Composite ABS material for lead-acid storage battery shell

Abstract

The invention discloses a composite ABS (Acrylonitrile Butadiene Styrene) material for a lead-acid storage battery shell, and belongs to the technical field of high polymer materials. The invention relates to a composite ABS material for a lead-acid storage battery shell. The composite ABS material is prepared from the following raw materials in parts by weight: 60 parts of ABS resin, 5-15 parts of MBS resin, 10-20 parts of PMMA resin, 3-10 parts of modified nano SiO2 and 5-15 parts of a flame retardant. The modified nano SiO2 is KH570 modified SiO2, and the modified nano SiO2 is KH570 modified SiO2; the flame retardant is a halogen-free flame retardant and is more environment-friendly; the obtained composite ABS material has excellent scratch resistance and flame retardance, meets the requirements of the lead-acid storage battery shell, and can be applied to the lead-acid storage battery shell.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a composite ABS material for a lead-acid battery shell. Background Art

[0002] As a mature and widely used energy storage device, lead-acid batteries occupy an important position in the fields of automobiles, electric bicycles, uninterruptible power supplies (UPS), etc. Its shell material not only needs to have good mechanical properties (such as strength and toughness), but also needs to meet special requirements such as scratch resistance and flame retardancy. Traditional lead-acid battery shells mostly use ABS (acrylonitrile-butadiene-styrene copolymer) material because of its good comprehensive performance, easy processing and cost advantages. However, with the diversification of application scenarios and the improvement of user requirements for product performance, the limitations of traditional ABS materials in scratch resistance and flame retardancy have gradually emerged.

[0003] First of all, insufficient scratch resistance is one of the main problems of traditional ABS materials. During the use and transportation of lead-acid batteries, the surface of the shell is easily subjected to external forces such as friction and scratching, resulting in surface damage, affecting the appearance and service life of the product. Although the presence of the rubber phase (butadiene) in the ABS material improves the toughness of the material, it also reduces the surface hardness, making its scratch resistance poor. Although scratch resistance can be improved by surface coating or post-treatment processes, these methods increase production costs and process complexity.

[0004] Secondly, insufficient flame retardancy is another problem that needs to be solved urgently. Lead-acid batteries may generate high temperatures during operation due to overcharging, short circuits, etc., and may even cause fire risks. Traditional ABS materials have poor flame retardancy, and their limiting oxygen index (LOI) is only 18-20%, which cannot meet application scenarios with high safety requirements. Although the flame retardancy can be improved by adding halogen flame retardants, halogen flame retardants will produce toxic gases and smoke when burned, which is harmful to the environment and human health.

[0005] Therefore, developing a composite ABS material with both high scratch resistance and excellent flame retardancy is of great significance for improving the comprehensive performance of lead-acid battery casings, extending their service life, and meeting environmental protection and safety requirements. Summary of the invention

[0006] The object of the present invention is to provide a composite ABS material for a lead-acid battery shell to solve the problem of insufficient scratch resistance and flame retardancy of the lead-acid battery.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A composite ABS material for a lead-acid battery shell comprises the following raw materials in parts by weight:

[0009] ABS resin: 60 parts,

[0010] MBS resin: 5 - 15 parts,

[0011] PMMA resin: 10 - 20 parts,

[0012] Modified nano - SiO 2 : 3 - 10 parts,

[0013] Flame retardant: 5 - 15 parts.

[0014] Furthermore, the weight - average molecular weight of the ABS resin is 140,000 - 160,000, the butadiene content is 5 - 30%, the acrylonitrile content is 20 - 30%, the styrene content is 40 - 70%, and the melt index under the conditions of 200°C / 1.2 kg is 10 - 15 g / min.

[0015] Furthermore, the weight - average molecular weight of the MBS resin is 100,000 - 150,000, the butadiene content is 30 - 60%, the methyl methacrylate content is 20 - 40%, and the styrene content is 20 - 40%.

