CN111533971B - 一种耐低温橡塑制品及其制备方法 - Google Patents
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Abstract
本发明属于橡塑制品技术领域,提出了一种耐低温橡塑制品及其制备方法,包括以下重量份的组分:丁腈橡胶15~20份,顺丁橡胶2~3份,聚氯乙烯树脂4~7份,发泡剂4~7份,炭黑3~5份,橡胶操作油10~13份,低温改性剂4~7份,活性剂0.3~0.5份,硬脂酸0.1~0.3份,三聚磷酸铝5~9份,偏硼酸钡3~5份,填料10~12份,防护蜡3~5份,促进剂2~4份,硫化剂0.1~0.3份,所述低温改性剂由以下重量份的组分组成:癸二酸二辛酯5~8份,聚二甲基硅氧烷3~5份,N‑甲基吡咯烷酮0.5~1份,三苯基甲烷三异氰酸酯2.5~4份。通过上述技术方案,解决了现有技术中的橡塑制品的最低使用温度只能达到‑20℃、耐低温性差的问题。
Description
技术领域
本发明属于橡塑制品技术领域,涉及一种耐低温橡塑制品及其制备方法。
背景技术
橡胶和塑胶制品的简称为橡塑制品,橡塑制品被广泛运用于工业、民用、军事等领域。现有的橡塑绝热制品一般是使用丁腈橡胶和聚氯乙烯树脂为主体材料,添加其他辅助材料高温共混,然后加入硫化剂和发泡剂经过硫化发泡得到。目前生产的橡塑制品使用温度最低只能达到-20℃,限制了橡塑制品的使用环境。
发明内容
本发明提出一种耐低温橡塑制品及其制备方法,解决了现有技术中的橡塑制品的最低使用温度只能达到-20℃、耐低温性差的问题。
本发明的技术方案是这样实现的:
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶15~20份,顺丁橡胶2~3份,聚氯乙烯树脂4~7份,发泡剂4~7份,炭黑3~5份,橡胶操作油10~13份,低温改性剂4~7份,活性剂0.3~0.5份,硬脂酸0.1~0.3份,三聚磷酸铝5~9份,偏硼酸钡3~5份,填料10~12份,防护蜡3~5份,促进剂2~4份,硫化剂0.1~0.3份,
所述低温改性剂由以下重量份的组分组成:
癸二酸二辛酯5~8份,聚二甲基硅氧烷3~5份,N-甲基吡咯烷酮0.5~1份,三苯基甲烷三异氰酸酯2.5~4份。
作为进一步的技术方案,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份,
所述低温改性剂由以下重量份的组分组成:
癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份。
作为进一步的技术方案,所述丁腈橡胶中丙烯腈含量为27~29%。
作为进一步的技术方案,所述活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物,所述促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺。
作为进一步的技术方案,所述发泡剂为偶氮二甲酰胺、二苯磺酰肼醚或对甲苯磺酰肼。
作为进一步的技术方案,所述填料为滑石粉、石英粉、重钙粉中的一种或多种。
本发明还公开了一种耐低温橡塑制品的制备方法,包括以下步骤:
A、按照上述的耐低温橡塑制品的配方,称取各组分备用;
B、将丁腈橡胶、顺丁橡胶、聚氯乙烯树脂、炭黑、橡胶操作油、低温改性剂、硬脂酸、三聚磷酸铝、偏硼酸钡、填料、防护蜡共混,待共混料达到160℃排料,得到混合胶料;
C、向混合胶料加入活性剂,降温复炼后下片,冷却后得到胶片;
D、向胶片中加入发泡剂、硫化剂和促进剂,混炼均匀后出条,得到胶条;
E、将胶条挤出成型,硫化发泡,冷却,得到耐低温橡塑制品。
作为进一步的技术方案,步骤C中降温至80℃。
作为进一步的技术方案,步骤D中向胶片中加入发泡剂、硫化剂和促进剂前先将胶片存放24小时。
作为进一步的技术方案,步骤E中硫化发泡依次在8段递增温度下进行,所述8段递增温度分别为120℃、125℃、130℃、135℃、140℃、150℃、160℃、170℃。
本发明的工作原理及有益效果为:
