Rust and corrosion prevention modified coating film powder and preparation method and application thereof
By plasma treatment and amorphous silica coating of ferric phosphate powder, the problems of weather resistance and dispersibility of ferric phosphate are solved, achieving a highly efficient rust and corrosion prevention effect, which is suitable for pigment applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUNAN BAIYI SHUANGMA NEW MATERIALS CO LTD
- Filing Date
- 2026-03-23
- Publication Date
- 2026-06-09
AI Technical Summary
Ferric phosphate has poor weather resistance, its particles are prone to agglomeration and sedimentation, and it has poor compatibility with organic base materials, which affects its dispersibility and heat resistance, resulting in poor rust and corrosion prevention effects.
By treating iron phosphate powder with plasma, high-density oxygen-containing active groups such as hydroxyl groups are introduced, and then an amorphous silicon oxide layer is coated on its surface. Matching functional groups are grafted into different matrix systems to improve dispersibility and compatibility.
It significantly improves the weather resistance, heat resistance, and anti-corrosion and anti-rust effects of ferric phosphate, avoids agglomeration and sedimentation, and enhances dispersibility and interfacial bonding in different matrix systems.
Smart Images
Figure CN121873595B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pigment technology, specifically to a rust-proof and corrosion-resistant modified coating powder, its preparation method, and its application. Background Technology
[0002] Ferric phosphate is a non-toxic white anti-rust pigment that can replace toxic red lead, lead chromate yellow, and zinc chromate yellow in paints. It is also an excellent feed additive, catalyst, and a novel battery cathode material, as well as a superior raw material for the preparation of lithium iron phosphate, the cathode material for lithium-ion batteries. 3- It has a basic chemical rust prevention function.
[0003] However, ferric phosphate has poor weather resistance, its particles are prone to agglomeration and sedimentation, affecting its dispersibility, and it has poor compatibility with organic base materials. At the same time, ferric phosphate has poor heat resistance and is prone to yellowing when heated, thus affecting its coloring.
[0004] Therefore, it is necessary to develop a rust-proof and corrosion-resistant modified coating powder to improve its weather resistance, dispersibility, compatibility and heat resistance, which will have better applications. Summary of the Invention
[0005] The purpose of this invention is to propose a rust-proof and corrosion-resistant modified coating powder, its preparation method, and its application. It has good mechanical properties, significantly improved weather resistance and heat resistance, and good dispersibility and compatibility in different matrix systems, without the problem of agglomeration and sedimentation. It also improves the anti-corrosion and anti-rust effect and can be widely used as a pigment in existing technologies.
[0006] The technical solution of this invention is implemented as follows:
[0007] This invention provides a method for preparing a rust-proof and corrosion-resistant modified coating powder, comprising the following steps:
[0008] S1. Ferric phosphate powder is subjected to plasma treatment to obtain pretreated ferric phosphate powder;
[0009] S2. Add rare earth salts to water to obtain a rare earth solution; add alkyl orthosilicate and alkali to ethanol, add the rare earth solution, and stir to form a doped silica sol;
[0010] S3. Add the pretreated iron phosphate powder to the doped silica sol, stir and mix evenly, dry, calcine, and grind to obtain silicon-coated iron phosphate powder;
[0011] S4. React silicon-doped iron phosphate powder with chlorinated polyethylene glycol, haloalkanes, or surfactants to obtain rust-proof and corrosion-resistant modified coating powder.
[0012] As a further improvement of the present invention, the interaction with the surfactant in step S4 is as follows:
[0013] Add silicon-doped iron phosphate powder to water, add surfactant, stir and mix evenly, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0014] Specifically:
[0015] Add 10 parts by weight of silicon-doped iron phosphate powder to water, add 1-2 parts by weight of surfactant, stir and mix evenly, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0016] As a further improvement of the present invention, the surfactant in step S4 is selected from at least one of sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium tetradecyl sulfonate, sodium tetradecylbenzene sulfonate, sodium tetradecyl sulfate, sodium hexadecylbenzene sulfonate, sodium hexadecyl sulfonate, sodium hexadecyl sulfate, sodium octadecyl sulfonate, sodium octadecylbenzene sulfonate, and sodium octadecyl sulfate.
