Method for manufacturing fiber resin composite material, method for manufacturing mobile phone case, and mobile phone case

Abstract

Disclosed in the present application are a method for manufacturing a fiber resin composite material, a method for manufacturing a mobile phone case, and a mobile phone case. The manufacturing method comprises: step S10, selecting and using aramid-fiber-woven cloth as a base material, which has a gram weight of 100 g / m2 to 350 g / m2, and stacking N layers of the aramid-fiber-woven cloth; step S20, selecting and using a resin having a Shore hardness of 30 A to 85 D as a compounding layer, and subjecting the compounding layer and the base material to full pre-impregnation or half pre-impregnation, so as to obtain a semi-finished composite fiber resin material; step S30, placing the semi-finished composite fiber resin material into a hot-pressing device for hot pressing, so as to enable the resin to permeate into gaps in the aramid-fiber-woven cloth, wherein the hot pressing is performed at a temperature of 150°C to 250°C and a pressure of 40 bar to 55 bar for 2 min to 10 min; and step S40, stopping the heating of the semi-finished composite fiber resin material after same is hot-pressed by the hot-pressing device for a preset hot-pressing duration, so as to obtain a finished composite fiber resin material. A mobile phone case made of the composite fiber resin material can completely cover the side edges of a mobile phone case.

Description

Method for manufacturing fiber-resin composite material, method for manufacturing mobile phone case, and mobile phone case Technical Field

[0001] The present application relates to the technical field of mobile phone cases, and in particular to a method for manufacturing a fiber resin composite material, a method for manufacturing a mobile phone case, and a mobile phone case. Background Art

[0002] Aramid phone cases are made from aramid fiber-resin composite materials, offering excellent wear and impact resistance. Conventional aramid fiber-resin composites utilize high-hardness resins, such as thermosetting epoxy resins. After pre-impregnation and curing, these high-hardness resins possess a certain rigidity and resist bending or folding. However, using these aramid fiber-resin composites to create fully hemmed phone cases can make assembly and disassembly difficult for users, necessitating a solution. Technical issues

[0003] The main purpose of this application is to propose a method for manufacturing a fiber resin composite material, which aims to solve the problem in the prior art that the materials used to manufacture mobile phone cases are too hard or too soft, which leads to inconvenient disassembly and assembly of the mobile phone or loose covering. Technical Solutions

[0004] To achieve the above objectives, the present application proposes a method for manufacturing a fiber resin composite material, comprising the following steps:

[0005] Step S10: Select aramid fiber woven fabric as the base material, the aramid fiber woven fabric has a gram weight of 100g / m 2 -350g / m 2 , the number of layers of the aramid fiber woven fabric is N, where N is a positive integer greater than or equal to 1;

[0006] Step S20: selecting a resin with a Shore hardness between 30A and 85D as a composite layer, and fully pre-impregnating or semi-pre-impregnating the composite layer and the substrate to obtain a semi-finished fiber-resin composite material;

[0007] Step 30: The fiber-resin composite semi-finished product is placed in a hot pressing device for hot pressing, so that the resin penetrates into the gaps of the aramid fiber woven fabric. The hot pressing temperature of the hot pressing device is 150° C. to 250° C., the pressure is 40 bar to 55 bar, and the pressing time is 2 min to 10 min.

[0008] Step 40: After the hot pressing time of the fiber resin composite material semi-finished product by the hot pressing equipment reaches a preset hot pressing time, the heating of the fiber resin composite material semi-finished product is stopped to obtain a fiber resin composite material finished product.

[0009] In some embodiments of the present invention, the value of N is negatively correlated with the grammage of the aramid fiber woven fabric, wherein 1≤N≤5.

[0010] In some embodiments of the present invention, the aramid fiber woven fabric has a gram weight of 300±50g / m 2 , the laminated layer of the aramid fiber woven fabric is 1-3 layers, and the composite layer is a resin with a Shore hardness of 80A-50D; or,

[0011] The aramid fiber woven fabric has a gram weight of 150±15g / m 2 The aramid fiber woven fabric has 3 to 5 layers, and the composite layer is a resin with a Shore hardness of 90A to 65D.

[0012] In some embodiments of the present invention, the composite layer is made of a resin with a Shore hardness of 80A-80D, and the thickness of a single layer of the finished fiber-resin composite material is 0.15 mm-1 mm.

