Fluorine modified asphalt anticorrosive paint and preparation method thereof

Abstract

The invention discloses a fluorine modified asphalt anticorrosive paint and a preparation method thereof, and relates to the technical field of metal anticorrosive coatings, the paint comprises the following components by weight: 10%-25% of a fluorine material, 0.5%-3% of an emulsifier, 50%-70% of modified asphalt, 0.5%-3% of a stabilizer, 0.1%-2% of a pH value regulator, 0.1%-2% of a leveling agent and 0.1%-2% of a dispersant; the fluorine material is one or more of calcium fluoride, magnesium fluoride, sodium fluosilicate and fluorine-modified epoxy resin, and when the fluorine material is more than the calcium fluoride, the magnesium fluoride, the sodium fluosilicate and the fluorine-modified epoxy resin, the weight ratio of the components is 1: 1; according to the invention, the fluorine material and the modified asphalt are selected as the core and are matched with the adaptive assistant to realize synergistic interaction, so that the corrosion resistance, weather resistance and aging resistance of the coating are remarkably improved, and efficient production and stable quality of the coating are ensured by optimizing the preparation process, such as key links of pre-dispersion, precise temperature-control emulsification, strict mixing, additive compounding and the like; the final product is high in purity and good in homogeneity, and various anticorrosion requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal anticorrosive coating, in particular to a fluorine-modified asphalt anticorrosive coating and a preparation method thereof. BACKGROUND

[0002] In the field of industrial production, infrastructure construction and various engineering, metal components and concrete structures are easily corroded when exposed to natural environment or chemical medium for a long time. Such corrosion not only damages the integrity of the structure and reduces its carrying capacity and safety performance, but also may cause equipment failure, engineering shutdown, and huge economic losses and resource waste. Therefore, developing high-performance anticorrosive materials has become a key requirement for the development of the industry. Asphalt-based anticorrosive coatings have long occupied an important position in the field of corrosion protection due to their natural water resistance, good adhesion and high economy, and are widely used in the protection of structures such as pipelines, storage tanks and bridges. However, as the application scenarios continue to expand, the performance of coatings is required to be higher under complex working conditions. The limitations of ordinary asphalt coatings in weather resistance, aging resistance and chemical corrosion resistance have gradually become apparent. The industry has begun to optimize the performance of asphalt by introducing modifiers. Fluorine materials have become an important research direction for improving the comprehensive performance of asphalt coatings due to their excellent chemical stability, impermeability and weather resistance, providing a technical idea for the development of higher-performance anticorrosive coatings.

[0003] Traditional asphalt anticorrosive coatings still have many performance shortcomings that are difficult to meet actual needs even after simple modification. Ordinary modified asphalt coatings are easily affected by ultraviolet radiation, temperature alternation and humidity during long-term outdoor use, and problems such as coating aging, cracking and peeling may occur, resulting in failure of the anticorrosive protective layer and inability to provide long-term and continuous protection for the substrate, thereby shortening the service life of the structure. In some modification schemes, the compatibility of the modifier and the asphalt matrix is poor, and uneven dispersion may occur, which not only fails to fully utilize the performance advantages of the modifier, but also may damage the stability of the coating system, causing the coating to separate and precipitate during storage, affecting subsequent use. In addition, the construction adaptability of traditional coatings is weak, and some products have poor leveling properties, which may easily form surface defects after construction, reducing the anticorrosive effect. At the same time, some coatings have strict requirements for the construction environment, and it is difficult to ensure the film formation quality in high-temperature, high-humidity or low-temperature environments, further limiting their application range under complex working conditions. SUMMARY

[0004] The present application aims to make up for the shortcomings of the prior art and provides a fluorine-modified asphalt anticorrosive coating and a preparation method thereof. The coating comprises fluorine materials, modified asphalt, emulsifiers, stabilizers, pH value regulators, leveling agents and dispersants. During preparation, the fluorine materials are first pre-dispersed with the dispersant, then the modified asphalt is mixed with the emulsifiers to form modified emulsified asphalt, and other additives are then added. After maturation and filtration, a uniform coating is obtained.

