High-hardness engineering plastic and preparation method thereof

Abstract

The invention discloses high-hardness engineering plastic and a preparation method thereof, and relates to the technical field of polyamide materials. The preparation method comprises the following steps: 1, uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, adding the mixture into a twin-screw extruder, and carrying out melt grafting and extrusion pelletizing to obtain modified polyamide-66; step 2, carrying out modification treatment on the carbon fibers by adopting 3-aminopropyltriethoxysilane, and then carrying out amidation reaction on the modified carbon fibers and 2, 4, 6-tri [(p-carboxylphenyl) amino]-1, 3, 5-triazine to obtain modified carbon fibers; 3, uniformly mixing polyphenylene sulfide, polyamide-66, maleic anhydride and an initiator, adding the mixture into a double-screw extruder, and carrying out melt grafting and extrusion pelletizing to obtain a compatilizer; and 4, adding the raw material components of the high-hardness engineering plastic into a double-screw extruder according to the formula proportion, and carrying out melt mixing, extrusion and pelletizing to obtain the high-hardness engineering plastic.

Description

Technical Field

[0001] This invention relates to the field of polyamide materials technology, specifically a high-hardness engineering plastic and its preparation method. Background Technology

[0002] Polyamide engineering plastics, also known as nylon, are important thermoplastic engineering plastics widely used in the automotive, electronics, and machinery industries. Their excellent mechanical properties, abrasion resistance, and chemical corrosion resistance make them a preferred material for many industrial applications. However, traditional polyamide engineering plastics suffer from insufficient hardness at high temperatures, are prone to deformation, and experience aging phenomena such as thermal degradation, hydrolysis, and UV oxidation during long-term use. These problems significantly limit their application in high-performance fields.

[0003] Therefore, developing a polyamide engineering plastic with high hardness and excellent aging resistance has become a pressing technical challenge in the field of engineering plastics. Based on this, this invention prepares a high-hardness polyamide engineering plastic, which is of significant importance. Summary of the Invention

[0004] The purpose of this invention is to provide a high-hardness engineering plastic and its preparation method to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for preparing a high-hardness engineering plastic includes the following steps:

[0007] Step 1: After mixing carboxylated polytetrafluoroethylene and polyamide-66 evenly, add them into a twin-screw extruder, melt graft, extrude and pelletize to obtain modified polyamide-66;

[0008] Step 2: After modifying the carbon fiber with 3-aminopropyltriethoxysilane, it undergoes an amidation reaction with 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine to obtain modified carbon fiber;

[0009] Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and initiator evenly, add them into a twin-screw extruder, melt graft them, extrude and pelletize them to obtain a compatibilizer;

[0010] Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, crosslinking agent, antioxidant, and lubricant into a twin-screw extruder according to the formula ratio, and after melt mixing, extrusion and pelletizing, obtain high-hardness engineering plastic.

[0011] More preferably, the high-hardness engineering plastic comprises the following raw material components: by weight, 70 parts of polyamide-66, 20-30 parts of modified polyamide-66, 25-35 parts of modified carbon fiber, 15-20 parts of polyphenylene sulfide, 5-10 parts of compatibilizer, 2-4 parts of crosslinking agent, 1-2 parts of antioxidant, and 1-2 parts of lubricant.

[0012] More preferably, the method for preparing the carboxylated polytetrafluoroethylene is as follows:

[0013] (1) Polytetrafluoroethylene is subjected to plasma treatment to obtain activated polytetrafluoroethylene;

[0014] (2) After plasma treatment, the activated polytetrafluoroethylene was immediately added to a 0.3 mol / L potassium permanganate solution and stirred at 60-80℃ for 10-30 min. After filtration, washing and drying, carboxylated polytetrafluoroethylene was obtained.

