CN113459623A - 一种耐高温透明聚酯薄膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种耐高温透明聚酯薄膜及其制备方法,涉及聚酯薄膜技术领域,依序由上表层、芯层和下表层构成,所述芯层由以下重量百分比的原料组成:亚微米级玻璃纤维5‑10%、界面偶联剂0.1‑2.5%,聚酯87.5‑94.9%;所述上表层和下表层由以下重量百分比的原料组成:抗粘母料5‑10%、聚酯90‑95%。本发明制得的聚酯薄膜的透明性好、光泽度高,具有优良的机械性能、抗张强度和抗冲击强度、尺寸稳定、线性膨胀系数低,以及良好的耐化学药品性和耐油性,可广泛应用于包装、电子、光电、薄膜开关、面板及柔性显示基材等产品。
Description
技术领域
本发明涉及聚酯薄膜技术领域,尤其涉及一种耐高温透明聚酯薄膜及其制备方法。
背景技术
聚对苯二甲酸乙二醇酯(PET)薄膜具有优异的力学性能、较好的弹性、耐磨性和耐冲击性,吸水率低,尺寸稳定性佳等性能,但其耐热性较差,在受高温时热收缩率相对较大,不能满足电子产品行业等特殊加工领域对耐高温、低收缩的要求,薄膜容易产生变形、翘边而导致电子按键失灵的现象,因此能适用于简单的柔性印刷线路板(PCB),而较难应用于有零组件的柔性线路板(FPC板)及其他一些特定的高温环境。目前市场上耐高温薄膜一般使用价格昂贵的PI薄膜,其材料成本较高。
发明内容
基于背景技术存在的技术问题,本发明提出了一种耐高温透明聚酯薄膜及其制备方法,在不影响薄膜光学性能的基础上,通过向芯层中添加亚微米级玻璃纤维并使其均匀分散到聚酯分子中,抑制薄膜在高温环境中的收缩、变形。
本发明提出的一种耐高温透明聚酯薄膜,依序由上表层、芯层和下表层构成,所述芯层由以下重量百分比的原料组成:亚微米级玻璃纤维5-10%、界面偶联剂0.1~2.5%,聚酯87.5-94.9%;
所述上表层和下表层由以下重量百分比的原料组成:抗粘母料5-10%、聚酯90-95%。
在本发明中,芯层中亚微米级玻璃纤维含量应控制在5-10%,过高会影响薄膜的光学性能且造成生产不稳定,过低则薄膜耐热性提高不明显。
在本发明中,上、下表层的成分相同。
玻璃纤维的耐温性好、受热变形率低,本发明通过将亚微米级玻璃纤维均匀分散到聚酯分子中,抑制薄膜在高温环境中收缩、变形;且合理控制添加量对薄膜光学性能无影响。
优选地,所述亚微米级玻璃纤维的纤维直径为0.2μm,纤维长度为10-15μm。
优选地,所述界面偶联剂为乙烯基三乙氧基硅烷、甲基丙烯酸氯化铬盐、钛酸四丁酯中的一种或几种;优选地,为乙烯基三乙氧基硅烷和甲基丙烯酸氯化铬盐按照1:1的重量比组成的混合物,或为乙烯基三乙氧基硅烷和钛酸四丁酯按照1:1的重量比组成的混合物。
优选地,所述聚酯为聚酯PEN和/或聚酯PET;优选地,芯层中,聚酯为聚酯PET切片;上表层和下表层中,聚酯为聚酯PEN切片和聚酯PET切片按照23-40:60-77的重量百分比组成的。
在本发明中,由于聚酯PEN分子结构中含有刚性更大的萘环,所以其玻璃化转变温度、结晶温度和熔点均比PET高,将其与PET复配能进一步提高其耐高温性能;但应控制上、下表层中聚酯PEN和聚酯PET之间的重量比,若聚酯PEN过高,芯层与表层相容性变差,容易在使用过程中发生薄膜剥离的现象,同时薄膜透明度降低,也导致薄膜成本提高。
优选地,所述聚酯PEN特性粘度在0.50-0.60dl/g,聚酯PET特性粘度在0.60-0.62dl/g。
优选地,所述抗粘母料的有效抗粘粒子为玻璃微珠、聚甲基丙烯酸甲酯真球微粒的一种或两种混合,粒径为2.0μm。
优选地,所述薄膜厚度为15~50μm;上表层和下表层厚度各占薄膜厚度的12-14%。
本发明还提出了上述耐高温透明聚酯薄膜的制备方法,包括以下步骤:
S1、芯层材料制备:将亚微米玻璃纤维和聚酯切片分别干燥,然后将聚酯切片磨成粉状;将亚微米玻璃纤维和界面偶联剂混合,然后再与粉状界面偶联剂混合,得芯层材料;
S2、膜片制备:将上表层和下表层的各原料及芯层材料分别加入到双螺杆挤出机中熔融,然后输送到三层结构模头中汇合挤出,得膜片;
S3、薄膜制备:将膜片经铸片、纵拉、横拉、牵引、收卷制成产品膜。
优选地,所述芯层材料的挤出机温度设定为275-280℃,上表层材料和下表层材料的挤出机温度分别设定为285-290℃。
优选地,所述纵拉、横拉分别以4.0-5.0的倍率进行双轴拉伸,横拉定型温度设定为245-250℃。
在本发明中,上述薄膜雾度≤2.0%,150℃、30min下的纵向热收缩率≤1.0%,横向向热收缩率≤0%,为达到上述热收缩率,横拉热定型温度优选245-250℃。
与现有技术相比,本发明的有益效果体现在以下几个方面:
1.本发明通过将亚微米级玻璃纤维均匀分散到芯层的聚酯分子中,抑制薄膜在高温环境中的收缩、变形;且合理控制添加量对薄膜光学性能无影响。
2.本发明在薄膜表层添加一定比例的PEN材料,采用聚酯PEN与聚酯PET复配,进一步提高PET的耐温性能;且合理控制PEN的用量,各层之间相容性较好,制备的薄膜不仅耐温性能优异,具有较低的热收缩率,同时光学性能良好,可适用于一些高温加工环境。
3.本发明采用多层共挤工艺,制得的聚酯薄膜的透明性好、光泽度高,具有优良的机械性能、抗张强度和抗冲击强度、尺寸稳定、线性膨胀系数低,以及良好的耐化学药品性和耐油性,可广泛应用于包装、电子、光电、薄膜开关、面板及柔性显示基材等产品。
本发明薄膜在加工时耐受短时高温而不变形,特别适合作为柔性线路板FPC的基材及其他一些高温加工环境。
具体实施方式
下述实施例中,所述亚微米级玻璃纤维的纤维直径为0.2μm,纤维长度为10-15μm;所述聚酯PEN特性粘度在0.50-0.60dl/g,聚酯PET特性粘度在0.60-0.62dl/g;
下面,通过具体实施例对本发明的技术方案进行详细说明。
实施例1
本发明提出的一种耐高温透明聚酯薄膜,其厚度为15μm,包括聚酯芯层和层叠于聚酯芯层表面的上表层和下表层,其中上、下表层的厚度分别为薄膜厚度的12%;
芯层由以下重量百分比的原料制成:亚微米级玻璃纤维5%、界面偶联剂0.1%,PET切片94.9%;其中,界面偶联剂为乙烯基三乙氧基硅烷和甲基丙烯酸氯化铬盐按照1:1的重量比组成的混合物;
上、下表层成分相同,由以下重量百分比的原料组成:抗粘母料5%、PET切片65%、PEN切片30%;其中,抗粘母料的有效抗粘粒子为玻璃微珠,粒径为2.0μm。
上述聚酯薄膜的制备方法如下:
1、芯层材料制备:将亚微米玻璃纤维在250℃加热干燥,控制干燥后的纤维含水量为0.05%以下;通过混合机将固体状态下的纤维材料与粉状界面偶联剂均匀混合;将PET切片在160℃加热干燥,控制干燥后的含水量为0.05%以下;将干燥后的PET切片磨成粉状,再与带界面偶联剂的亚微米级纤维材料均匀混合;
2、表层材料制备:将PET切片、PEN材料、抗粘母料混合;
3、薄膜制备:将芯层材料及上、下表层材料分别送入双螺杆挤出机熔融,芯层挤出机温度设定275℃,表层挤出机温度设定285℃,输送到模头混合挤出,模头温度设定280℃,再经过铸片、纵拉、横拉,纵横拉拉伸倍率4.0-5.0倍,最后经过牵引、收卷制成产品膜。
实施例2
本发明提出的一种耐高温透明聚酯薄膜,其厚度为30μm,包括聚酯芯层和层叠于聚酯芯层表面的上表层和下表层,其中上、下表层的厚度分别为薄膜厚度的13%;
芯层由以下重量百分比的原料制成:亚微米级玻璃纤维8%、界面偶联剂1.5%,PET切片90.5%;其中,界面偶联剂为乙烯基三乙氧基硅烷和甲基丙烯酸氯化铬盐按照1:1的重量比组成的混合物;
上、下表层成分相同,由以下重量百分比的原料组成:抗粘母料8%、PET切片70%、PEN切片22%;其中,抗粘母料的有效抗粘粒子为聚甲基丙烯酸甲酯真球微粒,粒径为2.0μm。
