High-toughness modified PPS engineering plastic and preparation method thereof

Abstract

The invention discloses a high-toughness modified PPS engineering plastic and a preparation method thereof, and relates to the technical field of engineering plastics. The high-toughness modified PPS engineering plastic is prepared from the following raw materials in parts by weight: 40 to 60 parts of polyphenylene sulfide, 10 to 20 parts of maleic anhydride grafted ethylene-octylene copolymer, 5 to 15 parts of nano calcium carbonate, 10 to 20 parts of modified glass fiber, 0.5 to 2 parts of titanate coupling agent, 0.2 to 1 part of antioxidant 1010, 0.2 to 1 part of antioxidant 168, 0.5 to 2 parts of stearic acid, 0.5 to 2 parts of bisoxazoline and 10 to 20 parts of modified polyphenylene sulfide reinforcement. Through a ternary synergistic modification system and a gradient blending process, the bottleneck that toughness and rigidity of traditional PPS are difficult to consider at the same time is broken through, the preparation process is simple and controllable, the raw material cost is reduced compared with similar high-performance engineering plastics, and the high-performance engineering plastic is suitable for industrial large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering plastics, in particular to a high-toughness modified PPS engineering plastic and a preparation method thereof. Background Art

[0002] Polyphenylene sulfide (PPS) is a high-performance thermoplastic engineering plastic with outstanding heat resistance, chemical stability, flame retardancy, and dimensional stability. Its long-term operating temperature can reach over 220°C, maintaining structural stability in high-temperature environments. It exhibits strong resistance to strong acids, strong bases, and various organic solvents, making it highly resistant to chemical corrosion. It has a UL94V-0 flame retardancy rating and excellent self-extinguishing properties. Furthermore, the material offers excellent dimensional stability, with minimal changes in the shape and size of finished products under varying temperature and environmental conditions. These exceptional properties have led to its widespread application in numerous fields, including electronics, automotive manufacturing, and aerospace.

[0003] However, PPS has significant drawbacks. Its molecular chains are highly rigid and highly cross-linked, resulting in a material with severely insufficient toughness, with notched impact strength typically below 10 kJ / m². It is highly susceptible to brittle fracture when subjected to impact or alternating loads, significantly limiting its application in structural parts and high-stress bearing components that must withstand significant stress.

[0004] At present, there are many shortcomings in the modification technology for PPS. Although the single addition of rubber elastomers as toughening agents can improve the toughness of the material to a certain extent, it will lead to a significant decrease in heat resistance, a decrease in glass transition temperature, and large fluctuations in melt viscosity, which increases the difficulty of processing. Although filling with inorganic fillers such as calcium carbonate and glass fiber can enhance the rigidity of the material, due to poor interfacial compatibility, it is easy to form stress concentration inside the material, which further reduces the toughness. Traditional surface modification processes, whether acid etching or coupling agent treatment, have limited effects on improving the interfacial bonding between the PPS matrix and additives, and cannot achieve synergistic optimization of the mechanical properties of the material. Therefore, there is an urgent need to develop a new modification technology that can effectively improve the interfacial compatibility of PPS, significantly improve toughness, and take into account other material properties. This has important engineering value and broad market prospects for expanding the application field of PPS and meeting high-end manufacturing needs. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a high-toughness modified PPS engineering plastic and a preparation method thereof, which solves the problems of insufficient toughness and poor compatibility.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A high-toughness modified PPS engineering plastic comprises the following raw materials in parts by weight: 40-60 parts of polyphenylene sulfide, 10-20 parts of maleic anhydride grafted ethylene-octene copolymer, 5-15 parts of nano-calcium carbonate, 10-20 parts of modified glass fiber, 0.5-2 parts of titanate coupling agent, 0.2-1 parts of antioxidant 1010, 0.2-1 parts of antioxidant 168, 0.5-2 parts of stearic acid, 0.5-2 parts of bisoxazoline, and 10-20 parts of modified polyphenylene sulfide reinforcement.

