A PPSU / PPS composite alloy material and its preparation method

Abstract

This invention provides a PPSU / PPS composite alloy material and its preparation method, relating to the field of polymer materials technology. The PPSU / PPS composite alloy material comprises 50-70 parts polyphenylene sulfone, 15-35 parts polyphenylene sulfide, 1-3 parts interface modifier, 10-30 parts chopped glass fibers, and 0.2-0.5 parts antioxidant; wherein the interface modifier is a carbon-modified nano-metal oxide; and the orientation degree of the chopped glass fibers in the PPSU / PPS composite alloy material is ≥80%. By adding a carbon-modified nano-metal oxide, the interfacial properties of PPSU / PPS are improved, further reducing the processing viscosity of the composite alloy material. Simultaneously, the addition of chopped glass fibers and their high orientation degree in the PPSU / PPS composite alloy material further enhances its tensile and flexural strength.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically to a PPSU / PPS composite alloy material and its preparation method. Background Technology

[0002] Polyphenylene sulfone (PPSU) is widely used in high-end engineering plastics due to its excellent thermal stability, mechanical strength, and flame retardancy. However, its high viscosity makes processing difficult, and its high water absorption rate easily leads to material performance degradation. In existing technologies, polyphenylene sulfide (PPS) is added to improve processing flowability, but PPS and PPSU have poor compatibility, easily leading to phase separation and a decrease in mechanical properties. Although adding chopped glass fiber can partially compensate for the strength loss, the following problems still exist: 1. Insufficient phase separation control: In traditional processes, glass fiber is only physically filled, failing to effectively improve the PPSU / PPS interface bonding; 2. Limited heat resistance: Single antioxidants (such as P-EPQ) lack long-term stability at extreme processing temperatures; 3. Lack of overall performance balance: Existing formulations cannot simultaneously optimize viscosity, water absorption rate, and strength.

[0003] Therefore, there is a need to provide a PPSU / PPS composite alloy material with excellent overall performance. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings of existing PPSU / PPS composite alloy materials by providing a material that combines excellent processing performance, low water absorption, and high mechanical strength. This invention improves the interfacial properties of PPSU / PPS by adding carbon-modified nano-metal oxides as an interface modifier, further reducing the processing viscosity of the composite alloy material. Simultaneously, the addition of chopped glass fibers with high orientation within the PPSU / PPS composite alloy material further enhances its tensile and flexural strength.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a PPSU / PPS composite alloy material, comprising the following components in parts by weight:

[0007] 50-70 parts polyphenylene sulfone, 15-35 parts polyphenylene sulfide, 1-3 parts interface modifier, 10-30 parts chopped glass fiber, 0.2-0.5 parts antioxidant;

[0008] The interface modifier is a carbon-modified nano-metal oxide; in the PPSU / PPS composite alloy material, the orientation degree of the chopped glass fibers is ≥80%.

[0009] As an embodiment of the present invention, the melt flow rate of the polyphenylene sulfone at 365°C and 5kg is 10~40g / 10min.

[0010] As an embodiment of the present invention, the melt mass flow rate of the polyphenylene sulfide at 365°C and 5kg is 100~500g / 10min.

[0011] As an embodiment of the present invention, in the carbon-modified nano-metal oxide, the mass ratio of carbon material to nano-metal oxide is (1~2):1.

[0012] As an embodiment of the present invention, the carbon material modified nano-metal oxide includes at least one of nano-silicon carbide and nano-graphene oxide.

[0013] As an embodiment of the present invention, the nano-metal oxide modified with carbon materials includes at least one of nano-titanium dioxide, nano-silicon dioxide, and nano-zirconium dioxide.

[0014] As an embodiment of the present invention, the particle size D of the carbon material modified nano-metal oxide is... V 50 refers to 20~70nm.

[0015] As an embodiment of the present invention, the chopped glass fiber has a length of 3-5 mm and a diameter of 10-13 μm.

[0016] As an embodiment of the present invention, the antioxidant includes phosphite antioxidants and hindered phenolic antioxidants, and the mass ratio of phosphite antioxidants to hindered phenolic antioxidants is (0.1~0.3):(0.1~0.2).

