CN116515144A - 一种双面电晕双面防静电的吹塑聚乙烯膜和包装袋及其生产工艺和机组 - Google Patents
一种双面电晕双面防静电的吹塑聚乙烯膜和包装袋及其生产工艺和机组 Download PDFInfo
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Abstract
本发明涉及一种双面电晕双面防静电的吹塑聚乙烯膜及其生产工艺和机组,通过原料的选择和含量调控,发现该特定含量的聚乙烯膜可以通过吹塑方法制备,并且在25‑250μm厚度下可以进行双面电晕而不会被击穿,并且不需要胶黏剂可以直接在双面电晕后涂布防静电剂层,从而成为一种双面防静电的保护膜,并且该膜不受环境影响,不受湿度影响,耐潮湿,耐高温,不残胶,基材和产品之间具有吸附力,吸附力高达5kgf/m2,且在剥离时不会残胶;采用该双面电晕双面防静电的吹塑聚乙烯膜保护膜作为内膜制备的包装袋,经过振动测试,包装袋的表面没有任何污渍,没有静电材料的析出。
Description
技术领域
本发明涉及保护膜领域,具体涉及一种双面电晕双面防静电的吹塑聚乙烯膜及由其制备的包装袋,以及生产工艺和机组。
背景技术
电子电器类产品在搬运或者生产使用过程中,其表面极易受到接触性污染或者产生磨痕划伤,需使用保护膜对其表面进行覆盖使之免于受污或者受损,对电子电器类产品的表面提供保护。此外,电子行业所用的保护膜还必须具有高洁净度及抗静电性。
然而传统的吹塑膜只能在吹塑膜的外侧做电晕处理,再涂布静电剂涂层,现有技术只能做到对吹塑膜的一面防静电的效果。而在实践中,在保护膜从产品表面剥离时,或在产品移动过程中发生摩擦时极易产生静电,从而导致电子产品受损或者受污,并且剥离时还会残胶,污染产品表面。
因此需要一种防静电效果好且不会残胶的吹塑保护膜来更好地保护电子电器类产品。
发明内容
针对现有技术的不足,本发明提供了一种双面电晕双面防静电的吹塑聚乙烯膜保护膜及由其制备的包装袋,以及生产工艺和机组,该聚乙烯双面防静电保护膜有效解决了目前单面防静电保护膜无法解决的搬运摩擦时或者胶层剥离时产生静电以及残胶,从而使电子产品受损或者受污的问题。同时保护膜表面无静电材料迁移现象,具有防止静电损伤及防止灰尘和杂质吸附作用,防静电效果持久稳定;采用该双面电晕双面防静电的吹塑聚乙烯膜保护膜作为内膜制备的包装袋,包装袋的外膜为金属膜层,该包装袋用于包装产品,经过测试,包装袋在高温高湿环境下(65℃,湿度90%,72h),经过振动测试,包装袋的表面没有任何污渍,没有静电材料的析出。
为达到上述目的,本发明所提供的双面电晕双面防静电的吹塑聚乙烯膜及其生产方法,是通过以下技术方案实现的:
一种双面电晕双面防静电的吹塑聚乙烯膜,聚乙烯膜基材由LDPE、POE、LLDPE、茂金属聚乙烯、HDPE组成,原料组成按质量百分比为:LDPE50-75%,POE3-10%,茂金属聚乙烯10-35%,LLDPE2-10%,HDPE10-25%。
优选地,所述吹塑聚乙烯膜基材层的双面都具有防静电涂层。
优选地,所述防静电涂层为水性抗静电剂,与上述特定原料获得的聚乙烯膜表面的结合性好,不容易受湿度影响,双面电晕双面防静电的吹塑聚乙烯膜可以获得稳定的表面电阻数值在3*104-1*105Ω/□之间,当湿度小时,表面电阻值依然良好可达标准,起到抗静电效果。
