CN1211587A - 具有表面涂层的车辆用树脂成形品 - Google Patents

具有表面涂层的车辆用树脂成形品 Download PDF

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CN1211587A
CN1211587A CN98118880A CN98118880A CN1211587A CN 1211587 A CN1211587 A CN 1211587A CN 98118880 A CN98118880 A CN 98118880A CN 98118880 A CN98118880 A CN 98118880A CN 1211587 A CN1211587 A CN 1211587A
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相川信治
中村浩一
间部三千广
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Abstract

一种具有表面涂层的车辆用成形品,在树脂制基体表面上形成镀层,该镀层表面具有用涂料涂敷而成的涂层膜,该涂层膜由含有UV吸收剂的、多层不同的硅系涂层膜层叠而成。下层形成反射光的珍珠色膜,上层形成所需颜色的膜。由各涂层膜中的UV吸收剂吸收UV光,故到达镀层与涂层膜界面的UV光减少,有效地防止涂层膜脱落。下层涂层膜形成反光膜,有效地对外部光进行反射,呈现出具有光泽感的外观,金属色涂层可增加外观的美感。

Description

具有表面涂层的车辆 用树脂成形品
本发明涉及车辆的灯具及显示器等的一部分所使用的树脂成形品,特别是涉及其表面经过涂层处理的车辆用树脂成形品。
例如,汽车用的灯具是将电灯泡和灯前玻璃组装在树脂成形的灯体上构成的,在灯体上涂上所需要的颜色,使该灯体的颜色与汽车车体的颜色相协调。在这种情况下,当汽车的车体为所谓金属色时,灯体的涂层也要与其相协调而涂金属色。图4(a)是表示现有的这种金属色涂层的断面构造图,在由树脂成形后的树脂部件构成的基体200的表面上,用例如电镀方法形成镀层201,然后再在该镀层201的表面上涂一层所需要颜色的涂料而形成涂层膜202。这样,通过形成一层镀层膜201,把它作为涂层202的基层,则从外面照射的光透过涂层膜202之后,由镀层201反射,然后再透过涂层膜202反射到外部,因此便呈现出具有光泽的金属色外观。
这种现有涂层结构存在着下述问题,由于是用氨酯系涂料作为涂层膜202的涂料,故UV光(紫外线光)的透过率比较高,从外部照射的光中的UV光便透过涂层膜202到达镀层201,使镀层201的表面劣化,使其反射率下降,同时使与镀层交界的界面上的涂层膜202劣化,致使涂层膜与镀层201的粘附性降低,使涂层膜202剥离。因此,人们将涂层膜202涂得厚厚的,但这样会使涂层膜202的透过可视光的透过率降低,故镀层201反射的光难以射到外部,不能获得因得到作为目的的金属色而呈现的光泽感。此外,如后述,当基体上具有突部时,如果该突部的边缘部是角形的,该边缘部的涂膜便容易变薄,故在该边缘上所述涂层膜的剥离现象很明显。
因此,如图4(b)所示,以往人们考虑在基体300上形成镀层301,然后再用含有UV吸收剂的涂料在其表面上涂一层涂层膜302,通过该涂层膜302减少到达镀层301的UV光。这种涂层膜结构存在着下述问题,即,虽然可以有效地减少到达镀层301的UV光,但当涂层膜302的厚度比较薄时,就难以有效地防止涂层剥离,当涂层膜302增厚时,又会影响光泽感,很难将所述问题解决到令人十分满意的程度。
本发明的目的在于提供一种具有表面涂层的车辆用树脂成形品,这种树脂成形品不仅可以有效地防止镀层劣化和涂层膜剥离,而且还可获得充分的光泽感。
本发明的车辆用树脂成形品,在树脂制成的基体表面上形成一层镀层,在该镀层上具有涂以涂料而成的涂层膜,这种车辆用树脂成型品的所述涂层膜是由含有UV吸收剂的多层不同的硅系涂料涂成层叠状的涂层膜构成的。在这里,多层硅系涂层膜是由两层构成的,其中下层的涂层膜是由具有光反射功能的涂层膜构成的。在这种情况下,设置在所述基体表面上的突部的边缘部最好形成曲面。
图1是将本发明用于车辆用灯具的实施例之部分分解斜视图;
图2(a)是沿图1的AA线剖开的断面图,图2(b)是图2(a)重要部分的放大图;
图3(a)表示本发明突部之断面构造的断面图,图3(b)表示现有的突部之断面构造的断面图;
图4(a)、图4(b)是现有涂层构造之断面图。
下面参照附图说明本发明的实施例。图1是将本发明用于汽车尾灯的实施例之部分分解斜视图。灯体1是通过ABS树脂成形而形成的前面设有开口部11的容器状构件,在其背面设有灯泡安装孔12,在该孔内嵌装有支承作为光源的电灯泡2的灯座3。此外,在前面开口部11上嵌有灯前玻璃4,设在该灯前玻璃4周围的密封脚41插在沿着所述灯体1的前面开口部11的周缘形成的密封槽13内,并且用未图示的密封剂固定。又,在所述灯体1的前面开口部11的上边部到侧边部上设有罩部14,当灯具已经安装在汽车车体(未图示)上时,所述罩部将车体与灯体1之间的间隙遮住,使外观更美。
此外,在灯体1的包括所述罩部14的表面涂有金属色。图2(a)是表示沿图1的AA线的所述罩部14的断面构造之断面图,图2(b)是其B部的放大图。在树脂成形的灯体1即基体100的表面上,利用非电镀法形成例如铬等金属镀层101。在这种情况下,由于该镀层101是以所述灯体1的内面作为反射镜而构成的,故在镀铬时可以与之同时形成,而且灯体1的材料是采用ABS树脂,所以与镀层的附着性也非常好。此外,这时如图3(a)所示,在所述罩部14的图2(a)的C部位置上形成有突部14a,当该突部具有边缘部14b时,由于边缘部14b带有圆角,所以在进行所述树脂成形时边缘部14b的断面形状成为曲面。为了使该边缘部14b形成曲面,只要使树脂成形用的模具的边缘部形成曲面状即可。
