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CN-122011943-A - Low-resistance Wen Fangbing film coating for railway rails and turnouts and preparation method thereof

CN122011943ACN 122011943 ACN122011943 ACN 122011943ACN-122011943-A

Abstract

The invention belongs to the technical field of functional coatings for rail transit, and discloses a low-resistance Wen Fangbing coating film coating for railway rails and switches and a preparation method thereof, wherein the coating film coating is formed by curing a coating composition, the coating composition comprises epoxidized soybean oil ester modified lithium-based grease, fluorosilane modified nano silicon dioxide and boron nitride composite filler, silane-titanate composite custom coupling agent, latent curing agent, antioxidant and ultraviolet absorber. Through the synergistic effect of the low-surface-energy filler and the cold-resistant matrix, the anti-icing performance, the mechanical stability and the bonding performance with the metal substrate of the coating under the low-temperature condition are improved. The invention also provides a preparation method of the film-covered coating, which comprises the steps of preparing a coating composition, preprocessing the surfaces of the steel rails or the turnout, electrostatic spraying and low-temperature curing, and is controllable in technological process, high in applicability and suitable for engineering application of the surfaces of the complex structures of the steel rails and the turnout.

Inventors

  • SHI SONGYAN
  • CHEN WEILUN
  • LIN HAN
  • CHEN RUI
  • MAO YILE
  • LI BOHANG
  • ZHU HONGYU
  • CAO JUN
  • WANG ZIXUAN
  • WANG ZHIYU
  • ZHANG YINUO
  • TIAN XUJIE

Assignees

  • 温州大学

Dates

Publication Date
20260512
Application Date
20260324

Claims (9)

  1. 1. The low-resistance Wen Fangbing coating film for the railway rails and the turnouts is characterized by being formed by curing a coating composition, wherein the coating composition comprises, by weight, 40-60 parts of epoxy soybean oil ester modified lithium-based grease, 15-25 parts of fluorosilane modified nano silicon dioxide and boron nitride composite filler, 2-5 parts of silane-titanate composite custom coupling agent, 3-6 parts of latent curing agent, 0.5-1.5 parts of antioxidant and 0.3-0.8 part of ultraviolet absorber.
  2. 2. The low-resistance Wen Fangbing film coating for railway rails and switches according to claim 1, wherein the mass ratio of the fluorosilane modified nano silicon dioxide to the boron nitride in the fluorosilane modified nano silicon dioxide and boron nitride composite filler is 1 (0.5-2).
  3. 3. The low-resistance Wen Fangbing coating film coating for railway rails and turnouts according to claim 1 is characterized in that the epoxy soybean oil ester modified lithium base grease is prepared by heating the lithium base grease to 90-100 ℃ to enable the lithium base grease to be molten, adding epoxy soybean oil ester and stannous octoate catalyst, stirring for 30-60 min at a constant temperature of 90-100 ℃, and then cooling to 40-50 ℃ to obtain the epoxy soybean oil ester modified lithium base grease, wherein the addition amount of the epoxy soybean oil ester is 20-40% of the mass of the lithium base grease, and the addition amount of the stannous octoate catalyst is 0.1-0.3% of the total mass of the lithium base grease and the epoxy soybean oil ester.
  4. 4. The low-resistance Wen Fangbing film coating for railway rails and turnouts according to claim 1, wherein the fluorosilane modified nano silicon dioxide and the fluorosilane modified nano silicon dioxide in the boron nitride composite filler are prepared by dispersing nano silicon dioxide with the particle size of 20-50 nm in absolute ethyl alcohol, adding perfluorooctyl triethoxysilane, adjusting the pH value of a system to 4-5 by adopting acetic acid, stirring and reacting for 2-3 hours at 60-70 ℃, centrifuging and drying in vacuum for 4-h at 60 ℃, wherein the addition amount of perfluorooctyl triethoxysilane is 5-10% of the mass of the nano silicon dioxide.
  5. 5. The low-resistance Wen Fangbing film coating for railway rails and turnouts according to claim 1 is characterized in that the silane-titanate composite custom-made coupling agent is prepared by mixing gamma-glycidoxypropyl trimethoxysilane and isopropyl triisostearate titanate according to a mass ratio of 2:1, adding absolute ethyl alcohol, stirring for 15-20 min at 40-50 ℃, and cooling to room temperature, wherein the addition amount of the absolute ethyl alcohol is 5-8% of the mass of a mixed system of gamma-glycidoxypropyl trimethoxysilane and isopropyl triisostearate titanate.
  6. 6. The low-resistance Wen Fangbing coating for railway rails and switches according to claim 1, wherein the latent curing agent is imidazole latent curing agent, and is one or more selected from 2-methylimidazole, 2-ethyl-4-methylimidazole and 1-benzyl-2-methylimidazole, and the activation temperature is 70-80 ℃.
  7. 7. A method of preparing the low Wen Fangbing film coating for railway rails and switches as claimed in claim 1, comprising the steps of: S1, heating epoxy soybean oil ester modified lithium-based grease, adding a latent curing agent, stirring until the mixture is uniform, then adding fluorosilane modified nano silicon dioxide, boron nitride composite filler, an antioxidant and an ultraviolet absorbent, and adding a silane-titanate composite customized coupling agent after dispersion treatment to obtain a coating composition; S2, carrying out surface pretreatment on the steel rail or the turnout, and sequentially carrying out sand blasting rust removal, absolute ethyl alcohol degreasing and natural airing; s3, spraying the coating composition on the surface of the pretreated substrate by adopting high-voltage electrostatic spraying equipment; S4, curing the coated substrate to obtain the low-resistant Wen Fangbing film coating.
  8. 8. The preparation method of the low-resistance Wen Fangbing film coating for railway rails and switches according to claim 7, wherein the dispersion treatment in the step S1 comprises high-speed shearing dispersion and ultrasonic dispersion, wherein the rotating speed of the high-speed shearing dispersion is 3000-5000 r/min, the time is 15-20 min, the power of the ultrasonic dispersion is 200-500W, the frequency is 20-40 kHz, the time is 30-40 min, the temperature of a system is controlled to be not more than 50 ℃ in the dispersion process, the stirring temperature after the coupling agent is added is 40-50 ℃, the time is 20-30 min, and the standing and defoaming time is 10-15 min.
  9. 9. The preparation method of the low-resistance Wen Fangbing film coating for railway rails and switches, according to claim 7, is characterized in that the film coating in the step S3 is performed in an electrostatic spraying mode, the spraying voltage is 30-60 kV, the gun distance is 20-30 cm, the spraying speed is 0.5-1 m/S, the thickness of a formed dry film is 50-80 mu m, the curing treatment in the step S4 is performed under the condition of 60-80 ℃, and the curing time is 1-2 h.