[0008] Furthermore, the maleic anhydride grafted ethylene-octene copolymer is prepared by melt grafting, with a maleic anhydride grafting rate of 0.8-2.5% and a weight average molecular weight of 50,000-120,000.

[0009] Furthermore, the modified polyphenylene sulfide reinforcement is specifically prepared in the following steps:

[0010] A1. Add polyphenylene sulfide particles to a four-necked flask, pour in 8% sodium hydroxide solution to completely immerse the polyphenylene sulfide particles, stir at 300 r / min, and heat to 70°C for 4 hours. After the reaction, filter and separate the particles, collect the particles, wash them, and filter again until the pH value of the washing solution reaches 7. Dry the washed particles at 90°C and -0.1 MPa to constant weight to obtain surface hydroxylated polyphenylene sulfide.

[0011] A2. Add the surface hydroxylated modified polyphenylene sulfide, acrylic acid and xylene solvent to a four-necked flask in sequence, stir and dissolve at 400 r / min, and after the system is uniform, introduce nitrogen for 15 minutes, then add azobisisobutyronitrile, raise the temperature to 100°C, continue stirring and react for 6 hours, after the reaction is completed, wait for it to cool to room temperature, slowly pour the reaction product into excess ethanol to precipitate, filter and collect the precipitated product, and wash it with ethanol 3 times, filter it after each washing, and finally dry the washed product at 100°C and -0.1 MPa to constant weight to obtain acrylic acid grafted modified polyphenylene sulfide;

[0012] A3. Add acrylic acid grafted modified polyphenylene sulfide and nano-silica into a beaker, pour in anhydrous ethanol to completely immerse the raw materials, and ultrasonically disperse for 30 minutes. Transfer the evenly dispersed solution to an evaporating dish, stir at 250 r / min and raise the temperature to 60°C. Slowly evaporate the ethanol under stirring conditions and stir until a dry powder product, i.e., the modified polyphenylene sulfide reinforcement, is obtained.

[0013] Furthermore, the mass ratio of the surface hydroxylated modified polyphenylene sulfide, acrylic acid, xylene, and azobisisobutyronitrile in A2 is 8:5:15:0.1; and the mass ratio of the acrylic acid grafted modified polyphenylene sulfide and nano-silica in A3 is 1:0.1.

[0014] Sodium hydroxide solution etches the PPS surface, introducing hydroxyl functional groups, increasing surface roughness, expanding specific surface area, and providing active sites for subsequent grafting reactions. Acrylic acid is grafted onto the hydroxylated PPS surface through free radical polymerization, forming a "flexible molecular chain bridge," reducing the interfacial tension between PPS and POE and promoting compatibility between the two phases. Nano-silica is embedded in the acrylic graft layer through physical adsorption, forming a "rigid core-flexible shell" structure, which induces multiple silver streaks and plastic deformation under the action of external forces, consuming impact energy. The strong shear field within the twin-screw extruder causes the modified reinforcement to be evenly dispersed, forming a gradient interface structure of "PPS matrix-grafted layer-nanofiller," achieving layer-by-layer stress transmission and dissipation, and avoiding overall failure caused by single-phase destruction.

[0015] Furthermore, the modified glass fiber is specifically prepared in the following steps:

[0016] B1. Immerse the glass fiber in a 5% collagen solution and ultrasonically treat it at 40°C for 15 minutes. Remove it, drain it, and alternately soak it in a 15% calcium chloride solution and a 10% disodium hydrogen phosphate solution for 5 minutes each time. Repeat this cycle three times. Finally, dry it at 60°C for 2 hours.

[0017] B2. Add the glass fiber treated with B1 into xylene solvent, add methyl methacrylate and styrene, heat to 80°C under nitrogen protection, stir for 30 minutes, then add benzoyl peroxide, heat to 100°C and react for 4 hours. After the reaction, wash with ethanol three times and vacuum dry at 80°C for 3 hours.

