Formula and preparation method of acrylic resin for bio-based grease modified anticorrosive paint

Abstract

The invention relates to the technical field of preparation of acrylic resin, and discloses a formula of acrylic resin for bio-based grease modified anticorrosive paint and a preparation method of the acrylic resin. The formula of the acrylic resin for the bio-based grease modified anticorrosive paint is prepared from the following raw materials in parts by weight: 890 to 910 parts of a polyester intermediate, 115 to 125 parts of xylene, 430 to 450 parts of styrene, 28 to 32 parts of methyl methacrylate, 32 to 34 parts of butyl acrylate, 15 to 17 parts of hydroxyethyl acrylate and 22 to 24 parts of a catalyst, according to the invention, by introducing a polyester intermediate, especially using cottonseed oleic acid and pentaerythritol, a long-chain aliphatic structure and more cross-linking points are provided for a polymer chain, so that the network structure of the coating is enhanced, the hardness of the coating is improved, in addition, by adding styrene, the hardness of the coating is increased, a rigid benzene ring structure is also provided, and the hardness of the coating is improved. The mechanical strength of the coating is further enhanced, and the hardness of the coating is improved.

Description

Technical Field

[0001] The invention relates to the technical field of acrylic resin preparation, and in particular to an acrylic resin formula for bio-based grease-modified anticorrosive coatings and a preparation method thereof. Background Art

[0002] Bio-based oil-modified anti-corrosion coatings are a type of coating that uses vegetable oils and other renewable biomass resources as raw materials, is converted into high-molecular polymers through chemical or biotechnology, and is further processed into coating products with anti-corrosion properties. This type of coating not only meets the requirements of environmental protection and sustainable development, but also shows great potential in providing excellent physical properties. A notable feature of bio-based oil-modified anti-corrosion coatings is their environmental friendliness. This type of coating uses vegetable oils such as soybean oil and castor oil as raw materials. These materials are renewable and release fewer volatile organic compounds (VOCs) during production and use, which is beneficial to reducing environmental pollution. Specially modified bio-based oils can provide good waterproof and anti-corrosion properties, and acrylic resin is one of the key ingredients for manufacturing bio-based oil-modified anti-corrosion coatings, which has a decisive influence on the performance of the coating. Through the research and application of acrylic resin, high-performance coatings that meet different needs can be prepared.

[0003] The acrylic resin used in the prior art for bio-based grease-modified anticorrosive coatings also has the following defects:

[0004] 1. Traditional acrylic resin coatings have insufficient hardness after film formation and it is difficult to achieve a high level of hardness, which limits the application range of the coating, especially in situations where wear resistance and scratch resistance are required.

[0005] 2. Although traditional acrylic resin coatings have good film-forming properties and adhesion, they may not perform well in terms of water resistance. Water penetration can easily cause the coating to blister, peel or lose adhesion, thereby shortening the service life of the coating. Summary of the invention

[0006] In view of the problems existing in the prior art, an acrylic resin formula for bio-based grease-modified anti-corrosion coatings and a preparation method thereof are proposed.

[0007] The technical scheme of the present invention is as follows: the present invention provides an acrylic resin formula for bio-based oil-modified anti-corrosion coatings, which is composed of the following raw materials in parts by weight: 890-910 parts of polyester intermediate, 115-125 parts of xylene, 430-450 parts of styrene, 28-32 parts of methyl methacrylate, 32-34 parts of butyl acrylate, 15-17 parts of hydroxyethyl acrylate and 22-24 parts of catalyst;

[0008] The formulation of the polyester intermediate consists of the following raw materials in parts by weight: 520-540 parts of cottonseed oil fatty acid, 190-210 parts of glycerol, 230-250 parts of phthalic anhydride, 35-45 parts of pentaerythritol, 65-75 parts of benzoic acid, and 880-920 parts of xylene.

[0009] Further, the glycerol used is glycerol with a purity of 99.5%.

[0010] Further, the pentaerythritol used is pentaerythritol with a purity of 95%.

