Preparation method of surface heating material electrode

Abstract

The invention relates to the technical field of conductive composite materials, in particular to a surface heating material electrode preparation method which comprises the steps that the average diameter of conductive particles is determined according to the thickness of a glue film, and the average diameter of the conductive particles is larger than the thickness of the glue film; adding conductive particles in a preset weight ratio into the molten resin, and stirring until the conductive particles and the resin are uniformly mixed to form a resin mixture; molding the cooled resin mixture into an adhesive film by adopting a hot melting method; compounding and pre-pressing the adhesive film and a metal foil to form an adhesive metal foil; and preparing the metal foil with the adhesive into an electrode, compounding and pre-pressing the electrode with the surface heating material, and curing according to the temperature of the adhesive film resin to obtain the surface heating material electrode. The preparation method of the surface heating material electrode aims to solve the problem that an ultrathin and ultra-light surface heating material is difficult to meet the strength requirement of electrode preparation.

Description

Technical Field

[0001] The invention relates to the technical field of conductive composite materials, and in particular to a method for preparing a surface heating material electrode. Background Art

[0002] The surface heating material is a thin layer structure with uniform conductivity, so the electrode of the heating material needs to be prepared on the fabric, and the conductivity needs to be several orders of magnitude higher than that of the electric heating material in order to play the role of current transmission. There are several ways to obtain the conductivity of fabric materials. The first is to use metal wire for sewing and weaving: sew and weave conductive wire materials with better conductivity, such as copper wire, into the existing fabric. When the power is turned on, the current is applied to the conductive wire material and evenly transmitted to all parts of the heating material; the second is to apply high-conductive slurry: apply the slurry with better conductivity to the electrode area, and the conductivity of the electrode area must be much higher than the material itself, so as to realize the function of electrode current transmission; the third is to use the fiber surface metallization method: the fiber surface is metallized in the electrode area, and the metal is adhered to the heating fabric in the form of spraying or plating to form a stable conductive structure.

[0003] Commonly used conductive silver paste has high metal content, poor bonding performance, and poor high temperature stability. Fiber surface metallization has certain requirements for fibers. For metal thermal spraying, the heating material must be able to withstand the impact of spraying. The aerospace field requires ultra-thin and ultra-light materials, and surface heating materials often cannot meet the strength requirements of electrode preparation.

[0004] Therefore, the inventor provides a method for preparing a surface heating material electrode. Summary of the invention

[0005] (1) Technical issues to be solved

[0006] The embodiment of the present invention provides a method for preparing a surface heating material electrode, which solves the technical problem that ultra-thin and ultra-light surface heating materials are difficult to meet the strength requirements for electrode preparation.

[0007] (2) Technical solution

[0008] The present invention provides a method for preparing a surface heating material electrode, comprising the following steps:

[0009] Determining an average diameter of the conductive particles according to the thickness of the adhesive film, wherein the average diameter of the conductive particles is greater than the thickness of the adhesive film;

[0010] Adding the conductive particles in a preset weight ratio into the molten resin, and stirring until the conductive particles and the resin are evenly mixed to form a resin mixture;

[0011] Using a hot melt method to shape the cooled resin mixture into the adhesive film;

[0012] Pre-pressing the adhesive film and metal foil into adhesive-coated metal foil;

[0013] The adhesive-coated metal foil is made into an electrode and then pre-pressed with a surface heating material. After curing according to the temperature of the adhesive film resin, a surface heating material electrode is obtained.

[0014] Furthermore, the conductive particles are any one of metal particles, carbon material particles and metal and carbon material composite particles.

[0015] Furthermore, the conductive particles are metal-coated carbon material particles.

[0016] Furthermore, the resin is any one of a medium temperature curing epoxy resin, a high temperature curing epoxy resin, a cyanate resin, a bismaleimide resin and a polyimide resin.

[0017] Furthermore, the melting temperature of the resin is such that no reaction occurs and the viscosity is less than 1000 Pa·s.

[0018] Furthermore, the thickness of the metal foil is 0.01-0.1 mm.