[0015] More preferably, the working parameters of the plasma treatment are as follows: the discharge gas is oxygen, the gas pressure is 0.5-1 Pa, the input power is 300-500 W, the discharge voltage is 10-30 KV, the discharge frequency is 5-20 KHz, the discharge spacing is 1-2 cm, and the modification treatment time is 30-60 s.

[0016] Preferably, the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1g:20mL.

[0017] More preferably, the mass ratio of the carboxylated polytetrafluoroethylene to polyamide-66 is (0.5-1.5):(8.5-9.5).

[0018] More preferably, the modified carbon fiber is prepared by:

[0019] (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 4.5-6. The mixture was stirred for 10-30 min to obtain a silane hydrolysate.

[0020] (2) Under nitrogen protection, carbon fiber is added to silane hydrolysate and soaked for 1-2 hours. Then, it is taken out, washed, and dried to obtain aminated carbon fiber.

[0021] (3) Aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70°C for 6-12 h. After filtration, washing, and drying, modified carbon fiber was obtained.

[0022] Preferably, the mass ratio of 3-aminopropyltriethoxysilane to the ethanol solution is 1:10.

[0023] More preferably, the mass ratio of the aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:(0.3-0.5):(0.005-0.01):(0.2-0.4).

[0024] More preferably, the mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and initiator is 1:(0.2-0.3):(0.015-0.02):(0.001-0.003).

[0025] More preferably, the crosslinking agent is a bismaleimide crosslinking agent, specifically including but not limited to one or more combinations of 4,4'-diphenylmethane bismaleimide, N,N'-m-phenylene bismaleimide, N,N'-tetramethylene bismaleimide, 1,2-bis(maleimide)ethane, and N,N'-(o-phenylene)bismaleimide.

[0026] Preferably, in steps 1, 3, and 4, the operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; wherein, the temperature range of the first temperature zone is 245–250℃, the temperature range of the second temperature zone is 250–260℃, the temperature range of the third temperature zone is 255–265℃, the temperature range of the fourth temperature zone is 265–270℃, the temperature range of the fifth temperature zone is 265–275℃, the temperature range of the sixth temperature zone is 260–265℃, and the temperature range of the seventh temperature zone is 255–260℃; the extrusion temperature is 255–265℃, and the screw speed is 250–400 r / min.

[0027] More preferably, the high-hardness engineering plastic is prepared by the method described above.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0029] (1) In this invention, polytetrafluoroethylene (PTFE) is plasma-treated to activate its surface and introduce oxygen-containing active groups (carboxyl groups, hydroxyl groups, etc.). Further oxidation with potassium permanganate is then performed to oxidize the oxygen-containing active groups, such as hydroxyl groups, into carboxyl groups, thereby increasing the carboxyl content on the PTFE surface and obtaining carboxylated PTFE. Finally, carboxylated PTFE and polyamide-66 are melt-grafted, allowing the carboxyl groups of carboxylated PTFE and the amino groups of polyamide-66 to react and graft, resulting in modified polyamide-66. The reason for further oxidizing the activated PTFE is not only to increase its carboxyl content, but also to enhance the polarity of the carboxylated PTFE after oxidation, which greatly promotes its compatibility with polyamide-66, thus comprehensively improving the grafting effect of both. The modified polyamide-66 can significantly improve the heat resistance and water absorption of polyamide, thereby mitigating the defects of polyamide materials such as easy thermal degradation and hydrolysis, thus improving their aging resistance and ensuring that polyamide products maintain long-term effective high hardness. Although the compatibility between polytetrafluoroethylene and polyamide-66 is well improved after plasma treatment and oxidation treatment, the amount of carboxylated polytetrafluoroethylene incorporated should not be too high. Excessive incorporation will increase the difficulty of melt grafting and reduce the hardness of polyamide.