[0017] A second aspect of the present invention provides a method for preparing the PPSU / PPS composite alloy material described in the first aspect of the present invention, comprising the following steps:

[0018] (1) After mixing polyphenylene sulfone, polyphenylene sulfide, carbon material modified nano metal oxide, and antioxidant, a mixture is obtained;

[0019] (2) Add the mixture obtained in step (1) into the main feed port of the extruder. At the same time, add short glass fibers in batches from the side feed port of the extruder. Perform gradient extrusion and granulation at a screw speed of 200~400 rpm and a temperature range of 300~340℃.

[0020] (3) After drying the extruded material prepared in step (2), it is injection molded at 120~140℃ to obtain the PPSU / PPS composite alloy material.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention improves the interfacial properties of PPSU / PPS by adding carbon-modified nano-metal oxides, thereby reducing the processing viscosity of the composite alloy. Simultaneously, the addition of chopped glass fibers to give the PPSU / PPS composite alloy a high degree of orientation further enhances the tensile and flexural strength of the PPSU / PPS composite alloy.

[0023] The PPSU / PPS composite alloy material of this invention has a viscosity ≤1800 Pa•s at 340℃, exhibiting excellent processing fluidity. Furthermore, after continuous 6-hour melt flow rate (MFR) testing at 340℃ and 5 kg, the MFR decrease rate of the PPSU / PPS composite alloy material remained within 5%, indicating good processing stability. The tensile strength is 145 MPa or higher, and the flexural strength is 218 MPa or higher, demonstrating good mechanical properties. The water absorption rate is ≤0.25%. Detailed Implementation

[0024] To better illustrate the purpose, technical solution, and advantages of this invention, specific embodiments will be used to further describe the invention below. However, these embodiments do not limit the invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in this invention are conventional reagents, methods, and equipment in this technical field. Unless otherwise specified, all reagents and materials used in this invention are commercially available.

[0025] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0026] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe features or characteristics, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0027] Unless otherwise specified, all reagents or instruments used in this invention are commercially available products.

[0028] In a first aspect, an embodiment of the present invention provides a PPSU / PPS composite alloy material comprising the following components in parts by weight:

[0029] 50-70 parts polyphenylene sulfone, 15-35 parts polyphenylene sulfide, 1-3 parts interface modifier, 10-30 parts chopped glass fiber, 0.2-0.5 parts antioxidant;

[0030] The interface modifier is a carbon-modified nano-metal oxide; in the PPSU / PPS composite alloy material, the orientation degree of the chopped glass fibers is ≥80%. The high orientation degree (≥80%) of the chopped glass fibers forms a directional microflow field during injection molding, promoting the distribution of the carbon-modified nano-metal oxide along the shear direction; at the same time, the interface modifier reduces the interfacial tension between the PPSU / PPS phases, reducing interfacial defects between the glass fiber and the resin. The three form a synergistic system of "reinforcement-compressibility-flow" to jointly optimize the overall performance.

[0031] This invention improves the interfacial properties of PPSU / PPS by adding carbon-modified nano-metal oxides, thereby reducing the processing viscosity of the composite alloy. Simultaneously, the addition of chopped glass fibers to give the PPSU / PPS composite alloy a high degree of orientation further enhances the tensile and flexural strength of the PPSU / PPS composite alloy.

[0032] The large polarity difference between polyphenylene sulfone (PPSU) and polyphenylene sulfide (PPS) leads to poor interfacial compatibility when they are directly blended. In this invention, carbon-modified nano-metal oxide is used as an interfacial modifier for PPSU and PPS: (1) On the one hand, the introduction of carbon material on the surface can neutralize the interfacial charge of PPSU and PPS through electronic conduction, reduce electrostatic repulsion, and enhance the ion conduction capacity of the interfacial region, thus inhibiting charge separation; the composite of metal oxide and carbon material can form a conductive-dielectric synergistic network, which stores and releases charge through capacitance effect, further stabilizing the interfacial potential; (2) On the other hand, the introduction of carbon material can also improve the surface roughness of nano-metal oxide, enhance interfacial bonding through "mechanical locking" effect, and reduce crystallization defects at the PPSU / PPS interface. As a "physical crosslinking point", it adsorbs PPSU and PPS molecular chains to form an interfacial transition layer on its surface. The rigid chain of PPSU and the flexible chain of PPS are entangled on its surface, which enhances the interfacial adhesion performance through van der Waals forces, while inhibiting phase separation.

