A semi-raw semi-green silica gel cloth

Abstract

The utility model relates to the technical field of silica gel composite material, concretely relates to a semi-mature semi-green silica gel cloth, including glass fiber cloth base material layer, mature surface layer and green surface layer, the mature surface layer is the composite layer of vulcanized silica gel and micron grade aluminium powder, and the heat conduction efficiency is remarkably promoted after the treatment of silane coupling agent, the green surface layer is composed of unvulcanized silica gel and PLA degradable release film, and does not need to peel during pressing, the structure solves the problem that the prior art is slow in heat conduction, and the process is complicated, is applicable to heating sheet production, and has good practicality and economy.

Description

Technical Field

[0001] This utility model relates to the field of silicone composite material technology, specifically to a semi-cooked silicone cloth. Background Technology

[0002] Semi-cured silicone cloth is a key substrate in heating element production. Its characteristic of "cured surface (vulcanized layer) providing protection and function, and raw surface (uncured layer) achieving adhesion" makes it a core material for sandwiching heating elements. However, existing semi-cured silicone cloth has the following drawbacks: Insufficient thermal conductivity: The surface layer often uses insulating and thermally conductive powders such as boron nitride and alumina, with a thermal conductivity usually lower than 0.3 W / (m·K), resulting in slow thermal response of the heating element, large surface temperature difference, and affecting heating uniformity; The production process is complex: the release film covering the raw surface layer is mostly made of non-degradable materials such as PET, which the heating element manufacturer needs to peel off before pressing, increasing labor costs and easily damaging the adhesiveness of the raw surface. Therefore, there is an urgent need for a semi-cooked, semi-raw silicone cloth to solve the above problems. Utility Model Content

[0003] In view of this, the purpose of this utility model is to propose a semi-cooked and semi-raw silicone cloth to solve the technical problems of improving the thermal conductivity of the cooked surface layer while ensuring insulation, and eliminating the manual peeling process of the release film of the raw surface layer to improve the production efficiency of the heating element.

[0004] To achieve the above objectives, this utility model provides a semi-cooked and semi-raw silicone cloth, comprising a substrate layer, a cooked surface layer, and a raw surface layer; the cooked surface layer is located on one side of the substrate layer, and the raw surface layer is located on the other side of the substrate layer; The substrate layer is glass fiber cloth; The surface layer is a composite layer of vulcanized silicone and micron-sized aluminum powder; The raw surface layer consists of uncured silicone and a biodegradable release film, with the biodegradable release film adhered to the surface of the uncured silicone.

[0005] Preferably, in the cooked surface layer, the particle size of the micron-sized aluminum powder is 5-10 μm.

[0006] Preferably, in the cooked surface layer, the mass percentage of the micron-sized aluminum powder is 10%-15%.

[0007] Preferably, the vulcanized silicone in the surface layer is methyl vinyl silicone rubber.

[0008] Preferably, the micron-sized aluminum powder in the cooked surface layer is surface-treated with a silane coupling agent, wherein the silane coupling agent is KH-550.

[0009] Preferably, the thickness of the cooked surface layer is 0.1-0.15 mm.

[0010] Preferably, the biodegradable release film in the raw surface layer is a polylactic acid film with a thickness of 0.01-0.02 mm.

[0011] Preferably, the uncured silicone in the raw surface layer and the cured silicone in the cooked surface layer are the same type of base silicone.

[0012] Preferably, the thickness of the substrate layer is 0.1-0.2 mm, the warp and weft density is 100-120 threads / inch, the tensile strength is ≥15 MPa, and the temperature resistance range is -60~200℃.

[0013] The beneficial effects of this utility model are: 1. The surface layer of this utility model uses aluminum powder (thermal conductivity 237W / (m・K)) to replace the traditional insulating powder, and the thermal conductivity is increased to 1.5-2.0W / (m・K).

[0014] 2. Simplified production process: PLA release film automatically degrades during pressing, eliminating the peeling process, and there are no residual impurities that affect the bonding strength. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the degradation process of the release film of this utility model; Figure 3 This is a schematic diagram of the microstructure of the cooked surface layer of this utility model.

[0017] The numbers on the map are: 1-Substrate layer; 2-Cooked surface layer; 3-Uncooked surface layer; 4-Release film; 5-Vulcanized silicone; 6-Aluminum powder. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] This utility model proposes a semi-cooked, semi-raw silicone cloth, such as... Figures 1 to 3 As shown, its structure includes a substrate layer 1, a cooked surface layer 2, and a raw surface layer 3, as detailed below: The substrate layer 1 is made of fiberglass cloth, which serves as the supporting skeleton of the entire structure. It has a thickness of 0.1-0.2mm and a warp and weft density of 100-120 threads / inch to ensure good mechanical strength. With a tensile strength ≥15MPa and a temperature range of -60~200℃, it can adapt to the long-term working environment of the heating element.

