Plastic shell material for high-strength anti-deformation battery and preparation method of plastic shell material

Abstract

The invention discloses a plastic shell material for a high-strength anti-deformation battery and a preparation method of the plastic shell material, and relates to the technical field of high polymer materials. The invention relates to a high-strength deformation-resistant plastic shell material for a battery, which comprises the following components in parts by weight: 14-18 parts of ABS (Acrylonitrile Butadiene Styrene) plastic particles, 40-50 parts of PP (Polypropylene) plastic particles, 0.1-1 part of lubricating oil, 2-6 parts of boron-based polycarbonate, 8-10 parts of a reinforcing material, 0.1-2 parts of an acid acceptor and 0.1-0.5 part of an antioxidant, the ABS plastic particles are basic ABS plastic particles and modified ABS plastic particles in a mass ratio of 1: 1; the reinforcing material comprises glass fibers and vermiculite in a mass ratio of (3-4): (5-6); the acid acceptor is prepared from 2-methylimidazole zinc salt and nano magnesium oxide in a mass ratio of 3: 2; the antioxidants comprise 1010 and 168 in a mass ratio of 1: 1. The prepared plastic shell material is stable in performance and has the advantages of being safe, reliable, high in strength and excellent in deformation resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a high-strength, deformation-resistant plastic shell material for batteries and a preparation method thereof. Background Art

[0002] The battery industry is rapidly developing, and battery applications are expanding, extending from traditional consumer electronics to areas with more stringent battery performance requirements, such as electric vehicles and energy storage systems. Battery plastic casings are key components that protect internal components and ensure safe and stable operation. Their performance directly impacts the overall performance, safety, and lifespan of the battery.

[0003] At present, the common battery plastic shell materials on the market have many deficiencies in mechanical strength and anti-deformation performance: First, conventional battery plastic shell materials have weak mechanical strength and are prone to cracking and deformation due to collisions during transportation or dropping during use; second, conventional battery plastic shell materials will soften and deform under different environments, becoming brittle and easy to crack, and are difficult to adapt to the use requirements of different environments; third, conventional battery plastic shell materials have poor compatibility, and the poor compatibility between the reinforcing material and the matrix resin makes it impossible to fully exert the role of the reinforcing material, limiting the overall performance improvement of the material.

[0004] In summary, developing a high-strength, deformation-resistant battery plastic shell material to overcome the defects of existing battery plastic shell materials and improve the safety and reliability of batteries in complex usage scenarios is of great significance to the safe and sustainable development of the battery industry. Summary of the Invention

[0005] The object of the present invention is to provide a high-strength, deformation-resistant plastic shell material for batteries and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A high-strength, deformation-resistant plastic shell material for a battery. The raw materials of the plastic shell material include the following components: by weight, 14 to 18 parts of ABS plastic particles, 40 to 50 parts of PP plastic particles, 0.1 to 1 part of lubricating oil, 2 to 6 parts of boron-based polycarbonate, 8 to 10 parts of reinforcing material, 0.1 to 2 parts of acid absorber, and 0.1 to 0.5 parts of antioxidant.

[0007] More optimally, the method for preparing the boron-based polycarbonate comprises the following steps: S1-1: Propylene oxide, allyl glycidyl ether, and zinc glutarate were mixed, and CO2 was introduced to increase the pressure to 4.8-6.2 MPa; the temperature was set at 58-62°C, and the reaction was stirred for 38-40 hours to obtain a polymer; S1-2: Add the polymer to dichloromethane, add 94-97% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add benzene-1,4-diboronic acid and 1-thioglycerol to tetrahydrofuran, set the temperature to 24-27°C, stir, add anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: CO2 polycarbonate, mercapto borate and benzoin dimethyl ether are sequentially added to tetrahydrofuran, and stirred to react at room temperature under ultraviolet light to obtain boron-based polycarbonate.

[0008] Among them, boron-based polycarbonate is a cross-linked network formed by introducing mercapto borate and CO2-based polycarbonate through a mercapto-ene click reaction. It has excellent mechanical properties, gives the material self-healing and recyclability, and has environmentally friendly characteristics.

