CN106494021A - 一种pet覆膜铝板及其制备方法 - Google Patents
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Abstract
本发明涉及一种PET覆膜铝板及其制备方法。目的是提供的覆膜铝板在高温下不黄变;所提供的制备方法具有工艺简单、调控方便的特点。技术方案是:一种PET覆膜铝板,由下而上依次包含铝板、醇溶性聚酯酰胺预涂层、PET膜;本发明中,铝板的厚度为0.1‑0.6mm;PET膜厚度为0.01~0.06mm;醇溶性聚酯酰胺预涂层分子量在3000~30000道尔顿范围内;上胶量控制在0.1‑15g/m2之间。本发明还提供了一种上述覆膜铝板的制备方法,包括如下步骤:(1)铝带表面处理;(2)在铝带表面预涂聚酯酰胺层;(3)除稀释剂;(4)在聚酯酰胺层上覆PET膜并热熔PET膜,使其在铝带表面粘牢。
Description
技术领域
本发明涉及一种PET覆膜铝板及其制备方法。
背景技术
长期以来,金属包装行业对于铝板抗蚀处理的主要方法是在铝板表面涂布有机高分子涂层---涂料。近年来,金属板覆膜技术逐步兴起,相较于涂布工艺,其制程更为环保、性能更可靠,成为当下备受青睐的新型金属板抗蚀处理技术(参见CN102848702、CN103935079、CN104130569等)。覆膜金属板具有抗油烟、耐磨损、防潮湿、触感好、花色多、价位适中、性价比好等诸多优势,在金属包装行业具有较大发展潜力。
由于聚合物膜与金属板直接复合往往存在粘结强度不够等问题,使用胶粘剂复合进行覆膜的方法多被采用,该法的优点是设备结构简单、标准化强、技术获得容易等。
用于覆膜铝板制造的高分子薄膜既需要具有热塑性贴合能力,又要与不同封装内容物的理化性能兼容,常用的能够满足要求的高分子薄膜有PP、PA、PE、PET等,其中PET膜综合性能最优,具有成型性、可杀菌性、硬度高、耐高温、耐磨、经特殊处理可印刷等特性。然而,国内现有的PET覆膜铝板在拉伸、弯折和冲压等复合力的作用下,膜的附着力较差,易脱落;且PET膜在高温热熔时,由于黏合剂不耐高温以及PET分解等因素易造成黄变,严重影响产品外观。
发明内容
针对上述背景技术的不足,本发明提供了一种PET覆膜铝板及其制备方法,该覆膜铝板在高温下不黄变,且在受到拉伸、弯折和冲压等复合力的作用下,膜不易脱落;所提供的制备方法具有工艺简单、调控方便的特点。
一种PET覆膜铝板,由下而上依次包含铝板、醇溶性聚酯酰胺预涂层、PET膜;
本发明中,铝板的厚度为0.1-0.6mm,优选0.3~0.5mm;PET膜厚度为0.01~0.06mm,优选0.01~0.02mm;醇溶性聚酯酰胺预涂层分子量在3000~30000道尔顿范围内,优选10000~15000;上胶量控制在0.1-15g/m2之间,优选0.5-1.5g/m2。
本发明还提供了一种上述覆膜铝板的制备方法,包括如下步骤:
(1)铝带表面处理
表面处理方法为等离子体处理、酸碱处理、电化学处理、物理打磨处理中的一种或数种;
(2)在铝带表面预涂聚酯酰胺层
将醇溶性聚酯酰胺热熔胶用溶剂稀释成低黏溶液,均匀涂覆于步骤(1)所得铝带表面并形成一聚酯酰胺层;
所述溶剂为乙醇或乙酸乙酯;低黏溶液浓度在1~30wt%范围内,优选2~10wt%;稀释的目的在于提高涂胶的操作便利性和效率,降低单位面积用胶量。
(3)除稀释剂
将涂胶后的铝带匀速通过温度为110~130℃的控温烘箱,使得聚酯酰胺层中的稀释剂迅速挥发;铝带运动速度为1-15m/min.;
(4)在聚酯酰胺层上覆PET膜并热熔PET膜,使其在铝带表面粘牢;
所述覆膜过程由覆膜机完成,之后将覆膜铝带传送至290~300℃的控温烘箱中使PET热熔,最后出烘箱后冷却。
步骤(2)中的均匀涂覆方法是:铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上;上胶量(除去稀释剂后)控制在0.1-15g/m2之间。
醇溶性聚酯酰胺热熔胶的制备方法是:取二聚酸100~200份(质量份,下同)、乙醇胺5~25份、己二酸1~15份、磷酸0.01~0.05份,150~170℃氮气氛围中反应2~4h,升温至170~220℃继续反应9~12h,随后添加稳定剂叔丁基邻苯二酚0~0.5份和马来酸酐0-10份,90~120℃下反应0.5~3h。
铝带的传送速率根据胶水的稀释程度、上胶量及后续干燥步骤进行调节。
所述上胶量优选0.5-1.5g/m2。
所述低黏溶液浓度为2~10wt%。
所述表面处理优选等离子体或电化学处理。
本发明的有益效果是:所提供的PET覆膜铝板,其中的聚酯酰胺预涂层在高温下剥离强度高、低温下不脆裂,热稳定性能好,柔韧性良好,可保证长时间在较热环境下(如夏季阳光曝晒下到达60℃)不会发生黄变,工作时热熔胶不软化,粘接性能保持力高,在受到拉伸、弯折和冲压等复合力的作用下,膜不易脱落;所提供的制备方法工艺流程简单,操作人员调控方便。
附图说明
图1为本发明所述覆膜铝板的结构示意图。
具体实施方式
下面结合具体实施例对本发明做进一步的说明,但本发明不限于下述实施例。
本发明的剥离强度按照GB/T2791-1995方法进行检测。
实施例1
普通铝板厚0.4mm,PET流延膜厚0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,聚酯酰胺热熔胶稀释浓度为3wt%。铝板经10wt%磷酸腐蚀10min后用纯水洗净,干燥;铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在1.0g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
实施例2