[0011] Further, the present invention also provides a preparation method of an acrylic resin for a bio-based oil-modified anticorrosive coating, and the method steps are as follows:

[0012] S1: Prepare the polyester intermediate;

[0013] S2: Add the prepared polyester intermediate and xylene into a reaction kettle;

[0014] S3: Add styrene, methyl methacrylate, butyl acrylate, and 2-hydroxyethyl acrylate into the reaction kettle;

[0015] S4: Conduct a polymerization reaction in the reaction kettle;

[0016] S5: Add a catalyst into the reaction kettle for reaction;

[0017] S6: Remove the residual solvent and unreacted monomers.

[0018] Further, in the said S1, the preparation method steps of the polyester intermediate are as follows:

[0019] Step 1: Clean and assemble the reaction kettle, configure a temperature controller and a stirrer to ensure normal operation, and prepare an inert gas supply system to protect the reaction system;

[0020] Step 2: Add 520-540 parts of cottonseed oil fatty acid into the reaction kettle, slowly add 190-210 parts of glycerol with a purity of 99.5% using a dropping funnel, start the stirrer at the same time for low-speed stirring, then gradually add 230-250 parts of phthalic anhydride, continue stirring, and then add 35-45 parts of 95% pentaerythritol, keep the temperature controlled at 60-70 °C, gradually add 65-75 parts of benzoic acid, and maintain continuous stirring. Finally, add 880-920 parts of xylene and stir evenly;

[0021] Step 3: Raise the temperature of the reaction kettle to 180-200 °C and maintain it within the temperature range of 180-200 °C to make the reactants start the esterification reaction, maintain stirring to ensure that the reactants are evenly mixed, the reaction time is 4-6 hours, and use a pH meter to monitor the pH value of the reaction mixture to ensure that it is within the neutral range;

[0022] Step 4: As the reaction proceeds, use a vacuum system to gradually remove the generated water and unreacted low-boiling substances, and recover the evaporated solvent and substances through a condenser.

[0023] Step 5: After the reaction is completed, gradually lower the temperature of the reaction kettle to room temperature, and adjust the viscosity and composition ratio of the final product as needed to ensure that the polyester intermediate meets the predetermined formulation requirements.

[0024] Step 6: Filter the final product through a filter to remove possible solid impurities, and store the filtered polyester intermediate in a dry and cool environment for later use.

[0025] Further, in S2, add 890 - 910 parts of polyester intermediate and 115 - 125 parts of xylene into the reaction kettle, start the stirrer, and stir at a low speed to ensure uniform mixing.

[0026] Further, in S3, slowly add 430 - 450 parts of styrene and 28 - 32 parts of methyl methacrylate using a dropping funnel, stir and mix evenly. During the reaction, gradually add 32 - 34 parts of butyl acrylate and 15 - 17 parts of 2-hydroxyethyl acrylate, and stir and mix evenly.

[0027] Further, in S4, under the protection of an inert gas, raise the temperature of the reaction kettle to 120 - 140 °C to initiate the polymerization reaction, maintain stirring to ensure uniform mixing of the reactants, and the reaction time is 4 - 6 hours.

[0028] Further, in S5, when the reaction is nearly completed, add 22 - 24 parts of catalyst, continue stirring for 28 - 32 minutes, gradually lower the temperature of the reaction kettle to room temperature, and stop stirring.

[0029] Further, in S6, filter the reaction mixture through a filter to remove the existing solid impurities, and evaporate and remove the residual solvent and unreacted monomers under vacuum.

[0030] Advantages of the present invention:

[0031] 1. In the present invention, by introducing a polyester intermediate, especially the use of cottonseed oleic acid and pentaerythritol, a long-chain aliphatic structure and more cross-linking points are provided for the polymer chain, thereby enhancing the network structure of the coating and improving the hardness of the coating. In addition, the addition of styrene not only increases the hardness of the coating but also provides a rigid benzene ring structure, further enhancing the mechanical strength of the coating and improving the hardness of the coating.

