CN113619059A - 一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺 - Google Patents
一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺 Download PDFInfo
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Abstract
本发明公开了一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺。该抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,采用平挤上吹设备,制备出高性能多层复合氟膜;多层复合氟膜,利用多层结构的优势,最外层氟树脂(或改性氟树脂)耐高低温、耐紫外老化、耐摩擦、耐腐蚀、阻隔水;粘结层链接氟树脂与阻气层,起到良好粘结性能;阻气层采用高性能未改性(或改性)的阻隔材料;三者有机统一制备的多层复合薄膜,采用薄膜吹塑工艺,使含氟树脂复合膜薄膜内高分子横向与纵向呈现有序排列;进一步提高了含氟树脂复合薄膜横向与纵向的耐磨性;改性后的氟树脂,对紫外线有反射或吸收,进一步提高了抗紫外线性能,也可作为临近空间飞艇的防护层或阻隔层。
Description
技术领域
本发明涉及高空气球技术领域,具体为一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺。
背景技术
现有技术主要以常规结构为主,例如:LLDPE的多层复合薄膜;特种PET等材料制备得到的氦气或氢气阻隔薄膜,主要应用在高空气球、临近空间浮空器的阻氦层等关键部位,常规结构:LLDPE/AD/EVOH/AD/LLDPE或特种PET单层;其他含有EVOH的薄膜,阻隔氦气或氢气,原理:多层或单层薄膜阻隔氦气原理均为薄膜内部细微结构的曲折通道阻隔气体分子。
但是其在实际使用时,仍旧存在一些缺点:LLDPE为线性低密度聚乙烯,材料的韧性比较好,但力学强度低,分子之间的力作用小,导致材料的热封、气体阻隔以及耐腐蚀等性能不佳,同时其耐紫外线程度明显较差,无法满足复杂环境下的长期使用。
发明内容
(一)解决的技术问题
针对现有技术的不足,本发明提供了一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,解决了薄膜材料耐腐蚀差的问题、耐高低温老化问题、力学强度低的问题、氦气或氢气阻隔差的问题、紫外老化的问题。
(二)技术方案
为实现上述目的,本发明提供如下技术方案:一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,包括以下步骤:
预制料:将氟树脂(改性氟树脂)与紫外线屏蔽剂(有机或无机类化合物)通过熔融共混的方式,均匀混合造粒。
S1、计量:将尼龙、聚乙烯、酸改性聚烯烃合成物、乙烯四氟乙烯聚合物等原辅材料,(其原辅材料均为颗粒状)通过人工手动加入至挤出机的料斗中,并按照特定比例进行自动计量与混合配比。
S2、干燥:对有吸湿倾向的高聚物,在进行加工之前,须要先进行干燥处理,干燥温度在80~150℃左右,干燥时间约4~24小时,干燥后的聚合物切片湿含量要求控制在50ppm以下。
S3、加料、添料及挤出:当挤出机和机头达到保温要求后(即:温度在220~310℃),启动挤出机,向料斗加入少量的原辅材料,开始时螺杆以低速转动,当熔融料通过机头并吹胀成管泡后,逐渐提高螺杆转速,同时把料加满,并采用定制的多层挤出设备将氟树脂与其他树脂相结合,制备出来多层共挤薄膜,与此同时采用冷却水对挤出机电机进行不间断的循环冷却,确保挤出机电机处于安全温度以内。
S4、过滤与除杂:为了去除熔体中可能存在的杂质、凝胶粒子、鱼眼等异物,常在熔体管线上计量泵的前后各安装一只过滤器,薄膜生产线通常采用碟状过滤器,其材料为不锈钢网与不锈钢烧结毡组合而成,不锈钢碟片的尺寸为Φ12英寸,过滤网孔径一般设置在10-30μ。
S5、混合与控温:在熔体原材料流过熔体管时,沿着管壁的熔体温度与熔体中心的温度由于距离的限制,从而导致其之间具有较大的温差,为使进入模头的熔体温度均匀一致,以保证模头出料均匀,须在熔体管连接模头的一端内部安装若干组静态混合器,熔体流过静态混合器时,会自动产生分—合—分—合的均匀混合作用,从而达到熔体机头约为210℃-310℃左右。
S6、定型:将熔融后的树脂,经挤出机内部挤出吹塑的机械力作用而进行纵向拉伸,同时经压缩空气吹胀进行横向拉伸,使多层复合膜吹胀成薄膜,然后经多层膜挤出机自带的多个挤出机共挤,经由同一个机头挤出;通过挤出机自带的风机配合位于机头的冷却环,对处于冷却线内的多层膜进行冷却、机械自动牵引、拉伸、定型、收卷后制成多层薄膜。
