Bio-based waterborne and solvent-free universal preservative colorant and method of making same

Abstract

The application discloses a kind of bio-based water-based and solvent-free general anticorrosive color paste and preparation method thereof, the color paste includes the following components: pigment carrier resin, emulsifier, dispersion modifier, pigment, first filler, second filler, wetting agent, defoaming agent.The pigment carrier resin is bifunctional modified epoxy resin;The emulsifier is nonionic reactive epoxy resin emulsifier with epoxy group;The dispersion modifier is plant polyphenol polyether type glycidyl ether.The application uses bifunctional modified epoxy resin as pigment carrier resin, and uses plant polyphenol polyether type glycidyl ether and nonionic reactive epoxy resin emulsifier with epoxy group to improve the hydrophilicity of system, to give the color paste excellent dispersion stability, corrosion resistance and physical and mechanical properties, can be dissolved in water-based, solvent-free and solvent type epoxy anticorrosive coating under the condition of solvent-free, does not contain any solvent, with zero VOC, health environmental protection characteristics.

Description

Technical Field

[0001] This invention relates to the field of coatings, and in particular to a bio-based water-based and solvent-free universal anti-corrosion color paste and its preparation method, which is widely used in the production of metal anti-corrosion coatings in fields such as engineering machinery, steel structure engineering, bridges and mechanical equipment. Background Technology

[0002] With the implementation of national environmental protection policies and the enhancement of social environmental awareness, coating companies have begun to transform from the past single solvent-based coatings to environmentally friendly coatings such as water-based, solvent-free, and high-solids coatings. The anti-corrosion performance of coatings has also gradually expanded from wood coatings with low anti-corrosion requirements to industrial anti-corrosion fields with high anti-corrosion requirements. This has led to a surge in the variety of coatings produced by companies, an increase in inventory, and a coexistence of water-based, solvent-free, high-solids, and traditional solvent-based coatings.

[0003] Color pastes are semi-finished products made by dispersing pigments or pigments and fillers within paints, and are an important component of coatings. With the transformation and development of the coatings industry, the production of color pastes has inevitably increased dramatically, which has inadvertently increased safety hazards and costs for enterprises. Therefore, developing a universal color paste is of great significance to coatings companies.

[0004] Currently, most general-purpose color pastes developed in the industry use hydrophilic solvents. For example, Chinese patent CN101760083B discloses a water-oil general-purpose iron oxide color paste, which is composed of iron oxide pigment, wetting and dispersing agent, multiplicative agent, defoamer, and co-solvent. The co-solvent uses organic solvents such as N-methylpyrrolidone, N-octylpyrrolidone, dipropylene glycol methyl ether, tetraethylene glycol dimethyl ether, polypropylene glycol, or polyethylene glycol. Chinese patent CN111019442B discloses a highly concentrated general-purpose color paste, which includes polyester-modified acrylic resin, dispersant, dispersing aid, pigment, and organic solvent, wherein the organic solvent is propylene glycol methyl ether acetate and S-100 solvent oil. Chinese patent CN111925692B discloses a general-purpose color paste and its preparation method. The general-purpose color paste includes a ketone-aldehyde resin solution, polyether polyol, pigment, filler, dispersant, and solvent, wherein the solvent is propylene glycol methyl ether acetate.

[0005] Hydrophilic solvents are generally either low-boiling-point or high-boiling-point hydrophilic solvents. Color pastes prepared using low-boiling-point hydrophilic solvents have high VOC content and are flammable, making them unsafe and inconsistent with the concept of green and environmentally friendly coatings. Color pastes prepared using high-boiling-point hydrophilic solvents have slow solvent evaporation, and the hydrophilicity affects their anti-corrosion performance, limiting their application to coatings with low anti-corrosion requirements, such as interior and exterior wall coatings. Summary of the Invention

[0006] This invention provides a bio-based, water-based, and solvent-free universal preservative color paste and its preparation method, which can solve the above-mentioned problems existing in the universal color paste prepared by using hydrophilic solvents in the prior art.

