Lightweight impact-resistant PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) and application thereof in robot shell

Abstract

The invention discloses a lightweight impact-resistant PC / ABS and application thereof in a robot shell, and belongs to the technical field of plastic alloys, the lightweight impact-resistant PC / ABS provided by the invention comprises the following components in parts by weight: 70-90 parts of polycarbonate, 10-30 parts of ABS, 10-20 parts of PMMA, 8-10 parts of a toughening compatibilizer, 8-10 parts of modified hollow glass beads, 5-15 parts of a flame retardant, 1-3 parts of a lubricant and 0.1-2 parts of an antioxidant; according to the lightweight impact-resistant PC / ABS provided by the invention, the modified hollow glass beads and the toughening compatibilizer are added, so that the density of the PC / ABS is reduced, the impact resistance of the PC / ABS is improved, the impact resistance of the PC / ABS is improved, the impact resistance of the PC / ABS is improved, the impact resistance of the PC / ABS is improved, and the impact resistance of the PC / ABS is improved. The material is especially suitable for robot shell materials.

Description

Technical Field

[0001] This invention relates to the field of plastic alloy technology, specifically to a lightweight, impact-resistant PC / ABS and its application in robot housings. Background Technology

[0002] Depending on the specific type of robot, engineering plastics, metals, etc. can be selected as robot shell materials. Among them, PC / ABS alloy combines the impact resistance and heat resistance of PC with the easy processing and cost advantages of ABS, making it the mainstream choice for robot shells at present. In particular, reducing the overall weight is crucial for extending the robot's endurance and collaborative capabilities.

[0003] Polycarbonate (PC) is a general term for polymers containing carbonate groups in their molecular chains. It is a nearly colorless, glassy, ​​amorphous polymer with excellent optical properties, good surface gloss, and high transparency. High molecular weight PC resin has high toughness, excellent impact strength and dimensional stability, and maintains high mechanical strength over a wide temperature range. PC also exhibits better creep resistance than nylon and polyoxymethylene, with minimal dimensional changes and cold flow deformation due to water absorption. Furthermore, PC has low molecular polarity, a high glass transition temperature, and low water absorption, resulting in excellent electrical insulation properties. PC also has exceptionally high dielectric strength, high corona resistance, and its electrical properties are almost unaffected by temperature, exhibiting high heat resistance, making it an excellent high-frequency insulating material. However, the high rigidity and large steric hindrance of the PC molecular chain lead to high melt viscosity, making processing difficult. Furthermore, the resulting products have high residual stress, making them prone to stress cracking. Additionally, its solvent resistance and abrasion resistance are relatively poor. ABS is a terpolymer of acrylonitrile, butadiene, and styrene, possessing excellent mechanical properties that balance toughness, hardness, and rigidity. ABS resin's properties fall between those of engineering plastics and general-purpose plastics, exhibiting good molding and processing properties, mechanical properties, and chemical resistance, but its flammability and weather resistance are relatively poor.

[0004] PC / ABS alloy is the earliest industrialized PC alloy product and one of the most important PC alloys. The compatibility between the two components in a PC / ABS blend determines the full utilization of the mechanical properties of each component in the composite material. The similarity of polymer molecular structures in the blend increases intermolecular compatibility, and both PC and ABS molecular chains contain a large number of benzene ring structures. From a thermodynamic perspective, PC / ABS blends can be considered as blends of PC, SAN, and PB. PC has good compatibility with SAN resin but poor compatibility with PB rubber. SAN is the main component of ABS resin and is a continuous phase; therefore, PC and ABS have a certain degree of compatibility, which increases with increasing SAN content. However, to obtain an alloy with excellent impact resistance, increasing the rubber content is necessary. Hollow glass microspheres are a type of micron-sized lightweight material with advantages such as light weight, low thermal conductivity, high strength, and good chemical stability. Their density is much lower than that of various plastic materials. Combining hollow glass microspheres with plastic materials holds promise for preparing lightweight and high-strength plastic materials. However, hollow glass microspheres are extremely prone to breakage during the processing and shearing of the extruder, which can easily lead to the appearance of voids and pores, thereby reducing the mechanical properties of the composite material. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the present invention provides a lightweight and impact-resistant PC / ABS and its application in robot shells. By adding modified hollow glass microspheres and toughening and compatibilizing agents to the PC / ABS alloy, the PC / ABS alloy has the advantages of being lightweight and impact-resistant.

