CN113561590A - 一种厌氧发酵共挤降解袋及制备方法 - Google Patents
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Abstract
本发明公开了一种厌氧发酵共挤降解袋及制备方法,所述降解袋包括外层、中层和内层,其中外层和内层均由聚己二酸对苯二丁酯(PBAT)、聚乳酸(PLA)、热塑性淀粉树脂三种原料混合制备,中层由改性PVA原料制成,所述外层和内层原料中各组分的质量份数分别为:聚己二酸对苯二甲酸丁二酯50‑60份,聚乳酸20‑30份,热塑性淀粉树脂10‑30份。本发明内外层在光、热、微生物等环境下发生分解,当外层破损时,中层若遇水分子,则会被水溶解,加速降解速率,可在一周内进行发酵降解并产生沼气,对自然及对微生物友好。该方法利用自然界的水作为降解的载体,降解门槛更低,速度更快,环保节省,同时本发明的降解袋具有良好的韧性、热封性。
Description
技术领域
本发明涉塑料袋技术领域,尤其涉及一种厌氧发酵共挤降解袋及制备方法。
背景技术
塑料袋广泛应用于超市和市场中,给人们生活带来了便利,但塑料袋废弃后作为垃圾埋于地下,塑料袋的自然降解时间需要百年时间才能完成降解。现有的塑料袋降解速度很慢,在自然环境中长期不能降解。
发明内容
为了实现上述目的,本发明采用了如下技术方案:1.一种厌氧发酵共挤降解袋,其特征在于:包括外层、中层和内层,其中外层和内层均由聚己二酸对苯二丁酯(PBAT)、聚乳酸(PLA)、热塑性淀粉树脂三种原料混合制备,中层由水溶性改性PVA原料制成。
优选地,所述外层和内层原料中各组分的质量份数分别为:聚己二酸对苯二甲酸丁二酯50-60份,聚乳酸20-30份,热塑性淀粉树脂 10-30份。
优选地,所述降解袋总厚度为0.02-0.04mm,其中外层、中层和内层的厚度比为1:8:1。
本发明还提供了一种厌氧发酵可降解袋的制备方法,包括以下步骤:
S1.将若干份改性PVA置于50℃-70℃的鼓风干燥箱中干燥4h-6h;
S2.将聚乙二醇对苯二甲酸丁二酯、聚乳酸和热塑性淀粉树脂按比例加入高速搅拌机中常温搅拌,混合均匀后出料;
S3.将混合料加入双螺杆挤出机中,在140℃-180℃下挤出造粒;
S4.将干燥后的改性PVA加入三层共挤吹膜机的中层挤出机漏斗,将混合料分别加入三层共挤吹膜机的外层和内层挤出机漏斗,同时挤出,通过模头,吹塑成厚度为0.03mm的薄膜,收卷后薄膜经加工后得到成品厌氧发酵可降解袋。
优选地,步骤S4中外层的挤出温度为110℃-130℃,能使挤出的薄膜产生有更好的韧性、热封性。
优选地,步骤S4中中层的挤出温度为125℃-160℃,能使挤出的薄膜产生有更好的韧性、热封性。
优选地,步骤S4中中层的挤出温度为110℃-130℃,能使挤出的薄膜产生有更好的韧性、热封性。
优选地,步骤S4中薄膜总挤出速度控制在16-17米/分进行定型冷却。
本发明具有如下有益效果:
本发明是一种具有生物降解性和水溶性的生态友好材料,在自然环境中,微生物最终会将产品分解成二氧化碳和水;回归自然环境后,具有改良土壤的效果。内外层在光、热、微生物等环境下发生分解,当外层破损时,中层若遇水分子,则会被水溶解,加速降解速率,可在一周内进行发酵降解并产生沼气,对自然及对微生物友好。该方法利用自然界的水作为降解的载体,降解门槛更低,速度更快,环保节省,同时本发明的降解袋具有良好的韧性、热封性。
附图说明
图1为本发明提供的厌氧发酵共挤降解袋的降解性能实验数据表;
图2为本发明提供的厌氧发酵共挤降解袋的韧性及热封性实验数据表。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实例一:
先将质量份数分别为:100份聚己二酸对苯二甲酸丁二酯,40份聚乳酸,60份热塑性淀粉树脂加入高速搅拌机中常温搅拌20min,混合均匀后出料,将混合料加入双螺杆挤出机中,在140℃-180℃下挤出造粒。再将100份改性PVA置于60℃的鼓风干燥箱中干燥5h。然后将干燥后的改性PVA加入三层共挤吹膜机的中层挤出机漏斗,将混合料分别加入三层共挤吹膜机的外层和内层挤出机漏斗,同时挤出,其中外层挤出温度为110℃-130℃,中层为水溶性降解料原料,挤出温度为125℃-160℃,内层挤出温度为110℃-130℃,以16-17米/分挤出速度,通过模头,吹塑成厚度为0.03mm的薄膜,其中外层、中层和内层的厚度比为1:8:1,收卷后薄膜经加工后得到成品厌氧发酵可降解袋。