[0007] To address the aforementioned technical problems, this invention provides a bio-based, water-based, and solvent-free universal preservative colorant, comprising the following components by weight:

[0008] The composition includes 20-40 parts pigment carrier resin, 1-10 parts emulsifier, 1-10 parts dispersant modifier, 20-70 parts pigment, 5-20 parts first filler, 5-20 parts second filler, 0.1-1.0 parts wetting agent, and 0.1-0.6 parts defoamer.

[0009] The pigment carrier resin is a bifunctional modified epoxy resin with an epoxy equivalent of 260 to 290.

[0010] The emulsifier is a nonionic reactive epoxy resin emulsifier with epoxy groups;

[0011] The dispersing modifier is a plant polyene phenol polyether type glycidyl ether, and its structural formula is:

[0012]

[0013] In the formula, R1 is -C 15 H 27 -C 15 H 29 Or C 15 H 31 A straight-chain hydrocarbon group structure;

[0014] -CH(R2)- is attached to the ortho or para carbon of the benzene ring with a phenolic hydroxyl group on the benzene ring, and R2 is at least one of -H, -CH3, -CH2CH3 or -CH2CH2CH3;

[0015] R3 is a mixture of -H and -CH3 and / or -CH2CH3, and the molar percentage of the ethoxy group of -H in R3 is more than 50%.

[0016] R4 is

[0017] x is an integer, and 0 ≤ x ≤ 10;

[0018] m is an integer, and 5 ≤ m ≤ 200;

[0019] n is an integer, and 1 ≤ n ≤ 3.

[0020] In a preferred embodiment of the present invention, the pigment carrier resin is a plant polyene phenol diglycidyl ether resin, and its structural formula is as follows: Where n is 0, 2, 4 or 6.

[0021] In a preferred embodiment of the present invention, the emulsifier is a nonionic reactive epoxy resin emulsifier with epoxy groups synthesized based on cashew phenol polyoxyethylene ether, with an epoxy equivalent of 10,000 to 40,000, and its structural formula is as follows: Where R is C 15 H 27 C 15 H 29 Or C 15 H 31 A straight-chain hydrocarbon structure; P and Q are ethylene oxide or propylene oxide independently; A is...

[0022] In a preferred embodiment of the present invention, the wetting agent is a hyperbranched polyether.

[0023] In a preferred embodiment of the present invention, the wetting agent is isomeric decaol hyperbranched polyether.

[0024] In a preferred embodiment of the present invention, the first filler is finely precipitated barium sulfate with a particle size of 800-1000 mesh.

[0025] In a preferred embodiment of the present invention, the second filler is sericite powder with a particle size of 1000-1250 mesh.

[0026] In a preferred embodiment of the present invention, the defoamer is a block polyether polymer.

[0027] In a preferred embodiment of the present invention, the defoamer is a block polyether modified siloxane.

[0028] To address the aforementioned technical problems, this invention also provides a method for preparing a bio-based water-based and solvent-free universal anti-corrosion color paste. First, the pigment carrier resin, dispersant modifier, and emulsifier of the specified amounts are heated to 60–80°C and stirred until uniformly mixed. Then, the mixture is cooled to 10–30°C, and the wetting agent, defoamer, pigment, and first filler are added. After stirring and mixing, the mixture is ground to a fineness ≤25μm. Then, a second filler is added, and the mixture is stirred until a fineness ≤30μm is obtained, thus obtaining the bio-based water-based and solvent-free universal anti-corrosion color paste.

