Halogen-free flame-retardant multi-color Anti-static PC composite material having high fluidity

Abstract

The present invention provides a halogen-free flame-retardant multi-color anti-static PC composite material having high fluidity. The composite material comprises the following components in parts by weight: 70-93.4 parts of polycarbonate (PC), 1-10 parts of a toughening agent, 0.5-10 parts of an anti-static agent, 5-20 parts of a flame retardant, 0.05-2 parts of an anti-dripping agent, and 0.05-2 parts of an antioxidant. The present invention has the following beneficial effects: the composite material of the present invention does not contain any dangerous halogen compounds, and therefore the risk of secondary pollution during the recycling thereof can be reduced, environmental protection is achieved, and the anti-static ability of the composite material is improved; moreover, the color can be customized on the basis of product requirements, thereby meeting the market demand for colorful products; and the composite material has good flame retardancy and fluidity.

Description

High-fluidity halogen-free flame-retardant multi-color anti-static PC composite material TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, and particularly relates to a high-fluidity halogen-free flame-retardant multi-color anti-static PC composite material. BACKGROUND

[0002] Static electricity is a common problem in the processing, operation and transportation of plastic products. In some specific industries (such as semiconductor, electronics factory, chemical factory), static electricity can have a great adverse effect on products and equipment, and even endanger property and life safety, which needs to be strictly paid attention to. Therefore, in specific industries, relevant plastic products are required to have certain anti-static function, and corresponding anti-static measures need to be taken.

[0003] Different industries and occasions require different anti-static levels, and the anti-static level refers to the conductive performance of the plastic product, which is usually represented by resistance (Ω). Generally, the volume resistivity of natural plastic material is between 10^12 and 10^18 Ω·cm, which is also called general plastic. When the resistance is lower than 10^9 Ω·cm, it is called anti-static plastic. When the resistance is lower than 10^6 Ω·cm, it can be called conductive plastic. The anti-static level of plastic products can be improved by the following methods:

[0004] By adding conductive agents or anti-static agents during the preparation of plastic products, the corresponding anti-static or anti-static level can be achieved.

[0005] Change the structure of the plastic material, that is, change the structure of the original plastic material to reduce its resistivity and achieve the corresponding anti-static effect.

[0006] Surface treatment method, that is, a conductive substance or film is coated on the surface of the plastic material to increase the conductive performance of the material. Although this treatment method has relatively low cost, the effect is not satisfactory.

[0007] In terms of comprehensive effect, cost and implementation difficulty, adding conductive agents or anti-static agents is the best method.

[0008] PC (polycarbonate) material is an engineering plastic with excellent comprehensive performance (mechanical properties, dimensional stability, toughness, heat resistance, ultraviolet (UV) resistance and electrical properties). The flame retardant performance of PC itself is UL94 V-2 level, and the volume resistivity is about 10^16 Ω·cm, without anti-static and conductive functions, which cannot be used in some specific industries and products. Although the traditional conductive materials such as carbon nanotubes, carbon black and graphene have the advantage of small addition amount, the inorganic properties will affect the other properties of the plastic material. At the same time, the addition of the above traditional conductive materials will make the finished product only present black color, which cannot meet the market demand for colorful products and cannot meet the corresponding flame retardant demand.

[0009] Therefore, the present application provides a high-flow halogen-free flame-retardant colorful anti-static PC composite material to solve the above problems. SUMMARY

[0010] In order to solve the problem that the traditional conductive materials such as carbon nanotubes, carbon black and graphene are generally added to improve the anti-static performance of PC products, which can only present black appearance and cannot meet the market demand for colorful PC products, and can affect the flame retardant performance of PC products, the present application provides a high-flow halogen-free flame-retardant colorful anti-static PC composite material to solve the above problems.

