CN109423299A - 一种聚合物分散液晶材料及其制作方法 - Google Patents
一种聚合物分散液晶材料及其制作方法 Download PDFInfo
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- C08F216/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
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- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
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Abstract
本发明提供了一种聚合物分散液晶材料及其制作方法,该材料以重量计包括以下组份:胆甾相液晶(40‑85%),光固化单体(7%‑59.75%),光引发剂(0.05‑1%),间隔粒子(0.05‑1%),溶剂(0.1‑5%),偶联剂(0.05‑1%)。还公开了该材料的制作方法。本发明可以感应压力产生笔迹,实现手写功能,该笔迹无需持续供电维持,施加电场即可清除,具备高亮度,高对比度、笔迹粗细适中等特点,可用作手写膜,用于液晶手写板行业,在写字绘画教学等领域有巨大的应用空间。
Description
技术领域
本发明属于显示材料,具体的说涉及一种双稳态液晶手写膜材料及其制作方法。
背景技术
在液晶显示领域,基于胆甾相双稳态液晶的可手写功能和不需持续供电维持显示的节能特性,在手写板领域得到了更多更广泛的应用。
显示用胆甾相液晶具有两个稳态,FC态和P态,受压时变成P态,此时可反射固定波长关系,外观表现为显示笔迹,施加电场后,P态变回FC态,表现为透明状态,笔迹被清除。
如果将液晶和聚合物一起混合溶解,再通过加热固化或者紫外光固化,使聚合物开始聚合成网格,液晶析出,成液滴分布在聚合物网格中间,此时液晶仍保留大部分原有性质,这种材料一般就称作聚合物分散液晶材料,简称PDLC,主要用作调光膜。
显示用胆甾相液晶材料一般由向列相液晶和手性剂配制而成,对入射光具有选择性反射,对于多色低功耗反射式液晶显示而言,只有当入射光的旋光性与胆甾相液晶层一致且波长满足Bragge公式时才被反射,即入射光的波长λ与液晶材料的螺距P及平均折射率成正比:
胆甾相液晶材料的螺距P和手性剂浓度Xc的关系是:
其中HTP是手性剂的扭曲力常数,可以通过调节不同HTP值得手性组份及其在液晶材料的含量来改变螺距和反射波长。
近年来,人们结合聚合物分散液晶相关工艺和技术(PDLC),制作了调光膜,使之通电透明,断电磨砂雾状,但透明状态需要通电维持。胆甾相液晶具有双稳态,也可以按照调光膜的制作模式,采用聚合物混合胆甾相液晶固化的方式,得到具备双稳态的聚合物分散液晶材料,可手写显示,字迹通电可清除,可用作手写膜。
发明内容
本发明的目的在于克服目前双稳态液晶手写膜普遍存在的细笔记不亮,亮笔迹太粗的矛盾问题,以及对比度低,驱动电压高、附着力低等技术难题,采用不使用低聚物、只使用光固化单体的思路,即可得到粗细适中,超高亮度的液晶手写膜。
本发明的目的可以通过以下措施达到:
该种聚合物分散液晶材料,其特征在于:所述聚合物分散液晶材料以重量计包括以下组份:胆甾相液晶(40-85%),光固化单体(7%-59.75%),光引发剂(0.05-1%),间隔粒子(0.05-1%),溶剂(0.1-5%),偶联剂(0.05-1%)。
所述胆甾相液晶的双折射率Δn≥0.16。
所述光固化单体为乙烯基类单体、乙烯基醚类单体、甲基丙烯酸酯类单体、丙烯酸酯类单体中的一种或几种。
进一步的,所述光固化单体为单官乙烯基类单体、单官乙烯基醚类单体、双官乙烯基醚类单体,单官丙烯酸酯类单体,单官甲基丙烯酸酯类单体、双官丙烯酸酯类单体,双官甲基丙烯酸酯类单体、三官丙烯酸酯类单体,三官甲基丙烯酸酯类单体中的一种或几种。