[0033] In some embodiments of the present invention, the melt flow rate of the polyphenylene sulfone at 365°C and 5 kg is 10~40 g / 10 min. Commonly used injection molding grade polyphenylene sulfone (PPSU) in the art can be used in this invention. In this invention, the test method for the melt flow rate of PPSU resin refers to the standard ISO 1133-2-2011.

[0034] In some embodiments of the present invention, the melt mass flow rate of the polyphenylene sulfide (PPS) at 365°C and 5 kg is 100~500 g / 10 min. In this invention, the test method for the melt mass flow rate of the PPS resin refers to the standard ISO 1133-1-2011.

[0035] In some embodiments of the present invention, the mass ratio of carbon material to nano-metal oxide in the carbon-modified nanomaterial is (1~2):1. Within this suitable ratio range, the carbon material and nano-metal oxide can synergistically interact to form a "bipolar bridge," improving the interfacial compatibility of PPSU / PPS; it can also improve the dispersion of nano-metal oxide in the PPSU / PPS matrix, allowing them to be more uniformly distributed near the interface, thereby effectively reducing interfacial tension, enhancing the interaction between the two phases, and improving interfacial compatibility. For example, the mass ratio of carbon material to nano-metal oxide can be any ratio of 1:1, 1.5:1, 2:1, or a range between any two ratios.

[0036] In some embodiments of the present invention, the carbon material modified nano-metal oxide includes at least one of nano-silicon carbide and nano-graphene oxide. Nano-silicon carbide is a wide-bandgap semiconductor (bandgap width 2.3~3.3 eV), exhibiting weak conductivity in its intrinsic state and displaying semiconductor characteristics. Through thermal excitation, valence band electrons transition to the conduction band, generating free electrons and holes. This, in turn, enhances the ion conductivity of the interface region through electrostatic interactions, improving the interfacial bonding performance between PPSU and PPS. Nano-graphene oxide has a layered structure with functional groups such as hydroxyl and carboxyl groups on its surface. The PPS molecular chain contains a conjugated structure of alternating benzene rings and sulfur atoms. The graphite layered structure of nano-graphene oxide has delocalized large π bonds. The two can form a strong interaction through π-π stacking, which enables nano-graphene oxide to effectively adsorb PPS molecular chains. Simultaneously, the hydroxyl and carboxyl functional groups on its surface form hydrogen bonds or polar adsorption with the polar groups (-SO2-) of PPSU, bridging the PPSU and PPS phases.

[0037] In some embodiments of the present invention, the carbon material modified nano-metal oxide includes at least one of nano-titanium dioxide, nano-silicon dioxide, and nano-zirconium dioxide.

[0038] In some embodiments of the present invention, the carbon-modified nano-metal oxide is obtained by chemical covalent grafting modification, and the preparation method includes the following steps:

[0039] S1: Raw material pretreatment:

[0040] The nano-metal oxide was dispersed in anhydrous ethanol, a silane coupling agent was added, and the mixture was refluxed at 70°C for 2 hours. After centrifugation and washing, the aminated nano-metal oxide was obtained.

[0041] Carbon material was added to an acetone solution containing maleic anhydride, stirred at 80°C for 4 hours, and then centrifuged and dried to obtain carboxylated carbon material.

[0042] S2: Grafting reaction

[0043] Aminated nano-metal oxides and carboxylated carbon materials were dispersed in DMF solvent; a catalyst DCC (dicyclohexylcarbodiimide, in an amount 1.2 times the molar amount of carboxyl groups) was added, and the reaction was carried out at 110°C for 6 h under nitrogen protection; the mixture was centrifuged and washed until neutral, and then vacuum dried for 48 h to obtain the carbon material-modified nano-metal oxides.

[0044] The carbon-modified nano-metal oxides are chemically grafted and can provide both mechanical locking and electronic conduction functions at the PPSU / PPS interface.

[0045] In some embodiments of the present invention, the particle size D of the carbon-modified nano-metal oxide is... V 50 refers to 20~70nm.

