CN115008853B - 一种易回收高阻隔纸铝复合包装材料及其制备方法 - Google Patents
一种易回收高阻隔纸铝复合包装材料及其制备方法 Download PDFInfo
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Abstract
本发明涉及新型包装材料领域,具体提供了一种易回收高阻隔纸铝复合包装材料及其制备方法,该包装材料为多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;采用这种组成的包装材料,具有水溶性好且易降解的优点,大大降低铝箔材料的回收难度;并且由于铝箔及涂布层的存在可赋予该材料优异的气体阻隔性。
Description
技术领域
本发明涉及新型包装材料领域,具体涉及一种易回收高阻隔纸铝复合包装材料及其制备方法。
背景技术
白色污染是最严重的生态问题之一,特别是在包装领域,石油基塑料薄膜具有极强的抗生物降解性,污染土壤、河流和海洋达数百年之久。随着环境保护意识的增强,“限塑”和可生物降解材料成为研究热点。塑料污染大多来源于各种包装材料,作为新一代纸基包装材料,需要具备优异的阻隔、印刷、力学、热封、防水防油、可生物降解等性能以满足其正常使用及环保要求。分析目前高阻隔型塑料包装材料的结构,主要包括中间的铝箔阻隔层,起到阻氧、阻水蒸气、阻气味的作用;内外塑料层(聚乙烯PE,聚对苯二甲酸乙二酯PET等),起到防水防油;纸板起到支撑及印刷承印功能;及油墨起彩色印刷显示的作用。其中塑料层及铝箔层均是不可降解材料,且难以实现回收利用。因此,如何从源头上利用生物质基可降解材料替代以上环境不友好的材料或物质是目前需要克服的难题。
目前,国内外科学家对易回收高阻隔性能的包装材料进行了广泛的研究。其策略主要包括:多层复合、表面改性或镀层及填加填料等技术。如将不同材料的膜进行复合,常用的有三层、五层或七层复合膜,如将铝箔等材料进行复合。表面改性主要是通过化学反应对材料的表面进行基团修饰,从而改变其极性。例如通过等离子体聚合等方法,增强聚烯烃表面的极性,从而提高其气体阻隔性。也可通过物理或化学的方法,将无机金属或氧化物等蒸镀在PET等塑料薄膜表面,形成几十到上百纳米的阻隔层。或通过填加无机片层材料,由于它具有很高的纵横比,高的结晶度,添加少量的片层无机材料在聚合物中,就可使气体分子的扩散路径变得曲折,从而降低材料的气体透过率,提高阻隔性。但是上述各种解决方案均存在制备工艺复杂,阻隔性能并不能达到食品级的阻隔要求,并且其核心阻隔层(铝箔)无法实现回收,容易造成资源浪费。
因此能否提供一种易回收高阻隔性能的包装材料,成为本领域亟待解决的问题之一。
发明内容
本发明针对现有技术存在的诸多问题,提供了一种易回收高阻隔纸铝复合包装材料及其制备方法,该包装材料为多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;采用这种组成的包装材料,具有水溶性好且易降解的优点,大大降低铝箔材料的回收难度;并且由于铝箔及涂布层的存在可赋予该材料优异的气体阻隔性。
本发明的最大特点就是在实现包装纸高强度、抗水性、可降解性等各项性能的前提下,不使用合成的化工产品,而是用纯生物质的纳米纤维素纤丝和疏水纳米纤维素来实现上述功能;
本申请的具体技术方案如下:
一种易回收高阻隔纸铝复合包装材料,具体为多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;
其中纸基层克重在25g/m2-45g/m2范围内的薄页纸,铝箔层厚度在5μm-10μm范围内的超薄铝箔;
所采用的粘结剂为亲水性好及可降解的淀粉、聚乙烯醇、海藻酸钠、壳聚糖、普鲁兰多糖、果胶、天然胶乳、环糊精、纳米纤维素、微晶纤维素及羧甲基纤维素等其中的一种或多种复合粘结剂,具体选用其水溶液,其浓度为7wt%-20wt%,粘度为1500Pa·s-3500Pa·s;优选的控制干燥后包装材料中的粘结剂含量为2g/m215g/m2。
