Plastic frame of interactive smart tablet, display equipment, PC material and preparation method of PC material

Abstract

The invention relates to a plastic frame of an interactive smart tablet, a display device, a PC material and a preparation method of the PC material. The plastic frame comprises a frame outer layer, and the frame outer layer is made of a PMMA material; the frame middle layer is made of a PC material, and the frame middle layer is connected to the inner side of the frame outer layer; the frame inner layer is made of an infrared transmitting PC material, and the frame inner layer is respectively connected with the frame outer layer and the frame middle layer; wherein the outer frame layer, the middle frame layer and the inner frame layer are co-extruded into an integrally formed structure by adopting a multi-layer co-extrusion process of a single-screw extruder. The three layers of materials are of an injection molding integrally-formed structure, so that the plastic frame can be directly assembled and used after being extruded, the frame inner layer (the infrared transmitting PC material) can meet the infrared light transmitting requirement and meet the touch operation requirement, and therefore the procedure of assembling the PC light filtering strip and the frame can be omitted, and the effects of saving the procedure steps and improving the machining efficiency are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of frame processing, and in particular to a plastic frame and display device of an interactive smart tablet, PC material and a preparation method thereof. Background Art

[0002] The frame plays the role of a main body in a display device, used to load and fix display modules, panels and other components. As part of the appearance, it plays a relatively important role. Currently, the frame material used in most display devices is aluminum alloy. However, the high density of aluminum alloy material makes the overall frame heavy, resulting in a large weight of the display device, which increases the user's usage burden. In addition, the color adjustment space of aluminum alloy frames is extremely limited, and the color must be obtained through anodizing processing. Anodizing requires the use of chemicals, involving wastewater treatment, and increasing manufacturing costs. Furthermore, after the aluminum alloy frame is processed, it needs to be assembled with the filter strip, which has many production steps and low processing efficiency. Summary of the Invention

[0003] Based on this, it is necessary to provide a plastic frame and display device, PC material and preparation method of an interactive smart tablet to address the problems of heavy weight, high manufacturing cost and low processing efficiency.

[0004] In a first aspect of the present application, a plastic frame for an interactive smart tablet is provided, comprising:

[0005] The outer layer of the frame is made of PMMA material;

[0006] A frame middle layer, the frame middle layer is made of PC material, and the frame middle layer is connected to the inner side of the frame outer layer; and

[0007] The inner layer of the frame is made of infrared-transparent PC material and is connected to the outer layer of the frame and the middle layer of the frame respectively;

[0008] The outer frame layer, the middle frame layer and the inner frame layer are co-extruded into an integrally formed structure by a multi-layer co-extrusion process using a single-screw extruder.

[0009] The plastic frame of the interactive smart tablet of the above scheme is specifically composed of a three-layer structure of a frame outer layer, a frame middle layer and a frame inner layer. Among them, by using PMMA material for the frame outer layer, PC material for the frame middle layer and infrared-transparent PC material for the frame inner layer, the frame outer layer, the frame middle layer and the frame inner layer can be co-extruded at one time through a single-screw extruder multi-layer co-extrusion process to form an integrated molding structure during processing, thereby obtaining a three-layer co-extruded multi-layer structure of a plastic frame. Compared with the aluminum alloy frame in the prior art, on the one hand, the density of the plastic material is much lower than that of the aluminum alloy, so the plastic frame and the display device using the plastic frame The weight will be significantly reduced, which will help reduce the burden on users. On the other hand, the outer layer of the frame is made of PMMA material, which can facilitate various color adjustments according to the product appearance requirements, providing a richer color selection space, and does not require the use of chemical solutions due to anodizing, and there is no problem of increased manufacturing costs caused by sewage treatment. Furthermore, the three-layer material is an injection-molded one-piece molding structure, so that the plastic frame can be directly assembled and used after extrusion. The inner layer of the frame (infrared-transparent PC material) can meet the infrared light transmittance requirements and meet touch operations, thereby eliminating the process of assembling the PC filter strip and the frame, thereby saving process steps and improving processing efficiency.

