Flame-retardant white PC modified material as well as preparation method and application thereof

Abstract

The invention discloses a flame-retardant white PC modified material which is prepared from the following components in parts by weight: 80-88 parts of PC resin, a flame-retardant system, a heat-resistant modification system, an impact-resistant modification system, a white coloring system and a processing aid. The flame-retardant system is formed by compounding 0.08 to 0.12 part of potassium benzenesulfonyl benzenesulfonate and 0.15 to 0.25 part of a polysiloxane flame-retardant synergist; the heat-resistant system contains 1.2 to 2.0 parts of a styrene-maleic imide heat-resistant agent and 0.2 to 0.4 part of a phosphite ester antioxidant; the anti-impact system is prepared from 3.5 to 5.0 parts of core-shell type acrylate anti-impact agent and 0.8 to 1.5 parts of nano silicon dioxide; in addition, the coating contains 2.0-3.5 parts of titanium dioxide, 0.1-0.3 part of a color matching aid and 0.3-0.5 part of a lubricant. The material can reach the UL94 V-0 level under the wall thickness of 0.8-1.0 mm, does not drop, can pass a 125 DEG C ball pressure test, does not crack when falling at the height of 1 meter, has uniform and stable white appearance, is not easy to yellow, has excellent processability, and is suitable for being used as a charge pal shell material.

Description

Technical Field

[0001] This invention relates to the field of polymer materials, specifically to a flame-retardant white PC modified material, its preparation method, and its application. Background Technology

[0002] With the widespread adoption of portable electronic devices, power banks have become an essential energy storage accessory. As the core protective structure for the battery cells and circuitry, the safety, heat resistance, and mechanical reliability of the casing material directly affect the product's safety and lifespan. Currently, power bank casings are mostly made of white polycarbonate (PC) or PC / ABS alloy. These materials offer good molding and processing performance, electrical insulation, high cleanliness, and a certain level of mechanical strength, meeting the structural support and aesthetic requirements of conventional power banks. They are the mainstream material in the industry. However, in scenarios involving high-power fast charging, outdoor drop impacts, high-temperature exposure, and flame retardancy, existing modified white PC materials generally have performance deficiencies that are difficult to balance, and they can no longer meet mandatory safety standards such as GB 4943.1 and UL94, as well as user needs. Pure PC material has sufficient rigidity but poor low-temperature toughness, is prone to brittleness when dropped, and is susceptible to creep deformation at high temperatures; while ABS improves toughness, it suffers from insufficient heat resistance, high smoke production during combustion, and difficulty in meeting flame retardant standards. To meet flame retardant requirements, the industry often adds halogenated flame retardants or ordinary phosphorus-based flame retardant systems to achieve the UL94 V-0 flame retardant rating.

[0003] Currently, sulfonate flame retardants are the preferred choice for transparent flame retardants in PC. However, the flame retardant efficiency of a single sulfonate flame retardant in thin-walled PC is insufficient, and improper compounding can further reduce the material's heat resistance and impact resistance. Heat resistance modification is often achieved by adding heat-resistant additives, but these can easily antagonize with impact modifiers, making it impossible to achieve a balance of multiple properties. It is difficult to achieve the UL94 V-0 flame retardant rating in 0.8-1.0mm thin-walled specifications, and the addition of flame retardants can easily lead to a decrease in the material's heat resistance, making it unable to pass the 125℃ ball pressure test. Some heat-resistant and flame-retardant PC materials have poor impact resistance; when a power bank is dropped freely from a height of 1 meter onto a hard ground, it is prone to cracking at the four corners or on all six sides.

[0004] Meanwhile, to ensure a stable white appearance, colorants such as titanium dioxide are often added to the formula to give the shell high whiteness and visual consistency. However, directly adding titanium dioxide can easily affect the impact toughness of the material, increasing the risk of cracking upon drop. In addition, as an additive inorganic filler, titanium dioxide may produce a "wick effect" when the composite material is burning, weakening the flame retardant properties of the final product and causing color deviation, yellowing appearance, and difficulty in matching the color sample requirements.

