Quick-drying high-toughness epoxy micaceous iron oxide intermediate paint for bridge support and preparation method thereof

Abstract

The present application relates to the technical field of paint, in particular to a quick-drying high-toughness epoxy micaceous iron oxide intermediate paint for bridge support and a preparation method thereof. The quick-drying high-toughness epoxy micaceous iron oxide intermediate paint for bridge support provided by the present application takes a self-reinforced elastic epoxy resin and a modified amine mixture as main film-forming substances, modifies liquid epoxy resin by using self-made elastic nano-sulfurized rubber epoxy particles, improves the toughness (elongation at break ≥ 10%) of the resin itself, and improves the compatibility and storage stability of the curing agent by compounding the modified amine mixture.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings and its preparation method. Background Technology

[0002] The bridge bearings of railways require protective and decorative coatings during production and use. Bridge bearing materials are commonly subject to corrosion due to environmental or electrochemical factors during use. Metal corrosion of bridge bearings causes significant safety hazards and economic losses, making corrosion protection for bridge bearings a major concern. According to the standard Q / CR749.2—2020 "Protective Coatings and Paints for Railway Bridge Steel Structures and Components," the main components of anti-corrosion coatings are epoxy zinc-rich primer + epoxy intermediate coat + polyurethane or fluorocarbon topcoat. Among common corrosion protection methods, using anti-corrosion coatings offers excellent advantages such as ease of operation and outstanding anti-corrosion performance, and is widely used in bridges, bearings, and auxiliary steel structures.

[0003] When epoxy micaceous iron oxide is used as an intermediate coat in an anti-corrosion system, it is crucial that it possesses excellent recoatability and a fast drying speed. This means that excellent interlayer adhesion is required between the epoxy micaceous iron oxide coating and the acrylic polyurethane topcoat applied over it. Simultaneously, the intermediate coat increases the overall coating thickness, requiring a single-coat thickness of at least 150 micrometers (dry film thickness). The intermediate coat should not crack under high film thickness and should exhibit a certain degree of toughness in the face of mechanical impact.

[0004] There is a lot of research on epoxy micaceous iron oxide intermediate paint in China, but the drying effect varies when it is baked and dried in a heated oven (50-60 min / 80℃) on the coating production line, resulting in poor interlayer adhesion.

[0005] CN105238258A discloses a method for preparing a low-VOC solvent-free epoxy micaceous iron oxide intermediate paint. By compounding a modified resin with a liquid epoxy resin and using phenolic amine as a curing agent, the prepared micaceous iron oxide intermediate paint exhibits excellent workability, drying properties, and readily achieves a thick coating. However, in automated coating production lines, it has a short pot life and is prone to gelation.

[0006] CN111662618A discloses a light-colored, high-solids epoxy micaceous iron oxide intermediate paint and its preparation method. It uses low-viscosity linear epoxy resin and cashew phenol-modified phenolic amine curing agent as the main film-forming substances, and adds inert hydrophobic modified liquid resin. It has a low Tg and improves flexibility, but affects the drying speed. Especially under low-temperature baking conditions, it is difficult to improve the hardness after drying, which affects the sanding operation of the coating line.

[0007] CN115975472A discloses an ultra-fast drying solvent-free epoxy micaceous iron oxide coating, its preparation method, and its application. It utilizes liquid epoxy resin and a specially modified amine curing agent, along with a multifunctional epoxy reactive diluent to improve the coating's drying properties, chemical resistance, and adhesion. Components A and B are respectively supplemented with powder and additives; the solvent-free system requires high application precision. Summary of the Invention

[0008] To address the shortcomings of the prior art mentioned in the background section, this invention provides a fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings, composed of components A and B. Component A comprises the following components in parts by weight:

[0009]

[0010]

[0011] Component B comprises the following components in parts by weight:

[0012] 45.5-72.0 parts of modified amine mixture

[0013] Solvent 10.0-25.0 parts

[0014] Accelerator 0.1-0.5 parts;

[0015] Component A and Component B are used together in a mass ratio of 4 to 9:1.

[0016] The self-reinforced elastic epoxy resin is prepared by modifying liquid epoxy resin with elastic nano-vulcanized rubber epoxy particles.

[0017] The modified amine mixture is made by combining cashew phenol-modified phenolic amine with a polyamide adduct and adding fumed silica.

