Cooling device suitable for human body

Abstract

A cooling device suitable for a human body. The cooling device comprises a phase-change composite material and an outer coating material, wherein the phase-change composite material is packaged inside the outer coating material. During a heat absorption and cooling process, the phase-change composite material is converted into a gel phase from a solid phase. The phase-change composite material mainly comprises a phase-change material and a gelling agent, wherein the phase-change material is an organic phase-change material, and has a phase-change temperature of 2-38°C; and the gelling agent mainly comprises two chain segments: one being a chain segment which is miscible with the phase-change material, and the other one being a chain segment which spontaneously forms physical crosslinking by means of non-covalent bond interaction. The gelling agent and the phase-change material mutually construct a three-dimensional network structure to obtain the phase-change composite material. When filling a cooling device, the phase-change composite material and the gelling agent are firstly heated and melted, then cooled to the phase-change temperature and the gelation temperature or higher, and packaged to obtain the cooling device. The cooling device has the advantages of a short curing time, a long cooling duration, good safety performance, etc.

Description

Cooling device suitable for human body TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling devices, in particular to a cooling device suitable for human body. BACKGROUND

[0002] In summer, the temperature rises and the human body feels uncomfortable. The demand for human body cooling is strong. Cooling spray products use the principle of liquid evaporation to cool down. In addition to water, they also add volatile components such as ethanol, butane and propane. These components are flammable and explosive. Improper storage and use may cause fire and explosion accidents.

[0003] Solid-liquid phase change materials are a relatively mature type of phase change energy storage materials. When the temperature is higher than the phase change temperature of the material, the solid-liquid phase change energy storage material absorbs heat and the phase changes from solid to liquid. When the temperature drops below the phase change temperature, the phase changes from liquid to solid and releases heat. This process is reversible, so the material can be used repeatedly. However, during the phase change process, liquid phase is produced, which has a certain flowability. Therefore, it must be contained in a container, and the container must be sealed and have good barrier properties to prevent leakage, corrosion or pollution of the environment, and the container must be inert relative to the phase change energy storage material. Solid-liquid phase change materials applied to the human body must have certain softness and safety. Therefore, the external container must have softness and good barrier properties.

[0004] JP2021056135 discloses a neck cooling tool that is wrapped around the neck of the human body. It uses PCM (phase change material) to absorb heat and change from solid to liquid to achieve the purpose of cooling the human body. The shell is composed of a high molecular film material with a certain rigidity; the inner material is PCM material that can change from solid to liquid after absorbing heat. During this solid-liquid phase change process, the gravity causes the problem of aggregation of a large amount of solid at the lower end and only a small amount of heat-absorbing solid phase change material at the upper end, which is not conducive to the uniform distribution of the phase change material and causes uneven temperature distribution and poor cooling effect. At the same time, since the PCM used is an organic material, it melts into a liquid after absorbing heat and easily leaks out of the high molecular film material of the shell, polluting the surface of the human body and causing certain risks.

[0005] CN 116849908 A discloses a high-resistance anti-permeation cooling necklace, which comprises a necklace body and a phase change material filled in the necklace body; the necklace body is composed of a high-resistance anti-permeation film in the inner layer and TPU in the outer layer, has the advantages of good anti-permeation of the high-resistance anti-permeation film, and can prevent the phase change material from permeating to the surface of the TPU layer, thereby ensuring the safety of the high-resistance anti-permeation cooling necklace during use. However, the composite material is compounded by using an adhesive, and in the heat sealing process, due to the incompatibility between different materials, the bonding is not firm, which leads to damage and leakage risk.

[0006] By using a gel agent, the liquid organic phase change material can be immobilized or gelled, which can effectively solve the above problems. This crystalline gelation process involves the formation of crystals of the gel agent or the phase change material itself during cooling, and these crystals are connected to each other to form a three-dimensional network structure, thereby locking the phase change material molecules. The gel agent spontaneously forms physical cross-linking through non-covalent bonds (such as hydrogen bonds, van der Waals forces, π-π stacking, molecular chain entanglement, etc.), and then builds a three-dimensional network structure. The gelation process depends on the molecular structure and interaction of the gel agent. The polymer network uses a high molecular polymer as the gel agent, and forms a network structure through physical cross-linking or chemical cross-linking of molecular chains. The oil gel of the polymer network usually has good mechanical strength and stability. The application of this gelled phase change material in a human body cooling device can absorb human body heat through the phase change process of the phase change material, thereby achieving the effect of cooling. On the other hand, the characteristics of the gel phase change material can be utilized to effectively improve the cooling performance of the phase change material, and effectively avoid leakage and other risks.

