Fireproof and corrosion-resistant coating for metal box body of compression garbage truck and preparation method thereof

Abstract

The application discloses a fireproof and corrosion-resistant coating for a metal box body of a compression garbage truck and a preparation method thereof, and belongs to the technical field of fireproof coatings. The fireproof and corrosion-resistant coating for the metal box body of the compression garbage truck is obtained by coating fireproof and corrosion-resistant paint on the surface of a processed metal box body of a compression garbage truck and solidifying the coating. The raw material components of the fireproof and corrosion-resistant paint include, in terms of mass fractions, 28-42 mass fractions of epoxy resin, 12-18 mass fractions of active diluent, 2.5-5 mass fractions of modified filler, 8-20 mass fractions of flame retardant, 0.1-1 mass fractions of defoaming agent, 0.1-1 mass fractions of dispersing agent, 0.1-1 mass fractions of leveling agent and 8-12 mass fractions of curing agent. The curing agent includes a polyamide curing agent obtained by reacting diamine monomers and dicarboxylic acid monomers and then reacting with 6-acetylpyridine-2-carboxylic acid. The dicarboxylic acid monomers include 1H-pyrrole-3,4-dicarboxylic acid. The fireproof and corrosion-resistant coating for the metal box body of the compression garbage truck prepared by the application has good fireproof and corrosion-resistant performances.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fireproof coating, in particular to a fireproof and corrosion-resistant coating for a metal box body of a compression garbage truck and a preparation method thereof. BACKGROUND

[0002] As a key equipment in the urban environmental sanitation system, the metal box body of a compression garbage truck is exposed to a complex and harsh working environment for a long time, and needs to withstand frequent mechanical impact and friction, as well as multiple erosion factors such as high humidity, high salt, acid and alkaline waste leachate, and high temperature. Especially during the garbage compression process, the local temperature may rise significantly, and the garbage often contains flammable organic matter, which poses a potential threat to the operation safety of the vehicle under certain conditions. Therefore, improving the fireproof performance and corrosion resistance of the metal box body of a compression garbage truck has become a key technical requirement to ensure the service life, operation safety and reduce the maintenance cost of the equipment.

[0003] At present, ordinary corrosion-resistant coatings or single-function coatings are commonly used for surface protection of the box body of a compression garbage truck. Although these coatings can delay the corrosion of the metal substrate to some extent, they have limited protective effect when facing strong corrosive media such as chloride ions, sulfides and organic acids, and are prone to failure phenomena such as blistering, peeling and pitting. At the same time, traditional coatings mostly do not have flame-retardant or high-temperature-resistant properties, and are difficult to effectively insulate heat transfer and inhibit flame spread in fire or local high-temperature environments, which cannot meet the increasingly stringent safety standards.

[0004] Therefore, it is urgent to develop a compression garbage truck metal box body coating with excellent fireproof performance and strong corrosion resistance, which can significantly improve the comprehensive protection capability of the metal box body of a compression garbage truck under complex working conditions, thereby prolonging the service life of the equipment and improving the operation safety. SUMMARY

[0005] The present application aims to provide a fireproof and corrosion-resistant coating for a metal box body of a compression garbage truck and a preparation method thereof to solve the technical problems mentioned in the background.

[0006] The technical solution to achieve the purpose of the present application is:

[0007] In a first aspect, the present application provides a fireproof and corrosion-resistant coating for a metal box body of a compression garbage truck, which is obtained by coating a fireproof and corrosion-resistant coating on the surface of a treated metal box body of a compression garbage truck and then solidifying it. The raw material components of the fireproof and corrosion-resistant coating include, by mass fraction, 28-42 mass parts of epoxy resin, 12-18 mass parts of active diluent, 2.5-5 mass parts of modified filler, 8-20 mass parts of flame retardant, 0.1-1 mass part of defoaming agent, 0.1-1 mass part of dispersing agent, 0.1-1 mass part of leveling agent, and 8-12 mass parts of curing agent.