[0018] In some embodiments, the method for preparing the self-reinforcing elastic epoxy resin is further as follows:

[0019] Elastic nano-vulcanized rubber epoxy particles, silane coupling agent, liquid epoxy resin E44, and organic bentonite are mixed in a mass ratio of (6-14):(0.2-0.9):(30-70):(0.05-0.15), with a preferred mass ratio of 10:0.6:50:0.1.

[0020] Using a high-speed disperser, the epoxy particles are dispersed at a speed of 1000-1500 r / min for a period of time to completely disperse the elastic nano-vulcanized rubber in the liquid epoxy resin, thus obtaining a self-reinforced elastic epoxy resin.

[0021] In some embodiments, the preparation method of the elastic nano-vulcanized rubber epoxy particles is further as follows:

[0022] Elastic nano-vulcanized rubber powder and solid epoxy resin E20 are mixed evenly at a mass ratio of (0.8-1.3):2, preferably 1:2, and added to a mixture containing ethylene glycol butyl ether and xylene, wherein the mass ratio of ethylene glycol butyl ether to xylene is (0.5-1.5):1, preferably 1:1. Dispersant and silane coupling agent are added dropwise at a mass ratio of (2.5-4.5):1, preferably 3:1. The mixture is ultrasonically dispersed for a period of time, then heated under reflux for a period of time, cooled and filtered. The filter material is placed in an oven and baked. After drying, the product is ground to 325-500 mesh particles, which is the obtained elastic nano-vulcanized rubber epoxy particles.

[0023] In some embodiments, the elastic nano-vulcanized rubber powder is further composed of one or more of nitrile rubber (NBR), acrylate rubber (ACM), halogenated butyl rubber, chloroprene rubber, and EPDM rubber in any proportion.

[0024] In some embodiments, the method for preparing the modified amine mixture is further as follows:

[0025] Place fumed silica in an oven and bake for a period of time. Then, take it out, put it in an aluminum foil bag, seal it, and test the moisture content to ensure that the moisture content is ≤1%. This will give you dried fumed silica.

[0026] Cashew phenol-modified phenolic amine and polyamide adduct are weighed and mixed in a dispersion tank at a mass ratio of (5-9):1, preferably 7:1. The mixture is dispersed and stirred, and n-butanol is added, wherein the mass ratio of n-butanol to polyamide adduct is (0.6-1.3):1, preferably 1:1. The dried fumed silica is then added while stirring. After the addition is complete, the mixture is dispersed for a period of time. The dispersed sample is then placed in a water bath at (70-90)℃, preferably 75℃, for a period of time to obtain the modified amine mixture.

[0027] In some embodiments, the cashew phenol-modified phenolic amine is composed of one or more of JT-6025, HARD2500, CR205 and SM2016 in any proportion.

[0028] In some embodiments, the polyamide adduct is further composed of one or more of BS853N, CR-6118-70 and Sunmi de353N in any proportion.

[0029] In some embodiments, the defoamer is further composed of one or more of Defom6800, BYK-A530, UN IQFOAM 272S and tego Foamex N in any proportion;

[0030] The dispersant is one or more of BYK-AT203, BYK-220S, UN IQSPERSE 745S and UN IQSPERSE 710S in any proportion;

[0031] The filler material is composed of one or more of the following: talc powder (325 mesh), barite powder (325 mesh), feldspar powder (800 mesh), and wollastonite powder (800 mesh), combined in any proportion.

[0032] The anti-rust pigment is composed of one or more of the following in any proportion: white iron-titanium powder (800 mesh), gray iron-titanium powder (500 mesh), mica iron oxide gray, and titanium dioxide.

[0033] The low-viscosity reactive diluent is composed of one or more of alkyl glycidyl ether, butyl glycidyl ether, glycerol glycidyl ether and glycidyl tert-carbonate in any proportion.

[0034] The solvent is one or more of xylene, n-butanol, butyl acetate, benzyl alcohol, 100# solvent oil and 200# solvent oil in any proportion;

[0035] The accelerator is composed of one or more of 2,4,6-tris(dimethylaminomethyl)phenol, triethanolamine, and N-p-chlorophenyl-N,N'-dimethylurea in any proportion;

[0036] The thixotropic agent is composed of one or more of polyamide wax, polyolefin wax, organobentonite, modified hydrogenated castor oil, and BYK-410 in any proportion.

