CN115464963B - 一种bopbat薄膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种BOPBAT薄膜及其制备方法,BOPBAT薄膜从内而外依次包括热封层、芯层和电晕层;热封层包括下述质量百分比的原料:聚己二酸‑对苯二甲酸丁二醇酯A 98%‑99.5%、抗氧剂0.5%‑2%;芯层包括下述质量百分比的原料:聚己二酸‑对苯二甲酸丁二醇酯B 97.2%‑99.7%、扩链剂0.2%‑0.8%、抗氧剂0.1%‑2%;电晕层包括下述质量百分比的原料:聚己二酸‑对苯二甲酸丁二醇酯B 90%‑99.5%、淀粉0%‑5%、交联剂0.1%‑1%、增塑剂0.3%‑2%、爽滑剂0.1%‑2%。本发明的BOPBAT薄膜兼具优良的机械性能和热封性能。
Description
技术领域
本发明涉及双向拉伸薄膜材料技术领域,尤其涉及一种BOPBAT薄膜及其制备方法。
背景技术
聚己二酸-对苯二甲酸丁二醇酯(PBAT)是1,4-丁二醇(BDO)、对苯二甲酸(PTA)与己二酸(AA)的三元共聚物,是一可生物降解的热塑性聚酯树脂。PBAT综合了脂肪族聚酯的可降解性能和芳香族聚酯的高机械性能,适合制备加工成为薄膜制品,已经作为一种可降解薄膜原料被广泛应用于薄膜包装材料领域。
然而,由于PBAT材料不易进行双向拉伸,容易发生破膜,因此现有的PBAT薄膜主要由吹膜法制备,其与双向拉伸法制备的薄膜相比仍然存在拉伸强度低、抗穿刺强度低等问题,其附加价值低、应用场景有限。因此,开发一种双向拉伸聚己二酸-对苯二甲酸丁二醇酯(BOPBAT)薄膜,对PBAT薄膜材料应用领域的扩展以及性能的提升具有十分重要的意义。同时,对于薄膜包装材料来说,热封性能也是至关重要的一个参数,其直接影响到包装产品在储存、运输或使用过程中,是否容易发生封口破损、漏气等质量缺陷。
发明内容
基于背景技术存在的技术问题,本发明提出了一种兼具优良机械性能和热封性能的BOPBAT薄膜及其制备方法。
本发明提出的一种BOPBAT薄膜,从内而外依次包括热封层、芯层和电晕层;
所述热封层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯A98-99.5%、抗氧剂0.5%-2%;
所述芯层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B97.2%-99.7%、扩链剂0.2%-0.8%、抗氧剂0.1%-2%;
所述电晕层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B90%-99.5%、淀粉0%-5%、交联剂0.1%-1%、增塑剂0.3%-2%、爽滑剂0.1%-2%;
所述聚己二酸-对苯二甲酸丁二醇酯A的重均分子量为70000-120000g/mol,在2.16kg、190℃下的熔体流动速率为8-20g/10min,熔点为85-120℃;
所述聚己二酸-对苯二甲酸丁二醇酯B的重均分子量为120000-150000g/mol,在2.16kg、190℃下的熔体流动速率为2.5-4.5g/10min,熔点为115-135℃。
优选地,所述热封层、芯层和电晕层的厚度比为(1-2):(5-8):(1-3)。
优选地,所述薄膜的厚度为10-80μm。
优选地,所述扩链剂为巴斯夫ADR4468。
优选地,所述增塑剂为山梨醇、乙二醇、甘油中的至少一种。
优选地,所述爽滑剂为乙撑双硬酯酸酰胺、芥酸酰胺、硬脂酸锌中的至少一种。
优选地,所述抗氧剂为抗氧剂1010、抗氧剂168中的至少一种。
优选地,所述淀粉为玉米淀粉、红薯淀粉、小麦淀粉中的至少一种。
优选地,所述交联剂为双叔丁基过氧异丙基苯。
一种所述的BOPBAT薄膜的制备方法,包括下述步骤:
S1、分别将热封层的原料加入单螺杆挤出机中,将芯层和电晕层的原料加入两台双螺杆挤出机中进行挤出流延,冷却后得到复合铸片;
S2、将所述复合铸片先进行纵向拉伸,然后进行横向拉伸,经过热定型,得到BOPBAT薄膜。
优选地,所述热封层的原料的挤出流延温度为100-190℃,芯层的原料的挤出流延温度为120-200℃,电晕层的原料的挤出流延温度为120-190℃,冷却温度为20-50℃。
优选地,所述纵向拉伸的拉伸比为2-6倍,拉伸温度为50-115℃。
优选地,所述横向拉伸的拉伸比为5-10倍,拉伸温度为90-120℃。