[0017] As a further improvement to the present invention, the reaction with chlorinated polyethylene glycol in step S4 is as follows:
[0018] Chlorinated polyethylene glycol was prepared by reacting polyethylene glycol with thionyl chloride; the structure of the chlorinated polyethylene glycol is as follows: or .
[0019] Silicon-doped iron phosphate powder and chlorinated polyethylene glycol were reacted under the action of an acid-binding agent to obtain a rust-proof and corrosion-resistant modified coating powder.
[0020] Specifically:
[0021] Add 1 part by weight of polyethylene glycol to dichloromethane, add a dichloromethane solution containing 0.2-0.3 parts by weight of sulfoxide, stir the mixture at room temperature for 1-2 hours, remove the solvent and unreacted sulfoxide under reduced pressure to obtain chlorinated polyethylene glycol.
[0022] Ten parts by weight of silicon-doped iron phosphate powder, 1-2 parts by weight of chlorinated polyethylene glycol and 3-5 parts by weight of acid-binding agent were added to acetone, heated and stirred under reflux for 3-5 hours, filtered, washed and dried to obtain rust-proof and corrosion-resistant modified coating powder.
[0023] The acid-binding agent is selected from at least one of triethylamine, NaOH, KOH, and potassium carbonate.
[0024] As a further improvement of the present invention, the chlorinated polyethylene glycol in step S4 is a mixture of monochlorinated polyethylene glycol and dichlorinated polyethylene glycol, wherein the molecular weight of the polyethylene glycol is 200-1000.
[0025] As a further improvement of the present invention, the reaction with the haloalkane in step S4 is as follows:
[0026] Silicon-doped iron phosphate powder and haloalkanes were reacted under the action of an acid-binding agent to obtain a rust-proof and corrosion-resistant modified coating powder.
[0027] Specifically as follows:
[0028] Ten parts by weight of silicon-doped iron phosphate powder, 1.5-2 parts by weight of haloalkane and 3-5 parts by weight of acid-binding agent were added to acetonitrile, heated and stirred under reflux for 3-5 hours, filtered, washed and dried to obtain rust-proof and corrosion-resistant modified coating powder.
[0029] The acid-binding agent is selected from at least one of triethylamine, NaOH, KOH, and potassium carbonate.
[0030] As a further improvement of the present invention, the haloalkane mentioned in step S4 is selected from at least one of 1-chlorododecane, 1-chlorotridecane, 1-chlorotetradecane, 1-chloropentadecanane, 1-chlorohexadecane, 1-chloroheptadecane, 1-chlorooctadecane, 1-bromododecane, 1-bromotridecane, 1-bromotetradecane, 1-bromopentadecanane, 1-bromohexadecane, 1-bromoheptadecane, and 1-bromooctadecane.
[0031] As a further improvement of the present invention, the plasma treatment conditions in step S1 are: air flow rate of 50-80 mL / min, power of 300-400 W, vacuum degree of 400-600 Pa, and treatment time of 1800-2400 s.
[0032] As a further improvement of the present invention, the rare earth salt in step S2 is selected from at least one of lanthanum nitrate, lanthanum chloride, cerium nitrate, and cerium chloride; the alkyl orthosilicate is methyl or ethyl orthosilicate; the base is NaOH or KOH; and the mass ratio of the rare earth salt, water, alkyl orthosilicate, base, and ethanol is 0.1-0.15:7-10:2-4:0.1-0.2:50-70.
[0033] As a further improvement of the present invention, the mass ratio of the pretreated iron phosphate powder and the doped silica sol in step S3 is 1-2:10-15, the drying temperature is 100-120℃, the calcination temperature is 300-400℃, and the time is 1-2h.
[0034] The present invention further protects a rust-proof and corrosion-resistant modified coating powder prepared by the above-mentioned preparation method.
[0035] This invention further protects the application of the above-mentioned rust-proof and corrosion-resistant modified coating powder in pigments.
