Method for manufacturing mica board for electric heating equipment

Abstract

The present invention relates to the technical field of mica board manufacturing, and specifically to a method for manufacturing mica boards for electric heating equipment. The mica boards are made by mixing solvent-free organic silicone resin and fine mica flakes, wherein the solvent-free organic silicone resin is in block form. The solvent-free organic silicone resin is used as a binder and the fine mica flakes are used as a substrate. The ratio of the flake area to the flake thickness of the fine mica flakes is ≥20:1. During the manufacturing process, no harmful gas is emitted, which is beneficial to environmental protection and the health of workers. The ratio of the mica flake area to the flake thickness is large, and the flakes are tightly bonded to each other. Therefore, the mica board has high mechanical strength, a complete technical route, a simple process, a high degree of automation, saves labor costs, and is practical.

Description

Technical Field

[0001] The invention relates to the technical field of mica plate manufacturing, in particular to a method for manufacturing a mica plate for electric heating equipment. Background Art

[0002] Mica boards for electric heating equipment made of mica as the base material have excellent properties such as good corrosion resistance, impact resistance, lightning protection, arc protection, high insulation, low temperature resistance (below -60℃), and high temperature resistance. They are widely used in aerospace, aviation, military industry, nuclear power, radar power transmission and distribution systems, lightning protection projects, and high-tech application fields such as submarines, automobiles, shipbuilding, and ultra-high voltage power grids.

[0003] The existing technology for manufacturing mica boards for electric heating equipment is to impregnate mica paper with a thickness of only 0.07 to 0.1 mm with silicone resin, dry it in a dryer, and then cut it into a certain length as required to obtain silicone-containing impregnated paper. Then, according to the thickness requirements of the mica board, a certain number of impregnated papers are stacked together and placed on a partition. This operation is repeated. When the stacking height reaches 8 to 12 cm, another layer is started. Several layers are placed in a hot press for hot pressing. After pressure increase, temperature increase, constant temperature, constant pressure, and gradual cooling, qualified mica boards for electric heating equipment are obtained. Some current mica board manufacturing methods are to crush mica ore to obtain mica powder; dissolve silicone resin, curing agent and moisture-proof agent in an organic solvent, stir evenly, and prepare a silicone resin solution; then mix the mica and silicone resin solution and stir evenly to obtain a mixed slurry, and then dry the mixed slurry to remove the organic solvent and obtain modified mineral powder. Then, the obtained modified mineral powder is added to a mold, evenly distributed, and pressed to obtain a mica board.

[0004] The above manufacturing methods all have obvious shortcomings, mainly:

[0005] 1. In the prior art, a large amount of organic solvents such as methanol, toluene, and xylene are required to dilute the silicone resin during the preparation of the binder. The ratio of organic solvents used in the prior art is 1:2.0-2.2 (i.e., 1 kg of organic solvent can produce 2.0-2.2 kg of mica boards). Production according to the prior art will emit harmful gases. During the mica board manufacturing process, a large amount of organic solvents will be emitted, which will cause serious air pollution around the factory and affect the health of operators and surrounding residents.

[0006] 2: The existing technology has a complex manufacturing process. It often takes dozens of steps from mica ore to mica board. During the pressing process, there are many layers and it is easy to delaminate; the energy utilization rate is low.

[0007] Therefore, we propose a method for manufacturing mica plates for electric heating equipment to solve the above problems. Summary of the Invention

[0008] The present invention aims to provide a method for manufacturing mica boards for electric heating equipment, addressing the demand for mica boards for electric heating equipment in response to the rapid development of modern science and technology, as outlined in the background art. In particular, the present invention aims to overcome the environmental pollution and health hazards posed by the large amounts of harmful gases emitted during the manufacturing process of mica boards for electric heating equipment.

