CN107685519A - 一种多层微孔反射膜及其制备方法 - Google Patents
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Abstract
本发明涉及一种多层微孔反射膜及其制备方法,所述的微孔反射膜为白色不透明的PET薄膜,薄膜本身为三层皮芯结构,第1层和第3层为皮层,第2层为微孔芯层;薄膜厚度为0.5~1mm,微孔直径为5~50µm,微孔密度为109~1011个/cm3。该多层微孔反射膜的制备方法为:以PET、碳酸钙和苯乙烯为主要原料,配以液体润滑剂和抗氧化剂,先在流延膜挤出机中挤出、成膜,然后将流延膜在平板硫化机中压制成多层薄板,最后在双向拉伸薄膜拉伸机上将薄板拉成微孔薄膜。本发明在平板硫化机压制过程中就压制成了多层薄板,再双向拉伸成多层微孔薄膜,省去了多层共挤出繁琐的工艺和高昂的成本,便于工业生产。
Description
技术领域
本发明涉及一种多层微孔反射膜及其制备方法,属于PET薄膜生产技术领域。
背景技术
微孔薄膜是一种泡孔尺寸从一微米到几十微米尺寸的封闭微孔。目前国内对微孔塑料的研究主要集中在采用微发泡成型技术来提升微孔塑料力学性能的提升上。对其光学性能的研究较少,且对其他微孔成型技术研究较少。
事实上,在国外,面对全球对于节能的浪潮,高科技业者纷纷跨足照明灯具领域,期望利用低耗电、高效率的LED以及冷阴极灯管(CCFL)取代效率不佳的日光灯管。新光源灯具的发展虽然极具市场前景,但由于发光元件本身结构的因素,使得灯具制作完成之后产生程度不一的眩光及亮度不均匀现象,故在现阶段推动上仍有一定程度的困难。目前为解决眩光以及亮度不均匀的问题,市场上大多采用光学扩散板或反射板来应用,不过这些材料本身仍存在相当多的限制,例如透光性不佳、成本昂贵、不易进行二次加工、镜面反射率过高以及反射能力不足等。
针对这些新问题,初芝电子(HATSUSHIBA)代理日本古河电工的微发泡反射板(MCPET),能够协助灯具业者解决眩光及亮度不均匀等问题,并且借由微发泡反射板的高反射和扩散能力,在不增加光源的情况下,进而提升灯具的照度,视结构设计与应用,提升幅度可高达40%~60%。
初芝研制的微发泡反射板的正式名称为MCPET(Micro Cellular PET),采用PET(Polyethylene terephthalate)为基材进行发泡制成。MCPET具有下列优点:优异的光反射特性(全反射率:99%以上,扩散反射率:96%,镜面反射率:3%)、轻巧、承受高温(在160℃下仍能保持形状)、可利用PET资源回收方式废弃处理、材料未使用有害原料,表面具有高平滑性等。
另在二次加工方面,初芝表示可利用裁切、冲压、弯曲、加热等方式进行成型。MCPET材料本身的难燃性符合发泡材料UL94-HBF的燃烧标准。此外,由于MCPET材料的绝佳特性,因此对于各波长光源的反射能力都能够维持均一性。
该公司强调,除了LED以及冷阴极灯管(CCFL)灯具之外,对于室内灯源以及广告灯箱的应用方面,也能够在减少灯管数量情况下,维持所期望的亮度与照度,进而减少照明电费的支出,达到节约能源的目的。初芝表示,目前日本机场、便利商店、东京车站和灯具厂都已导入使用MCPET材料,进行包括提升照度、均匀亮度、降低用电等各方面的应用。
采用超临界流体微发泡技术可制备性能较好的反射膜,然而,超临界流体微发泡技术对加工设备要求极高,且成本高昂。当前国内制备的反射膜主要是掺杂碳酸钙,二氧化钛粉末的无发泡薄膜,其镜面反射率过高而漫反射率较低,不适用于LED显示器反光膜。
发明内容
本发明的目是为了克服现有技术中超临界流体微发泡技术对加工设备要求极高、成本高昂的缺陷,提供一种多层微孔反射膜及其制备方法,能够降低成本,填补国内在微发泡反光薄膜这一领域的空白。
本发明的技术解决方案是:一种多层微孔反射膜为白色不透明的PET薄膜,薄膜本身为三层皮芯结构,上下两层为皮层,中间层为微孔芯层;所述薄膜厚度为0.5~1mm,微孔直径为5~50µm,微孔密度为109~1011个/cm3。
优选地,所述PET的熔融指数为0.6~2.6g/10min。
前述多层微孔反射膜的制备方法的具体步骤为:
(1)芯层料预混:按重量比为(400~500)∶(50~200)∶(50~100)依次称取PET粉料或粒料、液体润滑剂及纳米级CaCO3,将三者置于混料机中低速搅拌20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:称取PET粉料,按100重量份数PET加入0.01~0.02重量份数的比例加入抗紫外线剂,置于混料机中低速搅拌10~20min后取出,得到预混料B;
(3)流延薄膜制备:按(400~500)重量份的预混料A∶(100~130)重量份的预混料B的用量比,将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压;
(5)双向拉伸:用双向拉伸机把薄板A进行双向拉伸,最终制得多层微孔薄膜。