[0007] SUMMARY

[0008] In view of the deficiencies of the prior art, the purpose of the present application is to provide a cooling device with short curing time, long cooling time and good safety performance.

[0009] The technical scheme adopted by the present application to solve the technical problem is: a cooling device suitable for human body, the cooling device comprising a phase change composite material and an outer coating material; the phase change composite material is encapsulated in the outer coating material; in the heat absorption and cooling process, the phase change composite material is transformed from solid phase to gel phase; the phase change composite material mainly comprises a phase change material and a gelling agent; the phase change material is an organic phase change material, and the phase change temperature is 2-38 DEG C; the gelling agent mainly comprises two kinds of chain segments, one is a chain segment miscible with the phase change material, which improves the compatibility of the organic phase change material; the other is a chain segment spontaneously forming physical cross-linking through non-covalent bond (such as hydrogen bond, van der Waals force, pi-pi stacking, molecular chain entanglement, etc.); the gelling agent and the phase change material are mutually constructed into a three-dimensional network structure to obtain the phase change composite material; when the cooling device is filled, the phase change composite material and the gelling agent are first heated and melted, and then cooled to above the phase change temperature and the gelation temperature, and the cooling device is obtained after encapsulation.

[0010] The phase change composite material is solid when the temperature is below the solidification point of the phase change material, when the temperature of the contact interface is higher than the phase change temperature, the phase change material absorbs heat to cool the contacted object / environment, and maintains the temperature in the phase change temperature range, and the phase change material is transformed at the same time. In the present application, the gelling agent is added to the phase change composite material, so that the phase change material is transformed from solid phase to gel phase (or colloidal phase); after the phase change composite material is completely transformed, it is in gel state or colloidal state. When the cooling device is manufactured, the outer coating material is first made into a bag with a specific shape according to the shape of the mold through hot pressing, ultrasonic wave, high frequency, etc., then the composite phase change material is heated to above the melting temperature and is in a flowing state, and then the composite phase change material is filled into the bag after being cooled to the filling temperature (the filling temperature is higher than the phase change temperature and the gelation temperature), and the bag is sealed, so that the cooling device suitable for different parts of human body can be obtained according to the shape of the bag. Gelatinization (English name: gelatinization; gelation) generally refers to that some solutions become viscous gradually when cooled, and finally lose fluidity and become elastic jelly, the jelly can bear a large pressure, and this phenomenon is called gelatinization phenomenon.

[0011] Further, the organic phase change material is an alkane C n H 2n+2 or a mixture thereof, or an ester compound C m H 2m+1 COOCH3, C m H 2m+1COOC2H5 (wherein m = 11-17) or a mixture thereof; or a mixture of alkanes and ester compounds. Specifically, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, nonadecane, eicosane monomers or a mixture thereof, or methyl laurate (lauryl methyl ester), methyl myristate (myristyl methyl ester), ethyl myristate, methyl palmitate (palmityl methyl ester), ethyl palmitate (palmityl ethyl ester), methyl stearate (stearoyl methyl ester), ethyl stearate (stearoyl ethyl ester) monomers or a mixture thereof.

[0012] Further, the outer layer coating material is a single layer film or a multi-layer composite film, specifically one or more of thermoplastic polyurethane, thermoplastic polyolefin (TPO), polyvinyl chloride, polyethylene, nylon, polyvinylidene chloride, ethylene-vinyl alcohol copolymer (EVOH).

