Lightweight impact-resistant pc / abs and its use in robot housings

Abstract

The application discloses a light anti-impact PC / ABS and application thereof in a robot shell and belongs to the technical field of plastic alloys. The light anti-impact PC / ABS provided by the application comprises the following components in parts by weight: polycarbonate 70-90 parts, ABS 10-30 parts, PMMA 10-20 parts, toughening and compatibilizing agent 8-10 parts, modified hollow glass microbead 8-10 parts, flame retardant 5-15 parts, lubricant 1-3 parts and antioxidant 0.1-2 parts. The toughening and compatibilizing agent is a copolymer of branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide. The light anti-impact PC / ABS provided by the application reduces the density of PC / ABS and improves the anti-impact performance of PC / ABS by adding the modified hollow glass microbead and the toughening and compatibilizing agent, and is especially suitable for being used in a robot shell material.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of plastic alloys, in particular to a lightweight impact-resistant PC / ABS and application of the lightweight impact-resistant PC / ABS to a robot shell. BACKGROUND

[0002] According to the specific type of the robot, engineering plastics, metals and the like can be selected as the robot shell material, wherein the PC / ABS alloy combines the impact resistance and heat resistance of PC and the easy processability and cost advantage of ABS, and is the current mainstream choice for the robot shell, and especially, reducing the overall weight is crucial for prolonging the endurance and cooperation capability of the robot.

[0003] Polycarbonate (PC) is a general term for polymers containing carbonate groups in the molecular chain, which is a glassy amorphous polymer almost colorless, has good optical properties, good surface gloss performance and high transparency. The high molecular weight resin of PC has high toughness, good impact strength and dimensional stability, and can still maintain high mechanical strength in a wide temperature range. At the same time, the creep resistance of PC is better than that of nylon and polyformaldehyde, and the dimensional change and cold flow deformation caused by water absorption are very small. In addition, the molecular polarity of PC is small, the glass transition temperature is high, and the water absorption rate is low, so it has excellent electrical insulation performance. At the same time, the dielectric strength of PC is particularly high, the corona resistance is high, and the electrical properties of PC are almost not affected by temperature, and the heat resistance is high, which is an excellent high-frequency insulating material. However, the high rigidity and large steric hindrance of the PC molecular chain, the high melt viscosity, the difficult processing, the large residual stress of the product, the easy stress cracking, the poor solvent resistance and wear resistance. ABS is a terpolymer of acrylonitrile, butadiene and styrene, and has excellent mechanical properties of balance of toughness, hardness and rigidity. The ABS resin is between engineering plastics and general plastics in performance, has good molding processability, mechanical properties and chemical resistance, but is flammable and has poor weather resistance.

[0004] PC / ABS alloy is the earliest industrialized PC alloy product, and is one of the most important PC alloys. The compatibility of the two components in the PC / ABS blend system determines the full play of the mechanical properties of each component in the composite material. The similarity of the molecular structure of the polymers in the blend system can increase the compatibility between the molecules, and both PC and ABS molecular chains contain a large number of benzene ring structures. From the thermodynamic point of view, the PC / ABS blend can be regarded as a blend of PC / SAN / PB, in which PC and SAN resin have good compatibility, but PC and PB rubber have poor compatibility. SAN accounts for the majority in ABS resin, which is the continuous phase, so PC and ABS have certain compatibility, and the compatibility increases with the increase of the content of SAN. However, it is necessary to increase the content of rubber to obtain an alloy with excellent impact resistance. Hollow glass microspheres are a kind of micron-sized lightweight materials, which have the advantages of lightweight, low thermal conductivity, high strength and good chemical stability, and the density is much lower than that of various plastic materials. It is hoped that the combination of hollow glass microspheres and plastic materials can prepare lightweight and high-strength plastic materials, but the hollow glass microspheres are easily broken in the shearing process of the extruder, which can easily lead to the appearance of cavities and pores, thereby reducing the mechanical properties of the composite material. SUMMARY

[0005] In order to overcome the deficiencies of the prior art, the present application provides a lightweight impact-resistant PC / ABS and its application in robot shell, by adding modified hollow glass microspheres and toughening and compatibilizing agent to PC / ABS alloy, so that the PC / ABS alloy has the advantages of lightweight and impact resistance.

