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CN-122011261-A - Vehicle-mounted high-temperature-resistant phase-change acrylic polymer and preparation method thereof

CN122011261ACN 122011261 ACN122011261 ACN 122011261ACN-122011261-A

Abstract

The invention relates to the field of high molecular polymers, and particularly discloses a vehicle-mounted high-temperature-resistant phase-change acrylic polymer and a preparation method thereof. The invention realizes the stepwise heat absorption from low temperature to medium temperature through the ternary polymerization of the reaction monomers, the compounding of the phase change material and the multiple crosslinking agents, and can maintain the temperature of the chip side below the safety threshold more permanently when facing the rapid and severe high-temperature thermal shock in fire.

Inventors

  • LIU QIFENG
  • QIU WENJIE
  • SUN HUANLE
  • Gan Shengbing

Assignees

  • 道麒信创(浙江)科技有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. The vehicle-mounted high-temperature-resistant phase-change acrylic polymer is characterized by comprising a reaction monomer, a phase-change microcapsule and an internal crosslinking agent, wherein the reaction monomer comprises acrylic acid, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid.
  2. 2. The vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 1, wherein the mass ratio of acrylic acid to acrylamide to 2-acrylamide-2-methylpropanesulfonic acid is (65-75): 15-25): 5-15.
  3. 3. The vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 1, wherein the internal crosslinking agent comprises (0.4-0.6) N, N' -methylenebisacrylamide and trimethylolpropane triacrylate in a mass ratio of 1.
  4. 4. The vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 1, wherein the internal crosslinking agent accounts for 0.1-0.2% of the total mass of the reaction monomers.
  5. 5. The vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 1, wherein the phase-change microcapsules account for 5-8% of the total mass of the reaction monomers.
  6. 6. The vehicle-mounted high temperature resistant phase change acrylic polymer according to claim 1, wherein the phase change microcapsule is prepared by the steps of: The preparation method comprises the steps of evenly melting composite salt and Span-80 at 70-80 ℃ to obtain an oil phase, evenly mixing 1-2wt% of PVA aqueous solution and SDS at 60-70 ℃ to obtain a water phase, pouring the oil phase into the water phase, shearing at 9000-12000 rpm for 3-8 min to form o/w emulsion, cooling the o/w emulsion to 50-60 ℃, firstly introducing inert gas for purging, then heating to 60-80 ℃, adding methyl methacrylate and AIBN, reacting for 2-4 h, carrying out suction filtration and vacuum drying to obtain the phase-change microcapsule.
  7. 7. The vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 6, wherein the composite salt comprises sodium sulfate decahydrate and magnesium nitrate hexahydrate in a mass ratio of (6-9): (1-4).
  8. 8. A method for preparing the vehicle-mounted high temperature resistant phase change acrylic polymer according to any one of claims 1 to 7, comprising the following preparation steps: S1, uniformly mixing potassium persulfate with a reaction monomer, adding a sodium hydroxide aqueous solution at 0-5 ℃, and stirring for 20-30 min to obtain a monomer aqueous solution; s2, taking out 30-50 v% of monomer aqueous solution, adding phase-change microcapsules, stirring at normal temperature of 500-600 rpm for 10-20 min, then introducing inert gas at 40-60 ℃ and 150-250 rpm for purging to obtain capsule suspension, adding an internal cross-linking agent into the residual monomer aqueous solution, dropwise adding the residual monomer aqueous solution into the capsule suspension under the protection of the inert gas after dissolving, controlling the dropwise adding time to be 30-40 min, continuing stirring for 10-15 min after dropwise adding, then standing for 8-12 h at 40-60 ℃, then heating to 60-80 ℃ and standing for 1-3 h to obtain polymer gel; s3, cutting, drying and crushing the polymer gel, and sieving through 10-40 meshes to obtain crosslinked polymer particles; And S4, taking cross-linked polymer particles, uniformly stirring the cross-linked polymer particles and the surface cross-linking agent solution, and then placing the mixture in a heat treatment mode at 120-140 ℃ for 30-60 min to obtain the vehicle-mounted high-temperature-resistant phase-change acrylic polymer.
  9. 9. The method for preparing the vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 8, wherein in the step S4, the surface cross-linking agent solution is prepared by mixing 5-10 wt% of glycidyl ether, 40-50 wt% of methanol and 40-50 wt% of water according to 100 wt%.
  10. 10. The method for preparing the vehicle-mounted high-temperature-resistant phase-change acrylic polymer according to claim 9, wherein in the step S4, the mass ratio of the crosslinked polymer particles to the surface crosslinking agent solution is 1 (0.06-0.07).