[0030] (2) In this invention, 3-aminopropyltriethoxysilane is used to modify carbon fibers to obtain aminated carbon fibers; then, it is subjected to an amidation reaction with 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine to obtain modified carbon fibers. The modified carbon fibers have good dispersibility in polyamide materials, which can effectively enhance the mechanical properties and heat resistance of polyamide materials; on the other hand, the triazine structure introduced on the modified carbon fibers has excellent UV resistance, thus improving the poor UV resistance of polyamide materials and further ensuring the hardness performance of polyamides; in addition, the modified carbon fibers also contain secondary amine groups, which can form hydrogen bonds with some of the amino groups on polyamide-66, which can also enhance the mechanical properties of polyamide materials to a certain extent. During the preparation process, the reaction amounts of aminated carbon fiber and 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine can be controlled to retain some carboxyl groups on the modified carbon fiber, so that they can combine with the amino groups on polyamide-66 during the subsequent melt mixing process. This can further improve the bonding force between carbon fiber and polyamide-66 and has a positive effect on improving the hardness of polyamide materials.

[0031] (3) The combination of polyphenylene sulfide and polyamide-66 can further synergistically modify polyamide-66 to improve the defects of polyamide in terms of easy thermal degradation and easy hydrolysis, and can also increase the hardness of polyamide materials to a large extent. However, the compatibility between polyphenylene sulfide and polyamide-66 is not good. Therefore, a compatibility agent was further prepared in the scheme to promote the compatibility between the two.

[0032] (4) In this invention, a bismaleimide crosslinking agent is added as a crosslinking agent. Its double bond can react with the amino group on polyamide-66 to form a crosslinking network, which has a positive effect on improving the hardness and heat resistance of polyamide materials.

[0033] (5) This invention achieves enhanced heat resistance, hydrolysis resistance, UV resistance and mechanical properties of polyamide through the synergistic effect of modified polyamide-66, modified carbon fiber, polyphenylene sulfide and bismaleimide crosslinking agent, and comprehensively prepares a high-hardness polyamide engineering plastic with excellent aging resistance. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that the following quantities are by weight, and there are no special restrictions on the suppliers of all raw materials involved in this invention. Exemplary examples include:

[0036] In the following examples, polyamide-66, model A3EG3, was purchased from Dongguan Guangyu Plastic Raw Materials Co., Ltd.

[0037] Polyphenylene sulfide, product number 15469, was purchased from Jiangsu Congzhong Chemical Co., Ltd.

[0038] Polytetrafluoroethylene (PTFE), item number A002840; carbon fiber, length 50μm, diameter 11μm; both purchased from Henan Weitixi Chemical Technology Co., Ltd.

[0039] 3-Aminopropyltriethoxysilane, purity 99%; 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, purity 98%; 4-dimethylaminopyridine, purity 98%; dicyclohexylcarbodiimide, purity 98%; 4,4'-diphenylmethane bismaleimide, purity 99%; antioxidant 703; polyethylene wax, purity 99%; all purchased from Zhengzhou Alpha Chemical Co., Ltd.; other raw materials were commercially available.

[0040] Example 1: A method for preparing a high-hardness engineering plastic:

[0041] Step 1: Preparation of modified polyamide-66:

[0042] S11: (1) Plasma treatment of polytetrafluoroethylene to obtain activated polytetrafluoroethylene; (2) Immediately after plasma treatment, the activated polytetrafluoroethylene is added to a 0.3 mol / L potassium permanganate solution, stirred and mixed at 70°C for 20 min, filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene.

[0043] S12: After uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, the mixture is added to a twin-screw extruder, melt-grafted, extruded and pelletized to obtain modified polyamide-66;

[0044] The plasma treatment parameters are as follows: discharge gas is oxygen, gas pressure is 0.8 Pa, input power is 400 W, discharge voltage is 20 KV, discharge frequency is 10 KHz, discharge spacing is 1.5 cm, and modification treatment time is 45 s; the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1 g: 20 mL; the mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is 1:9; the twin-screw extruder parameters are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0045] Step 2: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain aminated carbon fibers; (3) Aminated carbon fibers, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70 °C for 6-12 h. After filtration, washing, and drying, modified carbon fibers were obtained.

