A high-performance laptop computer shell composite material and preparation method thereof

Abstract

This invention discloses a high-performance laptop computer shell composite material and its preparation method, relating to the field of composite material technology. It comprises the following raw materials in parts by weight: 20-30 parts carbon fiber, 20-30 parts polyphenylene sulfide, 10-20 parts functional polymer, 1-3 parts coupling agent, 3-5 parts nano-titanium dioxide, 1-3 parts aluminum hydroxide flame retardant, 2-4 parts catalyst A, and 3-5 parts benzidine disulfonic acid. The functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid. This composite material exhibits good mechanical properties, excellent flame retardancy, and superior high-temperature resistance and aging resistance.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and in particular to a high-performance laptop computer casing composite material and its preparation method. Background Technology

[0002] The laptop casing is not only the most direct way to protect the laptop body, but also a crucial factor affecting its heat dissipation, weight, and aesthetics. With the rapid development of the laptop industry, laptop casings are evolving towards higher strength, greater rigidity, and lighter weight. Traditional laptop casings are mostly made of alloys or engineering plastics. While alloy casings offer high strength, they generally suffer from drawbacks such as heavy weight, high cost, low wear resistance, and difficulty in molding, impacting the user experience. Engineering plastic casings, while lightweight and inexpensive, have low strength, are easily deformed, and have poor heat resistance, making them unsuitable for the demands of high-performance laptops. It is in this context that carbon fiber composite material casings have emerged, attracting widespread attention within the industry.

[0003] Carbon fiber composites possess numerous advantages, including high strength, high modulus, low specific gravity, low coefficient of thermal expansion, and corrosion resistance. They combine the high strength and robustness of aluminum-magnesium alloys with the plasticity of engineering plastics, resulting in excellent overall performance. However, existing carbon fiber composite laptop casings still suffer from several technical shortcomings, such as a brittle surface, fragility upon drop, high cost, slight electrical leakage if grounded improperly, and the need for further improvement in high-temperature resistance, flame retardancy, and aging resistance.

[0004] To address the aforementioned technical problems, Chinese invention patent CN119078216A discloses a carbon fiber composite material for laptop casings and its preparation process, including the following steps: carbon fiber cloth is laid flat in a mold, coated with an epoxy resin composition, and pre-cured to form a pre-cured carbon fiber layer; polyurethane resin is sequentially injected onto the upper and lower surfaces of the pre-cured carbon fiber layer to form a resin layer; and molding is performed to form the carbon fiber layer, resulting in the carbon fiber composite material. This invention uses an epoxy resin composition made from epoxy resin and a curing agent to coat and impregnate carbon fiber cloth, forming a carbon fiber layer that is lightweight, high-strength, has fast heat dissipation, and good shielding effect. Furthermore, a resin layer with high toughness is placed on both the upper and lower surfaces of the carbon fiber layer, which helps improve the impact resistance of the resulting carbon fiber composite material. However, the mechanical properties, flame retardancy, high-temperature resistance, and aging resistance of this composite material still need further improvement.

[0005] It is evident that there is still a need in this field for a high-performance notebook computer shell composite material with good mechanical properties, excellent flame retardancy, high temperature resistance, and aging resistance, as well as its preparation method. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-performance laptop shell composite material with good mechanical properties, excellent flame retardancy, high temperature resistance and aging resistance, and its preparation method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a high-performance laptop shell composite material, comprising the following raw materials in parts by weight: 20-30 parts carbon fiber, 20-30 parts polyphenylene sulfide, 10-20 parts functional polymer, 1-3 parts coupling agent, 3-5 parts nano titanium dioxide, 1-3 parts aluminum hydroxide flame retardant, 2-4 parts catalyst A, and 3-5 parts benzidine disulfonic acid; the functional polymer comprises structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid.

[0008] Preferably, the carbon fiber is carbon fiber cloth CO6644B, with a thickness of 0.3 mm and a basis weight of 317 g / m². 2 It originates from Toray Industries, Inc. of Japan.

[0009] Preferably, the polyphenylene sulfide is of type 1150C and is provided by Zhejiang NHU Co., Ltd.

[0010] Preferably, the preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 120-130°C under normal pressure for 2-4 hours. Then, the temperature is raised to 235-255°C, and a polycondensation reaction is carried out at 100-300 Pa for 15-22 hours. After cooling to room temperature, the pressure is adjusted to normal, and the product is precipitated in water. The crude product is washed 3-6 times with ethanol and then dried in a vacuum drying oven at 85-95°C to constant weight to obtain the functional polymer.