[0011] The technical problem of the present application is solved by a high-flow halogen-free flame-retardant colorful anti-static PC composite material, which comprises the following components by weight:

[0012] Polycarbonate (PC), 70~93.4 parts;

[0013] Toughening agent, 1~10 parts;

[0014] Antistatic agent, 0.5~10 parts;

[0015] Flame retardant, 5~20 parts;

[0016] Anti-dripping agent, 0.05~2 parts;

[0017] Antioxidant, 0.05~2 parts.

[0018] Preferably, the polycarbonate is one or more of the following: bisphenol A type polycarbonate, polyester type polycarbonate, organic silicon copolymer type polycarbonate, cyclohexane bisphenol A type polycarbonate, bisphenol TMC synthesized polycarbonate, the melt mass flow rate MI of the polycarbonate is (10~70) g / 10min (300℃ / 1.2Kg), the weight average molecular weight is 20000~50000, and the molecular weight distribution is 1~2.5.

[0019] Preferably, the polycarbonate is selected from recycled polycarbonate (PCR PC).

[0020] Preferably, the toughening agent is one or more of a combination of unsaturated rubber-based toughening agent, saturated rubber-based toughening agent, styrene-based thermoplastic elastomer toughening agent, polyurethane-based thermoplastic elastomer toughening agent, polyolefin-based thermoplastic elastomer toughening agent, polyamide-based thermoplastic elastomer toughening agent, high-gel powder-based toughening agent, acrylate copolymer and their derivatives.

[0021] Preferably, the unsaturated rubber-based toughening agent includes nitrile rubber (NBR), natural rubber (NR), styrene-butadiene rubber (SBR), cis-butadiene rubber (BR); the saturated rubber-based toughening agent includes butyl rubber (IIR), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), halogenated butyl rubber; the styrene-based thermoplastic elastomer toughening agent includes methyl methacrylate-butadiene-styrene terpolymer (MBS), styrene-butadiene-styrene copolymer (SBS), hydrogenated SBS (SEBS), styrene-isoprene-styrene (SIS); the polyolefin-based thermoplastic elastomer toughening agent includes chlorinated polyethylene (CPE), ethylene-octene copolymer (POE), thermoplastic dynamic vulcanization rubber (TPV), ethylene-vinyl acetate copolymer (EVA).

[0022] Preferably, the antistatic agent is one or a combination of solid antistatic material and liquid antistatic material, and the antistatic agent is used to improve the antistatic ability of the composite material and change the color of the composite material.

[0023] Preferably, the solid antistatic material includes carbon nanotubes, carbon black, graphene, and the liquid antistatic material includes polyacetylene (PA) and its derivatives, polypyrrole (PPY) and its derivatives, polythiophene (PTH) and its derivatives, poly-p-phenylene vinylene (PPV) and its derivatives, polyaniline (PANI) and its derivatives.

[0024] Preferably, the flame retardant is one or more of a combination of hypophosphite-based flame retardant, phosphate-based flame retardant, sulfonate-based flame retardant, or organosilicon-based flame retardant.

[0025] Preferably, the hypophosphite flame retardant includes vinyl aluminum hypophosphite, vinyl hypophosphite; the phosphate flame retardant includes 1,3 phenylene phosphoric acid (2,6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivatives (BDP), tetraphenyl resorcinol diphosphate and its derivatives (RDP), triphenyl phosphate (TPP); the sulfonate flame retardant includes benzenesulfonyl potassium benzenesulfonate (KSS), potassium perfluorobutyl sulfonate (PPFBS), sodium 2,4,5-trichlorobenzenesulfonate (STB); the silicone flame retardant includes polysilaborane and its derivatives, cross-linked polydimethylsiloxane (PDMS) and its derivatives.

[0026] Preferably, the anti-dripping agent is a fluorine-based polytetrafluoroethylene (PTFE) material, including core-shell coated polytetrafluoroethylene (PTFE) and non-coated polytetrafluoroethylene (PTFE).

[0027] Preferably, the antioxidant is one or a combination of two of a hindered phenolic antioxidant, a phosphite antioxidant or a thio antioxidant.