[0013] Further, the gel is a high molecular block copolymer, and the configuration of the block copolymer includes: AB type, ABA type, (AB) x type, or (ABA) x type, wherein x is 2-30; x is preferably 2-15, more preferably 2-6. In the block copolymer, the A segment is a hard segment, and the B segment is a soft segment. The B segment is a long-chain segment polymer arranged in an orderly and regular manner, has good compatibility with the phase change material, and can form a homogeneous solution with the phase change material to fix the phase change material in the polymer network. The A segment has high condensation energy, rigidity, straight main chain, high steric hindrance, etc. as a hard chain, and generally has high strength characteristics at room temperature, providing rigid strength for the three-dimensional network to form a phase change gel.

[0014] Further, the A segment includes at least one of polystyrene, isocyanate, polypropylene, polyisobutylene, polyoctene, and polyamide; and the B segment includes at least one of polybutadiene, polyisoprene, polyethylene, polyether, polyester, hydrogenated polybutadiene, and hydrogenated polyisoprene.

[0015] Preferably, the block copolymer is a styrene-based block copolymer, including styrene-butadiene-styrene block copolymer (SBS), hydrogenated SBS (SEBS), polystyrene-polyisoprene-polystyrene SIS and hydrogenated SIS (SEPS), polyester TPU, polyether TPU, polycarbonate TPU, ethylene-propylene-diene terpolymer (EPDM), and styrene-ethylene-propylene block copolymer.

[0016] Further, the amount of the gel agent is 1% to 10% of the phase change material by mass percentage. When the amount of the gel agent is less than 1%, the concentration of the gel agent is too low to completely bind the phase change material, and the solution has good flowability, and the effect is not obvious. When the amount of the gel agent is more than 10%, on the one hand, the viscosity of the phase change material after being dissolved is large, which is not conducive to production and filling; on the other hand, increasing the amount of the gel agent can reduce the enthalpy of the phase change composite material and shorten the cooling time. The addition of 1% to 10% of the gel agent makes the phase change material not form a flowing liquid but a gel state (semi-solid state) when the temperature is higher than the phase change temperature and lower than the gelation temperature, thereby prolonging the phase change time (cooling time).

[0017] Further, the phase change composite material further comprises a pigment, a high-melting-point wax and a surfactant. The pigment can color the phase change composite material, and the pigment includes a night light powder, an oil-soluble pigment and a color powder. The high-melting-point wax includes a vaseline, a beeswax, a polyethylene wax, a microcrystalline wax, a Fischer-Tropsch wax and a biomass wax, and the amount of the high-melting-point wax is 0.5% to 5% of the phase change material by mass percentage. The high-melting-point wax is generally a macromolecular alkane or ester, and the addition of the high-melting-point wax can improve the gel strength of the phase change composite material. The surfactant is a non-ionic surfactant, and the amount of the surfactant is 0.1% to 1% of the phase change material by mass percentage. The addition of the surfactant can reduce the interfacial tension between the phase change material and the gel agent and between the phase change material and the outer coating material, and improve the compatibility therebetween; and the surfactant can also promote the spontaneous strengthening of the gelation of the phase change composite material.

[0018] Further, when the cooling device is filled, the melting temperature is 80℃ to 100℃, so that the gel agent is completely dissolved in the phase change material to form a transparent and clear solution; the temperature gradually decreases, the regular chain segments in the gel agent interact with each other to form a three-dimensional network structure, the viscosity of the solution rises, and the phase change material is fixed in the gel until the gelation. The filling temperature is 40 to 60℃, and the filling temperature should be higher than the gelation temperature to ensure that the composite phase change material can still flow when filled, but should be lower than the melting temperature; if the temperature is too low, it is not easy to fill into the bag; and if the temperature is too high, it is not conducive to production and operation.

[0019] Further, the cooling device is made into different shapes according to different parts of the human body.

[0020] Further, when the neck is cooled, the film bag is made into a circular arc shape to fit the curve of the neck, and one end has an opening for convenient wearing; when the back is cooled, the film bag is made into a sheet-shaped bag, and the space in the bag can be divided into multiple independent areas; when the head is cooled, the film bag is made into a bowl shape or a circular ring shape.