[0029] The beneficial effects of this invention are as follows: This invention provides a method for preparing a bio-based water-based and solvent-free universal anti-corrosion color paste. It uses a bifunctional modified epoxy resin as the pigment carrier resin, and simultaneously employs plant polyene phenol polyether-type glycidyl ether and an epoxy-containing nonionic reactive epoxy resin emulsifier to improve the hydrophilicity of the system. This results in a color paste containing hydrophilic groups, exhibiting good wetting and dispersibility, and good compatibility. It is soluble in water-based, solvent-free, and solvent-based epoxy anti-corrosion coatings even under solvent-free conditions, thus avoiding the addition of solvents. It features zero VOCs and is healthy and environmentally friendly. The double bonds, epoxy groups, and benzene ring structures present in the raw materials endow the color paste with excellent corrosion resistance and physical and mechanical properties. Attached Figure Description

[0030] Figure 1 This is the FT-IR spectrum of plant polyene phenol polyether glycidyl ether, the raw material used in the anti-corrosion pigment of this invention. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0032] This invention develops a color paste that does not use any solvent. It uses a bifunctional modified epoxy resin as the pigment carrier resin, and simultaneously uses plant polyene phenol polyether glycidyl ether and epoxy-containing nonionic reactive epoxy resin emulsifier to improve the hydrophilicity of the system. This allows the prepared pigment paste to be uniformly and fully dispersed in the water-oil system, and has the characteristics of zero VOC, low viscosity, strong workability, and strong corrosion resistance.

[0033] The bio-based, water-based, and solvent-free universal preservative colorant developed in this invention specifically comprises the following components in parts by weight:

[0034] 20-40 parts of pigment carrier resin, wherein the pigment carrier resin is a bifunctional modified epoxy resin, preferably a plant polyene phenol diglycidyl ether resin, having an epoxy equivalent of 260-290 and a solid content of 100%, and a specific structural formula as follows: Where n is 0, 2, 4, or 6. This resin has a low molecular weight, low viscosity, strong pigment penetration, is easy to grind, contains biepoxy groups, has high crosslinking density, and strong corrosion resistance.

[0035] 1-10 parts of a dispersing modifier, wherein the dispersing modifier is a plant polyene phenol polyether type glycidyl ether, and contains at least the following structural formula:

[0036]

[0037] In the formula, R1 is -C 15 H 27 -C15 H 29 Or C 15 H 31 A straight-chain hydrocarbon group structure;

[0038] -CH(R2)- is attached to the ortho or para carbon of the benzene ring with a phenolic hydroxyl group on the benzene ring, and R2 is at least one of -H, -CH3, -CH2CH3 or -CH2CH2CH3;

[0039] R3 is a mixture of -H and -CH3 and / or -CH2CH3, and the molar percentage of the ethoxy group of -H in R3 is more than 50%.

[0040] R4 is

[0041] x is an integer, and 0 ≤ x ≤ 10;

[0042] m is an integer, and 5 ≤ m ≤ 200;

[0043] n is an integer, and 1 ≤ n ≤ 3.

[0044] The dispersant modifier contains block polyether long-chain segments with high affinity for pigments in its molecular structure, increasing its adsorption force on pigments. Simultaneously, these long-chain segments are extended in the system, and their relatively large spatial dimensions provide steric hindrance, forming a molecular chain segment isolation layer of a certain thickness on the pigment particle surface. This effectively prevents pigment particle aggregation, thereby enhancing the stability of the dispersion system. The hydrophilicity of the ether bonds also improves the compatibility with aqueous systems. Furthermore, the epoxy groups at the end groups participate in the curing reaction, thus giving the coating stronger hydrophobic and anti-corrosion properties.

[0045] 1-10 parts of emulsifier, wherein the emulsifier is a nonionic reactive epoxy resin emulsifier with epoxy groups, preferably a nonionic reactive epoxy resin emulsifier with epoxy groups synthesized based on cashew phenol polyoxyethylene ether, with an epoxy equivalent of 10,000-40,000 and a solid content of 99.8-100%, and its structural formula is as follows. Where R is C 15 H 27 C 15 H 29 Or C 15 H 31 A straight-chain hydrocarbon structure; P and Q are ethylene oxide or propylene oxide independently; A is... This emulsifier has a large molecular weight, exhibiting strong emulsification and encapsulation properties for small-molecule resins. It also acts as an anti-flocculation agent for pigments. Its long carbon chain groups, derived from cashew nuts, are highly compatible with the aforementioned bifunctional modified epoxy resins and plant polyene phenolic polyether-type glycidyl ethers. Furthermore, the ether bonds in its molecule can bind with water, exhibiting hydrophilicity and easy uniform dispersion in aqueous solutions. The epoxy groups in its molecule, after curing with the curing agent to form a film, further enhance its hydrophobic and corrosion-resistant properties.

