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CN-121975386-A - Self-repairing nano paint for high-speed rail sound screen wall and preparation method thereof

CN121975386ACN 121975386 ACN121975386 ACN 121975386ACN-121975386-A

Abstract

The invention discloses a self-repairing nano coating for a high-speed rail sound screen wall and a preparation method thereof, which belong to the technical field of coatings, wherein gel microspheres are formed on the surface of porous shell powder through calcium ion crosslinking in sodium alginate and calcium chloride, a self-repairing agent is wrapped in the gel microspheres, barium nitride is hydrated to form barium hydroxide under the action of water excitation, the barium hydroxide belongs to an alkaline compound, and the corrosion effect on a modified binder in a system can be reduced through the wrapping action of microcapsules, so that the modified binder has light weight and sound insulation and good acid and alkali resistance, washing resistance and compressive strength, the polyvinyl alcohol is taken as a bridge, the hydroxyl group of the polyvinyl alcohol is combined with the carboxyl group of carboxymethyl chitosan and then copolymerized with vinyl acetate, so that the cohesive force and adhesive force to a base material of the binder are greatly improved, and the alkaline effect of the barium hydroxide is separated out, and meanwhile, the modified binder can be used as the crosslinking strength of the modified binder, and the adhesive strength is further improved.

Inventors

  • LIU XIN
  • XU YUZHONG
  • QIAN MING
  • LIU JINGLONG
  • MU QINGYU
  • Xi Kaixin

Assignees

  • 胜利油田德利实业有限责任公司

Dates

Publication Date
20260505
Application Date
20260302

Claims (10)

  1. 1. The preparation method of the self-repairing nano coating for the high-speed rail sound screen wall is characterized by comprising the following steps of: Step one, taking polystyrene nano-microspheres as a sacrificial template, carrying out acid etching on shell powder by hydrochloric acid, and taking the shell powder as a catalyst to catalyze the esterification reaction of the shell powder and the polystyrene nano-microspheres, and calcining to obtain porous shell powder; The porous shell powder is used as a carrier, calcium ions in sodium alginate and calcium chloride are subjected to crosslinking reaction, gel microspheres are formed on the surface of the porous shell powder, and the self-repairing agent is wrapped in the gel microspheres to obtain the microcapsule self-repairing agent; Step three, ethylene glycol diglycidyl ether is used as a cross-linking agent, zinc acetate is used as a catalyst, and is chemically bonded with carboxymethyl chitosan and polyvinyl alcohol to obtain a binder; and fourthly, uniformly stirring the porous shell powder, tributyl phosphate and the microcapsule self-repairing agent to obtain a dry mixed material, and stirring and mixing the dry mixed material and the modified binder according to the mass ratio of 10:1 to obtain the high-speed rail sound screen wall self-repairing nano coating.
  2. 2. The preparation method of the self-repairing nano coating for the high-speed rail sound screen wall, which is characterized in that the dosage ratio of the porous shell powder to the tributyl phosphate to the microcapsule self-repairing agent is 70-80g to 3-4g to 20-22g.
  3. 3. The preparation method of the self-repairing nano coating for the high-speed rail sound screen wall, which is disclosed in claim 1, is characterized in that the specific preparation steps of the porous shell powder are as follows: Adding shell powder, polystyrene nano-microspheres with an average particle size of 20nm and 400-500mL of deionized water into a reaction kettle, stirring for 10-12min at 20-25 ℃ and 500-600r/min, then adding 2-5g of hydrochloric acid solution with a concentration of 0.1-0.2mol/L, heating to 80-82 ℃, continuously stirring for 2-4h, transferring the product into a muffle furnace, and calcining for 2-3h at 500-550 ℃ under the protection of nitrogen to obtain porous shell powder; the dosage ratio of the shell powder to the polystyrene nano microsphere to the deionized water to the hydrochloric acid solution is 100-120g, 40-45g, 400-500mL and 2-5g.
  4. 4. The preparation method of the self-repairing nano paint for the high-speed rail sound screen wall, which is characterized by comprising the following specific preparation steps of: Uniformly mixing sodium polyitaconic acid, barium nitride, zinc sulfate and copper sulfate according to the mass ratio of 1-1.2:0.6-0.8:0.5-0.7:0.4-0.6 to obtain the self-repairing agent.
  5. 5. The preparation method of the self-repairing nano paint for the high-speed rail sound screen wall, which is characterized by comprising the following specific preparation steps of: Adding sodium alginate and deionized water into a reaction kettle, stirring for 10-12min at 20-25 ℃ and 500-600r/min, then adding a self-repairing agent, continuously stirring for 30-40min to obtain a mixed solution, dripping the mixed solution into a calcium chloride solution with the mass fraction of 3%, then adding porous shell powder, continuously stirring for 1-2h, filtering, respectively washing a filter cake with deionized water and absolute ethyl alcohol for 2-4 times, and vacuum drying for 1-2h at 60-70 ℃ to obtain a microcapsule self-repairing agent; The dosage ratio of the sodium alginate to the deionized water to the self-repairing agent is 50-60g to 900-920mL to 30-35g, and the dosage ratio of the mixed solution to the calcium chloride solution to the porous shell powder is 70-80mL to 300-320mL to 80-82g.
  6. 6. The preparation method of the self-repairing nano paint for the high-speed rail sound screen wall, which is characterized by comprising the following specific preparation steps of: Adding carboxymethyl chitosan powder and deionized water into a reaction kettle, stirring for 10-12min at 20-25 ℃ and 500-600r/min, then adding glacial acetic acid, regulating the pH to 6.0 with NaOH solution, then adding polyvinyl alcohol, zinc acetate powder and ethylene glycol diglycidyl ether, continuously stirring for 1-2h, filtering, washing a filter cake with deionized water and absolute ethyl alcohol for 2-4 times respectively, and vacuum drying for 1-2h at 60-70 ℃ to obtain the binder.
  7. 7. The method for preparing the self-repairing nano coating for the high-speed rail sound screen wall, which is disclosed in claim 6, is characterized in that the dosage ratio of carboxymethyl chitosan powder, deionized water, glacial acetic acid, polyvinyl alcohol, zinc acetate powder and ethylene glycol diglycidyl ether is 30-40g:700-800mL:10-20mL:50-70g:0.5-0.7g:10-12g.
  8. 8. The preparation method of the self-repairing nano paint for the high-speed rail sound screen wall, which is disclosed in claim 1, is characterized in that the specific preparation steps of the modified binder are as follows: Adding the binder and the octyl phenol polyoxyethylene ether serving as the emulsifier into a reaction kettle, stirring for 10-12min at 80-85 ℃ and 500-600r/min, stirring until the materials are completely dissolved, continuing stirring for reaction for 30-40min, then adding vinyl acetate and potassium persulfate serving as an initiator, heating to 60-65 ℃, preserving heat for 1-2h, cooling to 40-45 ℃, adding sodium bicarbonate to adjust the pH value to 6-7, adding the plasticizer dibutyl phthalate, continuing stirring for 40-50min, naturally cooling, and discharging to obtain the modified binder.
  9. 9. The preparation method of the self-repairing nano coating for the high-speed rail sound screen wall, which is disclosed in claim 8, is characterized in that the dosage ratio of the binder, the octyl phenol polyoxyethylene ether, the vinyl acetate, the potassium persulfate and the dibutyl phthalate is 40-42g:1-2g:20-40mL:1-2g:1-2g.
  10. 10. A self-repairing nano-coating for a high-speed rail sound screen wall, which is prepared by the preparation method of any one of claims 1-9.