[0037] In some embodiments, the silane coupling agent is one or more of γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, KH-560, and KH-550 combined in any proportion.

[0038] This invention also provides a method for preparing the fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings as described above, comprising the following steps:

[0039] The preparation method of component A is as follows: weigh the raw materials according to the proportion, take the reinforced elastic epoxy resin and add it to the dispersion tank, add the defoamer, dispersant, silane coupling agent, low viscosity reactive diluent and part of the solvent, disperse at a speed of 600-900 r / min to obtain mixture I;

[0040] Under stirring at 200-400 r / min, gradually add the rust-preventive pigments, extender fillers, and thixotropic agents to mixture I, disperse at 1200-1500 r / min, and keep the system temperature at 55-60℃ for a period of time until the fineness is ≤90μm. Adjust the viscosity with the remaining solvent, filter through an 80-mesh sieve, and package by weight.

[0041] The preparation method for component B is as follows:

[0042] Add the required amount of the modified amine mixture to a dispersion tank, add the solvent and accelerator, disperse at high speed until uniform dispersion, filter through an 80-mesh sieve, and package to obtain component B;

[0043] The paint is prepared by mixing components A and B in a mass ratio of 4 to 9:1 and then stirring until homogeneous to obtain the fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings.

[0044] The beneficial effects of this invention are as follows:

[0045] 1. The intermediate paint provided by the present invention uses a mixture of self-reinforced elastic epoxy resin and modified amine as the main film-forming material. The liquid epoxy resin is modified by self-made elastic nano-vulcanized rubber epoxy particles to improve the toughness of the resin itself (elongation at break ≥10%). The compatibility and storage stability between curing agents are improved by compounding the modified amine mixture.

[0046] 2. The intermediate paint provided by this invention has excellent application and anti-corrosion performance, extremely fast drying speed (50℃, surface dry ≤30min, hard dry (no fingerprints when pressed) ≤60min), and is easy to sand; high film thickness (sagging ≥475μm) per coat, reducing the number of coats; good interlayer bonding (adhesion ≥10MPa), and excellent recoatability; the cured paint film has high strength (hardness ≥3H), good flexibility (bending ≤1mm), and excellent chemical resistance.

[0047] 3. The intermediate paint provided by this invention has high solid content (≥80% by weight), low VOC content, good environmental performance, and relatively simple construction process. It can be applied manually, or by roller coating, spraying, etc. The production process is relatively simple, with low energy consumption and low emissions. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be noted that all terms used in this invention (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and should not be construed as limiting the invention; it should be further understood that the terms used in this invention should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this invention.

[0050] The present invention provides preferred embodiments of the formulation of quick-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings.

[0051] Example 1:

[0052] A formula for a fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings is shown in Table 1:

[0053] Table 1

[0054]

[0055] The preparation method is as follows:

[0056] I. Preparation of Component A:

[0057] (1) Take the reinforced elastic epoxy resin and add it into a dispersion tank. Add defoamer, dispersant, silane coupling agent, low viscosity active diluent and part of solvent in sequence according to the formula amount. Disperse at medium speed of 600r / min for 15min to obtain mixture I.

[0058] (2) Under low speed of 200r / min stirring, gradually add the anti-rust pigment, extender and thixotropic agent in the formula to mixture I, disperse at high speed of 1500r / min for 40min, wait for the system temperature to rise to 55℃, keep warm for 30min, wait for the fineness to be ≤90μm, adjust the viscosity with the remaining solvent to meet the requirements, filter with an 80 mesh sieve, and package by weight;

[0059] II. Preparation of Component B:

[0060] Add the modified amine mixture to a dispersion tank according to the above formula, then add n-butanol and 2,4,6-tris(dimethylaminomethyl)phenol, disperse at high speed of 900 r / min for 10 min, filter through an 80 mesh sieve, and package.

[0061] III. Preparation of fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings:

[0062] Mix the paint according to the mass ratio of component A to component B of 5:1, and then stir evenly.

[0063] Example 2

[0064] A formula for a fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings is shown in Table 2:

[0065] Table 2

[0066]

[0067] The preparation method is as follows:

[0068] I. Preparation of Component A:

[0069] (1) Take the reinforced elastic epoxy resin and add it into a dispersion tank. Add defoamer, dispersant, silane coupling agent, low viscosity active diluent and part of solvent in sequence according to the formula amount. Disperse at medium speed of 900r / min for 20min to obtain mixture I.