[0036] The present invention has the following beneficial effects:
[0037] The rust-proof and corrosion-resistant modified coating powder prepared by this invention can form insoluble solid ferric phosphate complex salts with metal atoms, such as iron atoms, on the metal surface through phosphate groups, which can isolate the metal from corrosion by water, oxygen, chlorine, etc. At the same time, due to the high surface energy of the material, it is easy to combine with other atoms, which can increase the density of the coating, thereby greatly improving the anti-corrosion and anti-rust performance.
[0038] This invention first involves plasma treatment of ferric phosphate, introducing high-density oxygen-containing active groups such as hydroxyl groups onto the surface of the ferric phosphate powder. This increases the surface energy of the powder, facilitating the coating of a silicon oxide layer. The introduced amorphous silicon oxide layer does not cause changes in pigment color and simultaneously improves the pigment's weather resistance, heat resistance, and corrosion resistance. The doped rare earth elements reduce microcracks, inhibit oxygen reduction reactions, and synergistically enhance the anti-corrosion and anti-rust effects. The SiO2 coating layer controls the release rate of phosphate and rare earth ions, preventing explosive release and achieving long-term protection.
[0039] Finally, based on the different polarities of the target organic matrix, matching functional groups are grafted onto the surface of the coating membrane:
[0040] In non-polar systems, such as polypropylene and polyethylene: long-chain alkyl groups are grafted onto the surface to reduce the surface energy of the powder and improve its dispersibility in non-polar solvents.
[0041] In polar systems, such as epoxy resins and polyurethanes, grafted PEG chains can form hydrogen bonds with the matrix, enhancing interfacial bonding.
[0042] In water-based coating systems, such as water-based polyacrylic coatings, treatment with surfactants introduces negatively charged groups into the coating layer, achieving stable dispersion through electrostatic repulsion and preventing agglomeration and sedimentation in highly polar water media. Attached Figure Description
[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0044] Figure 1 SEM image of iron phosphate powder;
[0045] Figure 2 Here is a SEM image of the rust-proof and corrosion-resistant modified coating powder prepared in Example 1;
[0046] Figure 3 The image shows the infrared spectrum of the rust-proof and corrosion-resistant modified coating powder prepared in Example 3. Detailed Implementation
[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0048] Example 1
[0049] This embodiment provides a method for preparing a rust-proof and corrosion-resistant modified coating powder, including the following steps:
[0050] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0051] The plasma treatment conditions are: air flow rate of 50 mL / min, power of 300 W, vacuum degree of 400 Pa, and treatment time of 1800 s;
[0052] S2. Add 0.1g of lanthanum nitrate to 7mL of water to obtain a rare earth solution; add 2g of methyl orthosilicate and 0.1g of NaOH to 50g of ethanol, add the rare earth solution, and stir to form a doped silica sol;
[0053] S3. Add 1g of pretreated iron phosphate powder to 10g of doped silica sol, stir and mix evenly, dry at 100℃ for 2h, calcine at 300℃ for 1h, and grind for 1h to obtain silicon-doped iron phosphate powder.
[0054] S4. Add 1g of silicon-doped iron phosphate powder to 100mL of water, add 0.1g of sodium octadecylbenzenesulfonate, stir and mix for 1h, and dry to obtain rust-proof and corrosion-resistant modified coating powder. Figure 1 The image shows a large amount of agglomerated particles with blurred outlines. Figure 2 The image shows the SEM image of the rust-proof and corrosion-resistant modified coating powder. The absence of agglomeration and the uniform particle size indicate that the rust-proof and corrosion-resistant modified coating powder has good dispersibility.
[0055] Example 2
[0056] This embodiment provides a method for preparing a rust-proof and corrosion-resistant modified coating powder, including the following steps:
[0057] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0058] The plasma treatment conditions were: air flow rate of 80 mL / min, power of 400 W, vacuum degree of 600 Pa, and treatment time of 2400 s.
