CN110527344A - 一种用于eit检测的导电涂层及其制备方法 - Google Patents
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Abstract
本发明公开了了一种用于EIT检测的导电涂层及其制备方法。该导电涂层,包括如下质量份数的组分:环氧丙烯酸酯树脂40‑80份,稀释剂16‑56份,光引发剂0.5‑2.5份,光敏剂0.5‑2.5份,光稳定剂0.1‑1份,消泡剂0.1‑1份,流平剂0.1‑1份,增韧剂4‑24份,硅烷偶联剂1‑5份,导电填料80‑300份。一种用于EIT检测的导电涂层的制备方法,包括如下步骤:将上述组分按配方量搅拌均匀后即可得到导电填料混合体系,然后将其均匀涂覆在基体材料上,固化后即可得到导电涂层。本发明的导电涂层的拉伸性能好,硬度低,剪切强度高,保证了在基体材料发生破坏变形过程中,涂层被拉伸而不会产生破裂;电阻率低,保证了基体材料损伤前后电阻变化的高效测量;附着力强,涂层附着在基材表面不易脱落。
Description
技术领域
本发明涉及材料技术领域,尤其涉及一种用于EIT检测的导电涂层及其制备方法。
背景技术
EIT是利用被测物体电导率的变化来进行识别的可视化无损检测技术。传统EIT方法直接对基体材料进行测量(如人体,混凝土等),对缺陷或损伤的检测基于材料电导率的变化。对混凝土等土木工程材料而言,含水率、配比、龄期直接影响材料的电学性能,EIT检测方法对材料本身的物理电学性质极为敏感,检测效果对于电导率介于导体和绝缘体之间的材料效果最好,但混凝土是一种接近于绝缘体的材料,导致电学数据采集精度偏低,EIT成像检测效果欠佳,影响了该技术在土木工程无损检测领域的推广运用。具体来说,在混凝土的使用寿命期间含水率变化、配比不同、龄期长短等可导致电导率的显着变化,同一混凝土构件的电导率通常在空间上也分布不均匀。室内试验中,多对基体进行浸润处理以达到增高电导率、改善均匀性、提高数据采集精度的目的,而在实际应用中很难完成浸润程序,当材料表面非常干燥时,所有电学检测方法的灵敏度都特别低,EIT检测效果欠佳。
发明内容
本发明的目的在于,针对现有技术的上述不足,提出一种拉伸性能好,硬度低,剪切强度高的用于EIT检测的导电涂层及其制备方法。
本发明的一种用于EIT检测的导电涂层,包括如下质量份数的组分:
环氧丙烯酸酯树脂40-80份,稀释剂16-56份,光引发剂0.5-2.5份,光敏剂0.5-2.5份,光稳定剂0.1-1份,消泡剂0.1-1份,流平剂0.1-1份,增韧剂4-24份,硅烷偶联剂1-5份,导电填料80-300份。
优选的,所述稀释剂为三羟甲基丙烷三丙烯酸酯、N-乙烯基吡咯烷酮和1,4-丁二醇二缩水甘油醚中的一种或多种。
优选的,所述光引发剂1-羟基环己基苯基甲酮、2-甲基-1-(4-甲硫基苯基)-2-吗琳基-1-丙酮和2-羟基-2-甲基-1-苯基-1-丙酮其中的一种或多种。
优选的,所述光敏剂为二苯甲酮、2,4-二羟基二苯甲酮和米蚩酮其中的一种或多种。
优选的,所述增韧剂为液体聚硫橡胶、液体硅橡胶和聚醚其中的一种或多种。
优选的,所述硅烷偶联剂为γ-氨丙基三乙氧基硅烷、乙烯基三乙氧基硅烷和γ-缩水甘油醚氧丙基三甲氧基硅烷其中的一种或多种。
优选的,所述导电填料为银包铜粉、碳纳米管和石墨烯其中的一种或多种。
优选的,所述银包铜粉为含银质量分数10%,粒径10μm的片状。
一种如上述的一种用于EIT检测的导电涂层的制备方法,包括如下步骤:
步骤1、按配方量将环氧丙烯酸树脂和稀释剂充分混合均匀后得到混合溶液。
步骤2、按配方量将光引发剂和光敏剂两者充分混合,然后将其添加到步骤1的混合溶液中得到光固化混合体系。
步骤3、按配方量将光稳定剂、消泡剂、流平剂和硅烷偶联剂添加到步骤2得到的光固化混合体系中,充分搅拌均匀后即可得到有机载体。
步骤4、按配方量将导电填料分两次添加到步骤3的有机载体中搅拌一段时间,然后添加增韧剂,充分搅拌均匀后即可得到导电填料混合体系。
步骤5、将步骤4中得到的导电填料混合体系均匀涂覆在基体材料上,固化后即可得到导电涂层。
