CN116239919B - 一种蒸发器防结霜超疏水涂层及其制备方法 - Google Patents
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Abstract
本申请涉及功能涂层技术领域,具体公开了一种蒸发器防结霜超疏水涂层及其制备方法,所述涂层包括溶剂、添加剂A、添加剂B和硅烷偶联剂;所述涂层制备方法包括:S1、按重量份计,将添加剂A和添加剂B先进行搅拌混合,得混合添加剂;S2、将硅烷偶联剂加入到溶剂中进行初混合,然后加入混合添加剂继续混合均匀得涂层浆料;S3、将基材预处理后,采用喷涂法将涂层浆料均匀喷涂在基材表面,固化即得所需蒸发器防结霜超疏水涂层;上述制备方法简单,制备条件温和,适合工业化生产,所得涂层水接触角可达180°,导热系数可达15.82 W·(m·K)‑1,用于热泵系统和冷库制冷系统的蒸发器,可有效抑制蒸发器表面结霜和加速融霜。
Description
技术领域
本申请涉及功能涂层技术领域,更具体地说,它涉及一种蒸发器防结霜超疏水涂层及其制备方法。
背景技术
蒸发器是将液态物质转化为气态的物体,在工业领域大量应用。例如,在冷库制冷系统中,蒸发器是制冷四大件中很重要的一个部件,低温的冷凝液体通过蒸发器,与外界的空气进行热交换,气化吸热,达到制冷的效果。在热泵系统中,将蒸发器蒸出的二次蒸汽用压缩机压缩,提高其压力,使其饱和温度超过溶液的沸点,然后送回蒸发器的加热室作为加热蒸汽。
在实际应用过程中,冷库制冷系统和冬天北方热泵系统的蒸发器,因工作环境温度低、湿度大等因素,极易发生结霜。而霜是热的不良导体,结霜会增加蒸发器的传热热阻,降低换热效率,尤其是当结霜达到一定厚度时,还会堵塞排管以及翅片之间的通道,严重时蒸发器回液还会因吸热不足不能完全蒸发,进而造成压缩机的损伤。
现有研究表明,在蒸发器表面喷涂超疏水涂层可以有效抑制结霜,加速融霜。但现有的超疏水涂层导热系数不高,自身热阻较大,喷涂涂层后会增加蒸发器传热过程的导热热阻。基于上述陈述,本申请提供了一种蒸发器防结霜超疏水涂层及其制备方法,旨在提高涂层疏水性能的同时,提高涂层的导热性能。
发明内容
为了解决当前超疏水涂层导热系数不高,自身热阻较大,喷涂涂层后会增加蒸发器传热过程的导热热阻等问题,本申请提供了一种蒸发器防结霜超疏水涂层及其制备方法。
第一方面,本申请提供了一种蒸发器防结霜超疏水涂层,采用如下的技术方案:
一种蒸发器防结霜超疏水涂层,包括以下重量份的原料:溶剂80-120份、添加剂A12-20份、添加剂B 4-7份、硅烷偶联剂1.5-2.5份。
优选的,所述溶剂100份、添加剂A 16份、添加剂B 5.6份、硅烷偶联剂2份。
通过采用上述技术方案,本申请选用原料简单,配方科学、配比严谨,所得涂层水接触角可达180°,导热系数可达15.82W·(m·K)-1,用于热泵系统和冷库制冷系统的蒸发器,可有效抑制蒸发器表面结霜和加速融霜。
优选的,所述溶剂为改性特氟龙。
优选的,所述改性特氟龙为质量比1:0.1-0.3:0.5-0.7的特氟龙分散液、液体石蜡和去离子水的混合液。
通过采用上述技术方案,本申请选用特氟龙分散液、液体石蜡和去离子水的混合液作为溶剂,通过控制特氟龙分散液、液体石蜡和去离子水的质量比,能够保证获得涂层浆料的粘度,有利于涂层浆料更均匀地喷涂在基材表面,同时有利于提高涂层浆料的分散稳定性,进而提高涂层的耐热、耐寒、疏水、导热、防腐蚀等性能。
优选的,所述添加剂A为质量比1:0.6的纳米二氧化硅和纳米二氧化钛。