[0006] The present application is realized by the following technical solutions:

[0007] A lightweight impact-resistant PC / ABS, by weight, comprising the following components: polycarbonate 70-90 parts, ABS 10-30 parts, PMMA 10-20 parts, toughening and compatibilizing agent 8-10 parts, modified hollow glass microspheres 8-10 parts, flame retardant 5-15 parts, lubricant 1-3 parts, antioxidant 0.1-2 parts; the toughening and compatibilizing agent is a copolymer of branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide with a mass ratio of (40-60):(10-30):(10-30):(3-8):(2-7); the modified hollow glass microspheres are obtained by pretreating the hollow glass microspheres of three sizes of coarse particle size, medium particle size and fine particle size with sodium hydroxide hydroxylation, and then surface treating with epoxy silane coupling agent and amino-terminated branched polysiloxane.

[0008] Preferably, the coarse particle size of the hollow glass microspheres is 29-32 μm, the medium particle size is 10-12 μm, and the fine particle size is 5-6 μm.

[0009] Preferably, the mass ratio of coarse particle size, medium particle size and fine particle size hollow glass microspheres is 1: (2~3): (8~10).

[0010] Preferably, the branched polysiloxane is prepared by hydrolysis and condensation of methyl triethoxysilane, tetramethyltetra-vinylcyclotetrasiloxane and hexamethyl disiloxane under acidic conditions.

[0011] Preferably, the branched polysiloxane is prepared by hydrolysis and condensation of methyl triethoxysilane, tetramethyltetra-vinylcyclotetrasiloxane and hexamethyl disiloxane under acidic conditions.

[0012] Further preferably, the molar ratio of the methyl triethoxysilane, tetramethyltetra-vinylcyclotetrasiloxane and hexamethyl disiloxane is 100: (3~10): (0.5~7), and the number average molecular weight of the branched polysiloxane is 4000~40000 g / mol.

[0013] Further preferably, the molar ratio of the methyl triethoxysilane, tetramethyltetra-vinylcyclotetrasiloxane and hexamethyl disiloxane is 100: (3~10): (0.5~7), and the number average molecular weight of the branched polysiloxane is 4000~40000 g / mol.

[0014] Specifically, the molecular weight of the polysiloxane can be controlled by controlling the amount of the end-capping group added.

[0015] Preferably, the mass ratio of the branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenyl maleimide is 50:20:20:5:5.

[0016] Preferably, the branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenyl maleimide and the initiator are subjected to copolymerization reaction and extrusion molding through a two-stage extruder system.

[0017] Further preferably, the initiator is azobisisobutyronitrile, and the amount of the initiator added is 0.3~0.6 wt% of the total mass of the branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenyl maleimide monomers.

[0018] Preferably, the hydroxylated pretreatment step of the hollow glass microspheres is soaking the hollow glass microspheres in a 5 mol / L sodium hydroxide solution, standing for 12 hours at 120℃, diluting the treated microspheres with deionized water to neutralize the solution, then filtering and drying in a vacuum oven at 80℃ to obtain the hydroxylated hollow glass microspheres.

[0019] Preferably, the mass ratio of the hydroxylated hollow glass microsphere and the epoxy silane coupling agent is 1: (1~10).

[0020] Preferably, the PC resin is bisphenol A polycarbonate, and the melt index of the PC resin is 5~20 g / 10 min at 300 ℃ and 1.2 k.

[0021] Preferably, the melt index of the ABS resin is 5~35 g / 10 min at 220 ℃ and 10 kg, and the melt index of the ABS resin can be measured according to ISO 1133-2011.

[0022] Preferably, the antioxidant includes at least one of a hindered phenol antioxidant, a diphenylamine antioxidant, an amine antioxidant, a sodium hydrogen phosphate antioxidant, or a phosphite; the flame retardant is a phosphorus-based flame retardant; and the lubricant includes at least one of a silicone lubricant, an ester lubricant, an amide lubricant, or a polyethylene lubricant.