[0009] More optimally, in the raw materials of the polymer, the mass ratio of propylene oxide, allyl glycidyl ether and zinc glutarate is (34.5~34.9):(17.2~17.5):1; in the raw materials of the mercapto borate, the mass ratio of benzene-1,4-diboric acid and 1-thioglycerol is (0.8~1.1):(0.9~1.2); in the raw materials of the boron-based polycarbonate, the mass ratio of CO2 polycarbonate, mercapto borate and benzoin dimethyl ether is (35.4~35.6):(3.4~3.6):1.

[0010] More optimally, the reinforcing material is composed of glass fiber and vermiculite, with a mass ratio of (3~4): (5~6); the acid absorber is composed of 2-methylimidazole zinc salt and nano-magnesium oxide, with a mass ratio of 3:2; the antioxidant is composed of 1010 and 168, with a mass ratio of 1:1.

[0011] Among them, glass fiber is an inorganic non-metallic material with silicon dioxide as the main component, which has high strength, good insulation and thermal stability; vermiculite is a layered hydrated aluminosilicate mineral, which forms a porous lightweight material after high-temperature expansion and has thermal insulation and heat-insulating properties; the linear reinforcement of glass fiber and the layered particles of vermiculite constitute a point-line complementary structure, which synergistically enhances the thermal stability and mechanical strength of the plastic shell material.

[0012] More optimally, the ABS plastic particles include one or both of basic ABS plastic and modified ABS plastic.

[0013] Among them, ABS plastic is a ternary copolymer of three monomers: acrylonitrile (A), butadiene (B) and styrene (S). It combines the properties of the three components, has a certain surface hardness, elasticity and toughness, and has good comprehensive performance; the modified ABS plastic introduces vinyl and borate groups. The vinyl group can react with the styrene in the basic ABS plastic, significantly improving the compatibility of the components. The borate bond reacts with the polar groups of the basic ABS plastic, and at the same time has better mechanical strength, reducing the probability of deformation and cracking of the plastic shell during use.

[0014] More optimally, the ABS plastic particles are composed of basic ABS plastic and modified ABS plastic, and the mass ratio of the two is 1:1.

[0015] More optimally, the method for preparing the modified ABS plastic particles comprises the following steps: S1-1: Mix basic ABS plastic, 1,3-propylene glycol 2-vinylphenylboronic acid ester, stearic acid, and nano magnesium hydroxide, set the temperature to 24-27° C., and rotate and mix for 7-9 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0016] More optimally, the mixture raw materials include, by weight: 30-32 parts of basic ABS plastic, 8-10 parts of nano magnesium hydroxide, 3-5 parts of 2-vinylphenylboronic acid 1,3-propylene glycol ester, 1-2 parts of stearic acid, and 0.1-0.3 parts of dibenzoyl peroxide; the rotation speed is 1100-1300 rpm; and the extrusion temperature is 180-200°C.

[0017] A method for preparing a high-strength, deformation-resistant plastic shell material for a battery comprises the following steps: S1-1: Stirring and mixing ABS plastic particles and PP plastic particles to obtain a mixed material; S1-2: Boron-based polycarbonate, reinforcing material, acid absorber, antioxidant and lubricating oil are added to the mixture in sequence, mixed evenly, and sealed for plasticization. After molding, the mixture is cooled and shaped, and burrs are trimmed to obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0018] More optimally, during the closed plasticizing process, the temperature is 190-210°C; during the cooling and shaping process, the temperature is 20-35°C.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are: by adjusting the reinforcing material, using glass fiber and vermiculite as reinforcing materials, and introducing boron-based polycarbonate, the present invention effectively improves the thermal stability and mechanical strength of the plastic shell material for the battery and thereby increases its anti-deformation ability.

