An aramid plate and a method of making the same

Abstract

The application discloses an aramid plate and a preparation method thereof. A thermosetting resin is arranged between a top aramid cloth and a bottom aramid cloth to composite and connect the top aramid cloth and the bottom aramid cloth. The thermosetting resin composites the top aramid cloth and the bottom aramid cloth into a film to form a composite film unit group. Aramid adhesives are arranged on the surfaces of the top aramid cloth and the bottom aramid cloth on the two sides of each composite film unit group. The top aramid cloth and the bottom aramid cloth are respectively glued to a laminated adhesive sheet in a laminated combination mode through the aramid adhesives. The composite film unit group is composed of the top aramid cloth, the bottom aramid cloth and the thermosetting resin. The laminated structure composed of the aramid adhesives and the laminated adhesive sheet is used to combine multiple composite film unit groups. The aramid plate is gradually composed in a layered mode to ensure the compactness of the aramid plate after being laminated and formed, thereby improving the actual application effect.

Description

Technical Field

[0001] This invention relates to the field of aramid sheet technology, specifically to an aramid sheet and its preparation method. Background Technology

[0002] Aramid is a new type of high-tech synthetic fiber with excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight, insulation, anti-aging, and long life. Due to its special physical and chemical properties, it is widely used in building materials, electronic equipment and composite materials. Aramid mainly appears in the form of aramid cloth and aramid sheet.

[0003] Currently, aramid sheets have low internal bonding capacity, resulting in poor interlayer compactness after molding and a tendency for delamination. Furthermore, in the actual manufacturing process, the inability to effectively apply pressure to the constituent layers of the aramid sheet leads to a loose interlayer structure during the pressing process. Summary of the Invention

[0004] This invention provides an aramid sheet and its preparation method, which can effectively solve the problems mentioned in the background art, such as the low internal bonding ability of current aramid sheets, which leads to poor interlayer compactness after molding and easy delamination, and the inability to effectively apply pressure to the constituent layers of the current aramid sheet during the actual preparation process, resulting in loose interlayer structure during the pressing process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an aramid sheet, which is formed by laminating a top aramid fabric, a bottom aramid fabric, a thermosetting resin, an aramid adhesive, and a laminated film.

[0006] The top aramid fabric and the bottom aramid fabric are arranged in layers, and a thermosetting resin is provided between the top aramid fabric and the bottom aramid fabric to form a composite film. The thermosetting resin combines the top aramid fabric and the bottom aramid fabric into a film, forming a composite film unit group.

[0007] The composite membrane unit group is provided in multiple groups, and the top aramid fabric and bottom aramid fabric on both sides of each composite membrane unit group are provided with aramid adhesive. The top aramid fabric and bottom aramid fabric are bonded to the laminated film by lamination through aramid adhesive.

[0008] According to the technical solution, both the top aramid fabric and the bottom aramid fabric are aramid woven fabrics, and the number of layers of the top aramid fabric and the bottom aramid fabric are the same.

[0009] According to the technical solution, the top aramid fabric, the bottom aramid fabric and the thermosetting resin, as well as the composite film unit group and the laminated film are all laminated and connected by a step-by-step hot pressing method.

[0010] Before the pressing process, the thermosetting resin is impregnated with the top and bottom aramid fabrics to achieve penetration and fusion.

[0011] According to the technical solution, the top aramid fabric, the bottom aramid fabric, and the thermosetting resin are composited into a film structure by hot pressing, and the film structure and the laminated film are formed into a laminate structure by hot pressing.

[0012] According to the technical solution, the laminated film is a polyurethane film, and the thickness of the laminated film is 0.1-0.2 mm.

[0013] A method for preparing an aramid sheet, the method specifically includes the following steps:

[0014] Step 1: Hot-press composite of top aramid fabric, bottom aramid fabric, and thermosetting resin to prepare several sets of composite film unit groups.

[0015] Step 2: Apply the aramid adhesive evenly to the surface of the top and bottom aramid fabrics on both sides of the composite membrane unit assembly.

[0016] Step 3: The multiple composite film unit groups are bonded to the laminated film by hot pressing using aramid adhesive.

