Thermoplastic polyimide composite material and method of making and article

Abstract

The present application relates to a kind of thermoplastic polyimide composite and its preparation method, part, belong to the technical field of polymer compound composition.The thermoplastic polyimide composite of the present application includes the following components by weight fraction: thermoplastic polyimide 40~70 parts, semi-aromatic nylon 30~60 parts, compatible agent 3~6 parts;The compatible agent is maleic anhydride grafted polyetherimide.The thermoplastic polyimide composite has good mechanical properties and excellent wear resistance at high temperature.

Description

Technical Field

[0001] This invention relates to the field of polymer composition technology, specifically to a thermoplastic polyimide composite material and its preparation method and components. Background Technology

[0002] Thermoplastic polyimide (TPI) possesses excellent high-temperature resistance, with a long-term service temperature stable between 200°C and 260°C and a short-term temperature resistance reaching 350°C to 400°C, capable of withstanding instantaneous high-temperature impacts under extreme conditions. However, TPI exhibits relatively large shrinkage during high-temperature processing and cooling, and may also exhibit anisotropy, limiting its applications in impact-resistant scenarios and complex molding processes. High-temperature resistant nylon is a special type of nylon with an aromatic ring structure (such as PA6T and PA10T), possessing good high-temperature resistance while also exhibiting excellent melt flowability. It can be used to improve the molding and processing performance of thermoplastic polyimide, enabling the fabrication of complex structural parts through conventional injection molding processes. However, in practical applications, it has been found that delamination or agglomeration easily occurs after melt blending of the two, resulting in poor mechanical properties and wear resistance of the composite material at high temperatures. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a thermoplastic polyimide composite material, its preparation method, and its components.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a thermoplastic polyimide composite material, comprising the following components by weight: 40-70 parts of thermoplastic polyimide, 30-60 parts of semi-aromatic nylon, and 3-6 parts of compatibilizer; wherein the compatibilizer is maleic anhydride-grafted polyetherimide.

[0005] This invention uses maleic anhydride-grafted polyetherimide as a compatibilizer in thermoplastic polyimide / semi-aromatic nylon systems, enabling thermoplastic polyimide composites to possess good mechanical properties and excellent high-temperature wear resistance at both room temperature and high temperature.

[0006] Based on the total mass of the thermoplastic polyimide composite material, the mass percentage of the thermoplastic polyimide is 35% or more, preferably 36% to 68%.

[0007] In some embodiments, the weight parts of thermoplastic polyimide in the thermoplastic polyimide composite material may be, but are not limited to, any one or any two of the following: 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 ​​parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, and 70 parts.

[0008] In some embodiments, the weight parts of semi-aromatic nylon in the thermoplastic polyimide composite material may be, but are not limited to, any one or any two of the following values: 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 ​​parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, and 60 parts.

[0009] In some embodiments, the weight parts of the compatibilizer in the thermoplastic polyimide composite material may be, but are not limited to, any one or any two of the following values: 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, and 6 parts.

[0010] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, it comprises the following components by weight: 50-60 parts of thermoplastic polyimide, 40-50 parts of semi-aromatic nylon, and 4-5 parts of compatibilizer.

[0011] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the total content of active groups of the semi-aromatic nylon is ≥50mol / t, preferably 80mol / t to 150mol / t, and more preferably 82mol / t to 139mol / t.

[0012] In some embodiments, the total content of active groups in the semi-aromatic nylon may be, but is not limited to, 50 mol / t, 55 mol / t, 60 mol / t, 65 mol / t, 70 mol / t, 75 mol / t, 80 mol / t, 82 mol / t, 84 mol / t, 86 mol / t, 88 mol / t, 90 mol / t, 92 mol / t, 94 mol / t, 96 mol / t, 98 mol / t, 100 mol / t, 102 mol / t, 104 mol / t, 106 mol / t, 108 mol / t. The range of any one or any two of the following values: 110 mol / t, 112 mol / t, 114 mol / t, 116 mol / t, 118 mol / t, 120 mol / t, 122 mol / t, 124 mol / t, 126 mol / t, 128 mol / t, 130 mol / t, 132 mol / t, 134 mol / t, 136 mol / t, 138 mol / t, 140 mol / t, 142 mol / t, 144 mol / t, 146 mol / t, 148 mol / t, and 150 mol / t.

