CN108588892A - 一种改善聚酰亚胺纤维染色性能的方法 - Google Patents
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Abstract
本发明公开一种改善聚酰亚胺纤维染色性能的方法,该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。所述有机改性层状硅酸盐的加入时间是在聚合过程中的二胺溶解后二酐添加前。有机改性层状硅酸盐的添加质量为总聚合物固含量的0.5%~5%。本发明方法通过在聚合过程中添加有机改性层状硅酸盐,改变了纤维分子链排列结构,提高空隙率,使得染料分子能快捷有效的扩散到纤维内部,改变其颜色。可以使原本极难上色的聚酰亚胺纤维能够通过载体染色法得到各种颜色的聚酰亚胺纤维,使得聚酰亚胺产品有更广阔的市场。
Description
技术领域
本发明涉及轻化工领域和纤维染色领域,特别是涉及一种聚酰亚胺改性方法。
背景技术
聚酰亚胺纤维的显著特征是耐高温,能在300℃的高温下长期工作,被誉为“黄金丝”。实际上因为聚酰亚胺纤维本体显金黄色,又极难染色,所以大多聚酰亚胺产品都是黄色。虽然有很多能领域需要聚酰亚胺的优异性能,但受其颜色影响导致应用市场被限制。改善聚酰亚胺染色性能迫在眉睫。
发明内容
本发明所解决的技术问题是提供一种改善聚酰亚胺纤维染色性能的方法,该方法通过改变纤维分子链排列结构,提高空隙率,使得染料分子能快捷有效的扩散到纤维内部,改变其颜色。
本发明所要解决的技术问题是通过以下的技术方案来实现的。本发明是一种改善聚酰亚胺纤维染色性能的方法,其特点是:该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。
本发明所述的方法,其进一步优选的技术方案是:所述有机改性层状硅酸盐的加入时间是在聚合过程中的二胺溶解后二酐添加前。本发明中有机改性层状硅酸盐的加入时间还可以是聚合过程中的其它步骤。
本发明所述的方法,其进一步优选的技术方案是:所述有机改性层状硅酸盐的添加质量为总聚合物固含量的0.5%~5%,优选1%~4%,再优选2%~3%。
本发明所述的方法,其进一步优选的技术方案是:所述有机改性层状硅酸盐选自有机改性膨润土、有机改性蒙脱土、有机改性凹凸棒土。所述的有机改性层状硅酸盐可以是市售产品,也可以是采用现有技术中公开的任何一种方法制得的有机改性层状硅酸盐。
本发明所述的方法,其进一步优选的技术方案是:其步骤如下:
(1)在聚酰亚胺聚合的某一过程中添加有机改性层状硅酸盐,使添加物完全溶解;
(2)将得到的聚合物纺丝,环化牵伸得到改性聚酰亚胺纤维。
本发明所述的方法,其进一步优选的技术方案是:将步骤(2)得到的改性聚酰亚胺纤维进行染色,得到染色改性聚酰亚胺纤维。
本发明所述的方法,其进一步优选的技术方案是:所述的染色采用高温高压载体法染色。
本发明所述的方法,其进一步优选的技术方案是:步骤(2)中所述纺丝为干法纺丝。
与现的技术相比,本发明的技术效果如下:
1、本发明方法通过在聚合过程中添加有机改性层状硅酸盐,改变了纤维分子链排列结构,提高空隙率,使得染料分子能快捷有效的扩散到纤维内部,改变其颜色。通过添加有机改性层状硅酸盐来破坏聚酰亚胺的规整性,增大结构中的孔隙,方便染料分子进入。层状硅酸盐本身在微观结构上有着纳米尺寸的层状材料,常用作插层纳米改性。
2、本发明方法通过纺丝得到的纤维可染,且纤维的指标与耐热性能均可以得到有效地提高。有机改性层状硅酸盐最终是以纳米结构存在于纤维中,对纤维的力学性能和耐热性能都有一定程度的提高。
3、本发明聚酰亚胺纤维改性方法能使原本很难上色的聚酰亚胺纤维能被染色,使其品种多样化,色丝加工过程简单化。应用市场变得更加广阔。
4、本发明通过高温高压载体染色法能提高透染率和加快染色效率。
具体实施方法
