WO2021035649A1

WO2021035649A1 - Resin-type phase change energy storage material and preparation method therefor

Info

Publication number: WO2021035649A1
Application number: PCT/CN2019/103455
Authority: WO
Inventors: 张立强; 张秋兵; 杨小玉
Original assignee: 张立强
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2021-03-04

Abstract

A resin-type phase change energy storage material, comprising: a resin, a phase change powder and a curing agent; the weight ratio of the resin is 5%-30%, the weight ratio of the phase change powder is 30%-90%, and the weight ratio of the curing agent is 5-30%; the phase change enthalpy of the material reaches 30-250 J/g, the specific heat capacity thereof exceeds 2.0 J/(g·K), and the thermal conductivity coefficient thereof reaches 0.5-3.0 (W/mK); thus, the material has a good heat storage effect and good thermal conductivity. The described resin-type phase change energy storage material can be made into a thin film in the form of a 0.1mm-10mm sheet, which can be stacked on other composite thin films having buffering, insulating and like functions, so that same can be applied to electronic control boards and like components.

Description

Resin type phase change energy storage material and preparation method thereof

Technical field

This application relates to the technical field of composite materials, in particular to a resin-based phase change energy storage material and a preparation method thereof.

Background technique

Thermal energy storage technology is used to solve the contradiction between thermal energy supply and demand, and is an important technology to improve energy utilization efficiency and protect the environment. It has good application prospects in the field of solar energy utilization, power "peak-cutting and valley filling", waste heat and waste heat recycling, and energy-saving heating and air-conditioning in industrial and civil buildings. Phase change energy storage is to store the sensible heat of the medium in the phase change material first, so that the phase change material undergoes a phase change, and the obtained energy is stored in the phase change material in the form of latent heat. When energy is needed, the phase change material again Phase change occurs and the stored latent heat is released in the form of sensible heat to complete a heat energy exchange. However, the heat storage effect of many current composite phase change energy storage materials is not ideal, and the thermal conductivity is not high.

Summary of the invention

Based on this, there is an urgent need to provide a resin-based phase change energy storage material and a preparation method thereof to solve the deficiencies of the prior art.

A resin-type phase change energy storage material includes: resin, phase change powder and curing agent, the proportion of the resin is 5% to 30%, and the proportion of phase change powder is 30% to 90%, The proportion of the curing agent is 5%-30%.

Preferably, the resin includes at least one of epoxy resin, polyurethane resin or acrylic resin;

Or, the curing agent includes: at least one of a polyurethane curing agent, a polythiol curing agent or a polycarbonate curing agent,

Preferably, the phase change powder comprises: a modifier and a phase change material, the modifier accounts for 3%-9% of the phase change powder, and the phase change material accounts for the phase change material. The specific gravity of the powder is 91%-97%.

Preferably, the use mode of the phase change material includes at least one of the following:

The phase change material is used through capsule packaging;

The phase change material is used by adsorbing the modifier;

The phase change material is directly used as a raw material for reprocessing.

Preferably, the phase change material includes at least one of paraffin wax, polyethylene wax, polypropylene wax or alkane wax.

A preparation method of resin-type phase change energy storage material includes the following steps,

Preparation of phase change powder;

The resin, curing agent and the phase change powder are used for mixing and smelting to obtain a phase change energy storage material base material; the proportion of the phase change energy storage material includes: the proportion of the resin is 5%-30 %, the proportion of phase change powder is 30% to 90%, and the proportion of curing agent is 5% to 30%;

The phase change energy storage material base material is pressed to obtain a resin-type phase change energy storage material.

Preferably, the preparation of the phase change powder includes heating the phase change material to obtain the phase change material in a molten state;

Stir the phase change material in the molten state, and add the modifier during the stirring process;

Cooling the stirred phase change material to obtain phase change powder with different particles,

The phase change powder of different particles is filtered through a filter screen to obtain a phase change powder of uniform particles.

Preferably, said using resin, curing agent and said phase change powder for mixing and banburying includes: using a vacuum internal mixer to mix and ban the resin, phase change powder and curing agent, and said The atmospheric pressure in the vacuum internal mixer is -0.1MPa～-0.04MPa.

