西秦岭李子园碎石子斑岩型金矿床地质特征及成矿时代

西秦岭李子园碎石子金矿床受闪长玢岩脉和断裂破碎带的双重控制,矿体上部主要产于闪长玢岩脉附近的断裂破碎带中,矿体下部产于闪长玢岩脉内部;矿石中金属矿物主要为黄铁矿、黄铜矿、方铅矿;黄铁矿为主要的金、银的载体矿物,矿石以细脉-浸染状、细脉-网脉状构造为主,具有斑岩型矿床的蚀变类型特点.矿区与成矿有关的正长斑岩和闪长玢岩的锆...     

附加压力棒曲线牵伸上销对成纱质量的影响

探讨细纱牵伸后区附加压力棒的新型曲线牵伸上销对成纱质量的影响情况.分析了目前细纱机牵伸的主要形式、普通上销存在的问题及曲线牵伸上销的工作原理.将曲线牵伸上销与普通上销在环锭纺、紧密纺上纺制CJ 14.5 tex纱,测试对比了成纱条干、毛羽和强伸性能.结果表明:曲线牵伸上销依靠张力调节装置和压力棒作用,可以降低成纱条干CV,减少成纱毛羽,改善强伸性能.     

磷酸三苯酯/热塑性酚醛树脂在PC中协效阻燃作用的研究

采用磷酸三苯酯(TPP)和热塑性酚醛树脂(PF-T)复配阻燃聚碳酸酯(PC),探讨了TPP/PF-T不同配比以及阻燃剂添加总量变化对整个体系的阻燃性能及力学性能的影响。结果表明,当PC/TPP/PF-T质量比为80/10/10时,体系的氧指数达到46%,阻燃级别达到UL94V-0级;TPP/PF-T的协效作用机理为热解过程中PF-T与TPP发生酯交换反应而形成稳定的网状结构,抑制了TPP的挥发,提高了体系的热稳定性及阻燃性能。     

Variation on anthracite combustion efficiency with CeO2 and Fe2O3 addition by Differential Thermal Analysis (DTA)

Effects of CeO₂ and Fe₂O₃ on anthracite combustion efficiency were investigated using differential thermal analysis (DTA). Based on heat release (Q_D) of anthracite as well as anthracite with CeO₂ and anthracite with Fe₂O₃ additions against α-Al₂O₃ in DTA experiment, effects of additives CeO₂ and Fe₂O₃ on anthracite combustion efficiency were evaluated. Under the same experimental conditions, heat releases of raw anthracite, anthracite with CeO₂ and anthracite with Fe₂O₃ were 11.04 kJ/g, 11.30 kJ/g and 11.42 kJ/g, respectively, indicating that anthracite combustion efficiency was improved by addition of CeO₂ and Fe₂O₃. To confirm the above results, carbon transfer was monitored using Thermogravimetric analysis Fourier transform infrared (TGA-FTIR) and Carbon-Sulfur analyzer during catalytic combustion process. The results indicated that CO₂ emission was increased, whereas CO emission and residual carbon of ash were decreased, being in accordance with the results of DTA. Finally, according to analyses of ignition temperature and catalytic combustion process, the possible mechanism of catalytic combustion of anthracite was proposed.     

织物结构参数对热传递性能影响的模拟分析

为方便快捷构建出接近三原组织织物真实结构的三维几何模型,应用图像处理技术对织物截面提取特征点,基于Newton插值公式拟合纱线中心线方程进而建立织物模型,而后在有限元软件中设置材料取向、定义边界条件,对三原组织织物的热传递性能进行数值模拟,通过实验验证了有限元方法及模型的有效性。之后预测了织物紧度对织物热传递性能的影响。结果表明:在相同织物紧度的条件下,平纹织物的热传递性能最好,其次是斜纹织物,最后是缎纹织物;在一定范围内,随着织物紧度的增加,织物的导热性能逐渐增加。     

细特棉大麻混纺紧密竹节纱的试制

为试制细特棉大麻混纺紧密竹节纱,选用棉大麻混纺粗纱,在紧密纺改造的细纱机上采用竹节纱装置,试制出了棉/大麻65/35 9.7 tex混纺紧密竹节纱,并对影响成纱质量的捻度和紧密纺负压值两项工艺参数进行了试验优选.结果得出对于节长5 cm,竹粗200%,基纱长度11 cm,平均号数为9.7 tex的棉大麻紧密竹节纱,较优的工艺参数为捻度1 217.9捻/m,负压2 400 Pa.     

