CN107779003A - 一种利用光热效应实现粉末涂料快速固化的方法 - Google Patents
一种利用光热效应实现粉末涂料快速固化的方法 Download PDFInfo
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Abstract
本发明涉及一种利用光热效应实现粉末涂料快速固化的方法。将光热转换填料与树脂混合均匀并粉碎,然后将粉碎后的粉末涂料均匀置于基板上,所用基板为玻璃、铝片或钢板;选择光源照射粉末涂料,达到固化温度60~330℃,使粉末涂料固化。本发明利用光热转换填料将光能直接转化为热能引发粉末涂料固化,较现有固化技术,固化时间更短,且固化涂层更均匀。利用光热转换填料的光热效应,只需在粉末涂料中加入少量光热转换填料,在红外光或可见光或太阳光的照射下即可实现粉末涂料的快速固化。利用丰富的太阳光、红外光、可见光实现固化,经济环保且操作简单。
Description
技术领域
本发明涉及粉末涂料固化领域,具体涉及一种利用光热效应实现粉末涂料快速固化的方法。
背景技术
粉末涂料主要是由树脂、固化剂、颜料、填料、助剂等混合而成,通过静电喷涂方式涂覆于被涂物的表面,通常条件下,再经过烘烤使其熔融流平、固化成膜。由于不含任何有机溶剂,污染低、利用率高、能耗低、工艺简单,目前已成为大家认可的“4E”型(高的生产效率、优良的涂膜性能、生态环保、经济)涂料。
粉末涂料的固化一般有两种方式,第一种是热固化,即利用高红外或热对流等技术使粉末涂料加热熔融固化。此种方法固化温度高,不适用于需低温固化的介质。第二种是紫外光固化,加入光引发剂后,利用紫外光产生的自由基或阴、阳离子以实现粉末涂料的固化。其固化速度快,固化温度低,适用于一些要求固化温度比较低的物质。
光具有瞬时性、方向性、远程性、环保、穿透性强等特点,光热转换填料可有效地吸收光能并将其转换为热能。因此,利用光及光热转换填料进行粉末涂料的固化是未来发展的方向。中国专利CN201210228061.4中介绍了一种用于UV光固化粉末涂料及其制备方法和CN201610773847.2中介绍的一种UV光固化粉末涂料。除此以外,还有其他一些紫外光固化粉末涂料。但紫外光能量较高,对人体及生物有害;利用紫外光固化粉末涂料对光引发剂及成膜树脂都具有一定的要求,所以目前可用于紫外光固化的粉末涂料种类较少。而红外光、可见光的能量相对较低,更加安全。太阳光中可见光约占50%,红外光约43%,紫外光约7%。因此,开发出利用红外光、可见光或太阳光实现粉末涂料快速固化的方法具有巨大的应用价值。
基于上述,本发明提供一种利用光热效应实现粉末涂料快速固化的方法,通过在粉末涂料中加入光热转换填料,使粉末涂料在红外光、可见光或太阳光下即可实现快速固化。
发明内容
发明目的:本发明的目的是提供一种利用红外光、可见光或太阳光即可实现粉末涂料快速固化的方法。
技术方案:为达到此目的,本发明采用以下技术方案:
一种利用光热效应实现粉末涂料快速固化的方法,其特征在于包括以下步骤:
1)将光热转换填料与树脂混合均匀并粉碎,然后将粉碎后的粉末涂料均匀置于基板上,
所用基板为玻璃、铝片或钢板;
2)选择光源照射粉末涂料,达到固化温度60-330℃,使粉末涂料固化。
所述的光热转换填料含量为树脂用量的0.01-20%。
所述树脂为热塑性树脂、热固性树脂。
所述热塑性树脂包括聚乙烯、聚丙烯、聚酯树脂、聚氯乙烯、聚苯硫醚树脂、聚酰胺、乙烯-乙酸乙烯共聚物或醋酸丁酸纤维素聚氟乙烯。
所述热固性树脂为双酚A型环氧树脂,其固化剂为二羧酸二陷阱、咪唑类、多元羧酸盐、酸酐加成物、酚醛树脂、聚酯树脂或丙烯酸树脂中的一种;聚酯树脂,其固化剂为异氰脲酸三缩水甘油酯、羟烷基酰胺中的一种;羟基聚酯树脂,其固化剂为封闭型异氰酸酯;缩水甘油基丙烯酸树脂,其固化剂为多元羧酸、多元胺、多元酚、多元羟基树脂或聚酯树脂中的一种。