[0011] Preferably, the molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling-point solvent is 1:1:(0.8-1.2):(9-15).

[0012] Preferably, the high-boiling-point solvent is dimethyl sulfoxide; the inert gas is any one of nitrogen, helium, neon, and argon; and the catalyst B is at least one of thiophosphonate, phosphorous acid, and thiophosphoramide.

[0013] Preferably, the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0014] Preferably, the particle size of the nano-titanium dioxide is 10-60 nm.

[0015] Preferably, the aluminum hydroxide flame retardant is at least one of aluminum oxide flame retardant VK-LA50 and aluminum oxide flame retardant VK-LA100.

[0016] Preferably, catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of (3-5):1.

[0017] Another object of the present invention is to provide a method for preparing the high-performance laptop computer casing composite material, comprising the following steps:

[0018] Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 8-12 minutes to obtain modified resin-based powder.

[0019] Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber.

[0020] Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface.

[0021] Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

[0022] Preferably, the high-temperature heat treatment in step S2 is performed at a temperature of 400-600°C for a time of 10-30 minutes.

[0023] Preferably, the power of the corona treatment in step S2 is 1-5KW, and the treatment time is 1-5min.

[0024] Preferably, the temperature of the fluidized bed in step S3 is 285-325℃, and the airflow velocity is 0.6-1.6m / s.

[0025] Preferably, the hot pressing process in step S4 is divided into two stages. The first stage of hot pressing is performed at a temperature of 170-180℃, a pressure of 8-12MPa, and a time of 3-5min. The second stage of hot pressing is performed at a temperature of 310-330℃, a pressure of 3-5MPa, and a time of 10-15min.

[0026] Due to the application of the above technical solution, the present invention has the following beneficial effects:

[0027] (1) The preparation method of the high-performance laptop shell composite material disclosed in this invention is simple, easy to operate, low in cost, and highly repeatable. It adopts the powder impregnation method, does not require the use of organic solvents, is environmentally friendly, is suitable for continuous large-scale production, and has high promotion and application value.

[0028] (2) The high-performance laptop shell composite material disclosed in this invention is made from the following raw materials in parts by weight: 20-30 parts carbon fiber, 20-30 parts polyphenylene sulfide, 10-20 parts functional polymer, 1-3 parts coupling agent, 3-5 parts nano titanium dioxide, 1-3 parts aluminum hydroxide flame retardant, 2-4 parts catalyst A, and 3-5 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid. Through the synergistic effect of the various raw materials, the product is endowed with advantages such as good mechanical properties, excellent flame retardancy, high temperature resistance, and excellent aging resistance. Using carbon fiber as the main reinforcing material can significantly improve the strength and modulus of the composite material. Both the functional polymer and polyphenylene sulfide have excellent heat resistance, which can meet the requirements of laptops in high-temperature environments. At the same time, they have good compatibility with fiber materials. Under the catalysis of catalyst A, the sulfonic acid groups on benzidine disulfonic acid can react chemically with the benzene rings on the functional polymer and polyphenylene sulfide to form an interpenetrating network structure, thereby effectively improving the mechanical properties, flame retardancy, high-temperature resistance and aging resistance of the product.

[0029] (3) The high-performance notebook computer shell composite material disclosed in this invention includes the following monomers introducing structural units: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid; at the same time, fluorinated diphenyl sulfone, cyclohexane and amide group structures are introduced. Under the multiple effects of electronic effect, steric effect and conjugation effect, these structures can further improve the flame retardancy, high temperature resistance and aging resistance of the product, improve the interfacial compatibility with fiber materials, and thus improve the mechanical properties.

[0030] (4) The high-performance laptop shell composite material disclosed in this invention, with the addition of nano titanium dioxide and aluminum hydroxide flame retardant, not only has the properties of UV resistance and flame retardancy respectively, but also effectively improves the dimensional stability of the composite material, reduces thermal deformation, and ensures the precision and aesthetics of the laptop shell. Detailed Implementation

[0031] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0032] Example 1

[0033] A high-performance laptop casing composite material is made from the following raw materials in parts by weight: 20 parts carbon fiber, 20 parts polyphenylene sulfide, 10 parts functional polymer, 1 part coupling agent, 3 parts nano titanium dioxide, 1 part aluminum hydroxide flame retardant, 2 parts catalyst A, and 3 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid.

