CN116787893A - 一种高温蒸煮封盖易揭膜及其制备方法 - Google Patents
一种高温蒸煮封盖易揭膜及其制备方法 Download PDFInfo
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Abstract
本申请涉及高分子材料领域,具体公开了一种高温蒸煮封盖易揭膜及其制备方法。一种高温蒸煮封盖易揭膜,依次为外层、中间层和内层,内层包括以下原料:高密度聚乙烯、乙烯‑丁烯共聚物、PPA助剂、线性低密度聚乙烯、爽滑剂、聚丙烯;中层包括以下原料:茂金属超低密度聚乙烯、高密度聚乙烯、线性低密度聚乙烯、茂金属线性低密度聚乙烯;外层包括以下原料:高密度聚乙烯、线性低密度聚乙烯、聚丙烯。本申请的高温蒸煮封盖易揭膜具有在125℃下蒸煮30min后无分层现象,并且热封窗口宽,热封强度适中,封口易撕开,揭开时平滑无顿挫感、阻隔性能和抗污染性能好,产品保质期更长的优点。
Description
技术领域
本申请涉及高分子材料技术领域,更具体地说,它涉及一种高温蒸煮封盖易揭膜及其制备方法。
背景技术
易揭膜材料已经被广泛应用于各种包装中,例如用易揭膜材料直接加工成各种包装袋,或者用于PP类材质的碗状、杯状、桶状、盒状容器的盖膜。采用易揭盖膜与嵌段共聚PP材质的容器结合的方式制备包装产品,能取代包装能耗大、储运成本高、占用空间大的玻璃瓶罐和马口铁罐。
由于水果罐头、肉类罐头、鱼罐头、粥类等包装在生产过程中需要经受110℃~121℃高温灭菌处理半个小时到一个小时,传统复合软包装易揭盖膜与嵌段共聚PP杯体结合的包装技术主要用于常温或低温果冻、酸奶、布丁等加工食品包装领域。此种盖膜与嵌段共聚PP杯的结合体不能承受高温加热处理,高温加热处理后容易出现封口性差、阻隔性抗污染性差等问题。
现有技术中,申请号为CN113427871的中国发明专利申请文件公开了一种可耐高温蒸煮的易揭膜材料,由电晕层、中间层和热封层共挤而成,其中电晕层材料为茂金属嵌段共聚PP或茂金属中密度聚乙烯与高密度聚乙烯的混合物;中间层材料为茂金属高密度聚乙烯;所述热封层材料由高密度聚乙烯(HDPE)、嵌段共聚PP(PP)和聚丁烯(PB)共聚而成,虽然可耐121℃/30min高温蒸煮,但由于热封层是PE与PP共挤,二者的相容性不好,剥离时容易拉丝,揭开处的痕迹粗糙且揭膜表面出现破损,而导致膜破损处易出现撕裂,残留于容器上,使得盖膜不易完整揭开。
针对上述中的相关技术,发明人发现目前的易揭盖膜虽然满足热封PP材质杯体,但不耐蒸煮,蒸煮后热封处易开口,或者满足高温蒸煮效果,但不易完整揭开,易残留、拉丝
发明内容
为了同时满足耐高温蒸煮和易揭开的效果,本申请提供一种高温蒸煮封盖易揭膜及其制备方法。
第一方面,本申请提供一种高温蒸煮封盖易揭膜,采用如下的技术方案:
一种高温蒸煮封盖易揭膜,由外至内依次为外层、中间层和内层,所述内层包括以下重量份的原料:25-35份高密度聚乙烯、15-25份乙烯-丁烯共聚物、0.6-1份PPA助剂、25-35份线性低密度聚乙烯、1.5-2.5份爽滑剂、15-25份聚丙烯、2-2.8份开口剂;
所述中层包括以下重量份的原料:25-35份茂金属超低密度聚乙烯、25-35份高密度聚乙烯、15-25份线性低密度聚乙烯、15-25份茂金属线性低密度聚乙烯、0.6-1份PPA助剂;
所述外层包括以下重量份的原料:35-45份高密度聚乙烯、35-45份线性低密度聚乙烯、15-25份聚丙烯、0.6-1份PPA助剂。
通过采用上述技术方案,在外层和内层中使用HDPE、线性低密度聚乙烯,并配合聚丙烯,以上述用量进行配合,实现了较高的耐温性效果,在高温125℃下蒸煮30min不会封口揭开,而且还能达到稳定的热封效果,实现易撕、耐高温的效果;虽然内层和外层中添加聚丙烯,但内层中含有乙烯-丁烯共聚物,在中层内添加两种不同的茂金属线性低密度聚乙烯,能改善各原料的相容性,实现层间紧密贴合,揭膜时不易分层,不出现拉丝等现象。
