CN111944411B - 一种低彩虹纹聚酯光学膜涂布液及其制备方法 - Google Patents
一种低彩虹纹聚酯光学膜涂布液及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种低彩虹纹聚酯光学膜涂布液及其制备方法,包括以下重量组分:10~50%水性聚氨酯、10~50%水性聚酯、0.1~1%三聚氰胺树脂、0.5~1.5%有机溶剂、0.05~0.5%润湿剂、0.1~1%纳米粒子、0.01~0.1%pH值调节剂,余量为去离子水。本发明通过组分及其比例、制备工艺及参数的设置,制得涂布液,聚酯薄膜经该涂布液在线底涂处理后,能够降低PET基材和硬化涂层的折射率差异,降低光学膜的彩虹纹现象,并能增强与硬化层胶水的附着力,所制得的聚酯薄膜,具备雾度低、透光率高的性质,彩虹纹轻淡、爽滑性好,对光学功能涂层的粘结力强,适于制造ITO膜、IMD膜、保护膜等需要硬化加工的薄膜,适合广泛推广与使用。
Description
技术领域
本发明涉及硬化膜底涂用涂布液领域,具体是一种低彩虹纹聚酯光学膜涂布液及其制备方法。
背景技术
聚酯薄膜的物理性能、机械性能和光学性能优越,在液晶显示、模内装饰、光学保护方面均具有广泛的应用。聚酯光学膜在用于制造ITO膜、IMD膜、保护膜等需要硬化加工的薄膜时,由于PET基材、硬化涂布层折射率的差异,在光的干涉影响下,会产生彩虹纹不良,影响薄膜光线透光率和视觉观察效果。因此,我们提出一种低彩虹纹聚酯光学膜涂布液及其制备方法。
发明内容
本发明的目的在于提供一种低彩虹纹聚酯光学膜涂布液及其制备方法,以解决现有技术中的问题。
为实现上述目的,本发明提供如下技术方案:一种低彩虹纹聚酯光学膜涂布液,包括以下重量组分:10~50%水性聚氨酯、10~50%水性聚酯、0.1~1%三聚氰胺树脂、0.5~1.5%有机溶剂、0.05~0.5%润湿剂、0.1~1%纳米粒子、0.01~0.1%pH值调节剂,余量为去离子水。
在上述技术方案中,水性聚氨酯树脂机械性能优越,与其他物料间的相容性较好,水性共聚聚酯树脂具有较高的透明度且冲击韧性和耐化学性能较好,三聚氰胺树脂能够提高体系的硬度,提高所制涂层的耐刮性能,且底涂树脂具体选用高折射率(折射率接近1.6)的水性聚氨酯树脂和水性共聚聚酯树脂,为所制涂布液实现光学膜的低彩虹纹提供有利基础,纳米粒子能够提高所制涂布液的稳定性,添加有机溶剂、润湿剂、pH值调节剂、去离子水组成涂布液的体系,为涂布液在聚酯薄膜的涂布提供便利,多种组分及比例的设置制得涂布液,能够在实现所制涂层低彩虹纹的同时,确保涂层的综合性能。
进一步的,所述水性聚氨酯的固含量为20%,折射率为1.579。
进一步的,所述水性聚酯的固含量为15%,折射率为1.6。
进一步的,所述三聚氰胺树脂的固含量为78~80%。
进一步的,所述有机溶剂为无水乙醇,所述润湿剂为聚醚改性聚硅氧烷、有机氟碳化合物类润湿剂中的一种或多种。
进一步的,所述纳米粒子为二氧化硅,所述纳米粒子的粒径为65nm。
在上述技术方案中,对原料组分的限定更利于所制涂布液及涂层功能的实现,在此限定条件下发挥原料组分的功能、效应,使得所制涂布液及涂层性能达到最优化,且适用于本申请中涂布液、涂层的制备工艺。
一种低彩虹纹聚酯光学膜涂布液的制备方法,包括以下步骤:
1)取润湿剂加入有机溶剂进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的50%~80%,制得溶液A;
2)搅拌溶液A,取水性聚氨酯、水性聚酯分别缓慢加入到溶液A中,持续搅拌,制得溶液B;
3)取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;
4)搅拌溶液C,取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,缓慢加入到溶液C中,然后加入去离子水,搅拌5~30min,取pH值调节剂调节pH值至8.0~8.5,继续搅拌1~2h,制得固含量为5~15%的水性涂布液。
进一步的,所述步骤2)包括以下步骤:
