CN116100909A - 一种环保型复合淋膜纸及其制备方法 - Google Patents
一种环保型复合淋膜纸及其制备方法 Download PDFInfo
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- CN116100909A CN116100909A CN202210989246.0A CN202210989246A CN116100909A CN 116100909 A CN116100909 A CN 116100909A CN 202210989246 A CN202210989246 A CN 202210989246A CN 116100909 A CN116100909 A CN 116100909A
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Abstract
本申请涉及环保型材料技术领域,更具体地说,它涉及一种环保型复合淋膜纸及其制备方法。环保型复合淋膜纸,包括增强复合纸芯和设置于增强复合纸芯两侧的改性PLA淋膜层;所述改性PLA淋膜层的原料母粒由以下重量份的原料制备而成:环糊精40‑60份、PLA 100‑150份、酸酐类助剂0.3‑0.5份、偶联剂0.1‑0.2份、磷酸盐0.5‑0.8份、填料10‑30份。本申请通过多组分的复配改性,保留复合淋膜材料优良性能的同时,兼具绿色环保的优点,可有效减少给环境带来的污染和负荷,因而具有极高的经济效益和环保效益。
Description
技术领域
本申请涉及环保型材料技术领域,更具体地说,它涉及一种环保型复合淋膜纸及其制备方法。
背景技术
淋膜纸是指将塑料粒子通过流延的方式涂覆结合于纸张表面后所形成的复合材料,借助塑料粒子的特性,普遍具有优良的防水和防油性能,被广泛应用于一次性纸杯、纸碗、纸餐盒等纸质容器的生产。
相关技术中的淋膜纸以PE淋膜纸为典型代表,其具有优良的防水和防油性能的同时,易于加工生产,但耐高温性较差,因此也有部分企业采用PP淋膜纸或是两者复配树脂的复合淋膜纸。
但成也萧何,败也萧何,由于PE、PP等塑料粒子不可自然降解的特性,使得此类复合材料无法满足现阶段人们所迎合的环保要求,废弃后亦给环境带来了很大的污染和负荷,因而迫切需要提供一种环保型复合淋膜纸及其制备方法。
发明内容
为保留复合淋膜纸优良性能的同时,兼具绿色环保的优点,从而减少给环境带来的污染和负荷,本申请特提供一种环保型复合淋膜纸及其制备方法。
第一方面,本申请提供一种环保型复合淋膜纸,采用如下的技术方案:
一种环保型复合淋膜纸,包括增强复合纸芯和设置于增强复合纸芯两侧的改性PLA淋膜层;所述改性PLA淋膜层的原料母粒由以下重量份的原料制备而成:环糊精40-60份、PLA 100-150份、酸酐类助剂0.3-0.5份、偶联剂0.1-0.2份、磷酸盐0.5-0.8份、填料10-30份。
通过采用上述技术方案,所制得的改性PLA淋膜层,其符合绿色环保定义的同时,PLA在环糊精、酸酐类助剂、磷酸盐和偶联剂的交联改性作用下,形成了类似CBM树脂的复合体系,克服了原有质脆、韧性差的缺陷;
上述环保型复合淋膜纸在废弃或填埋处理时,其改性PLA淋膜层结构会优先发生降解,并进而引发增强复合纸芯表面至内部结构的破坏,可在3个月达到90%以上降解率,并且主要采用生物降解的方式,因而具有显著的经济效益和环境效益。
优选的,所述改性PLA淋膜层的原料母粒的制备工艺如下:
a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为7.6-8.8后,升温至80-120℃进行拌和,得预制环糊精;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以180-220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒。
