SMC (Sheet Molding Compound) bearing membrane material

Abstract

The utility model discloses an SMC (Sheet Molding Compound) bearing film material which comprises a core layer and a surface layer, and the core layer is a polyimide film; the surface layer is arranged on at least one side of the core layer in the thickness direction of the core layer, the surface layer comprises a reinforcing layer and a coating layer, the reinforcing layer is arranged on the core layer, the reinforcing layer is made of a glass fiber or carbon fiber material, the coating layer is arranged on the reinforcing layer, and the coating layer is made of a polytetrafluoroethylene material. The SMC sheet bearing membrane material disclosed by the utility model can be kept stable in a high-temperature pressing process, so that the pressing quality and efficiency of the SMC material are ensured. The glass fiber or carbon fiber material is used as the reinforcing layer, so that the mechanical strength and rigidity of the bearing membrane material are greatly improved, the bearing membrane material can better bear the pressure from the SMC material in the pressing process, and the abrasion of a mold is reduced. Due to the addition of the polytetrafluoroethylene coating layer, the bonding performance with the SMC material is improved, and sliding between the materials in the pressing process is avoided, so that the quality of a finished product is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bearing film material, specifically relates to a kind of SMC sheet bearing film material. BACKGROUND

[0002] With the development of modern industry, SMC (Sheet Molding Compound, i.e. sheet molding compound) material is widely used in the fields of automobile, electronics, aerospace and other fields due to its excellent physical and chemical properties. SMC material usually needs to be pressed through a specific mold, and in the pressing process, the traditional method is to directly contact the SMC material with a metal mold, which not only causes mold wear, but also affects the surface quality of the material.

[0003] In order to improve the pressing efficiency and finished product quality of SMC material, the industry begins to use bearing film material as an intermediate layer to protect the mold and SMC material. The existing bearing film material mainly includes polyethylene film, polypropylene film and the like, although these materials can meet the use requirements to some extent, but their carrying capacity, high temperature resistance and adhesion performance with SMC material still need to be improved. SUMMARY

[0004] The utility model aims at at least one of the technical problems in the related art.

[0005] To this end, an embodiment of the utility model provides a kind of SMC sheet bearing film material.

[0006] The SMC sheet bearing film material of the embodiment of the utility model includes core layer and surface layer, the core layer is polyimide film;The surface layer is arranged on at least one side of the core layer in its thickness direction, and the surface layer includes reinforcing layer and coating layer, the reinforcing layer is arranged on the core layer, the reinforcing layer is made of glass fiber or carbon fiber material, and the coating layer is arranged on the reinforcing layer, and the coating layer is made of polytetrafluoroethylene material.

[0007] In some embodiments, the surface layer is arranged on both sides of the core layer in its thickness direction.

[0008] In some embodiments, the reinforcing layer is connected to the core layer and the coating layer by resin adhesive.

[0009] In some embodiments, the coating layer is provided with an anti-adhesive agent.

[0010] In some embodiments, the thickness ratio of the core layer to the surface layer is 0.5-0.6.

[0011] In some embodiments, the thickness of the bearing film material is less than 100 μm.

[0012] In some embodiments, the core layer has a thickness of 20 μm to 50 μm.

[0013] In some embodiments, the coating layer has a thickness of 5 μm-15 μm.

[0014] In some embodiments, the thickness of the reinforcement layer is 10 μm-30 μm.

[0015] The SMC sheet carrier film of the embodiment of the present invention is provided with a polyimide film as the core layer. The polyimide film has excellent high temperature resistance, can remain stable during high temperature pressing, and is not easily deformed or degraded, which ensures the pressing quality and efficiency of the SMC material. By using glass fiber or carbon fiber material as a reinforcing layer, the mechanical strength and rigidity of the carrier film are greatly improved, so that it can better withstand the pressure from the SMC material during the pressing process and reduce the wear of the mold. The addition of a polytetrafluoroethylene coating layer improves the bonding performance with the SMC material and avoids sliding between the materials during the pressing process, thereby ensuring the quality of the finished product. The carrier film as the middle layer effectively avoids direct contact between the SMC material and the metal mold, reduces mold wear caused by friction, and extends the service life of the mold. Due to the use of the carrier film, the SMC material is more comprehensively protected during the pressing process, reducing possible surface defects such as scratches and bubbles, and improving the surface quality of the finished product. This new carrier film is not only suitable for traditional fields such as automobiles, electronics, and aerospace, but can also be expanded to other industries with higher requirements for material properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an SMC sheet supporting a membrane material according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic structural diagram of an SMC sheet supporting a membrane material according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] 100, load-bearing membrane material; 1, core layer; 2, surface layer; 201, reinforcement layer; 202, coating layer. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] like Figure 1 and Figure 2As shown, the SMC sheet bearing film material 100 of the embodiment of the utility model comprises a core layer 1 and a surface layer 2, the core layer 1 is a polyimide film, and the surface layer 2 is arranged on at least one side of the core layer 1 in the thickness direction thereof. The surface layer 2 comprises a reinforcing layer 201 and a coating layer 202, the reinforcing layer 201 is arranged on the core layer 1, the reinforcing layer 201 is made of glass fiber or carbon fiber material, and the coating layer 202 is arranged on the reinforcing layer 201, and the coating layer 202 is made of polytetrafluoroethylene material.