[0032] 2. By using polyester intermediates and acrylate monomers (methyl methacrylate), the coating can form a coating with good thickness and texture after curing, which helps to improve the fullness of the coating and make its appearance more beautiful.

[0033] 3. In the present invention, adding butyl acrylate can provide flexibility and good film-forming property for the coating, which helps to prevent the coating from cracking due to temperature changes or physical impacts during use.

[0034] 4. In the present invention, the long-chain aliphatic structure of cottonseed oleic acid not only increases the flexibility of the coating, but also improves the permeability of the coating, enabling the coating to better penetrate into the micropores of the substrate and achieving an improvement in the adhesion between the coating and the substrate.

[0035] 5. In the present invention, by adding hydroxyethyl acrylate, reactive hydroxyl groups are provided, which can increase the adhesion of the coating to the substrate while participating in the polymerization reaction, improving the crosslinking density of the coating, and further enhancing the water resistance of the coating.

[0036] 6. In the present invention, by using a catalyst and high-temperature polymerization reaction, it helps to accelerate the speed of the polymerization reaction. Benzoic acid can improve the rheology and drying speed of the coating by adjusting the molecular weight of the polyester intermediate and providing end groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a process flow chart of the preparation method of the acrylic resin for bio-based oil-modified anti-corrosion coating in the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0038] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings of the specification.

[0039] Example:

[0040] The present invention provides a formulation of acrylic resin for bio-based oil-modified anti-corrosion coating, which is composed of the following raw materials in parts by weight: 890 - 910 parts of polyester intermediate, 115 - 125 parts of xylene, 430 - 450 parts of styrene, 28 - 32 parts of methyl methacrylate, 32 - 34 parts of butyl acrylate, 15 - 17 parts of hydroxyethyl acrylate, and 22 - 24 parts of catalyst.

[0041] The formulation of the polyester intermediate is composed of the following raw materials in parts by weight: 520 - 540 parts of cottonseed oleic acid, 190 - 210 parts of glycerol, 230 - 250 parts of phthalic anhydride, 35 - 45 parts of pentaerythritol, 65 - 75 parts of benzoic acid, and 880 - 920 parts of xylene.

[0042] Among them: The polyester intermediate is prepared by reacting cottonseed fatty acid, glycerol, phthalic anhydride, pentaerythritol, benzoic acid and xylene. As the basic structure, the polyester intermediate provides the framework and basic physical properties of the coating, including hardness and water resistance.

[0043] Cottonseed fatty acid participates in the synthesis of the polyester intermediate, introducing a long-chain aliphatic structure into the polymer chain and increasing the flexibility and permeability of the coating.

[0044] As a polyol, glycerol serves as a crosslinking point in polyester synthesis, helping to form a network structure and improve the hardness and chemical resistance of the coating.

[0045] Phthalic anhydride participates in the esterification reaction, providing an additional aromatic ring structure and enhancing the heat resistance and mechanical strength of the coating.

[0046] As another polyol, pentaerythritol provides more crosslinking points, promoting a higher degree of crosslinked structure and thus improving the hardness and water resistance of the coating.

[0047] Benzoic acid participates in regulating the molecular weight of the polyester intermediate and providing end groups, affecting the rheology and drying speed of the coating.

[0048] As a solvent, xylene is used to adjust the viscosity of the reaction system, facilitating mixing and heat transfer, and at the same time helping to remove by-products and unreacted monomers during the preparation process.

[0049] Styrene provides a rigid benzene ring structure, increasing the hardness and gloss of the coating. At the same time, its double bond participates in the polymerization reaction, enhancing the chemical resistance and adhesion of the coating.

[0050] Methyl methacrylate provides the hardness and gloss of the coating, and its relatively high glass transition temperature helps to improve the drying speed and abrasion resistance of the coating.

[0051] Due to its long alkyl side chain, butyl acrylate provides flexibility and good film-forming properties for the coating, helping to prevent the coating from cracking.

