CN117143419A - 一种量子点扩散板及其制备方法 - Google Patents
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Abstract
本发明涉及一种量子点扩散板及其制备方法,配置含量子点的丝印油墨后在离型膜上丝印、固化继而剥离得到量子点颗粒,继而制得的量子点扩散板中分散有粒径不大于50μm的量子点颗粒,所述量子点颗粒呈棒状或者片状,该量子点颗粒由量子点以及包裹在量子点外的热固化树脂层组成,并且热固化树脂层的外表面具有消光剂形成的不平整的漫反射层。本专利获得规格一致并且便于存储的量子点颗粒,使得量子点材料具有更好的生产适应性,确保量子点在注塑挤压成型过程中免受高温破坏,并且在扩散板中形成均匀的“骨料”结构,显著改善了量子点扩散板脆性大、抗冲击强度低、易开裂等缺点,使得大尺寸的量子点扩散板具有优异的尺寸稳定性。
Description
技术领域
本发明涉及电子材料技术领域,尤其是涉及一种量子点扩散板及其制备方法。
背景技术
量子点显示技术作为最具性价比的广色域显示方案,正在被越来越多的品牌厂商和消费者认可。随着Mini-LED技术的大爆发,三星、TCL、创维、海信等品牌厂商相继推出了搭载量子点技术的Mini-LED产品。其中,量子点方案目前在TV产品的市场占有率上遥遥领先于其他新兴技术,随着技术创新与产业化加快,成本不断下降,有望成为显示标配。但目前由于量子点本身的脆弱性,受到水、高温和湿气的影响较大,需要将其保护。现有技术通常在量子点核结构外生长形成较厚的用于阻隔水氧以及热的壳结构,以适应量子点光学功能板三成共挤工艺中的温度和压力,但是该方式成本较高。
量子点的前述缺陷显然限制了量子点扩散板的生产和应用。另外,量子点光学功能板的强度下降,特别是在高温高湿环境下易发生变形、翘曲问题,也就造成了亮度衰减较大的问题。
发明内容
为解决现有量子点扩散板生产技术所存在的上述至少一个缺陷,本发明提出一种量子点颗粒制备装置及量子点扩散板制备方法,具体由以下技术方案实现:
一种量子点扩散板,所述量子点扩散板中分散有粒径不大于50μm的量子点颗粒,所述量子点颗粒呈棒状或者片状,该量子点颗粒由量子点以及包裹在量子点外的热固化树脂层组成,并且所述热固化树脂层的外表面为利用消光剂形成的不平整的漫反射层。
一种量子点扩散板制备方法,该方法具体包括如下步骤:
S1、将100质量份树脂、10质量份增韧剂、30-40质量份量子点、5-10质量份固化剂及30-40质量份溶剂混合,使用高速分散机以1500-2500rpm的速度进行高速分散、搅拌,使量子点、树脂及增韧剂完全溶解于溶剂中,搅拌均匀得丝印油墨;
S2、在离型膜上将丝印油墨丝印成棒状或者片状结构,对该结构热固化形成贴付在离型膜上的量子点颗粒,速冷后量子点颗粒与离型膜收缩率不同从而发生分离,将其从离型膜上刮除并收集得到粒径不大于50μm的量子点颗粒,将收集到的量子点颗粒加入到含有消光剂的溶剂中,搅拌1-4小时,混匀,干燥; S3、将步骤S2消光后得到量子点颗粒与热塑性基材,光扩散剂,助剂,搅拌形成均匀混料;
S4、将S3混料在挤出机中加热至预定温度后挤出成板材,其中所述量子点颗粒形成位于板材中的骨料。
所述的一种量子点扩散板制备方法,其进一步设计在于,步骤S2所述树脂为橡胶改性环氧树脂。
所述的一种量子点扩散板制备方法,其进一步设计在于,步骤S2所述分散消光剂为金属皂、改性油、硅藻土、气相SiO2中的任意一种;其中的第二溶剂选择氯仿、甲苯、二甲苯中的任意一种;其中量子点颗粒、消光粉、第二溶剂重量比例为1:0.01:0.5。
本发明有益效果在于:
利用量子点颗粒制备装置可以获得规格一致并且便于存储的量子点颗粒,使得量子点材料具有更好的生产适应性,确保量子点在注塑挤压成型过程中免受高温破坏,并且有利于在扩散板中形成均匀的“骨料”结构,显著改善了量子点扩散板脆性大、抗冲击强度低、易开裂等缺点,耐形变性能更佳,使得大尺寸的量子点扩散板具有优异的尺寸稳定性,提供了市场所需的高性能、低成本、便于装配的量子点光学功能板,大幅度降低了显示设备的量产成本。
