CN112480620A - 一种用于湿垃圾袋的降解树脂混合物及其制备方法 - Google Patents
一种用于湿垃圾袋的降解树脂混合物及其制备方法 Download PDFInfo
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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K3/24—Acids; Salts thereof
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- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
本发明提供一种用于湿垃圾袋的降解树脂混合物,包括按以下重量份的原料:PLA 49‑62份,淀粉38‑57份,PBAT 20‑35份,碳酸钙5‑13份,降解促进剂3‑12份,自动氧化剂3‑7份。使用本发明制备的湿垃圾袋降解速度控制在7‑15天,适应城市对湿垃圾的处理速度要求。
Description
技术领域
本发明属于可降解材料技术领域,具体涉及一种用于湿垃圾袋的降解树脂混合物及其制备方法。
背景技术
湿垃圾通常是指餐厨垃圾,湿垃圾由垃圾袋盛装后投放至社区垃圾桶,其处理方法可以是刺破湿垃圾袋后堆肥降解。由于湿垃圾气味刺鼻、污水易渗滤,恶劣的环境增加了湿垃圾袋的刺袋作业难度。部分企业已经生产出含PLA材质的可生物降解的湿垃圾袋,使湿垃圾袋在堆肥环境下自然降解,但是其降解周期仍然长达3个月以上,无法满足大中型城市对湿垃圾的快速处理需求。
发明内容
本发明的目的是提供一种用于湿垃圾袋的降解树脂混合物及其制备方法,以解决湿垃圾袋薄膜的降解速度慢的问题。
本发明提供了如下的技术方案:
一种用于湿垃圾袋的降解树脂混合物,包括按以下重量份的原料:PLA 49-62份,淀粉38-57份,PBAT 20-35份,碳酸钙5-13份,降解促进剂3-12份,自动氧化剂3-7份,
优选的,所述降解促进剂包括生物降解酶和/或热降解促进剂。
优选的,述热降解促进剂为硬脂酸盐。
优选的,所述自动氧化剂为油酸乙酯或者玉米油,所述自动氧化剂由淀粉包裹。
用于湿垃圾袋的降解树脂混合物的制备方法,包括以下步骤:
1)按重量份称取PLA、淀粉、PBAT、碳酸钙、降解促进剂和自动氧化剂,在烘箱中烘干去除水分;
2)将淀粉和自动氧化剂先后加入共混机中搅拌,使淀粉包裹自动氧化剂;
3)将PLA、PBAT、碳酸钙、降解促进剂加入共混机中,搅拌均匀;
4)将原料送入挤出机中熔融造粒。
本发明的有益效果是:
本发明在原料中添加生物降解塑料PBAT,其具有良好的延展性和断裂伸张率,可改善薄膜的吹膜效果和物理性能。原料中的碳酸钙可在堆肥条件中与湿垃圾中的污水以及PLA降解产生的二氧化碳和水反应生成易溶解的碳酸氢钙,实现了自动破袋,加速了湿垃圾袋薄膜的自降解速度。
淀粉是天然生物降解高分子化合物,降解速度快,且材料成本低。自动氧化剂可与土壤中金属盐反应,生成过氧化物,有利于微生物和酶的消化,促进可生物降解薄膜破碎并进一步使其降解为小分子化合物,加快降解速度。用淀粉包裹自动氧化剂,自动氧化剂能促进高分子的降解,当薄膜埋在土里时,淀粉首先被细菌分解成具有若干孔洞的网络状外壳;随后,藏在壳内的自动氧化剂与土壤中的盐和水发生化学反应生成氧化物,破坏塑胶分子化学键,进而达到加快降解的目的。
本降解树脂混合物降低了材料成本,改善了降解效果,在湿垃圾堆肥环境中降解时间可控制在7-15天,减轻了城市湿垃圾的处理压力。
具体实施方式
实施例1
本实施例提供一种用于湿垃圾袋的降解树脂混合物,包括按以下重量份的原料:PLA50份,淀粉57份,PBAT 35份,碳酸钙10份,降解促进剂5份,自动氧化剂7份,所述降解促进剂选用青岛生物芯生物降解聚合物有限公司生产的生物降解促进剂BPA,所述自动氧化剂为油酸乙酯,所述自动氧化剂由淀粉包裹。
实施例2
本实施例提供一种用于湿垃圾袋的降解树脂混合物,包括按以下重量份的原料:PLA61份,淀粉40份,PBAT 25份,碳酸钙13份,降解促进剂12份,自动氧化剂4份,所述降解促进剂选用铁、锌、锰的硬脂酸盐的热降解促进剂,所述自动氧化剂为油酸乙酯,所述自动氧化剂由淀粉包裹。
