CN107097494B - 一种混光效果更好的反射膜及其制备方法 - Google Patents
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Abstract
一种混光效果更好的反射膜,包括具有微泡的芯层,所述芯层的两面均复合有光扩散层;所述的光扩散层由下列组分组成:经偶联剂改性的硅藻土颗粒、光扩散粒子、聚酯。其制备方法为:首先进行芯层料的配料,按照配比将经偶联剂改性的硅藻土颗粒、光扩散粒子、聚酯切片熔融混合挤出造粒,与芯层料在三层挤出夹头挤出流延,再双向拉伸,冷却后形成上述反射膜。本发明使用了具有多孔结构的硅藻土颗粒,利用硅藻土颗粒表面具有孔隙度大、吸收性强、化学性质稳定、耐磨、耐热等特点,能为反射膜的表层提供优异的表面性能,提高表面粗糙度,降低表面光泽度,增加光的反射,散射次数,从而将背光源的光线均匀高效的反射到显示器正面。
Description
技术领域
本发明涉及一种反射膜及其制备方法。
背景技术
如今,科技进步给我们的生活带来了很大的变化。液晶显示设备越来越多,各种各样的液晶显示产品走进我们生活中。从手机到电脑显示器,从掌上电脑到平板电视。无处没有液晶显示技术的身影。液晶是一种介于固态与液态之间的物质,本身是不能发光的,必须要借助背光源才能达到显示的功能。背光源是液晶显示的重要组成,背光源性能的好坏直接影响LCD 显像质量,因此降低背光模组厚度,提高背光显示效果对于降低液晶显示的厚度、成本,提高液晶显示器的显示效果至关重要。
液晶显示器的背光模组主要组成为背光源;导光板(或者扩散板);反射膜、扩散膜、增亮膜等光学膜片等,具有亮度高,寿命长、发光均匀等特点。目前主要有EL、CCFL 及LED 三种背光源类型,依光源分布位置不同则分为侧光式和直下式。
侧光式LED TV的厚度较薄,使用的LED晶粒数量比较少,透过导光板的方式把光送到画面,但是这会造成这种LED TV 的四周边缘画面亮度,比屏幕中央要亮,屏幕的边缘区域会比画面中间的温度高,而直下式是把LED晶粒均匀地配置在液晶面板的后方当作发光源,能够分别设置不同的背光源模块权责区域,让这些区域能够独立调整明暗度,使背光可以均匀传达到整个屏幕,画面细节更细腻逼真。
由于直下式背光源的厚度过大,为了降低厚度,并且有效地混光、混色,不产生光斑(Mura)需要综合考虑光源功率的选择、需求的混光距离、不同光学膜片的选取以及二次透镜光束角度的设计来达到理想的均匀性及合理的亮度值。如何提高反射膜的光学性能,提高反射率,减少光损耗,从而使得从光源发出的光线能被最大程度利用,对于现在直下式超薄背光模组亟待解决的一个重要课题,现有技术中的各种反射膜其光扩散效果都尚待提高。
发明内容
为了克服现有反射膜光扩散率不足的缺点,本发明提供一种混光效果更好的反射膜,并提供其制备方法。
本发明解决其技术问题的技术方案是:一种混光效果更好的反射膜,包括具有微泡的芯层,所述芯层的两面均复合有光扩散层;
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒:5-15质量份;
光扩散粒子:5-15质量份;
聚酯:70-80质量份。
优选的,所述硅藻土颗粒的粒径为5-15μm。
优选的,硅藻土颗粒的改性方法为:硅藻土和偶联剂在无水乙醇或者丁酮中混合,其中偶联剂采用硅烷偶联剂或铝酸酯偶联剂或锆酸酯偶联剂,再采用超声波振荡使偶联剂与硅藻土颗粒充分混合发生偶联反应,从而对硅藻土颗粒进行改性;其中,偶联剂的用量为硅藻土质量的1%-3%。
优选的,所述的光扩散粒子为TiO2粒子或ZnO粒子或ZnS粒子。
优选的,所述光扩散粒子的粒径为3~10μm。
优选的,所述的聚酯为PET。
上述混光效果更好的反射膜的制备方法,首先进行芯层料的配料:在芯层材料切片中均匀混合微米级颗粒状无机成核剂,或者在芯层材料切片内均匀混合化学发泡剂及纳米级颗粒状无机填料;
按照配比将经偶联剂改性的硅藻土颗粒、光扩散粒子、聚酯切片熔融混合挤出造粒,与芯层料在三层挤出夹头挤出流延,再双向拉伸,冷却后形成上述反射膜。
优选的,所述的芯层材料切片为PET切片。
本发明的有益效果在于:使用了具有多孔结构的硅藻土颗粒,利用硅藻土颗粒表面具有孔隙度大、吸收性强、化学性质稳定、耐磨、耐热等特点,能为反射膜的表层提供优异的表面性能,提高表面粗糙度,降低表面光泽度,增加光的反射,散射次数,从而将背光源的光线均匀高效的反射到显示器正面。
附图说明
图1是本发明的反射膜的结构示意图。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细说明。
