试论我国锦纶生产发展方向

回顾了锦纶发展简史，综述了国内锦纶生产现状，并论述了我国锦纶生产发展方向，必须大力发展原料工业；加快老企业的设备改造；使其达到规模经济，大力发展差别化、高附加值、功能性纤维。同时，提出了锦纶各品种的发展趋向。     

Influence of Processing Variables on Dynamic Mechanical Response of Laser-Sintered Glass-Filled Polyamide

For establishing selective laser sintering in manufacturing technology, a wide knowledge about the influence of processing variables on the quality of sintered part is mandatory. In this regard, this article addresses the influence of key process parameters (i.e., bed temperature, laser power, beam speed, hatch distance, hatch length) on the dynamic mechanical properties of laser-sintered glass-filled polyamide specimens to enhance their service life. A face-centered central composite design of response surface methodology was employed to gather data, and mathematical models were developed to investigate the effects and interactions of selected input processing variables on the different performance characteristics. Experiments revealed that dynamic mechanical properties reduced with decrease in bed temperature. This was due to nonuniform fusion of powder particles and increased porosity. Specimens fabricated at high energy density (ED) were strong, solid, and isotropic but become weak, porous, and anisotropic, as the ED decreased. Poor material integrity and weak interparticle bonding were the main reasons of low dynamic mechanical strength. In addition, microstructural analysis was also performed to examine the surface morphology of sintered specimens. Further, optimum working conditions for producing parts with maximum dynamic mechanical response were determined.     

酸性pH滑移剂对锦纶织物染色性能的研究

对自制酸性pH滑移剂EY与日产酸性pH滑移剂PC的滑移性能进行了对比 ,试验表明 ,只要在酸性pH滑移剂EY中加入微量催酸剂K ,其滑移性能与日产酸性pH滑移剂PC接近。同时 ,两者对锦纶织物的染色性能与传统醋酸染色工艺相比 ,它们的竭染率相似 ,但匀染性明显好于醋酸染色工艺。     

R型及KE型活性染料在锦／棉染色中的应用

R型／中性－浴染色可将染色时间从原来的10h缩短为4－5h,修色可降温后直接加料。由于中性条件固色,避免碱性条件下的锦纶手感损伤。KE型活性染料染色后,在染锦纶时pH值不可太低,以6－7为宜,避免酸性条件下染料－纤维键断裂。     

Structure characterization of heat set and drawn polyamide 66 fibers by FTIR spectroscopy

Structural changes that occur during thermally induced and strain induced crystallization of polyamide 66 fibers were studied by infrared spectroscopy, density measurement and optical microscopy. Two bands at 924 and 1136 cm^–1 were shown to arise from the amorphous phase and assignment of the bands at 936 and 1200 cm^–1 to the crystalline phase were confirmed. We demonstrated that two different infrared spectroscopic methods could be used to determine the total crystallinity of polyamide 66 fibers. One is a calibration method in which the band ratio of 1200 and 1630 cm^–1 is plotted against the crystallinity measured by density measurements. The other one is an independent infrared method. Crystallinity obtained by the independent infrared spectroscopic method showed good agreement with crystallinity observed by density measurement. Infrared dichroism was used to obtain the crystalline orientation using the band at 936 cm^–1. The transition moment angle of 48° was found for the band at 936 cm^–1 with respect to chain axis. Amorphous orientation was obtained using Stein’s equation. Received: 18 September 2000 / Reviewed and accepted: 20 September 2000     

聚苯醚／聚酰胺合金的进展

介绍了聚苯醚／聚酰胺合金的开发现状,主要性能、应用领域及技术进展。     

Preparation and Tribological Properties of Polyamide 11/Graphene Coatings

Polyamide 11/graphene coatings were prepared through a spraying method with as-prepared organophilic graphene. The tribological results showed that the wear life of composite coatings was obviously higher than that of neat Polyamide 11 coating; however, the values of friction coefficients had hardly changed. The optimal content of graphene in the range of our experiments was 0.4 wt%, and the wear life of the composite coating increased by 460%–880% compared with that of pristine Polyamide 11 coating. The morphology of worn surface for both pristine Polyamide 11 and the composites coatings was studied, and the wear mechanisms were discussed.     

介绍几种新型防水材料及其在工程中的应用

焦油聚氨酯有毒、怕水、抗老化能力差 ,采用无莫卡固化剂 ,可以降低毒性 ,能在潮湿面施工。彩色及沥青焦油聚氨酯可以提高抗老化性能。膨胀焦油聚氨酯可代替膨胀橡皮 ,造价低 ,适用已建成的工程伸缩缝止水处理。水溶性环氧树脂适于有水面施工 ,克服了环氧树脂的缺陷 ,应用范围更加广泛。环氧聚氨酯具有刚中有柔的性能 ,适于特殊工程的处理     

聚酰胺树脂中胺值的测定

本文主要介绍用高氯酸一冰醋酸非水滴定法测定聚酰胺树脂中的胺值。该法简便、快速、灵敏且结果准确,可以作为聚酰胺树脂合成中控制其产品质量的主要质量中控方法。     

塑料斜齿轮注塑模具设计与分析

以聚酰胺6(PA6)斜齿轮塑件为对象,进行了一模四腔的注塑模具结构设计与分析,并实现了斜齿轮塑件的顺利脱模。