[0013] The total content of active groups in semi-aromatic nylon is the total content of terminal amino and terminal carboxyl groups.

[0014] By controlling the total content of active groups in semi-aromatic nylon within the above range, it is more conducive to constructing a dense, continuous, and high-strength interfacial cross-linking layer between the thermoplastic polyimide phase and the semi-aromatic nylon phase. This not only improves the mechanical properties of the composite material but also reduces the risk of the semi-aromatic nylon phase being pulled out or detached during friction, thereby giving the composite material superior wear resistance.

[0015] The total content of active groups (carboxyl group content + amino group content) in semi-aromatic nylon can be determined by potentiometric titration. The carboxyl content in semi-aromatic nylon was tested using a ZD-2 fully automatic potentiometric titrator from Shanghai Instrument & Electronics Scientific Instrument Co., Ltd. The specific method included: taking 0.5g of semi-aromatic nylon in a container, adding 50mL of o-cresol, refluxing to dissolve, and titrating the end carboxyl content with a standardized KOH solution (concentration of 0.05mol / L).

[0016] The amino content in semi-aromatic nylon was tested using a ZD-2 fully automatic potentiometric titrator from Shanghai Instrument & Electronics Scientific Instrument Co., Ltd. The specific method included: taking 0.5g of semi-aromatic nylon in a container, adding 50mL of phenol, refluxing to dissolve, and titrating the amino content with a standardized HCl solution (concentration of 0.04mol / L).

[0017] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the grafting rate of the maleic anhydride-grafted polyetherimide is 0.5% to 3.5%, preferably 2% to 3%.

[0018] In some embodiments, the grafting rate of maleic anhydride-grafted polyetherimide may be, but is not limited to, a range of any one or any two of 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, and 3.5%.

[0019] By controlling the grafting rate of maleic anhydride-grafted polyetherimide within the above range, it is more beneficial to improve the room temperature and high temperature mechanical properties and enhance the high temperature wear resistance of thermoplastic polyimide composites.

[0020] In a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the particle size D50 of the thermoplastic polyimide (powder) is greater than or equal to the particle size D50 of the semi-aromatic nylon (powder).

[0021] By controlling the particle size D50 of thermoplastic polyimide and the particle size D50 of semi-aromatic nylon to satisfy the above relationship, it is more conducive to the uniform dispersion of thermoplastic polyimide and semi-aromatic nylon during the mixing process, thereby promoting the formation of a continuous phase when the two melt.

[0022] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the particle size D50 of the thermoplastic polyimide (powder) is ≤35μm, preferably 5μm to 35μm.

[0023] In some embodiments, the particle size D50 of the thermoplastic polyimide (powder) may be, but is not limited to, a range of any or both of the following: 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, and 35 μm.

[0024] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the particle size D50 of the semi-aromatic nylon (powder) is ≤50μm, preferably 15μm to 50μm.

[0025] In some embodiments, the particle size D50 of the semi-aromatic nylon (powder) may be, but is not limited to, a range of any one or any two of the following: 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, 40 μm, 41 μm, 42 μm, 43 μm, 44 μm, 45 μm, 46 μm, 47 μm, 48 μm, 49 μm, and 50 μm.

[0026] The particle size D50 of thermoplastic polyimide (powder) and semi-aromatic nylon (powder) can be determined with reference to GB / T 19077.1-2008 "Particle size analysis by laser diffraction".

[0027] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the relative viscosity of the thermoplastic polyimide is 1.1 to 1.4, for example, but not limited to any one or any two of 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4.