所采用的涂布层选用聚己二酸/对苯二甲酸丁二醇酯(PBAT)、聚乳酸(PLA)、聚丁二酸丁二醇酯(PBS)、聚己内酯(PCL)、聚酰胺(PA)及EVOH(乙烯-乙烯醇共聚物)等一种或多种树脂复合配制而成的可降解材料乳液,其浓度为7wt%-20wt%,粘度为1500Pa·s-4000Pa·s;涂布层的涂布量均为干燥后5g/m2-20g/m2。
采用上述粘结剂和涂布乳液,其材料均为可降解材料,在使用之后可以通过降解去除从而将铝箔回收,同时上述采用的涂布材料均可以与食品直接接触,提高了安全性。
本申请所获得的易回收高阻隔纸铝复合包装材料,经检测,其Cobb值(1800s)可达0.1g/m2,Kit值为12,OTR可达0.01-0.05cm3/m2·d·0.1MPa以下,WVTR可达0.01-0.1g/m2·24h以下。
上述一种易回收高阻隔纸铝复合包装材料的制备方法,包括如下具体步骤:
(1)纸基层与铝箔层之间添加粘结剂,之后采用辊式涂布机进行辊压复合,其中辊式涂布机的涂布速度为100m/min-1000m/min,两辊之间的压力为20MPa-120Mpa;辊压次数不低于5次,之后通过烘干工艺,使其水分挥发达到干燥状态;
烘干工艺选用红外烘干,温度为80℃-140℃,烘干时间为60s-150s;确保烘干后的粘结剂含量为2g/m2-15g/m2;
(2)按照比例调配涂布层所用乳液,采用帘式涂布机或刮刀涂布机进行乳液涂布,其中先涂布铝箔层一侧,再涂布纸基层一侧;涂布完成后采用红外烘干,温度为80℃-150℃,烘干时间为80s-200s,控制涂布层的涂布量均为干燥后5g/m2-20g/m2;
通过上述工艺即可获得目标易回收高阻隔纸铝复合包装材料。
除此之外,本发明还提供了上述易回收高阻隔纸铝复合包装材料的回收方法,具体可采用水浸泡超声或生物降解,使铝箔层两侧的粘结层及涂布层水解、溶解或分解,从而实现铝箔材料的回收;其中优选采用水浸泡超声工艺,工艺参数为:
浸泡水量为将材料全部没过即可,超声工艺的能量为60W/m2-300W/m2。浸泡和超声同时进行时间为10h-24h;之后即可将最外层的涂布层去除或者剥离下来,剥离工艺不做限定;
生物降解为堆肥降解或土埋降解,均为常规的技术,发明人不再赘述,目的均为有效的将铝箔层回收。
与现有技术相比,本发明的有益效果如下:
(1)基于铝箔与涂布材料的协同性作用,使其具有优异的气体阻隔性能;
(2)由于纸基层与铝箔层之间采用的是生物质基材料粘合剂同时所采用的涂布材料也为可降解材料,上述材料可对铝箔形成有效的保护,使其可与食品等直接接触,提高其防水效果,使其具有铝箔易回收的优势。
附图说明
图1为本申请所述包装材料的结构示意图。
具体实施方式
下面结合实施例来进一步说明本发明,可以使本领域技术人员更全面的理解本发明,但不以任何方式限制本发明。下述实施例中所采用各种原料均为市场上直接购得,发明人不再赘述。
实施例1
一种易回收高阻隔纸铝复合包装材料,具体为多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;
其中纸基层克重在30g/m2范围内的薄页纸,铝箔层厚度在7μm的超薄铝箔;
所采用的粘结剂由如下材料组成:按重量份计:淀粉(5份),聚乙烯醇(3份)及环糊精(2份),水(90份),固含量为10wt%,测量其粘度为2599Pa·s;
所采用的涂布层选用聚己二酸/对苯二甲酸丁二醇酯乳液,其浓度为7wt%,粘度为1850Pa·s;
其具体制备方法如下:
(1)纸基层与铝箔层之间添加粘结剂,之后采用辊式涂布机进行辊压复合,其中辊式涂布机的涂布速度为500m/min,两辊之间的压力为80Mpa;辊压次数不低于5次,之后通过烘干工艺,使其水分挥发达到干燥状态;
烘干工艺选用红外烘干,温度为100℃,烘干时间为90s;确保烘干后的粘结剂含量为5g/m2;
(2)按照比例调配涂布层所用乳液,采用帘式涂布机进行乳液涂布,其中先涂布铝箔层一侧,再涂布纸基层一侧;涂布完成后采用红外烘干,温度为95℃,烘干时间为90s;控制涂布层的涂布量均为干燥后10g/m2;