实施例3
本实施例提供一种用于湿垃圾袋的降解树脂混合物,包括按以下重量份的原料:PLA53份,淀粉40份,PBAT 35份,碳酸钙6份,降解促进剂8份,自动氧化剂5份,所述降解促进剂选用生物酶降解促进剂,所述自动氧化剂为玉米油,所述自动氧化剂由淀粉包裹。
将实施例1-3的降解树脂混合物按以下方法制备获得用于湿垃圾袋的可降解薄膜:
1)按重量份称取PLA、淀粉、PBAT、碳酸钙、降解促进剂和自动氧化剂,在85℃烘箱中烘干去除水分;
2)将淀粉和自动氧化剂先后加入共混机中搅拌10分钟,使淀粉包裹自动氧化剂;
3)将PLA、PBAT、碳酸钙、降解促进剂加入共混机中,搅拌均匀;
4)将原料送入双螺杆挤出机中熔融造粒;
5)将粒子送入塑料薄膜吹塑机中吹塑成膜。
对比例1
按重量份称取PLA 50份、淀粉45份、PBAT 33份,投入共混机内搅拌均匀后送入挤出机中熔融造粒,然后将粒子送入薄膜吹塑机中吹塑成膜。
模拟湿垃圾堆肥降解环境,将实施例1-3对应的薄膜以及对比例1分别装满餐厨垃圾后堆置于温度18-30℃、湿度30-50%的场地内,观察薄膜出现碎片化降解时间分别为9天、7天、12天以及30天以上。本发明的降解树脂混合物制备的湿垃圾袋可在7-15天内自动降解,既减轻了湿垃圾的处理压力,又不至于因降解时间过快而影响垃圾袋的强度及韧性等物理性能。
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 (5)
1.一种用于湿垃圾袋的降解树脂混合物,其特征在于,包括按以下重量份的原料:PLA49-62份,淀粉38-57份,PBAT 20-35份,碳酸钙5-13份,降解促进剂3-12份,自动氧化剂3-7份。
2.根据权利要求1所述的用于湿垃圾袋的降解树脂混合物,其特征在于,所述降解促进剂包括生物降解酶和/或热降解促进剂。
3.根据权利要求2所述的用于湿垃圾袋的降解树脂混合物,其特征在于,所述热降解促进剂为硬脂酸盐。
4.根据权利要求3所述的用于湿垃圾袋的降解树脂混合物,其特征在于,所述自动氧化剂为油酸乙酯或者玉米油,所述自动氧化剂由淀粉包裹。
5.一种权利要求1所述的用于湿垃圾袋的降解树脂混合物的制备方法,其特征在于,包括以下步骤:
1)按重量份称取PLA、淀粉、PBAT、碳酸钙、降解促进剂和自动氧化剂,在烘箱中烘干去除水分;
2)将淀粉和自动氧化剂先后加入共混机中搅拌,使淀粉包裹自动氧化剂;
3)将PLA、PBAT、碳酸钙、降解促进剂加入共混机中,搅拌均匀;
4)将原料送入挤出机中熔融造粒。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107022178A (zh) * | 2016-02-02 | 2017-08-08 | 黑龙江鑫达企业集团有限公司 | 一种可生物降解聚乳酸环保薄膜及其制备方法 |
CN107522933A (zh) * | 2017-09-25 | 2017-12-29 | 李顺华 | 一种垃圾分类用生物基全降解塑料垃圾袋及其制备方法 |
CN108003583A (zh) * | 2017-12-21 | 2018-05-08 | 苏州星火丰盈环保包装有限公司 | 一种高拉伸强度全生物降解垃圾袋生产工艺 |
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CN107022178A (zh) * | 2016-02-02 | 2017-08-08 | 黑龙江鑫达企业集团有限公司 | 一种可生物降解聚乳酸环保薄膜及其制备方法 |
CN107522933A (zh) * | 2017-09-25 | 2017-12-29 | 李顺华 | 一种垃圾分类用生物基全降解塑料垃圾袋及其制备方法 |
CN108003583A (zh) * | 2017-12-21 | 2018-05-08 | 苏州星火丰盈环保包装有限公司 | 一种高拉伸强度全生物降解垃圾袋生产工艺 |
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