CN116589768B - 一种超薄辐照交联聚乙烯泡棉及其制备方法 - Google Patents
一种超薄辐照交联聚乙烯泡棉及其制备方法 Download PDFInfo
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Abstract
本发明属于聚乙烯泡棉技术领域,公开了一种超薄辐照交联聚乙烯泡棉及其制备方法。该聚乙烯泡棉的原料组成为:高密度聚乙烯60~80份,线性低密度聚乙烯10~25份,乙烯共聚物10~20份,三元乙丙橡胶3~10份,酚醛树脂5~10份,发泡剂3~5份,敏化剂0.5~2份,成核剂0.1~1份,抗氧剂0.5~2份,交联剂0.5~3份。本发明以高密度聚乙烯为主体树脂,添加少量线性低密度聚乙烯增加韧性;热固性酚醛树脂在熔融挤出以及高温发泡过程中固化,形成高刚性的聚合网络,提高了聚乙烯的刚性,有效防止泡棉拉薄后泡孔形变大,尺寸不稳定的问题;三元乙丙橡胶可改善泡棉的回弹性以及韧性,使泡棉具有良好的力学性能。
Description
技术领域
本发明涉及聚乙烯泡棉技术领域,尤其涉及一种超薄辐照交联聚乙烯泡棉及其制备方法。
背景技术
辐照交联聚乙烯泡棉因其密度低、弹性、韧性、耐磨性、耐化学腐蚀性、耐低温性和绝缘性等性能优异,可作为良好的缓冲减震、保温隔热、绝缘及浮力材料,广泛应用于工业、农业、航空航天和交通运输等各个领域。
随着电子科技产品的精密化发展,对电子零部件的内部保护提出了更高的要求,超薄辐照交联聚乙烯泡棉应需而生,目前市面上的超薄片多采用低密度聚乙烯为主体树脂,添加发泡剂、敏化剂进行低倍高温化学发泡后,再经高温拉薄成0.3mm以下的超薄辐照交联聚乙烯泡棉。但是聚乙烯片材偏软,尤其是0.2mm以下的薄片在收卷时易皱缩,增加了整套工序的加工难度,并且拉薄后的泡棉易产生泡孔破裂变形,尺寸不稳定等问题。
因此,如何提供一种尺寸稳定、力学性能优异的超薄聚乙烯泡棉对聚乙烯发泡产品的广泛应用具有重要意义。
发明内容
本发明的目的在于提供一种超薄辐照交联聚乙烯泡棉及其制备方法,解决现有技术提供的超薄聚乙烯泡棉存在的上述问题。
为了实现上述发明目的,本发明提供以下技术方案:
本发明提供了一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯60~80份,线性低密度聚乙烯10~25份,乙烯共聚物10~20份,三元乙丙橡胶3~10份,酚醛树脂5~10份,发泡剂3~5份,敏化剂0.5~2份,成核剂0.1~1份,抗氧剂0.5~2份,交联剂0.5~3份。
优选的,在上述一种超薄辐照交联聚乙烯泡棉中,所述乙烯共聚物为乙烯-醋酸乙烯酯共聚物和马来酸酐接枝乙烯辛烯共聚物;乙烯-醋酸乙烯酯共聚物和马来酸酐接枝乙烯辛烯共聚物的质量比为1~3:2~5。
优选的,在上述一种超薄辐照交联聚乙烯泡棉中,所述酚醛树脂为热固性酚醛树脂。
优选的,在上述一种超薄辐照交联聚乙烯泡棉中,所述敏化剂为氧化锌和硬脂酸钙中的一种或两种。
优选的,在上述一种超薄辐照交联聚乙烯泡棉中,所述成核剂为滑石粉和碳酸钙中的一种或两种。
优选的,在上述一种超薄辐照交联聚乙烯泡棉中,所述交联剂为三烯丙基异氰酸酯。
本发明还提供了一种超薄辐照交联聚乙烯泡棉的制备方法,包括以下步骤:
(1)将线性低密度聚乙烯、乙烯共聚物、发泡剂密炼后造粒,得到发泡母粒;
将高密度聚乙烯、敏化剂、成核剂、抗氧剂、交联剂密炼后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、酚醛树脂熔融挤出,得到片材;
(3)将片材进行电子辐照后进行发泡,然后进行拉薄,得到超薄辐照交联聚乙烯泡棉。
优选的,在上述一种超薄辐照交联聚乙烯泡棉的制备方法中,所述步骤(1)中发泡母粒和抗氧母粒的密炼的温度独立的为110~130℃;密炼的时间独立的为8~10min。
