CN111454472A - 一种高透明自粘pbat保鲜膜的制备方法 - Google Patents

一种高透明自粘pbat保鲜膜的制备方法 Download PDF

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CN111454472A
CN111454472A CN202010267429.2A CN202010267429A CN111454472A CN 111454472 A CN111454472 A CN 111454472A CN 202010267429 A CN202010267429 A CN 202010267429A CN 111454472 A CN111454472 A CN 111454472A
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pbat
preservative film
transparency
adhesive
film
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洪若静
韩路坤
唐成文
鲁帆
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Anhui Jumei Biotechnology Co ltd
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Anhui Jumei Biotechnology Co ltd
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Priority to US16/897,294 priority patent/US11739186B2/en
Priority to EP20180963.9A priority patent/EP3892431A1/en
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Abstract

本发明公开了一种高透明自粘PBAT保鲜膜的制备方法，原料包括PBAT、ACR、甘油和甘油脂肪酸酯；制备方法包括混料、制作料粒、吹膜、卷膜。本发明通过在PBAT树脂中加入ACR，增加了PBAT保鲜膜的延展性、回缩性和收卷平整性；甘油可以提高PBAT保鲜膜的挤出稳定性、柔软性和粘附性；甘油脂肪酸酯，能够提高PBAT保鲜膜的防雾性；同时甘油和甘油脂肪酸可以起到协同作用，进一步增强PBAT保鲜膜的防雾效果。本发明制得的PBAT保鲜膜物理性能优越、透明度高、黏附度高、回缩性高、收卷平整无褶皱、透气性好。

