Synthesis And Properties Of The New Organic Silicate Inhibitor Studies

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 LSecond, synthesize polv ether-bearing organ di-silane.Conditions:temperature:120 0C;proportionofy-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.