[0005] To solve the above technical problems, the present application provides the following technical solutions: on the one hand, a fluorine modified asphalt anticorrosive coating, the coating comprises the following components by weight percentage: fluorine material 10%-25%, emulsifier 0.5%-3%, modified asphalt 50%-70%, stabilizer 0.5%-3%, pH value regulator 0.1%-2%, leveling agent 0.1%-2%, dispersant 0.1%-2% and deionized water; The fluorine material is one or more of calcium fluoride, magnesium fluoride, sodium fluorosilicate and fluorine modified epoxy resin, and when there are multiple components, the weight ratio between the components is 1:1.

[0006] Further, the emulsifier is one or more of alkyl amine, amide or quaternary amine salt, and when there are multiple components, the weight ratio between the components is 1:1; The alkyl amine is one or both of alkyl propylene diamine and alkyl propylene triamine; The amide is one or both of N-aminoethyl amide and alkyl amide polyamine; The quaternary amine salt is one or more of hexadecanetetradecyl trimethyl ammonium chloride, tetradecyl octadecyl dimethyl hydroxyethyl ammonium chloride and hexadecyl trimethyl ammonium bromide.

[0007] Further, the modified asphalt is one or more of SBS modified asphalt, SBR modified asphalt and UPVC modified asphalt, and when there are multiple components, the weight ratio between the components is 1:1.

[0008] Further, the stabilizer is organic high molecular material or inorganic salt, wherein the organic high molecular material is one or more of methyl cellulose, gelatin, starch, polyacrylamide, sodium carboxymethyl cellulose and hydroxypropyl cellulose, and when there are multiple components, the weight ratio between the components is 1:1; the inorganic salt is potassium chloride.

[0009] Further, the pH value regulator is one or more of hydrochloric acid, nitric acid, phosphoric acid, formic acid, acetic acid, acrylic acid, succinic acid and adipic acid, and when there are multiple components, the weight ratio between the components is 1:1.

[0010] On the other hand, a preparation method of fluorine modified asphalt anticorrosive coating, the specific steps of the method are as follows: S100, pre-dispersion treatment: add fluorine material and dispersant into a high-speed shearing machine, disperse at a speed of 2000r / min for 10 minutes until the material is not aggregated; S200, modified emulsified asphalt preparation: heat the modified asphalt to 170-210℃, prepare a soap solution with emulsifier and water and heat to 55-65℃, prepare modified emulsified asphalt by high-speed colloid mill with the modified asphalt and the soap solution at a mass ratio of 1:1.2-1:1.5; S300, paint mixing: slowly add the obtained pre-dispersed fluoride slurry to the modified emulsified asphalt, and stir for 30 minutes; S400, additive compounding: after the paint is uniformly dispersed, add stabilizer and leveling agent, and stir at a speed of 500 r / min for 15 minutes; S500, aging and filtering: let the above mixture stand for 24 hours, and filter to obtain uniform fluorine modified asphalt anticorrosive coating slurry.

[0011] Further, in the S100, pre-dispersing treatment, the fluorine material is first placed in a vacuum drying box, dried at 80±5℃ and a vacuum degree of-0.08MPa for 2-3 hours until the water content is ≤0.5%, and then sieved through an 80-mesh standard sieve; when the dispersant is a solid powder, prepare a dispersant aqueous solution by mixing deionized water at a mass ratio of 1:5, and stir at 600r / min for 10 minutes until completely dissolved.

[0012] Further, in the S200, modified emulsified asphalt preparation, the melting temperature of the modified asphalt is adjusted according to the type: 180-200℃ for SBS modified asphalt, 170-190℃ for SBR modified asphalt, and 200-210℃ for UPVC modified asphalt; the gap between the grinding discs of the high-speed colloid mill is adjusted to 0.05-0.1mm, and the outlet temperature of the high-speed colloid mill is controlled at 60-70℃.