实例二:
先将质量份数分别为:110份聚己二酸对苯二甲酸丁二酯,50份聚乳酸,40份热塑性淀粉树脂加入高速搅拌机中常温搅拌20min,混合均匀后出料,将混合料加入双螺杆挤出机中,在140℃-180℃下挤出造粒。再将100份改性PVA置于60℃的鼓风干燥箱中干燥5h。然后将干燥后的改性PVA加入三层共挤吹膜机的中层挤出机漏斗,将混合料分别加入三层共挤吹膜机的外层和内层挤出机漏斗,同时挤出,其中外层挤出温度为110℃-130℃,中层为水溶性降解料原料,挤出温度为125℃-160℃,内层挤出温度为110℃-130℃,以16-17米/分挤出速度,通过模头,吹塑成厚度为0.03mm的薄膜,其中外层、中层和内层的厚度比为1:8:1,收卷后薄膜经加工后得到成品厌氧发酵可降解袋。
实例三:
先将质量份数分别为:120份聚己二酸对苯二甲酸丁二酯,60份聚乳酸,20份热塑性淀粉树脂加入高速搅拌机中常温搅拌20min,混合均匀后出料,将混合料加入双螺杆挤出机中,在140℃-180℃下挤出造粒。再将100份改性PVA置于60℃的鼓风干燥箱中干燥5h。然后将干燥后的改性PVA加入三层共挤吹膜机的中层挤出机漏斗,将混合料分别加入三层共挤吹膜机的外层和内层挤出机漏斗,同时挤出,其中外层挤出温度为110℃-130℃,中层为水溶性降解料原料,挤出温度为125℃-160℃,内层挤出温度为110℃-130℃,以16-17米/分挤出速度,通过模头,吹塑成厚度为0.03mm的薄膜,其中外层、中层和内层的厚度比为1:8:1,收卷后薄膜经加工后得到成品厌氧发酵可降解袋。
通过对实施例一、二、三的性能测试可以发现,本发明制备的降 解袋不仅降解性能较好,12周降解率在96%以上,其中实施例三的 12周降解率达到100%,,并不会造成环境污染,如图1,同时该降解 袋具有良好的韧性、热封性,如图2。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (8)
1.一种厌氧发酵共挤降解袋,其特征在于:所述降解袋包括外层、中层和内层,其中外层和内层均由聚己二酸对苯二丁酯(PBAT)、聚乳酸(PLA)、热塑性淀粉树脂三种原料混合制备,中层由改性PVA原料制成。
2.根据权利要求1所述的一种厌氧发酵共挤降解袋,其特征在于:所述外层和内层原料中各组分的质量份数分别为:聚己二酸对苯二甲酸丁二酯50-60份,聚乳酸20-30份,热塑性淀粉树脂10-30份。
3.根据权利要求1所述的一种厌氧发酵共挤降解袋,其特征在于:所述降解袋总厚度为0.02-0.04mm,其中外层、中层和内层的厚度比为1:8:1。
4.一种厌氧发酵可降解袋的制备方法,包括以下步骤:
S1.将若干份改性PVA置于50℃-70℃的鼓风干燥箱中干燥4h-6h;
S2.将聚乙二醇对苯二甲酸丁二酯、聚乳酸和热塑性淀粉树脂按比例加入高速搅拌机中常温搅拌,混合均匀后出料;
S3.将混合料加入双螺杆挤出机中,在140℃-180℃下挤出造粒;
S4.将干燥后的改性PVA加入三层共挤吹膜机的中层挤出机漏斗中,将混合料分别加入三层共挤吹膜机的外层和内层挤出机漏斗中,同时挤出,通过模头,吹塑成厚度为0.02-0.04mm的薄膜,收卷后薄膜经过加工后得到成品厌氧发酵可降解袋。
5.根据权利要求4所述的一种厌氧发酵共挤降解袋的制备方法,其特征在于:步骤S4中外层的挤出温度为110℃-130℃。
6.根据权利要求4所述的一种厌氧发酵共挤降解袋的制备方法,其特征在于:步骤S4中中层的挤出温度为125℃-160℃。
7.根据权利要求4所述的一种厌氧发酵共挤降解袋的制备方法,其特征在于:步骤S4中中层的挤出温度为110℃-130℃。
8.根据权利要求4所述的一种厌氧发酵共挤降解袋的制备方法,其特征在于:步骤S4中薄膜总挤出速度控制在16-17米/分进行定型冷却。
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