[0017] According to the technical solution, in step 1, first select an aramid cloth of appropriate size and specifications to ensure that the size and number of layers of the aramid cloth are the same. After determining the aramid cloth, spread the aramid cloth flat, apply thermosetting resin evenly to the surface of the aramid cloth, and immerse the thermosetting resin into the aramid cloth by impregnation, controlling the impregnation time to be 10-15 minutes.

[0018] After the thermosetting resin is completely impregnated into the aramid fabric, the two aramid fabrics with the thermosetting resin impregnated sides are bonded together and sent into a plate hot press to perform hot pressing treatment on the aramid fabric and thermosetting resin.

[0019] During the hot pressing process of aramid fabric, the applied pressure is controlled at 5-15 MPa and the hot pressing temperature is 100-200℃.

[0020] According to the technical solution, in step 2, after the top layer aramid fabric, the bottom layer aramid fabric, and the thermosetting resin are hot-pressed together to form a composite film unit group, the aramid adhesive is uniformly coated onto the surface of the multiple composite film unit groups.

[0021] The aramid adhesive is an aramid resin system prepared by low-temperature solution polymerization. When the aramid adhesive is coated onto the surface of the composite membrane unit group, it is scraped with a glue spatula to ensure that the aramid adhesive is evenly distributed and of uniform thickness on the surface of the composite membrane unit group.

[0022] According to the technical solution, in step 3, multiple sets of composite film units are laminated. Specifically, during the lamination process, the side of the multiple sets of composite film units coated with aramid adhesive is respectively bonded to the two surfaces of the laminated film, and the multiple sets of composite film units and the laminated film are pressed together by a hot press.

[0023] During the specific pressing process, the pressure applied by the hot press is controlled at 15-35 MPa, and the hot pressing temperature is controlled at 130-220℃.

[0024] According to the technical solution, in steps 1 and 3, when hot pressing the aramid fabric and thermosetting resin, and when hot pressing the composite film unit group and the laminated film, it is necessary to control the applied pressure and hot pressing temperature of the hot press, so that the applied pressure and hot pressing temperature can be gradually increased in a gradient manner, so that the pressure and temperature are positively correlated.

[0025] In step 1, when hot-pressing the aramid fabric and the thermosetting resin, the hot-pressing process is carried out in three stages with gradual increase in pressure and temperature. In the first stage, the pressure is controlled at 5 MPa and the hot-pressing temperature is 100°C. In the second stage, the pressure is controlled at 10 MPa and the hot-pressing temperature is 150°C. In the third stage, the pressure is controlled at 15 MPa and the hot-pressing temperature is 200°C.

[0026] In step 2, during the hot pressing between the composite film unit group and the laminated film, the hot pressing process is carried out in three stages with progressively increasing pressure and temperature. In the first stage, the applied pressure is controlled at 15 MPa and the hot pressing temperature is 130°C. In the second stage, the applied pressure is controlled at 25 MPa and the hot pressing temperature is 180°C. In the third stage, the applied pressure is controlled at 35 MPa and the hot pressing temperature is 220°C.

[0027] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use.

[0028] 1. The composite film unit group is composed of top aramid fabric, bottom aramid fabric and thermosetting resin, and combined with the laminated structure composed of aramid adhesive and laminated film, which facilitates the combination of multiple composite film unit groups. This realizes the gradual assembly of aramid board structure in a layered manner, ensuring the internal tightness of the aramid board after lamination molding, thereby improving its subsequent practical application effect.

[0029] 2. A composite film structure is formed by hot-pressing the top and bottom aramid fabrics together with thermosetting resin. This structure serves as the constituent unit of the aramid fabric. At the same time, aramid adhesive is used as the bonding unit to laminate the constituent units of the aramid fabric with the laminated film, realizing the rapid assembly of aramid sheets. Moreover, this composition structure allows for flexible control of the thickness of the aramid sheet according to the number of constituent units laminated, thus facilitating the flexible preparation of aramid sheets according to requirements.

