CN107858780A - 一种高强度高弹性弹簧状纤维束的制备方法 - Google Patents
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Abstract
本发明公开了一种高强度高弹性弹簧状纤维束制备方法,利用静电纺丝和加捻技术,并在制备过程中添加相应的塑化剂,本发明成功制备了弹簧状聚合物纤维束,该纤维束力学强度高、柔性好、拉伸应变大。本发明以聚合物为原材料,通过添加对应的塑化剂,获得了高强度高弹性弹簧状纤维束。该纤维束结构稳定,不自缠结不自解旋,尺寸和力学性能可控,有望用于可编织导电织物、可拉伸传感器和柔性电子领域。
Description
技术领域
本发明属于化学工程领域,具体涉及一种高强度高弹性弹簧状纤维束制备方法。
背景技术
由于具有独特的物理化学性能,弹簧状纤维束近年来受到越来越多的关注。目前,弹簧状纤维束主要是以碳纳米管或石墨烯为原材料,制备方法单一,且适用性不强。因此,如何发展一种新的适用性强的方法显得十分必要。另外,已报道的弹簧状纤维束拉伸性能不够好,所以如何进一步提升最大拉伸性能依然是实际应用中所面临的挑战。(参考文献:Li Y,Shang Y,He X,et al.Overtwisted,resolvable carbon nanotube yarnentanglement as strain sensors and rotational actuators.ACS nano,2013,7:8128.)。
发明内容
本发明提供了一种制备高强度高弹性弹簧状纤维束的方法,利用静电纺丝和加捻技术,并在制备过程中添加相应的塑化剂,本发明成功制备了弹簧状聚合物纤维束,该纤维束力学强度高、柔性好、拉伸应变大。
本发明提供一种高强度高弹性弹簧状纤维束,所述弹簧状纤维束强度高同时应变大,尺寸和力学性能均可控。
本发明所述制备高强度高弹性弹簧状纤维束的方法,具体包括以下步骤:
第一步,静电纺丝制备纤维膜;
配置前驱体溶液进行静电纺丝,选用滚筒收集纤维,进行纤维膜的制备,剪裁成长条。
第二步,加捻和过捻;
选取聚合物对应的塑化剂,滴加在长条上,同时进行加捻、过捻,至形成完全螺旋结构停止,获得高强度高弹性弹簧状纤维束。
第一步所述的前驱体溶液中,溶质为聚偏氟乙烯(PVDF)、聚己内酯(PCL)、聚丙烯腈(PAN)、聚乳酸(PLA)、聚偏氟乙烯-六氟丙烯(PVDF-HFP)、聚乳酸-羟基乙酸共聚物(PLGA)、尼龙(PA66)、聚氨酯(PU)中的一种;溶剂为丙酮、乙酸、N,N二甲基甲酰胺(DMF)、N,N二甲基乙酰胺(DMAc)和四氢呋喃(THF)中的一种或多种;溶液质量百分比浓度为8%~20%。
第一步所述的纤维膜中单根纤维的直径为50nm~2μm。
第一步所述的静电纺丝,滚筒的转速为50turns/min~3000turns/min,纺丝时间为2min~240min,工作电压为10~15kV,纺丝距离为15~20cm,溶液自然落下。
第一步所述的长条尺寸为长5cm~100cm,宽1cm~10cm。
第二步所述的塑化剂为N,N二甲基甲酰胺DMF、N,N二甲基乙酰胺DMAc、丙酮、乙醇、二氯甲烷、N-甲基吡咯烷酮NMP、甲醇中的一种,纯度含量均大于99.5%。
第二步所述塑化剂总共滴加次数为1次~10次,每次滴加0.5~2ml,滴加时间可以选择在加捻前、加捻中和加捻后中的某一个或某几个时期,确保添加的塑化剂可以使基底完全润湿。
第二步所述的加捻,电动马达的转速为50~500turns/min,加捻时间为1s~2min。
第二步所述的过捻,电动马达的转速为50~500turns/min,推进速度为2~10cm/min。
上述方法制备得到的所述的高强度高弹性弹簧状纤维束的直径为50μm~1000μm,圈数为1个/毫米~50个/毫米,拉伸应变为200%~4000%,弹性应变为100%~800%;拉伸强度为10MPa~300MPa。
本发明以聚合物为原材料,通过添加对应的塑化剂,获得了高强度高弹性弹簧状纤维束。该纤维束结构稳定,不自缠结不自解旋,尺寸和力学性能可控,有望用于可编织导电织物、可拉伸传感器和柔性电子领域。
本发明提供的方法与现有技术中制备弹簧状纤维束的方法相比,优良效果如下:
(1)首次利用外加塑化剂的方法制备高强度高弹性弹簧状纤维束,无须添加额外材料,塑化剂挥发后无残留。
(2)该方法制备的弹簧状纤维束以聚合物纤维为基础材料,轻质,拉伸性更好,尺寸易控。
(3)与现有的方法相比,本发明方法简单易控制,适用性强,能够实现大规模的制备。
附图说明
图1本发明静电纺丝及加捻过捻过程示意图;
图2本发明制备的高强度高弹性弹簧状纤维束实物图;
图3本发明中实施例5的高强度高弹性弹簧状纤维束的应力应变曲线。
具体实施方式
下面结合附图和实施例对本发明进行详细说明。
实施例1.