优选的,在上述一种超薄辐照交联聚乙烯泡棉的制备方法中,所述步骤(3)中电子辐照的剂量为2~7Mrad。
优选的,在上述一种超薄辐照交联聚乙烯泡棉的制备方法中,所述步骤(3)中拉薄的温度为210~230℃;拉薄后的厚度为0.1~0.3mm。
经由上述的技术方案可知,与现有技术相比,本发明具有如下有益效果:
(1)本发明以高密度聚乙烯为主体树脂,提高了片材的强度,还添加少量线性低密度聚乙烯增加韧性,加入成核剂使得制备的泡棉具有泡孔均匀,尺寸稳定性好,易于加工等特性。同时,还增加了热固性酚醛树脂,在熔融挤出以及高温发泡过程中固化,形成高刚性的聚合网络,提高了聚乙烯的刚性,有效防止泡棉拉薄后泡孔变大,尺寸不稳定的问题。乙烯共聚物的使用可以增加聚乙烯与无机组分的相容性,三元乙丙橡胶可改善泡棉的回弹性以及韧性,使泡棉具有良好的力学性能。交联剂与电子辐照起到双重交联作用,提高交联网络的稳定性,而且还可减少电子辐照的剂量。
(2)本发明的聚乙烯泡棉泡孔均匀,尺寸稳定,力学性能较高,厚度可低至0.3mm以下。
具体实施方式
本发明提供一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯60~80份,线性低密度聚乙烯10~25份,乙烯共聚物10~20份,三元乙丙橡胶3~10份,酚醛树脂5~10份,发泡剂3~5份,敏化剂0.5~2份,成核剂0.1~1份,抗氧剂0.5~2份,交联剂0.5~3份。
在本发明中,超薄辐照交联聚乙烯泡棉,优选的,由包含以下质量份数的原料制备而成:高密度聚乙烯62~78份,线性低密度聚乙烯12~21份,乙烯共聚物11~19份,三元乙丙橡胶4~9份,酚醛树脂6~10份,发泡剂3.2~4.9份,敏化剂0.7~1.9份,成核剂0.2~0.8份,抗氧剂0.6~1.8份,交联剂0.8~2.6份;
进一步优选的,由包含以下质量份数的原料制备而成:高密度聚乙烯66~74份,线性低密度聚乙烯15~20份,乙烯共聚物13~17份,三元乙丙橡胶5~8份,酚醛树脂7~9份,发泡剂3.6~4.5份,敏化剂0.9~1.6份,成核剂0.4~0.7份,抗氧剂0.9~1.5份,交联剂1.3~2.3份;
更优选的,由包含以下质量份数的原料制备而成:高密度聚乙烯71份,线性低密度聚乙烯18份,乙烯共聚物15份,三元乙丙橡胶6份,酚醛树脂8份,发泡剂4.2份,敏化剂1.2份,成核剂0.5份,抗氧剂1份,交联剂2份。
在本发明中,乙烯共聚物优选为乙烯-醋酸乙烯酯共聚物和马来酸酐接枝乙烯辛烯共聚物;乙烯-醋酸乙烯酯共聚物和马来酸酐接枝乙烯辛烯共聚物的质量比优选为1~3:2~5,进一步优选为2~3:3~5,更优选为3:5。
在本发明中,酚醛树脂优选为热固性酚醛树脂。
在本发明中,发泡剂优选为偶氮二甲酰胺或4,4’-氧代双苯磺酰肼,进一步优选为偶氮二甲酰胺。
在本发明中,敏化剂优选为氧化锌和硬脂酸钙中的一种或两种,进一步优选为氧化锌。
在本发明中,成核剂优选为滑石粉和碳酸钙中的一种或两种,进一步优选为碳酸钙。
在本发明中,抗氧剂优选为抗氧剂1010。
在本发明中,交联剂优选为三烯丙基异氰酸酯。
本发明还提供一种超薄辐照交联聚乙烯泡棉的制备方法,包括以下步骤:
(1)将线性低密度聚乙烯、乙烯共聚物、发泡剂密炼后造粒,得到发泡母粒;
将高密度聚乙烯、敏化剂、成核剂、抗氧剂、交联剂密炼后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、酚醛树脂熔融挤出,得到片材;
(3)将片材进行电子辐照后进行发泡,然后进行拉薄,得到超薄辐照交联聚乙烯泡棉。
在本发明中,步骤(1)中发泡母粒和抗氧母粒的密炼的温度独立的优选为110~130℃,进一步优选为113~127℃,更优选为125℃;密炼的时间独立的优选为8~10min,进一步优选为10min。
