Treatment fluid for rust prevention of metal surface and preparation method of treatment fluid

Abstract

The invention belongs to the technical field of metal surface rust prevention, and discloses a treating fluid for metal surface rust prevention and a preparation method of the treating fluid. The coating is prepared from components in parts by mass as follows: 5-15 parts of a silane coupling agent, 3-10 parts of nano titanium dioxide, 1-4 parts of benzotriazole, 1-4 parts of molybdate, 1-5 parts of a dispersing agent, 2-6 parts of a coalescing agent, 1-4 parts of a surfactant, 0.5-3 parts of an accelerant, 0.5-3 parts of citric acid, 1-5 parts of acetic acid and 50-80 parts of deionized water. The preparation method comprises the following steps: sequentially adding the components into a stirring processing container according to a certain sequence, and stirring at a certain speed to obtain a treating fluid; according to the technical scheme, through synergistic interaction of all the components, rust can be removed, a layer of compact and continuous protective film can be formed on the metal surface, a very good anti-rust effect is achieved, benzotriazole and molybdate can also form an adsorption film, metal is protected through a large number of films of various types, the anti-corrosion effect of the protective film is improved, and the service life of the protective film is prolonged. The anti-rust effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal surface rust prevention, in particular to a treatment liquid for metal surface rust prevention and a preparation method thereof. Background Art

[0002] In the maintenance of metal surfaces, rust prevention is one of the key tasks. The surface of metal parts is easily corroded during use. It not only damages the appearance, color and mechanical properties of the metal material itself, but also reduces the quality grade of the product, impairs the precision and sensitivity, affects its use and even scraps it. Therefore, rust prevention of metal surfaces is particularly important. At present, the main method for preventing rust on metal surfaces is to spray anti-rust treatment liquid on the metal surface. However, the metal surface anti-rust treatment liquid currently used on the market contains a large amount of industrial hydrochloric acid. Since hydrochloric acid is a strong acid, it is easy to cause over-corrosion of the metal surface during use. It is also easy to volatilize and is accompanied by a pungent odor, which is harmful to the human body and pollutes the environment. At the same time, the anti-rust effect is not ideal, and the anti-rust time for the metal surface is limited. The principle of the treatment liquid to play an anti-rust role is basically to form a protective film on the metal surface through the raw materials in the rust inhibitor. The corrosion resistance of the protective film formed by the currently used rust inhibitor is still poor, which also leads to the problems of poor and unsatisfactory anti-rust effect of the treatment liquid, and is relatively inconvenient to use. Summary of the Invention

[0003] The present invention is intended to provide a treatment liquid for rust prevention of metal surfaces and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: A treatment liquid for preventing rust on metal surfaces comprises the following components, measured by mass: 5-15 parts of a silane coupling agent, 3-10 parts of nano-titanium dioxide, 1-4 parts of benzotriazole, 1-4 parts of molybdate, 1-5 parts of a dispersant, 2-6 parts of a film-forming aid, 1-4 parts of a surfactant, 0.5-3 parts of an accelerator, 0.5-3 parts of citric acid, 1-5 parts of acetic acid, and 50-80 parts of deionized water.

[0005] Preferably, the silane coupling agent is one of γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane and γ-glycidoxypropylmethyldimethoxysilane.

[0006] Preferably, the dispersant is sodium polyacrylate or sodium hexametaphosphate.

[0007] Preferably, the film-forming aid is propylene glycol phenyl ether or dipropylene glycol butyl ether.

[0008] Preferably, the surfactant is sodium dodecylbenzenesulfonate or Tween-80.

[0009] Preferably, the accelerator is stannous chloride or manganese sulfate.

[0010] A method for preparing a treatment liquid for preventing rust on metal surfaces, characterized in that it comprises the following steps: S1. Prepare raw materials according to the above mass components; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 300 rpm to 400 rpm, add citric acid and acetic acid while stirring, and continue stirring for 20-30 minutes to obtain a first mixed solution; S3, adding dispersant, nano-titanium dioxide, benzotriazole and molybdate to the first mixed solution, continuing stirring at the stirring speed in S1 for 40-80 minutes, then slowly adding silane coupling agent, surfactant and accelerator, increasing the stirring speed and continuing stirring for 25-35 minutes to obtain a second mixed solution; S4. Add a film-forming aid to the second mixed solution, continue stirring for 10-20 minutes to obtain a preliminary treatment solution, and filter the preliminary treatment solution to obtain a treatment solution.

