CN111806030B - 一种涂布型高阻隔双向拉伸聚酰胺薄膜及其制备方法 - Google Patents
一种涂布型高阻隔双向拉伸聚酰胺薄膜及其制备方法 Download PDFInfo
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Abstract
本发明涉及包装材料技术领域,尤其涉及一种涂布型高阻隔双向拉伸聚酰胺薄膜及其制备方法。其中,该薄膜包括涂布层和聚酰胺基材层;所述PVA涂布层为PVA涂布液涂覆在所述聚酰胺基材层表面形成,所述PVA涂布液包括PVA、硼酸和水;所述聚酰胺基材层由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述C层的组分包括共聚聚酰胺,树枝状聚酰胺胺,纳米活性金属粒子和抗氧剂。本发明提高的涂布型高阻隔双向拉伸聚酰胺薄膜生产工序简单,材料绿色环保;该薄膜拉伸强度、耐穿刺、耐油及耐化学性能等综合性能优异,在高温高湿条件下任具备极好阻隔效果,可广泛应用于食品、医疗、电子等软包装领域,具备较好的市场应用前景。
Description
技术领域
本发明涉及包装材料技术领域,尤其涉及一种涂布型高阻隔双向拉伸聚酰胺薄膜及其制备方法。
背景技术
目前,国内常用的高阻隔性包装薄膜材料主要有铝箔及镀铝薄膜,尼龙与EVOH共挤膜,聚偏二氯乙烯(PVDC)涂布膜等。铝箔及镀铝薄膜的优点是阻隔性最佳,可有效的阻隔紫外线,但缺点是不透明,耐折性差。
如公开号为CN103350545A,公开日为2013年10月16日,名称为《一种双向拉伸尼龙复合膜及其制备方法》的专利文件公开了一种双向拉伸复合膜,具有以下结构:第一尼龙层、第二尼龙层、EVOH层、第三尼龙层和第四尼龙层,各层均经过双向拉伸;其中,第一尼龙层和第四尼龙层由尼龙95%-100%和添加剂0-5%组成,第二尼龙层和第三尼龙层为100%的尼龙;EVOH层为100%的EVOH,尼龙与EVOH共挤膜的优点是具备优异的阻隔性能、耐油及有机溶剂性能,但缺点是随着湿度的增加,阻隔性明显降低。
PVDC涂布薄的优点是具备良好的阻氧和水蒸气的性能,涂布层可热封,成本低,但是PVDC在生产及其使用过程中会释放出有害气体,不环保。
聚乙烯醇成膜性好,干燥环境下具备极好的透明度,耐油性和气体阻隔性能,但缺点是熔融温度高于分解温度,只能通过涂布方式成膜,同时还存在耐湿性差,遇水脱层的问题,很难应用在水煮和蒸煮领域,限制其应用范围。
双向拉伸聚酰胺薄膜(BOPA)具备优异的阻隔性、耐穿刺性、耐油性、耐化学溶剂性以及无毒性等优点,被广泛应用于薄膜包装领域。但是双向拉伸聚酰胺薄膜的在50%湿度环境下氧气透过率约为33cc/(m2˙day),与其他高阻隔性包装薄膜相比,阻隔性差。
综合上述,目前仍需开发一种透明的、耐水煮及蒸煮的高阻隔双向拉伸聚酰胺薄膜,扩展其应用范围。
发明内容
为解决上述背景技术中提到的聚酰胺薄膜在湿度高于50%的条件下阻隔性能严重降低的问题,本发明提供一种涂布型高阻隔双向拉伸聚酰胺薄膜,其中,包括涂布层和聚酰胺基材层;所述PVA涂布层为PVA涂布液涂覆在所述聚酰胺基材层表面形成,所述PVA涂布液包括PVA、硼酸和水;所述聚酰胺基材层由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;
其中,所述C层的组分包括共聚聚酰胺,树枝状聚酰胺胺,纳米活性金属粒子和抗氧剂。
进一步地,所述PVA采用醇解度为99%的PVA1799;所述PVA涂布液的硼酸含量为0.1-1wt%;所述PVA涂布液的固含量为8-10wt%。
进一步地,所述A层组分按质量百分比包括:聚酰胺98%-100%,开口剂0-1%,爽滑剂0-1%;
所述B层组分为100%的聚酰胺;
所述C层组分按质量百分比包括:共聚聚酰胺62%-91.8%,树枝状聚酰胺胺5%-20%,纳米活性金属粒子3%-15%,抗氧剂0.2%-1%,开口剂0-1%,爽滑剂0-1%。
进一步地,所述PVA涂布液的制备方法为:
步骤a、将PVA溶于水中,70-90℃加热搅拌直至PVA完全溶解,随后降温至40-60℃,得到浓度为8-10wt%的PVA溶液,备用;