[0052] 2-Hydroxyethyl acrylate provides reactive hydroxyl groups for increasing the adhesion of the coating to the substrate and participates in the polymerization reaction, helping to improve the crosslink density and water resistance of the coating.

[0053] The catalyst is used to accelerate the polymerization reaction, control the reaction rate and the molecular weight distribution of the polymer.

[0054] The present invention also provides a preparation method of an acrylic resin for a bio-based oil-modified anti-corrosion coating, and the method steps are as follows:

[0055] S1: Prepare the polyester intermediate;

[0056] S2: Add the prepared polyester intermediate and xylene into the reaction kettle;

[0057] S3: Add styrene, methyl methacrylate, butyl acrylate and 2-hydroxyethyl acrylate to the reactor.

[0058] S4: Conduct a polymerization reaction in the reactor.

[0059] S5: Add a catalyst to the reactor for reaction.

[0060] S6: Remove the residual solvent and unreacted monomers.

[0061] Specifically, in S1, the preparation method of the polyester intermediate is as follows:

[0062] Step 1: Clean and assemble the reactor, configure a temperature controller and a stirrer to ensure normal operation, and prepare an inert gas supply system to protect the reaction system.

[0063] Step 2: Add 520 - 540 parts of cottonseed oleic acid to the reactor, slowly add 190 - 210 parts of glycerol with a purity of 99.5% using a dropping funnel, start the stirrer and stir at a low speed, then gradually add 230 - 250 parts of phthalic anhydride, continue stirring, and then add 35 - 45 parts of 95% pentaerythritol, keep the temperature controlled at 60 - 70 °C, gradually add 65 - 75 parts of benzoic acid, maintain continuous stirring, and finally add 880 - 920 parts of xylene and stir evenly.

[0064] Step 3: Raise the temperature of the reactor to 180 - 200 °C and maintain it within the temperature range of 180 - 200 °C to start the esterification reaction of the reactants, maintain stirring to ensure uniform mixing of the reactants, the reaction time is 4 - 6 hours, and use a pH meter to monitor the pH value of the reaction mixture to ensure it is within the neutral range.

[0065] Step 4: As the reaction progresses, gradually remove the generated water and unreacted low-boiling substances using a vacuum system, and recover the evaporated solvent and substances through a condenser.

[0066] Step 5: After the reaction is completed, gradually lower the temperature of the reactor to room temperature, adjust the viscosity and composition ratio of the final product as needed to ensure that the polyester intermediate meets the predetermined formulation requirements.

[0067] Step 6: Filter the final product through a filter to remove possible solid impurities, and store the filtered polyester intermediate in a dry and cool environment for later use.

[0068] Specifically, in S2, add 890 - 910 parts of the polyester intermediate and 115 - 125 parts of xylene to the reactor, start the stirrer, and stir at a low speed to ensure uniform mixing.

[0069] Specifically, in S3, 430 - 450 parts of styrene and 28 - 32 parts of methyl methacrylate are slowly added using a dropping funnel, stirred and mixed evenly. During the reaction, 32 - 34 parts of butyl acrylate and 15 - 17 parts of 2 - hydroxyethyl acrylate are gradually added and stirred and mixed evenly.

[0070] Specifically, in S4, under the protection of an inert gas, the temperature of the reaction kettle is raised to 120 - 140 °C to initiate the polymerization reaction, stirring is maintained to ensure uniform mixing of the reactants, and the reaction time is 4 - 6 hours.

[0071] Specifically, in S5, when the reaction is nearly complete, 22 - 24 parts of the catalyst are added, stirring is continued for 28 - 32 minutes, and the temperature of the reaction kettle is gradually reduced to room temperature, then stirring is stopped.

[0072] Specifically, in S6, the reaction mixture is filtered through a filter to remove the existing solid impurities, and the residual solvent and unreacted monomers are removed by evaporation under vacuum.