[0011] Preferably, in S3, after adding the silane coupling agent, surfactant and accelerator, the stirring speed is increased to 700 r / min-800 r / min.

[0012] Compared with the existing technology, this technical solution has the following beneficial effects: (1) The treatment liquid provided by this technical solution optimizes and limits the raw materials and components. Through the synergistic enhancement between the various components, it can react with rust, oxides, etc. on the metal surface to remove the rust and oxides, avoid further corrosion of the metal, and play a role in rust removal and rust prevention. Through the silane coupling agent, nano-titanium dioxide can form a dense, continuous and well-adhesive protective film on the metal surface, avoiding the metal from contacting with external oxygen, moisture, etc., and achieving a good rust prevention effect. Benzotriazole and molybdate can also form adsorption films, and protect the metal through a large number of various types of films, thereby improving the anti-corrosion effect of the protective film, greatly improving the anti-rust effect, and reducing the number of rust prevention maintenance on the metal surface. Through the use of film-forming additives, the various components of the treatment liquid can form a uniform film on the metal surface, further improving the anti-rust effect.

[0013] (2) The treatment liquid provided by this technical solution does not contain harmful substances, is environmentally friendly and non-toxic, has no irritating odor, does not cause harm to the human body, and can better protect the environment; the overall preparation method is simple, the raw material cost and processing cost are low, and it is convenient for large-scale industrial processing and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The flow chart of the preparation method provided by the present application is shown in the figure; Figure 2 The metal rusting condition record table used by the plurality of embodiments provided by the present application; DETAILED DESCRIPTION The present application will be further described in detail below in combination with the drawings and embodiments: A treatment liquid for metal surface rust prevention, characterized by comprising the following components in parts by mass: silane coupling agent 5-15 parts, nano titanium dioxide 3-10 parts, benzotriazole 1-4 parts, molybdate 1-4 parts, dispersing agent 1-5 parts, film forming aid 2-6 parts, surfactant 1-4 parts, accelerator 0.5-3 parts, citric acid 0.5-3 parts, acetic acid 1-5 parts, and deionized water 50-80 parts.

[0015] The silane coupling agent is one of γ-aminopropyl triethoxysilane, γ-methacryloyloxypropyl trimethoxysilane and γ-glycidyl ether oxypropyl methyl dimethoxysilane; The silane coupling agent can react with the hydroxyl group on the metal surface to form a chemical bond, and at the same time, the silane coupling agent can also undergo polycondensation reaction, forming an organic silicon film on the metal surface. The nano titanium dioxide has good chemical stability and high dispersibility, and can fill the voids in the film formed by the reaction of the silane coupling agent, forming a dense composite protective film and improving the rust prevention effect on the metal; The acetic acid can react with the oxides on the metal surface to reduce and dissolve the oxides, and the citric acid can also react with the oxides on the metal surface. The combination of the components can better remove the oxides on the metal surface and improve the rust prevention effect.

[0016] The dispersing agent is sodium polyacrylate or sodium hexametaphosphate; the dispersing agent can make the solid particles such as nano titanium dioxide more uniformly dispersed in the treatment liquid, improving the stability and uniformity of the treatment liquid; The film forming aid is propylene glycol phenyl ether or dipropylene glycol butyl ether; The surfactant is sodium dodecyl benzene sulfonate or Tween-80; the surfactant improves the wettability and permeability of the treatment liquid on the metal surface, so that the treatment liquid can better adhere to the metal surface.

[0017] The accelerator is stannous chloride or manganese sulfate.

[0018] A preparation method of a treatment liquid for metal surface rust prevention, comprising the following steps, S1, preparing raw materials according to the above mass components; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 300 rpm to 400 rpm, add citric acid and acetic acid while stirring, and continue stirring for 20-30 minutes to obtain a first mixed solution; S3, adding dispersant, nano-titanium dioxide, benzotriazole and molybdate to the first mixed solution, continuing stirring at the stirring speed in S1 for 40-80 minutes, then slowly adding silane coupling agent, surfactant and accelerator, increasing the stirring speed to 700 rpm-800 rpm and continuing stirring for 25-35 minutes to obtain a second mixed solution; S4. Add a film-forming aid to the second mixed solution, continue stirring for 10-20 minutes to obtain a preliminary treatment solution, and filter the preliminary treatment solution to obtain a treatment solution.