[0059] S2. Add 0.15g of cerium nitrate to 10mL of water to obtain a rare earth solution; add 4g of tetraethyl orthosilicate and 0.2g of KOH to 70g of ethanol, add the rare earth solution, and stir to form a doped silica sol;
[0060] S3. Add 2g of pretreated iron phosphate powder to 15g of doped silica sol, stir and mix evenly, dry at 120℃ for 2h, calcine at 400℃ for 2h, grind for 1h to obtain silicon-doped iron phosphate powder.
[0061] S4. Add 1g of silicon-doped iron phosphate powder to 100mL of water, add 0.2g of sodium cetylbenzenesulfonate, stir and mix for 1h, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0062] Example 3
[0063] This embodiment provides a method for preparing a rust-proof and corrosion-resistant modified coating powder, including the following steps:
[0064] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0065] The plasma treatment conditions were: air flow rate of 65 mL / min, power of 350 W, vacuum degree of 500 Pa, and treatment time of 2100 s.
[0066] S2. Add 0.12g of lanthanum chloride to 8mL of water to obtain a rare earth solution; add 3g of tetraethyl orthosilicate and 0.15g of KOH to 60g of ethanol, add the rare earth solution, and stir to form a doped silica sol;
[0067] S3. Add 1.5g of pretreated iron phosphate powder to 12g of doped silica sol, stir and mix evenly, dry at 110℃ for 2h, calcine at 350℃ for 1.5h, and grind for 1h to obtain silicon-doped iron phosphate powder.
[0068] S4. Add 1g of silicon-doped iron phosphate powder to 100mL of water, add 0.15g of sodium dodecyl sulfonate, stir and mix for 1h, and dry to obtain rust-proof and corrosion-resistant modified coating powder. Figure 3 The infrared spectrum of the rust-proof and corrosion-resistant modified coating powder is shown.
[0069] Example 4
[0070] The difference compared to Example 3 is that step S4 is different, as follows:
[0071] 1 g of polyethylene glycol PEG400 was added to 100 mL of dichloromethane, followed by 20 mL of dichloromethane solution containing 0.2 g of sulfoxide. The mixture was stirred at room temperature for 1 h, and the solvent and unreacted sulfoxide were removed under reduced pressure to obtain chlorinated polyethylene glycol.
[0072] 1g of silicon-doped iron phosphate powder, 0.2g of chlorinated polyethylene glycol, and 0.5g of triethylamine were added to 150mL of acetone, heated under reflux and stirred for 3h, filtered, washed, and dried to obtain rust-proof and corrosion-resistant modified coating powder.
[0073] Example 5
[0074] The difference compared to Example 3 is that step S4 is different, as follows:
[0075] 1 g of polyethylene glycol PEG400 was added to 100 mL of dichloromethane, followed by 20 mL of dichloromethane solution containing 0.3 g of sulfoxide. The mixture was stirred at room temperature for 2 h, and the solvent and unreacted sulfoxide were removed under reduced pressure to obtain chlorinated polyethylene glycol.
[0076] 1g of silicon-doped iron phosphate powder, 0.2g of chlorinated polyethylene glycol, and 0.5g of triethylamine were added to 150mL of acetone, heated under reflux and stirred for 5h, filtered, washed, and dried to obtain rust-proof and corrosion-resistant modified coating powder.
[0077] Example 6
[0078] The difference compared to Example 3 is that step S4 is different, as follows:
[0079] 1 g of polyethylene glycol PEG400 was added to 100 mL of dichloromethane, followed by 20 mL of dichloromethane solution containing 0.25 g of sulfoxide. The mixture was stirred at room temperature for 1.5 h, and the solvent and unreacted sulfoxide were removed under reduced pressure to obtain chlorinated polyethylene glycol.
[0080] 1g of silicon-doped iron phosphate powder, 0.15g of chlorinated polyethylene glycol, and 0.4g of triethylamine were added to 150mL of acetone, heated under reflux and stirred for 4h, filtered, washed, and dried to obtain rust-proof and corrosion-resistant modified coating powder.