1、本发明中,通过对橡塑制品的配方及制备方法进行优化设计,使得制备的橡塑制品的低温脆性显著改善,在-50℃无损坏,耐低温性显著提高,有效解决了现有技术中的橡塑制品最低只能在-20℃使用的问题。此外,本发明的橡塑制品的的拉伸强度高达23.5MPa,在温度23℃±2℃、相对湿度50%±5%的环境条件下压缩时间72h±0.2h的压缩永久变形低至12.8%,氧指数高达48%,氯离子含量低至82ppm。因此,本发明的橡塑制品良好的耐低温性,还具有高的拉伸强度、抗压缩性和阻燃性,以及低的氯离子含量,适合推广使用。
2、本发明中,低温改性剂由癸二酸二辛酯、聚二甲基硅氧烷、N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯组成,癸二酸二辛酯与聚二甲基硅氧烷、N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯配伍,将橡塑制品的低温脆性提高至-50℃无损坏,显著提高了橡塑制品的耐低温性;这是由于一个方面,癸二酸二辛酯、聚二甲基硅氧烷具有良好的耐低温性,加入橡塑制品中显著提高了橡塑制品的耐低温性,另一方面,聚二甲基硅氧烷与N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯配伍,提高了癸二酸二辛酯与橡塑基体的相容性,使得癸二酸二辛酯的耐低温效果更好的发挥,同时,聚二甲基硅氧烷与N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯配伍,有效避免了癸二酸二辛酯在橡塑基体中的迁移,从而进一步促进了癸二酸二辛酯功效的发挥,使得橡塑制品具有更好的耐低温性。
3、本发明中,橡塑制品的原料中加入偏硼酸钡和三聚磷酸铝,偏硼酸钡和三聚磷酸铝配伍,不仅提高了橡塑制品的阻燃性,还显著降低了橡塑制品中的氯离子含量,将氯离子含量降低至82ppm。偏硼酸钡和三聚磷酸铝协同作用,可以将橡塑制品中析出的氯离子吸附并固定在稳定的晶体中,从而显著降低橡塑制品中的氯离子含量。
4、本发明中,橡塑制品的原料中加入活性剂,活性剂中纳米氧化锌与马来酸酐配伍,显著提高了橡塑制品的机械性能。纳米氧化锌作为硫化活性剂,在硫化过程中,纳米氧化锌与促进剂、硫化剂、橡胶大分子链以及相应的中间产物都发生交联反应,显著提高了硫化过程中化学交联键的形成速度,丰富了交联键类型和数量,从而提高了橡塑制品的交联程度,进而提高橡塑制品的机械性能。纳米氧化锌因具有大比表面积和界面效应等而使高活性的表面极易凝聚、结团,从而在橡塑基体中的分散性差。马来酸酐的加入,显著提高了纳米氧化锌的分散性,避免了纳米氧化锌在橡塑基体中的团聚,使得纳米氧化锌在橡塑制品中更好的发挥其功效,进而提高了橡塑制品的机械性能。
具体实施方式
下面将结合本发明实施例,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。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶15份,顺丁橡胶2份,聚氯乙烯树脂4份,发泡剂4份,炭黑3份,橡胶操作油10份,低温改性剂4份,活性剂0.3份,硬脂酸0.1份,三聚磷酸铝5份,偏硼酸钡3份,填料10份,防护蜡3份,促进剂2份,硫化剂0.1份;
其制备方法包括以下步骤:
A、按照上述的耐低温橡塑制品的配方,称取各组分备用;
B、将丁腈橡胶、顺丁橡胶、聚氯乙烯树脂、炭黑、橡胶操作油、低温改性剂、硬脂酸、三聚磷酸铝、偏硼酸钡、填料、防护蜡投入密炼机共混,待共混料达到160℃排料,得到混合胶料;
C、将混合胶料排料至开炼机,加入活性剂,降温复炼至温度降至80℃,下片,自然冷却后得到胶片;
D、将胶片存放24小时后送至开炼机,加入发泡剂、硫化剂和促进剂,混炼均匀后出条,得到胶条;
E、将胶条通过挤出机挤出成型,送入烘箱进行硫化发泡,烘箱温度为8段递增温度:120℃、125℃、130℃、135℃、140℃、150℃、160℃、170℃,硫化发泡后冷却得到耐低温橡塑制品;
其中,低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为偶氮二甲酰胺;填料为滑石粉。
实施例2
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶20份,顺丁橡胶3份,聚氯乙烯树脂7份,发泡剂7份,炭黑5份,橡胶操作油13份,低温改性剂7份,活性剂0.5份,硬脂酸0.3份,三聚磷酸铝9份,偏硼酸钡5份,填料12份,防护蜡5份,促进剂4份,硫化剂0.3份;低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为偶氮二甲酰胺;填料为滑石粉;