[0013] In some embodiments of the present invention, when semi-immersion is used, step S20 includes:

[0014] Step S21: selecting a resin with a Shore hardness between 30A and 85D as a composite layer, and superimposing the composite layer on the aramid fiber woven fabric;

[0015] Step S22: semi-prepregging the stacked composite layer and the aramid fiber woven fabric through hot pressing rollers to obtain a fiber resin composite semi-finished product;

[0016] When full infiltration is adopted, step S20 includes:

[0017] Step S21': selecting a resin with a Shore hardness between 30A and 85D as a composite layer, melting the composite layer and placing it in a prepreg device;

[0018] Step S22': placing the aramid fiber woven fabric in the prepreg equipment for full prepreg to obtain a fiber resin composite material semi-finished product.

[0019] In some embodiments of the present invention, the hot pressing temperature, the pressure and the duration of the hot pressing are all positively correlated with the hardness of the fiber-resin composite material.

[0020] The present invention also provides a method for manufacturing a mobile phone case, comprising the following steps:

[0021] Step S100: selecting a fiber-resin composite material as a first sheet material, wherein the fiber-resin composite material is manufactured by the method for manufacturing a fiber-resin composite material according to any one of claims 1 to 5;

[0022] Step 200: Cutting the first sheet to obtain a preset sheet of a preset size and a preset shape, wherein the preset sheet includes a middle area and an edge area surrounding the middle area;

[0023] Step 300: Select a semi-cured material or a cured material as the second sheet material, adhere the second sheet material to the middle area of ​​the preset sheet material, and place the second sheet material on the mobile phone case model together with the preset sheet material;

[0024] Step 400: performing secondary molding on the second sheet and the preset sheet through a molding process, wherein the secondary molding temperature is 160° C. to 200° C., the pressure is 40 bar, and the duration is 5 min to 15 min;

[0025] Step S500: After the second sheet material and the preset sheet material are subjected to secondary molding for a predetermined time, the second sheet material and the preset sheet material are cooled to room temperature to obtain a finished mobile phone case.

[0026] In some embodiments of the present invention, the second sheet material is formed of a semi-cured material, and the second sheet material is a fiberglass board; or

[0027] The second sheet material is formed of a solidified material, and the second sheet material is a carbon fiber plate, a stainless steel plate, or a PC plate.

[0028] The present invention also proposes a mobile phone case, which includes a main body made of a fiber resin composite material and a reinforcement part made of a semi-cured material or a cured material. The main body includes a load-bearing area that fits the back of the mobile phone and a covering area that covers the side of the mobile phone. The reinforcement part is arranged in the load-bearing area; the fiber resin composite material includes an aramid fiber woven fabric layer and a resin composite layer, the aramid fiber woven fabric layer includes 1-5 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer is 100g / m 2 -350g / m 2 The Shore hardness of the resin composite layer is 80A-80D.

[0029] In some embodiments of the present invention, the aramid fiber woven fabric layer includes 1-3 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer is 300±50g / m 2 , the Shore hardness of the resin composite layer is 80A-50D; or,

[0030] The aramid fiber woven fabric layer includes 3-5 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer is 150±15g / m 2 The Shore hardness of the resin composite layer is 90A-65D.

[0031] In some embodiments of the present invention, the resin composite layer is TPE resin or TPU resin; the reinforcement portion is formed of a semi-cured material, and the semi-cured material is a glass fiber board; or,

[0032] The reinforcement part is formed of a solidified material, and the solidified material is a carbon fiber plate, a stainless steel plate, or a PC plate. Beneficial effects

[0033] The manufacturing method of the fiber resin composite material of the present invention is to select a gram weight of 100g / m 2 -350g / m 2 Aramid fiber woven fabric is used as the base material, and resin with a Shore hardness between 30A and 85D is selected as the composite layer. The base material and the composite layer are fully pre-impregnated or semi-pre-impregnated to form a fiber resin composite material semi-finished product. The fiber resin composite material semi-finished product is then hot-pressed and cooled in a hot pressing device to form a fiber resin composite material. The fiber resin composite material manufactured by this method has good strength and softness. The bottom plate and four side plates of the mobile phone case manufactured with the fiber resin composite material can be made into an integrated full-edge style, so that the four sides of the mobile phone can be fully covered. At the same time, the fiber resin composite material also has a certain flexibility, which is convenient for the installation and disassembly of the mobile phone. In addition, the fiber resin composite material also has a certain wear resistance, which also ensures the service life of the mobile phone case. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] FIG1 is a flow chart showing the steps of an embodiment of a method for manufacturing a fiber-resin composite material according to the present invention;

[0036] FIG2 is a flowchart of an embodiment of step S20 in FIG1 ;

[0037] FIG3 is a flowchart of another embodiment of step S20 in FIG1 ;

[0038] FIG4 is a flowchart of the steps of an embodiment of a method for manufacturing a mobile phone case according to the present invention;

[0039] FIG5 is a cross-sectional view of an embodiment of a mobile phone case according to the present invention;

[0040] FIG6 is a schematic structural diagram of the main body of the mobile phone case in FIG5 ;

[0041] FIG7 is a partial cross-sectional view of an embodiment of the main body of FIG6;

[0042] FIG8 is a partial cross-sectional view of another embodiment of the main body in FIG6 .