[0008] Furthermore, the curing agent includes a polyamide curing agent obtained by reacting a diamine monomer and a dicarboxylic acid monomer with 6-acetylpyridine-2-carboxylic acid for end-capping, and a diamine curing agent.

[0009] Furthermore, the dicarboxylic acid monomer includes 1H-pyrrole-3,4-dicarboxylic acid.

[0010] Furthermore, the modified filler is obtained by modifying hexagonal boron nitride with N-(3-trimethoxysilylpropyl)pyrrole.

[0011] Furthermore, the flame retardant comprises hexa(4-aldehyde phenoxy)cyclotriphosphazene.

[0012] Secondly, the present invention provides a method for preparing a fire-resistant and corrosion-resistant coating for a compressed garbage truck metal body as described in the first aspect, the preparation steps of which are as follows:

[0013] (1) Material preparation;

[0014] (2) Mix the polyamide curing agent and flame retardant, add 170-340 parts by weight of methanol and 160-320 parts by weight of ammonia water, stir for 60-90 min, then add 24-36 parts by weight of potassium hydroxide solution, stir and react for 23-25 ​​h, then filter, wash and dry to obtain mixture I;

[0015] (3) Disperse mixture I into 200-400 parts by weight of ethanol aqueous solution, then add modified filler and continue ultrasonic dispersion for 2-4 hours, then add 20-30 parts by weight of deionized water containing 3-7 parts by weight of ammonium persulfate, react at 2-5℃ for 11-13 hours, then filter, wash, dry, grind and sieve to obtain mixture II;

[0016] (4) Mix epoxy resin and reactive diluent and stir and disperse for 10-15 minutes. Then add dispersant, defoamer and leveling agent and continue stirring and dispersing for 5-15 minutes. Then add mixture II and the remaining curing agent and stir for 30-35 minutes. Then apply it to the surface of the treated compressed garbage truck metal box and cure it to obtain a fireproof and corrosion resistant compressed garbage truck metal box coating.

[0017] Furthermore, the polyamide curing agent accounts for 15-25 wt% of the total mass of the curing agent.

[0018] Further, the preparation steps of the polyamide curing agent are as follows: 1H-pyrrole-3,4-dicarboxylic acid and terephthalic acid are added to deionized water and stirred and dispersed for 60-90 min, then diamine monomer is added and stirring is continued for 1-2 h. Subsequently, 6-acetylpyridine-2-carboxylic acid is added and stirring is continued for 1-2 h. Then, under nitrogen protection and 0.2-0.3 MPa, the temperature and pressure are raised to 200-210℃ and 1.4-1.6 MPa, respectively, and the pressure is stabilized for 30 minutes. After ~40 min, the pressure is reduced to normal and a vacuum is drawn. The reaction continues at a temperature not exceeding 230℃ for 50~70 min. After cooling, the material is discharged to obtain a polyamide curing agent. The molar ratio of 1H-pyrrole-3,4-dicarboxylic acid, terephthalic acid, diamine monomer, and 6-acetylpyridine-2-carboxylic acid is (1~2):(8~9):(11~12):(1~3). The mass of deionized water is 8~12 times the mass of 1H-pyrrole-3,4-dicarboxylic acid.

[0019] Further, the preparation steps of the modified filler are as follows: 0.4~0.6 parts by weight of N-(3-trimethoxysilylpropyl)pyrrole are added to 80~100 parts by weight of an ethanol aqueous solution with a volume ratio of 49:1, and after sonication for 20 min, 10 parts by weight of exfoliated hexagonal boron nitride nanosheets are added. The mixture is stirred at 75~85℃ for 5~7 h, then filtered, washed, and dried to obtain the modified filler.

[0020] Furthermore, the processed metal box of the compressed garbage truck is obtained by grinding and cleaning the metal box of the compressed garbage truck.

[0021] By adopting the above technical solution, the present invention has the following beneficial effects:

[0022] (1) The fireproof and corrosion-resistant metal box coating of the compressed garbage truck of the present invention is formed by applying a fireproof and corrosion-resistant coating made of raw materials such as epoxy resin, reactive diluent, modified filler, flame retardant, defoamer, dispersant, leveling agent and curing agent to the metal box of the compressed garbage truck after surface treatment, and then curing it; the obtained coating has both excellent fireproof performance and strong corrosion resistance.