[0019] Example 1, A method for preparing a treatment liquid for preventing rust on metal surfaces comprises the following steps: S1. Prepare raw materials. In this embodiment, prepare the following raw materials according to the following mass components: 8 parts of γ-aminopropyltriethoxysilane, 5 parts of nano-titanium dioxide, 1 part of benzotriazole, 2 parts of sodium molybdate, 1 part of sodium polyacrylate, 2 parts of propylene glycol phenyl ether, 1 part of sodium dodecylbenzenesulfonate, 1 part of stannous chloride, 1 part of citric acid, 1 part of acetic acid, and 77 parts of deionized water; the particle size of the nano-titanium dioxide is 30 nm; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 350 r / min, add citric acid and acetic acid while stirring, and continue stirring for 25 minutes to obtain a first mixed solution; S3. Slowly add sodium polyacrylate, nano-titanium dioxide, benzotriazole and sodium molybdate to the first mixed solution. After the last raw material is added, continue stirring at a stirring speed of 350 r / min for 50 min. Then slowly add γ-aminopropyltriethoxysilane, sodium dodecylbenzenesulfonate and stannous chloride. Increase the stirring speed to 700 r / min and continue stirring for 30 min to obtain a second mixed solution. S4. Add propylene glycol phenyl ether to the second mixed solution, continue stirring at a stirring speed of 700 r / min for 10 minutes to obtain a preliminary treatment liquid, let the preliminary treatment liquid stand to remove bubbles, and then filter to obtain a treatment liquid.

[0020] Example 2, A method for preparing a treatment liquid for preventing rust on metal surfaces comprises the following steps: S1. Prepare raw materials. In this embodiment, prepare the corresponding raw materials according to the following mass components: 10 parts of γ-aminopropyltriethoxysilane, 8 parts of nano-titanium dioxide, 1 part of benzotriazole, 2 parts of sodium molybdate, 1 part of sodium polyacrylate, 1 part of propylene glycol phenyl ether, 1 part of sodium dodecylbenzenesulfonate, 2 parts of stannous chloride, 1 part of citric acid, 1 part of acetic acid, and 72 parts of deionized water; the particle size of the nano-titanium dioxide is 30 nm; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 350 r / min, add citric acid and acetic acid while stirring, and continue stirring for 25 minutes to obtain a first mixed solution; S3. Slowly add sodium polyacrylate, nano-titanium dioxide, benzotriazole and sodium molybdate to the first mixed solution. After the last raw material is added, continue stirring at a stirring speed of 350 r / min for 50 min. Then slowly add γ-aminopropyltriethoxysilane, sodium dodecylbenzenesulfonate and stannous chloride. Increase the stirring speed to 700 r / min and continue stirring for 30 min to obtain a second mixed solution. S4, add propylene glycol phenyl ether to the second mixed solution, continue stirring at a stirring speed of 700r / min for 10min to obtain a preliminary treatment liquid, let the preliminary treatment liquid stand to remove bubbles, and then filter to obtain a treatment liquid Example 3, S1. Prepare raw materials. In this embodiment, prepare the following raw materials according to the following mass components: 8 parts of γ-aminopropyltriethoxysilane, 5 parts of nano-titanium dioxide, 1 part of benzotriazole, 2 parts of sodium molybdate, 1 part of sodium polyacrylate, 2 parts of propylene glycol phenyl ether, 1 part of sodium dodecylbenzenesulfonate, 1 part of stannous chloride, 1 part of citric acid, 1 part of acetic acid, and 77 parts of deionized water; the particle size of the nano-titanium dioxide is 30 nm; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 300 r / min, add citric acid and acetic acid while stirring, and continue stirring for 20 minutes to obtain a first mixed solution; S3. Slowly add sodium polyacrylate, nano-titanium dioxide, benzotriazole and sodium molybdate to the first mixed solution. After the last raw material is added, continue stirring at a stirring speed of 300 r / min for 40 min. Then slowly add γ-aminopropyltriethoxysilane, sodium dodecylbenzenesulfonate and stannous chloride. Increase the stirring speed to 750 r / min and continue stirring for 30 min to obtain a second mixed solution. S4. Add propylene glycol phenyl ether to the second mixed solution, continue stirring at a stirring speed of 750 r / min for 10 minutes to obtain a preliminary treatment liquid, let the preliminary treatment liquid stand to remove bubbles, and then filter to obtain a treatment liquid.