[0034] The carbon fiber is CO6644B carbon fiber cloth, with a thickness of 0.3 mm and a basis weight of 317 g / m. 2 The polyphenylene sulfide is sourced from Toray Industries, Inc. of Japan; the polyphenylene sulfide is model 1150C and is provided by Zhejiang NHU Co., Ltd.

[0035] The preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 120°C under normal pressure for 2 hours, followed by heating to 235°C and performing a polycondensation reaction at 100 Pa for 15 hours. The mixture is then cooled to room temperature, adjusted to normal pressure, precipitated in water, and the crude product is washed three times with ethanol. It is then dried in a vacuum drying oven at 85°C to constant weight to obtain the functional polymer. The molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling-point solvent is 1:1:0.8:9. The high-boiling-point solvent is dimethyl sulfoxide; the inert gas is nitrogen; and the catalyst B is a thiophosphonate. GPC testing shows that the M of this functional polymer... n =15530g / mol, M W / M n =1.372; Elemental quantitative analysis and weight change calculations confirmed that the molar ratio of the structural units introduced by 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid in this functional polymer is the same as the theoretical value.

[0036] The coupling agent is silane coupling agent KH550; the nano titanium dioxide has a particle size of 10 nm; the aluminum hydroxide flame retardant is aluminum oxide flame retardant VK-LA50; and the catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of 3:1.

[0037] A method for preparing the high-performance laptop computer casing composite material includes the following steps:

[0038] Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 8 minutes to obtain modified resin-based powder.

[0039] Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber.

[0040] Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface.

[0041] Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

[0042] The high-temperature heat treatment in step S2 is performed at a temperature of 400°C for 10 minutes; the corona treatment in step S2 is performed at a power of 1 kW for 1 minute.

[0043] In step S3, the temperature of the fluidized bed is 285℃ and the airflow velocity is 0.6m / s; in step S4, the hot pressing molding is divided into two stages. The first stage of hot pressing molding is at a temperature of 170℃, a pressure of 8MPa, and a time of 3min; the second stage of hot pressing molding is at a temperature of 310℃, a pressure of 3MPa, and a time of 10min.

[0044] Example 2

[0045] A high-performance laptop casing composite material is made from the following raw materials in parts by weight: 23 parts carbon fiber, 23 parts polyphenylene sulfide, 12 parts functional polymer, 1.5 parts coupling agent, 3.5 parts nano titanium dioxide, 1.5 parts aluminum hydroxide flame retardant, 2.5 parts catalyst A, and 3.5 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid.

[0046] The carbon fiber is CO6644B carbon fiber cloth, with a thickness of 0.3 mm and a basis weight of 317 g / m. 2 The polyphenylene sulfide is sourced from Toray Industries, Inc. of Japan; the polyphenylene sulfide is model 1150C and is provided by Zhejiang NHU Co., Ltd.

[0047] The preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 123°C under normal pressure for 2.5 hours. Then, the temperature is raised to 240°C and polycondensation is carried out at 150 Pa for 17 hours. After cooling to room temperature and adjusting to normal pressure, the product is precipitated in water, washed four times with ethanol, and then dried in a vacuum drying oven at 87°C to constant weight to obtain the functional polymer. The molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling-point solvent is 1:1:0.9:11. The high-boiling-point solvent is dimethyl sulfoxide. The inert gas is helium. The catalyst B is phosphorous acid.

[0048] The coupling agent is silane coupling agent KH560; the nano titanium dioxide has a particle size of 30 nm; the aluminum hydroxide flame retardant is aluminum oxide flame retardant VK-LA100; and the catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of 3.5:1.

[0049] A method for preparing the high-performance laptop computer casing composite material includes the following steps:

[0050] Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 9 minutes to obtain modified resin-based powder.

[0051] Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber.

[0052] Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface.

[0053] Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

[0054] The high-temperature heat treatment in step S2 is performed at a temperature of 450°C for 15 minutes; the corona treatment in step S2 is performed at a power of 2 kW for 2 minutes.

[0055] In step S3, the temperature of the fluidized bed is 295℃ and the airflow velocity is 0.9m / s; in step S4, the hot pressing molding is divided into two stages. The first stage of hot pressing molding is at a temperature of 173℃, a pressure of 9MPa, and a time of 3.5min; the second stage of hot pressing molding is at a temperature of 315℃, a pressure of 3.5MPa, and a time of 12min.