步骤b、在步骤a中得到的溶液添加0.1-1wt%硼酸,搅拌超声,直至分散均匀,制备得到PVA涂布液。
进一步地,所述聚酰胺为尼龙6、尼龙66、尼龙612、尼龙610、尼龙12、尼龙1212中的一种或几种组合;优选尼龙6,较佳地,尼龙6的粘度控制在2.6-2.8Pa˙s。
进一步地,所述开口剂为二氧化硅、滑石粉、亚克力、交联聚苯乙烯颗粒中的一种或几种组合。
进一步地,所述爽滑剂为酰胺类、聚乙烯蜡类、有机硅油中的一种或几种组合。
进一步地,所述共聚聚酰胺为尼龙6、尼龙66、尼龙11、尼龙12、尼龙1010、尼龙1212中的两种或两种以上的单体共聚而成的;所述共聚聚酰胺的熔点在120-160℃。
进一步地,所述树枝状聚酰胺胺为PAMAM1.0代、PAMAM 2.0代、PAMAM 3.0代、PAMAM4.0代、PAMAM 5.0代、PAMAM 6.0代、PAMAM7.0代、PAMAM 8.0代、PAMAM 9.0代、PAMAM 10.0代中的一种或几种组合。
进一步地,所述纳米活性金属粒子为活性纳米氧化镁、活性纳米氧化铝、活性纳米氧化钙、活性纳米氧化锌中的一种或几种组合。
进一步地,所述抗氧剂为抗氧剂1010。
进一步地,所述聚酰胺基材层的总厚度为10-30μm,所述A层和C层厚度均为1-3μm。
进一步地,所述涂布层厚度为0.5-2μm。
本发明还提供了如上任意所述的涂布型高阻隔双向拉伸聚酰胺薄膜的制备方法,包括以下步骤:
步骤一、将A层中的组分按比例掺混,经双螺杆挤出机熔融共混、挤出、造粒,将得到的母粒烘干,备用;
步骤二、将C层中除树枝形聚酰胺胺外的组分按比例掺混,经双螺杆挤出机熔融共混、挤出、造粒,将得到的母粒烘干,备用;
步骤三、将步骤一中得到的母粒分别投入A挤出机,制作A层;将聚酰胺投入B挤出机,制作B层;将步骤二得到的母粒与树枝形聚酰胺胺按比例投入C挤出机,制作C层;其中A层和B层的挤出机温度及其T型模头的温度控制在220-240℃之间,C层的挤出机温度及其T型模头的温度控制在140-180℃之间;
步骤四、采用LISIM同步拉伸法,将步骤三中各层挤出、急冷铸片,经60-80℃热水槽调湿、清洁表面,用热风清除铸片表面水分后,在C层的表面涂布制备好的PVA涂布液,然后进行双向拉伸,拉伸温度为50-100℃,定型温度为120-180℃,拉伸倍率为3.0*3.0-3.8*3.8,即可得到涂布型高阻隔双向拉伸聚酰胺薄膜。
本发明提供的一种涂布型高阻隔双向拉伸聚酰胺薄膜,与现有的技术相比,具有以下的效果:
1、硼酸作为交联剂可以与PVA中的羟基和酯基反应,使PVA分子交联,提高PVA涂层的耐水性能和阻隔性能。
2、采用共聚聚酰胺作为聚酰胺基材C层的原料,可降低加工温度,有效保留树枝状聚酰胺胺PAMAM活性基团;树枝状聚酰胺胺PAMAM的活性氨基官能团,也能与PVA中的羟基和酯基反应,可提高PVA涂层的耐水性能和阻隔性能;同时,PAMAM可以提高聚酰胺基材C层的表面张力,改善水性涂布液的均匀性和粘结效果。
3、活性纳米金属粒子吸水性能极强,在采用LISIM同步拉伸法,铸片,经60-80热水槽调湿过程中,活性纳米金属粒子迅速吸水,释放金属粒子,这些金属粒子可以与PVA中的羟基发生络合反应,可提高PVA涂层的耐水性能和阻隔性能。水煮过程中,该络合反应尤为突出。
4、A层和C层中除树枝形聚酰胺胺外的组分需先制作成母粒,而不能直接投入挤出机熔融挤出,是为了保证开口剂的分散性,防止其团聚形成晶黑点;将步骤二得到的母粒与树枝形聚酰胺胺按比例投入C挤出机,制作C层,是因为PAMAM容易分散,更重要的是为了保证其活性基团的有效性。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。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。
本发明提供一种涂布型高阻隔双向拉伸聚酰胺薄膜,其中,包括涂布层和聚酰胺基材层;所述PVA涂布层为PVA涂布液涂覆在所述聚酰胺基材层表面形成,所述PVA涂布液包括PVA、硼酸和水;所述聚酰胺基材层由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,A、B、C层作为共挤双向拉伸聚酰胺薄膜不同膜层的区别性称呼,表示共挤双向拉伸聚酰胺薄膜从内到外具有三层。