通过采用上述技术方案,经上述工艺制得的改性PLA淋膜层的原料母粒,其具有显著环保效益的同时,其本身的韧性和脆性在预制环糊精的交联粘结作用下发生了显著的改善;分析其原因可能如下:上述配比的环糊精、酸酐类助剂和磷酸盐,其在磷酸盐水解后所产生的碱性环境下加热,可有效引发环糊精与酸酐的接枝反应进行,从而在预制环糊精与PLA、偶联剂和填料共混的过程中赋予改性PLA优异的生物相容性、降解性和包络结构。
优选的,所述酸酐类助剂由2-辛烯基琥珀酸酐、马来酸酐和十二烯基琥珀酸酐按重量比1:(1-1.2):(0.3-0.5)组成。
优选的,所述磷酸盐选自磷酸氢钠、磷酸二氢钠、三聚磷酸钠、六偏磷酸钠和焦磷酸钠中的一种或多种。
优选的,所述填料为1-3mm短切可降解植物纤维,选自秸秆纤维、稻壳纤维、玉米纤维和大豆纤维中的一种或多种。
优选的,所述增强复合纸芯包括第一基材层、第二基材层和粘合于第一基材层和第二基材层之间的波纹纸层;
所述波纹纸层的表面均匀开设有多个连接微孔,所述连接微孔内沿波纹纸层的长度方向均插接有加强筋条,所述加强筋条为PLA材质。
通过采用上述技术方案,设置于第一基材层、第二基材层的波纹纸层可通过波纹纸层的波纹结构、以及加强筋条与连接微孔的协同作用,显著改善复合淋膜纸的韧性和力学性能,减少了因增强复合纸芯折皱损毁对其淋膜层或整体的不良影响,且降解时有利于水分和降解微生物的引入。
优选的,所述波纹纸层的波峰、波谷和加强筋条之间填充有可降解胶黏剂。
优选的,所述可降解胶黏剂为预制环糊精,其具体制备步骤如下:
先将环糊精、酸酐类助剂和磷酸盐按重量比1:(0.008-0.012):(0.01-0.02)预混,再加入去离子水,待磷酸盐水解至pH为7.6-8.8后,升温至80-120℃进行拌和,即得预制环糊精。
通过采用上述技术方案,填充于波纹纸层的波峰、波谷和加强筋条之间的可降解胶黏剂或预制环糊精,除能将增强复合纸芯胶黏成硬实的整体,并赋予其优良的力学性能外,在降解过程中还可为微生物提供最为有利的分解环境,包括有机质、氮磷营养、盐度等。
第二方面,本申请提供一种环保型复合淋膜纸的制备方法,采用如下的技术方案:一种环保型复合淋膜纸的制备方法,包括以下步骤:
增强复合纸芯制备;
改性PLA淋膜层的原料母粒制备;
S1、将所得改性PLA淋膜层的原料母粒,置入淋膜机中,利用淋膜机向增强复合纸芯上进行淋膜,淋膜量为10-12g/m2;
S2、再对淋膜完成后的增强复合纸芯进行干燥,干燥温度为25-30℃,干燥时间为1-2h,干燥完成即得到所述的环保型复合淋膜纸。
优选的,增强复合纸芯的制备步骤如下;
先向波纹纸层的连接微孔内对应插接加强筋条,再向第一基材层、第二基材层和波纹纸层的结合面涂覆可降解胶黏剂,然后挤压复合,即得增强复合纸芯。
通过采用上述技术方案制得的环保型复合淋膜纸,其性能均一稳定,均具有优良的力学性能的同时,符合绿色环保的要求,且整体生产较为简易,易于产业化规模化的生产,具有极高的经济效益和环境效益。
综上所述,本申请具有以下有益效果:
1、本申请中由环糊精、PLA、酸酐类助剂、偶联剂、磷酸盐和填料等组分共混改性而成的改性PLA淋膜层,其符合绿色环保定义的同时,在多组分交联改性作用下,形成了CBM树脂类似体系,因而有效克服了原有PLA质脆、韧性差的缺陷,具有极高的经济效益和环境效益;
2、本申请中特定结构的增强复合纸芯可通过波纹纸层的波纹结构、以及加强筋条与连接微孔的协同作用,显著改善复合淋膜纸的韧性和力学性能,从而减少因增强复合纸芯折皱损毁对其淋膜层或整体的不良影响;
3、本申请中填充于增强复合纸芯间的可降解胶黏剂,除能赋予其优良的力学性能外,在降解过程中还可为微生物提供最为有利的分解环境,包括微生物所需有机质、氮磷营养、盐度等;
4、本申请中的制备工艺其整体生产较为简易,易于产业化规模化的生产的同时,所得环保型复合淋膜纸均具有优良的力学性能和降解性能,具有极高的经济效益和环境效益。
附图说明
图1是本申请实施例1-20中环保型复合淋膜纸的整体示意图;
图2是本申请实施例21-26中环保型复合淋膜纸的整体示意图;
图3是图2中环保型复合淋膜纸隐去可降解胶黏剂的部分结构示意图。
附图标记:1、增强复合纸芯;11、第一基材层;12、第二基材层;13、波纹纸层;131、连接微孔;132、加强筋条;2、改性PLA淋膜层。
具体实施方式
