CN115286792B - 一种聚酰亚胺材料及其在液晶取向膜中的应用 - Google Patents
一种聚酰亚胺材料及其在液晶取向膜中的应用 Download PDFInfo
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Abstract
本发明公开了一种聚酰亚胺材料，其原料包括：脂环族二酐单体、二胺单体和1,3,5‑三(2‑三氟甲基‑4‑氨基苯氧基)苯。本发明还公开了上述聚酰亚胺材料在液晶取向膜中的应用。本发明还公开了一种液晶取向膜的制备方法，包括如下步骤：在惰性气体氛围中，取脂环族二酐单体、二胺单体在溶剂中反应，然后加入1,3,5‑三(2‑三氟甲基‑4‑氨基苯氧基)苯继续反应得到聚酰胺酸溶液，将聚酰胺酸溶液涂布在基底表面，亚胺化得到液晶取向膜；其中，液晶取向膜为上述聚酰亚胺材料。本发明可以作为液晶取向膜使用，具有较高的电压保持率和良好的配向性能，避免出现残像的问题。
Description
技术领域
本发明涉及聚酰亚胺技术领域，尤其涉及一种聚酰亚胺材料及其在液晶取向膜中的应用。
背景技术
聚酰亚胺凭借其优异的耐热性和耐化学腐蚀性以及良好的力学性能等优点被广泛用作耐高温塑料、聚合物电解质膜、光刻胶、液晶取向膜、非线性光学材料、分离膜材料、电致变色材料等。在液晶显示器中，液晶取向膜是最重要的部件之一，它能驱使液晶分子按照特定的一个方向取向，绝大部分液晶取向膜都使用聚酰亚胺，因为它比其它材料有着更好的均匀性、稳定性和独特的液晶取向能力。
在液晶产品的使用中，会出现影像残留现象，简称残像，是指液晶受到长时间的驱动，导致显示画面改变后，之前图像痕迹仍可见的现象。残像产生的原因有多种，比如液晶显示元件的电压保持率较低、取向膜的配向性能降低等。残像影响液晶产品的使用，因此需要对其进行改善。
发明内容
基于背景技术存在的技术问题，本发明提出了一种聚酰亚胺材料及其在液晶取向膜中的应用，本发明可以作为液晶取向膜使用，具有较高的电压保持率和良好的配向性能，避免出现残像的问题。
本发明提出了一种聚酰亚胺材料，其原料包括：脂环族二酐单体、二胺单体和1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯。
优选地，脂环族二酐单体、二胺单体和1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯的摩尔比为1:0.95-0.97:0.04-0.05。
优选地，二胺单体为对苯二胺和含有长侧链的二胺单体组成的混合物。
优选地，含有长侧链的二胺单体包括：4,4'-二氨基-4”-十五烷基三苯胺、2,4-二氨基十二烷基苯、2,4-二氨基十六烷基苯中至少一种。
优选地，脂环族二酐单体包括：环丁烷四甲酸二酐、1,2,4,5-环己烷四甲酸二酐、双环[2.2.2]辛-7-烯-2,3,5,6-四羧酸二酐中至少一种。
优选地，对苯二胺和含有长侧链的二胺单体的摩尔比为1:2-3。
调节对苯二胺和含有长侧链的二胺单体的用量，可以进一步提高聚酰亚胺的电压保持率。
本发明还提出了上述聚酰亚胺材料在液晶取向膜中的应用。
本发明还提出了一种液晶取向膜的制备方法，包括如下步骤：在惰性气体氛围中，取脂环族二酐单体、二胺单体在溶剂中反应，然后加入1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续反应得到聚酰胺酸溶液，将聚酰胺酸溶液涂布在基底表面，亚胺化得到液晶取向膜；其中，液晶取向膜为上述聚酰亚胺材料。
优选地，于40-50℃反应8-10h，然后加入1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续保温反应0.5-1h。
优选地，亚胺化的程序为：依次在80-90℃、100-110℃、120-130℃、150-160℃、180-200℃、220-240℃、280-300℃分别保温30-40min。
通选用合适的亚胺化程序，可以使得液晶取向膜在较薄厚度的前提下，仍具有良好的表面状态，进而避免残像出现。
不规定溶剂的种类，能使各原料溶解即可。
有益效果
本发明选用合适种类的二酐单体与适宜种类的二胺单体进行反应，引入了脂环结构，使得聚酰亚胺难以形成分子间和分子内的电荷转移络合物，从而改善其溶解性并使得聚酰亚胺具有较高的电压保持率；另外加入适量的1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯，使得聚酰亚胺保持良好的热稳定性，在200℃摩擦配向时，受热后不易膨胀，保持尺寸稳定性能，进而保持良好的配向性能；另外引入氟元素提高其耐水性、透明性和耐磨性能。