[0022] The SMC sheet bearing film material 100 of the embodiment of the utility model sets the polyimide film as the core layer 1, the polyimide film has excellent high-temperature resistance, can keep stable during high-temperature pressing, is not easy to deform or degrade, which guarantees the pressing quality and efficiency of the SMC material. By using glass fiber or carbon fiber material as the reinforcing layer 201, the mechanical strength and rigidity of the bearing film material 100 are greatly improved, so that the pressure from the SMC material can be better borne during pressing, and the abrasion of the mold is reduced. The addition of the polytetrafluoroethylene coating layer 202 improves the bonding performance with the SMC material, avoids the sliding between materials during pressing, and thus guarantees the quality of the finished product. As the intermediate layer, the bearing film material 100 effectively avoids the direct contact between the SMC material and the metal mold, reduces the abrasion of the mold caused by friction, and prolongs the service life of the mold. Due to the use of the bearing film material 100, the SMC material is more comprehensively protected during pressing, surface defects such as scratches and bubbles are reduced, and the surface quality of the finished product is improved. The novel bearing film material 100 is not only suitable for traditional fields such as automobiles, electronics and aerospace, but also can be extended to other industries with higher requirements for material performance.

[0023] In some embodiments, the surface layer 2 is arranged on both sides of the core layer 1 in the thickness direction thereof.

[0024] As Figure 1 and Figure 2As shown, the design of having coating layers 202 on both sides makes the carrier film 100 more uniform during the pressing process, which can ensure that the SMC material is subjected to the same force on both sides, which is very beneficial to improve the dimensional accuracy and flatness of the final product. Having reinforcing layers 201 and coating layers 202 on both sides means that the carrier film 100 wears more evenly during the pressing process, which helps to extend the service life of the carrier film 100, reduce the replacement frequency and maintenance cost. The arrangement of the coating layers 202 on both sides increases the surface hardness of the carrier film 100, making it have better scratch resistance, which can protect the SMC material from scratching during the pressing process, further improving the appearance quality of the finished product. The polytetrafluoroethylene coating layer 202 has good chemical inertness, and the coating on both sides can better prevent chemical substances from eroding the core layer 1, ensuring the reliability of the carrier film 100 in various environments. The carrier film 100 with a two-sided design is less likely to twist or deform when heated or pressed, which helps to ensure the safety of the operation during the pressing process and reduce safety hazards caused by equipment failure or product defects. The design of having face layers 2 on both sides further improves the overall performance of the carrier film 100, including mechanical strength, thermal stability and durability, thereby better meeting the needs of high-performance application fields.

[0025] In some embodiments, the reinforcing layer 201 is bonded to the core layer 1 and the coating layer 202 by a resin adhesive.

[0026] The use of resin adhesive ensures the firm bonding between the reinforcing layer 201 and the core layer 1, improving the overall strength and stability of the carrier film 100, so that it can withstand greater pressure during the pressing process. Through the action of the adhesive, the adhesion between the reinforcing layer 201 and the coating layer 202 is enhanced, avoiding the problem of interfacial delamination under high temperature or high pressure conditions, thereby improving the reliability of the carrier film 100. The resin adhesive can be selected in different types and formulations according to different needs, so that the combination of the reinforcing layer 201 with the core layer 1 and the coating layer 202 can be optimized, and the adaptability of the carrier film 100 to different types of SMC materials can be improved. The use of resin adhesive can simplify the production process, reduce the processing steps and improve the production efficiency. At the same time, the application of adhesive can be carried out at room temperature, reducing energy consumption and equipment requirements. The selected resin adhesive usually has good thermal stability and can withstand the high temperature generated during the pressing process without causing a decrease in adhesive performance.

[0027] In some embodiments, the coating layer 202 is provided with a release agent.

[0028] The function of the release agent is to reduce the adhesion between the coating layer 202 and the SMC material or other objects, making it easier to separate during pressing and demolding, preventing the material from adhering to the mold. The release agent on the coating layer 202 can significantly reduce the resistance during demolding, improve the demolding efficiency, thereby accelerating the production rhythm and improving the production efficiency. The use of release agent helps to maintain the surface finish and integrity of the SMC material, avoiding surface damage caused by adhesion, improving the surface quality of the finished product. Due to the reduction of direct contact and adhesion between the material and the mold, the release agent helps to reduce the wear of the mold, prolonging the service life of the mold. The release agent usually has certain heat resistance and chemical resistance, which helps to improve the durability of the coating layer 202, enabling it to withstand multiple pressing processes.