可选的,由外至内依次为外层、中间层和内层,所述内层包括以下重量份的原料:30-35份高密度聚乙烯、15-20份乙烯-丁烯共聚物、0.6-0.8份PPA助剂、25-30份线性低密度聚乙烯、1.5-2份爽滑剂、15-20份聚丙烯、2-2.4份开口剂;
所述中层包括以下重量份的原料:30-35份茂金属超低密度聚乙烯、30-35份高密度聚乙烯、20-25份线性低密度聚乙烯、20-25份茂金属线性低密度聚乙烯、0.8-1份PPA助剂;
所述外层包括以下重量份的原料:40-45份高密度聚乙烯、40-45份线性低密度聚乙烯、20-25份聚丙烯、0.8-1份PPA助剂。
通过采用上述技术方案,外层、中层和内层的原料用量更加精确,能实现更好的耐高温、易揭、热封效果。
所述内层和外层中聚丙烯选自嵌段共聚PP、无规则共聚PP、均聚PP中的一种。
通过采用上述技术方案,在内层和外层中使用嵌段共聚PP、无规则共聚PP、均聚PP,改善易揭膜的抗冲性和耐撕裂性。
可选的,所述内层和外层中嵌段共聚PP的熔融指数为2.5-3.5g/10min,密度为0.9-1g/cm3。
通过采用上述技术方案,以上密度和熔融指数的嵌段共聚PP具有高抗冲击性,耐热性好,能改善易揭膜的耐冲击性和耐蒸煮能力。
可选的,所述内层和外层中无规共聚PP的熔融指数为9.5-10g/10min,密度为0.9-0.94g/cm3。
通过采用上述技术方案,以上熔融指数和密度的无规共聚PP的拉伸强度高,热变形温度高,耐热性好。
可选的,所述内层和外层中均聚PP的熔融指数为0.5-1g/10min,密度为0.9-0.95g/cm3。
通过采用上述技术方案,以上密度和熔融指数的均聚PP具有较好的耐热性、高机械强度和良好的耐磨性,能改善易揭膜的力学强度和耐热性。
可选的,所述外层、中层和内层中的线性低密度聚乙烯的密度为0.90-0.94g/cm3,熔融指数为0.9-1.2g/10min。
通过采用上述技术方案,此密度和熔融指数的线性低密度聚乙烯具有较高的软化温度和熔融温度,强度大、韧性好、刚性大、耐热、耐寒,还具有良好的耐环境应力开裂性,耐冲击强度和耐撕裂强度等性能好,与高密度聚乙烯、聚丙烯配合使用,能改善易揭膜的耐热性、易揭效果。
可选的,所述中层中茂金属线性低密度聚乙烯的密度为0.94-0.95g/cm3,熔融指数为0.9-1g/10min。
通过采用上述技术方案,中层内的茂金属低密度聚乙烯的熔融指数小,能改善中层内高密度聚乙烯、线性低密度聚乙烯与外层、内层中的高密度聚乙烯、PP和线性低密度聚乙烯的相容性,防止易揭膜出现晶点、僵块、脱层。
可选的,所述内层和外层中高密度聚乙烯的密度为0.956-0.96g/cm3,熔融指数为1.0-1.2g/10min;
所述中层中高密度聚乙烯的密度为0.946-0.95g/cm3,熔融指数为6-6.5g/10min。
通过采用上述技术方案,内层和外层中选用的高密度聚乙烯的热变形温度高,耐热性好,属于高耐热HDPE材料,能改善易揭膜的耐热性能;中层内使用热变形温度稍低的高密度聚乙烯,其流动速率高,分子量大,力学性能好。
可选的,所述中层内茂金属超低密度聚乙烯的密度为0.916-0.92g/cm3,熔融指数为0.5-1g/10min。
通过采用上述技术方案,以上密度和熔融指数的茂金属超低密度聚乙烯具有接触的拉伸性、抗冲击性和耐穿刺性。
可选的,所述外层、内层和中层内均还添加有抗氧化剂,所述抗氧化剂的用量均为0.5-1重量份。
通过采用上述技术方案,抗氧化剂能防止在高温条件下,易揭膜产生表面过度聚合、氧化、焦化现象,使薄膜表面不出现晶点和糊料,改善加工性能,改善产品的表观质量。
第二方面,本申请提供一种高温蒸煮封盖易揭膜的制备方法,采用如下的技术方案:
一种高温蒸煮封盖易揭膜的制备方法,包括以下步骤:
将外层、中层和内层的原料分别混合均匀,经加热熔融、挤出、吹胀冷却、牵引定型、电晕处理、收卷。
