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CN-121991519-A - High-temperature-regulating type weak-crosslinking shape-stabilizing phase-change elastomer material, preparation method thereof and application thereof in modified asphalt

CN121991519ACN 121991519 ACN121991519 ACN 121991519ACN-121991519-A

Abstract

The invention discloses a high-temperature-regulating weak-crosslinking shape-stabilizing phase-change elastomer material, a preparation method thereof and application thereof in modified asphalt, and relates to the technical field of phase-change temperature-regulating materials and asphalt materials for road engineering. The raw material component system of the high-temperature-regulating weak-crosslinking dimensionally stable phase-change elastomer material comprises a continuous phase matrix component, a phase-change component and a weak-crosslinking initiating component, wherein the continuous phase matrix component is used for constructing a continuous phase interpenetrating network, the phase-change component is used for realizing molecular level limit in an interpenetrating network structure formed by the continuous phase matrix component through low-density covalent crosslinking points of the phase-change component and inhibiting migration and leakage of the phase-change component in a molten state, and the weak-crosslinking initiating component is used for initiating formation of a weak-crosslinking three-dimensional network in the continuous phase matrix component, so that the thermoplastic processability of the system is maintained, and simultaneously, the dimensionally stable phase-change structure is given to the phase-change component. The material is used as a modifier to be mixed into matrix asphalt, so that the high-temperature regulation function of an asphalt pavement can be realized, and the mechanical and rheological properties of the modified asphalt are improved.

Inventors

  • YAN KEZHEN
  • LI HAO
  • HUANG JUNXIAN

Assignees

  • 湖南大学

Dates

Publication Date
20260508
Application Date
20260213

Claims (10)

  1. 1. The high-temperature-regulating type weak-crosslinking type phase-stabilizing elastomer material is characterized in that the preparation raw materials of the temperature-regulating type weak-crosslinking type phase-stabilizing elastomer material comprise the following component systems: A continuous phase matrix component for constructing a continuous phase interpenetrating network; The phase change component is used for realizing molecular level limit in an interpenetrating network structure formed by the continuous phase matrix component through low-density covalent crosslinking points of the phase change component and inhibiting migration and leakage of the phase change component in a molten state; And the weak crosslinking initiation component is used for initiating formation of a weak crosslinking three-dimensional network in the continuous phase matrix component, and endowing the system with a dimensionally stable phase change structure while maintaining the thermoplastic processability of the system.
  2. 2. The high-temperature-regulating type weakly cross-linked dimensionally stable phase change elastomer material according to claim 1, wherein, The continuous phase matrix component is one or the combination of SEBS and POE; the phase change component is paraffin PW; the weak crosslinking initiation component is peroxide DTBP.
  3. 3. The high-temperature-regulating type weakly cross-linked dimensionally stable phase change elastomer material according to claim 2, wherein, PW accounts for 50-80% of the total composition system in percentage by mass, DTBP accounts for 1-2% of the total composition system in percentage by mass, the balance is a continuous phase matrix component, and when the continuous phase matrix component is a combination of SEBS and POE, the mass ratio of SEBS to POE is 1-3:3-1.
  4. 4. The high-temperature-regulating weak-crosslinking shape-stabilizing phase-change elastomer material according to any one of claims 1-3, which is characterized in that the material is mixed into matrix asphalt in proportion, so that the high-temperature regulating function of an asphalt pavement can be realized, and the mechanical and rheological properties of modified asphalt are improved.
  5. 5. A method for preparing the high-temperature-regulating weak-crosslinking dimensionally stable phase-change elastomer material according to any one of claims 1 to 4, comprising the following steps: S1, firstly, placing a paraffin phase-change material PW in a reaction vessel, heating at 60-90 ℃ and preserving heat for 10-60 min to enable the PW to be completely melted; S2, adding SEBS in a preset proportion, heating the system to 80-120 ℃, and blending for 20-60 min under the condition of continuous stirring to ensure that the SEBS is fully melted and uniformly mixed with PW; S3, adding POE in a preset proportion, and continuously stirring for 20-60 min to finish the melt blending of the components; S4, raising the temperature of the system to 110-140 ℃, slowly dropwise adding the DTBP of the di-tert-butyl peroxide with a preset proportion, continuously raising the temperature to 150-190 ℃ after the dropwise adding is finished, carrying out heat preservation reaction for 10-30 min to induce formation of a low-density covalent cross-linking network in the SEBS/POE continuous phase, and naturally cooling and solidifying a molten material to room temperature after the reaction is finished to obtain the high-temperature-regulating type weak cross-linking shape stable phase change elastomer material.
  6. 6. The modified asphalt is prepared by mixing the high-temperature-regulating weak-crosslinking stable-phase-change elastomer material according to any one of claims 1-4 or the high-temperature-regulating weak-crosslinking stable-phase-change elastomer material prepared by the preparation method according to claim 5 into matrix asphalt as a modifier.
  7. 7. The modified asphalt with high temperature and temperature regulation according to claim 6, wherein the preparation method comprises the following steps: (1) Heating the matrix asphalt to melt; (2) Then the high-temperature-regulating weak-crosslinking shape-stabilizing phase-change elastomer material is proportionally mixed into the matrix asphalt in the molten state in the step (1), and is fully dispersed in the matrix asphalt by high-speed shearing; (3) After shearing, stirring at high speed to eliminate bubbles in the system, and naturally cooling to room temperature.
  8. 8. The modified asphalt of claim 7, wherein the blending ratio of the phase-stable elastomer material of the middle and high temperature regulation type is 2.5-15% of the mass of the matrix asphalt.
  9. 9. The modified asphalt of claim 7, wherein the asphalt is a modified asphalt having a high temperature and a temperature, (1) The medium matrix asphalt is heated and melted for 0.5-2 hours at 120-160 ℃; (2) The medium-high speed shearing condition is that shearing is carried out for 0.5-2 hours at the temperature of 130-160 ℃ at the speed of 2000-5000 r/min; (3) The condition of medium-high speed stirring is 1500-3000 r/min for 10-40 min.
  10. 10. The application of the high-temperature-regulating type weak-crosslinking type stable phase-change elastomer material prepared by the preparation method of any one of claims 1-3 or the preparation method of any one of claims 4-5 in preparing modified asphalt.