[0030] Furthermore, by controlling the applied pressure and hot pressing temperature of the hot press, the applied pressure and hot pressing temperature can be gradually increased, so that the pressure and temperature are positively correlated. This ensures that the applied pressure can better act on the interlayer structure of the aramid sheet during the hot pressing process, so that the internal layers can be pressed more tightly, and the phenomenon of delamination of the aramid sheet is avoided in the future. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0032] In the attached diagram:

[0033] Figure 1 This is a schematic diagram of the structural composition of the aramid sheet of the present invention;

[0034] Figure 2 This is a schematic diagram of the composition of the composite membrane unit group of the present invention;

[0035] Figure 3 This is a flowchart of the steps in the aramid sheet preparation method of the present invention;

[0036] The labels in the diagram are: 1. Top layer aramid fabric; 2. Bottom layer aramid fabric; 3. Thermosetting resin; 4. Aramid adhesive; 5. Laminating film. Detailed Implementation

[0037] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0038] Example: Figure 1-2 As shown, the present invention provides a technical solution, an aramid sheet, which is formed by laminating a top aramid fabric 1, a bottom aramid fabric 2, a thermosetting resin 3, an aramid adhesive 4, and a laminated film 5.

[0039] The top layer aramid fabric 1 and the bottom layer aramid fabric 2 are layered and arranged. Both the top layer aramid fabric 1 and the bottom layer aramid fabric 2 are aramid woven fabrics, and the number of layers of the top layer aramid fabric 1 and the bottom layer aramid fabric 2 are the same to ensure neatness and facilitate subsequent hot pressing. The thermosetting resin 3 is arranged between the top layer aramid fabric 1 and the bottom layer aramid fabric 2 to form a composite film unit group. Before the pressing process, the thermosetting resin 3 penetrates and fuses with the top layer aramid fabric 1 and the bottom layer aramid fabric 2 by impregnation, so that the thermosetting resin 3 can better contact with the aramid fabric. The thermosetting resin 3 composites the top layer aramid fabric 1 and the bottom layer aramid fabric 2 into a film.

[0040] Multiple composite film unit groups are provided, and aramid adhesive 4 is provided on the surfaces of the top aramid fabric 1 and the bottom aramid fabric 2 on both sides of each composite film unit group. The top aramid fabric 1 and the bottom aramid fabric 2 are bonded to the laminated film 5 by lamination through the aramid adhesive 4. The laminated film 5 is a polyurethane film with a thickness of 0.15mm to improve its bonding ability during lamination. The top aramid fabric 1, the bottom aramid fabric 2 and the thermosetting resin 3, as well as the composite film unit group and the laminated film 5 are laminated and connected by progressive hot pressing to improve the tightness of the internal interlayer structure of the formed aramid board. The top aramid fabric 1, the bottom aramid fabric 2 and the thermosetting resin 3 are composited into a film structure by hot pressing. The film structure and the laminated film 5 are formed into a laminated board structure by hot pressing, which facilitates the formation of the internal composition structure of the aramid board in a unit group manner.

[0041] like Figure 3 As shown, a method for preparing an aramid sheet includes the following steps:

[0042] Step 1: Hot-press composite of top aramid fabric 1, bottom aramid fabric 2, and thermosetting resin 3 to prepare several sets of composite film unit groups.

[0043] Step 2: Apply aramid adhesive 4 evenly to the surface of the top aramid fabric 1 and the bottom aramid fabric 2 on both sides of the composite film unit group.

[0044] Step 3: The multiple composite film unit groups are bonded together by hot pressing between the aramid adhesive 4 and the laminated film 5.

[0045] Based on the above technical solution, in step 1, first select an aramid cloth of appropriate size and specifications to ensure that the size and number of layers of the aramid cloth are the same. After determining the aramid cloth, spread the aramid cloth flat, apply thermosetting resin 3 evenly on the surface of the aramid cloth, and immerse the thermosetting resin 3 into the aramid cloth by impregnation, controlling the impregnation time to 13 minutes.

[0046] After the thermosetting resin 3 is completely impregnated into the aramid fabric, the two aramid fabrics with the thermosetting resin 3 impregnated sides are bonded together and sent into a plate hot press to perform hot pressing treatment on the aramid fabric and the thermosetting resin 3.