[0005] For example, CN200710074663.8 discloses a flame-retardant PC composite material and its preparation method. This composite material is formulated from the following raw materials in the indicated weight ratios: 69-73% polycarbonate; 8-12% titanium dioxide; 7-8% thermoplastic elastomer; 9-11.5% flame retardant; and 0.5-2% antioxidant. PC itself is a material with excellent toughness, but adding 9-11.5% flame retardant (whether organophosphates or sulfonates) typically significantly reduces the molecular chain fluidity of PC. Although 7-8% thermoplastic elastomer is added as a toughening agent, at high addition levels, the elastomer often cannot completely compensate for the brittleness introduced by the flame retardant. The material is prone to brittle fracture. While the 8-12% titanium dioxide addition provides excellent hiding power (suitable for light-colored or white products), high titanium dioxide content increases melt viscosity. If the dispersion is uneven, "flow marks" or "white spots" are likely to appear on the surface of the product. Overall, in order to achieve a high flame retardancy rating, this material sacrifices some of the original heat resistance and impact advantages of PC. At the same time, the high content of additives poses challenges to long-term production stability and product aging resistance.

[0006] In summary, existing white PC modified materials struggle to achieve a synergistic balance between high flame retardancy, high heat resistance, drop resistance, and a durable white appearance. Flame retardancy, heat resistance, and impact resistance are mutually restrictive, and thin-walled components exhibit significant degradation in flame retardancy and mechanical properties, failing to meet the development needs of high-power, high-safety mobile power supplies.

[0007] Therefore, developing a white PC modified material that combines high flame retardancy, heat resistance, drop resistance, and stable appearance is of great practical significance for improving the overall safety performance of mobile power banks. Summary of the Invention

[0008] The purpose of this invention is to overcome at least one deficiency of the prior art and to provide a flame-retardant white PC modified material, its preparation method and application.

[0009] The technical solution adopted in this invention is: In a first aspect, the present invention provides a flame-retardant white modified PC material, which, by weight, is composed of the following raw materials: 80-88 parts of PC resin; Flame retardant system: 0.08-0.12 parts of potassium benzenesulfonylbenzenesulfonate and 0.15-0.25 parts of polysiloxane flame retardant synergist; Heat-resistant modification system: 1.2-2.0 parts of styrene-maleic imide heat resistant agent and 0.2-0.4 parts of phosphite antioxidant; Impact-resistant modification system: 3.5-5.0 parts of core-shell acrylate impact agent and 0.8-1.5 parts of nano-silica; White coloring system: 2.0-3.5 parts titanium dioxide and 0.1-0.3 parts colorant; Processing aids: 0.3-0.5 parts of lubricant.

[0010] In some instances, the color-correcting agent is any one of a silane coupling agent, a phosphite antioxidant, or a polyethylene wax.

[0011] In some examples, the preferred raw material composition of the flame-retardant white PC modified material by weight is as follows: 82-85 parts PC resin, 0.09-0.11 parts potassium benzenesulfonylbenzenesulfonate, 0.18-0.22 parts polysiloxane flame retardant synergist, 1.5-1.8 parts styrene-maleic imide heat resistant agent, 0.3-0.35 parts phosphite antioxidant, 4.0-4.5 parts core-shell acrylate impact resistant agent, 1.0-1.3 parts nano silica, 2.5-3.0 parts titanium dioxide, 0.2-0.25 parts colorant, and 0.4-0.45 parts lubricant.

[0012] In some instances, the particle size of the nano-silica is 10-30 nm.

[0013] In some instances, the titanium dioxide is rutile and has a particle size of 0.2-0.3 μm.

[0014] Secondly, the present invention provides a method for preparing a flame-retardant white PC modified material, comprising the following steps: Pretreatment: Dry the PC resin at 80-90℃ for 4-6 hours; pretreat the titanium dioxide and nano-silica with a coupling agent; Mixing: Take the dried PC resin, flame retardant system, heat resistant modification system, impact resistant modification system, white coloring system and processing aids according to the formula, put them into a high-speed mixer, and mix for 5-8 minutes at a speed of 1000-1200 r / min to obtain the premix; Extrusion granulation: The premixed material is fed into a twin-screw extruder and melt-extruded at an extrusion temperature of 240-265℃ and a screw speed of 300-400r / min. Modified PC particles are obtained after post-treatment.