[0023] (2) The curing agent of the present invention includes a polyamide curing agent and a diamine curing agent obtained by reacting diamine monomer and dicarboxylic acid monomer and then reacting with 6-acetylpyridine-2-carboxylic acid for end capping; by introducing nitrogen-containing heterocyclic structures pyridine ring and pyrrole ring into the polyamide main chain, the fire resistance and corrosion resistance of the coating are significantly enhanced; among them, the pyridine ring has high thermal stability and char formation tendency, and can promote the formation of a dense carbon layer on the coating surface under high temperature or flame action, effectively isolating heat and oxygen transfer, thereby inhibiting the spread of combustion; at the same time, the nitrogen atoms in the pyridine and pyrrole structures are rich in lone pair electrons, which can form coordination with the surface of the metal substrate, enhance the adhesion of the coating, and inhibit the dissolution of metal ions through adsorption or passivation mechanisms in the corrosive medium environment, thereby improving the corrosion resistance of the coating.

[0024] (3) The modified filler of the present invention uses N-(3-trimethoxysilylpropyl)pyrrole-modified hexagonal boron nitride. By grafting organic molecules containing pyrrole rings and hydrolyzable silane groups onto the surface of hexagonal boron nitride, its compatibility and dispersion stability in epoxy resin matrix are significantly improved, effectively avoiding the agglomeration problem caused by strong van der Waals forces in traditional hexagonal boron nitride. The uniformly dispersed lamellar hexagonal boron nitride forms a "maze effect" in the coating, which significantly prolongs the diffusion path of corrosive media into the metal substrate, thereby greatly improving the coating. The coating exhibits excellent corrosion resistance. Furthermore, hexagonal boron nitride possesses superior thermal conductivity and high-temperature stability, enabling rapid conduction and dispersion of localized heat in fire or high-temperature environments. This inhibits hotspot accumulation and synergistically promotes the formation of a dense carbon layer, enhancing the coating's thermal insulation and flame-retardant capabilities. In addition, the introduction of pyrrole structures not only strengthens the interfacial bonding between the filler and the resin matrix, but its electron-rich properties also contribute to enhancing the coating's passivation protection of the metal surface, effectively improving the fire resistance and corrosion resistance of the metal body coating for fire-resistant and corrosion-resistant compressed garbage trucks.

[0025] (4) The flame retardant of the present invention includes hexa(4-aldehyde phenoxy)cyclotriphosphazene, whose molecular structure has both phosphorus and nitrogen synergistic flame retardant elements and aromatic aldehyde functional groups, which can significantly improve the fire resistance of the metal box coating of fireproof and corrosion resistant compressed garbage truck; under heated or combustion conditions, the flame retardant first releases phosphorus-containing free radicals through the cyclotriphosphazene skeleton, captures highly active H· and OH· free radicals, and interrupts the gas phase combustion chain reaction; at the same time, its nitrogen-containing structure decomposes at high temperature to produce non-combustible gases such as ammonia and nitrogen, dilutes combustible gases and reduces oxygen concentration, further inhibiting flame propagation.

