A laser weldable hydrolysis resistant bio-based high temperature nylon composition and method of making the same

Abstract

The present application relates to the technical field of nylon composite materials, and particularly relates to a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition and a preparation method and application thereof.The laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition is prepared from the following raw materials by weight: 50-65 parts of a high-temperature-resistant nylon base, 30-36 parts of modified short-cut glass fiber, 3-10 parts of LCP resin, 0.3-1.0 parts of hyperbranched nylon, 0.5-2 parts of a hydrolysis-resistant agent, 0.5-3 parts of a laser-transmission adjusting additive, 0.5-1.0 parts of a heat stabilizer, and 0.1-1.0 parts of a lubricant.The present application has the advantages of super-strong hydrolysis resistance, high-temperature resistance, low water absorption, high dimensional stability, and good laser-welding performance, and is applied to the production of an automotive electronic water pump shell to realize laser welding of the shell parts, so that the shell parts have excellent laser-welding strength and ensure the sealing performance of the water pump shell.

Description

Technical Field

[0001] This invention relates to the field of nylon composite materials technology, and in particular to a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition, its preparation method, and its application. This composition is used in the manufacture of automotive electronic water pump housings, and is especially suitable for thermal management systems of new energy vehicles. Background Technology

[0002] The automotive electronic water pump is a core component of the cooling circulation system. Its housing is in constant contact with high-temperature (110-130℃) aqueous glycol coolant. Traditional manufacturing materials include polyphenylene sulfide (PPS), glass fiber reinforced nylon 66, and glass fiber reinforced PA6T / 66. However, traditional materials have significant drawbacks. While PPS is heat- and hydrolysis-resistant, it is brittle and has extremely low transmittance to near-infrared lasers, making laser welding virtually impossible. Only vibration friction welding or ultrasonic welding can be used, which suffers from low efficiency, high dust levels, and poor sealing reliability.

[0003] Although glass fiber reinforced nylon 66 can be laser welded, it has an extremely high water absorption rate. After long-term contact with coolant, it expands significantly due to water absorption and hot water hydrolysis, resulting in a sharp drop in strength, leading to dimensional instability and even shell cracking.

[0004] While glass fiber reinforced PA6T / 66 exhibits superior heat resistance compared to glass fiber reinforced nylon 66, it also suffers from higher water absorption and insufficient dimensional stability. Furthermore, it faces the challenge of balancing light transmittance and weld strength during laser welding. To address these issues, this invention provides a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition. Summary of the Invention

[0005] To address the technical problems existing in the manufacturing materials of current automotive electronic water pumps, this invention provides a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition and its preparation method.

[0006] The present invention provides a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition, which is achieved through the following technical solution:

[0007] A laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition comprises the following raw materials in parts by weight: 50-65 parts high-temperature resistant nylon matrix, 30-36 parts modified chopped glass fiber, 3-10 parts LCP resin, 0.5-2 parts anti-hydrolysis agent, 0.3-1.0 parts hyperbranched nylon, 0.5-3 parts laser transmission modifier, 0.5-1.0 parts heat stabilizer, and 0.1-1.0 parts lubricant.

[0008] This invention employs a high-temperature resistant nylon matrix to ensure the nylon composition exhibits superior hydrolysis resistance, high-temperature performance, low water absorption, mechanical properties, dimensional stability, and chemical corrosion resistance. The modified chopped glass fibers used in this invention have good compatibility with the high-temperature resistant nylon matrix, allowing for uniform dispersion within the matrix. This improves the tensile strength, flexural strength, impact strength, and modulus of the nylon composition while reducing water absorption and enhancing overall dimensional stability. LCP resin is used to reduce the viscosity of the extruded melt, improving processing performance. LCP also acts as a nucleating agent, promoting the crystallization of the high-temperature resistant nylon matrix and further enhancing the nylon composition's superior hydrolysis resistance, high-temperature performance, mechanical properties, dimensional stability, and chemical corrosion resistance. An anti-hydrolysis agent is used in this invention to further enhance the nylon composition's superior hydrolysis resistance. The use of hyperbranched nylon in this invention addresses the "floating fiber" problem, improving processing flow properties, and also enhances the impact toughness and dimensional stability of the nylon composition. Laser transmission modifiers improve laser absorption, thereby enhancing laser welding performance. Applied in the production of automotive electronic water pump housings, they enable laser welding of housing components, resulting in excellent laser weld strength and ensuring the water pump housing's sealing performance. Heat stabilizers improve the resistance to thermo-oxidative degradation during the extrusion processing of nylon compositions, giving them better aging resistance and ensuring the mechanical properties of the finished product. Lubricants improve mold release performance and also help mitigate the "fiber floating" problem.

[0009] Preferably, the LCP resin is at least one of Polyplastics A430, Ticona A950, Polyplastics A950, Celanese A950, Celanese S475, Polyplastics S475, Ticona S625, Celanese V200P, Celanese V400P, Sumitomo E6808THF-NC, and Nanjing Qingyan L10.

[0010] By adopting the above technical solution, LCP resin is used to reduce the viscosity of extruded melt and improve processing performance. At the same time, LCP can act as a nucleating agent to promote the crystallization of high-temperature resistant nylon matrix and improve the nylon composition's superior hydrolysis resistance, high-temperature resistance, mechanical properties, dimensional stability, and chemical corrosion resistance.

[0011] Preferably, the high-temperature resistant nylon matrix is ​​a semi-aromatic high-temperature nylon, which is PA10T or PA10T combined with at least one of PA5T, PA6T, PA9T, PA10T / 10I, PA11T, PA12T, PA13T, PA10N, PA11N, PA12N, PA13N, and PA13B.

[0012] By adopting the above technical solutions, the superior hydrolysis resistance, high temperature resistance, low water absorption, mechanical properties, dimensional stability, and chemical corrosion resistance of the nylon composition can be guaranteed.

[0013] Preferably, the hyperbranched nylon is at least one of HyPer C100, HyPer C181, HyPer C182, and HyPer C182D.

[0014] By adopting the above technical solution, the "floating fiber" problem can be solved on the one hand, improving processing flow properties, and the impact toughness and dimensional stability of the nylon composition can be improved on the other hand. The necessity of adding hyperbranched nylon lies in the fact that the modified chopped glass fiber contains 20-40% modified LGF. Under the same addition amount, the MFR of the extruded melt formed by the modified chopped glass fiber in this invention is lower than that of the traditional modified SGF, resulting in poorer flow properties. Therefore, it is necessary to add an appropriate amount of hyperbranched nylon to the formulation to synergistically improve the processing flow properties of the extruded melt in order to meet the requirements of automotive electronic water pump housing production.