[0010] The technical solution of this application is further described below:

[0011] In one embodiment, the outer layer of the frame includes a first surface, the middle layer of the frame includes a second surface, the inner layer of the frame includes a third surface, and the first surface is tightly bonded to the second surface and the third surface.

[0012] In one embodiment, the outer layer of the frame is further provided with a hook portion, and the middle layer of the frame further includes a fourth surface bent adjacent to the second surface, and the hook portion is hooked and connected to the fourth surface.

[0013] In one embodiment, the middle layer of the frame is further provided with a first end face and a second end face, and the inner layer of the frame is further provided with a third end face and a fourth end face, the first end face is tightly combined with the third end face, and the second end face is tightly combined with the fourth end face.

[0014] In a second aspect of the present application, a display device is provided, which includes the plastic frame of the interactive smart tablet as described above.

[0015] The display device is equipped with a plastic frame. During processing, the outer layer, middle layer and inner layer of the frame can be co-extruded at one time through a single-screw extruder multi-layer co-extrusion process to form an integrated molded structure. Compared with the aluminum alloy frame in the prior art, on the one hand, the density of the plastic material is much lower than that of aluminum alloy. Therefore, the weight of the plastic frame and the display device using the plastic frame will be significantly reduced, thereby helping to reduce the burden on users. On the other hand, the outer layer of the frame is made of PMMA material, which can be easily adjusted to various colors according to the product appearance requirements, providing a richer color selection space, and does not require the use of chemical solutions due to anodizing, and there is no problem of increased manufacturing costs due to sewage treatment. Furthermore, the three-layer material is an injection molded integrated structure, so that the plastic frame can be directly assembled and used after extrusion. The inner layer of the frame (infrared-transparent PC material) can meet the infrared light transmission requirements and meet touch operation, thereby eliminating the process of assembling the PC filter strip and the frame, thereby saving process steps and improving processing efficiency.

[0016] In a third aspect of the present application, a PC material is provided, comprising the following raw material components in parts by weight:

[0017] 50-90 parts of PC resin, 1-50 parts of resin, 1-20 parts of toughening agent, 1-50 parts of fiber filler and 1-10 parts of floating fiber treatment agent.

[0018] The PC material is made from the above raw material components, and the frame middle layer is injection molded using the PC material, which can significantly reduce the floating fibers on the surface of the frame middle layer, enhance the compatibility of the frame middle layer with the frame outer layer and the frame inner layer, improve the bonding strength of the frame middle layer, the frame outer layer and the frame inner layer, and enhance the comprehensive performance of the plastic frame.

[0019] In one embodiment, the PC resin is bisphenol A polycarbonate;

[0020] The resin is one or more of PMMA, PCTG, PETG, PC-PMMA copolymer, PBT, and PET;

[0021] The toughening agent is one or more of MBS, ABS high rubber powder, silicone rubber, and acrylate;

[0022] The fiber filler is one or more of glass fiber, carbon fiber, natural fiber, metal fiber, and fibrous whiskers;

[0023] The floating fiber treating agent is a hyperbranched polymer.

[0024] In one embodiment, the raw material components are as follows, in parts by weight:

[0025] 55 to 70 parts of PC resin, 10 to 25 parts of resin, 5 to 10 parts of toughening agent, 10 to 25 parts of fiber filler and 2 to 8 parts of floating fiber treatment agent.

[0026] In one embodiment, the raw material components further include 0.1 to 5 parts of a functional additive, wherein the functional additive includes one or both of an antioxidant and a lubricant;

[0027] The antioxidant includes one or more of hindered phenol, phosphite and thioether antioxidants; and / or,

[0028] The lubricant includes one or more of hydrocarbon, stearic acid soap, stearic acid ester and stearic acid amide lubricants.

[0029] In a fourth aspect of the present application, a preparation method for processing PC material is provided, which comprises the following steps:

[0030] The raw material components are mixed, and the resulting mixture is melted, extruded and granulated.