[0026] (5) In the preparation of the coating for the metal box of the fireproof and corrosion-resistant compressed garbage truck of the present invention, the polyamide curing agent and the flame retardant are first mixed and reacted to obtain mixture I; then mixture I is mixed and reacted with the modified filler to obtain mixture II, and finally mixed with the remaining raw material components to obtain the fireproof and corrosion-resistant coating; wherein, the acetylpyridine of the end chain of the polyamide curing agent reacts with benzaldehyde in the flame retardant, and ammonia water is introduced during the reaction to participate in the reaction, forming a rigid and highly thermally stable terpyridine structure in situ, generating a branched polyamide curing agent, which not only enhances the crosslinking density and thermal stability of the molecular chain, but its nitrogen-rich heterocyclic characteristics can also promote char formation and release non-combustible gases during combustion, thereby significantly improving the fireproof performance of the coating; at the same time, the terpyridine structure has a strong coordination ability to the metal surface, which helps to enhance the adhesion and anti-corrosion barrier effect of the coating; then the mixture The pyrrole in compound I and the pyrrole in the modified filler undergo a polymerization reaction under oxidizing conditions to form polypyrrole. Polypyrrole not only possesses good chemical stability and certain electrical conductivity, but its abundant nitrogen atoms in its molecular chain can also form coordination adsorption with the metal substrate, enhancing the passivation protection of the metal surface by the coating, thereby improving corrosion resistance. The formed polypyrrole network can interpenetrate with the aforementioned branched polyamide curing agent containing a terpyridine structure, constructing a semi-interpenetrating network structure, which significantly improves the crosslinking density and cohesive strength of the coating, effectively improving mechanical properties such as adhesion, flexibility, and impact resistance. At the same time, under high temperature or fire conditions, polypyrrole can participate in the formation of the char layer, synergistically promoting the formation of a dense, continuous, and thermally stable expanded char layer with phosphazene flame retardants and the terpyridine structure, enhancing the heat insulation and oxygen barrier effects, thereby further improving fire resistance. Detailed Implementation

[0027] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with specific implementation methods.

[0028] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0029] The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0030] The epoxy resin used is epoxy resin E-51;

[0031] The reactive diluent used is AGE (Advanced Glycol Permeable).

[0032] The dispersant used is BYK-P104;

[0033] The leveling agent used is BYK333;

[0034] The defoamer used is BYK-066N;

[0035] The preparation steps of the exfoliated hexagonal boron nitride nanosheets are as follows: 15 parts by mass of D-glucose are dissolved in 20 parts by mass of water, 3 parts by mass of hexagonal boron nitride are added, ultrasonically for 20 min, ball milled for 12 h, then centrifuged for 10 min, washed 3 times with deionized water, and vacuum dried at 60 °C to constant weight to obtain the exfoliated hexagonal boron nitride nanosheets.

[0036] The diamine curing agent used is 4,4'-diaminodiphenylmethane.

[0037] Example 1

[0038] A method for preparing a fire-resistant and corrosion-resistant coating for the metal body of a compressed garbage truck, comprising the following steps:

[0039] (1) Polish the surface of the metal box of the compressed garbage truck with 400 grit and 1500 grit sandpaper in sequence until it has a metallic luster. Then clean it with ethanol to remove the surface protective oil. Finally, polish off the residual iron filings and dry it to obtain the processed metal box of the compressed garbage truck.

[0040] (2) Mix 1.2 parts by weight of polyamide curing agent and 8 parts by weight of flame retardant, add 170 parts by weight of methanol and 160 parts by weight of 28% ammonia water, stir for 60 min, then add 24 parts by weight of 15 wt% potassium hydroxide solution, stir and react for 23 h, filter, wash 6 times with water and methanol, and vacuum dry at 60 °C for 12 h to obtain mixture I;

[0041] (3) Disperse mixture I into 200 parts by mass of an ethanol aqueous solution with a volume ratio of 1:1, then add 2.5 parts by mass of modified filler and continue ultrasonic dispersion for 2 hours. Then add 20 parts by mass of deionized water containing 3 parts by mass of ammonium persulfate, react at 2°C for 11 hours, then filter, wash, dry at 40°C, grind, and pass through a 400-mesh sieve to obtain mixture II.

[0042] (4) Mix 28 parts by weight of epoxy resin and 12 parts by weight of reactive diluent and stir and disperse at 2000 r / min for 10 min. Then add 0.1 parts by weight of dispersant, 0.1 parts by weight of defoamer and 0.1 parts by weight of leveling agent and continue stirring and dispersing for 5 min. Then add mixture II and 6.8 parts by weight of diamine curing agent and stir for 30 min. Then coat it on the surface of the metal box of the compressed garbage truck after treatment and cure at room temperature for 24 h. Then bake in an oven at 100℃ for 2 h to obtain a 45 μm thick fireproof and corrosion resistant compressed garbage truck metal box coating.

