A temperature-resistant and pressure-resistant anticorrosive coating for pipelines and a preparation method thereof

Abstract

The application discloses a kind of pipeline temperature-resistant pressure-resistant anticorrosive coating and preparation method thereof, it is related to engineering coating technical field, including the following weight parts components: 50-60 parts of phenolic epoxy resin, 5-10 parts of curing agent, 6-8 parts of ethylene glycol diglycidyl ether, 2.6-3.3 parts of diethylene triamine propyl trimethoxysilane, 2.2-3.5 parts of modified short carbon fiber, 0.9-1.2 parts of aluminum tripolyphosphate, 0.12-0.25 parts of tourmaline, 0.02-0.35 parts of phenol sulfonic acid.The application has the adsorption capacity and porous characteristics of tourmaline firmly combined with each component, by modified short carbon fiber and tourmaline combination adsorption, so as to significantly enhance the pressure resistance of the anticorrosive coating, and make the anticorrosive coating anticorrosive performance of aluminum tripolyphosphate and tourmaline synergistically improved, to realize the purpose of low cost, high strength, high temperature resistance and effective corrosion protection.

Description

Technical Field

[0001] This application relates to the field of engineering coatings technology, and in particular to a temperature- and pressure-resistant anti-corrosion coating for pipelines and its preparation method. Background Technology

[0002] In modern life, people's requirements for various pipe materials closely related to their lives have increased with the improvement of living standards. For example, the temperature resistance, pressure resistance, and corrosion resistance of water supply pipes, drainage pipes, heating pipes, gas pipes, industrial pipes, and communication and power transmission pipes are all receiving attention. To address the problem of short pipe service life caused by insufficient corrosion resistance, pressure resistance, and temperature resistance, effective methods such as galvanizing and chrome plating are currently used to improve pressure resistance, temperature resistance, and corrosion resistance while controlling costs. However, for highly corrosive industrial pipes, expensive stainless steel pipes are required.

[0003] For example, Chinese patent application CN114688383A discloses a method for corrosion prevention and repair of a temperature- and pressure-resistant composite pipe lining an oil-gas-water mixed transportation pipeline. This method uses stainless steel short sections welded to both ends of the steel pipe to achieve corrosion prevention and repair while connecting the steel pipe.

[0004] However, although stainless steel has certain corrosion resistance, its strength and temperature resistance are insufficient, so its application scenarios are limited and its cost is high, making it difficult to use as the main pipe material for large-scale laying and utilization, which needs to be improved. Summary of the Invention

[0005] In view of this, the first objective of this application is to provide a temperature- and pressure-resistant anti-corrosion coating for pipelines, achieving the goals of low cost, high strength, high temperature resistance, and effective corrosion protection. The specific solution is as follows:

[0006] A temperature- and pressure-resistant anti-corrosion coating for pipelines comprises the following components in parts by weight: 50-60 parts of phenolic epoxy resin, 5-10 parts of curing agent, 6-8 parts of ethylene glycol diglycidyl ether, 2.6-3.3 parts of diethylenetriaminepropyltrimethoxysilane, 2.2-3.5 parts of modified chopped carbon fiber, 0.9-1.2 parts of aluminum tripolyphosphate, 0.12-0.25 parts of tourmaline, and 0.02-0.35 parts of phenol sulfonic acid.

[0007] Preferably, the curing agent is an aromatic amine and benzyl alcohol in a weight ratio of 3.6-8.2:1.

[0008] Preferably, the aromatic amine is 4,4'-diaminodiphenylmethane or m-phenylenediamine.

[0009] Preferably, the tourmaline is tourmaline powder that has been calcined at high temperature and ground, and the particle size of the tourmaline powder is 5-20 μm.

[0010] Preferably, it further includes an auxiliary agent consisting of 0-0.3 parts by weight of defoamer and 0-0.3 parts by weight of dispersant.

[0011] Preferably, the defoamer is silicone oil defoamer HW-302; the dispersant is dispersant BYK110.