Description

Vehicle-mounted high-temperature-resistant phase-change acrylic polymer and preparation method thereof Technical Field The invention belongs to the field of high molecular polymers, and particularly relates to a vehicle-mounted high-temperature-resistant phase-change acrylic polymer and a preparation method thereof. Background The running safety of the motor train unit is a life line of national transportation. As the core of train safety monitoring, a black box (event recorder) of a motor train bears the heavy duty of recording mass data such as train running state, key parameters, control instructions and the like, and is the ultimate basis of accident analysis, responsibility definition and safety improvement. However, in extremely rare major accidents, especially with concomitant fires, prolonged high temperatures can occur, which pose a devastating threat to the data storage chip that is the core inside the black box. Traditional protective materials (such as epoxy resin and silica gel) are extremely easy to decompose, carbonize or melt under the severe thermal environments, lose the protective effect, finally lead to chip fusion and data permanent loss, and lead to losing the most critical technical support for accident investigation. The unique thermal response and high latent heat characteristics of the hydrogel material can generate phase change at high temperature, and the moisture contained in the hydrogel material absorbs a large amount of heat when vaporizing, so that a short thermal barrier is formed around the chip, the heat transfer is effectively delayed, and precious survival time is strived for a core data storage area. In the prior art, with respect to high-temperature-resistant acrylic acid, patent CN118546627A discloses a high-temperature-resistant high-peel force acrylic acid pressure-sensitive adhesive and a preparation method thereof, modified mica powder is introduced into acrylic acid adhesive to improve heat resistance, however, in the method, mica density is high, sedimentation is easy, and a heat-resistant weak point can appear. Patent CN117126325B discloses a high temperature resistant carboxylic acid type acrylate rubber and a method for manufacturing the same, wherein the continuous upper heat resistance limit of ACM is raised from 150 ℃ to 170 ℃ through common monomer compounding, however, there is still a large progress space for the high temperature resistance of the carboxylic acid type acrylate rubber. Under the background, the invention aims to develop the high-performance high-temperature-resistant acrylic hydrogel special for protecting the black box data storage chip, so that the high-performance high-temperature-resistant acrylic hydrogel can provide more durable and reliable heat insulation protection for the chip at extremely high temperature, enhance the data storage rate of the black box in extreme accidents, and provide a solid material foundation for constructing a railway safety system with higher toughness. Disclosure of Invention In order to overcome the defects in the prior art, the high-temperature-resistant acrylic hydrogel material is constructed by ternary polymerization of reaction monomers, compounding of phase-change materials and multiple crosslinking of the materials, so that stepped heat absorption from low temperature to medium temperature is realized, and the temperature of a chip side can be maintained below a safety threshold more permanently when the chip side is subjected to rapid and severe high-temperature thermal shock in a fire disaster. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The invention provides a vehicle-mounted high-temperature-resistant phase-change acrylic polymer, which comprises reaction monomers, phase-change microcapsules and an internal crosslinking agent, wherein the reaction monomers comprise acrylic acid, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid. In some embodiments, the mass ratio of the acrylic acid to the acrylamide to the 2-acrylamide-2-methylpropanesulfonic acid is (65-75): (15-25): (5-15). Compared with the method for preparing the monomer by using single acrylic acid as the reaction monomer, the method provided by the invention has the advantages that the thermal cracking temperature of the cross-linked network is increased by using the ternary polymerization system of acrylic acid, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid so as to keep the framework intact, and a stable cavity is provided for the secondary vaporization-condensation of the capsule. Wherein, the introduction of the Acrylamide (AM) can improve the water solubility, the gel forming capability and the mechanical strength of the polymer, and the amide group of the acrylamide can form more hydrogen bonds with the polyacrylic acid chain, so that the crosslinked network is tougher. The sulfonic acid group with strong hydrophilicity of the 2-acrylamide-2-methylprop