1.It is stated that the Andrensen equation fits for the particle size distribution (PSD) of a dense package powder and the Rosin-Rammler-Bennett equation fits for the PSD of an actual cement powder, respectively.
粉体的最紧密堆积要求其粒径分布服从Andrensen方程,而实际水泥粉体的粒径分布则服从Rosin-Rammler-Bennet方程。
2.In the presence of alkaline soap as emulsifier and catalyst, hydrogenated rosin sucrose esters (HRSE) were synthesized by transesterification reaction of hydrogenated rosin ethyl ester and sucrose under the conditions of (125±1)℃,molar ratio of hydrogenated rosin ethyl ester to sucrose 1 ∶1, pressure 0.090 MPa without solvent.
以碱性皂为乳化剂和催化剂,在(125±1)℃、反应物料物质的量之比1∶1,真空度0.090MPa及无溶剂的条件下,通过氢化松香乙酯与蔗糖的酯交换反应合成了氢化松香蔗糖酯(HRSE)。
3.In order to provide an intermediate used in synthesizing hydrogenated rosin sucrose esters, hydrogenated rosin ethyl esters were prepared by direct esterification reaction of hydrogenated rosin with ethanol under solvent-free condition and in the presence of DRC as catalyst.
本文以DRC为催化剂,在无溶剂条件下通过氢化松香与乙醇的直接酯化反应制备氢化松香乙酯,作为进一步合成氢化松香蔗糖酯的中间体。
4.Abstract: The development on research of catalytic esterification of rosin in the past 30 years are summarized.Conditions and catalysts used in the reaction are specially noted and compared.It is pointed out that enforcement of such researches on rosin esterification is helpful for better utilization of rosin resources in China.Fifty-two references are cited.
文摘:综述了30年来松香催化酯化反应的研究进展，重点考察了反应使用的催化剂、反应条件以及产品性能，对进一步研究松香酯化改性具有指导意义，并有利于我国松香资源的充分利用。
5.The development on research of catalytic esterification of rosin in the past 30 years are summarized.Conditions and catalysts used in the reaction are specially noted and compared.It is pointed out that enforcement of such researches on rosin esterification is helpful for better utilization of rosin resources in China.Fifty-two references are cited.
综述了30年来松香催化酯化反应的研究进展，重点考察了反应使用的催化剂、反应条件以及产品性能，对进一步研究松香酯化改性具有指导意义，并有利于我国松香资源的充分利用。
6.Violinists and violists need a more dry or hard rosin, cellists a medium and double bassists a more sticky rosin in general.
一般小提琴，中提琴用较干/硬的松香，大提用中等硬度的，贝大用较粘的松香。
7.Disproportionated rosin is a modified form of "rosin, widely employed for the production of synthetic rubbers. Its high acid value and other undesirable properties prohibit its direct use in coating fields. The present communication described the preparation of esters of disproportionated resin based on glycidyl ether, which can be used extensively in the manufacture of paints, varnishes, lacquers and other miscellaneous, applications. These esters were further evaluated by preparing styrenated alkyd resins.
由于酸价高以及其他不理想的性能,歧化松香在涂料领域中的直接使用受到阻碍。 本文介绍了以缩水甘油醚为基础制备歧化松香树脂的方法,所制成的树脂可以广泛使用于制油漆、清漆、天然漆以及其它各种用途。
8.Pentaerythritol ester of gum rosin are made from gum rosin through esterification with pentaerythritol light color stabilizing process etc. used in adhesives,rubber products.
松香季戊四醇酯为松香经脱色、酯化和稳定化等工艺研制而成；应用于粘合剂、橡胶行业。
9.Resin acid is the main component of rosin, the quality of the disproportionated rosin is dependent on the amount of resin acid. The {}+1H NMR, 13 C NMR ,DEPT(θ=3/4π) spectra of abietic acid, neoabietic acid, levopimaric acid, pulustic acid and dehydroabietic acid have been determined. We also have assigned all peaks in the spectra by HMQC and HMBC coherenec spectra.
树脂酸是松香的主要成分，歧化松香质量的好坏，主要取决于树脂酸的组分及其含量．本文测定了五种树脂酸———枞酸、新枞酸、左旋海松酸、长叶松酸和脱氢枞酸的1 H、13C、DEPT 谱．并通过二维HMQC 以及HMBC相关谱和模型化合物分别对其谱图的归属进行了详细的探讨
10.Dry rosin is best in tropic and soft rosin in cold climate.
干的松香在热带最适用，而软的松香适用于寒冷的气候。