[0046] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10; the mass ratio of aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:0.4:0.0075:0.3.

[0047] Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and dicumyl peroxide evenly, add it into a twin-screw extruder, melt graft, extrude and pelletize to obtain a compatibilizer;

[0048] The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and dicumyl peroxide is 1:0.25:0.0175:0.002. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0049] Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, 4,4'-diphenylmethane bismaleimide, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0050] The high-hardness engineering plastic comprises the following raw material components: by weight, 7670 parts of polyamide-6, 25 parts of modified polyamide-6, 30 parts of modified carbon fiber, 17.5 parts of polyphenylene sulfide, 7.5 parts of compatibilizer, 3 parts of 4,4'-diphenylmethane bismaleimide, 1.5 parts of antioxidant 703, and 1.5 parts of polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0051] Example 2: A method for preparing a high-hardness engineering plastic:

[0052] Step 1: Preparation of modified polyamide-66:

[0053] S11: (1) Plasma treatment of polytetrafluoroethylene to obtain activated polytetrafluoroethylene; (2) Immediately after plasma treatment, the activated polytetrafluoroethylene is added to a 0.3 mol / L potassium permanganate solution, stirred and mixed at 70°C for 20 min, filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene.

[0054] S12: After uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, the mixture is added to a twin-screw extruder, melt-grafted, extruded and pelletized to obtain modified polyamide-66;

[0055] The plasma treatment parameters are as follows: discharge gas is oxygen, gas pressure is 0.8 Pa, input power is 400 W, discharge voltage is 20 KV, discharge frequency is 10 KHz, discharge spacing is 1.5 cm, and modification treatment time is 45 s; the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1 g: 20 mL; the mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is 0.5:9.5; the twin-screw extruder parameters are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0056] Step 2: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain aminated carbon fibers; (3) Aminated carbon fibers, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70 °C for 6-12 h. After filtration, washing, and drying, modified carbon fibers were obtained.

[0057] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10; the mass ratio of aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:0.3:0.005:0.2.

[0058] Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and dicumyl peroxide evenly, add it into a twin-screw extruder, melt graft, extrude and pelletize to obtain a compatibilizer;

[0059] The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and initiator is 1:0.2:0.015:0.001. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0060] Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, 4,4'-diphenylmethane bismaleimide, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0061] The high-hardness engineering plastic comprises the following raw material components: by weight, 7670 parts of polyamide-6, 25 parts of modified polyamide-6, 30 parts of modified carbon fiber, 17.5 parts of polyphenylene sulfide, 7.5 parts of compatibilizer, 3 parts of 4,4'-diphenylmethane bismaleimide, 1.5 parts of antioxidant 703, and 1.5 parts of polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0062] Example 3: A method for preparing a high-hardness engineering plastic:

[0063] Step 1: Preparation of modified polyamide-66:

[0064] S11: (1) Plasma treatment of polytetrafluoroethylene to obtain activated polytetrafluoroethylene; (2) Immediately after plasma treatment, the activated polytetrafluoroethylene is added to a 0.3 mol / L potassium permanganate solution, stirred and mixed at 70°C for 20 min, filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene.

[0065] S12: After uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, the mixture is added to a twin-screw extruder, melt-grafted, extruded and pelletized to obtain modified polyamide-66;

[0066] The plasma treatment parameters are as follows: discharge gas is oxygen, gas pressure is 0.8 Pa, input power is 400 W, discharge voltage is 20 KV, discharge frequency is 10 KHz, discharge spacing is 1.5 cm, and modification treatment time is 45 s; the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1 g: 20 mL; the mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is 1.5:8.5; the twin-screw extruder parameters are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0067] Step 2: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain aminated carbon fibers; (3) Aminated carbon fibers, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70 °C for 6-12 h. After filtration, washing, and drying, modified carbon fibers were obtained.