[0006] This invention is achieved through the following technical solution: A lightweight, impact-resistant PC / ABS comprises, by weight, the following components: 70-90 parts polycarbonate, 10-30 parts ABS, 10-20 parts PMMA, 8-10 parts toughening and compatibilizing agent, 8-10 parts modified hollow glass microspheres, 5-15 parts flame retardant, 1-3 parts lubricant, and 0.1-2 parts antioxidant; the toughening and compatibilizing agent is a copolymer of branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate, and N-phenylmaleimide in a mass ratio of (40-60):(10-30):(10-30):(3-8):(2-7); the modified hollow glass microspheres are obtained by pretreatment with sodium hydroxide hydroxylation of coarse, medium, and fine-sized hollow glass microspheres, followed by surface treatment with epoxy silane coupling agent and terminal amino-branched polysiloxane.

[0007] Preferably, the hollow glass microspheres have a coarse particle size of 29-32 μm, a medium particle size of 10-12 μm, and a fine particle size of 5-6 μm.

[0008] Preferably, the mass ratio of coarse, medium and fine hollow glass microspheres is 1:(2~3):(8~10).

[0009] Preferably, the branched polysiloxane is prepared by condensation of methyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane and hexamethyldisiloxane under acidic conditions after hydrolysis.

[0010] Preferably, the terminal amino-branched polysiloxane is prepared by condensation of methyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane and 1,3-bis(3-aminopropyl)tetramethyldisiloxane under acidic conditions after hydrolysis.

[0011] More preferably, the molar ratio of methyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane and hexamethyldisiloxane is 100:(3~10):(0.5~7), and the number average molecular weight of the branched polysiloxane is 4000~40000 g / mol.

[0012] More preferably, the molar ratio of methyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane and 1,3-bis(3-aminopropyl)tetramethyldisiloxane is 100:(3~10):(3~10), and the number average molecular weight of the terminal amino-branched polysiloxane is 4000~9000 g / mol.

[0013] Specifically, the molecular weight of polysiloxane can be controlled by adjusting the amount of end-capping groups added.

[0014] Preferably, the mass ratio of the branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide is 50:20:20:5:5.

[0015] Preferably, the branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide are copolymerized with an initiator through a two-stage extruder system and then extruded.

[0016] More preferably, the initiator is azobisisobutyronitrile, and the amount of initiator added is 0.3 to 0.6 wt% of the total mass of branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide monomers.

[0017] Preferably, the pretreatment step of hydroxylation of hollow glass microspheres with sodium hydroxide involves immersing the hollow glass microspheres in a 5 mol / L sodium hydroxide solution, allowing them to stand at 120°C for 12 hours, diluting the treated microspheres with deionized water until the solution is neutral, filtering, and drying in a vacuum oven at 80°C to obtain hydroxylated hollow glass microspheres.

[0018] Preferably, the mass ratio of hydroxylated hollow glass microspheres to epoxy silane coupling agent is 1:(1~10).

[0019] Preferably, the PC resin is bisphenol A type polycarbonate, and its melt index measured at 300°C and 1.2K is 5~20g / 10min.

[0020] Preferably, the melt index of ABS resin measured at 220℃ and 10kg is 5~35g / 10min. The melt index of ABS resin can be measured according to ISO 1133-2011.

[0021] Preferably, the antioxidant includes at least one of hindered phenolic antioxidants, diphenylamine antioxidants, amine antioxidants, sodium hydrogen phosphate antioxidants, or phosphites; the flame retardant is a phosphorus-based flame retardant; and the lubricant includes at least one of silicone lubricants, ester lubricants, amide lubricants, or polyethylene lubricants.

[0022] This invention also protects the method for preparing the aforementioned lightweight, impact-resistant PC / ABS, comprising the following steps: (1) Weigh each raw material and mechanically mix them using a high-speed mixer to obtain a mixture; (2) The mixed material is fed into a twin-screw extruder. The modified hollow glass microspheres are fed from the side feed port of the extruder in a side-feed manner and granulated by extrusion through the twin-screw extruder. The extrusion granulation temperature is 180-270℃. The screw length-to-diameter ratio of the extruder used for melt extrusion is 45-50:1 and the screw speed is 100-200r / min.

[0023] This invention also protects the application of the aforementioned lightweight, impact-resistant PC / ABS in robot housings.