配置PA66前驱体溶液,溶剂为乙酸,质量百分比浓度为10%,进行静电纺丝,工作电压为10kV,纺丝距离为20cm,滚筒的转速为3000turns/min,1小时后得到单根纤维直径为50nm的纤维膜,剪成尺寸为长5cm宽1cm的长条。把长条两端分别固定在平移台和电动马达上,在加捻前,用2mL的注射器滴加0.5mL塑化剂乙醇于长条上,滴加1次,随后在乙醇挥发的过程中进行加捻,加捻中电动马达的转速为200turns/min,加捻时间为1s;然后过捻,电动马达的转速和加捻时相同,推进速度为5cm/min,具体操作过程如附图1所示,至形成完全螺旋结构停止,得到直径为50μm的高强度高弹性弹簧状纤维束,纤维束的圈数为4个/毫米。待干燥后进行拉伸力学测试,得到纤维束的拉伸应变为500%,弹性应变为300%;拉伸强度为150MPa,即得到高强度高弹性弹簧状纤维束。
实施例2.
配置PVDF前驱体溶液,溶剂是体积比为3:7的丙酮和N,N二甲基乙酰胺(DMAc),质量百分比浓度为20%,进行静电纺丝,工作电压为13kV,纺丝距离为20cm,滚筒的转速为50turns/min,50分钟后得到单根纤维直径为2μm的纤维膜,剪成尺寸为长100cm宽10cm的长条。把长条两端分别固定在平移台和电动马达上,在加捻中和加捻后,用2mL的注射器分别滴加塑化剂DMF于长条上2次,每次滴加1mL,随后在DMF挥发的过程中进行加捻,加捻过程中电动马达转速为100turns/min,加捻时间为30s;然后过捻,电动马达的转速和加捻时相同,推进速度为5cm/min,至形成完全螺旋结构停止,得到直径为1000μm的高强度高弹性弹簧状纤维束,纤维束的形貌如图2所示,纤维束的圈数为1个/毫米。待干燥后进行拉伸力学测试,得到纤维束的拉伸应变为1000%,弹性应变为500%;拉伸强度为100MPa。
实施例3.
配置PAN前驱体溶液,溶剂是质量比为1:1的丙酮和N,N二甲基甲酰胺(DMF),质量百分比浓度为10%,进行静电纺丝,工作电压为15kV,纺丝距离为15cm,滚筒的转速为1000turns/min,30分钟后得到单根纤维直径为200nm的纤维膜,剪成尺寸为长20cm宽2cm的长条。把长条两端分别固定在平移台和电动马达上,在加捻前和加捻后,用2mL的注射器分别滴加塑化剂丙酮于长条上3次,每次滴加2mL,随后在丙酮挥发的过程中进行加捻,加捻过程中电动马达的转速为500turns/min,加捻时间为50s;然后过捻,电动马达的转速和加捻时相同,推进速度为2cm/min,至形成完全螺旋结构停止,得到直径为500μm的高强度高弹性弹簧状纤维束,纤维束的圈数为6个/毫米。待干燥后进行拉伸力学测试,得到纤维束的拉伸应变为200%,弹性应变为100%;拉伸强度为300MPa。
实施例4.
配置PU前驱体溶液,溶剂是质量比为1:1的四氢呋喃(THF)和N,N二甲基甲酰胺(DMF),质量百分比浓度为8%,进行静电纺丝,工作电压为11kV,纺丝距离为15cm,滚筒的转速为2000turns/min,240分钟后得到单根纤维直径为60nm的纤维膜,剪成尺寸为长30cm宽3cm的长条。把长条两端分别固定在平移台和电动马达上,在加捻前和加捻后,用2mL的注射器分别滴加塑化剂乙醇于长条上10次,每次滴加1mL,随后在乙醇挥发的过程中进行加捻,加捻过程中电动马达的转速为50turns/min,加捻时间为1min;然后过捻,电动马达的转速和加捻时相同,推进速度为10cm/min,至形成完全螺旋结构停止,得到直径为1000μm的高强度高弹性弹簧状纤维束,纤维束的圈数为50个/毫米。待干燥后进行拉伸力学测试,得到纤维束的拉伸应变为4000%,弹性应变为800%;拉伸强度为10MPa。
实施例5.
