CN115418088A - 一种增韧改性pla片材及其制备方法 - Google Patents
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Abstract
本发明公开了一种增韧改性PLA片材及其制备方法,PLA片材按重量份数包括PLA树脂80‑100份、填充矿粉20‑25份、植物纤维10‑20份、增韧剂2‑5份、偶联剂1‑5份、扩链剂1‑5份、扩链促进剂0.5‑2份、抗氧剂1‑3份和润滑剂1‑2份。本发明通过添加增韧剂直接用于提高PLA片材的韧性,并通过加入扩链剂保证PLA片材强度,同时通过扩链产生的空间结构的改变起到了一定的增韧作用。
Description
技术领域
本发明涉及PLA材料加工技术领域,尤其涉及一种增韧改性PLA片材及其制备方法。
背景技术
聚乳酸PLA是目前应用最广泛的环保材料之一,具有良好的生物相容性和生物降解性,可以在微生物和酶的作用下完全降解成水和二氧化碳,广泛应用于包装、医用和3D打印等多个领域。
但聚乳酸PLA材料也存在结晶度较小、分子链中酯键键能小、容易断裂等缺陷,因此造成聚乳酸的热变形温度低、冲击强度低、韧性不好等缺陷,其相较于其他高分子材料的较为明显的缺陷影响其使用性能。
发明内容
本发明的目的在于提供一种增韧改性PLA片材及其制备方法,通过添加增韧剂直接用于提高PLA片材的韧性,而且通过加入扩链剂保证PLA片材强度,同时通过扩链产生的空间结构的改变起到了一定的增韧作用。
为达到上述目的,本发明采用的技术方案是:一种增韧改性PLA片材,按重量份数包括如下组分,PLA树脂80-100份、填充矿粉20-25份、植物纤维10-20份、增韧剂2-5份、偶联剂1-5份、扩链剂1-5份、扩链促进剂0.5-2份、抗氧剂1-3份和润滑剂1-2份。
作为进一步的优化,所述PLA树脂的结晶度为20-60%;所述植物纤维为500-1000目。
作为进一步的优化,所述填充矿粉为碳酸钙、硅藻土和滑石粉中的一种或多种。
作为进一步的优化,所述增韧剂为丙烯酸酯类聚合物、醋酸乙烯共聚物和乙烯共聚物中的一种或多种。
作为进一步的优化,所述偶联剂为甲基丙烯酸缩水甘油酯、二苯亚甲基二异氰酸酯或硅烷偶联剂中的一种或多种。
作为进一步的优化,所述扩链主剂扩链剂KL-E 4370或扩链剂Basf 4730。
作为进一步的优化,所述扩链促进剂为硬脂酸锌。
作为进一步的优化,所述抗氧剂为抗氧剂1060、抗氧剂1076或抗氧剂168中的一种或多种。
作为进一步的优化,所述润滑剂为乙撑双硬脂酰胺或单硬脂酸甘油酯。
本发明还提供了一种增韧改性PLA片材的制备方法,包括如下步骤,
S1)准确称取各原料;
S2)将PLA树脂、增韧剂、偶联剂、扩链剂和扩链促进剂加入到高速搅拌机中,混合10-20min,得到混合物料A;
S3)将填充矿粉、植物纤维、抗氧剂和润滑剂加入到高速搅拌机中混合5-10min,得到混合物料B;
S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
与已有技术相比,本发明的有益效果体现在:
1.本发明通过添加增韧剂直接用于提高PLA片材的韧性,而且通过加入扩链剂保证PLA片材强度,同时通过扩链产生的空间结构的改变起到了一定的增韧作用;
2.本发明通过加入植物纤维,一方面提高了PLA片材的可降解性和环保性,同时在具有较小密度的前提下,可以提高模量与拉伸强度,改善了PLA片材的韧性。
具体实施方式
以下是本发明的具体实施例,对本发明的技术方案作进一步的描述,但本发明并不限于这些实施例。
实施例1
一种增韧改性PLA片材,按重量份数包括如下组分,PLA树脂95份(30%结晶度)、碳酸钙20份、植物纤维18份、醋酸乙烯共聚物3份、硅烷偶联剂4份、扩链剂KL-E 4370 3份、硬脂酸锌1份、抗氧剂1060 2份和乙撑双硬脂酰胺1份。
其制备方法为:S1)准确称取各原料;S2)将PLA树脂、醋酸乙烯共聚物、硅烷偶联剂、扩链剂KL-E 4370和硬脂酸锌加入到高速搅拌机中,混合15min,得到混合物料A;S3)将碳酸钙、植物纤维、抗氧剂1060和乙撑双硬脂酰胺加入到高速搅拌机中混合10min,得到混合物料B;S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
实施例2
一种增韧改性PLA片材,按重量份数包括如下组分,PLA树脂83份(20%结晶度)、碳酸钙25份、植物纤维15份、醋酸乙烯共聚物5份、硅烷偶联剂2份、扩链剂Basf 4730 3份、硬脂酸锌1份、抗氧剂1076 1份和单硬脂酸甘油酯2份。
其制备方法为:S1)准确称取各原料;S2)将PLA树脂、醋酸乙烯共聚物、硅烷偶联剂、扩链剂Basf 4730和硬脂酸锌加入到高速搅拌机中,混合10min,得到混合物料A;S3)将碳酸钙、植物纤维、抗氧剂1076和单硬脂酸甘油酯加入到高速搅拌机中混合10min,得到混合物料B;S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
实施例3
一种增韧改性PLA片材,按重量份数包括如下组分,PLA树脂92份(30%结晶度)、硅藻土22份、植物纤维20份、丙烯酸酯类聚合物4份、硅烷偶联剂1份、扩链剂Basf 4730 5份、硬脂酸锌0.5份、抗氧剂168 2份和乙撑双硬脂酰胺2份。
其制备方法为:S1)准确称取各原料;S2)将PLA树脂、丙烯酸酯类聚合物、硅烷偶联剂、扩链剂Basf 4730和硬脂酸锌加入到高速搅拌机中,混合20min,得到混合物料A;S3)将硅藻土、植物纤维、抗氧剂168和乙撑双硬脂酰胺加入到高速搅拌机中混合10min,得到混合物料B;S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
