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本文应用了核磁共振方法研究了XNa2O.(1-X)V2O5玻璃的结构。结果表明,X≤0.25时,玻璃由V2O5和NaV3O8结构单元组成;0.25≤X≤0.05时,由NaV3O8和NaVO3结构单元组成;X>0.50时,由NaVO3和Na3VO4结构单元组成。 相似文献
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苏北某立窑企业面对高硅低钙石灰石(SiO_2≥9.0%;CaO≤45.0%)通过改善生料易烧性和成球塑性入手,成功生产出合格的熟料(fCaO<2.5%;3d抗压30MPa,28d抗压55MPa左右)。具体措施:①采用“二高一中”配料(KH=0.88±0.02;n=2.3±0.1,P=1.5±0.1);②适当提高熟料热耗(配热为5022kJ/kg熟料);③采用萤石磷酸渣复合矿化剂(F/s=0.46,F/Al=0.11,P_2O_5=0.3%);④尽量提高粘土用量(从1.5%提高到5.0%);⑤严控出磨生料细度(0.08mm筛余<8.0%;0.2mm筛余<0.5%)。 相似文献
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以三聚氰氯和烯丙醇为原料,在强碱性条件下,以苯为反应介质,经缩合反应合成了TAC。其最佳工艺条件:反应温度5~10℃;反应时间2.5h;原料配比氢氧化钠:三聚氰氯=3.3:l(mo1),烯丙醇:三聚氰氯=3.45:l(mo1);产品收率93.0%,含量≥98.5%。 相似文献
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21世纪技术——热塑性弹性体 总被引:2,自引:0,他引:2
在橡胶、弹性体领域的21世纪技术可举出纳米复合材料和热塑性弹性体(TPE)作为例子。热塑性弹性体诞生于40年前.它有5种特征:(1)本身具有补强性;(2)不需要硫化工序;(3)配合简单;(4)具有处于交联橡胶与塑料之间的中间物性;(5)可以进行材料回收再利用。另外,热塑性弹性体引人注目的有3个方面:(1)加工工序简单.节能;(2)生产工艺合理,生产率高.成本低;(3)废物回收再利用的可能性大。 相似文献
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化学生物絮凝工艺处理城市污水的试验研究 总被引:14,自引:1,他引:14
试验采用化学生物絮凝工艺处理上海市低浓度城市污水,分析不同聚合氯化铝铁(PAFC)投加量条件下的污染物去除效果.探讨化学生物絮凝工艺的反应实质。平行对比试验结果显示:化学生物絮凝工艺是一种化学和生物协同作用深度集成的污水强化一级处理工艺,在相同加药量条件下,该工艺对污染物的去除效果显著优于化学强化一级处理工艺;在总水力停留时间2h,污泥回流比33%,聚丙烯酰胺(PAM)投加质量浓度0.5mg/L,化学生物絮凝池各廊道的DO值分别为1.9.3.2mg/L、1.3~2.5mg/L和0.3-1.5mg/L的条件下,液体PAFC投加质量浓度为70mg/L(Al2O3 10.8%.Fe2O31.8%)时,化学生物絮凝工艺的出水CODcrTP、SS和NH3浓度满足城市污水综合排放二级标准。 相似文献
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脂肪酸甲酯乙氧基化物在洗衣粉中的应用 总被引:4,自引:0,他引:4
对脂肪酸甲酯乙氧基化物(MEE)在洗衣粉体系中等量代替AEO9进行了应用研究,在洗衣粉前、后配料工艺中加入不同量的MEE或AEO9情况下,综合考察了熔点、黏度、洗衣粉去污性能。CMEE-8、AEO9熔点分别为25℃、21℃,黏度完全相同,后配料工艺制备的洗衣粉去污力基本相当;前配料工艺中CMEE-8与AEO9在质量分数为1.5%、3%、6%、10%时所配洗衣粉料浆黏度的比值分别为1/3.2、1/4.8、1/5.1、1/1.8,洗衣粉去污力基本相当。研究结果表明:CMEE-8无论在前配料、后配料中均可以代替AEO9。 相似文献
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Ethylene‐vinyl acetate copolymer (EVA) was melt‐mixed with multiwalled carbon nanotubes (MWCNTs) and organoclays, and the effects of simultaneous use of organoclays and MWCNTs on the surface resistivity and tensile properties of EVA nanocomposites were investigated. The surface resistivity of EVA/MWCNT nanocomposite with 1 phr of MWCNT is out of our measurement range (above 1012 Ω/square). With increasing content of organoclay from 0 to 3 phr, the surface resistivity of the EVA/MWCNT/organoclay nanocomposites with 1 phr MWCNT remains out of our measurement range. However, the surface resistivity of the nanocomposite decreases to 106 Ω/square with addition of 5 phr organoclay. The tensile properties of EVA/MWCNT/organoclay nanocomposites with 1 phr MWCNT and 5 phr organocaly are similar to those of EVA/MWCNT nanocomposites with 5 phr MWCNT except tensile modulus. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers 相似文献