在所述镀层101的表面形成第一涂层膜102,它是用含有UV吸收剂的丙烯硅酮系涂料涂上的,此外还在该第一涂层膜102的表面上形成有第二涂层膜103,该第二涂层膜也同样是用含有UV吸收剂的丙烯硅酮系涂料涂成的。在这里,所述第一涂层膜102是由对光进行漫反射的所谓珍珠色涂层膜构成的。这种所谓珍珠色涂层膜是在透明的涂料中混入金属微粉末或微粒子等而形成的,这些微粉末或微粒子上附有铝等的银色。又,所述第二涂层膜103是由有色涂层膜构成的,该涂层膜含有所希望的色彩,这里是含有与汽车车体颜色相同的红色色素。而且,所述第一涂层膜102的厚度和第二涂层膜103的厚度之和与所述现有涂层膜的厚度相等或比它厚。
采用这种涂层结构,外部的光从第二及第一涂层膜103、102进入涂层膜内部,通过这些涂层膜到达镀层101时,UV光被第二及第一涂层膜103、102所含的UV吸收剂吸收,因此到达镀层101与第一涂层膜102的界面的UV光减少了。特别是第二及第一涂层膜103和102的总厚度形成得比现有的涂层膜还要厚,故吸收UV光的量增大,结果可以有效地防止镀层101与第一涂层膜102界面上的UV光引起的涂料劣化及涂层膜剥离。又因第一涂层膜102是由能反射光的珍珠涂料膜构成的,所以进入到第一涂层膜102表面的光的一部分被第一涂层膜102反射,故到达与镀层101交界的界面上的光进一步减少,更有效地防止了第一涂层膜102剥离。
此外,即使第一及第二涂层膜102、103的合计厚度形成得比现有涂层膜的还要厚,第一涂层膜102是珍珠涂层膜,如上所述,对从外部射入的光的一部分进行反射,所以第一涂层膜102反射的不仅是UV光,而且对可视光也进行反射,并透过第二涂层膜103射向外部。因此,镀层101的反射光和来自第一涂层膜102的反射光各自合成一体向涂层面外部射出,从外部看涂层面时,是第二涂层膜103的色彩,而且显露出具有光泽感的外观,金属色的涂层使其外观更美。此外,其下层使用的珍珠涂层膜,利用该珍珠涂层膜对内部应力的缓和作用,使涂层膜与镀层面的附着力增强。
此外,在该实施例中,由于设在罩部14上的突部14a的边缘部14b带有圆角,因此,如图3(a)所示,对边缘部14b也可以接近均匀的膜厚,涂饰形成第一及第二涂层膜102、103。顺便说一下,若如以往那样边缘部是角状的,则如图3(b)所示,涂饰形成的涂层膜102'、103'的边缘部14b上的膜厚度变薄,该膜厚较薄的部分受UV光的照射而显著劣化,这部分的膜剥离现象明显。
这里,将本发明的涂层结构与现有的涂层结构进行比较试验的结果列于表1。在该表中,还显示有现有的涂层结构即如图4(a)所示的不含UV吸收剂的氨脂系涂料形成的涂层膜例(比较例1)、以及图4(b)所示的含UV吸收剂的丙烯硅酮系涂料形成的涂层膜例(比较例2)。从该表可以看出,在比较例1的情况下,当膜厚达40μm左右时,虽然涂层膜剥离现象可以得到一定程度的控制,但不能充分防止剥离现象的发生,而且失去了光泽感,因此难以在实际中采用。在比较例2的情况下,膜厚约20μm,虽然取得了抑制涂层膜剥离的效果,但完全失去了光泽感,同样难以在实际中应用。而本发明的涂层结构,在第二涂层膜的厚度小于10μm、或第一涂层膜的厚度为5μm的情况下,涂层膜的剥离极少,当膜厚形成得比所述的厚度厚时,基本可防止涂层膜剥离。此外,即使像这样第一和第二涂层膜的合计厚度超过20μm,也可获得光泽感,完全可以应用于实际。又,由于涂层膜的总厚度超过20μm,故还可以防止镀层生锈,可提高镀层的耐大气腐蚀性。
此外,在所述实施例中是采用丙烯硅酮系涂料,其他涂料例如可用聚酯硅酮、硅酮变性醇酸、硅酮变性氨酯系等。又,所述UV吸收剂可采用大家熟知的产品,例如二苯甲酮系、苯并三唑、水杨酸苯脂系等吸收剂。另外,第一涂层膜只要是具有光反射作用的涂层膜,则不一定非要采用所述珍珠色的涂层膜。
此外,所述实施例是将本发明用于汽车前照灯的例子,但同样可用于除此以外的灯具的灯体。又,除了灯具之外的车辆用的树脂成形品例如显示器、装饰用品等也同样可以采用。
如上所述,本发明在树脂制成的基体表面上形成镀层,并在该镀层的表面上涂敷涂料而形成涂层膜,而且,由于这种涂层膜是由含有UV吸收剂的多层不同的硅系涂敷膜涂敷成层叠状态的涂层膜构成的,故通过多层涂层膜各自所含的UV吸收剂吸收UV光之后,到达镀层与涂层的界面上的UV光就减少了,于是可以防止镀层劣化,同时,有效地防止涂层膜剥落。又因下层的涂层膜是作为反射光的膜而形成的,故可通过该下层涂层膜有效地对外部光进行反射,即使在涂层膜的厚度设计得很厚的情况下,也能显露出上层涂层膜的色彩、而且呈现具有光泽感的外观,金属色涂层可使其外观更美。此外,下层所使用的珍珠色涂层膜具有能缓解其内部应力的功能,故可增强涂层膜与镀层面之间的附着力。又因为突部的边缘部是曲面状的,所以边缘部的涂膜厚度不会有局部减薄现象,可防止该边缘部的涂层膜剥离。
表1
涂层膜厚度(μm) UV透过率(%) 膜剥离(处) 光泽(肉眼检查)
本发明含有UV吸收剂的丙烯硅酮2层 珍珠色 红色
    555510101010     51015205101520     31.50.150.075210.10.05     少少无无少无无无     ◎◎○○◎◎○○
比较例1氨脂系1层     710152140     50301851.2     多多中中中     ◎◎◎○△
比较例2含有UV吸收剂的丙烯硅1层     5101520     5320.1     多多中少     ◎◎○△

