CN116163157A - 一种高阻隔柔性包装材料 - Google Patents
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Abstract
本发明提供一种具有高阻隔柔性包装材料,包括一层纸张基底,一层底涂层,一层第一氧气阻隔层,一层第二氧气阻隔层和一层封合层。所述第一氧气阻隔层包括含有羟基的组合物。所述第二氧气阻隔层包括铝、纳米二氧化硅、纳米三氧化二铝、金刚石等一种金属或无机材料。所述封合层包含成膜性共聚物,可选择丁二烯与苯乙烯共聚物、丙烯酸酯化合物、乙烯丙烯酸共聚物、苯乙烯‑丙烯酸酯共聚物、乙烯‑醋酸乙烯酯共聚物等一种或多种。这种高阻隔柔性包装材料采用一层纸张基底、一层第一氧气阻隔层、一层第二氧气阻隔层和一层封合层的复合结构,能够解决水蒸气阻隔的问题,且所采用的材料无塑环保易回收,能够满足消费者对于食品保鲜和环保的要求。
Description
技术领域
本发明涉及一种柔性包装材料,尤其涉及一种高阻隔柔性包装材料。
背景技术
柔性包装由于其便携,成本低廉的特点受到了食品行业和消费者青睐。现有的柔性包装材料通常依据阻隔性能来区分,首先是含有金属铝层或者含有镀铝的PET或镀铝的BOPP材料,其阻隔性能最佳;其次为具有PET,PA或EVOH层的包装材料,但是单一的聚烯烃的阻隔性能较为普通,仅作为透明包装袋使用。而纸张作为一种可回收、可降解、成本低廉的材料,在柔性包装领域鲜少应用。主要原因是改善纸张内部的孔隙结构丰富,改善纸张天然亲水的特点,以达到普通聚烯烃材料的阻隔性能尤为困难。
另外,纸张内部含有大量的羟基,氧气阻隔材料也可能含有大量的羟基。目前需要一种无塑环保的食品包装材料,达到消费者对于食品保鲜、环保的要求,就需要在无聚烯烃材料层结构的包装材料中解决水蒸气阻隔的问题。
发明内容
针对现有技术的不足,本发明提供了一种高阻隔柔性包装材料,采用一层纸张基底、一层底涂层、一层第一氧气阻隔层、一层第二氧气阻隔层和一层封合封合层的复合结构,能够解决水蒸气阻隔的问题,且所采用的材料无塑环保、易回收,能够满足消费者对于食品保鲜和环保的要求。
为了实现上述目的,本发明提供如下技术方案:
一种高阻隔柔性包装材料,依次包括一层纸张基底,一层底涂层,一层第一氧气阻隔层,一层第二氧气阻隔层和一层封合层,所述纸张基底包括化学漂白阔叶木浆,化学漂白针叶木浆,化学热摩机械浆,碱性过氧化氢机械浆的一种或多种。所述纸张基底的MD方向上的拉伸率大于等于1%,或大于等于3%,或大于等于6%;所述第一氧气阻隔层包括铝、纳米二氧化硅、纳米三氧化二铝、金刚石等一种金属或无机材料;所述第二氧气阻隔层包括含有羟基的组合物,包括乙烯乙醇共聚物、聚乙烯醇、纳米纤维素、纳米直链淀粉、纳米几丁质的一种或多种;所述封合层包含成膜性共聚物,可选择丁二烯与苯乙烯共聚物、丙烯酸酯化合物、乙烯丙烯酸共聚物、苯乙烯-丙烯酸酯共聚物、乙烯-醋酸乙烯酯共聚物等一种或多种。
所述纸张基底采用0~90%化学漂白针叶木浆和0~100%化学漂白阔叶木浆。
所述纸张基底采用0~80%化学漂白针叶木浆、15~100%化学漂白阔叶木浆和0~30%的纳米纤维素MFC。
所述纸张基底的MD方向上的拉伸率大于等于1%,或大于等于3%,或大于等于6%。所述纸张基底的CD方向上的拉伸率大于等于1%,或大于等于5%,或大于等于9%,所述拉伸率的测试方法使用ISO1924测定。
所述底涂层的克重范围为5~20g/m2,或9~25g/m2,或1~8g/m2,或24~40g/m2。
所述底涂层含有粘结剂,可选择丁二烯与苯乙烯共聚物、丙烯酸酯化合物、乙烯丙烯酸共聚物、苯乙烯-丙烯酸酯共聚物、乙烯-醋酸乙烯酯共聚物、淀粉、糊精、壳聚糖、纤维素醚、淀粉醚、纳米纤维素、纳米微晶纤维素、纳米微纤化纤维素等一种或多种。所述底涂层中粘结剂的含量在7~15%,或为15~22%,或为22~55%,或为40~100%。