[0068] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10; the mass ratio of aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:0.5:0.01:0.4.

[0069] Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and dicumyl peroxide evenly, add it into a twin-screw extruder, melt graft, extrude and pelletize to obtain a compatibilizer;

[0070] The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and initiator is 1:0.3:0.02:0.003. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0071] Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, 4,4'-diphenylmethane bismaleimide, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0072] The high-hardness engineering plastic comprises the following raw material components: by weight, 7670 parts of polyamide-6, 25 parts of modified polyamide-6, 30 parts of modified carbon fiber, 17.5 parts of polyphenylene sulfide, 7.5 parts of compatibilizer, 3 parts of 4,4'-diphenylmethane bismaleimide, 1.5 parts of antioxidant 703, and 1.5 parts of polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0073] The following examples are based on Example 1, with comparative examples 1 to 4, as detailed below:

[0074] Comparative Example 1: Comparative Example 1 is based on Example 1, with the following adjustment: no modification was made to polyamide-66, while other processes remained unchanged. Specifically:

[0075] A method for preparing high-hardness engineering plastics:

[0076] Step 1: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain aminated carbon fibers; (3) Aminated carbon fibers, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70 °C for 6-12 h. After filtration, washing, and drying, modified carbon fibers were obtained.

[0077] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10; the mass ratio of aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:0.4:0.0075:0.3.

[0078] Step 2: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and dicumyl peroxide evenly, add it into a twin-screw extruder, melt graft, extrude and pelletize to obtain a compatibilizer;

[0079] The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and dicumyl peroxide is 1:0.25:0.0175:0.002. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0080] Step 3: Add polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, 4,4'-diphenylmethane bismaleimide, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0081] The high-hardness engineering plastic comprises the following raw material components by weight: 6695 parts polyamide-6, 30 parts modified carbon fiber, 17.5 parts polyphenylene sulfide, 7.5 parts compatibilizer, 3 parts 4,4'-diphenylmethane bismaleimide, 1.5 parts antioxidant 703, and 1.5 parts polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0082] Comparative Example 2: Comparative Example 2 is based on Example 1, with the following adjustment: only 3-aminopropyltriethoxysilane was used to modify the carbon fiber, while other processes remained unchanged. Specifically:

[0083] A method for preparing high-hardness engineering plastics:

[0084] Step 1: Preparation of modified polyamide-66:

[0085] S11: (1) Plasma treatment of polytetrafluoroethylene to obtain activated polytetrafluoroethylene; (2) Immediately after plasma treatment, the activated polytetrafluoroethylene is added to a 0.3 mol / L potassium permanganate solution, stirred and mixed at 70°C for 20 min, filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene.

[0086] S12: After uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, the mixture is added to a twin-screw extruder, melt-grafted, extruded and pelletized to obtain modified polyamide-66;

[0087] The plasma treatment parameters are as follows: discharge gas is oxygen, gas pressure is 0.8 Pa, input power is 400 W, discharge voltage is 20 KV, discharge frequency is 10 KHz, discharge spacing is 1.5 cm, and modification treatment time is 45 s; the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1 g: 20 mL; the mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is 1:9; the twin-screw extruder parameters are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0088] Step 2: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain modified carbon fibers.

[0089] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10.

[0090] Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and dicumyl peroxide evenly, add it into a twin-screw extruder, melt graft, extrude and pelletize to obtain a compatibilizer;

[0091] The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and dicumyl peroxide is 1:0.25:0.0175:0.002. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0092] Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, 4,4'-diphenylmethane bismaleimide, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0093] The high-hardness engineering plastic comprises the following raw material components: by weight, 7670 parts of polyamide-6, 25 parts of modified polyamide-6, 30 parts of modified carbon fiber, 17.5 parts of polyphenylene sulfide, 7.5 parts of compatibilizer, 3 parts of 4,4'-diphenylmethane bismaleimide, 1.5 parts of antioxidant 703, and 1.5 parts of polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0094] Comparative Example 3: Comparative Example 3 is based on Example 1, with the following adjustments: polyphenylene sulfide and compatibilizer are not added, while other processes remain unchanged. Specifically:

[0095] A method for preparing high-hardness engineering plastics:

[0096] Step 1: Preparation of modified polyamide-66:

[0097] S11: (1) Plasma treatment of polytetrafluoroethylene to obtain activated polytetrafluoroethylene; (2) Immediately after plasma treatment, the activated polytetrafluoroethylene is added to a 0.3 mol / L potassium permanganate solution, stirred and mixed at 70°C for 20 min, filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene.

[0098] S12: After uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, the mixture is added to a twin-screw extruder, melt-grafted, extruded and pelletized to obtain modified polyamide-66;

[0099] The plasma treatment parameters are as follows: discharge gas is oxygen, gas pressure is 0.8 Pa, input power is 400 W, discharge voltage is 20 KV, discharge frequency is 10 KHz, discharge spacing is 1.5 cm, and modification treatment time is 45 s; the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1 g: 20 mL; the mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is 1:9; the twin-screw extruder parameters are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0100] Step 2: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain aminated carbon fibers; (3) Aminated carbon fibers, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70 °C for 6-12 h. After filtration, washing, and drying, modified carbon fibers were obtained.

[0101] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10; the mass ratio of aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:0.4:0.0075:0.3.

[0102] Step 3: Add polyamide-66, modified polyamide-66, modified carbon fiber, 4,4'-diphenylmethane bismaleimide, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0103] The high-hardness engineering plastic comprises the following raw material components by weight: 6695 parts polyamide-6, 25 parts modified polyamide-6, 30 parts modified carbon fiber, 3 parts 4,4'-diphenylmethane bismaleimide, 1.5 parts antioxidant 703, and 1.5 parts polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0104] Comparative Example 4: Comparative Example 4 is based on Example 1, with the following adjustment: no crosslinking agent is added, while other processes remain unchanged. Specifically:

[0105] A method for preparing high-hardness engineering plastics:

[0106] Step 1: Preparation of modified polyamide-66:

[0107] S11: (1) Plasma treatment of polytetrafluoroethylene to obtain activated polytetrafluoroethylene; (2) Immediately after plasma treatment, the activated polytetrafluoroethylene is added to a 0.3 mol / L potassium permanganate solution, stirred and mixed at 70°C for 20 min, filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene.

[0108] S12: After uniformly mixing carboxylated polytetrafluoroethylene and polyamide-66, the mixture is added to a twin-screw extruder, melt-grafted, extruded and pelletized to obtain modified polyamide-66;

[0109] The plasma treatment parameters are as follows: discharge gas is oxygen, gas pressure is 0.8 Pa, input power is 400 W, discharge voltage is 20 KV, discharge frequency is 10 KHz, discharge spacing is 1.5 cm, and modification treatment time is 45 s; the ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1 g: 20 mL; the mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is 1:9; the twin-screw extruder parameters are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0110] Step 2: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 5. The mixture was stirred for 20 min to obtain a silane hydrolysate; (2) Under nitrogen protection, carbon fibers were added to the silane hydrolysate, submerged, soaked for 1.5 h, removed, washed, and dried to obtain aminated carbon fibers; (3) Aminated carbon fibers, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70 °C for 6-12 h. After filtration, washing, and drying, modified carbon fibers were obtained.

[0111] The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:10; the mass ratio of aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:0.4:0.0075:0.3.