[0081] Example 7
[0082] The difference compared to Example 3 is that step S4 is different, as follows:
[0083] 1g of silicon-doped iron phosphate powder, 0.15g of 1-chlorooctadecane, and 0.3g of triethylamine were added to 150ml of acetonitrile. The mixture was heated under reflux and stirred for 3h. After filtration, washing, and drying, rust-proof and corrosion-resistant modified coating powder was obtained.
[0084] Example 8
[0085] The difference compared to Example 3 is that step S4 is different, as follows:
[0086] 1g of silicon-doped iron phosphate powder, 0.2g of 1-chlorohexadecane, and 0.5g of triethylamine were added to 150ml of acetonitrile. The mixture was heated under reflux and stirred for 5h. After filtration, washing, and drying, rust-proof and corrosion-resistant modified coating powder was obtained.
[0087] Example 9
[0088] The difference compared to Example 3 is that step S4 is different, as follows:
[0089] 1g of silicon-doped iron phosphate powder, 0.17g of 1-chlorododecane, and 0.4g of triethylamine were added to 150ml of acetonitrile. The mixture was heated under reflux and stirred for 4h. After filtration, washing, and drying, rust-proof and corrosion-resistant modified coating powder was obtained.
[0090] Comparative Example 1
[0091] The difference from Example 3 is that step S1 was not performed.
[0092] Includes the following steps:
[0093] S1. Add 0.12g of lanthanum chloride to 12mL of water to obtain a rare earth solution; add 3g of tetraethyl orthosilicate and 0.15g of KOH to 60g of ethanol, add the rare earth solution, and stir to form a doped silica sol;
[0094] S2. Add 1.5g of iron phosphate powder to 12g of doped silica sol, stir and mix evenly, dry at 110℃ for 2h, calcine at 350℃ for 1.5h, and grind for 1h to obtain silicon-doped iron phosphate powder.
[0095] S3. Add 1g of silicon-doped iron phosphate powder to 100mL of water, add 0.15g of sodium dodecyl sulfonate, stir and mix for 20min, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0096] Comparative Example 2
[0097] The difference from Example 3 is that lanthanum chloride was not added in step S2.
[0098] Includes the following steps:
[0099] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0100] The plasma treatment conditions were: air flow rate of 65 mL / min, power of 350 W, vacuum degree of 500 Pa, and treatment time of 2100 s.
[0101] S2. Add 3g of tetraethyl orthosilicate, 12mL of water, and 0.15g of KOH to 60g of ethanol, add rare earth solution, and stir to form silica sol;
[0102] S3. Add 1.5g of pretreated iron phosphate powder to 12g of silica sol, stir and mix evenly, dry at 110℃ for 2h, calcine at 350℃ for 1.5h, and grind for 1h to obtain silicon-coated iron phosphate powder.
[0103] S4. Add 1g of silicon-coated iron phosphate powder to 100mL of water, add 0.15g of sodium dodecyl sulfonate, stir and mix for 20min, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0104] Comparative Example 3
[0105] The difference from Example 3 is that steps S2 and S3 were not performed.
[0106] Includes the following steps:
[0107] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0108] The plasma treatment conditions were: air flow rate of 65 mL / min, power of 350 W, vacuum degree of 500 Pa, and treatment time of 2100 s.
[0109] S2. Add 1g of pretreated iron phosphate powder to 100mL of water, add 0.15g of sodium dodecyl sulfonate, stir and mix for 20min, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0110] Comparative Example 4
[0111] The difference from Example 6 is that steps S2 and S3 were not performed.
[0112] Includes the following steps:
[0113] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0114] The plasma treatment conditions were: air flow rate of 65 mL / min, power of 350 W, vacuum degree of 500 Pa, and treatment time of 2100 s.
[0115] S2. Add 1g of polyethylene glycol to 100mL of dichloromethane, add 20mL of dichloromethane solution containing 0.25g of sulfoxide, stir the reaction at room temperature for 1.5h, remove the solvent and unreacted sulfoxide under reduced pressure to obtain chlorinated polyethylene glycol.
[0116] 1g of pretreated iron phosphate powder, 0.15g of chlorinated polyethylene glycol, and 0.4g of triethylamine were added to 150mL of acetone, heated under reflux and stirred for 4h, filtered, washed, and dried to obtain rust-proof and corrosion-resistant modified coating powder.
