A corrosion-resistant water-based alkyd paint, preparation method and application thereof
By preparing corrosion-resistant water-based alkyd paint, using components such as water-based alkyd resin and modified barium sulfate, the problems of VOC emissions and fire risks in traditional solvent-based steel cylinder paints are solved, and efficient and environmentally friendly coating performance is achieved.
Patent Information
- Application Number
- CN202411848350.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-04-04
AI Technical Summary
Traditional solvent-based cylinder paint contains a high proportion of volatile organic compounds (VOC), which leads to environmental pollution, safety hazards and high fire risks, and poses a threat to the health of operators.
A corrosion-resistant water-based alkyd paint is prepared, and a combination of aqueous alkyd resin, modified barium sulfate, cosolvent, water, dispersant and triethylamine is used to form a stable coating formula using stirring dispersion and reflux esterification.
It reduces VOC emissions, improves the corrosion resistance and adhesion of the paint layer, reduces the use of cosolvents, reduces the production cost, and improves the storage stability of the paint layer.
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Abstract
Description
Technical Field
[0001] The invention relates to a corrosion-resistant water-based alkyd paint, a preparation method and application thereof. Background Art
[0002] In recent years, with the improvement of global environmental awareness and the increasingly stringent regulations, traditional solvent-based coatings have gradually been restricted due to the high proportion of volatile organic compounds (VOCs), the negative impact on the environment during production, transportation, storage and use, and the potential safety hazards. Especially in the field of steel cylinder coating, traditional oil-based steel cylinder paint mainly uses oil-based alkyd resin as a film-forming substance, and is supplemented with various additives, pigments, fillers, solvents and other ingredients.
[0003] In order to achieve the appropriate construction viscosity, traditional solvent-based cylinder paints require a large amount of organic solvents to be added, which results in higher VOC emissions. And due to the high solvent content, the flash point of traditional paints is low, which increases the risk of fire during production and use, and also poses a threat to the health of operators.
[0004] Therefore, the inventors prepared a corrosion-resistant water-based alkyd paint to solve the above problems. Summary of the invention
[0005] The purpose of the present invention is to provide a corrosion-resistant water-based alkyd paint, a preparation method and application thereof, so as to solve the technical problems mentioned in the above background technology.
[0006] The technical scheme for achieving the purpose of the present invention is: a corrosion-resistant water-based alkyd paint, wherein the raw material components include, by weight, 450-470 parts by weight of water-based alkyd resin, 30-60 parts by weight of pigment and filler, 10-20 parts by weight of cosolvent, 14-16 parts by weight of neutralizer, 13-15 parts by weight of drying agent, 140-160 parts by weight of water, 1.5-2.5 parts by weight of dispersant, and 10-15 parts by weight of triethylamine.
[0007] Furthermore, the water-based alkyd resin is obtained by reacting linseed oil, pentaerythritol, trimellitic anhydride, phthalic anhydride, benzoic acid, oleic acid and maleic anhydride.
[0008] Furthermore, the pigments and fillers are selected from one or more combinations of titanium dioxide, carbon black, red iron oxide, permanent red, permanent yellow, iron titanium powder, aqueous silver paste, BGS phthalocyanine blue, phthalocyanine green, barium sulfate, bentonite, mica iron oxide, sericite, mica powder, nano zinc oxide, diatomaceous earth, quartz sand, and talc.
[0009] Furthermore, the drying agent is the drying agent 822-1.
[0010] A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 450-470 parts by mass of water-based alkyd resin, 10-20 parts by mass of cosolvent, 140-160 parts by mass of water, 1.5-2.5 parts by mass of dispersant, and 10-15 parts by mass of triethylamine are stirred and dispersed at 400-600 r / min for 4-6 minutes, then 30-60 parts by mass of pigments and fillers are added, stirring is continued for 9-11 minutes, 13-15 parts by mass of drying agent are added, and stirring is continued for 20-40 minutes to obtain a corrosion-resistant water-based alkyd paint.