[0015] Thirdly, the present invention provides an injection molded article, which is an injection molded article obtained by injection molding of flame retardant white modified PC particles prepared by the above-mentioned flame retardant white PC modified material or preparation method.

[0016] In some instances, the thickness of the injection-molded product is 0.8-1.0 mm, and the injection-molded product is a power bank casing.

[0017] In some instances, the injection molding conditions include: injection temperature of 250-270°C and mold temperature of 60-70°C.

[0018] Fourthly, this invention provides an application of flame-retardant white PC modified material in the casing of a power bank.

[0019] The beneficial effects of this invention are: (1) This application combines potassium benzenesulfonylbenzenesulfonate with polysiloxane flame retardant synergist. The polysiloxane flame retardant synergist has both hydrophobicity and thermal stability, which reduces the erosion of the resin matrix by moisture. Even with a low addition amount (less than 0.4 parts in total), the flame retardant efficiency can still be improved. Products with a thickness of 0.8-1.0 mm can stably reach UL94 V-0 level without dripping, and have little impact on the whiteness of the material (the combination of organic salt flame retardant and silicon synergist achieves high-efficiency flame retardancy without affecting whiteness), which is suitable for the flame retardant safety requirements of power banks.

[0020] (2) The styrene-maleic imide heat resistant agent and the phosphite antioxidant work synergistically. The phosphite antioxidant effectively inhibits the oxidative degradation in a humid and hot environment, improves the thermal stability of the material, and can pass the ball pressure test at 125℃. It maintains the structural strength at high temperature and keeps the heat distortion temperature (HDT) stable at 124-137℃, which is much higher than that of ordinary PC modified materials (the lowest in the comparative example is only 104℃).

[0021] (3) Core-shell type acrylate impact agent and nano silica work together to toughen the PC matrix. The core-shell type acrylate impact agent has good compatibility with the PC matrix and is not easy to peel off under humid and hot conditions. While maintaining rigidity, the drop integrity rate can reach 96-100%, which is better than most comparative examples. The heat resistance agent and impact agent coexist, avoiding the contradiction of increased heat resistance but decreased toughness in traditional PC modification.

[0022] (4) Rutile titanium dioxide, when combined with color-matching additives, can be precisely matched to white color plates without affecting flame retardancy and mechanical properties. The surface of the product is uniform and free from yellowing. Antioxidants work synergistically with titanium dioxide to improve aging resistance and maintain color stability.

[0023] (5) The appropriate addition of lubricant further optimizes the processing window, avoiding molding defects caused by poor fluidity or strength reduction caused by excessive fluidity. The components have excellent compatibility, stable extrusion and injection molding processes, and are suitable for mass production of power bank shells. Detailed Implementation

[0024] The following disclosure provides many different implementations or examples for different ways of implementing the present invention.

[0025] Example 1 A flame-retardant white modified PC material, by weight: 82 parts PC resin, 0.09 parts potassium benzenesulfonylbenzenesulfonate, 0.18 parts polysiloxane synergist, 1.5 parts styrene-maleic imide heat resistant agent, 0.3 parts phosphite antioxidant, 4.0 parts core-shell acrylate impact resistant agent, 1.0 part nano silica, 2.5 parts rutile titanium dioxide, 0.2 parts colorant, and 0.4 parts lubricant. Exemplarily, the bisphenol A content in the PC resin of this application is <50 ppm.