[0046] In some embodiments of the present invention, the chopped glass fibers have a length of 3-5 mm and a diameter of 10-13 μm. The elastic modulus of the glass fibers (70-85 GPa) is much higher than that of PPSU (2.5-3.0 GPa) and PPS (3.5-4.0 GPa), allowing them to serve as a rigid skeleton for the PPSU / PPS composite alloy, bearing external loads and reducing matrix deformation. During injection molding, the chopped glass fibers can be better oriented along the melt flow direction, reducing their agglomeration in the PPSU / PPS composite matrix. Simultaneously, the highly oriented chopped glass fibers also act as an emulsifier and dispersant of the carbon-modified nano-metal oxides, ensuring their uniform dispersion in the PPSU / PPS composite alloy.

[0047] In this invention, in order to improve the dispersion and flowability of glass fibers in the resin matrix, a silane coupling agent can also be used to perform surface modification treatment on the chopped glass fibers.

[0048] In some embodiments of the present invention, the antioxidant includes phosphite antioxidants and hindered phenolic antioxidants, with a mass ratio of (0.1~0.3):(0.1~0.2). As a primary antioxidant, the hydrogen atoms on the phenolic hydroxyl groups in its molecule have high activity, capable of reacting with polymer peroxide free radicals, thereby abstracting free radicals, interrupting the growth of the active chain, and preventing the chain propagation of the oxidation reaction. As an auxiliary antioxidant, it can decompose peroxides into harmless stable products such as alcohols and phosphate esters, inhibiting the autocatalytic reaction initiated by peroxides. Simultaneously, phosphite antioxidants can also react with peroxide free radicals, deactivating them and further reducing the number of free radicals. Phosphite antioxidants can provide some protection to hindered phenolic antioxidants, delaying their volatilization and migration, and improving the stability and long-lasting effect of the entire antioxidant system. They can also synergistically inhibit high-temperature oxidative degradation.

[0049] In some embodiments of the present invention, the phosphite antioxidant is preferably tetrakis(2,4-di-tert-butylphenol) 4,4'-biphenyl diphosphite (P-EPQ), which has excellent high-temperature stability and still has quite good stability above 300°C.

[0050] In some embodiments of the present invention, the antioxidant may also include thioether antioxidants as needed, forming a ternary composite antioxidant system with phosphite antioxidants and hindered phenolic antioxidants, thereby further improving the antioxidant performance of the alloy material.

[0051] A second aspect of the present invention provides a method for preparing the PPSU / PPS composite alloy material described in the first aspect of the present invention, comprising the following steps:

[0052] (1) After mixing polyphenylene sulfone, polyphenylene sulfide, carbon material modified nano metal oxide, and antioxidant, a mixture is obtained;

[0053] (2) Add the mixture obtained in step (1) into the main feed port of the extruder. At the same time, add short glass fibers in batches from the side feed port of the extruder. Perform gradient extrusion and granulation at a screw speed of 200~400 rpm and a temperature range of 300~340℃.

[0054] (3) After drying the extruded material prepared in step (2), it is injection molded at 120~140℃ to obtain the PPSU / PPS composite alloy material.

[0055] In this invention, step (2) employs a gradient dispersion process, specifically by adding chopped glass fibers in stages and combining it with segmented temperature control technology to optimize the distribution and orientation of the chopped glass fibers in the resin matrix.

[0056] In some preferred embodiments of the present invention, step (2) specifically includes:

[0057] In the extruder, the extruder is divided into three zones, and the temperatures of the three zones are Zone I (300°C, feeding zone), Zone II (320°C), and Zone III (340°C), respectively.

[0058] The mixture obtained in step (1) passes through zones I, II, and III of the extruder in sequence:

[0059] Zone I (300℃): PPSU and PPS initially melt to form a low-viscosity matrix, which facilitates the subsequent impregnation of chopped glass fibers;

[0060] Zone II (320℃): The resin matrix PPSU and PPS are completely melted. 30% of the weight of the chopped glass fiber is added for the first time through the side feed port above Zone II, and the initial dispersion is achieved under the action of screw shear force.

[0061] Zone III (340℃): The remaining amount of chopped glass fiber is added twice through the side feed port above Zone III, with 40% and 30% of the weight of the chopped glass fiber added respectively, and the time interval between the two additions is 10~15s; under the action of screw shearing force, the glass fiber is promoted to be oriented along the extrusion direction.

[0062] The following are specific embodiments of the present invention.

[0063] Information on some of the raw materials used in the embodiments of the present invention is listed below. Unless otherwise specified, all raw materials are commercially available products or are prepared by conventional means in the art:

[0064] PPSU resin:

[0065] PPSU-1: Paryls® PPSU F1250, with a melt mass flow rate of 25 g / 10 min at 365℃ and 5 kg, purchased from Guangdong Youju Advanced New Materials Co., Ltd.