[0018] B3. Add silane coupling agent KH-560 to a mixed solution of ethanol and water with a volume ratio of 2:3, adjust the pH to 4, hydrolyze for 30 minutes to form a silanol solution, add nano-silicon carbide particles, ultrasonically disperse for 20 minutes to form a uniform sol, immerse the glass fiber treated with B2 in the sol, stir at 60°C for 1 hour, and finally cure at 120°C for 2 hours to obtain modified glass fiber.

[0019] Furthermore, the mass ratio of the glass fiber, collagen solution, calcium chloride solution, and disodium hydrogen phosphate solution in B1 is 1:1:3:2; the glass fiber length is 3-5nm; the mass ratio of the glass fiber treated with B1, xylene, methyl methacrylate, styrene, and benzoyl peroxide in B2 is 5:10:4:2:0.1; and in B3, the mass ratio of the silane coupling agent KH-560, the ethanol-water mixed solution, nano-silicon carbide, and the glass fiber treated with B2 is 0.5:25:2:10, and the nano-silicon carbide particle size is 50nm.

[0020] Furthermore, the preparation steps of the modified glass fiber follow a three-step continuous modification treatment sequence of B1 collagen-mineralized coating treatment, B2 gradient polymer grafting, and finally B3 nano-silicon carbide texturing.

[0021] In B1, the glass fiber is treated with a collagen solution. The collagen molecules form an organic coating on the glass fiber surface, improving its compatibility with the polymer matrix. Subsequently, the glass fiber is alternately immersed in a calcium chloride solution and a disodium hydrogen phosphate solution, forming a calcium phosphate coating similar to bone mineralization. This mineralized coating increases the surface roughness of the glass fiber while also containing polar groups that interact more strongly with the polymer matrix, further enhancing interfacial bonding. In B2, methyl methacrylate and styrene are grafted and polymerized onto the glass fiber surface, forming a gradient polymer layer. This gradient polymer layer exhibits a certain degree of flexibility and acts as a buffer between the glass fiber and the PPS matrix, reducing stress concentration. In B3, the glass fiber is immersed in a sol, where a silane coupling agent chemically bonds to the glass fiber surface. Simultaneously, nano-silicon carbide particles are evenly distributed on the glass fiber surface, forming a textured structure. Nano-silicon carbide possesses high hardness and strength, enhancing the mechanical properties of the glass fiber. Furthermore, its nanoscale size effect further improves interfacial bonding with the PPS matrix, enhancing the overall performance of the material.

[0022] A method for preparing high-toughness modified PPS engineering plastics specifically comprises the following steps:

[0023] S1. Pour nano calcium carbonate into a high-speed stirrer, add titanate coupling agent, heat to 90 ° C, stir at 200 r / min for 20 min, after stirring, wait for the stirring container to cool to room temperature, take out the surface treated nano calcium carbonate for standby use; place the modified glass fiber in a blast drying oven, dry at 110 ° C for 3h, after drying, wait for the temperature in the oven to drop to room temperature, take out the modified glass fiber for standby use;

[0024] S2, set each section temperature of twin-screw extruder, treat that each section temperature all reaches setting temperature and stabilizes after 10min, 200r / min stirs, add polyphenylene sulfide, 1min after, add maleic anhydride grafted ethylene-octene copolymer, 1min after, add antioxidant 1010 and antioxidant 168 successively, be adjusted to 300r / min and stir, 2min after, add stearic acid, bisoxazoline, 2min after, add pretreated nano calcium carbonate, 3min after, add modified glass fiber and modified polyphenylene sulfide reinforcement, stir 5min;

[0025] S3. The blend is pelletized by water cooling in a pelletizer, the water temperature is maintained at 15-20° C., and the pellet length is 2-4 mm, to obtain high-toughness modified PPS engineering plastic pellets.