[0021] The cooling device for the human body has the following advantages compared with the prior art:

[0022] 1) The phase change state is different. The traditional phase change cooling product realizes the cooling function through the phase transition between solid and liquid phases; the present application realizes the phase change by adding a gelling agent to obtain a phase change composite material, and in the solid phase heat absorption-melting process, the solid phase changes into a gel phase (semi-solid state), which is a solid-gel phase phase change. 2) The cooling time is prolonged. The present application uses a solid-gel phase transition phase change material to prolong the cooling time; the existing solid-liquid phase change material rises in temperature to melt when it is in contact with the heat source during the heat absorption-melting process, and the heat conduction to the solid region through the interface is strengthened, which causes the liquid after melting to participate in the flow near the interface, and the flow of high-temperature liquid accelerates the conduction of temperature, so that the solid phase continues to absorb heat and melt continuously; this liquid convection heat transfer mode accelerates the melting of the PCM material. The present application uses a solid-gel phase transition phase change material, and in the heat absorption-melting process, the solid phase changes into a gel phase, and the liquid in the gel phase is limited in the three-dimensional network and cannot occur convection heat transfer, and the temperature conduction from the interface to the solid phase is mainly heat conduction. Since the thermal conductivity of the gel phase is lower than that of the solid, compared with the solid-liquid phase transition material, the cooling time of the solid-gel phase transition material is longer, and the effect of continuous cooling can be achieved.

[0028] 3) The solid phase recovery speed is faster. When the solid phase is completely converted into a gel phase, the product needs to be placed in a condition lower than the crystallization temperature of the phase change material to make the phase change material recrystallize into a solid phase for recycling. Since the phase change material is limited in the three-dimensional network of the gel, the three-dimensional network structure of the gelling agent has an ordered grid, which is a highly ordered organic template, and the compartmentalization effect is obvious, which is beneficial to rapid crystallization. Therefore, the crystallization speed of the solid-gel phase transition material is faster than that of the traditional solid-liquid phase transition material, and the cycle time is shortened. 4) The surfactant can promote the self-enhancement of the phase change gel formation, which may be due to the reduction of the unit surface area and the interfacial tension of the phase change gel system, and the reduction of the interfacial tension leads to a smaller critical nucleation radius and a larger nucleation rate, so that the gelation self-enhancement is enhanced. 5) The leakage risk can be reduced. The outer coating material is sealed by heat sealing to make bags, and there may be poor sealing and a small number of sub-points during the bag making process, and the bags may be damaged during use and transportation. The phase change composite material is in a gel state even in the molten state, and will not leak.

[0029] 6) Reduce the possibility of phase change material from the surface of the outer coating material. Phase change material is an organic solvent, the outer coating material can not be completely blocked, long time will have a small amount from the surface, affect the use of the product. In this invention, because the phase change material is limited in the three-dimensional network formed by the gel, it is difficult to be precipitated, which greatly reduces the proportion of phase change material from the surface of the outer coating material.

[0028] 7) The cooling device made of phase change composite material can reduce the risk of pit. In existing products, due to the difference in density between the solid and liquid phase change materials, there will be volume change during solidification-melting process, which will produce bubbles and cause pits; in this invention, through the solid-gel phase transition, the amount of bubbles produced after phase change cycle is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of the ice neck ring of the neck cooling device in the present application.

[0030] Figure 2 is a structural schematic diagram of the ice pad of the back cooling device in the present application.

[0031] Figure 3 is a structural schematic diagram of the ice cap of the head cooling device in the present application.

[0032] Figure 4 is a cooling curve diagram of the products of examples 2-7 and comparative example 1 in the present application.

[0033] Figure 5 is a solidification temperature curve diagram of the products of examples 2-8 and comparative example 1 in the present application.

[0034] Figure 6 is the flowability of the composite phase change material in examples 5-7 and comparative example 1 under inclined placement.

[0035] Figure 7 is the flowability of the composite phase change material in examples 5-7 and comparative example 1 under inverted placement.

[0036] Figure 8 is the bubble production situation of the ice neck ring prepared in example 6 of the present application after freezing-melting phase change cycle.

[0037] Figure 9 is the bubble production situation of the ice neck ring prepared in comparative example 1 of the present application after freezing-melting phase change cycle.

