On line Measurement of the Concentration of Strong Acid by Using Ultrasonic Velocity;
用声速法在线测量强酸溶液的浓度
Through several methods of mixing aramid fiber,corona treatment,coupling agent treatment and strong acid treatment,the improvement of bonding strength between PBO fiber and epoxy resin as well as interlaminar shear strength were examined.
对PBO纤维表面性能的改善进行了研究,考察了混杂芳纶纤维、电晕处理、偶联剂处理及强酸处理等多种方法对PBO纤维与环氧树脂表面粘接强度及其复合材料层间剪切性能的影响程度,比较了各种方法的改性效果及各自优缺点。
The influence of the molar ratio of formaldehyde to urea on free formaldehyde content (FFC) was studied in strong acid and weak acid.
在强酸和弱酸性条件下 ,就甲醛与尿素的量比对游离甲醛含量的影响进行了试验 ,得到了强酸下低游离甲醛含量脲醛树脂胶粘剂 (UFRA)合成的最佳甲醛与尿素的量比 ;合成出了具有 3,5二氮杂 -二氢 - 1,4砒喃酮 (URON)结构、低毒的UFRA 。
Study on the Catalytic Aldol Condensation by Superacid and Its Solvent Effection;
固体超强酸催化下的醛酮自身缩合及其溶剂效应的研究
The structural characterization of SO_4~(2-)/ZrO_2 solid superacid catalyst;
SO_4~(2-)Z/rO_2固体超强酸催化剂的结构表征
Preparation of solid superacid CH_3SO_3~-/TiO_2 and its application;
MSA~-/TiO_2超强酸的制备及其应用
Preparation of strong acidity mesoporous crystalline zeolites;
强酸性介孔晶体分子筛的制备
Urea-formaldehyde resin with low toxicity and cost was obtained by using a technology of strong acidity-weak acidity-weak alkalescence.
采用强酸-弱酸-弱碱的合成工艺,通过加大催化剂的用量,分批缓慢加入尿素,提高强酸性介质缩聚时反应物料的摩尔比,使缩聚反应得以在中低温条件下平稳地进行,并添加少量聚乙烯醇作改性剂,制备出了低毒低成本脲醛树脂胶,达到了既节约能源、降低毒性又能提高树脂综合性能的目的。
The character of nitric's molecular structure determines that it can separate completely in solution, so the nitric has strong acidity;according to its standard potential electrode,the teacher and students can judge it can be oxidized.
硝酸的分子结构特征,决定了硝酸在水溶液中能完全电离,所以硝酸具有强酸性,根据硝酸的标准电极电势,师生可推断出硝酸又具有氧化性。