油相材料的物化性质对粉状乳化炸药贮存稳定性的影响

粉状乳化炸药的贮存稳定性是评价粉状乳化炸药质量的重要指标,是粉状乳化炸药研究的重要课题。研究了粉状乳化炸药贮存稳定性的影响因素,介绍了油相材料的物化性质对粉状乳化炸药贮存稳定性的影响。     

粉状乳化炸药在爆炸(焊接)加工中的应用

阐述了爆炸焊接领域用药要求,以粉状乳化炸药在爆炸焊接领域应用情况,强调了粉状乳化炸药在爆炸焊接(加工)领域中高质量、环保的优点,进一步强调了粉状乳化炸药存在的必要性。     

浅议Ⅱ型粉状乳化炸药的生产实践与安全管理

通过近几年来Ⅱ型粉状乳化炸药的生产实践,针对Ⅱ型粉状乳化炸药的关键工序控制和安全管理总结经验,为提高粉状乳化炸药本质安全性提供依据,对实际生产具有一定的指导意义。     

粉状乳化炸药专用乳化剂的合成及应用

介绍了一种新型粉状乳化炸药专用乳化剂的制备原理、制备工艺及技术特点.以烃基酸酐与多烯多胺和几种醇胺化合物的混合反应,得到一种乳化效率高、乳化稳定性好的粉状炸药专用乳化剂.     

粉状乳化炸药工艺研究

介绍了粉状乳化炸药的生产工艺及爆炸性能，认为粉状乳化炸药是一种工艺先进、性能优良的新型工业炸药。     

粉状乳化炸药中乳胶基质质量的影响因素分析

通过对粉状乳化炸药质量影响因素的分析,阐述了乳胶基质在保持粉状乳化炸药性能中的重要性,同时对影响乳胶基质的各个因素做出分析与阐述,旨在通过提高乳胶基质质量的基础上保证粉状乳化炸药的性能。     

关于如何提高粉状乳化炸药存储稳定性的研究

粉状乳化炸药是在20世纪90年代出现的一种新型工业炸药,它既有粉状炸药易于储存,又有乳化炸药具较强的爆炸性能的优点。因此,很快它便得到了广泛的使用,但不足的是,这种炸药在使用的过程中容易出现脱壳和缩头的现象,这使得它的性能有所下降。所以如何提高粉状乳化炸药存储的稳定性才是促进其快速发展的关键所在。     

多孔粒状硝酸铵在提高粉状乳化炸药抗结块性中的应用

本文将多孔粒状硝酸铵(LPAN)及经柴油改性的多孔粒状硝酸铵(ANFO)与粉状乳化炸药(PEE)按不同比例混合,测试各样品的抗结块性能及爆炸性能。实验表明,随着多孔粒状硝酸铵添加量的提高,粉状乳化炸药的抗结块性显著增强,当添加量为30%时,粉状乳化炸药的结块现象消失。经柴油改性的多孔粒状硝酸铵与粉状乳化炸药混合后,其抗结块性能增强效果不变,但爆炸性能提高。     

Ⅱ型岩石粉状乳化炸药在质量、节能、安全性方面的探讨

文章分析了Ⅰ型粉状乳化炸药在生产中存在的问题,论述了在工艺、节能降耗、安全性、质量方面的改进,阐述了Ⅱ型粉状乳化炸药在提高产品质量,降低单位能耗,提升生产线本质安全等方面的优越性。     

低梯粉状炸药专用蜡的研制

根据低梯粉状炸药专用蜡的质量指标,以石油蜡副产的含油蜡作为专用蜡的原料,在正交实验的基础上,利用DPS数据处理系统确定出低梯粉状炸药专用蜡的原料配比。在此基础上,加入3％复合剂A配制成低梯粉状炸药专用蜡。工业实验表明,各项指标完全符合低梯粉状炸药要求。利用副产的含油蜡研制低梯粉状炸药专用蜡成本较低,具有较强的市场竞争力,对我国石蜡基原油生产企业具有一定的推广意义。     

