CN113354909B - 一种发泡门封及其制备方法 - Google Patents
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Abstract
本发明公开了一种发泡门封及其制备方法,包括以下组分:PVC树脂粉80‑100份、增塑剂50‑70份、发泡剂20‑30份、填充剂20‑50份、润滑剂0.2‑0.5份、稳定剂2‑5份、抗氧剂0.2‑0.5份、抗菌防霉剂1‑2份,发泡剂为改性石墨烯气凝胶粉末。本申请以改性石墨烯气凝胶为发泡剂,对PVC树脂进行发泡,改性石墨烯气凝胶不仅是本方案中的发泡剂,而且由二维片层状的改性石墨烯搭接而成的三维交联网络骨架结构具有超弹性,因此解决了传统发泡剂和二氧化硅气凝胶均不能解决的发泡门封抗压能力差,气泡容易破碎的问题。
Description
技术领域
本发明属于发泡门封技术领域,涉及改性石墨烯气凝胶发泡门封及其制备方法
技术背景
随着全球能源的消耗及人们低碳节能意识的提高,各国相继对冰箱等家电设备提出了更高的能耗标准要求。如欧盟ERP指令、中国最新能耗等级的修订、欧盟市场A+++能耗等级的推广实施等。
在影响冰箱能耗的诸多因素中门封是关键因素之一,为提高门封的密封隔热性能、降低冰箱耗电量,使其达到更高的能效要求,通常可通过调整门封结构特性、改善升级原材料配方等方法来实现。
现有不发泡的门封条热导率通常为0.25W/(m·K),为了寻求更低的热导系数,市场出现了发泡门封,常规泡沫塑料的泡孔直径一般大于50mm,泡孔的密度(单位体积内泡孔的数量)小于106个/cm3。常规发泡门封由于泡孔直径较大,这些大尺寸的泡孔受力时常常成为初始裂纹的发源地,降低了材料的机械性能。
发明内容
本发明的目的是供一种发泡门封及其制备方法,本申请以改性石墨烯气凝胶为发泡剂,对PVC树脂进行发泡,改性石墨烯气凝胶不仅是本方案中的发泡剂,而且由二维片层状的改性石墨烯搭接而成的三维交联网络骨架结构具有超弹性,因此解决了传统发泡剂和二氧化硅气凝胶均不能解决的发泡门封抗压能力差,气泡容易破碎的问题。为了实现上述目的,本发明提供如下技术方案:
一种发泡门封,按照重量份数,包括以下组分:
所述发泡剂为改性石墨烯气凝胶粉末。
优选地,所述增塑剂为聚酯或TOTM增塑剂。
优选地,所述填充剂为碳酸钙、滑石粉、硫酸钡中的一种或几种。
优选地,所述润滑剂为费托蜡、聚乙烯蜡、油酸酰胺中的一种或两种。
优选地,所述稳定剂为钙/锌复合稳定剂、有机锡稳定剂、沸石类铝镁稳定剂中的一种或多种。
优选地,所述PVC树脂粉的聚合度≥1300。
另外,本申请还提供一种制备如上述的发泡门封的方法,包括以下步骤:
将PVC树脂粉和增塑剂按照配方用量称量,将混合均匀的PVC树脂粉和增塑剂加入高速搅拌机250-350r/min搅拌30min,升温至90℃,然后加入发泡剂、填充剂、稳定剂、抗氧剂、防霉抗菌剂和润滑剂,450-550r/min搅拌,继续升温至125℃,均匀后放入冷搅锅降温60-70℃;将上述PVC料加入挤出机挤出造粒,得到PVC微孔结构母粒,挤出成型,得到门封条。
优选地,所述挤出成型是指将PVC微孔结构母粒送入挤出机中挤出成型,对挤出机中十一个区与机头进行控温,挤出机中一区温度为100-110℃,二区至八区温度为115-125℃,九区至十一区温度为105-115℃,机头温度为100-120℃。
优选地,所述挤出机为双螺杆挤出机,转速150-170r/min。
优选地,所述挤出机为单螺杆挤出机,转速20-30r/min。
本发明的有益效果:
1、改性后的具有微孔结构的PVC发泡门封,热导率明显下降,是常规PVC的70%,提高了门封的隔热保温效果,而且可降低门封比重,减少生产成本。
2、PVC门封中加入改性石墨烯气凝胶后,冰箱的降温速度加快10%,停止运行后的升温速度比正常PVC的慢5%,整机能耗降低3%。
3、改性石墨烯气凝胶的表面能很高,能够对增塑剂产生吸附作用,从而降低增塑剂迁移,进而降低因增塑剂迁移产生的制冷设备难开门以及污染食品、有害健康的风险。
4、改性石墨烯气凝胶既可以起到发泡的作用,而且可替代部分填充剂,起到事半功倍的效果。
附图说明
图1是本申请实施例3制备得到的发泡门封显微镜照片。
图2是本申请对照组1制备得到的发泡门封显微镜照片。
具体实施方式
实施例1
一种发泡门封,按照重量份数,包括以下组分:
发泡剂为改性石墨烯气凝胶粉末,具体为氧化石墨烯气凝胶,粒径为20μm。增塑剂为聚酯增塑剂。填充剂为碳酸钙。润滑剂为费托蜡。稳定剂为钙/锌复合稳定剂。
PVC树脂粉的聚合度≥1300。
一种制备如上述的发泡门封的方法,包括以下步骤:
将PVC树脂粉和增塑剂按照配方用量称量,将混合均匀的PVC树脂粉和增塑剂加入高速搅拌机350r/min搅拌30min,升温至90℃,然后加入发泡剂、填充剂、稳定剂、抗氧剂、防霉抗菌剂和润滑剂,550r/min搅拌,继续升温至125℃,均匀后放入冷搅锅降温70℃;将上述PVC料加入挤出机挤出造粒,得到PVC微孔结构母粒,挤出成型,得到门封条。
所述挤出成型是指将PVC微孔结构母粒送入挤出机中挤出成型,对挤出机中十一个区与机头进行控温,挤出机中一区温度为100℃,二区至八区温度为115℃,九区至十一区温度为105℃,机头温度为100℃。挤出机为双螺杆挤出机,转速150r/min。
实施例2
一种发泡门封,按照重量份数,包括以下组分:
发泡剂为改性石墨烯气凝胶粉末,具体为N杂化石墨烯气凝胶,粒径为20μm。增塑剂为TOTM增塑剂。填充剂为碳酸钙和硫酸钡。润滑剂为费托蜡和聚乙烯蜡。稳定剂为钙/锌复合稳定剂和有机锡稳定剂。
PVC树脂粉的聚合度≥1300。
一种制备如上述的发泡门封的方法,包括以下步骤:
将PVC树脂粉和增塑剂按照配方用量称量,将混合均匀的PVC树脂粉和增塑剂加入高速搅拌机250r/min搅拌30min,升温至90℃,然后加入发泡剂、填充剂、稳定剂、抗氧剂、防霉抗菌剂和润滑剂,450r/min搅拌,继续升温至125℃,均匀后放入冷搅锅降温60℃;将上述PVC料加入挤出机挤出造粒,得到PVC微孔结构母粒,挤出成型,得到门封条。
所述挤出成型是指将PVC微孔结构母粒送入挤出机中挤出成型,对挤出机中十一个区与机头进行控温,挤出机中一区温度为110℃,二区至八区温度为125℃,九区至十一区温度为115℃,机头温度为120℃。挤出机为单螺杆挤出机,转速20r/min。
实施例3
一种发泡门封,按照重量份数,包括以下组分:
发泡剂为改性石墨烯气凝胶粉末,具体为硫化石墨烯气凝胶,粒径为20μm。增塑剂为聚酯增塑剂和TOTM增塑剂。填充剂为滑石粉。润滑剂为油酸酰胺。稳定剂为沸石类铝镁稳定剂和有机锡稳定剂。
PVC树脂粉的聚合度≥1300。
一种制备如上述的发泡门封的方法,包括以下步骤:
将PVC树脂粉和增塑剂按照配方用量称量,将混合均匀的PVC树脂粉和增塑剂加入高速搅拌机330r/min搅拌30min,升温至90℃,然后加入发泡剂、填充剂、稳定剂、抗氧剂、防霉抗菌剂和润滑剂,500r/min搅拌,继续升温至125℃,均匀后放入冷搅锅降温65℃;将上述PVC料加入挤出机挤出造粒,得到PVC微孔结构母粒,挤出成型,得到门封条。