[0013] Further, in the S300, paint mixing, the temperature of the pre-dispersed fluoride slurry and the modified emulsified asphalt is controlled at 60-65℃, and the temperature difference is ≤5℃; the pre-dispersed fluoride slurry is pumped into the modified emulsified asphalt at a speed of 5-10L / h by a peristaltic pump, and the feeding port is located at the center of the vortex formed by the stirring of the modified emulsified asphalt.

[0014] Further, in the S500, aging and filtering, the ambient temperature for the aging of the mixture is 25±2℃, and the relative humidity is 50±5%; the filtering uses three layers of filter screens in series, the first layer is an 80-mesh stainless steel filter screen, the second layer is a 200-mesh stainless steel filter screen, and the third layer is a 500-mesh nylon filter screen, and the filtering speed is controlled at 10-15L / min.

[0015] Compared with the prior art, the fluorine modified asphalt anticorrosive coating and the preparation method thereof have the following beneficial effects: I. The present application selects fluorine material and modified asphalt as core components, and matches suitable emulsifiers, stabilizers, pH regulators, leveling agents and dispersants to construct a synergistic coating system among components. The characteristics of fluorine material and the basic performance of modified asphalt are deeply integrated to effectively strengthen the corrosion resistance of the coating, improve the weather resistance and anti-aging property, and prolong the service life of the application object. The reasonable selection of emulsifiers optimizes the emulsification effect of the coating, making the system more easily dispersed and not easy to delaminate. The addition of stabilizers enhances the stability of the coating during storage and use, avoiding performance decay or deterioration. The pH regulator and leveling agent cooperate to improve the construction fluidity and film forming effect of the coating, ensuring uniform and dense coating to reduce defects. The dispersant helps the uniform distribution of fluorine material in the system, fully plays its role, and makes the coating exhibit stable and reliable application performance on different environments and substrates, widening the application scenarios.

[0016] II. The present application optimizes the key links of the preparation process to build a process system considering efficient production and stable quality. The pre-dispersion treatment link lays a foundation for the subsequent integration of fluorine material into the system, avoiding the influence of agglomeration on overall performance. In the preparation process of modified emulsified asphalt, the control of the treatment method of the core raw material ensures the emulsification effect while fully retaining the excellent properties of the core component. The control of the material state and feeding method during the coating mixing stage promotes the full contact and reaction of each material, improving the uniformity of the system. The control of the stirring conditions during the additive compounding allows the stabilizers, leveling agents and other additives to fully play their roles to further optimize the coating performance. The curing and filtering link removes impurities and undispersed particles in the system through environmental regulation and multi-layer filtering design to ensure the purity and homogeneity of the final product. The whole process is closely linked, which not only improves the production efficiency, but also ensures the consistency of the performance of each batch of products, making the coating have good construction convenience and use reliability in actual application, meeting various corrosion prevention needs.

[0017] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification and drawings, and will be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0019] Figure 1 Flow chart for the preparation method of fluorine modified asphalt anticorrosive coating. DETAILED DESCRIPTION

[0020] To further clarify the technical means and effects taken by the present application to achieve the predetermined inventive purpose, the specific embodiments, structures, features and effects thereof according to the present application are described in detail below in conjunction with the drawings and preferred embodiments.