Description

Low-resistance Wen Fangbing film coating for railway rails and turnouts and preparation method thereof Technical Field The invention belongs to the technical field of functional coatings for rail transit, and particularly relates to a low-resistance Wen Fangbing film coating for railway rails and switches and a preparation method thereof. Background In cold and alpine regions, the railway is exposed to complex environments such as low temperature, high humidity, wind and snow, frequent freeze thawing cycles and the like for a long time in winter, and the phenomena of icing, snow accumulation and frost are extremely easy to occur on the surfaces of the steel rails and the turnout, and particularly, the icing problem is more remarkable at the parts with complex structures and concentrated stress such as switch rails, slide plates and switch rails. The formation of the ice layer not only can reduce the adhesion performance between the wheel tracks and increase the braking distance, but also can cause the switch to be converted inflexibly, blocked or even invalid, and can cause driving accidents when serious, thereby bringing great hidden trouble to railway transportation safety. Currently, anti-icing measures for railway rails and switches mainly comprise modes of manual or mechanical ice cleaning, chemical ice melting agents and surface protective coatings. The chemical deicing agent needs to be frequently applied, and the operation and maintenance cost is high. In contrast, the anti-icing coating is used as a passive protection means, has the advantages of flexible construction, long duration of action and small interference to operation, and is gradually paid attention to. However, most of the existing anti-icing coatings are universal super-hydrophobic or low-surface-energy coatings, and are mainly applied to the fields of building, aviation or wind power, so that the comprehensive use requirements of railway rails and turnouts under heavy load, high-frequency friction and extremely low temperature conditions are difficult to meet. On one hand, part of the super-hydrophobic coating depends on a micro-nano structure to realize an anti-icing effect, is easily damaged under the action of external force impact or wheel rail friction, has insufficient wear resistance, and on the other hand, a plurality of coatings are easily embrittled in a low-temperature environment, so that the adhesive force is reduced, even the coating is peeled off, and long-term service is difficult. In addition, the existing coating system has limited construction adaptability to the complex structure of the turnout, and the thickness and the performance uniformity of the coating are difficult to ensure. Disclosure of Invention In order to solve the defects in the background technology, the invention aims to provide a low-resistance Wen Fangbing coating film coating for railway rails and turnouts and a preparation method thereof, and the coating film coating is applied to engineering application of complex structure surfaces of railway rails and turnouts by constructing a coating system which takes epoxy soybean oil ester modified lithium-based resin as a matrix, and fluorosilane modified nano silicon dioxide and boron nitride composite filler to cooperatively enhance the anti-icing property, the adhesive force and the durability of the coating under a low-temperature environment, and adopting electrostatic spraying and low-temperature curing processes. The aim of the invention can be achieved by the following technical scheme: The low-resistance Wen Fangbing coating film for the railway rails and the turnouts is formed by curing a coating composition, wherein the coating composition comprises, by weight, 40-60 parts of epoxidized soybean oil ester modified lithium base grease, 15-25 parts of fluorosilane modified nano silicon dioxide and boron nitride composite filler, 2-5 parts of silane-titanate composite custom coupling agent, 3-6 parts of latent curing agent, 0.5-1.5 parts of antioxidant and 0.3-0.8 part of ultraviolet absorber. Further preferably, in the fluorosilane-modified nano silica and boron nitride composite filler, the mass ratio of the fluorosilane-modified nano silica to the boron nitride is1 (0.5-2). Further preferably, the epoxidized soybean oil ester modified lithium-based grease is prepared by heating the lithium-based grease to 90-100 ℃ to melt the lithium-based grease, adding the epoxidized soybean oil ester and the stannous octoate catalyst, stirring the mixture for 30-60 min at a constant temperature of 90-100 ℃, and then cooling the mixture to 40-50 ℃ to obtain the epoxidized soybean oil ester modified lithium-based grease, wherein the addition of the epoxidized soybean oil ester is 20-40% of the mass of the lithium-based grease, and the addition of the stannous octoate catalyst is 0.1-0.3% of the total mass of the lithium-based grease and the epoxidized soybean oil ester. Further preferably, the fluorosilane mo