[0073] Example 1:

[0074] Prepare a formulation for an acrylic resin for bio - based oil - modified anti - corrosion coatings, with the following parts by weight: 890 parts of polyester intermediate, 115 parts of xylene, 430 parts of styrene, 28 parts of methyl methacrylate, 32 parts of butyl acrylate, 15 parts of 2 - hydroxyethyl acrylate, and 22 parts of catalyst;

[0075] Prepare a formulation for the polyester intermediate, with the following parts by weight: 520 parts of cottonseed oleic acid, 190 parts of glycerol, 230 parts of phthalic anhydride, 35 parts of pentaerythritol, 65 parts of benzoic acid, and 880 parts of xylene.

[0076] A preparation method for an acrylic resin for bio - based oil - modified anti - corrosion coatings, the method steps are as follows:

[0077] S1: Preparation of polyester intermediate; Step 1: Clean and assemble the reaction kettle, configure a temperature controller and a stirrer to ensure normal operation, and prepare an inert gas supply system to protect the reaction system; Step 2: Add 520 parts of cottonseed oleic acid into the reaction kettle, slowly add 190 parts of glycerol with a purity of 99.5% using a dropping funnel, start the stirrer simultaneously for low-speed stirring, then gradually add 230 parts of phthalic anhydride, continue stirring, and then add 35 parts of 95% pentaerythritol, keep the temperature controlled at 60 °C, gradually add 65 parts of benzoic acid, and maintain continuous stirring. Finally, add 880 parts of xylene and stir evenly; Step 3: Raise the temperature of the reaction kettle to 180 °C and maintain it within the temperature range of 180 °C to start the esterification reaction of the reactants, maintain stirring to ensure uniform mixing of the reactants, the reaction time is 4 hours, and use a pH meter to monitor the pH value of the reaction mixture to ensure it is within the neutral range; Step 4: As the reaction proceeds, gradually remove the generated water and unreacted low-boiling substances using a vacuum system, and recover the evaporated solvent and substances through a condenser; Step 5: After the reaction is completed, gradually lower the temperature of the reaction kettle to room temperature, adjust the viscosity and composition ratio of the final product as needed to ensure that the polyester intermediate meets the predetermined formulation requirements; Step 6: Filter the final product through a filter to remove possible solid impurities, and store the filtered polyester intermediate in a dry and cool environment for later use.

[0078] S2: Add the prepared polyester intermediate and xylene into the reaction kettle; Add 890 parts of polyester intermediate and 115 parts of xylene into the reaction kettle, start the stirrer, and stir at low speed to ensure uniform mixing.

[0079] S3: Add styrene, methyl methacrylate, butyl acrylate, and 2-hydroxyethyl acrylate into the reaction kettle; Slowly add 430 parts of styrene and 28 parts of methyl methacrylate using a dropping funnel, stir and mix evenly. During the reaction, gradually add 32 parts of butyl acrylate and 15 parts of 2-hydroxyethyl acrylate, and stir and mix evenly.

[0080] S4: Carry out a polymerization reaction in the reaction kettle; Under the protection of inert gas, raise the temperature of the reaction kettle to 120 °C to initiate the polymerization reaction, maintain stirring to ensure uniform mixing of the reactants, and the reaction time is 4 hours.

[0081] S5: Add a catalyst into the reaction kettle for reaction; When the reaction is approaching completion, add 22 parts of the catalyst, continue stirring for 28 minutes, gradually lower the temperature of the reaction kettle to room temperature, and stop stirring.

[0082] S6: Remove the residual solvent and unreacted monomers; Filter the reaction mixture through a filter to remove the existing solid impurities, and evaporate and remove the residual solvent and unreacted monomers under vacuum.

[0083] Example 2:

[0084] Prepare the formulation of the acrylic resin for bio-based oil-modified anti-corrosion coatings, with the following weight parts: 900 parts of polyester intermediate, 120 parts of xylene, 440 parts of styrene, 30 parts of methyl methacrylate, 33 parts of butyl acrylate, 16 parts of 2-hydroxyethyl acrylate, and 23 parts of catalyst;

[0085] Prepare the formulation of the polyester intermediate, with the following weight parts: 530 parts of cottonseed fatty acid, 200 parts of glycerol, 240 parts of phthalic anhydride, 40 parts of pentaerythritol, 70 parts of benzoic acid, and 900 parts of xylene.

