Flame-retardant PC frosted composite material with high recovery ratio and bending deformation resistance

Abstract

The invention relates to a flame-retardant PC (polycarbonate) frosted composite material with high recovery ratio and bending deformation resistance, which comprises the following components in parts by weight: 70-99.25 parts by mass of PC; 0.5 to 20 parts by mass of a frosted auxiliary agent; 0-10 parts by mass of a toughening agent; 0.1-5 parts by mass of a flame retardant; 0.05 to 2 parts by mass of an anti-dripping agent; 0.05 to 2 parts by mass of an antioxidant; the invention has the following beneficial effects: by using the PCR PC and the surface modified talcum powder, the compatibility and the surface binding force between the PC and the surface modified talcum powder can be improved, and under the condition of meeting high bending modulus, the material and the product can have a frosted effect without performing frosted treatment on an injection mold in the early stage; the flame retardants used in the invention are halogen-free flame retardants, are environment-friendly, do not cause secondary pollution to the environment, have the advantages of small addition amount and obvious flame retardant improvement effect, and can realize and meet the flame retardant grade under the condition of ultrathin thickness (less than or equal to 1.0 mm).

Description

[Technical Field]

[0001] This invention relates to the field of polycarbonate composite materials technology, and in particular to a flame-retardant PC frosted composite material that combines a high recycling rate and resistance to bending deformation. [Background Technology]

[0002] Polycarbonate (PC) is a high-molecular-weight polymer containing carbonate groups in its molecular chain. It is an engineering plastic with excellent comprehensive properties (such as mechanical properties, dimensional stability, toughness, heat resistance, UV resistance, and electrical properties). Based on the structure of the ester groups, it can be divided into aliphatic, aromatic, and aliphatic-aromatic types. However, aliphatic and aliphatic-aromatic polycarbonates have lower mechanical properties, thus limiting their application in engineering plastics. PC itself has a UL94V-2 flame retardant rating and drips when exposed to fire. The three main application areas for engineering plastics are the glass assembly industry, the automotive industry, and the electronics and electrical appliance industry. In actual production and application, PC needs to be modified according to specific requirements, such as increasing toughness, improving molding and processing performance, reducing residual deformation, and enhancing flame retardancy.

[0003] Frosting refers to making an originally smooth surface rough, so that when light shines on it, diffuse reflection occurs (the phenomenon that light projected onto a rough surface is reflected in all directions), and such products are called frosted products.

[0004] Currently, common methods for manufacturing frosted products include: surface frosting assistance (such as molds) and adding auxiliary materials (such as organosilicon microspheres, organosilicon powder, square barium sulfate, etc.). However, the former involves complex processes, troublesome maintenance, and high production costs, while the latter involves difficulty in controlling the particle size of the added materials and the stability of the frosting effect in the material and the finished product. In addition, the price of organosilicon resin is also high, and the flame retardancy and mechanical properties of the materials are not considered. Therefore, it is impossible to achieve a combination of frosting, flame retardancy, and mechanical properties.

[0005] In view of this, it is necessary to provide a flame-retardant PC frosted composite material that has both a high recycling rate and resistance to bending deformation in order to solve the above problems. [Summary of the Invention]

[0006] The technical problem this invention aims to solve is that current common methods for manufacturing frosted products, such as surface abrasion assistance and adding auxiliary materials, are problematic. The former involves complex processes, cumbersome maintenance, and high production costs, while the latter suffers from difficulties in controlling the particle size of the added materials and fails to consider the flame retardancy and mechanical properties of the material. Therefore, it is impossible to achieve a combination of abrasiveness, flame retardancy, and mechanical properties. This invention provides a flame-retardant PC frosted composite material with both high recyclability and resistance to bending deformation to address these issues.

[0007] The solution to the technical problem of this invention is:

[0008] A flame-retardant PC frosted composite material that combines high recyclability and resistance to flexural deformation, characterized in that it comprises the following components in parts by weight:

[0009] PC, 70–99.25 parts by weight;

[0010] Abrasive additive, 0.5–20 parts by weight;

[0011] Toughening agent, 0-10 parts by weight;

[0012] Flame retardant, 0.1 to 5 parts by weight;

[0013] Anti-dripping agent, 0.05–2 parts by weight;

[0014] Antioxidant, 0.05–2 parts by weight;

[0015] Colorant, 0.05 to 2 parts by weight.

