Nitrogen-containing organic phosphorous acid corrosion inhibitor and synthesis method thereof
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A technology of organic phosphorous acid and synthesis method, applied in the field of corrosion inhibition of metal materials
Active Publication Date: 2017-12-15
GUANGDONG UNIV OF PETROCHEMICAL TECH
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The compound has a double-hydrophilic configuration, which contains amino groups and phosphorous
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Embodiment 1
[0021] Example 1 ((((4,6-diamino-1,3,5-triazin-2-yl)amino)methyl)phosphorous acid
[0022] Fully mix 1 part of melamine, 1 part of hypophosphorous acid, 40 parts of water, and 2 parts of 20% sulfuric acid, gradually add formaldehyde dropwise when the reaction temperature reaches 80 °C, react for 4 hours, separate solid and liquid, recrystallize, and dry in vacuum, that is The corresponding aminoorganophosphorous acid was obtained with a yield of 57.3%.
Embodiment 2
[0023] Example 2 ((((4,6-diamino-1,3,5-triazin-2-yl)amino)butyl)phosphorous acid
[0024] Fully mix 1 part of melamine, 1 part of hypophosphorous acid, 40 parts of water, and 2 parts of 20% sulfuric acid, gradually add butyraldehyde dropwise when the reaction temperature reaches 80°C, react for 4 hours, separate solid and liquid, recrystallize, and dry in vacuum. That is, the corresponding aminoorganophosphorous acid was obtained with a yield of 32.1%.
Embodiment 3
[0025] Example 3 ((((4,6-diamino-1,3,5-triazin-2-yl)amino)(2-furyl)methyl)phosphorous acid
[0026] Fully mix 1 part of melamine, 1 part of hypophosphorous acid, 40 parts of water, and 2 parts of 20% sulfuric acid, gradually add furfural dropwise when the reaction temperature reaches 80°C, react for 4 hours, separate solid and liquid, recrystallize, and dry in vacuum. The corresponding aminoorganophosphorous acid was obtained with a yield of 25.6%.
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Abstract
The invention discloses a nitrogen-containing organic phosphorous acid corrosion inhibitor and a synthesis method thereof. The structural formula of the nitrogen-containing organic phosphorous acid corrosion inhibitor is shown by the formula I and the formula II; and the synthesis method of this type of compound comprises the following steps that aldehyde/ketone, melamine, hypophosphorous acid and hypophosphite are subjected to Mancini reaction to produce corresponding nitrogen-containing organic phosphonic acid, nitrogen-containing organic phosphonic acid is used as the acid corrosion inhibitor of carbon steel, galvanized steel and stainless steel, the dosage is 20-500 mg/L, the pH value of a corrosive medium is 0-7, the using temperature is 10-280DEG C, and metal materials can be protected effectively. The synthesis method of the nitrogen-containing organic phosphorous acid corrosion inhibitor has the following advantages that raw materials are easy to get, the price is low, the reaction condition is mild, the synthetic path is short, and the affect on environmental ecology is small.
Description
technical field [0001] The invention relates to a novel nitrogen-containing organic phosphorous acid compound used as an acidic corrosion inhibitor for carbon steel, galvanized steel and stainless steel and a synthesis method thereof, belonging to the field of corrosion inhibition of metal materials. Background technique [0002] Metal corrosion is widespread in nature, including chemical corrosion and electrochemical corrosion. The hazards include greatly reducing the life, performance and quality of the material. Therefore, metal anti-corrosion has received great attention in industries such as chemical industry, petroleum, transportation, storage, and mining. Corrosion inhibitors can effectively regulate the metal surface and play a role in corrosion protection, and are the core of the development of the field of corrosion inhibition of metal materials. The development of low-cost, mild reaction conditions, short synthetic routes, and low-toxic or non-toxic corrosion in...
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