实施例4
一种增韧改性PLA片材,按重量份数包括如下组分,PLA树脂97份(30%结晶度)、滑石粉21份、植物纤维12份、丙烯酸酯类聚合物3份、甲基丙烯酸缩水甘油酯1份、扩链剂KL-E4370 5份、硬脂酸锌1份、抗氧剂1076 1份和单硬脂酸甘油酯1份。
其制备方法为:S1)准确称取各原料;S2)将PLA树脂、丙烯酸酯类聚合物、甲基丙烯酸缩水甘油酯、扩链剂KL-E 4370和硬脂酸锌加入到高速搅拌机中,混合15min,得到混合物料A;S3)将滑石粉、植物纤维、抗氧剂1076和单硬脂酸甘油酯加入到高速搅拌机中混合10min,得到混合物料B;S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
实施例5
一种增韧改性PLA片材,按重量份数包括如下组分,PLA树脂87份(20%结晶度)、滑石粉24份、植物纤维18份、醋酸乙烯共聚物5份、二苯亚甲基二异氰酸酯2份、扩链剂KL-E4370 4份、硬脂酸锌0.5份、抗氧剂1060 1份和单硬脂酸甘油酯1份。
其制备方法为:S1)准确称取各原料;S2)将PLA树脂、醋酸乙烯共聚物、二苯亚甲基二异氰酸酯、扩链剂KL-E 4370和硬脂酸锌加入到高速搅拌机中,混合10-20min,得到混合物料A;S3)将滑石粉、植物纤维、抗氧剂1060和单硬脂酸甘油酯加入到高速搅拌机中混合5-10min,得到混合物料B;S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
对比例1
相较于实施例1,本对比例中没有添加醋酸乙烯共聚物。
对比例2
相较于实施例1,本对比例中没有添加扩链剂Basf 4730和硬脂酸锌。
对比例3
相较于实施例1,本对比例中PLA树脂结晶度为40%。
应用实施例
将上述实施例和对比例制备的增韧改性PLA片材进行性能测试,
拉伸强度(MPa) | 断裂伸长率(%) | 弯曲强度(MPa) | |
实施例1 | 71.25 | 33.36 | 76.42 |
实施例2 | 70.87 | 32.81 | 75.91 |
实施例3 | 69.34 | 32.57 | 75.18 |
实施例4 | 71.22 | 33.08 | 74.94 |
实施例5 | 70.92 | 32.19 | 75.39 |
对比例1 | 63.83 | 28.26 | 48.37 |
对比例2 | 61.29 | 27.39 | 47.76 |
对比例3 | 71.36 | 21.83 | 52.97 |
通过以上数据可知,当原料中不加入增韧剂和/或扩链剂时,PLA片材的拉伸强度、断裂伸长率、弯曲强度均有所降低,尤其是弯曲强度下降更为明显,从而表现为韧性不足,而且PLA本身的结晶度对于弯曲强度上也会产生一定的影响。所以当原料中添加增韧剂和扩链剂后,具有优良的拉伸强度、断裂伸长率和弯曲强度等性能。
本文中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代,但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。
Claims (10)
1.一种增韧改性PLA片材,其特征在于,按重量份数包括如下组分,PLA树脂80-100份、填充矿粉20-25份、植物纤维10-20份、增韧剂2-5份、偶联剂1-5份、扩链剂1-5份、扩链促进剂0.5-2份、抗氧剂1-3份和润滑剂1-2份。
2.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述PLA树脂的结晶度为20-60%;所述植物纤维为500-1000目。
3.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述填充矿粉为碳酸钙、硅藻土和滑石粉中的一种或多种。
4.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述增韧剂为丙烯酸酯类聚合物、醋酸乙烯共聚物和乙烯共聚物中的一种或多种。
5.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述偶联剂为甲基丙烯酸缩水甘油酯、二苯亚甲基二异氰酸酯或硅烷偶联剂中的一种或多种。
6.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述扩链主剂扩链剂KL-E4370或扩链剂Basf 4730。
7.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述扩链促进剂为硬脂酸锌。
8.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述抗氧剂为抗氧剂1060、抗氧剂1076或抗氧剂168中的一种或多种。
9.根据权利要求1所述的增韧改性PLA片材,其特征在于,所述润滑剂为乙撑双硬脂酰胺或单硬脂酸甘油酯。
10.一种根据权利要求1至9任意一项所述的增韧改性PLA片材的制备方法,其特征在于,包括如下步骤,
S1)准确称取各原料;
S2)将PLA树脂、增韧剂、偶联剂、扩链剂和扩链促进剂加入到高速搅拌机中,混合10-20min,得到混合物料A;
S3)将填充矿粉、植物纤维、抗氧剂和润滑剂加入到高速搅拌机中混合5-10min,得到混合物料B;
S4)将混合物料A和混合物料B加入双螺杆挤出机中,经熔融、挤出、切片、干燥,制得增韧改性PLA片材。
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