[0015] Preferably, the modified chopped glass fiber includes modified SGF and modified LGF, wherein the length of the modified LGF is 5-7 mm, and the modified LGF accounts for 20-40% of the total mass of the modified chopped glass fiber.

[0016] By adopting the above technical solution, the modified SGF / LGF compound can reduce water absorption, improve overall dimensional stability, and also improve the mechanical properties of the nylon composition (especially impact toughness).

[0017] Preferably, the preparation method of the modified chopped glass fiber is as follows: First, LGF and SGF are weighed according to the ratio and dispersed in deionized water for ultrasonic cleaning. After filtration and rinsing, they are placed in a mercaptosilanol aqueous solution for ultrasonic dispersion treatment. After filtration, rinsing, and drying, mercaptosilane@SGF / LGF is obtained. Then, mercaptosilane@SGF / LGF is dispersed in deionized water, and 1-5 wt% of methacryloyloxysilane modified nano-alumina and 0.1-0.5 wt% of photoinitiator are added. Mercapto-alkene click chemistry is carried out under ultrasonic dispersion and ultraviolet light irradiation for 3-15 min. After filtration, rinsing, and drying, modified chopped glass fiber with nano-alumina coated on the surface is obtained.

[0018] By adopting the above technical solution, the modified short-cut glass fiber coated with nano-alumina improves the strength of the interfacial adhesion between it and the resin matrix, giving the nylon composition better mechanical properties, super hydrolysis resistance, high temperature resistance, low water absorption, and aging resistance. On the other hand, it can improve the laser absorption rate and quickly conduct and absorb the heat generated by the laser, reducing the amount of laser transmission modifier to be added. This effectively improves the laser welding performance of the nylon composition. When applied to the production of automotive electronic water pump housings, it can realize the laser welding of housing components, giving the housing components excellent laser welding strength and ensuring the sealing performance of the water pump housing.

[0019] Preferably, the anti-hydrolysis agent is a polymeric carbodiimide and / or a bisoxazoline compound; the heat stabilizer is a copper salt / potassium halide complex and / or an aromatic amine antioxidant.

[0020] By adopting the above technical solutions, the superior hydrolysis resistance of nylon compositions can be improved.

[0021] Preferably, the lubricant comprises at least one of the following: flake molybdenum disulfide, flake tungsten disulfide, boron nitride nanosheets, flake graphite, and graphene, combined with at least one of EBS, silicone powder, and lignite wax.

[0022] By adopting the above technical solution, the lubricant can improve the demolding performance, and at the same time help to improve the "fiber floating" problem. In addition, it can also act as a nucleating agent to improve the mechanical properties of the nylon composition.

[0023] Preferably, the laser transmission modulation agent is at least one of hyperbranched polyesteramine, aniline black, nano carbon black, nano titanium dioxide, nano titanium nitride, rare earth-doped nano yttrium oxide, nano zinc oxide, nano tungsten oxide, nano cobalt oxide, nano tungsten sulfide, and MAX phase ceramic powder.

[0024] By adopting the above technical solution, the laser absorption capacity is improved, thereby improving the laser welding performance. When applied to the production of automotive electronic water pump housings, laser welding of housing components can be achieved, exhibiting excellent laser welding strength. In addition, it can also act as a nucleating agent, improving the mechanical properties of nylon compositions.

[0025] The present invention provides a method for preparing a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition, which is achieved through the following technical solution:

[0026] A method for preparing a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition includes the following steps:

[0027] Step 1: Synthesis of modified chopped glass fibers;

[0028] At the same time, the high-temperature resistant nylon matrix and LCP resin were dried separately.

[0029] Step 2: According to the formula, add the dried high-temperature resistant nylon matrix, LCP resin, hyperbranched nylon, anti-hydrolysis agent, laser transmission modifier, heat stabilizer and lubricant to a high-speed mixer and mix evenly to obtain a mixture.

[0030] Step 3: The mixture obtained in Step 2 is added to the feed port of the twin-screw extruder. The modified chopped glass fibers synthesized in Step 1 are added from the side feed port of the twin-screw extruder. The mixture is then subjected to twin-screw shear melt extrusion with the following extrusion parameters: Zone 1: 150-170℃; Zone 2: 295-305℃; Zone 3: 310-315℃; Zone 4: 310-315℃; Zone 5: 320-330℃; Zone 6: 320- The temperature is set at 330℃, zone 7 is 325-335℃, zone 8 is 325-335℃, zone 9 is 325-335℃, the die head temperature is 325-335℃, the vacuum degree is 0.04-0.06MPa, the feeding frequency is 10-30Hz, and the process of drawing, water cooling, and pelletizing yields a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition. The resulting laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition can be injection molded to produce an automotive electronic water pump housing.

[0031] In summary, the present invention has the following advantages:

[0032] 1. The bio-based high-temperature nylon composition provided in this invention has the advantages of super hydrolysis resistance, high temperature resistance, low water absorption, and high dimensional stability, and also has good laser welding performance. When applied to the production of automotive electronic water pump housings, it can realize laser welding of housing components, so that the housing components have excellent laser welding strength and ensure the sealing performance of the water pump housing.

[0033] 2. In this invention, modified LGF is used to improve the impact toughness of the nylon composition, and hyperbranched nylon is compounded with LCP resin to synergistically improve the processing flow properties of the extruded melt, giving the nylon composition excellent super hydrolysis resistance, high temperature resistance, low water absorption, high dimensional stability, and good impact toughness.

[0034] 3. In this invention, by coating the surface of GF with a nano-alumina layer, the interfacial adhesion strength between the modified chopped glass fiber and the resin matrix is ​​improved, giving the nylon composition better mechanical properties, superior hydrolysis resistance, high temperature resistance, low water absorption, and aging resistance. At the same time, because nano-alumina has good absorption properties for lasers, it can improve the laser absorption rate of the nylon composition. In addition, the uniformly distributed modified chopped glass fiber can form a heat-conducting network, which can quickly conduct the heat generated by the alumina absorbing the laser, effectively improving the laser welding performance of the nylon composition. When applied to the production of automotive electronic water pump housings, laser welding of housing components can be achieved, improving the laser welding strength of the water pump housing, and thus ensuring the sealing performance of the water pump housing.

[0035] 4. The preparation method provided by the present invention is simple, easy to mass-produce, and reduces the overall production cost. Detailed Implementation

[0036] To further understand the inventiveness and technical advancements of this invention, the preferred embodiments of this invention will be discussed in detail below with reference to examples and comparative examples.

[0037] Example: A laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition comprises the following raw materials in parts by weight: 50-65 parts high-temperature resistant nylon matrix, 30-36 parts modified chopped glass fiber, 3-10 parts LCP resin, 0.5-2 parts anti-hydrolysis agent, 0.3-1.0 parts hyperbranched nylon, 0.5-3 parts laser transmission modifier, 0.5-1.0 parts heat stabilizer, and 0.1-1.0 parts lubricant.