[0011] Further, the preparation steps of the waterborne alkyd resin are as follows: 300-350 parts by mass of linseed oil are added to a reactor, the temperature is raised to 75-85°C under stirring conditions, 15-25 parts by mass of pentaerythritol and 100-110 parts by mass of trimellitic anhydride are added, the temperature is continued to be raised to 125-135°C, 0.08-0.12 parts by mass of lithium hydroxide are added, the temperature is raised to 235-245°C and the reaction is kept warm for 50-70 minutes, then the temperature is lowered to below 200°C, 110-120 parts by mass of phthalic anhydride, 25-30 parts by mass of benzoic acid, and 30-40 parts by mass of toluene are added, the temperature is then raised to 200-220°C for reflux esterification, and when the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 30-40 parts by mass of trimellitic anhydride and 46-50 parts by mass of toluene are added, the temperature is raised to 160-170°C, and the temperature is refluxed until the acid value is not more than 50 mg / g, add 45-55 parts by mass of maleic anhydride, then raise the temperature to 210-230°C and keep the temperature for reaction for 9-11 hours, cool to 95-105°C, add 22-26 parts by mass of triethylamine, stir evenly, and obtain a water-based alkyd resin.
[0012] Furthermore, the pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 14-16 parts by mass of 2-hydroxyoleic acid and 1-3 parts by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 80-90°C for 3-6 hours to obtain 2-hydroxy sodium oleate; 1.5-2 parts by mass of anhydrous sodium sulfate are dissolved in 100 parts by mass of deionized water, heated to 80°C with stirring, 0.18-0.22 parts by mass of 2-hydroxy sodium oleate are added, and barium sulfide is added after stirring until it is completely dissolved, and the mixture is kept warm for reaction for 1-4 hours, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 3-5 μm.
[0013] Furthermore, the dispersant is dispersant 904s.
[0014] The invention discloses an application of a corrosion-resistant water-based alkyd paint, wherein the corrosion-resistant water-based alkyd paint is applied to a steel cylinder.
[0015] By adopting the above technical solution, the present invention has the following beneficial effects: The corrosion-resistant water-based alkyd paint of the present invention comprises, by weight, raw material components including 450-470 parts by weight of water-based alkyd resin, 30-60 parts by weight of pigments and fillers, 10-20 parts by weight of cosolvents, 14-16 parts by weight of neutralizers, 13-15 parts by weight of driers, 140-160 parts by weight of water, 1.5-2.5 parts by weight of dispersants, and 10-15 parts by weight of triethylamine; wherein the water-based alkyd resin is obtained by reacting linseed oil, pentaerythritol, trimellitic anhydride, phthalic anhydride, benzoic acid, oleic acid, and maleic anhydride; and the pigments and fillers are barium sulfate modified by 2-hydroxyoleic acid.
[0016] The water-based alkyd resin of the invention is obtained by reacting linseed oil, pentaerythritol, trimellitic anhydride, phthalic anhydride, benzoic acid and maleic anhydride; maleic anhydride is introduced into the water-based alkyd resin to increase polar carboxyl functional groups, thereby enhancing the interaction between the resin and water molecules, making the coating formula more stable and easy to disperse in water, reducing the amount of co-solvent used and reducing the production cost.
[0017] The barium sulfate modified by 2-hydroxyoleic acid can, on the one hand, improve the dispersibility of barium sulfate in corrosion-resistant water-based alkyd paint; on the other hand, when the corrosion-resistant water-based alkyd paint is used, the oleic acid on the surface of the modified barium sulfate reacts with the maleic anhydride in the water-based alkyd resin to uniformly disperse the modified barium sulfate in the water-based alkyd resin, and the barium sulfate is chemically adsorbed on the surface of the metal substrate through the carboxyl group in the water-based alkyd resin to form a dense adsorption film layer, thereby increasing the corrosion resistance of the corrosion-resistant water-based alkyd paint. DETAILED DESCRIPTION
[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.