取水性聚氨酯、水性聚酯混合并高速剪切乳化5~30min后,得到混合树脂,搅拌溶液A并缓慢加入混合树脂,继续搅拌,制得溶液B。
进一步的,所述水性聚氨酯的制备步骤为:
取三乙硫醇胺改性偶联剂与纳米二氧化钛反应,制得改性纳米二氧化钛;
取双酚A性环氧树脂与乙二醇胺反应,加入4,4`-二羟基二苯硫醚、环氧氯丙烷反应,制得改性环氧树脂;
取聚氧化丙烯二醇、间苯二甲基二异氰酸酯、2,3-双(2-巯基乙硫基)-1-丙硫醇、1,4-丁二醇-2-磺酸钠为单体反应共聚,并加入改性纳米二氧化钛、改性环氧树脂共混,制得水性聚氨酯;
所述水性聚酯的制备步骤为:取1,4-环己烷二甲醇、联苯二甲酸、对苯二甲酸、2,6-萘二甲酸二甲酯、3-巯基-1-丙磺酸钠为单体共聚,并加入三氟丙基甲基环三硅氧烷反应,制得水性聚酯。
在上述技术方案中,2,3-双(2-巯基乙硫基)-1-丙硫醇在提高所制聚氨酯透光率和折射率的同时,并能够提高其硬度和抗冲击性,改性环氧树脂和改性纳米二氧化钛引入含硫基团和环氧基团,提高所制聚氨酯的折射率和耐摩擦性能;以上述单体制备得到的水性共聚聚酯具有较高的折射率,并提高所制树脂的保色性、耐候性和耐水性,二者共混形成涂布液,确保所制涂层的折射率,保证所制涂层的低彩虹性能,同时提高所制涂层的综合性能。
一种低彩虹纹聚酯光学膜的制备方法,包括以下步骤:
1)制片:
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,按配比混料,并输送至主、辅挤出机中,于270~290℃温度下熔融、挤出,经过滤器过滤、计量泵计量后由三层共挤模头挤出,在冷鼓上流延铸片,形成三层结构的膜片D;
2)纵向拉伸:
取所制膜片D,进行预热,预热温度为70~85℃,然后置于70~85%的红外线加热器内进行加热,以3~4倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;
3)涂布:
取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在5~15g/m2,制得膜片F;
4)横向拉伸:
取膜片F,进行预热,预热温度为100~130℃,于110~150℃温度下,以3~4倍的横向拉伸倍率进行横向拉伸;
然后于220~250℃的条件下进行热定型处理和烘干固化,处理时间为10~15s,最后于50~120℃温度下,冷却后牵引收卷,此时涂层厚度100~150nm,制得成品聚酯光学膜。
在上述技术方案中,所述聚酯基材包括但不限于PET、PBT、PAR,也包括以聚酯为主树脂的复合树脂材料,通过设置涂布液、涂布有该涂布液聚酯光学膜的制备工艺及工艺参数,得到性能均匀的涂布液,使得所制涂布液及涂层的性能达到最优化的表达,涂布液适应于聚酯光学膜的生产工艺,促进提高聚酯光学膜的雾度、透光率等光学性能的提高。
与现有技术相比,本发明所达到的的有益效果如下:
本发明的低彩虹纹聚酯光学膜涂布液及其制备方法,通过组分及其比例、制备工艺及参数的设置,制得涂布液,聚酯薄膜经该涂布液在线底涂处理后,能够降低PET基材(折射率1.6)和硬化涂层(折射率1.5)的折射率差异,从而降低光学膜的彩虹纹现象,并能增强与硬化层胶水的附着力,采用本发明的低彩虹水性涂布液涂布制得的聚酯薄膜,能够具备雾度低、透光率高的性质,所制聚酯薄膜彩虹纹轻淡、爽滑性好,对光学功能涂层的粘结力强,适于制造ITO膜、IMD膜、保护膜等需要硬化加工的薄膜。
具体实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1-6中水性聚氨酯、水性聚酯的制备步骤为:
取三乙硫醇胺改性偶联剂与纳米二氧化钛反应,制得改性纳米二氧化钛;取双酚A性环氧树脂与乙二醇胺反应,加入4,4`-二羟基二苯硫醚、环氧氯丙烷反应,制得改性环氧树脂;取聚氧化丙烯二醇、间苯二甲基二异氰酸酯、2,3-双(2-巯基乙硫基)-1-丙硫醇、1,4-丁二醇-2-磺酸钠为单体反应共聚,并加入改性纳米二氧化钛、改性环氧树脂共混,制得水性聚氨酯;
