CN104930302B - 隔热防护膜及其应用 - Google Patents
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Abstract
本发明提供了一种隔热防护膜及其应用,所述隔热防护膜,其特征在于:由热致形状记忆聚合物材料制成的基体,在基体表面设有呈阵列排布的表面预变形形貌,所述表面预变形形貌能够在玻璃化转变温度前后在平面与微米或纳米级的凹痕、凸痕、皱褶、孔隙中的一种或多种组成的阵列之间转变。所述的隔热防护膜可用于建筑物、交通运输工具、玻璃的表面。本发明基于材料表面的微米/纳米结构使入射光的传播方式发生改变,增加入射光的衍射而降低透射率。可有效控制隔热防护膜对光的透射率,从而达到随室外温度变化来调节隔热防护膜的遮阳、隔热性能。
Description
技术领域
本发明涉及一种隔热防护膜及其应用。
背景技术
目前,对建筑物或者交通工具等设施实现节能的一种方法是覆盖一层防护膜(如,镀膜、贴膜和涂膜等)。例如,在建筑物的玻璃表面镀一层或多层如铬、钛或不锈钢等金属或其化合物组成的薄膜,对可见光有适当的透射率,对近红外线有较高的反射率,也称为阳光控制玻璃。目前市面上普通的镀膜、贴膜和涂膜不具备随室外温度变化来调节其遮阳、隔热性能的功能。
发明内容
针对现有隔热防护膜的不足,本发明提供了一种随室外温度变化来调节其遮阳、隔热性能的隔热防护膜,用于建筑物、交通工具、玻璃的隔热。
本发明是通过以下技术手段实现上述技术目的的。
一种隔热防护膜,其特征在于:由热致形状记忆聚合物材料制成的基体,在基体表面设有呈阵列排布的表面预变形形貌,所述表面预变形形貌能够在玻璃化转变温度前后对应在平面与微米或纳米级的凹痕、凸痕、皱褶、孔隙中的一种或多种组成的阵列之间进行转变。
优选地,所述热致形状记忆聚合物为双向形状记忆聚合物,所述预变形的变化是可逆的。
优选地,所述双向热致形状记忆聚合物材料的玻璃化转变温度范围为30-80℃。
优选地,所述预变形的加工过程为:加热基体达到或超过玻璃化转变或熔融转变的起始温度,并低于玻璃化转变或熔融转变的终止温度,然后对基体施加外力引起变形,在保持形变的状态下冷却至玻璃化转变或熔融转变的起始温度以下,完成预变形处理。
优选地,所述热致形状记忆聚合物材料为聚乙烯、聚己内酯二醇(PCL)、聚氨酯、聚乙烯-聚己内酯共混物、聚己内酯二醇(PCL)多相共聚酯-氨基甲酸乙酯共聚物、对苯二胺(PPD)的多相共聚酯-氨基甲酸乙酯共聚物、聚己内酯二醇(PCL)-对苯二胺(PPD)多相共聚酯-氨基甲酸乙酯共聚物中的一种或多种。
优选地,所述预变形的尺寸为500微米~50纳米。
所述的隔热防护膜,用于建筑物、交通运输工具、玻璃的表面。
本发明基于材料表面的微米/纳米结构使入射光的传播方式发生改变,增加入射光的衍射而降低透射率。借助热致形状记忆聚合物的形状记忆效应,使基体在预变形温度前后发生可逆的微米/纳米级预变形的形成或消失,这种形状变化伴随颜色或者透明度的改变,可有效控制隔热防护膜对光的透射率,从而达到随室外温度变化来调节隔热防护膜的遮阳、隔热性能。
本发明所述的隔热防护膜制备工艺简单、生产效率高、制造成本低的优势。将本发明所述的隔热防护膜用于建筑物、交通工具、玻璃上,能够对与隔热防护膜所关联的建筑物或者交通设施起到隔热的作用。
附图说明
图1为本发明所述隔热防护膜的局部放大图。
图中:1-预变形,2-基体。
具体实施方式
