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CN-120290003-B - High-enthalpy flexible phase change material and preparation method and application thereof

CN120290003BCN 120290003 BCN120290003 BCN 120290003BCN-120290003-B

Abstract

The invention discloses a high-enthalpy flexible phase change material, a preparation method and application thereof, and relates to the technical field of polymer composite materials. The preparation method comprises the steps of taking maleic anhydride as a grafting agent, taking a polyolefin thermoplastic elastomer as a grafting object, preparing a grafting modified thermoplastic elastomer, adding a cross-linking agent and a phase change material into the grafting modified thermoplastic elastomer, and carrying out melt blending to obtain the high-enthalpy flexible phase change material. The preparation method has the advantages that the three-dimensional crosslinked network is constructed through the construction of the three-dimensional crosslinked network, the three-dimensional crosslinked network is constructed through the introduction of the anhydride-alcohol ester dynamic bond, the reinforcing and toughening of the organic solid-liquid phase material are realized, the high energy storage density is realized, the polymer support structure can better cover the phase change material through the introduction of the crosslinked network, the content of the phase change material is ensured, and the high energy storage density is endowed.

Inventors

  • YANG WEI
  • LIU WEIWEI
  • Feng changping
  • CHEN MEI
  • BAI LU
  • YANG JIE

Assignees

  • 四川大学
  • 江苏恒度相变科技有限公司

Dates

Publication Date
20260508
Application Date
20250522

Claims (8)

  1. 1. The preparation method of the high-enthalpy flexible phase change material is characterized by comprising the following steps of: S1, taking maleic anhydride as a grafting agent and a thermoplastic elastomer as a grafting object to prepare a grafting modified thermoplastic elastomer, wherein the thermoplastic elastomer is at least one selected from ethylene-octene copolymer, ethylene-butene copolymer, olefin block copolymer and styrene-ethylene-butene-styrene block copolymer; s2, adding a cross-linking agent and a phase change material into the grafted and modified thermoplastic elastomer, and carrying out melt blending to obtain a high-enthalpy flexible phase change material, wherein the cross-linking agent is an alcohol compound which is subjected to esterification reaction with maleic anhydride grafted onto the thermoplastic elastomer, the phase change material is selected from paraffin, and the cross-linking agent is at least one of glycerol, propylene glycol and hexanediol; wherein, the weight portions of the components are as follows: 10-30 parts by weight of a thermoplastic elastomer; 70-90 parts of phase change material; 1-4 parts by weight of grafting agent; 1-4 parts of cross-linking agent.
  2. 2. The method for preparing a high enthalpy flexible phase change material according to claim 1, wherein step S1 and step S2 are performed in an internal mixer or an extruder.
  3. 3. The method for preparing a high enthalpy flexible phase change material according to claim 1, wherein the temperature of blending treatment in step S1 and step S2 is 150-160 ℃.
  4. 4. The method for preparing a high enthalpy flexible phase change material according to claim 1, wherein step S1 includes grafting maleic anhydride to the thermoplastic elastomer by melt blending with peroxide as an initiator.
  5. 5. The method for preparing a flexible phase change material with high enthalpy value according to any one of claims 1 to 4, wherein in step S2, the cross-linking agent is added first for cross-linking and then the phase change material is added for uniform blending, or the phase change material is added for uniform blending and then the cross-linking agent is added for cross-linking.
  6. 6. The flexible phase change material with high enthalpy value prepared by the preparation method of any one of claims 1 to 5.
  7. 7. The use of the high enthalpy flexible phase change material according to claim 6, characterized in that the high enthalpy flexible phase change material is used for preparing a flexible phase change film.
  8. 8. The use according to claim 7, wherein the high enthalpy flexible phase change material is formed into a flexible phase change film by a hot pressing, film blowing or casting method.

Description

High-enthalpy flexible phase change material and preparation method and application thereof Technical Field The invention relates to the technical field of polymer composite materials, in particular to a high-enthalpy flexible phase change material, a preparation method and application thereof. Background As electronic devices move toward miniaturization, higher power, and higher integration, with the accumulation of large amounts of heat, failure is accelerated if heat is not dissipated efficiently in time. Phase change materials (PCMs for short) can absorb or release heat in the form of latent heat during phase change and maintain relatively stable temperature. When the phase change material is used as a thermal management component, the temperature of equipment can be controlled, thermal runaway can be prevented, the temperature distribution can be more uniform, and heat accumulation can be prevented. The traditional organic solid-liquid phase-change material has the advantages of large energy storage density, low supercooling degree, wide phase transition temperature range, good chemical stability and the like, is widely focused, but is easy to break in brittleness and cannot be suitable for application scenes requiring flexibility, such as flexible electronic device thermal management, wearable technology and the like. Therefore, the mechanical property, particularly the flexibility, of the organic solid-liquid phase-change material is improved, and the organic solid-liquid phase-change material is very important for development and practical application. At present, strategies for preparing flexible phase change materials can be roughly divided into flexible porous support materials, flexible shell packaging and polymer network-based structures. Compared with the high-cost porous material and flexible shell layer package, the polymer represented by polyolefin elastomer (POE) as the support material of the flexible phase change material has the advantages of simple process, low cost and abundant raw material sources, has large-scale preparation potential, and still needs to further optimize the performance through the design of a polymer network structure to realize the balance of the energy storage density, flexibility and processing performance of the material. Therefore, the development of the phase change material with excellent mechanical properties and high energy storage density and the large-scale preparation strategy thereof have important significance. Disclosure of Invention Aiming at the defects, the application provides the high-enthalpy flexible phase change material with enhanced mechanical properties and the preparation method thereof, the obtained phase change material realizes the enhancement of mechanical properties while ensuring the energy storage density by regulating and controlling the cross-linking network density, and the thermoplastic elastomer matrix realizes better coating of the phase change component due to the formation of the cross-linking structure, ensures that the phase change component cannot leak under the high temperature condition, and enhances the shape stability of the composite material under the high temperature. According to the application, the flexible phase change material with high enthalpy and super toughness is prepared through the synergistic effect of the crosslinking reaction of anhydride-alcohol ester and polyolefin coated paraffin, and the preparation method of the phase change material can realize large-scale industrial production. In order to achieve the above object, in one aspect, the present invention provides a method for preparing a flexible phase change material with high enthalpy, comprising the steps of: S1, taking maleic anhydride as a grafting agent and a thermoplastic elastomer as a grafting object to prepare a grafting modified thermoplastic elastomer, wherein the thermoplastic elastomer is at least one selected from ethylene-octene copolymer, ethylene-butene copolymer, olefin block copolymer and styrene-ethylene-butene-styrene block copolymer; S2, adding a cross-linking agent and a phase change material into the grafted and modified thermoplastic elastomer, and carrying out melt blending to obtain the high-enthalpy flexible phase change material, wherein the cross-linking agent is an alcohol compound which is subjected to esterification reaction with maleic anhydride grafted onto the thermoplastic elastomer, and the phase change material is paraffin. The mechanism involved in the preparation of the high enthalpy flexible phase change material is that maleic anhydride is grafted onto a polyolefin chain, and ethylene-octene copolymer, ethylene-butene copolymer, olefin block copolymer, styrene-ethylene-butene-styrene block copolymer and the like are selected as grafting targets, wherein in the block copolymers, maleic anhydride grafting is more prone to be grafted onto a non-ethylene block because the free radical stability formed by t