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研究偶联剂Si69用量对多相炭黑G10填充半钢轮胎胎面胶性能的影响,并与炭黑及炭黑/白炭黑并用填充胎面胶性能进行对比。结果表明:与炭黑填充胶料相比,炭黑/白炭黑并用填充胶料的门尼粘度较大,t90延长,t10缩短;与炭黑/白炭黑并用填充胶料相比,多相炭黑G10填充胶料的门尼粘度明显减小,t90缩短,混炼胶的Payne效应明显减弱,硫化胶的拉伸强度增大,阿克隆磨耗量和DIN磨耗量减小,压缩生热明显降低,混炼胶中炭黑分散性明显改善;随着多相炭黑G10填充胶料中偶联剂Si69用量的增大,胶料硫化特性和物理性能变化不大,损耗因子减小,其中偶联剂Si69用量为白炭黑用量8%的胶料生热较低,多相炭黑G10分散效果较好。 相似文献
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采用水分散法制备选择性激光烧结用聚丙烯(PP)粉末,使用普朗尼克(F108)作为表面活性剂,成功验证了水分散法的可行性。对PP在水中分散效果的若干因素进行了研究,包括表面活性剂的添加量、PP的添加量、成核剂的添加量、PP的熔体流动速率等原料配比因素以及温度、搅拌转速等反应条件的影响。表面活性剂添加量少于10 g则无法得到PP粉末,在表面活性剂添加量为10~60 g范围内,表面活性剂添加量与PP成粉率成正比,表面活性剂添加量为60 g以上时,PP的成粉率变化不大;PP的添加量达到10 g以上时,PP的成粉质量在7 g左右;白炭黑作为成核剂对PP的分散效果影响很大,并且PP的成粉率在白炭黑添加量为0.15 g时达到最大值,为57.6%;PP的熔体流动速率(MFR)与其成粉率成正比,PP的MFR由20 g/(10 min)增加到41.3 g/(10 min)时,PP的成粉率由48.6%增加到56.4%。改变加热温度、降温方式对PP成粉率的影响不大,而搅拌转速对PP分散效果的影响显著,搅拌转速与PP的成粉率成正比,在搅拌转速为1 500 r/min时,PP的成粉率达到最大值,为72.5%。水分散法制备的PP粉末球形度高、表面光滑、流动性好。 相似文献
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沉淀法白炭黑粉体的疏水改性研究 总被引:2,自引:0,他引:2
以甲基含氢硅油为改性剂、二氯甲烷为硅油分散剂,采用干法对沉淀法白炭黑粉体进行表面改性,考察了改性剂用量和分散剂用量对改性效果的影响,并通过正交试验优化了工艺条件。试验结果表明,改性后沉淀法生产的白炭黑疏水性明显提高。其最佳工艺条件为:取8 g未改性的沉淀法白炭黑、甲基含氢硅油用量0.6 g、硅油分散剂用量2.4 g、恒温温度120℃、恒温成膜时间30 min,改性产物活化度达到96%以上。由红外光谱分析可知甲基含氢硅油成功键合到白炭黑表面,通过白炭黑疏水性试验及白炭黑粉体在水—油体系中的分散试验,结果证实改性后的白炭黑具有良好的疏水亲油性。 相似文献
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造纸用阳离子分散松香胶的制备 总被引:10,自引:0,他引:10
对低速常压逆转乳化法制备造纸用阳离子分散松香乳液的条件进行探讨,并对所得的产品性能及施胶效果进行测定。最适宜的乳化条件为:乳化剂用量为松香用量的10%、助乳化剂用量为松香用量的25%,乳化温度为150~160℃、转相温度为100℃;在乳液制备初期搅拌速度为150~200r/min为宜,加入热水后搅拌速度为2000r/min,转相后搅拌速度为100r/min。施胶度(cobb值)为23·45g/m2。 相似文献
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气相法白炭黑补强加成型RTV硅橡胶的研究 总被引:3,自引:0,他引:3
采用气相法白炭黑作补强剂填充加成型RTV硅橡胶,研究了白炭黑含量对硅橡胶黏度、力学性能、介电性能以及硫化时间的影响,并通过SEM考察了白炭黑在硅橡胶中的分散效果.结果表明,白炭黑能显著地增强硅橡胶的力学性能,当白炭黑用量为5%时,硅橡胶的拉伸强度提高了近4倍,其综合力学性能达到最佳,同时能使硅橡胶具有更低的介电常数,且介电损耗变化不大. 相似文献
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Deshang Han Yi Pan Junxiu Xue Benhui Yu Gang Yan Chuansheng Wang Kongshuo Wang Yiren Pan 《应用聚合物科学杂志》2021,138(47):51408
The function of silane coupling agent in rubber mixing field is to combine inorganic matrix with rubber organic matrix. Silica is commonly used in the rubber mixing field to strengthen rubber. The size and amount of silica aggregates in the mixing process are important factors affecting the wear of the mixing chamber. The wear of the mixing chamber would lead to a increasing gap between the mixer chamber and the rotor, which caused the mixing efficiency reducing. It also affected the dispersion effect, then affected the mechanical and physical properties of the vulcanized rubber. In this paper, the effects of rubber compound on metal friction and wear were studied by using four silane coupling agents commonly used in rubber mixing field. The experiment was carried out at 15°C, and the attention should be paid to drying during sample preparation to avoid the deviation of the experiment caused by hydrolysis of silane coupling agent. The results showed that silanization reaction occured between silica and silane coupling agent in the mixing process. The mixing temperature was usually maintained at 145 to 155°C for 1 min in the mixer, and the silanization