所述光热转换填料为炭黑、碳纳米管、石墨、石墨烯、聚苯胺、硫化铜、四氧化三铁中的任一种或多种。
本发明与现有技术相比,本发明具备如下的有益效果:
1)本发明利用光热转换填料将光能直接转化为热能引发粉末涂料固化,较现有固化技术,固化时间更短,且固化涂层更均匀。
2)本发明利用光热转换填料的光热效应,只需在粉末涂料中加入少量光热转换填料,在红外光或可见光或太阳光的照射下即可实现粉末涂料的快速固化。
3)本发明利用丰富的太阳光、红外光、可见光实现固化,经济环保且操作简单。
附图说明
图1为利用光热效应实现粉末涂料快速固化的示意图;
图2为将2.00聚酯树脂与0.02炭黑混合均匀并粉碎后所得粉末涂料的扫描电镜图;
图3为制备的聚酯粉末涂料经500W日光灯照射后,90s即实现完全固化的扫描电镜图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合具体本发明实施例,对本发明实施例中的技术方案进行清楚、完整地描述。显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例,基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
按照图1为利用光热效应实现粉末涂料快速固化的示意图。
(1).将光热转换填料与树脂混合均匀并粉碎生产粉末涂料,然后将粉末涂料均匀置于基板上,所用基板为玻璃、铝片或钢板;光热转换填料含量为树脂用量的0.01~20%;
(2).选择光源:用光源照射粉末涂料,达到固化温度60~330℃,使粉末涂料固化;
实施例一:
利用光热效应实现聚乙烯粉末涂料快速固化的方法:
(1)将1.00g石蜡粉末分散在约20ml乙醇中,加入0.02g的聚苯胺和0.05g硫化铜,搅拌后超声2min,使聚苯胺和聚乙烯分散均匀,待乙醇蒸发即可获得混合均匀的石蜡-聚苯胺-硫化铜粉末涂料;
(2)将混合均匀的石蜡-聚苯胺-硫化铜粉末涂料置于基板上,用500W的日光灯照射粉末涂料,照射距离19.5±0.3cm,固化温度65±5℃,15±1s时粉末涂料固化完全。
实施例二:
利用光热效应实现聚乙烯粉末涂料快速固化的方法:
(1)将1.00g聚乙烯粉末分散在约20ml乙醇中,加入0.10g的聚苯胺,搅拌后超声2min,使聚苯胺和聚乙烯分散均匀,待乙醇蒸发即可获得混合均匀的聚乙烯-聚苯胺粉末涂料。
(2)将混合均匀的聚乙烯-聚苯胺粉末涂料置于基板上,用500W的红外灯照射粉末涂料,照射距离9.5±0.3cm,固化温度125±2℃,90~100s时粉末涂料固化完全。
实施例三:
利用光热效应实现聚酯粉末涂料快速固化的方法:
(1)将2.00g聚酯粉末与0.02g炭黑混合均匀并粉碎制备聚酯粉末涂料,将聚酯粉末涂料置于基板上。
(2)用500W日光灯(产生可见光)照射,照射距离10±0.3cm,照射时间分别为60、75、90s左右时分别得到不同固化状态的聚酯涂层。其中90s左右时聚酯粉末涂料固化完全,固化温度140℃。
图2是将聚酯树脂与1%炭黑混合均匀并进一步粉碎后制备的粉末涂料的扫描电镜图,图3将所制备的聚酯粉末涂料90s后完全固化的扫描电镜图。
实施例四:
利用光热效应实现聚偏氟乙烯粉末快速固化的方法:
(1)将1.00g聚偏氟乙烯粉末分散在10ml的乙醇中,后加入0.05g的硫化铜粉末,搅拌后超声2min,使硫化铜和聚偏氟乙烯分散均匀,待乙醇蒸发完毕得到混合均匀的聚偏氟乙烯-硫化铜粉末。
(2)将混合均匀的聚偏氟乙烯-硫化铜粉末涂料置于基板上,在样品上盖上一片载玻片后在太阳光下,太阳光强度为880±20勒克斯,用直径为30cm,焦距为20cm的菲涅尔透镜在焦距附近照射粉末,照射时间为3±0.3s时,粉末固化完全,形成聚偏氟乙烯膜,固化温度260±10℃。