[0019] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.
[0020] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.
[0021] Some of the raw materials of the examples and comparative examples are as follows: the drying agent is the drying agent 822-1; the dispersant is the dispersant 904s; the co-solvent is ethylene glycol butyl ether, and the neutralizer is triethylamine.
[0022] (Example 1) A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 450 parts by mass of water-based alkyd resin, 10 parts by mass of cosolvent, 140 parts by mass of water, 1.5 parts by mass of dispersant, and 10 parts by mass of triethylamine were stirred and dispersed at 400 r / min for 4 minutes, then 30 parts by mass of pigments and fillers were added, stirring was continued for 9 minutes, 13 parts by mass of drying agent were added, and stirring was continued for 20 minutes to obtain a corrosion-resistant water-based alkyd paint.
[0023] The preparation steps of the waterborne alkyd resin are as follows: 300 parts by weight of linseed oil are added into a reactor, the temperature is raised to 75°C under stirring, 15 parts by weight of pentaerythritol and 100 parts by weight of trimellitic anhydride are added, the temperature is further raised to 125°C, 0.08 parts by weight of lithium hydroxide is added, the temperature is raised to 235°C for heat preservation and reaction for 50 minutes, the temperature is then lowered to below 200°C, 110 parts by weight of phthalic anhydride, 25 parts by weight of benzoic acid, and 30 parts by weight of toluene are added, the temperature is then raised to 200°C for reflux esterification, and when the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 30 parts by weight of trimellitic anhydride and 46 parts by weight of toluene are added, the temperature is then raised to 160°C, refluxed until the acid value is not more than 50 mg / g, 45 parts by weight of maleic anhydride are added, the temperature is then raised to 210°C for heat preservation and reaction for 9 hours, the temperature is lowered to 95°C, 22 parts by weight of triethylamine are added, and the temperature is uniformly stirred to obtain a waterborne alkyd resin.
[0024] The pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 14 parts by mass of 2-hydroxyoleic acid and 1 part by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 80°C for 3 hours to obtain 2-hydroxy sodium oleate; 1.5 parts by mass of anhydrous sodium sulfate is dissolved in 100 parts by mass of deionized water, heated to 80°C with stirring, 0.18 parts by mass of 2-hydroxy sodium oleate is added, and barium sulfide is added after stirring until it is completely dissolved, and the mixture is kept warm for reaction for 1 hour, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 3 μm.
[0025] (Example 2) A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 460 parts by mass of water-based alkyd resin, 15 parts by mass of cosolvent, 150 parts by mass of water, 2 parts by mass of dispersant, and 13 parts by mass of triethylamine were stirred and dispersed at 500 r / min for 5 minutes, then 45 parts by mass of pigments and fillers were added, stirring was continued for 10 minutes, 14 parts by mass of drying agent were added, and stirring was continued for 30 minutes to obtain corrosion-resistant water-based alkyd paint.
[0026] The preparation steps of the waterborne alkyd resin are as follows: 330 parts by weight of linseed oil are added into a reactor, the temperature is raised to 80°C under stirring, 20 parts by weight of pentaerythritol and 105 parts by weight of trimellitic anhydride are added, the temperature is further raised to 130°C, 0.1 parts by weight of lithium hydroxide is added, the temperature is raised to 240°C for heat preservation and reaction for 60 minutes, the temperature is then lowered to below 200°C, 115 parts by weight of phthalic anhydride, 28 parts by weight of benzoic acid and 35 parts by weight of toluene are added, the temperature is then raised to 210°C for reflux esterification until the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 35 parts by weight of trimellitic anhydride and 48 parts by weight of toluene are added, the temperature is then raised to 165°C, the temperature is refluxed until the acid value is not more than 50 mg / g, 50 parts by weight of maleic anhydride are added, the temperature is then raised to 220°C for heat preservation and reaction for 10 hours, the temperature is lowered to 100°C, 24 parts by weight of triethylamine are added, and the temperature is uniformly stirred to obtain a waterborne alkyd resin.