[0112] Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and dicumyl peroxide evenly, add it into a twin-screw extruder, melt graft, extrude and pelletize to obtain a compatibilizer;

[0113] The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and dicumyl peroxide is 1:0.25:0.0175:0.002. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first temperature zone is 245℃, the temperature range of the second temperature zone is 255℃, the temperature range of the third temperature zone is 260℃, the temperature range of the fourth temperature zone is 267℃, the temperature range of the fifth temperature zone is 270℃, the temperature range of the sixth temperature zone is 264℃, and the temperature range of the seventh temperature zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0114] Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, antioxidant 703, and polyethylene wax into a twin-screw extruder according to the formula ratio. After melt mixing and extrusion molding, a high-hardness engineering plastic sample of 10cm (length) × 2cm (width) × 1cm (height) is obtained.

[0115] The high-hardness engineering plastic comprises the following raw material components: by weight, 6670 parts of polyamide-6, 25 parts of modified polyamide-6, 30 parts of modified carbon fiber, 17.5 parts of polyphenylene sulfide, 7.5 parts of compatibilizer, 1.5 parts of antioxidant 703, and 1.5 parts of polyethylene wax. The operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; the temperature range of the first zone is 245℃, the second zone is 255℃, the third zone is 260℃, the fourth zone is 267℃, the fifth zone is 270℃, the sixth zone is 264℃, and the seventh zone is 260℃; the extrusion temperature is 260℃, and the screw speed is 300 r / min.

[0116] Performance testing: The high-hardness engineering plastic samples prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to mechanical property testing, heat resistance testing, water resistance testing, and UV resistance testing. The specific testing methods are as follows:

[0117] (1) Mechanical property testing: The tensile strength and Shore hardness of the high-hardness engineering plastic samples were tested.

[0118] (2) Place the high-hardness engineering plastic sample in a high-temperature chamber. The high-temperature chamber is heated to 150°C at a heating rate of 4°C / min. After 12 hours, take out the high-hardness engineering plastic sample and immediately test its tensile strength.

[0119] (3) Place the high-hardness engineering plastic sample in an environment of 80°C and 95% humidity for 48 hours, then take out the high-hardness engineering plastic sample and immediately test its tensile strength.

[0120] (4) Use a UVA-340 (Type 1A) lamp to simulate natural light and irradiate the high-hardness engineering plastic for 240 hours. Then take out the high-hardness engineering plastic sample and immediately test its tensile strength.

[0121] The test results for the above test items are shown in Table 1 below:

[0122] Table 1

[0123]

[0124]

[0125] Results Analysis: As can be seen from the data of Examples 1-3 and Comparative Examples 1-4 in Table 1 above, the present invention achieves enhanced heat resistance, hydrolysis resistance, UV resistance and mechanical properties of polyamide through the synergistic effect of modified polyamide-66, modified carbon fiber, polyphenylene sulfide and bismaleimide crosslinking agent, and comprehensively prepares a high-hardness polyamide engineering plastic with excellent aging resistance.

[0126] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a high-hardness engineering plastic, characterized in that: Includes the following steps: Step 1: After mixing carboxylated polytetrafluoroethylene and polyamide-66 evenly, add them into a twin-screw extruder, melt graft, extrude and pelletize to obtain modified polyamide-66; Step 2: After modifying the carbon fiber with 3-aminopropyltriethoxysilane, it undergoes an amidation reaction with 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine to obtain modified carbon fiber; Step 3: After mixing polyphenylene sulfide, polyamide-66, maleic anhydride and initiator evenly, add them into a twin-screw extruder, melt graft them, extrude and pelletize them to obtain a compatibilizer; Step 4: Add polyamide-66, modified polyamide-66, modified carbon fiber, polyphenylene sulfide, compatibilizer, crosslinking agent, antioxidant, and lubricant into a twin-screw extruder according to the formula ratio, and after melt mixing, extrusion and pelletizing, obtain high-hardness engineering plastic.