所述水性聚酯的制备步骤为:取1,4-环己烷二甲醇、联苯二甲酸、对苯二甲酸、2,6-萘二甲酸二甲酯、3-巯基-1-丙磺酸钠为单体共聚,并加入三氟丙基甲基环三硅氧烷反应,制得水性聚酯。
实施例1
按质量百分比,取10%水性聚氨酯、30%水性聚酯、0.4%三聚氰胺树脂、0.4%无水乙醇、0.1%聚醚改性聚硅氧烷、0.2%有机氟碳化合物类润湿剂、0.4%纳米粒子、58.5%去离子水,备用;
取润湿剂加入无水乙醇进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的50%,制得溶液A;取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B;取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,以搅拌状态缓慢加入到溶液C中,然后加入去离子水,搅拌6min,取pH值调节剂调节pH值至8.1,继续搅拌1.1h,制得水性涂布液。
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于270℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;取所制膜片D,进行预热,预热温度为70℃,然后置于70%的红外线加热器内进行加热,以3倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在5g/m2,制得膜片F;取膜片F,进行预热,预热温度为100℃,于110℃温度下,以3倍的横向拉伸倍率进行横向拉伸;然后于220℃的条件下进行热定型处理和烘干固化,处理时间为10s,最后于50℃温度下,冷却后牵引收卷,此时涂层厚度110nm,聚酯薄膜厚度为50μm,制得成品聚酯光学膜。
实施例2
按质量百分比,取20%水性聚氨酯、20%水性聚酯、0.5%三聚氰胺树脂、0.4%无水乙醇、0.1%聚醚改性聚硅氧烷、0.2%有机氟碳化合物类润湿剂、0.5%纳米粒子、58.3%去离子水,备用;
取润湿剂加入无水乙醇进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的65%,制得溶液A;取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B;取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,以搅拌状态缓慢加入到溶液C中,然后加入去离子水,搅拌16min,取pH值调节剂调节pH值至8.3,继续搅拌1.5h,制得水性涂布液。
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于280℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;取所制膜片D,进行预热,预热温度为77℃,然后置于77%的红外线加热器内进行加热,以3.5倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在10g/m2,制得膜片F;取膜片F,进行预热,预热温度为115℃,于130℃温度下,以3.5倍的横向拉伸倍率进行横向拉伸;然后于235℃的条件下进行热定型处理和烘干固化,处理时间为12s,最后于85℃温度下,冷却后牵引收卷,此时涂层厚度115nm,聚酯薄膜厚度为50μm,制得成品聚酯光学膜。
实施例3
按质量百分比,取30%水性聚氨酯、10%水性聚酯、0.5%三聚氰胺树脂、0.5%无水乙醇、0.2%聚醚改性聚硅氧烷、0.2%有机氟碳化合物类润湿剂、0.5%纳米粒子、58.1%去离子水,备用;
取润湿剂加入无水乙醇进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的80%,制得溶液A;取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B;取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,以搅拌状态缓慢加入到溶液C中,然后加入去离子水,搅拌10min,取pH值调节剂调节pH值至8.5,继续搅拌1.5h,制得固含量为水性涂布液。