进一步地,所述液体润滑剂为液体石蜡或石油醚。
进一步地,步骤(2)中所述抗紫外线剂为3-(2)中苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3、滑石粉中的一种或多种的组合。
进一步地,步骤(3)中所述流延薄膜制备的参数是:料筒温度为280~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.4mm。
进一步地,步骤(3)中所述的双螺杆长径比为(33∶1)~(55∶1)。
更进一步地,所述双螺杆的控制温度范围为280~330℃;第一区温度设定范围为280~300℃,即将PET熔融;第二区温度设定为300~330℃,即将PET与其他原料充分混合;第三区温度设定为290~300℃,便于流延成膜。
更进一步地,所述步骤(4)中,平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,最大模压为0.63Mpa,模压时间为10~50min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm。
再进一步地,步骤(5)中所述双向拉伸机的拉伸倍数为1~3倍,其中,纵向进行1.5~3倍拉伸,横向进行1.2~2倍拉伸,拉伸温度为150~200℃。
本发明技术方案的突出的实质性特点和显著的进步主要体现在:
1、本发明所述多层微孔反射膜泡孔均匀,且,镜面反射率较低而漫反射率较高。
2、本发明所述多层微孔反射膜的制备方法利用拉伸致孔,免去了微发泡工艺对设备复杂的要求,同时所制备的薄膜泡孔均匀,同微发泡工艺相比,该方法简化了制备工艺,节约能源,并能得到泡孔均匀的PET薄膜。
3、本发明所述反射膜可用于LED以及冷阴极灯管(CCFL)灯具,还可应用于室内灯源以及广告灯箱,在减少灯管数量情况下,维持所期望的亮度与照度,进而减少照明电费的支出,达到节约能源的目的。
附图说明
图1为本发明所述多层微孔反射薄膜的结构示意图。
其中,标记含义为:1-薄膜第1层,2-薄膜第2层,3-薄膜第3层。
具体实施方式
本发明涉及一种多层微孔反射膜及其制备方法,该反射膜是基于拉伸致孔技术的平板显示的反射膜,是一种白色不透明的聚对苯二甲酸乙二醇酯(PET)多层微孔薄膜。如图1所述,本发明所述薄膜本身为皮芯结构,共分为三层:第1层和第3层为皮层,第2层为微孔芯层。薄膜厚度为0.5~1mm,微孔直径为5~50µm,微孔密度为109~1011个/cm3。
前述薄膜的制备主要是以PET为基体,PS为交联剂,CaCO3为填料,苯基水杨酸酯为抗紫外线剂;首先将PET和CaCO3混合后进行流延膜挤出,再次将PET和苯基水杨酸酯混合后,再进行流延膜挤出,将制得的薄膜依次叠合,将此叠合的薄膜放入平板硫化机中进行热压,压制的薄板称为薄板,最后用双向拉伸机把薄板进行双向拉伸,最终制得多层微孔薄膜。
其具体步骤如下:
(1)芯层料预混:按重量比为(400~500)∶(50~200)∶(50~100)依次称取PET粉料或粒料、液体润滑剂及纳米级CaCO3,将三者置于混料机中低速搅拌20~30min后取出,称为预混料A;所述液体润滑剂为液体石蜡或石油醚;
(2)抗紫外线皮层料预混:称取PET粉料,按100重量份数PET加入0.01~0.02重量份数的比例加入抗紫外线剂,置于混料机中低速搅拌10~20min后取出,得到预混料B;所述抗紫外线剂是3-(2)中苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3、滑石粉中的一种或多种的组合;
(3)流延薄膜制备:按(400~500)重量份的预混料A∶(100~130)重量份的预混料B的用量比,将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B;其中,料筒温度为280~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.4mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压;所述平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~50min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向1.5~3倍拉伸,横向1.2~2倍拉伸,拉伸温度为150~200℃,最终制得多层微孔薄膜。
优选地,前述PET的熔融指数为0.6~2.6g/10min;双螺杆长径比为33∶1~55∶1,平板硫化机的最大模压为0.63MPa,双向拉伸机的拉伸倍数为1~3倍;所述双螺杆的控制温度范围为280~330℃;第一区温度设定范围为280~300℃,即将PET熔融;第二区温度设定为300~330℃,即将PET与其他原料充分混合;第三区温度设定为290~300℃,便于流延成膜。