[0016] The high recovery rate in this invention refers to the content of PCR PC in the material being ≥78%.

[0017] The frosted effect in this invention refers to a surface gloss level of 40-60 GU, preferably 40-50 GU, after injection molding a color plate with a mirror mold core of model 3000.

[0018] The selected polycarbonate is one or more of the following: bisphenol A type polycarbonate, polyester type polycarbonate, organosilicon copolymer PC, cyclohexane bisphenol A type polycarbonate, and high-temperature resistant polycarbonate synthesized by bisphenol TMC. The melt flow rate of the PC is between (10~70) g / 10min (300℃ / 1.2kg), the weight average molecular weight is between 20000 and 50000, and the molecular weight distribution is between 1 and 2.6. It can be virgin PC or recycled PC (PCR PC).

[0019] The selected abrasive additive can be one or more of inorganic additives, organic additives, polymeric additives, and their derivatives, and their compounding and use.

[0020] The selected toughening agent may be one or more of the following: unsaturated rubber, saturated rubber, silicone rubber, styrene thermoplastic elastomers, polyurethane thermoplastic elastomers, high-density polyethylene (HDPE), polyolefin thermoplastic elastomers, polyamide thermoplastic elastomers, high-rubber powders, acrylate copolymers (ACR), and their derivatives.

[0021] The selected flame retardant may be one or more of the following: hypophosphite flame retardant, phosphate ester flame retardant, sulfonate flame retardant, organosilicon flame retardant, and their derivatives.

[0022] The selected anti-dripping agent is a fluorinated PTFE material, including core-shell coated PTFE material and uncoated PTFE (pure powder) material.

[0023] The selected antioxidant can be one or more of hindered phenolic, phosphite, and thiolated antioxidants, in combination and use.

[0024] The selected colorant, based on its composition, can be a combination and use of one or more of the following: pure carbon black, oil-based black, dye, manganese iron black, chromium copper black, carriers with different types (lubricant powder, resin powder, etc.) and dispersants. The form of the above colorant can be a combination and use of one or more of the following: pure powder, colored sand, color masterbatch.

[0025] A product characterized in that it is prepared by using PC and a sanding agent to obtain a flame-retardant PC sanding composite material with both high recyclability and resistance to bending deformation, and the injection mold does not need to be sanded in the early stage.

[0026] The beneficial effects of this invention are:

[0027] 1. The PC used in this invention is recycled PC (PCR PC), which comes from everyday production and life, such as drinking water bottles, CDs, etc. This not only reduces carbon dioxide emissions, but also reduces energy consumption.

[0028] 2. The abrasive agent selected in this invention is surface-modified talc powder. After addition, it can improve the compatibility and surface bonding force with PC. Under the condition of meeting the high flexural modulus (meeting the high rigidity requirement of 3C electronic product shells), the material and product can have a frosted effect without the need for pre-treatment of the injection mold.

[0029] 3. The flame retardants used in this invention are all halogen-free and phosphorus-free additives, which are environmentally friendly materials that comply with and meet national and international regulations and will not cause secondary pollution to the environment. They are characterized by low addition amount and significant flame retardant effect. Furthermore, through combination and formulation, flame retardant requirements and fire resistance ratings can be achieved in systems containing PC, toughening materials and inorganic minerals with ultra-thin thicknesses (≤1.0mm).

Detailed Implementation Methods

[0030] To further illustrate the technical means and effects of the present invention, the following describes the embodiments of the present invention in detail.

[0031] This invention provides a flame-retardant PC frosted composite material that combines high recyclability and resistance to flexural deformation, characterized in that it comprises the following components in parts by weight:

[0032] PC, 70–99.25 parts by weight;

[0033] Abrasive additive, 0.5–20 parts by weight;

[0034] Toughening agent, 0-10 parts by weight;

[0035] Flame retardant, 0.1 to 5 parts by weight;

[0036] Anti-dripping agent, 0.05–2 parts by weight;

[0037] Antioxidant, 0.05–2 parts by weight;

[0038] Colorant, 0.05 to 2 parts by weight.