[0038] The high-temperature resistant nylon matrix is ​​a semi-aromatic high-temperature nylon, which is PA10T or PA10T combined with at least one of PA5T, PA6T, PA9T, PA10T / 10I, PA11T, PA12T, PA13T, PA10N, PA11N, PA12N, PA13N, and PA13B.

[0039] The LCP resin is at least one of Polyplastics A430, Ticona A950, Polyplastics A950, Celanese A950, Celanese S475, Polyplastics S475, Ticona S625, Celanese V200P, Celanese V400P, Sumitomo E6808THF-NC, and Nanjing Qingyan L10.

[0040] The hyperbranched nylon is at least one of HyPer C100, HyPer C181, HyPer C182, and HyPer C182D.

[0041] Modified chopped glass fibers include modified SGF and modified LGF. Among them, the length of modified LGF is 5-7 mm, and modified LGF accounts for 20-40% of the total mass of modified chopped glass fibers.

[0042] Preparation method of modified chopped glass fiber: First, weigh LGF and SGF according to the ratio and disperse them in deionized water for ultrasonic cleaning. After filtration and rinsing, place them in a mercaptosilanol aqueous solution for ultrasonic dispersion treatment. After filtration, rinsing, and drying, obtain mercaptosilane@SGF / LGF. Then, disperse mercaptosilane@SGF / LGF in deionized water, add 1-5 wt% of methacryloyloxysilane modified nano-alumina and 0.1-0.5 wt% of photoinitiator, and perform mercapto-alkene click chemistry for 3-15 min under ultrasonic dispersion and ultraviolet light irradiation. After filtration, rinsing, and drying, obtain modified chopped glass fiber with nano-alumina coating on the surface.

[0043] Furthermore, after the preparation of modified chopped glass fibers with nano-alumina coating, the α,β-unsaturated double bonds in the acryloyloxy group of the modified chopped glass fibers with nano-alumina coating undergo a Michael addition reaction with the terminal amino groups in the terminal amino hyperbranched polyamide. This results in the terminal amino hyperbranched polyamide being grafted onto the nano-alumina on the surface of the modified chopped glass fibers, which can further improve the uniformity of the dispersion of the modified chopped glass fibers in the resin matrix and improve the processing fluidity of the extruded melt.

[0044] The anti-hydrolysis agent is a polymeric carbodiimide and / or a bisoxazoline compound.

[0045] The heat stabilizers are copper salt / potassium halide complexes and / or aromatic amine antioxidants.

[0046] The lubricant is a compound of at least one of the following: flake molybdenum disulfide, flake tungsten disulfide, boron nitride nanosheets, flake graphite, and graphene, combined with at least one of EBS, silicone powder, and lignite wax.

[0047] The laser transmission modulation aid is at least one of the following: hyperbranched polyesteramine, aniline black, nano carbon black, nano titanium dioxide, nano titanium nitride, rare earth-doped nano yttrium oxide, nano zinc oxide, nano tungsten oxide, nano cobalt oxide, nano tungsten sulfide, and MAX phase ceramic powder.

[0048] A method for preparing a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition includes the following steps:

[0049] Step 1: Synthesis of modified chopped glass fibers;

[0050] At the same time, the high-temperature resistant nylon matrix and LCP resin were dried separately.

[0051] Step 2: According to the formula, add the dried high-temperature resistant nylon matrix, LCP resin, hyperbranched nylon, anti-hydrolysis agent, laser transmission modifier, heat stabilizer and lubricant to a high-speed mixer and mix evenly to obtain a mixture.

[0052] Step 3: The mixture obtained in Step 2 is added to the feed port of the twin-screw extruder. The modified chopped glass fibers synthesized in Step 1 are added from the side feed port of the twin-screw extruder. The mixture is then subjected to twin-screw shear melt extrusion with the following extrusion parameters: Zone 1: 150-170℃; Zone 2: 295-305℃; Zone 3: 310-315℃; Zone 4: 310-315℃; Zone 5: 320-330℃; Zone 6: 320- The temperature is set at 330℃, zone 7 is 325-335℃, zone 8 is 325-335℃, zone 9 is 325-335℃, the die head temperature is 325-335℃, the vacuum degree is 0.04-0.06MPa, the feeding frequency is 10-30Hz, and the process of drawing, water cooling, and pelletizing yields a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition. The resulting laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition can be injection molded to produce an automotive electronic water pump housing.

[0053] Preparation Example 1: PA10T / 10I was synthesized by one-step melt polymerization, and the steps are as follows:

[0054] S1. Weigh out decanediamine, terephthalic acid, and isophthalic acid according to the molar ratio of decanediamine: terephthalic acid: isophthalic acid of 1:0.95:0.05, and add benzoic acid as a polymerization inhibitor. The content of benzoic acid is 0.03 times the molar mass of decanediamine. After mixing evenly, add it to a 5L high-pressure reactor.

[0055] S2. Add 100mL of boiled deionized water to the high-pressure reactor, seal the high-pressure reactor, replace the air in the reactor with nitrogen 5 times, then release nitrogen into the high-pressure reactor until the pressure is 0.2MPa, turn on the stirrer, control the stirring speed to 40r / min, and start heating at the same time to raise the temperature in the reactor to 90℃ within 30min, and then maintain it at a constant temperature for 1.0h.

[0056] S3 was heated to 280℃ within 1.5h, and the pressure inside the vessel was maintained at 2MPa by releasing water vapor, and the temperature and pressure (280℃ / 2MPa) were kept constant for 1.5h.

[0057] S4. After the reaction is complete, release the gas at a rate of 0.2 MPa / 5.0 min to reduce the pressure inside the vessel to atmospheric pressure. Then, evacuate the vessel to reduce the pressure inside to -0.09 MPa and continue the reaction until a fixed current is reached. Set the discharge current to 0.5 A.

[0058] S5. After reaching the set discharge current, release nitrogen gas into the high-temperature and high-pressure reactor to 0.20 MPa, turn off the stirring, discharge the material, cool it with water, and granulate it to obtain an intrinsic viscosity of 88.15 mL·g. -1 PA10T / 10I polymer.

[0059] Preparation Example 2: A method for preparing modified chopped glass fibers, comprising the following steps:

[0060] Step 1: Add 3.0mm long glass fiber (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) and 6.0mm long glass fiber (Taishan Glass Fiber Co., Ltd., specification ECS10-6.0-T435N) to the reactor at a mass ratio of 7:3. Add 20 times the mass of glass fiber and deionized water to the reactor. Stir magnetically at 60rpm for 10min. Add 2 times the mass of glass fiber and acetone. Install an ultrasonic stirring and mixing vibrating rod on the reactor and perform ultrasonic cleaning for 30min at an ultrasonic power of 800W and an ultrasonic frequency of 20kHz. After ultrasonic cleaning, filter and rinse three times with deionized water. Then place in a vacuum drying oven, evacuate, and heat to 100℃ for vacuum drying for 4.0h to complete the chopped glass fiber cleaning process.