实施例五:
利用光热效应实现聚乙烯粉末涂料快速固化的方法:
(1)将1.000g的聚乙烯粉末分散在20ml乙醇中,加入0.075g的碳纳米管,搅拌后超声至碳纳米管分散均匀,待乙醇蒸发即可获得混合均匀的聚乙烯-碳纳米管粉末涂料。
(2)将混合均匀的聚乙烯-碳纳米管置于基板上,在样品上盖上一片载玻片后在太阳光下,太阳光强度为670±20勒克斯,用直径为30cm,焦距为20cm的菲涅尔透镜在焦距附近照射粉末,照射时间为2±0.2s时,粉末涂料固化完全,形成聚乙烯膜,固化温度140±5℃。
实施例六:
利用光热效应实现环氧粉末涂料快速固化的方法:
(1)将0.20g环氧树脂粉末与0.04g黑色二氧化钛混合均匀并粉碎,所制得的粉末涂料置于基板上。
(2)在样品上盖上一片载玻片后在太阳光下,太阳光强度为890±10勒克斯,用直径为30cm,焦距为20cm的菲涅尔透镜在焦距附近照射粉末涂料,照射时间为3±0.2s时,粉末固化完全,形成均匀的环氧涂层,固化温度185±5℃。
实施例七:
利用光热效应实现聚酯粉末涂料快速固化的方法:
(1)将2.00g聚酯粉末与0.04g四氧化三铁混合均匀并粉碎,所制得的粉末涂料置于基板上。
(2)在样品上盖上一片载玻片后在太阳光下,太阳光强度为740±20勒克斯,用直径为30cm,焦距为20cm的菲涅尔透镜在焦距附近照射粉末涂料,照射时间为5±0.2s时,粉末固化完全,形成均匀的聚酯涂层,固化温度198±5℃。
实施例八:
利用光热效应实现聚酰亚胺粉末涂料快速固化的方法:
(1)将2.00g聚苯硫醚树脂与0.30g炭黑混合均匀并粉碎,所制得的粉末涂料置于基板上。
(2)太阳光强度为890±20勒克斯,用直径为35cm,焦距37cm的菲涅尔透镜照射粉末涂料,照射时间为5±0.2s时,粉末固化完全,形成均匀的聚苯硫醚涂层,固化温度330±5℃。
本发明公开和提出的利用光热效应实现粉末涂料快速固化的方法,本领域技术人员可通过借鉴本文内容,适当改变条件路线等环节实现,尽管本发明的方法和制备技术已通过较佳实施例子进行了描述,相关技术人员明显能在不脱离本发明内容、精神和范围内对本文所述的方法和技术路线进行改动或重新组合,来实现最终的制备技术。特别需要指出的是,所有相类似的替换和改动对本领域技术人员来说是显而易见的,他们都被视为包括在本发明精神、范围和内容中。
Claims (7)
1.一种利用光热效应实现粉末涂料快速固化的方法,其特征在于包括以下步骤:
1)将光热转换填料与树脂混合均匀并粉碎,然后将粉碎后的粉末涂料均匀置于基板上,所用基板为玻璃、铝片或钢板;
2)选择光源照射粉末涂料,达到固化温度60-330℃,使粉末涂料固化。
2.如权利要求1所述的方法,其特征是所述的光热转换填料含量为树脂用量的0.01-20%。
3.如权利要求1所述的方法,其特征是所述树脂为热塑性树脂或热固性树脂。
4.如权利要求3所述的方法,其特征是所述热塑性树脂包括聚乙烯、聚丙烯、聚酯树脂、聚氯乙烯、聚苯硫醚树脂、聚酰胺、乙烯-乙酸乙烯共聚物或醋酸丁酸纤维素聚氟乙烯。
5.如权利要求3所述的方法,其特征是所述热固性树脂为双酚A型环氧树脂,其固化剂为二羧酸二陷阱、咪唑类、多元羧酸盐、酸酐加成物、酚醛树脂、聚酯树脂或丙烯酸树脂中的一种;聚酯树脂,其固化剂为异氰脲酸三缩水甘油酯、羟烷基酰胺中的一种;羟基聚酯树脂,其固化剂为封闭型异氰酸酯;缩水甘油基丙烯酸树脂,其固化剂为多元羧酸、多元胺、多元酚、多元羟基树脂或聚酯树脂中的一种。
6.如权利要求1所述的方法,其特征是所述光热转换填料为炭黑、碳纳米管、石墨、石墨烯、聚苯胺、硫化铜、四氧化三铁中的任一种或多种。
7.如权利要求1所述的方法,其特征是所述所述的光源为可见光或红外光或太阳光。
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