CN112266571A - 一种pdlc调光膜 - Google Patents

一种pdlc调光膜 Download PDF

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CN112266571A
CN112266571A CN202011154731.3A CN202011154731A CN112266571A CN 112266571 A CN112266571 A CN 112266571A CN 202011154731 A CN202011154731 A CN 202011154731A CN 112266571 A CN112266571 A CN 112266571A
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蔡正方
李清华
王星星
黄骏昌
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Dongguan Xinju Photoelectric Technology Co ltd
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Abstract

本发明提供了一种PDLC调光膜，包括调光膜，所述调光膜的原料包括以下重量份的组分：液晶分子7～12份、液晶间隔颗粒0.001～0.003份、钇铝石榴石粉体0.001～0.003份、丙烯酸羟丙酯2～5份、光固化剂0.1～0.5份、酚醛树脂50～65份、端羟基含氟聚硅氧烷树脂15～20份、增韧剂1～2份、二氧化钒0.1～0.3份。本发明的PDLC调光膜，制作成本低，通电时透光性好，断电时雾状屏蔽效果优异，并且防水氧能力优异，延长了产品的使用寿命。

Description

一种PDLC调光膜
技术领域
本发明涉及光学膜片技术领域，具体涉及一种PDLC调光膜。
背景技术
PDLC调光膜即聚合物分散液晶薄膜，是一种可调节光线通过状态的膜。调光膜可在透明与非透明状态之间变化，而透明度可由电压调节。其工作原理是：当调光膜两端断电时，其间的高分子液晶材料无序排列，使光线无法穿透薄膜，此时的视觉效果是呈雾状的不透明状态；当调光膜两端通电时，在电场作用下高分子液晶材料有序排列，可使光线透过薄膜，此时的视觉效果是可透视的透明状态。现有技术的PDLC调光膜，通常将大量的液晶分子填充在由单体预聚物与环氧树脂内，并加入少量光固化剂，在紫外光的照射下单体预聚物发生聚合反应以形成一层含液晶分子的调光膜。这种调光膜需要使用较大比例的液晶分子，才能达到理想的切换透明或不透明效果，成本较高，另外，使用环氧树脂作为粘合剂，调光膜容易受水氧影响而出现发黄老化现象，影响调光膜的视觉效果。
发明内容
针对以上问题，本发明提供一种PDLC调光膜，制作成本低，通电时透光性好，断电时雾状屏蔽效果优异，并且防水氧能力优异，延长了产品的使用寿命。
为实现上述目的，本发明通过以下技术方案来解决：
一种PDLC调光膜，包括调光膜，所述调光膜的原料包括以下重量份的组分：液晶分子7～12份、液晶间隔颗粒0.001～0.003份、钇铝石榴石粉体0.001～0.003份、丙烯酸羟丙酯2～5份、光固化剂0.1～0.5份、酚醛树脂50～65份、端羟基含氟聚硅氧烷树脂15～20份、增韧剂1～2份、二氧化钒0.1～0.3份。
具体的，所述液晶间隔颗粒为气相二氧化硅。
具体的，所述光固化剂选自2-羟基-2-甲基-1-苯基丙酮、1-羟基环己基苯基甲酮、2-甲基-2-(4-吗啉基)-1-[4-(甲硫基)苯基]-1-丙酮、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、2-二甲氨基-2-苄基-1-[4-(4-吗啉基)苯基]-1-丁酮、2-羟基-2-甲基-1-[4-(2-羟基乙氧基)苯基]-1-丙酮、苯甲酰甲酸甲酯中的一种。
具体的，所述增韧剂选自羧基丁腈橡胶、液体丁腈橡胶、聚乙烯醇缩丁醛、聚醚砜、聚苯醚酮中的一种。
具体的，所述钇铝石榴石粉体是由氧化钇和氧化铝通过高温固相法制作得到，所述钇铝石榴石粉体的粒径小于80μm。
本发明的有益效果是：
第一、本发明的PDLC调光膜，加入了少量钇铝石榴石粉体，钇铝石榴石粉体具有多个棱面，对光具有极佳的折射效果，在调光膜断电状态下，利用钇铝石榴石粉体的光散射作用，能够增大光的出射角度，降低了液晶分子的用量，在断电状态同样能够实现的较佳的雾化屏蔽效果；
第二、加入了端羟基含氟聚硅氧烷树脂，端羟基含氟聚硅氧烷树脂内含有氟离子，利用氟离子的疏水特性，能够提升调光膜的抗水防潮能力；
第三、加入了酚醛树脂，酚醛树脂具有优异的隔氧能力，能够防止调光膜发黄老化，延长了调光膜的使用寿命，并且还加入了增韧剂，提高了酚醛树脂的韧性，改善其抗冲击性能；
第四、加入了二氧化钒，二氧化钒具有相变特性，相变前后结构的变化可导致对红外光由透射向反射的可逆转变，从而使调光膜在高温时能够隔绝红外辐射，调光膜安装在建筑用窗玻璃上时，可达到防止红外辐射进入室内的效果。
附图说明
图1为本发明的调光膜断电状态的光学示意图，调光膜上下两端均覆盖有ITO导电膜。
图2为本发明的调光膜通电状态的光学示意图，调光膜上下两端均覆盖有ITO导电膜。
具体实施方式
下面结合实施例和附图对本发明作进一步详细的描述，但本发明的实施方式不限于此。
实施例1
一种PDLC调光膜，包括调光膜，调光膜的原料包括以下重量份的组分：液晶分子10份、气相二氧化硅0.002份、钇铝石榴石粉体0.002份、丙烯酸羟丙酯3份、2-羟基-2-甲基-1-苯基丙酮0.2份、酚醛树脂60份、端羟基含氟聚硅氧烷树脂15份、羧基丁腈橡胶1份、二氧化钒0.1份，钇铝石榴石粉体的粒径小于80μm。
PDLC调光膜的制作方法如下：按照上述配方称量液晶分子、气相二氧化硅、钇铝石榴石粉体、丙烯酸羟丙酯、2-羟基-2-甲基-1-苯基丙酮、酚醛树脂、端羟基含氟聚硅氧烷树脂、羧基丁腈橡胶、二氧化钒备用；将称量好的液晶分子、气相二氧化硅、钇铝石榴石粉体、丙烯酸羟丙酯、酚醛树脂、端羟基含氟聚硅氧烷树脂、羧基丁腈橡胶、二氧化钒加入到搅拌装置中，在30～40℃下搅拌20～30min；加入2-羟基-2-甲基-1-苯基丙酮，在30～40℃下继续搅拌10～20min；将上述混合料加入涂布压合机，涂布压合机上的上料槽将混合料均匀涂布到两层ITO膜之间，通过压合辊将两层薄膜压实使其压合间距为10-15um，通过牵引辊将薄膜牵出，经过压合裁切后得到半成品膜层，将半成品膜层转移至紫外光固化机中，在25～40μW/cm2下固化3～5min，得到测试膜层，测试膜层由两层ITO膜以及调光膜构成。
测试：对上述测试膜层进行断电通电测试，测试两个状态下的透光率以及雾度，测试结果记录如下表1。断电状态的光线模拟线如图1所示，视觉效果为雾状不透视；通电状态的光线模拟线如图2所示，视觉效果为可透视。
实施例2
一种PDLC调光膜，包括调光膜，调光膜的原料包括以下重量份的组分：液晶分子8份、气相二氧化硅0.002份、钇铝石榴石粉体0.003份、丙烯酸羟丙酯3份、2-羟基-2-甲基-1-苯基丙酮0.2份、酚醛树脂62份、端羟基含氟聚硅氧烷树脂15份、羧基丁腈橡胶1份、二氧化钒0.1份，钇铝石榴石粉体的粒径小于80μm。
PDLC调光膜的制作方法如下：按照上述配方称量液晶分子、气相二氧化硅、钇铝石榴石粉体、丙烯酸羟丙酯、2-羟基-2-甲基-1-苯基丙酮、酚醛树脂、端羟基含氟聚硅氧烷树脂、羧基丁腈橡胶、二氧化钒备用；将称量好的液晶分子、气相二氧化硅、钇铝石榴石粉体、丙烯酸羟丙酯、酚醛树脂、端羟基含氟聚硅氧烷树脂、羧基丁腈橡胶、二氧化钒加入到搅拌装置中，在30～40℃下搅拌20～30min；加入2-羟基-2-甲基-1-苯基丙酮，在30～40℃下继续搅拌10～20min；将上述混合料加入涂布压合机，涂布压合机上的上料槽将混合料均匀涂布到两层ITO膜之间，通过压合辊将两层薄膜压实使其压合间距为10-15um，通过牵引辊将薄膜牵出，经过压合裁切后得到半成品膜层，将半成品膜层转移至紫外光固化机中，在25～40μW/cm2下固化3～5min，得到测试膜层，测试膜层由两层ITO膜以及调光膜构成。
测试：对上述测试膜层进行断电通电测试，测试两个状态下的透光率以及雾度，测试结果记录如下表1。断电状态的光线模拟线如图1所示，视觉效果为雾状不透视；通电状态的光线模拟线如图2所示，视觉效果为可透视。
表1 测试结果
Figure BDA0002742341700000031
从上表1中实施例1、2的数据可以看出，本发明的调光膜在通电状态下可见光透过率超过90％，断电状态下雾度超过85％，说明本发明的调光膜通电透光性能以及断电雾化屏蔽性能优异。
以上实施例仅表达了本发明的2种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (5)