通过采用上述技术方案,使用温度为0-5℃的冷风进行风冷,改善膜泡的稳定性。
可选的,还包括以下后处理步骤:在所得高温蒸煮封盖易揭膜的外层涂刷含有石墨烯、环氧树脂、聚酰胺的混合乳液,干燥后将高温蒸煮封盖易揭膜涂覆混合乳液的一侧放置在PFDS的上方,在100-110℃、60-70kPa的条件下真空蒸发30-35min。
通过采用上述技术方案,易揭膜在对食品进行包装时,对于水和氧气的阻隔能力会影响食品的保质期;因此将制成的易揭膜进行后处理,在外层上先涂刷一层含有石墨烯的环氧树脂乳液,石墨烯的片层结构,能延长水蒸气和氧气的渗透路径,降低水蒸气和氧气的渗透量,提高阻隔性,而PDFS真空蒸发在外层上,能为外层提供更高的氟密度,降低外层的表面自由能,提高其疏水性,增加水蒸气的渗透阻力,提高水蒸气的阻隔能力。
综上所述,本申请具有以下有益效果:
1、由于本申请采用耐高温的高密度聚乙烯和密度较高的线性低密度聚乙烯、PP相配合,通过调整各原料的用量,实现了易揭膜的耐温性、热封强度适中,封口易撕开,撕开痕迹光滑、无拉丝,而且能够实现吹膜产业化加工,保证吹膜的产品质量。
2、本申请中优选在中层内使用低熔融指数的茂金属线性低密度聚乙烯,能改善高密度聚乙烯、线性低密度聚乙烯等与外层、内层中原料的相容性,使膜层不易分层,不易出现晶点、僵块,改善易揭膜的表观质量。
3、本申请中优选在易揭膜的外层上线涂覆含有石墨烯的环氧树脂乳液,再经过真空蒸发PDFS,实现外层膜的阻隔改性,提高易揭膜的阻水、阻氧效果,改善易揭膜对食品的储存能力。
具体实施方式
实施例
表1高温蒸煮封盖易揭膜中各原料的来源
实施例1:一种高温蒸煮封盖易揭膜,依次包括外层、中层和内层,各层原料来源如表1所示,原料用量如表2所示,表2中的内层各原料:高密度聚乙烯的熔融指数(190℃/2.16kg)为1g/10min,密度为0.956g/cm3,型号为F920A,线性低密度聚乙烯的熔融指数(190℃/2.16kg)为1g/10min,密度为0.92g/cm3,型号为SP3210,聚丙烯为嵌段共聚PP,嵌段共聚PP的熔融指数(230℃/2.16kg)为2.5g/10minL,密度为0.9g/cm3,型号为K8003;中层内各原料:茂金属超低密度聚乙烯的密度为0.916g/cm3,熔融指数(190℃/2.16kg)为0.5g/10min,型号为X8656;高密度聚乙烯密度为0.946g/cm3,熔融指数(190℃/2.16kg)为6g/10min;线性低密度聚乙烯的熔融指数(190℃/2.16kg)为1.9g/10min,密度为0.925g/cm3,型号为SP2520,茂金属线性低密度聚乙烯的密度为0.94g/cm3,熔融指数(190℃/2.16kg)为0.9g/10min,型号为4009MC;外层中各原料:高密度聚乙烯的熔融指数(190℃/2.16kg)为1g/10min,密度为0.956g/cm3,型号为F920A,线性低密度聚乙烯的熔融指数(190℃/2.16kg)为1g/10min,密度为0.92g/cm3,型号为SP3210,聚丙烯为嵌段共聚PP,嵌段共聚PP的熔融指数(230℃/2.16kg)为2.5g/10minL,密度为0.9g/cm3,型号为K8003。
上述高温蒸煮封盖易揭膜的制备方法,包括以下步骤:
将外层、中层和内层的原料分别混合均匀,分别送入外层、中层和内层挤出机中进行加热熔融,将熔融得到的胶液输送至模头,挤出吹塑得到膜泡,膜泡经风冷冷却后,经牵引定型,经导辊进入电晕装置中进行电晕处理,收卷,制得厚度为70μm的高温蒸煮封盖易揭膜,挤出机的各区温度如表3所示,冷风温度为5℃,螺杆转速:中层为52r/min,内层为45r/min,外层为45r/min。
表2实施例1-6中高温蒸煮封盖易揭膜的原料用量
表3挤出机的外层、内层和中层的各区温度
实施例2-6:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,原料用量如表2所示。