[0031] In one embodiment, the melting and extrusion are performed by twin-screw extrusion;

[0032] Optionally, the extrusion temperature is 250°C to 300°C;

[0033] Optionally, the screw has a rotation speed of 300 r / min to 1000 r / min. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0035] 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] Figure 1 Schematic diagram of the cross-sectional structure of the plastic frame of the interactive smart tablet according to one embodiment of the present application.

[0037] Description of reference numerals:

[0038] 100. Plastic frame of the interactive smart tablet; 10. Frame outer layer; 11. First surface; 12. Hook; 20. Frame middle layer; 21. Second surface; 22. Fourth surface; 23. First end face; 24. Second end face; 30. Frame inner layer; 31. Third surface; 32. Third end face; 33. Fourth end face. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0042] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0045] As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.

[0046] In this application, terms such as "first aspect," "second aspect," and "third aspect" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, terms such as "first," "second," and so on serve only as non-exhaustive enumerations and descriptions and should not constitute closed-ended limitations on quantity.

[0047] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0048] In this application, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0049] Unless otherwise specified, the percentage contents mentioned in this application refer to mass percentage for solid-liquid mixture and solid-solid mixture, and refer to volume percentage for liquid-liquid mixture.

[0050] The percentage concentrations mentioned in this application, unless otherwise specified, refer to the final concentration, which refers to the percentage of the added component in the system after the addition of the component.

[0051] The temperature parameters in this application, unless otherwise specified, allow for both constant temperature treatment and treatment within a certain temperature range. The constant temperature treatment allows for temperature fluctuations within the precision range of instrument control.

[0052] See Figure 1 , is a schematic diagram of the cross-sectional structure of a plastic frame 100 of an interactive smart tablet shown in an embodiment of the present application, which includes a frame outer layer 10, a frame middle layer 20 and a frame inner layer 30.

[0053] Among them, the outer layer 10 of the frame is made of PMMA material; the middle layer 20 of the frame is made of PC material, and the middle layer 20 of the frame is connected to the inner side of the outer layer 10 of the frame; the inner layer 30 of the frame is made of infrared-transparent PC material, and the inner layer 30 of the frame is respectively connected to the outer layer 10 and the middle layer 20 of the frame.

[0054] The frame outer layer 10 , the frame middle layer 20 and the frame inner layer 30 are co-extruded into an integrally formed structure by a multi-layer co-extrusion process using a single-screw extruder.

[0055] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: the plastic frame 100 of the interactive smart tablet of the above solution is specifically composed of a three-layer structure of a frame outer layer 10, a frame middle layer 20 and a frame inner layer 30. Among them, by using PMMA material for the frame outer layer 10, PC material for the frame middle layer 20 and infrared-transparent PC material for the frame inner layer 30, the frame outer layer 10, the frame middle layer 20 and the frame inner layer 30 can be co-extruded at one time through a single-screw extruder multi-layer co-extrusion process to form an integrated molding structure during processing, thereby obtaining a plastic frame 100 of the interactive smart tablet with a three-layer co-extruded multi-layer structure.

[0056] Compared with the aluminum alloy frame in the prior art, on the one hand, the density of plastic material is much lower than that of aluminum alloy, so the weight of the plastic frame 100 of the interactive smart tablet and the display device using the plastic frame 100 of the interactive smart tablet will be significantly reduced, thereby helping to reduce the burden on users; on the other hand, the outer layer 10 of the frame is made of PMMA material, which can be easily adjusted in various colors according to the product appearance requirements, providing a richer color selection space, and does not require the use of chemical solutions due to anodizing, and there is no problem of increased manufacturing costs caused by sewage treatment; furthermore, the three-layer material is an injection-molded integrated structure, so that the plastic frame 100 of the interactive smart tablet can be directly assembled and used after extrusion, wherein the inner layer 30 of the frame (infrared-transparent PC material) can meet the infrared light transmittance requirements and meet touch operations, thereby eliminating the process of assembling the PC filter strip and the frame, thereby saving process steps and improving processing efficiency.