[0019] Furthermore, the weight ratio of the conductive particles to the resin is 1 to 15%.

[0020] Furthermore, the surface density of the film is 20 to 100 g / m 2 .

[0021] Furthermore, the relationship between the average diameter d of the conductive particles and the thickness l of the adhesive film is 1.05l≤d≤1.5l.

[0022] Furthermore, the surface heating material includes monene fabric, graphene film, carbon nanotube film and other conductive thin layers of fabric.

[0023] (3) Beneficial effects

[0024] In summary, the present invention applies a film containing a small amount of conductive particles to the surface of a metal foil, and then composites and solidifies the metal foil and the surface heating material to obtain a surface heating material electrode. The conductive particles in the film are used to achieve good contact between the metal foil and the surface heating material, thereby having good conductive properties, and the strength requirements of the surface heating material during electrode preparation are reduced by curing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic flow chart of a method for preparing a surface heating material electrode provided by an embodiment of the present invention;

[0027] Figure 2 This is an optical photograph of an electrode of a carbon nanotube film provided by an embodiment of the present invention;

[0028] Figure 3 This is an infrared thermal image of an electrically heated carbon nanotube film provided in Example 1 of the present invention;

[0029] Figure 4 This is an infrared thermal image of an olefin fabric film electrically heated as provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments, and covers any modification, replacement and improvement of parts, components and connection modes without departing from the spirit of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] Figure 1 is a schematic diagram of a method for preparing a surface heating material electrode provided by an embodiment of the present invention, see Figure 1 , the method may include the following steps:

[0033] S100, determining an average diameter of the conductive particles according to the thickness of the adhesive film, wherein the average diameter of the conductive particles is greater than the thickness of the adhesive film.

[0034] Specifically, the conductive particles are any one of metal particles, carbon material particles, and metal and carbon material composite particles. Furthermore, the conductive particles are metal-coated carbon material particles.

[0035] The conductive particles are screened to ensure that their average diameter d is slightly larger than the thickness l of the film containing the conductive particles, so that the conductive particles can pierce the film after compounding to achieve electrical continuity with the surface heating material and surface conductivity. The relationship between the average diameter d of the conductive particles and the thickness l of the film is 1.05l≤d≤1.5l.

[0036] S200, adding conductive particles less than a preset weight ratio into the molten resin, and stirring until the conductive particles and the resin are evenly mixed to form a resin mixture.

[0037] Specifically, the resin is any one of a medium temperature curing epoxy resin, a high temperature curing epoxy resin, a cyanate resin, a bismaleimide resin and a polyimide resin. The melting temperature of the resin is controlled to a level where no reaction occurs and the viscosity is relatively low (viscosity <1000Pa·s), which is specifically adjusted according to different types of resins, wherein the preferred viscosity is <150Pa·s. The conductive particles are added to the resin, stirred at a high speed (stirring speed >200rpm) until the conductive filler and the resin are evenly mixed, and then cooled for use. Furthermore, the weight ratio of the conductive particles to the resin is 1 to 15%.

[0038] S300, forming the cooled resin mixture into an adhesive film by a hot melt method.

[0039] Specifically, the surface density of the film is 20 to 100 g / m 2 .

[0040] S400, pre-pressing the adhesive film and the metal foil into adhesive-coated metal foil.

[0041] Specifically, the thickness of the metal foil is 0.01 to 0.1 mm, and more specifically, the thickness of the metal foil is 0.04 to 0.07 mm.

[0042] S500, after the metal foil with adhesive is made into an electrode, it is pre-pressed with the surface heating material, and after curing according to the temperature of the adhesive film resin, a surface heating material electrode is obtained.

[0043] Specifically, the surface heating material includes monene fabric, graphene film, carbon nanotube film and other conductive thin layers of fabric, and its surface resistance is 5 to 8000Ω / □.

[0044] Example 1

[0045] 1. The conductive particles are carbon material and metal composite particles with an average particle size of 60μm. The resin is medium temperature curing epoxy resin. The mass ratio of the two is 5:100, and they are melted and mixed at 60℃.