[0021] Example One: This embodiment is suitable for the corrosion protection of the inner and outer walls of municipal underground pipelines, and is suitable for working conditions such as underground humid environment, soil electrochemical corrosion and microbial erosion, etc., as shown in Figure 1 Raw material preparation (by weight percentage): Fluorine material: 20% (calcium fluoride and sodium fluorosilicate mixed in a weight ratio of 1:1); Emulsifier: 1.5% (hexadecyl trimethyl ammonium bromide); Modified asphalt: 65% (SBS modified asphalt); Stabilizer: 1% (sodium carboxymethyl cellulose); pH value regulator: 0.8% (acetic acid); Leveling agent: 0.7%; Dispersant: 1% (solid powder type); Deionized water: prepare soap solution and dispersant aqueous solution as needed; Preparation steps: S100, pre-dispersion treatment: place the mixed calcium fluoride and sodium fluorosilicate in a vacuum drying oven, dry at 80°C and a vacuum degree of -0.08 MPa for 2.5 hours, ensure that the moisture content of the material is reduced to below 0.5%, and sieve the dried material through an 80-mesh standard sieve to remove possible agglomerated particles and ensure uniform dispersion. Mix the solid dispersant with deionized water in a mass ratio of 1:1, stir at a speed of 600 r / min for 10 minutes until completely dissolved, form a uniform dispersant aqueous solution, and improve the combination efficiency of the dispersant and the fluorine material. Add the sieved and dried fluorine material and the prepared dispersant aqueous solution into a high-speed shearing machine, continuously disperse at a speed of 2000 r / min for 10 minutes until there is no agglomeration of the material, fully refine the fluorine material particles, lay a foundation for subsequent fusion with the asphalt system, ensure that the fluorine element is evenly distributed in the coating, and strengthen the corrosion protection performance.

[0022] ​S200, modified emulsified asphalt preparation: the SBS modified asphalt is put into a heating kettle, heated to 190°C to completely melt it, and the temperature matches the characteristics of the SBS modified asphalt, which can ensure the fluidity of the asphalt and not damage its modified structure. Mix cetyltrimethylammonium bromide with deionized water to make a soap solution, heat to 60°C, and fully activate the emulsifier to improve the emulsification effect on the asphalt. The molten SBS modified asphalt and the 60°C soap solution are simultaneously fed into a high-speed colloid mill at a mass ratio of 1:1.3. The gap between the mill discs is adjusted to 0.08mm, and the outlet temperature is controlled at 65°C. Through high-speed shearing and grinding, the asphalt is dispersed into fine particles and uniformly coated in the soap solution to form a stable modified emulsified asphalt. The emulsion system can enhance the adhesion of the coating to the pipe substrate and resist the penetration of underground moisture.

[0023] S300, coating mixing: the fluorinated slurry obtained by pre-dispersion treatment and the prepared modified emulsified asphalt are respectively constant temperature to 62°C, and the temperature difference between the two is controlled within 5°C to avoid agglomeration of the slurry or demulsification of the emulsified asphalt caused by temperature difference. The fluorinated slurry is pumped into the modified emulsified asphalt at a speed of 8L / h by peristaltic pump, and the feeding port is aligned with the vortex center formed by the stirring of the modified emulsified asphalt, so that the fluorinated slurry is quickly integrated into the system. Subsequently, continuous stirring for 30 minutes allows the corrosion resistance of the fluorinated material to fully combine with the waterproofness of the asphalt to form a synergistic protective effect, ensuring that the coating can effectively block corrosive media in complex underground environments.

[0024] S400, additive compounding: after the fluorinated slurry and the modified emulsified asphalt are uniformly mixed, carboxymethyl cellulose sodium and a leveling agent are slowly added to the system, and the stirring speed is maintained at 500r / min for 15 minutes to uniformly disperse the stabilizer in the coating, maintain the stability of the system during storage and construction, and avoid stratification or precipitation; the leveling agent can optimize the construction rheology of the coating, ensure smooth spreading of the coating on the pipe surface, reduce brush marks or bubble residues, and make the final coating structure more uniform.

[0025] S500, aging and filtration: the above mixture is transferred to a constant temperature and humidity aging chamber, and left to stand in an environment of 25°C and 50% relative humidity for 24 hours to allow the components to fully react and fuse, further improving the stability and comprehensive performance of the coating. After aging, the material is filtered through three layers of filter screens in series. The first layer is an 80-mesh stainless steel filter screen to remove large particle impurities; the second layer is a 200-mesh stainless steel filter screen to trap medium-sized undispersed particles; and the third layer is a 500-mesh nylon filter screen to filter fine impurities and flocculation. The filtration speed is controlled at 12L / min, and a uniform and fine fluorine-modified asphalt anticorrosive coating slurry is finally obtained. The slurry can form a continuous and dense protective layer on the surface of the pipe after construction, effectively resisting the erosion of underground soil, moisture and microorganisms.