其中,所述C层的组分包括共聚聚酰胺,树枝状聚酰胺胺,纳米活性金属粒子和抗氧剂。
需要说明的是,实施例中未注明具体技术或条件者,按照本领域内的文献所描述的技术或条件或者按照产品说明书进行,所用试剂或仪器未注明生产厂商者,均为可以通过市购获得的常规产品。
本发明提供如下所示实施例:
实施例1
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99%,二氧化硅0.5%,芥酸酰胺0.5%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1010的三元共聚尼龙73.5%,PAMAM 4.0代15%,活性纳米氧化镁10%,抗氧剂1010 0.5%,二氧化硅0.5%,芥酸酰胺0.5%。
实施例2
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.1wt%硼酸含量和水制成,其固含量为8wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99.8%,二氧化硅0.1%,芥酸酰胺0.1%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1010的三元共聚尼龙91.6%,PAMAM 4.0代5%,活性纳米氧化镁3%,抗氧剂1010 0.2%,二氧化硅0.1%,芥酸酰胺0.1%。
实施例3
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,1wt%硼酸含量和水制成,其固含量为10wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 98%,二氧化硅1%,芥酸酰胺1%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1010的三元共聚尼龙62%,PAMAM 4.0代20%,活性纳米氧化镁15%,抗氧剂1010 1%,二氧化硅1%,芥酸酰胺1%。
实施例4
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99%,亚克力0.5%,乙撑双硬脂酸酰胺0.5%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1212的三元共聚尼龙73.5%,PAMAM 3.0代15%,活性纳米氧化锌10%,抗氧剂1010 0.5%,亚克力0.5%,乙撑双硬脂酸酰胺0.5%。
本发明还提供上述实施例的制备方法:
1、PVA涂布液的制备方法为:
步骤a、将PVA溶于水中,90℃加热搅拌直至PVA完全溶解,随后降温至60℃,得到浓度为8-10wt%的PVA溶液,备用;
步骤b、在步骤a中得到的溶液添加硼酸,搅拌超声,直至分散均匀,制备得到PVA涂布液。
2、涂布型高阻隔双向拉伸聚酰胺薄膜的制备方法,包括以下步骤:
步骤一、将A层组分中的聚酰胺、开口剂、爽滑剂按比例掺混,经双螺杆挤出机熔融共混、挤出、造粒,将得到的母粒烘干,备用;
步骤二、将C层组分中的共聚聚酰胺、纳米活性金属粒子,抗氧剂,开口剂,爽滑剂按比例掺混,经双螺杆挤出机熔融共混、挤出、造粒,将得到的母粒烘干,备用;
步骤三、将步骤一中得到的母粒分别投入A挤出机,制作A层;将聚酰胺投入B挤出机,制作B层;将步骤二得到的母粒与树枝形聚酰胺胺按比例投入C挤出机,制作C层;其中A层和B层的挤出机温度及其T型模头的温度控制在230℃之间,C层的挤出机温度及其T型模头的温度控制在160℃之间;
步骤四、采用LISIM同步拉伸法,将步骤三中各层挤出、急冷铸片,经70℃热水槽调湿、清洁表面,用热风清除铸片表面水分后,在C层的表面涂布制备好的PVA涂布液,然后进行双向拉伸,拉伸温度为70℃,定型温度为150℃,拉伸倍率为3.0*3.0,即可得到涂布型高阻隔双向拉伸聚酰胺薄膜。