[0057] It is necessary to explain that PMMA material is polymethyl methacrylate (PMMA), abbreviated as PMMA, which is a high molecular polymer also known as acrylic or organic glass. The outer layer 10 of the frame made of this material is used to give the plastic frame 100 of the interactive smart tablet an aesthetic appearance and wear-resistant functional requirements. The Mitsubishi pencil hardness of this material is above 3H. According to the product appearance requirements, this layer of material can be adjusted in various colors to meet the usage requirements.

[0058] The frame middle layer 20 made of PC material is mainly used to give the plastic frame 100 of the interactive smart tablet structural strength and dimensional stability. At the same time, this layer is used to bond the frame outer layer 10 and the frame inner layer 30.

[0059] The inner layer 30 of the frame is made of infrared-transparent PC material, which is specifically a mixture of PC material and GF (GF is the abbreviation of glass fiber. Glass fiber is a fiber material made of glass. It is made of pure alkaline earth metal oxides (such as SiO2, Al2O3, CaO, etc.) as the main raw materials and is prepared through melting, spinning, stretching and other processes). It has a visible light transmittance of less than 10% and a infrared light transmittance of more than 85% in the range of 800-1000nm. Therefore, it can be used to realize touch operation of the display screen.

[0060] Please continue reading Figure 1In some optional embodiments, the frame outer layer 10 includes a first surface 11, the frame middle layer 20 includes a second surface 21, and the frame inner layer 30 includes a third surface 31. The first surface 11 is tightly bonded to the second surface 21 and the third surface 31. Thus, the first surface 11 can be tightly bonded to both the second surface 21 and the third surface 31. This increases the bonding area and strength between the frame outer layer 10, the frame middle layer 20, and the frame inner layer 30, thereby improving the overall structural performance of the interactive smart tablet's plastic frame 100.

[0061] In the present application, the frame outer layer 10, the frame middle layer 20 and the frame inner layer 30 are all strip-shaped components, for example, they can be any one of linear, L-shaped and U-shaped. Figure 1 A cross-sectional view of the frame structure formed after the three-layer structure is assembled is shown.

[0062] from Figure 1 It can be seen that the cross-section of the frame outer layer 10 is L-shaped, and the first surface 11 is the L-shaped inner surface of the frame outer layer 10; the frame middle layer 20 is a semi-closed rectangular frame (that is, it has a notch, which can be used for the subsequent installation of the infrared transmitter and the infrared receiver), and the second surface 21 is specifically the two adjacent L-shaped surfaces of the frame middle layer 20 facing the frame outer layer 10; the frame inner layer 30 is a U-shaped structure, and when installed, the opening of the frame inner layer 30 faces the notch of the frame middle layer 20, and the third surface 31 is a partial outer surface of the frame inner layer 30.

[0063] Furthermore, the outer frame layer 10 is further provided with a hook portion 12, and the intermediate frame layer 20 further includes a fourth surface 22 bent adjacent to the second surface 21, and the hook portion 12 is hooked and connected to the fourth surface 22. This can further improve the bonding strength and firmness of the outer frame layer 10 and the intermediate frame layer 20.

[0064] Please continue reading Figure 1 Furthermore, the frame middle layer 20 further comprises a first end face 23 and a second end face 24, and the frame inner layer 30 further comprises a third end face 32 and a fourth end face 33. The first end face 23 is tightly bonded to the third end face 32, and the second end face 24 is tightly bonded to the fourth end face 33. This further improves the bonding strength and firmness between the frame middle layer 20 and the frame inner layer 30.

[0065] By assembling the above components and structural features, the plastic frame can obtain a frame structure that is hollow inside and closed around the periphery.

[0066] In a second aspect of the present application, a display device is provided, which includes the plastic frame 100 of the interactive smart tablet as described above.

[0067] For example, the display device can be any one of a smart interactive tablet, a large conference screen, a computer, etc., and can be selected according to actual needs.