在本发明中,步骤(2)中熔融挤出使用单螺杆挤出机;单螺杆挤出机的工作条件为:一区到七区的温度分别优选为112~120℃、113~121℃、114~122℃、115~123℃、116~124℃、117~125℃、118~126℃,进一步优选为114~119℃、115~120℃、116~120℃、117~121℃、118~122℃、118~124℃、119~124℃,更优选为115℃、116℃、118℃、118℃、119℃、122℃、124℃;连接体温度优选为110~125℃,进一步优选为114~121℃,更优选为117℃;螺杆转速优选为18~20r/min,进一步优选为19r/min。
在本发明中,步骤(3)中电子辐照的剂量优选为2~7Mrad,进一步优选为3~6Mrad,更优选为5Mrad。
在本发明中,步骤(3)中发泡的温度优选为210~240℃,进一步优选为216~234℃,更优选为225℃;发泡的时间优选为1~6min,进一步优选为2~4min,更优选为3min。
在本发明中,步骤(3)中拉薄的温度优选为210~230℃,进一步优选为212~227℃,更优选为223℃;拉薄后的厚度优选为0.1~0.3mm,进一步优选为0.2mm。
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。基于本发明中的实施例,本领域普通技术人员在没有做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
本实施例提供一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯70份,线性低密度聚乙烯15份,乙烯-醋酸乙烯酯共聚物6份,马来酸酐接枝乙烯辛烯共聚物10份,三元乙丙橡胶5份,热固性酚醛树脂6份,偶氮二甲酰胺3份,氧化锌0.5份,滑石粉0.7份,抗氧剂10101份,三烯丙基异氰酸酯3份。
其制备方法包括以下步骤:
(1)将线性低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、马来酸酐接枝乙烯辛烯共聚物、偶氮二甲酰胺于110℃密炼8min后造粒,得到发泡母粒;
将高密度聚乙烯、氧化锌、滑石粉、抗氧剂1010、三烯丙基异氰酸酯密于120℃密炼10min后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、热固性酚醛树脂使用单螺杆挤出机熔融挤出(工作条件为:一区到七区的温度分别为112℃、115℃、114~122℃、117℃、119℃、123℃、124℃,连接体温度为110℃,螺杆转速为18r/min),得到片材;
(3)将片材进行电子辐照(辐照的剂量为4Mrad)后于210℃发泡2min,然后使用拉薄机于210℃拉薄,得到0.2mm厚的超薄辐照交联聚乙烯泡棉。
实施例2
本实施例提供一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯66份,线性低密度聚乙烯20份,乙烯-醋酸乙烯酯共聚物12份,马来酸酐接枝乙烯辛烯共聚物8份,三元乙丙橡胶5份,热固性酚醛树脂8份,偶氮二甲酰胺4份,硬脂酸钙0.5份,滑石粉0.5份,抗氧剂10100.5份,三烯丙基异氰酸酯0.5份。
其制备方法包括以下步骤:
(1)将线性低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、马来酸酐接枝乙烯辛烯共聚物、偶氮二甲酰胺于115℃密炼9min后造粒,得到发泡母粒;
将高密度聚乙烯、硬脂酸钙、滑石粉、抗氧剂1010、三烯丙基异氰酸酯密于120℃密炼8min后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、热固性酚醛树脂使用单螺杆挤出机熔融挤出(工作条件为:一区到七区的温度分别为116℃、118℃、120℃、122℃、124℃、125℃、126℃,连接体温度为120℃,螺杆转速为18r/min),得到片材;