抗静电剂PEE的应用工艺优化

由DMT、EG和PEG合成了抗静电剂PEE,并通过正交试验分析得出了抗静电剂PEE对涤纶进行抗静电整理的较优工艺条件。     

泛醇乙醚的生产及应用

泛醇乙醚是泛酸系列产品之一,在国外广泛应用于日化工业的个人洗护用品,在日本甚至用于毛发再生药品,但国内应用还处于起步阶段。作者介绍了泛醇乙醚国内外生产及应用情况,并分析了国内应用前景。     

热塑性聚醚酯弹性纤维

热塑性聚醚酯弹性纤维是热塑性弹性纤维的一种。文中介绍了热塑性聚醚酯的合成及其弹性纤维的熔融纺丝加工 ,对热塑性聚醚酯弹性纤维结构与性能 ,如 Tg、Tm、弹性回复等关系进行了综述。     

聚苯硫醚/热致性液晶聚芳酯的流变性及其纤维的性能研究

将自制热致性液晶聚芳酯(PEE)与聚苯硫醚(PPS)共混,通过熔融纺丝制备了PPS/PEE纤维。采用高压毛细管流变仪研究了PPS/PEE共混物的流变行为,利用扫描电子显微镜观察了PPS/PEE纤维的形态结构,通过差示扫描量热仪、热重分析仪、X射线衍射仪等表征了PEE的含量对PPS/PEE纤维热性能及结晶行为的影响。结果表明:PEE的加入大幅度降低了PPS树脂的表观黏度,减小了其对剪切速率的敏感性,提高了PPS基体的结晶速率,加快了其结晶过程,在一定程度上提高了PPS纤维的热稳定性;PEE在共混纤维中起到异相成核剂的作用,对PPS的晶型没有影响;PEE与PPS相容性较差,PEE以大尺寸微纤的形式分布于基体中。     

聚醚酯弹性纤维的改性研究

和丙三醇(GL),制备了改性聚醚酯弹性体,经熔融纺丝得到聚醚酯弹性纤维,讨论了TiO_2和GL对弹性纤维性能的影响。结果表明:0.4%～0.8%mol GL的加入和0.5%(w)TiO_2的加入都能提高聚醚酯弹性纤维的弹性回复率。GL的加入还使拉伸断裂强度和模量增加。与未改性聚醚酯弹性纤维相比,两种改性弹性纤维的声速和声速模量随拉伸倍数的增加而幅度下降。     

Rheological and thermal properties of binary blends of polypropylene and poly(ethylene‐CO‐1‐octene)

Dynamic viscoelastic properties of binary blends consisting of an isotactic polypropylene (i‐PP) and ethylene‐1‐octene copolymer (PEE) were investigated to reveal the relation between miscibility in the molten state and the morphology in the solid state. In this study, PEE with 24 wt % of 1‐octene was employed. The PEE/PP blend with high PEE contents showed two separate glass‐relaxation processes associated with those of the pure components. These findings indicate that the blend presents a two‐phase morphology in the solid state as well as in the molten state. The PEE/PP blend with low PEE content showed a single glass‐relaxation process, indicating that PEE molecules were probably incorporated in the amorphous region of i‐PP in the solid state. The DMTA analysis showed that the blends with low PEE contents presented only one dispersion peak, indicating a certain degree of miscibility between the components of these blends. These results are in accordance with the results of the rheological analysis. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1634–1639, 2001     

Rheological,mechanical, thermal,and morphological properties of polypropylene/ethylene‐octene copolymer blends