[0056] Example 3

[0057] A high-performance laptop shell composite material is made from the following raw materials in parts by weight: 25 parts carbon fiber, 25 parts polyphenylene sulfide, 15 parts functional polymer, 2 parts coupling agent, 4 parts nano titanium dioxide, 2 parts aluminum hydroxide flame retardant, 3 parts catalyst A, and 4 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid.

[0058] The carbon fiber is CO6644B carbon fiber cloth, with a thickness of 0.3 mm and a basis weight of 317 g / m. 2 The polyphenylene sulfide is sourced from Toray Industries, Inc. of Japan; the polyphenylene sulfide is model 1150C and is provided by Zhejiang NHU Co., Ltd.

[0059] The preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 125°C under normal pressure for 3 hours. Then, the temperature is raised to 245°C and a polycondensation reaction is carried out at 200 Pa for 19 hours. After cooling to room temperature and adjusting to normal pressure, the product is settled in water, washed five times with ethanol, and then dried in a vacuum drying oven at 90°C to constant weight to obtain the functional polymer. The molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling-point solvent is 1:1:1:12. The high-boiling-point solvent is dimethyl sulfoxide. The inert gas is neon. The catalyst B is thiophosphoramide.

[0060] The coupling agent is silane coupling agent KH570; the nano titanium dioxide has a particle size of 40 nm; the aluminum hydroxide flame retardant is aluminum oxide flame retardant VK-LA50; and the catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of 4:1.

[0061] A method for preparing the high-performance laptop computer casing composite material includes the following steps:

[0062] Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 10 minutes to obtain modified resin-based powder.

[0063] Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber.

[0064] Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface.

[0065] Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

[0066] The high-temperature heat treatment in step S2 is at a temperature of 500℃ for 20 minutes; the corona treatment in step S2 is at a power of 3KW for 3 minutes; the fluidized bed in step S3 is at a temperature of 305℃ and an airflow velocity of 1.1m / s.

[0067] The hot pressing process in step S4 is divided into two stages. The first stage of hot pressing is performed at a temperature of 175°C, a pressure of 10 MPa, and a time of 4 min. The second stage of hot pressing is performed at a temperature of 320°C, a pressure of 4 MPa, and a time of 13 min.

[0068] Example 4

[0069] A high-performance laptop casing composite material is made from the following raw materials in parts by weight: 28 parts carbon fiber, 28 parts polyphenylene sulfide, 18 parts functional polymer, 2.5 parts coupling agent, 4.5 parts nano titanium dioxide, 2.5 parts aluminum hydroxide flame retardant, 3.5 parts catalyst A, and 4.5 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid.

[0070] The carbon fiber is CO6644B carbon fiber cloth, with a thickness of 0.3 mm and a basis weight of 317 g / m. 2 The polyphenylene sulfide is sourced from Toray Industries, Inc. of Japan; the polyphenylene sulfide is model 1150C and is provided by Zhejiang NHU Co., Ltd.

[0071] The preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 128°C under normal pressure for 3.5 hours. The temperature is then raised to 250°C, and a polycondensation reaction is carried out at 250 Pa for 21 hours. The mixture is then cooled to room temperature, adjusted to normal pressure, and reacted in water. The product was precipitated, washed five times with ethanol, and then dried at 93°C in a vacuum drying oven to constant weight to obtain the functional polymer. The molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling solvent was 1:1:1.1:14. The high-boiling solvent was dimethyl sulfoxide. The inert gas was argon. The catalyst B was a mixture of thiophosphonate, phosphorous acid, and thiophosphoramide in a mass ratio of 1:2:3.

[0072] The coupling agent is a mixture of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570 in a mass ratio of 1:1:2; the nano-titanium dioxide has a particle size of 35 nm; the aluminum hydroxide flame retardant is a mixture of alumina flame retardant VK-LA50 and alumina flame retardant VK-LA100 in a mass ratio of 3:5; the catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of 4.5:1.

[0073] A method for preparing the high-performance laptop computer casing composite material includes the following steps:

[0074] Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 8-12 minutes to obtain modified resin-based powder.

[0075] Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber.

[0076] Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface.

[0077] Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

[0078] The high-temperature heat treatment in step S2 is at a temperature of 550℃ for 25 minutes; the corona treatment in step S2 is at a power of 4KW for a treatment time of 4 minutes; the fluidized bed in step S3 is at a temperature of 315℃ and an airflow velocity of 1.4m / s.

