取代剂

It can directly replace the traditional oil soluble antirust with lower cost and easy operation, no need to built complicated water-treatment system

节省投资：取代传统的油漆型防锈剂，物美价廉，使用方便，不需另外再建造复杂的水处理系统。

It is prepared from pentachluorobenzonitrile by using KF as fluoride to substitute chlorine in the presence of benzonitrile under high temperature. But owing to the low solubility of KF and rigor synthesis condition, and the parallel auxiliary reactions, the speed of reaction as well as the yield is very low.

五氟苯甲腈的合成开发以五氯苯甲腈为原料在较高的温度下用氟化钾做氟化剂，通过取代苯环上氯原子而得到的，由于氟化钾在溶剂中溶解度低，合成条件要求苛刻，反应速度较慢，同时存在有平行竞争副反应，因而反应收率较低，国内尚无厂家生产。

CMC is used as woof trimming agent replacing traditional starch paste material, which can reduce pollution of woof during sizing and desizing. At the same time, CMC can form a membrane on woof which reduces"drop woof"and "decollation" sign.

CMC作为织物的整理剂，用于取代传统的淀粉浆料，大大减少了在织物上浆及退浆中对环境的污染，同时CMC在织物纤维上形成薄膜；而CMC薄膜具有吸湿性，增加了织物的塑性，减少高速织机上"跳纱"、"断头"现象。

Chapter two 4-Hydroxybenzoic acid is connected with PEG6000 through defoliant DCC at rooom temperature, then the product is refluxed with chloroacetic acid in acetone to afford PEG-bound phenyloxyacetic acid, which is reacted with thionyl chloride, ammonium thiocyanate and arylamines in turn to give PEG-bound disubstituded thioureas. After the cleavage with sodium methoxide in methanol, the eleven disubstituted thioureas are obtained.

第二章 利用PEG6000作载体，通过脱水剂DCC在室温下将对羟基苯甲酸以酯键连接在PEG6000上，再与氯乙酸在较温和的条件下生成PEG6000支载的芳氧乙酸，然后，依次与亚硫酰氯、硫氰酸铵、芳胺反应，生成PEG6000支载的硫脲，最后用甲醇钠的甲醇溶液切割PEG，得到了十一种1，3-二取代硫脲。

NXT Generation Spray Wax – This liquid spray on wax is a companion product for Meguiar's NXT Generation of car care products built with ESP's for today's advanced polymer finishes. NXT Spray Wax builds on the results you have already achieved using NXT Tech Wax. NXT Spray Wax is an excellent maintenance product to maintain your protection, in-between regular applications of NXT Tech Wax. This is not a quick detailer and should not be used to remove dirt and dust accumulation. It is also not a replacement for a regular coating of any wax. NXT Spray Wax can be used with all Meguiar's waxes, but chemically works best with NXT Spray Wax.

次世代喷蜡－这瓶液态蜡喷剂是与ESP（工程合成聚合物，使用於目前较先进的聚合物烤漆）一起发展的美克拉次世代汽车保养产品系列中的一个产品，次世代喷蜡的效果取决於你使用次世代科技蜡已经达到的成果，次世代喷蜡是一个出色的保养产品，它可以在你每次施用次世代科技蜡的期间去维持其保护性，它并不是一种快速保养液，所以不应该被使用来移除漆面上累积的脏污和灰尘，它也不是用来取代任何一般的蜡涂层，次世代喷蜡可以与所有的美克拉蜡一起使用，但是与次世代科技蜡搭配使用是最佳的。

Aniline compounds containing heptafluoroisopropyl was synthesized through taking sodium dithionite as evocating agent, and introducing heptafluoroisopropyl by free radical electrophilic substitution on benzene ring.

以连二亚硫酸钠为引发剂，在苯环上通过自由基亲电取代反应引入七氟异丙基，合成了一系列含七氟异丙基的苯胺类衍生物，研究了各种条件对反应的速度和收率的影响。

Meanwhile, the dosages of etherification agent and alkali influencing on degree of substitution and reaction efficiency are discussed.

同时讨论了醚化剂用量和碱的用量对取代度和反应效率的影响，确定了合成阳离子淀粉反应的最佳碱催化剂用量为 1%。

Meanwhile, the dosages of etherification agent and alkali influencing on degree of substitution and reaction efficiency are discussed. The optimal alkali catalyst dosage (1%) is determined in the process of preparing cationic starch.

同时讨论了醚化剂用量和碱的用量对取代度和反应效率的影响，确定了合成阳离子淀粉反应的最佳碱催化剂用量为1%。

Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.

本文以马铃薯淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂对低取代度羟丙基淀粉的制备工艺进行了研究。

And sometimes we hear pronouncements from scientists who confidently state that everything worth knowing will soon be known——or even is already known——and who paint pictures of a Dionysian or Polynesian age in which the zest for intellectual discovery has withered, to be replaced by a kind of subdued languor, the lotus-eaters drinking fermented coconut milk or some other mild hallucinogen.

我们有时听到来自科学家的生命，他们自信的声明所有值得知道的事物迟早会被知道——即使已经知道——他们绘制了狄俄尼索斯时代或波利尼西亚时代的图片，在这些时代中，发现知识的热情消退，转而被征服后的虚弱无力所取代，贪图安逸的人饮取发酵的椰奶或者其他温和的迷幻剂。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。