[0039] The high recovery rate in this invention refers to the content of PCR PC in the material being ≥78%.

[0040] The frosted effect in this invention refers to a surface gloss level of 40-60 GU, preferably 40-50 GU, after injection molding a color plate with a mirror mold core of model 3000.

[0041] The selected polycarbonate is one or more of the following: bisphenol A type polycarbonate, polyester type polycarbonate, organosilicon copolymer PC, cyclohexane bisphenol A type polycarbonate, and high-temperature resistant polycarbonate synthesized by bisphenol TMC. The melt flow rate of the PC is between (10~70) g / 10min (300℃ / 1.2kg), the weight average molecular weight is between 20000 and 50000, and the molecular weight distribution is between 1 and 2.6. It can be virgin PC or recycled PC (PCR PC).

[0042] The selected abrasive additives may be inorganic additives (such as inorganic silica microspheres (average particle size 15-50 μm), nano barium sulfate (average particle size 1-3 μm), surface-modified talc powder (divided into different finenesses and different aspect ratios)), organic additives (such as organosilicon microspheres (average particle size 4-8 μm)), polymeric additives (such as PMMA microspheres (average particle size 5-15 μm)), and their derivatives, as well as one or more of these additives in combination and use.

[0043] The selected toughening agent can be an unsaturated rubber (e.g., nitrile rubber (NBR), natural rubber (NR), styrene-butadiene rubber (SBR), cis-butadiene rubber (BR)), a saturated rubber (e.g., butyl rubber (IIR), ethylene propylene rubber (EPR), ethylene propylene diene monomer (EPDM), halogenated butyl rubber), silicone rubber, or a styrene-based thermoplastic elastomer (e.g., core-shell structured methyl methacrylate-butadiene-styrene terpolymer (MBS), styrene-butadiene-styrene block copolymer (SBS), hydrogenated SBS (S... The compounding and use of one or more of the following: EBS, styrene-isoprene-styrene (SIS), polyurethane thermoplastic elastomers (e.g., TPU), high-density polyethylene (HDPE), polyolefin thermoplastic elastomers (e.g., chlorinated polyethylene (CPE), ethylene-octene copolymer (POE), thermoplastic dynamic vulcanizate (TPV), ethylene-vinyl acetate copolymer (EVA)), polyamide thermoplastic elastomers (e.g., TPAE), high-rubber powders, acrylate copolymers (ACR), etc., and their derivatives.

[0044] The selected flame retardant may be a combination of one or more of the following: hypophosphite flame retardants (e.g., vinyl aluminum hypophosphite, vinyl hypophosphite), phosphate ester flame retardants (e.g., 1,3-phenylene phosphate (2,6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivatives flame retardant (BDP), tetraphenyl resorcinol diphosphate and its derivatives (RDP) flame retardant, triphenyl phosphate (TPP) flame retardant), sulfonate flame retardants (e.g., potassium benzenesulfonylbenzenesulfonate (KSS), potassium perfluorobutyl sulfonate (PPFBS), sodium 2,4,5-trichlorobenzenesulfonate (STB)), organosilicon flame retardants (e.g., polysiloxane and its derivatives flame retardants, cross-linked polydimethylsiloxane (PDMS)), etc.

[0045] The selected anti-dripping agent is a fluorinated PTFE material, including core-shell coated PTFE material and uncoated PTFE (pure powder) material.

[0046] The selected antioxidants can be one or more of the following: hindered phenols (e.g., (β-3,5-di-tert-butyl-4-hydroxyphenyl) acrylate), phosphites (e.g., tris(2,4-di-tert-butylphenyl) phosphites, pentaerythritol diphosphite), and thiolated antioxidants, in combination and use.

[0047] The selected colorant, based on its composition, can be a combination and use of one or more of the following: pure carbon black, oil-based black, dye, manganese iron black, chromium copper black, carriers with different types (lubricant powder, resin powder, etc.) and dispersants. The form of the above colorant can be a combination and use of one or more of the following: pure powder, colored sand, color masterbatch.