[0047] During the hot pressing process of aramid fabric, the applied pressure is controlled at 10 MPa and the hot pressing temperature is 150℃.

[0048] Based on the above technical solution, in step 2, after the top aramid fabric 1, the bottom aramid fabric 2, and the thermosetting resin 3 are hot-pressed together to form a composite film unit group, the aramid adhesive 4 is uniformly coated onto the surface of the multiple composite film unit groups.

[0049] Aramid adhesive 4 is an aramid resin system prepared by low-temperature solution polymerization. When aramid adhesive 4 is coated onto the surface of the composite membrane unit group, it is scraped with a glue spatula to ensure that the aramid adhesive 4 is evenly distributed and of uniform thickness on the surface of the composite membrane unit group.

[0050] Based on the above technical solution, in step 3, multiple sets of composite film units are laminated. Specifically, during the lamination process, the side of the multiple sets of composite film units coated with aramid adhesive 4 is respectively bonded to the two surfaces of the laminating film 5, and the multiple sets of composite film units and the laminating film 5 are pressed together by a hot press.

[0051] During the specific pressing process, the pressure applied by the hot press is controlled at 25 MPa, and the hot pressing temperature is 180℃.

[0052] Based on the above technical solution, in steps 1 and 3, when hot pressing the aramid fabric and thermosetting resin 3, and when hot pressing the composite film unit group and laminated film 5, it is necessary to control the applied pressure and hot pressing temperature of the hot press, so that the applied pressure and hot pressing temperature can be gradually increased in a gradient manner, so that the pressure and temperature are positively correlated.

[0053] In step 1, when hot pressing between aramid fabric and thermosetting resin 3, the hot pressing process is carried out in three stages with gradual increase in pressure and temperature. In the first stage, the pressure is controlled at 5 MPa and the hot pressing temperature is 100°C. In the second stage, the pressure is controlled at 10 MPa and the hot pressing temperature is 150°C. In the third stage, the pressure is controlled at 15 MPa and the hot pressing temperature is 200°C.

[0054] In step 2, during the hot pressing between the composite film unit group and the laminated film 5, the hot pressing process is carried out in three stages with progressively increasing pressure and temperature. In the first stage, the applied pressure is controlled at 15 MPa and the hot pressing temperature is 130°C. In the second stage, the applied pressure is controlled at 25 MPa and the hot pressing temperature is 180°C. In the third stage, the applied pressure is controlled at 35 MPa and the hot pressing temperature is 220°C.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aramid sheet, characterized in that: The aramid board is formed by laminating a top layer of aramid fabric (1), a bottom layer of aramid fabric (2), a thermosetting resin (3), an aramid adhesive (4), and a laminated film (5); The top aramid fabric (1) and the bottom aramid fabric (2) are arranged in layers, and a thermosetting resin (3) is provided between the top aramid fabric (1) and the bottom aramid fabric (2) to form a composite film. The thermosetting resin (3) combines the top aramid fabric (1) and the bottom aramid fabric (2) into a film to form a composite film unit group. The composite membrane unit group is provided in multiple groups, and the top aramid fabric (1) and bottom aramid fabric (2) on both sides of each composite membrane unit group are provided with aramid adhesive (4), and the top aramid fabric (1) and bottom aramid fabric (2) are bonded to the laminated film (5) by lamination through aramid adhesive (4). The top aramid fabric (1) and the bottom aramid fabric (2) are both aramid woven fabrics, and the number of layers of the top aramid fabric (1) and the bottom aramid fabric (2) are the same. The top aramid fabric (1), the bottom aramid fabric (2) and the thermosetting resin (3), as well as the composite film unit group and the laminated film (5), are all laminated by step-by-step hot pressing. Before the thermosetting resin (3) and the top aramid fabric (1) and the bottom aramid fabric (2) are pressed together, the thermosetting resin (3) is impregnated to penetrate and fuse with the top aramid fabric (1) and the bottom aramid fabric (2). The top aramid fabric (1), the bottom aramid fabric (2) and the thermosetting resin (3) are composited into a film structure by hot pressing. The film structure and the laminated film (5) are formed into a laminate structure by hot pressing. The laminated film (5) is a polyurethane film.