优选的,步骤5中,膜厚约为100~300μm,固化通过静置30-60min后再平放于紫外光固机中固化60-120min或者放置自然光下6-12h。
优选的,环氧丙烯酸酯树脂是用环氧树脂和丙烯酸在催化剂的作用下经开环酯化而制得。其光固化速度较快,而且其固化后的涂膜具有光泽度好、耐腐蚀、耐热及电化学性优异等特点。
本发明的一种用于EIT检测的导电涂层的拉伸性能好,硬度低,剪切强度高,保证了在基体材料发生破坏变形过程中,涂层被拉伸而不会产生破裂;电阻率低,保证了基体材料损伤前后电阻变化的高效测量;附着力强,涂层附着在基材表面不易脱落,保证了基体材料与涂层之间具有良好的接触,可以适应不同的施工和应用条件,同时建立了不同试剂配比涂层性能之间的关系,因此在施工中可以通过调控相应试剂配比来控制涂层的相关性能,对实际工程应用具有重要意义。本发明的制备方法简单,成本低。
附图说明
图1为本发明的制备方法流程图。
具体实施方式
以下是本发明的具体实施例并结合附图,对本发明的技术方案作进一步的描述,但本发明并不限于这些实施例。
实施例1
按照下列质量称取原材料:环氧丙烯酸酯树脂40份,三羟甲基丙烷三丙烯酸酯16份,1-羟基环己基苯基甲酮0.5份,二苯甲酮0.5份,光稳定剂0.1份,消泡剂0.1份,流平剂0.1份,液体聚硫橡胶4份,γ-氨丙基三乙氧基硅烷1份,石墨烯80份。
请参考图1,制备方法如下:
步骤1、按配方量将环氧丙烯酸树脂和稀释剂充分混合均匀后得到混合溶液。
步骤2、按配方量将光引发剂和光敏剂两者充分混合,然后将其添加到步骤1的混合溶液中得到光固化混合体系。
步骤3、按配方量将消泡剂、流平剂和硅烷偶联剂添加到步骤2得到的光固化混合体系中,充分搅拌均匀后即可得到有机载体。
步骤4、按配方量将导电填料分两次添加到步骤3的有机载体中搅拌一段时间,然后添加增韧剂,使用强力搅拌机1200r/min,60min,充分搅拌均匀后即可得到导电填料混合体系。在第一次添加的导电填料充分混合搅拌均匀后才可添加第二次。
步骤5、将步骤4中得到的银包铜粉混合体系均匀涂覆在基体材料上,膜厚约为300μm,静置30min后再平放于紫外光固机中固化60min,即可得到UV固化环氧丙烯酸树脂柔软导电涂层。
上述制备的UV导电涂层相关宏观性性能测试方法如下:
(1)剪切强度:将图层均匀地涂在40mm×20mm的聚酰亚胺薄膜上,在室温条件下剪切试验机以5mm/min的加载速度测试其剪切性能。
(2)伸长率:将图层均匀地涂在40mm×20mm的聚酰亚胺薄膜上,在室温条件下拉力试验机以500±30mm/min的加载速度加载并计算伸长率。
(3)硬度:将图层均匀地涂抹在40mm×20mm×5mm的长方体玻璃片上,在室温条件下用邵氏A硬度计测试其硬度。
(4)附着力:将图层均匀地涂抹在40mm×20mm×5mm的长方体玻璃片上,在室温条件下用胶带法测试其附着力。
(5)电阻率:将图层均匀地涂抹在40mm×20mm×5mm的长方体玻璃片上,在室温条件下用精密电阻测试仪测量电阻并计算电阻率。
按照上述测试方法测试出本实例制得的基于UV工艺的柔软导电涂层的主要性能指标为:剪切强度为5.32MPa,伸长率为29.7%,硬度为42A,附着力为4B,电阻率为1.435×10-3Ω·cm。
实施例2
按照下列质量称取原材料:环氧丙烯酸酯树脂(EA)60份,三羟甲基丙烷三丙烯酸酯和N-乙烯基吡咯烷酮30份,1-羟基环己基苯基甲酮和2-甲基-1-(4-甲硫基苯基)-2-吗琳基-1-丙酮1.2份,2,4-二羟基二苯甲酮1.2份,光稳定剂0.3份,消泡剂0.3份,流平剂0.3份,液体聚硫橡胶和液体硅橡胶12份,乙烯基三乙氧基硅烷和γ-缩水甘油醚氧丙基三甲氧基硅烷1.8份,银包铜粉150份。按照实施例1中的制备方法,在室温下制得导电涂层。
按照实施例1中的测试方法测试出本实例制得的基于UV工艺的柔软导电涂层的主要性能指标为:剪切强度为5.66MPa,伸长率为20.3%,硬度为48A,附着力为4B,电阻率为1.366×10-3Ω·cm。