[0027] The pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 15 parts by mass of 2-hydroxyoleic acid and 2 parts by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 85°C for 4 hours to obtain 2-hydroxy sodium oleate; 1.8 parts by mass of anhydrous sodium sulfate is dissolved in 100 parts by mass of deionized water, heated to 80°C with stirring, 0.2 parts by mass of 2-hydroxy sodium oleate is added, and barium sulfide is added after stirring until it is completely dissolved, and the mixture is kept warm for reaction for 2.5 hours, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 4 μm.
[0028] (Example 3) A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 470 parts by mass of water-based alkyd resin, 20 parts by mass of cosolvent, 160 parts by mass of water, 2.5 parts by mass of dispersant, and 15 parts by mass of triethylamine were stirred and dispersed at 600 r / min for 6 minutes, then 60 parts by mass of pigments and fillers were added, stirring was continued for 11 minutes, 15 parts by mass of drying agent were added, and stirring was continued for 40 minutes to obtain corrosion-resistant water-based alkyd paint.
[0029] The preparation steps of the waterborne alkyd resin are as follows: 350 parts by weight of linseed oil is added into a reactor, the temperature is raised to 85°C under stirring, 25 parts by weight of pentaerythritol and 110 parts by weight of trimellitic anhydride are added, the temperature is further raised to 135°C, 0.12 parts by weight of lithium hydroxide is added, the temperature is raised to 245°C for heat preservation and reaction for 70 minutes, the temperature is then lowered to below 200°C, 120 parts by weight of phthalic anhydride, 30 parts by weight of benzoic acid and 40 parts by weight of toluene are added, the temperature is then raised to 220°C for reflux esterification, and when the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 40 parts by weight of trimellitic anhydride and 50 parts by weight of toluene are added, the temperature is then raised to 170°C, refluxed until the acid value is not more than 50 mg / g, 55 parts by weight of maleic anhydride are added, the temperature is then raised to 230°C for heat preservation and reaction for 11 hours, the temperature is lowered to 105°C, 26 parts by weight of triethylamine are added, and the waterborne alkyd resin is obtained.
[0030] The pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 16 parts by mass of 2-hydroxyoleic acid and 3 parts by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 90° C. for 6 hours to obtain 2-hydroxy sodium oleate; 2 parts by mass of anhydrous sodium sulfate are dissolved in 100 parts by mass of deionized water, heated to 80° C. with stirring, 0.22 parts by mass of 2-hydroxy sodium oleate are added, and barium sulfide is added after stirring until the mixture is completely dissolved, and the mixture is kept warm for reaction for 4 hours, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 5 μm.
[0031] (Comparative Example 1) A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 460 parts by mass of water-based alkyd resin, 15 parts by mass of cosolvent, 150 parts by mass of water, 2 parts by mass of dispersant, and 13 parts by mass of triethylamine were stirred and dispersed at 500 r / min for 5 minutes, then 45 parts by mass of pigments and fillers were added, stirring was continued for 10 minutes, 14 parts by mass of drying agent were added, and stirring was continued for 30 minutes to obtain corrosion-resistant water-based alkyd paint.
[0032] The preparation steps of the waterborne alkyd resin are as follows: 330 parts by weight of linseed oil are added into a reaction kettle, the temperature is raised to 80°C under stirring, 20 parts by weight of pentaerythritol and 105 parts by weight of trimellitic anhydride are added, the temperature is further raised to 130°C, 0.1 parts by weight of lithium hydroxide is added, the temperature is raised to 240°C for heat preservation and reaction for 60 minutes, the temperature is then lowered to below 200°C, 115 parts by weight of phthalic anhydride, 28 parts by weight of benzoic acid and 35 parts by weight of toluene are added, the temperature is then raised to 210°C for reflux esterification until the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 35 parts by weight of trimellitic anhydride and 48 parts by weight of toluene are added, the temperature is raised to 165°C, the temperature is refluxed until the acid value is not more than 50 mg / g, the temperature is lowered to 100°C, 24 parts by weight of triethylamine are added, and the temperature is uniformly stirred to obtain a waterborne alkyd resin.