S7、剖开展平收卷与后续检验:经过多层膜挤出机自带的多辊轴对定型后的薄膜进行收卷,将定型好的薄膜经过多层膜挤出机自带切边设备进行裁边,通过展平机对裁边好的薄膜进行展平收卷。
S8、检验:将多层复合膜收卷前、后各裁剪若干个约5m长的样品,进行检验。
S9、包装入库:将检验后满足相关要求的与不满足相关要求的多层复合薄膜贴样签,满足相关要求的薄膜包装好进入成品原料区;不满足相关要求的的薄膜贴好标签,放入成品原料区独立保存。
优选的,所述在S4过程中,多层膜挤出机内部采用的碟状过滤器加热温度控制在270℃-310℃。
优选的,所述在S8工作中,分别检验其薄膜耐腐蚀性能、耐温情况、气体渗透性能、薄膜力学性能、拉伸性能、抗紫外线老化性能以及粘合性能和热封性能。
(三)有益效果
本发明提供了一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,具备以下有益效果:
该抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,采用平挤上吹设备,制备出高性能多层复合氟膜;多层复合氟膜,利用多层结构的优势,最外层氟树脂耐高低温、耐紫外老化、耐摩擦、耐腐蚀、阻隔水;粘结层链接氟树脂与阻气层,起到良好粘结性能;阻气层采用高性能未改性(或改性)的阻隔材料;三者有机统一制备的多层复合薄膜,采用薄膜吹塑工艺,使含氟树脂复合膜薄膜内高分子横向与纵向呈现有序排列;进一步提高了含氟树脂复合薄膜横向与纵向力学性能(拉伸强度、拉伸模量、断裂强度、断裂伸长率);进一步提高了含氟树脂复合膜气体阻隔性;进一步提高了含氟树脂复合薄膜横向与纵向的耐磨性;进一步提高了化学稳定性,也可作为临近空间飞艇的阻隔层。
具体实施方式
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
本发明提供一种技术方案:一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,包括以下步骤:
S1、计量:将尼龙、聚乙烯、酸改性聚烯烃合成物、乙烯四氟乙烯聚合物等原辅材料,(其原辅材料均为颗粒状)通过人工手动加入至挤出机的料斗中,并按照特定比例进行自动计量与混合配比。
S2、干燥:对有吸湿倾向的高聚物,在进行加工之前,须要先进行干燥处理,干燥温度在80~150℃左右,干燥时间约4~24小时,干燥后的聚合物切片湿含量要求控制在50ppm以下。
S3、加料、添料及挤出:当挤出机和机头达到保温要求后(即:温度在220~310℃),启动挤出机,向料斗加入少量的原辅材料,开始时螺杆以低速转动,当熔融料通过机头并吹胀成管泡后,逐渐提高螺杆转速,同时把料加满,并采用定制的多层挤出设备将氟树脂与其他树脂相结合,制备出来多层共挤薄膜,在融熔料挤出中,采用一定含量的含钛母料切片加入配用至融熔料中,通过母料切片分解后的二氧化钛微粒在薄膜中的分布,从而增加薄膜对紫外线的吸收能力,与此同时采用冷却水对挤出机电机进行不间断的循环冷却,确保挤出机电机处于安全温度以内。
S4、过滤与除杂:为了去除熔体中可能存在的杂质、凝胶粒子、鱼眼等异物,常在熔体管线上计量泵的前后各安装一只过滤器,薄膜生产线通常采用碟状过滤器,其材料为不锈钢网与不锈钢烧结毡组合而成,不锈钢碟片的尺寸为Φ12英寸,过滤网孔径一般设置在10-30μ。
S5、混合与控温:在熔体原材料流过熔体管时,沿着管壁的熔体温度与熔体中心的温度由于距离的限制,从而导致其之间具有较大的温差,为使进入模头的熔体温度均匀一致,以保证模头出料均匀,须在熔体管连接模头的一端内部安装若干组静态混合器,熔体流过静态混合器时,会自动产生分—合—分—合的均匀混合作用,从而达到熔体机头约为210℃-310℃左右。
S6、定型:将熔融后的树脂,经挤出机内部挤出吹塑的机械力作用而进行纵向拉伸,同时经压缩空气吹胀进行横向拉伸,使多层复合膜吹胀成薄膜,然后经多层膜挤出机自带的多个挤出机共挤,经由同一个机头挤出;通过挤出机自带的风机配合位于机头的冷却环,对处于冷却线内的多层膜进行冷却、机械自动牵引、拉伸、定型、收卷后制成多层薄膜。
S7、剖开展平收卷与后续检验:经过多层膜挤出机自带的多辊轴对定型后的薄膜进行收卷,将定型好的薄膜经过多层膜挤出机自带切边设备进行裁边,通过展平机对裁边好的薄膜进行展平收卷。
S8、检验:将多层复合膜收卷前、后各裁剪若干个约5m长的样品,进行检验。
S9、包装入库:将检验后满足相关要求的与不满足相关要求的多层复合薄膜贴样签,满足相关要求的薄膜包装好进入成品原料区;不满足相关要求的的薄膜贴好标签,放入成品原料区独立保存。
