166dtex/288f+44dtex涤氨空包纱一步法生产工艺

探讨了采用一体机一步法生产多孔166 dtex/288 f+44 dtex涤氨空包纱的主要工艺。结果表明:在一体机上生产时,涤纶的拉伸比选择1.62,上热箱温度控制在185℃,D/Y为1.70,氨纶的牵伸比为3.5,网络喷嘴采用1.6 mm带涡流腔椭圆孔,网络压力控制在0.3 MPa,机台速度为680 m/mim,可使多孔166 dtex/288 f+44 dtex涤氨空包纱生产过程稳定,产品品质可控,性能指标满足客户需求。     

高密度涤锦复合超细纤维DTY的研发

运用我厂生产的高密度涤纶复合超细纤维POY加工55 dtex/24 f DTY时,在保证物理外观、顺利织造的前提下,设定一热箱温度145℃,关闭二热箱,加0罗拉和1罗拉上预网络,拉伸倍数1.67,才能满足于高密度涤锦复合丝的顺利生产及指标要求。     

PA6 FDY条干不匀率的影响因素探讨

采用相对黏度2.49的聚己内酰胺(PA6)切片高速纺丝生产PA6全拉伸丝(FDY),探讨了生产过程中PA6 FDY条干不匀率的影响因素。结果表明:在一定范围内,随着单体抽吸气流速度的增加,纤维条干不匀率降低,气流速度宜控制在1.60~1.70 m/s;生产同等规格的产品时,选择较大直径的喷丝板,纤维条干不匀率较小;上油率对纤维条干不匀率的影响较大,宜控制在1.25%~1.45%;控制侧吹风速度0.50~0.65m/s,温度18~20℃,相对湿度(80±5)%,有利于降低纤维的条干不匀率;生产44 dtex/34 f PA6 FDY,条干不匀率可控制在1.13%~1.17%。     

涤/锦复合丝质量影响因素的探讨

从涤/锦复合纺丝设备和工艺两大方面对影响涤/锦复合丝质量的因素进行了分析和探讨,明确了组件加工精度和涤、锦两种熔体黏度接近是纺好涤锦复合丝的关键。     

涤纶高速纺降低POYU%的探讨

<正> 众所周知,涤纶高速纺丝中POY的条干不匀率(U％)是评定POY质量,并进而预测DTY质量的重要指标之一。条干不匀率大时会给后加工带来困难,如假捻张力波动,产生竹节丝、僵丝等疵点,生产中断头率增加,毛丝增多,同时短距离的不匀更易产生染色不匀等严重后果。条干不匀率的大小也能间接地反映纤度不匀、强度与伸度不匀。因此,     

涤/锦复合剥离型POY生产工艺探讨

本文介绍了涤/锦复合POY长丝的生产工艺流程,同时论述了在生产过程中对产品性能及质量指标产生较大影响的工艺参数,特别对切片干燥,纺丝温度及冷却条件等工艺参数进行了详细讨论。     

涤锦复合丝的用途及生产工艺探讨

简单介绍涤锦复合丝一般品种的后道加工及用途,控制好纺丝工艺中涤、锦切片的含水率、纺丝温度、纺丝组件、侧吹风等工艺参数,对加弹工艺中静电问题、网络点问题、成型问题、假捻接触压力等及时进行解决,可以生产出满足市场要求的产品。     

细旦涤纶低弹网络丝的生产工艺

研究了 83.3dtex/ 72 f细旦涤纶低弹网络丝在生产过程中纺丝温度、上油率、POY断裂伸长、条干不匀率、网络工艺等因素对生产的影响。结果表明 ,纺丝温度 2 88℃ ,上油率控制在 0 .5%～ 0 .6 %,条干不匀率小于 3.75%,网络工艺控制要防止出现飘丝 ,可生产出优质细旦纤维。     

POY-FDY涤涤复合丝设备改造及常见异常处理

主要介绍了为实现POY-FDY涤涤复合丝的生产,如何对喷丝板、冷却送风装置、上油装置进行选择设计、POY-FDY如何实现复合、网络压空如何改造以及生产中常见的上油不均、冷却不足、跳丝、缠丝、断头等异常的处理.     

米字型涤锦复合丝生产设备、工艺探讨

以北京中丽设备纺丝实例,来分析米字型涤锦复合丝POY,DTY工艺设备以及影响因素。     

陶瓷膜一步清洗法可行性研究

对大庆油田采油五厂ZrO2陶瓷膜超滤处理油田采出污水中试装置进行了一步清洗法的可行性研究,讨论和分析了3种一步清洗方案的效果。研究表明,全渗透清洗时间长短和药剂的加入方式对清洗效果有重要的影响。试验在全渗透清洗20 min,无渗透清洗100 min,药剂一次性加入的清洗条件下,能够获得高、低压端通量恢复率分别高于75%和90%,无反冲下膜正常运行时间不少于50 h,反冲下运行260 h。清洗方案合适的条件下,一步清洗法是完全可行、可靠的,具有操作过程简单、成本低、节约能源等优点,工业应用前景良好。     