[0046] All three components contain reactive functional groups, epoxy groups. After curing with epoxy curing agents to form a film, they can work together with the unsaturated double bonds in the molecule to form double hydrophobicity, thus possessing the anti-corrosion advantages of salt water resistance and salt spray resistance.

[0047] Pigment 20-70 parts.

[0048] The first filler is 5 to 20 parts, which is fine precipitated barium sulfate with a particle size of 800 to 1000 mesh. It greatly improves the dispersibility and can also play a role in uniformly filling the coating, which is beneficial to improving the surface smoothness of the coating film.

[0049] The second filler is 5 to 20 parts. The second filler is sericite powder, 1000 to 1250 mesh, a silicate mineral with a scaly layered structure. It forms a basically parallel orientation arrangement in the paint film, which can prolong the penetration time of the corrosive medium into the paint film.

[0050] The wetting agent comprises 0.1 to 1.0 parts, wherein the wetting agent is a hyperbranched polyether, preferably an isomeric decaol hyperbranched polyether, containing pigment-affinity groups. This component has low surface tension and strong wettability, and the long carbon chains in the molecule provide steric hindrance protection for the pigment particles, thereby stabilizing and deflocculating the pigment particles.

[0051] The defoamer is 0.1 to 0.6 parts, wherein the defoamer is a block polyether polymer with hydrophobic chains at both ends and a hydrophilic chain embedded in the middle, preferably a block polyether modified siloxane with a solid content of 100%. This structure easily balances the gas-liquid interface and has a good defoaming effect.

[0052] Preparation method: Mix the pigment carrier resin, dispersant modifier and emulsifier according to the formula, heat to 60-80℃, disperse at high speed of 800-1000 r / min for 1-2 h, then cool to 10-30℃, add the wetting agent, defoamer, pigment and first filler according to the formula in sequence, stir at 800-1000 r / min for 30 min, grind with a sand mill to fineness ≤25μm, then add the second filler, stir for 1 h at 1000-1200 min to fineness ≤30μm.

[0053] Example 1

[0054] A bio-based, water-based, and solvent-free general-purpose anticorrosive pigment, by weight, comprises: 20 parts of plant polyene phenol diglycidyl ether, 2 parts of plant polyene phenol polyether-type glycidyl ether, 1 part of cashew nut phenol reactive epoxy resin emulsifier, 0.8 parts of wetting agent hyperbranched polyether, 0.2 parts of defoamer block polyether modified siloxane, 56 parts of iron oxide red powder, 10 parts of finely precipitated barium sulfate, and 10 parts of sericite powder. The plant polyene phenol diglycidyl ether, cashew nut phenol reactive epoxy resin emulsifier, hyperbranched polyether, and block polyether modified siloxane are all from Changshu Naisu Biomaterials Technology Co., Ltd., with models PLR602A, PLR1801C, PLR1733, and PLR1735 respectively; the iron oxide red powder is from Shanghai Yipin Pigment Co., Ltd.; and the sericite powder is from Chuzhou Gree Mining.