[0066] PPSU-2: Paryls® PPSU F1350, with a melt mass flow rate of 35 g / 10 min at 365℃ and 5 kg, purchased from Guangdong Youju Advanced New Materials Co., Ltd.

[0067] PPS resin:

[0068] PPS-1: PPS 1110C, the melt mass flow rate at 365℃ and 5kg was tested to be 100g / 10min, purchased from Zhejiang Xinhecheng Co., Ltd.

[0069] PPS-2: PPS 1130C, the melt mass flow rate at 365℃ and 5kg was tested to be 250g / 10min, purchased from Zhejiang Xinhecheng Co., Ltd.

[0070] PPS-3: PPS 1150C, the melt mass flow rate at 365℃ and 5kg was tested to be 450g / 10min, purchased from Zhejiang Xinhecheng Co., Ltd.

[0071] Short-cut glass fiber (SGF):

[0072] SGF-1: ECS10-03-568H, fiber length is 3mm, fiber diameter is 10μm, purchased from China Jushi Co., Ltd.

[0073] SGF-2: ECS 13-03-552, fiber length is 3mm, fiber diameter is 13μm, purchased from China Jushi Co., Ltd.;

[0074] Antioxidants:

[0075] Phosphite antioxidant: P-EPQ, commercially available;

[0076] Hindered phenolic antioxidant: Irganox 1010, commercially available;

[0077] Thioether antioxidants: DLTDP, commercially available;

[0078] Carbon-modified nano-metal oxides (self-made):

[0079] The types and amounts of raw materials (in parts by weight) are shown in Table 1. The preparation method includes the following steps:

[0080] (1) Aminated nano-metal oxides: The nano-metal oxides were dispersed in anhydrous ethanol and sonicated for 30 min; 2 wt% silane coupling agent KH-550 was added, and the mixture was refluxed at 70 °C for 2 h. After centrifugation and washing, the aminated nano-metal oxides were obtained.

[0081] (2) Carboxylation of carbon materials: The carbon material is added to an acetone solution containing 5 wt% maleic anhydride, stirred at 80°C for 4 h, and dried by centrifugation to obtain carboxylated carbon materials.

[0082] (3) Grafting reaction:

[0083] Aminated nano-metal oxides and carboxylated carbon materials were mixed and dispersed in DMF according to the weight ratios shown in Table 1; a catalyst DCC (dicyclohexylcarbodiimide, in an amount 1.2 times the molar amount of carboxyl groups) was added, and the reaction was carried out at 110°C for 6 h under nitrogen protection; the mixture was centrifuged and washed until neutral, and then vacuum dried for 48 h to obtain the carbon material-modified nano-metal oxides.

[0084] Table 1

[0085]

[0086] Nano titanium dioxide: XFI02, with a particle size of 15~25nm, purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.;

[0087] Micron-sized titanium dioxide: Titanium dioxide R-666, 325 mesh (<44μm), purchased from Baiyuying, Yunfu, Guangdong;

[0088] Nano-zirconia: UG-R50Y3, with a particle size of 50nm, purchased from Suzhou Youzir Nanomaterials Co., Ltd.;

[0089] Nano silica: DK-SiO2-60, with a particle size of 60nm, purchased from Adecco Island Gold;

[0090] Nano silicon carbide: 28-KK, 60,000 mesh (<25nm), purchased from Nangong Rongbang New Material Technology Co., Ltd.;

[0091] Nano-graphene oxide (NGO): UG-SY01, sheet thickness 0.3-1.2nm, sheet length 100-300nm, purchased from Suzhou Youzirconium Nanomaterials Co., Ltd.

[0092] Maleic anhydride (MA): Commercially available;

[0093] Silane coupling agent: KH-550, commercially available;

[0094] In Table 1, the particle size D of the product (carbon-modified nano-metal oxides) is... V 50 can be obtained by testing with a particle size analyzer.

