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1.
有机硅耐磨透明涂料   总被引:13,自引:0,他引:13  
详细总结了构成有机硅耐磨涂料的主要原料,无机溶胶添加剂、溶剂及其他助剂,对兼有防雾性、可染色性、抗静电性、紫外吸收性的耐磨涂料进行了介绍,给出了JD涂覆液的制备及涂层的性能。  相似文献   

2.
有机硅、氟高分子表面活性剂在建材中的应用发展   总被引:5,自引:0,他引:5  
综述了有机硅、含氟高分子表面活性剂及含有机硅氟的高分子表面活性剂的种类和研究进展,介绍了它们在涂料工业、塑料工业等建材领域中的应用。  相似文献   

3.
有机硅耐磨透明涂层的固化分析   总被引:13,自引:0,他引:13  
杨柏  高长有 《应用化学》1994,11(3):54-57
FTIR、TG、TBA等对有机硅耐磨涂料(有机硅溶胶)的热固化过程研究表明有机硅胶体中缔合羟基间的脱水缩合速率很高;羟基脱水程度与固化温度有关,温度越高,达平衡时羟基的浓度越低,在105~130℃间羟基的浓度变化最大,加入适当的固化剂,对羟基的脱水交联有促进作用,在较高的固化温度下,反应体系中出现了环氧环异构化产生的酮羰基的吸收峰  相似文献   

4.
亲水性有机硅杂化防雾涂料的制备及性能   总被引:1,自引:0,他引:1  
采用Sol-Gel技术制备了二乙醇胺/有机硅杂化涂料, 并用FTIR、UV-Vis、AFM、TGA及接触角等测试技术对涂料及其涂层进行了分析表征. 结果表明, 该杂化涂料具有良好的成膜性. 由于膜层中存在大量的亲水性羟基基团, 使膜层具有良好的亲水性能和防雾效果. 固化后的聚合物膜层中无机相形成了三维交联网络, 赋予了膜层优异的耐磨性和热稳定性.  相似文献   

5.
以硅酸盐溶液为主要原料,利用少量自制的含偶联功能基团的有机硅聚合物乳液与硅酸盐进行杂化反应,同时与填料等有效的结合制备了无机硅酸盐涂料,并对涂料的性能进行研究。结果表明:制备的无机硅酸盐涂层具有优异的贮存稳定性、柔韧性、防水性、耐污性、阻燃性以及耐霉菌性等,满足建筑内外墙涂料的相关标准要求。  相似文献   

6.
有机硅建筑材料   总被引:7,自引:1,他引:6  
概述了有机硅在建材工业中作为涂料、助剂、密封胶和防粘剂及防水剂的组成、种类、发展及其应用  相似文献   

7.
研究了聚乙烯醇缩甲醛/有机硅互穿网络防雾涂层的制备和性能,并用FT-IR及TGA对其进行了表征。结果表明,该涂层具有较高的透明性和硬度,较好的防雾性和耐水性。在100℃水中保持1h,涂层不脱落,也不溶胀。  相似文献   

8.
民用飞机内饰涂料通常采用有毒有害的挥发性有机溶剂,既不利于环保,也难以满足民用航空规章的火烟毒标准,本文以溶胶凝胶法制备了水性的有机硅杂化涂料。研究催化剂种类和颜料的配比对有机硅杂化涂料性能的影响,同时引入柔性纳米粒子提高其抗开裂能力。随后通过正交实验确定了影响涂层性能的关键参数配比。据此制备的有机硅杂化涂层硬度可达7H,附着力1级,柔韧性测试能通过1 mm。与基础涂料相比耐磨性能提高62.02%,改性涂料表现出优异的耐磨性能,同时防火性能满足CCAR规章适航要求的60s垂直燃烧和气体毒性测试。为有机硅杂化涂料在民用航空领域的应用提供了理论基础。  相似文献   

9.
有机硅改性丙烯酸酯乳液的合成   总被引:15,自引:0,他引:15  
乳液聚合;涂料;有机硅改性丙烯酸酯乳液的合成  相似文献   

10.
杜作栋等先后合成了四苯基苯基有机硅化合物和五苯基苯基有机硅化合物,并用溶剂沉淀法和重结晶法纯化产物后进行结构分析,在此基础上陈剑华等又合成了双多苯基苯基有机硅化合物,此类化合物具有更好的耐高温性能,可制成耐高温树脂、耐高温橡胶、耐高温粘合剂和耐高温涂料。  相似文献   

11.
In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.  相似文献   

12.
KMnO4-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.  相似文献   

13.
The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.  相似文献   

14.
Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.  相似文献   

15.
An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.  相似文献   

16.
17.
A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.  相似文献   

18.
The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp3)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp2)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp2)?H and aliphatic 1,5- and 1,6-C(sp3)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp3)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp2)?H insertion.  相似文献   

19.
The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.  相似文献   

20.
Quercetin, the polyphenolic compound, which has the highest daily intake, is well known for its protective effects against aging diseases and has received a lot of attention for this reason. Both quercetin 3-O-β-d-glucuronide and quercetin 3′-O-β-d-glucuronide are human metabolites, which, together with their regioisomers, are required for biological as well as physical chemistry studies. We present here a novel synthetic route based on the sequential and selective protections of the hydroxyl functions of quercetin allowing selective glycosylation, followed by TEMPO-mediated oxidation to the glucuronide. This methodology enabled us to synthesize the five O-β-d-glucosides and four O-β-d-glucuronides of quercetin, including the major human metabolite, quercetin 3-O-β-d-glucuronide.  相似文献   

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