本发明提供如下所示对比例:
对比例1
市场通用的双向拉伸尼龙薄膜,厚度为15μm。
对比例2
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799和水制成,其固含量为9wt%;
所述的聚酰胺基材层为市场通用的双向拉伸尼龙薄膜,厚度为15μm。
其PVA涂布液的制备方法和涂布方法与实施例相同。
对比例3
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层为市场通用的双向拉伸尼龙薄膜,厚度为15μm。
其PVA涂布液的制备方法和涂布方法与实施例相同。
对比例4
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99%,二氧化硅0.5%,芥酸酰胺0.5%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6 73.5%,PAMAM 4.0代15%,活性纳米氧化镁10%,抗氧剂1010 0.5%,二氧化硅0.5%,芥酸酰胺0.5%。
其PVA涂布液的制备方法、聚酰胺基材层的制备方法和涂布方法与实施例相同。
对比例5
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99%,二氧化硅0.5%,芥酸酰胺0.5%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1010的三元共聚尼龙88.5%,活性纳米氧化镁10%,抗氧剂1010 0.5%,二氧化硅0.5%,芥酸酰胺0.5%;
其PVA涂布液的制备方法、聚酰胺基材层的制备方法和涂布方法与实施例相同。
对比例6
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99%,二氧化硅0.5%,芥酸酰胺0.5%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1010的三元共聚尼龙83.5%,PAMAM 4.0代15%,抗氧剂1010 0.5%,二氧化硅0.5%,芥酸酰胺0.5%;
其PVA涂布液的制备方法、聚酰胺基材层的制备方法和涂布方法与实施例相同。
对比例7
一种涂布型高阻隔双向拉伸聚酰胺薄膜,包括两层结构,其结构由内至外依次是涂布层和聚酰胺基材层;
PVA涂布液由醇解度为99%的PVA1799,0.5wt%硼酸含量和水制成,其固含量为9wt%;
所述的聚酰胺基材层是由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;其中,所述A层组分按质量百分比包括:尼龙6 99%,二氧化硅0.5%,芥酸酰胺0.5%;所述B层组分为100%的尼龙6;所述C层组分按质量百分比包括:尼龙6/66/1010的三元共聚尼龙38.5%,PAMAM 4.0代35%,活性纳米氧化镁25%,抗氧剂1010 0.5%,二氧化硅0.5%,芥酸酰胺0.5%;
其PVA涂布液的制备方法、聚酰胺基材层的制备方法和涂布方法与实施例相同。
将实施例和对比例所制得的薄膜进行性能测试,测试评价结果如表1所示:
表1
水煮条件:100℃,30min,样品水煮后将表面水分擦干。
氧气透过率测试条件:23℃,80%RH。
从表1可以看出,本发明的双向拉伸聚酰胺涂布型阻隔薄膜,具有优异的阻隔性能,湿度对薄膜的阻隔性能影响小,能够应用于水煮等包装领域。
结合对比例2和对比例3的测试数据可以看出,采用添加有硼酸的PVA布液,其制得的薄膜的阻隔性较好;
从对比例3的测试数据可以看出,本发明提供的聚酰胺基材层比同等厚度的市场通用的双向拉伸尼龙薄膜,具有更好的阻隔性和耐水煮特性;
从对比例4-7的测试数据可以看出,共聚酰胺、树枝状聚酰胺胺、活性纳米金属粒子以及这些组分的含量配比,对薄膜的阻隔性、耐水煮特性和力学性能有较为明显的影响,可见共聚酰胺、树枝状聚酰胺胺、活性纳米金属粒子的组合可在保证薄膜的力学性能的前提下,进一步提高薄膜的阻隔性和耐水煮特性。