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以SBS弹性体为基料,以增粘树脂为改性剂,配以合适的混合溶剂制备出一种环保型SBS万能胶。研究了不同类型的SBS弹性体、增粘树脂和环保型溶剂的选择与配比对SBS万能胶性能的影响,并确定了万能胶的最佳配方。结果表明,当w(SBS弹性体)=13份[其中m(YH-796)∶m(YH-801)=6∶7]、w(萜烯树脂)=10份、w(C9石油树脂)=6.7份、w(脂松香)=6.7份、w(264防老剂)=1份、w(乙酸乙酯)=9.6份、w(乙酸丁酯)=1份、w(环保溶剂油)=52份时,所得万能胶的剪切强度为1.6MPa、开放时间为60min、25℃时粘度为350mPa·s且抗冻性能合格,该万能胶完全符合相关标准要求。 相似文献
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The effects of additives in various vegetable oils on the physical, mechanical, and adhesion properties of carbon black/rubber compounds were studied. Various doses of castor oil and some other oils such as paraffin oil, vegetable oil 1, and cashew nut shell liquid (CNSL) at a fixed dose (1 phr) were used. With an increase in the castor oil content, the modulus, tear strength, and tensile strength increased, whereas the hardness and adhesive strength exhibited little variation up to 1 phr. Beyond 1 phr castor oil, the modulus, tear strength, and hardness decreased, whereas the adhesive and tensile strengths increased up to 2.5–3 phr and then decreased. Therefore, castor oil seemed to behave as a coupling agent up to 1 phr and as a coupling agent and a plasticizer in the range of 1–3 phr; beyond that, the main role of castor oil was plasticization. When various oils at a fixed dose (1 phr) were compared, it was found that the vegetable oils exhibited enhanced properties in comparison with those of paraffin oil. In addition, both of the unsaturated oils (castor oil and vegetable oil 1) enhanced physical and mechanical properties in comparison with saturated paraffin oil. CNSL exhibited the best adhesion properties against mild steel and galvanized iron substrates. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1574–1578, 2003 相似文献
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Ming Yi Wang Nan Qiao Zhou Sheng Ping Wen 《Polymer-Plastics Technology and Engineering》2013,52(3):303-309
This study examined the effects of concentrations of modifying agent (ACR), plasticizer (DOP) and vibration on cell morphology of the formed polyvinylchloride plastics. Cell morphologies were compared over the range of 2 to 6 phr of ACR and 0 to 10 phr of DOP, when other components of the formulation are the same. The following conclusions were reached: (1) ACR was most effective in improving cell morphology of the formed polyvinylchloride plastics when concentration was 4 phr; (2) DOP was most effective in improving cell morphology of the formed polyvinylchloride plastics over the range of 2 to 6 phr; and (3) Vibration was effective in improving cell morphology. 相似文献
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通过热压发泡实验考察了软化剂、发泡剂、助发泡剂对高密度聚乙烯(PE-HD)/天然纤维缓冲包装材料性能的影响,并对PE-HD/天然纤维缓冲材料的微观结构、形貌状态、密度和力学性能进行了研究,得到了最佳配比,即PE-HD为100份、天然纤维60份、灰石粉40份、发泡剂15份、助发泡剂15份、增塑剂8份、软化剂63份,并测得材料的最佳缓冲系数为1.16。 相似文献