优选地,所述热定型温度为110-125℃。
本发明的有益效果如下:
本发明通过设置具有三层结构的薄膜结构,并分别对热封层、芯层和电晕层的原料进行优选,使薄膜具有良好的双向拉伸性能;其中,芯层采用具有高重均分子量的聚己二酸-对苯二甲酸丁二醇酯树脂,且加入合适比例的扩链剂,使得经挤出流延后的铸片可以实现大倍率的双向拉伸而不发生破膜,此外,芯层材料的高熔点,还可以保证薄膜整体的耐热性;电晕层的配方可以解决薄膜收卷和分切时出现的粘连和褶皱问题,通过添加适量的改性淀粉可以降低薄膜的生产成本,可以根据需求调节改性淀粉的含量以调控薄膜的光学性能,提高分子量,满足在较大拉伸比时不破膜;热封层的配方通过采用分子量更低的树脂原料,可以保证薄膜的热封强度,并且由于低熔点的热封层原料与芯层、电晕层形成温度差,还能够防止热封时薄膜出现褶皱。综上,本发明的BOPBAT薄膜不仅具有高机械强度和热封强度,能够满足包装材料的使用性能需求,还具备高透光率(>90%)和低雾度(<5%),光学性能优良。
具体实施方式
下面,通过具体实施例对本发明的技术方案进行详细说明。
实施例1
一种BOPBAT薄膜,从内而外依次包括热封层、芯层和电晕层;
热封层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯A 98%、抗氧剂1010 2%;
芯层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B 97.2%、巴斯夫ADR4468扩链剂0.8%、抗氧剂1010 2%;
电晕层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B 90%、玉米淀粉5%、双叔丁基过氧异丙基苯1%、山梨醇2%、乙撑双硬酯酸酰胺2%;
聚己二酸-对苯二甲酸丁二醇酯A为蓝山屯河TH803S,重均分子量为70000-120000g/mol,在2.16kg、190℃下的熔体流动速率为10-16g/10min,熔点为113℃;
聚己二酸-对苯二甲酸丁二醇酯B为蓝山屯河TH801T,重均分子量为120000-150000g/mol,在2.16kg、190℃下的熔体流动速率为3.9g/10min,熔点为119℃。
薄膜的厚度为25μm,其中热封层、芯层和电晕层的厚度比为1.5:6.5:2。
BOPBAT薄膜的制备方法包括下述步骤:
S1、分别将热封层的原料加入单螺杆挤出机中在140℃下挤出流延,将芯层的原料加入一台双螺杆挤出机中在160℃下挤出流延,将电晕层的原料加入另一台双螺杆挤出机中在150℃下挤出流延,在30℃下冷却后得到复合铸片;
S2、将所述复合铸片先进行纵向拉伸,然后进行横向拉伸,经过热定型,得到BOPBAT薄膜;其中纵向拉伸的拉伸比为4倍,拉伸温度为110℃;横向拉伸的拉伸比为8倍,拉伸温度为115℃;热定型温度为122℃。
实施例2
一种BOPBAT薄膜,从内而外依次包括热封层、芯层和电晕层;
热封层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯A 99.5%、抗氧剂168 0.5%;
芯层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B 99.7%、巴斯夫ADR4468扩链剂0.2%、抗氧剂168 0.1%;
电晕层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B 99.5%、双叔丁基过氧异丙基苯0.1%、乙二醇0.3%、芥酸酰胺0.1%;
聚己二酸-对苯二甲酸丁二醇酯A为蓝山屯河TH803S,重均分子量为70000-120000g/mol,在2.16kg、190℃下的熔体流动速率为10-16g/10min,熔点为113℃;
聚己二酸-对苯二甲酸丁二醇酯B为蓝山屯河TH801T,重均分子量为120000-150000g/mol,在2.16kg、190℃下的熔体流动速率为3.9g/10min,熔点为119℃。
薄膜的厚度为25μm,其中热封层、芯层和电晕层的厚度比为1.5:6.5:2。
BOPBAT薄膜的制备方法同实施例1。
实施例3
一种BOPBAT薄膜,从内而外依次包括热封层、芯层和电晕层;
热封层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯A 99%、抗氧剂1010 1%;
