查询词典 tin

Polylactide/ nano-silica composites were synthesized with lactide and modified nano-silica by tin octoate catalyst.

以丙交酯和改性后的纳米二氧化硅为原料，在辛酸亚锡催化作用下，制备了聚乳酸纳米二氧化硅复合材料。

By use of titration analysis, the thesis investigated various factors such as isocyanate, PE molecular weight, reacting substance molecular ratio, reacting temperature and time etc. influencing upon prepolymerization step. It was found that 2, 4-tolulene diisocyanate and 4, 4'diphenylmethane diisocyanate is more rapidly reacted with PE600 than HDI. With PE molecular weight increasing, the reacting temperature or time should be raised or extended relevantly. Thus PE2000+2HDI pre-polymerization should be better carried out under some catalyst, for example, Triethylene diamine , Dibutyltin dilaurate and Tin octoate were used.

首先采用滴定分析方法对WRPU预聚反应的影响因素进行了研究：芳香族二异氰酸酯TDI、MDI比脂肪族二异氰酸酯HDI反应活性高，其中TDI在反应初始阶段的反应速率比MDI快，不过随着反应的进行，MDI比TDI反应速率加快，这主要是因为TDI分子中的两个-NCO反应活性差异大所致；二元醇分子量越大，反应速度越慢；聚醚二元醇比聚酯二元醇的反应速度快；当分子量超过2000的二元醇与HDI进行预聚反应时，需借助适当的催化剂来加快反应速度，从而使预聚反应能够顺利进行，分别选择DABCO、TOA和DBDTL三种催化剂进行催化反应，发现不同的催化剂，其催化效果相差较大。

Science and technology are primary productive forces" is our business policy, the company is committed to new product research and development, and with the Ministry of Chemical Industry, Changzhou Chemical Research Institute, Shanghai Jiao Tong University and other famous institutions, will be the development of environmentally friendly plastic Plasticizer , octyl tin and so on."

&科学技术是第一生产力&是公司秉承的经营方针，公司致力于新产品的开发研究，且与化工部常州化工研究院、上海交大等知名院校合作，将先后开发环保类塑料增塑剂、辛基锡等。

In the fender was a battered tin oilstove, a saucepan, and two cups, provided by Mr Charrington

围栏里有只破烂铁皮煤油炉，一只平底锅，两个茶杯，都是查林顿先生备下的。

"Tin bonds with carbon to form organotin compounds, used to stabilize PVC and in biocides and fungicides."

锡与碳的键合形成有机锡化合物，用于稳定PVC材料，还用在杀虫剂和杀真菌剂中。

Objective To determine the contents of tin in seafood from the 5 sea areas of Shenzhen and to provide baseline data of organotin pollution.

目的 测定深圳海域海产品中总锡含量，以初步探明深圳海域海产品有机锡的污染状况。

Maoming City is rich in mineral resources with nearly hundreds of minerals and 27 proved reserves. Of them, oil shale and kaolin boast the most reserves in the country; quality and reserves of rare earth and orthophyre tin ore also play an important role in the country; jade mine, which called "the jade in the South", is one of the three biggest jade mines in our country.

茂名市矿藏丰富，各种矿物近百种，已探明储量的有27种，油母叶岩、高岭土储量名列全国之冠；稀土、斑岩型锡矿的质量和储量也在全国占有一席之地；有&南方碧玉&之称的玉石矿是我国三大玉矿之一。

Surface treatment process are: HAL, the entire plate electroless nickel gold, Gold Finger, lead-free HASL, chemical plated / silver / tin, Anti-oxidation treatment and so on, there is conductive in accordance with the requirements of customers Cypriot hole, peelable plastic, conductive plastic and a variety of models and the photosensitive ink color.

表面处理工艺有：热风整、全板电镀镍金、金手指、无铅喷锡、化学镀金／银／锡、防氧化处理等，有根据客户要求的导电塞孔、可剥胶、导电胶和各种型号及颜色的感光油墨。

The combination of chemicals includes a catalyst, such as, dibutyl tin dilaurate; carboxylic or sulfonic acid; and an extender compound, such as 2,4 pentanedione.

该化学试剂混合物包括催化剂，如二月桂酸二丁基锡；羧酸或磺酸；和增量化合物，如2，4－戊二酮。

Taking the volcanic-intrusive complex in the Yanbei porphyry tin oredistrict as an example and based on the covariance plots of Ce,Nd,Sm,Eu,Yb in six different elemont-element,ratio-ratio coordinates,the authors havereestablished the petrogenic mechanism of the volcanic-intrusive complex inthis district.

以岩背斑岩锡矿区火山侵入杂岩为例，根据稀土元素Ce，Nd，Eu，Yb等5种元素6种不同式样协变关系（元素－元素，比值－比值）的判别，重建了本区火山侵入杂岩成岩机制。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。