[0079] The hot pressing process in step S4 is divided into two stages. The first stage of hot pressing is performed at a temperature of 178°C, a pressure of 11 MPa, and a time of 4.5 min. The second stage of hot pressing is performed at a temperature of 325°C, a pressure of 4.5 MPa, and a time of 14 min.

[0080] Example 5

[0081] A high-performance laptop casing composite material is made from the following raw materials in parts by weight: 30 parts carbon fiber, 30 parts polyphenylene sulfide, 20 parts functional polymer, 3 parts coupling agent, 5 parts nano titanium dioxide, 3 parts aluminum hydroxide flame retardant, 4 parts catalyst A, and 5 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid.

[0082] The carbon fiber is CO6644B carbon fiber cloth, with a thickness of 0.3 mm and a basis weight of 317 g / m. 2 The polyphenylene sulfide is sourced from Toray Industries, Inc. of Japan; the polyphenylene sulfide is model 1150C and is provided by Zhejiang NHU Co., Ltd.

[0083] The preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 130°C under normal pressure for 4 hours. Then, the temperature is raised to 255°C and polycondensation is carried out at 300 Pa for 22 hours. After cooling to room temperature and adjusting to normal pressure, the product is settled in water, washed 6 times with ethanol, and then dried in a vacuum drying oven at 95°C to constant weight to obtain the functional polymer. The molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling-point solvent is 1:1:1.2:15. The high-boiling-point solvent is dimethyl sulfoxide. The inert gas is nitrogen. The catalyst B is thiophosphoramide.

[0084] The coupling agent is silane coupling agent KH550; the nano titanium dioxide has a particle size of 60 nm; the aluminum hydroxide flame retardant is aluminum oxide flame retardant VK-LA100; and the catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of 5:1.

[0085] A method for preparing the high-performance laptop computer casing composite material includes the following steps:

[0086] Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 12 minutes to obtain modified resin-based powder.

[0087] Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber.

[0088] Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface.

[0089] Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

[0090] The high-temperature heat treatment in step S2 is at a temperature of 600℃ for 30 minutes; the corona treatment in step S2 is at a power of 5KW for 5 minutes; the fluidized bed in step S3 is at a temperature of 325℃ and an airflow velocity of 1.6m / s.

[0091] The hot pressing process in step S4 is divided into two stages. The first stage of hot pressing is at a temperature of 180°C, a pressure of 12MPa, and a time of 5min. The second stage of hot pressing is at a temperature of 330°C, a pressure of 5MPa, and a time of 15min.

[0092] Comparative Example 1

[0093] A high-performance laptop shell composite material and its preparation method are basically the same as those in Example 1, except that an equal amount of polyphenylene sulfide is used instead of the functional polymer.

[0094] Comparative Example 2

[0095] A high-performance laptop shell composite material and its preparation method are basically the same as those in Example 1, except that benzidine disulfonic acid is not added.

[0096] To further illustrate the beneficial technical effects of the high-performance laptop shell composite materials involved in the various embodiments of the present invention, relevant performance tests were conducted on the high-performance laptop shell composite materials involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1, and the test methods are as follows:

[0097] (1) Oxygen index: The oxygen index was tested in accordance with GB / T 8924-2005;

[0098] (2) Tensile strength: Tensile strength test shall be conducted in accordance with GB / T 1447-2005;

[0099] (3) Heat distortion temperature: The heat distortion temperature test shall be conducted in accordance with GB / T 1634.2-2004;

[0100] (4) Aging resistance: Each product was placed in a forced-air drying oven at 85°C for 100 hours. After cooling to room temperature, the tensile strength was tested again using the method in (2). The tensile strength retention rate was statistically analyzed and calculated. The larger the value, the better the aging resistance.

[0101] Table 1

[0102] project Oxygen Index Tensile strength Heat distortion temperature Aging resistance unit ％ MPa ℃ ％ Example 1 35.8 2730 270 98.89 Example 2 36.2 2780 275 99.13 Example 3 37.0 2810 278 99.35 Example 4 37.3 2870 280 99.60 Example 5 37.8 2915 283 99.91 Comparative Example 1 34.2 2700 274 95.17 Comparative Example 2 33.6 2550 262 96.53

[0103] As can be seen from Table 1, the high-performance laptop shell composite material involved in the embodiments of the present invention has higher mechanical properties, flame retardancy, high temperature resistance and aging resistance than the comparative product; the combined use of functional polymer and benzidine disulfonic acid is beneficial to improving the above properties.