[0026] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. Preparation method: PC resin is dried at 85℃ for 5 hours. The PC resin is spread evenly, with a thickness not exceeding 2 / 3 of the tray height. The oven needs to be preheated to the set temperature before placing the PC resin in. Titanium dioxide and nano-silica are pretreated with a silane coupling agent. The specific operation is as follows: Weigh the titanium dioxide and nano-silica according to the formula ratio, put them into a high-speed mixer, and first stir at low speed until uniformly mixed. Dilute the coupling agent with anhydrous ethanol or industrial alcohol at a ratio of 1:1–1:2, and add it evenly by spraying while stirring. Mix at high speed (800–1000 r / min) for 5–10 minutes to ensure thorough coating and discharge for later use; The components were mixed at 1100 r / min for 6 min according to the formula to obtain the premix. Extrusion using a twin-screw extruder at a temperature of 245-260℃ and a rotation speed of 350 r / min, followed by pelleting and drying. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0027] Example 2 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 85 parts PC resin, 0.11 parts potassium benzenesulfonylbenzenesulfonate, 0.22 parts polysiloxane synergist, 1.8 parts styrene-maleic imide heat resistant agent, 0.35 parts phosphite antioxidant, 4.5 parts core-shell acrylate impact resistant agent, 1.3 parts nano silica, 3.0 parts rutile titanium dioxide, 0.25 parts colorant, and 0.45 parts lubricant.

[0028] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (1mm thickness) using an injection molding machine with a mold temperature of 65℃, resulting in a 1mm thick power bank shell.

[0029] Example 3 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 83 parts PC resin, 0.1 parts potassium benzenesulfonylbenzenesulfonate, 0.2 parts polysiloxane synergist, 1.6 parts styrene-maleic imide heat resistant agent, 0.33 parts phosphite antioxidant, 4.2 parts core-shell acrylate impact resistant agent, 1.2 parts nano silica, 2.8 parts rutile titanium dioxide, 0.22 parts colorant, and 0.4 parts lubricant.

[0030] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0031] Example 4 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0032] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0033] Example 5 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 81 parts PC resin, 0.09 parts potassium benzenesulfonylbenzenesulfonate, 0.16 parts polysiloxane synergist, 1.3 parts styrene-maleic imide heat resistant agent, 0.22 parts phosphite antioxidant, 3.7 parts core-shell acrylate impact resistant agent, 0.9 parts nano silica, 3.2 parts rutile titanium dioxide, 0.15 parts colorant, and 0.35 parts lubricant.

[0034] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0035] Example 6 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 86 parts PC resin, 0.1 parts potassium benzenesulfonylbenzenesulfonate, 0.17 parts polysiloxane synergist, 1.4 parts styrene-maleic imide heat resistant agent, 0.24 parts phosphite antioxidant, 3.9 parts core-shell acrylate impact resistant agent, 1.4 parts nano silica, 3.3 parts rutile titanium dioxide, 0.18 parts colorant, and 0.3 parts lubricant.

[0036] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (1mm thickness) using an injection molding machine with a mold temperature of 65℃, resulting in a 1mm thick power bank shell.

[0037] Example 7 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 87 parts PC resin, 0.11 parts potassium benzenesulfonylbenzenesulfonate, 0.23 parts polysiloxane synergist, 1.9 parts styrene-maleic imide heat resistant agent, 0.36 parts phosphite antioxidant, 4.7 parts core-shell acrylate impact resistant agent, 1.5 parts nano silica, 3.4 parts rutile titanium dioxide, 0.2 parts colorant, and 0.5 parts lubricant.

[0038] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (1mm thickness) using an injection molding machine with a mold temperature of 65℃, resulting in a 1mm thick power bank shell.

[0039] Example 8 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 88 parts PC resin, 0.12 parts potassium benzenesulfonylbenzenesulfonate, 0.24 parts polysiloxane synergist, 2 parts styrene-maleic imide heat resistant agent, 0.38 parts phosphite antioxidant, 4.9 parts core-shell acrylate impact resistant agent, 1.5 parts nano silica, 3.5 parts rutile titanium dioxide, 0.3 parts colorant, and 0.35 parts lubricant.

[0040] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0041] Example 9 A highly flame-retardant, heat-resistant, and drop-resistant white PC modified material suitable for power banks, comprising, by weight: 88 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.25 parts polysiloxane synergist, 1.3 parts styrene-maleic imide heat resistant agent, 0.4 parts phosphite antioxidant, 5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 3.0 parts rutile titanium dioxide, 0.3 parts colorant, and 0.5 parts lubricant.

