CN103992445B - 一种弹性体材料及其制成的彩膜基板、液晶面板 - Google Patents

一种弹性体材料及其制成的彩膜基板、液晶面板 Download PDF

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CN103992445B
CN103992445B CN201410200383.7A CN201410200383A CN103992445B CN 103992445 B CN103992445 B CN 103992445B CN 201410200383 A CN201410200383 A CN 201410200383A CN 103992445 B CN103992445 B CN 103992445B
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武晓娟
李娟�
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Beijing BOE Optoelectronics Technology Co Ltd
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Abstract

本发明涉及一种弹性体材料及由其制成的彩膜基板、液晶面板。所述弹性体材料由硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂混合后经紫外辐照聚合而得。所述彩膜基板包括封框胶和像素区，在封框胶和像素区之间设一阻滞圈，所述阻滞圈由硅氧烷侧链液晶弹性体或所述弹性体材料制得。所述液晶面板由阵列基板和所述彩膜基板真空对盒制成。本发明通过在液晶面板的像素区和封框胶之间涂覆一圈具有网络结构的弹性体材料有效防止在对盒过程中液晶对封框胶的冲击作用，从而减少穿刺等不良现象的发生。

Description

一种弹性体材料及其制成的彩膜基板、液晶面板
技术领域
本发明涉及一种弹性体材料及其制成的彩膜基板、液晶面板，属于液晶显示面板制备技术领域。
背景技术
液晶显示面板是通过真空对盒滴有液晶的阵列基板和涂覆有密封胶的彩膜基板制作而成的，这种密封胶就是封框胶。一般液晶显示面板的结构示意图如图1所示。目前市面上的封框胶种类繁多，主要成分有紫外可聚合单体、环氧热聚合单体、环氧丙烯酸树脂、光引发剂、热固化剂、偶联剂、有机填充物、无机填充物、颗粒添加剂等。
常用的封框胶是通过紫外聚合和热聚合分布聚合的方法进行交联的。但在聚合之前，封框胶中的成分大部分为小分子，在彩膜基板和阵列基板对盒过程中，液晶容易对封框胶产生冲击作用，从而引起穿刺等不良现象的发生，如图2所示。目前解决这一问题主要是从对框封胶的材料性能方面进行改进。
CN102643432A公开了一种胆甾相硅氧烷侧链液晶高分子，其具有可逆的胆甾相，较宽的液晶相温度范围，较大的螺旋扭曲力，并可通过调节间隔基中碳链长度、交联剂和液晶单体的接枝摩尔比例调节侧链液晶高分子的性能。但目前为止，未见其在其它领域中应用的相关报道。
发明内容
为了解决液晶对封框胶的冲击问题，本发明提供一种弹性体材料及其制成的彩膜基板、液晶面板。通过对液晶面板结构的改进，可以有效避免液晶接触到封框胶，从而达到防止液晶冲击封框胶的效果，减少穿刺等不良的发生，改善液晶显示面板的质量。
为了实现上述目的，本发明采用如下技术方案：
一种弹性体材料，是由硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂混合后经紫外辐照聚合而得。
所述硅氧烷侧链液晶弹性体为CN102643432A中所公开的液晶弹性体，其结构式如下：
为交联剂单元；
为液晶性单体；
其中，n为3-12的整数，所述交联剂单元与液晶性单体的接枝比例x:y在1:9-9:1之间。
本发明所述硅氧烷侧链液晶弹性体是通过硅氢加成反应将液晶性单体胆固醇衍生物和交联剂联萘二酚衍生物接枝到聚甲基氢硅氧烷上得到的。由于硅氧烷侧链液晶弹性体具有网络结构和液晶性，主链呈链状，粘度较大，交联剂联萘二酚基团呈刚性，可以锚定小分子液晶的排列，从而能够防止基板对盒过程中液晶对封框胶的冲击作用。
所述聚甲基氢硅氧烷结构式如下：
其中，m为4-30的整数。
所述液晶性单体胆固醇衍生物的结构式如下：
其中，n为3-12的整数。
所述交联剂联萘二酚衍生物的结构式如下：
其中，n为3-12的整数。
所述可聚合液晶性单体为1,4-双(4-(6’-丙烯氧基己氧基)苯甲酰氧基)-2-甲苯；其结构式如下：
所述光引发剂为安息香双甲醚，其结构式如下：
其中，所述硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂用量比为79-100:0-20:0-1，优选89-95：5-10：0.25-0.5。
所述弹性体材料可按照本领域常规聚合方法制备而得，具体为将硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂按比例混合均匀，经紫外光辐照聚合形成高分子网络结构的混合物。其中辐照强度5-10mW/cm2，温度20-100℃，时间30-60min；优选温度20-40℃。
本发明还提供一种彩膜基板，包括封框胶和像素区；其中，在封框胶和像素区之间设一阻滞圈，所述阻滞圈由硅氧烷侧链液晶弹性体或权利要求1-5任一所述弹性体材料制得。如图5所示。