[0020] In terms of mechanical strength optimization, the composite system of glass fiber and vermiculite is combined with the interface modification effect of boron-based polycarbonate to construct a strengthening mechanism of "rigid support-stress dispersion-interface compatibility". As a high-strength inorganic filler, the tensile strength and elastic modulus of glass fiber can significantly improve the rigidity of the plastic shell material and inhibit the deformation of the plastic shell material under mechanical stress; vermiculite has a porous layered structure, and its density increases after expansion and is filled in ABS plastic and PP plastic. It disperses stress through the "ball effect", and the air layers between the layers can block the transfer of heat, reduce the thermal damage to the plastic shell material caused by battery heating, and meet the use of the plastic shell material in various environments; the molecular chain of boron-based polycarbonate contains double bonds (-C=C-) and thiol groups (-SH), and a three-dimensional cross-linked network (-SC- bond) is formed through the thiol-ene click reaction triggered by ultraviolet light, which wraps and bonds the glass fiber and vermiculite, allowing the dispersed phase filler to synergistically bear stress, thereby improving the plastic shell material. The mechanical strength of the shell material is excellent, and it has good compatibility with 1,3-propylene glycol 2-vinylphenylboronic acid ester in modified ABS plastics. The main chain polycarbonate structure (-O-CO-O-) of boron-based polycarbonate has good physical compatibility with the styrene segments in basic ABS plastics and the hydrocarbon segments of PP plastic particles. The flexible ester bonds (-COO-) and alkyl chains of its side chains can interact with the non-polar regions of ABS plastic particles and PP plastic particles through van der Waals forces to reduce phase separation, thereby achieving the triple effects of high-strength load-bearing of glass fiber, stress buffering of vermiculite and dynamic cross-linking of polymer networks, significantly improving the bending strength of the material, reducing the risk of brittle fracture, and giving the plastic shell material beneficial deformation resistance.

[0021] Vermiculite, as an inorganic filler, effectively isolates heat transfer with its unique porous layered structure, reducing damage to the plastic shell material caused by high temperatures. Boron-based polycarbonate, through a UV-induced thiol-ene click reaction, forms a three-dimensional crosslinked network (-SC- bonds), which restricts the thermal motion of polymer segments and maintains structural stability, inhibiting material decomposition. Furthermore, at high temperatures, borate ester bonds (-BO-) can capture combustion-active free radicals and inhibit combustion. The boron-based polycarbonate backbone polycarbonate and the inert gases released by vermiculite synergize to form an intumescent carbonized layer, effectively blocking oxygen penetration and enhancing the flame retardancy of the plastic shell material. Furthermore, the borate ester bonds work synergistically with the porous structure of vermiculite to enhance the thermal stability of the plastic shell material, enabling it to adapt to the frequent temperature changes during battery charging and discharging, meeting the requirements of long-term use in high-temperature environments.

[0022] Boron-based polycarbonate boasts a superior polymer segment structure and interfacial chemical bonding. Furthermore, its synergistic combination with glass fiber and vermiculite produces superior mechanical strength and promotes compatibility with plastic shell materials. The high strength of the glass fiber and the mechanical support of the mercaptoborate crosslinking network enhance the mechanical strength of the plastic shell material. The porous buffering of the vermiculite and the energy dissipation of the borate bonds increase the tensile strength of the plastic shell material and reduce brittle fracture. Through the triple mechanism of "inorganic filler rigidity enhancement, mineral porous buffering, and polymer dynamic crosslinking," these three elements achieve a synergistic improvement in mechanical strength and deformation resistance.

[0023] In summary, the present invention successfully overcomes key problems such as insufficient strength of traditional battery plastic shell materials and weak compatibility of plastic materials through innovative formula design and synergistic modification strategies, and prepares a battery plastic shell material that integrates high strength and anti-deformation functions, achieving further improvement in mechanical properties and functional characteristics, and has significant industrial application prospects. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that, in parts by weight, the purchase manufacturers of all raw materials involved in the present invention include without any special restrictions: in the following embodiments, ABS plastic particles (the main component is acrylonitrile-butadiene-styrene resin, Yangzhou Haida Plastic Technology Co., Ltd.), PP plastic particles (the main component is polypropylene, Zhongsu High-Tech (Huaian) Co., Ltd.), lubricating oil (the main component is mineral oil, Xuyi Zhongxuan Electrical Hardware Co., Ltd.), propylene oxide (CAS: 75-56-9), allyl glycidyl ether (CAS: 106-92-3), zinc glutarate (analytical grade, Shanghai Anaiji Chemical Co., Ltd.), dichloromethane (CAS: 75-09-2), benzene-1,4-dichloroethane (CAS: 75-09-2), Boric acid (CAS: 4612-26-4), 1-thioglycerol (CAS: 96-27-5), tetrahydrofuran (CAS: 109-99-9), anhydrous magnesium sulfate (CAS: 7487-88-9), n-hexane (CAS: 110-54-3), dimethyl benzoate (CAS: 24650-42-8), 1,3-propylene glycol 2-vinylphenylboronate (CAS: 850567-61-2), stearic acid (CAS: 57-11-4), 2-methylimidazole zinc salt (CAS: 59061-53-9), nano-magnesium hydroxide (30 nm mesh), glass fiber (2 mm), vermiculite (600 mesh), nano-magnesium oxide (500 nm mesh).