优选的,所述纳米二氧化硅的粒径为80-100nm,纳米二氧化钛的粒径为1-10nm。
通过采用上述技术方案,本申请以纳米二氧化硅和纳米二氧化钛复配作为添加剂A,通过控制两者的质量比和选用粒径,构造微纳米多尺寸结构,更好的掺杂在溶剂体系中,改善体系中各组分的界面结合张力,实现均匀分布,进而提高制得涂层的附着力、强度、柔韧性、自清洁、防水防渗、防腐蚀、导热等性能。
优选的,所述添加剂B为质量比1:0.12的碳化硅微粉和纳米石墨烯。
优选的,所述碳化硅微粉的粒径为700-800nm,纳米石墨烯的粒径为30-50nm。
通过采用上述技术方案,本申请选用高导热的碳化硅微粉和纳米石墨烯复配作为添加剂B,可以在保证获得高导热性能涂层的同时,降低生产成本;通过控制两者的质量比和选用粒径,可以实现更好的掺杂在溶剂体系中,提高制得涂层的硬度、导热性、疏水性和化学稳定性。
优选的,所述硅烷偶联剂为甲基三乙氧基硅烷和/或3-(2,3-环氧丙氧)丙基三甲氧基硅烷。
优选的,所述硅烷偶联剂包括质量比1:1的甲基三乙氧基硅烷和3-(2,3-环氧丙氧)丙基三甲氧基硅烷。
通过采用上述技术方案,本申请采用低表面能的甲基三乙氧基硅烷和3-(2,3-环氧丙氧)丙基三甲氧基硅烷对涂层体系中的各组分进行改性,有效增强了体系中各组分的亲和力,进一步提高制得涂层的强度、韧性、疏水性、导电性和耐腐蚀性。
第二方面,本申请提供了一种蒸发器防结霜超疏水涂层的制备方法,采用如下的技术方案:
一种蒸发器防结霜超疏水涂层的制备方法,包括以下制备步骤:
S1、按重量份计,将添加剂A和添加剂B先进行搅拌混合,得混合添加剂;
S2、将硅烷偶联剂加入到溶剂中进行初混合,然后加入混合添加剂继续混合均匀得涂层浆料;S3、将基材预处理后,采用喷涂法将涂层浆料均匀喷涂在基材表面,固化即得所需蒸发器防结霜超疏水涂层。
优选的,所述步骤S1中搅拌混合具体指:在450-550r/min的转速下,磁力搅拌0.8-1.2h。
优选的,所述步骤S2中混合条件具体为:先在1300-1500r/min的转速下,磁力搅拌0.2-0.3h进行初混合,然后保持转速不变继续混合1.5-2.5h。
优选的,所述步骤S3中基材预处理具体指:先将待喷涂的不锈钢圆片经质量百分浓度为6%的NaOH溶液浸泡20min后取出;然后以粒度为500μm的白刚玉做喷砂磨料,控住喷砂压力为0.2-0.3MPa,喷砂距离30-50mm,喷砂时间80-120s,进行喷砂处理;最后清洗干燥获得涂层基材。
优选的,所述步骤S3中喷涂距离为280-320mm,喷涂角度为90°。
优选的,所述步骤S3中固化条件为:先在室温下固化0.4-0.6h,然后在160-200℃环境中固化1.5-2.5h。
通过采用上述技术方案,本申请先将固态添加剂混合,然后将溶剂和硅烷偶联剂混合配制混合溶液,最后将混合添加剂加入到混合溶液中制得涂层浆料,将涂层浆料喷涂至基材表面,固化即得所需的蒸发器防结霜超疏水涂层;上述制备方法简单,制备条件温和,适合工业化生产,喷涂前通过对基材进行预处理,能够有效去除基材表面的油脂、锈迹,提高基材表面粗糙度,进一步提高涂层的附着力;本申请所得涂层综合性能优异,尤其同时兼具高疏水性和高导热性,可以保证较高的导热系数,用于热泵系统和冷库制冷系统的蒸发器,可有效抑制蒸发器表面结霜和加速融霜。
综上所述,本申请具有以下有益效果:
本申请以特氟龙分散液、液体石蜡和去离子水的混合液为溶剂;以甲基三乙氧基硅烷和3-(2,3-环氧丙氧)丙基三甲氧基硅烷复配为低表面能物质,以纳米二氧化硅和纳米二氧化钛复配作为添加剂A构造微纳米多尺度结构,同时添加高导热性能的碳化硅微粉和纳米石墨烯作为添加剂B,制备超疏水涂层,所得涂层固化后硬度高、附着力高,耐寒、耐热、耐腐蚀性好,本申请中各组分协同作用,有效改进了涂层的疏水性,且导热性显著提高。