[0016] Furthermore, the weight - average molecular weight of the PMMA resin is 50,000 - 150,000, the content of methyl methacrylate > 90%, and the melt index under the conditions of 230°C / 3.8 kg is 1.5 - 3.0 g / min.

[0017] Furthermore, the modified nano - SiO 2 is SiO modified by KH570 2 .

[0018] Furthermore, the flame retardant is one of the halogen - free flame retardants aluminum diethylphosphinate ADP, ammonium polyphosphate APP, and triphenyl phosphate TPP.

[0019] Furthermore, a composite ABS material for a lead - acid battery case can be prepared by the following steps:

[0020] S1. Prepare modified nano - SiO 2 :

[0021] Disperse nano - SiO 2 powder in KH570 solution, continuously react at a constant temperature of 70°C for 3 - 5 h, after the reaction, let it stand for layering, collect the precipitate, wash it 3 - 5 times by centrifugation with absolute ethanol to remove unreacted reagents, and then place it in a vacuum drying oven at 60 - 70°C for drying for 12 hours to obtain modified nano - SiO 2 ;

[0022] S2. Prepare the premix:

[0023] Weigh ABS resin, MBS resin, PMMA resin, and modified nano-SiO 2 and a halogen-free flame retardant proportionally, and place them in a high-speed mixing device for dry premixing treatment to ensure uniform dispersion of each component and obtain a premix;

[0024] S3. Melting, blending, and pelletizing:

[0025] Put the premix into a twin-screw extruder, and prepare composite masterbatch through melting blending, shear dispersion, and extrusion molding processes. Finally, obtain composite ABS material through water-cooled pelletizing.

[0026] Furthermore, the KH570 solution in step S1 is obtained by mixing deionized water, absolute ethanol, and KH570 in a volume ratio of 2:95:3;

[0027] The dosage ratio of nano-SiO 2 powder and KH570 solution is 2g:15 - 20mL.

[0028] Furthermore, the high-speed mixing device in step S2 is a high-speed mixer, the rotation speed of the high-speed mixer is 300 - 500r / min, and the mixing time is 30 - 60min.

[0029] Furthermore, the controlled extrusion temperature of the twin-screw extruder in step S3 is 190 - 230°C, the screw rotation speed is 200 - 400rpm, and the pressure is 3 - 4MPa.

[0030] Advantages of the present invention:

[0031] (1) The composite ABS material prepared by the present invention has excellent scratch resistance and flame retardancy, meets the requirements of the lead-acid battery shell, and can be applied to the lead-acid battery shell; moreover, the flame retardant used in the present invention is a halogen-free flame retardant, which is more environmentally friendly.

[0032] (2) When preparing the composite ABS material of the present invention, adding MBS resin and modified nano-SiO 2 , can improve the compatibility of the system, so that each component can play a better role, and further improve the scratch resistance and flame retardancy of the composite ABS material; the reason is that adding PMMA resin and MBS resin, PMMA resin can improve the scratch resistance of the composite ABS material, while MBS resin can improve the compatibility between PMMA resin and ABS resin, and can better improve the scratch resistance of the composite ABS resin, and MBS resin is beneficial to maintaining the mechanical properties of the composite ABS material; adding modified nano-SiO 2 modified by KH570 can improve nano-SiO 2Compatibility with ABS resin, improving the scratch resistance of the composite ABS material, and modified nano-SiO 2 It can synergistically act with the halogen-free flame retardant to jointly improve the flame retardancy of the composite ABS material. Detailed implementation mode

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] This embodiment provides a composite ABS material for a lead-acid battery case, including the following raw materials in parts by weight:

[0036] ABS resin: 60 parts,

[0037] MBS resin: 5 parts,

[0038] PMMA resin: 10 parts,

[0039] Modified nano-SiO 2 : 3 parts,

[0040] Flame retardant: 5 parts.

[0041] Among them, the weight-average molecular weight of the ABS resin is 150,000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index under the conditions of 200 °C / 1.2 kg is 12 g / min.