[0086] The preparation method of the acrylic resin for bio-based oil-modified anti-corrosion coatings is as follows:

[0087] S1: Prepare the polyester intermediate; Step 1: Clean and assemble the reaction kettle, configure the temperature controller and stirrer to ensure normal operation, and prepare the inert gas supply system to protect the reaction system; Step 2: Add 530 parts of cottonseed fatty acid into the reaction kettle, slowly add 200 parts of glycerol with a purity of 99.5% using a dropping funnel, start the stirrer and stir at a low speed simultaneously, then gradually add 240 parts of phthalic anhydride, continue stirring, and then add 40 parts of 95% pentaerythritol, keep the temperature controlled at 65 °C, gradually add 70 parts of benzoic acid, and maintain continuous stirring. Finally, add 900 parts of xylene and stir evenly; Step 3: Raise the temperature of the reaction kettle to 190 °C and maintain it within the temperature range of 190 °C to make the reactants start the esterification reaction, maintain stirring to ensure the reactants are evenly mixed, the reaction time is 5 hours, and use a pH meter to monitor the pH value of the reaction mixture to ensure it is within the neutral range; Step 4: As the reaction progresses, gradually remove the generated water and unreacted low-boiling substances using the vacuum system, and recover the evaporated solvent and substances through the condenser; Step 5: After the reaction is completed, gradually lower the temperature of the reaction kettle to room temperature, adjust the viscosity and composition ratio of the final product as needed to ensure that the polyester intermediate meets the predetermined formulation requirements; Step 6: Filter the final product through a filter to remove possible solid impurities, and store the filtered polyester intermediate in a dry and cool environment for later use.

[0088] S2: Add the prepared polyester intermediate and xylene into the reaction kettle; Add 900 parts of polyester intermediate and 120 parts of xylene into the reaction kettle, start the stirrer, and stir at a low speed to ensure uniform mixing.

[0089] S3: Add styrene, methyl methacrylate, butyl acrylate, and 2-hydroxyethyl acrylate into the reaction kettle; Slowly add 440 parts of styrene and 30 parts of methyl methacrylate using a dropping funnel, stir and mix evenly. During the reaction, gradually add 33 parts of butyl acrylate and 16 parts of 2-hydroxyethyl acrylate, and stir and mix evenly.

[0090] S4: Conduct the polymerization reaction in a reaction kettle; under the protection of an inert gas, raise the temperature of the reaction kettle to 130 °C to initiate the polymerization reaction, maintain stirring to ensure uniform mixing of the reactants, and the reaction time is 5 hours.

[0091] S5: Add a catalyst to the reaction kettle for reaction; when the reaction is nearly complete, add 23 parts of the catalyst, continue stirring for 30 minutes, gradually lower the temperature of the reaction kettle to room temperature, and stop stirring.

[0092] S6: Remove the residual solvent and unreacted monomers; filter the reaction mixture through a filter to remove the existing solid impurities, and evaporate under vacuum to remove the residual solvent and unreacted monomers.

[0093] Example 3:

[0094] Prepare the formulation of the acrylic resin for bio-based oil-modified anti-corrosion coatings, according to the following weight parts: 910 parts of polyester intermediate, 125 parts of xylene, 450 parts of styrene, 32 parts of methyl methacrylate, 34 parts of butyl acrylate, 17 parts of 2-hydroxyethyl acrylate, and 24 parts of catalyst;

[0095] Prepare the formulation of the polyester intermediate, according to the following weight parts: 540 parts of cottonseed oleic acid, 210 parts of glycerol, 250 parts of phthalic anhydride, 45 parts of pentaerythritol, 75 parts of benzoic acid, and 920 parts of xylene.