[0042] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0043] Comparative Example 1 The difference between Comparative Example 1 and Example 4 is that the weight percentage of potassium benzenesulfonylbenzenesulfonate and polysiloxane is lower in Comparative Example 1 than in Example 4, while the other components are the same as in Example 4.

[0044] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.06 parts potassium benzenesulfonylbenzenesulfonate, 0.1 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0045] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0046] Comparative Example 2 The difference between Comparative Example 2 and Example 4 is that the weight percentage of potassium benzenesulfonylbenzenesulfonate and polysiloxane is higher in Comparative Example 2 than in Example 4, while the other components are the same as in Example 4.

[0047] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.14 parts potassium benzenesulfonylbenzenesulfonate, 0.3 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0048] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0049] Comparative Example 3 The difference between Comparative Example 3 and Example 4 is that the weight parts of styrene-maleic imide and phosphite are lower in Comparative Example 3 than in Example 4, while the other components are the same as in Example 4.

[0050] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1 part styrene-maleic imide heat resistant agent, 0.1 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0051] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0052] Comparative Example 4 The difference between Comparative Example 4 and Example 4 is that the weight proportions of styrene-maleic imide and phosphite are higher in Comparative Example 4, while the other components are the same as in Example 4.

[0053] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 2.2 parts styrene-maleic imide heat resistant agent, 0.5 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0054] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0055] Comparative Example 5 The difference between Comparative Example 5 and Example 4 is that the weight percentages of core-shell acrylate and nano-silica are lower in Comparative Example 5 than in Example 4, while the other components are the same as in Example 4.

[0056] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3 parts core-shell acrylate impact resistant agent, 0.6 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0057] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0058] Comparative Example 6 The difference between Comparative Example 6 and Example 4 is that the weight proportions of core-shell acrylate and nano silica are higher in Comparative Example 6 than in Example 4, while the other components are the same as in Example 4.

[0059] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 5.5 parts core-shell acrylate impact resistant agent, 1.7 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0060] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0061] Comparative Example 7 The difference between Comparative Example 7 and Example 4 is that the weight of titanium dioxide is lower in Comparative Example 7 than in Example 4, while the other components are the same as in Example 4.

[0062] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.0 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0063] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0064] Comparative Example 8 The difference between Comparative Example 8 and Example 4 is that the weight of titanium dioxide is higher in Comparative Example 8 than in Example 4, while the other components are the same as in Example 4.

[0065] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 4.0 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0066] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0067] Comparative Example 9 The difference between Comparative Example 9 and Example 4 is that the weight of the lubricant is lower in Comparative Example 9 than in Example 4, while the other components are the same as in Example 4.

[0068] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.2 parts lubricant.

[0069] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0070] Comparative Example 10 The difference between Comparative Example 10 and Example 4 is that the weight percentage of lubricant is higher in Comparative Example 10 than in Example 4, while the other components are the same as in Example 4.

[0071] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.6 parts lubricant.

[0072] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0073] Comparative Example 11 The difference between Comparative Example 10 and Example 4 is that no polysiloxane was added, while the other components are the same as in Example 4.

[0074] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact resistant agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0075] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0076] Comparative Example 12 The difference between Comparative Example 10 and Example 4 is that the styrene-maleic imide heat resistant agent is replaced with N-phenylmaleimide (NPMI) copolymer, while the other components are the same as in Example 4.

[0077] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts N-phenylmaleimide (NPMI) copolymer, 0.2 parts phosphite antioxidant, 3.5 parts core-shell acrylate impact agent, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.3 parts lubricant.

[0078] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0079] Comparative Example 13 The difference between Comparative Example 10 and Example 4 is that the core-shell type acrylate impact agent is replaced with weather-resistant acrylate, while the other components are the same as in Example 4.

[0080] Specifically, it is a white modified PC material, comprising, by weight: 80 parts PC resin, 0.08 parts potassium benzenesulfonylbenzenesulfonate, 0.15 parts polysiloxane synergist, 1.2 parts styrene-maleic imide heat resistant agent, 0.2 parts phosphite antioxidant, 3.5 parts weather-resistant acrylate, 0.8 parts nano silica, 2.5 parts rutile titanium dioxide, 0.1 parts colorant, and 0.6 parts lubricant.