其制备方法同实施例1。
实施例3
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份;低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为偶氮二甲酰胺;填料为滑石粉;
其制备方法同实施例1。
实施例4
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份;低温改性剂由以下重量份的组分组成:癸二酸二辛酯5份,聚二甲基硅氧烷3份,N-甲基吡咯烷酮0.5份,三苯基甲烷三异氰酸酯2.5份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为偶氮二甲酰胺;填料为滑石粉;
其制备方法同实施例1。
实施例5
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份;低温改性剂由以下重量份的组分组成:癸二酸二辛酯8份,聚二甲基硅氧烷5份,N-甲基吡咯烷酮1份,三苯基甲烷三异氰酸酯4份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为偶氮二甲酰胺;填料为滑石粉;
其制备方法同实施例1。
实施例6
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份;低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为二苯磺酰肼醚;填料为石英粉;
其制备方法同实施例1。
实施例7
一种耐低温橡塑制品,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份;低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份;活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物;促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺;发泡剂为对甲苯磺酰肼;填料为重钙粉;
其制备方法同实施例1。
对比例1
本对比例与实施例3的区别仅在于橡塑制品的配方中未加入三聚磷酸铝。
对比例2
本对比例与实施例3的区别仅在于橡塑制品的配方中未加入偏硼酸钡。
对比例3
本对比例与实施例3的区别仅在于低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份。
对比例4
本对比例与实施例3的区别仅在于低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份。
对比例5
本对比例与实施例3的区别仅在于低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,聚二甲基硅氧烷4份,三苯基甲烷三异氰酸酯3份。
对比例6
本对比例与实施例3的区别仅在于低温改性剂由以下重量份的组分组成:癸二酸二辛酯7份,邻苯二甲酸二异癸酯7份。
对比例7
本对比例与实施例3的区别仅在于活性剂为纳米氧化锌。
对比例8
本对比例与实施例3的区别仅在于活性剂为纳米氧化锌与N,N’-间苯撑双马来酰亚胺质量比1:2的混合物。
对实施例1~7及对比例1~8得到的橡塑制品进行如下测试:
1、低温脆性:按照GB/T1682-1994《硫化橡胶低温脆性的测定单试样法》中规定的测试方法,测试样品的低温脆性;
2、拉伸强度:按照GB/T528-2009《硫化橡胶或热塑性橡胶拉伸应力应变性能的测定》中规定的测试方法,测试样品的拉伸强度;
3、抗压缩性能:按照GB/T 6669-2008《软质泡沫聚合材料压缩永久变形的测定》中规定的方法B进行压缩,分别测试样品在温度23℃±2℃、相对湿度50%±5%的环境条件下压缩时间72h±0.2h的压缩永久变形;
4、阻燃性:按照GB/T 2406.2-2009《塑料用氧指数法测定燃烧行为第2部分:室温试验》中规定的方法,测试样品的阻燃性;
