Iron rust conversion agent and preparation method thereof
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A conversion agent and rust technology, applied in the coating process of metal materials, etc., can solve problems such as uneven coating, poor rust conversion ability, powdering, etc.
Inactive Publication Date: 2013-06-26
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0004] At present, there are two main types of rust converters, namely, tannic acid type, such as EXITRUST in Australia, and phosphoric acid type, such as KO-99 in the United States. The former can only be used under the condition of a very uniform rust layer, while the latter is prone to rust Whitening, pulverization, etc.
Australia's Krasmer Company has developed a phosphoric acid-type rust conversion agent, which is composed of liquid and solid phases...
Method used
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Embodiment 1
[0010] Preparation of component 1: Weigh 25.5kg of styrene, 20kg of butyl acrylate, and 1.5kg of methacrylic acid, put them into the reaction kettle, add 0.13kg of OP-10 emulsifier, 0.3kg of sodium lauryl sulfate, N - 1.5 kg of methylol acrylamide, 1 kg of ammonium persulfate, 30 kg of deionized water, and stirred for 20 minutes to prepare a pre-emulsion. Add 40kg of water into a three-port reaction kettle with a dropping funnel, reflux condenser, and electric stirrer, put it in a water bath and heat it. When the temperature is 80°C, add 0.4kg of OP-10 emulsifier, dodecyl 0.2kg of sodium sulfate and 0.2kg of ammonium persulfate were stirred and reacted for about 25 minutes. When the temperature of the base material is raised to 85°C, the pre-emulsion is added dropwise. The speed of the dropwise addition is slow at first and then fast. The drop is completed within 30 minutes, and the heat preservation reaction is 1-1.5h. Cool to 40°C and discharge.
[0011] Preparation of Com...
Embodiment 2
[0014] The preparation of component one is the same as in embodiment one.
[0015] Preparation of Component 2: At room temperature, add 8 kg of distilled water and 8 kg of absolute ethanol to a reaction kettle with a stirring device, start stirring, add 2.5 kg of pyrogallic acid and 1 kg of tannic acid in sequence until completely dissolved, and stir State, continue to add 2kg citric acid, 1kg isopropanol until completely dissolved.
[0016] Preparation of rust conversion agent: accurately weigh 70kg of component 1, add 4.9kg of film-forming aids, stir well, add 25kg of component 1, 0.1kg of simethicone, and stir for 20min until the system is uniform.
Embodiment 3
[0018] The preparation of component one is the same as in embodiment one.
[0019] Preparation of Component 2: At room temperature, add 6kg of distilled water and 6kg of absolute ethanol to a reaction kettle with a stirring device, start stirring, add 1kg of pyrogallic acid and 2.5kg of tannic acid in sequence until completely dissolved, and stir State, continue to add 1.5kg citric acid, 1.5kg isopropanol until fully dissolved.
[0020] Preparation of rust conversion agent: accurately weigh 63kg of component 1, add 5.3kg of film-forming aid, and stir well, then add 31.5kg of component 1 and 0.2kg of simethicone, and stir for 20 minutes until the system is uniform.
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Abstract
The invention relates to an iron rust conversion agent for removing and preventing rust on the surface of steel. The iron rust conversion agent can be coated on a rusty surface of the steel, the iron rust is conversed into a layer of a protective film, the complicated components of the rust layer are converted into stable products, and the stable products show no rust in the relatively long time in the atmosphere, therefore, the rusty surface of the steel can be directly coated and constructed without removing the rust. A synthetic resin emulsion is used as a main film-forming agent, pyrogallic acid and tannic acid are used as main conversion agents, citric acid is used as an auxiliary conversion agent, and a film-forming auxiliary agent is adopted to realize the curing film-forming at room temperature, thus the compactness and water resistance of the film are improved; and moreover, isopropyl alcohol is used as a solvent and penetrating agent, so as to stabilize the rusty layer. The iron rust conversion agent is sprayed to the rusty surface of the steel, thus a compact and uniform black film is formed on the surface of the steel in short time. In addition, the iron rust conversion agent has advantages of simple preparation process, low cost, stable performance, economy and practicality, safety and environmental friendliness, not containing of toxic and harmful ingredients such as formaldehyde, benzene and nitrite, and no simulation on operating personnel and the like.
Description
technical field [0001] The invention relates to a preparation method of an iron rust conversion agent, which can be applied to the rusted steel surface and can be directly applied without derusting the substrate. The invention belongs to the technical field of steel surface anticorrosion coating. Background technique [0002] Corrosion of steel brings huge losses to the national economy. In order to protect steel components from rust, coating methods are often used. Before using the paint, a thorough derusting treatment must be carried out to remove the rust, scale and other sundries on the steel surface, so that the steel surface is clean and has a certain roughness, so as to ensure a good bonding force between the covering layer and the substrate. Otherwise, the anti-corrosion effect of the paint film will be poor due to the continuous expansion of rust, even if the best anti-corrosion coating is used, it will not be able to play its role. An example has been reported a...
Claims
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Application Information
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