以下结合附图1-3对本申请作进一步详细说明。
制备例
制备例1-6
一种改性PLA淋膜层的原料母粒,其原材料各组分及其相应的重量如下表所示(按kg计),并通过如下步骤制备获得:
a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为7.6后,升温至120℃进行拌和,得预制环糊精;
其中环糊精为β-环糊精;酸酐类助剂为2-辛烯基琥珀酸酐;磷酸盐由磷酸氢钠和六偏磷酸钠按重量比1:0.2组成;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒;
其中偶联剂为钛酸酯偶联剂TMC-201;填料为均长3mm的玉米纤维。
表:制备例1-6中环保型复合淋膜纸各组分及其重量(kg)
制备例7
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,通过如下步骤制备获得:a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为8.2后,升温至120℃进行拌和,得预制环糊精;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒。
制备例8
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,通过如下步骤制备获得:a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为8.8后,升温至120℃进行拌和,得预制环糊精;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒。
制备例9
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,通过如下步骤制备获得:a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为7.6后,升温至100℃进行拌和,得预制环糊精;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒。
制备例10
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,通过如下步骤制备获得:a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为7.6后,升温至80℃进行拌和,得预制环糊精;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒。
制备例11
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,酸酐类助剂由2-辛烯基琥珀酸酐、马来酸酐和十二烯基琥珀酸酐按重量比1:0.8:0.6组成。
制备例12
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,酸酐类助剂由2-辛烯基琥珀酸酐、马来酸酐和十二烯基琥珀酸酐按重量比1:1:0.3组成。
制备例13
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,酸酐类助剂由2-辛烯基琥珀酸酐、马来酸酐和十二烯基琥珀酸酐按重量比1:1.1:0.4组成。
制备例14
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,酸酐类助剂由2-辛烯基琥珀酸酐、马来酸酐和十二烯基琥珀酸酐按重量比1:1.2:0.5组成。
制备例15
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,磷酸盐由磷酸氢钠和磷酸二氢钠按重量比1:0.3组成。
制备例16
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,磷酸盐由磷酸氢钠、磷酸二氢钠和六偏磷酸钠按重量比1:0.3:0.2组成。