Description

一种高透明自粘PBAT保鲜膜的制备方法
技术领域
本发明涉及高分子技术领域，具体是一种高透明自粘PBAT保鲜膜的制备方法。
背景技术
目前市场上的保鲜膜多是不能生物降解的PE、PVC类保鲜膜，PVC保鲜膜含有增塑剂己二酸二辛酯(DEHA)。世界自然基金会将该物质列为可能会损害人体内分泌***的物质，欧洲一些国家和日本、韩国已禁止使用PVC保鲜膜，我国也开始禁止使用PVC保鲜膜。PE保鲜膜柔软性差、回缩性差、粘附性差，而且PE、PVC类保鲜膜废弃后会产生白色污染，严重破坏生态环境。
PBAT是一种热塑性生物降解塑料，是己二酸丁二醇酯和对苯二甲酸丁二醇酯的共聚物。PBAT具有有较好的延展性、断裂伸长率、耐热性和冲击性能，但是其透气性差、粘附性差、收卷时难以平整。这些缺点限制了其在蔬菜、水果、食品保鲜膜上的应用。
发明内容
本发明旨在提供一种高透明自粘PBAT保鲜膜的制备方法，解决上述难题，改善由于使用保鲜膜而造成的白色污染问题。
为实现上述目的，本发明提供以下的技术方案：一种高透明自粘PBAT保鲜膜的制备方法，包括以下步骤：
S1、将PBAT、ACR、甘油、甘油脂肪酸酯按比例加入混料机中混料，得到混合均匀的物料；
S2、将所得混合均匀的物料在挤出机中挤出、拉条、冷却、切粒，得到制作保鲜膜的料粒；
S3、将所得料粒加入吹膜机组中挤出、吹胀、牵引、冷却、收卷，得到高透明自粘PBAT保鲜膜；
S4、对S3中所得保鲜膜进行复卷，制得小卷高透明自粘PBAT保鲜膜；
S1中所述各组分的用量以重量计为：PBAT 88-94.5％，ACR 3-8％，甘油0.5-1％，甘油脂肪酸酯1-3％；所述PBAT为己二酸丁二醇酯和对苯二甲酸丁二醇酯的共聚物，所述ACR为丙烯酸酯的高分子共聚物，所述ACR的分子量为500-10000。
作为改进，S2中所述挤出机选用双螺杆挤出机。
作为改进，所述双螺杆挤出机螺杆的长径比为52：1。
作为改进，S2中所述双螺杆挤出机的料筒温度为140-155℃，模头温度为155-170℃。
作为改进，S3中所述吹膜机料筒温度为150-165℃，模头温度为165-180℃，吹胀比为3。
作为改进，所述混料机为高速混料机，所述高速混料机的转速为200r/min。
作为改进，S4中所述复卷步骤在保鲜膜复卷机上进行，所述保鲜膜复卷机的速度为100-150m/min。
本发明的有益效果在于：
本发明选用特殊分子量的ACR对PBAT进行改性，增加了PBAT的延展性、回缩性和收卷平整性，使收卷得到的PBAT膜平整、无褶皱；甘油可以提高PBAT保鲜膜的挤出稳定性、柔软性和粘附性，使挤出的PBAT膜厚度均匀，更易于制得平整的保鲜膜；甘油脂肪酸酯可以提高PBAT保鲜膜的防雾性，提高保鲜膜的透明度。本发明公开的制作方法可以简化PBAT保鲜膜的生产工艺，加速PBAT保鲜膜的成型，提高生产效率、降低生产成本；生产出的PBAT保鲜膜可以替代市场上PE、PVC保鲜膜，减小环境污染。
具体实施方式
下面通过实施例的方式进一步说明本发明，但并不因此将本发明限制在所述的实施例范围中。
实施例1
本实施例公开了一种高透明自粘PBAT保鲜膜的制备方法,包括如下步骤：
S1.以重量份数计，将95.5份PBAT、3份ACR加入高速混料机内，以200r/min搅拌，然后缓慢加入0.5份的甘油在200r/min的转速下搅拌两分钟，再加入2份甘油脂肪酸酯，在200r/min的转速下搅拌3min，得到混合均匀的物料。
S2.将混合好的物料放入长径比52:1的双螺杆挤出机内，经挤出、拉条、冷却、切粒后得到制作保鲜膜的料粒；双螺杆挤出机料筒温度为150℃，模头温度为160℃。
S3.将所得料粒放入吹膜机中，经挤出、吹胀、牵引、冷却、收卷得到高透明自粘PBAT保鲜膜，吹膜机料筒温度160℃，模头温度170℃，吹胀比为3。
S4.将高透明自粘PBAT保鲜膜在复卷机上以120m/min的速度进行复卷，制得小卷保鲜膜。
S3和S4步骤制得的保鲜膜均平整无褶皱、透明度高、防雾性能好。
实施例2
本实施例公开了一种高透明自粘PBAT保鲜膜的制备方法,包括如下步骤：
S1.以重量份数计，将92.2份PBAT、5份ACR加入高速混料机内，以200r/min搅拌，然后缓慢加入0.8份的甘油，在200r/min的转速下搅拌2min，再加入2份甘油脂肪酸酯，在200r/min的转速下搅拌3min，得到混合均匀的物料。
S2.将混合好的物料放入长径比52:1的双螺杆挤出机内，经挤出、拉条、冷却、切粒后得到制作保鲜膜的料粒；双螺杆挤出机料筒温度为140℃，模头温度为155℃。
S3.将所得料粒放入吹膜机中，经挤出、吹胀、牵引、冷却、收卷得到高透明自粘PBAT保鲜膜，吹膜机料筒温度150℃，模头温度165℃，吹胀比为3。
S4.将高透明自粘PBAT保鲜膜在复卷机上以150m/min的速度进行复卷，制得小卷保鲜膜。
实施例3
本实施例公开了一种高透明自粘PBAT保鲜膜的制备方法,包括如下步骤：
S1.以重量份数计，将88份PBAT、8份ACR加入高速混料机内，以200r/min搅拌，然后缓慢加入1份的甘油，在200r/min的转速下搅拌2min，再加入3份甘油脂肪酸酯，在200r/min的转速下搅拌3min，得到混合均匀的物料。
S2.将混合好的物料放入长径比52:1的双螺杆挤出机内，经挤出、拉条、冷却、切粒后得到制作保鲜膜的料粒；双螺杆挤出机料筒温度为155℃，模头温度为170℃。
S3.将所得料粒放入吹膜机中，经挤出、吹胀、牵引、冷却、收卷得到高透明自粘PBAT保鲜膜，吹膜机料筒温度165℃，模头温度180℃，吹胀比为3。
S4.将高透明自粘PBAT保鲜膜在复卷机上以100m/min的速度进行复卷，制得小卷保鲜膜。
实施例8
本实施例公开了实施例1-3所得高透明自粘PBAT保鲜膜的性能数据。
对照组1：
S1.以重量份数计，将95.5份PBAT、3份ACR加入高速混料机内，以200r/min搅拌，然后缓慢加入2份甘油脂肪酸酯，在200r/min的转速下搅拌3min，得到混合均匀的物料。
S2.将混合好的物料放入长径比52:1的双螺杆挤出机内，经挤出、拉条、冷却、切粒后得到制作保鲜膜的料粒；双螺杆挤出机料筒温度为150℃，模头温度为160℃。
S3.将所得料粒放入吹膜机中，经挤出、吹胀、牵引、冷却、收卷得到高透明自粘PBAT保鲜膜，吹膜机料筒温度160℃，模头温度170℃，吹胀比为3。
S4.将高透明自粘PBAT保鲜膜在复卷机上以100m/min的速度进行复卷，制得小卷保鲜膜。
对照组2：
S1.以重量份数计，将95.5份PBAT、3份ACR加入高速混料机内，以200r/min搅拌，然后缓慢加入0.5份甘油，在200r/min的转速下搅拌3min，得到混合均匀的物料。
S2.将混合好的物料放入长径比52:1的双螺杆挤出机内，经挤出、拉条、冷却、切粒后得到制作保鲜膜的料粒；双螺杆挤出机料筒温度为150℃，模头温度为160℃。
S3.将所得料粒放入吹膜机中，经挤出、吹胀、牵引、冷却、收卷得到高透明自粘PBAT保鲜膜，吹膜机料筒温度160℃，模头温度170℃，吹胀比为3。
S4.将高透明自粘PBAT保鲜膜在复卷机上以120m/min的速度进行复卷，制得小卷保鲜膜。
试验方法：
1.防雾性测试
低温防雾性：在250ml的烧杯中加入200ml的水，蒙上高透明自粘PBAT保鲜膜，放到3-5℃的冰箱中3h，观察保鲜膜表面水珠附着状态。
高温防雾性：在250ml的烧杯中加入50ml的水，蒙上高透明自粘PBAT保鲜膜，放到60℃的水浴里恒温40min，观察保鲜膜表面水珠附着状态。
判断标准
防雾性优：薄膜表面清晰、透明、无水珠附着；
防雾性良：薄膜表面局部有透明或半透明的水雾；
防雾性差：薄膜表面有大面积的小水珠或密密麻麻的大水珠。
2.粘附性测试
保鲜膜浅盘包装好，放到3-5℃的冰箱中8h，观察浅盘底面保鲜膜是否松散。
粘附性优：浅盘底面保鲜膜不松散；粘附性差：浅盘底面保鲜膜松散。
3.回缩性测试
保鲜膜浅盘包装好，放到3-5℃的冰箱中8h，观察浅盘底面保鲜膜绷紧状态。
回缩性优：保鲜膜表面绷紧、平滑；回缩性差：保鲜膜表面未绷紧、有少量波纹。
4.力学性能测试
利用GB/T 1040.2-2006检测保鲜膜的拉伸强度和断裂伸长率；
利用GB/T 16578.1-2008检测保鲜膜的撕裂强度。
5.氧气透过率和透湿率采用相关仪器进行检测。
检测结果如下表所示：
表1高透明自粘PBAT保鲜膜检测数据
Figure BDA0002441820380000041
表2高透明自粘PBAT保鲜膜力学性能检测数据
Figure BDA0002441820380000051
基于上述检测结果，采用本发明方案制作出的高透明PBAT保鲜膜具有较好防雾性、粘附性和回缩性，透气性和透湿率也有明显改善；力学性能方面，拉伸强度稍有下降，但撕裂强度和断裂伸长率均由显著提升。
本发明通过在PBAT树脂中加入ACR，增加了PBAT保鲜膜的延展性、回缩性和收卷平整性；甘油可以提高PBAT保鲜膜的挤出稳定性、柔软性和粘附性；甘油脂肪酸酯，能够提高PBAT保鲜膜的防雾性；同时甘油和甘油脂肪酸可以起到协同作用，进一步增强PBAT保鲜膜的防雾效果。本发明制得的PBAT保鲜膜物理性能优越、透明度高、黏附度高、回缩性高、收卷平整无褶皱、透气性好。
以上对本发明的具体实施例进行了详细描述，但其只是作为范例，对于本领域技术人员而言，任何对本发明进行的等同修改和替代也都在本发明的范畴之中。因此，不脱离本发明的精神和范围下所做的均等变换和修改，都应涵盖在本发明的范围内。