[0043] Description of Figure Numbers:

[0044] Reference number name Reference number name 100 mobile phone case 111 aramid fiber woven fabric layer 110 main body 112 resin composite layer 110a load-bearing area 113 TPU resin composite layer 110b covering area 120 reinforcement part

[0045] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. Modes for Carrying Out the Invention

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] Referring to FIG. 1 , the present invention provides a method for manufacturing a fiber-resin composite material, comprising the following steps:

[0048] Step S10: Select aramid fiber woven fabric as the base material, the aramid fiber woven fabric has a gram weight of 100g / m 2 -350g / m 2 The number of layers of the aramid fiber woven fabric is N, where N is a positive integer greater than or equal to 1.

[0049] Aramid fiber woven fabric is woven from aramid fiber, which is a new high-tech synthetic fiber. Aramid fiber has excellent properties such as ultra-high strength, light weight, insulation, and anti-aging. This makes aramid fiber woven fabric also have excellent properties such as ultra-high strength, light weight, insulation, and anti-aging.

[0050] The gram weight of aramid fiber woven fabric is usually selected at 100g / m 2 -350g / m 2 , that is, the gram weight of aramid fiber woven fabric can be 100g / m 2 , 120g / m 2 , 140g / m 2, 160g / m 2 , 180g / m 2 , 200g / m 2 , 220g / m 2 , 240g / m 2 , 260g / m 2 , 280g / m 2 , 300g / m 2 , 320g / m 2 , 340g / m 2 , 350g / m 2 As well as other values, the weight of the aramid fiber woven fabric can be selected according to the weight of the mobile phone case.

[0051] The number of layers of the aramid fiber woven fabric N is a positive integer greater than or equal to 1, that is, the number of layers of the aramid fiber woven fabric can be 1 layer, 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, etc. The total weight of the aramid fiber woven fabric is proportional to the number of layers. In this way, when selecting the number of layers of the aramid fiber woven fabric, you can also choose based on the weight and strength of the mobile phone case.

[0052] It is worth noting that since the gram weight of the aramid fiber woven fabric and the stacking of the aramid fiber woven fabric are not fixed, the weight of the base material can be adjusted by adjusting the gram weight of the aramid fiber woven fabric and the stacking of the aramid fiber woven fabric, so that an adaptive choice can be made based on the thickness and weight of the mobile phone case.

[0053] Step S20: Selecting a resin with a Shore hardness between 30A and 85D as a composite layer, and fully pre-impregnating or semi-pre-impregnating the composite layer and the substrate to obtain a semi-finished fiber-resin composite material.

[0054] There are many types of resins with a Shore hardness between 30A and 85D, such as TPU resin (thermoplastic polyurethane elastomer) and TPE resin (thermoplastic elastomer). Resin and aramid fiber woven fabric can be fully pre-impregnated, resulting in a fiber-resin composite material with a relatively high hardness. Resin and aramid fiber woven fabric can be semi-pre-impregnated, resulting in a fiber-resin composite material with a relatively soft hardness.

[0055] In addition, the degree of infiltration of the resin and the aramid fiber woven fabric is also related to the temperature, pressure, and duration of the infiltration. Specifically, the degree of infiltration of the resin and the aramid fiber woven fabric is positively correlated with the temperature, pressure, and duration. In this way, the degree of infiltration of the resin and the aramid fiber woven fabric can be adjusted by adjusting the temperature, pressure, and duration of the infiltration of the resin and the aramid fiber woven fabric, thereby facilitating the adjustment of the hardness of the fiber-resin composite material.

[0056] In other words, the hardness of the fiber-resin composite material can be adjusted not only by selecting the method of compounding the resin and the aramid fiber woven fabric, but also by the temperature, pressure, and duration of the compounding of the resin and the aramid fiber woven fabric. In this way, a fiber-resin composite material of corresponding hardness can be obtained by adjusting the process and parameters of compounding the resin and the aramid fiber woven fabric.

