CN107674559B - 高抗静电聚醚酮酮静电喷涂粉末涂料、其制备方法及应用 - Google Patents
高抗静电聚醚酮酮静电喷涂粉末涂料、其制备方法及应用 Download PDFInfo
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Abstract
本发明属于涂料技术领域,具体涉及一种高抗静电聚醚酮酮静电喷涂粉末涂料、其制备方法及应用。高抗静电聚醚酮酮静电喷涂粉末涂料由聚醚酮酮树脂和表面涂敷丙烯酸树脂的导电填料组成。聚醚酮酮树脂与表面涂敷丙烯酸树脂的导电填料的质量比为90~99.5:10~0.5。聚醚酮酮树脂熔融指数为20~80g/10min,测试条件为380℃、载荷2.16千克;聚醚酮酮树脂的粉末粒径D50为30~120μm。本发明所提供的高抗静电粉末涂料具有较好的流动性,在静电喷涂时施工简单,所形成的涂层中导电填料在树脂中分散均匀,提高了所制备的静电喷涂涂层的导电性,本发明还提供其制备方法和应用。
Description
技术领域
本发明属于涂料技术领域,具体涉及一种高抗静电聚醚酮酮静电喷涂粉末涂料、其制备方法及应用。
背景技术
聚醚酮酮(PEKK)是一种具有优异性能的特种工程塑料,其具有优异的耐磨性、机械性能、耐化学腐蚀、耐高温等性能。目前已被广泛的应用到航空航天、电子通讯、石油化工、以及医疗卫生等领域。聚醚酮酮属于热塑性树脂,其作为涂层材料来说具有与基材的附着力好,耐磨性好,是用作涂层基体材料的理想聚合物之一。目前已经有工业化的聚醚酮酮静电喷涂粉末应用在汽车和工业部件、家用炊具和食品加工行业。但是由于其本身具有较好的绝缘性能,使其很难应用于对抗静电要求较高的涂层领域。
一般来说通过向涂料中添加导电填料的方式,可以制备抗静电性能的涂料,比如专利CN 107141850就通过添加石墨烯的方法制备了高抗静电性能的液体涂料,专利CN103194142通过添加碳纳米管的方式制备了一种聚醚醚酮抗静电耐高温涂层。
静电粉末喷涂技术是涂装行业最环保的涂装技术之一,其原理是利用静电喷粉设备(静电喷枪)把粉末涂料喷涂到工件的表面,在静电作用下,粉末会均匀的吸附于工件表面,形成粉状的涂层;粉状涂层经过高温烘烤流平固化,变成效果各异(粉末涂料的不同种类效果)的最终涂层。但是同时静电粉末喷涂技术不能喷涂导电性较好的粉末,将聚醚酮酮同碳纳米管或石墨烯简单混合后进行喷涂时,聚醚酮酮粉末经过静电喷枪会在静电作用下,粉末会均匀的吸附于工件表面,但是碳纳米管或石墨烯粉末由于本身自己导电,其粉末经过静电喷枪,在静电作用下并不能带电,也就很难均匀的吸附于工件表面,造成涂层中起导电作用的填料在聚醚酮酮涂层中分布不均。另外,由于作为导电填料的石墨烯是片层结构,而碳纳米管是长棒状结构,因此添加至聚醚酮酮中时,会大大降低静电喷涂粉的流动性,导致采用静电喷枪喷涂时出粉不畅或吐粉等现象的发生。因此将将聚醚酮酮同碳纳米管或石墨烯简单混合后进行喷涂时不能制备出静电喷涂用的聚醚酮酮抗静电粉末涂料。
发明内容
针对现有技术的不足,本发明的目的是提供一种高抗静电聚醚酮酮静电喷涂粉末涂料,具有较好的流动性,在静电喷涂时施工简单,所形成的涂层中导电填料在树脂中分散均匀,提高了所制备的静电喷涂涂层的导电性。
本发明所述的高抗静电聚醚酮酮静电喷涂粉末涂料,由聚醚酮酮树脂和表面涂敷丙烯酸树脂的导电填料组成。
聚醚酮酮树脂为采用现有工艺聚合后所得到的聚醚酮酮树脂。优选地,聚醚酮酮树脂含有对苯二甲酸单元和间苯二甲酸单元,而对苯二甲酸单元占对苯二甲酸和间苯二甲酸单元之和的55%,其熔点为310℃,其特性粘度为0.60dL/g。
聚醚酮酮树脂与表面涂敷丙烯酸树脂的导电填料的质量比为90~99.5:10~0.5。
聚醚酮酮树脂熔融指数为20~80g/10min,测试条件为380℃、载荷2.16千克。
聚醚酮酮树脂的粉末粒径D50为30~120μm,优选为50~80μm。