[0026] Furthermore, in step S2, the temperature of each section of the twin-screw extruder is: 180-200°C in the first section, 220-240°C in the second section, 260-280°C in the third section, 280-300°C in the fourth section, and 280-300°C in the fifth section.

[0027] The present invention provides a high-toughness modified PPS engineering plastic and a preparation method thereof, which has the following beneficial effects:

[0028] 1. Through the mutual cooperation of maleic anhydride grafted POE and thrice-modified PPS reinforcement, the elastomeric network formed by maleic anhydride grafted POE is dispersed in the PPS matrix. When impacted, it first elastically deforms to absorb energy. The thrice-modified PPS reinforcement exerts a "micro-spring" toughening effect, and its internal flexible grafted chain segments and nano-silica synergistically deform to further dissipate energy, achieving a breakthrough improvement in the toughness of PPS engineering plastics.

[0029] 2. To address the interface issues between the filler and the matrix, a dual optimization strategy was adopted. After being treated with a titanate coupling agent, the nano-calcium carbonate forms a dense coupling agent coating on its surface. The ester functional groups in the acrylic acid-grafted PPS chemically bond with the coupling agent groups on the surface of the nano-calcium carbonate, reducing filler agglomeration and avoiding stress concentration. This allows the nano-calcium carbonate to be evenly dispersed in the PPS matrix and fully exert its reinforcing effect.

[0030] 3. In the formulation system of the present invention, modified glass fiber and nano-silica work together to form a "rigid skeleton" structure. The modified glass fiber supports the material structure within the PPS matrix, improving its load-bearing capacity. The nano-silica acts as a modified reinforcement, filling the gaps between the PPS molecular chains and the modified glass fiber, enhancing intermolecular interactions and imparting excellent strength and rigidity to the material.

[0031] 4. To address the issues of PPS degradation and uneven component dispersion during processing, a twin-screw extruder temperature control process and gradient feeding sequence were designed. Precise temperature control in the 280-300°C melt zone prevents PPS from high-temperature degradation. Gradient feeding ensures that each component enters the extruder at a rhythmic pace, allowing for even dispersion under the shearing and stirring of the screw. This improves production efficiency, ensures consistent product quality, and provides support for industrial large-scale production. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] Example 1: Preparation of high-toughness modified PPS engineering plastics. The specific preparation steps are as follows:

[0034] S1. Pour 5 parts of nano-calcium carbonate into a high-speed stirrer, add 0.5 parts of titanate coupling agent, heat to 90 ° C, stir at 200 r / min for 20 min, after stirring, wait for the stirred container to cool to room temperature, take out the surface-treated nano-calcium carbonate for standby use; place the modified glass fiber in a blast drying oven and dry it at 110 ° C for 3 h. After drying, wait until the temperature in the oven drops to room temperature, take out the modified glass fiber for standby use;

[0035] S2, set the temperature of each section of the twin-screw extruder: 180 ℃ for the first section, 220 ℃ for the second section, 260 ℃ for the third section, 280 ℃ for the fourth section, and 280 ℃ for the fifth section. After the temperature of each section reaches the set temperature and stabilizes for 10 min, start stirring and add 40 parts of polyphenylene sulfide. After 1 min, add 10 parts of maleic anhydride grafted ethylene-octene copolymer. After 1 min, add 0.2 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 in sequence. Promote the stirring speed to 300 r / min. After 2 min, add 0.5 parts of stearic acid and 0.5 parts of bisoxazoline. After 2 min, add 5 parts of pretreated nano-calcium carbonate. After 3 min, add 10 parts of modified glass fibers and 10 parts of modified polyphenylene sulfide reinforcements and stir for 5 min.

[0036] S3. The blend is pelletized by water cooling in a pelletizer, the water temperature is maintained at 15° C., and the pellet length is 2 mm, to obtain high-toughness modified PPS engineering plastic pellets.