所述底涂层可以含有有颜料,所述颜料可为研磨碳酸钙、沉淀碳酸钙、高岭土、粘土、滑石粉等一种或多种。
所述颜料的D50粒径小于等于2微米,颜料可选择的D95粒径小于等于2微米,或D98粒径小于等于2微米。
所述底涂层中颜料的含量在0~60%,或为70~90%,或为55-70%。
所述颜料为片状材料,具体为沉淀碳酸钙,高岭土或粘土时,所述颜料的径厚比大于等于10,或大于等于50,或大于等于100。
所述底涂层包含0~84%的粘土,D50粒径为1.92微米。
所述底涂层还可以包括0~0.3%,或0.2~14%的纳米微晶纤维素。
进一步的,底涂层还可以包括5-20%,0-9%,17-34%的多元醇或含有二元醇,所述醇为山梨醇、丙三醇、乙二醇、聚乙二醇、聚乙烯醇的一种或多种。
所述第一氧气阻隔层包括铝、纳米二氧化硅、纳米三氧化二铝、金刚石等一种金属或无机材料。
第一氧气阻隔层的厚度为20~60纳米,或10~30纳米,或40~100纳米。
所述第二氧气阻隔层包括聚乙烯醇,所述聚乙烯醇的醇解度为87~92%,91~95%或94~99%,或96~100%,所述聚乙烯醇的分子量可为25~30万、或分子量17~22万、或分子量12~15万,或分子量2.5~13万。
所述第二氧气阻隔层还包括纳米纤维素,所述纳米纤维素可选择微纤维纤维素MFC,或纳米微纤维纤维素NFC,或纳米微晶纤维素NCC,所述纳米纤维素的长径比大于等于50,或大于等于100,或大于等于300,所述纳米纤维的直径范围为大于等于3.5纳米。
进一步的,底涂层还可以包括5-20%,0-9%,17-34%的多元醇或含有二元醇,所述醇为山梨醇、丙三醇、乙二醇、聚乙二醇、聚乙烯醇的一种或多种。
进一步的,第二氧气阻隔层包括5-20%,0-9%,17-34%的多元醇或含有二元醇,所述醇为山梨醇、丙三醇、乙二醇、聚乙二醇、聚乙烯醇的一种或多种。
封合层采用乙烯丙烯酸共聚物(EAA)。
本发明提供了一种制备所述的高阻隔柔性包装材料的制备方法,所述纸张具有如下性能:纸张的密度大于等于0.9Kg/m3;MD方向拉伸指数为65Nm/g至320Nm/g,测试标准为ISO 1924-3:2005;横向方向(CD)上的拉伸指数为40Nm/g至290Nm/g,测试标准为ISO1924-3:2005;在MD上的TEA指数为1.5J/g至5.9J/g,测试标准为ISO 1924-3:2005;在CD上的TEA指数为1.8J/g至5.9J/g,测试标准为ISO 1924-3:2005;
可选地,纸浆浆料的配比可以任意选择,如可以采用化学漂白浆浆料,也可以采用机械浆料,例如,采用原生纤维至少占比70%以上的浆料,或是化学漂白浆含量大于等于60%的浆料。
具体制备步骤如下:采用涂布机对纸张的一侧施加底涂层,在施加底涂层后,经过涂布的纸张经过涂布、烘干后,采用转移化学沉积法或真空蒸镀法施加第一氧气阻隔层;通过涂布机施加一层第二氧气阻隔层;再次干燥后,通过涂布机施加封合层后再干燥。纸张涂布和干燥过程中,纸张基底的含水量小于等于11%,大于等于2%。合适的含水量范围为3~8%,或5-7%。低于合适的含水范围,需要通过喷雾或喷水方式补充纸张内部的水分,以避免纸张基底因过度干燥产生开裂,影响到阻隔技术效果。
有益效果
