CN109099082A - 一种刹车片涂层 - Google Patents
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- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
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Abstract
本发明涉及车辆的制动技术领域，具体地说是一种刹车片涂层，其特征在于包括涂层配方体系的构成及制备方法，按重量百分比，它是以10‑20%硼酸铝晶须为增强材料，以12‑25%液体树脂作粘结剂，再加40‑60%其它功能性填料而制成的。与没有涂层刹车片性能相比，本发明技术改善了刹车片表面与有沟槽的刹车盘不能完全贴合，相互摩擦会产生制动效力不足、刹车有噪音的缺陷，所制得的涂层耐磨性好、寿命长，粘附力强，摩擦系数有明显提高且制动平稳，因而缩短了初始磨合期，提高了制动效力，而且降低了制动噪音。
Description
]技术领域
本发明涉及车辆的制动技术领域，具体地说是一种刹车片涂层。
背景技术
随着刹车片和刹车盘的不断摩擦，刹车盘表面会出现凹凸不平的磨痕，当更换一套新的刹车片时，齐平的刹车片表面与凹凸不平的刹车盘就不能完全贴合，相互摩擦时就会产生一个制动效力不足现象，容易产生安全隐患。只有经过一段时间的磨合，制动效力才会不断增加，这一时期我们称之为初始磨合期。
为了提高初始磨合期刹车制动效力，我们研究一种涂层技术，也就是在刹车片衬片表面涂一层覆膜，这个涂层覆膜的作用就是提高初始制动力，其原理就是这个涂层上制造了凹凸点，在扫描电镜上可以清楚地观察出涂层的微观结构，这样就缩短了初始磨合期，提高制动效力。
近年来，我国汽车保有量迅速增加，2017全国汽车保有量2.17亿辆，全国每年需求刹车片8亿片左右，据统计全世界刹车片需求量在70亿片以上，因此国内、国际市场需求量巨大。通常，对于刹车片的摩擦对偶刹车盘而言，每一套刹车盘约消耗3套刹车片。而人们对刹车片的性能要求越来越高，特别是对刹车片初始磨合期制动效力的认识也越来越重视，所以刹车片涂层技术应用已经得到国内外市场的广泛认可，具有广阔的市场前景。
发明内容[0003]
本发明的目的在于：提供一种刹车片涂层。本发明针对刹车片在初始磨合期中出现的制动效力不强的现状，开发了一种由硼酸铝晶须为增强材料，液体树脂做粘结剂，氧化铝、氧化锆为摩阻材料，及其它功能性填料而的涂层制备技术，避免了刹车片初始磨合期贴合不好，导致制动效能小、刹车有噪音的诸多不足，提高了刹车片综合性能。
本发明采用的技术措施是：
一种刹车片涂层的配方构成：按重量百分比计算，它是以10-20%硼酸铝晶须为增强材料，以12-25%液体丁腈改性酚醛树脂为粘结剂，再加40-60%功能性填料而制成的。
准确地说，功能性填料中各组份在摩擦材料中所占重量百分比为：12%氧化铝、6%氧化锆、5%二硫化钼、8%人造石墨、5%摩擦粉、24%硫酸钡。
所述硼酸铝晶须属正交晶系结构，与氧化铝晶体结构相似，具有优良的机械强度，耐热耐腐蚀，可作为酚醛树脂很好的补强剂。
所述氧化铝是气相纳米α-Al2O3，气相纳米α-Al2O3能够赋予硼酸铝晶须快速吸附和良好的附着性，增强涂层与刹车片粘附力；且由于其自身带正电荷，涂层具有优异的流动性，便于涂刷和改善摩擦带电性能。
所述涂层制备包括以下步骤：
步骤I混料：称取硼酸铝晶须放入搅拌机中，在1250rpm转速下搅拌3分钟，然后先后加入氧化铝和液体树脂在120rpm转速下搅拌5-6分钟，最后加入功能性填料在120rpm转速下搅拌8-10分钟；
步骤Ⅱ刷涂：将混合好的原料均匀涂在刹车片表面上，涂层厚度≤0.1mm；
步骤Ⅲ固化干燥：将涂层刹车片放入隧道式固化炉中，固化时间45分钟，温度180℃。
与没有涂层刹车片相比，本发明技术改善了刹车片表面与有沟槽的刹车盘不能完全贴合，相互摩擦会产生制动效力不足、刹车有噪音的缺陷，所制得的涂层耐磨性好、寿命长，粘附力强，摩擦系数μ可由0.25提高到0.35以上，且制动平稳，因而缩短了初始磨合期，提高了制动效力，而且降低了制动噪音。
具体实施方式：
实施例1：涂层配方中不同含量的硼酸铝晶须的效能实验对比:
图1涂层中不同含量硼酸铝晶须在不同压力下的摩擦系数变化。从图1中可看出，涂层配方中不同含量的硼酸铝晶须其摩擦系数的波动变化是不同的，其中硼酸铝晶须的含量为15%时，其摩擦系数较高（达到0.35）且曲线平稳，说明制动效能高且稳定。