[0029] In some embodiments, the ratio of the thickness of the core layer 1 to the thickness of the surface layer 2 is 0.5-0.6.

[0030] The SMC sheet bearing film material 100 of the embodiments of the present application can make the bearing film material 100 have sufficient strength and rigidity while maintaining a certain flexibility, thereby better adapting to different application requirements by adjusting the thickness ratio of the core layer 1 and the surface layer 2. The core layer 1 usually bears the main shear stress, while the surface layer 2 bears the main tensile stress and compressive stress. Proper ratio can ensure that the core layer 1 and the surface layer 2 can maximize their respective functions and improve the overall bearing capacity. The appropriate thickness ratio can enhance the structural stability of the bearing film material 100, making it less likely to deform during pressing, ensuring the quality of the SMC products pressed out.

[0031] In some embodiments, the thickness of the bearing film material 100 is less than 100μm.

[0032] The bearing film material 100 with a thickness of less than 100μm is lighter, which helps to reduce the overall weight of the structure, especially in the fields of aerospace, automobiles and other fields with strict requirements on weight, which can reduce energy consumption and improve energy efficiency. Thinner film means less material usage, which can directly reduce material costs and also reduce transportation and storage costs. Thin bearing film material 100 is easier to handle during processing, which can improve processing speed and shorten production cycle, thereby improving production efficiency. Thinner film usually has better flexibility, which is beneficial to adapt to the shape of the mold in complex pressing process and reduce damage to the material during processing. Thin bearing film material 100 can more easily adapt to different types of SMC materials and different pressing conditions, and has a wider range of applications.

[0033] In some embodiments, the thickness of the core layer 1 is 20μm-50μm.

[0034] For example, the core layer 1 has a thickness of 20 μm, 30 μm, 40 μm or 50 μm. A thinner core layer 1 thickness helps to reduce the overall weight of the carrier film material 100, which is particularly advantageous for applications where weight reduction is pursued (e.g. aerospace, automotive industry). Reducing the core layer 1 thickness means using less material, which can reduce material costs, but also production, transportation and storage costs. A thin core layer 1 makes the carrier film material 100 more flexible overall, allowing it to better adapt to complex mold shapes and pressing processes, reducing damage caused by the application of pressure. A thinner core layer 1 can reduce heat accumulation and conduction, helping to control the temperature during the pressing process, protecting the SMC material from high temperatures.

[0035] In some embodiments, the coating layer 202 has a thickness of 5 μm to 15 μm.

[0036] For example, the coating layer 202 has a thickness of 5 μm, 10 μm or 15 μm. A thinner coating layer 202 thickness helps to achieve more uniform coating during production, reducing performance differences due to uneven thickness. A thinner coating layer 202 can reduce heat transfer, helping to control the temperature of the SMC material during the pressing process, protecting the material from high temperatures. Reducing the thickness of the coating layer 202 means using less material during manufacturing, which can directly reduce production costs. A thinner coating layer 202 is easier to handle during processing, allowing for faster production speeds and increased production efficiency.

[0037] In some embodiments, the reinforcing layer 201 has a thickness of 10 μm to 30 μm.

[0038] For example, the reinforcing layer 201 has a thickness of 10 μm, 20 μm or 30 μm. The main role of the reinforcing layer 201 is to provide additional mechanical strength, and a thickness range of 10 μm to 30 μm can ensure that the carrier film material 100 has sufficient strength and rigidity without adding too much weight and affecting overall flexibility. An appropriate thickness of the reinforcing layer 201 can reduce the amount of material used while maintaining performance, thereby reducing production costs.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", "third", etc. are used herein only to describe various features, and do not imply a relative importance or a specific order of the features. Thus, features defined with "first", "second", "third" can include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An SMC sheet carrier film, characterized by, The core layer is a polyimide film. The face layer is provided on at least one side of the core layer in the thickness direction thereof, and includes a reinforcing layer provided on the core layer and made of a glass fiber or carbon fiber material, and a coating layer provided on the reinforcing layer and made of a polytetrafluoroethylene material. The face layer is provided on both sides of the core layer in the thickness direction thereof.

2. The SMC sheet carrier film of claim 1, wherein, The reinforcing layer is bonded to the core layer and the coating layer by a resin adhesive.

3. The SMC sheet carrier film of claim 1, wherein, The coating layer is provided with an anti-adhesive agent.

4. The SMC sheet carrier film of claim 1, wherein, The thickness ratio of the core layer to the face layer is 0.5-0.

6.

5. The SMC sheet carrier film of claim 1, wherein, The thickness of the load-bearing film material is less than 100 μm.

6. The SMC sheet carrier film of claim 1, wherein, The thickness of the core layer is 20 μm-50 μm.

7. The SMC sheet carrier film of claim 1, wherein, The thickness of the coating layer is 5 μm-15 μm.

8. The SMC sheet carrier film of claim 1, wherein, The thickness of the reinforcing layer is 10 μm-30 μm.

9. The SMC sheet carrier film of claim 1, wherein, ​

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