A metal anti-rust paint, its preparation method and application

Abstract

This application belongs to the field of metal surface rust prevention technology, and discloses a metal rust-preventive paint, its preparation method, and its application. The raw materials for the metal rust-preventive paint of this application include a base material, zinc powder, and iron oxide red powder. The base material includes: tetraethyl orthosilicate, polyvinyl butyral resin, hydroxyl acrylic resin, and water. The preparation method of the metal rust-preventive paint of this application includes the following steps: (1) mixing the raw materials to obtain a color paste; (2) adding hydroxyl acrylic resin to the color paste and adjusting the viscosity to obtain the metal rust-preventive paint. The metal rust-preventive paint obtained in this application is used in metal surface treatment. The metal rust-preventive paint obtained in this application has high metallic luster, good water resistance and acid and alkali resistance, a simple formulation process, low construction difficulty, and is suitable for metal surface rust prevention treatment under various conditions.

Description

Technical Field

[0001] This application relates to the field of metal surface anti-rust treatment technology, and in particular to a metal anti-rust paint, its preparation method and application. Background Technology

[0002] In the corrosion protection of steel and other metal surfaces, common treatment methods include electroplating and chromating. These processes require the use of reagents containing large amounts of heavy metals, which can easily cause environmental pollution and are also quite expensive to produce. Therefore, rust-preventive paint has been developed to address this issue. Rust-preventive paint can replace electroplating and is a coating that protects metal surfaces from chemical or electrochemical corrosion by the atmosphere, acids, alkalis, etc. Rust-preventive paints are generally divided into oil-based and water-based types. Oil-based rust-preventive paints contain toxic substances, posing a significant hazard to operators. Water-based metal rust-preventive paints are non-toxic, but their water resistance, salt spray resistance, and other chemical resistance properties are inferior to oil-based paints. From an environmental perspective, people tend to use water-based paints with lower toxicity. Therefore, how to achieve strong adhesion, good water resistance, and a certain metallic luster in water-based metal rust-preventive paints is currently the main technical problem that needs to be solved. Summary of the Invention

[0003] In order to solve at least one of the above-mentioned technical problems, and to develop a metal anti-rust paint with good weather resistance that can replace electroplating process for protecting metal surfaces, this application provides a metal anti-rust paint, a preparation method and an application.

[0004] On one hand, this application provides a metal anti-rust paint, which includes a base material, zinc powder and iron oxide powder in a weight ratio of 2-5:2:0.5. The base material includes the following raw materials in parts by weight: 11-26 parts of tetraethyl orthosilicate, 6-13 parts of polyvinyl butyral resin, 16-30 parts of hydroxyl acrylic resin and 44-65 parts of water.

[0005] By adopting the above technical solution, this application synthesizes low molecular weight hydroxyl acrylic resin by solution polymerization, and then blends it with tetraethyl orthosilicate and polyvinyl butyral resin to obtain a base material. Modified iron oxide powder and zinc powder are added to the base material. After the anti-rust paint is applied, the paint surface has good gloss and acid and alkali resistance, and also has strong adhesion.

[0006] Preferably, the base material comprises the following raw materials in parts by weight: 14 parts of tetraethyl orthosilicate, 11 parts of polyvinyl butyral resin, 25 parts of hydroxyl acrylic resin, and 50 parts of water.

[0007] Optionally, the iron oxide red powder is modified iron oxide red powder, and the preparation method of the modified iron oxide red powder is as follows: phosphoric acid and aluminum orthophosphate are added to acetone and stirred, then iron oxide red powder is added and stirred, and baked at 60-80℃ for 1-2 hours to obtain modified iron oxide red powder; wherein, the weight ratio of phosphoric acid, aluminum orthophosphate, acetone and iron oxide red powder is 0.1-1:0.8-1.5:5-10:35-45.

[0008] Optionally, the raw materials for the hydroxy acrylic resin include hydroxyethyl methacrylate, polymerizing monomers, chain transfer agents, initiators, and organic solvents in a weight ratio of 10.6-19.5:28:2.2:0.5:50.