本申请超疏水涂层的水接触角可达180°,用于热泵系统和冷库制冷系统的蒸发器,能够减少或避免水滴的附着,进而能够延缓或者避免排管以及翅片表面冰霜的形成,另外,涂层导热性能好,导热系数可达15.82W·(m·K)-1,可以进一步提高蒸发器的热交换效率,有效抑制蒸发器表面结霜和加速融霜。
具体实施方式
以下结合实施例对本申请作进一步详细说明。
实施例1-9提供了一种蒸发器防结霜超疏水涂层及其制备方法,以下以实施例1为例进行说明。
实施例1
一种蒸发器防结霜超疏水涂层,包括原料:溶剂80Kg、添加剂A 12Kg、添加剂B4Kg、硅烷偶联剂1.5Kg;
其中,溶剂为质量比1:0.1:0.5的特氟龙分散液AD915E、液体石蜡和去离子水的混合液;
添加剂A为质量比1:0.6的纳米二氧化硅和纳米二氧化钛,纳米二氧化硅的粒径为80-100nm,纳米二氧化钛的粒径为1-10nm;
添加剂B为质量比1:0.12的碳化硅微粉和纳米石墨烯;碳化硅微粉的粒径为700-800nm,纳米石墨烯的粒径为30-50nm;
硅烷偶联剂为甲基三乙氧基硅烷。
一种蒸发器防结霜超疏水涂层的制备方法,包括以下制备步骤:
S1、按重量份计,将添加剂A和添加剂B先在500r/min的转速下,磁力搅拌1h,进行搅拌混合,得混合添加剂;
S2、将硅烷偶联剂加入到溶剂中,在1400r/min的转速下,磁力搅拌0.3h进行初混合,然后加入混合添加剂保持转速不变继续混合2h得涂层浆料;
S3、先将待喷涂的不锈钢圆片经质量百分浓度为6%的NaOH溶液浸泡20min后取出;然后以粒度为500μm的白刚玉做喷砂磨料,控住喷砂压力为0.25MPa,喷砂距离40mm,喷砂时间100s,进行喷砂处理;最后清洗干燥获得涂层基材;
控制喷涂距离为300mm,喷涂角度为90°,采用喷涂法将步骤S2中制得的涂层浆料均匀喷涂在涂层基材表面,喷涂完成后,先在室温下固化0.5h,然后在180℃环境中固化2h,制得所需蒸发器防结霜超疏水涂层。
实施例2-5,同实施例1,区别仅在于,超疏水涂层的制备原料的质量不同,具体见表1。
表1:实施例1-5超疏水涂层的制备原料的质量
实施例6
实施例6,同实施例3,不同之处仅在于,溶剂为质量比1:0.2:0.6的特氟龙分散液AD915E、液体石蜡和去离子水的混合液。
实施例7
实施例7,同实施例3,不同之处仅在于,溶剂为质量比1:0.3:0.7的特氟龙分散液AD915E、液体石蜡和去离子水的混合液。
实施例8
实施例8,同实施例3,不同之处仅在于,硅烷偶联剂为3-(2,3-环氧丙氧)丙基三甲氧基硅烷。
实施例9
实施例9,同实施例3,不同之处仅在于,硅烷偶联剂包括质量比1:1的甲基三乙氧基硅烷和3-(2,3-环氧丙氧)丙基三甲氧基硅烷。
为了验证本申请实施例1-9中制备的蒸发器防结霜超疏水涂层的疏水性和导热性,申请人设置了对比例1-9,具体如下:
对比例1
对比例1,同实施例1,不同之处仅在于,溶剂为质量比1:0.1的特氟龙分散液AD915E和液体石蜡的混合液。
对比例2
对比例2,同实施例1,不同之处仅在于,溶剂为质量比1:0.5的特氟龙分散液AD915E和去离子水的混合液。
对比例3
对比例3,同实施例1,不同之处仅在于,溶剂为特氟龙分散液AD915E。
对比例4
对比例4,同实施例1,不同之处仅在于,纳米二氧化硅和纳米二氧化钛的粒径均为80-100nm。