[0024] Beneficial effects

[0025] This invention provides a lightweight, impact-resistant PC / ABS material with the following advantages: (1) This invention utilizes a three-gradient hollow glass microsphere system (coarse, medium, and fine) to fill the microspheres with a particle size gradient. This fully leverages the weight reduction effect of the hollow glass microspheres while reducing the porosity between fillers and improving the density of the matrix. The gradient-graded hollow glass microspheres can also disperse stress during processing, reducing the breakage rate of coarse-sized hollow glass microspheres. To further reduce the breakage of hollow glass microspheres during processing, this invention activates the surface hydroxyl groups of the hollow glass microspheres through hydroxylation treatment, then modifies the surface with an epoxy silane coupling agent, and finally uses terminal amino-branched polysiloxane to form a coating layer on the surface of the hollow glass microspheres. During the raw material processing stage, the amino groups on the terminal amino-branched polysiloxane covalently crosslink with the epoxy groups on the silane coupling agent, forming a uniform, elastic, impact-resistant protective layer on the surface of the hollow glass microspheres. This reduces the density of the PC / ABS alloy while ensuring its impact resistance.

[0026] (2) Toughening and compatibilizing agents are introduced into the PC / ABS alloy. These agents are prepared by copolymer extrusion of branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate, and N-phenylmaleimide. Methacrylate is compatible with PMMA, 3-methoxystyrene is compatible with PC and ABS, and branched polysiloxane is compatible with modified hollow glass microspheres. Simultaneously, the epoxy groups on glycidyl methacrylate can covalently react with the terminal hydroxyl groups of PC or the unreacted amino groups on the surface of modified hollow glass fibers, further enhancing the compatibilizing effect. Furthermore, branched polysiloxane provides flexible segments, and N-phenylmaleimide enhances rigidity and heat resistance, forming a "rigid-flexible" network that significantly improves impact strength. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the modification reaction of modified hollow glass microspheres; Figure 2 A schematic diagram of the reaction process for toughening and compatibilizing agents; Figure 3 Infrared spectra of amino-branched polysiloxane, branched polysiloxane, and toughening and compatibilizing agents. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Unless otherwise specified, the experimental methods used in the embodiments are conventional methods, and the materials and reagents used are commercially available unless otherwise specified.