制备例17
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,磷酸盐由磷酸氢钠、磷酸二氢钠和焦磷酸钠按重量比1:0.3:0.5组成。
制备例18
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,填料为平均长度1mm的玉米纤维。
制备例19
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,填料为平均长度3mm的大豆纤维。
制备例20
一种改性PLA淋膜层的原料母粒,与制备例1的区别之处在于,填料由平均长度1mm的玉米纤维和平均长度为3mm的大豆纤维按重量比1:1.8组成。
制备例21
一种增强复合纸芯,参见图2-3,包括厚度为1mm的第一基材层11和第二基材层12,以及粘合于第一基材层11和第二基材层12之间厚度为0.5mm、波高为3mm的波纹纸层13;
波纹纸层13的表面沿其宽度方向均匀开设有多个连接微孔131,连接微孔的孔径为1mm、开设密度为2个/cm,连接微孔131内沿波纹纸层13的长度方向均插接有径粗1mm、PLA材质的加强筋条132;
波纹纸层13的波峰、波谷和加强筋条132之间填充有可降解胶黏剂,可降解胶黏剂为环糊精;
并采用如下制备步骤制得;
先向波纹纸层13的连接微孔131内对应插接加强筋条132,再向第一基材层11、第二基材层12和波纹纸层13的结合面涂覆可降解胶黏剂,然后挤压复合,即得增强复合纸芯1。
制备例22
一种增强复合纸芯,与制备例21的区别之处在于,连接微孔132的孔径的开设密度为5个/cm。
制备例23
一种增强复合纸芯,与制备例21的区别之处在于,连接微孔132的孔径为2mm、开设密度为2个/cm,加强筋条132的径粗为2mm。
制备例24
一种增强复合纸芯,与制备例21的区别之处在于,可降解胶黏剂为预制环糊精,其具体制备步骤如下:
先将环糊精、酸酐类助剂和磷酸盐按重量比1:0.006:0.024预混,再加入去离子水,待磷酸盐水解至pH为8.2后,升温至120℃进行拌和,即得预制环糊精。
制备例25
一种增强复合纸芯,与制备例21的区别之处在于,可降解胶黏剂为预制环糊精,其具体制备步骤如下:
先将环糊精、酸酐类助剂和磷酸盐按重量比1:0.008:0.01预混,再加入去离子水,待磷酸盐水解至pH为8.2后,升温至120℃进行拌和,即得预制环糊精。
制备例26
一种增强复合纸芯,与制备例21的区别之处在于,可降解胶黏剂为预制环糊精,其具体制备步骤如下:
先将环糊精、酸酐类助剂和磷酸盐按重量比1:0.12:0.02预混,再加入去离子水,待磷酸盐水解至pH为8.2后,升温至120℃进行拌和,即得预制环糊精。
性能检测试验
选取各实施例和对比例中制得的复合淋膜纸作为测试对象,每组试样平行设置有三组,然后分别测试其力学性能和降解性能,最终测试结果取平均值记入,具体检测步骤和检测标准如下:
1)力学性能:以环保型复合淋膜纸的抗张强度KN.m和撕裂度/mN进行表征,可参见GB/T12914-2018《纸和纸板抗张强度的测定恒速拉伸法(20mm/min)》和GB/T 455-2002《纸和纸板撕裂度的测定》;
2)降解性能:将试样填埋到到土壤中进行降解试验,具体检测步骤和检测标准参照GB/T39951-2021《一次性纸制品降解性能评价方法》进行,固定天数45d、90d后,记录其残余重量,并计算得到失重率。
实施例
实施例1-6
一种环保型复合淋膜纸,其改性PLA淋膜层的原料母粒的使用情况如下表所示,并通过如下步骤制备获得:
S1、将所得改性PLA淋膜层的原料母粒,置入淋膜机中,利用淋膜机向增强复合纸芯上进行淋膜,淋膜量为10g/m2;
S2、再对淋膜完成后的增强复合纸芯进行干燥,干燥温度为30℃,干燥时间为2h,干燥完成即得到所述的环保型复合淋膜纸;
其中增强复合纸芯,参照图1,包括厚度为1mm的第一基材层11和第二基材层12,以及粘合于第一基材层11和第二基材层12之间厚度为0.5mm、波高为3mm的波纹纸层13,粘合用可降解胶黏剂为环糊精。
表:实施例1-6中改性PLA淋膜层的原料母粒使用情况对照表