通过上述干燥即可获得目标易回收高阻隔纸铝复合包装材料;
最终获得的包装材料,经检测,其Cobb值(1800s)可达0.1g/m2,Kit值为12,OTR可达0.021cm3/m2·d·0.1MPa,WVTR为0.0158g/m2·24h。
上述包装材料可采用水浸泡超声的方式回收,具体步骤如下:
浸泡水量为将材料全部没过即可,超声工艺的能量为100W/m2。浸泡和超声同时进行时间为24h;之后即可将最外层的涂布层去除或者剥离下来获得回收的铝箔层。
实施例2
一种易回收高阻隔纸铝复合包装材料,具体为多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;
其中纸基层克重在40g/m2范围内的薄页纸,铝箔层厚度在7μm的超薄铝箔;
所采用的粘结剂由如下材料组成:按重量份计:淀粉(6份),普鲁兰多糖(4份)及微晶纤维素(2份),水(88份),固含量为12wt%,测量其粘度为3210Pa·s;
所采用的涂布层选用聚己内酯和乙烯-乙烯醇共聚物等重量比的混合乳液,其浓度为10wt%,粘度为2050Pa·s;
其具体制备方法如下:
(1)纸基层与铝箔层之间添加粘结剂,之后采用辊式涂布机进行辊压复合,其中辊式涂布机的涂布速度为800m/min,两辊之间的压力为100Mpa;辊压次数不低于5次,之后通过烘干工艺,使其水分挥发达到干燥状态;
烘干工艺选用红外烘干,温度为85℃,烘干时间为120s;确保烘干后的粘结剂含量为8g/m2;
(2)按照比例调配涂布层所用乳液,采用帘式涂布机进行乳液涂布,其中先涂布铝箔层一侧,再涂布纸基层一侧;涂布完成后采用红外烘干,温度为95℃,烘干时间为120s;控制涂布层的涂布量均为干燥后15g/m2;
通过上述干燥即可获得目标易回收高阻隔纸铝复合包装材料;
最终获得的包装材料,经检测,其Cobb值(1800s)可达0.15g/m2,Kit值为12,OTR可达0.038cm3/m2·d·0.1MPa,WVTR为0.023g/m2·24h。
上述包装材料可采用水浸泡超声的方式回收,具体步骤如下:
浸泡水量为将材料全部没过即可,超声工艺的能量为300W/m2。浸泡和超声同时进行时间为10h;之后即可将最外层的涂布层去除或者剥离下来获得回收的铝箔层。
实施例3
一种易回收高阻隔纸铝复合包装材料,具体为多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;
其中纸基层克重在28g/m2范围内的薄页纸,铝箔层厚度在8μm的超薄铝箔;
所采用的粘结剂由如下材料组成:按重量份计:PVA(3份),淀粉(4份)海藻酸钠(1份)及微晶纤维素(2份),水(90份),固含量为10wt%,测量其粘度为3412Pa·s;
所采用的涂布层选用聚己二酸/对苯二甲酸丁二醇酯和聚己内酯共聚物等重量比的混合乳液,其浓度为10wt%,粘度为2780Pa·s;
其具体制备方法如下:
(1)纸基层与铝箔层之间添加粘结剂,之后采用辊式涂布机进行辊压复合,其中辊式涂布机的涂布速度为700m/min,两辊之间的压力为95Mpa;辊压次数不低于5次,之后通过烘干工艺,使其水分挥发达到干燥状态;
烘干工艺选用红外烘干,温度为115℃,烘干时间为90s;确保烘干后的粘结剂含量为10g/m2;
(2)按照比例调配涂布层所用乳液,采用帘式涂布机进行乳液涂布,其中先涂布铝箔层一侧,再涂布纸基层一侧;涂布完成后采用红外烘干,温度为105℃,烘干时间为128s;控制涂布层的涂布量均为干燥后15g/m2;
通过上述干燥即可获得目标易回收高阻隔纸铝复合包装材料;
最终获得的包装材料,经检测,其Cobb值(1800s)可达0.19g/m2,Kit值为12(最高级),OTR可达0.033cm3/m2·d·0.1MPa,WVTR为0.021g/m2·24h。