[0038] Figure 10 is the needle puncture experiment situation of the ice neck ring of the neck cooling device in the present application. DETAILED DESCRIPTION

[0039] The present application will be further described below through specific examples. However, these examples are only used to illustrate the present application and not to limit the scope of the present application.

[0040] Example 1

[0041] According to the weight parts, 100 parts of n-tetradecane is added to a beaker, 5 parts of styrene-butadiene-styrene block copolymer (SBS) is added, slowly heated to above 80°C until completely dissolved, and then reduced to 40-60°C, filled into a film bag to obtain a neck cooling device ice collar, as shown in Figure 1.

[0042] Example 2

[0043] According to the weight parts, 100 parts of n-tetradecane is added to a beaker, 5 parts of styrene-butadiene-styrene block copolymer (SBS) is added, slowly heated to above 80°C until completely dissolved, and then reduced to 40-60°C, filled into a film bag to obtain a neck cooling device ice collar, as shown in Figure 1.

[0044] Example 3

[0045] According to the weight parts, 100 parts of n-tetradecane is added to a beaker, 5 parts of styrene-butadiene-styrene block copolymer (SBS) is added, slowly heated to above 80°C until completely dissolved, and then reduced to 40-60°C, filled into a film bag to obtain a neck cooling device ice collar, as shown in Figure 1.

[0046] Example 4

[0047] According to the weight parts, 100 parts of n-tetradecane is added to a beaker, 5 parts of styrene-butadiene-styrene block copolymer (SBS) is added, slowly heated to above 80°C until completely dissolved, and then reduced to 40-60°C, filled into a film bag to obtain a neck cooling device ice collar, as shown in Figure 1.

[0048] Example 5

[0049] According to the weight parts, 100 parts of n-tetradecane is added to a beaker, 5 parts of styrene-butadiene-styrene block copolymer (SBS) is added, slowly heated to above 80°C until completely dissolved, and then reduced to 40-60°C, filled into a film bag to obtain a neck cooling device ice collar, as shown in Figure 1.

[0050] Example 6

[0051] According to the weight parts, 100 parts of n-tetradecane is added to a beaker, 5 parts of styrene-butadiene-styrene block copolymer (SBS) is added, slowly heated to above 80°C until completely dissolved, and then reduced to 40-60°C, filled into a film bag to obtain a neck cooling device ice collar, as shown in Figure 1.

[0052] Example 7

[0053] According to the weight parts, 100 parts of n-octadecane is added to a beaker, 10 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) is added, slowly heated to 80°C or more until completely dissolved, and then cooled to 40-60°C. It is filled into a film bag to obtain a neck cooling device ice collar.

[0054] Example 8

[0055] According to the weight parts, 100 parts of n-octadecane is added to a beaker, 4 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS), 1 part of vaseline, and 0.2 parts of Tween 80 are added, slowly heated to 80°C or more until completely dissolved, and then cooled to 40-60°C. It is filled into a film bag to obtain a neck cooling device ice collar.

[0056] Example 9

[0057] According to the weight parts, 90 parts of n-octadecane and 10 parts of hexadecane are added to a beaker, 5 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) is added, slowly heated to 80°C or more until completely dissolved, and then cooled to 40-60°C. It is filled into a film bag to obtain a neck cooling device ice collar.

[0058] Example 10

[0059] According to the weight parts, 100 parts of n-octadecane is added to a beaker, 5 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) is added, slowly heated to 80°C or more until completely dissolved, and then cooled to 40-60°C. It is filled into a film bag to obtain a back cooling device ice pad. As shown in Figure 2.

[0060] Example 11

[0061] According to the weight parts, 100 parts of n-octadecane is added to a beaker, 5 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) is added, slowly heated to 80°C or more until completely dissolved, and then cooled to 40-60°C. It is filled into a film bag to obtain a head cooling device ice cap. As shown in Figure 3.

[0062] Example 12

[0063] According to the weight parts, 100 parts of methyl palmitate and 2 parts of beeswax are added to a beaker, 5 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) is added, slowly heated to 80°C or more until completely dissolved, and then cooled to 40-60°C. It is filled into a film bag to obtain a cooling device ice collar.

