渗透型混凝土硅烷防护膏体的研制
发布时间：2018-12-11 13:12
【摘要】：混凝土因其优越的性能和低廉的价格而得到广泛应用，但同时其易受到外界污染物质的侵入而受到腐蚀，因此混凝土的防护成为人们研究的热点。与其他防护涂料相比，硅烷防护剂因其具有一定的渗透性、防水效果好、防护时间长而倍受青睐。本文简单介绍了有机硅防护剂的防护原理及发展现状，以及针对目前国内硅烷生产产率低下、环境污染严重、易挥发等问题，本文进行了一定的研究，主要的研究内容如下： （1）根据反应特征，选取并制备适当的催化剂。研究结果表明：使用均相铂配体催化剂能有效促进反应的进行，并且催化选择性好、成本低、反应易于实现工业化。实验制备了五种均相铂配体催化剂。 （2）以烯烃和TES为原料，在自制铂催化剂的催化下，采用硅氢加成的方法合成得到硅烷，以解决其生产过程污染严重的问题。并以葵基三乙氧基硅烷合成为例，对生产工艺进行了探讨。研究表明：以Pt-乙烯基双封头为催化剂、以Pt计，n(Pt)/n(TES)=12.0×10-6、原料配比n(C10)/n(TES)=0.95、O2作为助催化剂，在110℃下反应4h，能得到产率为97.15%的葵基三乙氧基硅烷，且生产成本最低。 （3）采用外加乳化剂的办法对自制的硅烷进行乳化，，制备了10种渗透型硅烷防护膏体，并以葵基三乙氧基硅烷膏体的制备为例，对乳化工艺进行了研究。结果表明：以Gransurf61和Gransurf71等质量复配而成的复配乳化剂用量为4.0%，所制备得到的葵基三乙氧基硅烷膏体粒径分布均匀，蒸发率最低，稳定性最好。其在50℃下能保存10天，室温下有40天以上的保存期。 （4）对所制备的硅烷膏体进行了接触角、吸水率和渗透深度分析，结果表明：经过10种硅烷膏体产品防护的混凝土其表面与水的接触角都大于129.7°、吸水率降低量大于91.53%、渗透深度大于3.0mm，满足防护要求；且复合型硅烷防护膏体的综合防护性能最好；涂布次数的增加有利于提高混凝土的防护效果。
[Abstract]:Concrete is widely used because of its superior performance and low price, but at the same time, it is easy to be corroded by external pollutants. Therefore, the protection of concrete has become a hot research topic. Compared with other protective coatings, silane protectors are favored for their permeability, waterproof effect and long protective time. In this paper, the protection principle and development status of silicone protectants are briefly introduced, and some problems, such as low production rate of silane, serious environmental pollution, easy volatilization and so on, are studied in this paper. The main contents are as follows: (1) according to the characteristics of the reaction, appropriate catalysts were selected and prepared. The results show that the use of homogeneous platinum ligand catalyst can effectively promote the reaction, and the catalytic selectivity is good, the cost is low, and the reaction is easy to realize industrialization. Five kinds of homogeneous platinum ligand catalysts were prepared. (2) Silane was synthesized from olefin and TES by hydrosilylation under the catalysis of self-made platinum catalyst, so as to solve the problem of serious pollution in the production process. The synthetic process of sunflower triethoxy silane was discussed. The results showed that Pt- vinyl double capping was used as catalyst, n (Pt) / n (TES) = 12.0 脳 10 ~ (-6) for Pt, n (C _ (10) / n (TES) = 0.95O _ 2 as co-catalyst at 110 鈩
本文编号：2372610
[Abstract]:Concrete is widely used because of its superior performance and low price, but at the same time, it is easy to be corroded by external pollutants. Therefore, the protection of concrete has become a hot research topic. Compared with other protective coatings, silane protectors are favored for their permeability, waterproof effect and long protective time. In this paper, the protection principle and development status of silicone protectants are briefly introduced, and some problems, such as low production rate of silane, serious environmental pollution, easy volatilization and so on, are studied in this paper. The main contents are as follows: (1) according to the characteristics of the reaction, appropriate catalysts were selected and prepared. The results show that the use of homogeneous platinum ligand catalyst can effectively promote the reaction, and the catalytic selectivity is good, the cost is low, and the reaction is easy to realize industrialization. Five kinds of homogeneous platinum ligand catalysts were prepared. (2) Silane was synthesized from olefin and TES by hydrosilylation under the catalysis of self-made platinum catalyst, so as to solve the problem of serious pollution in the production process. The synthetic process of sunflower triethoxy silane was discussed. The results showed that Pt- vinyl double capping was used as catalyst, n (Pt) / n (TES) = 12.0 脳 10 ~ (-6) for Pt, n (C _ (10) / n (TES) = 0.95O _ 2 as co-catalyst at 110 鈩
本文编号：2372610
本文链接：https://www.wllwen.com/guanlilunwen/chengjian/2372610.html