前述平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~50min,该参数便于PET流延膜间的苯乙烯发生聚合,体积收缩,有利于层间空隙的形成。前述双向拉伸机的拉伸温度为150~200℃,纵向拉伸为1.5~3倍,横向拉伸为1.2~2倍,此时便于PET薄板的层间发生运动,导致微孔的形成。
本发明利用拉伸致孔,免去了微发泡工艺对设备复杂的要求,同时所制备的薄膜泡孔均匀,同微发泡工艺相比,该方法简化了制备工艺,同时节约能源,并能得到泡孔均匀的PET薄膜。
以下结合具体实施例对本发明技术方案进行具体的阐述,但是这只是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以作出若干改进和变型,这些改进和变型也应该视为在本发明的保护范围之内。
实施例1
(1)芯层料预混:PET(粉料、粒料)400~500g,液体润滑剂(液体石蜡、石油醚)50~200g,CaCO3(纳米级)50~100g;将树脂与液体润滑剂及CaCO3置于混料机中低速搅拌,20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:按比例称取PET粉料及苯基水杨酸酯、2羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3、滑石粉等一种或多种组成的组群,将称取物混合后置于混料机中低速搅拌,10~20min后取出,得到预混料B。按质量分数计算,所用量为:PET 100~120g,抗紫外线剂 0.01~0.02g;
(3)流延薄膜制备:将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B。其中,料筒温度为290~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.35mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压。平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~40min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向1.5~3倍拉伸,横向1.2~2倍拉伸,拉伸温度为150~180℃,最终制得多层微孔薄膜。
拉伸后制得厚度为0.5mm的PET微孔薄膜,其泡孔直径为10~35µm,泡孔密度为109~1011个/cm3,为白色不透明薄膜,经测试对可见光的漫反射率达95%。
实施例2
(1)芯层料预混:PET(粉料、粒料)400~500g,液体润滑剂(液体石蜡、石油醚)50~200g,CaCO3(纳米级)50~100g;将树脂与液体润滑剂及CaCO3置于混料机中低速搅拌,20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:按比例称取PET粉料及苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3、滑石粉等一种或多种组成的组群,将称取物混合后置于混料机中低速搅拌,10~20min后取出,得到预混料B。按质量分数计算,所用量为:PET 100~120g,抗紫外线剂0.01~0.015g;
(3)流延薄膜制备:将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B。其中,料筒温度为290~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.35mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压。平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~40min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向1.5~2倍拉伸,横向1.2~1.5倍拉伸,拉伸温度为150~180℃,最终制得多层微孔薄膜。
拉伸后制得厚度为0.5mm的PET微孔薄膜,其泡孔直径为10~25µm,泡孔密度为108~1010个/cm3,为白色不透明薄膜,经测试对可见光的漫反射率达94%。
实施例3
(1)芯层料预混:PET(粉料、粒料)400~500g,液体润滑剂(液体石蜡、石油醚)50~200g,CaCO3(纳米级)50~100g;将树脂与液体润滑剂及CaCO3置于混料机中低速搅拌,20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:按比例称取PET粉料及苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3,滑石粉等一种或多种组成的组群,将称取物混合后置于混料机中低速搅拌,10~20min后取出,得到预混料B。按质量分数计算,所用比例为:PET 100~120g,抗紫外线剂0.01~0.02g;