[0043] The preparation steps of the polyamide curing agent are as follows: 1H-pyrrole-3,4-dicarboxylic acid and terephthalic acid are added to deionized water and stirred and dispersed for 60 min. Then, diamine monomer is added and stirring is continued for 1 h. Subsequently, 6-acetylpyridine-2-carboxylic acid is added and stirring is continued for 1 h. Then, under nitrogen protection and 0.2 MPa, the temperature and pressure are raised to 200℃ and 1.4 MPa respectively. After stabilizing the pressure for 30 min, the pressure is reduced to normal and vacuum is drawn. The reaction is continued at a temperature not exceeding 230℃ for 50 min. After cooling, the material is discharged to obtain the polyamide curing agent. The molar ratio of 1H-pyrrole-3,4-dicarboxylic acid, terephthalic acid, diamine monomer, and 6-acetylpyridine-2-carboxylic acid is 1:9:11:1. The mass of deionized water is 8 times the mass of 1H-pyrrole-3,4-dicarboxylic acid.

[0044] The preparation steps of the modified filler are as follows: 0.4 parts by mass of N-(3-trimethoxysilylpropyl)pyrrole are added to 80 parts by mass of an ethanol aqueous solution with a volume ratio of 49:1. After sonication for 20 min, 10 parts by mass of exfoliated hexagonal boron nitride nanosheets are added. The mixture is stirred at 75°C for 5 h, then filtered, washed, and dried to obtain the modified filler.

[0045] Example 2

[0046] A method for preparing a fire-resistant and corrosion-resistant coating for the metal body of a compressed garbage truck, comprising the following steps:

[0047] (1) Polish the surface of the metal box of the compressed garbage truck with 400 grit and 1500 grit sandpaper in sequence until it has a metallic luster. Then clean it with ethanol to remove the surface protective oil. Finally, polish off the residual iron filings and dry it to obtain the processed metal box of the compressed garbage truck.

[0048] (2) Mix 2.1 parts by weight of polyamide curing agent and 14 parts by weight of flame retardant, add 255 parts by weight of methanol and 240 parts by weight of 28% ammonia water, stir for 75 min, then add 30 parts by weight of 15 wt% potassium hydroxide solution, stir and react for 24 h, filter, wash with water and methanol 6 times, and vacuum dry at 60 °C for 12 h to obtain mixture I;

[0049] (3) Disperse mixture I into 300 parts by mass of an ethanol aqueous solution with a volume ratio of 1:1, then add 3.8 parts by mass of modified filler and continue ultrasonic dispersion for 3 hours. Then add 25 parts by mass of deionized water containing 5 parts by mass of ammonium persulfate, react at 4°C for 12 hours, then filter, wash, dry at 40°C, grind, and pass through a 400-mesh sieve to obtain mixture II.

[0050] (4) Mix 35 parts by weight of epoxy resin and 15 parts by weight of reactive diluent and stir and disperse at 2000 r / min for 10 min. Then add 0.5 parts by weight of dispersant, 0.5 parts by weight of defoamer and 0.5 parts by weight of leveling agent and continue stirring and dispersing for 10 min. Then add mixture II and 7.6 parts by weight of diamine curing agent and stir for 30 min. Then coat it on the surface of the treated compressed garbage truck metal box and cure at room temperature for 24 h. Then bake in an oven at 100℃ for 2 h to obtain a 45 μm thick fireproof and corrosion resistant compressed garbage truck metal box coating.

[0051] The preparation steps of the polyamide curing agent are as follows: 1H-pyrrole-3,4-dicarboxylic acid and terephthalic acid are added to deionized water and stirred and dispersed for 75 min. Then, diamine monomer is added and stirring is continued for 1.5 h. Subsequently, 6-acetylpyridine-2-carboxylic acid is added and stirring is continued for 1.5 h. Then, under nitrogen protection and 0.3 MPa, the temperature and pressure are raised to 205℃ and 1.5 MPa, respectively. After stabilizing the pressure for 35 min, the pressure is reduced to normal and vacuum is applied. The reaction is continued at a temperature not exceeding 230℃ for 60 min. After cooling, the material is discharged to obtain the polyamide curing agent. The molar ratio of 1H-pyrrole-3,4-dicarboxylic acid, terephthalic acid, diamine monomer, and 6-acetylpyridine-2-carboxylic acid is 1.5:8.5:11.5:2. The mass of deionized water is 10 times the mass of 1H-pyrrole-3,4-dicarboxylic acid.