表面涂敷丙烯酸树脂的导电填料中丙烯酸树脂的重量含量为5%~20%之间,优选为10%~15%之间,所述丙烯酸树脂为液体。
表面涂敷丙烯酸树脂的导电填料的制备方法为:将导电填料、丙烯酸树脂和乙醇混合,搅拌,采用减压蒸馏的方式将乙醇蒸出,然后将剩余的固体真空干燥。
导电填料为碳纳米管或石墨烯中的任意一种。
碳纳米管是多壁碳纳米管,管径8-15μm,长度20-80μm。
制备方法:聚醚酮酮树脂和表面涂敷丙烯酸树脂的导电填料的由混合机进行混合。
混合机为高速混合机,转速为3000~10000转/分。
本发明所述的高抗静电聚醚酮酮静电喷涂粉末涂料的应用,将制品加热至340℃以上,优选350℃,采用金马静电喷枪用静电喷涂的方式将涂料喷涂在制品表面,得到产品,金马静电喷枪的电压为30-50千伏,电流为20-25μA。
所述丙烯酸树脂在340℃以上的高温烘烤时能够完全分解,在最终形成的抗静电涂层中无残留。
综上所述,本发明具有以下优点:
本发明所提供的高抗静电粉末涂料具有较好的流动性,在静电喷涂时施工简单,所形成的涂层中导电填料在树脂中分散均匀,提高了所制备的静电喷涂涂层的导电性。
具体实施方式
下面结合实施例对本发明做进一步说明。
实施例中用到的表面涂敷丙烯酸树脂的导电填料的制备方法如下:
在带有机械搅拌、冷凝管的三口烧瓶中,加入50g导电填料,10g丙烯酸树脂及100g乙醇,开启搅拌,待搅拌10min后关闭搅拌,采用减压蒸馏的方式将三口瓶中的乙醇蒸出,然后将剩余的固体在70℃下真空干燥24h。
实施例中如无特殊说明,则所用聚醚酮酮含有对苯二甲酸单元和间苯二甲酸单元,而对苯二甲酸单元占对苯二甲酸和间苯二甲酸单元之和的55%,其熔点为310℃,其特性粘度为0.60dL/g。所用丙烯酸树脂采用市售AFCONA-4530型号。
所用碳纳米管是多壁碳纳米管,型号为CNT103,管径8-15μm,长度50μm;所用石墨烯是牌号为ug-SGraphene-02的单层石墨烯。
实施例1
将500g D50粒径为50μm的聚醚酮酮树脂,15g表面涂敷丙烯酸树脂的碳纳米管,放入实验室用高速粉碎机中高速搅拌2min,得到涂料1。
实施例2
将500g D50粒径为50μm的聚醚酮酮树脂,50g表面涂敷丙烯酸树脂的碳纳米管,放入实验室用高速粉碎机中高速搅拌2min,得到涂料2。
实施例3
将500g D50粒径为50μm的聚醚酮酮树脂,15g表面涂敷丙烯酸树脂的石墨烯,放入实验室用高速粉碎机中高速搅拌2min,得到涂料3。
实施例4
将500g D50粒径为50μm的聚醚酮酮树脂,2.5g表面涂敷丙烯酸树脂的石墨烯,放入实验室用高速粉碎机中高速搅拌2min,得到涂料4。
对比例1
将500g,D50粒径为50μm的聚醚酮酮树脂,15g石墨烯,放入实验室用高速粉碎机中高速搅拌2min,得到涂料5。
对比例2
将500g,D50粒径为50μm的聚醚酮酮树脂,15g碳纳米管,放入实验室用高速粉碎机中高速搅拌2min,得到涂料6。
对比例3
将500g,D50粒径为50μm的聚醚酮酮树脂,放入实验室用高速粉碎机中高速搅拌2min,得到涂料7。
涂料粉末的流度是评价粉末流化程度的重要参数,它对使用静电喷涂法进行涂装时的施工性能有重要的影响。流度系数越大,静电喷涂时出粉越顺畅,比较容易进行施工,流度越小,采用静电喷涂的方式进行施工时就越不顺畅,容易“吐粉。
将实施例1-4和对比例1-3制得的涂料1-7采用以下方法进行流度系数测试:
称取实施例1-4和对比例1-3制备得到的涂料1-7 250g,放在直径100mm的多孔板的圆柱形聚氯乙烯容器内,从多孔板地步以200L/h的速度通向聚氯乙烯容器,使PEKK粉末进行流化,并通过容器上的一个直径为4mm的小孔使粉末流出30s,测定流出PEKK粉末的质量。采用下式得到粉末涂料的流度系数。
式中R为流度系数;m为流出粉末试样的质量,单位为g;h为容器内原始粉末试样的高度,单位为mm,h1为流化时容器内粉末试样的高度,单位为mm。