[0057] Step 30: Place the fiber resin composite semi-finished product in a hot pressing device for hot pressing so that the resin penetrates into the gaps of the aramid fiber woven fabric, wherein the hot pressing temperature of the hot pressing device is 150°C-250°C, the pressure is 40bar-55bar, and the pressing time is 2min-10min.

[0058] The hot pressing equipment can be a vacuum autoclave, a flat-plate hot press, etc., and is used to hot-press the fiber-resin composite semi-finished product. The hot pressing equipment can heat the fiber-resin composite semi-finished product to 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, or other temperatures. The hot pressing equipment can also apply pressures of 40 bar, 42 bar, 44 bar, 46 bar, 48 bar, 50 bar, 52 bar, 54 bar, 55 bar, or other pressures to the fiber-resin composite semi-finished product. The hot pressing time for hot-pressing the fiber-resin composite can be 2 minutes, 3 minutes, 5 minutes, 8 minutes, 10 minutes, or other times.

[0059] It is worth noting that the hot pressing temperature, hot pressing pressure, and hot pressing duration of the hot pressing equipment used to hot-press the hot fiber-resin composite semi-finished product all affect the degree of impregnation of the resin and the aramid fiber woven fabric in the fiber-resin composite semi-finished product. Specifically, within the scope of application of the present invention, the degree of impregnation of the resin and the aramid fiber woven fabric in the fiber-resin composite semi-finished product is positively correlated with the hot pressing temperature, hot pressing pressure, and hot pressing duration of the hot pressing equipment. Thus, by adjusting the hot pressing temperature, hot pressing pressure, and hot pressing duration of the hot pressing equipment, a fiber-resin composite semi-finished product with a relatively appropriate degree of impregnation can be obtained, thereby obtaining a fiber-resin composite material with an appropriate hardness. For the present invention, since the control range of temperature and pressure mainly falls within the rated operating range of a flat-plate hot press, a flat-plate hot press is preferably used to achieve more precise temperature, pressure, and time control, thereby improving the quality of the finished product.

[0060] Step 40: After the hot pressing time of the fiber resin composite material semi-finished product by the hot pressing equipment reaches a preset hot pressing time, the heating of the fiber resin composite material semi-finished product is stopped to obtain a fiber resin composite material finished product.

[0061] The hot pressing equipment stops heating the fiber resin composite material semi-finished product after the preset hot pressing time is reached. The fiber resin composite material semi-finished product hot pressed by the hot pressing equipment can be cooled to room temperature by natural cooling. This method takes a certain amount of time. Of course, the fiber resin composite material semi-finished product hot pressed by the hot pressing equipment can also be cooled to room temperature by water cooling or machine temperature control. The cooling method can be gradient change, curve change, or linear change. When the hot pressed fiber resin composite material semi-finished product is cooled to room temperature, it becomes a fiber resin composite material finished product material.

[0062] The manufacturing method of the fiber resin composite material of the present invention is to select a gram weight of 100g / m 2 -350g / m 2 Aramid fiber woven fabric is used as the base material, and resin with a Shore hardness between 30A and 85D is selected as the composite layer. The base material and the composite layer are fully pre-impregnated or semi-pre-impregnated to form a fiber resin composite material semi-finished product. The fiber resin composite material semi-finished product is then hot-pressed and cooled in a hot pressing device to form a fiber resin composite material. The fiber resin composite material manufactured by this method has good strength and softness. The bottom plate and four side panels of the mobile phone case made of the fiber resin composite material are integrated, and the four side panels of the mobile phone case are of the same height, so that the four sides of the mobile phone can be fully covered. At the same time, the fiber resin composite material also has a certain flexibility, which facilitates the installation and disassembly of the mobile phone. In addition, the fiber resin composite material also has a certain wear resistance, which also ensures the service life of the mobile phone case.

[0063] It's worth noting that phone cases generally shouldn't be too heavy. Therefore, when selecting aramid fiber fabric, the weight and number of layers of the fabric need to be considered. In some embodiments of the present invention, the weight of the fabric is negatively correlated with the number of layers, i.e., the value of N is negatively correlated with the weight of the fabric, where 1 ≤ N ≤ 5. This avoids the problem of selecting a heavier aramid fiber fabric and simultaneously increasing the number of layers, which could lead to an excessively heavy phone case.

[0064] In some embodiments of the present invention, the aramid fiber woven fabric has a gram weight of 300±50 g / m 2 The weight of aramid fiber woven fabric is 250g / m 2 -350g / m 2The aramid fiber woven fabric may be laminated in 1-3 layers, i.e., the aramid fiber woven fabric may be laminated in 1, 2, or 3 layers; and the composite layer may be a resin having a Shore hardness of 80A-50D. This arrangement, due to the relatively hard composite layer, allows the thickness of the fiber-resin composite material to be reduced by reducing the number of aramid fiber woven fabric layers, thereby enabling the phone case to be made thinner while still maintaining good wrapping properties.