[0021] The surface layer 2, located on one side of the substrate layer 1, is a composite layer of vulcanized silicone 5 and micron-sized aluminum powder 6. It is the core layer for achieving thermal conductivity, and its specific features include: The matrix of vulcanized silicone rubber 5 is methyl vinyl silicone rubber, which has stable mechanical properties and temperature resistance after vulcanization. The micron-sized aluminum powder 6 has a particle size of 5-10μm and a mass percentage of 10%-15%. After surface treatment with KH-550 silane coupling agent, it can be tightly bonded to the silica matrix and avoid agglomeration. The overall thickness is 0.1-0.15mm, which ensures the continuity of the heat conduction path without affecting the flexibility of the material. The raw surface layer 3 is located on the other side of the substrate layer 1. It consists of uncured silicone 5 and biodegradable release film 4. It is used for bonding and process adaptation during pressing. The uncured silicone 5 and the curing silicone 5 of the cured surface layer 2 are the same matrix (methyl vinyl silicone rubber). No curing agent is added, and the adhesiveness is retained. The biodegradable release film 4 is a polylactic acid (PLA) film with a thickness of 0.01-0.02 mm. It is bonded to the surface of the uncured silicone 5 and can automatically degrade at 120-150℃ without manual peeling.

[0022] The preparation process can be carried out in the following ways: 1. Pretreatment of substrate layer 1 Unwind the fiberglass cloth (0.15mm thick, 110 warp and weft threads / inch) using an unwinding machine, and then dry it in a hot air drying oven (80°C, 2 minutes) to remove surface moisture. 2. Preparation of cooked dough layer 2 Slurry preparation: Mix methyl vinyl silicone rubber with 12% (by mass) of micron-sized aluminum powder 6 (particle size 8μm), add 0.5% KH-550 silane coupling agent, and disperse evenly through a three-roll mill (gap 50μm) to form aluminum powder 6-silicone slurry; Coating and vulcanization: The slurry is coated on one side of the substrate layer 1 using a doctor blade coater, with a wet film thickness of 0.2 mm (0.12 mm after drying). After being set by hot air drying (100℃, 3 minutes), it is sent to a flat vulcanizing machine (160℃, 5 minutes, pressure 0.5 MPa) for complete vulcanization to form the mature surface layer 2. 3. Preparation of raw surface layer 3 Uncured silicone 5 coating: Methyl vinyl silicone rubber (without vulcanizing agent) is coated on the other side of substrate layer 1, with a wet film thickness of 0.12 mm (0.1 mm after drying), and set by hot air drying (80°C, 2 minutes); Release film 4 lamination: PLA film (thickness 0.015mm) is laminated onto the surface of uncured silicone 5 using a roller laminating machine at a pressure of 0.3MPa and a speed of 15m / min. After winding, it can be cut into specifications such as 300mm×500mm to obtain the finished product.

[0023] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0024] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A semi-cooked, semi-raw silicone cloth, characterized in that, It includes a substrate layer, a cooked surface layer, and a raw surface layer; the cooked surface layer is located on one side of the substrate layer, and the raw surface layer is located on the other side of the substrate layer; The substrate layer is glass fiber cloth; The surface layer is a composite layer of vulcanized silicone and micron-sized aluminum powder; The raw surface layer consists of uncured silicone and a biodegradable release film, with the biodegradable release film adhered to the surface of the uncured silicone.

2. The semi-cooked / semi-raw silicone cloth according to claim 1, characterized in that, In the cooked surface layer, the particle size of the micron-sized aluminum powder is 5-10 μm.

3. The semi-cooked / semi-raw silicone cloth according to claim 1, characterized in that, The vulcanized silicone rubber in the surface layer is methyl vinyl silicone rubber.

4. The semi-cooked / semi-raw silicone cloth according to claim 1, characterized in that, The micron-sized aluminum powder in the cooked surface layer is surface-treated with a silane coupling agent, wherein the silane coupling agent is KH-550.

5. The semi-cooked / semi-raw silicone cloth according to claim 1, characterized in that, The thickness of the cooked surface layer is 0.1-0.15 mm.

6. The semi-cooked / semi-raw silicone cloth according to claim 1, characterized in that, The biodegradable release film in the raw surface layer is a polylactic acid film with a thickness of 0.01-0.02 mm.

7. The semi-cured / semi-raw silicone cloth according to claim 1, characterized in that, The uncured silicone in the raw surface layer and the cured silicone in the cooked surface layer are made of the same base silicone.

8. The semi-cooked / semi-raw silicone cloth according to claim 1, characterized in that, The substrate layer has a thickness of 0.1-0.2 mm, a warp and weft density of 100-120 threads / inch, a tensile strength of ≥15 MPa, and a temperature resistance range of -60~200℃.

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