配置PVDF-HFP前驱体溶液,溶剂是体积比为3:7的丙酮和N,N二甲基乙酰胺(DMAc),质量百分比浓度为15%,进行静电纺丝,工作电压为14kV,纺丝距离为15cm,滚筒的转速为1500turns/min,40分钟后得到单根纤维直径为250nm的纤维膜,剪成尺寸为长25cm宽2cm的长条。把长条两端分别固定在平移台和电动马达上,在加捻前和加捻后,用2mL的注射器分别滴加塑化剂乙醇于长条上2次,每次滴加0.5mL,随后在乙醇挥发的过程中进行加捻,加捻过程中电动马达的转速为150turns/min,加捻时间为2min;然后过捻,电动马达的转速和加捻时相同,推进速度为2cm/min,至形成完全螺旋结构停止,得到直径为50μm的纤维束,纤维束的圈数为5个/毫米。待干燥后进行拉伸力学测试,其拉伸应力应变曲线如图3所示,计算得到纤维束的拉伸应变为1560%,弹性应变为600%;拉伸强度为123MPa。
Claims (8)
1.一种高强度高弹性弹簧状纤维束制备方法,其特征在于:具体包括以下步骤:
第一步,静电纺丝制备纤维膜:
配置前驱体溶液进行静电纺丝,选用滚筒收集纤维,进行纤维膜的制备,将纤维膜沿纤维取向剪裁成长条;
第二步,加捻和过捻:
选取聚合物对应的塑化剂,滴加在长条上进行加捻,加捻后进行过捻,至形成完全螺旋结构停止,获得高强度高弹性弹簧状纤维束。
2.根据权利要求1所述的一种高强度高弹性弹簧状纤维束制备方法,其特征在于:第一步所述的前驱体溶液中,溶质为聚偏氟乙烯PVDF、聚己内酯PCL、聚丙烯腈PAN、聚乳酸PLA、聚偏氟乙烯-六氟丙烯PVDF-HFP、聚乳酸-羟基乙酸共聚物PLGA、尼龙PA66、聚氨酯PU中的一种;溶剂为丙酮、乙酸、N,N二甲基甲酰胺DMF、N,N二甲基乙酰胺DMAc和四氢呋喃THF中的一种或多种;前驱体溶液的质量百分比浓度为8%~20%。
3.根据权利要求1所述的一种高强度高弹性弹簧状纤维束制备方法,其特征在于:第一步所述的静电纺丝,滚筒的转速为50turns/min~3000turns/min,纺丝时间为2min~240min,工作电压为10~15kV,纺丝距离为15~20cm,溶液自然落下。
4.根据权利要求1所述的一种高强度高弹性弹簧状纤维束制备方法,其特征在于:第一步所述的纤维膜中,单根纤维的直径为50nm~2μm;所述的长条尺寸为长5cm~100cm,宽1cm~10cm。
5.根据权利要求1所述的一种高强度高弹性弹簧状纤维束制备方法,其特征在于:第二步所述的塑化剂为N,N二甲基甲酰胺DMF、N,N二甲基乙酰胺DMAc、丙酮、乙醇、二氯甲烷、N-甲基吡咯烷酮NMP、甲醇中的一种,纯度含量均大于99.5wt.%;总共滴加次数为1次~10次,每次滴加0.5~2ml,滴加时间选择在加捻前、加捻中和加捻后中的某一个或某几个时期,确保添加的塑化剂使基底完全润湿。
6.根据权利要求1所述的一种高强度高弹性弹簧状纤维束制备方法,其特征在于:第二步所述的加捻,电动马达的转速为50~500turns/min,,加捻时间为1s~2min。
7.根据权利要求1所述的一种高强度高弹性弹簧状纤维束制备方法,其特征在于:第二步所述的过捻,电动马达的转速为50~500turns/min,推进速度为2~10cm/min。
8.一种高强度高弹性弹簧状纤维束,其特征在于:所述弹簧状纤维束直径为50μm~1000μm;圈数为1个/毫米~50个/毫米;拉伸应变为200%~4000%;弹性应变为100%~800%;拉伸强度为10MPa~300MPa。
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