[0028] Preferably, the hindered phenolic antioxidant includes (β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate; the phosphite antioxidant includes tris (2,4-di-tert-butylphenyl) phosphite, dioctadecyl alcohol pentaerythritol diphosphite.

[0029] A preparation method of a high-flow halogen-free flame-retardant multi-color anti-static PC composite material, characterized in that: after the components are uniformly mixed, they are put into an extruder for extrusion granulation, the extruder is a double-screw extruder, the processing temperature range of the extruder is set to 210-230 DEG C, and the screw rotation speed of the extruder is 400-600 RPM.

[0030] The composite material of the present application does not contain hazardous halogen compounds, which can reduce the risk of secondary pollution during recycling, is more environmentally friendly, improves the anti-static ability of the composite material, and can customize the color according to product requirements, meet the market demand for multi-color products, and make the prepared composite material have good flame retardance and flowability. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical means adopted by the present application and its effects, the following describes the embodiments of the present application in detail in combination with the drawings thereof.

[0032] The present application provides a high-flow halogen-free flame-retardant multi-color anti-static PC composite material, which comprises the following components by weight:

[0033] Polycarbonate (PC), 70-93.4 parts;

[0034] Toughening agent, 1-10 parts;

[0035] Antistatic agent, 0.5-10 parts;

[0036] Flame retardant, 5-20 parts;

[0037] Anti-dripping agent, 0.05-2 parts;

[0038] Antioxidant, 0.05-2 parts.

[0039] The polycarbonate is one or more of bisphenol A polycarbonate, polyester polycarbonate, organic silicon copolymer polycarbonate, cyclohexane bisphenol A polycarbonate, bisphenol TMC synthetic polycarbonate, the melt mass flow rate MI of the polycarbonate is (10-70) g / 10 min (300℃ / 1.2Kg), the weight average molecular weight is 20000-50000, and the molecular weight distribution is 1-2.5.

[0040] The polycarbonate is selected from recycled polycarbonate (PCR PC).

[0041] The recycled polycarbonate (PCR PC) includes daily necessities (mineral water bucket, record, optical disc, milk bottle) collected, sorted, broken, washed, sorted, automobile industry (car light, instrument panel), electric power and electrical equipment (ammeter shell, ammeter box, electrical appliance shell), building materials (solar panel, hollow board).

[0042] The toughening agent is one or more of unsaturated rubber toughening agent, saturated rubber toughening agent, styrene thermoplastic elastomer toughening agent, polyurethane thermoplastic elastomer toughening agent, polyolefin thermoplastic elastomer toughening agent, polyamide thermoplastic elastomer toughening agent, high glue powder toughening agent, acrylate copolymer and their derivatives.

[0043] The unsaturated rubber toughening agent includes nitrile rubber (NBR), natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR); the saturated rubber toughening agent includes butyl rubber (IIR), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), halogenated butyl rubber; the styrene thermoplastic elastomer toughening agent includes methyl methacrylate-butadiene-styrene terpolymer (MBS), styrene-butadiene-styrene copolymer (SBS), hydrogenated SBS (SEBS), styrene-isoprene-styrene (SIS); the polyolefin thermoplastic elastomer toughening agent includes chlorinated polyethylene (CPE), ethylene-octene copolymer (POE), thermoplastic dynamic vulcanization (TPV), ethylene-vinyl acetate copolymer (EVA).

[0044] The antistatic agent is one or a combination of solid antistatic material and liquid antistatic material, and is used to improve the antistatic ability of the composite material and change the color of the composite material.

[0045] The solid antistatic material includes carbon nanotubes, carbon black and graphene, and the liquid antistatic material includes polyacetylene (PA) and its derivatives, polypyrrole (PPY) and its derivatives, polythiophene (PTH) and its derivatives, poly-p-phenylene vinylene (PPV) and its derivatives, and polyaniline (PANI) and its derivatives.

[0046] The flame retardant is one or a combination of hypophosphite-based flame retardant, phosphate-based flame retardant, sulfonate-based flame retardant or organosilicon-based flame retardant.