[0068] The display device is equipped with a plastic frame 100 of an interactive smart tablet. During processing, the outer frame layer 10, the middle frame layer 20 and the inner frame layer 30 can be co-extruded at one time through a single-screw extruder multi-layer co-extrusion process to form an integrated structure. Compared with the aluminum alloy frame in the prior art, on the one hand, the density of the plastic material is much lower than that of the aluminum alloy. Therefore, the weight of the plastic frame 100 of the interactive smart tablet and the display device using the plastic frame 100 of the interactive smart tablet will be significantly reduced, thereby helping to reduce the burden on users. On the other hand, the outer frame layer 10 adopts PM MA material can be easily adjusted to various colors according to the product appearance requirements, providing a richer color selection space, and does not require the use of chemical solutions due to anodizing, and there is no problem of increased manufacturing costs caused by sewage treatment; furthermore, the three-layer material is an injection-molded one-piece structure, so that the plastic frame 100 of the interactive smart tablet can be directly assembled and used after extrusion, among which the inner layer 30 of the frame (infrared-transparent PC material) can meet the infrared light transmission requirements and meet touch operations, thereby eliminating the process of assembling the PC filter strip and the frame, thereby saving process steps and improving processing efficiency.

[0069] In a third aspect of the present application, a PC material is provided. Specifically, the PC material may be a low-floating fiber reinforced PC material, comprising the following raw material components in parts by weight:

[0070] 50-90 parts of PC resin, 1-50 parts of resin, 1-20 parts of toughening agent, 1-50 parts of fiber filler and 1-10 parts of floating fiber treatment agent.

[0071] The PC material is made from the above raw material components, and the frame middle layer 20 is injection molded using the PC material. This can significantly reduce the floating fibers on the surface of the frame middle layer 20, enhance the compatibility of the frame middle layer 20 with the frame outer layer 10 and the frame inner layer 30, improve the bonding strength of the frame middle layer 20, the frame outer layer 10 and the frame inner layer 30, and enhance the comprehensive performance of the plastic frame 100 of the interactive smart tablet.

[0072] In some optional embodiments, the PC resin is bisphenol A polycarbonate. Bisphenol A polycarbonate is one of the five major general-purpose engineering plastics. It has high mechanical strength, excellent rigidity-toughness balance, excellent dimensional stability, and a heat deformation temperature above 130°C. These excellent overall properties make it widely used in electronics, home appliances, transportation, and other fields.

[0073] The resin is one or more of PMMA, PCTG, PETG, PC-PMMA copolymer, PBT, and PET. It is used to improve the compatibility between PC and PMMA.

[0074] Toughening agents are one or more of MBS, ABS high-rubber powder, silicone rubber, and acrylate. They are mainly used to improve the impact strength of PC systems.

[0075] The fibrous filler is one or more of glass fiber, carbon fiber, natural fiber, metal fiber, and fibrous whiskers. The length of this type of filler is preferably 1µm to 30µm, and it can mainly improve the tensile strength, tensile modulus, flexural strength, and flexural modulus of the PC system.

[0076] The floating fiber treatment agent is a hyperbranched polymer. It is mainly used to better coat and disperse the glass fiber in PC and resin, effectively improving the flow properties of PC and resin.

[0077] In an optional embodiment, the following raw material components are included in parts by weight:

[0078] 55 to 70 parts of PC resin, 10 to 25 parts of resin, 5 to 10 parts of toughening agent, 10 to 25 parts of fiber filler and 2 to 8 parts of floating fiber treatment agent.

[0079] In addition, in some optional embodiments, the raw material components further include 0.1 to 5 parts of a functional additive, wherein the functional additive includes one or both of an antioxidant and a lubricant;

[0080] The antioxidant includes one or more of hindered phenol, phosphite and thioether antioxidants; and / or,

[0081] The lubricant includes one or more of hydrocarbon, stearic acid soap, stearic acid ester and stearic acid amide lubricants.

[0082] Antioxidant 1# mainly refers to hindered phenols such as 1010, 1076, and 245, and antioxidant 2# mainly refers to phosphites such as 168 and PEP36. These two antioxidants are used to inhibit the aging reaction of PC and resin during the processing process to ensure the performance stability of the material.