[0028] The relative viscosity of thermoplastic polyimide can be determined according to standard ISO 307:2019 "Plastics - Determination of viscosity of dilute solutions of polyamide". The test solvent is m-cresol, the sample concentration is 0.125 g / 25 mL, the test temperature is 25 ± 0.1 ℃, and the outflow time t0 of the pure solvent and the outflow time t of the sample solution are determined using an Ubbelohde viscometer. The relative viscosity η = t / t0.

[0029] As a preferred embodiment of the thermoplastic polyimide composite material of the present invention, the thermoplastic polyimide composite material further includes 0.8 to 1.2 parts by weight of antioxidant and 0.5 to 1 part by weight of lubricant.

[0030] In some embodiments, the weight percentage of the antioxidant in the thermoplastic polyimide composite material may be, but is not limited to, any one or both of the following: 0.8 parts, 0.9 parts, 1 part, 1.1 parts, and 1.2 parts. The antioxidant may be selected with reference to existing technologies, such as, but not limited to, phenolic antioxidants, phosphite antioxidants, divalent sulfur antioxidants, hindered amine antioxidants, etc.

[0031] Exemplary examples include, but are not limited to, 2,6-di-tert-butyl-4-methylphenol (antioxidant 264), pentaerythritol tetrakis[β(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine (antioxidant 1098), n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1076), and benzene. At least one of the following: vinyl phenol (antioxidant SP), 2,2'-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane (antioxidant CA), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (antioxidant 330), and 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) (antioxidant 3114).

[0032] For example, the phosphite antioxidants include, but are not limited to, at least one of tris(nonylphenyl) phosphite (antioxidant TNP), antioxidant ODP (the reaction product of N-phenylaniline and 2,4,4-trimethylpentene), tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168), bis(4-octylphenol) diphosphate (antioxidant 1093), and diethyl 3,5-di-tert-butyl-4-hydroxybenzoate (antioxidant 1222).

[0033] For example, the divalent sulfur antioxidant includes, but is not limited to, dilaurate thiodipropionate (DLTP) and / or distearate thiodipropionate (DSTP).

[0034] For example, the hindered amine antioxidant includes, but is not limited to, at least one of LS-744, bis-2,2,6,6-tetramethylpiperidinol sebacate (such as LS-770), tris(1,2,2,6,6-pentamethylpiperidinol) phosphite (GW-540), and FlamstabNOR116.

[0035] In some embodiments, the weight percentage of the lubricant in the thermoplastic polyimide composite material may be, but is not limited to, any one or any two of the following values: 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, and 1 part; the lubricant may be selected with reference to existing technology, such as, but not limited to, low molecular weight esters, metal soaps, stearic acid complex esters, amides, etc.

[0036] For example, the low molecular weight lipids include, but are not limited to, at least one of solid paraffin, liquid paraffin, and low molecular weight polyolefin wax.

[0037] For example, the metal soaps include, but are not limited to, at least one of calcium stearate, magnesium stearate, zinc stearate, and barium stearate.

[0038] For example, the stearic acid complex esters include, but are not limited to, at least one of ethylene glycol stearate, glyceryl stearate, and pentaerythritol stearate.

[0039] For example, the amides include, but are not limited to, at least one of erucamide, methyl bis-stearamide, and N,N-ethylene bis-stearamide.

[0040] Secondly, the present invention provides a method for preparing a thermoplastic polyimide composite material, comprising the following steps: mixing the components uniformly and melting and extruding to obtain a thermoplastic polyimide composite material.

[0041] In some embodiments, a twin-screw extruder can be used for melt extrusion at a temperature of 280°C to 350°C and a screw speed of 200 rpm to 300 rpm.

[0042] Thirdly, the present invention provides a component comprising the above-described thermoplastic polyimide composite material.

