CN116874861A - 一种抗静电改性聚酯薄膜及其制备方法 - Google Patents
一种抗静电改性聚酯薄膜及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种抗静电改性聚酯薄膜及其制备方法,包括抗静电聚酯膜层和抗静电涂覆层,所述抗静电涂覆层涂覆在抗静电聚酯膜层的两侧;抗静电聚酯膜层包括如下质量百分含量的组分:膜级聚酯切片70~90%、含氟聚酰亚胺8~25%,其余为助剂,总量为100%。本发明一方面通过在聚酯熔体中加入具有两亲性能的含氟聚酰亚胺共挤出,在聚酯分子中引入大量的极性官能团,从根本上改善了聚酯分子结构中极性基团密度低的缺陷,赋予聚酯薄膜本质抗静电属性;另一方面通过先制备聚酯膜层半成品,再在聚酯膜层表面涂覆抗静电涂层,最后再横向拉伸的方法,提高了抗静电涂覆层与聚酯膜层之间的结合强度,有利于提高抗静电涂覆层的稳固性和耐久性,提高抗静电性能。
Description
技术领域
本发明涉及薄膜制备技术领域,特别是涉及一种抗静电改性聚酯薄膜及其制备方法。
背景技术
PET薄膜、PBT薄膜和PEN薄膜是当前常用的聚酯薄膜产品,因其均具有尺寸稳定性高、机械强度高、光学特性佳等良好特征,在汽车、包装用材、光学设备和电器领域等都有广泛的应用。但众所周知,聚酯是绝缘材料,其表面电阻率通常在1012~1030Ω之间,因此,聚酯材料在加工或者使用过程中非常容易累积静电,尤其是对于薄膜产品而言,积累的静电会对被包装物品造成较大的损坏,如损害仪器仪表、电子敏感元件等,甚至会造成火灾爆炸等安全隐患。
现有技术中,解决聚酯薄膜抗静电性能的主要方法,一是对聚酯材料进行抗静电改性,如中国专利CN 111363319 B公开的一种抗菌抗静电聚酯薄膜,通过聚合原料的选择,制备具有抗静电结构的聚酯材料,再制备成膜;二是采用表面涂覆抗静电涂层的方法,如中国专利CN 111040219 B公开的一种防粘连抗静电聚酯薄膜,在聚酯薄膜的至少一个面上涂覆抗静电涂层。
但本申请发明人在实现本申请实施例中发明技术方案的过程中,发现上述技术至少存在如下技术问题:
前者不具有普适性,不能从根本上解决现有普通PET薄膜的抗静电性能差的问题,薄膜的生产受限了抗菌抗静电聚酯基体的制备;后者存在抗静电性能稳固性差的问题,且涂层后的薄膜表面硬度大,薄膜与涂层之间易脱离。
发明内容
本发明通过提供一种抗静电改性聚酯薄膜及其制备方法,解决了现有技术中聚酯薄膜在抗静电改性方面存在的上述问题。
为解决上述技术问题,本发明提供了一种抗静电改性聚酯薄膜,包括:抗静电聚酯膜层和抗静电涂覆层,所述抗静电涂覆层涂覆在所述抗静电聚酯膜层的两侧;其中,所述抗静电聚酯膜层包括如下质量百分含量的组分:膜级聚酯切片70~90%、含氟聚酰亚胺8~25%,其余为助剂,总量为100%。
在本发明一个较佳实施例中,所述助剂包括抗氧化剂或色母粒中的至少一种。
在本发明一个较佳实施例中,所述抗静电涂覆层包括如下质量百分含量的组分:(甲基)丙烯酸羟基酯10~15%、环氧丙烯酸树脂5~7%、导电物质2~4%、醇水混合物58~85%和乳化剂6~8%。
在本发明一个较佳实施例中,所述导电物质包括锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)。
在本发明一个较佳实施例中,所述锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)的质量比为1:1:3到1:2:5。
在本发明一个较佳实施例中,所述醇水混合物包括异丙醇、乙醇和去离子水;其中,所述异丙醇和乙醇为任意比例,所述异丙醇和乙醇与所述去离子水的质量比为1:10到1:30。
为解决上述技术问题,本发明还提供了一种抗静电改性聚酯弹性体薄膜的制备方法,包括如下步骤:
(1)配制抗静电溶液:按配方称取丙烯酸羟基酯、环氧丙烯酸树脂、醇水混合物和乳化剂混合均匀,然后加入导电物质继续混合分散均匀;
(2)制备抗静电聚酯膜层半成品:将配方量的膜级聚酯切片、助剂和含氟聚酰亚胺混合熔融后,所得的熔体通过静电附片的方式贴附到冷鼓表面进行铸片,所得铸片经牵引进入纵拉区进行纵向拉伸形成抗静电聚酯膜层半成品;
(3)制备抗静电聚酯薄膜:将步骤(1)中配置的抗静电溶液均匀涂覆在所述抗静电聚酯膜层半成品的两个表面上,并对涂覆后的薄膜区域进行横向拉伸,再经热定型,冷却,收卷得到所述抗静电改性聚酯薄膜。
在本发明一个较佳实施例中,所述铸片的厚度为200~500μm。
在本发明一个较佳实施例中,所述涂覆的车速为75~80m/min,单位面积涂布量为2.0~2.5克/平方米。
在本发明一个较佳实施例中,所述纵向拉伸的拉伸倍率为2.5~3.0,所述横向拉伸的拉伸倍率为横向拉伸倍率的1.2~1.5倍。
本发明的有益效果是:本发明一种抗静电改性聚酯薄膜及其制备方法,一方面通过在聚酯熔体中加入具有两亲性能的含氟聚酰亚胺共挤出,在聚酯分子中引入大量的极性官能团,从而从根本上改善了现有聚酯分子结构中极性基团密度低的缺陷,赋予聚酯薄膜本质抗静电属性;另一方面通过先制备聚酯膜层半成品,再在聚酯膜层表面涂覆抗静电涂层,最后再横向拉伸的方法,提高了抗静电涂覆层与聚酯膜层之间的结合强度,有利于提高抗静电涂覆层的稳固性和耐久性,提高抗静电性能。
附图说明
图1是本发明一种抗静电改性聚酯薄膜一较佳实施例1的立体结构示意图;
图2是本发明一种抗静电改性聚酯薄膜的制备方法的工艺流程示意图;
附图中各部件的标记如下:1.抗静电聚酯膜层,2.抗静电涂覆层。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域技术人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
请参阅图1和图2,本发明实施例包括:
实施例1
本发明公开了一种抗静电改性聚酯薄膜,包括:抗静电聚酯膜层1和抗静电涂覆层2,所述抗静电涂覆层2涂覆在所述抗静电聚酯膜层1的两侧。
具体地,所述抗静电聚酯膜层1包括如下质量百分含量的组分:膜级聚酯切片75%、含氟聚酰亚胺22%,抗氧化剂10103%。
由于含氟聚酰亚胺具有亲水和亲油的两亲特性,通过含氟聚酰亚胺的添加使用,利用其亲水基团与聚酯分子结合,实现在聚酯膜层中引入大量的极性基团,从而从根本上解决现有聚酯分子中极性基团密度低导致的导电性能差的问题。
所述抗静电涂覆层包括如下质量百分含量的组分:(甲基)丙烯酸羟基酯12%、环氧丙烯酸树脂6%、导电物质3%、醇水混合物72%和乳化剂7%。
具体地,所述(甲基)丙烯酸羟基酯为(甲基)丙烯酸-2-羟丙酯。
所述导电物质包括质量比为1:1:3的锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)。
所述醇水混合物包括异丙醇、乙醇和去离子水;其中,所述异丙醇和乙醇以1:1的质量比混合,所述异丙醇和乙醇与所述去离子水的质量比为1:20。
上述抗静电改性聚酯弹性体薄膜的制备方法,具体步骤如下:
(1)配制抗静电溶液:按上述用量,分别称取(甲基)丙烯酸-2-羟丙酯、环氧丙烯酸树脂、醇水混合物和乳化剂混合均匀,然后加入质量比为1:1:3的锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)作为导电物质,继续搅拌混合至分散均匀;
(2)制备抗静电聚酯膜层半成品:按上述用量,先将充分干燥的膜级聚酯切片、抗氧化剂和含氟聚酰亚胺加入双螺杆挤出机中,然后在275℃下熔融、抽真空,再通过精度为15um的过滤器过滤,过滤后的熔体通过头模挤出后,通过静电附片的方式贴附到冷鼓表面进行铸片,得到厚度为500μm的铸片,将所得铸片牵引进入纵拉区,控制纵向拉伸的倍率为2.8下进行纵向拉伸,得到抗静电聚酯膜层半成品;