[0026] Example 1: A high-strength, deformation-resistant plastic shell material for a battery, comprising the following steps: 1. Pre-preparation of boron-based polycarbonate: S1-1: 17.5 parts of propylene oxide, 8.7 parts of allyl glycidyl ether, and 0.5 parts of zinc glutarate were mixed, CO2 was introduced and the pressure was increased to 5.2 MPa; the temperature was set to 60°C, and the reaction was stirred for 40 hours to obtain a polymer; S1-2: Add the polymer to 35 mL of dichloromethane, add 95% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add 1 part of benzene-1,4-diboronic acid and 1.2 parts of 1-thioglycerol to tetrahydrofuran, set the temperature to 25°C, stir, add 2.8 g of anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: 17.8 parts of CO2 polycarbonate, 1.7 parts of mercapto borate and 0.2 parts of benzoin dimethyl ether were added to 25 mL of tetrahydrofuran in sequence, and stirred for reaction at room temperature under ultraviolet light for 2 hours to obtain boron-based polycarbonate.

[0027] 2. Preparation of modified ABS plastic: S1-1: 31 parts of basic ABS plastic, 4 parts of 1,3-propylene glycol 2-vinylphenylboronate, 1.5 parts of stearic acid, 9 parts of nano magnesium hydroxide, and 0.2 parts of dibenzoyl peroxide were mixed, the temperature was set at 25° C., and the mixture was rotated and mixed for 8 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0028] 3. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 8 parts of basic ABS plastic and 8 parts of modified ABS plastic are mixed to obtain ABS plastic particles; 16 parts of ABS plastic particles and 45 parts of PP plastic particles are stirred and mixed to obtain a mixed material; S1-2: Add 4 parts of boron-based polycarbonate, 3.5 parts of glass fiber, 5.5 parts of vermiculite, 0.6 parts of 2-methylimidazole zinc salt, 0.4 parts of nano-magnesium oxide, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, and 0.5 parts of lubricating oil to the mixture in sequence, mix evenly, and perform closed plasticization at 200°C. After molding, cool and shape at 30°C, trim burrs, and obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0029] Example 2: A high-strength, deformation-resistant plastic shell material for a battery, comprising the following steps: 1. Pre-preparation of boron-based polycarbonate: S1-1: 17.5 parts of propylene oxide, 8.7 parts of allyl glycidyl ether, and 0.5 parts of zinc glutarate were mixed, CO2 was introduced and the pressure was increased to 5.2 MPa; the temperature was set to 60°C, and the reaction was stirred for 40 hours to obtain a polymer; S1-2: Add the polymer to 35 mL of dichloromethane, add 95% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add 1 part of benzene-1,4-diboronic acid and 1.2 parts of 1-thioglycerol to tetrahydrofuran, set the temperature to 25°C, stir, add 2.8 g of anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: 17.8 parts of CO2 polycarbonate, 1.7 parts of mercapto borate and 0.2 parts of benzoin dimethyl ether were added to 25 mL of tetrahydrofuran in sequence, and stirred for reaction at room temperature under ultraviolet light for 2 hours to obtain boron-based polycarbonate.