[0043] In some embodiments, the parts can be manufactured using injection molding; for example, the parts include, but are not limited to, automotive engine peripherals, engine bearings, electronic sliding contacts, and other components that have high requirements for high-temperature load-bearing capacity, wear resistance, and molding stability.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses maleic anhydride-grafted polyetherimide as a compatibilizer in thermoplastic polyimide / semi-aromatic nylon systems, enabling thermoplastic polyimide composites to possess good mechanical properties and excellent high-temperature wear resistance at both room temperature and high temperature. Detailed Implementation

[0045] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0046] Unless otherwise specified, all other materials, reagents, etc. used in the examples and comparative examples are commercially available.

[0047] 1. Raw materials and reagents 1) Thermoplastic polyimide (TPI) TPI-1, particle size D50=30μm, relative viscosity is 1.30; TPI-2, particle size D50=20μm, relative viscosity is 1.30; TPI-3, particle size D50=10μm, relative viscosity 1.30; TPI-4, particle size D50=30μm, relative viscosity is 1.25; TPI-1, TPI-2, and TPI-3 were obtained by grinding and sieving Ultem1010 particles provided by Sabic; TPI-4 was obtained by grinding and sieving Ultem1000 particles provided by Sabic.

[0048] TPI-5 is a maleic anhydride-modified TPI, obtained by melt extrusion of Ultem1010 particles (TPI particles) provided by Sabic with maleic anhydride and an initiator, specifically including the following steps: S1. Raw material drying: Place TPI granules in a vacuum drying oven and vacuum dry at 150℃ for 4 hours, controlling the moisture content to ≤0.08%; S2. Preparation of premix: 100 parts by weight of dried TPI particles, 2.0 parts by weight of maleic anhydride, and 0.2 parts by weight of initiator dicumyl peroxide (DCP) are added to a high-speed mixer and mixed at 2000 r / min for 8 min to obtain a premix. S3. Melt grafting: The premixed material is fed into a parallel twin-screw extruder. The extrusion temperature is set as follows: Zone 1 280℃, Zone 2 300℃, Zone 3 320℃, Zone 4 330℃, Die head temperature 310℃, Screw speed 250rpm, Vacuum degree ≤-0.09MPa, and melt extrusion is performed to obtain maleic anhydride modified TPI particles (TPI-5) with a grafting rate of approximately 2%.

[0049] 2) Semi-aromatic nylon and aliphatic nylon PA6T-1, with a particle size D50 of 40 μm and an active group content of 82 mol / t, was obtained by drying PA6T (brand name Grivory® HT1VA, manufacturer EMS) after being treated with 130W argon plasma for 9 min. PA6T-2, with a particle size D50 of 30 μm and an active group content of 82 mol / t, is obtained by grinding and sieving PA6T-1. PA6T-3, with a particle size D50 of 20μm and an active group content of 82mol / t, is obtained by grinding and sieving PA6T-1. PA6T-4, with a particle size D50=40μm and an active group content of 113mol / t, was obtained by drying PA6T after being treated with 130W argon plasma for 12min. PA6T-5, with a particle size D50=40μm and an active group content of 139mol / t, is obtained by drying PA6T after treatment with 130W argon plasma for 15min. PA10T, particle size D50=45μm, active group content 87mol / t; PA10T powder is prepared by the following method: S1. Weigh decanediamine and terephthalic acid in a molar ratio of 1.02:1, add deionized water to prepare a nylon salt solution with a mass concentration of 60%, and stir at room temperature for 30 minutes until the mixture is homogeneous. S2. Transfer the above nylon salt solution into a high-pressure reactor, heat it to 230°C under a nitrogen atmosphere, control the pressure inside the reactor at 2.0 MPa, and carry out the prepolymerization reaction at a constant temperature and pressure for 2.5 hours. S3. After prepolymerization is completed, slowly release the gas to normal pressure, continue to heat to 270℃, and polycondense in the molten state for 3 hours. During this period, continuously evacuate to -0.09MPa to remove the small molecule water generated in the reaction. S4. After the polycondensation reaction is completed, the molten product is extruded and granulated, dried under vacuum at 120°C for 12 hours, then processed by liquid nitrogen cryogenic pulverization, and finally sieved through a standard sieve to obtain PA10T powder.