组别 | 改性PLA淋膜层的原料母粒 |
实施例1 | 由制备例1制得 |
实施例2 | 由制备例2制得 |
实施例3 | 由制备例3制得 |
实施例4 | 由制备例4制得 |
实施例5 | 由制备例5制得 |
实施例6 | 由制备例6制得 |
对比例1
一种复合淋膜纸,与实施例1的区别之处在于,所用淋膜层的原料母由以下重量份的原料制备而成:PLA树脂150kg、KY1010抗氧化剂0.5kg、粒径0.3um的碳酸钙30kg。
抽取上述实施例1-6和对比例1中制得的复合淋膜纸,按上述测量步骤和测量标准测试其力学性能和降解性能,测试结果取平均值记入下表。
表:实施例1-6、对比例1性能检测结果
从上表中可以看出,实施例1-6中制得环保型复合淋膜纸其均具有优良的力学性能,其抗张强度高达4.21-4.24KN.m,撕裂度高达462-468mN,相比于使用PLA淋膜层的对比例1分别提升了8.5-9.3%、12.4-13.9%;
且所得环保型复合淋膜纸还具有极优的环境效益和降解能力,其45d的失重率为41.2-44.2%、90d的失重率高达91.2-92.5%,降解速率高效的同时较为彻底,相比于对比例1仍有不同程度提升;
可见所制得的改性PLA淋膜层,其符合绿色环保定义的同时,PLA在环糊精、酸酐类助剂、磷酸盐和偶联剂的交联改性作用下,形成了类似CBM树脂的复合体系,克服了原有质脆、韧性差的缺陷;
上述环保型复合淋膜纸在废弃或填埋处理时,其改性PLA淋膜层结构会优先发生降解,并进而引发增强复合纸芯表面至内部结构的破坏,可在3个月达到90%以上降解率,并且主要采用生物降解的方式,因而具有显著的经济效益和环境效益,具体理论依据可参见实施例1-6。
实施例7-10
一种环保型复合淋膜纸,与实施例1的区别之处在于,其改性PLA淋膜层的原料母粒的使用情况不同,具体如下表所示:
表:实施例7-10中改性PLA淋膜层的原料母粒使用情况对照表
对比例2
一种复合淋膜纸,与实施例1的区别之处在于,改性PLA淋膜层的原料母粒的制备步骤如下:
先将环糊精、酸酐类助剂和磷酸盐升温至120℃进行拌和,再依次加入PLA、偶联剂和填料,并于真空条件下干燥、共混,最后以220℃进行熔融挤出,即得改性PLA淋膜层的原料母粒。
抽取上述实施例7-10和对比例2中制得的复合淋膜纸,按上述测量步骤和测量标准测试其力学性能和降解性能,测试结果取平均值记入下表。
表:实施例7-10、对比例2性能检测结果
从上表中可以看出,实施例1、7-10中制得环保型复合淋膜纸其均具有优良的力学性能,其抗张强度高达4.20-4.22KN.m,撕裂度高达460-465mN,相比于对比例2分别提升了4.5-5.0%、6.7-7.9%;
且所得环保型复合淋膜纸还具有极优的环境效益和降解能力,其45d的失重率为42.5-43.6%、90d的失重率高达90.8-92.2%,降解速率高效的同时较为彻底,相比于对比例2均有不同程度提升;
可见经上述特定工艺制得的改性PLA淋膜层的原料母粒,其具有显著环保效益的同时,其本身的韧性和脆性在预制环糊精的交联粘结作用下发生了显著的改善,而仅是简单混合的对比例2显然没有达到预期效果;
分析其原因可能如下:上述配比的环糊精、酸酐类助剂和磷酸盐,其在磷酸盐水解后所产生的碱性环境下加热,可有效引发环糊精与酸酐的接枝反应进行,从而在预制环糊精与PLA、偶联剂和填料共混的过程中赋予改性PLA优异的生物相容性、降解性和包络结构。
实施例11-14
一种环保型复合淋膜纸,与实施例1的区别之处在于,其改性PLA淋膜层的原料母粒的使用情况不同,具体如下表所示:
表:实施例11-14中改性PLA淋膜层的原料母粒使用情况对照表
组别 | 改性PLA淋膜层的原料母粒 |
实施例11 | 由制备例11制得 |
实施例12 | 由制备例12制得 |
实施例13 | 由制备例13制得 |
实施例14 | 由制备例14制得 |
抽取上述实施例11-14中制得的复合淋膜纸,按上述测量步骤和测量标准测试其力学性能和降解性能,测试结果取平均值记入下表。
表:实施例11-14性能检测结果