[0117] Comparative Example 5
[0118] The difference from Example 9 is that steps S2 and S3 were not performed.
[0119] Includes the following steps:
[0120] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0121] The plasma treatment conditions were: air flow rate of 65 mL / min, power of 350 W, vacuum degree of 500 Pa, and treatment time of 2100 s.
[0122] S2. Add 1g of pretreated iron phosphate powder, 0.17g of 1-chlorododecane and 0.4g of triethylamine to 150ml of acetonitrile, heat under reflux and stir for 4h, filter, wash and dry to obtain rust-proof and corrosion-resistant modified coating powder.
[0123] Comparative Example 6
[0124] The difference from Example 3 is that step S4 was not performed.
[0125] Includes the following steps:
[0126] S1. The iron phosphate powder is subjected to plasma treatment using a VP-R10 plasma surface treatment instrument to obtain pretreated iron phosphate powder;
[0127] The plasma treatment conditions were: air flow rate of 65 mL / min, power of 350 W, vacuum degree of 500 Pa, and treatment time of 2100 s.
[0128] S2. Add 0.12g of lanthanum chloride to 12mL of water to obtain a rare earth solution; add 3g of tetraethyl orthosilicate and 0.15g of KOH to 60g of ethanol, add the rare earth solution, and stir to form a doped silica sol;
[0129] S3. Add 1.5g of pretreated iron phosphate powder to 12g of doped silica sol, stir and mix evenly, dry at 110℃ for 2h, calcine at 350℃ for 1.5h, and grind for 1h to obtain silicon-doped iron phosphate powder, which is the rust-proof and corrosion-proof modified coating powder.
[0130] Test Example 1
[0131] The rust-proof and corrosion-resistant modified coating powders prepared in Examples 1-3 and Comparative Examples 1-3 and 6 were added to WO6-1 waterborne alkyd primer to replace all the phosphate and zinc phosphate. Performance tests were conducted using commercially available WO6-1 waterborne alkyd primer as a comparison. The results are shown in Table 1.
[0132] Flexibility testing shall be conducted in accordance with GB / T1731-2020;
[0133] Impact resistance is tested using a paint film impact tester according to GB / T1732-2020;
[0134] Salt water resistance test shall be conducted in accordance with GB / T 10834-2008;
[0135] Acid resistance was tested according to the immersion method specified in GB / T9274-1988 "Determination of resistance to liquid media of paints and varnishes", with a sulfuric acid mass fraction of 5%, and defects were observed after immersion for 24 hours.
[0136] Table 1
[0137]
[0138] As shown in the table above, the rust-proof and corrosion-resistant modified coating powder prepared in Examples 1-3 of this invention, when added to WO6-1 waterborne alkyd primer to replace all phosphates and zinc phosphates, can improve the paint's impact resistance, flexibility, salt water resistance, and acid resistance.
[0139] Test Example 2
[0140] The rust-proof and corrosion-resistant modified coating powders prepared in Examples 4-6 and Comparative Examples 4 and 6 were added to H06-1 iron oxide red epoxy primer to replace all of the zinc chromate yellow. Performance tests were conducted using commercially available H06-1 iron oxide red epoxy primer as a comparison. The results are shown in Table 2.
[0141] Flexibility testing shall be conducted in accordance with GB / T1731-2020;
[0142] Impact resistance is tested using a paint film impact tester according to GB / T1732-2020;
[0143] Salt water resistance test shall be conducted in accordance with GB / T 10834-2008;
[0144] Acid resistance was tested according to the immersion method specified in GB / T9274-1988 "Determination of resistance to liquid media of paints and varnishes", with a sulfuric acid mass fraction of 5%, and defects were observed after immersion for 24 hours.
[0145] Table 2
[0146]
[0147] As shown in the table above, the rust-proof and corrosion-resistant modified coating powder prepared in Examples 4-6 of this invention can replace all zinc chromate yellow when added to H06-1 iron oxide red epoxy primer, thereby improving the paint's impact resistance, flexibility, and resistance to salt water and acid.