[0050] PA6, with a particle size D50=40μm and an active group content of 75mol / t, is obtained by drying PA6 powder (grade YH800, manufactured by Yueyang Baling Petrochemical) after treatment with 130W argon plasma for 10min.

[0051] 3) Compatibilizers and surface modifiers Compatibilizer 1 is MAH-g-PEI, with a grafting rate of 2.2%, brand name EP2, and manufacturer: KOS Chemical Co., Ltd. Compatibilizer 2 is MAH-g-PEI, with a grafting rate of 0.6%, brand name EP3, and manufacturer: KOS Chemical Co., Ltd. Compatibilizer 3 is MAH-g-POE, with a grafting rate of 1.5%, brand name W1, and manufacturer: KOS Chemical Co., Ltd. The surface modifier is sodium dodecyl sulfonate, which is commercially available.

[0052] 4) Antioxidants The antioxidant is obtained by compounding antioxidant 1010 (commercially available) and antioxidant (168) in a mass ratio of 1:1.

[0053] 5) Lubricant The lubricant is ethylene bis-stearamide (EBS), which is commercially available.

[0054] 2. Preparation method of the thermoplastic polyimide composite material of the present invention According to the formula, each component is added to a high-speed mixer and mixed evenly to obtain a premix; then the premix is ​​added to a twin-screw extruder (screw speed: 260 r / min; extrusion temperature: zone 1 (feed section) 280℃, zone 2 (melting section) 320℃, zone 3 (mixing section) 340℃, zone 4 (homogenization section) 350℃, die head temperature 320℃; vacuum degree: -0.085MPa), melt extruded, and then cooled with water and pelletized to obtain a thermoplastic polyimide composite material.

[0055] 3. Performance Testing The thermoplastic polyimide composites in the above embodiments and comparative examples were subjected to the following performance tests.

[0056] 1) Compressive strength at 200℃: Tested according to ISO 604:2002 standard. The sample was prepared into specimens with a diameter of 10±0.2mm and a height of 20±0.2mm. It was pretreated for more than 16 hours at a temperature of 23±2℃ and a relative humidity of 50±5%. The specimen and fixture were placed in a high-temperature oven and kept at 200℃ for 30 minutes. The test was performed using an electronic universal testing machine with a loading rate of 2mm / min.

[0057] 2) Impact strength at 200℃: Tested according to ISO 180 / 1A:2020 standard. Prepare 80mm×10mm×4mm V-notch specimens, pre-treat at 23±2℃ and 50±5%RH for at least 16 hours, and hold at 200℃ for 30 minutes during the high-temperature test. Use a simply supported beam impact testing machine with a pendulum energy of 5.5J and an impact velocity of 2.9m / s. Record the impact absorbed energy and calculate the impact strength (kJ / m²). 2 ).

[0058] 3) Friction coefficient at 200℃: According to ISO8295:2019 standard, 63mm×63mm upper sample and 100mm×100mm lower sample were prepared and pretreated in an environment of 23±2℃ and 50±5%RH for more than 16 hours. The samples were then kept at 200℃ for 30 minutes under high temperature conditions. A friction coefficient measuring instrument was used with a loading mass of 200g, a sliding speed of 100mm / min, and a sliding distance of 70mm to calculate the static and dynamic friction coefficients.

[0059] 4) Wear rate at 200℃: Tested according to ISO 7148-2:2020 pin-disc method. The pin sample is a Φ5mm×25mm cylinder, and the disk sample is GCr15 steel with a hardness ≥55HRC (Ra 0.2~0.4μm). The sample pretreatment is the same as before. The high-temperature test is conducted at 200℃ for 30min. The normal load is set to 100N, the sliding speed is 0.5m / s, and the wear time is 1h. The mass loss of the sample is measured by analytical balance, and the volumetric wear rate [m] is calculated according to the formula. 3 / (N⋅m)].