[0048] Example 1

[0049] A flame-retardant PC frosted composite material with both high recyclability and resistance to flexural deformation comprises the following components in parts by weight: 88.4 parts PCR PC, 10 parts surface-modified talc, 0 parts toughening agent, 0.25 parts sulfonate flame retardant, 0.45 parts organosilicon flame retardant, 0.3 parts anti-dripping agent, 0.3 parts antioxidant, and 0.3 parts colorant.

[0050] The selected PC is recycled PC (PCR PC), which is a bisphenol A type linear polycarbonate synthesized using the phosgene method. The MI is 45 g / 10 min (300℃ / 1.2 Kg), the weight average molecular weight is between 49,000 and 50,000, and the molecular weight distribution is between 1.9 and 2.2.

[0051] The selected abrasive additive is surface-modified talc powder, which belongs to the category of inorganic mineral powder additives. Its fineness is 2000 mesh or higher, and its diameter-to-thickness ratio is 5:1. After carefully selecting ore raw materials and undergoing processes such as ultra-fine grinding, precision grading, and surface treatment, it can improve the compatibility and surface bonding between the material and PC. While meeting the requirements of high flexural modulus (meeting the high rigidity requirements of 3C electronic product shells), the material can achieve a frosted effect directly after injection molding in a mirror mold.

[0052] The selected toughening agent is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer. It can significantly improve the impact resistance of resins and engineering plastics, while also exhibiting excellent heat aging resistance and hydrolysis resistance.

[0053] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant, which has the advantages of low addition amount and can achieve flame retardant requirements and fire resistance rating under ultra-thin thickness (≤1.0mm).

[0054] The selected anti-dripping agent is non-coated PTFE (pure powder), which has the characteristics of low addition amount and significant anti-dripping effect.

[0055] The selected antioxidants are a combination of hindered phenols and phosphites, which have a significant synergistic effect and are characterized by low addition amount and significant antioxidant and anti-yellowing effects.

[0056] The selected colorant is carbon black-based black sand coated with a flow dispersant material. The flow dispersant is Kao's EB-FF, accounting for 50%. This ensures that the carbon black can be dispersed and does not agglomerate, while having little impact on the performance of the resin material and causing less pollution to the experimental environment.

[0057] The selected processing machine is a twin-screw extruder with a processing temperature of 260–280℃.

[0058] When preparing this flame-retardant PC frosted composite material with both high recyclability and resistance to bending deformation, the corresponding mass parts of the components are weighed according to the above proportions. After the mixture of each component material is sheared and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the product.

[0059] Example 2

[0060] A flame-retardant PC frosted composite material with both high recyclability and resistance to flexural deformation comprises the following components in parts by weight: 83.4 parts PCR PC, 15 parts surface-modified talc, 0 parts toughening agent, 0.25 parts sulfonate flame retardant, 0.45 parts organosilicon flame retardant, 0.3 parts anti-dripping agent, 0.3 parts antioxidant, and 0.3 parts colorant.

[0061] The selected PC is recycled PC (PCR PC), which is a bisphenol A type linear polycarbonate synthesized using the phosgene method. The MI is 45 g / 10 min (300℃ / 1.2 Kg), the weight average molecular weight is between 49,000 and 50,000, and the molecular weight distribution is between 1.9 and 2.2.

[0062] The selected abrasive additive is surface-modified talc powder, which belongs to inorganic mineral powder additives. Its fineness is 2000 mesh or higher, and its diameter-to-thickness ratio is 5:1. After carefully selecting mineral raw materials and undergoing ultra-fine grinding, precision grading and surface treatment, it can improve the compatibility and surface bonding between the material and PC. While meeting the requirements of high flexural modulus (meeting the high rigidity requirements of 3C electronic product shells), the material can have a frosted effect directly after injection molding in a mirror mold.

[0063] The selected toughening agent is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer. It can significantly improve the impact resistance of resins and engineering plastics, while also exhibiting excellent heat aging resistance and hydrolysis resistance.

[0064] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant, which has the advantages of low addition amount and can achieve flame retardant requirements and fire resistance rating under ultra-thin thickness (≤1.0mm).

[0065] The selected anti-dripping agent is non-coated PTFE (pure powder), which has the characteristics of low addition amount and significant anti-dripping effect.

