CN110747519A - 一种高强聚丙烯纤维的制备方法 - Google Patents
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Abstract
本发明公开了一种高强聚丙烯纤维的制备方法,其制备方法包括:将聚丙烯粒料放入纺丝机料斗中,经过230℃下的喷丝板挤出,在喷丝板正下方8cm处设置一个长度为1.2m、水温70℃的水槽。喷丝板喷出的熔体细流通过水槽中进行第一步水冷,再进行第二步环形风冷,温度为30℃。将经过两步冷却的聚丙烯纤维上柔顺剂,然后将所得到的纤维在辊温为65℃、转速为180m/min的一辊上缠绕5圈,再在辊温为85℃、转速为800m/min的二辊上缠绕8圈,得到聚丙烯纤维。本发明可以使可以使聚丙烯纤维的断裂伸长率大于249%,回弹率大于115%,断裂强度大于8.2cN·dtex‑1,可用于制作高强聚丙烯纤维。
Description
技术领域
本发明涉及纺丝领域,尤其涉及一种高强聚丙烯纤维的制备方法。
背景技术
聚丙烯纤维在我们的生活中的应用十分广泛,同时也是质地最轻的合成纤维。聚丙烯纤维具有良好的机械性能、耐磨性和吸湿性,尤其是其价格低廉。此外,聚丙烯纤维耐化学性优良,常温下有良好的耐酸碱性以及耐虫蛀性。因此,聚丙烯纤维十分适合应用在船用绳缆及深海作业中。而传统聚丙烯绳缆的制作均是使用纺丝机通过喷丝板挤出、经过风冷、一段牵伸、二段牵伸最后成丝,这种方法制备出来的传统聚丙烯绳缆应用在海上作业的船只上时,往往会因为强度不够而使聚丙烯绳缆无法正常的发挥自身的作用,对航海作业产生很大的影响。
目前国内提高聚丙烯纤维的方法主要就是添加无机填料作为增强相从而提高聚丙烯纤维的强度。这样的增强方法虽然能够发挥聚丙烯纤维中无机填料增强的作用,但是聚丙烯属于高分子材料,而无机填料与高分子材料的相容性一般比较差,如果应用于海洋中,那么海洋中会存在巨大温差和相当大的盐度,所添加的无机填料以及各种添加剂能否适应海洋中的环境,以及会不会被腐蚀,就成为了无机填料增强聚丙烯纤维所需要解决的问题。
发明内容
本发明要解决现阶段聚丙烯纤维强度差的技术问题,提供一种高强聚丙烯纤维的制备方法。
本发明所采取的技术方案是:一种高强聚丙烯纤维的制备方法,包括如下步骤:(1)将聚丙烯粒料放入纺丝机料斗中,经过230℃下的喷丝板挤出;(2)在距离喷丝板正下方8cm 处和风冷装置之间设置一个水槽,水槽长度为1.2m、水温为70℃,将步骤(1)通过喷丝板喷出的聚丙烯熔体细流通过水槽中进行第一步水冷;(3)将步骤(2)经过水冷的聚丙烯熔体细流进行第二步环形风冷,风冷温度为30℃;(4)将(3)所得经过一步水冷二步风冷的聚丙烯纤维上柔顺剂;(5)在一辊温度为65℃,一辊辊速为180m/min的条件下将(4)得到的纤维在一辊上缠绕5圈下牵伸;(6)在二辊温度为85℃,二辊辊速为800m/min的条件下将(5)得到的纤维在二辊上缠绕8圈得到二次牵伸后的聚丙烯纤维。
本发明一种高强聚丙烯纤维的制备方法,可以使聚丙烯纤维的断裂伸长率大于249%,回弹率大于115%,断裂强度大于8.2cN·dtex-1。
本发明一种高强聚丙烯纤维的制备方法具有以下优点:
(1)本发明将喷丝板的温度设置为230℃,代替了传统熔体纺丝喷丝板温度200~210 ℃之间。设置高温度的意义主要在于纤维拉伸时的温度必须处于玻璃化温度和分解温度之间,由于本发明使用了水槽冷却,所以提高喷丝板的温度既能避免在纺丝过程中起毛的出现,又能降低熔体粘度的作用,使得从喷丝板挤出的熔体细流粘度降低,以便于后续的拉伸和牵引,进而保证了纤维的强度。
