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CN-121991641-A - Preparation method of lignin-based organic phase change material

CN121991641ACN 121991641 ACN121991641 ACN 121991641ACN-121991641-A

Abstract

The invention belongs to the field of phase change energy storage temperature control materials of organic systems, and provides a preparation method of a lignin-based organic phase change material, which comprises the following raw materials, by weight, 86% -97% of erythritol, 2% -5% of hexagonal boron nitride, 0.5% -2% of lignin compatibilizer and 0.5% -10% of expanded graphite, wherein the sum of the mass percentages of the raw materials is 100%. According to the invention, the compatibility of the phase change material and other components is improved by adding the lignin compatibilizer, and the stability of the whole material is improved by regulating and controlling the formula. The energy storage temperature control phase change material provided by the invention has the advantages of proper phase change temperature, high phase change enthalpy, low supercooling degree, good circulation stability and no obvious phase separation phenomenon, and is a proper thermal physical energy storage technology.

Inventors

  • Qi Letian
  • LI XIANGXU
  • XUE YU
  • LIN ZHAOYUN
  • YANG GUIHUA
  • CHANG YUTONG
  • LI ZONGYUE
  • CHEN JIACHUAN

Assignees

  • 齐鲁工业大学(山东省科学院)

Dates

Publication Date
20260508
Application Date
20260202

Claims (10)

  1. 1. A lignin-based organic phase change material is characterized by comprising, by weight, 86% -97% of erythritol, 2% -5% of hexagonal boron nitride, 0.5% -2% of a lignin compatibilizer and 0.5% -10% of expanded graphite, wherein the sum of the mass percentages of the raw materials is 100%.
  2. 2. The lignin-based organic phase change material according to claim 1, wherein lignin raw material and a treating agent are mixed and heated, and the lignin compatibilizer is obtained by filtering, concentrating and drying after the heating treatment; The preparation method of the treating agent comprises the steps of mixing n-hexanol and 1, 8-diazabicyclo [5.4.0] undec-7-ene (DBU) in a molar ratio of 1:10-10:1, mixing the mixed solution and water in a molar ratio of 1:10-10:1, and then introducing CO 2 into the mixed solution; or, the lignin raw material is at least one selected from wood chips, wheat straws, straws and industrial lignin raw materials containing lignin components; Or, the industrial lignin raw material is at least one selected from clarson lignin, sodium lignin sulfonate, alkali lignin and dealkalized lignin.
  3. 3. The lignin-based organic phase change material according to claim 1 wherein the lignin-based organic phase change material has a phase transition temperature of 80 ℃ to 140 ℃.
  4. 4. The lignin-based organic phase change material according to claim 1 wherein the expanded graphite is platelet, vermiform, porous, fibrous or nanoscale.
  5. 5. The lignin-based organic phase change material according to claim 4 wherein the preparation method of the vermiform expanded graphite is microwave treatment with power of 200-1000W and heating time of 5-10 min.
  6. 6. A method for preparing a lignin-based organic phase change material, comprising: mixing erythritol, hexagonal boron nitride and lignin compatibilizer, and heating until the mixture is completely melted to obtain a molten mixture; Adding expanded graphite into the molten mixture, and uniformly mixing to obtain a graphite adsorption phase change material; Pouring the graphite adsorption phase change material into a mould, and cooling and shaping to obtain the product.
  7. 7. The method for preparing the lignin-based organic phase change material according to claim 6, wherein the heating is performed to 150-170 ℃ and the temperature is kept for 10-30 min.
  8. 8. The method for preparing the lignin-based organic phase change material according to claim 6, wherein the expanded graphite and the molten mixture are mixed under the condition of ultrasonic stirring, the ultrasonic treatment power is 200-1000W, and the ultrasonic treatment time is 5-10 min.
  9. 9. The method of preparing a lignin-based organic phase change material according to claim 6 wherein the cooled temperature is Cooling at 5~0-20 min.
  10. 10. Use of the lignin-based organic phase change material according to any one of claims 1 to 5 in energy, construction, electronics, transportation applications.

Description

Preparation method of lignin-based organic phase change material Technical Field The invention belongs to the field of phase change energy storage temperature control materials of organic systems, and relates to a preparation method of a lignin-based organic phase change material. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. The phase change energy storage materials (PCMs) have unique application values in various fields such as industrial waste heat recovery, building energy conservation, electronic equipment temperature control and the like by virtue of the unique advantages of high energy storage density, stable phase change temperature, approximate isothermal heat absorption and release process and the like, and are important materials for pushing energy systems to clean low-carbon transformation. However, the formulation design of the current phase change energy storage material still has many imperfections, such as severe supercooling and phase separation of the inorganic phase change material, large cost span of the organic phase change material, complex preparation process of the composite phase change material, and the like, which directly limit the energy storage performance, service life and application scene of the material, and obstruct the progress of the material from laboratory research and development to large-scale application. Accordingly, phase Change Materials (PCMs) are undergoing a paradigm shift from traditional petroleum-based materials to biobased materials as a core medium for thermal energy storage and management. Lignin-based organic phase change materials become a key break-through for this transition by virtue of their unique biomass properties. The research discloses a lignin-based energy storage temperature control material which comprises, by mass, 85-97.5% of a main phase change material, 1-5% of a nucleating agent, 1-5% of water-soluble lignin and 0.5-5% of a forming agent, wherein the lignin is added to replace a traditional thickening agent, and the forming agent is added to stabilize the form of the lignin-based energy storage temperature control material, so that the phase change temperature of the material is stabilized within a range of 80-90 ℃. The phase change enthalpy value of the material is 234.12J/g, but the phase separation problem cannot be avoided, and the phase change enthalpy value is seriously attenuated after repeated cyclic use. The organic base stable supercooled sugar alcohol long-term heat storage composite phase change material is disclosed. The composite phase change material uses organic alkali including but not limited to polyamine compound (such as diethylenetriamine), nitrogen-containing heterocyclic compound (such as 1, 8)Diazabicyclo [5.4.0] undec7Alkene, DBU for short) and organic alkaline metal compound (such as potassium tert-butoxide and sodium tert-butoxide) are used as additives, and erythritol, xylitol, mannitol and inositol are used as main energy storage agents. The phase change enthalpy value of the organic phase change material prepared by the formula is 254.9J/g, but the phase change performance of the organic phase change material is still to be improved. Disclosure of Invention In order to solve the problems, the invention provides a preparation method of a lignin-based organic phase change material. According to the invention, the compatibility of the phase change material and other components is improved by adding the lignin compatibilizer, and the stability of the whole material is improved by regulating and controlling the formula. The energy storage temperature control phase change material provided by the invention has the advantages of proper phase change temperature, high phase change enthalpy, low supercooling degree, good circulation stability and no obvious phase separation phenomenon, and is a proper thermal physical energy storage technology. In order to achieve the above purpose, the present invention adopts the following technical scheme: According to the first aspect of the invention, a lignin-based organic phase change material is provided, which comprises, by weight, 86% -97% of erythritol, 2% -5% of hexagonal boron nitride, 0.5% -2% of lignin compatibilizer and 0.5% -10% of expanded graphite, wherein the sum of the mass percentages of the raw materials is 100%. Mixing mechanism: In the composite phase change material system, erythritol serves as a main phase change component to play a core heat storage and release function, hexagonal boron nitride, a lignin compatibilizer and expanded graphite serve as functional auxiliary agents, and material performances are optimized from the dimensions of nucleation, rheology, molding and the like. Eryt