CN114135609A - 一种无铜摩擦材料及其制备方法 - Google Patents
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- 239000002783 friction material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 18
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 14
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Abstract
本发明公开了一种无铜摩擦材料。所述无铜摩擦材料,以重量份数计,包括以下成分:酚醛树脂15~25份、硫酸钙晶须10~20份、陶瓷纤维5~20份、橡胶粉3~7份、石墨3~7份、氧化铝15~25份、硫酸钡20~30份。本发明无铜摩擦材料配方的摩擦学性能良好,制动性能稳定;优点在于利用硫酸钙晶须、陶瓷纤维等材料的组合替代铜所实现的功能,避免了重金属铜随摩擦粉尘进入环境中对环境造成污染。
Description
技术领域
本发明涉及一种摩擦材料的新配方,具体的说,它涉及一种无铜环保型汽车用摩擦材料配方以及采用此配方材料制得的刹车片。
背景技术
随着我国汽车保有量的不断增加,由此而造成的污染问题也越来越受到人们的重视。
目前,国内外高性能制动材料多选用金属铜,铜是刹车片设计中的一个关键成分,它不仅对刹车片和刹车盘的磨损、噪声和振动起到了抑制作用,还有助于提高刹车片和刹车盘在各种工作温度下的摩擦稳定性。在欧洲、亚洲和北美使用的刹车片传统无石棉有机材料(NAO)和低钢配方中,铜甚至占到了刹车片总质量的5%至20%。制动材料在加工成制动片后,当车辆刹车时,刹车片和刹车盘接触的位置会由于制动力摩擦而产生部分含铜粉尘,这些粉尘会通过空气、雨水、悬浮颗粒物等进入环境中,从而造成环境污染。
鉴于铜对环境造成的不利影响,美国已开始对刹车片中的铜含量进行逐步限制,并要求在2025年刹车片中铜含量小于0.5%。为此运输车辆制造商现在纷纷指定使用铜含量等级符合规定的制动系统。而用无铜环保型汽车用摩擦材料代替含铜摩擦材料配方将是刹车片行业未来发展的必然趋势。
发明内容
根据上述不足之处,本发明的目的是提供一种无铜环保型汽车用摩擦材料配方。
因此,为了达到上述目的,本发明的技术方案如下:一种无铜摩擦材料,以重量份数计,包括以下成分:酚醛树脂15~25份、硫酸钙晶须10~20份、陶瓷纤维5~20份、橡胶粉3~7份、石墨3~7份、氧化铝15~25份、硫酸钡20~30份。
上述无铜摩擦材料,优选的:以重量份数计,包括以下成分:酚醛树脂20份、硫酸钙晶须15份、陶瓷纤维10份、橡胶粉5份、石墨3份、氧化铝20份、硫酸钡27份。
各成分的作用:
酚醛树脂:树脂基体作为制动材料的粘结剂把增强体和填料粘结成一个整体。酚醛树脂(PR)具有较高的力学强度,良好的耐热性和尺寸稳定性,原材料便宜且易加工等特点,是聚合物基摩擦材料最常用的基体树脂。
其中,腰果壳油改性酚醛树脂可改善刹车片中无机纤维、颗粒的界面结合状况,从而导致试样的热分解、热衰退和热龟裂现象减少,有效地提高了试样的耐磨性能和机械性能。
橡胶粉、石墨:作为润滑剂,添加到摩擦材料中能减小制动时摩擦系数的变化。
氧化铝:作为研磨剂,添加到摩擦材料中能能增加摩擦材料的摩擦系数。
硫酸钡:作为一种无机填料,能够提高摩擦材料的热稳定性,同时也能改善材料的热衰退性能。
硫酸钙晶须、陶瓷纤维:组合使用,作为摩擦材料的增强相,用于代替金属刹车片中的铜粉,起到减轻重量、提供良好热稳定性及抗热衰退性能等作用。
优选地,所述酚醛树脂为腰果壳油改性酚醛树脂,其颗粒大小小于160目。所述橡胶粉为丁腈橡胶粉,颗粒大小为120目。所述石墨颗粒尺寸为250~425微米。所述的陶瓷纤维为硅酸铝陶瓷纤维。