[0009] Optionally, the hydroxy acrylic resin is prepared by mixing an organic solvent, hydroxyethyl methacrylate and a polymeric monomer, heating to 70-90°C, adding a chain transfer agent and an initiator, and reacting for 1.5-2.5 hours to obtain the hydroxy acrylic resin.

[0010] Optionally, the polymerizable monomer includes one or more of MMA, St, n-BA, and AA.

[0011] Preferably, the polymeric monomer is a mixture of n-BA and AA in a weight ratio of 1:2.5.

[0012] Preferably, the zinc powder has a particle size of 100-180 mesh, and the iron oxide powder has a particle size of 140-210 mesh.

[0013] Secondly, this application provides a method for preparing the above-mentioned metal anti-rust paint, including the following steps:

[0014] S1. Add tetraethyl orthosilicate, polyvinyl butyral resin and 40-70 wt% water to a container, add iron oxide red powder and zinc powder at a stirring speed of 500-1000 r / min, stir and disperse for 5-20 min, grind to a fineness of 1-30 μm to obtain a color paste.

[0015] S2. Add hydroxyl acrylic resin to the color paste obtained in step S1, stir at a stirring speed of 300-600 r / min for 4-10 min, add the remaining water, and adjust the viscosity to 50-70 s as measured by a Ford-4 viscometer to obtain the metal anti-rust paint.

[0016] Thirdly, this application provides the application of the aforementioned metal anti-rust paint in the anti-rust treatment of metal surfaces.

[0017] Optionally, the method of applying the metal anti-rust paint includes the following steps:

[0018] (1) Pre-treat the metal surface to be sprayed. The pre-treat steps are: dry the metal surface at 60-100℃ for 10-30 min.

[0019] (2) Dilute the metal anti-rust paint to the application viscosity using water and / or organic solvents and then spray it onto the metal surface. After that, dry it at 120-190℃ for 12-30 min to make the dry film thickness 10-22 μm. The application viscosity is the viscosity of the diluted metal anti-rust paint when measured by a Forte 4 viscometer at 15-30 s.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. The metal anti-rust paint prepared in this application has a high metallic luster. By adding hydroxyl acrylic resin and controlling the relevant property parameters, the metal anti-rust paint has good water resistance and acid and alkali resistance.

[0022] 2. The metal anti-rust paint prepared in this application has a fast drying speed, a simple formulation process, and low construction difficulty, making it suitable for metal surface anti-rust treatment under various conditions. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the embodiments.

[0024] This application designs a metal anti-rust paint, which includes a base material, zinc powder and iron oxide powder in a weight ratio of 2-5:2:0.5. The base material includes the following raw materials in parts by weight: 11-26 parts of tetraethyl orthosilicate, 6-13 parts of polyvinyl butyral resin, 16-30 parts of hydroxyl acrylic resin and 44-65 parts of water.

[0025] The iron oxide red powder is a modified iron oxide red powder. The preparation process of the modified iron oxide red powder is as follows: phosphoric acid and aluminum orthophosphate are diluted in acetone, then iron oxide red powder is added and stirred, dried, and baked at 60-80℃ for 1-2 hours to obtain modified iron oxide red powder; wherein, the weight ratio of phosphoric acid, aluminum orthophosphate, acetone and iron oxide red powder is 0.1-1:0.8-1.5:5-10:35-45.

[0026] The preparation process of the hydroxyl acrylic resin is as follows: an organic solvent is added to a reaction vessel, hydroxyethyl methacrylate is added, a polymerizing monomer is added, the temperature is raised to 70-90℃, a chain transfer agent and an initiator are added, and the reaction is carried out for 1.5-2.5 hours to obtain the hydroxyl acrylic resin; the polymerizing monomer is one or more of MMA, St, n-BA, and AA.

[0027] The metal anti-rust paint of this application is prepared by the following method, including the following steps:

[0028] (1) Pre-treat the metal surface to be sprayed. The pre-treat steps are: dry the metal surface at 60-100℃ for 10-30 min.