[0061] Simultaneously prepare a mercaptosilanol aqueous solution: Ethanol and deionized water are mixed evenly at an alcohol-to-water volume ratio of 9 / 1 to obtain an alcohol-to-water solution. Add γ-mercaptopropyltriethoxysilane KH592 (CAS: 14814-09-6, Hangzhou Jessica Chemical Co., Ltd.) to adjust the KH592 content in the mixture to 1.0 wt%. Add glacial acetic acid to adjust the pH value to 4.5 to obtain a KH592 alcohol-to-water solution.

[0062] Simultaneously prepare a methacryloyloxysilane aqueous solution: Ethanol and deionized water are mixed evenly at a volume ratio of 9 / 1 to obtain an alcohol-water solution. Add 3-methacryloyloxypropyltriethoxysilane KH574 (CAS: 21142-29-0, Hangzhou Jessica Chemical Co., Ltd.) to adjust the KH574 content in the mixture to 1.0 wt%. Add glacial acetic acid to adjust the pH value to 4.0 to obtain a KH574 alcohol-water solution.

[0063] Step 2: Add 100 parts by weight of KH592 alcohol-water solution to a large beaker, adjust the temperature to 50℃, add 5 parts by weight of the short-cut glass fiber that has been cleaned in Step 1 to the large beaker, stir magnetically at 60 rpm for 10 min, add an ultrasonic stirring and mixing vibrating rod, and perform ultrasonic cleaning for 45 min with an ultrasonic power of 800W and an ultrasonic frequency of 20kHz. Filter, rinse three times with deionized water, and then place in a vacuum drying oven, evacuate, and heat to 100℃ for vacuum drying for 4.0 h to obtain KH592@short-cut glass fiber.

[0064] Simultaneously, KH574@nano alumina was prepared: 100 parts by weight of KH574 alcohol-water solution were added to a large beaker, the temperature was adjusted to 50℃, and 5 parts by weight of nano alumina LF-A1203-N20 (spherical, average particle size 20nm, Ningbo Luofei Nanotechnology Co., Ltd.) were added to the large beaker. The mixture was magnetically stirred at 60rpm for 10min, and an ultrasonic stirring and mixing vibrating rod was added. The mixture was ultrasonically cleaned for 45min with an ultrasonic power of 800W and an ultrasonic frequency of 20kHz. After filtration, the mixture was rinsed three times with deionized water, and then placed in a vacuum drying oven. The oven was then evacuated and heated to 100℃ for vacuum drying for 4.0h to obtain KH574@nano alumina.

[0065] Step 3: Add 100 parts by weight of deionized water to a large beaker, add 5 parts by weight of KH592@chopped glass fiber, then place the large beaker into the cleaning tank of a single-tank ultrasonic cleaner with an ultrasonic power of 800W and an ultrasonic frequency of 40kHz. Add 0.15 parts by weight of KH574@nano alumina, and after ultrasonic dispersion for 5 minutes, add 0.2g of photoinitiator, aqueous photoinitiator 2959. After ultrasonic dispersion for 5 minutes, install a UV LED line light source with a distance of 5cm between the light source and the liquid surface, a wavelength of 275nm, and an output of 100mW. Maintain UV curing under ultrasonic dispersion for 15 minutes. Graft nano alumina onto the surface of the chopped glass fiber through a mercapto-olefin click chemical reaction. Filter, rinse three times with deionized water, and then place in a vacuum drying oven. Vacuum and heat to 100℃ for vacuum drying for 4.0 hours to obtain modified chopped glass fiber with nano alumina coating on the surface.

[0066] Step 4: Add 100 parts by weight of DMF to a large beaker, add 5 parts by weight of the modified short-cut glass fiber coated with nano-alumina from Step 3 to the large beaker, add sodium ethoxide to adjust the pH of the system to 8.0, and then place the large beaker into the cleaning tank of a single-tank ultrasonic cleaner with an ultrasonic power of 800W and an ultrasonic frequency of 40kHz; Prepare the HyPer N102 solution: Add HyPer N102 to DMF and mix well to obtain a HyPer N102 solution with a concentration of 0.2wt.%. N102 solution was added to a large beaker at a dropping rate of 0.20 g / min. After the addition was complete, the ultrasonic dispersion reaction continued for 30 min. The α,β-unsaturated double bonds of the acryloyloxy group in the modified short-cut glass fiber coated with nano-alumina underwent a Michael addition reaction with the terminal amino group in the terminal amino hyperbranched polyamide, resulting in the terminal amino hyperbranched polyamide being grafted onto the nano-alumina on the surface of the modified short-cut glass fiber. The mixture was filtered, rinsed three times with deionized water, and then placed in a vacuum drying oven. Vacuum drying was carried out at 100℃ for 4.0 h to obtain HyPer N102@coated nano-alumina modified short-cut glass fiber.

[0067] The difference between Preparation Example 3 and Preparation Example 2 is as follows: In step one, glass fibers with a length of 3.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) and glass fibers with a length of 6.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-6.0-T435N) were added to the reactor at a mass ratio of 4:1. 20 times the mass of the glass fibers were added to the reactor, and the mixture was magnetically stirred at 60 rpm for 10 min. Acetone with a mass of 2 times the glass fibers was then added. An ultrasonic stirring and mixing vibrating rod was installed in the reactor, and ultrasonic cleaning was performed for 30 min at an ultrasonic power of 800 W and an ultrasonic frequency of 20 kHz. After ultrasonic cleaning, the mixture was filtered, rinsed three times with deionized water, and then placed in a vacuum drying oven. A vacuum was drawn, and the mixture was heated to 100°C and vacuum dried for 4.0 h to complete the chopped glass fiber cleaning process. The remaining steps were the same.

[0068] The difference between Preparation Example 4 and Preparation Example 2 is as follows: In step one, glass fibers with a length of 3.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) and glass fibers with a length of 6.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-6.0-T435N) were added to the reactor at a mass ratio of 3:2. 20 times the mass of the glass fibers were added to the reactor, and the mixture was magnetically stirred at 60 rpm for 10 min. Acetone with a mass of 2 times the glass fibers was then added. An ultrasonic stirring and mixing vibrating rod was installed in the reactor, and ultrasonic cleaning was performed for 30 min at an ultrasonic power of 800 W and an ultrasonic frequency of 20 kHz. After ultrasonic cleaning, the mixture was filtered, rinsed three times with deionized water, and then placed in a vacuum drying oven. Vacuum was applied, and the mixture was heated to 100°C and vacuum dried for 4.0 h to complete the chopped glass fiber cleaning process. The remaining steps were the same.

