CN114773065A - 一种耐高低温型石墨垫及其制备方法 - Google Patents
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Abstract
本发明涉及石墨垫生产技术领域,尤其涉及一种耐高低温型石墨垫及其制备方法,所制备的耐高低温型石墨垫包括以下质量份的原料:改性膨胀石墨320‑400份、EPDM 16‑20份、SEBS 20‑25份、SC煤沥青20‑30份、无水乙醇16‑20份、二月桂酸二丁基锡15‑19份和水滑石17‑23份,且其制备方法包括以下步骤:S1、将改性膨胀石墨粉碎,并与EPDM、SEBS、二月桂酸二丁基锡和水滑石混合均匀,得混合物;S2、将步骤S1得到的混合物和SC煤沥青进行预混合并制备预底料;S3、将预底料经热压成型为模制品;S4、对模制品进行热压烧结、冷却即可。相比于现有技术,本发明不仅能够提高了该石墨垫的抗氧化性能,而且还能提升石墨垫在高温下的导热性能。
Description
技术领域
本发明涉及石墨垫生产技术领域,尤其涉及一种耐高低温型石墨垫及其制备方法。
背景技术
石墨垫片由纯石墨板或金属增强石墨板切割或冲压而成,具有众多的密封性能,如:热稳定、自润滑、耐腐蚀、不老化、不发脆等,在苛刻的工况条件能长期稳定的使用,极少需要维护。各种各样的圆型的复杂的几何垫片被广泛用于管道、阀门、泵、压力容器、热交换器、冷凝器、发电机、空气压缩机、排气管、制冷机等。
膨胀石墨(EG)作为一种新型功能性碳素材料,除了具备天然石墨本身的耐冷热、耐腐蚀、自润滑等优良性能以外,还具有天然石墨所没有的柔软、压缩回弹性、吸附性、生态环境协调性、生物相容性、耐辐射性等特性。因此,将膨胀石墨作为原料来制备石墨垫可以更好地提升产品的各项性能。
发明内容
本发明的目的是为了解决现有技术中存在的缺点,而提出的一种耐高低温型石墨垫及其制备方法。
为了实现上述目的,本发明采用了如下技术方案:
一种耐高低温型石墨垫,包括以下质量份的原料:改性膨胀石墨320-400份、EPDM16-20份、SEBS 20-25份、SC煤沥青20-30份、无水乙醇16-20份、二月桂酸二丁基锡15-19份和水滑石17-23份。
优选的,所述EPDM与SEBS的质量比为4:5。
优选的,所述改性膨胀石墨与SC煤沥青的质量比为100:7。
优选的,所述改性膨胀石墨的制备方法为:
步骤一:先向150mL水中加入35mL的磷酸并搅拌,然后将焦磷酸盐边加边搅拌地放入配制好的磷酸水溶液中,当出现白色结晶物时停止加入焦磷酸盐,即得浸渍剂溶液;
步骤二:将膨胀石墨放入所述浸渍剂溶液中,煮沸后冷却至常温后,再经干燥后,即得改性膨胀石墨。
优选的,所述浸渍剂溶液煮沸时间为10-15分钟。
优选的,所述焦磷酸盐为焦磷酸钠或焦磷酸钾中的一种。
一种耐高低温型石墨垫的制备方法,包括以下步骤:
S1、将改性膨胀石墨粉碎,并与EPDM、SEBS、二月桂酸二丁基锡和水滑石混合均匀,得混合物;
S2、将步骤S1得到的混合物和SC煤沥青进行预混合,再加入无水乙醇继续混合,混合均匀后烘干,取出后得预底料;
S3、将步骤S2中的预底料在不锈钢热压模具中以100℃-150℃的温度热压成型,得模制品;
S4、对步骤S3得到的模制品进行热压烧结,烧结完毕后,冷却至常温,即得石墨垫。
优选的,所述热压烧结依次包括升温过程、恒温恒压过程和降温过程:
升温过程中,机械压力为20-28MPa,且以20-30℃/min的升温速率升温至800℃-1000℃;
恒温恒压过程中,机械压力线性升高至30-32MPa,温度线性升高至1200℃,之后恒温恒压22-26h,其中,升温速率为10-20℃/min;
降温过程中,保持机械压力为35-40MPa,以120-150℃/h的降温速率降温至室温。