[0030] 2. Preparation of modified ABS plastic: S1-1: 30 parts of basic ABS plastic, 3 parts of 1,3-propylene glycol 2-vinylphenylboronic acid ester, 1 part of stearic acid, 8 parts of nano magnesium hydroxide and 0.1 part of dibenzoyl peroxide were mixed, the temperature was set at 25° C., and the mixture was rotated and mixed for 8 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0031] 3. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 7 parts of basic ABS plastic and 7 parts of modified ABS plastic are mixed to obtain ABS plastic particles; 14 parts of ABS plastic particles and 40 parts of PP plastic particles are stirred and mixed to obtain a mixed material; S1-2: Add 2 parts of boron-based polycarbonate, 3 parts of glass fiber, 5 parts of vermiculite, 0.06 parts of 2-methylimidazole zinc salt, 0.04 parts of nano-magnesium oxide, 0.05 parts of antioxidant 1010, 0.05 parts of antioxidant 168, and 0.1 parts of lubricating oil to the mixture in sequence, mix evenly, and perform closed plasticization at 200°C. After molding, cool and shape at 30°C, trim burrs, and obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0032] Example 3: A high-strength, deformation-resistant plastic shell material for a battery, comprising the following steps: 1. Pre-preparation of boron-based polycarbonate: S1-1: 17.5 parts of propylene oxide, 8.7 parts of allyl glycidyl ether, and 0.5 parts of zinc glutarate were mixed, CO2 was introduced and the pressure was increased to 5.2 MPa; the temperature was set to 60°C, and the reaction was stirred for 40 hours to obtain a polymer; S1-2: Add the polymer to 35 mL of dichloromethane, add 95% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add 1 part of benzene-1,4-diboronic acid and 1.2 parts of 1-thioglycerol to tetrahydrofuran, set the temperature to 25°C, stir, add 2.8 g of anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: 17.8 parts of CO2 polycarbonate, 1.7 parts of mercapto borate and 0.2 parts of benzoin dimethyl ether were added to 25 mL of tetrahydrofuran in sequence, and stirred for reaction at room temperature under ultraviolet light for 2 hours to obtain boron-based polycarbonate.

[0033] 2. Preparation of modified ABS plastic: S1-1: 32 parts of basic ABS plastic, 5 parts of 1,3-propylene glycol 2-vinylphenylboronate, 2 parts of stearic acid, 10 parts of nano magnesium hydroxide, and 0.3 parts of dibenzoyl peroxide were mixed, the temperature was set at 25° C., and the mixture was rotated and mixed for 8 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0034] 3. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 9 parts of basic ABS plastic and 9 parts of modified ABS plastic are mixed to obtain ABS plastic particles; 18 parts of ABS plastic particles and 50 parts of PP plastic particles are stirred and mixed to obtain a mixed material; S1-2: Add 6 parts of boron-based polycarbonate, 4 parts of glass fiber, 6 parts of vermiculite, 0.12 parts of 2-methylimidazole zinc salt, 0.8 parts of nano-magnesium oxide, 0.25 parts of antioxidant 1010, 0.25 parts of antioxidant 168, and 1 part of lubricating oil to the mixture in sequence, mix evenly, and perform closed plasticization at 200°C. After molding, cool and shape at 30°C, trim burrs, and obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0035] Comparative Example 1: Based on Example 1, the amount of boron-based polycarbonate added was adjusted to add 0 parts of boron-based polycarbonate, specifically comprising the following steps: 1. Preparation of modified ABS plastic: S1-1: 31 parts of basic ABS plastic, 4 parts of 1,3-propylene glycol 2-vinylphenylboronate, 1.5 parts of stearic acid, 9 parts of nano magnesium hydroxide, and 0.2 parts of dibenzoyl peroxide were mixed, the temperature was set at 25° C., and the mixture was rotated and mixed for 8 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0036] 2. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 8 parts of basic ABS plastic and 8 parts of modified ABS plastic are mixed to obtain ABS plastic particles; 16 parts of ABS plastic particles and 45 parts of PP plastic particles are stirred and mixed to obtain a mixed material; S1-2: 3.5 parts of glass fiber, 5.5 parts of vermiculite, 0.6 parts of 2-methylimidazole zinc salt, 0.4 parts of nano-magnesium oxide, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, and 0.5 parts of lubricating oil are added to the mixture in sequence, mixed evenly, and sealed and plasticized at 200°C. After molding, it is cooled and shaped at 30°C, and the burrs are trimmed to obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0037] Comparative Example 2: Based on Example 1, the amount of boron-based polycarbonate added was adjusted, and an excess amount of boron-based polycarbonate was added, specifically comprising the following steps: 1. Pre-preparation of boron-based polycarbonate: S1-1: 17.5 parts of propylene oxide, 8.7 parts of allyl glycidyl ether, and 0.5 parts of zinc glutarate were mixed, CO2 was introduced and the pressure was increased to 5.2 MPa; the temperature was set to 60°C, and the reaction was stirred for 40 hours to obtain a polymer; S1-2: Add the polymer to 35 mL of dichloromethane, add 95% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add 1 part of benzene-1,4-diboronic acid and 1.2 parts of 1-thioglycerol to tetrahydrofuran, set the temperature to 25°C, stir, add 2.8 g of anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: 17.8 parts of CO2 polycarbonate, 1.7 parts of mercapto borate and 0.2 parts of benzoin dimethyl ether were added to 25 mL of tetrahydrofuran in sequence, and stirred for reaction at room temperature under ultraviolet light for 2 hours to obtain boron-based polycarbonate.