[0065] In some embodiments of the present invention, the aramid fiber woven fabric has a gram weight of 150±15 g / m 2 The aramid fiber woven fabric has a gram weight of 135g / m 2 -165g / m 2 The aramid fiber woven fabric can be stacked in 3-5 layers, i.e., the aramid fiber woven fabric can be stacked in 3, 4, or 5 layers; the composite layer is a resin with a Shore hardness of 90A-65D. With this arrangement, since the composite layer is relatively soft, the thickness of the entire fiber-resin composite material can be increased by increasing the number of aramid fiber woven fabric layers, thus achieving a moderate hardness of the fiber-resin composite material, thereby ensuring that the phone case has moderate hardness while also having good covering properties.

[0066] It should be noted that if the hardness of the resin selected for the composite layer is too low, the number of layers of the aramid fiber woven fabric used for the base material needs to be set in multiple layers, which will result in a relatively thick fiber-resin composite material. In view of this, in some embodiments of the present invention, the composite layer uses a resin with a Shore hardness of 80A-80D, so that the number of layers of aramid fiber woven fabric is relatively small, and the single-layer thickness of the finished fiber-resin composite material can be limited to between 0.15mm-1mm. Of course, the thickness after lamination is related to the number of layers, which can ensure the wear resistance of the fiber-resin composite material, while also ensuring the flexibility of the fiber-resin composite material, and also ensure that the thickness of the fiber-resin composite material is not too large.

[0067] In some embodiments of the present invention, the composite layer and the substrate are semi-preg. Referring to FIG. 2 , step S20 includes:

[0068] Step S21: selecting a resin with a Shore hardness between 30A and 85D as a composite layer, and superimposing the composite layer on the aramid fiber woven fabric;

[0069] Step S22: semi-prepreg the stacked composite layer and the aramid fiber woven fabric through hot pressing rollers to obtain a semi-finished fiber resin composite material.

[0070] The resin with a Shore hardness between 30A and 85D in this embodiment can be a TPE resin film. The fiber resin composite material semi-finished product obtained by hot-pressing the TPE resin film and the aramid fiber woven fabric by hot pressing rollers has certain flexibility and wear resistance. The fiber resin composite material finished product obtained by this method has high flexibility, which ensures that the mobile phone case made of the fiber resin composite material can wrap the product in all directions; and the aramid fiber woven fabric with a larger gram weight maintains sufficient wear resistance.

[0071] In other embodiments of the present invention, when the composite layer and the substrate are fully pre-impregnated, referring to FIG. 3 , step S20 includes:

[0072] Step S21': selecting a resin with a Shore hardness between 30A and 85D as a composite layer, melting the composite layer and placing it in a prepreg device;

[0073] Step S22': placing the aramid fiber woven fabric in the prepreg equipment for full prepreg to obtain a fiber resin composite material semi-finished product.

[0074] In this embodiment, the resin with a Shore hardness between 30A and 85D can be a TPU resin. In this case, the substrate and composite layer are preferably combined using a fully pre-impregnated method. This allows the TPU resin to fully impregnate the two layers of aramid fiber woven fabric. This not only ensures the hardness of the finished fiber-resin composite material, but also ensures a relatively thin thickness. Furthermore, the finished fiber-resin composite material produced using this method has a certain degree of flexibility while retaining the wear-resistant characteristics of aramid fiber mobile phone cases, thus ensuring the performance of mobile phone cases made using the fiber-resin composite material.

[0075] Referring to FIG4 , the present invention further provides a method for manufacturing a mobile phone case, comprising the following steps:

[0076] Step S100: selecting a fiber-resin composite material as a first sheet material, wherein the fiber-resin composite material is manufactured by the above-mentioned manufacturing method of the fiber-resin composite material.

[0077] The manufacturing method of the fiber-resin composite material refers to the above-mentioned embodiments. The hardness of the fiber-resin composite material can be selected according to the needs by selecting the corresponding gram weight of the aramid fiber woven fabric and the corresponding hardness of the resin. Preferably, the hardness of the resin is selected from 50D-85D resin, so that the number of layers of the aramid fiber woven fabric is relatively small, and the single-layer thickness of the fiber-resin composite material can be limited to 0.15mm-1mm, thereby ensuring that the thickness of the mobile phone case is not too thick.