实施例7:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,内层和外层中的聚丙烯为无规共聚PP,熔融指数为10g/10min,密度为0.9g/cm3,型号为AW564G。
实施例8:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,内层和外层中聚丙烯为均聚PP,熔融指数为0.5g/10min,密度为0.9g/cm3,型号为1005。
实施例9:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,将制成的高温蒸煮封盖易揭膜进行以下后处理:在高温蒸煮封盖易揭膜的外层上涂刷含有1kg石墨烯、2kg环氧树脂、1kg聚酰胺和3.7kg二甲苯的混合乳液,干燥,将高温蒸煮封盖易揭膜上涂覆混合乳液的一侧放置在PFDS的上方,在100℃、70kPa的条件下真空蒸发30min。
实施例10:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,将制成的高温蒸煮封盖易揭膜进行以下后处理:在高温蒸煮封盖易揭膜的外层上涂刷含有1kg石墨烯、2kg环氧树脂、1kg聚酰胺和3.7kg二甲苯的混合乳液,干燥。
实施例11:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,将制成的高温蒸煮封盖易揭膜进行以下后处理:在高温蒸煮封盖易揭膜的外层放置在PFDS的上方,在100℃、70kPa的条件下真空蒸发30min。
对比例
对比例1:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,使用中层内高密度聚乙烯等量替代外层中的高密度聚乙烯。
对比例2:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,使用等量密度为0.918g/cm3,熔融指数(190℃/2.16kg)为3.5g/10min的MLLDPE替代外层中的线性低密度聚乙烯。
对比例3:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,内层中未添加高密度聚乙烯。
对比例4:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,内层中未添加线性低密度聚乙烯。
对比例5:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,内层中未添加聚丙烯。
对比例6:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,内层中未添加乙烯-丁烯共聚物。
对比例7:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,中层内未添加茂金属线性低密度聚乙烯。
对比例8:一种高温蒸煮封盖易揭膜,与实施例1的区别在于,中层内使用线性低密度聚乙烯SP3210等量替代茂金属线性低密度聚乙烯。
对比例9:一种可耐高温蒸煮的易揭膜材料,由电晕层、中间层和热封层共挤而成,电晕层、中间层和热封层材料的质量比为7:10:3,电晕层材料为茂金属中密度聚乙烯50wt%与高密度聚乙烯50wt%混合;中间层材料为茂金属高密度聚乙烯;热封层材料由高密度聚乙烯(HDPE)、聚丙烯(PP)和聚丁烯(PB1)共聚而成;茂金属中密度聚乙烯的密度为0.934g/cm3,熔融指数为0.9g/10min;所述高密度聚乙烯的密度为0.961g/cm3,熔融指数为0.85g/10min;所述茂金属高密度聚乙烯的熔融指数为0.7g/10min。
性能检测试验