具体实施方式
下面，通过具体实施例对本发明的技术方案进行详细说明，但是应该明确提出这些实施例用于举例说明，但是不解释为限制本发明的范围。
实施例1
一种液晶取向膜的制备方法，包括如下步骤：将3.2mmol对苯二胺、6.7mmol的2,4-二氨基十二烷基苯加入N,N-二甲基乙酰胺混匀溶解，然后通入氮气，排出空气，加入10mmol的1,2,4,5-环己烷四甲酸二酐混匀溶解，调节温度为40℃，搅拌反应10h，然后加入0.4mmol的1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续保温搅拌反应1h得到聚酰胺酸溶液；将聚酰胺酸溶液涂布在基底表面，亚胺化，利用摩擦布对膜进行取向得到液晶取向膜，其中，亚胺化的程序为：依次在80℃、100℃、120℃、150℃、180℃、220℃、280℃分别保温40min。
实施例2
一种液晶取向膜的制备方法，包括如下步骤：将2.4mmol对苯二胺、7.1mmol的4,4'-二氨基-4”-十五烷基三苯胺加入N,N-二甲基乙酰胺混匀溶解，然后通入氮气，排出空气，加入10mmol环丁烷四甲酸二酐混匀溶解，调节温度为50℃，搅拌反应8h，然后加入0.5mmol的1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续保温搅拌反应0.5h得到聚酰胺酸溶液；将聚酰胺酸溶液涂布在基底表面，亚胺化，利用摩擦布对膜进行取向得到液晶取向膜，得到液晶取向膜，其中，亚胺化的程序为：依次在90℃、110℃、130℃、160℃、200℃、240℃、300℃分别保温30min。
实施例3
一种液晶取向膜的制备方法，包括如下步骤：将2.4mmol对苯二胺、7.2mmol的2,4-二氨基十六烷基苯加入N,N-二甲基乙酰胺混匀溶解，然后通入氮气，排出空气，加入10mmol环丁烷四甲酸二酐混匀溶解，调节温度为45℃，搅拌反应9h，然后加入0.45mmol的1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续保温搅拌反应0.8h得到聚酰胺酸溶液；将聚酰胺酸溶液涂布在基底表面，亚胺化，利用摩擦布对膜进行取向得到液晶取向膜，得到液晶取向膜，其中，亚胺化的程序为：依次在85℃、105℃、125℃、155℃、190℃、230℃、290℃分别保温35min。
对比例1
不含1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯，其他同实施例3。
对比例2
将“对苯二胺”替换成“2,4-二氨基十六烷基苯”，其他同实施例3。
对比例3
将“2,4-二氨基十六烷基苯”替换成“对苯二胺”，其他同实施例3。
对比例4
将“2.4mmol对苯二胺、7.2mmol的2,4-二氨基十六烷基苯”，替换成“1.92mmol对苯二胺、7.68mmol的2,4-二氨基十六烷基苯(即对苯二胺和2,4-二氨基十六烷基苯的摩尔比为1:4)”，其他同实施例3。
对比例5
将“环丁烷四甲酸二酐”，替换成“均苯四甲酸酐”，其他同实施例3。
对实施例1-3和对比例1-5制到的液晶取向膜进行性能检测，结果如表1所示。
上述实施例1-3和对比例1-5的基板均为10cm×10cm的ITO玻璃；ITO玻璃在使用前需经过酒精清洗、洗剂超声、清水超声、清水喷淋、气枪干燥、高温干燥和冷却等工序完成玻璃清洗。
分别取实施例1-3和对比例1-5中各两片摩擦取向完成的玻璃，在其中一片玻璃表面分布涂覆封框胶，对位后进行对盒工序，确保上下两片玻璃的摩擦取向方向互相垂直，然后放入150℃烘箱中进行封框胶固化10min；然后液晶注入，确保无气泡后，利用紫外固化封框胶固化时间约为10min进行封口得到液晶显示元件。
用液晶光电测试仪进行电压保持率VHR的测试，检测条件为5V，60μs。
将偏光片粘附在液晶显示元件的上板和下板，使得它们的偏振轴彼此垂直。将此液晶单元粘附在背光源上，使用PR755测量在黑色模式下的亮度记为L0；然后在室温下以5V的AC电压驱动液晶单元24h，关闭电压，测量在黑色模式下的亮度L1；按照公式(L0-L1)/L0*100％计算亮度变化情况，根据亮度变化值评估AC残像的水平，亮度变化值越小，取向稳定性越优异，越不易出现残像。