[0095] Examples 1-15, Comparative Examples 1-5

[0096] A series of PPSU / PPS composite alloy materials are provided, and the raw material composition is shown in Tables 2 and 3 (the numbers represent the weight parts of the raw material). The preparation method includes the following steps:

[0097] (1) After mixing polyphenylene sulfone (PPSU), polyphenylene sulfide (PPS), carbon material modified nano metal oxide, and antioxidant, a mixture is obtained;

[0098] (2) Add the mixture obtained in step (1) into the main feed port of the extruder. The extruder is divided into three zones: Zone I, Zone II, and Zone III.

[0099] Zone I: Feeding zone, temperature set at 300℃, screw speed at 200r / min;

[0100] Zone II (containing the first side feed port): The temperature is set to 320℃, the screw speed is 300r / min, and 30wt% of the weight of the chopped glass fiber is added above the first side feed port.

[0101] The temperature of Zone III (including the second side feed port) is set to 340℃, the screw speed is 400r / min, and above the second side feed port, 40wt% and 30wt% of the weight of the chopped glass fiber are added in two batches with an interval of 10s.

[0102] Granulation at the discharge port;

[0103] It should be noted that the chopped glass fibers used in the embodiments of this application have been modified with silane coupling agent KH-550. Specifically, the chopped glass fibers are soaked in a 5wt% KH-550 solution for 20 minutes and then dried at 80°C.

[0104] (3) After drying the extruded material prepared in step (2), it is injection molded at 140°C to obtain the PPSU / PPS composite alloy material.

[0105] Table 2

[0106]

[0107] Table 3

[0108]

[0109] It should be noted that in the embodiments and comparative examples of the present invention, the test method for "length of SGF in alloy material" in Tables 2 and 3 is as follows: the test is carried out by scanning electron microscope. Within the field of view of the scanning electron microscope, five different positions are selected according to the "five-point sampling method". One glass fiber is selected at each position to measure its length, and then the average length of the five glass fibers is taken.

[0110] Performance testing

[0111] The properties of the PPSU / PPS composite alloy materials prepared in the above embodiments and comparative examples were tested as follows:

[0112] 1. Properties of PPSU / PPS composite alloy materials themselves:

[0113] (1) Porosity (%): The porosity was tested using a scanning electron microscope (SEM), specifically by observing the cross-sectional morphology of the PPSU / PPS composite alloy material;

[0114] (2) Orientation degree (%) of chopped glass fibers in PPSU / PPS composite alloy material: tested using X-ray computed tomography (Micro-CT);

[0115] 2. Processing stability

[0116] (1) The thermal decomposition temperature (Td) was determined by thermogravimetric analysis (TGA) in accordance with the standard ISO 11358-1:2022. s (℃), with a heating rate of 10℃ / min;

[0117] (2) Refer to the standard "ISO 6721-11:2019" to test the glass transition temperature Tg: the dynamic thermomechanical analysis (DMA) method was used for testing. The test conditions were: three-point bending mode, frequency 1Hz, heating rate 3℃ / min, and temperature range 25~250℃.

[0118] (3) Viscosity at 340℃ (Pa·s): According to ISO 11443:2021 standard, a capillary rheometer (model: Malvern Rosand RH7) was used. The test temperature was 340℃, the shear rate was 1000 s⁻¹, and the stable viscosity value was obtained after holding for 5 min.

[0119] (4) Melt flow rate (MFR, 340℃, 5kg) was continuously tested for 6 hours. After 6 hours, the MFR decrease rate (%) was calculated as ([MFR(0)-] / MFR(t))×100%;

[0120] The test results are shown in Table 4:

[0121] Table 4

[0122]

[0123] 3. Performance

[0124] (1) Impact strength at -60℃ (kJ / m²): At -60℃, the test was conducted using a simply supported beam impact testing machine in accordance with the standard GB / T 229-2020, and the notch type of the specimen was type A;

[0125] (2) Mechanical strength:

[0126] (a) Tensile strength (MPa): Tested according to the method in standard GB / T 1040.2-2022, with a test temperature of 25±2℃ and a tensile rate of 50mm / min;

[0127] In this application, the resistance to damp heat aging was also tested. Specifically, the tensile strength of the PPSU / PPS composite alloy material was further tested after being placed in an environment of 85℃ / 85% RH for 1000 hours, according to the conditions for testing tensile strength mentioned above, and the retention rate of tensile strength (%) was calculated.