Description

High-temperature-regulating type weak-crosslinking shape-stabilizing phase-change elastomer material, preparation method thereof and application thereof in modified asphalt Technical Field The invention relates to the technical field of phase-change temperature-regulating materials and asphalt materials for road engineering, in particular to a high-temperature-regulating weak-crosslinking shape-stable phase-change elastomer material, a preparation method thereof and application thereof in modified asphalt. Background The asphalt pavement is easy to generate obvious heat accumulation effect under strong solar radiation in summer and continuous high-temperature environment, the temperature of the pavement surface is increased to induce the viscoelasticity of asphalt binder to be converted into viscous flow dominant, so that the risk of high-temperature permanent deformation (rutting) is increased, the thermo-oxidative aging process is accelerated, and the service life of the pavement structure is shortened. The existing high-temperature modification technology of asphalt aims at improving high-temperature modulus and elastic recovery capacity, and deformation can be restrained to a certain extent, but active regulation and control of a pavement temperature field are difficult to realize, and material degradation driving caused by temperature rise rate and temperature peak cannot be effectively reduced. The Phase Change Material (PCM) is adopted to realize thermal buffering and temperature regulation by utilizing latent heat absorption, and is an effective way for improving the thermal environment of the pavement. The Phase Change Material (PCM) can realize thermal buffering and temperature peak clipping through absorbing and releasing latent heat in a solid-liquid phase change region, and is an important material system for passive temperature regulation. Among them, paraffin PCM is widely used due to its selectable phase transition temperature range, high latent heat and good chemical stability. However, paraffin PCM has significant fluidity in the phase transition melting stage, has molecular migration and flow tendency, is easy to leak and migrate after being directly mixed into asphalt or simply compounded, and leads to thermal performance attenuation and structural instability, and the melting PCM can significantly reduce the effectiveness of a high-temperature bearing framework of the system, so that the high-temperature rheological performance is reduced. Engineering applications therefore typically require a "form-stable" design, i.e. confining the PCM in a composite system by means of a supporting phase/network structure, so that it remains macroscopically stable during phase changes and maintains reversible latent heat storage and release capabilities. In order to realize shape stabilization, the prior art generally adopts three strategies, namely, porous carrier adsorption or coating (such as expanded graphite, porous carbon, mineral carrier and the like), pore capillary force and surface adsorption are utilized to inhibit leakage, a microcapsule/coating structure is utilized to isolate molten PCM through a shell layer, and polymer matrix shape stabilization is compounded, and the PCM is subjected to domain limiting by utilizing a phase separation structure, physical entanglement or chemical crosslinking network of a thermoplastic elastomer. Wherein thermoplastic elastomers such as SEBS (STYRENE ETHYLENE Butylene Styrene) have microphase separation structures of hard segment domains-soft segment continuous phases, the hard segments can serve as physical crosslinking points to provide morphological support, and the soft segments can accommodate the volume change of the PCM and maintain the flexibility of the composite material, so the thermoplastic elastomers are considered to be effective matrixes for constructing the dimensionally stable phase change composite material. For improving the chain continuity and the processability, OBC (olefin block copolymer), POE (Polyolefin Elastomer) and the like are often compounded with SEBS, and for improving the heat conduction and the structural stability, the fillers such as expanded graphite, fiber and the like are also often introduced into the temperature control research in the fields of battery heat management, building energy conservation and the like. However, the prior art researches are mainly focused on the direction of a weak crosslinking construction method of the SEBS-based dimensionally stable phase-change composite material. Specifically, if SEBS, OBC (or similar polyolefin elastomer) and paraffin are adopted for fusion compounding, and di-tert-butyl peroxide (DCP) is used as a free radical initiator to form a low-density covalent cross-linking network in a polymer matrix, so that the space confinement effect of the matrix on the phase change material is enhanced, and the morphological stability and the thermal cycle reliability of the composi