[0078] Step 200: Cutting the first sheet to obtain a preset sheet of a preset size and a preset shape, wherein the preset sheet includes a middle area and an edge area arranged around the middle area.

[0079] The fiber-resin composite material can be cut using a laser cutter or cutting machine to obtain a predetermined sheet of a predetermined size and shape. The predetermined sheet is typically rectangular, waist-shaped, or in other shapes, though these are not specifically limited herein. The predetermined sheet includes a central region and an edge region surrounding the central region. The central region of the predetermined sheet is molded to form the main body 110 of the mobile phone case, and the edge regions of the predetermined sheet are molded to form the reinforcement portion 120 of the mobile phone case.

[0080] Step 300: Select a semi-cured material or a cured material as the second sheet material, adhere the second sheet material to the middle area of ​​the preset sheet material, and place the second sheet material together with the preset sheet material on the mobile phone case model.

[0081] When the second sheet is formed of semi-cured material, it is glass fiber board (glass fiber board) and other materials. When the above-mentioned second sheet is formed of cured material, the second sheet is carbon fiber board, stainless steel board, PC board (polycarbonate board) and other materials. The specific material used for the second sheet can be selected according to actual needs. The setting of the second sheet improves the strength of the fitting position between the mobile phone case and the back of the mobile phone.

[0082] Step 400: performing secondary molding on the second sheet and the preset sheet through a molding process, wherein the secondary molding temperature is 160° C.-200° C., the pressure is 40 bar, and the duration is 5 min-15 min.

[0083] The temperature of the secondary molding can be 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, 150°C, 200°C, etc. The pressure of the secondary molding can be 35 bar, 36 bar, 37 bar, 38 bar, 39 bar, 40 bar, 41 bar, 42 bar, 43 bar, 44 bar, 45 bar, etc. The duration of the secondary molding can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, etc. The temperature, pressure and duration of the secondary molding are respectively related to the molding temperature and molding pressure required for the preset sheet, and are also related to the composite temperature and pressure of the preset sheet and the second sheet.

[0084] Since the second sheet is fitted with the middle area of ​​the preset sheet and placed on the mobile phone case model, after the preset sheet and the second sheet are secondary molded, the preset sheet is pressed into the shape of the mobile phone case, and the second sheet is connected to the position where the preset sheet forms the bottom plate of the mobile phone case. In this way, the preset sheet can be molded into the shape of the mobile phone case through the secondary molding process, and the preset sheet and the second sheet are also connected together, thereby simplifying the manufacturing process of the mobile phone case.

[0085] Step S500: After the second sheet material and the preset sheet material are subjected to secondary molding for a predetermined time, the second sheet material and the preset sheet material are cooled to room temperature to obtain a finished mobile phone case.

[0086] There are many ways to cool the second sheet and the preset sheet. The second sheet and the preset sheet can be cooled to room temperature by natural cooling, by water cooling, air cooling, etc., or by temperature control by equipment. The cooling method can be gradient change, curve change, or linear change, and no specific limitation is made here. The second sheet and the preset sheet are cooled to room temperature, and the preset sheet is solidified and connected to the second sheet to form a finished mobile phone case.

[0087] The method for manufacturing a mobile phone case of the present invention selects a fiber resin composite material as the first sheet material, and selects a semi-cured material or a cured material as the second sheet material. The second sheet material is bonded to a preset sheet material cut from the first sheet material and placed on a mobile phone case mold, and then the mobile phone case is formed by secondary molding. The bottom plate and four side panels of the mobile phone case manufactured by this method are integrally formed, and the heights of the four side panels are consistent, so that the four sides of the mobile phone can be fully covered. In addition, the fiber resin composite material has a certain degree of flexibility, so that the four side panels can produce a certain degree of deformation when subjected to external force, which is conducive to the disassembly and assembly of the mobile phone. In addition, the fiber resin composite material has a certain degree of flexibility, which also allows the four side panels of the four mobile phone cases to be bonded to the corresponding sides of the mobile phone case.

[0088] Referring to Figures 5 and 6, the present invention further provides a mobile phone case 100, which includes a main body 110 and a reinforcement portion 120. The main body 110 includes a load-bearing area 110a that is in contact with the back of the mobile phone and a covering area 110b that covers the side of the mobile phone. The main body 110 is made of a fiber-resin composite material, and the reinforcement portion 120 is made of a semi-cured material or a cured material. The reinforcement portion 120 is provided in the load-bearing area 110a. The fiber-resin composite material includes an aramid fiber woven fabric layer 111 and a resin composite layer 112. The aramid fiber woven fabric layer 111 includes 1-5 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer 111 is 100g / m 2 -350g / m2 The Shore hardness of the resin composite layer 112 is 80A-80D.