[0042] Among them, the weight-average molecular weight of the MBS resin is 120,000, the butadiene content is 40%, the methyl methacrylate content is 30%, and the styrene content is 30%.

[0043] Among them, the weight-average molecular weight of the PMMA resin is 100,000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0044] It is prepared by the following steps:

[0045] S1. Prepare modified nano-SiO 2 :

[0046] Take 10 g of nano-SiO 2The powder was dispersed in 80 mL of KH570 solution obtained by mixing deionized water, absolute ethanol and KH570 in a volume ratio of 2:95:3, and the reaction was continuously carried out for 4 h under the condition of constant temperature at 70 °C. After the reaction, it was allowed to stand for layering, and the precipitate was collected. It was centrifugally washed 5 times with absolute ethanol to remove unreacted reagents, and then placed in a vacuum drying oven at 60 °C for drying for 12 hours to obtain modified nano-SiO 2 ;

[0047] S2. Preparation of premix:

[0048] Weigh ABS resin, MBS resin, PMMA resin, modified nano-SiO 2 and halogen-free flame retardant in proportion, and place them in a high-speed mixer for dry premixing treatment to ensure uniform dispersion of each component and obtain a premix; the rotation speed of the high-speed mixer is 500 r / min, and the mixing time is 60 min;

[0049] S3. Melt blending and pelletizing:

[0050] Put the premix into a twin-screw extruder. The controlled extrusion temperature of the twin-screw extruder is 210 °C, the screw speed is 300 rpm, and the pressure is 3.5 MPa. Composite masterbatch is prepared by melt blending, shear dispersion and extrusion molding processes, and finally composite ABS material is obtained by water-cooled pelletizing.

[0051] Example 2

[0052] This example provides a composite ABS material for lead-acid battery shells, including the following raw materials in parts by weight:

[0053] ABS resin: 60 parts,

[0054] MBS resin: 10 parts,

[0055] PMMA resin: 15 parts,

[0056] Modified nano-SiO 2 : 3 parts,

[0057] Flame retardant: 5 parts.

[0058] Among them, the weight-average molecular weight of the ABS resin is 150,000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index at 200 °C / 1.2 kg is 12 g / min.

[0059] Among them, the weight-average molecular weight of the MBS resin is 120,000, the butadiene content is 40%, the methyl methacrylate content is 30%, and the styrene content is 30%.

[0060] Among them, the weight-average molecular weight of the PMMA resin is 100,000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0061] It is prepared through the following steps:

[0062] S1. Prepare modified nano-SiO 2 :

[0063] Disperse 10 g of nano-SiO 2 powder in 80 mL of KH570 solution obtained by mixing deionized water, anhydrous ethanol and KH570 in a volume ratio of 2:95:3, continuously react at a constant temperature of 70 °C for 4 h, after the reaction ends, let it stand for layering, collect the precipitate, wash it 5 times by centrifugation with anhydrous ethanol to remove unreacted reagents, and then place it in a vacuum drying oven at 60 °C for drying for 12 hours to obtain modified nano-SiO 2 ;

[0064] S2. Prepare the premix:

[0065] Weigh ABS resin, MBS resin, PMMA resin, modified nano-SiO 2 and the halogen-free flame retardant in proportion, and place them in a high-speed mixer for dry premixing treatment to ensure that each component is evenly dispersed to obtain the premix; the rotation speed of the high-speed mixer is 500 r / min, and the mixing time is 60 min;

[0066] S3. Melt blending and pelletizing:

[0067] Put the premix into a twin-screw extruder. The controlled extrusion temperature of the twin-screw extruder is 210 °C, the screw speed is 300 rpm, and the pressure is 3.5 MPa. Prepare the composite masterbatch through melt blending, shear dispersion and extrusion molding processes, and finally obtain the composite ABS material through water-cooled pelletizing.