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于290℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;取所制膜片D,进行预热,预热温度为85℃,然后置于85%的红外线加热器内进行加热,以4倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在15g/m2,制得膜片F;取膜片F,进行预热,预热温度为130℃,于150℃温度下,以4倍的横向拉伸倍率进行横向拉伸;然后于250℃的条件下进行热定型处理和烘干固化,处理时间为15s,最后于120℃温度下,冷却后牵引收卷,此时涂层厚度125nm,聚酯薄膜厚度为75μm,制得成品聚酯光学膜。
实施例4
按质量百分比,取40%水性聚氨酯、10%水性聚酯、0.5%三聚氰胺树脂、0.5%无水乙醇、0.1%聚醚改性聚硅氧烷、0.3%有机氟碳化合物类润湿剂、0.8%纳米粒子、47.8%去离子水,备用;
取润湿剂加入无水乙醇进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的65%,制得溶液A;取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B;取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,以搅拌状态缓慢加入到溶液C中,然后加入去离子水,搅拌16min,取pH值调节剂调节pH值至8.3,继续搅拌1.5h,制得水性涂布液。
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于280℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;取所制膜片D,进行预热,预热温度为77℃,然后置于77%的红外线加热器内进行加热,以3.5倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在10g/m2,制得膜片F;取膜片F,进行预热,预热温度为115℃,于130℃温度下,以3.5倍的横向拉伸倍率进行横向拉伸;然后于235℃的条件下进行热定型处理和烘干固化,处理时间为12s,最后于85℃温度下,冷却后牵引收卷,此时涂层厚度120nm,聚酯薄膜厚度为125μm,制得成品聚酯光学膜。
实施例5
按质量百分比,取10%水性聚氨酯、40%水性聚酯、0.6%三聚氰胺树脂、0.8%无水乙醇、0.1%聚醚改性聚硅氧烷、0.4%有机氟碳化合物类润湿剂、1.0%纳米粒子、47.1%去离子水,备用;
取润湿剂加入无水乙醇进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的65%,制得溶液A;取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B;取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,以搅拌状态缓慢加入到溶液C中,然后加入去离子水,搅拌16min,取pH值调节剂调节pH值至8.3,继续搅拌1.5h,制得水性涂布液。
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于280℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;取所制膜片D,进行预热,预热温度为77℃,然后置于77%的红外线加热器内进行加热,以3.5倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在10g/m2,制得膜片F;取膜片F,进行预热,预热温度为115℃,于130℃温度下,以3.5倍的横向拉伸倍率进行横向拉伸;然后于235℃的条件下进行热定型处理和烘干固化,处理时间为12s,最后于85℃温度下,冷却后牵引收卷,此时涂层厚度135nm,聚酯薄膜厚度为125μm,制得成品聚酯光学膜。