与现有技术相比,本发明提供了一种高阻隔柔性包装材料,依次包括一层纸张基底,底涂层,一层第一氧气阻隔层,一层第二氧气阻隔层和一层封合层,所述纸张基底包括化学漂白阔叶木浆,化学漂白针叶木浆,化学热磨机械浆,碱性过氧化氢机械浆的一种或多种;所述第一氧气阻隔层包括铝、纳米二氧化硅、纳米三氧化二铝、金刚石等一种金属或无机材料。所述封合层包含成膜性共聚物,可选择丁二烯与苯乙烯共聚物、丙烯酸酯化合物、乙烯丙烯酸共聚物、苯乙烯-丙烯酸酯共聚物、乙烯-醋酸乙烯酯共聚物等一种或多种;所述第二氧气阻隔层包括含有羟基的组合物,包括乙烯乙醇共聚物、聚乙烯醇、纳米纤维素、纳米直链淀粉、纳米几丁质的一种或多种。本发明具备以下有益效果:这种高阻隔柔性包装材料采用一层纸张基底、一层第一氧气阻隔层、一层第二氧气阻隔层和一层封合层的复合结构,能够解决水蒸气阻隔的问题,且所采用的材料无塑环保易回收,能够满足消费者对于食品保鲜和环保的要求。
附图说明
通过阅读下文优选实施方式的详细描述,各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的,而并不认为是对本发明的限制。而且在整个附图中,用相同的参考符号表示相同的部件。在附图中:
图1示出了根据本发明实施例的可回收的包装材料结构示意图。
具体实施方式
实施例1
图1示出了根据本发明实施例的可回收的包装材料结构示意图,如图1所示,本实施例的可回收的包装材料可以包括纸张基底100、底涂层102、第一氧气阻隔层104、第二氧气阻隔层106和一层封合封合层108。
采用90%化学漂白针叶木浆和10%化学漂白阔叶木浆制成的纸张,采用涂布机对纸张的一侧施加底涂层,所述底涂层包含84%重量份的淀粉、14%质量份的聚乙二醇PEG200,2%的聚乙烯醇,其分子量为5万,醇解度为99%。淀粉为预糊化淀粉,具有醋酸酯官能团。
在施加底涂层后,经过涂布的纸张经过涂布、烘干后。表面粗糙度小于等于2.23微米,表面孔隙度为40纳米。
继续采用转移化学沉积法或真空蒸镀法施加第二氧气阻隔层,所述纸张经过蒸镀,含有40纳米的金属铝的涂层。纸张使用意大利Bobst K5真空镀铝机对纸张表面进行处理。在施加第一氧气阻隔层后,所述纸张的含水度低于3%,采用水汽喷雾装置对纸张非镀铝面进行适当补水后,纸张的含水度调整到3%-7%。
第二氧气阻隔层的成分是95%聚乙烯醇,其余5%是山梨醇。
封合层采用乙烯丙烯酸共聚物(EAA),采用美孚、陶氏、杜邦,SK化学等公司生产的产品。乙烯丙烯酸共聚物可以以乳液或溶液的方式分散溶解在水性涂料中,通过涂布方式施加在纸张基底上。
底涂层、第二氧气阻隔层和封合层可采用凹版涂布、柔版涂布、或帘式涂布,或狭缝涂布方式等一种或多种施加涂布层。涂布后,需要经过烘干。第二氧气阻隔层和封合层可同时或分开涂布。
帘式涂布可包含一个或多个涂布槽,典型的的多个涂布槽为2-3个。维美德Valmet、福伊特Voith、TSE Troller等公司都提供多个涂布槽的帘式涂布机构。
实施例1的各层成分和克重如下表1所示。
表1
实施例2:
采用80%化学漂白针叶木浆、15%化学漂白阔叶木浆,在纸机的湿部加入5%的纳米纤维素MFC。所述纳米纤维素采用化学漂白阔叶木浆为原料,采用唯美德商用双盘锥形磨浆机进行反复磨浆,其微小纤维含量大于等于98%。采用涂布机对纸张的一侧施加底涂层,所述底涂层包含69%的淀粉,23%的丙三醇,8%的聚乙二醇PEG200。
在施加底涂层后,经过涂布的纸张经过涂布、烘干后。表面粗糙度小于等于2.2微米,表面孔隙度为30纳米。
继续采用转移化学沉积法或真空蒸镀法施加第二氧气阻隔层,所述纸张经过蒸镀,含有40纳米的金属铝的涂层。纸张使用意大利Bobst K5真空镀铝机对纸张表面进行处理。在施加第一氧气阻隔层后,所述纸张的含水度低于3%,采用水汽喷雾装置对纸张非镀铝面进行适当补水后,纸张的含水度调整到3%-7%。
第二氧气阻隔层的成分是90%聚乙烯醇,其余10%是丙三醇。