2. The aramid sheet according to claim 1, characterized in that: The thickness of the laminated film (5) is 0.1-0.2 mm.

3. A method for preparing an aramid sheet according to any one of claims 1-2, characterized in that: The preparation method of this aramid sheet specifically includes the following steps: Step 1: Hot-press composite of top aramid fabric (1), bottom aramid fabric (2), and thermosetting resin (3) to prepare several sets of composite film unit groups; Step 2: Apply aramid adhesive (4) evenly to the surface of the top aramid fabric (1) and the bottom aramid fabric (2) on both sides of the composite membrane unit group; Step 3: The multiple composite film units are bonded together by hot pressing between the aramid adhesive (4) and the laminated film (5).

4. The method for preparing an aramid sheet according to claim 3, characterized in that: In step 1, first select an aramid cloth of appropriate size and specifications, and ensure that the size and number of layers of the aramid cloth are the same. After determining the aramid cloth, spread the aramid cloth flat, apply the thermosetting resin (3) evenly on the surface of the aramid cloth, and immerse the thermosetting resin (3) into the aramid cloth by impregnation, and control the impregnation time to 10-15 minutes. After the thermosetting resin (3) is completely immersed in the interior of the aramid fabric, the two aramid fabrics with the thermosetting resin (3) impregnated side are bonded together and sent into a plate hot press. The aramid fabric and the thermosetting resin (3) are hot-pressed by the hot press. During the hot pressing process of aramid fabric, the applied pressure is controlled at 5-15 MPa and the hot pressing temperature is 100-200℃.

5. The method for preparing an aramid sheet according to claim 3, characterized in that: In step 2, after the top aramid fabric (1), the bottom aramid fabric (2), and the thermosetting resin (3) are hot-pressed together to form a composite film unit group, the aramid adhesive (4) is uniformly coated onto the surface of the multiple composite film unit groups. The aramid adhesive (4) is an aramid resin system prepared by low-temperature solution polymerization. When the aramid adhesive (4) is coated onto the surface of the composite membrane unit group, the adhesive is scraped off with a glue spatula to ensure that the aramid adhesive (4) is evenly distributed and of uniform thickness on the surface of the composite membrane unit group.

6. The method for preparing an aramid sheet according to claim 3, characterized in that: In step 3, multiple composite film units are laminated. Specifically, during the lamination process, the side of the multiple composite film units coated with aramid adhesive (4) is respectively bonded to the two surfaces of the laminated film (5), and the multiple composite film units and the laminated film (5) are pressed together by a hot press. During the specific pressing process, the pressure applied by the hot press is controlled at 15-35 MPa, and the hot pressing temperature is controlled at 130-220℃.

7. The method for preparing an aramid sheet according to claim 6, characterized in that: In steps 1 and 3, when hot pressing the aramid fabric and thermosetting resin (3) together, and when hot pressing the composite film unit group and laminated film (5) together, it is necessary to control the pressure and temperature of the hot press so that the pressure and temperature can be gradually increased in a gradient manner, so that the pressure and temperature are positively correlated. In step 1, when hot pressing between aramid fabric and thermosetting resin (3), the hot pressing process is carried out in three stages with gradual pressure and temperature increase. In the first stage, the applied pressure is controlled at 5 MPa and the hot pressing temperature is 100°C. In the second stage, the applied pressure is controlled at 10 MPa and the hot pressing temperature is 150°C. In the third stage, the applied pressure is controlled at 15 MPa and the hot pressing temperature is 200°C. In step 2, when hot pressing between the composite film unit group and the laminated film (5), the hot pressing process is carried out in three stages with gradual pressure and temperature increase. In the first stage, the applied pressure is controlled at 15 MPa and the hot pressing temperature is 130°C. In the second stage, the applied pressure is controlled at 25 MPa and the hot pressing temperature is 180°C. In the third stage, the applied pressure is controlled at 35 MPa and the hot pressing temperature is 220°C.

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