一、力学强度和热封性检测:按照上述方法制备高温蒸煮封盖易揭膜,并参考以下方法检测易揭膜的性能,每项性能均检测3组试样,取平均值,将检测结果记录于表4、表5和表6中。
1.拉伸强度:按照GB/T13022-1991《塑料薄膜拉伸性能试验方法》进行检测;
2、断裂伸长率:按照GB/T13022-1991《塑料薄膜拉伸性能试验方法》进行检测;
3、撕裂强度:按照GB/T16578-1996《塑料薄膜和薄片耐撕裂性能试验方法》进行检测;
4、热封强度:按照QB-T2358《塑料包装的热封强度测试方法》进行检测;
5、与PP杯体热封强度(0.2MPa,1s)和揭开痕迹:按照QB-T2358《塑料包装的热封强度测试方法》进行检测,并揭开易揭膜,观察易揭膜和揭开痕迹;
6、油浴试验:将制成的易揭膜中折叠,使内层相互接触,直接放置在硅油中,升温加热,保温30min,观察易揭膜是否出现粘连或收缩现象。
表4实施例1-6制备的耐高温封盖易揭膜的性能检测
由表4中数据可以看出,实施例1-6制成的易揭膜在125℃的油浴中保温30min,不出现收缩和粘连,而在130℃的油浴中保温30min,也仅出现轻微粘连,具有较高的耐高温性能,用于PP杯体封盖,经加热后,能保持较强的物理性能;而且与PP杯体的热封强度不高,易揭开。
表5实施例8-11和对比例1-3制备的易揭膜的性能检测
由表5内数据可以看出,实施例7中使用无规共聚PP,制成的易揭膜与实施例1相比,力学强度稍有下降,耐热性稍有减弱;实施例8中使用均聚PP,与实施例1相比,其制成的易揭膜耐热性减弱。
实施例9-11中对易揭膜的外层进行后处理,获得的易揭膜拉丝强度、断裂伸长率和撕裂强度有所改善;而对比例1中使用中层内热形变温度减小的高密度聚乙烯替代外层中热形变温度高的高密度聚乙烯,制成的易揭膜耐热性有所下降,高温蒸煮下易产生粘连、收缩现象;对比例2中使用密度较低的茂金属线性低密度聚乙烯,制成的易揭膜拉伸强度等力学性能稍有下降,而且耐高温蒸煮能力减弱。
表6对比例3-9制备的耐高温蒸煮封盖易揭膜的性能检测
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结合表6内数据,对比例3中内层中未添加高密度聚乙烯、对比例4中内层未添加线性低密度聚乙烯,对比例5中内层中未添加PP,对比例6的内层中未添加乙烯-丁烯共聚物,由表6内数据可以看出,实施例3-6制备的易揭膜热封强度减弱,且与PP杯体的热封强度明显减少,无法保证良好的密封性,对比例6制备的易揭膜力学强度减弱。
对比例7因中层内未添加茂金属线性低密度聚乙烯,而对比例8中使用线性低密度聚乙烯替代茂金属线性低密度聚乙烯,对比例7和对比例8制备的易揭膜的力学性能比实施例1小,但其热封性能改变不大。
对比例9为现有技术制备的一种耐蒸煮易揭膜,但其与PP杯体的热封强度较大,难以达到易揭的效果。
二、阻隔性检测:将实施例1、实施例9-11制备的易揭膜按照以下方法进行测试,将测试结果记录于表7中。
1、水蒸气透过率:按照GB/T1037-2021《塑料薄膜和和薄片水蒸气透过性能测定杯式增重与减重法》进行检测;
2、氧气透过率:按照GB/T19789-2021《包装材料塑料薄片和薄片氧气透过率试验库仑计检测法》进行检测。
表7实施例和实施例7-9制备的易揭膜阻隔性测试
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由表7内数据可以看出,实施例1中未在易揭膜的外层上进行后处理,易揭膜对于水蒸气和氧气的阻隔性有待提升;实施例9中对易揭膜外层使用含有石墨烯的环氧树脂乳液进行涂覆,并利用真空蒸发蒸镀PFDS,实施例7制备的易揭膜对水蒸气和氧气的阻隔性提升,能改善易揭膜对于食品类物质的长期储存能力;实施例10中仅对易揭膜外层上涂覆含有石墨烯的环氧树脂,其水蒸气透过率显著增大,氧气透过率也有所增加;实施例11中仅使用真空蒸镀PDFS,实施例11中对水蒸气的阻隔性减弱增大,而氧气的阻隔能力也减弱,说明易揭膜的后处理,能显著增强易揭膜的阻隔能力,提高其食品类包装物的储存稳定性。