所述光引发剂为4-(苯硫基)苯基二苯基硫鎓六氟磷酸盐、4-异丁基苯基-4′-甲基苯基碘鎓六氟磷酸盐,2,4,6-三甲基苯甲酰基-二苯基氧化膦,2,4,6-三甲基苯甲酰基苯基膦酸乙酯、2-甲基-1-(4-甲硫基苯基)-2-吗啉-1-丙酮、2-羟基-2-甲基-1-苯基丙酮中的一种或几种。
所述间隔粒子直径为3-5μm。
所述溶剂为正戊烷,环己烷,正庚烷,甲苯,二甲苯,乙酸乙酯,乙醇中的一种或几种。
所述偶联剂为γ-氨丙基三乙氧基硅烷,γ-缩水甘油醚氧丙基三甲氧基硅烷,γ-(甲基丙烯酰氧)丙基三甲氧基硅烷中的一种或几种。
本发明还提供了一种聚合物分散液晶材料的制作方法,包括如下步骤:
(1)选取两片导电膜作为基材,表面方阻为100-1000Ω。
(2)制胆甾相液晶:取向列型液晶和手性剂在80℃下混合搅拌2小时,得到胆甾相液晶;
(3)室温避光环境下将胆甾相液晶,光固化单体,光引发剂,间隔粒子,溶剂,偶联剂混合到一起,搅拌2h以上,得到混合物A。
(4)将混合物A均匀涂布到两片导电膜中间,经紫外光照射固化,照度为0.1-10mW/m2,固化时间0.5-10min,即得到所述材料。
(5)在导电膜上书写,所述材料受压即可显示字迹;在两片导电膜上施加10-40V交流电,字迹清除,具有双稳态,可用作手写膜使用。
本发明与传统技术相比具有以下优点:
(1)本发明所述的聚合物分散液晶材料不含低聚物,在经过固化后,可以充分保证液晶的析出,光固化单体可形成均一规则的网格,当有低聚物存在时,低聚物会干扰网格的形成,网格不均匀。
(2)本发明所述的聚合物分散液晶材料含乙烯基类单体、乙烯基醚类单体,在经过光固化时,反应速度相对较慢,可以有充足时间让液晶析出,从而使聚合物网格更规则。
综合以上几点,本发明所述的聚合物分散液晶材料及其制作方法,可以得到粗细合适,极高高度的手写膜。
附图说明
图1为本发明的SEM扫描电镜图。
具体实施方式
为了使本发明的内容更容易的理解,下面根据本发明的具体实施例并参阅图1所示,对本发明做进一步详述:
实施例1:
本实施例提供了一种聚合物分散液晶材料,所述聚合物分散液晶材以重量计包括以下组份:胆甾相液晶(78%),光固化单体(20%),光引发剂(0.4%),间隔粒子(0.5%),溶剂(1%),偶联剂(0.1%)。
所述胆甾相液晶的双折射率Δn≥0.16。
所述光固化单体包括4-羟丁基乙烯基醚(12%),乙氧化三羟甲基丙烷三丙烯酸酯(8%),其中所述4-羟丁基乙烯基醚结构式如下:
所述乙氧化三羟甲基丙烷三丙烯酸酯结构式如下:
所述光引发剂包括4-(苯硫基)苯基二苯基硫鎓六氟磷酸盐(0.1%),2,4,6-三甲基苯甲酰基-二苯基氧化膦(0.3%),其中所述4-(苯硫基)苯基二苯基硫鎓六氟磷酸盐结构式如下:
所述2,4,6-三甲基苯甲酰基-二苯基氧化膦结构式如下:
所述间隔粒子直径为5μm,镇江爱邦电子科技有限公司生产。
所述溶剂为乙酸乙酯,其结构式如下:
所述偶联剂为γ-氨丙基三乙氧基硅烷,其结构式如下:
本发明还提供了一种聚合物分散液晶材料的制作方法,包括如下步骤:
(1)选取两片导电膜作为基材,导电材质为氧化铟锡(ITO),表面方阻为500Ω。
(2)制胆甾相液晶:取向列型液晶SLC100(江苏和成显示科技有限公司)6.8g和手性剂S811(江苏和成显示科技有限公司)1.2g在80℃下混合搅拌2小时,得到胆甾相液晶;
(3)室温避光环境下将胆甾相液晶,4-羟丁基乙烯基醚,乙氧化三羟甲基丙烷三丙烯酸酯,4-(苯硫基)苯基二苯基硫鎓六氟磷酸盐,2,4,6-三甲基苯甲酰基-二苯基氧化膦,间隔粒子,乙酸乙酯,γ-氨丙基三乙氧基硅烷按比例混合到一起,搅拌2h以上,得到混合物A。
(4)将混合物A均匀涂布到两片导电膜中间,经紫外光照射固化,照度为0.3W/m2,固化时间1min,即得到所述聚合物分散液晶材料。
(5)在导电膜上书写,所述材料受压即可显示字迹,字迹亮度高,粗细适中;在两片导电膜上施加36V交流电,持续2s,字迹清除,具有双稳态,可用作手写膜使用。
实施例2:
本实施例提供了一种聚合物分散液晶材料,所述聚合物分散液晶材以重量计包括以下组份:胆甾相液晶70%,光固化单体(23%),光引发剂0.7%,间隔粒子1%,溶剂5%,偶联剂0.3%。