(2)本发明在喷丝板正下方和风冷装置之间设置一个水槽,改变了传统熔体纺丝从喷丝板挤出熔体细流之后直接进入风冷冷却的步骤,水槽设置的位置是在距离喷丝板8cm处设置,在这个距离设置水槽的目的就在于能够让熔体细流的冷却条件稳定,因为聚丙烯熔体细流从喷丝板离开约10cm时,温度仍然很高,在自身重力和卷绕张力的作用下容易被拉长变细,还存在断丝的现象,所以在8cm处设置水槽就是为了使熔体细流的冷却条件更加稳定,避免断丝,水槽的长度设置为1.2m,其目的就是为了降低从高温喷丝板中挤出的熔体细流的温度,在拉伸之前预成型。而水槽长度为1.2米代替了传统长度为1.8m的水槽,目的是为了避免熔融细流在的水槽中冷却时间过长而使纤维缓慢固化影响拉伸效果,而设置水槽长度为1.2m恰恰能够使聚丙烯熔体细流在水槽中既得到缓慢冷却的作用,也能起到防止固化的现象发生,最终使得熔体细流不会因骤冷而出现起毛的现象。
(3)本发明将水槽温度设置为70℃,其目的在于从喷丝板挤出的熔体细流温度仍然很高,在30℃的风冷进行冷却之前需要进行70℃的恒温水槽起到缓冲降温的过程,因为初生纤维的塑性大、强度低,需要通过冷拉伸才能提高强度,而选取的水温为70℃恰恰能够让熔体细流在通过水冷之后,不至于受到快速冷却而导致下一步拉伸困难,水温过低就会造成纤维拉伸受到影响,然后再进入30℃风冷冷却之前起到缓冲的作用,保证了纤维的完整性。
(4)本发明将经过水冷和风冷之后的聚丙烯纤维通过柔顺剂处理,代替了传统聚丙烯纺丝过程中使用抗静电剂,目的就是为了防止聚丙烯在纺丝过程中发生静电,引起纤维表面出现起毛的现象,将一束纤维通过柔顺剂之后不但不会影响聚丙烯纤维的力学性能,防止静电的产生同时还能够减少纤维间的起毛,使得纺出的聚丙烯纤维表面更平整,进一步提高聚丙烯纤维的强度。
(5)本发明选择的柔顺剂是有机硅柔顺剂双棕榈酸乙酯基羟乙基甲基硫酸铵和天然油脂进行1∶0.2复配,代替了传统季铵盐型柔顺剂如二硬脂基二甲基氯化铵,目的就是为了选择更容易突出降解性的柔顺剂,同时这种柔顺剂还可使制品应用在水中,与天然油脂复配还能够提高纤维使用寿命,产品适合于海洋绳缆。
(6)本发明将一辊温度设置为65℃,一辊辊速设置为180m/min并将聚丙烯纤维在一辊上缠绕5圈。这是代替了传统熔体纺丝工艺上一辊温度55℃,一辊辊速为120m/min,缠绕3 圈。这样做的目的在于本发明已经在风冷前面增加了提供水冷的水槽,所以在通过柔顺剂之后的聚丙烯纤维由于其冷却条件稳定,因此此时的聚丙烯纤维就比传统熔体纺丝工艺加工出来的聚丙烯纤维强度要大,所以能够承受辊温高、缠绕速度快以及缠绕圈数多的加工条件。
(7)本发明将二辊温度设置为85℃,二辊辊速设置为800m/min并将聚丙烯纤维在二辊上缠绕8圈。这是代替了传统熔体纺丝工艺上二辊温度80℃,二辊辊速为500m/min并缠绕5 圈。这样做的目的在于二段牵伸是决定聚丙烯纤维强度的关键牵伸步骤,加快卷绕速度能够降低聚丙烯纤维的断裂伸长率,进一步提高强度。因此本发明的聚丙烯纤维在二段牵伸时能够使用800m/min的卷绕速度,通过一段牵伸和二段牵伸之后才能得到强度足够大的聚丙烯纤维。
(8)本发明的牵伸比为4.44,替代了传统纺丝工艺的牵伸比,传统纺丝工艺的牵伸比在2左右,由于本发明在原料经过喷丝板形成熔体细流之后就对其冷却方式改进为二次冷却,所以经过一段牵伸后的纤维能够完全适应4.44这一牵伸比,而大于这一数值就容易造成纤维在二段牵伸时发生断丝现象,最终导致整体纺丝作业的失败。因此针对本发明的一种高强聚丙烯纤维的制备方法,就需要设置纺丝的牵伸比为4.44。