[0026] In summary, the embodiment is directed to the municipal underground pipeline corrosion prevention scene, the component and ratio of fluorine modified asphalt anticorrosive coating used strictly follow the patent limitations. In preparation, the fluorine material is pre-dispersed with dispersant to ensure uniformity after drying and sieving, SBS modified asphalt is melted at a specific temperature and emulsified with soap solution to form a stable system, and then mixed with temperature control difference, and then compounded with stabilizer and leveling agent. Finally, uniform slurry is obtained through constant temperature and humidity curing, multi-layer filtration. The slurry can form a dense protective layer after construction, effectively resisting underground humidity, soil electrochemistry and microbial corrosion, and adapting to pipeline corrosion working conditions.

[0027] Example two: Stability detection example of fluorine modified asphalt anticorrosive coating

[0028] This embodiment is based on fluorine modified asphalt anticorrosive coating for municipal underground pipeline corrosion (components and preparation process are exactly the same as example one). By detecting the key performance indicators under different storage times, the stability of the coating is verified. The detection environment is standard condition of 25℃ and relative humidity of 50%, and the specific detection process and results are as follows: Detection index and method: Appearance state: directly observe whether the coating is layered, precipitated, caked, and record whether it maintains uniform and delicate slurry form.

[0029] Viscosity: using rotary viscometer, the viscosity of the coating is measured at 25℃, unit mPa・s.

[0030] Adhesion: using grid method, the coating is brushed on the standard steel plate and cured, the grid spacing is 1mm, and the coating falling off at the edge of the grid is observed. No falling off is qualified.

[0031] Corrosion resistance: the standard test piece coated with the coating is immersed in 5% sodium chloride solution, and whether rust and bubbling appear on the surface of the test piece is observed, and the time without abnormality is recorded.

[0032] Comparison table of stability detection at different times:

[0033] Stability detection summary: The present embodiment is aimed at fluorine modified asphalt anticorrosive coating for long-term stability tracking detection for 180 days. The detection process strictly maintains the raw material ratio, preparation process and initial embodiment consistent, only through the performance comparison of different storage time to verify the stability. From the test results, the coating shows excellent stability in the early stage of storage (0-90 days), the appearance always maintains uniform or slightly delaminated state which can quickly recover, the viscosity has a small increase but the change is controlled within 7%, the adhesion does not appear any decay, and the corrosion resistance also maintains at a high level of 720h without any abnormality. Even if stored for 180 days, the coating appears moderate delamination, but it can be restored to a uniform state after simple stirring, the viscosity increases by 11.8%, which is still within the reasonable use range, the adhesion only appears slight peeling on the local edge, the corrosion resistance is shortened to 696h without any abnormality, and the core protection function is not significantly affected.

[0034] This result fully shows that the fluorine modified asphalt anticorrosive coating of the present application forms a stable system structure through scientific component matching and rigorous preparation process. The pre-dispersion treatment makes the fluorine material uniformly dispersed, the stable system of modified emulsified asphalt lays the foundation for the coating, and the reasonable addition of stabilizer further inhibits component separation, so that the coating can still maintain good use performance during long-term storage. The performance decay rate of the coating within 180 days is small, and part of the slight defects can be recovered by simple treatment, which fully meets the actual needs of the storage period of the coating in municipal engineering and other scenes, and provides reliable stability support for its large-scale application.