[0033] The pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 15 parts by mass of 2-hydroxyoleic acid and 2 parts by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 85°C for 4 hours to obtain 2-hydroxy sodium oleate; 1.8 parts by mass of anhydrous sodium sulfate is dissolved in 100 parts by mass of deionized water, heated to 80°C with stirring, 0.2 parts by mass of 2-hydroxy sodium oleate is added, and barium sulfide is added after stirring until it is completely dissolved, and the mixture is kept warm for reaction for 2.5 hours, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 4 μm.
[0034] (Comparative Example 2) A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 460 parts by mass of water-based alkyd resin, 15 parts by mass of cosolvent, 150 parts by mass of water, 2 parts by mass of dispersant, and 13 parts by mass of triethylamine were stirred and dispersed at 500 r / min for 5 minutes, then 45 parts by mass of pigments and fillers were added, stirring was continued for 10 minutes, 14 parts by mass of drying agent were added, and stirring was continued for 30 minutes to obtain corrosion-resistant water-based alkyd paint.
[0035] The preparation steps of the waterborne alkyd resin are as follows: 330 parts by mass of linseed oil are added into a reaction kettle, the temperature is raised to 80°C under stirring, 20 parts by mass of pentaerythritol and 105 parts by mass of trimellitic anhydride are added, the temperature is further raised to 130°C, 0.1 parts by mass of lithium hydroxide is added, the temperature is raised to 240°C for heat preservation reaction for 60 minutes, the temperature is then lowered to below 200°C, 115 parts by mass of phthalic anhydride, 28 parts by mass of benzoic acid and 35 parts by mass of toluene are added, the temperature is then raised to 210°C for reflux esterification until the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 35 parts by mass of trimellitic anhydride and 48 parts by mass of toluene are added, the temperature is raised to 165°C, the temperature is refluxed until the acid value is not more than 50 mg / g, 50 parts by mass of maleic anhydride are added, the temperature is lowered to 100°C, 24 parts by mass of triethylamine are added, and the temperature is uniformly stirred to obtain a waterborne alkyd resin.
[0036] The pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 15 parts by mass of 2-hydroxyoleic acid and 2 parts by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 85°C for 4 hours to obtain 2-hydroxy sodium oleate; 1.8 parts by mass of anhydrous sodium sulfate is dissolved in 100 parts by mass of deionized water, heated to 80°C with stirring, 0.2 parts by mass of 2-hydroxy sodium oleate is added, and barium sulfide is added after stirring until it is completely dissolved, and the mixture is kept warm for reaction for 2.5 hours, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 4 μm.
[0037] (Comparative Example 3) A method for preparing a corrosion-resistant water-based alkyd paint comprises the following preparation steps: 460 parts by mass of water-based alkyd resin, 15 parts by mass of cosolvent, 150 parts by mass of water, 2 parts by mass of dispersant, and 13 parts by mass of triethylamine were stirred and dispersed at 500 r / min for 5 minutes, then 45 parts by mass of pigments and fillers were added, stirring was continued for 10 minutes, 14 parts by mass of drying agent were added, and stirring was continued for 30 minutes to obtain corrosion-resistant water-based alkyd paint.