通过热封工艺,将本实施例制备的纸铝复合包装材料制成密封袋,并将鲜牛奶(无防腐剂添加)注入其内,经过十天的储存,对牛奶进行测试,没有蛋白质变质的现象出现,也没有检测到各种细菌的出现,如大肠杆菌及金色葡萄球菌等,说明本实施例制备获得的复合包装材料有优异的气体阻隔性能,在食品存储方面有显著的效果。
由上述实施例可知,本申请由于采用了可降解的粘结剂和涂层材料,配合可剥离的纸基材料,实现了铝箔层的高效回收,其回收率可达100%,由于现有采用塑料和铝箔制备的复合材料,无法实现降解回收,采用其他回收方式成高,环境污染重,基本无法实现有效的回收利用,可见本申请较之现有技术取得了极佳的经济和社会效益,具有较强的推广价值。
Claims (4)
1.一种易回收高阻隔纸铝复合包装材料,其特征在于:采用多层结构,其中心为通过粘结剂粘结在一起的纸基层和铝箔层,在纸基层及铝箔层外部均涂布一层涂布层;其中纸基层克重在25g/m2 -45g/m2范围内的薄页纸,铝箔层厚度在5μm-10μm范围内的超薄铝箔;
其中所采用的粘结剂为亲水性好及可降解的淀粉、聚乙烯醇、海藻酸钠、壳聚糖、普鲁兰多糖、果胶、天然胶乳、环糊精、纳米纤维素、微晶纤维素及羧甲基纤维素其中的一种或多种复合粘结剂;
所采用的涂布层选用聚己二酸/对苯二甲酸丁二醇酯、聚乳酸、聚丁二酸丁二醇酯、聚己内酯、聚酰胺及乙烯-乙烯醇共聚物中一种或多种树脂复合配制而成的可降解材料乳液;
其制备方法具体步骤如下:
(1)纸基层与铝箔层之间添加粘结剂,之后采用辊式涂布机进行辊压复合,其中辊式涂布机的涂布速度为100 m/min–1000 m/min,两辊之间的压力为20MPa–120 MPa;辊压次数不低于5次,之后通过烘干工艺,使其水分挥发达到干燥状态;
烘干工艺选用红外烘干,温度为80oC-140oC,烘干时间为60 s-150 s;确保烘干后的粘结剂含量为2g/m2-15g/m2;
(2)按照比例调配涂布层所用乳液,采用帘式涂布机或刮刀涂布机进行乳液涂布,其中先涂布铝箔层一侧,再涂布纸基层一侧;涂布完成后采用红外烘干,温度为80oC-150oC,烘干时间为80 s-200 s,控制涂布层的涂布量均为干燥后5g/m2-20g/m2;
通过上述工艺即可获得目标易回收高阻隔纸铝复合包装材料。
2.根据权利要求1所述易回收高阻隔纸铝复合包装材料,其特征在于:所采用的粘结剂浓度为7 wt% -20wt%,粘度为1500 Pa·s-3500 Pa·s,干燥后包装材料中的粘结剂含量为2g/m2-15g/m2。
3.根据权利要求1所述易回收高阻隔纸铝复合包装材料,其特征在于:所采用的涂布层乳液浓度为7wt% -20wt%,粘度为1500Pa·s -4000Pa·s,涂布层的涂布量均为干燥后5g/m2-20g/m2。
4.一种易回收高阻隔纸铝复合包装材料的制备方法,其特征在于:包括如下具体步骤:
(1)纸基层与铝箔层之间添加粘结剂,之后采用辊式涂布机进行辊压复合,其中辊式涂布机的涂布速度为100 m/min–1000 m/min,两辊之间的压力为20MPa–120 MPa;辊压次数不低于5次,之后通过烘干工艺,使其水分挥发达到干燥状态;
烘干工艺选用红外烘干,温度为80oC-140oC,烘干时间为60 s-150 s;确保烘干后的粘结剂含量为2g/m2-15g/m2;
(2)按照比例调配涂布层所用乳液,采用帘式涂布机或刮刀涂布机进行乳液涂布,其中先涂布铝箔层一侧,再涂布纸基层一侧;涂布完成后采用红外烘干,温度为80oC-150oC,烘干时间为80 s-200 s,控制涂布层的涂布量均为干燥后5g/m2-20g/m2;
其中所采用的粘结剂为亲水性好及可降解的淀粉、聚乙烯醇、海藻酸钠、壳聚糖、普鲁兰多糖、果胶、天然胶乳、环糊精、纳米纤维素、微晶纤维素及羧甲基纤维素其中的一种或多种复合粘结剂;
所采用的涂布层选用聚己二酸/对苯二甲酸丁二醇酯、聚乳酸、聚丁二酸丁二醇酯、聚己内酯、聚酰胺及乙烯-乙烯醇共聚物中一种或多种树脂复合配制而成的可降解材料乳液;
通过上述工艺即可获得目标易回收高阻隔纸铝复合包装材料。
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