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明的一部分实例,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做出创造性劳动前提所获得的所有其它实施例,都属于本发明保护的范围。
实施例1,一种改善聚酰亚胺纤维染色性能的方法,该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。所述有机改性层状硅酸盐的加入时间是在聚合过程中的二胺溶解后二酐添加前。所述有机改性层状硅酸盐的添加质量为总聚合物固含量的0.5%。所述有机改性层状硅酸盐为有机改性膨润土。
实施例2,一种改善聚酰亚胺纤维染色性能的方法,该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。所述有机改性层状硅酸盐的加入时间是在聚合过程中的二胺溶解后二酐添加前。所述有机改性层状硅酸盐的添加质量为总聚合物固含量的5%。所述有机改性层状硅酸盐为有机改性蒙脱土。
实施例3,一种改善聚酰亚胺纤维染色性能的方法,该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。所述有机改性层状硅酸盐的加入时间是在聚合过程中。所述有机改性层状硅酸盐的添加质量为总聚合物固含量的3%。所述有机改性层状硅酸盐为有机改性凹凸棒土。
实施例4,一种改善聚酰亚胺纤维染色性能的方法,该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。所述有机改性层状硅酸盐的加入时间是在聚合过程中的二胺溶解后二酐添加前。所述有机改性层状硅酸盐的添加质量为总聚合物固含量的2.5%。所述有机改性层状硅酸盐为有机改性膨润土。
其具体步骤是:
(1)在做聚酰亚胺聚合时,溶解二胺后,将有机改性层状硅酸盐粉末添加到二胺溶液中使其完全溶解。改性层状硅酸盐的溶解度不太高,但能与二胺发生作用使其完全溶解到二胺溶液中。添加二酐得到聚酰胺酸的纺丝原液。
(2)将原液纺成丝,环化牵伸得到改性聚酰亚胺纤维;
(3)通过高温高压载体法,改性聚酰亚胺纤维染色。聚酰亚胺的致密结构使得染料分子不易渗入到纤维内部。使用高温高压载体法能有效增大纤维内部孔隙,方便染料分子进出,从而达到匀染透染的效果。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书内容所作的等效结构或等效流程变换,或直接或间接运用在其它相关的技术领域,均同理包括在本发明的专利保护范围内。
Claims (8)
1.一种改善聚酰亚胺纤维染色性能的方法,其特征在于,该方法是在聚酰亚胺聚合过程中添加有机改性层状硅酸盐。
2.根据权利要求1所述的方法,其特征在于:所述有机改性层状硅酸盐的加入时间是在聚合过程中的二胺溶解后二酐添加前。
3.根据权利要求1所述的方法,其特征在于:所述有机改性层状硅酸盐的添加质量为总聚合物固含量的0.5%~5%。
4.根据权利要求1所述的方法,其特征在于:所述有机改性层状硅酸盐选自有机改性膨润土、有机改性蒙脱土、有机改性凹凸棒土。
5.根据权利要求1所述的方法,其特征在于:其步骤如下:
(1)在聚酰亚胺聚合的某一过程中添加有机改性层状硅酸盐,使添加物完全溶解;
(2)将得到的聚合物纺丝,环化牵伸得到改性聚酰亚胺纤维。
6.根据权利要求5所述的方法,其特征在于:将步骤(2)得到的改性聚酰亚胺纤维进行染色,得到染色改性聚酰亚胺纤维。
7.根据权利要求6所述的改性方法,其特征在于,所述的染色采用高温高压载体法染色。
8.根据权利要求5所述的方法,其特征在于,步骤(2)中所述纺丝为干法纺丝。
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