[0012] A second objective of this invention is to provide a method for preparing the temperature- and pressure-resistant anti-corrosion coating for pipelines as described above, comprising the following steps:

[0013] Step 1: Place 2.6-3.3 parts by weight of diethylenetriaminopropyltrimethoxysilane and 0.9-1.2 parts by weight of aluminum tripolyphosphate into a mixing vessel filled with nitrogen to a pressure of 1-5 atmospheres. Mix and stir at a high temperature of 60-65℃ for 30-60 minutes, then cool to 5-10℃ and filter to obtain the modified aluminum tripolyphosphate and diethylenetriaminopropyltrimethoxysilane residue.

[0014] Step 2: Mix 50-60 parts by weight of phenolic epoxy resin with the remaining liquid of diethylenetriaminepropyltrimethoxysilane and react to obtain modified phenolic epoxy resin.

[0015] Step 3: Mix and stir 6-8 parts by weight of ethylene glycol diglycidyl ether, 0.12-0.25 parts by weight of tourmaline and modified phenolic epoxy resin to obtain mixed resin A.

[0016] Step 4: Add the modified aluminum tripolyphosphate from Step 1 and 2.2-3.5 parts by weight of modified short-cut carbon fiber into mixed resin A, and mix and stir to obtain mixed resin B.

[0017] Step 5: Add 5-10 parts by weight of curing agent, 0.02-0.35 parts by weight of phenol sulfonic acid, 0-0.3 parts by weight of defoamer and 0-0.3 parts by weight of dispersant to mixed resin B, mix and stir to obtain mixture B.

[0018] Preferably, in step 2, the phenolic epoxy resin is heated to 60-65°C under inert gas conditions, and then the remaining liquid of diethylenetriaminepropyltrimethoxysilane is added dropwise while stirring is maintained. After the addition is completed, the mixture is kept at the temperature for 2 hours and then cooled to room temperature to obtain the modified phenolic epoxy resin.

[0019] Preferably, the specific surface area of ​​the tourmaline is 130-200 m² / g. 2 / g.

[0020] Preferably, in step 4, the modified short-cut carbon fiber is obtained by mixing carbon fiber with 4-(triphenylphospho)butane-1-sulfonate and distilled water in a mass ratio of 1:0.01-0.2:0-100, ultrasonically and at high temperature for 0.1-2 hours, controlling the high temperature at 70-80℃, and then centrifuging.

[0021] As can be seen from the above scheme, this application provides a temperature- and pressure-resistant anti-corrosion coating for pipelines and its preparation method. The temperature- and pressure-resistant anti-corrosion coating for pipelines is obtained by using phenolic epoxy resin, ethylene glycol diglycidyl ether, diethylenetriaminepropyltrimethoxysilane, modified short-cut carbon fiber, aluminum tripolyphosphate, and tourmaline under the action of a curing agent and phenol sulfonic acid. This allows the adsorption capacity and porous properties of tourmaline to firmly combine with the components, and the pressure resistance of the anti-corrosion coating is significantly enhanced by the combination and adsorption of tourmaline by the modified short-cut carbon fiber. The aluminum tripolyphosphate and tourmaline synergistically improve the anti-corrosion performance of the coating. The preparation method of this temperature- and pressure-resistant anti-corrosion coating for pipelines involves modifying phenolic epoxy resin to introduce the amino groups from diethylenetriaminepropyltrimethoxysilane into the resin, thereby improving the uneven distribution of aluminum tripolyphosphate. This ensures that the modified aluminum tripolyphosphate, obtained by modifying diethylenetriaminepropyltrimethoxysilane, is orderly dispersed in the modified phenolic epoxy resin, avoiding agglomeration. Simultaneously, modified short-cut carbon fibers, obtained by treating carbon fibers with 4-(triphenylphospho)butane-1-sulfonate, activate the carbon fibers, thereby increasing the bonding strength between the modified short-cut carbon fibers and the mixed resin A. The addition of tourmaline powder and modified short-cut carbon fibers forms a dense waterproof layer with the phenolic epoxy resin, thus improving the anti-corrosion performance. Phenolic sulfonic acid binds to the phenolic epoxy resin through hydroxyl groups, further enhancing the anti-corrosion ability of the coating. By forming chemical bonds through hydrogen bonding and dehydration condensation, the resin material and the substrate can be effectively bonded together, thereby improving the adhesion strength of the anti-corrosion coating and avoiding the problem of reduced anti-corrosion performance due to decreased adhesion strength. Detailed Implementation

[0022] The technical solutions described below in conjunction with the embodiments of this application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] It should be mentioned that the silicone oil defoamer HW-302 was purchased from Guangdong Hualitai Chemical Co., Ltd.