Preferably, the pressing of the phase change energy storage material base material to obtain a resin-type phase change energy storage material includes: calendering the phase change energy storage material base material using a calender molding machine to obtain a sheet-like resin The thickness of the resin-based phase-change energy storage material is 0.1mm-10mm.

Preferably, the calendering machine includes: a composite film reel; the calendering of the phase change energy storage material substrate by using a calendering machine also includes: the composite film reel is used in the calendering machine The output end is a sheet-like resin-type phase change energy storage material with a composite film added.

Compared with the prior art, this application has the following beneficial effects:

The resin-type phase change energy storage material of the present application contains an appropriate amount of phase change powder, the phase change enthalpy reaches 30-250J/g, the specific heat capacity exceeds 2.0J/(g·K), and the thermal conductivity reaches 0.5-3.0(W/mK) ), has better heat storage effect and better thermal conductivity. The preparation process of the resin-type phase change energy storage material of the present application is simple, the production time is short, and the production cost is lower. The resin-based phase change energy storage material of the present application can be made into a 0.1mm-10mm sheet-like film, and can be superimposed with other composite films with buffering, insulation and other functions, so that it can be applied to circuit boards and circuit board components Above, the resin-based phase change energy storage material of the present application can flexibly change the composition ratio to achieve different phase change enthalpy and thermal conductivity, and has a wide range of applications.

Description of the drawings

In order to more clearly describe the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic flow chart of a method for preparing a resin-based phase change energy storage material according to an embodiment of the application;

Fig. 2 is a schematic flow chart of a method for preparing a phase change powder in an embodiment of the application.

detailed description

In order to facilitate the understanding of the application, the application will be described in a more comprehensive manner with reference to the relevant drawings. The preferred embodiments of the application are shown in the accompanying drawings. However, this application can be implemented in many different forms and is not limited to the implementation described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of this application more thorough and comprehensive.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or a central element may also be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only, and are not meant to be the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

In the embodiments of the present application, the resin-based phase change energy storage material in the present application can be widely used in devices such as batteries, electronic circuits, display screens, wearable devices, and home appliances to achieve temperature control effects on these electronic devices. Furthermore, in the latest 5G communication field, 5G communication equipment and 5G smart terminals have stronger requirements for cooling and temperature control. The resin-based phase change energy storage materials in the embodiments of the present application can well meet the requirements.

Embodiment 1, a resin-based phase change energy storage material includes: resin, phase change powder and curing agent, the proportion of the resin is 15%, and the proportion of the phase change powder is 70%, The curing agent accounts for 15%.

Embodiment 2, a resin-based phase change energy storage material includes: resin, phase change powder and curing agent, the proportion of the resin is 12.5%, and the proportion of the phase change powder is 75%, The curing agent accounts for 12.5%.

Embodiment 3, a resin-based phase change energy storage material includes: resin, phase change powder and curing agent, the proportion of the resin is 10%, and the proportion of the phase change powder is 80%, The proportion of the curing agent is 10%.

Embodiment 4, a resin-based phase change energy storage material includes: resin, phase change powder and curing agent, the proportion of the resin is 7.5%, and the proportion of the phase change powder is 85%, The curing agent accounts for 7.5%.

Embodiment 5, a resin-based phase change energy storage material includes: resin, phase change powder and curing agent, the proportion of the resin is 5%, and the proportion of the phase change powder is 90%, The proportion of the curing agent is 5%.

In the examples of this application, the resin-type phase change energy storage materials described in the above examples 1-5 have been tested for performance. The test results of various indicators are shown in Table 1. The test performance at the same ambient temperature is as follows (0.3 mm):

Table 1

According to the data in Table 1, the phase change enthalpy (J/g) of this application is about 30-250, the endothermic value is high, and the heat storage performance is good; the specific heat capacity (J/(g·K)) ≧2.0; the thermal conductivity (W /mK) is 0.5 to 3.0; when the content of the resin and the curing agent remains unchanged, the content of the phase change powder is increased, the phase change enthalpy of the resin-based phase change energy storage material and The thermal conductivity is increased (that is, the phase change performance of the material is better), therefore, the heat storage and heat absorption capacity of the resin-based phase change energy storage material is positively correlated with the content of the phase change powder.