(3)流延薄膜制备:将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B。其中,料筒温度为290~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.35mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压。平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~40min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向2.5~3倍拉伸,横向1.6~2倍拉伸,拉伸温度为150~180℃,最终制得多层微孔薄膜。
拉伸后制得厚度为0.5mm的PET微孔薄膜,其泡孔直径为10~25µm,泡孔密度为109~1011个/cm3,为白色不透明薄膜,经测试对可见光的漫反射率达98%。
实施例4
(1)芯层料预混:PET(粉料、粒料)400~500g,液体润滑剂(液体石蜡、石油醚)50~200g,CaCO3(纳米级)50~100g;将树脂与液体润滑剂及CaCO3置于混料机中低速搅拌,20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:按比例称取PET粉料及苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3、滑石粉等一种或多种组成的组群,将称取物混合后置于混料机中低速搅拌,10~20min后取出,得到预混料B。按质量分数计算,所用比例为:PET 100~120g,抗紫外线剂0.01~0.02g;
(3)流延薄膜制备:将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B。其中,料筒温度为290~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.35mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压。平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~40min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向1.5~2.5倍拉伸,横向1.6~2倍拉伸,拉伸温度为160~180℃,最终制得多层微孔薄膜。
拉伸后制得厚度为0.5mm的PET微孔薄膜,其泡孔直径为10~30µm,泡孔密度为109~1011个/cm3,为白色不透明薄膜,经测试对可见光的漫反射率达96%。
实施例5
(1)芯层料预混:PET(粉料、粒料)400~500g,液体润滑剂(液体石蜡、石油醚)50~200g,CaCO3(纳米级)50~100g;将树脂与液体润滑剂及CaCO3置于混料机中低速搅拌,20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:按比例称取PET粉料及苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3,滑石粉等一种或多种组成的组群,将称取物混合后置于混料机中低速搅拌,10~20min后取出,得到预混料B。按质量分数计算,所用比例为:PET 100~120g,抗紫外线剂0.01~0.02g;
(3)流延薄膜制备:将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B。其中,料筒温度为290~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.35mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压。平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~40min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向2.5~3倍拉伸,横向1.2~1.8倍拉伸,拉伸温度为150~180℃,最终制得多层微孔薄膜。
拉伸后制得厚度为0.5mm的PET微孔薄膜,其泡孔直径为10~30µm,泡孔密度为109~1011个/cm3,为白色不透明薄膜,经测试对可见光的漫反射率达95%。
实施例6
