CN115538181A - 一种除尘用高效耐衰退驻极体滤材及其制备方法 - Google Patents
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Abstract
本发明公开一种除尘用高效耐衰退驻极体滤材及其制备方法,包括滤材,滤材的表面上通过高压静电将纺丝及高压静电喷雾的方式形成纳米纤维复合驻极体微粒膜,所述纳米纤维膜包括丝状纤维,以及粘附在所述丝状纤维上的驻极体颗粒,其制备方法是通过高压静电纺丝在滤材的表面形成的纳米纤维膜,再通过高压静电喷雾方式,使纳米纤维膜的纤维上附着纳米级的驻极体颗粒,最后通过电晕处理方式让纳米级的驻极体颗粒附上静电,进一步提高纳米纤维的过滤效率,制造出的纳米纤维复合驻极体滤材过滤效率高,阻力低,而且使用较长时间后,驻极体的静电效应没有明显衰退,显著提高普通静电纺纳米纤维的过滤效率且不受静电衰退的影响。
Description
技术领域
本发明具体涉及一种除尘用高效耐衰退驻极体滤材及其制备方法。
背景技术
驻极体是指在自然条件下,可以长时间贮存空间电荷和极化电荷,在宏观条件下表现出电场极性的材料。目前常用的驻极体高分子聚合物材料主要为聚丙烯(PP)、PTFE(聚四氟乙烯)、FEP(全氟乙烯丙烯共聚物)等。FEP(全氟乙烯丙烯共聚物)具有很高体积电阻率和表面电阻率,极低的吸水率,这表明FEP驻极体具有非常稳定的电荷存储性能。
由于含氟高分子聚合物PTFE及FEP熔融粘度大难于加工且价格高。因此目前我国驻极体滤材的母体绝大部分为聚丙烯(PP),一般应用于空气过滤行业如空调滤芯、口罩等;此技术为在聚丙烯母粒中混入驻极体材料,通过熔喷工艺制作成聚丙烯无纺布后再经过电晕处理成为驻极体滤材。
目前对于滤材基料为无纺布(PET)和木浆纤维滤纸等各种其他材料无法通过上述工艺制成驻极体材料,或者上述工艺制成的驻极体半衰期短,使用较长时间后静电效果大幅下降,无法满足除尘要求。
发明内容
有鉴于此,本发明目的是提供一种除尘用高效耐衰退驻极体滤材,同时还提供对应的制备方法。
为了解决上述技术问题,本发明的技术方案是:
一种除尘用高效耐衰退驻极体滤材,包括滤材基料,滤材基料的表面上通过高压静电将纺丝溶液经过静电纺丝方式形成的纳米纤维膜,后再通过高压静电喷雾的方式将驻极体颗粒粘附在纳米纤维上,所述驻极体颗粒的大小不一致,并且附着的方式也不一致。
进一步的,滤材为聚酯无纺布或木浆纤维滤纸。
一种除尘用高效耐衰退驻极体滤材的制备方法,包括以下具体步骤:
S1、通过静电纺丝处理设备给滤材基料覆上纳米纤维膜,具体步骤为:
S11、调配静电纺丝溶液:把1000g水加热到95摄氏度后,加入100g聚乙烯醇后保持温度搅拌两小时后冷却至室温,加入1g十二烷基硫酸钠及1g氯化钠搅拌均匀制成纺丝溶液,备用;
S12、静电纺丝:通过微量泵将具体步骤11调配好的纺丝溶液输送到纺丝针筒,在纺丝针筒的金属端施加30KV的正极电压,在接收板的接受端施加30KV的负极电压,滤材通过收卷装置匀速在纺丝针筒及接收板中运动,并在滤材表面覆盖一层纳米纤维膜,形成细密纳米级纤维层,备用;
S2、第二步通过静电喷涂设备给滤材附上驻极体颗粒,具体步骤为:
S21、调配静电喷雾乳液:在1000g水中加入100g的聚全氟乙丙烯浓缩水性分散液和1g十二烷基硫酸钠,制成喷雾乳液;
S22、静电喷雾:通过微量泵将喷雾乳液输送到喷雾针筒,在喷雾针筒的金属端施加30KV的正极电压,在接受端施加30KV的负极电压,将步骤1中经过静电纺丝形成纳米纤维膜的滤材通过收卷装置匀速在喷雾针筒及接收板中运动,使纳米纤维膜的丝状纤维上附着纳米级的驻极体颗粒;
S3、第三步电晕处理,具体步骤为:
S31、调整电晕处理装置,使得放电极的金属尖端朝向接收极,并调整放电极与接收极之间距离为300MM,然后将步骤2处理好的滤材铺设在接收极的表面上,纳米纤维膜附着驻极体颗粒的一面朝向放电极;
S31、工作时,给放电极施加正极40KV高压电,接收极施加负极20KV高压电,同时接收极加热到120摄氏度,保证滤材电晕时间≥5分钟,让驻极体颗粒附上静电,进一步提高纳米纤维的过滤效率,制备得到耐衰退驻极体滤材。