[0070] (2) Under low speed of 400r / min stirring, gradually add the anti-rust pigment, extender and thixotropic agent in the formula to mixture I, disperse at high speed of 1300r / min for 35min, wait for the system temperature to rise to 60℃, keep warm for 30min, wait for the fineness to be ≤90μm, adjust the viscosity with the remaining solvent to meet the requirements, filter with an 80 mesh sieve, and package by weight;

[0071] II. Preparation of Component B:

[0072] Add the modified amine mixture to a dispersion tank according to the above formula, then add xylene and N-p-chlorophenyl-N,N'-dimethylurea, disperse at high speed of 1000 r / min for 8 min, filter through an 80 mesh sieve, and package.

[0073] III. Preparation of fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings:

[0074] Mix the paint according to the mass ratio of component A to component B of 8:1, and then stir evenly.

[0075] Example 3

[0076] A formula for a fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings is shown in Table 3:

[0077] Table 3

[0078]

[0079]

[0080] The preparation method is as follows:

[0081] I. Preparation of Component A:

[0082] (1) Take the reinforced elastic epoxy resin and add it into a dispersion tank. Add defoamer, dispersant, silane coupling agent, low viscosity active diluent and part of solvent in sequence according to the formula amount. Disperse at medium speed of 800r / min for 18min to obtain mixture I.

[0083] (2) Under low speed of 300r / min stirring, gradually add the anti-rust pigment, extender and thixotropic agent in the formula to mixture I, disperse at high speed of 1400r / min for 33min, wait for the system temperature to rise to 58℃, keep warm for 30min, wait for the fineness to be ≤90μm, adjust the viscosity with the remaining solvent to meet the requirements, filter with an 80 mesh sieve, and package by weight;

[0084] II. Preparation of Component B:

[0085] Add the modified amine mixture to a dispersion tank according to the above formula, add butyl acetate and triethanolamine, disperse at high speed of 1100 r / min for 5 min, filter through an 80 mesh sieve, and package.

[0086] III. Preparation of fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings:

[0087] Prepare the paint by mixing components A and B at a mass ratio of 7.5:1, and then stir thoroughly.

[0088] The preparation process of the self-reinforced elastic epoxy resin in Examples 1-3 above is as follows:

[0089] Preparation of elastic nano-vulcanized rubber epoxy particles: 100g of elastic nano-vulcanized rubber powder and solid epoxy resin E20 were mixed evenly at a mass ratio of 1:2. The mixture was added to a round-bottom flask containing 500ml of a mixture of ethylene glycol butyl ether and xylene (mass ratio 1:1). 1.5g of dispersant and 0.5g of silane coupling agent were added dropwise. The mixture was ultrasonically dispersed for 60min, then heated under reflux at 150℃ for 30min. After cooling and filtration, the filter was placed in an oven at 80℃ and baked for 5h. After drying, the product was ground to 325-500 mesh particles, which is the obtained elastic nano-vulcanized rubber epoxy particles.

[0090] Preparation of self-reinforced elastic epoxy resin: Weigh 10g of elastic nano-vulcanized rubber epoxy particles, 0.6g of silane coupling agent, 50g of liquid epoxy resin E44, and 0.1g of organobentonite. Use a high-speed disperser at 1000-1500 r / min for 40 min to ensure complete dispersion of the elastic nano-vulcanized rubber epoxy particles in the liquid epoxy resin, thus obtaining the self-reinforced elastic epoxy resin.

[0091] The preparation method of the modified amine mixture is as follows:

[0092] Place 1g of fumed silica in a white disk and bake in an oven at 110℃ for 2 hours. Then, remove the disk, seal it in an aluminum foil bag, and perform a moisture content test to ensure that the moisture content is ≤1%. Keep the sample for later use.

[0093] 70g of cashew phenol-modified phenolic amine and 30g of polyamide adduct were weighed and mixed in a 500ml dispersion vessel. After dispersing and stirring at 1000r / min for 3min, 10g of n-butanol was added, followed by the addition of fumed silica from step 1 while stirring. After the addition was complete, the stirring speed was increased to 2500r / min and the mixture was dispersed for another 10min. The dispersed sample was placed in a 75℃ water bath and kept at a constant temperature for 1h to obtain a homogeneous and well-compatible modified amine mixture.