对比例5
对比例5,同实施例1,不同之处仅在于,纳米二氧化硅和纳米二氧化钛的粒径均为1-10nm。
对比例6
对比例6,同实施例1,不同之处仅在于,将纳米二氧化钛等质量替换为纳米二氧化硅。
对比例7
对比例7,同实施例1,不同之处仅在于,碳化硅微粉和纳米石墨烯的粒径均为700-800nm。
对比例8
对比例8,同实施例1,不同之处仅在于,碳化硅微粉和纳米石墨烯的粒径均为30-50nm。
对比例9
对比例9,同实施例1,不同之处仅在于,纳米石墨烯等质量替换为碳化硅微粉。
性能测试
将本申请实施例1-9和对比例1-9中的超疏水涂层制成厚度为85μm的涂层样品,测试涂层的水接触角(GB/T 30693-2014)和导热系数(ASTM E1530),得出如下表2所示结果:
表2:涂层样品性能测试结果
由上述表2显示数据可知:本申请实施例制备的涂层水接触角最高可达180°,导热系数最高可达15.82W·(m·K)-1,说明本申请涂层可同时兼具高疏水性和高导热性。
对比实施例1和对比例1-3可知:溶剂选用特氟龙分散液、液体石蜡和去离子水的混合液,且质量比1:0.1-0.3:0.5-0.7时,涂层具有更高的疏水性和导热性。
对比实施例1和对比例4-6可知:添加剂A选用质量比1:0.6的纳米二氧化硅和纳米二氧化钛复配,同时控制纳米二氧化硅的粒径为80-100nm,纳米二氧化钛的粒径为1-10nm,可进一步提高涂层的疏水性和导热性。
对比实施例1和对比例7-9可知:添加剂B选用质量比1:0.12的碳化硅微粉和纳米石墨烯复配,同时控制碳化硅微粉的粒径为700-800nm,纳米石墨烯的粒径为30-50nm,可进一步提高涂层的疏水性和导热性。
本具体实施例仅仅是对本申请的解释,其并不是对本申请的限制,本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性贡献的修改,但只要在本申请的权利要求范围内都受到专利法的保护。
Claims (4)
1.一种蒸发器防结霜超疏水涂层,其特征在于,包括以下重量份的原料:溶剂80-120份、添加剂A12-20份、添加剂B 4-7份、硅烷偶联剂1.5-2.5份;
所述溶剂为改性特氟龙;所述改性特氟龙为质量比1:0.1-0.3:0.5-0.7的特氟龙分散液、液体石蜡和去离子水的混合液;
所述添加剂A为质量比1:0.6的纳米二氧化硅和纳米二氧化钛;所述纳米二氧化硅的粒径为80-100nm,纳米二氧化钛的粒径为1-10nm;
所述添加剂B为质量比1:0.12的碳化硅微粉和纳米石墨烯;所述碳化硅微粉的粒径为700-800nm,纳米石墨烯的粒径为30-50nm。
2.根据权利要求1所述的蒸发器防结霜超疏水涂层,其特征在于,包括以下重量份的原料:溶剂100份、添加剂A16份、添加剂B 5.6份、硅烷偶联剂2份。
3.根据权利要求1所述的蒸发器防结霜超疏水涂层,其特征在于,所述硅烷偶联剂为甲基三乙氧基硅烷和/或3-(2,3-环氧丙氧)丙基三甲氧基硅烷。
4.一种权利要求1-3任一项所述的蒸发器防结霜超疏水涂层的制备方法,其特征在于,包括以下制备步骤:
S1、按重量份计,将添加剂A和添加剂B先进行搅拌混合,得混合添加剂;
S2、将硅烷偶联剂加入到溶剂中进行初混合,然后加入混合添加剂继续混合均匀得涂层浆料;
S3、将基材预处理后,采用喷涂法将涂层浆料均匀喷涂在基材表面,固化即得所需蒸发器防结霜超疏水涂层。
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