CN114479563A - 一种生物可降解电磁屏蔽涂料及其制备方法 - Google Patents
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Abstract
一种生物可降解电磁屏蔽涂料及其制备方法,包括的原料为重量占比为25‑50%的有效成分,以及重量占比为50‑75%的低分子溶剂,所述有效成分以重量份数计包括天然生物基高分子50‑95份、导电填料3‑50份和辅助分散剂0.5‑2份;其中,该制备方法包括以下步骤:将天然生物基高分子和导电填料加入低分子溶剂,搅拌混匀,得到混合溶液;将辅助分散剂加入混合溶液,继续搅拌,搅拌时间为0.5‑2h,抽真空除去气泡;将抽真空处理后的混合溶液在100‑120℃下加热挥发低分子溶剂,浓缩至固含量达到15‑25%,制备得到电磁屏蔽涂料。本发明的制备方法简单、快捷,原料易得,工艺流程简短,易于操作;且制备得到的电磁屏蔽涂料,保持有天然生物基材料的可降解特性的同时,还具有良好的电磁屏蔽效能。
Description
技术领域
本发明涉及高分子材料领域,具体涉及一种生物可降解电磁屏蔽涂料及其制备方法。
背景技术
高分子工业的发展给人们带来生活便利的同时,也给自然环境带来了严重的危害。这主要是由于石化工业制备的绝大多数高分子不可以生物降解,使用后随意丢弃导致。为了保护我们的生存环境,生物可降解高分子材料是一种很好的替代材料。另外,随着电子器件的大量使用,电磁辐射污染也日益严峻。电磁辐射不仅对电子信号产生干扰,而且对人体健康也构成严重威胁;因此,发展和开发电磁屏蔽材料已是迫在眉睫。
电磁防护涂层技术是目前使用较为广泛的技术,金属材料涂层由于其良好的电磁波反射性能成为一种传统电磁屏蔽材料涂层。然而,金属材料由于密度大、成本高、不耐腐蚀,柔韧性差等缺点限制了其应用发展,特别是在可穿戴人体防护领域,而导电高分子复合涂层材料具有优异的成型加工性、低成本、低密度、耐腐蚀等优势,因此其有望替代传统的金属电磁屏蔽涂层材料。然而,目前所用的导电高分子复合涂层材料基本为不可降解高分子材料,使用后直接丢弃环境从而造成严重的环境危害。
发明内容
为了解决现有技术存在的上述技术问题,本发明提供了一种生物可降解电磁屏蔽涂料及其制备方法,以达到电磁屏蔽的同时,赋予其可生物降解特性的目的。
为实现上述目的,本发明提供了一种生物可降解电磁屏蔽涂料的制备方法,其包括的原料为重量占比为25-50%的有效成分,以及重量占比为50-75%的低分子溶剂,所述有效成分以重量份数计包括天然生物基高分子50-95份、导电填料3-50份和辅助分散剂0.5-2份;其中,
采用上述原料制备生物可降解电磁屏蔽涂料的方法包括以下步骤:
1)将天然生物基高分子和导电填料加入低分子溶剂,搅拌混匀,得到混合溶液;
2)将辅助分散剂加入混合溶液,继续搅拌,搅拌时间为0.5-2h,抽真空除去气泡;
3)将抽真空处理后的混合溶液在100-120℃下加热挥发低分子溶剂,浓缩至固含量达到15-25%,制备得到生物可降解电磁屏蔽涂料。
作为本发明的进一步优选技术方案,所述天然生物基高分子为淀粉、纤维素、乙基纤维素、甲壳素、海藻酸、木质素中的一种或几种。
作为本发明的进一步优选技术方案,所述导电填料为石墨、氧化石墨烯、还原氧化石墨烯、碳纳米管、Mxene中的一种或几种。
作为本发明的进一步优选技术方案,所述辅助添加剂为氢氧化钠稀溶液、氯化钠溶液、氯化钾溶液、氨水中的一种或几种。
作为本发明的进一步优选技术方案,所述低分子溶剂为去离子水和乙醇中的一种或两种。
作为本发明的进一步优选技术方案,所述步骤2)中采用机械搅拌设备以转速360-720rpm进行搅拌。
作为本发明的进一步优选技术方案,所述天然生物基高分子材料与导电填料的重量比为1:0.05-2。
根据本发明的另一方面,本发明还提供了一种生物可降解电磁屏蔽涂料,所述生物可降解电磁屏蔽涂料由上述任一项所述的生物可降解电磁屏蔽涂料的制备方法制备得到。