[0029] (2) Dilute the metal anti-rust paint to the application viscosity using water and / or organic solvents and then spray it onto the metal surface. After that, dry it at 120-190℃ for 12-30 min to make the dry film thickness 10-22 μm. The application viscosity is the viscosity of the diluted metal anti-rust paint when measured by a Forte 4 viscometer at 15-30 s.

[0030] The metal anti-rust paint of this application can be used in the anti-rust treatment of metal surfaces.

[0031] The metal surface to be coated is pretreated by the following steps: drying at 60-100℃ for 10-30 minutes; diluting the metal anti-rust paint with water and / or organic solvent to the application viscosity, wherein the application viscosity is the viscosity of the diluted metal anti-rust paint measured by a Forte 4 viscometer at 15-30 seconds; spraying a primer onto the metal surface and drying at 120-190℃ for 12-30 minutes to achieve a dry film thickness of 10-22 μm; and cooling to complete the treatment.

[0032] The technical problem addressed by this application is that traditional metal surface rust prevention methods, such as electroplating, require the use of reagents containing large amounts of heavy metals for surface treatment, which easily causes environmental pollution and is also quite expensive to produce. Existing electroplating alternatives mainly involve applying rust-preventive paints. However, oil-based rust-preventive paints contain toxic substances, posing a significant hazard to operators. Therefore, people tend to use water-based rust-preventive paints with lower toxicity. However, while water-based metal rust-preventive paints are non-toxic, their water resistance, salt spray resistance, and other chemical resistance properties are inferior to oil-based rust-preventive paints. This application improves the water resistance and acid / alkali resistance of water-based metal rust-preventive paints and increases their gloss by using hydroxyl acrylic resin and controlling its hydroxyl value, while simultaneously adding zinc powder and modified iron oxide red powder. The metal rust-preventive paint prepared by this application has a fast drying speed, a simple formulation process, and low application difficulty, making it suitable for metal surface rust prevention treatment under various conditions.

[0033] The raw materials used in the embodiments of this application are from the following sources:

[0034] Hydroxyethyl methacrylate, Jinan Century Tongda Chemical Co., Ltd.;

[0035] Butyl acetate, Nanjing Chemical Reagent Co., Ltd.;

[0036] Mercaptoethanol, Jinan Century Tongda Chemical Co., Ltd.

[0037] Azobisisobutyronitrile (AIBN), Shanghai Mairui Biochemical Technology Co., Ltd.

[0038] n-BA (butyl acrylate), AA (acrylic acid), MMA (methyl methacrylate), Shanghai Kaisai Chemical Co., Ltd.;

[0039] Ethyl orthosilicate, Jinjinle (Hunan) Chemical Co., Ltd.;

[0040] Polyvinyl butyral resin, Guangzhou Shixing Chemical Co., Ltd.;

[0041] Zinc powder and iron oxide red powder, Shanghai Titanium Industry Co., Ltd.

[0042] Preparation Examples 1-5

[0043] Preparation Examples 1-5 show different hydroxyl acrylic resins obtained, differing only in their hydroxyl values.

[0044] The preparation process of Examples 1-5 is as follows: butyl acetate organic solvent, hydroxyethyl methacrylate, and polymerizable monomers are added to a reaction vessel, and the temperature is raised to 75°C. Then, chain transfer agent and initiator are added, nitrogen gas is introduced as a protective device, and condensate is introduced for reflux. The chain transfer agent and initiator are added dropwise to the reaction vessel using a peristaltic pump, and the reaction is carried out for 2 hours to obtain the hydroxyl acrylic resin.

[0045] In Preparation Examples 1-5, the chain transfer agent was mercaptoethanol and the initiator was azobisisobutyronitrile.

[0046] The specific raw material ratios are shown in Table 1.

[0047] Table 1

[0048]

[0049] In all of the preparation examples 1-5, the polymerizable monomers were a mixture of n-BA and AA in a weight ratio of 1:2.5.

[0050] Preparation Examples 6-8

[0051] Preparation Examples 6-8 are different hydroxyl acrylic resins prepared. Preparation Examples 6-8 are based on Preparation Example 3, the difference being the different types of polymerizable monomers.