[0096] The preparation method of the acrylic resin for bio-based oil-modified anti-corrosion coatings, the method steps are as follows:

[0097] S1: Preparation of polyester intermediate; Step 1: Clean and assemble the reaction kettle, configure the temperature controller and stirrer to ensure normal operation, and prepare an inert gas supply system to protect the reaction system; Step 2: Add 540 parts of cottonseed oleic acid into the reaction kettle, slowly add 210 parts of glycerol with a purity of 99.5% using a dropping funnel, start the stirrer and stir at a low speed simultaneously, then gradually add 250 parts of phthalic anhydride, continue stirring, and then add 45 parts of 95% pentaerythritol, keep the temperature controlled at 70 °C, gradually add 75 parts of benzoic acid, and maintain continuous stirring. Finally, add 920 parts of xylene and stir evenly; Step 3: Raise the temperature of the reaction kettle to 200 °C and maintain it within the temperature range of 200 °C to make the reactants start the esterification reaction, maintain stirring to ensure the reactants are evenly mixed, the reaction time is 6 hours, and use a pH meter to monitor the pH value of the reaction mixture to ensure it is within the neutral range; Step 4: As the reaction progresses, gradually remove the generated water and unreacted low-boiling substances using a vacuum system, and recover the evaporated solvent and substances through a condenser; Step 5: After the reaction is completed, gradually lower the temperature of the reaction kettle to room temperature, adjust the viscosity and composition ratio of the final product as needed to ensure that the polyester intermediate meets the predetermined formula requirements; Step 6: Filter the final product through a filter to remove possible solid impurities, and store the filtered polyester intermediate in a dry and cool environment for later use.

[0098] S2: Add the prepared polyester intermediate and xylene into the reaction kettle; Add 910 parts of polyester intermediate and 125 parts of xylene into the reaction kettle, start the stirrer, and stir at a low speed to ensure uniform mixing.

[0099] S3: Add styrene, methyl methacrylate, butyl acrylate, and 2-hydroxyethyl acrylate into the reaction kettle; Slowly add 450 parts of styrene and 32 parts of methyl methacrylate using a dropping funnel, stir and mix evenly. During the reaction, gradually add 34 parts of butyl acrylate and 17 parts of 2-hydroxyethyl acrylate, and stir and mix evenly.

[0100] S4: Conduct polymerization reaction in the reaction kettle; Under the protection of inert gas, raise the temperature of the reaction kettle to 140 °C to initiate the polymerization reaction, maintain stirring to ensure the reactants are evenly mixed, and the reaction time is 6 hours.

[0101] S5: Add a catalyst into the reaction kettle for reaction; When the reaction is nearly completed, add 24 parts of the catalyst, continue stirring for 32 minutes, gradually lower the temperature of the reaction kettle to room temperature, and stop stirring.

[0102] S6: Remove the residual solvent and unreacted monomers; Filter the reaction mixture through a filter to remove the existing solid impurities, and evaporate and remove the residual solvent and unreacted monomers under vacuum.

[0103] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. The acrylic resin formula for bio-based grease-modified anti-corrosion coating is characterized by: The composition is composed of the following raw materials in parts by weight: 890-910 parts of polyester intermediate, 115-125 parts of xylene, 430-450 parts of styrene, 28-32 parts of methyl methacrylate, 32-34 parts of butyl acrylate, 15-17 parts of hydroxyethyl acrylate and 22-24 parts of catalyst; The polyester intermediate is formulated from the following raw materials in parts by weight: 520-540 parts of cottonseed oil acid, 190-210 parts of glycerol, 230-250 parts of phthalic anhydride, 35-45 parts of pentaerythritol, 65-75 parts of benzoic acid and 880-920 parts of xylene.

2. The acrylic resin formulation for bio-based grease-modified anticorrosive coating according to claim 1, characterized in that: The glycerol used is 99.5% pure glycerol.

