CN115058827A - 一种应用于湿度敏感元件的疏水透气膜 - Google Patents
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Abstract
一种应用于湿度敏感元件的疏水透气膜,本发明涉及一种应用于湿度敏感元件的疏水透气膜。本发明是要解决探空气象类传感器穿云表面结露,在多种气候条件下使用湿敏元件特性产生漂移、影响传感器的测量精度的问题。应用于湿度敏感元件的疏水透气膜是采用静电纺丝的方法在湿度敏感元件表面制作高分子纤维膜。本发明适用于用于气象探空等领域。
Description
技术领域
本发明涉及一种应用于湿度敏感元件的疏水透气膜。
背景技术
湿度传感器应用于气象探空等领域时,放飞过程中会经历穿云、雷雨等多种恶劣气候条件,湿度传感器温度也会变化较剧烈。由于湿空气的饱和水蒸气含量与空气温度成正比,当空气温度较低时,空气中存在的少量水蒸气也会在湿敏元件表面产生结露或结霜,堵塞水分交换通道,湿敏元件会部分或全部失去感湿功能;同样雨滴滴落在湿敏元件表面也会形成水膜,使湿度敏感元件失效;在零下的云中还存在着大量的过冷水雾,过冷水一旦与结构物相碰或接触就会发生冻结成冰,使湿度传感器失效。另外探空用湿敏元件要在多种气候条件下使用,工作时湿敏元件必须与环境气氛相接触,空气中的灰尘、有机气氛会导致湿敏元件特性产生漂移,影响传感器的测量精度。
发明内容
本发明是要解决探空气象类传感器穿云表面结露,在多种气候条件下使用湿敏元件特性产生漂移、影响传感器的测量精度的问题,而提供一种应用于湿度敏感元件的疏水透气膜。
本发明一种应用于湿度敏感元件的疏水透气膜是采用静电纺丝的方法在湿度敏感元件表面制作高分子纤维膜。
本发明的有益效果:
本发明采用静电纺丝的方法直接在湿敏电容表面制作了一种疏水透气膜,用于提高湿敏电容的防结露性能;制备的防水透气保护膜由于表面具有微米级的孔径,兼具疏水性和透气性,且较均质膜而言纳米纤维膜微观上更为粗糙,提高了膜层的疏水性能,同时采用静电纺丝法制备高分子纳米纤维膜,膜层具有良好的的透气性和均匀性。
本发明实现了与湿敏元件的一体化制作,有效减小了湿敏元件的体积,为湿度传感器的微型化、集成化提供了技术储备。
本发明制造工艺成熟稳定,可批量化生产;.所述疏水透气膜可拓展应用于各类自清洁物体表面。
附图说明
图1是实施例一覆有高分子静电纺丝膜的湿敏元件的结构示意图;其中1为Si基底、2为上电极、3为下电极、4为感湿膜、5为静电纺丝膜;
图2是实施例一中未覆有高分子静电纺丝膜的湿敏元件的上电极表面纯水接触角测试图;
图3是实施例一中覆有高分子静电纺丝膜的湿敏元件的醋酸纤维素膜表面纯水接触角测试图;
图4是湿度传感器的放飞数据对比曲线;其中1表示实施例一覆有高分子静电纺丝膜的湿敏元件,2表示未覆盖高分子静电纺丝膜的湿敏元件;
图5是SiO2/醋酸纤维素超疏水涂层表面纯水接触角测试图。
具体实施方式
具体实施方式一:本实施方式一种应用于湿度敏感元件的疏水透气膜是采用静电纺丝的方法在湿度敏感元件表面制作高分子纤维膜。
本实施方式在湿敏元件表面制作了高分子疏水透气保护膜,该疏水膜具有微米和纳米复合结构的高分子薄膜表面具有一定的自清洁能力。静电纺丝膜的表面形貌和润湿性能,结露在湿敏元件表面表面形成了一个非常大的接触角,通过空气的流动将水珠吹离湿敏元件表面,起到防结露(霜)的作用,同时水带着表面上的污垢、颗粒以及其他污染物离开表面,起到自清洁的作用。
本实施方式的湿度敏感元件可以是各种原理的湿敏元件,包括湿敏电容、湿敏电阻等。
本实施方式的高分子纤维膜具有纳米级微观结构,具有低的表面能,由良好的疏水和自清洁能力。
具体实施方式二:本实施方式与具体实施方式一不同的是:静电纺丝中静电纺丝溶液为混合溶剂体系,主溶剂与助溶剂的比例为10:1。其它与具体实施方式一相同。