[0081] The color-correcting agent is a silane coupling agent; the silica has a particle size of 10-30 nm; and the titanium dioxide is rutile with a particle size of 0.2-0.3 μm. The preparation method is the same as in Example 1. The power bank shell is injection molded at 255-265℃ (thickness 0.8mm) using an injection molding machine with a mold temperature of 65℃, resulting in a thickness of 0.8mm.

[0082] The following experiments were conducted to verify the above-mentioned Examples 1-9 and Comparative Examples 1-13.

[0083] Experiment 1 Experiment Title: Flame Retardant Performance and Heat Deflection Temperature Test Participants: Examples 1-9, Comparative Examples 1-13 Equipment: Oxygen Index Tester (Jiangsu Jinda Instruments Co., Ltd., JF-3), Heat Deflection Temperature Tester (Shanghai Precision Instruments Co., Ltd., XHDT-300), UL-94 Vertical Burning Tester (Qingdao Shanyue, SY-94) Methods: S1: Vacuum dry the granulated samples of each example and comparative example at 80-100℃ for 6-10 hours. S2: Prepare test strips of corresponding thicknesses using an injection molding machine (Haitian, MA2000 / 5600) at 280-300℃. S3: Test the Limiting Oxygen Index (LOI) according to GB / T 2406.2, test the Heat Deflection Temperature (HDT) according to GB / T 1634.2, and perform the UL-94 vertical burning test. Data: LOI, HDT, and UL-94 rating of each sample. Experimental Analysis: This experiment compares and analyzes the performance of different embodiments and comparative examples in terms of flame retardant properties and heat distortion temperature.

[0084] Experiment 2 Experiment Title: Drop Resistance Test Participants: Examples 1-9, Comparative Examples 1-13 Equipment: Drop tester (Labthink, JDC-1), standard drop height 1.5-2.0 meters Method: S1: Drop the samples freely from a height of 1.5-2.0 meters onto a steel plate, repeating the test 5 times. S2: Observe and record the sample damage, and count the number of intact samples without cracks. Data: Integrity rate of each sample after drop. Analysis: This experiment compares and analyzes the drop resistance of different examples and comparative examples.

[0085] Experiment 3 Experiment Title: Whiteness and Appearance Performance Test Participants: Examples 1-9, Comparative Examples 1-13 Equipment: Whiteness meter (Shanghai Precision Instruments Co., Ltd., WSB-3A), colorimeter (Konica Minolta, CR-400) Methods: S1: Each sample was injection molded into a 100mm × 100mm × 2mm thin plate. S2: The blue light whiteness value was measured using a whiteness meter (according to GB / T 5950), and the L value was measured using a colorimeter. S3: Each group of samples was tested 3 times, and the average value was taken. Data: Whiteness value and L value of each sample. Analysis: This experiment compares and analyzes the differences in whiteness and appearance between different examples and comparative examples.

[0086] Experiment 4 Experiment Title: Flowability and Processing Performance Test Participants: Examples 1-9, Comparative Examples 1-13 Equipment: Melt Flow Rate Tester (Chengde Testing Machine Co., Ltd., MFI-400) Methods: S1: After drying each sample, a suitable amount was taken for melt flow rate (MFR) testing according to GB / T 3682 standard. S2: Test temperature 300℃, load 2.16kg. S3: Each group of samples was tested 3 times, and the average value was taken. Data: MFR values ​​of each sample. Analysis: This experiment compares and analyzes the flowability performance of different examples and comparative examples.

[0087] Experiment 5 Experiment Title: High Temperature and High Humidity Service Stability Test Participants: Examples 1-9, Comparative Examples 1-13 Equipment: Constant Temperature and Humidity Chamber (Shanghai Yiheng, LRHS-100), Tensile Testing Machine (Instron, 3365) Methods: S1: Standard tensile specimens were prepared for each sample and dried at 80-100℃ for 6-10 hours. S2: The samples were aged at 85℃ and 85%RH for 500 hours. S3: Tensile strength and elongation at break were tested after aging. Data: Changes in tensile strength and elongation at break before and after aging. Analysis: This experiment compares and analyzes the performance retention rates of different examples and comparative examples under long-term high temperature and high humidity service conditions.