[0089] The manufacturing method of the fiber resin composite material refers to the above embodiment. In some embodiments, the aramid fiber woven fabric layer 111 includes 1-3 layers of aramid fiber woven fabric, and the aramid fiber woven fabric layer 111 has a gram weight of 300±50g / m 2 , the Shore hardness of the resin composite layer 112 is 80A-50D; or, the aramid fiber woven fabric layer 111 includes 3-5 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer 111 is 150±15g / m 2 The Shore hardness of the resin composite layer 112 is 90A-65D.

[0090] Specifically, please refer to FIG7 , the fiber resin composite material includes an aramid fiber woven fabric layer 111 and a resin composite layer 112 , the aramid fiber woven fabric layer 111 is two layers, and the gram weight of the aramid fiber woven fabric layer 111 is 300±50g / m 2 The Shore hardness of the resin composite layer 112 is 80A. Of course, Figure 7 is merely a schematic diagram. As the degree of impregnation changes, the finished product may not have a clear layered relationship between the aramid fiber woven fabric layer 111 and the resin composite layer 112. The resin composite layer 112 is TPE resin.

[0091] Please refer to FIG8 . The fiber resin composite material includes an aramid fiber woven fabric layer 111 and a TPU resin composite layer 113 . The aramid fiber woven fabric layer 111 is 4 layers and has a gram weight of 150±15 g / m 2 The Shore hardness of the TPU resin composite layer 113 is 90A. Of course, FIG8 is only a schematic diagram, and as the degree of infiltration changes, the finished product may not have a clear layered relationship between the aramid fiber woven fabric layer 111 and the TPU resin composite layer 113.

[0092] Based on the above technical solution, different materials can be selected as the composite layer of the fiber resin composite material, so that the hardness of the fiber resin composite material can be adjusted according to needs, so that the covering area 110b of the main body 110 made of the fiber resin composite material can better cover the side of the mobile phone, and it is also convenient for the mobile phone to be inserted into the main body 110 or taken out from the main body 110.

[0093] The phone cases shown in Figures 7 and 8 were tested against a common commercially available aramid fiber phone case impregnated with epoxy resin, targeting the same covered area. Laboratory measurements revealed that the Shore hardness of the phone case in Figure 7 was 50D, while that of the phone case in Figure 8 was 75D. The Shore hardness of the commercially available phone case was 92D. While meeting basic protective requirements such as wrapping and wear resistance, the covered area of ​​the phone case in this invention is softer and easier to remove.

[0094] The resin composite layer 112 is made of TPE or TPU resin, and the reinforcement 120 is formed of a pre-cured material, such as a fiberglass board. Alternatively, the reinforcement 120 can be formed of a cured material, such as a carbon fiber board, stainless steel board, or a hard polymer material such as PC board. The method for cladding the reinforcement 120 with the main body 110 is similar to the method for manufacturing a mobile phone case described above. The provision of the reinforcement 120 helps to increase the strength of the load-bearing area 110a.

[0095] Since the mobile phone case 100 in the present application uses a fiber-resin composite material as the raw material of the main body 110, this ensures that the covering area 110b of the main body 110 has good flexibility. The covering area 110b can be deformed when the mobile phone is inserted into or removed from the main body 110, thereby facilitating the disassembly and assembly of the mobile phone and the mobile phone case 100; in addition, when the mobile phone is inserted into the main body 110, the covering area 110b respectively fits the corresponding side edges of the mobile phone and covers the corresponding side edges of the mobile phone; in addition, the bearing area 110a of the main body 110 is also compounded with the reinforcement part 120, thereby ensuring the strength of the fitting position between the mobile phone case 100 and the back of the mobile phone.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for producing a fiber resin composite material, characterized in that: The following steps are involved: step S10: Aramid fiber woven fabric is selected as the base material, and the gram weight of the aramid fiber woven fabric is 100g / m 2 -350g / m 2 , the number of layers of the aramid fiber woven fabric is N, where N is a positive integer greater than or equal to 1; Step S20: selecting a resin with a Shore hardness between 30A and 85D as a composite layer, and fully pre-impregnating or semi-pre-impregnating the composite layer and the substrate to obtain a semi-finished fiber resin composite material; Step 30: placing the fiber resin composite semi-finished product in a hot pressing device for hot pressing, so that the resin penetrates into the gaps of the aramid fiber woven fabric, wherein the hot pressing temperature of the hot pressing device is 150° C.-250° C., the pressure is 40 bar-55 bar, and the duration is 2 min-10 min; Step 40: After the hot pressing device hot presses the fiber resin composite material semi-finished product for a preset hot pressing time, stop heating the fiber resin composite material semi-finished product to obtain a fiber resin composite material finished product.