As shown in Table 1, under the condition that the content of the resin and the curing agent remain unchanged, the content of the phase change powder is purely increased. While the phase change enthalpy and thermal conductivity are both increased, the resin type The tensile strength of the phase change energy storage material will be reduced, that is, the flexibility of the material will be reduced, making the plasticity of the material worse. Therefore, in practical applications, the content of phase change powder can be increased as much as possible according to the use scenarios of resin-based phase change energy storage materials to meet the requirements of material flexibility, so that it can obtain better phase change performance.

As shown in Table 1, in Examples 1 to 5, the specific volume of the final resin-based phase change energy storage material did not change significantly under different proportions of the resin, curing agent, and phase change powder. It shows that the proportion range of the examples of this application (that is, the proportion of resin is 5% to 30%, the proportion of phase change powder is 30% to 90%, and the proportion of curing agent is 5% to 30%. Within 30%), resin-based phase-change energy storage materials can achieve better phase-change performance, that is, most of the heat is absorbed by the physical change of the phase-change material, and the temperature of the resin-based phase-change energy storage material body rises. Not big.

In practical applications, exemplarily, the resin and curing agent content of the resin phase change energy storage material is 1:1, which can make the mixed material better form a powder state during the stirring process, which is more conducive to subsequent treatment. Material handling.

In addition, in the examples of the present application, the resin-type phase change energy storage materials described in the foregoing Examples 1-5 were subjected to an aging test, and the test results of various indexes are shown in Table 2 and Table 3:

Table 2

table 3

The aging test conditions in Table 2 and Table 3 are as follows:

Experimental conditions:

1. DSC test temperature range: -20℃～120℃

2. DSC test heating rate: 10℃/min

3. Constant temperature and humidity box setting program, the temperature is set to 85℃, the humidity is set to 85%RH, and the time is 1000H. Laboratory environmental conditions:

1. Temperature: 26±2℃

2. Humidity: 60%±10RH

In order to further illustrate that the resin-based phase change energy storage material of the present application has a relatively stable enthalpy value and thermal conductivity, the resin-based phase change energy storage material described in the foregoing Examples 1-5 was subjected to an aging test, and various index tests were carried out. The results are shown in Table 4 and Table 5:

Table 4

table 5

The aging test conditions in Table 4 and Table 5 are as follows:

Experimental conditions:

1. DSC test temperature range: -20℃～120℃

2. DSC test heating rate: 10℃/min

3. Setting program of thermal shock box, -40℃(heat preservation 10min)*85℃(heat preservation 10min), 1000 cycles

Laboratory environmental conditions:

1. Temperature: 26±2℃

2. Humidity: 60%±10RH

Based on the test data in Tables 2 to 5, it can be seen that the resin-based phase change energy storage material of the present application has an enthalpy decline rate of less than 10% under extreme temperature conditions and after aging, and its thermal conductivity fluctuates less than 10%. %, the resin-based phase change energy storage material of the present application has a relatively stable enthalpy value and thermal conductivity.

In Embodiment 6, the curing agent includes at least one of a polyurethane curing agent, a polythiol curing agent, or a polycarbonate curing agent. In actual applications, according to the different resins (epoxy resin, polyurethane resin or acrylic resin) used, the corresponding curing agent is used for deployment to obtain a better curing effect. For example, acrylic resin with polyurethane curing agent, polyurethane resin with polyurethane curing agent, epoxy resin with polythiol curing agent or polycarbonate curing agent.

Further, the phase change powder may include: a modifier and a phase change material, the modifier accounts for 3%-9% of the phase change powder, and the phase change material accounts for the phase change material. The proportion of the modified powder is 91%-97%.

Exemplarily, the modifier is used to adsorb the phase change material.