5、氯离子含量:以实施例1~7及对比例1~8的橡塑制品为测试样品,分别取1g样品,将样品放入100毫升的密闭容器中,向容器中加入40毫升纯净水,盖上密封盖,手动震荡约30秒,使样品沾满水分,并在90℃的条件下静置24小时;取出密闭容器时再手动震荡30秒,待溶液冷却后,取出液体,采用离子色谱仪分析浸泡液中氯离子含量;将浸泡液的离子含量转换为发泡制品的氯离子含量;
测试结果见下表1:
表1实施例1~7及对比例1~8的橡塑制品测试结果
组别 | 低温脆性 | 拉伸强度/MPa | 压缩永久变形/% | 氧指数/% | 氯离子含量(ppm) |
实施例1 | -50℃无损坏 | 22.8 | 13.1 | 45 | 86 |
实施例2 | -50℃无损坏 | 23.4 | 12.9 | 48 | 87 |
实施例3 | -50℃无损坏 | 23.6 | 12.8 | 47 | 82 |
实施例4 | -50℃无损坏 | 23.3 | 12.9 | 43 | 84 |
实施例5 | -50℃无损坏 | 23.5 | 13.2 | 44 | 89 |
实施例6 | -50℃无损坏 | 23.1 | 13.3 | 46 | 86 |
实施例7 | -50℃无损坏 | 23.3 | 13.2 | 46 | 85 |
对比例1 | -50℃无损坏 | 21.5 | 13.8 | 29 | 457 |
对比例2 | -50℃无损坏 | 21.8 | 13.5 | 32 | 381 |
对比例3 | -40℃无损坏 | 22.4 | 13.6 | 41 | 105 |
对比例4 | -30℃无损坏 | 22.1 | 13.9 | 44 | 96 |
对比例5 | -45℃无损坏 | 21.9 | 13.7 | 43 | 102 |
对比例6 | -35℃无损坏 | 22.1 | 13.8 | 46 | 99 |
对比例7 | -50℃无损坏 | 17.5 | 14.7 | 44 | 95 |
对比例8 | -50℃无损坏 | 20.2 | 14.3 | 42 | 98 |
从上表中数据可以看出,实施例1~7制备的橡塑制品的低温脆性显著改善,在-50℃无损坏,耐低温性显著提高,有效解决了现有技术中的橡塑制品最低只能在-20℃使用的问题。此外,实施例1~7的橡塑制品的拉伸强度高达23.5MPa,在温度23℃±2℃、相对湿度50%±5%的环境条件下压缩时间72h±0.2h的压缩永久变形低至12.8%,氧指数高达48%,氯离子含量低至82ppm。因此,本发明的橡塑制品良好的耐低温性,还具有高的拉伸强度、抗压缩性和阻燃性,以及低的氯离子含量,适合推广使用。
与实施例3的橡塑制品相比,对比例1~2的橡塑制品的氧指数显著降低,氯离子含量明显升高,对比例1的橡塑制品配方中未加入三聚磷酸铝,对比例2的橡塑制品配方中未加入偏硼酸钡,说明橡塑制品的原料配方中偏硼酸钡和三聚磷酸铝配伍,不仅提高了橡塑制品的阻燃性,还显著降低了橡塑制品中的氯离子含量。偏硼酸钡和三聚磷酸铝协同作用,可以将橡塑制品中析出的氯离子吸附并固定在稳定的晶体中,从而显著降低橡塑制品中的氯离子含量。
与实施例3的橡塑制品相比,对比例3~6的橡塑制品的低温脆显著降低,对比例3的橡塑制品配方低温改性剂中未加入聚二甲基硅氧烷,对比例4的橡塑制品配方低温改性剂中未加入三苯基甲烷三异氰酸酯,对比例5的橡塑制品配方低温改性剂中未加入N-甲基吡咯烷酮,对比例6的橡塑制品配方低温改性剂为癸二酸二辛酯和邻苯二甲酸二异癸酯,说明本发明中低温改性剂由癸二酸二辛酯、聚二甲基硅氧烷、N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯组成,癸二酸二辛酯与聚二甲基硅氧烷、N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯配伍,将橡塑制品的低温脆性提高至-50℃无损坏,显著提高了橡塑制品的耐低温性;这是由于一个方面,癸二酸二辛酯、聚二甲基硅氧烷具有良好的耐低温性,加入橡塑制品中显著提高了橡塑制品的耐低温性,另一方面,聚二甲基硅氧烷与N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯配伍,提高了癸二酸二辛酯与橡塑基体的相容性,使得癸二酸二辛酯的耐低温效果更好的发挥,同时,聚二甲基硅氧烷与N-甲基吡咯烷酮、三苯基甲烷三异氰酸酯配伍,有效避免了癸二酸二辛酯在橡塑基体中的迁移,从而进一步促进了癸二酸二辛酯功效的发挥,使得橡塑制品具有更好的耐低温性。