其中,在S4过程中,多层膜挤出机内部采用的碟状过滤器加热温度控制在270℃-310℃。
其中,在S8工作中,分别检验其薄膜耐腐蚀性能、耐温情况、气体渗透性能、薄膜力学性能、拉伸性能、抗紫外线老化性能以及粘合性能和热封性能。
实施例2
具体与实施例1的区别在于:在S3中,通过挤出机定型吹出双层或单层结构的薄膜。
对比例
取100份原材料,分别按照实施例1、2和现有技术进行制备,制备完成后测定每份原材料中的拉伸强度、耐腐蚀性、气体阻隔性能和热封强度,将实施例1的样品随机取样后置于一号容器,实施例2的样品随机取样后置于2号容器,现有技术的样品随机取样后置于3号容器,具体参照下表:
容器号 | 1 | 2 | 3 |
耐高低温性 | 极耐高低温 | 耐高低温 | 不耐高低温 |
耐紫外老化程度 | 极耐老化 | 耐老化 | 不耐老化 |
气体阻隔性 | 极强 | 较强 | 较差 |
热封强渡 | 极强 | 较强 | 较差 |
耐腐蚀性 | 极耐腐蚀 | 较耐腐蚀 | 不耐腐蚀 |
综上所述,采用多层复合工艺挤出来薄膜能够达到最佳性能。
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。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (3)
1.一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,其特征在于,包括以下步骤:
预制料:将氟树脂(改性氟树脂)与紫外线屏蔽剂(有机或无机类化合物)通过熔融共混的方式,均匀混合造粒。
S1、计量:将尼龙、聚乙烯、酸改性聚烯烃合成物、乙烯四氟乙烯聚合物等原辅材料,(其原辅材料均为颗粒状)通过人工手动加入至挤出机的料斗中,并按照特定比例进行自动计量与混合配比。
S2、干燥:对有吸湿倾向的高聚物,在进行加工之前,须要先进行干燥处理,干燥温度在80~150℃左右,干燥时间约4~24小时,干燥后的聚合物切片湿含量要求控制在50ppm以下。
S3、加料、添料及挤出:当挤出机和机头达到保温要求后(即:温度在220~310℃),启动挤出机,向料斗加入少量的原辅材料,开始时螺杆以低速转动,当熔融料通过机头并吹胀成管泡后,逐渐提高螺杆转速,同时把料加满,并采用定制的多层挤出设备将氟树脂(或改性氟树脂)与其他树脂相结合,制备出来多层共挤薄膜,与此同时采用冷却水对挤出机电机进行不间断的循环冷却,确保挤出机电机处于安全温度以内。
S4、过滤与除杂:为了去除熔体中可能存在的杂质、凝胶粒子、鱼眼等异物,常在熔体管线上计量泵的前后各安装一只过滤器,薄膜生产线通常采用碟状过滤器,其材料为不锈钢网与不锈钢烧结毡组合而成,不锈钢碟片的尺寸为Φ12英寸,过滤网孔径一般设置在10-30μ。
S5、混合与控温:在熔体原材料流过熔体管时,沿着管壁的熔体温度与熔体中心的温度由于距离的限制,从而导致其之间具有较大的温差,为使进入模头的熔体温度均匀一致,以保证模头出料均匀,须在熔体管连接模头的一端内部安装若干组静态混合器,熔体流过静态混合器时,会自动产生分—合—分—合的均匀混合作用,从而达到熔体机头约为210℃-310℃左右。
S6、定型:将熔融后的树脂,经挤出机内部挤出吹塑的机械力作用而进行纵向拉伸,同时经压缩空气吹胀进行横向拉伸,使多层复合膜吹胀成薄膜,然后经多层膜挤出机自带的多个挤出机共挤,经由同一个机头挤出;通过挤出机自带的风机配合位于机头的冷却环,对处于冷却线内的多层膜进行冷却、机械自动牵引、拉伸、定型、收卷后制成多层薄膜。
S7、剖开展平收卷与后续检验:经过多层膜挤出机自带的多辊轴对定型后的薄膜进行收卷,将定型好的薄膜经过多层膜挤出机自带切边设备进行裁边,通过展平机对裁边好的薄膜进行展平收卷。
S8、检验:将多层复合膜收卷前、后各裁剪若干个约5m长的样品,进行检验。
S9、包装入库:将检验后满足相关要求的与不满足相关要求的多层复合薄膜贴样签,满足相关要求的薄膜包装好进入成品原料区;不满足相关要求的的薄膜贴好标签,放入成品原料区独立保存。
2.根据权利要求1所述的一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,其特征在于:在S4过程中,多层膜挤出机内部采用的碟状过滤器加热温度控制在270℃-310℃。
3.根据权利要求1所述的一种抗紫外老化的氟树脂氦气阻隔薄膜多层共挤薄膜工艺,其特征在于:在S8工作中,分别检验其薄膜耐腐蚀性能、耐温情况、气体渗透性能、薄膜力学性能、拉伸性能、抗紫外线老化性能以及粘合性能和热封性能。
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