[0083] Lubricants mainly refer to polyol esters, silicones and stearic acids, which can reduce the viscosity of the components of the PC system during the melt blending process. In addition, they can ensure that the prepared PC composite materials have good demolding properties during the subsequent processing and molding process.

[0084] For example, antioxidants, antioxidant 1098 and antioxidant 168, were purchased from Tianjin Li'anlong New Materials Co., Ltd.

[0085] Lubricant, lubricant PETS, was purchased from Italy's Faji Group.

[0086] In a fourth aspect of the present application, a preparation method for processing PC material is provided, which comprises the following steps:

[0087] The raw material components are mixed, and the resulting mixture is melted, extruded and pelletized.

[0088] In one embodiment, the melting and extrusion are performed by twin-screw extrusion;

[0089] Optionally, the extrusion temperature is 250°C to 300°C;

[0090] Optionally, the screw has a rotation speed of 300 r / min to 1000 r / min.

[0091] Example 1

[0092] Provided is a low-floating fiber reinforced PC composite material, wherein the resin is taken as copolyester PCTG, and the composite material includes the following raw materials in parts by weight: 60 parts of PC, 30 parts of PCTG, 10 parts of toughening agent MBS, 20 parts of glass fiber, 3 parts of low-floating fiber treatment agent such as Mitsui 1105A, 1 part of antioxidant 1#1076, 1 part of antioxidant 2#168, and 2 parts of lubricant PETS.

[0093] The preparation method of low-floating fiber reinforced PC composite material comprises the following steps:

[0094] (1) According to the predetermined raw material ratio, PC, PCTG, MBS, 1105A, 1076, 168, and PETS are added to a high-speed mixer in sequence and mixed evenly under certain conditions to prepare a premixed material;

[0095] (2) The premix in step (1) is melt-blended and pelletized through a twin-screw extruder to obtain a low-floating fiber PC composite material. Furthermore, in step (1), the blending conditions are as follows: first, high-speed stirring at a speed of 1000 rpm for 3 minutes, then low-speed stirring at a speed of 100 rpm for 5 minutes, and discharging at 100 rpm. The extruder processing parameters in step (2) are as follows: the extruder main engine speed is 400 rpm, the temperature of each zone is controlled within the range of 250~280℃, and according to the raw material ratio, the premix in step (2) is added from the main feed port of the extruder, and the glass fiber is added from the side feed port of the extruder.

[0096] The following is a detailed description of the performance test results of the PC material and injection molded strips of the present invention in conjunction with specific examples and comparative examples. The preparation methods of Examples 2 to 4 and Comparative Examples 1 to 3 are the same as those of Example 1, with the main differences shown in the following table.

[0097]

[0098] Test example:

[0099] Test methods: Tensile strength was tested according to ISO 527; flexural strength and flexural modulus were tested according to ISO 178; notched impact strength was tested according to ISO 179; heat deflection temperature was tested according to ISO 75; and melt flow rate (MFR) was tested according to ISO 1133. The test results are shown in Table 2 below.

[0100]

[0101] The degree of fiber floating is determined by the appearance of the plastic frame 100 of the interactive smart tablet after extrusion. Comparing the actual images shows that after three-layer co-extrusion, the outer layer is a spray-free PMMA layer. If the middle PC fiber-reinforced layer has low fiber floating, it will have little effect on the appearance of the PMMA layer, resulting in a smooth appearance similar to the brushed effect of an aluminum alloy frame. However, if the PC fiber-reinforced layer has significant fiber floating, it will also affect the appearance of the PMMA layer, resulting in a rougher appearance.

[0102] From the examples, we can see that the PC material designed in the present invention has good rigidity and toughness balance performance, and the ISO impact strength is 10kJ / m 2 The tensile strength is above 55MPa, the flexural strength is above 78MPa, and the flexural modulus is above 4200MPa. Moreover, after the three layers are co-extruded, judging from the appearance, the floating fiber is weaker and the PMMA layer has a smooth appearance.