[0094] The cashew phenol-modified phenolic amine is HARD2500X;

[0095] The polyamide adduct is BS853N.

[0096] The performance indicators of the products prepared in Examples 1-3 of this invention are shown in Table 4:

[0097] Table 4

[0098]

[0099]

[0100] The present invention also provides the following comparative examples:

[0101] Comparative Example 1:

[0102] Compared to Example 1, the self-reinforcing elastic epoxy resin was replaced with a modified epoxy resin, while all other conditions remained the same as in Example 1. The method for preparing the modified epoxy resin is as follows:

[0103] Weigh 10g of solid epoxy resin E20, 0.6g of silane coupling agent, 50g of liquid epoxy resin E44, and 0.1g of organobentonite. Use a high-speed disperser to disperse at a speed of 1000-1500r / min for 40min to obtain modified epoxy resin.

[0104] Comparative Example 2:

[0105] Compared to Example 2, the modified amine mixture was replaced with a direct mixture of a polyamide adduct and a cashew phenol-modified phenolic amine. All other conditions remained the same as in Example 1. The preparation method of the direct mixture of the polyamide adduct and cashew phenol-modified phenolic amine is as follows:

[0106] Weigh 70g of cashew phenol-modified phenolic amine and 30g of polyamide adduct and mix them in a 500ml dispersion tank. After dispersing and stirring at 1000r / min for 3min, a modified amine mixture is obtained.

[0107] The products obtained from the comparison were subjected to performance tests, and the test results are shown in Table 5.

[0108] Table 5

[0109]

[0110]

[0111] From the comparison of the above embodiments and comparative examples, it can be seen that the technical solution of the present invention achieves this through:

[0112] 1. Elastic nano-vulcanized rubber epoxy particles were added to modify liquid epoxy resin, resulting in a self-reinforced elastic epoxy resin. Compared with ordinary modified epoxy resin (Comparative Example 1), its flexural and impact properties were significantly improved. Its corrosion resistance (adhesion, resistance to damp heat) also far exceeded the technical requirements.

[0113] 2. By preparing modified amine mixtures, the performance of the coating is improved, and its storage stability is also enhanced, achieving a storage stability (sedimentation) level of 10, thus meeting construction requirements.

[0114] Finally, 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 foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings, composed of components A and B, characterized in that... Component A comprises the following components in parts by weight: 10.0-25.0 parts of self-reinforcing elastic epoxy resin 0.5-1.5 parts of defoamer Dispersant 0.2-0.9 parts 0.8-1.6 parts of silane coupling agent Rust-preventive pigment 12.0-33.0 parts 18.0-35.0 parts of filler material 0.8-2.0 parts of low-viscosity reactive diluent Thixotropic agent 0.2-3.0 parts Solvent: 4.0-9.0 parts; Component B comprises the following components in parts by weight: 45.5-72.0 parts of modified amine mixture Solvent 10.0-25.0 parts Accelerator 0.1-0.5 parts; Component A and Component B are used together in a mass ratio of 4 to 9:

1. The self-reinforced elastic epoxy resin is prepared by modifying liquid epoxy resin with elastic nano-vulcanized rubber epoxy particles. The modified amine mixture is made by combining cashew phenol-modified phenolic amine with polyamide adduct, and adding 1% cashew phenol-modified phenolic amine and polyamide adduct by weight of fumed silica. The preparation method of the self-reinforced elastic epoxy resin is as follows: elastic nano-vulcanized rubber epoxy particles, silane coupling agent, liquid epoxy resin E44, and organic bentonite are mixed in a mass ratio of (6-14):(0.2-0.9):(30-70):(0.05-0.15); using a high-speed disperser, the mixture is dispersed at a speed of 1000-1500 r / min for a period of time to completely disperse the elastic nano-vulcanized rubber epoxy particles in the liquid epoxy resin, thereby obtaining the self-reinforced elastic epoxy resin. The preparation method of the elastic nano-vulcanized rubber epoxy particles is as follows: elastic nano-vulcanized rubber powder and solid epoxy resin E20 are mixed evenly at a mass ratio of (0.8~1.3):2, and added to a mixture containing ethylene glycol butyl ether and xylene, wherein the mass ratio of ethylene glycol butyl ether to xylene is (0.5~1.5):