[0037] Example 2: Preparation of high-toughness modified PPS engineering plastics. The specific preparation steps are as follows:

[0038] S1. Pour 15 parts of nano-calcium carbonate into a high-speed stirrer, add 2 parts of titanate coupling agent, heat to 90 ° C, stir at 200r / min for 20min, after stirring, wait for the stirred container to cool to room temperature, take out the surface-treated nano-calcium carbonate for standby use; place the modified glass fiber in a blast drying oven and dry it at 110 ° C for 3h. After drying, wait until the temperature in the box drops to room temperature, take out the modified glass fiber for standby use;

[0039] S2, set the temperature of each section of the twin-screw extruder: 200 ℃ for the first section, 240 ℃ for the second section, 280 ℃ for the third section, 300 ℃ for the fourth section, and 300 ℃ for the fifth section. After the temperature of each section reaches the set temperature and stabilizes for 10 min, start stirring and add 60 parts of polyphenylene sulfide. After 1 min, add 20 parts of maleic anhydride grafted ethylene-octene copolymer. After 1 min, add 1 part of antioxidant 1010 and 1 part of antioxidant 168 in sequence. Promote the stirring speed to 300 r / min. After 2 min, add 2 parts of stearic acid and 2 parts of bisoxazoline. After 2 min, add 15 parts of pretreated nano-calcium carbonate. After 3 min, add 20 parts of modified glass fiber and 20 parts of modified polyphenylene sulfide reinforcement and stir for 5 min.

[0040] S3. The blend is water-cooled and pelletized in a pelletizer, the water temperature is maintained at 20° C., and the pellet length is 4 mm, to obtain high-toughness modified PPS engineering plastic pellets.

[0041] Example 3, preparation of high-toughness modified PPS engineering plastics, the specific preparation steps are as follows:

[0042] S1. Pour 10 parts of nano-calcium carbonate into a high-speed stirrer, add 1 part of titanate coupling agent, heat to 90°C, stir at 200r / min for 20min, after stirring, wait for the stirred container to cool to room temperature, take out the surface-treated nano-calcium carbonate for standby use; place the modified glass fiber in a blast drying oven and dry it at 110°C for 3h. After drying, wait for the temperature in the oven to drop to room temperature, take out the modified glass fiber for standby use;

[0043] S2, set the temperature of each section of the twin-screw extruder: 190 ℃ for the first section, 230 ℃ for the second section, 270 ℃ for the third section, 290 ℃ for the fourth section, and 290 ℃ for the fifth section. After the temperature of each section reaches the set temperature and stabilizes for 10 min, start stirring and add 50 parts of polyphenylene sulfide. After 1 min, add 15 parts of maleic anhydride grafted ethylene-octene copolymer. After 1 min, add 0.5 parts of antioxidant 1010 and 0.5 parts of antioxidant 168 in sequence. Promote the stirring speed to 300 r / min. After 2 min, add 1 part of stearic acid and 1 part of bisoxazoline. After 2 min, add 10 parts of pretreated nano-calcium carbonate. After 3 min, add 15 parts of modified glass fibers and 15 parts of modified polyphenylene sulfide reinforcements and stir for 5 min.

[0044] S3. The blend is water-cooled and pelletized in a pelletizer, the water temperature is maintained at 17° C., and the pellet length is 3 mm, to obtain high-toughness modified PPS engineering plastic pellets.

[0045] Example 4: Preparation of modified polyphenylene sulfide reinforcement. The specific preparation steps are as follows:

[0046] A1. Add polyphenylene sulfide particles to a four-necked flask, pour in an 8% by mass sodium hydroxide solution to completely immerse the polyphenylene sulfide particles, stir at 300 r / min, and heat to 70°C for 4 hours. After the reaction, filter and separate the particles, collect the particles, wash them, and filter again until the pH value of the washing solution reaches 7. Dry the washed particles at 90°C and -0.1 MPa to constant weight to obtain surface-hydroxylated polyphenylene sulfide.