从上表中可以看出,实施例11-14中制得环保型复合淋膜纸其均具有优良的力学性能,其抗张强度高达4.22-4.26KN.m,撕裂度高达463-473mN,可见多组分的酸酐类助剂具有一定复配效果;
且所得环保型复合淋膜纸还具有极优的环境效益和降解能力,其45d的失重率为43.1-43.8%、90d的失重率高达91.5-92.5%,降解速率高效的同时较为彻底,相比于实施例1仅使用2-辛烯基琥珀酸酐均进一步提升。
实施例15-17
一种环保型复合淋膜纸,与实施例1的区别之处在于,其改性PLA淋膜层的原料母粒的使用情况不同,具体如下表所示:
表:实施例15-17中改性PLA淋膜层的原料母粒使用情况对照表
组别 | 改性PLA淋膜层的原料母粒 |
实施例15 | 由制备例15制得 |
实施例16 | 由制备例16制得 |
实施例17 | 由制备例17制得 |
对比例3
一种复合淋膜纸,与实施例1的区别之处在于,其改性PLA淋膜层的原料母粒的制备原料中不包含磷酸盐。
抽取上述实施例15-17、对比例3中制得的复合淋膜纸,按上述测量步骤和测量标准测试其力学性能和降解性能,测试结果取平均值记入下表。
表:实施例15-17、对比例3性能检测结果
从上表中可以看出,实施例1、15-17中制得环保型复合淋膜纸其均具有优良的力学性能,其抗张强度高达4.21-4.23KN.m,撕裂度高达462-465mN,相比于不含磷酸盐的对比例3分别提升6.3-6.8%、9.5-10.2%;
且所得环保型复合淋膜纸还具有极优的环境效益和降解能力,其45d的失重率为42.9-43.2%、90d的失重率高达91.2-91.8%,降解速率高效的同时较为彻底,相比于对比例3其降解率均进一步提升。
此外由实施例15-17的数据可以看出,磷酸盐之间具有一定复配效果,但并非种类越多越好,最优选为磷酸氢钠和磷酸二氢钠的复配使用,其他磷酸盐的复配,则会因为其基团的改变而对最终改性产生一定影响。
实施例18-20
一种环保型复合淋膜纸,与实施例1的区别之处在于,其改性PLA淋膜层的原料母粒的使用情况不同,具体如下表所示:
表:实施例18-20中改性PLA淋膜层的原料母粒使用情况对照表
组别 | 改性PLA淋膜层的原料母粒 |
实施例18 | 由制备例18制得 |
实施例19 | 由制备例19制得 |
实施例20 | 由制备例20制得 |
抽取上述实施例18-20中制得的复合淋膜纸,按上述测量步骤和测量标准测试其力学性能和降解性能,测试结果取平均值记入下表。
表:实施例18-20性能检测结果
从上表中可以看出,实施例1、18-20中制得环保型复合淋膜纸其均具有优良的力学性能,其抗张强度高达4.21-4.22KN.m,撕裂度高达461-465mN,长径大豆纤维及其复配纤维对力学性能的增强效果较优;
且所得环保型复合淋膜纸还具有极优的环境效益和降解能力,其45d的失重率为42.9-43.2%、90d的失重率高达91.1-91.2%,降解速率高效的同时较为彻底,短径玉米纤维或及其复配纤维的降解性能更优。
实施例21-26
一种环保型复合淋膜纸,与实施例1的区别之处在于,其增强复合纸芯的使用情况不同,具体如下表所示:
表:实施例21-26中增强复合纸芯使用情况对照表
组别 | 增强复合纸芯 |
实施例21 | 由制备例21制得 |
实施例22 | 由制备例22制得 |
实施例23 | 由制备例23制得 |
实施例24 | 由制备例24制得 |
实施例25 | 由制备例25制得 |
实施例26 | 由制备例26制得 |
抽取上述实施例21-26中制得的复合淋膜纸,按上述测量步骤和测量标准测试其力学性能和降解性能,测试结果取平均值记入下表。
表:实施例21-26性能检测结果
从上表中可以看出,实施例21-26中制得环保型复合淋膜纸其均具有优良的力学性能,其抗张强度高达4.65-4.73KN.m,撕裂度高达488-496mN,相比于实施例1分别提升10.5-12.4%、5.6-7.4%;
且所得环保型复合淋膜纸还具有极优的环境效益和降解能力,其45d的失重率为43.6-44.5%、90d的失重率高达92.1-94.0%,降解速率高效的同时较为彻底,相比于实施例1均有不同程度提升;