1. Dispersant and silane coupling agent are added dropwise at a mass ratio of (2.5~4.5):1, ultrasonically dispersed for a period of time, then heated and refluxed for a period of time, cooled and filtered, and the filter is placed in an oven for baking. After the product is dried, it is ground to 325-500 mesh particles to obtain elastic nano-vulcanized rubber epoxy particles. The modified amine mixture is prepared as follows: fumed silica is placed in an oven and baked for a period of time. After baking, it is taken out, sealed in an aluminum foil bag, and a moisture content test is performed to ensure that the moisture content is ≤1%, thus obtaining dried fumed silica. Cashew phenol-modified phenolic amine and polyamide adduct are weighed and mixed in a dispersion tank according to a mass ratio of (5-9):

1. The mixture is dispersed and stirred, and n-butanol is added, wherein the mass ratio of n-butanol to polyamide adduct is (0.6-1.3):

1. The dried fumed silica is then added while stirring. After the addition is complete, the mixture is dispersed for a period of time. The dispersed sample is placed in a water bath at 70-90℃ and kept at a constant temperature for a period of time to obtain the modified amine mixture.

2. The quick-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings according to claim 1, characterized in that, The elastic nano-vulcanized rubber powder is composed of one or more of nitrile rubber, acrylate rubber, halogenated butyl rubber and EPDM rubber in any proportion.

3. The quick-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings according to claim 1, characterized in that: The cashew phenol-modified phenolic amine is composed of one or more of JT-6025, HARD2500, CR205 and SM2016 in any proportion.

4. The quick-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings according to claim 1, characterized in that: The polyamide adduct is one or more of BS853N, CR-6118-70 and Sunmide 353N in any proportion.

5. The quick-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings according to claim 1, characterized in that: The defoamer is one or more of Defom6800, BYK-A530, UNIQFOAM 272S and tego Foamex N in any proportion; The dispersant is one or more of BYK-AT203, BYK-220S, UNIQSPERSE 745S and UNIQSPERSE 710S in any proportion; The filler material is composed of one or more of the following: talc powder (325 mesh), barite powder (325 mesh), feldspar powder (800 mesh), and wollastonite powder (800 mesh), combined in any proportion. The anti-rust pigment is composed of one or more of the following in any proportion: white iron-titanium powder (800 mesh), gray iron-titanium powder (500 mesh), mica iron oxide gray, and titanium dioxide. The low-viscosity reactive diluent is composed of one or more of alkyl glycidyl ether, glycerol glycidyl ether and glycidyl tert-carbonate in any proportion. The solvent is one or more of xylene, n-butanol, butyl acetate, benzyl alcohol, 100# solvent oil and 200# solvent oil in any proportion; The accelerator is composed of one or more of 2,4,6-tris(dimethylaminomethyl)phenol, triethanolamine, and N-p-chlorophenyl-N,N'-dimethylurea in any proportion; The thixotropic agent is composed of one or more of polyamide wax, polyolefin wax, organobentonite, modified hydrogenated castor oil, and BYK-410 in any proportion.

6. The quick-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings according to claim 1, characterized in that: The silane coupling agent is one or more of γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, and KH-560 in any proportion.

7. A method for preparing a fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings according to any one of claims 1-6, characterized in that, Includes the following steps: The preparation method of component A is as follows: Weigh the raw materials according to the proportion, take the reinforced elastic epoxy resin and add it to the dispersion tank, add the defoamer, dispersant, silane coupling agent, low viscosity reactive diluent and part of the solvent, disperse at a speed of 600-900 r / min to obtain mixture I; Under stirring at 200-400 r / min, gradually add the rust-preventive pigment, extender filler and thixotropic agent to mixture I, disperse at 1200-1500 r / min, wait for the system temperature to rise to 55-60℃, keep it at that temperature for a period of time, and when the fineness is ≤90μm, adjust the viscosity with the remaining solvent to meet the requirements, filter with an 80 mesh sieve, and package by weight to obtain component A; The preparation method for component B is as follows: Add the required amount of the modified amine mixture to a dispersion tank, add the solvent and accelerator, disperse at high speed until uniform dispersion, filter through an 80-mesh sieve, and package to obtain component B; The paint is prepared by mixing components A and B in a mass ratio of 4 to 9:1 and then stirring until homogeneous to obtain the fast-drying, high-toughness epoxy micaceous iron oxide intermediate paint for bridge bearings.

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