封合层采用乙烯丙烯酸共聚物(EAA),采用美孚、陶氏、杜邦,SK化学等公司生产的产品。乙烯丙烯酸共聚物可以以乳液或溶液的方式分散溶解在水性涂料中,通过涂布方式施加在纸张基底上。
底涂层、第二氧气阻隔层和封合层可采用凹版涂布、柔版涂布、或帘式涂布,或狭缝涂布方式等一种或多种施加涂布层。涂布后,需要经过烘干。第二氧气阻隔层和封合层可同时或分开涂布。
帘式涂布可包含一个或多个涂布槽,典型的的多个涂布槽为2-3个。维美德Valmet、福伊特Voith、TSE Troller等公司都提供多个涂布槽的帘式涂布机构。
实施例2的各层成分和克重如下表2所示。
表2
实施例3:采用80%化学漂白针叶木浆、15%化学漂白阔叶木浆,在纸机的湿部加入5%的纳米纤维素MFC。所述纳米纤维素采用化学漂白阔叶木浆为原料,采用唯美德商用双盘锥形磨浆机进行反复磨浆,其微小纤维含量大于等于98%。采用涂布机对纸张的一侧施加底涂层,所述底涂层包含60%的淀粉,30%的丙三醇,10%的纳米微晶纤维素NCC。
在施加底涂层后,经过涂布的纸张经过涂布、烘干后。表面粗糙度小于等于1.9微米,表面孔隙度为10纳米。
继续采用转移化学沉积法或真空蒸镀法施加第二氧气阻隔层,所述纸张经过蒸镀,含有40纳米的金属铝的涂层。纸张使用意大利Bobst K5真空镀铝机对纸张表面进行处理。在施加第一氧气阻隔层后,所述纸张的含水度低于3%,采用水汽喷雾装置对纸张非镀铝面进行适当补水后,纸张的含水度调整到3%-7%。
第二氧气阻隔层的成分是98%聚乙烯醇,其余2%是丙三醇。
封合层采用乙烯丙烯酸共聚物(EAA),采用美孚、陶氏、杜邦,SK化学等公司生产的产品。乙烯丙烯酸共聚物可以以乳液或溶液的方式分散溶解在水性涂料中,通过涂布方式施加在纸张基底上。
底涂层、第二氧气阻隔层和封合层可采用凹版涂布、柔版涂布、或帘式涂布,或狭缝涂布方式等一种或多种施加涂布层。涂布后,需要经过烘干。第二氧气阻隔层和封合层可同时或分开涂布。
帘式涂布可包含一个或多个涂布槽,典型的的多个涂布槽为2-3个。维美德Valmet、福伊特Voith、TSE Troller等公司都提供多个涂布槽的帘式涂布机构。
实施例3的各层成分和克重如下表所示。
表3
上述三种实施方式的数据如下表4:
表4
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:在本发明的精神和原则之内,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脱离本发明的保护范围。
Claims (18)
1.一种高阻隔柔性包装材料,依次包括一层纸张基底,一层底涂层,一层第一氧气阻隔层,一层第二氧气阻隔层和一层封合层,所述纸张基底包括化学漂白阔叶木浆,化学漂白针叶木浆,化学热磨机械浆,碱性过氧化氢机械浆的一种或多种;所述第一氧气阻隔层包括铝、纳米二氧化硅、纳米三氧化二铝、金刚石等一种金属或无机材料;所述第二氧气阻隔层包括含有羟基的组合物,包括乙烯乙醇共聚物、聚乙烯醇、纳米纤维素、纳米直链淀粉、纳米几丁质的一种或多种;所述封合层包含成膜性共聚物,可选择丁二烯与苯乙烯共聚物、丙烯酸酯化合物、乙烯丙烯酸共聚物、苯乙烯-丙烯酸酯共聚物、乙烯-醋酸乙烯酯共聚物等一种或多种。
2.如权利要求1所述的高阻隔柔性包装材料,其中,所述纸张基底采用0~90%化学漂白针叶木浆和0~100%化学漂白阔叶木浆。
3.如权利要求1所述的高阻隔柔性包装材料,其中,所述纸张基底采用0~80%化学漂白针叶木浆、15~100%化学漂白阔叶木浆和0~30%的纳米纤维素MFC。
4.如权利要求1所述的高阻隔柔性包装材料,其中,所述纸张的密度大于0.9Kg/m3。所述纸张基底的MD方向上的拉伸率大于等于1%,或大于等于3%,或大于等于6%;所述纸张基底的CD方向上的拉伸率大于等于1%,或大于等于5%,或大于等于9%,所述拉伸率的测试方法使用ISO1924测定。