[0024] The following will provide a detailed description of the temperature- and pressure-resistant anti-corrosion coating for pipelines and its preparation method.

[0025] A temperature- and pressure-resistant anti-corrosion coating for pipelines comprises the following components in parts by weight: 50-60 parts of phenolic epoxy resin, 5-10 parts of curing agent, 6-8 parts of ethylene glycol diglycidyl ether, 2.6-3.3 parts of diethylenetriaminepropyltrimethoxysilane, 2.2-3.5 parts of modified chopped carbon fiber, 0.9-1.2 parts of aluminum tripolyphosphate, 0.12-0.25 parts of tourmaline, 0.02-0.35 parts of phenol sulfonic acid, and 0-0.6 parts of additives.

[0026] The curing agent is an aromatic amine and benzyl alcohol in a weight ratio of 3.6-8.2:1, wherein the aromatic amine is 4,4'-diaminodiphenylmethane or m-phenylenediamine. Tourmaline is tourmaline powder that has been calcined at high temperature and ground, and the particle size of the tourmaline powder is 5-20 μm. The additives are 0-0.3 parts by weight of defoamer and 0-0.3 parts by weight of dispersant. In the embodiments of this application, the defoamer is silicone oil defoamer HW-302, and the dispersant is dispersant BYK110.

[0027] A method for preparing a temperature- and pressure-resistant anti-corrosion coating for pipelines includes the following steps:

[0028] Step 1: Place 2.6-3.3 parts by weight of diethylenetriaminopropyltrimethoxysilane and 0.9-1.2 parts by weight of aluminum tripolyphosphate into a mixing vessel filled with nitrogen to a pressure of 1-5 atmospheres. Mix and stir at a high temperature of 60-65℃ for 30-60 minutes, then cool to 5-10℃ and filter to obtain the modified aluminum tripolyphosphate and diethylenetriaminopropyltrimethoxysilane residue.

[0029] Step 2: Place 50-60 parts by weight of phenolic epoxy resin in a reaction vessel under inert gas conditions, heat the reaction vessel to 60-65°C, and then gradually add the remaining liquid of diethylenetriaminepropyltrimethoxysilane to the reaction vessel while stirring. After the addition is completed, keep it at the temperature for 2 hours and then cool it to room temperature to obtain modified phenolic epoxy resin.

[0030] Step 3: Mix and stir 6-8 parts by weight of ethylene glycol diglycidyl ether, 0.12-0.25 parts by weight of tourmaline powder and modified phenolic epoxy resin to obtain mixed resin A.

[0031] Step 4: Add the modified aluminum tripolyphosphate from Step 1 and 2.2-3.5 parts by weight of modified short-cut carbon fiber into mixed resin A, and mix and stir to obtain mixed resin B.

[0032] Step 5: Add 5-10 parts by weight of curing agent, 0.02-0.35 parts by weight of phenol sulfonic acid, 0-0.3 parts by weight of defoamer and 0-0.3 parts by weight of dispersant to mixed resin B, mix and stir to obtain mixture B.

[0033] Tourmaline has a specific surface area of ​​130-200 m². 2 / g. Therefore, by distributing tourmaline in the modified phenolic epoxy resin to improve the density of the waterproof layer, the corrosive chloride ions are effectively prevented from affecting the anti-corrosion performance of the coating. Meanwhile, the modified short-cut carbon fiber is obtained by mixing carbon fiber with 4-(triphenylphosphine)butane-1-sulfonate and distilled water at a mass ratio of 1:0.01-0.2:0-100, ultrasonically and at high temperature for 0.1-2 hours, controlling the high temperature at 70-80℃, and then centrifuging. Therefore, the 4-(triphenylphosphine)butane-1-sulfonate modification treatment on the carbon fiber surface promotes the bonding between the modified short-cut carbon fiber and the modified phenolic epoxy resin, and the tourmaline powder is orderly distributed in the coating. This avoids agglomeration and uneven distribution while promoting cross-linking between the active groups of each component to form a multi-dimensional structure, thereby improving density, pressure resistance, anti-corrosion performance, and adhesion.