所述阻滞圈宽度以50μm-500μm为宜，若阻滞圈宽度小于50μm，则由于阻滞圈较窄，抗冲击能力较弱，对盒过程中液晶分子有可能穿过阻滞圈进入封框胶中；若阻滞圈宽度大于500μm，一方面成本较高，另一方面不利于液晶面板的窄边框设计。所述阻滞圈宽度优选为200μm-400μm。
在本发明中，所述阻滞圈与封框胶和像素区不接触，且保持一定间距。为了避免影响像素区的显示效果，且保证封框胶的粘结效果，本申请中，所述阻滞圈距像素区100-300μm，距封框胶50-200μm。
所述阻滞圈厚度可视液晶面板的盒厚而定，优选为2.0μm-6.0μm。
作为本发明优选的实施方式，所述阻滞圈由弹性体材料制备而得，具体方法为：将硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂混配均匀，避光脱泡处理后，将混合物均匀涂覆到彩膜基板的像素区和封框胶区之间，再经紫外光辐照所得到的。
在彩膜基板的像素区和封框胶之间添加弹性体材料制成的阻滞圈，当彩膜基板和阵列基板真空对盒时，液晶首先冲击到弹性体材料，由于其可以锚定小分子液晶的排列且可以阻止液晶接触到封框胶，从而达到防止液晶冲击封框胶的效果，具体对盒示意图如图3、图4所示。特别是含有由硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂聚合形成的具有高分子网络结构的弹性体材料(图4)，能够进一步固定硅氧烷侧链液晶弹性体的位置，增强其抗冲击力。
本发明还提供一种液晶面板，由阵列基板和上述彩膜基板真空对盒制成。
本发明通过在彩膜基板的像素区和封框胶之间设置一由弹性体材料制成的阻滞圈，通过其锚定小分子液晶的排列，阻止液晶接触到封框胶，从而有效防止在对盒过程中液晶对封框胶的冲击作用，减少穿刺等不良现象的发生。另外由于阻滞圈粘度较大，较易形成阻滞带，且可以精准控制其阻滞圈的宽度，实现普通材料无法达到的技术效果。
附图说明
图1为传统彩膜基板结构示意图。
图2为传统彩膜基板对盒示意图。
图3为本发明所述液晶面板对盒示意图。
图4为本发明所述液晶面板另一对盒示意图。
图5为本发明所述彩膜基板的结构示意图。
图中：1、玻璃基板；2、封框胶；3、液晶；4、硅氧烷侧链液晶弹性体阻滞圈；5、可聚合液晶性单体；6、光引发剂；7、高分子网络。
具体实施方式
以下实施例用于说明本发明，但不用来限制本发明的范围。
实施例1液晶面板的制备
(a)将硅氧烷侧链液晶弹性体经避光脱泡3h后均匀涂覆到彩膜基板的像素区与封胶区之间，形成阻滞圈；其宽度为300μm，厚度为3μm，距封框胶内边缘50μm，距像素区边缘100μm；
(b)将封框胶经避光脱泡2h后均匀涂覆到步骤a)所得的彩膜基板上；
(c)将滴有液晶的阵列基板和步骤b)所得的彩膜基板真空对盒，制成液晶面板。
实施例2液晶面板的制备
按照实施例1的方法制备液晶面板，区别在于，所述阻滞圈宽度为200μm，厚度为4μm；距封框胶内边缘100μm，距像素区边缘150μm。
实施例3液晶面板的制备
按照实施例1的方法制备液晶面板，区别在于，所述阻滞圈宽度为400μm，厚度为2μm；距封框胶内边缘100μm，距像素区边缘100μm。
实施例4液晶面板的制备
(a)弹性体材料及阻滞圈的制备
将硅氧烷侧链液晶弹性体、液晶性可聚合单体、光引发剂按照质量比(94.75:5:0.25)混配均匀，避光脱泡处理3h后均匀涂覆到彩膜基板的像素区和封框胶区之间；其宽度为300μm，厚度为3μm；距封框胶内边缘50μm，距像素区边缘100μm；
将上述彩膜基板经紫外辐照使液晶性可聚合单体发生交联反应形成弹性体材料，即为阻滞圈；其中辐照强度5mW/cm2，温度25℃，时间40min。
(b)将封框胶经避光脱泡2h后均匀涂覆到设有阻滞圈的彩膜基板上；
(c)将滴有液晶的阵列基板和步骤b)所得彩膜基板真空对盒，制作液晶面板。
实施例5液晶面板的制备
按照实施例4所述方法制备液晶面板，区别在于，硅氧烷侧链液晶弹性体、液晶性可聚合单体、光引发剂按照质量比为89.5:10:0.5混配均匀；所得阻滞圈宽度为200μm，厚度为4μm；距封框胶内边缘100μm，距像素区边缘150μm。其中辐照强度10mW/cm2，温度40℃，时间30min。
实施例6液晶面板的制备
按照实施例4所述方法制备液晶面板，区别在于，硅氧烷侧链液晶弹性体、液晶性可聚合单体、光引发剂按照质量比为91.6:8:0.4混配均匀；所得阻滞圈宽度为400μm，厚度为2μm；距封框胶内边缘100μm，距像素区边缘100μm。其中辐照强度5mW/cm2，温度30℃，时间50min。
穿刺对比试验
将实施例1-6得到的液晶面板与现有不加阻滞圈的液晶面板(对比例1)作穿刺对比试验，观察穿刺程度，结果如表1所示。
表1穿刺对比试验
由表1可知，由于实施例1-6所述液晶面板中设有阻滞圈，可以避免液晶穿刺现象；而没有阻滞圈的对比例1液晶面板在对盒过程中，液晶对封框胶的冲击程度较大，冲击宽度为0.15mm。而且，从表1中可看出，实施例4-6的防冲击效果明显优于实施例1-3，由此可见，由硅氧烷侧链液晶弹性体、液晶性可聚合单体、光引发剂形成的弹性体材料的阻滞圈，可以进一步提高液晶面板的抗冲击能力。
虽然，上文中已经用一般性说明及具体实施方案对本发明作了详尽的描述，但在本发明基础上，可以对之作一些修改或改进，这对本领域技术人员而言是显而易见的。因此，在不偏离本发明精神的基础上所做的这些修改或改进，均属于本发明要求保护的范围。