[0068] Example 3

[0069] This example provides a composite ABS material for a lead-acid battery case, which includes the following raw materials in parts by weight:

[0070] ABS resin: 60 parts,

[0071] MBS resin: 15 parts,

[0072] PMMA resin: 20 parts,

[0073] Modified nano-SiO 2 : 3 parts,

[0074] Flame retardant: 5 parts.

[0075] Among them, the weight-average molecular weight of the ABS resin is 150,000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index under the conditions of 200 °C / 1.2 kg is 12 g / min.

[0076] Among them, the weight-average molecular weight of the MBS resin is 120,000, the butadiene content is 40%, the methyl methacrylate content is 30%, and the styrene content is 30%.

[0077] Among them, the weight-average molecular weight of the PMMA resin is 100,000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0078] It is prepared by the following steps:

[0079] S1. Prepare modified nano-SiO₂: 2 :

[0080] Disperse 10 g of nano-SiO₂ powder in 80 mL of a KH570 solution obtained by mixing deionized water, absolute ethanol, and KH570 in a volume ratio of 2:95:3, and continuously react at a constant temperature of 70 °C for 4 h. After the reaction is completed, let it stand for stratification, collect the precipitate, wash it 5 times by centrifugation with absolute ethanol to remove unreacted reagents, and then place it in a vacuum drying oven at 60 °C for drying for 12 hours to obtain modified nano-SiO₂; 2 2 ;

[0081] S2. Prepare the premix:

[0082] Weigh the ABS resin, MBS resin, PMMA resin, modified nano-SiO₂ and the halogen-free flame retardant in proportion, place them in a high-speed mixer for dry premixing treatment to ensure uniform dispersion of each component, and obtain the premix; the rotation speed of the high-speed mixer is 500 r / min, and the mixing time is 60 min; 2

[0083] S3. Melt blending and pelletizing:

[0084] Put the premix into a twin-screw extruder. The controlled extrusion temperature of the twin-screw extruder is 210 °C, the screw speed is 300 rpm, and the pressure is 3.5 MPa. Prepare the composite masterbatch through melt blending, shear dispersion, and extrusion molding processes, and finally obtain the composite ABS material through water-cooled pelletizing.

[0085] Example 4

[0086] This example provides a composite ABS material for a lead-acid battery case, including the following raw materials in parts by weight:

[0087] ABS resin: 60 parts

[0088] MBS resin: 15 parts

[0089] PMMA resin: 20 parts

[0090] Modified nano-SiO 2 : 6 parts

[0091] Flame retardant: 10 parts

[0092] Among them, the weight-average molecular weight of the ABS resin is 150,000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index under the conditions of 200 °C / 1.2 kg is 12 g / min.

[0093] Among them, the weight-average molecular weight of the MBS resin is 120,000, the butadiene content is 40%, the methyl methacrylate content is 30%, and the styrene content is 30%.

[0094] Among them, the weight-average molecular weight of the PMMA resin is 100,000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0095] It is prepared through the following steps:

[0096] S1. Prepare modified nano-SiO 2 :

[0097] Disperse 10 g of nano-SiO 2 powder in 80 mL of KH570 solution obtained by mixing deionized water, absolute ethanol and KH570 in a volume ratio of 2:95:3, continuously react at a constant temperature of 70 °C for 4 h, after the reaction ends, let it stand for layering, collect the precipitate, wash it 5 times by centrifugation with absolute ethanol to remove unreacted reagents, and then place it in a vacuum drying oven at 60 °C for drying for 12 hours to obtain modified nano-SiO 2 ;

[0098] S2. Prepare the premix:

[0099] Weigh the ABS resin, MBS resin, PMMA resin, modified nano-SiO 2 and the halogen-free flame retardant according to the proportion, place them in a high-speed mixer for dry premixing treatment to ensure that each component is evenly dispersed to obtain the premix; the rotation speed of the high-speed mixer is 500 r / min, and the mixing time is 60 min;

[0100] S3. Melt blending and pelletizing:

[0101] Put the premix into a twin-screw extruder. The controlled extrusion temperature of the twin-screw extruder is 210 °C, the screw speed is 300 rpm, and the pressure is 3.5 MPa. Prepare the composite masterbatch through the processes of melt blending, shear dispersion, and extrusion molding, and finally obtain the composite ABS material through water-cooled pelletizing.