下面结合附图以及具体实施例对本发明作进一步的说明,但本发明的保护范围并不限于此。以不违背本发明技术方案的前提下,对本发明所作的本领域普通技术人员容易实现的任何改动或改变都将落入本发明的权利要求范围之内。
实施例一:
聚乙烯形状记忆聚合物的玻璃化转变温度为40℃。以尺寸为2m×1m×0.2mm的聚乙烯形状记忆聚合物薄膜为所述隔热防护膜的基体,将聚乙烯形状记忆聚合物薄膜加热到55℃后,在其表面加工出呈阵列排布的纳米孔隙,所述纳米孔隙的直径为200nm、净间隔为100nm,如图1所示,然后在保持形变的状态下冷却,完成预变形处理。把聚乙烯形状记忆聚合物薄膜加热到50℃后,将表面压平使纳米结构消失,再降温至室温。此时隔热防护膜加工完毕。
经过上述方法制备的隔热防护膜,当受热温度达到40℃以上时,隔热防护膜上的纳米结构出现,此时,可见光照射到薄膜上时,由于衍射作用,大部分光线被散失掉,从而使光线产生的热量得以散失。
可将此隔热防护膜与房屋窗户、汽车车身等基体上直接成型,再进行预变形处理加工,从而实现隔热的目的。
实施例二:
隔热防护膜的基体采用热致形状记忆聚合物,具体的,以聚己内酯二醇(PCL)多相共聚酯-氨基甲酸乙酯共聚物为基体材料,基体材料的玻璃化转变温度有两个,分别为25℃和45℃。基体的尺寸为1m×1mm×1mm。将基体加热到50℃后,在其表面通过预变形处理得到呈阵列排布的纳米孔隙,所述孔隙直径约为200nm,净间隔约为200nm。
当温度达到45℃以上时,基体上出现阵列排布的纳米孔隙,基体表面呈现彩虹颜色,此时,可见光照射到薄膜上时,由于衍射作用,大部分光线和热量可被散失掉。当温度降至25℃以下时,薄膜上的纳米结构自动消失,薄膜表面的颜色也消失,此时,薄膜表面光洁,可见光照射时可大部分穿透此薄膜。
可将此薄膜与各类建筑物或者交通运输工具上,从而实现保温隔热的目的。
所述实施例为本发明的具体实施方式,但本发明并不限于上述实施方式,在不背离本发明的实质内容的情况下,本领域技术人员能够做出的任何显而易见的改进、替换或变型均属于本发明的保护范围。
Claims (6)
1.一种隔热防护膜,其特征在于:由热致形状记忆聚合物材料制成的基体,在基体表面设有呈阵列排布的表面预变形形貌,所述表面预变形形貌能够在玻璃化转变温度前后对应在平面与微米或纳米级的凹痕、凸痕、皱褶、孔隙中的一种或多种组成的阵列之间进行转变,所述热致形状记忆聚合物为双向形状记忆聚合物,所述预变形的变化是可逆的。
2.根据权利要求1所述的隔热防护膜,其特征在于:所述双向热致形状记忆聚合物材料的玻璃化转变温度范围为30-80℃。
3.根据权利要求1所述的隔热防护膜,其特征在于:所述预变形的加工过程为:加热基体达到或超过玻璃化转变或熔融转变的起始温度,并低于玻璃化转变或熔融转变的终止温度,然后对基体施加外力引起变形,在保持形变的状态下冷却至玻璃化转变或熔融转变的起始温度以下,完成预变形处理。
4.根据权利要求1所述的隔热防护膜,其特征在于:所述热致形状记忆聚合物材料为聚乙烯、聚氨酯、聚乙烯-聚己内酯共混物、聚己内酯二醇(PCL)、聚己内酯二醇(PCL)多相共聚酯-氨基甲酸乙酯共聚物、对苯二胺(PPD)的多相共聚酯-氨基甲酸乙酯共聚物、聚己内酯二醇(PCL)-对苯二胺(PPD)多相共聚酯-氨基甲酸乙酯共聚物中的一种或多种。
5.根据权利要求1所述的隔热防护膜,其特征在于:所述预变形的尺寸为500微米~50纳米。
6.根据权利要求1~5中任一项所述的隔热防护膜,用于建筑物、交通运输工具、玻璃的表面。
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