[0046] 2. The obtained resin containing conductive particles is coated on the release paper in a film machine by melting method, and the film surface density is 50g / m 2The basic properties of the film are shown in Table 1.

[0047] 3. After compounding the above adhesive film with 0.07 mm thick copper foil, cut it into 5 mm wide adhesive copper foil strips;

[0048] 4. Mix the copper foil strips and carbon nanotube heating film (surface density 1.2 g / m 2 , thickness 0.04mm, surface resistance 5Ω / □) composite, after pre-pressing at 60℃, and curing according to the curing conditions of the resin film, a heating film with electrodes is obtained, such as Figure 2 The contact resistance is measured to be less than 20mΩ.

[0049] 5. When the above heating material is heated by electricity, a good heating effect can be achieved. Its infrared thermal image is as follows: Figure 3 shown.

[0050] Table 1 Properties of adhesive films containing conductive particles

[0051] project Test value <![CDATA[Areal density, g / m 2 > 50 Pull-out strength, MPa 7.4 Tensile shear strength, MPa 12.6

[0052] Example 2

[0053] 1. The conductive particles are carbon material and metal composite particles with an average particle size of 80μm. The resin is medium temperature curing epoxy resin. The mass ratio of the two is 10:100, and they are melted and mixed at 60℃.

[0054] 2. The obtained resin containing conductive particles is coated on the release paper in a film machine by melting method, and the film surface density is 50g / m 2 .

[0055] 3. After compounding the above adhesive film with 0.07 mm thick copper foil, cut it into 5 mm wide adhesive copper foil strips;

[0056] 4. Mix the above film with olefin fabric (surface density 100g / m 2 , thickness 0.1mm) compounded, pre-pressed at 60°C, and cured according to the curing conditions of the resin film to obtain a heating film with electrodes. The contact resistance is measured to be less than 20mΩ.

[0057] 5. When the above heating material is heated by electricity, a good heating effect can be achieved. Its infrared thermal image is as follows: Figure 4 shown.

[0058] It should be clear that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. In addition, for the sake of brevity, a detailed description of known methods and technologies is omitted here.

[0059] The above are only embodiments of the present application and are not limited to the present application. For those skilled in the art, the present application may have various changes and variations without departing from the scope of the present invention. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for preparing a surface heating material electrode, characterized in that: The method comprises the following steps: Determining an average diameter of the conductive particles according to the thickness of the adhesive film, wherein the average diameter of the conductive particles is greater than the thickness of the adhesive film; Adding the conductive particles in a preset weight ratio into the molten resin, and stirring until the conductive particles and the resin are evenly mixed to form a resin mixture; Using a hot melt method to shape the cooled resin mixture into the adhesive film; Pre-pressing the adhesive film and metal foil into adhesive-coated metal foil; The adhesive-coated metal foil is made into an electrode and then pre-pressed with a surface heating material. After curing according to the temperature of the adhesive film resin, a surface heating material electrode is obtained.

2. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The conductive particles are any one of metal particles, carbon material particles, and composite particles of metal and carbon material.

3. The method for preparing a surface heating material electrode according to claim 2, characterized in that: The conductive particles are metal-coated carbon material particles.

4. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The resin is any one of medium temperature curing epoxy resin, high temperature curing epoxy resin, cyanate resin, bismaleimide resin and polyimide resin.

5. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The melting temperature of the resin is such that no reaction occurs and the viscosity is less than 1000 Pa·s.

6. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The thickness of the metal foil is 0.01-0.1 mm.

7. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The weight ratio of the conductive particles to the resin is 1 to 15%.

8. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The surface density of the film is 20 to 100 g / m 2 .

9. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The relationship between the average diameter d of the conductive particles and the thickness l of the adhesive film is 1.05l≤d≤1.5l.

10. The method for preparing a surface heating material electrode according to claim 1, characterized in that: The surface heating material includes monene fabric, graphene film, carbon nanotube film and other conductive thin layers of fabric.

Images