[0104] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-performance laptop computer casing composite material, characterized in that, It is made from the following raw materials in parts by weight: 20-30 parts carbon fiber, 20-30 parts polyphenylene sulfide, 10-20 parts functional polymer, 1-3 parts coupling agent, 3-5 parts nano titanium dioxide, 1-3 parts aluminum hydroxide flame retardant, 2-4 parts catalyst A, and 3-5 parts benzidine disulfonic acid; the functional polymer includes structural units introduced by the following monomers: 3,3'-diamino-4,4'-difluorodiphenyl sulfone and 1,4-cyclohexanedicarboxylic acid; the catalyst A is a mixture of phosphorus pentoxide and polyphosphoric acid in a mass ratio of (3-5):

1. The preparation method of the functional polymer includes the following steps: 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, and catalyst B are added to a high-boiling-point solvent and mixed evenly to obtain a mixture. The mixture is then added to a reaction vessel, and the air inside the vessel is replaced with an inert gas. The reaction is carried out at 120-130℃ under normal pressure for 2-4 hours. The temperature is then raised to 235-255℃, and a polycondensation reaction is carried out at 100-300 Pa for 15-22 hours. Afterward, the mixture is cooled to room temperature, adjusted to normal pressure, and precipitated in water. The crude product is washed with ethanol 3-6 times and then dried in a vacuum drying oven at 85-95℃ to constant weight to obtain the functional polymer; the molar ratio of 3,3'-diamino-4,4'-difluorodiphenyl sulfone, 1,4-cyclohexanedicarboxylic acid, catalyst B, and high-boiling solvent is 1:1:(0.8-1.2):(9-15); the high-boiling solvent is dimethyl sulfoxide; the inert gas is any one of nitrogen, helium, neon, and argon; the catalyst B is at least one of thiophosphonate, phosphorous acid, and thiophosphoramide.

2. The high-performance laptop casing composite material according to claim 1, characterized in that, The carbon fiber is CO6644B carbon fiber cloth, with a thickness of 0.3 mm and a basis weight of 317 g / m. 2 The polyphenylene sulfide is of type 1150C.

3. The high-performance laptop casing composite material according to claim 1, characterized in that, The coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570; the particle size of the nano-titanium dioxide is 10-60 nm.

4. The high-performance laptop computer casing composite material according to claim 1, characterized in that, The aluminum hydroxide flame retardant is at least one of aluminum hydroxide flame retardant VK-LA50 and aluminum hydroxide flame retardant VK-LA100.

5. A method for preparing a high-performance notebook computer casing composite material according to any one of claims 1-4, characterized in that, Includes the following steps: Step S1: Mix and grind polyphenylene sulfide, functional polymer, coupling agent, nano titanium dioxide, aluminum hydroxide flame retardant and benzidine disulfonic acid, and perform surface treatment in a high-speed mixer for 8-12 minutes to obtain modified resin-based powder. Step S2: After high-temperature heat treatment, the carbon fiber is subjected to corona treatment to obtain modified carbon fiber. Step S3: The modified resin-based powder is uniformly dispersed in a fluidized bed, and the modified carbon fiber is passed through the fluidized bed at a certain speed so that the resin-based powder is uniformly attached to the surface of the carbon fiber, thus obtaining carbon fiber with resin-based powder attached to the surface. Step S4: Place half the mass of catalyst A evenly on the lower mold surface, then cut the carbon fiber with resin-based powder attached to the surface into the required shape and lay it in the mold. Next, place the other half mass of catalyst A evenly on the carbon fiber with resin-based powder attached to the surface, close the mold, hot press to form, and after cooling and demolding, obtain a high-performance laptop shell composite material.

6. The method for preparing the high-performance laptop computer casing composite material according to claim 5, characterized in that, The high-temperature heat treatment in step S2 is performed at a temperature of 400-600℃ for 10-30 minutes; the corona treatment in step S2 is performed at a power of 1-5KW for 1-5 minutes.

7. The method for preparing the high-performance laptop computer casing composite material according to claim 5, characterized in that, The temperature of the fluidized bed in step S3 is 285-325℃, and the airflow velocity is 0.6-1.6m / s.

8. The method for preparing the high-performance laptop computer casing composite material according to claim 5, characterized in that, The hot pressing process described in step S4 is divided into two stages. The first stage of hot pressing is performed at a temperature of 170-180℃, a pressure of 8-12MPa, and a time of 3-5min. The second stage of hot pressing is performed at a temperature of 310-330℃, a pressure of 3-5MPa, and a time of 10-15min.