(3)制备抗静电聚酯薄膜:将步骤(1)中配置的抗静电溶液采用离线涂布工艺涂覆在步骤(2)中制备的抗静电聚酯膜层半成品的两侧,控制涂覆的车速为80m/min,单位面积涂布量为2.0克/平方米,对于涂覆后的薄膜再在横向拉伸倍率为纵向拉伸倍率的1.5倍的条件下进行横向拉伸,最后经热定型,冷却,收卷得到所述抗静电改性聚酯薄膜。
实施例2
本发明公开了一种抗静电改性聚酯薄膜,包括:抗静电聚酯膜层1和抗静电涂覆层2,所述抗静电涂覆层2涂覆在所述抗静电聚酯膜层1的两侧。
具体地,所述抗静电聚酯膜层1包括如下质量百分含量的组分:膜级聚酯切片80%、含氟聚酰亚胺17%,抗氧化剂10103%。
由于含氟聚酰亚胺具有亲水和亲油的两亲特性,通过含氟聚酰亚胺的添加使用,利用其亲水基团与聚酯分子结合,实现在聚酯膜层中引入大量的极性基团,从而从根本上解决现有聚酯分子中极性基团密度低导致的导电性能差的问题。
所述抗静电涂覆层包括如下质量百分含量的组分:(甲基)丙烯酸羟基酯15%、环氧丙烯酸树脂5%、导电物质4%、醇水混合物70%和乳化剂6%。
其中,所述导电物质包括质量比为1:2:5的锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)。
所述醇水混合物包括异丙醇、乙醇和去离子水;其中,所述异丙醇和乙醇的质量比为1:1,所述异丙醇和乙醇与所述去离子水的质量比为1:30。
上述抗静电改性聚酯弹性体薄膜的制备方法,具体步骤如下:
(1)配制抗静电溶液:按上述用量,分别称取(甲基)丙烯酸-2-羟丙酯、环氧丙烯酸树脂、醇水混合物和乳化剂混合均匀,然后加入质量比为1:2:5的锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)作为导电物质,继续搅拌混合至分散均匀;
(2)制备抗静电聚酯膜层半成品:按上述用量,先将充分干燥的膜级聚酯切片、抗氧化剂和含氟聚酰亚胺加入双螺杆挤出机中,然后在275℃下熔融、抽真空,再通过精度为15um的过滤器过滤,过滤后的熔体通过头模挤出后,通过静电附片的方式贴附到冷鼓表面进行铸片,得到厚度为500μm的铸片,将所得铸片牵引进入纵拉区,控制纵向拉伸的倍率为2.8下进行纵向拉伸,得到抗静电聚酯膜层半成品;
(3)制备抗静电聚酯薄膜:将步骤(1)中配置的抗静电溶液采用离线涂布工艺涂覆在步骤(2)中制备的抗静电聚酯膜层半成品的两侧,控制涂覆的车速为80m/min,单位面积涂布量为2.0克/平方米,对于涂覆后的薄膜再在横向拉伸倍率为纵向拉伸倍率的1.5倍的条件下进行横向拉伸,最后经热定型,冷却,收卷得到所述抗静电改性聚酯薄膜。
对比例1
与实施例1相比,所述聚酯膜片中含有质量百分含量为97%的膜级聚酯切片和3%的抗氧化剂1010。
对比例2
与实施例1相比,所述抗静电改性聚酯薄膜的膜层两侧没有喷涂抗静电涂覆层。
对比例3
与实施例1相比,所述抗静电改性聚酯弹性体薄膜的制备方法为:
(1)配制抗静电溶液:按上述用量,分别称取(甲基)丙烯酸-2-羟丙酯、环氧丙烯酸树脂、醇水混合物和乳化剂混合均匀,然后加入质量比为1:2:5的锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)作为导电物质,继续搅拌混合至分散均匀;
(2)制备抗静电聚酯膜层:按上述用量,先将充分干燥的膜级聚酯切片、抗氧化剂和含氟聚酰亚胺加入双螺杆挤出机中,然后在275℃下熔融、抽真空,再通过精度为15um的过滤器过滤,过滤后的熔体通过头模挤出后,通过静电附片的方式贴附到冷鼓表面进行铸片,得到厚度为500μm的铸片,将所得铸片先后牵引进入纵拉区和横拉区进行双向拉伸,控制纵向拉伸的拉伸倍率为2.8,横向拉伸的拉伸倍率为纵向拉伸倍率的1.5倍;