[0088] Performance Comparison Table of Examples 1-9 and Comparative Examples 1-13 Table 1 The experimental data show that Examples 1–9 exhibit excellent performance in terms of flame retardancy, heat resistance, impact resistance, color performance, processing fluidity, and resistance to damp heat aging. Their overall performance is stable and suitable for high-performance applications.

[0089] In the comparative examples, some samples have obvious shortcomings in one or more key performance aspects. In particular, in comparative examples 1, 3, 7, 10, and 13, the heat resistance, color, impact resistance, or aging resistance are poor, making it difficult to meet the harsh usage conditions.

[0090] The above is a further detailed description of the present invention and should not be considered as a limitation on the specific implementation of the present invention. For those skilled in the art, simple deductions or substitutions without departing from the concept of the present invention are all within the protection scope of the present invention.

Claims

1. A flame-retardant white modified PC material, characterized in that, By weight, the raw materials consist of the following components: 80-88 parts PC resin; flame retardant system: 0.08-0.12 parts potassium benzenesulfonylbenzenesulfonate and 0.15-0.25 parts polysiloxane flame retardant synergist; heat resistance modification system: 1.2-2.0 parts styrene-maleic imide heat resistant agent and 0.2-0.4 parts phosphite antioxidant; impact resistance modification system: 3.5-5.0 parts core-shell acrylate impact resistant agent and 0.8-1.5 parts nano silica; white coloring system: 2.0-3.5 parts titanium dioxide and 0.1-0.3 parts coloring agent; processing aid: 0.3-0.5 parts lubricant.

2. The flame-retardant white PC modified material according to claim 1, characterized in that, The color-correcting agent is any one of silane coupling agents, phosphite antioxidants, and polyethylene wax.

3. The flame-retardant white PC modified material according to claim 2, characterized in that, The preferred raw material composition by weight is as follows: 82-85 parts PC resin, 0.09-0.11 parts potassium benzenesulfonylbenzenesulfonate, 0.18-0.22 parts polysiloxane flame retardant synergist, 1.5-1.8 parts styrene-maleic imide heat resistant agent, 0.3-0.35 parts phosphite antioxidant, 4.0-4.5 parts core-shell acrylate impact resistant agent, 1.0-1.3 parts nano silica, 2.5-3.0 parts titanium dioxide, 0.2-0.25 parts colorant, and 0.4-0.45 parts lubricant.

4. The PC modified material according to claim 1, characterized in that, The particle size of the nano-silica is 10-30 nm.

5. The PC modified material according to claim 1, characterized in that, The titanium dioxide is rutile type with a particle size of 0.2-0.3 μm.

6. A method for preparing a flame-retardant white PC modified material according to any one of claims 1-5, characterized in that, Includes the following steps: Pretreatment: Dry the PC resin at 80-90℃ for 4-6 hours; pretreat the titanium dioxide and nano-silica with a coupling agent; Mixing: Take the dried PC resin, flame retardant system, heat resistant modification system, impact resistant modification system, white coloring system and processing aids according to the formula, put them into a high-speed mixer, and mix for 5-8 minutes at a speed of 1000-1200 r / min to obtain the premix; Extrusion granulation: The premixed material is fed into a twin-screw extruder and melt-extruded at an extrusion temperature of 240-265℃ and a screw speed of 300-400r / min. Modified PC particles are obtained after post-treatment.

7. An injection molded article, comprising flame-retardant white modified PC particles prepared by the flame-retardant white modified PC material according to any one of claims 1-5 or the flame-retardant white modified PC material preparation method according to claim 6, and obtained by injection molding.

8. The injection-molded article according to claim 7, characterized in that, The thickness of the injection-molded product is 0.8-1.0 mm, and the product is a power bank shell.

9. The injection-molded article according to claim 8, characterized in that, The injection molding conditions include: injection temperature 250-270℃, mold temperature 60-70℃.

10. The application of a flame-retardant white PC modified material as described in any one of claims 1-5 in the casing of a power bank.

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