[0069] The difference between Preparation Example 5 and Preparation Example 2 is as follows: In step one, 3.0 mm long glass fibers (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) were added to the reactor. 20 times the mass of the glass fibers in deionized water were added to the reactor. The mixture was magnetically stirred at 60 rpm for 10 min. Acetone with a mass of 2 times the glass fibers was added. An ultrasonic stirring and mixing vibrating rod was installed in the reactor, and ultrasonic cleaning was performed for 30 min at an ultrasonic power of 800 W and an ultrasonic frequency of 20 kHz. After ultrasonic cleaning, the mixture was filtered, rinsed three times with deionized water, and then placed in a vacuum drying oven. Vacuum was drawn, and the temperature was raised to 100°C for vacuum drying for 4.0 h to complete the cleaning treatment of the chopped glass fibers. The remaining steps were the same.

[0070] The difference between Preparation Example 6 and Preparation Example 2 is as follows: In step one, glass fibers with a length of 3.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) and glass fibers with a length of 6.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-6.0-T435N) were added to the reactor at a mass ratio of 9:1. 20 times the mass of the glass fibers were added to the reactor, and the mixture was magnetically stirred at 60 rpm for 10 min. Acetone with a mass of 2 times the glass fibers was then added. An ultrasonic stirring and mixing vibrating rod was installed in the reactor, and ultrasonic cleaning was performed for 30 min at an ultrasonic power of 800 W and an ultrasonic frequency of 20 kHz. After ultrasonic cleaning, the mixture was filtered, rinsed three times with deionized water, and then placed in a vacuum drying oven. A vacuum was drawn, and the mixture was heated to 100°C and vacuum dried for 4.0 h to complete the chopped glass fiber cleaning process. The remaining steps were the same.

[0071] The difference between Preparation Example 7 and Preparation Example 2 is as follows: In step one, glass fibers with a length of 3.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) and glass fibers with a length of 6.0 mm (Taishan Glass Fiber Co., Ltd., specification ECS10-6.0-T435N) were added to the reactor at a mass ratio of 11:9. 20 times the mass of the glass fibers in deionized water were added to the reactor, and the mixture was magnetically stirred at 60 rpm for 10 min. Acetone with a mass of 2 times the glass fibers was then added. An ultrasonic stirring and mixing vibrating rod was installed in the reactor, and ultrasonic cleaning was performed for 30 min at an ultrasonic power of 800 W and an ultrasonic frequency of 20 kHz. After ultrasonic cleaning, the mixture was filtered, rinsed three times with deionized water, and then placed in a vacuum drying oven. A vacuum was drawn, and the mixture was heated to 100°C and vacuum dried for 4.0 h to complete the chopped glass fiber cleaning process. The remaining steps were the same.

[0072] Preparation Example 8: A method for preparing modified chopped glass fibers, comprising the following steps:

[0073] Step 1: Add 3.0mm long glass fiber (Taishan Glass Fiber Co., Ltd., specification ECS10-3.0-T435N) and 6.0mm long glass fiber (Taishan Glass Fiber Co., Ltd., specification ECS10-6.0-T435N) to a reaction vessel at a mass ratio of 4:1. Add 20 times the mass of glass fiber and deionized water to the reaction vessel. Stir magnetically at 60rpm for 10min. Add 2 times the mass of glass fiber and acetone. Install an ultrasonic stirring and mixing vibrating rod on the reaction vessel and perform ultrasonic cleaning for 30min at an ultrasonic power of 800W and an ultrasonic frequency of 20kHz. After ultrasonic cleaning, filter and rinse three times with deionized water. Then place in a vacuum drying oven, evacuate, and heat to 100℃ for vacuum drying for 4.0h to complete the chopped glass fiber cleaning process.

[0074] Simultaneously prepare a mercaptosilanol aqueous solution: Ethanol and deionized water are mixed evenly at an alcohol-water volume ratio of 9 / 1 to obtain an alcohol-water solution. Add γ-aminopropyltriethoxysilane KH550 (CAS: 919-30-2, Hangzhou Jessica Chemical Co., Ltd.) to adjust the KH592 content in the mixture to 1.0 wt%, and add glacial acetic acid to adjust the pH value to 4.0 to obtain a KH550 alcohol-water solution.

[0075] Step 2: Add 100 parts by weight of KH550 alcohol-water solution to a large beaker, adjust the temperature to 50℃, add 5 parts by weight of the short-cut glass fiber that has been cleaned in Step 1 to the large beaker, stir magnetically at 60 rpm for 10 min, add an ultrasonic stirring and mixing vibrating rod, and perform ultrasonic cleaning for 45 min with an ultrasonic power of 800W and an ultrasonic frequency of 20kHz. Filter, rinse three times with deionized water, and then place in a vacuum drying oven, evacuate, and heat to 100℃ for vacuum drying for 4.0 h to obtain KH550@short-cut glass fiber.

[0076] Example 1: A laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition is made from the following raw materials in parts by weight: 55.3 parts of PA10T (Vicnyl® R630, Guangzhou Kingfa Science & Technology Co., Ltd.), 35 parts of modified chopped glass fiber from Preparation Example 2, 5 parts of LCP resin - Polyplastics A950 (provided by Dongguan Dongju Plastics Co., Ltd.), 1.5 parts of anti-hydrolysis agent - carbodiimide (99% pure, CAS: 151-51-9, Nantong Runfeng Petrochemical Co., Ltd.), and 0.8 parts of hyperbranched nylon HyPerC. 182 (Wuhan Hyperbranched Resin Technology Co., Ltd.), 1.0 part laser transmission modifier - aniline black (CAS: 8005-02-5, Maclean, 98% pure), 0.5 part laser transmission modifier - nano tungsten disulfide ML-WS2-N50 (average particle size 50nm, Zhejiang Manli Nanotechnology Co., Ltd.), 0.8 part heat stabilizer - di[4-(1-methyl-1-phenylethyl)phenyl]amine (Naugard 445, Maclean, 98% pure), 0.2 part lubricant - flake molybdenum disulfide ML-MoS2-N100 (average particle size 100nm, Zhejiang Manli Nanotechnology Co., Ltd.), 0.2 part lubricant - ethylene bis-stearamide EBS (99% pure, CAS: 110-30-5, Nantong Runfeng Petrochemical Co., Ltd.).