[0052] The preparation steps of the modified filler are as follows: 0.5 parts by mass of N-(3-trimethoxysilylpropyl)pyrrole are added to 90 parts by mass of an ethanol aqueous solution with a volume ratio of 49:1. After sonication for 20 min, 10 parts by mass of exfoliated hexagonal boron nitride nanosheets are added. The mixture is stirred at 80°C for 6 h, then filtered, washed, and dried to obtain the modified filler.

[0053] Example 3

[0054] A method for preparing a fire-resistant and corrosion-resistant coating for the metal body of a compressed garbage truck, comprising the following steps:

[0055] (1) Polish the surface of the metal box of the compressed garbage truck with 400 grit and 1500 grit sandpaper in sequence until it has a metallic luster. Then clean it with ethanol to remove the surface protective oil. Finally, polish off the residual iron filings and dry it to obtain the processed metal box of the compressed garbage truck.

[0056] (2) Mix 3 parts by weight of polyamide curing agent and 20 parts by weight of flame retardant, add 340 parts by weight of methanol and 320 parts by weight of 28% ammonia water, stir for 90 min, then add 36 parts by weight of 15 wt% potassium hydroxide solution, stir and react for 25 h, filter, wash 6 times with water and methanol, and vacuum dry at 60 °C for 12 h to obtain mixture I;

[0057] (3) Disperse mixture I into 400 parts by mass of an ethanol aqueous solution with a volume ratio of 1:1, then add 5 parts by mass of modified filler and continue ultrasonic dispersion for 4 hours. Then add 30 parts by mass of deionized water containing 7 parts by mass of ammonium persulfate and react at 5°C for 13 hours. Then filter, wash, dry at 40°C, grind, and pass through a 400-mesh sieve to obtain mixture II.

[0058] (4) Mix 42 parts by weight of epoxy resin and 18 parts by weight of reactive diluent and stir and disperse at 2000 r / min for 15 min. Then add 1 part by weight of dispersant, 1 part by weight of defoamer and 1 part by weight of leveling agent and continue stirring and dispersing for 15 min. Then add mixture II and 9 parts by weight of diamine curing agent and stir for 35 min. Then coat it on the surface of the treated compressed garbage truck metal box and cure at room temperature for 24 h. Then bake in an oven at 100℃ for 2 h to obtain a 45 μm thick fireproof and corrosion resistant compressed garbage truck metal box coating.

[0059] The preparation steps of the polyamide curing agent are as follows: 1H-pyrrole-3,4-dicarboxylic acid and terephthalic acid are added to deionized water and stirred and dispersed for 90 min. Then, diamine monomer is added and stirring is continued for 2 h. Subsequently, 6-acetylpyridine-2-carboxylic acid is added and stirring is continued for 2 h. Then, under nitrogen protection and 0.3 MPa, the temperature and pressure are raised to 210℃ and 1.6 MPa, respectively. After stabilizing the pressure for 40 min, the pressure is reduced to normal and vacuum is applied. The reaction is continued at a temperature not exceeding 230℃ for 70 min. After cooling, the material is discharged to obtain the polyamide curing agent. The molar ratio of 1H-pyrrole-3,4-dicarboxylic acid, terephthalic acid, diamine monomer, and 6-acetylpyridine-2-carboxylic acid is 2:8:12:3. The mass of deionized water is 12 times the mass of 1H-pyrrole-3,4-dicarboxylic acid.

[0060] The preparation steps of the modified filler are as follows: 0.6 parts by mass of N-(3-trimethoxysilylpropyl)pyrrole are added to 100 parts by mass of an ethanol aqueous solution with a volume ratio of 49:1. After sonication for 20 min, 10 parts by mass of exfoliated hexagonal boron nitride nanosheets are added. The mixture is stirred at 85°C for 7 h, then filtered, washed, and dried to obtain the modified filler.