实施例6
按质量百分比,取30%水性聚氨酯、20%水性聚酯、0.8%三聚氰胺树脂、1.0%无水乙醇、0.1%聚醚改性聚硅氧烷、0.4%有机氟碳化合物类润湿剂、1.0%纳米粒子、46.7%去离子水,备用;
取润湿剂加入无水乙醇进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的65%,制得溶液A;取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B;取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,以搅拌状态缓慢加入到溶液C中,然后加入去离子水,搅拌16min,取pH值调节剂调节pH值至8.3,继续搅拌1.5h,制得水性涂布液。
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于280℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;取所制膜片D,进行预热,预热温度为77℃,然后置于77%的红外线加热器内进行加热,以3.5倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;取膜片E,将制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在10g/m2,制得膜片F;取膜片F,进行预热,预热温度为115℃,于130℃温度下,以3.5倍的横向拉伸倍率进行横向拉伸;然后于235℃的条件下进行热定型处理和烘干固化,处理时间为12s,最后于85℃温度下,冷却后牵引收卷,此时涂层厚度130nm,聚酯薄膜厚度为100μm,制得成品聚酯光学膜。
实施例7
将实施例5中的步骤“取水性聚氨酯、水性聚酯分别以搅拌状态缓慢加入到溶液A中,持续搅拌,制得溶液B”更换为“将取水性聚氨酯、水性聚酯混合并高速剪切乳化17min后,得到混合树脂,搅拌溶液A并缓慢加入混合树脂,继续搅拌,制得溶液B”,其余工艺及参数与实施例5相同,得到聚酯薄膜厚度和涂层厚度与实施例4相同的成品聚酯光学膜。
对比例1
取普通涂布液对膜片进行涂布,聚酯光学膜制备的其余步骤与实施例2相同,得到聚酯薄膜厚度和涂层厚度与实施例2相同的成品聚酯光学膜。
对比例2
将水性聚氨酯替换为普通水性共聚聚酯树脂,其余工艺及参数与实施例2相同,得到聚酯薄膜厚度和涂层厚度与实施例2相同的成品聚酯光学膜。
对比例3
将水性聚酯替换为普通水性共聚聚酯树脂,其余工艺及参数与实施例2相同,得到聚酯薄膜厚度和涂层厚度与实施例2相同的成品聚酯光学膜。
对比例4
将水性聚氨酯、水性聚酯替换为普通水性聚氨酯树脂、水性共聚聚酯树脂,其余工艺及参数与实施例2相同,得到聚酯薄膜厚度和涂层厚度与实施例2相同的成品聚酯光学膜。
实验
取实施例1-7中得到的聚酯光学膜,制得试样,分别对其透光率、雾度、摩擦系数、附着性和彩虹纹现象进行检测并记录检测结果:
其中,透光率、雾度测试采用德国BYK公司AT-4725透射雾影仪,测试标准为ASTMD1003,摩擦系数采用美国THWING-ALBERT公司FP-2260摩擦系数测试仪,测试标准为ASTMD1894,附着性测试,采用百格法测试,测试标准为ASTM D3359。
根据上表中的数据,可以清楚得到以下结论:
实施例1-7中得到的聚酯光学膜与对比例1-4得到的聚酯光学膜形成对比,检测结果可知,实施例1-7中聚酯光学膜的透光率和附着性与对比例1-4相比有着明显提高,实施例1-7中聚酯光学膜的雾度、摩擦系数与对比例1-4相比明显下降,这充分说明了本发明实现了对聚酯光学膜透光率、雾度附着性的提升,降低了聚酯光学膜的摩擦系数,且有实验数据和实验现象可知,实施例4与实施例7相比,其透光率、附着性、雾度、摩擦系数,彩虹纹现象均匀改善,充分说明对树脂的乳化工序能够促进彩虹纹现象的降低,实施例2与对比例1-4相比,其透光率、附着性、雾度、摩擦系数,彩虹纹现象均有变化,充分说明对树脂的改性能够促进彩虹纹现象的降低,效果稳定,具有较高实用性。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (9)