[0064] Example 13

[0065] In a beaker, 100 parts of ethyl palmitate, 1 part of microcrystalline wax, 0.5 part of lauryl alcohol polyoxyethylene ether were added, 5 parts of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) was added, and the mixture was slowly heated to above 80°C until completely dissolved, then cooled to 40-60°C, and filled into a film bag to obtain a cooling device ice collar.

[0066] Comparative Example 1

[0067] A solution of 105 g of n-octadecane was filled into a film bag to obtain a neck cooling device ice collar.

[0068] Comparative Example 2

[0069] A solution of 105 g of n-octadecane was filled into a film bag to obtain a back cooling device ice pad.

[0070] Comparative Example 3

[0071] A solution of 105 g of n-octadecane was filled into a film bag to obtain a head cooling device ice cap.

[0072] Enthalpy test:

[0073] The phase change composites of Examples 2-13 and Comparative Example 1 were tested by DSC for their enthalpy values, and the results are shown in Tables 1 and 2.

[0074] Cooling performance test: The cooling sample was placed in the refrigerator compartment (0-4°C) to completely solidify, and then placed in a 35°C constant temperature box at the same time. The temperature probe was placed on the surface of the product of the example, and the temperature change was tested until the sample completely phase changed. The cooling performance of the product was characterized by the duration of the sample near the phase change point represented by the temperature curve (as shown in Figure 4), and the test results are shown in Tables 1 and 2.

[0075] Table 1. Enthalpy test results and cooling performance test results of products of Examples 2-7 and Comparative Example 1

[0076] Table 2. Enthalpy test results and cooling performance test results of products of Examples 8-13

[0077] Solidification time test:

[0078] The cooling sample was placed in a 35°C constant temperature box to completely melt, and then placed in the refrigerator compartment (0-4°C) to observe the solidification performance, and at the same time the temperature probe was placed on the surface of the test sample to test the temperature change until the sample completely phase changed. The solidification performance of the product was characterized by the time used by the sample to cool to a temperature below the phase change point, represented by the temperature curve (as shown in Figure 5), and the test results are shown in Table 3.

[0079] Table 3. Curing time test results of products of Examples 2-8 and Comparative Example 1

[0080] Flowability comparison test:

[0081] As shown in Figs. 6 and 7, from left to right are Comparative Example 1, Example 5, Example 6, and Example 7, respectively. Specifically, a small amount of the phase change composites of Examples 5-7 and Comparative Example 1 were placed in two groups of sample bottles, one group was placed obliquely (as shown in Fig. 6), and the other group was placed upside down (as shown in Fig. 7); the flowability of the samples in each sample bottle was observed. As can be seen from Figs. 6 and 7, the octadecane used in Comparative Example 1 has good flowability. The phase change composite prepared in Example 5 has slight flowability at room temperature (about 30°C), and the phase change composites prepared in Examples 6 and 7 are completely in gel state and do not flow even when placed upside down.

[0082] Phase change cycle comparison test:

[0083] After the cooling samples in Example 6 and Comparative Example 1 were completely solidified in the refrigerator (0-4°C), they were simultaneously placed in a 35°C constant-temperature oven, and the bubble generation of each sample after melting was observed. Due to the difference in density between the solid and liquid phases, the volume changes after phase change cycle, resulting in the generation of bubbles. It can be found that the amount of bubbles generated after the freeze-thaw phase change cycle of the ice collar prepared in Example 6 (as shown in Fig. 8) is much smaller than that of Comparative Example 1 (as shown in Fig. 9), avoiding the generation of pits after freezing.

[0084] Needle puncture experiment:

[0085] As shown in Fig. 10, the sample of Example 6 was placed on a universal pressure testing machine, and the state change of the ice collar was observed after being punctured with a needle. The ice collar was punctured with a needle, and the pressure on the universal pressure testing machine was continuously increased. It can be seen that even if the pressure is increased to 210N (equivalent to 21kg weight), only a small amount of internal material is squeezed out. In the natural state without pressure, the gel hardly leaks out.

