CN106009320B - 一种epdm高分子发泡车灯密封圈材料及其制备方法 - Google Patents
一种epdm高分子发泡车灯密封圈材料及其制备方法 Download PDFInfo
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Abstract
本发明涉及发泡材料,具体涉及一种EPDM高分子发泡车灯密封圈材料及其制备方法。本发明的方案是,一种EPDM高分子发泡车灯密封圈材料,由以下质量百分比的原料制得:三元乙丙橡胶30~60%、活性剂1~5%、补强剂20~50%、软化剂14~47%、硫化剂1~5%、发泡剂1~5%。本发明克服了现有汽车车灯密封圈材料表面有气孔的问题,密封性能大大提高,从而满足工业发展的新需要。同时本发明的制备方法也简单易行,适合工业生产。
Description
技术领域
本发明涉及发泡材料,具体涉及一种EPDM高分子发泡车灯密封圈材料及其制备方法。
背景技术
在经济高速发展的今天,汽车不再是一种奢侈品,已经成为一种大众消费品走进千家万户,人们在追求高品质生活的同时也必然对汽车的高质量有了更高的要求。车灯是汽车敏感部件之一,由于在工作时产生热量并且连接有电线,所以需要避免与水或杂物接触,以免发生意外或影响车灯使用效果,因此车灯需要加上灯罩,并且对灯罩的密封要求很高,由于车灯密封不严,在清洗和下雨的时候很容易造成进水,而当内外温差较大的时候就会形成雾气,另外,如果密封材料不行,高温烘烤也会造成二者之间的密封材料熔化,增大车灯进水的可能性,如果外部的水进入车灯内会造成车灯积水或起雾,严重威胁车灯灯泡的使用寿命和车灯电路的安全。车灯发泡密封圈可防止这一现象。目前发泡密封圈的材料一般只有硅胶发泡和三元乙丙橡胶(EPDM)发泡两种。硅胶受热时会产生低分子硅氧烷,会腐蚀破坏车灯内的电路,只能用于特殊机构的车灯内。EPDM发泡密封圈因为本身是发泡材料,制备过程中常常会有气孔,存在很大的不稳定因素,造成车灯密封性不好,引起车灯进水。因此,如何研发出新型发泡车灯密封圈材料满足更高要求是本行业亟需解决的问题。
发明内容
本发明要解决的技术问题是提供一种新型的EPDM高分子发泡车灯密封圈材料及其制备方法,克服了现有汽车车灯密封圈材料表面有气孔的问题,密封性能大大提高,从而满足工业发展的新需要。同时本发明的制备方法也简单易行,适合工业生产。
本发明的方案是,一种EPDM高分子发泡车灯密封圈材料,由以下质量百分比的原料制得:
三元乙丙橡胶 30~60%
活性剂 1~5%
补强剂 20~50%
软化剂 14~47%
硫化剂 1~5%
发泡剂 1~5%。
另一优选方案是,由以下质量百分比的原料制得:
三元乙丙橡胶 40~45%
活性剂 2~3%
补强剂 22~40%
软化剂 16~36%
硫化剂 2~3%
发泡剂 2~3%。
另一优选方案是,所述三元乙丙橡胶中乙烯的含量为40~70%。
另一优选方案是,所述活性剂为氧化锌、硬脂酸、硬脂酸锌中的一种或几种的混合物。
另一优选方案是,所述补强剂为快压出炭黑、半补强炭黑、活性碳酸钙中的一种或几种的混合物。
另一优选方案是,所述硫化剂为过氧化二异丙苯、三烯丙基异三聚氰酸酯(T中的一种或两种的混合物。
另一优选方案是,所述发泡剂是二本磺酰肼醚、偶氮二甲酰胺、尿素中的一种或几种的混合物。
本发明还提供所述EPDM高分子发泡车灯密封圈材料的制备方法,该制备方法包括以下步骤:
(1)在密炼机中加入三元乙丙橡胶密炼2~4分钟;
(2)将活性剂、补强剂、软化剂分2~4次投料,每次密炼4~8分钟,投料完后升温至130~138℃排料;
(3)在开炼机上出片停放8~24小时后,再加入硫化剂、发泡剂,混炼均匀后出片停放4~36小时即得EPDM高分子发泡车灯密封圈材料。
所述EPDM高分子发泡车灯密封圈材料的制备方法,另一优选方案是,包括以下步骤:
(1)在密炼机中加入三元乙丙橡胶密炼3分钟(密炼时间过短,橡胶未能充分软化,影响炼胶效果;密炼时间过长,橡胶分子链破坏过多,影响复合材料物理性能);
(2)将活性剂、补强剂、软化剂分3次投料(一次投料或分2次投料活性剂、补强填充剂、软化剂在EPDM橡胶中分散不均,3次即可达到理想分散效果,4次以上影响炼胶工作效率),每次密炼4~8分钟,投料完后升温至132~136℃排料;
(3)在开炼机上出片停放10~20小时后,再加入硫化剂、发泡剂,混炼均匀后出片停放10~24小时即得EPDM高分子发泡车灯密封圈材料。
本发明还提供一种汽车车灯密封圈的制备方法,其包括如下步骤:
(1)制备EPDM高分子发泡车灯密封圈材料;
(2)将EPDM高分子不发泡混炼胶料剪成1~2克的小块,用二甲苯做溶剂,按胶料:溶剂=1:4的比例配成胶浆,用搅拌机搅拌1小时,停放4~36小时;
(3)将冲切好的EPDM发泡材料浸泡入胶浆内2~5秒,取出悬挂晾干,重复5次,放入密封圈模具内,190℃下10分钟后再冷却至40℃以下,即得EPDM高分子发泡车灯密封圈。