2. The method for preparing a high-hardness engineering plastic according to claim 1, characterized in that: Includes the following steps: The method for preparing the carboxylated polytetrafluoroethylene is as follows: (1) Polytetrafluoroethylene is subjected to plasma treatment to obtain activated polytetrafluoroethylene; (2) After plasma treatment, the activated polytetrafluoroethylene was immediately added to a 0.3 mol / L potassium permanganate solution and stirred at 60-80°C for 10-30 min. The mixture was then filtered, washed, and dried to obtain carboxylated polytetrafluoroethylene. The working parameters of the plasma treatment are as follows: the discharge gas is oxygen, the gas pressure is 0.5-1 Pa, the input power is 300-500 W, the discharge voltage is 10-30 KV, the discharge frequency is 5-20 KHz, the discharge spacing is 1-2 cm, and the modification treatment time is 30-60 s. The ratio of activated polytetrafluoroethylene to acidic potassium permanganate solution is 1g:20mL.

3. The method for preparing a high-hardness engineering plastic according to claim 1, characterized in that: The mass ratio of carboxylated polytetrafluoroethylene to polyamide-66 is (0.5-1.5):(8.5-9.5).

4. The method for preparing a high-hardness engineering plastic according to claim 1, characterized in that: The method for preparing the modified carbon fiber is as follows: (1) Under nitrogen protection, 3-aminopropyltriethoxysilane was added to a 75% ethanol solution, and acetic acid was added to adjust the pH of the solution to 4.5-6. The mixture was stirred for 10-30 min to obtain a silane hydrolysate. (2) Under nitrogen protection, carbon fiber is added to silane hydrolysate and soaked for 1-2 hours. Then, it is taken out, washed, and dried to obtain aminated carbon fiber. (3) Aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide were added to N,N-dimethylformamide and stirred at 60-70°C for 6-12 h. After filtration, washing, and drying, modified carbon fiber was obtained. The mass ratio of 3-aminopropyltriethoxysilane to the ethanol solution is 1:

10. The mass ratio of the aminated carbon fiber, 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine, 4-dimethylaminopyridine, and dicyclohexylcarbodiimide is 10:(0.3-0.5):(0.005-0.01):(0.2-0.4).

5. The method for preparing a high-hardness engineering plastic according to claim 1, characterized in that: The mass ratio of polyphenylene sulfide, polyamide-66, maleic anhydride, and initiator is 1:(0.2-0.3):(0.015-0.02):(0.001-0.003).

6. The method for preparing a high-hardness engineering plastic according to claim 1, characterized in that: In steps 1, 3, and 4, the operating parameters of the twin-screw extruder are as follows: the twin-screw extruder is divided into 7 temperature zones; wherein, the temperature range of the first temperature zone is 245–250℃, the temperature range of the second temperature zone is 250–260℃, the temperature range of the third temperature zone is 255–265℃, the temperature range of the fourth temperature zone is 265–270℃, the temperature range of the fifth temperature zone is 265–275℃, the temperature range of the sixth temperature zone is 260–265℃, and the temperature range of the seventh temperature zone is 255–260℃; the extrusion temperature is 255–265℃, and the screw speed is 250–400 r / min.

7. The high-hardness engineering plastic prepared by the method of preparing a high-hardness engineering plastic according to any one of claims 1 to 6.

8. A high-hardness engineering plastic according to claim 7, characterized in that: The high-hardness engineering plastic comprises the following raw material components: by weight, 70 parts of polyamide-66, 20-30 parts of modified polyamide-66, 25-35 parts of modified carbon fiber, 15-20 parts of polyphenylene sulfide, 5-10 parts of compatibilizer, 2-4 parts of crosslinking agent, 1-2 parts of antioxidant, and 1-2 parts of lubricant.

9. A high-hardness engineering plastic according to claim 8, characterized in that: The crosslinking agent is a bismaleimide crosslinking agent, specifically including one or more combinations of 4,4'-diphenylmethane bismaleimide, N,N'-m-phenylene bismaleimide, N,N'-tetramethylene bismaleimide, 1,2-bis(maleimide)ethane, and N,N'-(o-phenylene)bismaleimide.

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