[0066] The selected antioxidants are a combination of hindered phenols and phosphites, which have a significant synergistic effect and are characterized by low addition amount and significant antioxidant and anti-yellowing effects.

[0067] The selected colorant is carbon black-based black sand coated with a flow dispersant material. The flow dispersant is Kao's EB-FF, accounting for 50%. This ensures that the carbon black can be dispersed and does not agglomerate, while having little impact on the performance of the resin material and causing less pollution to the experimental environment.

[0068] The selected processing machine is a twin-screw extruder with a processing temperature of 260–280℃.

[0069] When preparing this flame-retardant PC frosted composite material with both high recyclability and resistance to bending deformation, the corresponding mass parts of the components are weighed according to the above proportions. After the mixture of each component material is sheared and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the product.

[0070] Example 3

[0071] A flame-retardant PC frosted composite material with both high recyclability and resistance to flexural deformation comprises the following components in parts by weight: 78.4 parts PCR PC, 20 parts surface-modified talc, 0 parts toughening agent, 0.25 parts sulfonate flame retardant, 0.45 parts organosilicon flame retardant, 0.3 parts anti-dripping agent, 0.3 parts antioxidant, and 0.3 parts colorant.

[0072] The selected PC is recycled PC (PCR PC), which is a bisphenol A type linear polycarbonate synthesized using the phosgene method. The MI is 45 g / 10 min (300℃ / 1.2 Kg), the weight average molecular weight is between 49,000 and 50,000, and the molecular weight distribution is between 1.9 and 2.2.

[0073] The selected abrasive additive is surface-modified talc powder, which belongs to inorganic mineral powder additives. Its fineness is 2000 mesh or higher, and its diameter-to-thickness ratio is 5:1. After carefully selecting mineral raw materials and undergoing ultra-fine grinding, precision grading and surface treatment, it can improve the compatibility and surface bonding between the material and PC. While meeting the requirements of high flexural modulus (meeting the high rigidity requirements of 3C electronic product shells), the material can have a frosted effect directly after injection molding in a mirror mold.

[0074] The selected toughening agent is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer. It can significantly improve the impact resistance of resins and engineering plastics, while also exhibiting excellent heat aging resistance and hydrolysis resistance.

[0075] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant, which has the advantages of low addition amount and can achieve flame retardant requirements and fire resistance rating under ultra-thin thickness (≤1.0mm).

[0076] The selected anti-dripping agent is non-coated PTFE (pure powder), which has the characteristics of low addition amount and significant anti-dripping effect.

[0077] The selected antioxidants are a combination of hindered phenols and phosphites, which have a significant synergistic effect and are characterized by low addition amount and significant antioxidant and anti-yellowing effects.

[0078] The selected colorant is carbon black-based black sand coated with a flow dispersant material. The flow dispersant is Kao's EB-FF, accounting for 50%. This ensures that the carbon black can be dispersed and does not agglomerate, while having little impact on the performance of the resin material and causing less pollution to the experimental environment.

[0079] The selected processing machine is a twin-screw extruder with a processing temperature of 260–280℃.

[0080] When preparing this flame-retardant PC frosted composite material with both high recyclability and resistance to bending deformation, the corresponding mass parts of the components are weighed according to the above proportions. After the mixture of each component material is sheared and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the product.

[0081] Example 4

[0082] A flame-retardant PC frosted composite material with both high recyclability and resistance to flexural deformation comprises the following components in parts by weight: 82.4 parts PCR PC, 15 parts surface-modified talc, 1 part toughening agent, 0.25 parts sulfonate flame retardant, 0.45 parts organosilicon flame retardant, 0.3 parts anti-dripping agent, 0.3 parts antioxidant, and 0.3 parts colorant.

[0083] The selected PC is recycled PC (PCR PC), which is a bisphenol A type linear polycarbonate synthesized using the phosgene method. The MI is 45 g / 10 min (300℃ / 1.2 Kg), the weight average molecular weight is between 49,000 and 50,000, and the molecular weight distribution is between 1.9 and 2.2.