[0102] Example 5

[0103] This example provides a composite ABS material for a lead-acid battery case, which includes the following raw materials in parts by weight:

[0104] ABS resin: 60 parts,

[0105] MBS resin: 15 parts,

[0106] PMMA resin: 20 parts,

[0107] Modified nano-SiO 2 : 10 parts,

[0108] Flame retardant: 15 parts.

[0109] Among them, the weight-average molecular weight of the ABS resin is 150,000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index under the conditions of 200 °C / 1.2 kg is 12 g / min.

[0110] Among them, the weight-average molecular weight of the MBS resin is 120,000, the butadiene content is 40%, the methyl methacrylate content is 30%, and the styrene content is 30%.

[0111] Among them, the weight-average molecular weight of the PMMA resin is 100,000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0112] It is prepared through the following steps:

[0113] S1. Prepare modified nano-SiO 2 :

[0114] Disperse 10 g of nano-SiO 2 powder in 80 mL of KH570 solution obtained by mixing deionized water, absolute ethanol, and KH570 in a volume ratio of 2:95:3. Continuously react at a constant temperature of 70 °C for 4 h. After the reaction ends, let it stand for stratification, collect the precipitate, wash it 5 times by centrifugation with absolute ethanol to remove unreacted reagents, and then place it in a vacuum drying oven at 60 °C for 12 hours to obtain modified nano-SiO 2 ;

[0115] S2. Prepare the premix:

[0116] Weigh ABS resin, MBS resin, PMMA resin, and halogen-free flame retardant proportionally, and place them in a high-speed mixer for dry premixing treatment to ensure uniform dispersion of each component and obtain a premix; the rotation speed of the high-speed mixer is 500 r / min, and the mixing time is 60 min; 2 S3, Melting Blending and Pelletizing:

[0117] Put the premix into a twin-screw extruder. The controlled extrusion temperature of the twin-screw extruder is 210 °C, the screw rotation speed is 300 rpm, and the pressure is 3.5 MPa. Prepare composite masterbatch through melting blending, shear dispersion, and extrusion molding processes, and finally obtain composite ABS material through water-cooled pelletizing.

[0118]

[0119] Comparative Example 1

[0120] This comparative example provides a composite ABS material for lead-acid battery casings, including the following raw materials in parts by weight:

[0121] ABS resin: 60 parts,

[0122] PMMA resin: 10 parts,

[0123] Modified nano-SiO 2 : 3 parts,

[0124] Flame retardant: 5 parts.

[0125] Among them, the weight-average molecular weight of the ABS resin is 150,000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index under the conditions of 200 °C / 1.2 kg is 12 g / min.

[0126] Among them, the weight-average molecular weight of the PMMA resin is 100,000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0127] It is prepared through the following steps:

[0128] S1. Prepare modified nano-SiO 2 :

[0129] Disperse 10 g of nano-SiO 2 powder in 80 mL of KH570 solution obtained by mixing deionized water, absolute ethanol, and KH570 in a volume ratio of 2:95:3. React continuously at a constant temperature of 70 °C for 4 h. After the reaction ends, let it stand for stratification, collect the precipitate, wash it 5 times by centrifugation with absolute ethanol to remove unreacted reagents, and then place it in a vacuum drying oven at 60 °C for drying for 12 hours to obtain modified nano-SiO 2 ;​

[0130] S2. Prepare the premix:

[0131] Weigh ABS resin, PMMA resin, modified nano - SiO 2 and the halogen - free flame retardant in proportion, and place them in a high - speed mixer for dry premixing treatment to ensure that each component is evenly dispersed, thus obtaining the premix; the rotation speed of the high - speed mixer is 500 r / min, and the mixing time is 60 min.