[0052] The monomer used in Preparation Example 6 is AA.

[0053] The monomer used in Preparation Example 7 is n-BA.

[0054] The monomers in Preparation Example 8 were a mixture of n-BA and MMA in a weight ratio of 1:2.5.

[0055] Examples 1-8

[0056] Examples 1-8 are metal anti-rust primers made from different raw materials. The difference lies in the type of hydroxyl acrylic resin in the base material, as shown in Table 2.

[0057] Table 2

[0058] Metal anti-rust primer Hydroxy acrylic resin Example 1 Preparation Example 1 Example 2 Preparation Example 2 Example 3 Preparation Example 3 Example 4 Preparation Example 4 Example 5 Preparation Example 5 Example 6 Preparation Example 6 Example 7 Preparation Example 7 Example 8 Preparation Example 8

[0059] The specific proportions of the base materials in Examples 1-8 are: 25 kg hydroxyl acrylic resin, 11 kg polyvinyl butyral resin, 14 kg tetraethyl orthosilicate and 50 kg water.

[0060] The metal anti-rust primers in Examples 1-8 consist of a base material, zinc powder, and iron oxide red powder in a weight ratio of 4:2:0.5.

[0061] In Examples 1-8, the zinc powder had a particle size of 120 mesh, and the iron oxide red powder had a particle size of 160 mesh.

[0062] The preparation process of the metal anti-rust paint in Examples 1-8 is as follows:

[0063] S1. Add tetraethyl orthosilicate, polyvinyl butyral resin and 50wt% water to a container, add iron oxide red powder and zinc powder at a stirring speed of 800r / min, stir and disperse for 15min, grind to a fineness of 10um to obtain a color paste.

[0064] S2. Add hydroxyl acrylic resin to the color paste obtained in step S1, stir at a stirring speed of 400 r / min for 8 min, add the remaining water, and adjust the viscosity to 60 s as measured by a Ford-4 viscometer to obtain the metal anti-rust paint.

[0065] Examples 9-12

[0066] Examples 9-12 are based on Example 3 and are metal anti-rust paints prepared with different raw material ratios. The difference lies in the different ratios of the base material, as shown in Table 3.

[0067] Table 3

[0068]

[0069] Among them, the metal anti-rust paint in Examples 9-12 includes a base material, zinc powder and iron oxide red powder in a weight ratio of 4:2:0.5.

[0070] The hydroxy acrylic resin used in Examples 9-12 is the hydroxy acrylic resin obtained in Preparation Example 3.

[0071] In Examples 9-12, the zinc powder had a particle size of 120 mesh, and the iron oxide red powder had a particle size of 160 mesh.

[0072] Examples 13-14

[0073] Example 13 is based on Example 3, except that the metal anti-rust paint in Example 13 includes a base material, zinc powder and iron oxide red powder in a weight ratio of 2:2:0.5.

[0074] Example 14 is based on Example 3, except that the metal anti-rust paint in Example 14 includes a base material, zinc powder and iron oxide red powder in a weight ratio of 5:2:0.5.

[0075] Example 15

[0076] Example 15 is based on Example 3, except that the iron oxide powder used in Example 15 is modified iron oxide powder. The preparation process of the modified iron oxide powder is as follows: phosphoric acid and aluminum orthophosphate are diluted in acetone, then iron oxide powder is added and stirred, filtered, the filter residue is dried, and baked at 75°C for 1.5 hours to obtain modified iron oxide powder; wherein, the weight ratio of phosphoric acid, aluminum orthophosphate, acetone and iron oxide powder is 0.6:1.2:7:38.

[0077] Comparative Examples 1-3

[0078] Comparative Example 1 is based on Example 3, except that hydroxyethyl methacrylate is not added during the polymerization of the hydroxy acrylic resin in Comparative Example 1.

[0079] Comparative Example 2 is based on Example 3, except that tetraethyl orthosilicate is not added in Comparative Example 2.