[0034] In step 4 of the preparation method of the temperature- and pressure-resistant anti-corrosion coating for pipelines, the mixture is stirred in a high-speed mixing pot, and the stirring time is controlled to be 5 minutes and the side crushing is opened for at least 3 minutes. At the same time, in step 5, the B material mixture needs to be extruded through a twin-screw extruder, and a 90° toothed screw is used in the homogenization section of the twin-screw extruder. The temperature of the plasticizing section is controlled to be 100° and the temperature of the homogenization section is controlled to be 120°. The extruded melt is cooled by the cooling roller and then conveyed to the crushing roller for preliminary crushing to obtain sheet material. The sheet material is then ground and screened in an ACM mill to obtain the finished anti-corrosion coating.

[0035] Example 1

[0036] A temperature- and pressure-resistant anti-corrosion coating for pipelines comprises the following components in parts by weight: 50 parts of phenolic epoxy resin, 5 parts of curing agent, 6 parts of ethylene glycol diglycidyl ether, 2.6 parts of diethylenetriaminepropyltrimethoxysilane, 2.2 parts of modified short-cut carbon fiber, 0.9 parts of aluminum tripolyphosphate, 0.12 parts of tourmaline, and 0.02 parts of phenol sulfonic acid.

[0037] The curing agent is 4,4'-diaminodiphenylmethane and benzyl alcohol in a weight ratio of 3.6:1. Tourmaline is tourmaline powder that has been calcined at high temperature and ground, and the particle size of the tourmaline powder is 5-20 μm.

[0038] A method for preparing a temperature- and pressure-resistant anti-corrosion coating for pipelines includes the following steps:

[0039] Step 1: Place 2.6 parts by weight of diethylenetriaminopropyltrimethoxysilane and 0.9 parts by weight of aluminum tripolyphosphate into a mixing vessel purged with nitrogen to a pressure of 1 atmosphere. Mix and stir at 60°C for 30 minutes, then cool to 5°C and filter to obtain the modified aluminum tripolyphosphate and diethylenetriaminopropyltrimethoxysilane residue.

[0040] Step 2: Place 50 parts by weight of phenolic epoxy resin in a reaction vessel under inert gas conditions, heat the reaction vessel to 60°C, and then gradually add the remaining liquid of diethylenetriaminepropyltrimethoxysilane to the reaction vessel while stirring. After the addition is completed, keep it at the temperature for 2 hours and then cool it to room temperature to obtain modified phenolic epoxy resin.

[0041] Step 3: Mix and stir 6 parts by weight of ethylene glycol diglycidyl ether, 0.12 parts by weight of tourmaline powder and modified phenolic epoxy resin to obtain mixed resin A.

[0042] Step 4: Add the modified aluminum tripolyphosphate from Step 1 and 2.2 parts by weight of modified short-cut carbon fiber into the mixed resin A. Mix and stir in a high-speed mixing pot to obtain mixed resin B. Control the stirring time to 5 minutes and the side crushing to 3 minutes.

[0043] Step 5: Add 5 parts by weight of curing agent and 0.02 parts by weight of phenol sulfonic acid to mixed resin B. The mixture of B obtained by mixing and stirring is extruded through a twin-screw extruder. The twin-screw extruder uses a 90° toothed screw in the homogenization section, and controls the temperature of the plasticizing section to 100° and the temperature of the homogenization section to 120°. The extruded melt is cooled by the cooling roller and then conveyed to the crushing roller for preliminary crushing to obtain sheet material. The sheet material is then ground and screened in an ACM mill to obtain the finished anti-corrosion coating.

[0044] Tourmaline has a specific surface area of ​​130-200 m². 2 / g. Therefore, by distributing tourmaline in the modified phenolic epoxy resin to improve the density of the waterproof layer, the corrosive chloride ions are effectively prevented from affecting the anti-corrosion performance of the coating. Meanwhile, the modified short-cut carbon fiber is obtained by mixing carbon fiber and 4-(triphenylphospho)butane-1-sulfonate at a mass ratio of 1:0.01, ultrasonically and at high temperature for 0.1 h, controlling the high temperature at 70℃, and then centrifuging.