Claims (3)

1.一种具有表面涂层的车辆用树脂成形品,包括:经过成形的树脂制基体、在该基体的表面上形成的镀层、以及用涂料在该镀层的表面上涂敷而成的涂层膜;其特征在于:所述涂层膜是由含有UV吸收剂的多种不同的硅系涂料涂敷成层叠状态的多层涂层膜构成的。
2.如权利要求1所述的具有表面涂层的车辆用树脂成形品,其特征在于:所述多层涂层膜是由下层涂层膜和上层涂层膜两层构成的,其中下层涂层膜是由具有光反射功能的涂层膜构成的。
3.如权利要求1或2所述的具有表面涂层的车辆用树脂成形品,其特征在于所述基体表面上形成有突部,该突部的边缘部呈曲面状。
CN98118880A 1997-09-12 1998-09-07 具有表面涂层的车辆用树脂成形品 Expired - Fee Related CN1077904C (zh)

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JP248083/97 1997-09-12
JP248083/1997 1997-09-12
JP09248083A JP3104866B2 (ja) 1997-09-12 1997-09-12 表面塗装された車両用樹脂成形品

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JPH1178673A (ja) 1999-03-23
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KR100298375B1 (ko) 2001-08-07
US6190028B1 (en) 2001-02-20
KR19990029716A (ko) 1999-04-26

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