超高碱值合成磺酸镁的研制与生产

以UOP脱氢工艺重烷基苯工业磺酸和工业氧化镁为主要原料 ,采用高效促进剂体系 ,按确定的一步法工艺技术 ,在中型及大规模生产装置上生产质量和性能优异的超高碱值合成磺酸镁工业产品。     

Rapid preparation of low thermal expansion transparent LAS nanocrystalline glass by one-step thermoelectric treatment

The Li₂O–Al₂O₃–SiO₂ (LAS) glass ceramics are prepared by one-step thermoelectric treatment. The influence of thermoelectric treatments on LAS glass-ceramics were studied. The crystal phase composition and microstructure of the LAS glass-ceramics were investigated by DSC, SEM, XRD and FTIR. Moreover, the thermal expansion performance and light transmittance of LAS nanocrystalline glass were characterized. The results show that low-expansion transparent LAS nanocrystalline glass can be produced in a short time by thermoelectric treatment. The free energy of nucleation and the degree of polymerization of the glass network are reduced by the electric field. The key is that the electric field polarizes Ti and Zr ions at the crystallization temperature, so that the crystal nuclei repel the same poles. This allows uniform crystal distribution, promotes crystallization and reduces one-step crystallization of crystal agglomeration. This proves that the rapid preparation of nanocrystalline glass by the one-step method is feasible, and provides a reference for the future one-step processing of glass-ceramics.     

Formation of Porous SiC Ceramics by Pyrolysis of Wood Impregnated with Silica

Biomorphous β-SiC ceramics were produced at 1400°C from pine wood impregnated with silica. This one-step carbothermal reduction process decreases the cost of manufacturing of SiC ceramics compared with siliconization of carbonized wood in silicon vapor. The synthesized sample exhibits a 14 m²/g surface area and has a hybrid pore structure with large 5–20 μm tubular macropores and small (<50 nm) slit-shaped mesopores. SiC whiskers of 20–400 nm in diameter and 5–20 μm in length formed within the tubular pores. These whiskers are expected to improve the filtration by removing dust particles that could otherwise penetrate through large pores. After ultrasonic milling, the powdered sample showed an average particle size of ∼30 nm. The SiC nanopowder produced in this process may be used for manufacturing SiC ceramics for structural, tribological, and other applications.     

One-step solution combustion synthesis of K0.5Na0.5NbO3 powders at a large-scale

In this work, fine powders of K_0.5Na_0.5NbO₃ (KNN) are produced by a single step of solution combustion synthesis (SCS) using glycine as the reductant fuel and potassium & sodium nitrates as the oxidizers, which are mixed with niobium oxide. Single phase of KNN products can be successfully prepared in a one-step SCS by adjusting the glycine-nitrate ratio. It is concluded that the stoichiometric or slightly fuel-excess condition is good for the single step production of KNN. The one-step SCS of KNN also shows good scaling-up productivity, which can be ignited by both electric heating and microwave heating. This work may provide a feasible large-scale production of various functional oxides by a one-step SCS process.     

MDI-50在耐溶剂聚氨酯弹性体中的应用研究

分别采用MDI-50、TDI-65和TDI-80与聚酯多元醇反应制得低硬度耐溶剂聚氨酯弹性体制品。结果表明，MDI-50可替代毒性较大的TDI，用于一步法耐溶剂聚氨酯弹性体的制作。     

姜黄粒度对超临界CO_2萃取染色一步法的影响

依据萃取釜的微元高度列质量衡算方程,采用Crank-Nicolson方差法求解,得到了超临界流体萃取姜黄颗粒的收缩核模型。取姜黄粒度大小0.5—5 mm、温度70—90℃、压力23—27 MPa、时间50—90 min的条件下,分别对蛋白质织物、纤维素织物及化学纤维织物进行了超临界萃取染色一步法实验。结合电子测色配色仪、分光光度仪,分析了姜黄粒度大小对超临界CO2萃取染色一步法的影响。结果表明,在实验选取的姜黄粒度大小范围内,粒度越小3种织物的萃取染色效果越好,其蛋白质织物的最优工艺为:粒度0.5 mm、压力27 MPa、温度80℃、时间50 min。     

腈纶NaSCN一步法生产中调整喷丝头负拉伸率的研究

采用硫氰酸钠为溶剂,湿纺一步法工艺生产腈纶,探讨了喷丝头负拉伸率对纤维成形的影响。工业化试验表明:当喷丝头负拉伸率为-73％时,纤维可纺性达到最佳状态。     

用一水糖生产无色透明烷基糖苷的技术及展望

比较了烷基糖苷工业生产技术路线的优缺点,总结了技术关键。介绍了用一水糖一步法生产无色透明烷基糖苷的技术及创新点,展望了技术推广应用前景。     

A sheet-like porous carbon for high-rate supercapacitors produced by the carbonization of an eggplant

N-doped porous carbon sheets are produced by a one-step carbonization of a selected biomass precursor, eggplant. Such a carbon synergistically inherits sheet-like microstructure and naturally rich nitrogen in eggplant and shows excellent rate performance as a supercapacitor electrode due to the short ion diffusion paths.