[0055] The preparation method of the plant polyene phenol polyether type glycidyl ether is as follows:

[0056] 906g (approximately 3.0mol) of plant polyenes (containing only 3-(8-pentadecanenyl)-phenol, 5-(8,11-pentadecanadienyl)-1,3-benzenediol, and m-pentadecanylphenol) were added to a reactor, along with 9g of oxalic acid dihydrate crystals. The temperature was raised to 50-60℃, and 65.0g (approximately 2.0mol) of paraformaldehyde (Shandong Aldehyde Chemical Co., Ltd., 92.5% purity, average degree of polymerization 12) was added in four portions. The mixture was then refluxed at 80℃-85℃ for 4 hours under a nitrogen atmosphere, followed by dehydration at 100℃ under normal pressure for 2 hours, and then dehydration under vacuum for 2 hours. Finally, 5.7g of... Add 50% sodium hydroxide solution, stir for 20 minutes, vacuum (vacuum degree above -0.08MPa) for 30 minutes to dehydrate, then add 600g of methylcyclohexane, stir for 20 minutes, filter to remove salt, and then vacuum to remove methylcyclohexane to obtain plant polyene phenolic oligomer.

[0057] 930g of plant polyene phenolic oligomer (approximately 1.0 mol) was added to a high-pressure reactor, along with 5.4g of 50% potassium hydroxide solution. The temperature was raised to 110℃–115℃, and a vacuum was applied for 60 minutes. Nitrogen was then used to replace the air in the reactor several times to reduce the oxygen content to below 300 ppm. The temperature was then raised to 135℃–140℃, and 2640g (approximately 60 mol) of ethylene oxide was continuously introduced for epoxidation. The pressure was controlled below 0.5 MPa, and a heat exchanger was used to remove the heat released during the reaction. The mixture was then aged at 140–180℃ for 1 hour, with a vacuum applied to remove small volatile molecules. The temperature was lowered to 80℃, and 2.9g of acetic acid was added to neutralize the pH to 7.0 ± 1.0, yielding plant polyene phenolic oligomer polyoxyethylene ether.

[0058] 357 g (approximately 0.1 mol) of plant-derived polyene phenolic oligomer polyoxyethylene ether was added to a reactor, along with 150 g of propylene glycol dimethyl ether. The mixture was stirred for 10 minutes, and a sample was taken for testing at 50°C, yielding a viscosity of 25 CPS. 1.3 g of boron trifluoride diethyl ether complex was added, and the temperature was raised to 60°C. 30.5 g (approximately 0.33 mol) of epichlorohydrin was added dropwise, with the addition time controlled at 90 ± 10 minutes and the reaction temperature maintained at 60-65°C for 2 hours. The temperature was then lowered to 40°C, and 80.7 g (approximately 0.35 mol) of 30% potassium methoxide methanol solution was added dropwise, with the addition time controlled at 90 ± 10 minutes and the reaction temperature maintained at 55-60°C. After the addition was complete, the mixture was kept at this temperature for 3 hours. The mixture was filtered while hot to remove salts, and the filtrate was vacuum-sealed to remove propylene glycol dimethyl ether, yielding plant-derived polyene powder polyether-type glycidyl ether. Its FT-IR spectrum is shown in the attached image. Figure 1 .

[0059] Preparation of the above-mentioned bio-based water-based and solvent-free general-purpose anticorrosive color paste: 20 parts (by weight, the same below) of plant polyene phenol diglycidyl ether, 2 parts of plant polyene phenol polyether type glycidyl ether and 1 part of cashew phenol reactive epoxy resin emulsifier were mixed, heated to 70℃, and dispersed at high speed of 1000 r / min for 1 h. Then the temperature was lowered to 20℃, and 0.8 parts of hyperbranched polyether, 0.2 parts of block polyether modified siloxane, 56 parts of iron oxide red powder and 10 parts of finely precipitated barium sulfate were added in sequence. After stirring at 1000 r / min for 30 min, the mixture was ground to a fineness of ≤25 μm using a sand mill. Then 10 parts of sericite powder were added and stirred for 1200 min for 1 h to a fineness of ≤30 μm.