[0132] S3. Melt - blending and pelletizing:

[0133] Put the premix into a twin - screw extruder. The controlled extrusion temperature of the twin - screw extruder is 210 °C, the screw speed is 300 rpm, and the pressure is 3.5 MPa. Prepare the composite masterbatch through melt - blending, shear dispersion and extrusion molding processes, and finally obtain the composite ABS material through water - cooling pelletizing.

[0134] Comparative Example 2

[0135] This example provides a composite ABS material for the shell of a lead - acid battery, which includes the following raw materials in parts by weight:

[0136] ABS resin: 60 parts,

[0137] MBS resin: 5 parts,

[0138] PMMA resin: 10 parts,

[0139] Nano - SiO 2 : 3 parts,

[0140] Flame retardant: 5 parts.

[0141] Among them, the weight - average molecular weight of the ABS resin is 150000, the butadiene content is 20%, the acrylonitrile content is 30%, the styrene content is 50%, and the melt index under the conditions of 200 °C / 1.2 kg is 12 g / min.

[0142] Among them, the weight - average molecular weight of the MBS resin is 120000, the butadiene content is 40%, the methyl methacrylate content is 30%, and the styrene content is 30%.

[0143] Among them, the weight - average molecular weight of the PMMA resin is 100000, the content of methyl methacrylate is 95%, and the melt index under the conditions of 230 °C / 3.8 kg is 2.0 g / min.

[0144] It is prepared through the following steps:

[0145] S1. Prepare the premix:

[0146] Weigh ABS resin, MBS resin, PMMA resin, and nano-SiO 2 and halogen-free flame retardant proportionally, and place them in a high-speed mixer for dry premixing treatment to ensure uniform dispersion of each component and obtain a premix; the rotation speed of the high-speed mixer is 500 r / min, and the mixing time is 60 min;

[0147] S2. Melting blending and pelletizing:

[0148] Put the premix into a twin-screw extruder. The controlled extrusion temperature of the twin-screw extruder is 210 °C, the screw rotation speed is 300 rpm, and the pressure is 3.5 MPa. Prepare composite masterbatch through melting blending, shear dispersion, and extrusion molding processes, and finally obtain composite ABS material through water-cooled pelletizing.

[0149] Test the scratch resistance and flame retardancy of the composite ABS materials obtained in Examples 1 - 5 and Comparative Examples 1 - 2; among them, the scratch resistance test method is to evaluate the scratch degree with a scratch tester: use a mechanically driven scraper to scrape a segmented pattern on the surface of the test sample, and each scraper only scrapes once in one direction, and then use a colorimeter to measure the color deviation △E compared with the unscratched surface; the flame retardancy is tested by vertical burning test (UL-94) on the sample according to the national standard GB / T 2408-2021; the results are shown in Table 1:

[0150] Table 1

[0151] Project Color difference △E after scratching Flame retardant grade Example 1 0.38 V-1 Example 2 0.36 V-1 Example 3 0.34 V-1 Example 4 0.30 V-0 Example 5 0.26 V-0 Comparative example 1 0.52 V-2 Comparative example 2 0.54 V-2

[0152] As can be seen from Table 1, the composite ABS materials obtained in Examples 1 - 5 have excellent scratch resistance and a relatively high flame retardancy grade, indicating good flame retardancy.

[0153] Compared with Example 1, in Comparative Example 1, MBS resin was not added, and the scratch resistance of the obtained composite ABS material became worse and the flame retardancy grade became lower; the reason is that PMMA resin can improve the scratch resistance of the composite ABS material, and at the same time MBS resin can improve the compatibility between PMMA resin and ABS resin. After lacking MBS resin, the compatibility of the system becomes worse, so the scratch resistance and flame retardancy of the obtained composite ABS material become worse.