[0035] Example three: Performance test example of fluorine modified asphalt anticorrosive coating: In this embodiment, the fluorine modified asphalt anticorrosive coating for municipal underground pipeline corrosion protection is taken as the test object: containing 20% fluorine calcium-sodium fluorosilicate (1:1) mixed fluorine material, 1.5% cetyltrimethylammonium bromide, 65% SBS modified asphalt, 1% carboxymethyl cellulose sodium, 0.8% acetic acid, 0.7% leveling agent, 1% dispersant, prepared by pre-dispersion, modified emulsified asphalt preparation, mixing, additive compounding and aging filtration. The test sample is a Q235 steel plate (150mm×75mm×3mm, coating thickness 0.5mm, 25℃, 50% relative humidity for 7 days), and the test environment is uniformly 25℃, relative humidity 50%. The specific test process, results and judgment are as follows: 1. Adhesion test: Test process: Draw a grid on the sample surface with a grating tool at an interval of 1mm to form 100 1mm×1mm squares, and draw through the coating to the substrate; After cleaning the debris with a soft brush, paste 3M610 pressure-sensitive tape and press it, tear it off at 180° after 1 minute; Observe the extent of edge detachment of the squares and the adhesion of the tape.

[0036] Test results: No complete squares in the grid area have fallen off; only two squares at the corners show slight lifting (not a complete peel-off). There are no coating debris on the tape surface. According to the standard, if the number of peeling squares is ≤3, the adhesion is qualified and the corresponding adhesion level is 1 (the highest level is 0, and level 1 indicates slight peeling at the edge, which meets the adhesion requirements for underground pipeline corrosion protection).

[0037] 2. Salt spray corrosion test: Testing process: The sample and blank Q235 steel plate were placed in a salt spray chamber, and salt spray was generated using 5% sodium chloride solution. The sedimentation rate was controlled at 1.5 mL / (80 cm·h), the temperature was 35℃, and the spraying was carried out continuously for 720 h. 2 Samples were taken out at 100h, 200h, 300h, 500h and 720h respectively, rinsed with deionized water and observed for surface condition.

[0038] Test results: 100-500h: The sample surface is free of rust, blistering, and cracking, with only slight white salt frost adhering to it, which can be wiped away to restore its original appearance; 720h: Small bubbles with a diameter of <1mm appeared locally on the edge of the sample (number ≤3, percentage <0.1%), without rust or peeling, while the blank steel plate was completely rusted after 720h; According to the standard, the corrosion resistance is qualified after 720 hours, and it can resist the long-term erosion of corrosive media such as chloride ions in underground soil.

[0039] 3. Water resistance test.

[0040] Testing process: The samples were completely immersed in deionized water at 25°C and removed after 7, 14, 30 and 60 days, respectively. Observe the appearance of the coating, weigh it to calculate the rate of change of mass (rate of change of mass = (mass after immersion - mass before immersion) / mass before immersion × 100%), and retest the adhesion.

[0041] Test results: Appearance: The coating will not whiten, wrinkle, or peel within 7-60 days, and the surface gloss will remain basically consistent; Quality change rate: +0.32% for 7 days, +0.45% for 14 days, +0.51% for 30 days, and +0.55% for 60 days, all ≤±1%; Adhesion retest: After 60 days, the cross-cut test still showed a grade of 1, with no adhesion degradation; According to the standard: water resistance is qualified, can withstand underground humid environment for a long time without failure.

[0042] 4. High temperature resistance test: Test process: Put the sample into the constant temperature oven, heat to 80℃ (the extreme temperature of underground pipeline in summer is about 75℃, with a safety margin), constant temperature for 72h; Observe the appearance every 12h during the period, after the end, naturally cool to room temperature, retest adhesion and appearance integrity.

[0043] Test results: During high temperature: no softening, flowing, discoloration of the coating, no bubbles or cracking on the surface; After cooling: the appearance is consistent with before the test, the adhesion retest is still 1 level, no coating peeling; According to the standard: high temperature resistance is qualified, can adapt to the high temperature environment around the underground pipeline in summer.

[0044] 5. Low temperature resistance test.

