A facile method for preparation of PGS@ZB‐N and gas‐sol alternating synergistic effect for fire resistance of EVA

Through the simple precipitation of palygorskite (PGS) by zinc borate (ZB) (to make PGS@ZB) and the decoration of PGS@ZB by dodecylamine (N), a novel organic‐inorganic@inorganic hybrid flame retardant of PGS@ZB‐N was prepared and was incorporated with ethylene vinyl acetate copolymer (EVA) to improve its flame retardance. The structure and morphology of PGS@ZB‐N were characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), and scanning electron microscopy (SEM), and it was confirmed that the PGS@ZB‐N hybrid had been successfully prepared. The flame retardancy and burning behavior of EVA/PGS@ZB‐N/EG (EG = expandable graphite) composite were studied through thermogravimetric analysis (TGA), limiting oxygen index (LOI), UL‐94 (by the vertical burning test), and cone calorimeter test (CCT) characterizations. The prepared EVA/PGS@ZB‐N/EG composite obtained an LOI value of 41.2% with the addition of 30 wt% PGS@ZB‐N/EG. It was found that EVA/PGS@ZB‐N/EG was protected through a gas phase and condensed phase alternating synergistic effect mechanism.     

Growth behavior of aluminum borate whiskers on zirconia toughened alumina (ZTA) particle surface

In this work, B₄C-covered zirconia-toughened alumina (ZTA) particles are prepared and oxidised at 1050 °C for different times (0, 2, 4, and 8 h) in air. The X-ray diffraction and electron probe micro-analysis results show that the covering layer is mainly composed of oxide B₂O₃ intermetallics, residual B₄C particles, and Al₁₈B₄O₃₃ whiskers. The scanning electron microscopy results show that the growth of Al₁₈B₄O₃₃ whiskers on the ZTA particles enhances with increasing heat preservation time; the optimum holding time is determined to be 8 h Al₂O₃ in the ZTA particles diffuse into the covering layer and combine with B₂O₃ to form Al₁₈B₄O₃₃ whiskers; the Al₁₈B₄O₃₃ whiskers grow via the liquid-solid mechanism.     

低品位硼矿的富集加工技术

报道了青海大柴旦地区低品位硼矿富集加工的新工艺，该工艺使硼矿品位30％－35％，B2O3收率大于80％，该工艺路线已工业化。     

硼酸铝晶须增强环氧树脂和双马来酰亚胺树脂体系的研究

本文以硼酸铝晶须为增强剂，以4，5-环氧环己烷-1，2-二甲酸二缩水甘油酯(TDE-85)，甲基纳狄克酸酐(MNA)、N，N’-二胺基二苯甲烷型双马来酰亚胺(BMI)/O，O′-二烯丙基双酚A(BA)体系分别作为基体制备晶须增强复合材料。研究了晶须对树脂的尺寸、表面处理方法、含量对树脂体系力学性能和热性能的影响；通过扫描电子显微镜(SEM)分析了浇注体的弯曲、冲击断口，研究晶须的增强机理。     

纳米碳酸钙/炭黑并用对丁苯橡胶性能的影响

研究了纳米碳酸钙／N330炭黑并用比对丁苯橡胶性能的影响。结果表明，随着CaCO3／N330并用比的改变，材料的强度有了显著的提高，特别是CaCOa／N330并用比为20／30(质量份)时复合材料的拉伸强度达到了20MPa以上，同时材料具有较好的弹性和较低的硬度；两种处理剂相比，树脂酸处理的碳酸钙具有较好的性能；表面处理的纳米炭酸钙与炭黑并用，可以降低炭黑填充橡胶的动态滞后，表面处理的纳米碳酸钙的加工性能比纳米炭黑好，可以通过并用纳米碳酸钙来改善炭黑胶料的加工性能。     