芯层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B 98.5%、巴斯夫ADR4468扩链剂0.5%、抗氧剂1010 1%;
电晕层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B 95%、玉米淀粉3%、双叔丁基过氧异丙基苯0.5%、甘油1%、硬脂酸锌0.5%;
聚己二酸-对苯二甲酸丁二醇酯A为蓝山屯河TH803S,重均分子量为70000-120000g/mol,在2.16kg、190℃下的熔体流动速率为10-16g/10min,熔点为113℃;
聚己二酸-对苯二甲酸丁二醇酯B为蓝山屯河TH801T,重均分子量为120000-150000g/mol,在2.16kg、190℃下的熔体流动速率为3.9g/10min,熔点为119℃。
薄膜的厚度为25μm,其中热封层、芯层和电晕层的厚度比为1.5:6.5:2。
BOPBAT薄膜的制备方法同实施例1。
试验例
对上述实施例1-3制得的BOPBAT薄膜进行性能测试,其中,拉伸强度参照GB/T1040.3,雾度和透光率参照GB/T 2410,热封强度参照GB/T 10003-2008;测试结果如表1所示:
表1
由此可见,本发明的BOPBAT薄膜不仅具有高机械强度和热封强度,还具备优良的光学性能。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (10)
1.一种BOPBAT薄膜,其特征在于,从内而外依次包括热封层、芯层和电晕层;
所述热封层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯A98%-99.5%、抗氧剂0.5%-2%;
所述芯层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B97.2%-99.7%、扩链剂0.2%-0.8%、抗氧剂0.1%-2%;
所述电晕层包括下述质量百分比的原料:聚己二酸-对苯二甲酸丁二醇酯B90%-99.5%、淀粉0%-5%、交联剂0.1%-1%、增塑剂0.3%-2%、爽滑剂0.1%-2%;
所述聚己二酸-对苯二甲酸丁二醇酯A的重均分子量为70000-120000g/mol,在2.16kg、190℃下的熔体流动速率为8-20g/10min,熔点为85-120℃;
所述聚己二酸-对苯二甲酸丁二醇酯B的重均分子量为120000-150000g/mol,在2.16kg、190℃下的熔体流动速率为2.5-4.5g/10min,熔点为115-135℃。
2.根据权利要求1所述的BOPBAT薄膜,其特征在于,所述热封层、芯层和电晕层的厚度比为(1-2):(5-8):(1-3);
所述薄膜的厚度为10-80μm。
3.根据权利要求1所述的BOPBAT薄膜,其特征在于,所述扩链剂为巴斯夫ADR4468。
4.根据权利要求1所述的BOPBAT薄膜,其特征在于,所述增塑剂为山梨醇、乙二醇、甘油中的至少一种。
5.根据权利要求1所述的BOPBAT薄膜,其特征在于,所述爽滑剂为乙撑双硬酯酸酰胺、芥酸酰胺、硬脂酸锌中的至少一种。
6.根据权利要求1所述的BOPBAT薄膜,其特征在于,所述淀粉为玉米淀粉、红薯淀粉、小麦淀粉中的至少一种。
7.根据权利要求1所述的BOPBAT薄膜,其特征在于,所述交联剂为双叔丁基过氧异丙基苯。
8.一种如权利要求1-7任一项所述的BOPBAT薄膜的制备方法,其特征在于,包括下述步骤:
S1、分别将热封层的原料加入单螺杆挤出机中,将芯层和电晕层的原料加入两台双螺杆挤出机中进行挤出流延,冷却后得到复合铸片;
S2、将所述复合铸片先进行纵向拉伸,然后进行横向拉伸,经过热定型,得到BOPBAT薄膜。
9.根据权利要求8所述的BOPBAT薄膜的制备方法,其特征在于,所述热封层的原料的挤出流延温度为100-190℃,芯层的原料的挤出流延温度为120-200℃,电晕层的原料的挤出流延温度为120-190℃,冷却温度为20-50℃。
10.根据权利要求8所述的BOPBAT薄膜的制备方法,其特征在于,所述纵向拉伸的拉伸比为2-6倍,拉伸温度为50-115℃;
所述横向拉伸的拉伸比为5-10倍,拉伸温度为90-120℃;
所述热定型温度为110-125℃。
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