[0077] A method for preparing a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition includes the following steps:

[0078] Step 1, the synthesis of modified chopped glass fibers, see Preparation Example 2;

[0079] Meanwhile, the high-temperature resistant nylon matrix was dried: Vicnyl® R630 was dried at 120℃ for 4 hours;

[0080] Meanwhile, the LCP resin was dried: LCP A950 was dried at 150℃ for 4 hours;

[0081] Step 2: According to the formula, add the dried Vicnyl® R630, LCP A950, hyperbranched nylon HyPerC182, carbodiimide, aniline black, nano tungsten disulfide ML-WS2-N50, di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, flake molybdenum disulfide ML-MoS2-N100, and ethylene bis-stearamide EBS into a high-speed mixer and mix at 400 rpm for 4 hours until the mixture is uniform and a mixture is obtained.

[0082] Step 3: The mixture obtained in Step 2 is added to the feed port of a twin-screw extruder. The modified chopped glass fibers synthesized in Step 1 are added from the side feed port of the twin-screw extruder. The mixture is then sheared and melt-extruded by the twin screw extruder. The extrusion parameters are as follows: Zone 1 temperature set at 170℃, Zone 2 temperature set at 300℃, Zone 3 temperature set at 310℃, Zone 4 temperature set at 315℃, Zone 5 temperature set at 320℃, Zone 6 temperature set at 320℃, Zone 7 temperature set at 325℃, Zone 8 temperature set at 325℃, Zone 9 temperature set at 325℃, die head temperature at 325℃, vacuum degree at 0.05MPa, and feeding frequency at 20Hz. The mixture is then stretched, water-cooled, and pelletized to obtain a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition. The obtained laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition can be injection molded to produce an automotive electronic water pump housing.

[0083] The difference between Example 2 and Example 1 is that the laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition is made from the following raw materials in parts by weight: 56.8 parts of PA10T (Vicnyl® R630), 35 parts of the modified chopped glass fiber from Example 2, 3 parts of LCP resin - Polyplastics A950, 1.5 parts of anti-hydrolysis agent - carbodiimide, 1.0 part of hyperbranched nylon HyPerC182, 1.0 part of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0084] The difference between Example 3 and Example 1 is that the laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition is made from the following raw materials in parts by weight: 50.5 parts of PA10T (Vicnyl® R630), 35 parts of the modified chopped glass fiber from Preparation Example 2, 10 parts of LCP resin - Polyplastics A950, 1.5 parts of anti-hydrolysis agent - carbodiimide, 0.3 parts of hyperbranched nylon HyPerC182, 1.0 part of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0085] The difference between Example 4 and Example 1 is that the modified chopped glass fibers in Preparation Example 2 were replaced in equal amounts with the modified chopped glass fibers in Preparation Example 3, while the other components were the same.

[0086] The difference between Example 5 and Example 1 is that the modified chopped glass fibers in Preparation Example 2 were replaced in equal amounts with the modified chopped glass fibers in Preparation Example 4, while the other components were the same.

[0087] The difference between Example 6 and Example 1 is that: a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition is made from the following raw materials in parts by weight: 56.4 parts of PA10T / 10I synthesized in Preparation Example 1, 35 parts of modified chopped glass fiber in Preparation Example 2, 4 parts of LCP resin - Polyplastics A950, 1.5 parts of anti-hydrolysis agent - carbodiimide, 0.4 parts of hyperbranched nylon HyPerC 182, 1.0 part of laser transmission modifier - aniline black, 0.5 parts of laser transmission modifier - nano tungsten disulfide ML-WS2-N50, 0.8 parts of heat stabilizer - di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of lubricant - flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0088] The difference between Comparative Example 1 and Example 1 is that the nylon composition was made from the following raw materials in parts by weight: 60.3 parts of PA10T (Vicnyl® R630), 35 parts of the modified chopped glass fiber from Preparation Example 2, 1.5 parts of anti-hydrolysis agent - carbodiimide, 0.5 parts of hyperbranched nylon HyPerC 182, 1.0 part of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0089] The difference between Comparative Example 2 and Example 1 is that the nylon composition was made from the following raw materials in parts by weight: 55.8 parts of PA10T (Vicnyl® R630), 35 parts of the modified chopped glass fiber from Preparation Example 2, 5 parts of LCP resin - Polyplastics A950, 1.5 parts of anti-hydrolysis agent - carbodiimide, 1.0 part of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0090] The difference between Comparative Example 3 and Example 1 is that the nylon composition was made from the following parts by weight of raw materials: 58.3 parts of PA10T (Vicnyl® R630), 35 parts of modified chopped glass fiber from Preparation Example 2, 2 parts of LCP resin - Polyplastics A950, 1.5 parts of anti-hydrolysis agent - carbodiimide, 0.5 parts of hyperbranched nylon HyPerC 182, 1.0 part of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0091] The difference between Comparative Example 4 and Example 1 is that the nylon composition was made from the following raw materials in parts by weight: 55.6 parts of PA10T (Vicnyl® R630), 35 parts of modified chopped glass fiber from Preparation Example 2, 5 parts of LCP resin - Polyplastics A950, 1.5 parts of anti-hydrolysis agent - carbodiimide, 0.2 parts of hyperbranched nylon HyPerC 182, 1.0 part of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0092] The difference between Comparative Example 5 and Example 1 is that the modified chopped glass fibers in Preparation Example 2 were replaced by 35 parts of modified chopped glass fibers in Preparation Example 5 in equal amounts, while the other components were the same.

[0093] The difference between Comparative Example 6 and Example 1 is that the modified chopped glass fibers in Preparation Example 2 were replaced by 35 parts of modified chopped glass fibers in Preparation Example 6 in equal amounts, while the other components were the same.

[0094] The difference between Comparative Example 7 and Example 1 is that the modified chopped glass fibers in Preparation Example 2 were replaced by 35 parts of the modified chopped glass fibers in Preparation Example 7 in equal amounts, while the other components were the same.

[0095] The difference between Comparative Example 8 and Example 1 is that the modified chopped glass fibers in Preparation Example 2 were replaced by 35 parts of the modified chopped glass fibers in Preparation Example 8 in equal amounts, while the other components were the same.

[0096] The difference between Comparative Example 9 and Example 1 is that the nylon composition was made from the following raw materials in parts by weight: 56.8 parts of PA10T (Vicnyl® R630), 35 parts of the modified chopped glass fiber from Preparation Example 2, 10 parts of LCP resin - Polyplastics A950, 0.3 parts of hyperbranched nylon HyPerC 182, 1.0 parts of aniline black, 0.5 parts of nano tungsten disulfide ML-WS2-N50, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0097] The difference between Comparative Example 10 and Example 1 is that the nylon composition was made from the following parts by weight of raw materials: 56.8 parts of PA10T (Vicnyl® R630), 35 parts of modified chopped glass fiber from Preparation Example 2, 10 parts of LCP resin - Polyplastics A950, 0.3 parts of hyperbranched nylon HyPerC 182, 1.5 parts of anti-hydrolysis agent - carbodiimide, 0.8 parts of di[4-(1-methyl-1-phenylethyl)phenyl]amine Naugard 445, 0.2 parts of flake molybdenum disulfide ML-MoS2-N100, and 0.2 parts of lubricant - ethylene bis-stearamide EBS.