[0038] 2. Preparation of modified ABS plastic: S1-1: 31 parts of basic ABS plastic, 4 parts of 1,3-propylene glycol 2-vinylphenylboronate, 1.5 parts of stearic acid, 9 parts of nano magnesium hydroxide, and 0.2 parts of dibenzoyl peroxide were mixed, the temperature was set at 25° C., and the mixture was rotated and mixed for 8 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0039] 3. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 8 parts of basic ABS plastic and 8 parts of modified ABS plastic are mixed to obtain ABS plastic particles; 16 parts of ABS plastic particles and 45 parts of PP plastic particles are stirred and mixed to obtain a mixed material; S1-2: 12 parts of boron-based polycarbonate, 3.5 parts of glass fiber, 5.5 parts of vermiculite, 0.6 parts of 2-methylimidazole zinc salt, 0.4 parts of nano-magnesium oxide, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, and 0.5 parts of lubricating oil are added to the mixture in sequence, mixed evenly, and sealed and plasticized at 200°C. After molding, it is cooled and shaped at 30°C, and the burrs are trimmed to obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0040] Comparative Example 3: Based on Example 1, the reinforcing material was adjusted, and vermiculite was used as the reinforcing material, specifically comprising the following steps: 1. Pre-preparation of boron-based polycarbonate: S1-1: 17.5 parts of propylene oxide, 8.7 parts of allyl glycidyl ether, and 0.5 parts of zinc glutarate were mixed, CO2 was introduced and the pressure was increased to 5.2 MPa; the temperature was set to 60°C, and the reaction was stirred for 40 hours to obtain a polymer; S1-2: Add the polymer to 35 mL of dichloromethane, add 95% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add 1 part of benzene-1,4-diboronic acid and 1.2 parts of 1-thioglycerol to tetrahydrofuran, set the temperature to 25°C, stir, add 2.8 g of anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: 17.8 parts of CO2 polycarbonate, 1.7 parts of mercapto borate and 0.2 parts of benzoin dimethyl ether were added to 25 mL of tetrahydrofuran in sequence, and stirred for reaction at room temperature under ultraviolet light for 2 hours to obtain boron-based polycarbonate.

[0041] 2. Preparation of modified ABS plastic: S1-1: 31 parts of basic ABS plastic, 4 parts of 1,3-propylene glycol 2-vinylphenylboronate, 1.5 parts of stearic acid, 9 parts of nano magnesium hydroxide, and 0.2 parts of dibenzoyl peroxide were mixed, the temperature was set at 25° C., and the mixture was rotated and mixed for 8 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

[0042] 3. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 8 parts of basic ABS plastic and 8 parts of modified ABS plastic are mixed to obtain ABS plastic particles; 16 parts of ABS plastic particles and 45 parts of PP plastic particles are stirred and mixed to obtain a mixed material; S1-2: Add 4 parts of boron-based polycarbonate, 5.5 parts of vermiculite, 0.6 parts of 2-methylimidazole zinc salt, 0.3 parts of nano-magnesium oxide, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, and 0.5 parts of lubricating oil to the mixture in sequence, mix evenly, and perform closed plasticization at 200°C. After molding, cool and shape at 30°C, trim burrs, and obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0043] Comparative Example 4: Based on Example 1, the composition of the ABS plastic particles was adjusted, and no modified ABS plastic was added to prepare the plastic shell material, specifically comprising the following steps: 1. Pre-preparation of boron-based polycarbonate: S1-1: 17.5 parts of propylene oxide, 8.7 parts of allyl glycidyl ether, and 0.5 parts of zinc glutarate were mixed, CO2 was introduced and the pressure was increased to 5.2 MPa; the temperature was set to 60°C, and the reaction was stirred for 40 hours to obtain a polymer; S1-2: Add the polymer to 35 mL of dichloromethane, add 95% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add 1 part of benzene-1,4-diboronic acid and 1.2 parts of 1-thioglycerol to tetrahydrofuran, set the temperature to 25°C, stir, add 2.8 g of anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: 17.8 parts of CO2 polycarbonate, 1.7 parts of mercapto borate and 0.2 parts of benzoin dimethyl ether were added to 25 mL of tetrahydrofuran in sequence, and stirred for reaction at room temperature under ultraviolet light for 2 hours to obtain boron-based polycarbonate.

