CN112145600A - 一种用于汽车刹车片的玄武岩超细纤维表面处理工艺 - Google Patents
一种用于汽车刹车片的玄武岩超细纤维表面处理工艺 Download PDFInfo
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Abstract
本发明公开了一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,包括粉碎、水解、除渣、改性、干燥几个步骤;本发明采用硅烷偶联剂可以促进界面粘附,增强纤维强度,分散性和吸附性,从而增强复合材料的综合性能;使用硅烷偶联剂改性玄武岩纤维可以提高摩擦材料的综合性能;通过硅烷偶联剂进行无机物和有机聚合物之间的截面改性,能够有效提高摩擦材料的性能。
Description
技术领域
本发明涉及无机材料技术领域,具体是一种用于汽车刹车片的玄武岩超细纤维表面处理工艺。
背景技术
20世纪70年代摩擦材料开始向无石棉化发展,出现了各种石棉纤维的替代品,主要有陶瓷纤维、芳纶纤维、碳纤维、钢纤维、铜纤维、铝纤维、玻璃纤维、矿物纤维、纤维素纤维、钛酸钾晶须和海泡石纤维等。与树脂、填料、摩擦性能调节剂相比,增强纤维更受刹车片研究人员的关注,各种增强纤维对汽车刹车片摩擦性能的影响,国内外进行了大量的研究。随着研究的深入,单一纤维增强的摩擦材料性能不全面,存在着各种缺陷,而几种纤维混合在一起,性能可互补,才能起到较好的综合作用。有研究表明,钛酸钾晶须与芳纶纤维黏附在一起,可提高摩擦表面薄膜的耐热性和强度,但是当摩擦材料仅含有两种纤维中的某一种成分时,这种有利的效应大大减小。含有玻璃纤维、铝纤维的刹车片不能提供理想的摩擦系数和磨损率,而利用芳纶纤维代替玻璃纤维,用钛酸钾作为摩擦性能调节剂,可提高刹车片性能;据报道,铜纤维和钢纤维刹车片的摩擦系数都随着滑动速度的增加而减小,铝纤维刹车片的摩擦系数变化不大;加入铜纤维可使摩擦材料拥有高而稳定的摩擦系数和很低的磨损率。另据研究表明,芳纶纤维能够克服树脂的热敏感性,增进摩擦系数稳定性,减小磨损率;塞珞珞纤维能够显著的提高摩擦系数,但是磨损最大;碳纤维增强摩擦材料拥有最好的抗热衰退性能;聚丙烯腈纤维对制动载荷和滑动速度的敏感性最小,对摩擦系数和磨损率的影响也不大。
但这些纤维要么性能单一,要么价格太高,性价比低,不适合用于刹车片的制备。随着科技的进入及研究的深入,玄武岩纤维作为一种新型的环保无机纤维引起制动领域研究者越来越多的关注。
玄武岩属基性火山岩,是地球洋壳和月球月海的最主要组成物质,也是地球陆壳和月球月陆的重要组成物质。玄武岩纤维,是玄武岩石料在1450℃~1500℃熔融后,通过铂铑漏板拉丝法或离心甩丝法制备而成纤维。玄武岩纤维类似于玻璃纤维,其性能介于高强度S玻璃纤维和无碱E玻璃纤维之间,纯天然玄武岩纤维的颜色一般为褐色,有些似金色。玄武岩纤维是一种近年来新出现的新型无机环保绿色高性能纤维材料,它是由二氧化硅、氧化铝、氧化钙、氧化铁和二氧化钛等氧化物组成。玄武岩纤维不仅稳定性好,而且还具有电绝缘性、抗腐蚀、抗燃烧、耐高温等多种优异性能。此外,玄武岩纤维的生产过程基本无废弃物排放,产品废弃后可直接转入生态环境中,无任何危害,因而是一种名副其实的绿色、环保材料。我国已把玄武岩纤维列为国家重点发展的四大纤维(玄武岩纤维、碳纤维、芳纶、超高分子量聚乙烯纤维)之一。玄武岩纤维已在摩擦材料、汽车行业、纤维增强复合材料、造船材料、隔热材料、高温过滤织物以及防护领域等多个方面得到了广泛的应用。
发明内容
本发明的目的就是为了提供一种用于汽车刹车片的玄武岩超细纤维表面处理工艺。
为实现上述目的,本发明是通过以下技术方案来实现的:
本发明的一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,包括以下步骤:
(1)粉碎:将玄武岩纤维粉碎至80-100 目,按重量比为100:2-5与硅烷偶联剂混合均匀,再将混合后的粉末粉碎至200 目备用;
(2)水解:将待处理的金属表面的油污清洗干净,将步骤(1)中得到的混合物与水按照100:20-25混合后,在100-120 ℃下均匀地涂装在金属表面5-6 h;
(3)除渣:将涂装后的金属表面采用除渣器将颗粒大的粉末除去,以确保金属表面均匀平整;
(4)改性:在50-60 ℃的pH=5-5.5的酸性环境中对金属表面进行改进3-5 h,对改性后的金属使用纯水冲洗3-5 min即可;