[0045] Example 2

[0046] A temperature- and pressure-resistant anti-corrosion coating for pipelines comprises the following components in parts by weight: 55 parts of phenolic epoxy resin, 7 parts of curing agent, 7 parts of ethylene glycol diglycidyl ether, 2.9 parts of diethylenetriaminepropyltrimethoxysilane, 2.8 parts of modified short-cut carbon fiber, 1.1 parts of aluminum tripolyphosphate, 0.16 parts of tourmaline, 0.21 parts of phenol sulfonic acid, and 0.3 parts of additives.

[0047] The curing agent is m-phenylenediamine and benzyl alcohol in a weight ratio of 5.2:1. Tourmaline is tourmaline powder that has been calcined at high temperature and ground, and the particle size of the tourmaline powder is 5-20 μm. The additives are 0.15 parts by weight of defoamer and 0.15 parts by weight of dispersant. In the embodiments of this application, the defoamer is silicone oil defoamer HW-302, and the dispersant is dispersant BYK110.

[0048] A method for preparing a temperature- and pressure-resistant anti-corrosion coating for pipelines includes the following steps:

[0049] Step 1: Place 2.9 parts by weight of diethylenetriaminopropyltrimethoxysilane and 1.1 parts by weight of aluminum tripolyphosphate into a mixing vessel filled with nitrogen to a pressure of 3 atmospheres. Mix and stir at a high temperature of 61°C for 45 minutes, then cool to 6°C and filter to obtain the modified aluminum tripolyphosphate and diethylenetriaminopropyltrimethoxysilane residue.

[0050] Step 2: Place 55 parts by weight of phenolic epoxy resin in a reaction vessel under inert gas conditions, heat the reaction vessel to 64°C, and then gradually add the remaining liquid of diethylenetriaminepropyltrimethoxysilane to the reaction vessel while stirring. After the addition is completed, keep it at the temperature for 2 hours and then cool it to room temperature to obtain modified phenolic epoxy resin.

[0051] Step 3: Mix and stir 7 parts by weight of ethylene glycol diglycidyl ether, 0.16 parts by weight of tourmaline powder and modified phenolic epoxy resin to obtain mixed resin A.

[0052] Step 4: Add the modified aluminum tripolyphosphate from Step 1 and 2.8 parts by weight of modified short-cut carbon fiber into mixed resin A, and mix and stir in a high-speed mixing pot to obtain mixed resin B, controlling the stirring time to 5 minutes and the side crushing to 4 minutes.

[0053] Step 5: Add 7 parts by weight of curing agent, 0.21 parts by weight of phenol sulfonic acid, 0.15 parts by weight of defoamer and 0.15 parts by weight of dispersant to mixed resin B. The mixture of B obtained by mixing and stirring is extruded through a twin-screw extruder. The twin-screw extruder uses a 90° toothed screw in the homogenization section, and controls the temperature of the plasticizing section to 100° and the temperature of the homogenization section to 120°. The extruded melt is cooled by the cooling roller and then conveyed to the crushing roller for preliminary crushing to obtain sheet material. The sheet material is then ground and screened in an ACM mill to obtain the finished anti-corrosion coating.

[0054] Tourmaline has a specific surface area of ​​130-200 m². 2 / g. Therefore, by distributing tourmaline in the modified phenolic epoxy resin to improve the density of the waterproof layer, the corrosive chloride ions are effectively prevented from affecting the anti-corrosion performance of the coating. Meanwhile, the modified short-cut carbon fiber was obtained by mixing carbon fiber with 4-(triphenylphospho)butane-1-sulfonate and distilled water at a mass ratio of 1:0.1:50, ultrasonically and at high temperature for 1 hour, controlling the high temperature at 75℃, followed by centrifugation.