[0030] The raw materials used in the examples and comparative examples are described below: Polycarbonate: WONDERLITE PC-110, Chi Mei Corporation of Taiwan, China, melt index 11g / 10min (300℃, 1.2kg). ABS: PA-757 AB, melt index 19kg / 10min (220℃, 10kg), Chi Mei Corporation, Taiwan; PMMA: DR101, Arkema, France; Epoxysilane coupling agent: 3-glycidyl etheroxypropyltrimethoxysilane (KH-560), Shanghai Maclean Biochemical Technology Co., Ltd.; Hollow glass microspheres 1: HS38, D50 (μm): 30; Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd.; Hollow glass microspheres 2: HS70, D50 (μm): 10, Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd.; Hollow glass microspheres 3: HM10, D50 (μm): 5, Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd.; Hollow glass microspheres 4: HS22, D50 (μm): 45, Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd.; Commercially available toughening agents: MBS, methyl methacrylate-butadiene-styrene copolymer, MBS 631, INEOS styrene-co-p-ethyl; Flame retardant: Bisphenol A-bis(diphenyl phosphate), WSFR-BDP-N2, Zhejiang Wansheng Technology Co., Ltd.; Lubricant: Pentaerythritol stearate, commercially available; Antioxidant: A mixture of antioxidant 168 and antioxidant 1010 in a 1:1 mass ratio, commercially available; Branched polysiloxane: 1 mol of methyltriethoxysilane, 0.052 mol of tetramethyltetravinylcyclotetrasiloxane, and 0.013 mol of hexamethyldisiloxane were added to a reaction vessel. 2.4 wt% of 12 mol / L concentrated hydrochloric acid and 2.2 mol of deionized water were added dropwise through a constant pressure funnel. After reacting at 90 °C for 3 h, the mixture was washed at least twice with a mixture of saturated sodium bicarbonate aqueous solution and ethanol to separate the oil layer. The product was then vacuum dried to obtain branched polysiloxane. The number-average molecular weight was determined to be 19650 g / mol by gel permeation chromatography (GPC) using a Waters 515 gel permeation chromatograph (25 °C, tetrahydrofuran as solvent, sample concentration 5 mg / ml). Amino-branched polysiloxane: 1 mol of methyltriethoxysilane, 0.052 mol of tetramethyltetravinylcyclotetrasiloxane, and 0.064 mol of 1,3-bis(3-aminopropyl)tetramethyldisiloxane were added to a reaction vessel. 2.4 wt% of 12 mol / L concentrated hydrochloric acid and 2.2 mol of deionized water were added dropwise through a constant-pressure funnel. After reacting at 90℃ for 3 h, the mixture was washed at least twice with a mixture of saturated sodium bicarbonate aqueous solution and ethanol to separate the oil layer. The mixture was then vacuum dried to obtain amino-branched polysiloxane. The number-average molecular weight was determined to be 4780 g / mol by gel permeation chromatography (GPC) using a Waters 515 gel permeation chromatograph (25℃, tetrahydrofuran as solvent, sample concentration 5 mg / ml). Modified hollow glass microspheres 1: self-made, preparation method is as follows: S1. Hollow glass microspheres 1, 2, and 3 in a mass ratio of 1:2:8 were immersed in a 5 mol / L sodium hydroxide solution and allowed to stand at 120°C for 12 hours. The treated microspheres were diluted with deionized water until the solution was neutral, then filtered and dried in a vacuum oven at 80°C to obtain hydroxylated hollow glass microspheres 1. S2. Add 10 g of hydroxylated hollow glass microspheres 1 to 100 mL of ethanol aqueous solution (anhydrous ethanol and deionized water are mixed at a volume ratio of 9:1), and stir until the hydroxylated hollow glass microspheres 1 are uniformly dispersed. Then add 10 g of epoxy silane coupling agent, stir for 4 hours, let stand for 24 hours, wash once with deionized water, filter, place in a vacuum drying oven, and dry at 50 °C for 2 hours to obtain silane coupling agent modified hollow glass microspheres 1; S3. Dilute the terminal amino-branched polysiloxane in toluene to a volume fraction of 50%. Gradually add the silane coupling agent-modified hollow glass microspheres 1 to the diluted terminal amino-branched polysiloxane solution at a volume fraction of 20%. Add triethylamine as a catalyst, stir the reaction for 4 hours, cool, wash three times with an equal volume of diethyl ether to remove the catalyst, and then place it in a vacuum drying oven and dry at 50°C for 12 hours to remove toluene, obtaining modified hollow glass microspheres 1; the modification reaction flow chart is shown below. Figure 1 As shown.

[0031] Modified hollow glass microspheres 2: self-made. The difference between modified hollow glass microspheres 1 and modified hollow glass microspheres 2 is that hollow glass microspheres 1, 2 and 3 with a mass ratio of 1:2:8 are replaced with hollow glass microspheres 1 with the same total mass and single particle size. Modified hollow glass microspheres 3: self-made. The difference between modified hollow glass microspheres 1 and modified hollow glass microspheres 4 is that hollow glass microspheres 1 are replaced with hollow glass microspheres 4. Modified hollow glass microspheres 4: self-made, the difference from modified hollow glass microspheres 1 is that the coating in step S3 is not performed; Toughening and compatibilizing agent: self-made, preparation method is as follows: As shown in Table 1, monomers and initiators (azobisisobutyronitrile, AIBN, 0.4 wt%) in different proportions were mixed in tank A and extruded through a two-stage extruder system. The first stage extruder was a TDE-40 co-rotating twin-screw extruder (diameter 41.3 mm, length-to-diameter ratio 68), and the second stage extruder was a TDY-40 counter-rotating close-meshing twin-screw extruder (diameter 41 mm, length-to-diameter ratio 60). Both extruders were manufactured by Nanjing Yousen Machinery Co., Ltd. and were connected in series. The mixture in tank A was injected into the first barrel of the first stage extruder through a metering pump. The metering pump controlled the feed rate and propelled the monomer solution forward. The second-stage extruder is equipped with a vacuum device located in the 10th barrel near the die to remove residual monomers from the polymerization system. Before the polymerization reaction begins, the extruder is heated to 220°C and cleaned with dry argon gas to remove impurities. The cooling water pump is then turned on to lower the temperature. When the temperature drops to 160°C, the main oil pump and screw are started, and the monomer solution is pumped into the extruder. The screw speed is gradually adjusted to 65 rpm. After 40 minutes, noodle-like copolymers begin to be extruded from the die. Once the state stabilizes, the polymer strips are granulated to obtain the toughening and compatibilizing agent. Residual monomers in the polymer are removed by the vacuum devolatilization device on the second-stage extruder.