(3)制备抗静电聚酯薄膜:将步骤(1)中配置的抗静电溶液采用离线涂布工艺涂覆在步骤(2)中制备的抗静电聚酯膜层的两侧,控制涂覆的车速为80m/min,单位面积涂布量为2.0克/平方米,最后经热定型,冷却,收卷得到所述抗静电改性聚酯薄膜。
将实施例1-2和对比例1-3中制备的抗静电改性聚酯薄膜进行性能测试,结果如下表1所示。
表1
上表1中的数据表明:本发明制备的抗静电改性聚酯薄膜不仅表面电阻低,而且经水浸泡或长时间久放后,其表面电阻的增加量不大,表明具有优异的抗静电性能和抗静电持久性。由对比例1和实施例1的数据对比可知,仅进行表面抗静电涂覆处理,所得的抗静电改性聚酯薄膜成膜时的表明电阻高于实施例1,且其表面电阻的耐久性差,尤其是耐水性能。由对比例1、2和实施例1的对比可知,表面涂覆抗静电涂层对成膜时抗静电性能的降低更为明显,但是抗静电的耐久性差。由对比例1和实施例1的数据对比可知,本发明通过先纵向拉伸,再涂覆抗静电涂层,最后进行横向拉伸的工艺方法,有助于提高抗静电涂覆层与膜层之间的结合强度,有助于提高抗静电涂层的耐久性。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。
Claims (10)
1.一种抗静电改性聚酯薄膜,其特征在于,包括:抗静电聚酯膜层和抗静电涂覆层,所述抗静电涂覆层涂覆在所述抗静电聚酯膜层的两侧;其中,所述抗静电聚酯膜层包括如下质量百分含量的组分:膜级聚酯切片70~90%、含氟聚酰亚胺8~25%,其余为助剂,总量为100%。
2.根据权利要求1所述的一种抗静电改性聚酯薄膜,其特征在于,所述助剂包括抗氧化剂或色母粒中的至少一种。
3.根据权利要求1所述的一种抗静电改性聚酯薄膜,其特征在于,所述抗静电涂覆层包括如下质量百分含量的组分:(甲基)丙烯酸羟基酯10~15%、环氧丙烯酸树脂5~7%、导电物质2~4%、醇水混合物58~85%和乳化剂6~8%。
4.根据权利要求3所述的一种抗静电改性聚酯薄膜,其特征在于,所述导电物质包括锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)。
5.根据权利要求4所述的一种抗静电改性聚酯薄膜,其特征在于,所述锑掺杂二氧化锡纳米粉体、纳米AZO粉体和聚(3-甲基噻吩)的质量比为1:1:3到1:2:5。
6.根据权利要求3所述的一种抗静电改性聚酯薄膜,其特征在于,所述醇水混合物包括异丙醇、乙醇和去离子水;其中,所述异丙醇和乙醇为任意比例,所述异丙醇和乙醇与所述去离子水的质量比为1:10到1:30。
7.一种如权利要求4-6任一项所述的抗静电改性聚酯薄膜的制备方法,其特征在于,包括如下步骤:
(1)配制抗静电溶液:按配方称取丙烯酸羟基酯、环氧丙烯酸树脂、醇水混合物和乳化剂混合均匀,然后加入导电物质继续混合分散均匀;
(2)制备抗静电聚酯膜层半成品:将配方量的膜级聚酯切片、助剂和含氟聚酰亚胺混合熔融后,所得的熔体通过静电附片的方式贴附到冷鼓表面进行铸片,所得铸片经牵引进入纵拉区进行纵向拉伸形成抗静电聚酯膜层半成品;
(3)制备抗静电聚酯薄膜:将步骤(1)中配置的抗静电溶液均匀涂覆在所述抗静电聚酯膜层半成品的两个表面上,并对涂覆后的薄膜区域进行横向拉伸,再经热定型,冷却,收卷得到所述抗静电改性聚酯薄膜。
8.根据权利要求7所述的一种抗静电改性聚酯薄膜的制备方法,其特征在于,所述铸片的厚度为200~500μm。
9.根据权利要求7所述的一种抗静电改性聚酯薄膜的制备方法,其特征在于,所述涂覆的车速为75~80m/min,单位面积涂布量为2.0~2.5克/平方米。
10.根据权利要求7所述的一种抗静电改性聚酯薄膜的制备方法,其特征在于,所述纵向拉伸的拉伸倍率为2.5~3.0,所述横向拉伸的拉伸倍率为横向拉伸倍率的1.2~1.5倍。
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