因此硼酸铝晶须的含量为15%是比较适宜的。
实施例2：涂层配方中不同含量的氧化铝的效能实验对比，参见图2：涂层中不同含量氧化铝在不同压力下的摩擦系数变化；
从图2中可看出，涂层配方中不同含量的氧化铝其摩擦系数的波动变化是不同的，其中氧化铝的含量为12%时，其摩擦系数较高（达到0.35以上）且曲线平稳，说明制动效能高且稳定。
因此氧化铝的含量为12%时，效果最佳。
实施例3：无涂层和有涂层刹车片的效能实验对比，参见图3：有无涂层刹车片在不同制动次数下的摩擦系数变化；
从图3中可看出，有涂层刹车片起始摩擦系数就达到0.3，μ最高达到0.38，比没有涂层的摩擦系数明显高且平稳；没有涂层的刹车片摩擦系数在刹车次数达到50次时，μ才能达到0.3，甚至需要刹车70-80次才能达到；由此可见，涂层大大缩短了刹车片的初始磨合期，提高了制动效力。
实施例4：涂层粘附力测试（划格1*1mm胶带测试），参见图4：使用胶带检测涂层粘附力情况；
从图4中可看出，对刹车片上涂层进行划格（1*1mm），然后贴上3M600胶带，然后慢慢揭下胶带，胶带上无任何涂层粘附物，说明涂层有足够的粘附力。
Claims (3)
1.一种刹车片涂层，其特征在于：该涂层组分包括：按重量百分比，增强材料10-20%、功能性填料40-60%、粘结剂12-25%，三种组分之和为100%；其中增强材料为硼酸铝晶须，功能性填料包括重量比例依次为12：6：5：8：5：24的氧化铝、氧化锆、二硫化钼、人造石墨、摩擦粉、硫酸钡，粘结剂为液体丁腈改性酚醛树脂。
2.根据权利要求1所述一种刹车片涂层，其特征在于所述涂层制备包括以下步骤：
步骤I混料：称取硼酸铝晶须放入搅拌机中，在1250rpm转速下搅拌3分钟，然后分别加入氧化铝和液体树脂在120rpm转速下搅拌5-6分钟，最后加入其它功能性填料在120rpm转速下搅拌8-10分钟；
步骤Ⅱ刷涂：将混合好的原料均匀涂在刹车片表面上，涂层厚度≤0.1mm；
步骤Ⅲ固化干燥：将涂层刹车片放入隧道式固化炉中，固化时间45分钟，温度180℃。
3.根据权利要求1所述的一种刹车片涂层，其特征在于：所述氧化铝是气相纳米α-Al2O3，气相纳米α-Al2O3能够赋予硼酸铝晶须快速吸附和良好的附着性，增强涂层与刹车片表面粘附力；且由于其自身带正电荷，使涂层具有优异的流动性，便于涂刷和改善摩擦带电性能。
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| CN110903731A (zh) * | 2019-10-17 | 2020-03-24 | 山东金麒麟股份有限公司 | 一种刹车片用免烧蚀剂、制备和应用方法及其刹车片 |
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| US5856390A (en) * | 1994-01-31 | 1999-01-05 | Performance Friction Corporation | High temperature coating |
| CN104482087A (zh) * | 2014-12-11 | 2015-04-01 | 烟台孚瑞克森汽车部件有限公司 | 一种刹车片涂层用免烧蚀摩擦涂料及其制备方法 |
| CN104482087B (zh) * | 2014-12-11 | 2017-02-01 | 烟台孚瑞克森汽车部件有限公司 | 一种刹车片涂层用免烧蚀摩擦涂料及其制备方法 |
| CN105402292A (zh) * | 2015-12-16 | 2016-03-16 | 上海理工大学 | 一种汽车刹车片及其制备方法 |
| CN106147124A (zh) * | 2016-06-29 | 2016-11-23 | 芜湖德业摩擦材料有限公司 | 一种重载汽车刹车片用摩擦材料 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110903731A (zh) * | 2019-10-17 | 2020-03-24 | 山东金麒麟股份有限公司 | 一种刹车片用免烧蚀剂、制备和应用方法及其刹车片 |
| CN110903731B (zh) * | 2019-10-17 | 2021-09-28 | 山东金麒麟股份有限公司 | 一种刹车片用免烧蚀剂、制备和应用方法及其刹车片 |
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