(5)干燥:将冲洗后的金属置于200-220 ℃的环境中干燥4-6 h,直至金属表面均匀平整即可。
优选地,本发明中所述硅烷偶联剂为Si-69。
与现有技术相比,本发明具有以下优点:
(1)本发明采用硅烷偶联剂可以促进界面粘附,增强纤维强度,分散性和吸附性,从而增强复合材料的综合性能。使用硅烷偶联剂改性玄武岩纤维可以提高摩擦材料的综合性能。
(2)本发明通过硅烷偶联剂进行无机物和有机聚合物之间的截面改性,能够有效提高摩擦材料的性能。
具体实施方式
实施例1
本实施例一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,包括以下步骤:
(1)粉碎:将玄武岩纤维粉碎至80-100 目,按重量比为100:3与硅烷偶联剂混合均匀,再将混合后的粉末粉碎至200 目备用;
(2)水解:将待处理的金属表面的油污清洗干净,将步骤(1)中得到的混合物与水按照100:24混合后,在110 ℃下均匀地涂装在金属表面5.5 h;
(3)除渣:将涂装后的金属表面采用除渣器将颗粒大的粉末除去,以确保金属表面均匀平整;
(4)改性:在55 ℃的pH=5-5.5的酸性环境中对金属表面进行改进4 h,对改性后的金属使用纯水冲洗4 min即可;
(5)干燥:将冲洗后的金属置于210 ℃的环境中干燥5 h,直至金属表面均匀平整即可。
优选地,本实施例中所述硅烷偶联剂为Si-69。
实施例2
本实施例一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,包括以下步骤:
(1)粉碎:将玄武岩纤维粉碎至80-100 目,按重量比为100:2与硅烷偶联剂混合均匀,再将混合后的粉末粉碎至200 目备用;
(2)水解:将待处理的金属表面的油污清洗干净,将步骤(1)中得到的混合物与水按照100:20混合后,在100 ℃下均匀地涂装在金属表面5 h;
(3)除渣:将涂装后的金属表面采用除渣器将颗粒大的粉末除去,以确保金属表面均匀平整;
(4)改性:在50 ℃的pH=5的酸性环境中对金属表面进行改进3 h,对改性后的金属使用纯水冲洗3 min即可;
(5)干燥:将冲洗后的金属置于200 ℃的环境中干燥4 h,直至金属表面均匀平整即可。
优选地,本实施例中所述硅烷偶联剂为Si-69。
实施例3
本实施例一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,包括以下步骤:
(1)粉碎:将玄武岩纤维粉碎至80-100 目,按重量比为100: 5与硅烷偶联剂混合均匀,再将混合后的粉末粉碎至200 目备用;
(2)水解:将待处理的金属表面的油污清洗干净,将步骤(1)中得到的混合物与水按照100: 25混合后,在120 ℃下均匀地涂装在金属表面6 h;
(3)除渣:将涂装后的金属表面采用除渣器将颗粒大的粉末除去,以确保金属表面均匀平整;
(4)改性:在60 ℃的pH=5.5的酸性环境中对金属表面进行改进5 h,对改性后的金属使用纯水冲洗5 min即可;
(5)干燥:将冲洗后的金属置于220 ℃的环境中干燥6 h,直至金属表面均匀平整即可。
优选地,本发明中所述硅烷偶联剂为Si-69。
Claims (2)
1.一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,其特征在于包括以下步骤:
(1)粉碎:将玄武岩纤维粉碎至80-100 目,按重量比为100:2-5与硅烷偶联剂混合均匀,再将混合后的粉末粉碎至200 目备用;
(2)水解:将待处理的金属表面的油污清洗干净,将步骤(1)中得到的混合物与水按照100:20-25混合后,在100-120 ℃下均匀地涂装在金属表面5-6 h;
(3)除渣:将涂装后的金属表面采用除渣器将颗粒大的粉末除去,以确保金属表面均匀平整;
(4)改性:在50-60 ℃的pH=5-5.5的酸性环境中对金属表面进行改进3-5 h,对改性后的金属使用纯水冲洗3-5 min即可;
(5)干燥:将冲洗后的金属置于200-220 ℃的环境中干燥4-6 h,直至金属表面均匀平整即可。
2.根据权利要求1所述的一种用于汽车刹车片的玄武岩超细纤维表面处理工艺,其特征在于:所述硅烷偶联剂为Si-69。
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