具体实施方式三:本实施方式与具体实施方式一或二不同的是:静电纺丝溶液中高分子材料的固含量为1~20%。其它与具体实施方式一或二相同。
具体实施方式四:本实施方式与具体实施方式一至三之一不同的是:所述高分子材料为醋酸纤维素或聚酰亚胺。其它与具体实施方式一至三之一相同。
具体实施方式五:本实施方式与具体实施方式一至四之一不同的是:所述主溶剂为芳香类、脂肪烃类、卤化烃类或脂类。其它与具体实施方式一至四之一相同。
具体实施方式六:本实施方式与具体实施方式一至五之一不同的是:所述助溶剂为醇类、醚类或酮类。其它与具体实施方式一至五之一相同。
本实施方式中所选助溶剂要与主溶剂具有良好的互溶性。
具体实施方式七:本实施方式与具体实施方式一至六之一不同的是:静电纺丝的工艺参数:工作电压为10~15kV,接收距离为15~20cm,纺丝速率为1~2mL/h。其它与具体实施方式一至六之一相同。
具体实施方式八:本实施方式与具体实施方式一至七之一不同的是:静电纺丝溶液中添加纳米材料,纳米材料的添加量为0.1~0.5mg/mL。其它与具体实施方式一至七之一相同。
本实施方式能进一步增强膜层疏水性能。
具体实施方式九:本实施方式与具体实施方式一至八之一不同的是:所述纳米材料为纳米SiO2或纳米TiO2。其它与具体实施方式一至八之一相同。
具体实施方式十:本实施方式与具体实施方式一至九之一不同的是:应用于湿度敏感元件的疏水透气膜的制备方法按以下步骤进行:
一、将高分子材料溶于有机溶剂中,制得纺丝溶液;有机溶剂由主溶剂和助溶剂混合得到;
二、采用稀硝酸调节纺丝溶液的pH至3~7,然后将纺丝溶液加入纺丝装置内,在湿度敏感元件表面静电纺丝制作纤维膜,获得覆有前驱体纤维膜的湿敏元件;
三、将覆有前驱体纤维膜的湿敏元件置于烘箱内进行固化处理,得到覆有高分子静电纺丝膜的湿敏元件;固化处理采用程序升温,固化温度为60~300℃,固化时间为10~60min;高分子静电纺丝膜的厚度为0.05~0.5μm,高分子静电纺丝膜的纤维直径为200~500nm。其它与具体实施方式一至九之一相同。
通过以下实施例验证本发明的有益效果:
实施例一:一种应用于湿度敏感元件的疏水透气膜的制备方法按以下步骤进行:
一、将醋酸纤维素溶于三氯甲烷、甲醇混合溶剂中,制得纺丝溶液;三氯甲烷与甲醇比例10:1;纺丝溶液中高分子材料的固含量为10%;
二、采用稀硝酸调节纺丝溶液的pH至3~7,然后将纺丝溶液加入纺丝装置内,在湿度敏感元件表面静电纺丝制作纤维膜,获得覆有前驱体纤维膜的湿敏元件;静电纺丝的工艺参数:工作电压为10~15kV,接收距离为15~20cm,纺丝速率为1~2mL/h;
三、将覆有前驱体纤维膜的湿敏元件置于烘箱内进行固化处理,得到覆有高分子静电纺丝膜的湿敏元件;固化处理采用程序升温,固化温度为60~150℃,固化时间为40min;高分子静电纺丝膜的厚度为0.05~0.5μm,高分子静电纺丝膜的纤维直径为200~500nm。
图2是实施例一中未覆有高分子静电纺丝膜的湿敏元件的上电极表面纯水接触角测试图;
图3是实施例一中覆有高分子静电纺丝膜的湿敏元件的醋酸纤维素膜表面纯水接触角测试图;上电极表面接触角为104°CAB膜表面接触角为126°;图4是湿度传感器的放飞数据对比曲线;其中1表示实施例一覆有高分子静电纺丝膜的湿敏元件,2表示未覆盖高分子静电纺丝膜的湿敏元件;有防护膜的湿敏元件在经历高湿之后恢复能力,元件灵敏度明显提升。
实施例二:一种应用于湿度敏感元件的疏水透气膜的制备方法按以下步骤进行:
一、将聚酰亚胺溶于DMF、甲醇混合溶剂中,制得纺丝溶液;DMF与甲醇比例10:1;纺丝溶液中高分子材料的固含量为10%;