集聚区牵伸倍数对紧密纱质量的影响

为了探讨紧密纺集聚区牵伸倍数对成纱质量的影响,在自行改造的EJM128K-SM型细纱机上进行了纺纱试验.集聚区牵伸倍数采用1.03倍～1.10倍,测试了CJ 14.6 tex紧密纱的毛羽、强伸性能及条干均匀度指标.结果表明:集聚区牵伸倍数对成纱质量有影响,随着集聚区牵伸倍数增大,紧密纱毛羽增多;集聚区牵伸倍数过大或过小,紧密纱断裂强力、强力CV、断裂伸长率等强伸性能指标较差,成纱条干均匀度也会有轻微的恶化.综合分析,纺CJ 14.6 tex紧密纱,集聚区牵伸倍数以1.05倍为宜.     

几种差别化聚酯纤维的结构与性能

为更好地了解新型差别化聚酯纤维的结构与性能,为后续产品开发提供参考,选取聚对苯二甲酸乙二醇酯(PET)、聚对苯二甲酸丙二醇酯(PTT)、低黏度PET/高收缩PET复合纤维(SPH)、PET/PTT双组分复合弹性纤维(T400)4种差别化聚酯纤维,借助扫描电子显微镜、傅里叶红外光谱仪、X射线衍射仪、超景深三维数码显微镜、热性能分析仪等对纤维的结构与性能进行测试与分析。结果表明:SPH、T400纤维表面有沟槽,可以产生毛细效应;SPH经拉伸或热处理后可产生纤维的自卷曲效应;T400纤维卷曲收缩率大,断裂强度高,弹性回复性好;PET断裂强度高,可以做仿蚕丝产品;PTT分子结构具有独特的奇碳效应,使其纤维具有较高回弹性及弹性回复性。     

磷酸丙烯酸酯共聚改性苯丙乳液的研究

采用预乳化工艺,半连续种子聚合法,通过磷酸丙烯酸酯(P-A)、甲基丙烯酸甲酯(MMA)、苯乙烯(St)、丙烯酸丁酯(BA)、丙烯酸(AA)共聚反应制得具有高附着力的改性笨-丙乳液.结果表明,当磷酸丙烯酸酯在乳液聚合中占单体总量的5%时,乳液涂膜在铝板、镀锌板、马口铁、ABS、PVC、玻璃板等基材上的附着力从3～5级提高到0～1级,在玻璃上的硬度从H提高到2H,耐水性从12 h提高到192 h,同时对乳液的聚合稳定性、Ca2 稳定性都有一定的改善.     

In-situ synthesis of NaP zeolite doped with transition metals using fly ash

Here, a novel approach has been proposed to synthesize NaP zeolite adsorbents doped with transition metals (M-NaP) using the Na₂SiO₃ and NaAlO₂ compounds extracted from fly ash via activation and stage treatment. The preparation process of M-NaP employed the in-situ synthesis in combination with organic complexation method. The effects of the addition amounts and valence state of transition metals on the zeolite products were investigated. The crystalline phase, morphology, and particle size of M-NaP were characterized using X-ray diffractometry (XRD), Scanning electron microscopy (SEM), and Laser particle size analyzer (PSD). The doping process was investigated using X-ray photoelectron spectroscopy (XPS) and Materials Studio. The adsorption performance of M-NaP was tested by the adsorption of Zn²⁺. The optimal molar ratio of n(Al₂O₃)/n(M) was identified as 8:1 for Co–NaP, Ni–NaP, and Fe–NaP, compared with 6:1 for Ti–NaP. The influence of transition metals on adsorption was: Co–NaP > Ni–NaP > Ti–NaP > Fe-NaP. Due to largest surface area of Co–NaP (162.5 m²/g, five times than that of NaP-RAW), the maximum removal rate of Zn²⁺ was above 99.50% at 25°C. The existence state of transition metals in M-NaP primarily included: isomorphous substitution and balance of the skeletal charge, with the latter in majority. The simulation of Materials Studio indicates that Si at T4 was first substituted and then, Si at T3 opposite T4 was replaced when the replacement of Si in different sites occurred.