[0038] The preparation steps of the waterborne alkyd resin are as follows: 330 parts by weight of linseed oil are added into a reactor, the temperature is raised to 80°C under stirring, 20 parts by weight of pentaerythritol and 105 parts by weight of trimellitic anhydride are added, the temperature is further raised to 130°C, 0.1 parts by weight of lithium hydroxide is added, the temperature is raised to 240°C for heat preservation and reaction for 60 minutes, the temperature is then lowered to below 200°C, 115 parts by weight of phthalic anhydride, 28 parts by weight of benzoic acid and 35 parts by weight of toluene are added, the temperature is then raised to 210°C for reflux esterification until the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 35 parts by weight of trimellitic anhydride and 48 parts by weight of toluene are added, the temperature is then raised to 165°C, the temperature is refluxed until the acid value is not more than 50 mg / g, 50 parts by weight of maleic anhydride are added, the temperature is then raised to 220°C for heat preservation and reaction for 10 hours, the temperature is lowered to 100°C, 24 parts by weight of triethylamine are added, and the temperature is uniformly stirred to obtain a waterborne alkyd resin.
[0039] The pigment filler is barium sulfate with a particle size of 4 μm.
[0040] Effect example The corrosion-resistant water-based alkyd paint prepared in the examples and comparative examples was applied to the surface of the tinplate to form a paint layer of 30 μm thick, and then dried at 200-220° C. for 2 h to obtain a corrosion-resistant water-based alkyd paint layer.
[0041] Adhesion grade test: GB / T1720 is used as the reference standard, the cross-cut method is used to test the adhesion of the sample, and the adhesion grade is taken as the test standard.
[0042] Corrosion resistance test: GB / T1771 is used as the reference standard to test the corrosion resistance of the corrosion-resistant water-based alkyd paint layer.
[0043] Storage stability: Put about 0.5 L of the corrosion-resistant water-based alkyd paint prepared in the examples and comparative examples into a plastic or glass container, with no less than 10% of the space in the container. After sealing, dry at 50 ± 2 °C for 14 days, and then stand at room temperature for 3 hours. Observe whether there is any abnormality. The following Table 1 shows the performance results of the corrosion-resistant water-based alkyd paints prepared in the examples and comparative examples: Table 1
[0044] As shown in Table 1 above, compared with the comparative example, the corrosion-resistant water-based alkyd paint layer prepared in the example has better corrosion resistance, adhesion and storage stability.
[0045] Comparison of Comparative Example 1 with Example 2: No maleic anhydride was added to the waterborne alkyd resin in Comparative Example 1, and the corrosion-resistant waterborne alkyd paint prepared in Example 2 had better corrosion resistance, adhesion and storage stability.
[0046] Comparative Example 2 is compared with Example 2. After adding maleic anhydride to the water-based alkyd resin in Comparative Example 2, the temperature is not raised to 220°C for insulation reaction. The corrosion-resistant water-based alkyd paint prepared in Example 2 has good corrosion resistance and storage stability. The maleic anhydride in Comparative Example 2 is not grafted onto the water-based alkyd resin. When the amount of co-solvent added is lower than the required amount, the water-based alkyd resin has poor compatibility with water and is easy to stratify, and cannot be cross-linked with modified barium sulfate to form a dense film layer, affecting the anti-corrosion performance.
[0047] Comparative Example 3 is compared with Example 2. The pigment filler in Comparative Example 3 only uses barium sulfate with a particle size of 4 μm. The corrosion-resistant water-based alkyd paint prepared in Example 2 has good corrosion resistance, adhesion and storage stability. The barium sulfate in Comparative Example 3 has poor dispersibility and cannot cross-link with the water-based alkyd resin to form a dense film layer.
[0048] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific 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 in the protection scope of the present invention.
Claims
1. A corrosion-resistant water-based alkyd paint, characterized in that: In terms of weight, the raw material components include 450-470 parts by weight of water-based alkyd resin, 30-60 parts by weight of pigments and fillers, 10-20 parts by weight of co-solvents, 14-16 parts by weight of neutralizers, 13-15 parts by weight of drying agents, 140-160 parts by weight of water, 1.5-2.5 parts by weight of dispersants, and 10-15 parts by weight of triethylamine.
2. The corrosion-resistant water-based alkyd paint according to claim 1, characterized in that: The water-based alkyd resin is obtained by reacting linseed oil, pentaerythritol, trimellitic anhydride, phthalic anhydride, benzoic acid, oleic acid and maleic anhydride.