[0055] Example 3

[0056] A temperature- and pressure-resistant anti-corrosion coating for pipelines comprises the following components in parts by weight: 60 parts of phenolic epoxy resin, 10 parts of curing agent, 8 parts of ethylene glycol diglycidyl ether, 3.3 parts of diethylenetriaminepropyltrimethoxysilane, 3.5 parts of modified short-cut carbon fiber, 1.2 parts of aluminum tripolyphosphate, 0.25 parts of tourmaline, 0.35 parts of phenol sulfonic acid, and 0.6 parts of additives.

[0057] The curing agent is 4,4'-diaminodiphenylmethane and benzyl alcohol in a weight ratio of 8.2:1. Tourmaline is tourmaline powder that has been calcined at high temperature and ground, and the particle size of the tourmaline powder is 5-20 μm. The additives are 0.3 parts by weight of defoamer and 0.3 parts by weight of dispersant. In the embodiments of this application, the defoamer is silicone oil defoamer HW-302, and the dispersant is dispersant BYK110.

[0058] A method for preparing a temperature- and pressure-resistant anti-corrosion coating for pipelines includes the following steps:

[0059] Step 1: Place 3.3 parts by weight of diethylenetriaminepropyltrimethoxysilane and 1.2 parts by weight of aluminum tripolyphosphate into a mixing vessel filled with nitrogen to a pressure of 5 atmospheres. Mix and stir at 65°C for 60 minutes, then cool to 10°C and filter to obtain the modified aluminum tripolyphosphate and diethylenetriaminepropyltrimethoxysilane residue.

[0060] Step 2: Place 60 parts by weight of phenolic epoxy resin in a reaction vessel under inert gas conditions, heat the reaction vessel to 65°C, and then gradually add the remaining liquid of diethylenetriaminepropyltrimethoxysilane to the reaction vessel while stirring. After the addition is completed, keep it at the temperature for 2 hours and then cool it to room temperature to obtain modified phenolic epoxy resin.

[0061] Step 3: Mix and stir 8 parts by weight of ethylene glycol diglycidyl ether, 0.25 parts by weight of tourmaline powder and modified phenolic epoxy resin to obtain mixed resin A.

[0062] Step 4: Add the modified aluminum tripolyphosphate from Step 1 and 3.5 parts by weight of modified short-cut carbon fiber into mixed resin A. Mix and stir in a high-speed mixing pot to obtain mixed resin B. Control the stirring time to 5 minutes and the side crushing to be turned on for 5 minutes.

[0063] Step 5: Add 10 parts by weight of curing agent, 0.35 parts by weight of phenol sulfonic acid, 0.3 parts by weight of defoamer and 0.3 parts by weight of dispersant to mixed resin B. The mixture of B obtained by mixing and stirring is extruded through a twin-screw extruder. The twin-screw extruder uses a 90° toothed screw in the homogenization section, and controls the temperature of the plasticizing section to 100° and the temperature of the homogenization section to 120°. The extruded melt is cooled by the cooling roller and then conveyed to the crushing roller for preliminary crushing to obtain sheet material. The sheet material is then ground and screened in an ACM mill to obtain the finished anti-corrosion coating.

[0064] Tourmaline has a specific surface area of ​​130-200 m². 2 / g. Therefore, by distributing tourmaline in the modified phenolic epoxy resin to improve the density of the waterproof layer, the corrosive chloride ions are effectively prevented from affecting the anti-corrosion performance of the coating. Meanwhile, the modified short-cut carbon fiber was obtained by mixing carbon fiber with 4-(triphenylphospho)butane-1-sulfonate and distilled water at a mass ratio of 1:0.2:100, ultrasonically and at high temperature for 2 hours, controlling the high temperature at 80℃, followed by centrifugation.

[0065] Example 4

[0066] The difference between Example 4 and Example 2 is that the additives in Example 4 are 0.1 parts by weight of defoamer and 0.2 parts by weight of dispersant.

[0067] Comparative Example 1

[0068] The difference between Comparative Example 1 and Example 2 is that the preparation method of the temperature and pressure resistant anti-corrosion coating for pipelines in Comparative Example 2 did not include step one.

[0069] Comparative Example 2

[0070] The difference between Comparative Example 2 and Example 2 is that in Comparative Example 2, step 2 of the preparation method of the temperature and pressure resistant anti-corrosion coating for pipelines directly stirs and mixes the mixed solution of phenolic epoxy resin and the remaining liquid of diethylenetriaminepropyltrimethoxysilane.