[0045] Test process: Put the sample into the low temperature test box, cool to -20℃ (the low temperature of soil in northern winter is about -15℃, with a safety margin), constant temperature for 72h; Observe the appearance every 12h during the period, after the end, take out and restore for 2h, conduct 180° bending test (bending shaft diameter 10mm), observe the coating state.

[0046] Test results: During low temperature: no brittle cracking, peeling of the coating, no obvious shrinkage deformation on the surface; Bending test: after the sample is bent 180°, the coating has no cracking or peeling, only very fine scratches appear at the bending part (without affecting the protection performance); According to the standard: low temperature resistance is qualified, can maintain structural stability in underground environment in northern cold regions.

[0047] 6. Abrasion resistance test: Test process: Use Taber abrasion tester, H-18 grinding wheel, 1kg load, 60r / min speed, total number of revolutions 1000; Before testing, weigh the sample mass (accurate to 0.001g), after testing, weigh again, calculate the mass wear, observe whether the surface is exposed.

[0048] Test results: Mass wear: before testing, the mass is 28.563g, after testing, the mass is 28.521g, the wear is 0.042g (≤0.05g); Surface state: after abrasion, only slight foggy marks appeared on the coating surface, no substrate was exposed, and the coating thickness remained more than 0.45 mm; Standard judgment: abrasion resistance qualified, can resist friction damage during pipeline transportation and laying.

[0049] 7. Test summary: This test covers the core performance requirements of fluorine-modified asphalt anticorrosive coating in underground pipeline applications, including adhesion, corrosion resistance, water resistance, high temperature resistance, low temperature resistance, and abrasion resistance, all of which meet industry standards and engineering application requirements. Among them, only a small amount of bubbling appeared after 720h salt spray testing, the 60-day water resistance mass change rate was <0.6%, and the 1000rpm abrasion loss was <0.05g, fully demonstrating the stable protection capability of the coating; the adhesion did not decrease after high and low temperature testing, indicating that it can adapt to different underground environments in different climate regions. The overall test results verify that the fluorine-modified asphalt anticorrosive coating can provide long-term and reliable corrosion protection for municipal underground pipelines, meeting the practical application requirements of engineering. The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications made according to the technical essence of the present application to the above embodiments are still within the scope of the technical solution of the present application.

Claims

1. A fluorine-modified asphalt anticorrosive coating characterized by, The coating comprises the following components in percentage by weight: 10%-25% of fluorine material, 0.5%-3% of emulsifier, 50%-70% of modified asphalt, 0.5%-3% of stabilizer, 0.1%-2% of pH value regulator, 0.1%-2% of leveling agent, 0.1%-2% of dispersant and deionized water. The fluorine material is one or more of calcium fluoride, magnesium fluoride, sodium fluorosilicate and fluorine-modified epoxy resin, and when there are multiple components, the weight ratio between the components is 1:

1.

2. The fluorine-modified asphalt anticorrosive coating according to claim 1, characterized in that, The emulsifier is one or more of alkyl amine, amide or quaternary ammonium salt, and when there are multiple components, the weight ratio between the components is 1:

1. The alkyl amine is one or both of alkyl propylene diamine and alkyl propylene triamine. The amide is one or both of N-aminoethyl amide and alkyl amide polyamine. The quaternary ammonium salt is one or more of hexadecanetridecanyl trimethyl ammonium chloride, tetradecanetridecyl dimethyl hydroxyethyl ammonium chloride and hexadecyl trimethyl ammonium bromide.

3. The fluorine-modified asphalt anticorrosive coating according to claim 1, characterized in that, The modified asphalt is one or more of SBS modified asphalt, SBR modified asphalt and UPVC modified asphalt, and when there are multiple components, the weight ratio between the components is 1:

1.

4. The fluorine-modified asphalt anticorrosive coating according to claim 1, characterized in that, The stabilizer is organic high molecular material or inorganic salt, wherein the organic high molecular material is one or more of methyl cellulose, gelatin, starch, polyacrylamide, sodium carboxymethyl cellulose and hydroxypropyl cellulose, and when there are multiple components, the weight ratio between the components is 1:1; and the inorganic salt is potassium chloride.