reaction rate was the fastest during this time. We took this rubber compound as the research object and studied the friction and wear of the rubber compound on the mixing chamber in the mixing process. The products of the silylation reaction are alcohol and water. This paper studies the corrosion and abrasion of the mixing chamber by water at high temperatures. In the mixing process, abrasive wear was the main wear form, but the corrosion wear caused by high temperature steam still occupied a large proportion. 相似文献
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将廉价的硅酸钠作为硅源生产二氧化硅微球有着重要的意义。以硅酸钠为硅源,聚乙二醇(PEG)为结构导向剂,在超声波辅助下,成功合成出高分散的二氧化硅微球。探索了PEG及超声波对产物形貌的影响,讨论了反应温度、pH、PEG相对分子质量与产物粒径的关系。结果表明,PEG能够引导产物成球,超声波可以提高产物的分散性,升高温度及pH会降低产物粒径,增加PEG的相对分子质量会提升产物粒径。当控制温度为40 ℃、pH为3.5、聚乙二醇相对分子质量为2 000时,所得的产品分散性较好,粒径为6.34 μm。 相似文献
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Deshang Han Shoufeng Zhang Kongshuo Wang Yi Pan Donglin Zhu Chuansheng Wang Yiren Pan 《应用聚合物科学杂志》2021,138(31):50761
Prolonged operations of mixers cause wear of mixer rotors and chamber walls and affect the clearances between the rotors and chamber walls, which reduce the mixing effect, weaken the dispersion of the packing, and affect the quality of rubber products. In this study, the effects of traditional mixing and wet mixing on the friction and wear of the chamber, and the properties of rubber were compared by using 60 phr of a silica natural rubber formulation system. The results show that a silanization reaction occurs between silica and the silane coupling agent during the mixing process and that the reaction rate is fastest when the temperature of the mixing chamber is maintained between 145 and 155°C for 1 min during the mixing process. The products of silanization reaction are ethanol and water; the water vapor that forms at high temperatures corrodes the mixing chamber of the internal mixer and aggravates wear and tear. Due to the high dispersion of silica during wet mixing, the silanization reaction is more complete and water vapor is produced at a high temperature. Hence, the rubber compound obtained by wet mixing has more significant wear on the mixing chamber. 相似文献
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研制了一种纳米TiO2水性浆料。研究了钛酸酯偶联剂、分散剂、pH、有机膨润土以及分散方法对浆料稳定性的影响。获得了最佳配方:0.12%钛酸酯偶联剂B,0.5%分散剂3275,pH=11,0.5%有机膨润土,分散方法为高速剪切30min 砂磨10h 超声波分散30min。获得了稳定性可达到3个月以上的水性纳米TiO2浆料。紫外加速老化试验表明,当纳米TiO2浆料占清漆的3%时,经过1000h的加速老化实验后,清漆不变色。 相似文献
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钛白初品在水溶剂中的分散性应用研究 总被引:1,自引:0,他引:1
分析了钛白粉体在水中的分散机理,用重力沉降法研究了钛白粉体在水溶液中pH、粉体粒度分布、分散剂种类、分散剂加入数量等因素对钛白粉水分散性的影响。调节钛白浆料的pH在7.0以下,7.0~7.9,8.0~9.0,9.1~11.0,11.0以上这5个范围,得到分散性较好的pH范围在8.0~11.0。通过研究3种钛白粉体粒度对分散性的影响,发现粒度越小,分散性越好。通过研究分散剂六偏磷酸钠、铝酸钠、三羟甲基丙烷、无水乙醇、六偏磷酸钠+聚乙二醇(按体积比为1∶1)、六偏磷酸钠+无水乙醇(按体积比为1∶1)等6种分散剂的分散效果以及最佳分散剂的加入量,得出六偏磷酸钠+无水乙醇(按体积比为1∶1)的分散性最好,其最佳加入量为0.5%(质量分数)。 相似文献
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水性纳米掺锑二氧化锡(ATO)浆料的研制 总被引:3,自引:2,他引:1
采用硅烷偶联剂对纳米掺锑二氧化锡(ATO)粒子表面进行化学改性,以分散剂对其进行物理包覆,调节分散工艺、体系黏度和pH,获得了稳定性可达到两个月以上的水性纳米ATO浆料.傅立叶红外光谱分析表明,硅烷偶联剂可以有效地包裹在纳米粒子表面.当采用硅烷偶联剂KH570,其用量为纳米ATO粒子质量的1.5%时,包覆效果最好;选用嵌段型分散剂3275,其用量为体系质量的0.2%时,分散效果最好;当体系黏度大于88 mPa·s和pH=10时,浆料稳定性最好.透射电子显微镜观测表明,纳米ATO粒子获得了良好分散. 相似文献