进一步的,具体步骤21中的聚全氟乙丙烯浓缩水性分散液固含量≥50%。
本发明技术效果主要体现在以下方面:通过高压静电纺丝在滤材的表面形成的纳米纤维膜,再通过高压静电喷雾方式,使纳米纤维膜的纤维上附着纳米级的驻极体颗粒,最后通过电晕处理方式让纳米级的驻极体颗粒附上静电,进一步提高纳米纤维的过滤效率,制造出的纳米纤维复合驻极体滤材过滤精度高,阻力低,而且使用较长时间后,驻极体的静电效应没有明显衰退,显著提高普通静电纺纳米纤维的过滤效率且不受静电衰退的影响。
附图说明
图1为本发明一种除尘用高效耐衰退驻极体滤材的结构示意图;
图2为图1中纳米纤维膜的电镜图;
图3为图2中纳米纤维膜附着驻极体颗粒的示意图;
图4为S12中静电纺丝的装置图;
图5为S22中静电喷雾的装置图;
图6为图5进行电晕处理的示意图。
具体实施方式
以下结合附图,对本发明的具体实施方式作进一步详述,以使本发明技术方案更易于理解和掌握。
实施例
一种除尘用高效耐衰退驻极体滤材,如图1负极2所示,包括滤材基料1,在滤材基料1的表面上通过高压静电将纺丝液经过纺丝方式形成的纳米纤维膜2。
如图3所示,所述纳米纤维膜2包括丝状纤维21,以及粘附在所述丝状纤维21上的驻极体颗粒22,所述驻极体颗粒22的大小不一致,并且附着的方式也不一致。
在本实施例中,滤材1为聚酯无纺布或木浆纤维滤纸。
一种除尘用高效耐衰退驻极体滤材的制备方法,结合图4负极6,包括以下具体步骤:
S1、通过静电纺丝处理设备给滤材料覆上纳米纤维膜,具体步骤为:
S11、调配静电纺丝溶液:把1000g水加热到95摄氏度后,加入100g聚乙烯醇后保持温度搅拌两小时后冷却至室温,加入1g十二烷基硫酸钠及1g氯化钠搅拌均匀制成纺丝液,备用;
S12、静电纺丝:通过微量泵3将具体步骤11调配好的纺丝液输送到纺丝针筒31,在纺丝针筒31的金属端施加30KV的正极电压,在接收板4的接受端施加30KV的负极电压,滤材1通过收卷装置匀速在纺丝针筒31及接收板4中运动,并在滤材1表面覆盖一层纳米纤维膜,形成细密纳米级纤维层,备用;
S2、第二步通过静电喷雾设备给滤材附上驻极体颗粒,具体步骤为:
S21、调配静电喷雾乳液:在1000g水中加入100g的聚全氟乙丙烯浓缩水性分散液和1g十二烷基硫酸钠,制成喷雾乳液;
S22、静电喷雾:通过微量泵3将喷雾乳液输送到喷雾针筒32,在喷雾针筒32的金属端施加30KV的正极电压,在接收板4的接受端施加30KV的负极电压,将步骤1中经过静电纺丝形成纳米纤维膜的滤材通过收卷装置匀速在喷雾针筒32及接收板4中运动,使纳米纤维膜的丝状纤维上附着纳米级的驻极体颗粒;
S3、第三步电晕处理,具体步骤为:
S31、调整电晕处理装置,使得放电极5的金属尖端朝向接收板6,并调整放电极5与接收板6之间距离为300MM,然后将步骤2处理好的滤材1铺设在接收板6的表面上,纳米纤维膜附着驻极体颗粒的一面朝向放电极5;
S31、工作时,给放电极5施加正极40KV高压电,接收极6施加负极20KV高压电,同时接收板6加热到120摄氏度,保证滤材1电晕时间≥5分钟,让驻极体颗粒附上静电,进一步提高纳米纤维的过滤效率,制备得到耐衰退驻极体滤材。
在本实施例中,具体步骤21中的聚全氟乙丙烯浓缩分散液固含量为
≥50%。
实验例
测试方法,选取七个测试样品,分别为:
样品编号1:现有公知工艺制备的聚丙烯(PP)驻极体滤材;
样品编号2:现有公知工艺制备的聚酯(PET)无纺布滤材;
样品编号3:现有公知工艺制备的木浆纤维滤纸滤材;
样品编号4:现有公知工艺制备的纳米纤维复合聚酯(PET)无纺布滤材;
样品编号5:现有公知工艺制备的纳米纤维复合木浆纤维滤纸滤材;
样品编号6:本发明制备方法制备的纳米纤维正极驻极体复合无纺布(PET)滤材;
样品编号7:本发明制备方法制备的纳米纤维正极驻极体复合木浆纤维滤纸滤材料。
根据(GB/T 6719负极2009)附录A、附录B除尘效率检验,对各样品进行常温下及自然条件下放置一年,过滤效率测试,