[0032] The reaction flow diagram of the toughening and compatibilizing agent is shown below. Figure 2 As shown.

[0033] The number-average molecular weight and molecular weight distribution coefficient were determined by gel permeation chromatography (GPC) using a Waters 515 gel permeation chromatograph (25℃, tetrahydrofuran as solvent, sample concentration of 5 mg / ml), as shown in Table 1. Infrared analysis of amino-branched polysiloxane, branched polysiloxane, and toughening and compatibilizing agent 1 was performed using a Vertex 70 Fourier transform infrared spectrometer from Bruker, Germany. The purified solid powder was mixed with potassium bromide, ground, and pressed into tablets before testing. The infrared spectra are shown below. Figure 3 As shown. From Figure 3 It can be seen that amino-branched polysiloxanes, compared to branched polysiloxanes, exhibit better performance at 3350 cm⁻¹. -1 Characteristic peaks of amino groups appeared on both sides, and the structures of the two are basically the same except for the end-capping groups; while the toughening and compatibilizing agent showed a relative peak at 1740 cm⁻¹ compared to the branched polysiloxane. -1 The characteristic peak of C=O appeared on both sides, at 1620 cm⁻¹. -1 The disappearance of the characteristic peak of C=C near the double bond indicates that the double bonds have basically undergone polymerization. Additionally, at 1669 cm⁻¹... -1 The C=O stretching vibration peak of amide I band was observed at 1450-1489 cm⁻¹. -1A benzene ring skeletal vibration peak was observed at 1148 cm⁻¹. -1 Asymmetric stretching vibration peaks of COC were observed at 1020-1100 cm⁻¹. -1 The presence of the broad Si-O-Si peak indicates the successful synthesis of the toughening and compatibilizing agent.

[0034] Table 1. Monomer ratio, molecular weight, and molecular weight distribution coefficient of toughening and compatibilizing agents

[0035] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0036] Examples and Comparative Examples A lightweight, impact-resistant PC / ABS and its preparation method are described below. The weight proportions of the formulation are shown in Table 2. (1) Weigh each raw material and mechanically mix them using a high-speed mixer to obtain a mixture; The mixed material is fed into a twin-screw extruder. The modified hollow glass microspheres are fed from the side feed port of the extruder via a side-feed method. The material is then extruded and granulated by the twin-screw extruder. The screw speed of the twin-screw extruder is set to 180 rpm, and the hopper feed speed is set to 25 rpm. The temperatures of each zone are 180, 250, 250, 250, 250, 250, 255, 255℃, and the die head temperature is 260℃. The modified granules that have been blended and extruded are dried in a forced-air oven at 90°C for 6 hours, and then injection molded into various experimental specimens using an injection molding machine.

[0037] Table 2. Composition and proportions (parts by weight) of lightweight impact-resistant PC / ABS in the examples and comparative examples.

[0038] The lightweight, impact-resistant PC / ABS specimens prepared in the examples and comparative examples were injection molded and subjected to the following performance tests. The results are shown in Table 3.

[0039] 1. Density: The density was tested using the density bottle method according to GB / T 4472-2011 standard. The PC / ABS alloy was made into a rod-shaped structure with a length of 5cm and a diameter of 0.5cm. 2. Tensile strength: Tested according to ISO 527-2—2012 "Determination of tensile properties of plastics" at a speed of 50 mm / min; 3. Notched impact strength: The notched impact strength is tested at room temperature according to ISO 180-2000 standard.

[0040] 4. Flame retardancy: The flame retardant sample with a thickness of 1.5 mm was tested according to UL 94-2018 method.