与实施例3的橡塑制品相比,对比例7~8的橡塑制品的拉伸强度、压缩永久变形显著降低,对比例7的橡塑制品配方活性剂中未加入马来酸酐,对比例8的橡塑制品配方活性剂为纳米氧化锌与N,N’-间苯撑双马来酰亚胺质量比1:2的混合物,说明本发明中活性剂中纳米氧化锌与马来酸酐配伍,显著提高了橡塑制品的机械性能。纳米氧化锌作为硫化活性剂,在硫化过程中,纳米氧化锌与促进剂、硫化剂、橡胶大分子链以及相应的中间产物都发生交联反应,显著提高了硫化过程中化学交联键的形成速度,丰富了交联键类型和数量,从而提高了橡塑制品的交联程度,进而提高橡塑制品的机械性能。纳米氧化锌因具有大比表面积和界面效应等而使高活性的表面极易凝聚、结团,从而在橡塑基体中的分散性差。马来酸酐的加入,显著提高了纳米氧化锌的分散性,避免了纳米氧化锌在橡塑基体中的团聚,使得纳米氧化锌在橡塑制品中更好的发挥其功效,进而提高了橡塑制品的机械性能。
以上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、改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.一种耐低温橡塑制品,其特征在于,包括以下重量份的组分:
丁腈橡胶15~20份,顺丁橡胶2~3份,聚氯乙烯树脂4~7份,发泡剂4~7份,炭黑3~5份,橡胶操作油10~13份,低温改性剂4~7份,活性剂0.3~0.5份,硬脂酸0.1~0.3份,三聚磷酸铝5~9份,偏硼酸钡3~5份,填料10~12份,防护蜡3~5份,促进剂2~4份,硫化剂0.1~0.3份,
所述低温改性剂由以下重量份的组分组成:
癸二酸二辛酯5~8份,聚二甲基硅氧烷3~5份,N-甲基吡咯烷酮0.5~1份,三苯基甲烷三异氰酸酯2.5~4份。
2.根据权利要求1所述的一种耐低温橡塑制品,其特征在于,包括以下重量份的组分:
丁腈橡胶17份,顺丁橡胶3份,聚氯乙烯树脂5份,发泡剂5份,炭黑4份,橡胶操作油11份,低温改性剂5份,活性剂0.4份,硬脂酸0.2份,三聚磷酸铝7份,偏硼酸钡4份,填料11份,防护蜡4份,促进剂3份,硫化剂0.2份,
所述低温改性剂由以下重量份的组分组成:
癸二酸二辛酯7份,聚二甲基硅氧烷4份,N-甲基吡咯烷酮0.6份,三苯基甲烷三异氰酸酯3份。
3.根据权利要求1或2所述的一种耐低温橡塑制品,其特征在于,所述丁腈橡胶中丙烯腈含量为27~29%。
4.根据权利要求3所述的一种耐低温橡塑制品,其特征在于,所述活性剂为纳米氧化锌与马来酸酐质量比1:2的混合物,所述促进剂为N-氧二亚乙基-2-苯并噻唑次磺酰胺,所述硫化剂为硫磺。
5.根据权利要求4所述的一种耐低温橡塑制品,其特征在于,所述发泡剂为偶氮二甲酰胺、二苯磺酰肼醚或对甲苯磺酰肼。
6.根据权利要求4所述的一种耐低温橡塑制品,其特征在于,所述填料为滑石粉、石英粉、重钙粉中的一种或多种。
7.一种耐低温橡塑制品的制备方法,其特征在于,包括以下步骤:
A、按照权利要求1~6任意一项所述的一种耐低温橡塑制品的配方,称取各组分备用;
B、将丁腈橡胶、顺丁橡胶、聚氯乙烯树脂、炭黑、橡胶操作油、低温改性剂、硬脂酸、三聚磷酸铝、偏硼酸钡、填料、防护蜡共混,待共混料达到160℃排料,得到混合胶料;
C、向混合胶料加入活性剂,降温复炼后下片,冷却后得到胶片;
D、向胶片中加入发泡剂、硫化剂和促进剂,混炼均匀后出条,得到胶条;
E、将胶条挤出成型,硫化发泡,冷却,得到耐低温橡塑制品。
8.根据权利要求7所述的一种耐低温橡塑制品的制备方法,其特征在于,步骤C中降温至80℃。
9.根据权利要求7所述的一种耐低温橡塑制品的制备方法,其特征在于,步骤D中向胶片中加入发泡剂、硫化剂和促进剂前先将胶片存放24小时。
10.根据权利要求7所述的一种耐低温橡塑制品的制备方法,其特征在于,步骤E中硫化发泡依次在8段递增温度下进行,所述8段递增温度分别为120℃、125℃、130℃、135℃、140℃、150℃、160℃、170℃。
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