摘要
随着世界水资源短缺加剧、水污染日益严重,对工业水处理技术的要求不断提高,促进了水处理剂的迅速发展。当前,新型、高效、不含磷的环保型缓蚀剂已成为人们研究开发的热点。
无机硅酸钠是重要的非磷缓蚀剂之一。它具有效果较好、无污染、易操作等优点,但存在容易形成硅垢的不足,使它的应用受到限制。将无机硅酸盐有机化,既能保持无机硅的缓蚀能力,又克服无机硅易结垢的缺点。
以甲基三乙氧基硅烷、乙烯基三乙氧基硅烷、γ-胺丙基三乙氧基硅烷为主要原料,在40℃~50℃,氢氧化钠水溶液中水解2小时,分别得到甲基硅酸钠、乙烯基硅酸钠、γ-胺丙基硅酸钠。
以γ-胺丙基三乙氧基硅烷和二氯聚醚为主要原料,在120℃,氮气保护下反应4小时,得到聚醚二硅烷。聚醚二硅烷再在温度为70~80℃,氢氧化钠水溶液中水解2小时,得到最终产物——聚醚有机二硅酸钠。
用核磁共振方法对合成的目标化合物进行结构分析。C~(13)NMR结果表明,得到的化合物与所设计化合物的结构相符。
用旋转挂片法对上述四种有机硅化合物的缓蚀性能进行评定。结果表明,有机硅酸盐有一定的缓蚀性能,其中,胺丙基硅酸钠和聚醚有机二硅酸钠的缓蚀效果比硅酸钠好。当50mg/L的聚醚有机二硅酸钠与4mg/L的锌盐复配,复合剂的缓蚀率可达95.5%,远远大于相同条件下无机硅酸盐的缓蚀效果。
用静态阻垢实验方法对所合成的有机硅酸盐的结垢性能进行评
价,结果表明有机硅酸盐自身形成的硅酸盐垢比无机硅酸盐自身形成
的硅酸盐垢量小,其中聚醚有机H硅酸盐的结垢率最小,仅为4.36趴
而相同条件下的硅酸钠为 13.4%。
用电化学方法对所合成的有机硅化合物的缓蚀机理进行研究,极
化曲线显示,有机硅酸盐与无机硅酸盐相同,为典型的抑制阳极型的”
缓蚀剂。
In view of excessive exploration of world wide water resource, serious water pollution and extension of industrial apparatus operating period, cooling water treatment technology is facing a challenge to develop chemicals having high effect against scale and corrosion for cooling water treatment. Accordingly, the goal of this thesis is to synthesize new-functional water treatment chemicals without phosphorus.
Sodium silicate, as a kind of important no-phosphorus corrosion inhibitors, has many advantages such as having no-pollution and not-nutritious for water, easy-operation and so on. But its liable to precipitating to silicon-fouling. In order to overcome this, its necessary to synthesize organ silicones as good corrosion inhibitors.
First, synthesize three compounds: methyl sodium silicate, vinyl sodium silicate, v -aminopropyl sodium silicate. The conditions: soda hydroxide as catalyst; temperature:40-500C; concentration of agent is: O.70-O.8OmolIL; concentration of soda hydroxide is: 1.1O-I.2Omol L
Second, synthesize polv ether-bearing organ di-silane.
Conditions: temperature:120 0C ; proportion of y
-aininopropyl-triethoxy silane and dichloro-polyether: 3:1; reaction time: four hours; protection with nitrogen. Under the temperature 70-800C, hydrolyzed to poly ether-bearing organ di-sodiurn silicate.
All the products were characterized by C13NMR.
Weight-losing corrosion test proved that the new-typed organ silicate showed good effect as corrosion inhibitors. The effect of v -arninopropyl sodium silicate and poly ether-bearing organ di-sodium silicate is better than sodium silicate. Double crossing with 4mg11 Zinc salt, the corrosion-inhibiting rate of poly ether-bearing organ di-sodium silicate in the concentration of SOmg/L is 95. 5%.
By static scale inhibition test, the effect of depositing to silicon-fouling of organ silicate is lower than sodium silicate, poly ether-bearing organ di-sodium silicate is 4. 36%, while sodium silicate is 13.4%.
Preliminary exploration of mechanism proved that, sodium silicate is cathode-controlling corrosion inhibitor; organ silicate is anode-controlling corrosion inhibitor.
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