优选地,所述防静电涂层厚度为300-2000nm。
优选地,所述防静电涂层中导电聚合物的添加比例为所述防静电层质量的0.5-5%。
优选地,所述聚乙烯基材的厚度为25-250μm,透光率大于92%,雾度小于7%。进一步,聚乙烯基材的厚度为50-200μm,更进一步,聚乙烯基材的厚度为120-150μm。
其中LDPE的质量百分比为50-75%,优选地,LDPE的质量百分比为65-70%,LDPE的含量太少影响保护膜的透明性,LDPE的含量太多了对于电晕则不耐受,容易被电晕击穿,进一步的,LDPE优选为68-70%;
POE的质量百分比为3-10%,优选地,POE的质量百分比为5-8%,供足够的粘结力和刚性,明显提升聚乙烯基材层的内聚强度,赋予其一定的附着力、粘性、摩擦性和韧性。含量过少附着力太弱,含量过高则导致薄膜失去柔韧性。
茂金属聚乙烯的质量百分比为10-35%,优选地,其中茂金属的质量百分比为20-30%,茂金属聚乙烯含量影响保护膜的耐击穿性,含量太少对于电晕则不耐受,容易被电晕击穿,含量太多影响吹塑膜的整体密度;
LLDPE的质量百分比为2-10%,优选地,其中LLDPE的质量百分比为5-8%,LLDPE的太少了影响拉伸性,太多了会导致膜失去挺度;
HDPE的质量百分比为10-25%,优选地,其中HDPE的质量百分比为15-20%,HDPE的含量影响膜的耐高温和耐击穿性,太少了膜不耐高温,容易被击穿,含量太高则影响膜的透光性;
吹塑聚乙烯膜基材层的双面都具有防静电涂层。所述防静电涂层为水性抗静电剂,与上述特定原料获得的聚乙烯膜表面的结合性好,不容易受湿度影响,可以得出稳定的表面电阻数值,当湿度小时,表面电阻值依然良好可达标准,起到抗静电效果。所述防静电涂层厚度为300-2000nm。所述防静电涂层中导电聚合物的添加比例为所述防静电层质量的0.5-5%。所述聚乙烯基材的厚度为25-250μm,透光率大于92%,雾度小于7%。进一步,聚乙烯基材的厚度为50-200μm,更进一步,聚乙烯基材的厚度为120-150μm。
其中具体的,LDPE:扬子石化-巴斯夫有限责任2426H,POE:陶氏ENGAGETM8003,LLDPE:埃克森美孚1002AY,茂金属聚乙烯:韩国大林XP9000、HDPE:扬子石化4000F。
为了防止静电,将防静电涂层涂布至聚乙烯保护膜基材的两侧。抗静电剂包括导电聚合物,离子液体。导电聚合物可选自:聚乙烯二氧噻吩(PEDOT)、聚噻吩亚乙烯基、聚(对苯撑硫醚)、聚醚酯酰胺中的一种或多种。其中聚醚酯酰胺包括一个或多个亲水性嵌段和疏水性嵌段,包括聚醚酯酰胺的抗静电剂涂层与聚乙烯基材膜的相容性极高,渗出或流动性极小,因此无需使用其他的添加剂,并且具有期望的抗静电效果。
其中,离子液体可选自,1-丙烯酰氧基己基-3-乙基咪唑-溴(AHEIm-Br)盐、1-乙基-3-甲基咪唑硫酸乙酯盐、N-己基吡啶六氟磷酸盐、N-丁基-N-甲基吡咯溴盐、N-丁基吡咯六氟磷酸盐、N-甲氧基乙基-N-甲基二乙基铵四氟硼酸盐、1-乙基-3-甲基咪唑四氟硼酸盐等中的一种或多种。
聚乙烯基材层和防静电涂层之间的粘合性优异,并且表面电阻和抗静电性能如剥离电荷优异。通过对聚乙烯基材进行双面电晕处理,使得基材膜与防静电涂层之间具有优异的层间粘合性,可以确保优异的层间粘附性。
