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CN-121975499-A - Phase change material and temperature control transport case applied by same

CN121975499ACN 121975499 ACN121975499 ACN 121975499ACN-121975499-A

Abstract

The invention discloses a phase change material and a temperature control transport case applied by the phase change material, belonging to an application mode of the phase change material, wherein the phase change material comprises, by weight, 70-75% of n-tetradecane, 12-16% of polyethylene glycol, 7-10% of nano silicon dioxide, 2-6% of polyurea resin, 0.4-0.6% of dibutyl hydroxy toluene and 0.4-0.6% of melamine. The phase change material with specific phase change temperature is compounded, so that the latent heat capacity and the phase change temperature range of the material can be improved, the phase change material is matched with the heat insulation layer and the heat conduction structure after being applied to the temperature control transport case, the phase change material is more suitable for transporting articles with high temperature requirements on vaccines, biological agents and the like, long-term accurate temperature control and low energy consumption can be further realized by combining the PID temperature control module, and compared with the temperature control case of the same type, the phase change material has obvious advantages in temperature control effect and cost control.

Inventors

  • LEI XIANZHANG
  • LAN TIAN
  • XIAO YAN
  • He Kunsong

Assignees

  • 成都相变科技有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (7)

  1. 1. The phase change material is characterized by comprising, by weight, 70-75% of n-tetradecane, 12-16% of polyethylene glycol, 7-10% of nano silicon dioxide, 2-6% of polyurea resin, 0.4-0.6% of dibutyl hydroxy toluene and 0.4-0.6% of melamine; the phase change material is prepared according to the following method: melting n-tetradecane in a constant temperature reaction kettle, then stirring, slowly adding polyethylene glycol, and uniformly stirring to obtain a homogeneous mixed solution; Adding pre-dispersed nano silicon dioxide into the homogeneous mixed solution under the protection of nitrogen, and stirring until the nano silicon dioxide is uniformly dispersed without agglomeration to obtain a capsule mixed solution; Dripping the capsule mixed solution into the aqueous solution of polyurea resin at a fixed speed, and stirring until a microcapsule solution of 35-45 mu m is formed; and adding dibutyl hydroxyl toluene and melamine into the microcapsule solution, uniformly stirring, and then carrying out vacuum drying until residual moisture in the microcapsule solution is removed, thereby obtaining the phase change material.
  2. 2. The phase change material according to claim 1, wherein the nano-silica is pre-dispersed by ultrasound, and the capsule mixed liquid is dropped into the aqueous solution of polyurea resin at a speed of 1.8mL/min.
  3. 3. The phase change material according to claim 1, wherein the phase change material has a phase transition temperature of 5.+ -. 0.2 ℃ and a latent heat 215J/g, and wherein the cycle average latent heat decay is <2.5%.
  4. 4. The temperature control transport case comprises an outer shell and is characterized in that an insulation layer is arranged on the inner wall of the outer shell, a plurality of modularized compartments are arranged in the insulation layer, a magnetic attraction part is arranged between the modularized compartments, and the magnetic attraction part is used for connecting more than two adjacent modularized compartments together; the inner wall of the modularized compartment is also provided with a metal bracket, and the metal bracket is provided with a phase change material module which adopts the phase change material according to any one of claims 1 to 3; And a heat radiating fin is further arranged between the heat insulating layer and the modularized compartment, a circulating micro heat pipe is arranged between the heat radiating fin and the phase change material, a heat conducting medium is filled in the circulating micro heat pipe, a circulating pump is arranged on the circulating micro heat pipe, and the circulating pump is used for enabling the heat conducting medium to circularly flow in the circulating micro heat pipe.
  5. 5. The phase change material of claim 4, wherein the temperature sensor and the humidity sensor are both installed in the modularized compartment, and are connected to a PID temperature control module, and the PID temperature control module is used for controlling the circulating micro heat pipe to adjust the heat absorption and release rate of the phase change material module according to the temperature value and the humidity value acquired by the temperature sensor and the humidity sensor.
  6. 6. The phase change material of claim 5, wherein an ultrasonic humidifier and a molecular sieve dehumidification module are further installed between the heat preservation layer and the modularized compartment, the working ends of the ultrasonic humidifier and the molecular sieve dehumidification module are both arranged in the modularized compartment, the ultrasonic humidifier and the molecular sieve dehumidification module are connected to a PID temperature control module, and the PID temperature control module is further used for controlling the working states of the ultrasonic humidifier and the molecular sieve dehumidification module according to humidity values acquired by a humidity sensor.
  7. 7. The phase change material according to claim 1 or 6, wherein the phase change material module is formed by forming the phase change material according to any one of claims 1 to 3 into a plate-shaped body and then packaging the plate-shaped body in a polyethylene sealing film.