本发明的有益效果是:
1、在本发明中,通过对膨胀石墨进行浸渍改性,使得在石墨垫的外表面上形成保护薄膜,从而有效地提高了该石墨垫的抗氧化性能。
2、在本发明中,通过添加适量的水滑石,可以进一步的提升石墨垫在高温下的导热性能。
具体实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。
实施例1:
一种耐高低温型石墨垫,包括以下质量份的原料:改性膨胀石墨320份、EPDM 16份、SEBS 20份、SC煤沥青22.4份、无水乙醇16份、二月桂酸二丁基锡15份和水滑石17份。
实施例2:
一种耐高低温型石墨垫,包括以下质量份的原料:改性膨胀石墨360份、EPDM 17.6份、SEBS 22份、SC煤沥青25.2份、无水乙醇18份、二月桂酸二丁基锡17份和水滑石20份。
实施例3:
一种耐高低温型石墨垫,包括以下质量份的原料:改性膨胀石墨400份、EPDM 20份、SEBS 25份、SC煤沥青28份、无水乙醇20份、二月桂酸二丁基锡19份和水滑石23份。
在上述实施例1-3中,改性膨胀石墨的制备方法为:
步骤一:先向150mL水中加入35mL的磷酸并搅拌,然后将焦磷酸钠边加边搅拌地放入配制好的磷酸水溶液中,当出现白色结晶物时停止加入焦磷酸钠,即得浸渍剂溶液;
步骤二:将膨胀石墨放入浸渍剂溶液中,然后煮沸浸渍剂溶液,煮沸时间为15分钟,随后,待溶液冷却至常温后,取出膨胀石墨,自然晾干,即得改性膨胀石墨。
水滑石的制备方法为:将75g的滑石粉加入到预热至100℃的高速混合机中搅拌烘干,然后均匀加入32g的钛酸酯偶联剂和15mL的15#白油,搅拌20分钟后,即得水滑石。
上述实施例1-3中制备耐高低温石墨垫的过程如下:
S1、将改性膨胀石墨粉碎,并与EPDM、SEBS、二月桂酸二丁基锡和水滑石混合均匀,得混合物;
S2、将步骤S1得到的混合物和SC煤沥青一起放入球磨机中进行预混合,再加入无水乙醇继续混合,混合均匀后在氮气炉内烘干除去残余的溶剂,取出后得预底料;
S3、将步骤S2中的预底料在不锈钢热压模具中以130℃的温度热压成型,得模制品;
S4、对步骤S3得到的模制品进行热压烧结,烧结完毕后,冷却至常温,即得石墨垫,其中,热压烧结依次包括升温过程、恒温恒压过程和降温过程:
升温过程中,机械压力为25MPa,且以25℃/min的升温速率升温至1000℃;
恒温恒压过程中,机械压力线性升高至30MPa,温度线性升高至1200℃,之后恒温恒压26h,其中,升温速率为20℃/min;
降温过程中,保持机械压力为35MPa,以150℃/h的降温速率降温至室温。
试验一:对石墨垫的抗氧化性能的测定
对比例1:与实施例1相比,原料配方中不同的只有“改性膨胀石墨”用未改性的“膨胀石墨”进行替换,但其用量仍相同;
对比例2:与实施例2相比,原料配方中不同的只有“改性膨胀石墨”用未改性的“膨胀石墨”进行替换,但其用量仍相同;
对比例3:与实施例3相比,原料配方中不同的只有“改性膨胀石墨”用未改性的“膨胀石墨”进行替换,但其用量仍相同;
对比例1-3中制备耐高低温石墨垫的过程与实施例1-3的过程相比,除步骤S1中的“改性膨胀石墨”替换成了未改性的“膨胀石墨”外,其余过程不变。
试验对象:实施例1-3以及对比例1-3中所制得的石墨垫;
试验方法:
在马沸炉中进行,将石墨垫放入预先升温至测试温度(750℃-1200℃)的马沸炉中,关闭炉门氧化1小时,然后取出试验,待冷却后用刷子刷掉石墨垫表面氧化疏松粉末层,称重并计算出氧化失重率并记录;
氧化失重率(单位:%)=(试验前后石墨垫的重量差/试验前石墨垫的重量)×100%;
试验结果:
由上述试验结果可知:
(1)当测试温度≤750℃时,实施例和对比例中的石墨垫均不会发生氧化现象;