具体实施方式
下面结合具体实施例对本发明作进一步详细阐述。
实施例1
将聚丙烯粒料放入纺丝机料斗中经过230℃下的喷丝板挤出,在距离喷丝板正下方8cm 处和风冷装置之间的位置设置一个水槽,水槽长度为1.2m、水温为70℃。通过将喷丝板喷出的聚丙烯熔体细流通过水槽中进行第一步水冷后,将经过水冷的聚丙烯熔体细流进行第二步环形风冷,风冷温度为30℃。将所得经过一步水冷二步风冷的聚丙烯纤维上柔顺剂,在一辊温度为65℃的条件下将通过柔顺剂所得到的纤维在一辊上缠绕5圈,一辊转速为180m/min,然后把纤维在二辊温度为85℃的条件下在二辊上缠绕8圈,二辊转速为800m/min,得到二次牵伸后的聚丙烯纤维。
实施例2-6的水槽温度、风冷温度、一辊温度、一辊转速、以及在一辊二辊上缠绕的圈数与实施例1的相同,成型方法分别如下:
实施例2
本实施例的喷丝板温度为235℃,二辊温度为85℃,二辊转速为800m/min。
实施例3
本实施例的喷丝板温度为230℃,二辊温度为85℃,二辊转速为820m/min。
实施例4
本实施例的喷丝板温度为230℃,二辊温度为85℃,二辊转速为780m/min。
实施例5
本实施例的喷丝板温度为230℃,二辊温度为90℃,二辊转速为800m/min。
实施例6
本实施例的喷丝板温度为230℃,二辊温度为80℃,二辊转速为800m/min。
实施例1-6的一种高强聚丙烯纤维的部分性能数据如表1所示。
表1实施例1-6一种高强聚丙烯纤维的性能
从表1可以看出,本发明制备的一种高强聚丙烯纤维的断裂伸长率、回弹率、断裂强度都优于传统聚丙烯纤维的标准,增加水槽、改变前身速度使得聚丙烯纤维的强度有了很大的提高,应用在海洋中制作成海洋绳缆时也能很好的保证其自身的强度。
Claims (7)
1.一种高强聚丙烯纤维的制备方法,其特征在于,(1)将聚丙烯粒料放入纺丝机料斗中;(2)在喷丝板和风冷装置之间的位置设置一个水槽,再将(1)通过喷丝板喷出的聚丙烯熔体细流通过水槽中进行第一步水冷;(3)将步骤(2)经过水冷的聚丙烯熔体细流进行第二步环形风冷,风冷温度为30℃;(4)将(3)所得经过一步水冷二步风冷的聚丙烯纤维上柔顺剂;(5)将(4)得到的纤维在一辊上牵伸;(6)将(5)得到的纤维在二辊上牵伸,最终得到二次牵伸后的聚丙烯纤维。
2.根据权利要求1所述的一种高强聚丙烯纤维的制备方法,其特征在于所述的喷丝板温度为230℃。
3.根据权利要求1所述的一种高强聚丙烯纤维的制备方法,其特征在于所述的水槽位置是在距离喷丝板正下方8cm处和风冷装置之间,水槽长度为1.2m,水槽中的水温为70℃。
4.根据权利要求1所述的一种高强聚丙烯纤维的制备方法,其特征在于所述的柔顺剂为双棕榈酸乙酯基羟乙基甲基硫酸铵与天然油脂进行1∶0.2复配。
5.根据权利要求1所述的一种高强聚丙烯纤维的制备方法,其特征在于所述的一辊温度为65℃,一辊辊速为180m/min,将纤维缠绕5圈。
6.根据权利要求1所述的一种高强聚丙烯纤维的制备方法,其特征在于所述的二辊温度为85℃,二辊辊速为800m/min,将纤维缠绕8圈。
7.根据权利要求1所述的一种高强聚丙烯纤维的制备方法,其特征在于所述的牵伸比为4.44。
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