[0044] 2. Preparation of high-strength and anti-deformation plastic shell materials for batteries: S1-1: 18 parts of basic ABS plastic and 47 parts of PP plastic particles were stirred and mixed to obtain a mixed material; S1-2: Add 4 parts of boron-based polycarbonate, 3.5 parts of glass fiber, 5.5 parts of vermiculite, 0.6 parts of 2-methylimidazole zinc salt, 0.4 parts of nano-magnesium oxide, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, and 0.5 parts of lubricating oil to the mixture in sequence, mix evenly, and perform closed plasticization at 200°C. After molding, cool and shape at 30°C, trim burrs, and obtain a high-strength, deformation-resistant plastic shell material for batteries.

[0045] Performance Testing: The plastic shell materials prepared in the Examples and Comparative Examples were subjected to performance testing. Their flexural strength was measured using a universal material testing machine at a loading speed of 2 mm / min. The combustion of the plastic shell was observed using an oxygen index meter, and the critical oxygen concentration (OI) and oxygen index were determined using the "up-down method." The temperature at which the plastic shell material lost 5% of its weight during heating was measured using a thermogravimetric analyzer. The data obtained from these performance tests are shown in Table 1: Table 1. Performance test data of examples and comparative examples

[0046] Conclusion: Comparing the performance test related data of the embodiment with that of the comparative example, it can be seen from Examples 1-3 that when the addition amount of boron-based polycarbonate is 4 parts, the composite of glass fiber, vermiculite and boron-based polycarbonate achieves the best reinforcement effect. The rigid skeleton of the glass fiber, the stress dispersion of the vermiculite and the cross-linked network of the boron-based polycarbonate work synergistically to achieve a strong interface bond between the filler and the matrix, so that the bending strength of the prepared plastic shell material is greater and the tensile strength is higher. The three-dimensional cross-linked network of the boron-based polycarbonate restricts the movement of the polymer chain segments, and the thermal reversibility of the borate bond enables the material to maintain structural stability at high temperatures, thereby improving the oxygen index and Td5%, improving flame retardancy, suppressing thermal decomposition of the plastic shell material, and enhancing the thermal stability of the plastic shell material.

[0047] Compared with Example 1, Comparative Examples 1-4 lack rigid support, poor interfacial compatibility, and limited strength improvement, resulting in low mechanical strength and reduced deformation resistance of the plastic shell material. Without the addition of nano-magnesium hydroxide and 2-vinylphenyl borate to the unmodified ABS plastic, the oxygen index and Td5% of the plastic shell material decreased, and the flame retardancy and thermal stability of the plastic shell decreased. In summary, the examples achieve comprehensive optimization of the mechanical strength, deformation resistance, thermal stability, and corrosion resistance of battery plastic shell materials through formulation innovation and component synergy, resulting in a high-strength, deformation-resistant, and highly stable plastic shell material.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high-strength, deformation-resistant plastic shell material for batteries, characterized by: The raw materials of the plastic shell material include the following components: by weight, 14 to 18 parts of ABS plastic particles, 40 to 50 parts of PP plastic particles, 0.1 to 1 part of lubricating oil, 2 to 6 parts of boron-based polycarbonate, 8 to 10 parts of reinforcing material, 0.1 to 2 parts of acid absorbent, and 0.1 to 0.5 parts of antioxidant.