实施例3
按照下列质量称取原材料:环氧丙烯酸酯树脂(EA)80份,N-乙烯基吡咯烷酮56份,2-羟基-2-甲基-1-苯基-1-丙酮2.5份,米蚩酮2.5份,UV-5311份,消泡剂1份,流平剂1份,聚醚24份,乙烯基三乙氧基硅烷5份,银包铜粉300份。按照实施例1中的制备方法,在室温下制得导电涂层。
按照实施例1中的测试方法测试出本实例制得的基于UV工艺的柔软导电涂层的主要性能指标为:剪切强度为5.78MPa,伸长率为21.3%,硬度为53A,附着力为4B,电阻率为1.140×10-3Ω·cm。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
以上未涉及之处,适用于现有技术。
虽然已经通过示例对本发明的一些特定实施例进行了详细说明,但是本领域的技术人员应该理解,以上示例仅是为了进行说明,而不是为了限制本发明的范围,本发明所属技术领域的技术人员可以对所描述的具体实施例来做出各种各样的修改或补充或采用类似的方式替代,但并不会偏离本发明的方向或者超越所附权利要求书所定义的范围。本领域的技术人员应该理解,凡是依据本发明的技术实质对以上实施方式所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围。
Claims (10)
1.一种用于EIT检测的导电涂层,其特征在于,包括如下质量份数的组分:
环氧丙烯酸酯树脂40-80份,稀释剂16-56份,光引发剂0.5-2.5份,光敏剂0.5-2.5份,光稳定剂0.1-1份,消泡剂0.1-1份,流平剂0.1-1份,增韧剂4-24份,硅烷偶联剂1-5份,导电填料80-300份。
2.如权利要求1所述的一种用于EIT检测的导电涂层,其特征在于:所述稀释剂为三羟甲基丙烷三丙烯酸酯、N-乙烯基吡咯烷酮和1,4-丁二醇二缩水甘油醚中的一种或多种。
3.如权利要求2所述的一种用于EIT检测的导电涂层,其特征在于:所述光引发剂1-羟基环己基苯基甲酮、2-甲基-1-(4-甲硫基苯基)-2-吗琳基-1-丙酮和2-羟基-2-甲基-1-苯基-1-丙酮其中的一种或多种。
4.如权利要求3所述的一种用于EIT检测的导电涂层,其特征在于:所述光敏剂为二苯甲酮、2,4-二羟基二苯甲酮和米蚩酮其中的一种或多种。
5.如权利要求4所述的一种用于EIT检测的导电涂层,其特征在于:所述增韧剂为液体聚硫橡胶、液体硅橡胶和聚醚其中的一种或多种。
6.如权利要求5所述的一种用于EIT检测的导电涂层,其特征在于:所述硅烷偶联剂为γ-氨丙基三乙氧基硅烷、乙烯基三乙氧基硅烷和γ-缩水甘油醚氧丙基三甲氧基硅烷其中的一种或多种。
7.如权利要求1-6任一项所述的一种用于EIT检测的导电涂层,其特征在于:所述导电填料为银包铜粉、碳纳米管和石墨烯其中的一种或多种。
8.如权利要求7所述的一种用于EIT检测的导电涂层,其特征在于:所述银包铜粉为含银质量分数10%,粒径10μm的片状。
9.一种如权利要求1-8任一项所述的一种用于EIT检测的导电涂层的制备方法,其特征在于:包括如下步骤:
步骤1、按配方量将环氧丙烯酸树脂和稀释剂充分混合均匀后得到混合溶液;
步骤2、按配方量将光引发剂和光敏剂两者充分混合,然后将其添加到步骤1的混合溶液中得到光固化混合体系;
步骤3、按配方量将光稳定剂、消泡剂、流平剂和硅烷偶联剂添加到步骤2得到的光固化混合体系中,充分搅拌均匀后即可得到有机载体;
步骤4、按配方量将导电填料分两次添加到步骤3的有机载体中搅拌一段时间,然后添加增韧剂,充分搅拌均匀后即可得到导电填料混合体系;
步骤5、将步骤4中得到的导电填料混合体系均匀涂覆在基体材料上,固化后即可得到导电涂层。
10.如权利要求9所述的一种用于EIT检测的导电涂层的制备方法,其特征在于:步骤5中,膜厚约为100~300μm,固化通过静置30-60min后再平放于紫外光固机中固化60-120min或者放置自然光下6-12h。
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