[0084] The selected abrasive additive is surface-modified talc powder, which belongs to inorganic mineral powder additives. Its fineness is 2000 mesh or higher, and its diameter-to-thickness ratio is 5:1. After carefully selecting mineral raw materials and undergoing ultra-fine grinding, precision grading and surface treatment, it can improve the compatibility and surface bonding between the material and PC. While meeting the requirements of high flexural modulus (meeting the high rigidity requirements of 3C electronic product shells), the material can have a frosted effect directly after injection molding in a mirror mold.

[0085] The selected toughening agent is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer. It can significantly improve the impact resistance of resins and engineering plastics, while also exhibiting excellent heat aging resistance and hydrolysis resistance.

[0086] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant, which has the advantages of low addition amount and can achieve flame retardant requirements and fire resistance rating under ultra-thin thickness (≤1.0mm).

[0087] The selected anti-dripping agent is non-coated PTFE (pure powder), which has the characteristics of low addition amount and significant anti-dripping effect.

[0088] The selected antioxidants are a combination of hindered phenols and phosphites, which have a significant synergistic effect and are characterized by low addition amount and significant antioxidant and anti-yellowing effects.

[0089] The selected colorant is carbon black-based black sand coated with a flow dispersant material. The flow dispersant is Kao's EB-FF, accounting for 50%. This ensures that the carbon black can be dispersed and does not agglomerate, while having little impact on the performance of the resin material and causing less pollution to the experimental environment.

[0090] The selected processing machine is a twin-screw extruder with a processing temperature of 260–280℃.

[0091] When preparing this flame-retardant PC frosted composite material with both high recyclability and resistance to bending deformation, the corresponding mass parts of the components are weighed according to the above proportions. After the mixture of each component material is sheared and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the product.

[0092] Comparative Example 1

[0093] A flame-retardant PC frosted composite material with both high recyclability and resistance to flexural deformation comprises the following components in parts by weight: 98.4 parts PCR PC, 0 parts surface-modified talc, 0 parts toughening agent, 0.25 parts sulfonate flame retardant, 0.45 parts organosilicon flame retardant, 0.3 parts anti-dripping agent, 0.3 parts antioxidant, and 0.3 parts colorant.

[0094] The selected PC is recycled PC (PCR PC), which is a bisphenol A type linear polycarbonate synthesized using the phosgene method. The MI is 45 g / 10 min (300℃ / 1.2 Kg), the weight average molecular weight is between 49,000 and 50,000, and the molecular weight distribution is between 1.9 and 2.2.

[0095] The selected abrasive additive is surface-modified talc powder, which belongs to inorganic mineral powder additives. Its fineness is 2000 mesh or higher, and its diameter-to-thickness ratio is 5:1. After carefully selecting mineral raw materials and undergoing ultra-fine grinding, precision grading and surface treatment, it can improve the compatibility and surface bonding between the material and PC. While meeting the requirements of high flexural modulus (meeting the high rigidity requirements of 3C electronic product shells), the material can have a frosted effect directly after injection molding in a mirror mold.

[0096] The selected toughening agent is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer. It can significantly improve the impact resistance of resins and engineering plastics, while also exhibiting excellent heat aging resistance and hydrolysis resistance.

[0097] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant, which has the advantages of low addition amount and can achieve flame retardant requirements and fire resistance rating under ultra-thin thickness (≤1.0mm).

[0098] The selected anti-dripping agent is non-coated PTFE (pure powder), which has the characteristics of low addition amount and significant anti-dripping effect.

[0099] The selected antioxidants are a combination of hindered phenols and phosphites, which have a significant synergistic effect and are characterized by low addition amount and significant antioxidant and anti-yellowing effects.

[0100] The selected colorant is carbon black-based black sand coated with a flow dispersant material. The flow dispersant is Kao's EB-FF, accounting for 50%. This ensures that the carbon black can be dispersed and does not agglomerate, while having little impact on the performance of the resin material and causing less pollution to the experimental environment.

[0101] The selected processing machine is a twin-screw extruder with a processing temperature of 260–280℃.

[0102] When preparing this flame-retardant PC frosted composite material with both high recyclability and resistance to bending deformation, the corresponding mass parts of the components are weighed according to the above proportions. After the mixture of each component material is sheared and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the product.