测试结果如下:
产品的检测数据、国标、与现有市场上同类型产品的对比数据。
根据上表的数据显示,在同样的条件下,样品编号1中现有公知工艺制备的聚丙烯(PP)驻极体滤材常温下过滤效率及自然条件下放置一年,其过滤效率高且衰退慢,但是这类产一般用于空气中细菌、气溶胶的过滤。而一般应用于除尘系统中的高强度要求过滤驻极体采用非PP材料(聚酯无纺布、木浆纤维滤纸)做成,衰退很快,且过滤效率低,本发明制备的样品编号6产品和样品编号7产品通过采用聚酯无纺布或木浆纤维滤纸结合纺丝液进行静电纺丝、结合喷雾乳液进行静电喷雾使纤维丝附着纳米级驻极体颗粒的工艺,虽然无法与样品编号1的产品对比在空气中细菌、气溶胶的过滤效果,但是在针对其他滤材基料中,本发明制备的样品编号6产品和样品编号7产品的常温下过滤效率或自然条件下放置一年后过滤效率,相比样品编号2负极5的产品,其驻极体的静电效应没有明细衰退,驻极体滤材依旧具备过滤精高和阻力低的优点。
本发明技术效果主要体现在以下方面:通过高压静电纺丝在滤材基料的表面形成的纳米纤维膜,再通过高压静电喷雾方式,使纳米纤维膜的纤维上附着纳米级的驻极体颗粒,最后通过电晕处理方式让纳米级的驻极体颗粒附上静电,进一步提高纳米纤维的过滤效率,制造出的驻极体滤材过滤精高,阻力低,而且使用较长时间后,驻极体的静电效应没有明显衰退,能进一步提高静电纺丝的过滤效率。
当然,以上只是本发明的典型实例,除此之外,本发明还可以有其它多种具体实施方式,凡采用等同替换或等效变换形成的技术方案,均落在本发明要求保护的范围之内。
Claims (4)
1.一种除尘用高效耐衰退驻极体滤材,包括滤材,其特征在于:滤材的表面上通过高压静电将纺丝液经过静电纺丝方式形成的纳米纤维膜,所述纳米纤维膜包括丝状纤维,以及粘附在所述丝状纤维上的驻极体颗粒,所述驻极体颗粒的大小不一致,并且附着的方式也不一致。
2.根据权利要求1所述的一种除尘用高效耐衰退驻极体滤材,其特征在于:滤材基材为聚酯无纺布或木浆纤维滤纸。
3.一种根据权利要求1负极2所述除尘用高效耐衰退驻极体滤材的制备方法,其特征在于,包括以下具体步骤:
S1、通过静电纺丝处理设备给滤材基料覆上纳米纤维膜,具体步骤为:
S11、调配静电纺丝溶液:把1000g水加热到95摄氏度后,加入100g聚乙烯醇后保持温度搅拌两小时后冷却至室温,加入1g十二烷基硫酸钠及1g氯化钠搅拌均匀制成纺丝溶液,备用;
S12、静电纺丝:通过微量泵将具体步骤11调配好的纺丝溶液输送到纺丝针筒,在纺丝针筒的金属端施加30KV的正极电压,在接收板的接受端施加30KV的负极电压,滤材通过收卷装置匀速在纺丝针筒及接收板中运动,并在滤材表面覆盖一层纳米纤维膜,形成细密纤维层,备用;
S2、第二步通过静电喷雾设备给滤材附上驻极体颗粒,具体步骤为:
S21、调配静电喷雾乳液:在1000g水中加入100g的聚全氟乙丙烯浓缩水性分散液和1g十二烷基硫酸钠,制成喷雾乳液;
S22、静电喷雾:通过微量泵将喷雾乳液输送到喷雾针筒,在喷雾针筒的金属端施加30KV的正极电压,在接收板的接受端施加30KV的负极电压,将步骤1中经过静电纺丝形成纳米纤维膜的滤材通过收卷装置匀速在喷雾针筒及接收板中运动,使纳米纤维膜的丝状纤维上附着纳米级的驻极体颗粒;
S3、第三步电晕处理,具体步骤为:
S31、调整电晕处理装置,使得放电极的金属尖端朝向接收板,并调整放电极与接收板之间距离为300MM,然后将步骤2处理好的滤材铺设在接收极的表面上,纳米纤维膜附着驻极体颗粒的一面朝向放电极;
S31、工作时,给放电极施加正极40KV高压电,接收极施加负极20KV高压电,同时接收极加热到120摄氏度,保证滤材电晕时间≥5分钟,让驻极体颗粒附上静电,进一步提高纳米纤维的过滤效率,制备得到耐衰退驻极体滤材。
4.根据权利要求3所述的一种除尘用高效耐衰退驻极体滤材的制备方法,其特征在于:具体步骤21中的聚全氟乙丙烯浓缩水性分散液固含量为50%。
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