实施例一
参照图1,一种混光效果更好的反射膜,包括具有微泡1的PET芯层2,所述PET芯层2的两面均复合有光扩散层3。
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒:7质量份;
光扩散粒子:8质量份;
PET:75质量份。
其中,所述硅藻土颗粒4的粒径控制在5-15μm之间(包括5μm和10μm),硅藻土颗粒的改性方法为:硅藻土和偶联剂在无水乙醇或者丁酮中混合,其中偶联剂采用硅烷偶联剂或铝酸酯偶联剂或锆酸酯偶联剂,偶联剂的用量为硅藻土质量的2%,再采用超声波振荡使偶联剂与硅藻土颗粒充分混合发生偶联反应,从而对硅藻土颗粒进行改性,得到改性的硅藻土颗粒。
其中,所述的光扩散粒子5选用TiO2粒子或ZnO粒子或ZnS粒子,所述光扩散粒子的粒径控制在3~10μm之间(包括3μm和10μm)。
实施例二
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒:15质量份;
光扩散粒子:13质量份;
PET:70质量份。
偶联剂的用量为硅藻土质量的2.1%。
其余实施方式与实施例一相同。
实施例三
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒: 5质量份;
光扩散粒子:11质量份;
PET:80质量份。
偶联剂的用量为硅藻土质量的1.5%。
其余实施方式与实施例一相同。
实施例四
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒: 10质量份;
光扩散粒子:15质量份;
PET:76质量份。
偶联剂的用量为硅藻土质量的3%。
其余实施方式与实施例一相同。
实施例五
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒:12质量份;
光扩散粒子:5质量份;
PET:78质量份。
偶联剂的用量为硅藻土质量的1%。
其余实施方式与实施例一相同。
实施例六
所述的光扩散层由下列组分组成:
经偶联剂改性的硅藻土颗粒:13质量份;
光扩散粒子:14质量份;
PET:72质量份。
偶联剂的用量为硅藻土质量的2.5%。
其余实施方式与实施例一相同。
实施例七
上述混光效果更好的反射膜的制备方法,首先进行芯层料的配料:在芯层材料切片(PET切片)中均匀混合微米级颗粒状无机成核剂,在加热过程中围绕所述的微米级颗粒状无机成核剂形成球晶颗粒,再通过拉伸在光学膜片内部的球晶颗粒和非晶体之间被拉开形成所述的微泡。或者在芯层材料切片(PET切片)内均匀混合化学发泡剂及纳米级颗粒状无机填料,所述的化学发泡剂以球形的状态将所述的纳米级颗粒状无机填料包裹,在发泡条件下以所述的纳米级颗粒状无机填料为中心发泡并经过拉伸后形成所述的微泡。这是现有技术中芯层内形成微泡的常用技术手段。
按照配比将经偶联剂改性的硅藻土颗粒、光扩散粒子、聚酯切片熔融混合挤出造粒,与芯层料在三层挤出夹头挤出流延,再双向拉伸,冷却后即形成上述反射膜。
Claims (5)
1.一种混光效果更好的反射膜,包括具有微泡的芯层,其特征在于:所述芯层的两面均复合有光扩散层;所述的光扩散层由下列组分组成:经偶联剂改性的硅藻土颗粒:5-15质量份;光扩散粒子:5-15质量份;聚酯:70-80质量份;
所述硅藻土颗粒的改性方法为:硅藻土和偶联剂在无水乙醇或者丁酮中混合,其中偶联剂采用硅烷偶联剂或铝酸酯偶联剂或锆酸酯偶联剂,再采用超声波振荡使偶联剂与硅藻土颗粒充分混合发生偶联反应,从而对硅藻土颗粒进行改性;其中,偶联剂的用量为硅藻土质量的1%-3%;所述硅藻土颗粒的粒径为5-15μm;所述的光扩散粒子为TiO2粒子或ZnO粒子或ZnS粒子。
2.如权利要求1所述的混光效果更好的反射膜,其特征在于:所述光扩散粒子的粒径为3-10μm。
3.如权利要求1所述的混光效果更好的反射膜,其特征在于:所述的聚酯为PET。
4.如权利要求1所述的混光效果更好的反射膜的制备方法,首先进行芯层料的配料:在芯层材料切片中均匀混合微米级颗粒状无机成核剂,或者在芯层材料切片内均匀混合化学发泡剂及纳米级颗粒状无机填料;其特征在于:按照配比将经偶联剂改性的硅藻土颗粒、光扩散粒子、聚酯切片熔融混合挤出造粒,与芯层料在三层挤出夹头挤出流延,再双向拉伸,冷却后形成上述反射膜。
5.如权利要求4所述的混光效果更好的反射膜的制备方法,其特征在于:所述的芯层材料切片为PET切片。
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