Rheological and morphological studies were performed on polymer blends of ethylene‐octene copolymer [polyethylene elastomer (PEE)] and polypropylene (PP). The viscosities of PEE, PP, and PEE/PP blends were analyzed using an Instron capillary rheometer and a Rheometrics Dynamic Stress Rheometer, SR 200. A non‐Newtonian flow behavior was observed in all samples in the shear rate range from 27 to 2700 s⁻¹, whereas at shear rates in the range from 0.01 to 0.04 s⁻¹, a Newtonian flow behavior was verified. The scanning electron micrographs showed that dual‐phase continuity may occur between 50 and 60 (wt %) of PEE. This result is consistent with the Sperling's model. The mechanical analysis showed that PEE/PP, with 5 wt % of PEE, presented an increase on the mechanical properties and as the PEE content increased, a negative deviation in relation to an empirical equation was observed. Thermal analysis showed that there were no change in the crystallization behavior of the matrix when different elastomer contents were added. Dynamic mechanical thermal analysis showed that samples with low PEE contents presented only one peak, indicating a certain degree of miscibility between the components of these blends. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 692–704, 2000     

全面工程教育和片面工程教育的区别

全面工程教育和片面工程教育的区别,在于前者主要是面向市场经济,后者主要是为计划经济服务。前者培养的是学生集体,这个集体由各类充分发展的个体所组成。后者培养的是片面划一的个体。本文详细阐述了在大学和大学科技园体制建设上,全面工程教育应如何区别于片面工程教育。     

不同杂种松产脂力及松脂成分的变异研究

为了研究不同杂种松的产脂力及松脂成分的差异,对21年生湿地松（PEE）与加勒比松（PCH和PCB）的5个不同杂种的产脂力、松脂成分进行方差分析与相关分析。结果表明：杂交松及其对照样的产脂力差异显著,其中3个杂种（PEE×PCH、PCH×PEE、PEE×PCB、（PCH×PEE）×PEE、PCH×（PCH×PEE））产脂力分别比3个对照样（PEE、PCH和PCB）均值高74.55%、23.27%、37.19%、65.26%、46.71%,其中PEE×PCH杂种产脂力表现最优;杂种及其对照仅松脂含油量、β-蒎烯、柠檬烯、左旋海松酸、去氢枞酸、新枞酸差异显著。松脂含油量、单萜中α-蒎烯、β-蒎烯含量最高的杂种分别为PEE×PCH（31.02%）、PEE×PCB（23.24%）、PEE×PCH（14.70%）;左旋海松酸、去氢枞酸、新枞酸含量最高杂种分别为PEE×PCH（28.38%）、PCH×（PCH×PEE）（4.34%）、（PCH×PEE）×PEE（11.46%）。PEE×PCH杂种产脂力与松脂性状的相关分析表明,产脂力与松脂性状相关性不显著,含油量、β-蒎烯、柠檬烯、左旋海松酸之间的某种或某几种存在相关性。     

Metallization of cross-linked polyurethane resins by reduction of polymer-incorporated metal ion

Polyurethane (PU) resins having different degree of cross-linking were prepared by the reaction of 4,4′-methylenebis(phenyl isocyanate) (MDI) with various molar ratio of two kind of pentaerythritol ethoxylates (PEE15, ratio of ethyleneoxy (EO) unit/hydroxyl (OH) unit=15/4; PEE3, EO/OH=3/4) in the presence of cobalt(II) chloride at 100 °C for 48 h. Metallization behavior of the CoCl₂-containing PU resins by reduction with aqueous sodium tetrahydroborate solution was investigated by means of infra-red (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). It was confirmed by the measurement of degree of swelling and glass transition temperature that the PU resin having a higher molar ratio of PEE15/PEE3 has a lower degree of cross-linking. When the PU films were reduced at 20 °C, the PU resins with PEE15/PEE3=10/0, 8/2, and 6/4 afforded the films with a metallic luster, whose surface resistance increased in this order. The formation of cobalt metal on both the sides of the PU film was revealed from the results of the XPS and EPMA measurements. The PU resin having a lower degree of cross-linking could be more easily metallized by this reduction treatment.