[0047] A2, 80g of surface hydroxylated polyphenylene sulfide, 50g of acrylic acid and 150g of xylene solvent were sequentially added to a four-necked flask, stirred and dissolved at 400r / min, and after the system was uniform, nitrogen was introduced at a flow rate of 50mL / min for 15min, followed by addition of 1g of azobisisobutyronitrile, and stirring was continued. The temperature was raised to 100°C and the reaction was allowed to proceed for 6h. After the reaction was completed, the reaction product was cooled to room temperature and slowly poured into excess ethanol to precipitate. The precipitated product was collected by filtration and washed with ethanol 3 times, filtered after each washing, and the washed product was dried to constant weight at 100°C and -0.1MPa to obtain acrylic acid-grafted polyphenylene sulfide;

[0048] A3. Add 80 g of acrylic acid-grafted modified polyphenylene sulfide and 8 g of nano-silica into a beaker, pour in anhydrous ethanol to completely immerse the raw materials, and ultrasonically disperse for 30 minutes. Transfer the evenly dispersed solution to an evaporating dish, stir at 250 r / min and raise the temperature to 60°C. Slowly evaporate the ethanol while stirring, and stir until a dry powdery product is obtained, i.e., the modified polyphenylene sulfide reinforcement.

[0049] Example 5: Preparation of modified glass fiber. The specific preparation steps are as follows:

[0050] B1. Immerse 100 g of glass fiber in 100 g of 5% collagen solution, ultrasonically treat at 40°C for 15 min, remove and drain, then alternately immerse in 30 g of 15% calcium chloride solution and 20 g of 10% disodium hydrogen phosphate solution, 5 min each time, for three cycles, and finally dry at 60°C for 2 h.

[0051] B2, add 100g of glass fiber treated with B1 to 200g of xylene solvent, add 80g of methyl methacrylate and 40g of styrene, heat to 80°C under nitrogen protection, stir for 30min, then add 2g of benzoyl peroxide, heat to 100°C and react for 4h. After the reaction, wash with ethanol three times and vacuum dry at 80°C for 3h;

[0052] B3. Add 5 g of silane coupling agent KH-560 to 250 g of a mixed solution of ethanol and water with a volume ratio of 2:3, adjust the pH to 4, hydrolyze for 30 min to form a silanol solution, add 20 g of nano-silicon carbide particles, ultrasonically disperse for 20 min to form a uniform sol, immerse 100 g of B2-treated glass fiber in the sol, stir at 60 ° C for 1 h, and finally cure at 120 ° C for 2 h to obtain modified glass fiber.

[0053] Comparative Example 1: Preparation of high-toughness modified PPS engineering plastics. The specific preparation steps are as follows:

[0054] The remaining steps remained unchanged, except that the modified polyphenylene sulfide reinforcement in Example 3 was replaced by polyphenylene sulfide without any treatment to prepare a high-toughness modified PPS engineering plastic.

[0055] Comparative Example 2: Preparation of high-toughness modified PPS engineering plastics. The specific preparation steps are as follows:

[0056] The remaining steps remained unchanged, except that the modified glass fiber in Example 3 was replaced by glass fiber without any treatment to prepare a high-toughness modified PPS engineering plastic.

[0057] Performance Testing

[0058] Test items Test standards Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Charpy notched impact (23°C) ISO 179 <![CDATA[20 kJ / m 2 ]]> <![CDATA[21 kJ / m 2 ]]> <![CDATA[22 kJ / m 2 ]]> <![CDATA[15 kJ / m 2 ]]> <![CDATA[16 kJ / m 2 ]]> Tensile strength (5mm / min) ISO 527 115 MPa 118 MPa 120 MPa 95 MPa 100 MPa Flexural modulus (2mm / min) ISO 178 3.0 GPa 3.1 GPa 3.3 GPa 2.6 GPa 2.7 GPa Heat deformation temperature (1.80MPa, 120℃ / h) ISO 75 223 ℃ 225 ℃ 227 ℃ 200 ℃ 205 ℃ Shrinkage (23℃) ISO 294-4 0.32% 0.3% 0.28% 0.37% 0.35% Flame retardant grade UL94 V-0 V-0 V-0 V-0 V-0