[0080] Comparative Example 3 is based on Example 3, except that iron oxide powder is not added in Comparative Example 3.

[0081] Application Example 1-15 and Comparative Application Example 1-3

[0082] Application Examples 1-15 correspond to the applications of Examples 1-15 in metal surface treatment, and Comparative Application Examples 1-3 correspond to the applications of Comparative Examples 1-3 in metal surface treatment.

[0083] The specific application process is as follows: Dry the steel plate at 75℃ for 20 minutes, dilute the metal anti-rust paint with water to the viscosity corresponding to 25 seconds measured by a Forte 4 viscometer, spray the metal anti-rust paint onto the surface of the steel plate, dry it at 130℃ for 15 minutes to make the dry film thickness 16um, and the treatment is completed after cooling.

[0084] Performance testing

[0085] 1. Refer to standard GB / T 9754-2007 to measure the 60° gloss of the surface in Application Example 1-15 and Comparative Application Example 1-3. Place the painted steel plate horizontally with the painted side facing up, and use a calibrated gloss meter to test three different points on the sample. Take the average value as the result.

[0086] 2. The water resistance of Application Examples 1-15 and Comparative Application Examples 1-3 was determined by immersion method according to standard GB / T1733-1993. Specific measurement method: water temperature 40℃. The painted steel plates were sealed with tape, with a sealing width of approximately 0.5cm. The samples were then placed in a sealed container filled with water, ensuring that 2 / 3 of each steel plate was submerged. At regular intervals, the steel plates were removed to observe and record any blistering, peeling, or rusting on the paint film surface.

[0087] 3. The acid and alkali resistance of Application Examples 1-15 and Comparative Application Examples 1-3 were determined according to Method A in standard GB / T9274-1988. The acid solution used for testing was 0.1 mol / L H2SO4, and the alkali solution was 0.1 mol / L NaOH. The sample sealing and observation were the same as above.

[0088] The test results are shown in Table 4.

[0089] Table 4

[0090] Average gloss Water resistance Acid resistance Alkali resistance Application Example 1 105 Rust spots appeared after 257 hours. Rust spots appeared after 221 hours. Rust spots appeared after 186 hours. Application Example 2 117 Rust spots appeared after 275 hours. Rust spots appeared after 239 hours. Rust spots appeared after 196 hours. Application Example 3 123 Rust spots appeared after 281 hours. Rust spots appeared after 247 hours. Rust spots appeared after 208 hours. Application Example 4 112 Rust spots appeared after 264 hours Rust spots appeared after 232 hours. Rust spots appeared after 200 hours. Application Example 5 109 Rust spots appeared after 243 hours. Rust spots appeared after 217 hours. Rust spots appeared after 180 hours. Application Example 6 97 Rust spots appeared after 215 hours. Rust spots appeared after 184 hours. Rust spots appeared after 161 hours. Application Example 7 103 Rust spots appeared after 222 hours. Rust spots appeared after 196 hours. Rust spots appeared after 169 hours. Application Example 8 108 Rust spots appeared after 238 hours. Rust spots appeared after 204 hours. Rust spots appeared after 172 hours. Application Example 9 110 Rust spots appeared after 251 hours. Rust spots appeared after 215 hours. Rust spots appeared after 180 hours. Application Example 10 106 Rust spots appeared after 263 hours. Rust spots appeared after 231 hours. Rust spots appeared after 186 hours. Application Example 11 113 Rust spots appeared after 265 hours. Rust spots appeared after 235 hours. Rust spots appeared after 195 hours. Application Example 12 115 Rust spots appeared after 246 hours Rust spots appeared after 210 hours. Rust spots appeared after 174 hours. Application Example 13 115 Rust spots appeared after 255 hours. Rust spots appeared after 206 hours. Rust spots appeared after 167 hours. Application Example 14 119 Rust spots appeared after 261 hours. Rust spots appeared after 233 hours. Rust spots appeared after 200 hours. Application Example 15 128 Rust spots appeared after 298 hours. Rust spots appeared after 242 hours Rust spots appeared after 223 hours. Application Comparative Example 1 76 Rust spots appeared after 189 hours. Rust spots appeared after 157 hours. Rust spots appeared after 122 hours Application Comparative Example 2 80 Rust spots appeared after 174 hours. Rust spots appeared after 148 hours. Rust spots appeared after 113 hours. Application Comparative Example 3 71 Rust spots appeared after 171 hours. Rust spots appeared after 145 hours. Rust spots appeared after 110 hours.