本发明的生物可降解电磁屏蔽涂料及其制备方法,通过采用上述技术方案,可以达到如下有益效果:
1)本发明制备得到的电磁屏蔽涂料,保持有天然生物基材料的可降解特性的同时,还具有良好的电磁屏蔽效能;
2)本发明制备得到的电磁屏蔽涂料,在具有可生物降解特性的包装、储存、防护等领域具有广阔的应用前景;
3)本发明的制备方法简单、快捷,原料易得,工艺流程简短,易于操作。
附图说明
下面结合附图和具体实施方式对本发明作进一步详细的说明。
图1为本发明实施例1中制备的电磁屏蔽涂料的制备工艺流程图;
图2为本发明实施例1中制备的电磁屏蔽涂料浆料与未添加导电填料制备的可生物降解浆料的宏观对比图;
图3为本发明实施例1中所制备的电磁屏蔽涂料涂覆后的包装盒与未进行涂层的包装盒外观对比图;
图4为本发明实施例1中所制备的电磁屏蔽涂料涂覆后的包装盒与未进行涂层的包装盒厚度的对比图;
图5为本发明实施例1中所制备电磁屏蔽涂料中的石墨填料剥离和分散情况;
图6为本发明实施例1中制得的电磁屏蔽涂料不同厚度条件下的电磁屏蔽效能对比图;
图7为本发明实施例2中所提供的电磁屏蔽涂料涂层与本发明实施例1中所提供的电磁屏蔽涂料涂层的表面接触角对比图。
本发明目的实现、功能特点及优点将结合实施例,参照附图做进一步说明。
具体实施方式
下面将结合附图以及具体实施方式,对本发明做进一步描述。较佳实施例中所引用的如“上”、“下”、“左”、“右”、“中间”及“一”等用语,仅为便于叙述的明了,而非用以限定本发明可实施的范围,其相对关系的改变或调整,在无实质变更技术内容下,当亦视为本发明可实施的范畴。
实施例1
称取49.5 kg 淀粉和49.5 kg石墨加入1000 L去离子水通过机械搅拌混匀,然后加入1L氨水,通过机械搅拌设备以360-720rpm转速搅拌60min,待混匀后加热,在110 ℃下挥发水浓缩至固含量达到20%,得到生物可降解电磁屏蔽涂料,又可称作电磁屏蔽涂层浆料,该电磁屏蔽涂层浆料涂覆后可形成具有电磁屏蔽功能的涂层,其制备工艺流程参阅图1所示。
参阅图2所示,将实施例1制备的电磁屏蔽涂层浆料与传统工艺通过未添加导电填料制备的可生物降解浆料进行宏观形貌对比,图中(a)和(b)为未添加导电填料的可生物降解浆料,(c)和(d)为具有可生物降解特性的电磁屏蔽涂层浆料。对比分析可知,本发明的电磁屏蔽涂层浆料中的导电填料分散均匀,相比未添加导电填料制备的可生物降解浆料,具备更好的粘稠度,而且,因导电填料所具备的导热性能还能加快涂层浆料表面干燥的速度。
参阅图3所示,将实施例1制备的电磁屏蔽涂层浆料涂覆于包装盒上,图中(a)为涂层后的包装盒,(b)为未进行涂层的包装盒,将两者的外观进行对比,可以看出,本发明的电磁屏蔽涂料涂层在包装盒上具有很好的表面涂覆特性。
参阅图4所示,分别对包装盒涂覆实施例1的电磁屏蔽涂层浆料前后的厚度变化进行对比测试,涂覆前后的厚度分别为7.02mm、7.56mm,表明涂层厚度较薄。对涂覆前后的包装盒进行电磁屏蔽测试,结果表明,经过涂覆后的包装盒被赋予优异的电磁屏蔽特性,而且涂层能够在很薄的厚度下赋予被涂覆材料优异的电磁屏蔽效能。
参阅图5所示,图中(a)、(b)、(c)分别为3000,5000,10000倍扫描电镜下观察到通过辅助添加剂剥离分散的石墨片层微观图,可以看出在辅助添加剂的作用下能够抵消一部分石墨片层本身的π-π相互作用从而拓宽石墨层间的距离,达到一个进一步分散剥离的作用。
取不同厚度的快递包装纸盒分别涂覆实施例1的电磁屏蔽涂层浆料,分别进行电磁屏蔽测试,结果参阅图6所示,具体为:对于0.5 mm厚度纸板双面涂覆电磁屏蔽涂料后,其屏蔽值最高可达26 dB;对于1.0 mm厚度纸板双面涂覆电磁屏蔽涂料后,其屏蔽值最高可达32 dB;对于2.0 mm厚度纸板双面涂覆电磁屏蔽涂料后,其屏蔽值最高可达56 dB,参阅图5所示。由此可知,采用本发明的电磁屏蔽涂层浆料,在很薄的厚度下就能够达到很好的电磁屏蔽效能。
实施例2~6