[0059] Judging from the performance test results, the high-toughness modified PPS engineering plastics of Examples 1-3 are superior to those of Comparative Examples 1 and 2 in mechanical properties such as simply supported beam notched impact strength, tensile strength, and flexural modulus. The heat deformation temperature is improved, the shrinkage rate is reduced, and the flame retardancy level reaches UL94V-0. This shows that the modified polyphenylene sulfide reinforcement and modified glass fiber have a significant effect on improving the material performance. This modification method can effectively improve the toughness, strength and other properties of PPS engineering plastics while maintaining good heat resistance and flame retardancy.

[0060] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A high-toughness modified PPS engineering plastic, characterized by: The invention comprises the following raw materials in parts by weight: 40-60 parts of polyphenylene sulfide, 10-20 parts of maleic anhydride grafted ethylene-octene copolymer, 5-15 parts of nano-calcium carbonate, 10-20 parts of modified glass fiber, 0.5-2 parts of titanate coupling agent, 0.2-1 parts of antioxidant 1010, 0.2-1 parts of antioxidant 168, 0.5-2 parts of stearic acid, 0.5-2 parts of bisoxazoline, and 10-20 parts of modified polyphenylene sulfide reinforcement.

2. A high-toughness modified PPS engineering plastic according to claim 1, characterized in that: The maleic anhydride grafted ethylene-octene copolymer is prepared by a melt grafting method, with a maleic anhydride grafting rate of 0.8-2.5% and a weight-average molecular weight of 50,000-120,000.

3. A high-toughness modified PPS engineering plastic according to claim 1, characterized in that: The modified polyphenylene sulfide reinforcement is specifically prepared in the following steps: A1. Add polyphenylene sulfide particles to a four-necked flask, pour in 8% sodium hydroxide solution to completely immerse the polyphenylene sulfide particles, stir at 300 r / min, and heat to 70°C for 4 hours. After the reaction, filter and separate the particles, collect the particles, wash them, and filter again until the pH value of the washing solution reaches 7. Dry the washed particles at 90°C and -0.1 MPa to constant weight to obtain surface hydroxylated polyphenylene sulfide. A2. Add the surface hydroxylated modified polyphenylene sulfide, acrylic acid and xylene solvent to a four-necked flask in sequence, stir and dissolve at 400 r / min, and after the system is uniform, introduce nitrogen for 15 minutes, then add azobisisobutyronitrile, raise the temperature to 100°C, continue stirring and react for 6 hours, after the reaction is completed, wait for it to cool to room temperature, slowly pour the reaction product into excess ethanol to precipitate, filter and collect the precipitated product, and wash it with ethanol 3 times, filter it after each washing, and finally dry the washed product at 100°C and -0.1 MPa to constant weight to obtain acrylic acid grafted modified polyphenylene sulfide; A3. Add acrylic acid grafted modified polyphenylene sulfide and nano-silica into a beaker, pour in anhydrous ethanol to completely immerse the raw materials, and ultrasonically disperse for 30 minutes. Transfer the evenly dispersed solution to an evaporating dish, stir at 250 r / min and raise the temperature to 60°C. Slowly evaporate the ethanol under stirring conditions and stir until a dry powder product, i.e., the modified polyphenylene sulfide reinforcement, is obtained.

4. A high-toughness modified PPS engineering plastic according to claim 3, characterized in that: The mass ratio of surface hydroxylated modified polyphenylene sulfide, acrylic acid, xylene, and azobisisobutyronitrile in A2 is 8:5:15:0.1; the mass ratio of acrylic acid grafted modified polyphenylene sulfide and nano-silica in A3 is 1:0.