[0148] Test Example 3
[0149] The rust-proof and corrosion-resistant modified coating powders prepared in Examples 7-9 and Comparative Examples 5 and 6 were added to C06-2 long-oil iron oxide alkyd primer to replace all of the zinc phosphate. Performance tests were conducted using C06-2 long-oil iron oxide alkyd primer as a control. The results are shown in Table 3.
[0150] Flexibility testing shall be conducted in accordance with GB / T1731-2020;
[0151] Impact resistance is tested using a paint film impact tester according to GB / T1732-2020;
[0152] Salt water resistance test shall be conducted in accordance with GB / T 10834-2008;
[0153] Acid resistance was tested according to the immersion method specified in GB / T9274-1988 "Determination of resistance to liquid media of paints and varnishes", with a sulfuric acid mass fraction of 5%, and defects were observed after immersion for 24 hours.
[0154] Table 3
[0155]
[0156] As shown in the table above, the rust-proof and corrosion-resistant modified coating powder prepared in Examples 7-9 of this invention, when combined with CO6-2 long-oil iron oxide alkyd primer to replace all zinc phosphate, improves the paint's impact resistance, flexibility, and resistance to salt water and acid.
[0157] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for preparing a rust-proof and corrosion-resistant modified coating powder, characterized in that, Includes the following steps: S1. Ferric phosphate powder is subjected to plasma treatment to obtain pretreated ferric phosphate powder; S2. Add rare earth salts to water to obtain a rare earth solution; Alkyl orthosilicate and alkali are added to ethanol, followed by rare earth solution, and stirred to form a doped silica sol. The mass ratio of rare earth salt, water, alkyl orthosilicate, alkali and ethanol is 0.1-0.15:7-10:2-4:0.1-0.2:50-70. S3. Add the pretreated iron phosphate powder to the doped silica sol, stir and mix evenly, dry, calcine, and grind to obtain silicon-coated iron phosphate powder. The mass ratio of the pretreated iron phosphate powder to the doped silica sol is 1-2:10-15. S4. React silicon-doped iron phosphate powder with chlorinated polyethylene glycol, haloalkanes, or surfactants to obtain rust-proof and corrosion-resistant modified coating powder.
2. The preparation method according to claim 1, characterized in that, The reaction with the surfactant in step S4 is as follows: Add silicon-doped iron phosphate powder to water, add surfactant, stir and mix evenly, and dry to obtain rust-proof and corrosion-resistant modified coating powder.
3. The preparation method according to claim 1, characterized in that, The reaction with chlorinated polyethylene glycol in step S4 is as follows: Chlorinated polyethylene glycol was prepared by reacting polyethylene glycol with thionyl chloride. Silicon-doped iron phosphate powder and chlorinated polyethylene glycol were reacted under the action of an acid-binding agent to obtain a rust-proof and corrosion-resistant modified coating powder.
4. The preparation method according to claim 1, characterized in that, The reaction with haloalkane in step S4 is as follows: Silicon-doped iron phosphate powder and haloalkanes were reacted under the action of an acid-binding agent to obtain a rust-proof and corrosion-resistant modified coating powder.
5. The preparation method according to claim 1, characterized in that, The plasma treatment conditions in step S1 are: air flow rate of 50-80 mL / min, power of 300-400 W, vacuum degree of 400-600 Pa, and treatment time of 1800-2400 s.
6. The preparation method according to claim 1, characterized in that, The rare earth salt in step S2 is selected from at least one of lanthanum nitrate, lanthanum chloride, cerium nitrate, and cerium chloride; the alkyl orthosilicate is methyl or ethyl orthosilicate; and the base is NaOH or KOH.
7. The preparation method according to claim 1, characterized in that, The drying temperature in step S3 is 100-120℃, and the calcination temperature is 300-400℃ for 1-2 hours.
8. A rust-proof and corrosion-resistant modified coating powder prepared by the preparation method according to any one of claims 1-7.
9. The application of the rust-proof and corrosion-resistant modified coating powder as described in claim 8 in pigments.