表1检测结果
由表1可以看出本发明制得的液晶取向膜具有较高的电压保持率，且不易出现残像的问题。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。
Claims (7)
1.一种聚酰亚胺材料，其特征在于，其原料包括：脂环族二酐单体、二胺单体和1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯；
二胺单体为对苯二胺和含有长侧链的二胺单体组成的混合物；
含有长侧链的二胺单体包括：4,4'-二氨基-4”-十五烷基三苯胺、2,4-二氨基十二烷基苯、2,4-二氨基十六烷基苯中至少一种；
对苯二胺和含有长侧链的二胺单体的摩尔比为1:2-3。
2.根据权利要求1所示聚酰亚胺材料，其特征在于，脂环族二酐单体、二胺单体和1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯的摩尔比为1:0.95-0.97:0.04-0.05。
3.根据权利要求1所示聚酰亚胺材料，其特征在于，脂环族二酐单体包括：环丁烷四甲酸二酐、1,2,4,5-环己烷四甲酸二酐、双环[2.2.2]辛-7-烯-2,3,5,6-四羧酸二酐中至少一种。
4.一种如权利要求1-3任一项所述聚酰亚胺材料在液晶取向膜中的应用。
5.一种液晶取向膜的制备方法，其特征在于，包括如下步骤：在惰性气体氛围中，取脂环族二酐单体、二胺单体在溶剂中反应，然后加入1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续反应得到聚酰胺酸溶液，将聚酰胺酸溶液涂布在基底表面，亚胺化得到液晶取向膜；其中，液晶取向膜为如权利要求1-3任一项聚酰亚胺材料。
6.根据权利要求5所示液晶取向膜的制备方法，其特征在于，于40-50℃反应8-10h，然后加入1,3,5-三(2-三氟甲基-4-氨基苯氧基)苯继续保温反应0.5-1h。
7.根据权利要求5或6所示液晶取向膜的制备方法，其特征在于，亚胺化的程序为：依次在80-90℃、100-110℃、120-130℃、150-160℃、180-200℃、220-240℃、280-300℃分别保温30-40min。
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| JPH1039312A (ja) * | 1996-07-24 | 1998-02-13 | Hitachi Chem Co Ltd | 液晶配向膜、これを有する液晶挾持基板及び液晶表示素子並びに液晶配向膜用材料 |
| CN104151823A (zh) * | 2014-09-02 | 2014-11-19 | 长春聚明光电材料有限公司 | 聚酰亚胺薄膜及其制备方法 |
| WO2015182959A1 (ko) * | 2014-05-29 | 2015-12-03 | 주식회사 동진쎄미켐 | 액정 배향제용 디아민 화합물, 액정 배향제, 액정 배향막 및 액정표시소자 |
| CN114479074A (zh) * | 2021-12-29 | 2022-05-13 | 浙江中科玖源新材料有限公司 | 一种耐高温透明聚酰亚胺薄膜及其制备方法、应用 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1039312A (ja) * | 1996-07-24 | 1998-02-13 | Hitachi Chem Co Ltd | 液晶配向膜、これを有する液晶挾持基板及び液晶表示素子並びに液晶配向膜用材料 |
| WO2015182959A1 (ko) * | 2014-05-29 | 2015-12-03 | 주식회사 동진쎄미켐 | 액정 배향제용 디아민 화합물, 액정 배향제, 액정 배향막 및 액정표시소자 |
| CN104151823A (zh) * | 2014-09-02 | 2014-11-19 | 长春聚明光电材料有限公司 | 聚酰亚胺薄膜及其制备方法 |
| CN114479074A (zh) * | 2021-12-29 | 2022-05-13 | 浙江中科玖源新材料有限公司 | 一种耐高温透明聚酰亚胺薄膜及其制备方法、应用 |
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