[0009] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions:

[0010] A method for manufacturing mica plates for electric heating equipment comprises mixing a solvent-free silicone resin with fine mica flakes, wherein the solvent-free silicone resin is in block form and the ratio of the flake area to the flake thickness of the fine mica flakes is greater than or equal to 20:1. The method further comprises the following steps:

[0011] Step 1: crushing the block of solvent-free silicone resin to obtain powdered silicone resin;

[0012] Step 2: crushing the mica ore to obtain fine mica flakes;

[0013] Step 3: Mix the powdered silicone resin obtained in step 1 with the fine mica flakes and stir thoroughly to obtain a mixture;

[0014] Step 4: Pour the mixture into the hopper, open the bottom plate of the hopper, and spread the mixture flat on the conveyor belt below the hopper;

[0015] Step 5: The mixed material spread on the conveyor belt will be evenly spread on the conveyor belt under the action of multiple material rollers and rolling rollers, and gradually reach the set thickness;

[0016] Step 6: The formed mica board is heated and cured by an electromagnetic heater on a conveyor belt, and then cut into a certain length according to standard requirements to obtain a mica board for electric heating equipment.

[0017] Preferably, the powdered silicone resin is prepared by a general ball mill, and the particle size should be ≤ 200 mesh.

[0018] Preferably, the fine mica flakes are prepared by special equipment.

[0019] Preferably, the powdered silicone resin accounts for 8 to 12 parts in the mixture, and the fine mica flakes account for 88 to 92 parts. The mica board binder content should meet the requirements of GB / T5022-2002 standard. The powdered silicone resin and fine mica flakes in the mixture are calculated by weight.

[0020] Preferably, the mica board is formed by a forming device.

[0021] Preferably, the mixing and stirring time of the powdered silicone resin and the fine mica flakes is one hour.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention has a complete technical route, simple process, high degree of automation, saves labor costs, and is practical;

[0024] 2. The present invention uses solvent-free silicone resin as a binder and fine mica flakes as a base material. During the manufacturing process, there is zero emission of harmful gases, which is beneficial to environmental protection and the health of workers;

[0025] 3. Since the ratio of the area of ​​mica flakes to the thickness of the flakes is large and the flakes are tightly bonded to each other, the mica board has high mechanical strength.

[0026] 4. The "method for manufacturing mica boards for electric heating equipment" disclosed in the present invention reduces energy consumption by more than 90% because the heat energy of the electromagnetic heater acts directly on the mica board without being transferred through a hot press plate.

[0027] 5. The mica boards manufactured by the present invention have various properties that meet or exceed the requirements of national standards, while the comparative technologies cannot (see Table 1 for performance comparison). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is intended to compare the performance of the present invention;

[0029] Figure 2 It is a schematic diagram of the production process of the present invention.

[0030] In the picture: 1. Powdered silicone resin; 2. Fine mica flakes. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] See also Figure 1-2 As shown in the figure, a technical solution provided by the present invention:

[0034] A method for manufacturing a mica plate for electric heating equipment includes mixing a solvent-free silicone resin with fine mica flakes 2, wherein the solvent-free silicone resin is in block form and the ratio of the flake area to the flake thickness of the fine mica flakes 2 is greater than or equal to 20:1. The method also includes the following steps:

[0035] Step 1: crushing a block of solvent-free silicone resin to obtain a powdered silicone resin 1;

[0036] Step 2: crushing the mica ore to obtain fine mica flakes 2;

[0037] Step 3: Mix the powdered silicone resin 1 obtained in step 1 with the fine mica flakes 2, and stir thoroughly to obtain a mixture;

[0038] Step 4: Pour the mixture into the hopper, open the bottom plate of the hopper, and spread the mixture flat on the conveyor belt below the hopper;

[0039] Step 5: The mixed material spread on the conveyor belt will be evenly spread on the conveyor belt under the action of multiple material rollers and rolling rollers, and gradually reach the set thickness;

[0040] Step 6: The formed mica board is heated and cured by an electromagnetic heater on a conveyor belt, and is cut into a certain length according to standard requirements to obtain a mica board for electric heating equipment.

[0041] Furthermore, the powdered silicone resin 1 is prepared by a general ball mill, and the particle size should be ≤200 mesh, which is convenient for mixing with the fine mica flakes 2, passing through the sieve, and facilitating subsequent processing.

[0042] Furthermore, the fine mica flakes 2 can be prepared, for example, by a dedicated device, which is the device described in patent CN2022225167742, which is incorporated herein by reference.