3. The acrylic resin formulation for bio-based grease-modified anticorrosive coating according to claim 1, characterized in that: The pentaerythritol used is pentaerythritol with a purity of 95%.

4. A method for preparing an acrylic resin for bio-based grease-modified anti-corrosion coating, using the acrylic resin formula for bio-based grease-modified anti-corrosion coating as described in claims 1-3, characterized in that: The method steps are as follows: S1: Preparation of polyester intermediates; S2: adding the prepared polyester intermediate and xylene into a reactor; S3: adding styrene, methyl methacrylate, butyl acrylate and hydroxyethyl acrylate to the reactor; S4: performing polymerization reaction in a reactor; S5: adding a catalyst into the reactor to carry out a reaction; S6: removing the residual solvent and unreacted monomers.

5. The method for preparing the acrylic resin for bio-based oil-modified anticorrosive coating according to claim 4, characterized in that: In S1, the steps of preparing the polyester intermediate are as follows: Step 1: Clean and assemble the reactor, configure the temperature controller and agitator, ensure normal operation, and prepare the inert gas supply system to protect the reaction system; Step 2: Add 520-540 parts of cottonseed oil acid into a reaction kettle, slowly add 190-210 parts of glycerol with a purity of 99.5% using a dropping funnel, start the agitator for low-speed stirring, gradually add 230-250 parts of phthalic anhydride, continue stirring, then add 35-45 parts of 95% pentaerythritol, keep the temperature at 60-70°C, gradually add 65-75 parts of benzoic acid, continue stirring, and finally, add 880-920 parts of xylene and stir evenly; Step 3: Raise the temperature of the reactor to 180-200°C and maintain it within the temperature range of 180-200°C to start the esterification reaction of the reactants. Maintain stirring to ensure that the reactants are evenly mixed. The reaction time is 4-6 hours. Use a pH meter to monitor the pH of the reaction mixture to ensure that it is within the neutral range. Step 4: As the reaction proceeds, the generated water and unreacted low-boiling substances are gradually removed using a vacuum system, and the evaporated solvent and substances are recovered through a condenser; Step 5: After the reaction is completed, gradually lower the temperature of the reactor to room temperature, and adjust the viscosity and component ratio of the final product as needed to ensure that the polyester intermediate meets the predetermined formula requirements; Step 6: Filter the final product through a filter to remove possible solid impurities, and store the filtered polyester intermediate in a dry and cool environment for later use.

6. The method for preparing the acrylic resin for bio-based oil-modified anticorrosive coating according to claim 4, characterized in that: In S2, 890-910 parts of polyester intermediate and 115-125 parts of xylene are added into a reaction kettle, and the stirrer is started and stirred at a low speed to ensure uniform mixing.

7. The method for preparing the acrylic resin for bio-based oil-modified anticorrosive coating according to claim 4, characterized in that: In S3, 430-450 parts of styrene and 28-32 parts of methyl methacrylate are slowly added using a dropping funnel, and stirred and mixed. During the reaction, 32-34 parts of butyl acrylate and 15-17 parts of hydroxyethyl acrylate are gradually added, and stirred and mixed.

8. The method for preparing the acrylic resin for bio-based oil-modified anticorrosive coating according to claim 4, characterized in that: In S4, under the protection of inert gas, the temperature of the reactor is raised to 120-140° C. to initiate the polymerization reaction, and stirring is maintained to ensure that the reactants are mixed evenly. The reaction time is 4-6 hours.

9. The method for preparing the acrylic resin for bio-based oil-modified anticorrosive coating according to claim 4, characterized in that: In S5, when the reaction is nearly completed, 22-24 parts of catalyst are added, stirring is continued for 28-32 minutes, the temperature of the reactor is gradually reduced to room temperature, and stirring is stopped.

10. The method for preparing the acrylic resin for bio-based oil-modified anticorrosive coating according to claim 4, characterized in that: In S6, the reaction mixture is filtered through a filter to remove the solid impurities present, and the residual solvent and unreacted monomers are evaporated under vacuum to remove them.

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