Exemplarily, the proportion of the modifier is 3%, and the proportion of the phase change material is 97%; in another requirement, the proportion of the modifier is 9%, and the proportion of the phase change material is 9%. The proportion is 91%.

In practical applications, the modifier is used to adsorb the phase change material. Therefore, the ratio of the modifier to the phase change material can be determined according to the final required volume of the material, which is not specifically limited here.

In Embodiment 7, preferably, the use mode of the phase change material includes at least one of the following:

The phase change material is used through capsule packaging;

The phase change material is used by adsorbing the modifier;

The phase change material is directly used as a raw material for reprocessing.

The phase change material itself has the ability to absorb and release heat and to store heat. In order to facilitate the application of the phase change material or reduce the loss caused by the leakage of the phase change material when the physical state changes, capsules or modifiers are used as the The carrier of the phase change material is used to reduce the loss of the phase change material in application; the phase change material can also be used directly in practical applications, or be reprocessed and used according to actual needs.

Embodiment 8, please refer to Fig. 1, a method for preparing a resin-based phase change energy storage material, including the following steps:

101. Prepare phase change powder;

Wherein, the phase change powder includes: at least one of paraffin wax, polyethylene wax, polypropylene wax or alkane wax. The specific practical phase change material can be determined according to the specific cost and performance requirements, which is not specifically limited here.

102. Use a resin, a curing agent, and the phase change powder to perform mixing and smelting to obtain a phase change energy storage material substrate.

Wherein, the proportion of the phase change energy storage material includes: the proportion of the resin is 5% to 30%, the proportion of the phase change powder is 30% to 90%, and the proportion of the curing agent The proportion is 5% to 30%.

Wherein, a vacuum internal mixer is used to mix and ban the resin, the phase change powder and the curing agent, and the mixing and banquet time is between 20 and 90 minutes, and the air pressure of the vacuum internal mixer is set to -0.1MPa ~-0.04MPa, when the phase change energy storage material base material is stirred, the air in the phase change energy storage material base material can be fully exhausted to avoid the appearance of pores in the phase change energy storage material base material, resulting in The thermal conductivity or heat storage capacity of the phase change heat storage material is reduced.

103. Press the phase change energy storage material substrate to obtain a resin phase change energy storage material.

Wherein, the resin-based phase-change energy storage material has a thickness of 0.1mm-10mm, and the resin-based phase-change energy storage material can be used in a use environment with a small space, and can be flexibly adapted to various devices that require heat dissipation. On the parts.

In Embodiment 9, please refer to Fig. 2. Before preparing the phase change energy storage material powder, it is necessary to prepare the phase change powder first. In practical applications, the phase change material may have physical properties of a solid, such as alkane wax; in this scenario, the processing of phase change heat storage materials has higher requirements, and the embodiments of this application provide corresponding Solutions include:

201. Heating the phase change material to obtain the phase change material in a molten state;

The phase change material is heated at a temperature of 80-100° C. to obtain the phase change material in a molten state, wherein the phase change material includes at least one of paraffin wax, polyethylene wax, polypropylene wax, or alkane wax.

202. Stir the phase change material in the molten state, and add a modifier during the stirring process;

203. Cool the stirred phase change material to obtain phase change powders of different particles;

Wherein, the cooling time can be 1 to 2 hours.

204. Filter phase change powders of different particles through a filter screen to obtain phase change powders of uniform particles.

In the embodiments of the present application, a 10 mesh to 100 mesh filter screen can be used to filter phase change powders of different particles.

In the examples of this application, the solid phase change material is melted, and then the physical properties of the phase change material and the modifier material are configured (for example, a powdered modifier is used to adsorb the phase change material in the molten state, and the phase change material is stirred to make the phase change. The material is fully absorbed by the modifier and becomes a granular phase change powder after cooling), so that under certain performance requirements (reference coefficients such as phase change enthalpy, thermal conductivity, specific heat capacity, etc.), the volume of the molded product is smaller and more Conducive to the shaping of product shape.