[0086] The above embodiments are only used to illustrate the present application, but not to limit the present application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and all equivalent technical solutions also belong to the scope of the present application. The patent protection scope of the present application should be defined by the claims.

Claims

1. A cooling device suitable for the human body, characterized in that: The cooling device comprises a phase change composite material and an outer coating material; the phase change composite material is encapsulated in the outer coating material; in the heat absorption and cooling process, the phase change composite material is transformed from a solid phase to a gel phase; the phase change composite material mainly comprises a phase change material and a gel agent; the phase change material is an organic phase change material, and the phase change temperature is 2-38℃; the gel agent mainly comprises two kinds of chain segments, one is a chain segment that is mutually soluble with the phase change material, and the other is a chain segment that is spontaneously formed into a physical crosslinking through non-covalent bond interaction; the gel agent and the phase change material are mutually constructed into a three-dimensional network structure to obtain the phase change composite material; in the filling of the cooling device, the phase change composite material and the gel agent are firstly heated and melted, and then cooled to above the phase change temperature and the gelation temperature, so that the cooling device is obtained after encapsulation.

2. The body cooling device of claim 1, wherein: The organic phase change material is an alkane C with a carbon number n = 14 to 20 n H 2n+2 or a mixture thereof, or an ester compound C with a carbon number m = 11 to 17 m H 2m+1 COOCH3, C m H 2m+1 COOC2H5or a mixture thereof, or a mixture of an alkane and an ester compound.

3. The body cooling device of claim 1, wherein: The outer coating material is a single-layer film or a multi-layer composite film, and specifically one or more of thermoplastic polyurethane, thermoplastic polyolefin, polyvinyl chloride, polyethylene, nylon, polyvinylidene chloride and ethylene-vinyl alcohol copolymer.

4. The body cooling device of claim 1, wherein: The gel is a high molecular weight block copolymer, the configuration of the block copolymer includes: AB type, ABA type, (AB) x type, or (ABA) x type, wherein x is 2-30; in the block copolymer, the A segment is a hard segment, and the B segment is a soft segment.

5. A body cooling device as claimed in claim 4, wherein: The A chain segment comprises at least one of polystyrene, isocyanate, polypropylene, polyisobutylene, polyoctene and polyamide; and the B chain segment comprises at least one of polybutadiene, polyisoprene, polyethylene, polyether, polyester, hydrogenated polybutadiene and hydrogenated polyisoprene.

6. The body cooling device of claim 4, wherein: The block copolymer is a styrene block copolymer, and specifically styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer, polystyrene-polyisoprene-polystyrene and hydrogenated polystyrene-polyisoprene-polystyrene, polyester TPU, polyether TPU, polycarbonate TPU, ternary ethylene-propylene copolymer and styrene-ethylene-propylene block copolymer.

7. The body cooling device of claim 1, wherein: The amount of the gel agent is 1%-10% of the phase change material by mass percentage.

8. The body cooling device of claim 1, wherein: The phase change composite material further comprises pigments, high-melting-point waxes and surfactants.

9. A body cooling device as claimed in claim 8, wherein: The pigments comprise night light powder, oil-soluble pigments and toner; the high-melting-point waxes comprise vaseline, beeswax, polyethylene wax, microcrystalline wax, Fischer-Tropsch wax and biomass wax; the amount of the high-melting-point waxes is 0.5-5% of the phase change material by mass percentage; and the surfactants are non-ionic surfactants, and the amount of the surfactants is 0.1-1% of the phase change material by mass percentage.

10. The body cooling device of claim 1, wherein: In the filling of the cooling device, the melting temperature is 80-100℃, and the filling temperature is 40-60℃.

11. The body cooling device of claim 1, wherein: The cooling device is made into different shapes according to different parts of the human body.

12. The body cooling device of claim 11, wherein: For neck cooling, the film bag is made into a circular arc shape to fit the curve of the neck, and has an opening at one end for convenient wearing; for back cooling, the film bag is made into a sheet-shaped bag, and the space in the bag can be divided into multiple independent areas; and for head cooling, the film bag is made into a bowl shape or a circular ring shape.

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