2. The high-strength, anti-deformation plastic shell material for batteries according to claim 1, characterized in that: The preparation method of the boron-based polycarbonate comprises the following steps: S1-1: Propylene oxide, allyl glycidyl ether, and zinc glutarate were mixed, and CO2 was introduced to increase the pressure to 4.8-6.2 MPa; the temperature was set at 58-62°C, and the reaction was stirred for 38-40 hours to obtain a polymer; S1-2: Add the polymer to dichloromethane, add 94-97% hydrochloric acid-ethanol solution, filter, wash, and dry to obtain CO2 polycarbonate; S1-3: Add benzene-1,4-diboronic acid and 1-thioglycerol to tetrahydrofuran, set the temperature to 24-27°C, stir, add anhydrous magnesium sulfate dropwise, stir evenly, filter, concentrate, wash with n-hexane, filter, and dry to obtain mercapto borate; S1-4: CO2 polycarbonate, mercapto borate and benzoin dimethyl ether are sequentially added to tetrahydrofuran, and stirred to react at room temperature under ultraviolet light to obtain boron-based polycarbonate.

3. The high-strength, anti-deformation plastic shell material for batteries according to claim 2, characterized in that: Among the raw materials of the polymer, the mass ratio of propylene oxide, allyl glycidyl ether and zinc glutarate is (34.5-34.9):(17.2-17.5):1; among the raw materials of the mercapto borate, the mass ratio of benzene-1,4-diboric acid and 1-thioglycerol is (0.8-1.1):(0.9-1.2); among the raw materials of the boron-based polycarbonate, the mass ratio of CO2 polycarbonate, mercapto borate and benzoin dimethyl ether is (35.4-35.6):(3.4-3.6):0.2-0.

5.

4. The high-strength, anti-deformation plastic shell material for batteries according to claim 1, characterized in that: The reinforcing material is composed of glass fiber and vermiculite, and the mass ratio of the two is (3-4):(5-6); the acid absorber is composed of 2-methylimidazole zinc salt and nano magnesium oxide, and the mass ratio of the two is 3:2; the antioxidant is composed of antioxidant 1010 and antioxidant 168, and the mass ratio of the two is 1:

1.

5. The high-strength, anti-deformation plastic shell material for batteries according to claim 1, characterized in that: The ABS plastic particles include one or both of basic ABS plastic and modified ABS plastic.

6. The high-strength, anti-deformation plastic shell material for batteries according to claim 5, characterized in that: The ABS plastic particles are composed of basic ABS plastic and modified ABS plastic, and the mass ratio of the basic ABS plastic and modified ABS plastic is 1:

1.

7. The high-strength, anti-deformation plastic shell material for batteries according to claim 5, characterized in that: The preparation method of the modified ABS plastic particles comprises the following steps: S1-1: Mix basic ABS plastic, nano magnesium hydroxide, 1,3-propylene glycol 2-vinylphenylboronic acid ester, stearic acid, and dibenzoyl peroxide, set the temperature to 24-27° C., and rotate and mix for 7-9 minutes to obtain a mixture; S1-2: Extruding and granulating the mixture to obtain modified ABS plastic particles.

8. The high-strength, anti-deformation plastic shell material for batteries according to claim 7, characterized in that: The raw materials in the mixture include, by weight: 30 to 32 parts of basic ABS plastic, 8 to 10 parts of nano magnesium hydroxide, 3 to 5 parts of 1,3-propylene glycol 2-vinylphenylboronic acid ester, 1 to 2 parts of stearic acid, and 0.1 to 0.3 parts of dibenzoyl peroxide; the rotation speed is 1100 to 1300 rpm; and the extrusion temperature is 180 to 200°C.

9. The method for preparing a high-strength, deformation-resistant battery plastic shell material according to claim 1, characterized in that: The following steps are involved: S1-1: Stirring and mixing ABS plastic particles and PP plastic particles to obtain a mixed material; S1-2: Boron-based polycarbonate, reinforcing material, acid absorber, antioxidant and lubricating oil are added to the mixture in sequence, mixed evenly, and sealed for plasticization. After molding, the mixture is cooled and shaped, and burrs are trimmed to obtain a high-strength, deformation-resistant plastic shell material for batteries.

10. The method for preparing a high-strength, deformation-resistant battery plastic shell material according to claim 9, characterized in that: During the sealed plasticizing process, the temperature is 190-210° C.; during the cooling and shaping process, the temperature is 20-35° C.

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