1.一种PDLC调光膜，包括调光膜，其特征在于，所述调光膜的原料包括以下重量份的组分：液晶分子7～12份、液晶间隔颗粒0.001～0.003份、钇铝石榴石粉体0.001～0.003份、丙烯酸羟丙酯2～5份、光固化剂0.1～0.5份、酚醛树脂50～65份、端羟基含氟聚硅氧烷树脂15～20份、增韧剂1～2份、二氧化钒0.1～0.3份。
2.根据权利要求1所述的一种PDLC调光膜，其特征在于，所述液晶间隔颗粒为气相二氧化硅。
3.根据权利要求1所述的一种PDLC调光膜，其特征在于，所述光固化剂选自2-羟基-2-甲基-1-苯基丙酮、1-羟基环己基苯基甲酮、2-甲基-2-(4-吗啉基)-1-[4-(甲硫基)苯基]-1-丙酮、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、2-二甲氨基-2-苄基-1-[4-(4-吗啉基)苯基]-1-丁酮、2-羟基-2-甲基-1-[4-(2-羟基乙氧基)苯基]-1-丙酮、苯甲酰甲酸甲酯中的一种。
4.根据权利要求1所述的一种PDLC调光膜，其特征在于，所述增韧剂选自羧基丁腈橡胶、液体丁腈橡胶、聚乙烯醇缩丁醛、聚醚砜、聚苯醚酮中的一种。
5.根据权利要求1所述的一种PDLC调光膜，其特征在于，所述钇铝石榴石粉体是由氧化钇和氧化铝通过高温固相法制作得到，所述钇铝石榴石粉体的粒径小于80μm。
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