由于丝印形成的量子点颗粒的粒径不大于50μm,如果利用一般的刮刀或者毛刷,难以从离型膜上充分地将量子点颗粒剥离,以及会对离型膜造成损伤;因此本专利在离型膜以及位于离型膜上的丝印点由于热固化而处于较高温度时,通过冷却机构对离型膜进行降温,离型膜冷却收缩使得丝印点从离型膜上分离从而便于收集得到量子点颗粒。
由于丝印形成的量子点颗粒在固化时,会形成具有全反射效果的表面。通过对量子点颗粒进行消光处理,破坏了表面的全反射,增强光的散射和透射;光线在均匀散布于板材基材中的量子点颗粒中经过多次散射和投射,确保点光源变成面光源,扩大了发光面,降低了光损,并且光线柔和。
附图说明
图1是本发明量子点扩散板结构示意图。
实施方式
以下结合说明书附图以及实施例对本发明进行进一步说明:
具体地,为了制备包含本专利量子点颗粒的扩散板的步骤如下:
如图1所示的一种量子点扩散板,所述量子点扩散板中分散有粒径不大于50μm的量子点颗粒1,所述量子点颗粒1呈棒状或者片状,该量子点颗粒由量子点11以及包裹在量子点外的热固化树脂层12组成,并且所述热固化树脂层的外表面为利用消光剂形成的不平整的漫反射层。
上述量子点扩散板的制备工艺如下:
在制备丝印油墨之前,先对量子点进行改性,利用分散剂对其进行改性,提高其在丝印油墨中的分散度:将CdZnSeS量子点加入到分散剂中, 60℃-90℃下,搅拌完全分散,离心得到经过改性的量子点;其中量子点与分散剂质量比为1:1,分散剂采用阿拉丁试剂产的巯基乙酸乙酯或者德固赛产的全氟辛基三乙氧基硅烷。
将经过改性的量子点与树脂、增韧剂、固化剂及溶剂混合,使用高速分散机以1500-2500rpm的速度进行高速分散、搅拌,使S1改性量子点、树脂、固化剂及增韧剂完全溶解于溶剂中,得混合溶液;继而向其中添加5-10质量份,搅拌均匀,得丝印油墨;其中树脂为橡胶改性环氧树脂。所述增韧剂为热塑性丙烯酸树脂。溶剂采用二乙二醇丁醚或丙二醇苯醚。
也可向丝印油墨中添加流平剂、消泡剂、偶联剂、润湿剂、防沉降剂、紫外线吸收剂,分散、搅拌,使各组分均匀分散;其中,流平剂采用型号为BYK LPG-23687的有机硅流平剂;消泡剂采用型号BYK-1797的有机硅消泡剂或者型号为BYK-057的聚醚改性消泡剂;偶联剂采用型号为道康宁OFS-6040的环氧硅烷偶联剂或者型号为信越803的巯基硅烷偶联剂;润湿剂采用型号为道康宁DC67的有机硅润湿剂或者型号为3M FC-4430的氟碳改性润湿剂;防沉降剂采用型号为BYK-411的聚醚改性防沉降剂或者型号为卡博特M-5的气相二氧化硅防沉降剂;固化剂采用阳型号为日本三新化学SI-100的离子热引发剂或者型号为德固赛ALZCHEM 100S的双氰胺;紫外线吸收剂采用阿拉丁试剂的水杨酯苯酯或者2 ,4-二羟基二苯甲酮。具体用量为:0.3-0.6质量份流平剂、6-10质量份消泡剂、4-6质量份偶联剂、1-2质量份润湿剂、0-1质量份防沉降剂、0-0.5质量份紫外线吸收剂。
利用所述的量子点颗粒制备装置在离型膜上将丝印油墨丝印成棒状或者片状结构,对该结构热固化形成贴付在离型膜上的量子点颗粒,速冷后量子点颗粒与离型膜收缩率不同从而发生分离,将其从离型膜上刮除并收集得到粒径不大于50μm的量子点颗粒,将量子点颗粒加入到含有消光剂的第二溶剂中,搅拌1-4小时,混匀,干燥。所述分散消光剂为金属皂、改性油、硅藻土、气相SiO2中的任意一种;其中的第二溶剂选择氯仿、甲苯、二甲苯中的任意一种;其中量子点颗粒、消光粉、第二溶剂重量比例为1:0.01:0.5。
将经过消光处理的量子点颗粒与热塑性基材,光扩散剂,助剂,搅拌形成均匀混料;混料在挤出机中加热至预定温度后挤出成板材。
实施例1:
将巯基乙酸乙酯10g加入到量子点CdZnSeS(自制)正己烷分散液(量子点含量10%)100g中,60℃搅拌4小时,离心得到改性量子点;油墨还包括以下重量份的组分:橡胶改性环氧树脂50g、饱和聚酯树脂5g、量子点20g、二乙二醇丁醚20g、有机硅流平剂0 .3g、有机硅消泡剂3g、环氧硅烷偶联剂3g、有机硅润湿剂0 .5g、聚醚改性防沉降剂0 .2g、阳离子热引发剂5g、水杨脂苯酯0 .2g。采用丝网印刷工艺(丝印网板目数420,张力22 .5N/m),将油墨进行印刷,印刷棒状结构20um*80um,以180℃x1min进行烘烤固化,固化之后速冷继而剥离得到量子点颗粒。剥离之后将量子点颗粒、消光粉、氯仿按重量比例1:0.01:0.5混合搅拌6小时,干燥。
实施例2:
将全氟辛基三乙氧基硅烷10g加入到量子点CdZnSeS(自制)正己烷分散液(量子点含量10%)100g中,90℃搅拌4小时,离心得到改性量子点;油墨还包括以下重量份的组分:双酚A型环氧树脂30g、热塑性丙烯酸树脂3g、量子点10g、丙二醇苯醚10g、有机硅流平剂0.1g、聚醚改性消泡剂3g、巯基硅烷偶联剂1 .5g、氟碳改性润湿剂0 .5g、气相二氧化硅防沉降剂0 .2g、双氰胺3g、2 ,4-二羟基二苯甲酮0 .1g。采用丝网印刷工艺(丝网目数420,张力22 .5N/m),将油墨进行印刷,印刷直径50um的圆形片状结构, 180℃x1min进行烘烤固化,固化之后速冷继而剥离。剥离之后将量子点晶颗粒、消光粉、氯仿按重量比例1:0.01:0.5混合搅拌6小时,干燥。
实施例1和实施例2制得的经过消光处理的量子点颗粒、热塑性基材以及光扩散剂和助剂根据扩散板现有技术一般配比(其中量子点颗粒的质量份根据量子点计算)搅拌形成混料,在挤出机中加热至预定温度后挤出成量子点扩散板。其中,作为热塑性基材的树脂:江苏赛宝龙公司提供的GPPS,或者日本三菱丽阳公司提供的PMMA;以及光扩散剂为信越公司提供的有机硅光扩散剂KMP-590;以及助剂:抗氧剂采用巴斯夫提供的Irganox抗氧剂1010受阻酚类抗氧化剂;以及光稳定剂采用巴斯夫提供的Chimassorb 944。
将量子点扩散板在60℃、90%RH湿度条件下,放置1000h,检测放置前后的亮度值,计算得到亮度衰减率,亮度衰减=(老化前的亮度值-老化后的亮度值)/老化前的亮度值*100%;亮度检测方法:将量子点扩散板置于蓝光背光模组下,用色彩分析仪进行测试中心点亮度,电流固定400A,电压固定42V。
亮度均匀性检测方法:将显示屏等分为若干个区域,分别对每一个区域进行白色亮度测试;记录每个区域的亮度,获取量子点扩散板亮度最小值(L1)和亮度最大值(L2),并计算L1和L2的比值(L1/L2)的百分数,比值越大,说明量子点扩散板的发光均一性越好。
利用实施例1和实施例2的量子点颗粒制得的量子点扩散板的亮度均匀性保持在70%以上,亮度衰减低于3.06%,板面未发生翘曲;而直接向扩散板基材中添加量子点则同等条件下亮度衰减超过50%,并且相应的扩散板平放时宽度方向一侧边沿已经因翘曲明显脱离平台;以及,本专利的量子点颗粒未采用消光剂的情况下,扩散板亮度均匀性不高于65%。
Claims (5)
1.一种量子点扩散板,其特征在于,所述量子点扩散板中分散有粒径不大于50μm的量子点颗粒,所述量子点颗粒呈棒状或者片状,该量子点颗粒由量子点以及包裹在量子点外的热固化树脂层组成,并且所述热固化树脂层的外表面具有消光剂形成的不平整的漫反射层。
2.一种量子点扩散板制备方法,其特征在于该方法具体包括如下步骤:
S1、将100质量份树脂、10质量份增韧剂、30-40质量份量子点、5-10质量份固化剂及30-40质量份第一溶剂混合,经分散、搅拌,使量子点、树脂及增韧剂完全溶解于第一溶剂中,得丝印油墨;所述树脂为橡胶改性环氧树脂;所述增韧剂为热塑性丙烯酸树脂;第一溶剂采用二乙二醇丁醚或丙二醇苯醚;
S2、在离型膜上将丝印油墨丝印成棒状或者片状结构,对该结构热固化形成贴付在离型膜上的量子点颗粒,速冷后量子点颗粒与离型膜收缩率不同从而发生分离,将其从离型膜上刮除并收集得到粒径不大于50μm的量子点颗粒,将收集到的量子点颗粒加入到含有消光剂的第二溶剂中,搅拌混匀,干燥,得到经过消光处理的量子点颗粒;
S3、将步骤S2消光后得到量子点颗粒与热塑性基材,光扩散剂,助剂,搅拌形成均匀混料;
S4、将S3混料在挤出机中加热至预定温度后挤出成板材,其中所述量子点颗粒形成位于板材中的骨料。
3.根据权利要求2所述的量子点扩散板制备方法,其特征在于,步骤S1所述树脂为橡胶改性环氧树脂。
4.根据权利要求3所述的量子点扩散板制备方法,其特征在于,步骤S2中,所述分散消光剂为金属皂、改性油、硅藻土、气相SiO2中的任意一种;所述第二溶剂选择氯仿、甲苯、二甲苯中的任意一种。
5.根据权利要求4所述的量子点扩散板制备方法,其特征在于,步骤S2中量子点颗粒、消光粉、第二溶剂重量比例为1:0.01:0.5。
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