In Example 10, in practical application, the resin-based phase change energy storage material is combined with actual application scenarios. It is necessary to calender the resin-based phase change energy storage material into a sheet structure, and then laminate the composite film on the sheet structure. To match the corresponding performance, specifically, including:

After the phase change energy storage material powder, the phase change energy storage material base material is calendered using a calender molding machine to obtain a sheet-shaped resin phase change energy storage material, and the thickness of the resin phase change energy storage material is 0.1mm～10mm.

In addition, the calender molding machine further includes: a composite film reel;

When calendering the phase-change energy storage material substrate by using a calendering machine, the composite film reel can be used to add a composite to the sheet-shaped resin-based phase-change energy storage material on the output end of the calendering machine. membrane. It should be noted that the composite film reel rolls the composite release film on both sides of the sheet-like resin phase change energy storage material, so that it can be attached to the circuit board or the components of the circuit board. The film can have functions such as insulation and buffering, and is used together with the resin-based phase change energy storage material to protect and dissipate the components to be bonded.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express a few embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

A resin type phase change energy storage material, which is characterized by comprising: resin, phase change powder and curing agent;

The proportion of the resin is 5%-30%, the proportion of the phase change powder is 30%-90%, and the proportion of the curing agent is 5%-30%.
The resin-based phase change energy storage material according to claim 1, wherein the resin comprises at least one of epoxy resin, polyurethane resin or acrylic resin;

Or, the curing agent includes at least one of a polyurethane curing agent, a polythiol curing agent, or a polycarbonate curing agent.
The resin-based phase change energy storage material according to claim 1, wherein the phase change powder comprises: a modifier and a phase change material, and the modifier accounts for the total amount of the phase change powder. The proportion is 3%-9%, and the proportion of the phase change material in the phase change powder is 91%-97%.
The resin-based phase change energy storage material according to claim 3, wherein the use mode of the phase change material includes at least one of the following:

The phase change material is used through capsule packaging;

The phase change material is used by adsorbing the modifier;

The phase change material is directly used as a raw material for reprocessing.
The resin phase change energy storage material according to claim 3, wherein the phase change material comprises at least one of paraffin wax, polyethylene wax, polypropylene wax, or alkane wax.
A preparation method of resin-type phase change energy storage material is characterized in that it comprises the following steps:

Preparation of phase change powder;

Use resin, curing agent and the phase change powder to mix and smelt to obtain a phase change energy storage material base material; the proportion of the phase change energy storage material includes: the proportion of the resin is 5%-30 %, the proportion of phase change powder is 30% to 90%, and the proportion of curing agent is 5% to 30%;

The phase change energy storage material base material is pressed to obtain a resin-type phase change energy storage material.
The method for preparing a resin-based phase change energy storage material according to claim 6, wherein the preparing phase change powder comprises;

Heating the phase change material to obtain the phase change material in a molten state;

Stir the phase change material in the molten state, and add the modifier during the stirring process;

Cool the phase change material after stirring to obtain phase change powder of different particles,

The phase change powder of different particles is filtered through a filter screen to obtain a phase change powder of uniform particles.
The method for preparing a resin-based phase change energy storage material according to claim 6, wherein the mixing and smelting of the resin, the curing agent, and the phase change powder comprises:

A vacuum internal mixer is used to mix and ban the resin, phase change powder and curing agent, and the atmospheric pressure in the vacuum internal mixer is -0.1MPa to -0.04MPa.
The method for preparing a resin-based phase-change energy storage material according to claim 6, wherein the pressing of the phase-change energy storage material base material to obtain a resin-based phase-change energy storage material comprises:

A calender molding machine is used to calender the phase change energy storage material substrate to obtain a sheet-shaped resin phase change energy storage material, and the thickness of the resin phase change energy storage material is 0.1 mm-10 mm.
The method for preparing a resin-based phase change energy storage material according to claim 9, wherein the calender molding machine comprises: a laminating reel;

The use of a calendering machine to calender the phase change energy storage material base material further includes:

The composite film is added to the sheet-shaped resin-type phase change energy storage material on the output end of the calender molding machine through the composite film reel.