静电喷涂:
将6块钢板置于烘箱中,预加热至350℃并在此温度下保持1小时以上,以便工件完全热透,然后将钢板取出,保持钢板在高温状态下,采用金马静电喷枪(电压30-50千伏,电流20-25μA),用静电喷涂的方式分别采用上述涂料在工件表面喷涂得到样品。对样品进行性能测试,测试结果如表1。
表1
样品编号 | 所使用涂料 | 流度系数 | 表面效果 |
样品1 | 涂料1 | 122 | 无针孔、缩孔、起泡等现象 |
样品2 | 涂料2 | 115 | 无针孔、缩孔、起泡等现象 |
样品3 | 涂料3 | 118 | 无针孔、缩孔、起泡等现象 |
样品4 | 涂料4 | 125 | 无针孔、缩孔、起泡等现象 |
样品5 | 涂料5 | 52 | 有缩孔现象 |
样品6 | 涂料6 | 73 | 有缩孔现象 |
样品7 | 涂料7 | 130 | 无针孔、缩孔、起泡等现象 |
Claims (4)
1.一种高抗静电聚醚酮酮静电喷涂粉末涂料,其特征在于:由聚醚酮酮树脂和表面涂敷丙烯酸树脂的导电填料组成;聚醚酮酮树脂含有对苯二甲酸单元和间苯二甲酸单元,对苯二甲酸单元占对苯二甲酸单元和间苯二甲酸单元之和的55%,聚醚酮酮树脂熔点为310℃,聚醚酮酮树脂特性粘度为0.60dL/g;
丙烯酸树脂采用市售AFCONA-4530型号;
表面涂敷丙烯酸树脂的导电填料中丙烯酸树脂的重量含量为5%~20%之间;
表面涂敷丙烯酸树脂的导电填料的制备方法为:将导电填料、丙烯酸树脂和乙醇混合,搅拌,采用减压蒸馏的方式将乙醇蒸出,然后将剩余的固体真空干燥;
高抗静电聚醚酮酮静电喷涂粉末涂料的制备方法为:
聚醚酮酮树脂和表面涂敷丙烯酸树脂的导电填料由混合机进行混合,混合机为高速混合机,转速为3000-10000转/分;
导电填料为碳纳米管或石墨烯中的任意一种。
2.根据权利要求1所述的高抗静电聚醚酮酮静电喷涂粉末涂料,其特征在于:聚醚酮酮树脂与表面涂敷丙烯酸树脂的导电填料的质量比为90~99.5:10~0.5。
3.根据权利要求1所述的高抗静电聚醚酮酮静电喷涂粉末涂料,其特征在于:聚醚酮酮树脂熔融指数为20~80g/10min,测试条件为380℃、载荷2.16千克;聚醚酮酮树脂的粉末粒径D50为30~120μm。
4.根据权利要求1所述的高抗静电聚醚酮酮静电喷涂粉末涂料,其特征在于:碳纳米管是多壁碳纳米管,管径8-15μm,长度20-80μm。
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US11767436B2 (en) * | 2018-08-01 | 2023-09-26 | The Boeing Company | Thermal and cold spray plastic coating covering vehicle fasteners inside fuel tank for lightning strike and other electromagnetic protection |
US11136480B2 (en) | 2018-08-01 | 2021-10-05 | The Boeing Company | Thermal spray plastic coating for edge sealing and fillet sealing |
US20200040214A1 (en) | 2018-08-01 | 2020-02-06 | The Boeing Company | Thermoplastic Coating Formulations For High-Velocity Sprayer Application and Methods For Applying Same |
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