的导热性能,通过添加一定量的无机碳导热填料,能有效的提高轴承的刚性以及导热性能,提高其耐磨性能,其具有的化学惰性,能明显的扩大轴承的使用范围;相对的尼龙46所占的百分含量降低,相比同样的一个制件在不降低其他性能的基础上,保持了比较低的吸水率。
发明内容
本发明一个目的在于提供一种高性能低收缩分离轴承用尼龙套筒材料,主要目的在于替代传统的钢制轴承套筒材料,提高轴承套筒材料的耐高温性能,耐化学药品性,提高其自润滑性,制备一些特殊结构的器件。
本发明专利提供的一种高性能低收缩分离轴承用尼龙套筒材料,其配方按照重量份数计算主要为:
尼龙46 100份;
聚烯烃 5~10份;
氟塑料 1~2份;
相容剂 1~5份;
长碳纤维 5~10份;
纤维消除剂 0.05~0.1份;
表面活性剂 0.05~0.1份;
润滑分散剂 0.05~0.1份;
抗氧剂 0.03~0.1份;
导热填料 1~5份。
分别按配比称量,将尼龙46、聚烯烃、氟塑料、相容剂、纤维消除剂、表面活性剂以及润滑分散剂、抗氧剂、导热填料,置于高速混合搅拌机中高速混合均匀,时间5~10min,转速500~750r/min;将混合均匀的混料,于挤出机高温熔融,挤出造粒,其中挤出温度:250℃、270℃、270℃、290℃、300℃、310℃、290℃,290℃;其中双螺杆挤出机的主喂比为1:1.5,长径比为45:1。制备得到的粒子,烘干备用;烘干的粒子与长碳纤维(长度在2~5um)进行共混,注塑,其中注塑温度设置在300℃、300℃、310℃。
上述的尼龙46为荷兰DSM公司出产的Stanyl PA46,即高温尼龙,具有极佳的短期和长期耐热性,高温下能保持高强度,高蠕变性能,优异的韧性,极佳的抗疲劳强度和耐磨性以及良好的耐化学性,是轴承的理想材料。
上述的聚烯烃为聚乙烯或聚丙烯,PA46虽然具有非常好的耐油性,但是其分子链具有非常多的酰胺基的官能团,致使其具有非常大的吸水率,为了降低其吸水率,添加一定量的聚烯烃类树脂,降低其吸水率,同时与添加的氟塑料有协同作用,可降低轴承的磨损率,常见的牌号如HDPE 8008,PPT30S,HDPE 6098等。
上述的氟塑料能有效的提高轴承的润滑性,具体为聚四氟乙烯(PTFE),主要原因是因为PTFE分子间的相互引力小,摩擦系数非常小,润滑性优异;此外与上述的聚烯烃具有非常好的协同作用,能有效的降低轴承的磨损率,如日本大金 F-201,M112以及杜邦MP1100等。
上述的相容剂主要为一种含甲基丙烯酸缩水甘油酯(GMA)官能团的烯烃类弹性体,与尼龙46有反应活性;其中主要牌号为st2000,st200。
上述碳纤维,其中为了提高其与尼龙46 的相容性,防止浮纤,需添加0.05-0.1重量份的纤维消除剂、0.05-0.1重量份的表面活性剂和0.05-0.1重量份的润滑分散剂;长碳纤维在使用的过程中,将一定质量的长碳纤维置于经过稀释的钛酸酯偶联剂(5wt%的乙醇-硅烷溶液)溶液中,浸泡10~20h,烘干备用,其中长碳纤维和稀释的偶联剂溶液的质量比为1:2~1:5之间;钛酸酯偶联剂为三羟酰基钛酸异丙酮;硅烷指KH-580,硅烷与乙醇的体积比为1:1-2。
其中所述的纤维消除剂为ACD-F206;
其中所述的表面活性剂为两性离子表面活性剂,如十二烷基氨基丙烯酸、2-十二胺乙基磺酸钠等。
其中所述的润滑分散剂为TAF,TAF是在乙撑双脂肪酸酰胺的基础上引进极性基团,该结构为低分子量BAB型共聚物。
本发明专利中,长碳纤维采用钛酸酯偶联剂进行表面处理,TAF的极性基团与钛酸酯偶联剂的长链末端通过范得华产生很强的吸引力,该吸引力足以使两物相界面消失,而形成一相,TAF溶剂化链段与基体树脂有一定的相溶性,TAF起了相溶剂作用,这样,在长碳纤维、基本树脂之间形成了类似锚固结点,即交联点,改善了长碳纤维与树脂的粘结状态;由于长碳纤维的表面与基体树脂之间的力学作用层厚度增加,使处于长碳纤维表面附近的基体更易于发生剪切屈服,增加对冲击能的吸收和耗散效果,促使长碳纤维对基体树脂之间的增韧效果;由于长碳纤维在树脂中得到很好地包覆,在加工过程中长碳纤维与树脂同步流动,不易扯开,大大地减少外露的长碳纤维;这样,长碳纤维与螺杆的磨擦相应减少,螺杆的扭矩也随之降低,提高螺杆的使用寿命。
上述的抗氧剂主要为了防止尼龙46在加工过程出现氧化降解等现象,添加的助剂,其主要为抗氧剂1010,抗氧剂168等。
上述的导热填料主要为无机碳导热材料,如金刚石、石墨、纤维状高导热碳粉,其特有的化学惰性以及高导热性,能显著的提高轴承的导热系数以及扩大其使用范围。
本发明制备得到的一种高性能低收缩分离轴承用尼龙套筒材料,与目前现有技术相比,具有以下显著优点:
(1)本发明专利制备得到的高性能低收缩分离轴承用弄龙套筒材料,具有良好的耐化学药品性。
(2)本发明专利采用尼龙46作为基体树脂,具有良好的有极佳的短期和长期耐热性,高温下能保持高强度,高蠕变性能,优异的韧性,极佳的抗疲劳强度和耐磨性以及良好的耐化学性,是轴承附件的理想材料。