[0021] Example 4, S1. Prepare raw materials. In this embodiment, prepare the following raw materials by weight: 8 parts of γ-aminopropyltriethoxysilane, 5 parts of nano-titanium dioxide, 1 part of sodium polyacrylate, 2 parts of propylene glycol phenyl ether, 1 part of sodium dodecylbenzenesulfonate, 1 part of stannous chloride, 1 part of citric acid, 1 part of acetic acid, and 80 parts of deionized water; the particle size of the nano-titanium dioxide is 30 nm; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 350 r / min, add citric acid and acetic acid while stirring, and continue stirring for 25 minutes to obtain a first mixed solution; S3. Slowly add sodium polyacrylate and nano-titanium dioxide to the first mixed solution. After the last raw material is added, continue stirring at a stirring speed of 350 r / min for 50 min. Then slowly add γ-aminopropyltriethoxysilane, sodium dodecylbenzenesulfonate and stannous chloride. Increase the stirring speed to 700 r / min and continue stirring for 30 min to obtain a second mixed solution. S4. Add propylene glycol phenyl ether to the second mixed solution, continue stirring at a stirring speed of 700 r / min for 10 minutes to obtain a preliminary treatment liquid, let the preliminary treatment liquid stand to remove bubbles, and then filter to obtain a treatment liquid.

[0022] The treatment liquids prepared in the above four embodiments were sprayed on the metal surface respectively, and the rust condition of the metal surface was observed and recorded to judge the performance of the treatment liquid. The metal rust condition is shown in the attached figure of the specification. Figure 2 As shown, The comparison between the products of Example 1 and Example 2 shows that when the ratio of raw material components changes during preparation, the performance of the treatment liquid will be different; The comparison between the products of Example 1 and Example 3 shows that when the process parameters such as stirring during preparation are changed, the performance of the treatment liquid will also be different; The comparison between the products of Example 1 and Example 4 shows that when the raw material components are changed, the performance of the treatment liquid will be greatly different; This technical solution optimizes and limits the raw material components and proportions of the treatment liquid and the preparation process, thereby improving the anti-rust treatment effect of the treatment liquid and greatly improving the use effect.

[0023] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A treatment liquid for rust prevention of metal surfaces, characterized in that: The composition includes the following components by mass: 5-15 parts of silane coupling agent, 3-10 parts of nano-titanium dioxide, 1-4 parts of benzotriazole, 1-4 parts of molybdate, 1-5 parts of dispersant, 2-6 parts of film-forming aid, 1-4 parts of surfactant, 0.5-3 parts of accelerator, 0.5-3 parts of citric acid, 1-5 parts of acetic acid, and 50-80 parts of deionized water.

2. A treatment liquid for preventing rust on metal surfaces according to claim 1, characterized in that: The silane coupling agent is one of γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane and γ-glycidoxypropylmethyldimethoxysilane.

3. The treatment liquid for preventing rust on metal surfaces according to claim 1, characterized in that: The dispersant is sodium polyacrylate or sodium hexametaphosphate.

4. A treatment liquid for rust prevention of metal surfaces according to claim 1, characterized in that: The film-forming aid is propylene glycol phenyl ether or dipropylene glycol butyl ether.

5. The treatment liquid for preventing rust on metal surfaces according to claim 1, characterized in that: The surfactant is sodium dodecylbenzenesulfonate or Tween-80.

6. The treatment liquid for preventing rust on metal surfaces according to claim 1, characterized in that: The accelerator is stannous chloride or manganese sulfate.

7. The method for preparing a treatment liquid for preventing rust on metal surfaces according to claim 1, wherein: The following steps are included: S1. Prepare raw materials according to the above mass components; S2. Add deionized water to the stirring processing container, stir the deionized water at a speed of 300 rpm to 400 rpm, add citric acid and acetic acid while stirring, and continue stirring for 20-30 minutes to obtain a first mixed solution; S3, adding dispersant, nano-titanium dioxide, benzotriazole and molybdate to the first mixed solution, continuing stirring at the stirring speed in S1 for 40-80 minutes, then slowly adding silane coupling agent, surfactant and accelerator, increasing the stirring speed and continuing stirring for 25-35 minutes to obtain a second mixed solution; S4. Add a film-forming aid to the second mixed solution, continue stirring for 10-20 minutes to obtain a preliminary treatment solution, and filter the preliminary treatment solution to obtain a treatment solution.

8. The method for preparing a treatment liquid for preventing rust on metal surfaces according to claim 7 is characterized in that: In the step S3, after adding the silane coupling agent, surfactant and accelerator, the stirring speed is increased to 700 r / min-800 r / min.

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