[0041] 5. Heat distortion temperature: The heat distortion temperature of the sample was determined according to the method of GB / T 1634.2—2019 "Determination of load distortion temperature of plastics - Part 2: Plastics and hard rubber", with a load of 0.45 MPa and a heating rate of 120℃. Table 3 Performance test results of lightweight impact-resistant PC / ABS in the examples and comparative examples

[0042] As can be seen from Examples 1-5, the room temperature impact strength of the samples prepared in all examples is 40 kJ / m. 2 The density is above 0.95 g / cm³. 3 The following describes how PC / ABS materials modified with toughening and compatibilizing agents and modified hollow glass microspheres exhibit lightweight and impact-resistant properties. The monomer ratios of the toughening and compatibilizing agents in Comparative Examples 1-6 are not within the scope of the claims, and their impact resistance and heat resistance are affected. Comparative Example 7 uses a commercially available toughening agent; although its density is close to that of Example 1, the interfacial strength between the hollow glass microspheres, the resin matrix, and the toughening agent is low, resulting in a lower impact strength for the system. Comparative Example 8, without hollow glass microspheres, has a higher density, reaching 1.18 g / cm³. 3 Although hollow glass microspheres were added in Comparative Example 9, their particle size was not graded. The hollow glass microspheres were affected by the shear stress of the extruder, resulting in a high breakage rate and consequently, a high density and poor mechanical properties. In Comparative Example 10, the hollow glass microspheres were not coated with terminal amino-branched polysiloxane, resulting in a similarly high breakage rate and low impact strength.

[0043] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lightweight, impact-resistant PC / ABS, characterized in that, The product comprises the following components by weight: 70-90 parts polycarbonate, 10-30 parts ABS, 10-20 parts PMMA, 8-10 parts toughening and compatibilizing agent, 8-10 parts modified hollow glass microspheres, 5-15 parts flame retardant, 1-3 parts lubricant, and 0.1-2 parts antioxidant; the toughening and compatibilizing agent is a copolymer of branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate, and N-phenylmaleimide in a mass ratio of (40-60):(10-30):(10-30):(3-8):(2-7); the modified hollow glass microspheres are obtained by pretreatment with sodium hydroxide hydroxylation of coarse, medium, and fine-sized hollow glass microspheres, followed by surface treatment with epoxy silane coupling agent and terminal amino-branched polysiloxane.

2. The lightweight impact-resistant PC / ABS as described in claim 1, characterized in that, The branched polysiloxane is prepared by hydrolysis and condensation of methyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane and hexamethyldisiloxane under acidic conditions, and the terminal amino-branched polysiloxane is prepared by hydrolysis and condensation of methyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane and 1,3-bis(3-aminopropyl)tetramethyldisiloxane under acidic conditions.

3. The lightweight, impact-resistant PC / ABS as described in claim 1, characterized in that, The mass ratio of the branched polysiloxane, methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide is 50:20:20:5:

5.

4. The lightweight, impact-resistant PC / ABS as described in claim 1, characterized in that, The hollow glass microspheres have a coarse particle size of 29-32 μm, a medium particle size of 10-12 μm, and a fine particle size of 5-6 μm.

5. The lightweight, impact-resistant PC / ABS as described in claim 1, characterized in that, The mass ratio of coarse, medium and fine hollow glass microspheres is 1:(2~3):(8~10).

6. The lightweight, impact-resistant PC / ABS as described in claim 1, characterized in that, The polycarbonate is bisphenol A type polycarbonate, and its melt index measured at 300℃ and 1.2K is 5~20g / 10min.

7. The lightweight impact-resistant PC / ABS as described in claim 1, characterized in that, The melt flow index of ABS resin measured at 220℃ and 10kg was 5~35g / 10min.

8. The lightweight, impact-resistant PC / ABS as described in claim 1, characterized in that, The antioxidant includes at least one of hindered phenolic antioxidants, diphenylamine antioxidants, amine antioxidants, sodium hydrogen phosphate antioxidants, or phosphites; the flame retardant is a phosphorus-based flame retardant; and the lubricant includes at least one of silicone lubricants, ester lubricants, amide lubricants, or polyethylene lubricants.

9. The method for preparing lightweight impact-resistant PC / ABS according to any one of claims 1 to 8, characterized in that, Includes the following steps: (1) Weigh each raw material and mechanically mix them using a high-speed mixer to obtain a mixture; (2) The mixed material is fed into a twin-screw extruder. The modified hollow glass microspheres are fed from the side feed port of the extruder in a side-feed manner and granulated by extrusion through the twin-screw extruder. The extrusion granulation temperature is 180-270℃. The screw length-to-diameter ratio of the twin-screw extruder is 45-50:1 and the screw speed is 100-200r / min.

10. The application of lightweight, impact-resistant PC / ABS as described in any one of claims 1 to 8 in robot housings.

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