[0061] Comparative Example 1

[0062] The difference between Comparative Example 1 and Example 2 is that the polyamide curing agent used is commercially available polyamide 8200, while the other components and steps are the same as in Example 2.

[0063] Comparative Example 2

[0064] The difference between Comparative Example 2 and Example 2 is that the modified filler is obtained by modifying hexagonal boron nitride with 3-aminopropyltriethoxysilane, while the other components and steps are the same as in Example 2.

[0065] Comparative Example 3

[0066] The difference between Comparative Example 3 and Example 2 is that the flame retardant used is ammonium polyphosphate, while the other components and steps are the same as in Example 2.

[0067] Comparative Example 4

[0068] The difference between Comparative Example 4 and Example 2 is that the fireproof and corrosion-resistant coating is prepared by directly mixing the raw material components, while the other components and steps are the same as in Example 2.

[0069] Example of effect

[0070] Table 1 below shows the performance test results of the fireproof and corrosion-resistant metal body coatings for compressed garbage trucks in Examples 1-3 and Comparative Examples 1-4:

[0071] Table 1

[0072]

[0073] As shown in Table 1, the fireproof and corrosion-resistant metal body coatings for compressed garbage trucks prepared in Examples 1-3 have good adhesion, impact resistance, corrosion resistance, and fire resistance.

[0074] The difference between Comparative Example 1 and Example 2 is that the polyamide curing agent used is commercially available polyamide 8200 instead of the polyamide curing agent obtained by reacting diamine monomer and dicarboxylic acid monomer and then reacting with 6-acetylpyridine-2-carboxylic acid for end capping. The resulting fireproof and corrosion-resistant metal box coating of the compressed garbage truck has weaker impact resistance, corrosion resistance and fire resistance.

[0075] The difference between Comparative Example 2 and Example 2 is that the modified filler is obtained by modifying hexagonal boron nitride with 3-aminopropyltriethoxysilane instead of N-(3-trimethoxysilylpropyl)pyrrole. The resulting fireproof and corrosion-resistant metal box coating for the compressed garbage truck has weaker impact resistance, corrosion resistance and fire resistance.

[0076] The difference between Comparative Example 3 and Example 2 is that the flame retardant used is ammonium polyphosphate instead of hexa(4-aldehyde phenoxy)cyclotriphosphazene, resulting in a fireproof and corrosion-resistant metal box coating for the compressed garbage truck with weaker impact resistance, corrosion resistance, and fire resistance.

[0077] The difference between Comparative Example 4 and Example 2 is that the fire-retardant and corrosion-resistant coating is prepared by directly mixing the raw material components instead of first mixing and reacting the polyamide curing agent and flame retardant to obtain Mixture I; then mixing and reacting Mixture I with modified filler to obtain Mixture II, and finally mixing it with the remaining raw material components. The resulting fire-retardant and corrosion-resistant metal box coating for the compressed garbage truck has weaker impact resistance, corrosion resistance, and fire resistance.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fire resistant, corrosion resistant coating for a compressed refuse truck metal body, characterized in that, The fireproof and corrosion-resistant compression garbage truck metal box coating is obtained by coating a fireproof and corrosion-resistant coating on the surface of a treated compression garbage truck metal box and solidifying; the raw material components of the fireproof and corrosion-resistant coating include, in terms of mass fraction, 28-42 mass parts of epoxy resin, 12-18 mass parts of active diluent, 2.5-5 mass parts of modified filler, 8-20 mass parts of flame retardant, 0.1-1 mass part of defoaming agent, 0.1-1 mass part of dispersant, 0.1-1 mass part of leveling agent, and 8-12 mass parts of curing agent. The curing agent includes a diamine curing agent and a polyamide curing agent obtained by reacting a diamine monomer and a dicarboxylic acid monomer and then reacting with 6-acetylpyridine-2-carboxylic acid.