[0154] Compared with Example 1, in Comparative Example 2, nano-SiO 2 was not modified, and the scratch resistance of the obtained composite ABS material became worse and the flame retardancy grade became lower. The reason is that adding modified nano-SiO 2 modified with KH570 can improve the compatibility between nano-SiO 2 and ABS resin, improve the scratch resistance of the composite ABS material, and the modified nano-SiO 2It can synergistically act with the halogen-free flame retardant to jointly improve the flame retardancy of the composite ABS material.

[0155] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0156] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite ABS material for lead-acid battery casing, characterized in that: The invention comprises the following raw materials in parts by weight: ABS resin: 60 parts, MBS resin: 5-15 parts, PMMA resin: 10-20 parts, Modified nano-SiO2: 3-10 parts, Flame retardant: 5-15 parts.

2. The composite ABS material for lead-acid battery casing according to claim 1, characterized in that: The ABS resin has a weight average molecular weight of 140,000-160,000, a butadiene content of 5-30%, an acrylonitrile content of 20-30%, a styrene content of 40-70%, and a melt index of 10-15 g / min at 200° C. / 1.2 kg.

3. The composite ABS material for lead-acid battery casing according to claim 1, characterized in that: The MBS resin has a weight average molecular weight of 100,000-150,000, a butadiene content of 30-60%, a methyl methacrylate content of 20-40%, and a styrene content of 20-40%.

4. The composite ABS material for lead-acid battery casing according to claim 1, characterized in that: The weight average molecular weight of the PMMA resin is 50,000-150,000, the content of methyl methacrylate is greater than 90%, and the melting index under the conditions of 230° C. / 3.8 kg is 1.5-3.0 g / min.

5. The composite ABS material for lead-acid battery casing according to claim 1, characterized in that: The modified nano-SiO2 is SiO2 modified by KH570.

6. The composite ABS material for lead-acid battery casing according to claim 1, characterized in that: The flame retardant is one of the halogen-free flame retardants diethyl aluminum hypophosphite ADP, ammonium polyphosphate APP, and triphenyl phosphate TPP.

7. The composite ABS material for lead-acid battery casing according to claim 1, characterized in that: It can be prepared by the following steps: S1. Preparation of modified nano-SiO2: The nano-SiO2 powder was dispersed in KH570 solution, and the reaction was continued at a constant temperature of 70°C for 3-5 hours. After the reaction was completed, the precipitate was allowed to stand for stratification, and the precipitate was collected and washed by centrifugation with anhydrous ethanol for 3-5 times to remove the unreacted reagent, and then placed in a vacuum drying oven at 60-70°C for 12 hours to obtain modified nano-SiO2; S2. Preparation of premix: ABS resin, MBS resin, PMMA resin, modified nano-SiO2 and halogen-free flame retardant are weighed in proportion, and placed in a high-speed mixing device for dry premixing to ensure that each component is evenly dispersed to obtain a premix; S3. Melt blending and granulation: The premix is ​​put into a twin-screw extruder, and the composite masterbatch is prepared through melt blending, shear dispersion and extrusion molding processes, and finally the composite ABS material is obtained through water-cooling pelletizing.

8. The composite ABS material for lead-acid battery casing according to claim 7, characterized in that: The KH570 solution in step S1 is obtained by mixing deionized water, anhydrous ethanol and KH570 in a volume ratio of 2:95:3; The dosage ratio of nano-SiO2 powder and KH570 solution is 2g:15-20mL.

9. The composite ABS material for lead-acid battery casing according to claim 7, characterized in that: The high-speed mixing device in step S2 is a high-speed mixer, the rotation speed of the high-speed mixer is 300-500r / min, and the mixing time is 30-60min.

10. The composite ABS material for lead-acid battery casing according to claim 7, characterized in that: In step S3, the twin-screw extruder is controlled to have an extrusion temperature of 190-230° C., a screw speed of 200-400 rpm, and a pressure of 3-4 MPa.