(2)当750℃<测试温度≤1100℃时,对比例中的石墨垫表面开始出现氧化现象,且氧化速率逐渐呈增加的趋势,而实施例中石墨垫的表面依旧未出现氧化现象;
(3)当测试温度达到1200℃时,实施例中石墨垫的表面也开始出现氧化现象,而对比例中石墨垫的表面依旧呈增加的趋势;
由此可见,对膨胀石墨进行磷酸盐浸渍处理改性,可以有效地提高该石墨垫的抗氧化性能。
试验二:对石墨垫的导热性能的测定
对比例4:与实施例1相比,原料配方中不同的只有未再添加“水滑石”;
对比例5:与实施例2相比,原料配方中不同的只有未再添加“水滑石”;
对比例6:与实施例3相比,原料配方中不同的只有未再添加“水滑石”;
对比例4-6中制备耐高低温石墨垫的过程与实施例1-3的过程相比,除步骤S1中不再添加“水滑石”,其余过程不变。
试验对象:实施例1-3和对比例4-6中所制得的石墨垫;
试验方法:采用热导率测试仪对上述试验对象进行测试300℃、500℃以及1000℃温度下的导热率;
试验结果:
由上表试验结果可知,实施例和对比例中的石墨垫在高温环境下均有显著的导热效果,但是实施例中石墨垫的效果要更优于对比例中的效果,由此可见,添加水滑石作为配方原料之一,可以有效地提高石墨垫的导热性能。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (8)
1.一种耐高低温型石墨垫,其特征在于,包括以下质量份的原料:改性膨胀石墨320-400份、EPDM 16-20份、SEBS 20-25份、SC煤沥青20-30份、无水乙醇16-20份、二月桂酸二丁基锡15-19份和水滑石17-23份。
2.根据权利要求1所述的一种耐高低温型石墨垫,其特征在于,所述EPDM与SEBS的质量比为4:5。
3.根据权利要求1所述的一种耐高低温型石墨垫,其特征在于,所述改性膨胀石墨与SC煤沥青的质量比为100:7。
4.根据权利要求1所述的一种耐高低温型石墨垫,其特征在于,所述改性膨胀石墨的制备方法如下:
步骤一:先向150mL水中加入35mL的磷酸并搅拌,然后将焦磷酸盐边加边搅拌地放入配制好的磷酸水溶液中,当出现白色结晶物时停止加入焦磷酸盐,即得浸渍剂溶液;
步骤二:将膨胀石墨放入所述浸渍剂溶液中,煮沸后冷却至常温后,再经干燥后,即得改性膨胀石墨。
5.根据权利要求4所述的一种耐高低温型石墨垫,其特征在于,所述浸渍剂溶液煮沸时间为10-15分钟。
6.根据权利要求4所述的一种耐高低温型石墨垫,其特征在于,所述焦磷酸盐为焦磷酸钠或焦磷酸钾中的一种。
7.根据权利要求1-6任一所述的一种耐高低温型石墨垫的制备方法,其特征在于,包括以下步骤:
S1、将改性膨胀石墨粉碎,并与EPDM、SEBS、二月桂酸二丁基锡和水滑石混合均匀,得混合物;
S2、将步骤S1得到的混合物和SC煤沥青进行预混合,再加入无水乙醇继续混合,混合均匀后烘干,取出后得预底料;
S3、将步骤S2中的预底料以100℃-150℃的温度热压成型,得模制品;
S4、对步骤S3得到的模制品进行热压烧结,烧结完毕后,冷却至常温,即得石墨垫。
8.根据权利要求7所述的一种耐高低温型石墨垫的制备方法,其特征在于,所述热压烧结依次包括升温过程、恒温恒压过程和降温过程:
升温过程中,机械压力为20-28MPa,且以20-30℃/min的升温速率升温至800℃-1000℃;
恒温恒压过程中,机械压力线性升高至30-32MPa,温度线性升高至1200℃,之后恒温恒压22-26h,其中,升温速率为10-20℃/min;
降温过程中,保持机械压力为35-40MPa,以120-150℃/h的降温速率降温至室温。
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