本发明还提供了一种无铜摩擦材料的制备方法,包括如下步骤:
(1)原料的干燥:酚醛树脂在50℃~60℃下干燥一个小时,其他组分在100℃~120℃下干燥一个小时。
(2)混料:将干燥后的原料按照实验设计配方配好后放入BL25C33型带有多组高速转刀的混料机中混合1min~2min,得到均匀的粉状混合物料。
(3)热压成型:称取混至均匀的混合料,投入Y32-63T型四柱液压机中进行热压。
(4)热处理:将热压成型得到的试样放入DHG-9076A型电热恒温鼓风干燥箱内进行160℃保温12小时的热处理。
(5)检验、成品。
本发明技术方案,具有如下优点:利用硫酸钙晶须、陶瓷纤维等材料的组合替代铜在摩擦材料中所实现的功能,制成的刹车片摩擦学性能良好,制动性能稳定。避免了重金属铜随摩擦粉尘进入环境中对环境造成污染。
具体实施方式
下面结合具体实例对本发明作进一步说明。
实施例1
一种无铜摩擦材料,以重量份数计,包括以下成分:腰果壳油改性酚醛树脂20份、硫酸钙晶须15份、陶瓷纤维10份、橡胶粉5份、石墨3份、氧化铝20份、硫酸钡27份。其中腰果壳油改性的酚醛树脂为购买产品。生产厂家为:南通住友电木有限公司。GRADE(品番):PR-50099。LOTNO:604042C。
本发明还提供了一种无铜摩擦材料的制备方法,包括如下步骤:
(1)原料的干燥:酚醛树脂在50℃~60℃下干燥一个小时,其他组分在100℃~120℃下干燥一个小时。
(2)混料:将干燥后的原料按照实验设计配方配好后放入BL25C33型带有多组高速转刀的混料机中混合1min~2min,得到均匀的粉状混合物料。
(3)热压成型:称取混至均匀的混合料,投入Y32-63T型四柱液压机中进行热压。
(4)热处理:将热压成型得到的试样放入DHG-9076A型电热恒温鼓风干燥箱内进行160℃保温12小时的热处理。
(5)检验、成品。
上述制得的汽车刹车片的性能如表1、表2所示。
表1 本发明制得的刹车片定速摩擦试验摩擦系数数据表
表2 本发明制得的刹车片定速摩擦试验磨损率数据表(单位:10-7 cm 3 /N·m)
通过以上实验数据可以看出,本发明的配方摩擦系数良好且十分稳定,在100℃-350℃时均能保持在0.5以上,且在高温状况下摩擦系数没有降低;磨损率在低温与高温条件下也较稳定。
Claims (7)
1.一种无铜摩擦材料,其特征在于:以重量份数计,包括以下成分:酚醛树脂15~25份、硫酸钙晶须10~20份、陶瓷纤维5~20份、橡胶粉3~7份、石墨3~7份、氧化铝15~25份、硫酸钡20~30份。
2.根据权利要求1所述的无铜摩擦材料,其特征在于:以重量份数计,包括以下成分:酚醛树脂20份、硫酸钙晶须15份、陶瓷纤维10份、橡胶粉5份、石墨3份、氧化铝20份、硫酸钡27份。
3.根据权利要求1或2所述的无铜摩擦材料,其特征在于:所述酚醛树脂为腰果壳油改性酚醛树脂,其颗粒大小小于160目。
4.根据权利要求1或2所述的无铜摩擦材料,其特征在于:所述橡胶粉为丁腈橡胶粉,颗粒大小为120目。
5.根据权利要求1或2所述的无铜摩擦材料,其特征在于:所述石墨颗粒尺寸为250~425微米。
6.根据权利要求1或2所述的无铜摩擦材料,其特征在于:所述陶瓷纤维为硅酸铝陶瓷纤维。
7.一种如权利要求1或2所述的无铜摩擦材料的制备方法,其特征在于:包括以下的步骤:
(1)原料的干燥:酚醛树脂在50℃~60℃下干燥1h,其他组分在100℃~120℃下干燥1h;
(2)混料:将干燥后的原料按配比放入混料机中混合1min~2min,得到均匀的粉状混合物料;
(3)热压成型:将粉状混合物料投入液压机中进行热压得到试样;
(4)热处理:将热压成型得到的试样放入干燥箱内进行160℃保温12h的热处理得到无铜摩擦材料。
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