[0098] Performance testing:

[0099] 1. Surface Quality: Visual Inspection: Under natural light or a standard light source (such as a D65 light source), observe the surface of the product for defects such as loose fibers, glass fiber agglomerates, bubbles, scorch marks, flow lines, and silver streaks. Grading and Evaluation: A 4-level appearance scoring system is adopted, as follows: Level 1: High appearance smoothness, no loose fibers, no glass fiber agglomerates; Level 2: High appearance smoothness, with a small amount of loose fibers but no agglomerates; Level 3: Average appearance smoothness, with a large amount of loose fibers or a small amount of agglomerates; Level 4: Poor appearance smoothness, with a large amount of loose fibers or a large amount of agglomerates.

[0100] 2. The notched impact strength was tested according to GB / T1843–2008, with a type A notch and a pendulum energy of 5.5J.

[0101] 3. Tensile strength was determined according to GB / T 1040.1-2025 "Determination of Tensile Properties of Plastics - Part 1: General Rules", with a test temperature of 23℃, a tensile span of 50mm, and a tensile rate of 10mm / min. The hydrolysis resistance test method is as follows: the test sample was immersed in 50% ethylene glycol / coolant at 130℃ for 1000h, then removed and placed at room temperature for 6 hours. The tensile strength was then determined according to GB / T1040.1-2025.

[0102] 4. Water absorption rate test method: Equilibrate for 48 hours in an environment of 23℃±1℃ and 50%±2% RH. Calculate the water absorption rate by the mass change before and after water absorption. Water absorption rate (%) = [(m1-m2) / m2]×100%, where m1 is the mass after water absorption and m2 is the dry constant weight mass.

[0103] 5. Test tubes with a thickness of 2 mm and an inner diameter of 45.0 mm were prepared using an extrusion process. Two test tubes were then laser-welded. After welding, the finished pipes underwent weld shear strength and burst pressure tests. The weld shear strength test involved applying a shear force parallel to the weld seam to the laser-welded sample using a special fixture on a universal testing machine until failure. The shear strength was calculated based on the maximum load and the effective shear area. The burst pressure of the finished pipes after welding was tested using a burst testing machine, and the burst pressure was recorded.

[0104] 6. The heat distortion temperature shall be determined according to Method B in GB / T 1634.2-2019. A standard extruded specimen of 127×12.7×6.35 mm shall be subjected to a three-point bending test under a static load of 1.8 MPa (Method B). The temperature at which the specimen deflection reaches 0.254 mm at a rate of 2℃ / min shall be the heat distortion temperature.

[0105] Table 1: Test parameters of nylon compositions in Examples 1-6 and Comparative Examples 1-10 Example 1 Level 1 195.2 182.9 11.69 0.43 42.0 2.1 287.1 Example 2 Level 1 189.6 172.3 12.05 0.48 40.4 2.0 285.3 Example 3 Level 1 198.1 186.9 11.16 0.40 43.6 2.2 290.2 Example 4 Level 1 188.5 175.2 10.86 0.45 40.9 2.0 286.5 Example 5 Level 1 201.1 189.2 12.37 0.42 43.1 2.2 288.3 Example 6 Level 1 190.6 180.4 12.05 0.41 41.3 2.1 285.9 Comparative Example 1 Level 2 185.3 164.7 11.12 0.54 38.7 1.8 284.5 Comparative Example 2 Level 3 183.9 166.9 9.65 0.49 39.5 1.9 285.1 Comparative Example 3 Level 2 188.5 170.8 11.35 0.47 39.8 1.9 285.7 Comparative Example 4 Level 2 186.7 170.2 10.49 0.46 40.3 2.0 286.3 Comparative Example 5 Level 1 181.5 166.2 10.38 0.49 40.5 2.0 285.9 Comparative Example 6 Level 1 187.9 173.8 9.35 0.46 41.1 2.0 286.4 Comparative Example 7 Level 2 199.7 185.1 11.98 0.42 42.6 2.1 287.9 Comparative Example 8 Level 1 187.6 171.1 11.24 0.47 37.5 1.9 285.5 Comparative Example 9 Level 1 192.4 172.1 11.58 0.48 41.7 2.1 286.7 Comparative Example 10 Level 1 193.1 180.6 11.49 0.44 3.9 0.4 286.9

[0106] Based on Examples 1 and 1, and referring to Table 1, it can be seen that adding LCP A950 can improve the mechanical properties, hydrolysis resistance, and laser welding performance of the nylon composition, reduce water absorption, and improve dimensional stability. Furthermore, adding only hyperbranched nylon HyPerC 182 resulted in a decrease in the surface quality of the nylon composition product, from grade 1 to grade 2, and the appearance of fiber floating issues. Therefore, the synergistic use of hyperbranched nylon HyPerC 182 and LCP A950 can effectively improve the processing flow properties of the extruded melt, effectively improving processing performance and product surface quality.

[0107] As can be seen from Example 1 and Comparative Example 2 and Table 1, the addition of hyperbranched nylon HyPerC 182 can significantly improve the surface quality of the nylon composition, and also helps to improve the mechanical properties, hydrolysis resistance, laser welding performance, dimensional stability and high temperature resistance of the nylon composition.

[0108] Based on Examples 1-3 and Comparative Examples 1 and 3, and in conjunction with Table 1, it can be seen that the optimal amount of LCP A950 added is 3-10 parts. If the amount of A950 added is too low, the improvement on the physicochemical properties of the nylon composition will not be significant, and it will also be detrimental to improving the processing performance of the nylon composition. If the amount of A950 added is too high, although it is beneficial to improve mechanical properties, hydrolysis resistance, dimensional stability, and high temperature resistance, the impact performance will decrease and the production cost will increase.

[0109] Based on Examples 1-3 and Comparative Examples 2 and 4, and in conjunction with Table 1, it can be seen that the amount of hyperbranched nylon HyPerC 182 added should be controlled at 0.3-1.0 parts. If the amount added is too low, the improvement of the physicochemical properties of the nylon composition will not be significant and the problem of fiber floating will not be effectively solved, and the surface quality will remain at level 2. If the amount added is too high, the cost will increase.