(3)将片材进行电子辐照(辐照的剂量为6Mrad)后于230℃发泡4min,然后使用拉薄机于220℃拉薄,得到0.2mm厚的超薄辐照交联聚乙烯泡棉。
实施例3
本实施例提供一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯60份,线性低密度聚乙烯25份,乙烯-醋酸乙烯酯共聚物5份,马来酸酐接枝乙烯辛烯共聚物5份,三元乙丙橡胶3份,热固性酚醛树脂10份,4,4’-氧代双苯磺酰肼3份,硬脂酸钙2份,碳酸钙0.1份,抗氧剂10100.5份,三烯丙基异氰酸酯3份。
其制备方法包括以下步骤:
(1)将线性低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、马来酸酐接枝乙烯辛烯共聚物、4,4’-氧代双苯磺酰肼于120℃密炼10min后造粒,得到发泡母粒;
将高密度聚乙烯、硬脂酸钙、碳酸钙、抗氧剂1010、三烯丙基异氰酸酯密于110℃密炼8min后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、热固性酚醛树脂使用单螺杆挤出机熔融挤出(工作条件为:一区到七区的温度分别为112℃、115℃、116℃、118℃、119℃、123℃、126℃,连接体温度为125℃,螺杆转速为20r/min),得到片材;
(3)将片材进行电子辐照(辐照的剂量为2Mrad)后于210℃发泡6min,然后使用拉薄机于210℃拉薄,得到0.3mm厚的超薄辐照交联聚乙烯泡棉。
实施例4
本实施例提供一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯75份,线性低密度聚乙烯10份,乙烯-醋酸乙烯酯共聚物6份,马来酸酐接枝乙烯辛烯共聚物9份,三元乙丙橡胶8份,热固性酚醛树脂7份,4,4’-氧代双苯磺酰肼4份,硬脂酸钙1份,碳酸钙0.8份,抗氧剂10102份,三烯丙基异氰酸酯2份。
其制备方法包括以下步骤:
(1)将线性低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、马来酸酐接枝乙烯辛烯共聚物、4,4’-氧代双苯磺酰肼于118℃密炼8min后造粒,得到发泡母粒;
将高密度聚乙烯、硬脂酸钙、碳酸钙、抗氧剂1010、三烯丙基异氰酸酯密于125℃密炼10min后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、热固性酚醛树脂使用单螺杆挤出机熔融挤出(工作条件为:一区到七区的温度分别为112℃、114℃、114~122℃、116℃、118℃、120℃、124℃,连接体温度为112℃,螺杆转速为20r/min),得到片材;
(3)将片材进行电子辐照(辐照的剂量为4Mrad)后于220℃发泡5min,然后使用拉薄机于210℃拉薄,得到0.2mm厚的超薄辐照交联聚乙烯泡棉。
实施例5
本实施例提供一种超薄辐照交联聚乙烯泡棉,由包含以下质量份数的原料制备而成:
高密度聚乙烯80份,线性低密度聚乙烯25份,乙烯-醋酸乙烯酯共聚物10份,马来酸酐接枝乙烯辛烯共聚物10份,三元乙丙橡胶10份,热固性酚醛树脂10份,偶氮二甲酰胺5份,氧化锌2份,滑石粉0.1份,抗氧剂10102份,三烯丙基异氰酸酯3份。
其制备方法包括以下步骤:
(1)将线性低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、马来酸酐接枝乙烯辛烯共聚物、偶氮二甲酰胺于120℃密炼10min后造粒,得到发泡母粒;