所述胆甾相液晶的双折射率Δn≥0.16。
所述光固化单体包括环三羟甲基丙烷甲缩醛丙烯酸酯(15%),三乙二醇二乙烯基醚(6%),三甲基丙烷三甲基丙烯酸酯(2%),其中所述环三羟甲基丙烷甲缩醛丙烯酸酯结构式如下:
所述三乙二醇二乙烯基醚结构式如下:
所述三甲基丙烷三甲基丙烯酸酯结构式如下:
所述光引发剂包括4-异丁基苯基-4′-甲基苯基碘鎓六氟磷酸盐0.2%,2,4,6-三甲基苯甲酰基苯基膦酸乙酯0.5%,其中所述4-异丁基苯基-4′-甲基苯基碘鎓六氟磷酸盐结构式如下:
所述2,4,6-三甲基苯甲酰基苯基膦酸乙酯结构式如下:
所述间隔粒子:直径5μm,镇江爱邦电子科技有限公司生产。
所述溶剂为正庚烷,其结构式如下:
所述偶联剂为γ-缩水甘油醚氧丙基三甲氧基硅烷,其结构式如下:
本发明还提供了一种聚合物分散液晶材料的制作方法,包括如下步骤:
(1)选取两片导电膜作为基材,导电材质为氧化铟锡(ITO),表面方阻为600Ω。
(2)制胆甾相液晶:取向列型液晶SLC100(江苏和成显示科技有限公司)7g和手性剂S811(江苏和成显示科技有限公司)1g在80℃下混合搅拌2小时,得到胆甾相液晶;
(3)室温避光环境下将胆甾相液晶,环三羟甲基丙烷甲缩醛丙烯酸酯,三乙二醇二乙烯基醚,三甲基丙烷三甲基丙烯酸酯,4-异丁基苯基-4′-甲基苯基碘鎓六氟磷酸盐,2,4,6-三甲基苯甲酰基苯基膦酸乙酯,间隔粒子,正庚烷,γ-缩水甘油醚氧丙基三甲氧基硅烷按比例混合到一起,搅拌2h以上,得到混合物A。
(4)将混合物A均匀涂布到两片导电膜中间,经紫外光照射固化,照度为0.5W/m2,固化时间1min,即得到所述聚合物分散液晶材料。
(5)在导电膜上书写,所述材料受压即可显示字迹,字迹亮度高,粗细适中;在两片导电膜上施加30V交流电,持续2s,字迹清除,具有双稳态,可用作手写膜使用。
上述实施例仅仅是为清楚地说明所作的举例,而并非对实施方式的限定,对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其他不同形式的变化或变动,这里无需也无法对所有的实施方式予以穷举,而由此所引申的显而易见的变化或变动仍处于本发明创造的保护范围之中。
Claims (5)
1.一种聚合物分散液晶材料,其特征在于:所述聚合物分散液晶材料以重量计包括以下组份:胆甾相液晶(40-85%),光固化单体(7%-59.75%),光引发剂(0.05-1%),间隔粒子(0.05-1%),溶剂(0.1-5%),偶联剂(0.05-1%)。
2.根据权利要求1所述的一种聚合物分散液晶材料,其特征在于:所述胆甾相液晶的双折射率Δn≥0.16。
3.根据权利要求1所述的一种聚合物分散液晶材料,其特征在于:所述光固化单体为乙烯基类单体、乙烯基醚类单体、甲基丙烯酸酯类单体、丙烯酸酯类单体中的一种或几种。
4.根据权利要求1所述的一种聚合物分散液晶材料,其特征在于:所述光引发剂为4-(苯硫基)苯基二苯基硫鎓六氟磷酸盐、4-异丁基苯基-4’-甲基苯基碘鎓六氟磷酸盐,2,4,6-三甲基苯甲酰基-二苯基氧化膦,2,4,6-三甲基苯甲酰基苯基膦酸乙酯、2-甲基-1-(4-甲硫基苯基)-2-吗啉-1-丙酮、2-羟基-2-甲基-1-苯基丙酮中的一种或多种。
5.一种聚合物分散液晶材料及其制作方法,其特征在于,包括如下步骤:
(1)基材选取:两片导电膜,表面方阻为100-1000Ω。
(2)制胆甾相液晶:取TN型液晶和手性剂在80℃下混合搅拌2小时,得到胆甾相液晶;
(3)室温避光环境下将胆甾相液晶,光固化单体,光引发剂,间隔粒子,溶剂,偶联剂混合到一起,搅拌2h以上,得到混合物A。
(4)将混合物A均匀涂布到两片导电膜中间,经紫外光照射固化,照度为0.1-10mW/m2,固化时间0.5-10min,即得到所述材料。
(5)在导电膜上书写,所述材料受压即可显示字迹,在两片导电膜上施加10-40V交流电,字迹清除,具有双稳态,可用作手写膜使用。
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