Corrosion inhibitors and corrosion inhibitor compositions, and preparation methods thereof, application of corrosion inhibitors and corrosion inhibitor compositions to inhibition of aqueous corrosion, and treating method for circulating water
A technology of corrosion inhibitor and composition, applied to corrosion inhibitor, application of the aforementioned corrosion inhibitor or the aforementioned corrosion inhibitor composition in inhibiting water corrosion, corrosion inhibitor composition, treatment of circulating water, aforementioned corrosion inhibitor In the field of agent preparation, it can solve the problems of unfavorable cooling water circulation and other problems, and achieve the effect of not being easily used by microorganisms, good corrosion inhibition effect, and long-lasting drug effect
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[0037] At the same time, the present invention also provides a method for preparing a corrosion inhibitor, which includes: under condensation reaction conditions, in the presence of a catalyst, the aliphatic hydroxycarboxylic acid and / or its salt and alcohol amine in water Contact to form the corrosion inhibitor; wherein the aliphatic hydroxycarboxylic acid has the structure shown in the following formula I; the alcoholamine has the structure shown in the following formula II,
[0038]
[0039] In the formula I, R 1 Is H or OH, R 2 Is H or COOH, R 3 Is COOH, CH 2 -COOH or In the formula II, R 4 And Rˊ 4 Same or different, and are independently selected from H and R 5 Is H or CH 3 , N is an integer from 1 to 4. In the formula III, R 6 Is H or CH 3 , R 7 For CH 3 Or CH 2 CH 3 .
[0040] The preparation method of the corrosion inhibitor provided by the present invention promotes the condensation reaction of aliphatic hydroxycarboxylic acid and / or its salt and the alcohol amine with ...
Example Embodiment
[0077] Preparation Example 1
[0078] Add 32.7 g (0.15 mol) of sodium gluconate (0.15 mol), 14.9 g (0.1 mol) of triethanolamine and 100 ml of water into a four-necked flask equipped with a stirrer, distillation device and thermometer. Start stirring to fully dissolve the sodium gluconate and triethanolamine. mixing. Add 5g of concentrated sulfuric acid (containing H) at room temperature (20℃) 2 SO 4 , 0.05mol). The heating bath (heating medium is dimethyl silicone oil) containing the aforementioned flask is heated to 130°C, reacted for 6 hours, the amount of distilled water is 40g, and the remaining liquid in the flask is cooled to obtain a phosphorus-free corrosion inhibitor. This product is recorded as S1, the solid content of the corrosion inhibitor S1 is determined to be 39.9% by weight, and the molecular weight distribution of the condensation reaction product in the corrosion inhibitor S1 is determined to be in the range of 327-683.
Example Embodiment
[0079] Preparation example 2-5
[0080] Preparation method of phosphorus-free corrosion inhibitor: Refer to the preparation method of phosphorus-free corrosion inhibitor in Preparation Example 1, the difference is shown in the following table:
[0081] Preparation example
[0082] The non-phosphorus corrosion inhibitor prepared in Preparation Example 2-5 is designated as S2-S5.
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