二、采用稀硝酸调节纺丝溶液的pH至3~7,然后将纺丝溶液加入纺丝装置内,在湿度敏感元件表面静电纺丝制作纤维膜,获得覆有前驱体纤维膜的湿敏元件;静电纺丝的工艺参数:工作电压为10~15kV,接收距离为15~20cm,纺丝速率为1~2mL/h;
三、将覆有前驱体纤维膜的湿敏元件置于烘箱内进行固化处理,得到覆有高分子静电纺丝膜的湿敏元件;固化处理采用程序升温,固化温度为100~300℃,固化时间为40min。
本实施例在电容型湿敏元件表面制作聚酰亚胺疏水透气膜。聚酰亚胺本身为湿敏材料,具有一定的吸湿特性,本专利采用聚酰亚胺具有较大的疏水基团,尽量降低了聚酰亚胺的吸湿性能,同时柔性的链段可溶于有机溶剂,结构式如下:
实施例三:本实施例与实施例一的不同之处在于:步骤二向溶剂中添加纳米SiO2,采用稀硝酸和氨水调节溶液pH至中性,然后将纺丝溶液加入纺丝装置内;其他与实施例一相同。
图5是SiO2/醋酸纤维素超疏水涂层表面纯水接触角测试图,由图中可以看出,接触角为140°。
Claims (10)
1.一种应用于湿度敏感元件的疏水透气膜,其特征在于应用于湿度敏感元件的疏水透气膜是采用静电纺丝的方法在湿度敏感元件表面制作高分子纤维膜。
2.根据权利要求1所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于静电纺丝中静电纺丝溶液为混合溶剂体系,主溶剂与助溶剂的比例为10:1。
3.根据权利要求2所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于静电纺丝溶液中高分子材料的固含量为1~20%。
4.根据权利要求3所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于所述高分子材料为醋酸纤维素或聚酰亚胺。
5.根据权利要求2所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于所述主溶剂为芳香类、脂肪烃类、卤化烃类或脂类。
6.根据权利要求2所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于其特征在于所述助溶剂为醇类、醚类或酮类。
7.根据权利要求1所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于静电纺丝的工艺参数:工作电压为10~15kV,接收距离为15~20cm,纺丝速率为1~2mL/h。
8.根据权利要求2所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于静电纺丝溶液中添加纳米材料,纳米材料的添加量为0.1~0.5mg/mL。
9.根据权利要求8所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于所述纳米材料为纳米SiO2或纳米TiO2。
10.根据权利要求1所述的一种应用于湿度敏感元件的疏水透气膜,其特征在于应用于湿度敏感元件的疏水透气膜的制备方法按以下步骤进行:
一、将高分子材料溶于有机溶剂中,制得纺丝溶液;有机溶剂由主溶剂和助溶剂混合得到;
二、采用稀硝酸调节纺丝溶液的pH至3~7,然后将纺丝溶液加入纺丝装置内,在湿度敏感元件表面静电纺丝制作纤维膜,获得覆有前驱体纤维膜的湿敏元件;
三、将覆有前驱体纤维膜的湿敏元件置于烘箱内进行固化处理,得到覆有高分子静电纺丝膜的湿敏元件;固化处理采用程序升温,固化温度为60~300℃,固化时间为10~60min;高分子静电纺丝膜的厚度为0.05~0.5μm,高分子静电纺丝膜的纤维直径为200~500nm。
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