CN108485080A - 一种三元乙丙橡胶海绵密封材料及其制备方法 - Google Patents

一种三元乙丙橡胶海绵密封材料及其制备方法 Download PDF

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CN108485080A
CN108485080A CN201810298080.1A CN201810298080A CN108485080A CN 108485080 A CN108485080 A CN 108485080A CN 201810298080 A CN201810298080 A CN 201810298080A CN 108485080 A CN108485080 A CN 108485080A
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江蔓青
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Abstract

本发明公开了一种三元乙丙橡胶海绵密封材料，通过以下几个步骤制成：三元乙丙橡胶与硫化剂、促进剂、交联剂、发泡剂、防老剂、活性剂和补强剂在加压式混炼机中常温混炼，制得混炼胶；混炼后的胶静置后，在双辊压延机上将混炼胶挤出机成型为未交联的胶片；未交联的胶片在热空气烘道中辅以微波，分段式加热，进行交联发泡；胶片通过开炼机，使发泡微孔连续化，切片后得到三元乙丙橡胶发泡胶片。本发明在一段硫化中引入微波并进行分段式加热促进交联发泡，生产密度为0.5g/cm3以下的高发泡倍率，压缩永久变形小，且厚度及体积复原性优良的三元乙丙橡胶交联发泡密封材料，发泡海绵体的缓冲性和压缩性好。

Description

一种三元乙丙橡胶海绵密封材料及其制备方法
技术领域
本发明涉及橡胶海绵，尤其是涉及一种三元乙丙橡胶海绵密封材料及其制备方法。
背景技术
普通的橡胶海绵主要选用天然橡胶、丁苯橡胶、丁二烯橡胶，要求耐热、耐臭氧老化时，可选用三元乙丙橡胶。从使用寿命、工艺、成本等综合考虑，三元乙丙橡胶也是较为理想的胶种，因此广泛用于制造民用及工业橡胶海绵制品。
传统三元乙丙橡胶非海绵橡胶用有机过氧化物交联，所形成的C—C键的结合能比硫黄交联形成的C—S键的结合能大，借此提高了制品的耐热性和降低了压缩永久变形。由于永久变形的缘故,密封材料的弹性减弱，因而，它的密封性能大幅度降低。为此，迫切希望有这样一种产品，当它受到压缩时不易产生永久变形，而压力解除后体积复原性优良。
发明内容
本发明的目的在于，提供一种三元乙丙橡胶海绵密封材料及其制备方法。
为此，本发明采用以下技术方案：
一种三元乙丙橡胶海绵密封材料，通过以下几个步骤制成：
A混炼：三元乙丙橡胶与硫化剂、促进剂DM、交联剂DCP、发泡剂、防老剂、活性剂和补强剂炭黑在加压式混炼机中常温混炼，制得混炼胶；
B成型：混炼后的胶静置后，在双辊压延机上将混炼胶挤出机成型为未交联的胶片；
C一段硫化：未交联的胶片在热空气烘道中辅以微波，分段式加热，进行交联发泡；
D二段硫化：胶片通过开炼机，使发泡微孔连续化，切片后得到三元乙丙橡胶发泡胶片。
混炼步骤中的原料组份如下(质量)：三元乙丙橡胶100份，硫化剂10-20份，促进剂2-4份，交联剂1-2份，发泡剂5-10份，防老剂1-2份，活性剂6-8份，补强剂10-20份。
优选地，硫化剂为过氧化二异丙苯(有效含量40％)与1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)其中的一种或二者混合物；发泡剂为偶氮二甲酰胺或碳酸氢钠其中一种；防老剂为2,2,4-三甲基-1，2-对苯二酚聚合体；活性剂为氧化锌和硬脂酸其中的一种或二者混合物。
一段硫化步骤中辅助微波功率为1000-1300W。分段式加热步骤为：在100-120℃的热空气烘道中，停放20-30min，随后在160-180℃下再加热进行交联发泡。
二段硫化步骤中开炼温度为160-180℃。
本发明具有如下有益效果：
本发明一段硫化中引入微波并进行分段式加热促进交联发泡，生产密度为0.5g/cm3以下的高发泡倍率，压缩永久变形小，且厚度及体积复原性优良的三元乙丙橡胶交联发泡密封材料，发泡海绵体的缓冲性和压缩性好。
具体实施方式
实施例1：
将三元乙丙橡胶100份，过氧化二异丙苯(有效含量40％)10份与1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)5份，DM 3份，DCP1份，偶氮二甲酰胺6份，2,2,4-三甲基-1，2-对苯二酚聚合体1份，氧化锌3份，硬脂酸3份，炭黑15份，在加压式混炼机中常温混炼，制得混炼胶，再经挤出机成型为未交联的胶片，辅助微波功率为1200W，在100℃的热空气烘道中，停放20min，随后在160℃下再加热进行交联发泡。而后，胶片通过开炼机，开炼温度为160℃，使发泡微孔连续化，切片后得到厚度为10mm的三元乙丙橡胶发泡胶片。
实施例2：
将三元乙丙橡胶100份，过氧化二异丙苯(有效含量40％)10份，1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)10份，DM 4份，DCP1.5份，偶氮二甲酰胺8份，2,2,4-三甲基-1，2-对苯二酚聚合体2份，氧化锌3份，硬脂酸4份，炭黑20份，在加压式混炼机中常温混炼，制得混炼胶，再经挤出机成型为未交联的胶片，辅助微波功率为1200W，在120℃的热空气烘道中，停放20min，随后在160℃下再加热进行交联发泡。而后，胶片通过开炼机，开炼温度为160℃，使发泡微孔连续化，切片后得到厚度为10mm的三元乙丙橡胶发泡胶片。
实施例3：
将三元乙丙橡胶100份，过氧化二异丙苯(有效含量40％)5份，1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)10份，DM 4份，DCP1份，碳酸氢钠10份，2,2,4-三甲基-1，2-对苯二酚聚合体2份，氧化锌4份，硬脂酸4份，炭黑20份，在加压式混炼机中混炼，制得混炼胶，再经挤出机成型为未交联的胶片，辅助微波功率为1300W，在120℃的热空气烘道中，停放30min，随后在180℃下再加热进行交联发泡。而后，胶片通过开炼机，开炼温度为180℃，使发泡微孔连续化，切片后得到厚度为10mm的三元乙丙橡胶发泡胶片。
实施例4：
将三元乙丙橡胶100份，过氧化二异丙苯(有效含量40％)5份，1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)8份，DM 2.5份，DCP1份，碳酸氢钠8份，2,2,4-三甲基-1，2-对苯二酚聚合体1.5份，氧化锌2份，硬脂酸6份，炭黑18份，在加压式混炼机中混炼，制得混炼胶，再经挤出机成型为未交联的胶片，辅助微波功率为1000W，在100℃的热空气烘道中，停放20min，随后在180℃下再加热进行交联发泡。而后，胶片通过开炼机，开炼温度为180℃，使发泡微孔连续化，切片后得到厚度为10mm的三元乙丙橡胶发泡胶片。
实施例5：
将三元乙丙橡胶100份，过氧化二异丙苯(有效含量40％)5份，1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)10份，DM 2份，DCP2份，偶氮二甲酰胺8份，2,2,4-三甲基-1，2-对苯二酚聚合体2份，氧化锌2份，硬脂酸5份，炭黑15份，在加压式混炼机中混炼，制得混炼胶，再经挤出机成型为未交联的胶片，辅助微波功率为1300W，在120℃的热空气烘道中，停放30min，随后在170℃下再加热进行交联发泡。而后，胶片通过开炼机，开炼温度为170℃，使发泡微孔连续化，切片后得到厚度为10mm的三元乙丙橡胶发泡胶片。
测定结果如下表所示
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (9)