Claims (10)

1.一种彩膜基板，包括封框胶和像素区，其特征在于，在封框胶和像素区之间设一阻滞圈，所述阻滞圈由硅氧烷侧链液晶弹性体或弹性体材料制得；所述弹性体材料由硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂混合后经紫外辐照聚合而得；
所述硅氧烷侧链液晶弹性体是通过硅氢加成反应将液晶性单体胆固醇衍生物和交联剂联萘二酚衍生物接枝到聚甲基氢硅氧烷上得到的；
所述阻滞圈宽度为50μm-500μm。
2.根据权利要求1所述的彩膜基板，其特征在于，所述硅氧烷侧链液晶弹性体的结构式如下：
为交联剂单元；
为液晶性单体；
其中，n为3-12的整数，所述交联剂单元与液晶性单体的接枝比例x:y在1:9-9:1之间。
3.根据权利要求1所述的彩膜基板，其特征在于，所述可聚合液晶性单体为1,4-双(4-(6’-丙烯氧基己氧基)苯甲酰氧基)-2-甲苯。
4.根据权利要求1所述的彩膜基板，其特征在于，所述光引发剂为安息香双甲醚。
5.根据权利要求1所述的彩膜基板，其特征在于，所述硅氧烷侧链液晶弹性体与可聚合液晶性单体、光引发剂用量比为79-100:0-20:0-1。
6.根据权利要求1～5任意一项所述的彩膜基板，其特征在于，所述阻滞圈宽度50μm-500μm。
7.根据权利要求1～5任意一项所述的彩膜基板，其特征在于，所述阻滞圈与封框胶和像素区不接触，且保持一定间距。
8.根据权利要求7所述的彩膜基板，其特征在于，所述阻滞圈距像素区100-300μm，距封框胶50-200μm。
9.根据权利要求1～5任意一项所述的彩膜基板，其特征在于，所述阻滞圈厚度为2.0μm-6.0μm。
10.一种液晶面板，其特征在于，由阵列基板和权利要求1～9任一所述的彩膜基板真空对盒制成。
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