Description

Phase change material and temperature control transport case applied by same Technical Field The invention relates to an application mode of a phase change material, in particular to a phase change material and a temperature control transport case applied by the phase change material. Background With the rapid increase of the cold chain transportation demand of the global medicines, the temperature control transportation box has increasingly prominent effect on the aspects of ensuring the quality and the safety of products. For example, vaccines and biologicals typically require stringent 2-8 ℃ storage conditions, and any temperature deviation may lead to product failure. And deviations exceeding + -0.5 ℃ can increase vaccine failure rates by more than 20%. Conventional temperature controlled transport cases rely primarily on commercial phase change materials or mechanical refrigeration systems, but have significant limitations. Commercial phase change materials are often designed for a wide temperature range, lack of customization for specific transportation scenes, and result in insufficient temperature control accuracy, and particularly poor temperature stability in long-distance transportation, wherein the typical phase change temperature range is + -0.5 ℃ or more, and the latent heat capacity is 150-180J/g. Although the mechanical refrigeration system can realize active control, the mechanical refrigeration system has complex equipment and high energy consumption, is easily influenced by unstable power supply or equipment failure in long-distance transportation, and reduces reliability. In addition, the control system in the prior art is insufficient in intelligent degree, and real-time prediction and dynamic adjustment are difficult to realize, so that energy consumption and temperature control fluctuation are increased. Meanwhile, some researches in recent years have attempted to improve the performance of transport cases by improving commercial phase change materials, such as n-octadecane or brine system based composite materials, but it is still difficult to fully satisfy the complex demands of medical transportation. And the cost of the existing commercial phase change material is high (about 1.0-1.5 yuan/g), and the production process possibly involves non-renewable resources, thereby increasing the operation burden of logistics enterprises. In view of the foregoing, there is a need for developing an efficient, flexible, and precise temperature-controlled transport case. Disclosure of Invention One of the purposes of the invention is to provide a phase change material and a temperature control transport case applied by the phase change material, so as to solve the technical problems that the similar temperature control transport cases in the prior art are limited by the phase change material, the temperature control precision is insufficient, the energy consumption of a mechanical refrigeration system is high and the like. In order to solve the technical problems, the invention adopts the following technical scheme: The invention provides a phase change material which comprises, by weight, 70-75% of n-tetradecane, 12-16% of polyethylene glycol, 7-10% of nano silicon dioxide, 2-6% of polyurea resin, 0.4-0.6% of dibutyl hydroxy toluene and 0.4-0.6% of melamine. The phase change material is prepared by melting n-tetradecane in a constant temperature reaction kettle, stirring, slowly adding polyethylene glycol, stirring uniformly to obtain a homogeneous mixed solution, adding pre-dispersed nano silicon dioxide into the homogeneous mixed solution under the protection of nitrogen, stirring until the nano silicon dioxide is uniformly dispersed and is not agglomerated to obtain a capsule mixed solution, dripping the capsule mixed solution into an aqueous solution of polyurea resin at a fixed speed, stirring until a microcapsule solution of 35-45 mu m is formed, adding dibutyl hydroxy toluene and melamine into the microcapsule solution, stirring uniformly, and then performing vacuum drying until residual moisture in the microcapsule solution is removed to obtain the phase change material. Preferably, the method has the further technical scheme that the nano silicon dioxide is pre-dispersed by ultrasonic, and the speed of dripping the capsule mixed liquid into the aqueous solution of the polyurea resin is 1.8mL/min. The further technical scheme is that the phase change temperature of the phase change material is 5+/-0.2 ℃, the latent heat is 215J/g, and the cycle average latent heat attenuation is less than 2.5%. The invention further provides a temperature control transport case, wherein an insulation layer is arranged on the inner wall of the outer shell, a plurality of modularized compartments are arranged in the insulation layer, a magnetic attraction part is arranged between the modularized compartments, the magnetic attraction part is used for connecting more than two adjacent modularized compartment