[0023] The application also protects a preparation method of the light-weight impact-resistant PC / ABS, including the following steps:

[0024] (1) The raw materials are weighed and mechanically blended by a high-speed mixer to obtain a mixture;

[0025] (2) The mixed material is put into a double-screw extruder, the modified hollow glass microspheres are fed into the extruder from a side feeding port in a side feeding manner, and the extruder is used for melt extrusion and granulation; the temperature of the melt extrusion is 180~270 ℃; the length-diameter ratio of the screw of the extruder is 45~50:1, and the screw rotation speed is 100~200 r / min.

[0026] The application also protects the light-weight impact-resistant PC / ABS in the application of a robot shell.

[0027] Advantages

[0028] The application provides a light-weight impact-resistant PC / ABS, and has the following advantages:

[0029] (1) The present application fills the hollow glass microspheres of three levels of coarse, medium and fine through particle size gradient, fully utilizes the weight reduction effect of hollow glass microspheres, reduces the porosity between fillers, improves the density of the matrix, and the gradient grading hollow glass microspheres can also disperse stress in the processing process, reduce the breakage rate of coarse particle size hollow glass microspheres. In order to further reduce the breakage of hollow glass microspheres in the processing process, the surface of the hollow glass microspheres is hydroxylated to activate the surface hydroxyl, then the surface is modified with epoxy alkane silane coupling agent, and finally the end amino branched polysiloxane is used to form a coating layer on the surface of the hollow glass microspheres. The amino group on the end amino branched polysiloxane and the epoxy group on the silane coupling agent are covalently crosslinked to form a uniform elastic impact protection layer on the surface of the hollow glass microspheres, which reduces the density of the PC / ABS alloy while ensuring its impact resistance.

[0030] (2) By introducing toughening and compatibilizing agent into PC / ABS alloy, the toughening and compatibilizing agent is prepared by copolymerization and extrusion of branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenylmaleimide, wherein the methyl methacrylate is compatible with PMMA, the 3-methoxystyrene is compatible with PC and ABS, the branched polysiloxane is compatible with the modified hollow glass microspheres, and the epoxy group on the glycidyl methacrylate can covalently react with the terminal hydroxyl group of PC or the unreacted amino group on the surface of the modified hollow glass fiber, further improving the compatibilizing effect. And the branched polysiloxane provides flexible segments, N-phenylmaleimide enhances rigidity and heat resistance, forming a "rigid-flexible" network, and the impact strength is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The modification reaction schematic diagram of the modified hollow glass microspheres is shown in the figure.

[0032] Figure 2 The reaction process schematic diagram of the toughening and compatibilizing agent is shown in the figure.

[0033] Figure 3 The infrared spectrum of the amino branched polysiloxane, branched polysiloxane and toughening and compatibilizing agent is shown in the figure. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0035] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are commercially available unless otherwise specified.

[0036] The raw materials used in the examples and comparative examples are described as follows:

[0037] Polycarbonate: WONDERLITE PC-110, Taiwan, melt index 11 g / 10 min (300℃, 1.2 kg);

[0038] ABS: PA-757 AB, melt index 19 kg / 10 min (220℃, 10 kg), Taiwan;

[0039] PMMA: DR101, France Arkema;

[0040] Epoxy silane coupling agent: 3-glycidyl ether propyl trimethoxysilane (KH-560), Shanghai Maikelin Biochemical Technology Co., Ltd.;

[0041] Hollow glass microbeads 1: HS38, D50(μm): 30; Zhengzhou Shengleite Hollow Microbead New Material Co., Ltd.;

[0042] Hollow glass microbeads 2: HS70, D50(μm): 10, Zhengzhou Shengleite Hollow Microbead New Material Co., Ltd.;

[0043] Hollow glass microbeads 3: HM10, D50(μm): 5, Zhengzhou Shengleite Hollow Microbead New Material Co., Ltd.;

[0044] Hollow glass microbeads 4: HS22, D50(μm): 45, Zhengzhou Shengleite Hollow Microbead New Material Co., Ltd.;

[0045] Commercial toughening agent: MBS, methyl methacrylate-butadiene-styrene copolymer, MBS 631, Lingxi Benling;

[0046] Flame retardant: bisphenol A-bis (diphenyl phosphate), WSFR-BDP-N2, Zhejiang Wansheng Technology Co., Ltd.;

[0047] Lubricant: pentaerythritol stearate, commercially available;