优选的,本申请的聚乙烯基材电晕后,电晕值在43-48达因,进一步优选48达因,电晕高频放电过程中电子对和离子对撞击聚乙烯基材表面,使其表面产生带电离子,同时也使环境分子发生离子化,然后与聚乙烯基材表面的分子反应生成羟基、羧基和烷氧基等多种极性基团,这些极性基团和聚乙烯基材表面的带电离子使聚乙烯基材表面的极性大大增加,因此可采用水性静电剂涂覆,并将抗静电剂分子牢牢的固定在聚乙烯基材表面。
本发明还提供了一种采用该双面电晕双面防静电的吹塑聚乙烯膜保护膜作为内膜制备的包装袋,包装袋的外膜为金属膜层,金属膜层可以为铝膜层,铜膜层,银膜层,可基于外观需求设计金属图案,该包装袋用于包装产品,经过测试,包装袋在高温高湿环境下(65℃,湿度90%,72h),经过振动测试,包装袋的表面没有任何污染,没有粉尘吸附。
本发明还提供了一种双面电晕双面防静电的吹塑聚乙烯膜的生产方法,包括以下步骤:
(a)将上述聚乙烯膜基材的原料混合均匀后送入双螺杆挤出机进行加热融化;融化后的物料从吹塑机挤出,薄膜的吹胀比控制在2.5-5.0,吹胀牵引,吹胀牵引比控制在2.5-5.0,同时进行风环冷却;
(b)通过夹板把圆筒形的薄膜叠合为平面状;
(c)牵引,在牵引辊的牵引下,薄膜被纵向拉伸,牵引比控制在3-5;在牵引辊后两侧位置设置裁切刀;
(d)电晕,在吹塑膜被裁开后,立即用内侧的电晕装置对薄膜内侧进行电晕,随后再用外侧电晕装置对薄膜外侧进行电晕,电晕值为43-48达因;
(e)电晕处理后收卷,收卷后60-95分钟内,吹膜温度还未散去时,在45-55摄氏度范围内,清除聚乙烯基材表面杂质;
(f)再涂布防静电涂层,通过双烘道对内外双涂层进行烘干,第一个烘道的温度为80-100℃,第二烘道的温度为100-140℃,收卷。
优选地,在步骤(a)中,薄膜的吹胀比控制在3-4,吹胀牵引比控制在3-4。
优选地,在步骤(c)中,牵引比控制在4。优选地,在步骤(d)中,电晕值为48达因。
优选地,在步骤(f)中,第一个烘道的温度为95℃,第二烘道的温度为120℃。
本发明还提供了一种双面电晕双面防静电的吹塑聚乙烯膜的生产机组,按照前述的工艺流程包括:用于熔体熔融的挤出机、用于薄膜成型的挤出模头、用于牵引薄膜的第一牵引辊、用于裁切薄膜两侧的裁切刀,用于双面电晕的内电晕机和外电晕机,第一收卷辊,涂胶辊,双烘道,第二收卷辊。
本发明的有益效果是:本申请通过原料的选择和含量调控,发现该特定含量的聚乙烯膜可以通过吹塑方法制备,并且在25-250μm厚度下可以进行双面电晕而不会被击穿,并且不需要胶黏剂可以直接在双面电晕后涂布防静电涂层,从而成为一种双面防静电的保护膜,并且该膜不受环境影响,不受湿度影响,耐潮湿,耐高温,不残胶,并且因为内外层经过电晕,双面涂布水性静电剂层,水性静电剂的厚度很薄,基材和产品之间具有吸附力,吸附力高达5kgf/m2以上,并且本申请的双面抗静电保护膜的表面及内部的阻抗都处于较低水平,有利于静电的释放,因而在对应用到产品表面的保护膜撕除时不会产生过高的撕除电压,且在剥离时不会残胶。
附图说明
通过下面结合附图对其示例性实施例进行的描述,本发明上述特征和优点将会变得更加清楚和容易理解。
图1是本发明保护膜的工艺流程图。
图2是本发明的包装袋的振动测试图。
具体实施方式
实施例1:
本发明实施例提供了一种双面电晕双面防静电的吹塑聚乙烯膜,包括:基材层、内侧电晕层、外侧电晕层,所述基材层上下表面均设置有电晕层,聚乙烯膜基材由LDPE、POE、LLDPE、茂金属聚乙烯、HDPE组成,原料组成按质量百分比为:LDPE60%,POE5%,茂金属聚乙烯15%,LLDPE5%,HDPE15%,双面电晕达到48达因值,再双面涂布防静电涂层。
吹塑聚乙烯膜基材层的双面都具有防静电涂层。所述防静电层为水性抗静电剂,与上述特定原料获得的聚乙烯膜表面的结合性好,不容易受湿度影响,可以得出稳定的表面电阻数值,当湿度小时,表面电阻值依然良好可达标准,起到抗静电效果。所述防静电涂层厚度为800nm。所述防静电高分子的添加比例为所述防静电涂层质量的3%。所述聚乙烯基材的厚度为200μm,透光率大于92%,雾度小于7%。
其中具体的,LDPE:扬子石化-巴斯夫有限责任2426H,POE:陶氏ENGAGETM8003,LLDPE:埃克森美孚1002AY,茂金属聚乙烯:韩国大林XP900,HDPE:扬子石化4000F。
为了防止静电,将抗静电剂涂布至聚乙烯保护膜基材的两侧。抗静电剂层包括导电聚合物,离子液体。导电聚合物选自聚醚酯酰胺;离子液体选自1-丙烯酰氧基己基-3-乙基咪唑-溴(AHEIm-Br)盐。
上述实施例1的工作原理及有益效果为:本发明提供的一种双面电晕双面防静电的吹塑聚乙烯膜,通过原料的选择和含量调控,发现该特定含量的聚乙烯膜可以通过吹塑方法制备,并且在200μm厚度下可以进行双面电晕而不会被击穿,并且不需要胶黏剂可以直接在双面电晕后涂布静电剂层,从而成为一种双面防静电的保护膜,并且该膜不受环境影响,不受湿度影响,耐潮湿,耐高温,不残胶,并且因为内外层经过电晕,双面涂布水性静电剂层,水性静电剂的厚度很薄,保护膜和(电子电器)产品之间具有吸附力,例如用于电脑屏幕,吸附力高达5kgf/m2以上,并且本申请的双面抗静电保护膜的表面及内部的阻抗都处于较低水平,有利于静电的释放,因而在对应用到产品表面的保护膜撕除时不会产生过高的撕除电压,且在剥离时不会残胶。
实施例2:
一种采用实施例1中的该双面电晕双面防静电的吹塑聚乙烯膜保护膜作为内膜制备的包装袋,包装袋的外膜为金属膜层,金属膜层为铝膜层,该包装袋用于包装产品,经过测试,包装袋在高温高湿环境下(65℃,湿度90%,72h),经过振动测试,振动测试是将包装袋密封放入具有缓冲材料的瓦楞纸箱中,置于振动试验机中,参见附图2,在65℃,湿度90%下,以10Hz、上下方向为1G的加速度进行72小时的振动,再在无尘环境下打开包装袋,包装袋的表面没有任何污染,没有抗静电剂材料的析出,没有污渍吸附。
实施例3:
实施例1中的双面电晕双面防静电的吹塑聚乙烯膜的生产方法,包括以下步骤:
(a)将上述聚乙烯膜基材的原料混合均匀后送入双螺杆挤出机进行加热融化;融化后的物料从吹塑机挤出,薄膜的吹胀比控制在4,吹胀牵引,吹胀牵引比控制在4,同时进行风环冷却;
(b)通过夹板把圆筒形的薄膜叠合为平面状;
(c)牵引,在牵引辊的牵引下,薄膜被纵向拉伸,牵引比控制在4;在牵引辊后两侧位置设置裁切刀;
(d)电晕,在吹塑膜被裁开后,立即用内侧的电晕装置对薄膜内侧进行电晕,随后再用外侧电晕装置对薄膜外侧进行电晕,电晕值为48达因;
(e)电晕处理后收卷,收卷后80分钟内,吹膜温度还未散去时,在50摄氏度,清除聚乙烯基材表面杂质;