(3)本发明专利通过添加长碳纤维作为增强体,采用钛酸酯偶联剂处理,同时添加纤维消除剂等有效助剂,能明显的改善长碳纤维与基体树脂之间的粘结力。
(4)本发明专利通过添加无机导热填料,如金刚石粉末,石墨、纤维状高导热碳粉等,能有效的提高轴承的导热系数,增加其耐磨性能,同时由于其具有良好的化学惰性,显著的扩大了轴承的使用范围。
具体实施方式
实施例1
尼龙46 100份;
PTFE M112 6份;
相容剂St2000 1份;
长碳纤维 5份;
ACD-F201 0.05份;
十二烷基氨基丙烯酸 0.05份;
TAF 0.05份;
抗氧剂 1010 0.03份;
金刚石粉末 1份。
实施例2
尼龙46 100份;
聚乙烯(HDPE8008) 6份;
相容剂St2000 1份;
长碳纤维 5份;
ACD-F201 0.05份;
十二烷基氨基丙烯酸 0.05份;
TAF 0.05份;
抗氧剂 1010 0.03份;
金刚石粉末 1份。
实施例3
尼龙46 100份;
聚乙烯(HDPE8008) 5份;
PTFE M112 1份;
相容剂St2000 1份;
长碳纤维 5份;
ACD-F201 0.05份;
十二烷基氨基丙烯酸 0.05份;
TAF 0.05份;
抗氧剂 1010 0.03份;
金刚石粉末 1份。
实施例4
尼龙46 100份;
聚丙烯(T30S) 10份;
PTFE MT1100 2份;
St200 5份;
长碳纤维 10份;
ACD-F201 0.1份;
十二烷基氨基丙烯酸 0.1份;
TAF 0.1份;
抗氧剂 1010 0.1份;
石墨 5份。
实施例5
尼龙46 100份;
聚乙烯(HDPE 6098) 8份;
PTFE MT1100 1.5份;
St200 3份;
长碳纤维 8份;
ACD-F201 0.07份;
十二烷基氨基丙烯酸 0.07份;
TAF 0.07份;
抗氧剂 1010 0.06份;
纤维状高导热碳粉 3份。
将实施例1~5制备得到的尼龙轴承套筒与纯尼龙进行力学性能测试、导热率以及磨损率测试,结果对比如下,可以看出实施例1、2中分别单独添加聚烯烃和氟塑料,其磨损率、缺口冲击强度虽然远优于PA,但相比于同时添加聚烯烃和氟塑料的实施例3、4和5,其磨损率、缺口冲击强度则远远不如:其中摩擦系数表明表面的润滑程度,而磨损率表明表面的损耗程度,用来表征轴承的使用寿命以及使用效率,缺口冲击强度表征轴承的强度,收缩率就是产品的稳定性,导热率越大就是产品在使用过程产生的热量能及时有效的传导出去,保证材料的使用寿命。
。
Claims (3)
1.一种高性能低收缩分离轴承用尼龙套筒材料,其特征在于配方按照重量份数计算为:
尼龙46 100份;
聚乙烯HDPE8008 5份;
PTFE M112 1份;
相容剂St2000 1份;
长碳纤维 5份;
ACD-F206 0.05份;
十二烷基氨基丙烯酸 0.05份;
TAF 0.05份;
抗氧剂1010 0.03份;
金刚石粉末 1份;
或
尼龙46 100份;
聚丙烯T30S 10份;
PTFE MP1100 2份;
St200 5份;
长碳纤维 10份;
ACD-F206 0.1份;
十二烷基氨基丙烯酸 0.1份;
TAF 0.1份;
抗氧剂1010 0.1份;
石墨 5份;
或
尼龙46 100份;
聚乙烯HDPE 6098 8份;
PTFE MP1100 1.5份;
St200 3份;
长碳纤维 8份;
ACD-F206 0.07份;
十二烷基氨基丙烯酸 0.07份;
TAF 0.07份;
抗氧剂1010 0.06份;
纤维状高导热碳粉 3份;
所述的长碳纤维是采用钛酸酯偶联剂进行表面处理过的长碳纤维,长碳纤维长度为2~5um。
2.如权利要求1所述的一种高性能低收缩分离轴承用尼龙套筒材料,其特征在于所述采用钛酸酯偶联剂对长碳纤维进行表面处理的步骤如下:将长碳纤维置于5wt%的钛酸酯偶联剂的乙醇-硅烷溶液中,浸泡10~20h,烘干备用,其中长碳纤维和钛酸酯偶联剂溶液的质量比为1:2~1:5之间;钛酸酯偶联剂为三羟酰基钛酸异丙酯;硅烷指KH-580,硅烷与乙醇的体积比为1:1-2。
3.如权利要求1所述的一种高性能低收缩分离轴承用尼龙套筒材料的制备方法,其特征在于包括如下步骤:分别按配比称量,将尼龙46、聚烯烃、氟塑料、相容剂、纤维消除剂、表面活性剂以及润滑分散剂、抗氧剂、导热填料,置于高速混合搅拌机中高速混合均匀,时间5~10min,转速500~750r/min;将混合均匀的混料,于挤出机高温熔融,挤出造粒,其中挤出温度:250℃、270℃、270℃、290℃、300℃、310℃、290℃,290℃;其中双螺杆挤出机的主喂比为1:1.5,长径比为45:1;制备得到的粒子,烘干备用;烘干的粒子与长碳纤维进行共混,注塑,其中注塑温度设置在300℃、300℃、310℃。
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