[0091] Analysis of the data in Table 4 shows that the metal anti-rust paint prepared in this application has high gloss and good water resistance and acid and alkali resistance.

[0092] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A metal anti-rust paint, characterized in that, The metal anti-rust paint comprises a base material, zinc powder and iron oxide powder in a weight ratio of 2-5:2:0.

5. The base material comprises the following raw materials in parts by weight: 11-26 parts of tetraethyl orthosilicate, 6-13 parts of polyvinyl butyral resin, 16-30 parts of hydroxyl acrylic resin and 44-65 parts of water. The iron oxide red powder is a modified iron oxide red powder. The preparation method of the modified iron oxide red powder includes: adding phosphoric acid and aluminum orthophosphate to acetone and stirring, then adding iron oxide red powder and stirring, and baking at 60-80℃ for 1-2 hours to obtain modified iron oxide red powder; wherein, the weight ratio of phosphoric acid, aluminum orthophosphate, acetone and iron oxide red powder is 0.1-1:0.8-1.5:5-10:35-45.

2. The metal anti-rust paint according to claim 1, characterized in that, The base material comprises the following raw materials in parts by weight: 14 parts of tetraethyl orthosilicate, 11 parts of polyvinyl butyral resin, 25 parts of hydroxyl acrylic resin, and 50 parts of water.

3. The metal anti-rust paint according to claim 1, characterized in that, The raw materials for the hydroxy acrylic resin include hydroxyethyl methacrylate, polymerizing monomers, chain transfer agents, initiators, and organic solvents in a weight ratio of 10.6-19.5:28:2.2:0.5:

50.

4. The metal anti-rust paint according to claim 3, characterized in that, The preparation method of the hydroxy acrylic resin includes: mixing an organic solvent, hydroxyethyl methacrylate and a polymeric monomer, heating to 70-90°C, adding a chain transfer agent and an initiator, and reacting for 1.5-2.5 hours to obtain the hydroxy acrylic resin.

5. The metal anti-rust paint according to claim 3, characterized in that, The polymer monomers include one or more of MMA, St, n-BA, and AA.

6. The metal anti-rust paint according to claim 1, characterized in that, The zinc powder has a particle size of 100-180 mesh, and the iron oxide powder has a particle size of 140-210 mesh.

7. A method for preparing a metal anti-rust paint according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Add tetraethyl orthosilicate, polyvinyl butyral resin and 40-70 wt% water to a container, add iron oxide red powder and zinc powder at a stirring speed of 500-1000 r / min, stir and disperse for 5-20 min, grind to a fineness of 1-30 μm to obtain a color paste. S2. Add hydroxyl acrylic resin to the color paste obtained in step S1, stir at a stirring speed of 300-600 r / min for 4-10 min, add the remaining water, and adjust the viscosity to 50-70s as measured by a Ford-4 viscometer to obtain the metal anti-rust paint.

8. The application of the metal anti-rust paint according to any one of claims 1-6 in the anti-rust treatment of metal surfaces.

9. The application of the metal anti-rust paint according to claim 8 in the rust prevention treatment of metal surfaces, characterized in that, Includes the following steps: (1) Pre-treat the metal surface to be sprayed. The pre-treat steps are: dry the metal surface at 60-100℃ for 10-30 min. (2) Dilute the metal anti-rust paint to the application viscosity using water and / or organic solvents and then spray it onto the metal surface. After that, dry it at 120-190℃ for 12-30 min to make the dry film thickness 10-22 μm. The application viscosity is the viscosity of the diluted metal anti-rust paint when measured by a Forte 4 viscometer at 15-30 s.

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