CN116199867A - 一种用于高效过滤熔喷布的聚乳酸材料 - Google Patents
一种用于高效过滤熔喷布的聚乳酸材料 Download PDFInfo
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Abstract
本发明公开一种用于高效过滤熔喷布的聚乳酸材料,涉及高分子合成材料技术领域,包括如下步骤:S1、将D‑丙交酯、引发剂、催化剂在预聚釜中120℃聚合后,导入管式聚合反应器中与L‑丙交酯混合并共聚合;S2、管式反应器的温度梯度为120℃‑140℃‑140℃‑160℃‑180℃,220℃‑250℃出料至脱挥罐;S3、脱挥后的物料在经过静态混合器时添加稳定剂,然后切粒、干燥、结晶制得;在常规熔喷设备中,螺杆至喷丝板温度设置为:180℃‑200℃‑220℃‑235℃‑260℃,热风温度260‑280℃,风压0.6‑1.2MPa,制得熔喷布经驻极处理后得到高滤效全降解聚乳酸熔喷布,本发明聚乳酸材料具有高熔点、高流动性、高稳定性,以及具有快速结晶特点,所制备熔喷滤材具有高滤效、易加工的特点。
Description
技术领域
本发明涉及高分子合成材料技术领域,具体的是一种用于高效过滤熔喷布的聚乳酸材料。
背景技术
熔喷非织造材料具有高防护、低滤阻且持久耐用的特点,在卫生防护、吸油材料、保暖透气面料领域应用广泛。对于一次性滤材,常用的聚丙烯类熔喷非织造布滤材经过使用后无法快速分解为环境无害小分子,而较细的纤维分散于自然环境中反而会危害人类健康,影响生态环境。聚乳酸是一种生物基来源,具有可生物降解特性的环保高分子材料,具备可纺性,其纤维制品经废弃后又可以分解为水和二氧化碳。制备基于聚乳酸的熔喷过滤材料取代现有不可降解聚丙烯熔喷滤材是未来的发展趋势。
中国专利CN202111245096.4公开了一种聚乳酸聚羟基脂肪酸酯熔喷非织造材料的制备方法。通过添加聚羟基脂肪酸酯与聚乳酸共混,在提高熔喷非织造材料的熔融指数的同时,提高熔喷非织造材料中的增韧效果,在保证拉伸强度变化不大下,改善熔喷非织造材料的韧性,提高熔喷非织造材料的断裂伸长率,既具备环境友好、可生物降解的性能。中国专利CN202110990267.X公开了一种聚乳酸熔喷料及其制备方法和应用。该组合物由聚乳酸、2,5-二甲基-2,5-双(叔丁基过氧)己烷、纳米成核剂、扩链剂、增韧剂、复合抗氧剂组成。该熔喷料以聚乳酸作为主体材料,具有可生物降解性。熔喷料制备的熔喷布具有较高的吸附性。中国专利CN202110870250.0公开了一种聚乳酸可降解型熔喷非织造材料的制备方法,具有优异的电荷持久性。中国专利CN201910877006.X公开了耐物理老化的聚乳酸熔喷无纺布材料及其制备方法。通过调控晶相/非晶相比例提供性能提升,可在仓储物流阶段保持尺寸和性能的稳定性,突破了常规聚乳酸熔喷无纺布的性能瓶颈。中国专利CN201810627255.9公开了耐高温聚乳酸熔喷驻极非织造过滤材料及其制备方法和用途。将不添加助剂的聚乳酸原料经熔喷加工工艺以及高压电晕驻极处理。中国专利CN201510305394.6公开了一种纳米蒙脱土/聚乳酸熔喷过滤材料。包括:聚乳酸、蒙脱土。该产品具有高效低阻的过滤效果,对于PM2.5可以起到很好的过滤效果,其过滤效果可以达到100%。中国专利CN201010167632.9公开了全降解聚乳酸纤维熔喷非织造布及其制备方法。该非织造布由聚乳酸切片在熔融温度下纺丝,经热空气拉伸后的纤维长丝通过自粘及热轧而成,对细菌的过滤效率达到95%以上,模头处温度降至180~185℃。
以上专利基于聚乳酸原料,进行组合物、熔喷工艺设计与调整,可制备具有一定应用效果的熔喷材料。本发明基于对化学合成分子结构设计理念,结合熔喷工艺对原料物理的要求,通过连续聚合工艺,制备具有优异可纺性能的聚乳酸熔喷专用树脂,以及相应的熔喷纤维制备工艺。