[0060] 5) Room temperature tensile strength: In accordance with ISO 527-2:2012, 1BA type standard tensile specimens were prepared, pretreated for 16 hours at 23±2℃ and 50±5% RH, and tested using an electronic universal testing machine at a tensile speed of 5 mm / min. The tensile strength was recorded.

[0061] Table 1 shows the weight parts and properties of each component in the thermoplastic polyimide composites in Examples 1 to 5. Table 2 shows the weight parts and properties of each component in the thermoplastic polyimide composites in Examples 6 to 10. Table 3 shows the weight parts and properties of each component in the thermoplastic polyimide composites in Examples 11 to 14. Table 4 shows the weight parts and properties of each component in the thermoplastic polyimide composites of Comparative Examples 1 to 5. The " / " in Tables 1, 2, 3 and 4 indicates that there are no relevant parameters.

[0062] According to the data in Tables 1 to 4, the compressive strength of the thermoplastic polyimide composites in Examples 1 to 14 is ≥120MPa at 200℃ and the impact strength at 200℃ is ≥5.2kJ / m. 2 The coefficient of friction at 200℃ is ≤0.34 and the wear rate at 200℃ is ≤3.2×10. -6 mm 3 The tensile strength at room temperature is ≥95MPa / Nm, indicating that the thermoplastic polyimide composite material of the present invention has good mechanical properties and excellent high-temperature wear resistance at both room temperature and high temperature.

[0063] According to Examples 1 and Comparative Examples 1 to 3, it can be found that using plasma-treated PA6, using MAH-g-POE as a compatibilizer, or using surface modifiers from the prior art to replace the compatibilizer are all difficult to effectively improve the mechanical properties and high-temperature wear resistance of the composite material at room temperature and high temperature. According to Comparative Example 4, it can be seen that replacing TPI-1 with maleic anhydride-grafted modified TPI-5 and removing the compatibilizer component also deteriorates the mechanical properties and high-temperature wear resistance of the composite material at room temperature and high temperature. According to Comparative Example 5, it can also be found that when the mass proportion of semi-aromatic nylon in the thermoplastic polyimide composite material is too large, it is also not conducive to improving the performance of the composite material.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A thermoplastic polyimide composite material, characterized in that, By weight, it comprises the following components: 40-70 parts of thermoplastic polyimide, 30-60 parts of semi-aromatic nylon, and 3-6 parts of compatibilizer; wherein the compatibilizer is maleic anhydride-grafted polyetherimide.

2. The thermoplastic polyimide composite material as described in claim 1, characterized in that, By weight, it includes the following components: 50-60 parts thermoplastic polyimide, 40-50 parts semi-aromatic nylon, and 4-5 parts compatibilizer.

3. The thermoplastic polyimide composite material as described in claim 1, characterized in that, The total content of active groups in the semi-aromatic nylon is ≥50mol / t.

4. The thermoplastic polyimide composite material as described in claim 3, characterized in that, The total content of active groups in the semi-aromatic nylon is 80 mol / t to 150 mol / t.

5. The thermoplastic polyimide composite material as described in claim 1, characterized in that, The grafting rate of the maleic anhydride-grafted polyetherimide is from 0.5% to 3.5%.

6. The thermoplastic polyimide composite material according to claim 1, characterized in that, The particle size D50 of the thermoplastic polyimide is greater than or equal to the particle size D50 of the semi-aromatic nylon.

7. The thermoplastic polyimide composite material according to claim 1, characterized in that, The particle size D50 of the thermoplastic polyimide is ≤35μm; and / or the particle size D50 of the semi-aromatic nylon is ≤50μm.

8. The thermoplastic polyimide composite material as described in claim 1, characterized in that, The relative viscosity of the thermoplastic polyimide is 1.1 to 1.

4.

9. A method for preparing the thermoplastic polyimide composite material according to any one of claims 1 to 8, characterized in that, Includes the following steps: The components are mixed evenly, melted, and extruded to obtain a thermoplastic polyimide composite material.

10. A component, characterized in that, The thermoplastic polyimide composite material according to any one of claims 1 to 8.

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