[0071] Comparative Example 3

[0072] The difference between Comparative Example 3 and Example 2 is that tourmaline powder was not added in Comparative Example 3.

[0073] Comparative Example 4

[0074] The difference between Comparative Example 4 and Example 2 is that short-cut carbon fibers were used instead of modified short-cut carbon fibers in Comparative Example 4.

[0075] Comparative Example 5

[0076] The difference between Comparative Example 5 and Example 2 is that phenol sulfonic acid was not added in Comparative Example 5.

[0077] Performance testing:

[0078] 1. Corrosion resistance: The coating's resistance to acid, alkali and salt water is tested according to GB9274-1988 "Determination of resistance to liquid media for paints and varnishes".

[0079] 2. Adhesion: The adhesion of the coating film is tested according to GB / T9286-1998 "Cross-cut test of paint and varnish film".

[0080] 3. Impact resistance: The impact resistance of the coating is determined according to GB / T1732-93 "Test Method for Impact Resistance of Coating Film".

[0081] 4. Surface appearance: visual inspection.

[0082] Table 1 Performance Test Results

[0083]

[0084] As shown in Table 1, the anti-corrosion performance of Comparative Example 3 is significantly lower than that of Example 2, and the adhesion is also significantly reduced, thus affecting the anti-corrosion performance of the coating. The adhesion of Comparative Example 4 is significantly lower than that of Example 2, but the anti-corrosion effect is achieved through the synergistic combination of tourmaline powder, modified phenolic epoxy resin, and modified aluminum tripolyphosphate. Comparative Example 2 shows a certain reduction in adhesion compared to Example 2, but it still achieves a certain level of impact resistance and anti-corrosion performance. However, Comparative Example 1 shows a significant reduction in both adhesion and anti-corrosion performance compared to Example 2. This indicates that modified aluminum tripolyphosphate, through orderly dispersion in the modified phenolic epoxy resin, avoids agglomeration while achieving effective anti-corrosion. Furthermore, the cross-linking of active groups between modified aluminum tripolyphosphate and modified phenolic epoxy resin and other components forms an interwoven multidimensional network structure, significantly improving the coating's density, pressure resistance, anti-corrosion performance, and adhesion.

[0085] In summary, this application provides a temperature- and pressure-resistant anti-corrosion coating for pipelines and its preparation method. This coating is obtained by combining phenolic epoxy resin, ethylene glycol diglycidyl ether, diethylenetriaminepropyltrimethoxysilane, modified short-cut carbon fibers, aluminum tripolyphosphate, and tourmaline under the action of a curing agent and phenolsulfonic acid. This allows the adsorption capacity and porous properties of tourmaline to firmly bind the components together, and the pressure resistance of the coating is significantly enhanced by the adsorption of tourmaline through the combination of modified short-cut carbon fibers and tourmaline. Furthermore, the aluminum tripolyphosphate synergistically improves the anti-corrosion performance of the coating with tourmaline. The preparation method of this temperature- and pressure-resistant anti-corrosion coating for pipelines involves modifying phenolic epoxy resin to introduce the amino groups from diethylenetriaminepropyltrimethoxysilane into the resin, thereby improving the uneven distribution of aluminum tripolyphosphate. This ensures that the modified aluminum tripolyphosphate, obtained by modifying diethylenetriaminepropyltrimethoxysilane, is orderly dispersed in the modified phenolic epoxy resin, avoiding agglomeration. Simultaneously, modified short-cut carbon fibers, obtained by treating carbon fibers with 4-(triphenylphospho)butane-1-sulfonate, activate the carbon fibers, thereby increasing the bonding strength between the modified short-cut carbon fibers and the mixed resin A. The addition of tourmaline powder and modified short-cut carbon fibers forms a dense waterproof layer with the phenolic epoxy resin, thus improving the anti-corrosion performance. Phenolic sulfonic acid binds to the phenolic epoxy resin through hydroxyl groups, further enhancing the anti-corrosion ability of the coating. By forming chemical bonds through hydrogen bonding and dehydration condensation, the resin material and the substrate can be effectively bonded together, thereby improving the adhesion strength of the anti-corrosion coating and avoiding the problem of reduced anti-corrosion performance due to decreased adhesion strength.