Claims (7)

1.一种高透明自粘PBAT保鲜膜的制备方法，其特征在于，包括以下步骤：
S1、将PBAT、ACR、甘油、甘油脂肪酸酯按比例加入混料机中混料，得到混合均匀的物料；
S2、将所得混合均匀的物料在挤出机中挤出、拉条、冷却、切粒，得到制作保鲜膜的料粒；
S3、将所得料粒加入吹膜机组中挤出、吹胀、牵引、冷却、收卷，得到高透明自粘PBAT保鲜膜；
S4、对S3中所得保鲜膜进行复卷，制得小卷高透明自粘PBAT保鲜膜；
S1中所述各组分的用量以重量计为：PBAT 88-94.5％，ACR 3-8％，甘油0.5-1％，甘油脂肪酸酯1-3％；所述PBAT为己二酸丁二醇酯和对苯二甲酸丁二醇酯的共聚物，所述ACR为丙烯酸酯的高分子共聚物,所述ACR的分子量为500-10000。
2.根据权利要求1所述的一种高透明自粘PBAT保鲜膜的制备方法，其特征在于，S2中所述挤出机选用双螺杆挤出机。
3.根据权利要求2所述的一种高透明自粘PBAT保鲜膜的制备方法，其特征在于，所述双螺杆挤出机螺杆的长径比为52：1。
4.根据权利要求1所述的一种高透明自粘PBAT保鲜膜的制备方法，其特征在于，S2中所述双螺杆挤出机的料筒温度为140-155℃，模头温度为155-170℃。
5.根据权利要求1所述的一种高透明PBAT保鲜膜的制备方法，其特征在于，S3中所述吹膜机料筒温度为150-165℃，模头温度为165-180℃，吹胀比为3。
6.根据权利要求1所述的一种高透明PBAT保鲜膜的制备方法，其特征在于，所述混料机为高速混料机，所述高速混料机的转速为200r/min。
7.根据权利要求1所述的一种高透明PBAT保鲜膜的制备方法，其特征在于，S4中所述复卷步骤在保鲜膜复卷机上进行，所述保鲜膜复卷机的速度为100-150m/min。
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