实施例2~6分别采用了与实施例1相同的制备方法,不同之处仅在于所用原料、原料的用量及部分工艺参数的不同,且仅实施例2采用的低分子溶剂为乙醇,其余均为去离子水,具体见表1。以下为了便于说明,将实施例1~6制备得到的电磁屏蔽涂料样品分别记作X1~X6。
表1. 电磁屏蔽涂料的制备工艺参数一览表
对实施例1~5所制备的电磁屏蔽涂料中导电填料的分散情况分别按图5所示方法进行检测,结构表明,所有实施例中的导电填料均分散均匀,且排列为无规排列,呈各向同性,因此,本发明的电磁屏蔽涂料具有普通涂层材料所具备的特性。
本发明以氢氧化钠稀溶液、氯化钠溶液、氯化钾溶液、氨水等作为辅助添加剂,一方面改善了导电填料在电磁屏蔽涂料内部的分散,使导电填料分散分布均匀,且稳定不沉降;另一方面,有利于天然生物基高分子及低分子溶剂进入填料之间,阻止导电填料粒子团聚,对片层填料粒子(如石墨等)具有一定的剥离效果。良好的分散和剥离增加了涂层的电导率,使得其大大提升了电磁屏蔽性能的同时还保持有可生物降解特性。
对实施例1~6所制备的电磁屏蔽涂料X1-X6分别涂覆于样品纸盒上,然后对样品纸盒的电磁屏蔽效果进行测试,结果如表2所示。
表2. 各类电磁屏蔽涂料的电磁屏蔽数据(X波段)
由表2可以看出,本发明的电磁屏蔽涂料涂覆后形成的涂层均具有优异的电磁屏蔽效能,尤其以实施例6的效果最佳,实施例6的基材为乙基纤维素,相对于实施例1,其具有更好的疏水隔热性能,能够在更加极端复杂的环境中使用。
实施例1及实施例3-6中电磁屏蔽涂料制备选择低分子溶剂为去离子水,实施例2中电磁屏蔽涂料制备选择低分子溶剂为乙醇,将实施例1的电磁屏蔽涂料涂层与实施例2的电磁屏蔽涂料涂层,通过接触角测量仪滴加100μL蒸馏水得到表面接触角进行对比,参阅图7对比可知,实施例2制备的电磁屏蔽涂料可以应用于更多复杂的环境,并且保持效能时间更长。
虽然以上描述了本发明的具体实施方式,但是本领域熟练技术人员应当理解,这些仅是举例说明,可以对本实施方式做出多种变更或修改,而不背离本发明的原理和实质,本发明的保护范围仅由所附权利要求书限定。
Claims (8)
1.一种生物可降解电磁屏蔽涂料的制备方法,其特征在于,包括的原料为重量占比为25-50%的有效成分,以及重量占比为50-75%的低分子溶剂,所述有效成分以重量份数计包括天然生物基高分子50-95份、导电填料3-50份和辅助分散剂0.5-2份;其中,
采用上述原料制备生物可降解电磁屏蔽涂料的方法包括以下步骤:
1)将天然生物基高分子和导电填料加入低分子溶剂,搅拌混匀,得到混合溶液;
2)将辅助分散剂加入混合溶液,继续搅拌,搅拌时间为0.5-2h,抽真空除去气泡;
3)将抽真空处理后的混合溶液在100-120℃下加热挥发低分子溶剂,浓缩至固含量达到15-25%,制备得到生物可降解电磁屏蔽涂料。
2.根据权利要求1所述的生物可降解电磁屏蔽涂料的制备方法,其特征在于,所述天然生物基高分子为淀粉、纤维素、乙基纤维素、甲壳素、海藻酸、木质素中的一种或几种。
3.根据权利要求1所述的生物可降解电磁屏蔽涂料的制备方法,其特征在于,所述导电填料为石墨、氧化石墨烯、还原氧化石墨烯、碳纳米管、Mxene中的一种或几种。
4.根据权利要求1所述的生物可降解电磁屏蔽涂料的制备方法,其特征在于,所述辅助添加剂为氢氧化钠稀溶液、氯化钠溶液、氯化钾溶液、氨水中的一种或几种。
5.根据权利要求1所述的生物可降解电磁屏蔽涂料的制备方法,其特征在于,所述低分子溶剂为去离子水和乙醇中的一种或两种。
6.根据权利要求1所述的生物可降解电磁屏蔽涂料的制备方法,其特征在于,所述步骤2)中采用机械搅拌设备以转速360-720rpm进行搅拌。
7.根据权利要求1-6任一所述的生物可降解电磁屏蔽涂料的制备方法,其特征在于,所述天然生物基高分子材料与导电填料的重量比为1:0.05-2。
8.一种生物可降解电磁屏蔽涂料,其特征在于,所述生物可降解电磁屏蔽涂料由权利要求1-7任一项所述的生物可降解电磁屏蔽涂料的制备方法制备得到。
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