[0128] (b) Bending strength (MPa): Tested according to the method in standard GB / T 9341-2008, with a test temperature of 25±2℃, a span-to-thickness ratio of 16:1, and a bending rate of 2mm / min;

[0129] (3) Water absorption rate (%): According to ISO 62:2008, the sample was immersed in distilled water at 23℃ for 24h and the percentage of weight gain due to water absorption was determined;

[0130] The test results are shown in Table 5:

[0131] Table 5

[0132]

[0133] The above results indicate that:

[0134] The PPSU / PPS composite alloy material of this invention has a viscosity ≤1800 Pa•s at 340℃, exhibiting excellent processing fluidity. Furthermore, after continuous 6-hour melt flow rate (MFR) testing at 340℃ and 5 kg, the MFR decrease rate of the PPSU / PPS composite alloy material remained within 5%, indicating good processing stability. The tensile strength is 145 MPa or higher, and the flexural strength is 218 MPa or higher, demonstrating good mechanical properties. The water absorption rate is ≤0.25%.

[0135] 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 PPSU / PPS composite alloy material, characterized in that, The components include the following parts by weight: 50-70 parts polyphenylene sulfone, 15-35 parts polyphenylene sulfide, 1-3 parts interface modifier, 10-30 parts chopped glass fiber, 0.2-0.5 parts antioxidant; The interface modifier is a carbon-modified nano-metal oxide; the carbon-modified nano-metal oxide includes at least one of nano-silicon carbide and nano-graphene oxide; and the orientation degree of the chopped glass fibers in the PPSU / PPS composite alloy material is ≥80%. The carbon-modified nano-metal oxide is obtained through chemical covalent grafting modification, and the preparation method includes the following steps: S1: Raw material pretreatment: The nano-metal oxide was dispersed in anhydrous ethanol, a silane coupling agent was added, and the mixture was refluxed at 70°C for 2 hours. After centrifugation and washing, the aminated nano-metal oxide was obtained. Carbon material was added to an acetone solution containing maleic anhydride, stirred at 80°C for 4 hours, and then centrifuged and dried to obtain carboxylated carbon material. S2: Grafting reaction Aminated nano-metal oxides and carboxylated carbon materials are dispersed in DMF solvent; a catalyst is added, and the reaction is carried out at 110°C for 6 hours under nitrogen protection; the mixture is centrifuged and washed until neutral, and then vacuum dried for 48 hours to obtain the carbon material-modified nano-metal oxides.

2. The PPSU / PPS composite alloy material according to claim 1, characterized in that, The polyphenylene sulfone has a melt flow rate of 10~40 g / 10 min at 365℃ and 5 kg.

3. The PPSU / PPS composite alloy material according to claim 1, characterized in that, The melt flow rate of the polyphenylene sulfide at 365°C and 5 kg is 100~500 g / 10 min.

4. The PPSU / PPS composite alloy material according to claim 1, characterized in that, In the carbon-modified nano-metal oxide, the mass ratio of carbon material to nano-metal oxide is (1~2):

1.

5. The PPSU / PPS composite alloy material according to claim 1, characterized in that, The carbon-modified nano-metal oxide includes at least one of nano-titanium dioxide, nano-silicon dioxide, and nano-zirconium dioxide.

6. The PPSU / PPS composite alloy material according to claim 1, characterized in that, The particle size D of the carbon-modified nano-metal oxide V 50 represents 20~70nm.

7. The PPSU / PPS composite alloy material according to claim 1, characterized in that, The chopped glass fibers have a length of 3-5 mm and a diameter of 10-13 μm.

8. The PPSU / PPS composite alloy material according to claim 1, characterized in that, The antioxidants include phosphite antioxidants and hindered phenolic antioxidants, with a mass ratio of phosphite antioxidants to hindered phenolic antioxidants of (0.1~0.3):(0.1~0.2).

9. The method for preparing the PPSU / PPS composite alloy material according to any one of claims 1 to 8, characterized in that, Includes the following steps: (1) After mixing polyphenylene sulfone, polyphenylene sulfide, carbon material modified nano metal oxide, and antioxidant, a mixture is obtained; (2) Add the mixture obtained in step (1) into the main feed port of the extruder. At the same time, add short glass fibers in batches from the side feed port of the extruder. Perform gradient extrusion and granulation at a screw speed of 200~400 rpm and a temperature range of 300~340℃. (3) After drying the extruded material prepared in step (2), it is injection molded at 120~140℃ to obtain the PPSU / PPS composite alloy material.

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