将高密度聚乙烯、氧化锌、滑石粉、抗氧剂1010、三烯丙基异氰酸酯密于130℃密炼10min后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、热固性酚醛树脂使用单螺杆挤出机熔融挤出(工作条件为:一区到七区的温度分别为116℃、118℃、120℃、121℃、124℃、125℃、126℃,连接体温度为125℃,螺杆转速为20r/min),得到片材;
(3)将片材进行电子辐照(辐照的剂量为7Mrad)后于240℃发泡6min,然后使用拉薄机于230℃拉薄,得到0.1mm厚的超薄辐照交联聚乙烯泡棉。
对比例1
本对比例提供一种超薄辐照交联聚乙烯泡棉,具体参见实施例1,不同之处在于将高密度聚乙烯替换为相同质量的低密度聚乙烯。
对比例2
本对比例提供一种超薄辐照交联聚乙烯泡棉,具体参见实施例1,不同之处在于不含有三元乙丙橡胶。
对比例3
本对比例提供一种超薄辐照交联聚乙烯泡棉,具体参见实施例1,不同之处在于不含有热固性酚醛树脂。
对比例4
本对比例提供一种超薄辐照交联聚乙烯泡棉,具体参见实施例1,不同之处在于不含有三烯丙基异氰酸酯。
对比例5
本对比例提供一种超薄辐照交联聚乙烯泡棉,具体参见实施例1,不同之处在于不含有马来酸酐接枝乙烯辛烯共聚物。
将实施例1~5和对比例1~5的聚乙烯泡棉进行力学性能测试,结果如表1所示。
表1聚乙烯泡棉的力学性能测试结果
由表1可知,本发明的聚乙烯泡棉的纵向拉伸强度大于12MPa,纵向断裂伸长率大于400%,纵向撕裂强度大于45KN/m,横向拉伸强度大于5MPa,横向断裂伸长率大于300%,横向撕裂强度大于30KN/m,具有良好的力学性能。而根据对比例可知,热固性酚醛树脂对聚乙烯泡棉的性能影响较大,其聚合物网络可以有效提高泡棉的强度,高密度聚乙烯的使用也解决了低密度聚乙烯机械强度差的问题。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (7)
1.一种超薄辐照交联聚乙烯泡棉,其特征在于,由包含以下质量份数的原料制备而成:
高密度聚乙烯60~80份,线性低密度聚乙烯10~25份,乙烯共聚物10~20份,三元乙丙橡胶3~10份,酚醛树脂5~10份,发泡剂3~5份,敏化剂0.5~2份,成核剂0.1~1份,抗氧剂0.5~2份,交联剂0.5~3份;
所述乙烯共聚物为乙烯-醋酸乙烯酯共聚物和马来酸酐接枝乙烯辛烯共聚物;乙烯-醋酸乙烯酯共聚物和马来酸酐接枝乙烯辛烯共聚物的质量比为1~3:2~5;
所述酚醛树脂为热固性酚醛树脂;
所述交联剂为三烯丙基异氰酸酯。
2.根据权利要求1所述的一种超薄辐照交联聚乙烯泡棉,其特征在于,所述敏化剂为氧化锌和硬脂酸钙中的一种或两种。
3.根据权利要求1或2所述的一种超薄辐照交联聚乙烯泡棉,其特征在于,所述成核剂为滑石粉和碳酸钙中的一种或两种。
4.权利要求1~3任一项所述的一种超薄辐照交联聚乙烯泡棉的制备方法,其特征在于,包括以下步骤:
(1)将线性低密度聚乙烯、乙烯共聚物、发泡剂密炼后造粒,得到发泡母粒;
将高密度聚乙烯、敏化剂、成核剂、抗氧剂、交联剂密炼后造粒,得到抗氧母粒;
(2)将发泡母粒、抗氧母粒、三元乙丙橡胶、酚醛树脂熔融挤出,得到片材;
(3)将片材进行电子辐照后进行发泡,然后进行拉薄,得到超薄辐照交联聚乙烯泡棉。
5.根据权利要求4所述的一种超薄辐照交联聚乙烯泡棉的制备方法,其特征在于,所述步骤(1)中发泡母粒和抗氧母粒的密炼的温度独立的为110~130℃;密炼的时间独立的为8~10min。
6.根据权利要求4或5所述的一种超薄辐照交联聚乙烯泡棉的制备方法,其特征在于,所述步骤(3)中电子辐照的剂量为2~7Mrad。
7.根据权利要求6所述的一种超薄辐照交联聚乙烯泡棉的制备方法,其特征在于,所述步骤(3)中拉薄的温度为210~230℃;拉薄后的厚度为0.1~0.3mm。
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