Description

Self-repairing nano paint for high-speed rail sound screen wall and preparation method thereof Technical Field The invention belongs to the technical field of paint, and particularly relates to a self-repairing nano paint for a high-speed rail sound screen wall and a preparation method thereof. Background Along with the rapid expansion of the high-speed railway network in China, the running speed of the train is generally up to 200-350km/h, and aerodynamic noise, wheel-rail friction noise and the like generated by high-speed running become main pollution sources along the line environment. The sound barrier is used as a core facility for controlling high-speed rail noise, is widely applied to sensitive areas such as residential areas, schools, hospitals and the like along the line, and the service life and the noise reduction performance of the sound barrier are directly related to the environment protection compliance and the surrounding environment quality of railway operation. The high-speed rail sound screen wall is mainly made of base materials such as concrete and metal, is exposed to outdoor complex environments for a long time, and needs to face multiple severe tests such as natural environment corrosion, high temperature difference, strong ultraviolet irradiation, rain and snow scouring and acid-base pollutant corrosion, ageing, cracking, color changing and peeling of a coating, mechanical action damage such as high-frequency vibration and air flow impact generated by train operation and particle impact, and local damage of the coating, long service period of the sound screen wall, high-altitude operation difficulty, high manual repair cost and influence on normal operation of a railway, and the coating is required to have autonomous repair capability to reduce maintenance frequency. As a first protective barrier of the sound screen wall, the coating not only needs to have excellent weather resistance, corrosion resistance and mechanical strength, but also needs to solve the core pain point which can not be self-healed after the traditional coating is damaged, so that the actual requirement of long-term stable service and low maintenance cost of the high-speed rail sound screen wall can be met. The shell powder biological paint is prepared by taking natural shell powder as a raw material and grinding and a special process, but the shell powder paint has the defects of low bonding strength, no leveling property and the like, is not suitable for extreme environments, is easy to peel and crack especially in a humid environment, and has poor durability and weather resistance and high later maintenance cost. The Chinese patent with publication number CN115340322A discloses a shell powder-based light sound-insulating exterior wall coating and a preparation method thereof, in the scheme, a self-repairing agent is formed by compounding sodium polyitaconic acid, barium nitride, zinc sulfate and copper sulfate, under the action of water excitation, barium nitride is hydrated to form barium hydroxide, and the barium hydroxide reacts with the sodium polyitaconic acid, the zinc sulfate and the copper sulfate mutually, but the barium nitride forms barium hydroxide as an alkaline compound, so that the barium hydroxide can corrode composite resin emulsion serving as a binder, and the service life of the coating is reduced. Disclosure of Invention The invention aims to provide a self-repairing nano coating for a high-speed rail sound screen wall and a preparation method thereof, wherein gel microspheres are formed on the surface of porous shell powder through crosslinking of calcium ions in sodium alginate and calcium chloride, a self-repairing agent is wrapped in the self-repairing agent, the self-repairing agent is formed by compounding sodium polyitaconic acid, barium nitride, zinc sulfate and copper sulfate, under the excitation action of water, barium nitride is hydrated to form barium hydroxide, the barium hydroxide belongs to an alkaline compound, and the corrosion action on a modified binder in a system can be reduced through the wrapping action of microcapsules, so that the self-repairing agent has light sound insulation, and good acid and alkali resistance, washing resistance and compressive strength. The aim of the invention can be achieved by the following technical scheme: A preparation method of a self-repairing nano coating for a high-speed rail sound screen wall comprises the following steps: step one, taking polystyrene nano-microspheres as a sacrificial template, carrying out acid etching on shell powder by hydrochloric acid, and taking the shell powder as a catalyst to catalyze the esterification reaction of the shell powder and the polystyrene nano-microspheres, and calcining to obtain the porous shell powder. And secondly, physically blending sodium polyitaconic acid, barium nitride, zinc sulfate and copper sulfate according to a proportion to obtain a self-repairing agent, taking porous shell