发明内容
为解决上述背景技术中提到的不足,本发明的目的在于提供一种用于高效过滤熔喷布的聚乳酸材料,本发明聚乳酸材料具有高熔点、高流动性、高稳定性,以及具有快速结晶特点,所制备熔喷滤材具有高滤效、易加工的特点。
本发明的目的可以通过以下技术方案实现:
一种用于高效过滤熔喷布的聚乳酸材料,包括如下步骤:
S1、将D-丙交酯、引发剂、催化剂在预聚釜中120℃聚合后,导入管式聚合反应器中与L-丙交酯混合并共聚合;
S2、管式反应器的温度梯度为120℃-140℃-140℃-160℃-180℃,220℃-250℃出料至脱挥罐;
S3、脱挥后的物料在经过静态混合器时添加稳定剂,然后切粒、干燥、结晶制得。
进一步地,所述D-丙交酯、L-丙交酯,其结构如下所示:
进一步地,所述D-丙交酯,L-丙交酯摩尔比为0.5:99.5-50:50。
进一步地,所述引发剂为单硬脂酸甘油酯、单月桂酸甘油酯、单油酸甘油酯中的一种,所述催化剂为辛酸亚锡。
进一步地,所述稳定剂包括:三[2.4-二叔丁基苯基]亚磷酸酯和β-(3,5-二叔丁基-4-羟基苯基)丙酸正十八碳醇酯,三[2.4-二叔丁基苯基]亚磷酸酯结构如下所示:
β-(3,5-二叔丁基-4-羟基苯基)丙酸正十八碳醇酯,其结构如下所示:
进一步地,所述引发剂,其添加量为丙交酯单体物质的量的0.02-0.3mo l%,所述催化剂添加量为丙交酯单体物质的量的0.1-0.3mo l%,所述稳定剂添加量为丙交酯单体物质的量的0.1-0.3mo l%。
进一步地,由上述方法制备的熔喷专用聚乳酸树脂,所述熔喷专用聚乳酸树脂,其数均分子量为3×104-7×104,分子量分布宽度不高于1.5,由上述方法制备的熔喷专用聚乳酸树脂,所述熔喷专用聚乳酸树脂,其熔点为178-250℃。
进一步地,所述熔喷布的制备方法为:在常规熔喷设备中,设置螺杆至喷丝板温度设置为:180℃-200℃-220℃-235℃-260℃,热风温度260-280℃,风压0.6-1.2MPa,制得熔喷布经驻极处理后得到高滤效全降解聚乳酸熔喷布。
本发明的有益效果:
本发明聚乳酸材料具有高熔点、高流动性、高稳定性,以及具有快速结晶特点,所制备熔喷滤材具有高滤效、易加工的特点。
附图说明
下面结合附图对本发明作进一步的说明。
图1是本发明熔喷聚乳酸原料合成及熔喷纤维制备工艺数据图;
图2是本发明聚乳酸熔喷树脂及熔喷布评价结果数据图。
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作出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
在本发明的描述中,需要理解的是,术语“开孔”、“上”、“下”、“厚度”、“顶”、“中”、“长度”、“内”、“四周”等指示方位或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的组件或元件必须具有特定的方位,以特定的方位构造和操作,因此不能理解为对本发明的限制。
比较例一
聚乳酸市售树脂,熔点165℃,旋光纯度98%,熔体流动速率35g/10mi n,2.16Kg,190℃。在熔喷设备中,将上述树脂加入料斗,设置螺杆至喷丝板温度设置为:180℃-200℃-220℃-235℃-260℃,热风温度280℃,风压1.2MPa,制得熔喷布经驻极处理后得到高滤效全降解聚乳酸熔喷布。原料及滤布评价结果见图2。
实施例1