[0086] The terms “first,” “second,” “third,” “fourth,” etc., used in this application (if applicable) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, or apparatus.

[0087] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0088] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for producing a temperature and pressure resistant anticorrosive coating for pipes, for producing a temperature and pressure resistant anticorrosive coating for pipes, characterized by, The pipeline uses temperature-resistant and pressure-resistant anticorrosive paint, which comprises the following components by weight: 50-60 parts of phenolic epoxy resin, 5-10 parts of curing agent, 6-8 parts of ethylene glycol diglycidyl ether, 2.6-3.3 parts of diethylenetriamine propyl trimethoxysilane, 2.2-3.5 parts of modified short carbon fiber, 0.9-1.2 parts of aluminum tripolyphosphate, 0.12-0.25 parts of tourmaline, and 0.02-0.35 parts of phenol sulfonic acid. Step 1, put 2.6-3.3 parts by weight of diethylenetriamine propyl trimethoxysilane and 0.9-1.2 parts of aluminum tripolyphosphate into a mixing kettle filled with nitrogen to 1-5 atm, mix and stir at 60-65℃ for 30-60min, then cool to 5-10℃ and filter to obtain modified aluminum tripolyphosphate and diethylenetriamine propyl trimethoxysilane residue; Step 2, mix and react 50-60 parts by weight of phenolic epoxy resin with the diethylenetriamine propyl trimethoxysilane residue to obtain modified phenolic epoxy resin; Step 3, mix and stir 6-8 parts by weight of ethylene glycol diglycidyl ether, 0.12-0.25 parts of tourmaline, and modified phenolic epoxy resin to obtain mixed resin A material; Step 4, put the modified aluminum tripolyphosphate in step 1 and 2.2-3.5 parts by weight of modified short carbon fiber into the mixed resin A material, mix and stir to obtain mixed resin B material; Step 5, put 5-10 parts by weight of curing agent, 0.02-0.35 parts of phenol sulfonic acid, 0-0.3 parts of defoaming agent, and 0-0.3 parts of dispersing agent into the mixed resin B material, mix and stir to obtain B material mixture.

2. The preparation method of the temperature-resistant and pressure-resistant anticorrosive coating for pipes according to claim 1, characterized in that: The curing agent is aromatic amine and benzyl alcohol in a weight ratio of 3.6-8.2:

1.

3. The preparation method of the temperature-resistant and pressure-resistant anticorrosive coating for pipes according to claim 2, characterized in that: The aromatic amine is 4,4'-diaminodiphenylmethane or m-phenylenediamine.

4. The preparation method of the temperature-resistant and pressure-resistant anticorrosive coating for pipes according to claim 1, characterized in that: The tourmaline is tourmaline powder treated by high temperature calcination and grinding, and the particle size of the tourmaline powder is 5-20μm.

5. The method for preparing a temperature and pressure resistant anticorrosive coating for pipes according to claim 1, characterized in that: The defoaming agent is silicone defoaming agent HW-302; the dispersing agent is dispersing agent BYK110.

6. The preparation method of the temperature-resistant and pressure-resistant anticorrosive coating for pipes according to claim 1, characterized in that: In step 2, the phenolic epoxy resin is heated to 60-65℃ under inert gas conditions, then the diethylenetriamine propyl trimethoxysilane residue is added gradually, stirring is maintained during the addition, after the addition is completed, the modified phenolic epoxy resin is obtained after 2h of incubation and cooling to room temperature.

7. The method for preparing a temperature and pressure resistant anticorrosive coating for pipes according to claim 1, characterized in that: The specific surface area of the tourmaline is 130-200 m 2 / g.

8. The method for preparing a temperature and pressure resistant anticorrosive coating for pipes according to claim 1, characterized in that: In step 4, the modified short carbon fiber is obtained by mixing carbon fiber with 4-(triphenylphosphonium) butane-1-sulfonate and distilled water in a mass ratio of 1:0.01-0.2:0-100, ultrasonic treatment and high temperature stirring for 0.1-2h, controlling the high temperature to 70-80℃, and then centrifuging.

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