5.如权利要求1所述的高阻隔柔性包装材料,其中,所述底涂层的克重范围为5~20g/m2,或9~25g/m2,或1~8g/m2,或24~40g/m2。
6.如权利要求1所述的高阻隔柔性包装材料,其中,所述底涂层含有粘结剂,可选择丁二烯与苯乙烯共聚物、丙烯酸酯化合物、乙烯丙烯酸共聚物、苯乙烯-丙烯酸酯共聚物、乙烯-醋酸乙烯酯共聚物、淀粉、糊精、壳聚糖、纤维素醚、淀粉醚、纳米纤维素、纳米微晶纤维素、纳米微纤化纤维素等一种或多种。所述底涂层中粘结剂的含量在7~15%,或为15~22%,或为22~55%,或为40~100%。
7.如权利要求1所述的高阻隔柔性包装材料,其中,所述底涂层设置有颜料,所述颜料可为研磨碳酸钙、沉淀碳酸钙、高岭土、粘土、滑石粉等一种或多种。
8.如权利要求7所述的高阻隔柔性包装材料,其中,所述颜料的D50粒径小于等于2微米,颜料可选择的D95粒径小于等于2微米,或D98粒径小于等于2微米。
9.如权利要求7所述的高阻隔柔性包装材料,其中,所述底涂层中颜料的含量在0~60%,或为70~90%,或为55-70%。
10.如权利要求7所述的高阻隔柔性包装材料,其中,所述颜料为沉淀碳酸钙,高岭土或粘土时,所述颜料的径厚比大于等于10,或大于等于50,或大于等于100。
11.如权利要求2或3所述的高阻隔柔性包装材料,其中,所述底涂层或第二氧气阻隔层包括5-20%,0-9%,17-34%的多元醇或含有二元醇,所述醇为山梨醇、丙三醇、乙二醇、聚乙二醇、聚乙烯醇的一种或多种。
12.如权利要求11所述的高阻隔柔性包装材料,其中,所述底涂层还包括0-0.3%,或0.2-14%的纳米微晶纤维素。
13.如权利要求1所述的高阻隔柔性包装材料,其中,所述第二氧气阻隔层包括聚乙烯醇,所述聚乙烯醇的醇解度为87~92%,91~95%或94~99%,或96~100%,所述聚乙烯醇的分子量可为25~30万、或分子量17~22万、或分子量12~15万,或分子量2.5~13万。
14.如权利要求1所述的高阻隔柔性包装材料,其中,所述第二氧气阻隔层包括纳米纤维素,所述纳米纤维素可选择微纤维纤维素MFC,或纳米微纤维纤维素NFC,或纳米微晶纤维素NCC,所述纳米纤维素的长径比大于等于50,或大于等于100,或大于等于300,所述纳米纤维的直径范围为大于等于3.5纳米。
15.如权利要求1所述的高阻隔柔性包装材料,其中,所述第一氧气阻隔层的厚度为20~60纳米,或10~30纳米,或40~100纳米。
16.如权利要求1所述的高阻隔柔性包装材料,其中,封合层采用乙烯丙烯酸共聚物(EAA)。
17.一种制备如权利要求1-16所述的高阻隔柔性包装材料的制备方法,采用具有如下性能的纸张:纸张的密度大于等于0.9Kg/m3;MD方向拉伸指数为65Nm/g至320Nm/g,测试标准为ISO 1924-3:2005;横向方向(CD)上的拉伸指数为40Nm/g至290Nm/g,测试标准为ISO1924-3:2005;在MD上的TEA指数为1.5J/g至5.9J/g,测试标准为ISO 1924-3:2005;在CD上的TEA指数为1.8J/g至5.9J/g,测试标准为ISO 1924-3:2005。
18.一种如权利要求17所述的高阻隔柔性包装材料的制备方法,制备步骤如下:采用涂布机对纸张的一侧施加底涂层,在施加底涂层后,经过涂布的纸张经过涂布、烘干后,采用转移化学沉积法或真空蒸镀法施加第一氧气阻隔层;通过涂布机施加一层第二氧气阻隔层;再次干燥后,通过涂布机施加封合层后再干燥。
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