[0060] Example 2

[0061] The difference from Example 1 lies in the different formulation components of the bio-based water-based and solvent-free universal preservative colorant. Specifically, by weight, it includes: 30 parts of plant polyene phenol diglycidyl ether, 3 parts of plant polyene phenol polyether type glycidyl ether, 3 parts of cashew phenol reactive epoxy resin emulsifier, 0.8 parts of wetting agent hyperbranched polyether, 0.2 parts of defoamer block polyether modified siloxane, 43 parts of iron oxide red powder, 10 parts of finely precipitated barium sulfate, and 10 parts of sericite powder.

[0062] The preparation method is the same as in Example 1.

[0063] Example 3

[0064] The difference from Example 1 lies in the different formulation components of the bio-based water-based and solvent-free universal preservative colorant. Specifically, by weight, it includes: 40 parts of plant polyene phenol diglycidyl ether, 6 parts of plant polyene phenol polyether type glycidyl ether, 2 parts of cashew phenol reactive epoxy resin emulsifier, 0.8 parts of wetting agent hyperbranched polyether, 0.2 parts of defoamer block polyether modified siloxane, 31 parts of iron oxide red powder, 10 parts of finely precipitated barium sulfate, and 10 parts of sericite powder.

[0065] The preparation method is the same as in Example 1.

[0066] Performance testing

[0067] The performance of the color pastes prepared in Examples 1-3 was tested, and the test results are shown in Table 1 below.

[0068] The water dilution stability test method involves mixing the color paste and water at a mass ratio of 1:100 and observing the stability of the solution.

[0069] The solvent dilution stability test method is to mix the color paste and xylene at a mass ratio of 1:100 and observe the stability of the solution.

[0070] Table 1. Properties of Pigments

[0071]

[0072]

[0073] Application examples

[0074] The color pastes prepared in Examples 1-3 and the commercially available water-oil universal iron oxide red paste were used to prepare water-based iron oxide red epoxy anti-corrosion coatings according to the formulas in Table 2, and were denoted as Application Examples 1-3 and Comparative Example 1.

[0075] Table 2

[0076]

[0077] In Table 2 above, the aqueous epoxy emulsion is an epoxy resin dispersion emulsified with a cross-linking emulsifier based on E20 epoxy resin. It has a solids content of 55% and an epoxy equivalent of 450–550 (solids), and is sourced from Changshu Naisu Biomaterials Technology Co., Ltd.

[0078] Water-based epoxy curing agent: from Changshu Naisu Biomaterials Technology Co., Ltd., model PLR735, active hydrogen equivalent 145.

[0079] Wetting and leveling agent: from Shanghai Yike Chemical Technology Co., Ltd., model YCK1110.

[0080] Defoamer: from Shanghai Yike Chemical Technology Co., Ltd., model YCK810.

[0081] Preparation of water-based iron oxide red epoxy anti-corrosion coating: The water-based epoxy emulsion is stirred at 800–1000 rpm. The color paste is added to the stirred water-based epoxy emulsion, followed by the addition of a wetting and leveling agent and a defoamer. The mixture is then stirred at 800–1000 rpm for 10 minutes to obtain component A. Component A and component B are mixed evenly at an equivalent ratio of 1:1 to obtain the water-based iron oxide red epoxy anti-corrosion coating.

[0082] The performance of the coatings used in Examples 1-3 and Comparative Example 1 was tested, and the results are shown in Table 3 below.

[0083] Table 3

[0084]

[0085] As can be seen from the test results in Table 3, the waterborne iron oxide epoxy anticorrosive coating prepared using the bio-based waterborne and solvent-free universal color paste of the present invention has a faster drying time and hardness, and stronger resistance to salt water and corrosion.

[0086] Examples 1-3 and commercially available water-oil universal iron oxide red paste were formulated into solvent-free iron oxide red epoxy anti-corrosion coatings according to the formulas in Table 4, and are referred to as Application Examples 4-6 and Comparative Example 2.

[0087] Table 4

[0088]

[0089]

[0090] In Table 4 above, the liquid epoxy resin is: solvent-free liquid bisphenol A epoxy resin E51 with an epoxy equivalent of 190.