基于动态硼酸酯键改性黄原胶的性能

基于苯硼酸聚合物可以与存在于黄原胶糖环单元结构中的伯、仲醇羟基通过硼酸酯键形成动态共价微交联结构的性质对黄原胶进行改性。以偶氮二异丁基脒二盐酸盐（AIBA）为引发剂，通过水相自由基聚合，制备了不同共聚比的丙烯酰胺（AM）、N-(3-二甲氨基丙基)丙烯酰胺（DMAPAM）和3-丙烯酰胺基苯硼酸（AMBB）的三元共聚物P(AM-co-DMAPAM-co-AMBB)。通过1H NMR、FTIR、元素分析和光散射对聚合物结构及相对分子质量进行了表征，并对其与黄原胶复配体系的增黏性、流变性、抗老化性及抗干扰性进行了评价。结果表明：P(AM-co-DMAPAM-co-AMBB)与黄原胶复配后对黄原胶溶液具有明显的增黏性，其中苯硼酸单体的摩尔比为1.0 mol%的聚合物对黄原胶溶液的增黏幅度达43.8%，在8074 mg/L的矿化水中增黏幅度高达56.4%，且复配体系具有良好的抗老化降解性，对乙二醇和1,3-丙二醇具有较强的抗干扰性。     

水热法解聚钠硼解石制备硼酸钙

以钠硼解石天然矿粉为原料，经水热解聚和相转化制备出硼酸钙产品。通过化学分析、XRD及TG—DTG分析表明：产品中的物相主要是白硼钙石（4CaO·5B2O3-7H2O）、硬硼钙石（2CaO·3B2O3·5H2O）和羟硼钙石（3CaO·2B2O3·9H2O）。实验确定了适宜的工艺条件，即：反应体系液固体积质量比为2．5mL／g左右；解聚温度120℃；解聚时间8h左右；干燥温度在200℃左右。在此工艺条件下制得的硼酸钙产品的氧化钠质量分数在0．5％以下，很好地满足了无碱玻璃纤维工业对含硼原料的要求。     

硼及硼酸盐产品开发和应用前景

论述了硼及硼酸盐在现代无机盐工业中的地位和作用,以及在国民经济各部门、工农业生产、国防工业以及高新技术领域的应用。结合国内外硼化物的发展趋势,并根据中国的实际情况提出了当前应开发和发展的硼、硼酸盐及含硼新型材料有:纤维复合材料、元素硼粉和同位素系列产品、硼金属化物(如硼化钙、硼化锆、硼化钛)和含硼非晶态金属材料、有机硼化物(硼酸酯、烷基硼)、氟硼酸盐、硼酸钙、硼酸锌、硼酸镁和硼酸铝晶须材料。     

Soy protein combined with copper and boron compounds for providing effective wood preservation

Chromated copper arsenate (CCA), an arsenicbased wood preservative, is toxic to human health and the environment. Although CCA is stable in seasoned wood, there are potential dangers during CCA manufacture, lumber treatment, and waste disposal. This research was conducted to study the effectiveness of soy products to replace toxic chromium and arsenic compounds in wood preservative formulations. Three soy product (Arpro 2100, HM 90, and Supro 760) were used as fixative agents in preservative solutions containing anhydrous CuSO₄ and Na₂B₄O₇·10H₂O. The decay resistance of treated wood blocks was measured by a soil-block culture method. Despite the large molecular sizes of copper-protein and copper-boron-protein complexes, southern pine sapwood was treatable with these preservative formulations. Wood samples treated with >6 kg°m⁻³ CuSO₄ and 7.5 kg·m⁻³ soy product, and subsequently leached for 3 d and exposed to the decay fungus Gloeophyllum trabeum (Fr.) Mur., sustained only 0.5% weight loss over 12 wk. Wood samples needed 40 kg·m⁻³ CuSO₄ and 50 kg·m⁻³ soy protein to resist the copper-tolerant decay fungus Postia placenta (Fr.) M. Lars. & Lomb. These results suggest that soy-based wood preservatives can prevent wood products from fungal attack and can replace CCA.     

硼酸镁晶须的合成研究

报道了硼酸镁晶须的合成研究结果。硼酸镁晶须是一种性能价格比高的晶须产品，利用熔盐法合成出长10—50μm、直径0．5—2μm的硼酸镁晶须。还就硼酸镁晶须增强复合材料的研究和硼酸镁晶须工业化的前景作了展望。