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张宁 《中国石油和化工标准与质量》2018,(5)
简述氨纶干法纺丝甬道工艺背景,目前国内纺丝甬道热风温度升高受限、伴热不均匀,同时为满足环保需求、节能减耗、降低有害溶剂残留,对丝条通过纺丝甬道时变化过程进行分析,应用导热胶泥来提升纺丝甬道传热均匀性。通过已经建成的某6万吨/年氨纶项目的应用实例表明,在纺丝甬道上实施外伴热系统+导热胶泥的伴热方式,提高了外伴热系统与纺丝甬道间的热交换速率和设备间传热均匀性,保证了纺丝甬道能满足工艺需求。 相似文献
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模仿氨纶干法纺丝过程中的条件,研究氨纶成品复丝抱合力大小的主要影响因素。通过分析氨纶的DSC图谱、测定氨纶的软化温度、观察氨纶复丝抱合的横截面等方法,明确加热温度、加热时间、纺丝设备是氨纶复丝抱合力的主要影响因素;得出生产氨纶复丝的最佳工艺应该是加热温度为氨纶软化温度220℃,加热时间为20 s。此外,合适的纺丝设备对氨纶复丝抱合力也会有一定程度的影响。 相似文献
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目的:研究溶液干法纺丝中制备条件对氨纶力学性能的影响。方法:通过改变甬道风量、甬道温度制得12组氨纶样品。采用傅里叶红外光谱仪表征其微观结构。结论:当甬道风量从630 m~3/h增加到750 m~3/h时,氨纶300%弹性回复率和断裂伸长率都在逐渐增大,断裂强力逐渐减小。综合考虑,甬道风量为690m~3/h是为最佳。当甬道温度从242℃增加到250℃时,氨纶的300%弹性回复率,断裂伸长率和断裂强力都存在一个最佳值,考虑到对产品性能的影响和能耗,将温度定为248℃为最适宜。 相似文献
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简述了国内氨纶行业市场现状和发展趋势,并从差别化、功能化氨纶工艺开发,以及氨纶生产技术等方面对氨纶技术现状和发展趋势进行了论述。随着氨纶需求的不断扩大和氨纶产业技术的升级,我国氨纶生产能力从2009年的308 kt/a增长至2016年的688 kt/a,呈现供大于求的局面,行业盈利能力大幅下降,优势企业扩能步伐加速,行业集中度提高。差别化、功能化氨纶工艺开发已取得较大进展和突破,但氨纶在易染色、低温热定型、高伸长率/高强力等方面仍需进一步研究;未来氨纶在纺丝速度、溶液纺丝与熔融纺丝技术、产品的均一性及稳定性等方面仍有待技术突破。 相似文献
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Jang Ho Yun Dong Myeong Shin Joo Sung Lee Hyun Wook Jung Jae Chun Hyun 《Korean Journal of Chemical Engineering》2010,27(1):37-44
The sensitivity of the low- and high-speed spinning processes incorporated with flow-induced crystallization has been investigated
using frequency response method, based on process conditions employed in Lee et al. [1] and Shin et al. [2,3]. Crystallinity
occurring in the spinline makes the spinning system less sensitive to any disturbances when it has not reached its maximum
onto the spinline in comparison with the spinning case without crystallization. Whereas, the maximum crystallinity increases
the system sensitivity to disturbances, interestingly exhibiting high amplitude value of the spinline area at the take-up
in low frequency regime. It also turns out that neck-like deformation in the spinline under the high-speed spinning conditions
plays a key role in determining the sensitivity of the spinning system. 相似文献
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天然高分子作为一种资源,来源丰富且可再生利用,越来越引起广泛的关注。文章介绍了对天然高分子材料教学实践采取的一些改革措施,以纤维素、甲壳素及淀粉等天然高分子的结构与性质及其相互关系为主线展开教学内容,加深学生的高分子理论的基础知识,加强培养学生自学能力和创新理念。改革教学模式,在教学过程中提高学生的学习兴趣,加强教与学的互动,培养创新精神,以达到良好的教学目的。 相似文献
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微细旦涤纶POY稳态纺丝技术探讨 总被引:5,自引:0,他引:5
阐述微细旦涤纶POY从切片干燥、纺丝速度、熔体过滤、纺丝温度及压力、侧吹风控制等方面对纺丝过程的影响,并对其稳态纺丝技术作了初步探讨。指出影响稳态纺丝的因素很多,必须严格控制每一过程,使各因素得到最佳匹配,建立稳态纺丝。 相似文献
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The effects of the microcrystalline structure of undrawn fibers on the rheological behavior in the process of the polypropylene (PP) hollow fiber formation system were studied by a simple model describing the continuous drawing process. The predicted and observed drawing behaviors were explained in view of a simple approach based on the concept of strain-rate sensitivity and strain-hardening parameters. Various parametric studies showing the interactive nature of the strain-rate sensitivity and strain-hardening parameters on the drawing behavior were also numerically performed. Strain-rate sensitivity affects mainly the intensity of the neck, and strain hardening has more effects on the position of the inflection point in continuous drawing. Details of the necking mechanism in the drawing process were studied by observing the deformation behavior of the specimens with different initial microcrystalline structures. The distinctive initial structure of undrawn PP hollow fibers can be formed by controlling the quenching condition in melt spinning. It was shown that the water-quenched PP fiber exhibited an unstable smectic form, whereas the stable monoclinic phase was observed for the fiber prepared without quenching by forced convection. The experimental results of the drawing behavior indicated that the strain-rate sensitivity of the fiber with a smectic form was larger than that with the monoclinic form. It was also shown that the hollowness was affected by the quenching condition in melt spinning and the deformation behavior in the drawing process. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2170–2182, 2001 相似文献
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共混熔纺聚酯负离子纤维纺丝工艺探讨 总被引:1,自引:0,他引:1
探讨了添加奇冰石母粒与切片共混熔纺制取负离子纤维生产中的纺丝工艺。生产中母粒添加量为10%,纺丝温度和纺丝速度都低于常规纺时,可纺性良好。 相似文献