[0048] Antioxidant: a mixture of antioxidant 168 and antioxidant 1010 in a mass ratio of 1:1, commercially available;

[0049] Branched polysiloxane: 1 mol of methyltriethoxysilane, 0.052 mol of tetramethyltetavinylcyclotetrasiloxane and 0.013 mol of hexamethyldisiloxane were added to a reaction kettle, 2.4 w.t% of 12 mol / L concentrated hydrochloric acid and 2.2 mol of deionized water were added dropwise through a constant pressure funnel, the reaction was carried out at a temperature of 90 ℃ for 3 h, then the oil layer was separated and vacuum dried after washing at least twice with a mixed solution of saturated sodium bicarbonate aqueous solution and ethanol, to obtain the branched polysiloxane; the number average molecular weight was determined by gel permeation chromatography GPC (Waters 515 gel permeation chromatograph, 25 ℃, tetrahydrofuran as solvent, sample concentration of 5 mg / ml) to be 19650 g / mol;

[0050] Amino-terminated branched polysiloxane: 1 mol of methyltriethoxysilane, 0.052 mol of tetramethyltetavinylcyclotetrasiloxane and 0.064 mol of 1,3-bis(3- aminopropyl)tetramethyldisiloxane were added to a reaction kettle, 2.4 w.t% of 12 mol / L concentrated hydrochloric acid and 2.2 mol of deionized water were added dropwise through a constant pressure funnel, the reaction was carried out at a temperature of 90 ℃ for 3 h, then the oil layer was separated and vacuum dried after washing at least twice with a mixed solution of saturated sodium bicarbonate aqueous solution and ethanol, to obtain the amino-terminated branched polysiloxane; the number average molecular weight was determined by gel permeation chromatography GPC (Waters 515 gel permeation chromatograph, 25 ℃, tetrahydrofuran as solvent, sample concentration of 5 mg / ml) to be 4780 g / mol;

[0051] Modified hollow glass microbeads 1: self-made, the preparation method is as follows:

[0052] S1. The hollow glass microbeads 1, 2 and 3 with a mass ratio of 1:2:8 were soaked in a 5 mol / L sodium hydroxide solution, and the treated microbeads were diluted with deionized water until the solution was neutral, then filtered and dried in a vacuum oven at 80 ℃, to obtain hydroxylated hollow glass microbeads 1;

[0053] S2. 10 grams of hydroxylated hollow glass microbeads 1 were added to 100 milliliters of an ethanol aqueous solution (anhydrous ethanol and deionized water were mixed in a volume ratio of 9:1), and stirred until the hydroxylated hollow glass microbeads 1 were uniformly dispersed. Then 10 grams of epoxy silane coupling agent were added, stirred for 4 hours, then left to stand for 24 hours, washed once with deionized water, filtered, and dried in a vacuum drying oven at 50 ℃ for 2 hours, to obtain silane coupling agent modified hollow glass microbeads 1;

[0054] S3. The end-amino branched polysiloxane was diluted in toluene to a volume fraction of 50%, and the hollow glass microspheres 1 modified with a silane coupling agent were gradually added to the end-amino branched polysiloxane dilution at a volume fraction of 20%, triethylamine was added as a catalyst, and the mixture was stirred for 4 hours, cooled, washed three times with an equal volume of diethyl ether to remove the catalyst, and then placed in a vacuum drying oven and dried at 50°C for 12 hours to remove the toluene, to obtain the modified hollow glass microspheres 1; the modification reaction flow chart is shown in Figure 1 .

[0055] Modified hollow glass microspheres 2: self-made, the difference from the modified hollow glass microspheres 1 is that the hollow glass microspheres 1, 2 and 3 with a mass ratio of 1:2:8 are replaced by hollow glass microspheres 1 with the same total mass and a single particle size;

[0056] Modified hollow glass microspheres 3: self-made, the difference from the modified hollow glass microspheres 1 is that the hollow glass microspheres 1 are replaced by hollow glass microspheres 4;

[0057] Modified hollow glass microspheres 4: self-made, the difference from the modified hollow glass microspheres 1 is that the coating in step S3 is not performed;

[0058] Toughening and compatibilizing agent: self-made, the preparation method is as follows:

[0059] As shown in Table 1, different proportions of monomers and initiator (azobisisobutyronitrile, AIBN, 0.4wt%) were mixed in an A tank, and extruded by a two-stage extruder system, wherein the first-stage extruder was a TDE-40 type co-rotating twin-screw extruder (diameter 41.3 mm, length-diameter ratio 68), and the second-stage extruder was a TDY-40 type counter-rotating tight intermeshing twin-screw extruder (diameter 41 mm, length-diameter ratio 60), both produced by Nanjing You Sen Machinery Co., Ltd., and connected in series; the mixture in the A tank was injected into the first barrel of the first-stage extruder by a metering pump, which controlled the feeding speed and pushed the monomer solution forward. The second-stage extruder was equipped with a vacuum device at the 10th barrel near the die, which was used to remove the residual monomers in the polymerization system; before the polymerization reaction started, the extruder was heated to 220°C, and the inside was cleaned of impurities with dry argon, then the cooling water pump was started to cool down, and when the temperature dropped to 160°C, the main machine oil pump and screw were started, then the monomer solution was pumped into the extruder, and the screw speed was gradually adjusted to 65 rpm. After 40 minutes, the noodle-shaped copolymer began to be extruded from the die, and after the state was stable, the polymer strip was cut into particles to obtain the toughening and compatibilizing agent, and the residual monomers in the polymer were removed by the vacuum devolatilization device on the second-stage extruder.

[0060] The reaction flow chart of the toughening and compatibilizing agent is shown in Figure 2 .

[0061] 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.

[0062] 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. -1 A 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.

[0063] Table 1. Monomer ratio, molecular weight, and molecular weight distribution coefficient of toughening and compatibilizing agents

[0064]

[0065] 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.

[0066] Examples and Comparative Examples

[0067] A lightweight, impact-resistant PC / ABS and its preparation method are described below. The weight proportions of the formulation are shown in Table 2.

[0068] (1) Weigh each raw material and mechanically mix them using a high-speed mixer to obtain a mixture;

[0069] The mixed material was put into a double screw extruder, the modified hollow glass microspheres were fed from the side feeding port of the extruder in a side feeding manner, and were extruded and granulated by the double screw extruder. The screw rotation speed of the double screw extruder was set to 180 rpm, and the hopper feeding rotation speed was set to 25 rpm. The temperatures of the respective zones were 180, 250, 250, 250, 250, 250, 250, 255, 255, 255 °C, and the die head temperature was 260 °C.

[0070] The modified granules obtained by blending and extrusion were dried in a forced air oven at 90 °C for 6 hours, and various samples required for experiments were injection molded.

[0071] Table 2 Composition and ratio of lightweight impact-resistant PC / ABS of examples and comparative examples (parts by weight)

[0072]

[0073] The lightweight impact-resistant PC / ABS prepared in the examples and comparative examples was injection molded into a sample bar, and the following performance tests were conducted, and the results are shown in Table 3, respectively.

[0074] 1. Density: The PC / ABS alloy was tested by the density bottle method of GB / T 4472-2011 standard, and the rod-shaped structure with a length of 5 cm and a diameter of 0.5 cm was prepared;

[0075] 2. Tensile strength: tested according to ISO 527-2—2012 “Determination of the tensile properties of plastics” at a speed of 50 mm / min;

[0076] 3. Notched impact strength: tested according to ISO 180-2000 standard at room temperature.

[0077] 4. Flame retardancy: tested according to UL 94-2018 method for flame retardant samples with a thickness of 1.5 mm.

[0078] 5. Heat distortion temperature: the load distortion temperature of the sample was determined according to the method of GB / T 1634.2—2019 “Determination of the load distortion temperature of plastics Part 2: Plastics and ebonite”, the load was 0.45 MPa, and the temperature rising rate was 120 °C;

[0079] Table 3 Performance test results of lightweight impact-resistant PC / ABS of examples and comparative examples

[0080]