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (9)
1.一种涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于,包括涂布层和聚酰胺基材层;所述PVA涂布层为PVA涂布液涂覆在所述聚酰胺基材层表面形成,所述PVA涂布液的组分包括PVA、硼酸和水;所述聚酰胺基材层由三层共挤双向拉伸聚酰胺薄膜组成,从内到外依次为A、B、C层;
其中,所述C层的组分包括共聚聚酰胺,树枝状聚酰胺胺,纳米活性金属粒子和抗氧剂;
所述A层组分按质量百分比包括:聚酰胺98%-100%,开口剂0-1%,爽滑剂0-1%;
所述B层组分为100%的聚酰胺;
所述C层组分按质量百分比包括:共聚聚酰胺 62%-91.8%,树枝状聚酰胺胺5%-20%,纳米活性金属粒子3%-15%,抗氧剂0.2%-1%,开口剂0-1%,爽滑剂0-1%。
2.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述PVA涂布液的制备方法为:
步骤a、将PVA溶于水中,70-90℃加热搅拌直至PVA完全溶解,随后降温至40-60℃,得到浓度为8-10wt%的PVA溶液,备用;
步骤b、在步骤a中得到的溶液添加0.1-1wt%硼酸,搅拌超声,直至分散均匀,制备得到PVA涂布液。
3.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述聚酰胺为尼龙6、尼龙66、尼龙612、尼龙610、尼龙12、尼龙1212中的一种或几种组合。
4.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述共聚聚酰胺为尼龙6、尼龙66、尼龙11、尼龙12、尼龙1010、尼龙1212中的两种或两种以上的单体共聚而成的;所述共聚聚酰胺的熔点在120 -160 ℃。
5.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述树枝状聚酰胺胺为PAMAM1.0代、PAMAM 2.0代、PAMAM 3.0代、PAMAM 4.0代、PAMAM 5.0代、PAMAM6.0代、PAMAM7.0代、PAMAM 8.0代、PAMAM 9.0代、PAMAM 10.0代中的一种或几种组合。
6.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述纳米活性金属粒子为活性纳米氧化镁、活性纳米氧化铝、活性纳米氧化钙、活性纳米氧化锌中的一种或几种组合。
7.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述抗氧剂为抗氧剂1010。
8.根据权利要求1所述的涂布型高阻隔双向拉伸聚酰胺薄膜,其特征在于:所述聚酰胺基材层的总厚度为10-30μm,所述涂布层厚度为0.5-2μm。
9.一种根据权利要求1-8任一项所述的涂布型高阻隔双向拉伸聚酰胺薄膜的制备方法,其特征在于,包括以下制备步骤:
步骤一、将A层中的组分按比例掺混,经双螺杆挤出机熔融共混、挤出、造粒,将得到的母粒烘干,备用;
步骤二、将C层中除树枝形聚酰胺胺外的组分按比例掺混,经双螺杆挤出机熔融共混、挤出、造粒,将得到的母粒烘干,备用;
步骤三、将步骤一中得到的母粒分别投入A挤出机,制作A层;将聚酰胺投入B挤出机,制作B层;将步骤二得到的母粒与树枝形聚酰胺胺按比例投入C挤出机,制作C层;其中A层和B层的挤出机温度及其T型模头的温度控制在220-240℃之间,C层的挤出机温度及其T型模头的温度控制在140-180℃之间;
步骤四、采用LISIM同步拉伸法,将步骤三中各层挤出、急冷铸片,经60-80℃热水槽调湿、清洁表面,用热风清除铸片表面水分后,在C层的表面涂布制备好的PVA涂布液,然后进行双向拉伸,拉伸温度为50-100℃,定型温度为120-180℃,拉伸倍率为3.0*3.0-3.8*3.8,即可得到涂布型高阻隔双向拉伸聚酰胺薄膜。
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