[0091] Cashew phenolic epoxy curing agent: from Naisu Biomaterials Technology Co., Ltd., model PLR730, active hydrogen equivalent 95.

[0092] Wetting and leveling agent: from Shanghai Yike Chemical Technology Co., Ltd., model YCK1110

[0093] Defoamer: from Shanghai Yike Chemical Technology Co., Ltd., model YCK750

[0094] Preparation method of solvent-free iron oxide red epoxy anticorrosion coating: Liquid epoxy resin is stirred at 800-1000 rpm. Color paste is added to the stirred liquid epoxy resin, followed by the addition of a wetting and leveling agent and a defoamer. The mixture is then stirred at 800-1000 rpm for 20 minutes to obtain component A. Component A and component B are mixed evenly at an equivalent ratio of 1:1 to obtain the solvent-free iron oxide red epoxy anticorrosion coating.

[0095] The performance of the coatings used in Examples 4-6 and Comparative Example 2 was tested, and the results are shown in Table 5 below.

[0096] Table 5

[0097]

[0098] As can be seen from the test results in Table 5, the solvent-free iron oxide epoxy anticorrosive coating prepared using the bio-based water-based and solvent-free universal color paste of the present invention has very good salt spray resistance and salt water resistance.

[0099] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A bio-based, water-based, and solvent-free universal preservative colorant, characterized in that, Includes the following components by weight: The composition includes 20-40 parts pigment carrier resin, 1-10 parts emulsifier, 1-10 parts dispersant modifier, 20-70 parts pigment, 5-20 parts first filler, 5-20 parts second filler, 0.1-1.0 parts wetting agent, and 0.1-0.6 parts defoamer. The pigment carrier resin is a plant polyene phenol diglycidyl ether resin with an epoxy equivalent of 260-290 and its structural formula is as follows: Where n is 0, 2, 4 or 6; The emulsifier is a nonionic reactive epoxy resin emulsifier with epoxy groups synthesized based on cashew phenol polyoxyethylene ether, with an epoxy equivalent of 10,000 to 40,000, and its structural formula is as follows: Where R is C 15 H 27 C 15 H 29 Or C 15 H 31 The straight-chain hydrocarbon structure; P and Q are independent ethylene oxides; A is... ； The dispersing modifier is a plant polyene phenol polyether type glycidyl ether, and its structural formula is: In the formula, R1 is -C 15 H 27 -C 15 H 29 Or C 15 H 31 A straight-chain hydrocarbon group structure; -CH(R2)- is attached to the ortho or para carbon of the benzene ring with a phenolic hydroxyl group on the benzene ring, and R2 is at least one of -H, -CH3, -CH2CH3 or -CH2CH2CH3; R3 is a mixture of -H and -CH3 and / or -CH2CH3, and the molar percentage of the ethoxy group of -H in R3 is more than 50%. R4 is x is an integer, and 0 ≤ x ≤ 10; m is an integer, and 5 ≤ m ≤ 200; n is an integer, and 1≤n≤3; The wetting agent is a hyperbranched polyether; The first filler is finely precipitated barium sulfate with a particle size of 800-1000 mesh; The second filler is sericite powder with a particle size of 1000-1250 mesh; The defoamer is a block polyether modified siloxane; The pigment contains no organic solvents and has zero VOCs.

2. The bio-based water-based and solvent-free universal preservative colorant according to claim 1, characterized in that, The wetting agent is isomeric decaol hyperbranched polyether.

3. A method for preparing a bio-based, water-based, and solvent-free universal preservative colorant as described in any one of claims 1-2, characterized in that, First, heat the pigment carrier resin, dispersant modifier, and emulsifier in the specified amounts to 60-80°C and stir until uniform. Then, cool the mixture to 10-30°C, add the wetting agent, defoamer, pigment, and first filler, stir, mix, and grind. Then, add the second filler and stir to obtain a bio-based water-based and solvent-free general-purpose anti-corrosion color paste with a fineness ≤30μm.

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