上述聚酯薄膜的制备方法如同实施例1。
实施例3
本发明提出的一种耐高温透明聚酯薄膜,其厚度为50μm,包括聚酯芯层和层叠于聚酯芯层表面的上表层和下表层,其中上、下表层的厚度分别为薄膜厚度的14%;
芯层由以下重量百分比的原料制成:亚微米级玻璃纤维10%、界面偶联剂2.5%,PET切片87.5%;其中,界面偶联剂为乙烯基三乙氧基硅烷和钛酸四丁酯按照1:1的重量比组成的混合物;
上、下表层成分相同,由以下重量百分比的原料组成:抗粘母料10%、PET切片60%、PEN切片30%;其中,抗粘母料的有效抗粘粒子为玻璃微珠,粒径为2.0μm。
上述聚酯薄膜的制备方法同实施例1。
对实施例1-3的性能进行检测,并采用市售普通BOPET薄膜(安徽国风塑业、PET-15μm)作为对比例进行对比。检测结果如表1所述。
表1 实施例1-3和对比例的BOPET薄膜的性能检测数据
根据表1中结果所示,本发明制备的BOPET薄膜显著提高薄膜耐温性能的同时,薄膜光学性能良好。
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 (10)
1.一种耐高温透明聚酯薄膜,依序由上表层、芯层和下表层构成,其特征在于,所述芯层由以下重量百分比的原料组成:亚微米级玻璃纤维5-10%、界面偶联剂0.1~2.5%,聚酯87.5-94.9%;
所述上表层和下表层由以下重量百分比的原料组成:抗粘母料5-10%、聚酯90-95%。
2.根据权利要求1所述的耐高温透明聚酯薄膜,其特征在于,所述亚微米级玻璃纤维的纤维直径为0.2μm,纤维长度为10-15μm。
3.根据权利要求1所述的耐高温透明聚酯薄膜,其特征在于,所述界面偶联剂为乙烯基三乙氧基硅烷、甲基丙烯酸氯化铬盐、钛酸四丁酯中的一种或几种;优选地,为乙烯基三乙氧基硅烷和甲基丙烯酸氯化铬盐按照1:1的重量比组成的混合物,或为乙烯基三乙氧基硅烷和钛酸四丁酯按照1:1的重量比组成的混合物。
4.根据权利要求1所述的耐高温透明聚酯薄膜,其特征在于,所述聚酯为聚酯PEN和/或聚酯PET;优选地,芯层中,聚酯为聚酯PET切片;上表层和下表层中,聚酯为聚酯PEN切片和聚酯PET切片按照23-40:60-77的重量百分比组成的。
5.根据权利要求4所述的耐高温透明聚酯薄膜,其特征在于,所述聚酯PEN特性粘度在0.50-0.60dl/g,聚酯PET特性粘度在0.60-0.62dl/g。
6.根据权利要求1所述的耐高温透明聚酯薄膜,其特征在于,所述抗粘母料的有效抗粘粒子为玻璃微珠、聚甲基丙烯酸甲酯真球微粒的一种或两种混合,粒径为2.0μm。
7.根据权利要求1所述的耐高温透明聚酯薄膜,其特征在于,所述薄膜厚度为15~50μm;上表层和下表层厚度各占薄膜厚度的12-14%。
8.一种如权利要求1-7任一项所述的耐高温透明聚酯薄膜的制备方法,其特征在于,包括以下步骤:
S1、芯层材料制备:将亚微米玻璃纤维和聚酯切片分别干燥,然后将聚酯切片磨成粉状;将亚微米玻璃纤维和界面偶联剂混合,然后再与粉状界面偶联剂混合,得芯层材料;
S2、膜片制备:将上表层和下表层的各原料及芯层材料分别加入到双螺杆挤出机中熔融,然后输送到三层结构模头中汇合挤出,得膜片;
S3、薄膜制备:将膜片经铸片、纵拉、横拉、牵引、收卷制成产品膜。
9.根据权利要求8所述的耐高温透明聚酯薄膜的制备方法,其特征在于,所述芯层材料的挤出机温度设定为275-280℃,上表层材料和下表层材料的挤出机温度分别设定为285-290℃。
10.根据权利要求8所述的耐高温透明聚酯薄膜的制备方法,其特征在于,所述纵拉、横拉分别以4.0-5.0的倍率进行双轴拉伸,横拉定型温度设定为245-250℃。
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