[0103] After implementation, the above embodiments and comparative examples were reproduced with the same components. Examples 1, 2, 3, 4, and Comparative Example 1 were melt-extruded and granulated. Then, the particles from each embodiment and comparative example were injection molded into standard test strips on an injection molding machine. The mechanical properties of the materials were tested according to standards, and the test results are shown in Table 1.

[0104] Table 1 Test Results

[0105]

[0106]

[0107] The test results of Examples 1, 2, 3, 4 and Comparative Example 1 show that the present invention uses PC and a sanding agent to prepare a flame-retardant PC sanding composite material with both high recycling ratio and resistance to bending deformation.

[0108] The beneficial effects of this invention are:

[0109] 1. The PC used in this invention is recycled PC (PCR PC), which comes from everyday production and life, such as drinking water bottles, CDs, etc. This not only reduces carbon dioxide emissions, but also reduces energy consumption.

[0110] 2. The abrasive agent selected in this invention is surface-modified talc powder. After addition, it can improve the compatibility and surface bonding force with PC. Under the condition of meeting the high flexural modulus (meeting the high rigidity requirement of 3C electronic product shells), the material and product can have a frosted effect without the need for pre-treatment of the injection mold.

[0111] 3. The flame retardants used in this invention are all halogen-free and phosphorus-free additives, which are environmentally friendly materials that comply with and meet national and international regulations and will not cause secondary pollution to the environment. They are characterized by low addition amount and significant flame retardant effect. Furthermore, through combination and formulation, flame retardant requirements and fire resistance ratings can be achieved in systems containing PC, toughening materials and inorganic minerals with ultra-thin thicknesses (≤1.0mm).

[0112] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation, characterized in that: The composition comprises the following components in parts by weight: PC, 70-99.25 parts by mass; Scrub auxiliary agent, 0.5 to 20 parts by weight; Toughening agent, 0 to 10 parts by mass; Flame retardant, 0.1 to 5 parts by mass; Anti-dripping agent, 0.05 to 2 parts by mass; Antioxidant, 0.05-2 parts by mass; Colorant: 0.05 to 2 parts by mass.

2. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The selected polycarbonate is one or more of bisphenol A polycarbonate, polyester polycarbonate, silicone copolymer PC, cyclohexane bisphenol A polycarbonate, and high temperature resistant polycarbonate synthesized from bisphenol TMC. The melt mass flow rate MI of PC is between (10 and 70) g / 10min (300°C / 1.2kg), the weight average molecular weight is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.

6. It can be new material PC or recycled material PC (PCR PC).

3. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The selected grinding auxiliary agent can be a compound of one or more of inorganic auxiliary agents, organic auxiliary agents, polymer auxiliary agents, etc. and their derivatives.

4. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The toughening agent selected can be a compound or use of one or more of unsaturated rubber, saturated rubber, silicone rubber, styrene thermoplastic elastomer, polyurethane thermoplastic elastomer, high-density polyethylene (HDPE), polyolefin thermoplastic elastomer, polyamide thermoplastic elastomer, high rubber powder, acrylic copolymer (ACR), etc. and their derivatives.

5. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The flame retardant selected can be a combination of one or more of hypophosphite flame retardants, phosphate flame retardants, sulfonate flame retardants, silicone flame retardants, etc. and their derivatives.

6. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The selected anti-dripping agent is a fluorine-based PTFE material, including a core-shell coated PTFE material and a non-coated PTFE (pure powder type) material.

7. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The antioxidant selected can be a combination of one or more of hindered phenols, phosphites, thio antioxidants, etc.

8. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The selected colorants can be classified according to their ingredients, and can be a compound and use of one or more of pure carbon black type, oil black type, dye type, manganese iron black type, chrome copper black type, carriers with different types (lubricant powder, resin powder, etc.) and dispersants, etc. The above colorants can be in the form of a compound and use of one or more of pure powder type, color sand type, masterbatch type, etc.

9. The flame-retardant PC frosted composite material with high recycling ratio and resistance to bending deformation as claimed in claim 1, characterized in that: The processing machine selected is a twin-screw extruder, and the processing temperature is 260-280°C.

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