所述挤出成型是指将PVC微孔结构母粒送入挤出机中挤出成型,对挤出机中十一个区与机头进行控温,挤出机中一区温度为105℃,二区至八区温度为120℃,九区至十一区温度为110℃,机头温度为110℃。双螺杆挤出机,转速160r/min。
对照组1:
对照组发泡剂采用二氧化硅气凝胶,按照重量份数,包括以下组分:
其他实验条件与实施例3相同。
对实施例1、实施例2、实施例3和对照组1制备的发泡门封的热导率和机械性能等进行检测,检测结果如下表1:
表1
通过上述测试可以看出,本申请实施例的门封条无论拉伸强度还是撕裂强度都明显优于对照组,这是因为改性石墨烯气凝胶发泡均匀,不容易出现应力集中点,在受到压缩应力后,具有较好的弹性。同时石墨烯气凝胶具有更低的导热系数,因而门封具有更低的传热速率,同时PVC门封中加入改性石墨烯气凝胶后,冰箱的降温速度加快10%,停止运行后的升温速度比正常PVC的慢5%,整机能耗降低3%。
从图1和图2可以看出,本实施例3使用改性石墨烯发泡后,泡孔大小适中,分布也较为均匀,表面光滑,破裂极少;而使用二氧化硅气凝胶发泡后,泡孔连成一片,大小不均,互相重叠,泡孔破裂较多。泡孔破裂是导致其力学性能和导热系数下降的主要原因。
此外,应当理解,虽然本说明书按照实施方式加以描述,但并非每个实施方式仅包含一个独立的技术方案,说明书的这种叙述方式仅仅是为清楚起见,本领域技术人员应当将说明书作为一个整体,各实施例中的技术方案也可以经适当组合,形成本领域技术人员可以理解的其他实施方式。
Claims (7)
1.一种发泡门封,其特征在于,按照重量份数,由以下组分构成:
PVC树脂粉80-100份,增塑剂50-70份,发泡剂10-20份,填充剂20-50份,润滑剂0.2-0.5份,稳定剂2-5份,抗氧剂0.2-0.5份,抗菌防霉剂1-2份;
所述发泡剂为改性石墨烯气凝胶粉末,改性石墨烯气凝胶是由二维片层状的改性石墨烯搭接而成的三维交联网络骨架结构;所述改性石墨烯气凝胶为氧化石墨烯气凝胶、N杂化石墨烯气凝胶、硫化石墨烯气凝胶中的一种;所述填充剂为碳酸钙、滑石粉、硫酸钡中的一种或几种,所述润滑剂为费托蜡、聚乙烯蜡、油酸酰胺中的一种或两种,所述稳定剂为钙/锌复合稳定剂、有机锡稳定剂、沸石类铝镁稳定剂中的一种或多种。
2.根据权利要求1所述的发泡门封,其特征在于,所述增塑剂为聚酯或TOTM增塑剂。
3.根据权利要求1所述的发泡门封,其特征在于,所述PVC树脂粉的聚合度≥1300。
4.一种制备如权利要求1-3任一所述的发泡门封的方法,其特征在于,包括以下步骤:
将PVC树脂粉和增塑剂按照配方用量称量,将混合均匀的PVC树脂粉和增塑剂加入高速搅拌机250-350 r/min搅拌30 min,升温至90℃,然后加入发泡剂、填充剂、稳定剂、抗氧剂、防霉抗菌剂和润滑剂,450-550 r/min搅拌,继续升温至125℃,均匀后放入冷搅锅降温60-70℃;将上述PVC料加入挤出机挤出造粒,得到PVC微孔结构母粒,挤出成型,得到门封条。
5.根据权利要求4所述的发泡门封的制备方法,其特征在于,所述挤出成型是指将PVC微孔结构母粒送入挤出机中挤出成型,对挤出机中十一个区与机头进行控温,挤出机中一区温度为100-110℃,二区至八区温度为115-125℃,九区至十一区温度为105-115℃,机头温度为100-120℃。
6.根据权利要求4所述的发泡门封的制备方法,其特征在于,所述挤出机为双螺杆挤出机,转速150-170 r/min。
7.根据权利要求4所述的发泡门封的制备方法,其特征在于,所述挤出机为单螺杆挤出机,转速20-30 r/min。
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