3. The corrosion-resistant water-based alkyd paint according to claim 1, characterized in that: The pigment and filler are selected from one or more combinations of titanium dioxide, carbon black, red iron oxide, permanent red, permanent yellow, iron titanium powder, aqueous silver paste, BGS phthalocyanine blue, phthalocyanine green, barium sulfate, bentonite, mica iron oxide, sericite, mica powder, nano zinc oxide, diatomaceous earth, quartz sand, and talc.
4. The corrosion-resistant water-based alkyd paint according to claim 1, characterized in that: The drying agent is drying agent 822-1.
5. A method for preparing a corrosion-resistant water-based alkyd paint, characterized in that: The method comprises the following preparation steps: 450-470 parts by mass of water-based alkyd resin, 10-20 parts by mass of cosolvent, 140-160 parts by mass of water, 1.5-2.5 parts by mass of dispersant, and 10-15 parts by mass of triethylamine are stirred and dispersed at 400-600 r / min for 4-6 minutes, then 30-60 parts by mass of pigments and fillers are added, stirring is continued for 9-11 minutes, 13-15 parts by mass of drying agent are added, and stirring is continued for 20-40 minutes to obtain a corrosion-resistant water-based alkyd paint.
6. The method for preparing the corrosion-resistant water-based alkyd paint according to claim 5, characterized in that: The preparation steps of the waterborne alkyd resin are as follows: 300-350 parts by weight of linseed oil are added to a reactor, the temperature is raised to 75-85°C under stirring conditions, 15-25 parts by weight of pentaerythritol and 100-110 parts by weight of trimellitic anhydride are added, the temperature is continued to be raised to 125-135°C, 0.08-0.12 parts by weight of lithium hydroxide are added, the temperature is raised to 235-245°C for heat preservation and reaction for 50-70 minutes, then the temperature is lowered to below 200°C, 110-120 parts by weight of phthalic anhydride, 25-30 parts by weight of benzoic acid, and 30-40 parts by weight of toluene are added, the temperature is then raised to 200-220°C for reflux esterification, and when the acid value is not more than 4 mg / g, the temperature is lowered to below 180°C, 30-40 parts by weight of trimellitic anhydride and 46-50 parts by weight of toluene are added, the temperature is raised to 160-170°C, and the temperature is refluxed until the acid value is not more than 50 mg / g , add 45-55 parts by mass of maleic anhydride, then raise the temperature to 210-230°C and keep the reaction for 9-11 hours, cool to 95-105°C, add 22-26 parts by mass of triethylamine, stir evenly, and obtain a water-based alkyd resin.
7. The method for preparing the corrosion-resistant water-based alkyd paint according to claim 6, characterized in that: The pigment and filler adopts modified barium sulfate; the preparation steps of the modified barium sulfate are as follows: 14-16 parts by mass of 2-hydroxyoleic acid and 1-3 parts by mass of sodium hydroxide are added to 100 parts by mass of anhydrous ethanol, and the mixture is reacted at 80-90° C. for 3-6 hours to obtain 2-hydroxy sodium oleate; 1.5-2 parts by mass of anhydrous sodium sulfate are dissolved in 100 parts by mass of deionized water, heated to 80° C. with stirring, 0.18-0.22 parts by mass of 2-hydroxy sodium oleate are added, barium sulfide is added after stirring until completely dissolved, the mixture is kept warm for reaction for 1-4 hours, filtered, washed, dried, and ground to obtain modified barium sulfate with a particle size of 3-5 μm.
8. The method for preparing the corrosion-resistant water-based alkyd paint according to claim 6, characterized in that: The dispersant used is dispersant 904s.
9. An application of a corrosion-resistant water-based alkyd paint, characterized in that: The corrosion-resistant water-based alkyd paint is applied as an anti-corrosion paint on the surface of the steel cylinder.