[0103] Compared with Example 1#, Comparative Example 1# does not add the resin PCTG, and the floating fiber is more serious. This is because, on the one hand, after the resin and PC are compounded, the viscosity of PC can be effectively reduced, and on the other hand, the glass fiber can be effectively wrapped, making it difficult for the glass fiber to reach the PC surface during processing; although Comparative Example 2# has weaker floating fiber, it does not add the toughening component MBS, and the impact strength of the material is low. Comparative Example 3# does not add the floating fiber treatment agent 1105A, and the floating fiber is also more serious.

[0104] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A plastic frame for an interactive smart tablet, characterized in that: include: The outer layer of the frame is made of PMMA material; A frame middle layer, the frame middle layer is made of PC material, and the frame middle layer is connected to the inner side of the frame outer layer; and The inner layer of the frame is made of infrared-transparent PC material and is connected to the outer layer of the frame and the middle layer of the frame respectively; The outer frame layer, the middle frame layer and the inner frame layer are co-extruded into an integrally formed structure by a multi-layer co-extrusion process using a single-screw extruder.

2. The plastic frame of the interactive smart tablet according to claim 1, characterized in that: The outer layer of the frame includes a first surface, the middle layer of the frame includes a second surface, the inner layer of the frame includes a third surface, and the first surface is tightly combined with the second surface and the third surface.

3. The plastic frame of the interactive smart tablet according to claim 2, characterized in that: The outer layer of the frame is further provided with a hook portion, and the middle layer of the frame further includes a fourth surface bent adjacent to the second surface, and the hook portion is hooked and connected to the fourth surface.

4. The plastic frame of the interactive smart tablet according to claim 2, characterized in that: The middle layer of the frame is further provided with a first end face and a second end face, and the inner layer of the frame is further provided with a third end face and a fourth end face, the first end face is tightly combined with the third end face, and the second end face is tightly combined with the fourth end face.

5. A PC material according to any one of claims 1 to 4, characterized in that: In parts by weight, it includes the following raw material components: 50-90 parts of PC resin, 1-50 parts of resin, 1-20 parts of toughening agent, 1-50 parts of fiber filler and 1-10 parts of floating fiber treatment agent.

6. The PC material according to claim 5, characterized in that The PC resin is bisphenol A polycarbonate; The resin is one or more of PMMA, PCTG, PETG, PC-PMMA copolymer, PBT, and PET; The toughening agent is one or more of MBS, ABS high rubber powder, silicone rubber, and acrylate; The fiber filler is one or more of glass fiber, carbon fiber, natural fiber, metal fiber, and fibrous whiskers; The floating fiber treating agent is a hyperbranched polymer.

7. The PC material according to claim 5 or 6, characterized in that: In parts by weight, it includes the following raw material components: 55 to 70 parts of PC resin, 10 to 25 parts of resin, 5 to 10 parts of toughening agent, 10 to 25 parts of fiber filler and 2 to 8 parts of floating fiber treatment agent.

8. The PC material according to claim 5, characterized in that The raw material components further include 0.1 to 5 parts of a functional additive, wherein the functional additive includes one or both of an antioxidant and a lubricant; The antioxidant includes one or more of hindered phenol, phosphite and thioether antioxidants; and / or, The lubricant includes one or more of hydrocarbon, stearic acid soap, stearic acid ester and stearic acid amide lubricants.

9. A method for processing the PC material according to any one of claims 5 to 8, characterized in that: The steps include: The raw material components are mixed, and the resulting mixture is melted, extruded and granulated.

10. The method for preparing the PC material according to claim 9, characterized in that: Melting and extrusion are carried out by twin-screw extrusion; Optionally, the extrusion temperature is 250°C to 300°C; Optionally, the screw has a rotation speed of 300 r / min to 1000 r / min.

11. A display device, characterized in that: A plastic frame comprising the interactive smart tablet according to any one of claims 1 to 4.

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