[0043] Equipment, again I won’t go into too much detail.

[0044] Furthermore, the powdered silicone resin 1 accounts for 8 to 12 parts in the mixture, and the fine mica flakes 2 account for 88 to 92 parts. The mica board binder content should meet the requirements of GB / T5022-2002 standard. The powdered silicone resin and fine mica flakes in the mixture are calculated by weight, which can effectively protect the environment, reduce pollution, and reduce production costs.

[0045] Furthermore, the mica board is formed by a forming device, which can be, for example, the device described in CN2022225163099, which will not be described in detail again.

[0046] Furthermore, the mixing and stirring time of the powdered silicone resin 1 and the fine mica flakes 2 is one hour, which can fully and evenly mix the powdered silicone resin 1 and the fine mica flakes 2 together, and can obtain an efficient mixture, facilitate subsequent processing and molding, and ensure quality.

[0047] Working principle:

[0048] (1) S1, 50 kg of the powdered silicone resin obtained in step 1;

[0049] S2, 450 kg of fine mica flakes obtained in step 2;

[0050] S3, pouring 50 kg of powdered silicone resin and 450 kg of fine mica flakes into a horizontal mixer and stirring for 1 hour to obtain a mixture;

[0051] S4, pouring the mixed material into the hopper;

[0052] S5, setting various technical parameters of the mica board forming device according to the specification requirements of this patent disclosure;

[0053] S6, start the power supply and enter the automatic production program.

[0054] (2) S1, 60 kg of the powdered silicone resin obtained in step 1;

[0055] S2, 440 kg of fine mica flakes obtained in step 2;

[0056] S3, pouring 60 kg of powdered silicone resin and 440 kg of fine mica flakes into a horizontal mixer and stirring for 1 hour to obtain a mixture;

[0057] S4, pouring the mixture into the hopper;

[0058] S5, setting various technical parameters of the mica board forming device according to the specification requirements of this patent disclosure;

[0059] S6, start the power supply and enter the automatic production program.

[0060] The performance comparison between the mica board produced by the method of this embodiment and the mica board produced by the prior art is shown in Table 1.

[0061] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a mica plate for electric heating equipment, comprising mixing a solvent-free silicone resin with fine mica flakes (2), characterized in that: The solvent-free silicone resin is in block form, the ratio of the scale area to the scale thickness of the fine mica flakes (2) is ≥20:1, and the following steps are also included: Step 1: crushing a block of solvent-free silicone resin to obtain a powdered silicone resin (1); Step 2: crushing the mica ore to obtain fine mica flakes (2); Step 3: Mix the powdered silicone resin (1) obtained in step 1 with the fine mica flakes (2), and stir thoroughly to obtain a mixture; Step 4: Pour the mixture into the hopper, open the bottom plate of the hopper, and spread the mixture flat on the conveyor belt below the hopper; Step 5: The mixed material spread on the conveyor belt will be evenly spread on the conveyor belt under the action of multiple material rollers and rolling rollers, and gradually reach the set thickness; Step 6: The formed mica board is heated and cured by an electromagnetic heater on a conveyor belt, and then cut into a certain length to obtain a mica board for electric heating equipment.

2. The method for manufacturing a mica board for electric heating equipment according to claim 1, characterized in that: The powdered silicone resin (1) is prepared by a general ball mill and has a particle size of ≦200 mesh.

3. The method for manufacturing a mica board for electric heating equipment according to claim 1, characterized in that: The fine mica flakes (2) are prepared by special equipment.

4. The method for manufacturing a mica board for electric heating equipment according to claim 1, wherein: The powdered silicone resin (1) accounts for 8 to 12 parts of the mixture, and the fine mica flakes (2) account for 88 to 92 parts. The powdered silicone resin and the fine mica flakes in the mixture are calculated by weight.

5. The method for manufacturing a mica board for electric heating equipment according to claim 1, characterized in that: The mica board is formed by a forming device.

6. The method for manufacturing a mica board for electric heating equipment according to claim 1, characterized in that: The mixing and stirring time of the powdered silicone resin (1) and the fine mica flakes (2) is one hour.

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