2. The fire resistant, corrosion resistant, compressed refuse truck metal body coating of claim 1, wherein, The modified filler is obtained by modifying hexagonal boron nitride with N-(3-trimethoxysilylpropyl)pyrrole.

3. The fire resistant, corrosion resistant, compressed refuse truck metal body coating of claim 1, wherein, The flame retardant includes hexakis(4-formylphenoxy)cyclotriphosphazene.

4. A method of producing a fire and corrosion resistant coating for a metal body of a compression garbage truck as claimed in any one of claims 1 to 3, characterised in that, The preparation steps are as follows: (1) preparing materials; (2) mixing the polyamide curing agent and the flame retardant, adding 170-340 mass parts of methanol and 160-320 mass parts of ammonia water, stirring for 60-90 min, then adding 24-36 mass parts of potassium hydroxide solution dropwise, stirring for 23-25 h, then filtering, washing, and drying to obtain mixed material I; (3) dispersing mixed material I into 200-400 mass parts of an ethanol aqueous solution, then adding the modified filler and continuing ultrasonic dispersion for 2-4 h, then adding 20-30 mass parts of deionized water containing 3-7 mass parts of ammonium persulfate, reacting at 2-5℃ for 11-13 h, then filtering, washing, drying, grinding, and sieving to obtain mixed material II; (4) mixing the epoxy resin and the active diluent, stirring and dispersing for 10-15 min, then adding the dispersant, the defoaming agent, and the leveling agent, continuing stirring and dispersing for 5-15 min, then adding mixed material II and the diamine curing agent, stirring for 30-35 min, then coating on the surface of a treated compression garbage truck metal box and solidifying to obtain the fireproof and corrosion-resistant compression garbage truck metal box coating.

5. The method of claim 4, wherein the coating is applied to the metal body of the fire- and corrosion-resistant compressed refuse truck by a process comprising: The mass fraction of the polyamide curing agent in the curing agent is 15-25 wt%.

6. The method of claim 4, wherein the coating is applied to the metal body of the fire- and corrosion-resistant compressed refuse truck by a process comprising: The preparation steps of the polyamide curing agent are as follows: 1H-pyrrole-3,4-dicarboxylic acid and terephthalic acid are added into deionized water and stirred and dispersed for 60-90 min, then diamine monomers are added, and stirring is continued for 1-2 h, then 6-acetylpyridine-2-carboxylic acid is added, and stirring is continued for 1-2 h, then the temperature and pressure are respectively increased to 200-210 DEG C and 1.4-1.6 MPa under nitrogen protection and 0.2-0.3 MPa, the pressure is stabilized for 30-40 min, then the pressure is reduced to normal pressure and vacuum is drawn, and the reaction is continued for 50-70 min at a temperature not higher than 230 DEG C, and the product is discharged after cooling, to obtain the polyamide curing agent; wherein the molar ratio of 1H-pyrrole-3,4-dicarboxylic acid, terephthalic acid, diamine monomers and 6-acetylpyridine-2-carboxylic acid is (1-2):(8-9):(11-12):(1-3); and the mass of deionized water is 8-12 times the mass of 1H-pyrrole-3,4-dicarboxylic acid.

7. The method of claim 4, wherein the coating is applied to the metal body of the fire- and corrosion-resistant compressed refuse truck by a process comprising: The preparation steps of the modified filler are as follows: 0.4-0.6 parts by mass of N-(3-trimethoxysilylpropyl)pyrrole is added into 80-100 parts by mass of an ethanol aqueous solution with a volume ratio of 49:1, 10 parts by mass of exfoliated hexagonal boron nitride nanosheets subjected to peeling treatment are added after ultrasonic treatment for 20 min, and stirring is carried out at 75-85 DEG C for 5-7 h, then the product is filtered, washed and dried, to obtain the modified filler.

8. The method of claim 4, wherein the coating is applied to the metal body of the fire- and corrosion-resistant compressed refuse truck by a process comprising: The treated metal box body of the compression garbage truck is obtained by polishing and cleaning the metal box body of the compression garbage truck.

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