2. The method for producing a fiber-resin composite material according to claim 1, wherein: The value of N is negatively correlated with the grammage of the aramid fiber woven fabric, wherein 1≤N≤5.

3. The method for producing a fiber-resin composite material according to claim 2, wherein: The aramid fiber woven fabric has a gram weight of 300±50g / m 2 , the laminated layer of the aramid fiber woven fabric is 1-3 layers, and the composite layer is a resin with a Shore hardness of 80A-50D; or, The aramid fiber woven fabric has a gram weight of 150±15 g / m 2 The aramid fiber woven fabric has 3 to 5 layers, and the composite layer is a resin with a Shore hardness of 90A to 65D.

4. The method for producing a fiber-resin composite material according to claim 1, wherein: The composite layer is made of resin with a Shore hardness of 80A-80D, and the single layer thickness of the finished fiber resin composite material product is 0.15mm-1mm.

5. The method for producing a fiber-resin composite material according to claim 1, wherein: When semi-immersion is adopted, the step S20 includes: Step S21: selecting a resin with a Shore hardness between 30A and 85D as a composite layer, and superimposing the composite layer on the aramid fiber woven fabric; Step S22: semi-prepreg the stacked composite layer and the aramid fiber woven fabric through a hot pressing roller to obtain a fiber resin composite material semi-finished product; When full infiltration is adopted, the step S20 includes: Step S21': selecting a resin with a Shore hardness between 30A and 85D as a composite layer, melting the composite layer and placing it in a prepreg device; Step S22': placing the aramid fiber woven fabric in the prepreg device for full prepreg to obtain a fiber resin composite material semi-finished product.

6. A method for manufacturing a mobile phone case, characterized in that: The following steps are involved: Step S100: selecting a fiber-resin composite material as a first sheet material, wherein the fiber-resin composite material is manufactured by the method for manufacturing a fiber-resin composite material according to any one of claims 1 to 5; Step 200: cutting the first sheet to obtain a preset sheet of a preset size and a preset shape, wherein the preset sheet includes a middle area and an edge area surrounding the middle area; Step 300: Select a semi-cured material or a cured material as the second sheet material, adhere the second sheet material to the middle area of ​​the preset sheet material, and place the second sheet material together with the preset sheet material on the mobile phone case model; Step 400: performing secondary molding on the second sheet and the preset sheet through a molding process, wherein the temperature of the secondary molding is 160° C.-200° C., the pressure is 40 bar, and the duration is 5 min-15 min; Step S500: After the secondary molding time of the second sheet material and the preset sheet material reaches the preset molding time, the second sheet material and the preset sheet material are cooled to room temperature to obtain a finished mobile phone case.

7. The method for manufacturing a mobile phone case according to claim 6, characterized in that: The second sheet material is formed of a semi-cured material, and the second sheet material is a fiberglass board; or, The second sheet material is formed of a solidified material, and the second sheet material is a carbon fiber plate, a stainless steel plate, or a PC plate.

8. A mobile phone case, characterized in that: The mobile phone case comprises a main body made of a fiber resin composite material and a reinforcement part made of a semi-cured material or a cured material, the main body comprises a bearing area that fits the back of the mobile phone and a covering area that covers the side of the mobile phone, and the reinforcement part is arranged in the bearing area; the fiber resin composite material comprises an aramid fiber woven fabric layer and a resin composite layer, the aramid fiber woven fabric layer comprises 1-5 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer is 100g / m 2 -350g / m 2 The Shore hardness of the resin composite layer is 80A-80D.

9. The mobile phone case according to claim 8, characterized in that: The aramid fiber woven fabric layer includes 1-3 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer is 300±50g / m 2 , the Shore hardness of the resin composite layer is 80A-50D; or, The aramid fiber woven fabric layer includes 3-5 layers of aramid fiber woven fabric, and the gram weight of the aramid fiber woven fabric layer is 150±15g / m 2 The Shore hardness of the resin composite layer is 90A-65D.

10. The mobile phone case according to claim 8, characterized in that: The resin composite layer is TPE resin or TPU resin; the reinforcement part is formed by semi-cured material, and the semi-cured material is glass fiber board; or, The reinforcement part is formed of a solidified material, and the solidified material is a carbon fiber plate, a stainless steel plate, or a PC plate.

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