(f)再涂布防静电涂层,通过双烘道对内外双涂层进行烘干,第一个烘道的温度为95℃,第二烘道的温度为120℃,收卷。
其中,通过原料的选择和含量调控,发现该特定含量的聚乙烯膜可以通过吹塑方法制备,并且在200μm厚度下可以进行双面电晕而不会被击穿,并且不需要胶黏剂可以直接在双面电晕后涂布静电剂层,聚乙烯基材层和抗静电层之间的粘合性优异,并且表面电阻和抗静电性能如剥离电荷优异,从而成为一种双面防静电的保护膜,并且该膜不受环境影响,不受湿度影响,耐潮湿,耐高温,不残胶,并且因为内外层经过电晕,双面涂布水性静电剂层,水性静电剂的厚度很薄,基材和产品之间具有吸附力,吸附力5kgf/m2,并且本申请的双面抗静电保护膜的表面及内部的阻抗都处于较低水平,有利于静电的释放,因而在对应用到产品表面的保护膜撕除时不会产生过高的撕除电压,且在剥离时不会残胶。通过以上工艺获得的保护膜产品,不需要再再静电剂层的表面施加压敏胶或者其它胶黏剂层即可贴附于产品(电子电器)的表面,也可以再施加胶层,胶层与电晕后的聚乙烯基材的结合力非常强,并且剥离时胶层会牢牢吸附在基材层上,而不会残留在产品表面,以及本申请是一种双面电晕双面防静电的聚乙烯保护膜层,可用于产品与产品之间的保护膜,比单面的保护膜具有更好的应用前景,应用范围和场合更广,且节省成本。
实施例4:
用于实施例3的生产方法的一种双面电晕双面防静电的吹塑聚乙烯膜的生产机组,按照前述的工艺流程包括:用于熔体熔融的挤出机、用于薄膜成型的挤出模头、用于牵引薄膜的第一牵引辊、用于裁切薄膜两侧的裁切刀,用于双面电晕的内电晕机和外电晕机,第一收卷辊,涂胶辊,双烘道,第二收卷辊。
实施例5:
采用实施例3的制备工艺生产本申请的双面电晕双面防静电的吹塑聚乙烯膜,对其进行性能测试,双面电晕值均可达到48达因而不会被击穿,涂覆抗静电剂涂层后,薄膜的表面电阻为3*104Ω/□,且与产品表面不需要涂胶即可吸附,是非常优异的防静电材料。
实施例6:
采用实施例3的制备工艺生产本申请的双面电晕双面防静电的吹塑聚乙烯膜,对其进行性能测试,区别在于,通过减小电晕的电压,使得双面电晕值只有38达因,涂覆抗静电剂涂层后,薄膜的表面电阻为5*105Ω/□,且与产品表面吸附较弱,5分钟后有脱落倾向。
对比例1:
与实施例1相同,区别在于HDPE5%。聚乙烯基材在电晕处理时,无法获得43达因的电晕值,在38达因时薄膜已经出现烧焦痕迹,耐高温性差。
对比例2:
与实施例1相同,区别在于HDPE30%。薄膜的透光性差,影响使用。
对比例3:
与实施例1相同,区别在于LLDPE1%。聚乙烯基材在拉伸过程中出现断裂。
对比例4:
与实施例1相同,区别在于LLDPE15%。聚乙烯基材过于柔软,无法获得43达因的电晕值。
对比例5:
与实施例1相同,区别在于茂金属聚乙烯5%。电晕时聚乙烯基材被击穿。
对比例6:
与实施例1相同,区别在于茂金属聚乙烯45%。薄膜克重较大,影响使用。
对比例7:
与实施例1相同,区别在于POE0%。聚乙烯基材与静电剂涂层附着力太弱,无法获得有效涂层。
对比例8:
与实施例1相同,区别在POE20%。薄膜失去柔韧性。
对比例9:与实施例1相同,区别在于聚乙烯膜采用LDPE30%。保护膜的透明性较差,无法使用。
对比例10:
与实施例1相同,区别在于聚乙烯膜采用LDPE90%。聚乙烯基材被电晕击穿。
本发明所属领域的一般技术人员可以理解,本发明以上实施例仅为本发明的优选实施例之一,为篇幅限制,这里不能逐一列举所有实施方式,任何可以体现本发明权利要求技术方案的实施,都在本发明的保护范围内。
需要注意的是,以上内容是结合具体的实施方式对本发明所作的进一步详细说明,不能认定本发明的具体实施方式仅限于此,在本发明的上述指导下,本领域技术人员可以在上述实施例的基础上进行各种改进和变形,而这些改进或者变形落在本发明的保护范围内。
Claims (10)
1.一种双面电晕双面防静电的吹塑聚乙烯膜,其特征在于,聚乙烯膜基材由LDPE、POE、LLDPE、茂金属聚乙烯、HDPE组成,原料组成按质量百分比为:LDPE50-75%,POE3-10%,茂金属聚乙烯10-35%,LLDPE2-10%,HDPE10-25%。
2.根据权利要求1所述的所述双面电晕双面防静电的吹塑聚乙烯膜,其特征在于,吹塑聚乙烯膜基材层的双面都具有防静电涂层。
3.根据权利要求2所述的所述双面电晕双面防静电的吹塑聚乙烯膜,其特征在于,所述防静电涂层包括水性抗静电剂,所述防静电涂层厚度为300-2000nm。
4.根据权利要求1所述的所述双面电晕双面防静电的吹塑聚乙烯膜,其特征在于,所述聚乙烯基材的厚度为25-250μm,透光率大于92%,雾度小于7%。
5.根据权利要求1所述的所述双面电晕双面防静电的吹塑聚乙烯膜,其特征在于,聚乙烯基材的厚度为50-200μm。
6.一种包装袋,该包装袋的内膜由权利要求1所述的双面电晕双面防静电的吹塑聚乙烯膜制成,外膜为金属层。
7.根据权利要求1所述的双面电晕双面防静电的吹塑聚乙烯膜的生产方法,其特征在于,包括以下步骤:
(a)将上述聚乙烯膜基材的原料混合均匀后送入双螺杆挤出机进行加热融化;融化后的物料从吹塑机挤出,薄膜的吹胀比控制在2.5-5.0,吹胀牵引,吹胀牵引比控制在2.5-5.0,同时进行风环冷却;
(b)通过夹板把圆筒形的薄膜叠合为平面状;
(c)牵引,在牵引辊的牵引下,薄膜被纵向拉伸,牵引比控制在3-5;在牵引辊后两侧位置设置裁切刀;
(d)电晕,在吹塑膜被裁开后,立即用内侧的电晕装置对薄膜内侧进行电晕,随后再用外侧电晕装置对薄膜外侧进行电晕,电晕值为43-48达因;
(e)电晕处理后收卷,收卷后60-95分钟内,吹膜温度还未散去时,在45-55摄氏度范围内,清除聚乙烯基材表面杂质;
(f)再涂布防静电涂层,通过双烘道对内外双涂层进行烘干,第一个烘道的温度为80-100℃,第二烘道的温度为100-140℃,收卷。
8.根据权利要求7所述的生产方法,其特征在于,在步骤(a)中,薄膜的吹胀比控制在3-4,吹胀牵引比控制在3-4;在步骤(c)中,牵引比控制在4;在步骤(d)中,电晕值为48达因。
9.根据权利要求7所述的生产方法,其特征在于:第一个烘道的温度为95℃,第二烘道的温度为120℃。
10.用于权利要求7所述的生产方法的生产机组,按照工艺流程包括:用于熔体熔融的挤出机、用于薄膜成型的挤出模头、用于牵引薄膜的第一牵引辊、用于裁切薄膜两侧的裁切刀,用于双面电晕的内电晕机和外电晕机,第一收卷辊,涂胶辊,双烘道,第二收卷辊。
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