1.一种三元乙丙橡胶海绵密封材料，其特征在于，通过以下几个步骤制成：
A混炼：三元乙丙橡胶与硫化剂、促进剂DM、交联剂DCP、发泡剂、防老剂、活性剂和补强剂炭黑在加压式混炼机中常温混炼，制得混炼胶；
B成型：混炼后的胶静置后，在双辊压延机上将混炼胶挤出机成型为未交联的胶片；
C一段硫化：未交联的胶片在热空气烘道中辅以微波，分段式加热，进行交联发泡；
D二段硫化：胶片通过开炼机，使发泡微孔连续化，切片后得到三元乙丙橡胶发泡胶片。
2.根据权利要求1所述的一种三元乙丙橡胶海绵密封材料，其特征在于，所述的混炼步骤中的原料组份如下(质量)：三元乙丙橡胶100份，硫化剂10-20份，促进剂2-4份，交联剂1-2份，发泡剂5-10份，防老剂1-2份，活性剂6-8份，补强剂10-20份。
3.根据权利要求1或2所述的一种三元乙丙橡胶海绵密封材料，其特征在于，硫化剂为过氧化二异丙苯(有效含量40％)与1,1-叔丁基过氧化-3,3,5-三甲基环己烷(有效含量40％)其中的一种或二者混合物。
4.根据权利要求1或2所述的一种三元乙丙橡胶海绵密封材料，其特征在于，发泡剂为偶氮二甲酰胺或碳酸氢钠其中一种。
5.根据权利要求1或2所述的一种三元乙丙橡胶海绵密封材料，其特征在于，防老剂为2,2,4-三甲基-1，2-对苯二酚聚合体。
6.根据权利要求1或2所述的一种三元乙丙橡胶海绵密封材料，其特征在于，活性剂为氧化锌和硬脂酸其中的一种或二者混合物。
7.根据权利要求1所述的一种三元乙丙橡胶海绵密封材料，其特征在于，所述的一段硫化步骤中微波功率为1000-1300W。
8.根据权利要求1所述的一种三元乙丙橡胶海绵密封材料，其特征在于，所述的一段硫化步骤中分段式加热步骤为在100-120℃的热空气烘道中停放20-30min，随后在160-180℃下再加热进行交联发泡。
9.根据权利要求1所述的一种三元乙丙橡胶海绵密封材料，其特征在于，所述的二段硫化步骤中开炼温度为160-180℃。
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