[0110] Based on Examples 1, 4-5, and Comparative Examples 5-7, and referring to Table 1, it is evident that the LGF glass fiber content should ideally be 20-40% of the total mass of the modified chopped glass fiber. Increasing the LGF glass fiber content improves the mechanical properties, impact strength, and hydrolysis resistance of the nylon composition, while simultaneously reducing water absorption and enhancing overall dimensional stability. Conversely, too low an LGF glass fiber content results in minimal reinforcing effect on the nylon composition, while a high LGF glass fiber content negatively impacts the extrusion flowability of the nylon composition, hindering the uniform dispersion of the modified chopped glass fiber in the resin matrix. This leads to a decline in the overall performance of the nylon composition and causes fiber floating issues in the nylon composition products, affecting their surface quality. Therefore, based on the comparison of Examples 1, 4-5, and Comparative Examples 5-7, an LGF glass fiber content of 30±2% of the total mass of the modified chopped glass fiber is optimal.

[0111] As can be seen from Example 1 and Comparative Example 8 and Table 1, the modified short-cut glass fiber with nano-alumina coating made by the present invention can be uniformly dispersed in the high-temperature resistant nylon matrix, which improves the processing performance, mechanical properties, impact strength, hydrolysis resistance and high temperature resistance of the nylon composition, while reducing water absorption and improving the overall dimensional stability.

[0112] Based on Example 1 and Comparative Example 9, and referring to Table 1, it can be seen that the tensile strength retention rate of the nylon composition in Example 1 after immersion in 50% ethylene glycol / cooling solution at 130°C for 1000 hours was 93.70%, while the tensile strength retention rate of the nylon composition in Comparative Example 9 after immersion in 50% ethylene glycol / cooling solution at 130°C for 1000 hours was <90% (89.45%). This indicates that carbodiimide significantly improves the overall hydrolysis resistance.

[0113] Based on Example 1 and Comparative Example 10, and in conjunction with Table 1, it can be seen that the combination of aniline black and nano-tungsten disulfide as a laser transmission modifier can effectively improve the laser welding performance of nylon composition products. When applied to the injection molding production of automotive electronic water pump housings, laser welding can be achieved, ensuring the sealing performance of the water pump housing.

[0114] In summary, this invention has the advantages of superior hydrolysis resistance, high temperature resistance, low water absorption, and high dimensional stability, and also has good laser welding performance. When this hydrolysis-resistant bio-based high-temperature nylon composition is applied to the injection molding production of automotive electronic water pump housings, laser welding of housing components can be achieved, giving the housing components excellent laser welding strength and ensuring the sealing performance of the water pump housing.

[0115] It should be noted that this specific embodiment is merely an explanation of the technical solution of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition, characterized in that: It is made from the following raw materials in parts by weight: 50-65 parts high-temperature resistant nylon matrix, 30-36 parts modified chopped glass fiber, 3-10 parts LCP resin, 0.3-1.0 parts hyperbranched nylon, 0.5-2 parts anti-hydrolysis agent, 0.5-3 parts laser transmission modifier, 0.5-1.0 parts heat stabilizer, and 0.1-1.0 parts lubricant.

2. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The LCP resin is at least one of Polyplastics A430, Ticona A950, Polyplastics A950, Celanese A950, Celanese S475, Polyplastics S475, Ticona S625, Celanese V200P, Celanese V400P, Sumitomo E6808THF-NC, and Nanjing Qingyan L10.

3. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The high-temperature resistant nylon matrix is ​​a semi-aromatic high-temperature nylon, which is PA10T or PA10T combined with at least one of PA5T, PA6T, PA9T, PA10T / 10I, PA11T, PA12T, PA13T, PA10N, PA11N, PA12N, PA13N, and PA13B.

4. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The hyperbranched nylon is at least one of HyPer C100, HyPer C181, HyPer C182, and HyPer C182D.

5. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The modified chopped glass fiber includes modified SGF and modified LGF, wherein the length of the modified LGF is 5-7 mm and the modified LGF accounts for 20-40% of the total mass of the modified chopped glass fiber.

6. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 5, characterized in that: The modified chopped glass fiber is prepared as follows: First, LGF and SGF are weighed according to the ratio and dispersed in deionized water for ultrasonic cleaning. After filtration and rinsing, the mixture is placed in a mercaptosilanol aqueous solution for ultrasonic dispersion treatment. After filtration, rinsing, and drying, mercaptosilane@SGF / LGF is obtained. Then, mercaptosilane@SGF / LGF is dispersed in deionized water, and 1-5 wt% of methacryloyloxysilane-modified nano-alumina and 0.1-0.5 wt% of photoinitiator are added. The mixture is subjected to mercapto-alkene click chemistry for 3-15 min under ultrasonic dispersion and ultraviolet light irradiation. After filtration, rinsing, and drying, modified chopped glass fiber with nano-alumina coating is obtained.

7. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The anti-hydrolysis agent is a polymeric carbodiimide and / or a bisoxazoline compound; the heat stabilizer is a copper salt / potassium halide complex and / or an aromatic amine antioxidant.

8. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The lubricant is a compound of at least one of the following: flake molybdenum disulfide, flake tungsten disulfide, boron nitride nanosheets, flake graphite, and graphene, combined with at least one of EBS, silicone powder, and lignite wax.

9. The laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to claim 1, characterized in that: The laser transmission modulation aid is at least one of the following: hyperbranched polyesteramine, aniline black, nano carbon black, nano titanium dioxide, nano titanium nitride, rare earth-doped nano yttrium oxide, nano zinc oxide, nano tungsten oxide, nano cobalt oxide, nano tungsten sulfide, and MAX phase ceramic powder.

10. A method for preparing a laser-weldable, hydrolysis-resistant, bio-based high-temperature nylon composition according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: Synthesis of modified chopped glass fibers; At the same time, the high-temperature resistant nylon matrix and LCP resin were dried separately. Step 2: According to the formula, add the dried high-temperature resistant nylon matrix, LCP resin, hyperbranched nylon, anti-hydrolysis agent, laser transmission modifier, heat stabilizer and lubricant to a high-speed mixer and mix evenly to obtain a mixture. Step 3: The mixture obtained in Step 2 is added to the feed port of the twin-screw extruder. The modified chopped glass fibers synthesized in Step 1 are added from the side feed port of the twin-screw extruder. The mixture is then subjected to twin-screw shear melt extrusion with the following extrusion parameters: Zone 1: 150-170℃; Zone 2: 295-305℃; Zone 3: 310-315℃; Zone 4: 310-315℃; Zone 5: 320-330℃; Zone 6: 320- The temperature is set at 330℃, zone 7 is 325-335℃, zone 8 is 325-335℃, zone 9 is 325-335℃, the die head temperature is 325-335℃, the vacuum degree is 0.04-0.06MPa, the feeding frequency is 10-30Hz, and the process of drawing, water cooling, and pelletizing yields a laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition. The resulting laser-weldable hydrolysis-resistant bio-based high-temperature nylon composition can be injection molded to produce an automotive electronic water pump housing.