(1)芯层料预混:PET(粉料、粒料)400~500g,液体润滑剂(液体石蜡、石油醚)50~200g,CaCO3(纳米级)50~100g;将树脂与液体润滑剂及CaCO3置于混料机中低速搅拌,20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:按比例称取PET粉料及苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3,滑石粉等一种或多种组成的组群,将称取物混合后置于混料机中低速搅拌,10~20min后取出,得到预混料B。按质量分数计算,所用比例为:PET 100~120g,抗紫外线剂0.01~0.02g;
(3)流延薄膜制备:将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B。其中,料筒温度为290~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.35mm;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压。平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,模压时间为10~40min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm;
(5)双向拉伸:用双向拉伸机把薄板A进行纵向2.5~3倍拉伸,横向1.2~2倍拉伸,拉伸温度为150~200℃,最终制得多层微孔薄膜。
拉伸后制得厚度为0.5mm的PET微孔薄膜,其泡孔直径为10~35µm,泡孔密度为109~1011个/cm3,为白色不透明薄膜,经测试对可见光的漫反射率达96%。
Claims (10)
1.一种多层微孔反射膜,其特征在于:所述的微孔反射膜为白色不透明的PET薄膜,薄膜本身为三层皮芯结构,上下两层为皮层,中间层为微孔芯层;所述薄膜厚度为0.5~1mm,微孔直径为5~50µm,微孔密度为109~1011个/cm3。
2.根据权利要求1所述的一种多层微孔反射膜,其特征在于:所述的PET的熔融指数为0.6~2.6g/10min。
3.根据权利要求1-2任意一项所述的一种多层微孔反射膜的制备方法,其特征在于:该方法的具体步骤为:
(1)芯层料预混:按重量比为(400~500)∶(50~200)∶(50~100)依次称取PET粉料或粒料、液体润滑剂及纳米级CaCO3,将三者置于混料机中低速搅拌20~30min后取出,称为预混料A;
(2)抗紫外线皮层料预混:称取PET粉料,按100重量份数PET加入0.01~0.02重量份数的比例加入抗紫外线剂,置于混料机中低速搅拌10~20min后取出,得到预混料B;
(3)流延薄膜制备:按(400~500)重量份的预混料A∶(100~130)重量份的预混料B的用量比,将预混料A、B分别投入双螺杆中,经模口挤出后流延成膜,分别制得流延膜A、B;
(4)多层薄片压制:裁剪长宽为30×10cm的流延膜,在底部铺一块流延膜B,然后依次铺入20块流延膜A,在流延膜A每层间涂入0.1~0.2g苯乙烯,在最上面一层铺上流延膜B,将此叠合的薄膜放入平板硫化机中进行热压;
(5)双向拉伸:用双向拉伸机把薄板A进行双向拉伸,最终制得多层微孔薄膜。
4.根据权利要求3所述的一种多层微孔反射膜的制备方法,其特征在于:所述液体润滑剂为液体石蜡或石油醚。
5.根据权利要求3所述的一种多层微孔反射膜的制备方法,其特征在于:步骤(2)中所述抗紫外线剂是3-(2)中苯基水杨酸酯、2-羟基-4-甲氧基二苯甲酮、2-(2’-羟基-2’-一叔丁基苯基)苯并三唑、ZnO、TiO2、CaCO3、滑石粉中的一种或多种的组合。
6.根据权利要求3所述的一种多层微孔反射膜的制备方法,其特征在于:步骤(3)中所述流延薄膜制备的参数是:料筒温度为280~330℃,模头温度为280~290℃,螺杆转速40~90转/分钟,所制的的流延膜A厚度为0.2~0.5mm,流延膜B厚度为0.3~0.4mm。
7.根据权利要求3所述的一种多层微孔反射膜的制备方法,其特征在于:步骤(3)中所述的双螺杆长径比为(33∶1)~(55∶1)。
8.根据权利要求6或7所述的一种多层微孔反射膜的制备方法,其特征在于:所述的双螺杆的控制温度范围为280~330℃;第一区温度设定范围为280~300℃,即将PET熔融;第二区温度设定为300~330℃,即将PET与其他原料充分混合;第三区温度设定为290~300℃,便于流延成膜。
9.根据权利要求3所述的一种多层微孔反射膜的制备方法,其特征在于:所述步骤(4)中,平板硫化机的温度为200~260℃,模压为0.1~0.6MPa,最大模压为0.63Mpa,模压时间为10~50min,压制的薄板称为薄板A,压制的薄板厚度为2~3mm。
10.根据权利要求3所述的一种多层微孔反射膜的制备方法,其特征在于:步骤(5)中所述双向拉伸机的拉伸倍数为1~3倍,其中,纵向进行1.5~3倍拉伸,横向进行1.2~2倍拉伸,拉伸温度为150~200℃。
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