本发明的高分子发泡汽车车灯密封圈材料压缩量比现有的不发泡材料要大18%左右,密封性更好,同时重量也比不发泡的EPDM轻20%左右,并且表面没有气泡,大大增加了密封性。
具体实施方式
以下提供本发明的一些具体实施例,以助于进一步理解本发明,但本发明的保护范围并不仅限于这些实施例。
实施例1:
按重量百分比在密炼机中加入41.5%EPDM橡胶,密炼3分钟,将2.5%活性剂、22.8%补强剂、30%软化剂分三次投入密炼机,每次密炼5分钟,最后升温至135℃排料,在开炼机上出片停放8~24小时后在开炼机上加入2.1%硫化剂、2.1%发泡剂,混炼均匀后出片停放4~36小时。
按重量百分比在密炼机中加入42.4%EPDM橡胶,密炼3分钟,将2.5%活性剂、27.5%补强剂、25.4%软化剂分三次投入密炼机,每次密炼5分钟,最后升温至135℃排料,在开炼机上出片停放8~24小时后在开炼机上加入2.2%硫化剂,混炼均匀后出片停放4~36小时。
将EPDM高分子发泡混炼胶料放入块状模具内,用螺丝锁死后放入平板硫化机,150℃*20分钟后将模具取出,放入冷水中,冷却至40℃以下,将螺丝打开,取出硫化发泡好的块状发泡材料。然后用分切机切成所需厚度。用刀模冲切至所需形状尺寸。
将EPDM高分子不发泡混炼胶料剪成1~2克的小块,用二甲苯做溶剂,按胶料:溶剂=1:5的比例配成胶浆,用搅拌机搅拌1小时,停放4~36小时。
将冲切好的EPDM发泡材料浸泡入胶浆内2~5秒,取出悬挂晾干,重复3次,放入密封圈模具内,用螺丝锁死,放入烘箱,190℃*10分钟后将模具取出,放入冷水中,冷却至40℃以下,将螺丝打开,取出即得EPDM高分子发泡车灯密封圈成品。
所制得的EPDM高分子发泡车灯密封圈硬度15~25SHC。
实施例2:
按重量百分比在密炼机中加入40.7%EPDM橡胶,密炼3分钟,将2.4%活性剂、36.6%补强剂、16.3%软化剂分三次投入密炼机,每次密炼5分钟,最后升温至140℃排料,在开炼机上出片停放8~24小时后在开炼机上加入2%硫化剂、2%发泡剂,混炼均匀后出片停放4~36小时。
按重量百分比在密炼机中加入41.5%EPDM橡胶,密炼3分钟,将2.5%活性剂、37.3%补强剂、16.6%软化剂分三次投入密炼机,每次密炼5分钟,最后升温至135℃排料,在开炼机上出片停放8~24小时后在开炼机上加入2.1%硫化剂,混炼均匀后出片停放4~36小时。
将EPDM高分子发泡混炼胶料放入块状模具内,用螺丝锁死后放入平板硫化机,150℃*20分钟后将模具取出,放入冷水中,冷却至40℃以下,将螺丝打开,取出硫化发泡好的块状发泡材料。然后用分切机切成所需厚度。用刀模冲切至所需形状尺寸。
将EPDM高分子不发泡混炼胶料剪成1~2克的小块,用二甲苯做溶剂,按胶料:溶剂=1:4的比例配成胶浆,用搅拌机搅拌1小时,停放4~36小时。
将冲切好的EPDM发泡材料浸泡入胶浆内2~5秒,取出悬挂晾干,重复5次,放入密封圈模具内,用螺丝锁死,放入烘箱,190℃*10分钟后将模具取出,放入冷水中,冷却至40℃以下,将螺丝打开,取出即得EPDM高分子发泡车灯密封圈成品。
所制得的EPDM高分子发泡车灯密封圈硬度25~35SHC。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (1)
1.一种EPDM高分子发泡车灯密封圈的制备方法,其特征是,包括以下步骤:
(1)按重量百分比在密炼机中加入40.7%EPDM橡胶,密炼3分钟,将2.4%活性剂、36.6%补强剂、16.3%软化剂分三次投入密炼机,每次密炼5分钟,最后升温至140℃排料,在开炼机上出片停放8~24小时后在开炼机上加入2%硫化剂、2%发泡剂,混炼均匀后出片停放4~36小时,得到EPDM高分子发泡混炼胶料;
按重量百分比在密炼机中加入41.5%EPDM橡胶,密炼3分钟,将2.5%活性剂、37.3%补强剂、16.6%软化剂分三次投入密炼机,每次密炼5分钟,最后升温至135℃排料,在开炼机上出片停放8~24小时后在开炼机上加入2.1%硫化剂,混炼均匀后出片停放4~36小时,得到EPDM高分子不发泡混炼胶料;
将EPDM高分子发泡混炼胶料放入块状模具内,用螺丝锁死后放入平板硫化机,150℃*20分钟后将模具取出,放入冷水中,冷却至40℃以下,将螺丝打开,取出硫化发泡好的块状发泡材料,然后用分切机切成所需厚度,用刀模冲切至所需形状尺寸;
(2)将EPDM高分子不发泡混炼胶料剪成1~2克的小块,用二甲苯做溶剂,按胶料:溶剂=1:4的比例配成胶浆,用搅拌机搅拌1小时,停放4~36小时;
(3)将冲切好的EPDM发泡材料浸泡入胶浆内2~5秒,取出悬挂晾干,重复5次,放入密封圈模具内,190℃下10分钟后再冷却至40℃以下,即得EPDM高分子发泡车灯密封圈。
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