5. The fluorine-modified asphalt anticorrosive coating material according to claim 1, characterized in that, The pH value regulator is one or more of hydrochloric acid, nitric acid, phosphoric acid, formic acid, acetic acid, acrylic acid, succinic acid and adipic acid, and when there are multiple components, the weight ratio between the components is 1:

1.

6. A process for the preparation of a fluoro-modified bituminous anticorrosive coating, which process is used for the preparation of a fluoro-modified bituminous anticorrosive coating according to any one of claims 1 to 5, characterized in that, The specific steps of the method are as follows: S100, pre-dispersion treatment: the fluorine material and the dispersant are added into a high-speed shearing machine, and are dispersed at a speed of 2000 r / min for 10 minutes until the material is not aggregated; S200, preparation of modified emulsified asphalt: the modified asphalt is heated to 170-210 DEG C, the emulsifier and water are mixed into a soap solution and heated to 55-65 DEG C, and the modified asphalt and the soap solution are mixed into modified emulsified asphalt by a high-speed colloid mill at a mass ratio of 1:1.2-1:1.5; S300, coating mixing: the obtained pre-dispersed fluoride slurry is slowly added into the modified emulsified asphalt, and stirred for 30 minutes; S400, additive compounding: after the coating is uniformly dispersed, the stabilizer and the leveling agent are added, and stirred at a speed of 500 r / min for 15 minutes; S500, aging and filtering: the above mixture is left to stand for 24 hours, and then filtered to obtain uniform fluorine-modified asphalt anticorrosive coating slurry.

7. The method for preparing a fluorine-modified asphalt anticorrosive coating according to claim 6, characterized in that, In the S100, pre-dispersion treatment, the fluorine material is first placed in a vacuum drying box, dried at 80±5 DEG C and a vacuum degree of-0.08 MPa for 2-3 hours until the water content is less than or equal to 0.5%, and then sieved through a 80-mesh standard sieve; when the dispersant is a solid powder, it is mixed with deionized water at a mass ratio of 1:5 to prepare a dispersant aqueous solution, and stirred at 600 r / min for 10 minutes until completely dissolved.

8. The method for preparing a fluorine-modified asphalt anticorrosive coating according to claim 6, characterized in that, The S200, in the preparation of modified emulsified asphalt, the melting temperature of the modified asphalt is adjusted according to the type: the SBS modified asphalt is 180-200 DEG C, the SBR modified asphalt is 170-190 DEG C, and the UPVC modified asphalt is 200-210 DEG C; the gap between the grinding discs of the high-speed colloid mill is adjusted to 0.05-0.1 mm, and the outlet temperature of the high-speed colloid mill is controlled at 60-70 DEG C.

9. The method for preparing a fluorine-modified asphalt anticorrosive coating according to claim 6, characterized in that, The S300, in the mixing of the coating, the temperature of the pre-dispersed fluoride slurry and the modified emulsified asphalt is controlled at 60-65 DEG C, and the temperature difference is less than or equal to 5 DEG C; the pre-dispersed fluoride slurry is pumped into the modified emulsified asphalt at a speed of 5-10 L / h by a peristaltic pump, and the feeding port is located at the center of the vortex formed by the stirring of the modified emulsified asphalt.

10. The method for preparing a fluorine-modified asphalt anticorrosive coating according to claim 6, characterized in that, The S500, in the curing and filtering, the ambient temperature for the static curing of the mixed material is 25+ / -2 DEG C, and the relative humidity is 50+ / -5%; three layers of filter screens are used in series for the filtering, the first layer is a 80-mesh stainless steel filter screen, the second layer is a 200-mesh stainless steel filter screen, and the third layer is a 500-mesh nylon filter screen, and the filtering speed is controlled at 10-15 L / min.

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