[0081] As can be seen from Examples 1 to 5, the room temperature impact strength of the samples prepared in all examples is greater than 40 kJ / m 2 Above, the density is 0.95 g / cm 3The following describes the lightweight and impact-resistant effect of the PC / ABS material modified by the toughening compatibilizer and the modified hollow glass microspheres. The monomer ratio of the toughening compatibilizer in Comparative Examples 1-6 is not within the protection scope of the claims, and the impact resistance or heat resistance is affected. In Comparative Example 7, a commercially available toughening agent is used, although the density is close to that of Example 1, the interfacial strength of the hollow glass microspheres and the resin matrix and the toughening agent is not high, so the impact strength of the system is low. In Comparative Example 8, no hollow glass microspheres are added, and the density is higher, reaching 1.18 g / cm 3 In Comparative Example 9, although the hollow glass microspheres are added, the particle size is not added according to the gradation, the hollow glass microspheres are affected by the shear stress of the extruder, the breakage rate is higher, which leads to a higher density and poorer mechanical properties. In Comparative Example 10, the hollow glass microspheres are not coated with the amino-terminated branched polysiloxane, and the breakage rate is also high and the impact strength of the material is low.

[0082] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the specification. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their entire scope and equivalents.

Claims

1. A lightweight impact-resistant PC / ABS, characterized in that, By weight parts, including the following components: polycarbonate 70~90 parts, ABS 10-30 parts, PMMA 10~20 parts, toughening compatibilizer 8~10 parts, modified hollow glass microsphere 8~10 parts, flame retardant 5~15 parts, lubricant 1~3 parts, antioxidant 0.1~2 parts;The toughening compatibilizer is a copolymer of branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenyl maleimide with a mass ratio of (40~60): (10~30): (10~30): (3~8): (2~7); The modified hollow glass microsphere is a hollow glass microsphere which is pretreated by hydroxylation with sodium hydroxide, and then surface treated with an epoxy silane coupling agent and an amino-terminated branched polysiloxane; The branched polysiloxane is prepared by hydrolysis and condensation of methyl triethoxysilane, tetramethyl tetraethenyl cyclosiloxane and hexamethyl disiloxane under acidic conditions; The amino-terminated branched polysiloxane is prepared by hydrolysis and condensation of methyl triethoxysilane, tetramethyl tetraethenyl cyclosiloxane and 1,3-bis(3-aminopropyl)tetramethyldisiloxane under acidic conditions.

2. The lightweight impact-resistant PC / ABS of claim 1, wherein, The mass ratio of the branched polysiloxane, methyl methacrylate, 3-methoxystyrene, glycidyl methacrylate and N-phenyl maleimide is 50:20:20:5:

5.

3. The lightweight impact-resistant PC / ABS of claim 1, wherein, The coarse particle size of the hollow glass microsphere is 29~32μm, the medium particle size is 10~12μm, and the fine particle size is 5~6μm.

4. The lightweight impact-resistant PC / ABS of claim 1, wherein, The mass ratio of the coarse particle size, medium particle size and fine particle size hollow glass microspheres is 1: (2~3): (8~10).

5. The lightweight impact-resistant PC / ABS of claim 1, wherein, The polycarbonate is bisphenol A polycarbonate, and the melt index measured at 300℃, 1.2k is 5~20g / 10min.

6. The lightweight impact-resistant PC / ABS of claim 1, wherein, The melt index of the ABS resin measured at 220℃, 10kg is 5~35g / 10min.

7. The lightweight impact-resistant PC / ABS of claim 1, wherein, The antioxidant includes at least one of hindered phenolic antioxidants, amine antioxidants, sodium hydrogen phosphate antioxidants or phosphite esters; the flame retardant is a phosphorus-based flame retardant; the lubricant includes at least one of silicone lubricants, ester lubricants, amide lubricants or polyethylene lubricants.

8. The method of producing a lightweight impact-resistant PC / ABS according to any one of claims 1 to 7, characterized in that, Including the following steps: (1) Weigh each raw material and mechanically blend it with a high-speed mixer to obtain a mixture; (2) Put the mixed material into a double screw extruder, and feed the modified hollow glass microspheres into the side feeding port of the extruder in a side feeding manner, then extrude and granulate them through the double screw extruder; the temperature of the extrusion granulation is 180~270℃; the length-diameter ratio of the screw of the double screw extruder is 45~50:1, and the screw rotation speed is 100~200r / min.

9. The use of the lightweight impact-resistant PC / ABS of any one of claims 1~7 in a robot shell.

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