可见设置于第一基材层、第二基材层的波纹纸层可通过波纹纸层的波纹结构、以及加强筋条与连接微孔的协同作用,显著改善复合淋膜纸的韧性和力学性能,减少了因增强复合纸芯折皱损毁对其淋膜层或整体的不良影响,且降解时有利于水分和降解微生物的引入;
并且由实施例24-26还可以看出,填充于波纹纸层的波峰、波谷和加强筋条之间的可降解胶黏剂或预制环糊精,除能将增强复合纸芯胶黏成硬实的整体,并赋予其优良的力学性能外,在降解过程中还可为微生物提供最为有利的分解环境,包括有机质、氮磷营养、盐度等。
本具体实施例仅仅是对本申请的解释,其并不是对本申请的限制,本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性贡献的修改,但只要在本申请的权利要求范围内都受到专利法的保护。
Claims (10)
1.一种环保型复合淋膜纸,其特征在于,包括增强复合纸芯(1)和设置于增强复合纸芯(1)两侧的改性PLA淋膜层(2);
所述改性PLA淋膜层(2)的原料母粒由以下重量份的原料制备而成:环糊精40-60份、PLA 100-150份、酸酐类助剂0.3-0.5份、偶联剂0.1-0.2份、磷酸盐 0.5-0.8份、填料 10-30份。
2.根据权利要求1所述的环保型复合淋膜纸,其特征在于,所述改性PLA淋膜层(2)的原料母粒的制备工艺如下:
a、先将环糊精、酸酐类助剂和磷酸盐预混,再加入去离子水,待磷酸盐水解至pH为7.6-8.8后,升温至80-120℃进行拌和,得预制环糊精;
b、然后将预制环糊精、PLA、偶联剂和填料于真空条件下干燥、共混,最后以180-220℃进行熔融挤出,即得改性PLA淋膜层(2)的原料母粒。
3.根据权利要求1所述的环保型复合淋膜纸,其特征在于,所述酸酐类助剂由2-辛烯基琥珀酸酐、马来酸酐和十二烯基琥珀酸酐按重量比1:(1-1.2):(0.3-0.5)组成。
4.根据权利要求1所述的环保型复合淋膜纸,其特征在于,所述磷酸盐选自磷酸氢钠、磷酸二氢钠、三聚磷酸钠、六偏磷酸钠和焦磷酸钠中的一种或多种。
5.根据权利要求1所述的环保型复合淋膜纸,其特征在于,所述填料为1-3mm短切可降解植物纤维,选自秸秆纤维、稻壳纤维、玉米纤维和大豆纤维中的一种或多种。
6.根据权利要求1所述的环保型复合淋膜纸,其特征在于,所述增强复合纸芯包括第一基材层(11)、第二基材层(12)和粘合于第一基材层(11)和第二基材层(12)之间的波纹纸层(13);
所述波纹纸层(13)的表面均匀开设有多个连接微孔(131),所述连接微孔(131)内沿波纹纸层(13)的长度方向均插接有加强筋条(132),所述加强筋条(132)为PLA材质。
7.根据权利要求6所述的环保型复合淋膜纸,其特征在于,所述波纹纸层(13)的波峰、波谷和加强筋条(132)之间填充有可降解胶黏剂。
8.根据权利要求7所述的环保型复合淋膜纸,其特征在于,所述可降解胶黏剂为预制环糊精,其具体制备步骤如下:
先将环糊精、酸酐类助剂和磷酸盐按重量比1:(0.008-0.012):(0.01-0.02)预混,再加入去离子水,待磷酸盐水解至pH为7.6-8.8后,升温至80-120℃进行拌和,即得预制环糊精。
9.权利要求1-8任一所述的环保型复合淋膜纸的制备方法,其特征在于,包括以下步骤:
增强复合纸芯(1)制备;
改性PLA淋膜层(2)的原料母粒制备;
S1、将所得改性PLA淋膜层(2)的原料母粒,置入淋膜机中,利用淋膜机向增强复合纸芯(1)上进行淋膜,淋膜量为10-12g/m2;
S2、再对淋膜完成后的增强复合纸芯(1)进行干燥,干燥温度为25-30℃,干燥时间为1-2h,干燥完成即得到所述的环保型复合淋膜纸。
10.根据权利要求9所述的环保型复合淋膜纸的制备方法,其特征在于,增强复合纸芯(1)的制备步骤如下;
先向波纹纸层(13)的连接微孔(131)内对应插接加强筋条(132),再向第一基材层(11)、第二基材层(12)和波纹纸层(13)的结合面涂覆可降解胶黏剂,然后挤压复合,即得增强复合纸芯(1)。
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