将D-丙交酯0.5mo l、引发剂单硬脂酸甘油酯0.01mo l、催化剂辛酸亚锡0.3mo l在预聚釜中120℃聚合10mi n后,导入管式聚合反应器中与L-丙交酯混合并共聚合,管式反应器的温度梯度为120℃-140℃-140℃-160℃-180℃,220℃出料至脱挥罐。脱挥后的物料在经过静态混合器时添加稳定剂三[2.4-二叔丁基苯基]亚磷酸酯0.1mo l,然后切粒、干燥、结晶制得。
在熔喷设备中,加入熔喷专用聚乳酸树脂,设置螺杆至喷丝板温度设置为:180℃-200℃-220℃-235℃-260℃,热风温度280℃,风压1.2MPa,制得熔喷布经驻极处理后得到高滤效全降解聚乳酸熔喷布。原料及滤布制备工艺见图1,评价结果见图2。
实施例2-6
同实施例1的方法相同,改变其中原料、引发剂、催化剂、稳定剂等条件,制备得到熔喷聚乳酸树脂及滤材工艺见图1,评价结果见图2。
从图2中可看出,实施例1-6制得的产物的分子指标,结晶性能,熔喷布克重,滤效等均优于比较例,可知本发明通过在合成端进行结构设计所制备的产品具有更优的使用性能,可满足熔喷工艺要求,而纯聚乳酸无法采用熔喷工艺无法制得滤效满意的熔喷布。
工作原理,基于对化学合成分子结构设计理念,结合熔喷工艺对原料物理的要求,通过连续聚合工艺,制备具有优异可纺性能的聚乳酸熔喷专用树脂,以及相应的熔喷纤维制备工艺。
在本说明书的描述中,参考术语“一个实施例”、“示例”、“具体示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不一定指的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。
Claims (8)
1.一种用于高效过滤熔喷布的聚乳酸材料,其特征在于,包括如下步骤:
S1、将D-丙交酯、引发剂、催化剂在预聚釜中120℃聚合后,导入管式聚合反应器中与L-丙交酯混合并共聚合;
S2、管式反应器的温度梯度为120℃-140℃-140℃-160℃-180℃,220℃-250℃出料至脱挥罐;
S3、脱挥后的物料在经过静态混合器时添加稳定剂,然后切粒、干燥、结晶制得。
3.根据权利要求1所述一种用于高效过滤熔喷布的聚乳酸材料,其特征在于,所述D-丙交酯,L-丙交酯摩尔比为0.5:99.5-50:50。
4.根据权利要求1所述一种用于高效过滤熔喷布的聚乳酸材料,其特征在于,所述引发剂为单硬脂酸甘油酯、单月桂酸甘油酯、单油酸甘油酯中的一种,所述催化剂为辛酸亚锡。
6.根据权利要求1所述一种用于高效过滤熔喷布的聚乳酸材料,其特征在于,所述引发剂,其添加量为丙交酯单体物质的量的0.02-0.3mol%,所述催化剂添加量为丙交酯单体物质的量的0.1-0.3mol%,所述稳定剂添加量为丙交酯单体物质的量的0.1-0.3mol%。
7.根据权利要求1所述一种用于高效过滤熔喷布的聚乳酸材料,其特征在于,由上述方法制备的熔喷专用聚乳酸树脂,所述熔喷专用聚乳酸树脂,其数均分子量为3×104-7×104,分子量分布宽度不高于1.5,由上述方法制备的熔喷专用聚乳酸树脂,所述熔喷专用聚乳酸树脂,其熔点为178-250℃。
8.根据权利要求1所述一种用于高效过滤熔喷布的聚乳酸材料,其特征在于,所述熔喷布的制备方法为:在常规熔喷设备中,设置螺杆至喷丝板温度设置为:180℃-200℃-220℃-235℃-260℃,热风温度260-280℃,风压0.6-1.2MPa,制得熔喷布经驻极处理后得到高滤效全降解聚乳酸熔喷布。
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CN117306102B (zh) * | 2023-11-29 | 2024-02-20 | 烟台泰和新材高分子新材料研究院有限公司 | 一种用于制备聚氨酯弹性熔喷布的设备和方法 |
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