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)
1.一种高温蒸煮封盖易揭膜,其特征在于,由外至内依次为外层、中间层和内层,所述内层包括以下重量份的原料:25-35份高密度聚乙烯、15-25份乙烯-丁烯共聚物、0.6-1份PPA助剂、25-35份线性低密度聚乙烯、1.5-2.5份爽滑剂、15-25份聚丙烯、2-2.8份开口剂;
所述中层包括以下重量份的原料:25-35份茂金属超低密度聚乙烯、25-35份高密度聚乙烯、15-25份线性低密度聚乙烯、15-25份茂金属线性低密度聚乙烯、0.6-1份PPA助剂;
所述外层包括以下重量份的原料:35-45份高密度聚乙烯、35-45份线性低密度聚乙烯、15-25份聚丙烯、0.6-1份PPA助剂。
2.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于:由外至内依次为外层、中间层和内层,所述内层包括以下重量份的原料:30-35份高密度聚乙烯、15-20份乙烯-丁烯共聚物、0.6-0.8份PPA助剂、25-30份线性低密度聚乙烯、1.5-2份爽滑剂、15-20份聚丙烯、2-2.4份开口剂;
所述中层包括以下重量份的原料:30-35份茂金属超低密度聚乙烯、30-35份高密度聚乙烯、20-25份线性低密度聚乙烯、20-25份茂金属线性低密度聚乙烯、0.8-1份PPA助剂;
所述外层包括以下重量份的原料:40-45份高密度聚乙烯、40-45份线性低密度聚乙烯、20-25份聚丙烯、0.8-1份PPA助剂。
3.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于,所述内层和外层中聚丙烯选自嵌段共聚PP、无规共聚PP、均聚PP中的一种。
4.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于,所述外层、中层和内层中的线性低密度聚乙烯的密度为0.90-0.94g/cm3,熔融指数为0.9-1.2g/10min。
5.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于,所述中层中茂金属线性低密度聚乙烯的密度为0.94-0.95g/cm3,熔融指数为0.9-1g/10min。
6.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于,所述内层和外层中高密度聚乙烯的密度为0.956-0.96g/cm3,熔融指数为1.0-1.2g/10min;
所述中层中高密度聚乙烯的密度为0.946-0.95g/cm3,熔融指数为6-6.5g/10min。
7.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于,所述中层内茂金属超低密度聚乙烯的密度为0.916-0.92g/cm3,熔融指数为0.5-1g/10min。
8.根据权利要求1所述的高温蒸煮封盖易揭膜,其特征在于,所述外层、内层和中层内均还添加有抗氧化剂,所述抗氧化剂的用量均为0.5-1重量份。
9.权利要求1-8任一项所述的高温蒸煮封盖易揭膜的制备方法,其特征在于,包括以下步骤:
将外层、中层和内层的原料分别混合均匀,经加热熔融、挤出、吹胀冷却、牵引定型、电晕处理、收卷。
10.根据权利要求9所述的高温蒸煮封盖易揭膜的制备方法,其特征在于,还包括以下后处理步骤:在所得高温蒸煮封盖易揭膜的外层涂刷含有石墨烯、环氧树脂、聚酰胺的混合乳液,干燥后将高温蒸煮封盖易揭膜涂覆混合乳液的一侧放置在PFDS的上方,在100-110℃、60-70kPa的条件下真空蒸发30-35min。
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