1.

5. The high-toughness modified PPS engineering plastic according to claim 1, characterized in that: The modified glass fiber is specifically prepared in the following steps: B1. Immerse the glass fiber in a 5% collagen solution and ultrasonically treat it at 40°C for 15 minutes. Remove it, drain it, and alternately soak it in a 15% calcium chloride solution and a 10% disodium hydrogen phosphate solution for 5 minutes each time. Repeat this cycle three times. Finally, dry it at 60°C for 2 hours. B2. Add the glass fiber treated with B1 into xylene solvent, add methyl methacrylate and styrene, heat to 80°C under nitrogen protection, stir for 30 minutes, then add benzoyl peroxide, heat to 100°C and react for 4 hours. After the reaction, wash with ethanol three times and vacuum dry at 80°C for 3 hours. B3. Add silane coupling agent KH-560 to a mixed solution of ethanol and water with a volume ratio of 2:3, adjust the pH to 4, hydrolyze for 30 minutes to form a silanol solution, add nano-silicon carbide particles, ultrasonically disperse for 20 minutes to form a uniform sol, immerse the glass fiber treated with B2 in the sol, stir at 60°C for 1 hour, and finally cure at 120°C for 2 hours to obtain modified glass fiber.

6. The high-toughness modified PPS engineering plastic according to claim 5, characterized in that: The mass ratio of the glass fiber, collagen solution, calcium chloride solution, and disodium hydrogen phosphate solution in B1 is 1:1:3:2; the length of the glass fiber is 3-5 nm; the mass ratio of the glass fiber treated with B1, xylene, methyl methacrylate, styrene, and benzoyl peroxide in B2 is 5:10:4:2:0.1; in B3, the mass ratio of the silane coupling agent KH-560, the ethanol-water mixed solution, nano-silicon carbide, and the glass fiber treated with B2 is 0.5:25:2:10, and the particle size of the nano-silicon carbide is 50 nm.

7. The high-toughness modified PPS engineering plastic according to claim 5, characterized in that: The preparation steps of the modified glass fiber follow a three-step continuous modification treatment sequence of B1 collagen-mineralized coating treatment, B2 gradient polymer grafting, and finally B3 nano-silicon carbide texturing.

8. A method for preparing high-toughness modified PPS engineering plastics, characterized by: The specific steps include: S1. Pour nano calcium carbonate into a high-speed stirrer, add titanate coupling agent, heat to 90 ° C, stir at 200 r / min for 20 min, after stirring, wait for the stirring container to cool to room temperature, take out the surface treated nano calcium carbonate for standby use; place the modified glass fiber in a blast drying oven, dry at 110 ° C for 3h, after drying, wait for the temperature in the oven to drop to room temperature, take out the modified glass fiber for standby use; S2, set each section temperature of twin-screw extruder, treat that each section temperature all reaches setting temperature and stabilizes after 10min, 200r / min stirs, add polyphenylene sulfide, 1min after, add maleic anhydride grafted ethylene-octene copolymer, 1min after, add antioxidant 1010 and antioxidant 168 successively, be adjusted to 300r / min and stir, 2min after, add stearic acid, bisoxazoline, 2min after, add pretreated nano calcium carbonate, 3min after, add modified glass fiber and modified polyphenylene sulfide reinforcement, stir 5min; S3. The blend is pelletized by water cooling in a pelletizer, the water temperature is maintained at 15-20° C., and the pellet length is 2-4 mm, to obtain high-toughness modified PPS engineering plastic pellets.

9. The method for preparing a high-toughness modified PPS engineering plastic according to claim 8, characterized in that: In the step S2, the temperature of each section of the twin-screw extruder is: 180-200°C in the first section, 220-240°C in the second section, 260-280°C in the third section, 280-300°C in the fourth section, and 280-300°C in the fifth section.