普通铝板厚0.4mm,PET流延膜厚0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,稀释浓度为3wt%;铝板经10wt%NaOH与10wt%磷酸分别腐蚀10min后用纯水洗净,干燥;铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在1.0g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
实施例3
电化学处理铝板厚0.4mm,PET流延膜厚度为0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,稀释浓度为3wt%。铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在1.0g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
实施例4
等离子体处理的铝板厚0.4mm,PET流延膜厚0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,稀释浓度为3wt%。铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在0.5g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
实施例5
等离子体处理的铝板厚0.4mm,PET流延膜厚0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,稀释浓度为3wt%。铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在1.0g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
实施例6
等离子体处理的铝板厚0.4mm,PET流延膜厚0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,稀释浓度为3wt%。铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在5g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
对比例1
普通铝板厚0.4mm,PET流延膜厚0.01mm。铝带经传动设备输送至装有纯乙醇的胶桶处,利用胶水辊将乙醇均匀分布到铝带上;涂润后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
对比例2
普通铝板厚0.4mm,PET流延膜厚0.01mm,聚酯酰胺热熔胶分子量为12000,稀释剂选用乙醇,稀释浓度为3wt%。铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上,上胶量控制在1.0g/m2;将涂胶后的履带匀速通过125℃的控温烘箱除去乙醇,并通过覆膜机覆膜;将覆膜铝带传送至300℃控温烘箱使PET热熔,出烘箱后冷却。
表1不同条件下所得覆膜铝板粘结强度比较
从表中可看出,未经表面处理的铝板与PET膜间的粘结性较差,聚酯酰胺预涂层能改善二者的粘接性;电化学和等离子体处理可显著改善PET膜与铝板的粘结强度;上胶量过多或过少均不利于粘结。
Claims (8)
1.一种PET覆膜铝板,由下而上依次包含铝板、醇溶性聚酯酰胺预涂层、PET膜;
其特征在于:所述铝板厚度为0.1-0.6mm,PET膜厚度为0.01~0.06mm,醇溶性聚酯酰胺预涂层分子量为3000~30000道尔顿,上胶量为0.1-15g/m2。
2.根据权利要求1所述的PET覆膜铝板,其特征在于:所述铝板厚度0.3~0.5mm;所述PET膜厚度为0.01~0.02mm;所述醇溶性聚酯酰胺预涂层分子量为10000~15000道尔顿;所述上胶量为0.5-1.5g/m2。
3.权利要求1所述的PET覆膜铝板的制备方法,包括如下步骤:
(1)铝带表面处理
表面处理方法为等离子体处理、酸碱处理、电化学处理、物理打磨处理中的一种或数种;
(2)在铝带表面预涂聚酯酰胺层
将醇溶性聚酯酰胺热熔胶用溶剂稀释成低黏溶液,均匀涂覆于步骤(1)所得铝带表面并形成一聚酯酰胺层;
所述溶剂为乙醇或乙酸乙酯;低黏溶液浓度在1~30wt%范围内;
(3)除稀释剂
将涂胶后的铝带匀速通过温度为110~130℃的控温烘箱,使得聚酯酰胺层中的稀释剂迅速挥发;铝带传送速度为1m-15m/min;
(4)在聚酯酰胺层上覆PET膜并热熔PET膜,使其在铝带表面粘牢;
覆膜过程由覆膜机完成,之后将覆膜铝带传送至290~300℃的控温烘箱中使PET热熔,最后出烘箱后冷却。
4.根据权利要求3所述的PET覆膜铝板的制备方法,其特征在于:所述醇溶性聚酯酰胺热熔胶的制备方法是:取二聚酸100~200质量份、乙醇胺5~25质量份、己二酸1~15质量份、磷酸0.01~0.05质量份,150~170℃氮气氛围中反应2~4h,升温至170~220℃继续反应9~12h,随后添加稳定剂叔丁基邻苯二酚0~0.5质量份和马来酸酐0-10质量份,90~120℃下反应0.5~3h。
5.根据权利要求4所述的PET覆膜铝板的制备方法,其特征在于:步骤(2)中的均匀涂覆方法是:铝带经传动设备输送至装有醇溶性聚酯酰胺热熔胶稀释液的胶桶处,利用胶水辊将胶水均匀分布到铝带上;上胶量控制在0.1-15g/m2之间。
6.根据权利要求5所述的PET覆膜铝板的制备方法,其特征在于:所述上胶量为0.5-1.5g/m2。
7.根据权利要求6所述的PET覆膜铝板的制备方法,其特征在于:所述步骤(2)中的低黏溶液浓度为2~10wt%。
8.根据权利要求7所述的PET覆膜铝板的制备方法,其特征在于:所述步骤(1)中的表面处理为等离子体处理或电化学处理。
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