1.一种低彩虹纹聚酯光学膜涂布液的制备方法,其特征在于,包括以下步骤:
1)取润湿剂加入有机溶剂进行稀释,然后缓慢加入到去离子水中,并搅拌均匀,其中去离子水量为配方所需总体水量的50%~80%,制得溶液A;
2)搅拌溶液A,取水性聚氨酯、水性聚酯分别缓慢加入到溶液A中,持续搅拌,制得溶液B;
3)取三聚氰胺树脂加入去离子水进行稀释,缓慢加入到溶液B中,维持搅拌,制得溶液C;
4)搅拌溶液C,取纳米粒子制得水性分散液,溶液中二氧化硅的含量为40%,加入去离子水进行稀释,搅拌均匀后,缓慢加入到溶液C中,然后加入去离子水,搅拌5~30min,利用pH值调节剂调节pH值至8.0~8.5,继续搅拌1~2h,制得固含量为5~15%的水性涂布液;
所述水性聚氨酯的制备步骤为:
取三乙硫醇胺改性偶联剂与纳米二氧化钛反应,制得改性纳米二氧化钛;
取双酚A性环氧树脂与乙二醇胺反应,加入4,4`-二羟基二苯硫醚、环氧氯丙烷反应,制得改性环氧树脂;
取聚氧化丙烯二醇、间苯二甲基二异氰酸酯、2,3-双(2-巯基乙硫基)-1-丙硫醇、1,4-丁二醇-2-磺酸钠为单体反应共聚,并加入改性纳米二氧化钛、改性环氧树脂共混,制得水性聚氨酯;
所述水性聚酯的制备步骤为:取1,4-环己烷二甲醇、联苯二甲酸、对苯二甲酸、2,6-萘二甲酸二甲酯、3-巯基-1-丙磺酸钠为单体共聚,并加入三氟丙基甲基环三硅氧烷反应,制得水性聚酯。
2.根据权利要求1所述的一种低彩虹纹聚酯光学膜涂布液的制备方法,其特征在于,所述步骤2)包括以下步骤:
取水性聚氨酯、水性聚酯混合并高速剪切乳化5~30min后,得到混合树脂,搅拌溶液A并缓慢加入混合树脂,继续搅拌,制得溶液B。
3.一种低彩虹纹聚酯光学膜的制备方法,其特征在于,包括以下步骤:
1)制片:
取聚酯基材进行干燥,使得干燥后其含水率低于50ppm,于270~290℃温度下熔融、挤出,过滤、计量后三层共挤,流延铸片,形成三层结构的膜片D;
2)纵向拉伸:
取所制膜片D,进行预热,预热温度为70~85℃,然后置于70~85%的红外线加热器内进行加热,以3~4倍的纵向拉伸倍率进行纵向拉伸,形成膜片E;
3)涂布:
取膜片E,将权利要求2制得的涂布液涂布在膜片E的表面,其中单面涂布的湿涂布量在5~15g/m2,制得膜片F;
4)横向拉伸:
取膜片F,进行预热,预热温度为100~130℃,于110~150℃温度下,以3~4倍的横向拉伸倍率进行横向拉伸;
然后于220~250℃的条件下进行热定型处理和烘干固化,处理时间为10~15s,最后于50~120℃温度下,冷却后牵引收卷,此时涂层厚度100~150nm,制得成品聚酯光学膜。
4.根据权利要求1所述的一种低彩虹纹聚酯光学膜涂布液的制备方法制备的涂布液,其特征在于,包括以下重量组分:10~50%水性聚氨酯、10~50%水性聚酯、0.1~1%三聚氰胺树脂、0.5~1.5%有机溶剂、0.05~0.5%润湿剂、0.1~1%纳米粒子、0.01~0.1%pH值调节剂,余量为去离子水。
5.根据权利要求4所述的涂布液,其特征在于:所述水性聚氨酯的固含量为20%,折射率为1.579。
6.根据权利要求4所述的涂布液,其特征在于:所述水性聚酯的固含量为15%,折射率为1.6。
7.根据权利要求4所述的涂布液,其特征在于:所述三聚氰胺树脂的固含量为78~80%。
8.根据权利要求4所述的涂布液,其特征在于:所述有机溶剂为无水乙醇,所述润湿剂为聚醚改性聚硅氧烷、有机氟碳化合物类润湿剂中的一种或多种。
9.根据权利要求4所述的涂布液,其特征在于:所述纳米粒子为二氧化硅,所述纳米粒子的粒径为65nm。
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