[0047] The hypophosphite-based flame retardant includes vinyl aluminum hypophosphite and vinyl hypophosphoric acid, the phosphate-based flame retardant includes 1,3-phenylene phosphoric acid (2,6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivatives (BDP), tetraphenyl resorcinol diphosphate and its derivatives (RDP), and triphenyl phosphate (TPP), the sulfonate-based flame retardant includes benzenesulfonyl potassium benzenesulfonate (KSS), potassium perfluorobutyl sulfonate (PPFBS), and 2,4,5-trichlorobenzenesulfonic acid sodium (STB), and the organosilicon-based flame retardant includes polysilaborane and its derivatives, and cross-linked polydimethylsiloxane (PDMS) and its derivatives.

[0048] The anti-dripping agent is fluorine-based polytetrafluoroethylene (PTFE) material, including core-shell coated polytetrafluoroethylene (PTFE) and non-coated polytetrafluoroethylene (PTFE).

[0049] The antioxidant is one or a combination of hindered phenolic antioxidant, phosphite antioxidant or thio antioxidant.

[0050] The hindered phenolic antioxidant includes (β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, the phosphite antioxidant includes tris(2,4-di-tert-butylphenyl) phosphite and dioctadecyl alcohol pentaerythritol diphosphite.

[0051] The application also provides a preparation method of the high-fluidity halogen-free flame-retardant multi-color anti-static PC composite material.

[0052] Comparative Example 1

[0053] A PC composite material, comprising the following components by weight: 87.25 parts of polycarbonate (PC), 5 parts of toughening agent, 7.3 parts of flame retardant, 0.15 parts of anti-dripping agent, 0.3 parts of antioxidant.

[0054] The polycarbonate (PC) is recycled polycarbonate (PCR PC), and CD-175 type PCR PC from Guopu is selected, with a melt mass flow rate MI = 50 g / 10 min (300℃ / 1.2Kg), a weight average molecular weight of 49000~50000, and a molecular weight distribution of 1.8~2.0.

[0055] The toughening agent is a styrene-based thermoplastic elastomer, specifically methyl methacrylate-butadiene-styrene terpolymer (MBS).

[0056] The 7.3 parts of flame retardant are a compound of 0.3 parts of sulfonate-based flame retardant and 7 parts of phosphate-based flame retardant, the sulfonate-based flame retardant is potassium benzenesulfonyl benzenesulfonate (KSS), and the phosphate-based flame retardant is bisphenol A bis(diphenyl phosphate) (BDP), a derivative of tetraphenyl bisphenol A diphosphate.

[0057] The anti-dripping agent is a non-coated polytetrafluoroethylene (PTFE).

[0058] The 0.3 parts of antioxidant are a compound of 0.24 parts of hindered phenolic antioxidant and 0.06 parts of phosphite antioxidant, the hindered phenolic antioxidant is β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, and the phosphite antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0059] The PC composite material is prepared by weighing the components according to the above ratio, mixing the components uniformly, and then feeding the mixture into an extruder. The mixture of the components is sheared, mixed, and transported by the screw of the extruder, fully melted and compounded, then extruded through the die of the head, drawn, cooled, and pelletized to obtain finished particles. The extruder is a double-screw extruder, the processing temperature range of the extruder is set to 210℃~230℃, and the screw speed of the extruder is 400~600RPM.

[0060] Example 1

[0061] A high-flow halogen-free flame-retardant multi-color anti-static PC composite material, comprising the following components by weight: 86.75 parts of polycarbonate (PC), 5 parts of toughening agent, 0.5 parts of anti-static agent, 7.3 parts of flame retardant, 0.15 parts of anti-dripping agent, and 0.3 parts of antioxidant.

[0062] The polycarbonate (PC) is a recycled polycarbonate (PCR PC), and CD-175 type PCR PC from Guopu is selected, with a melt mass flow rate MI = 50 g / 10 min (300℃ / 1.2Kg), a weight average molecular weight of 49000~50000, and a molecular weight distribution of 1.8~2.0.

[0063] The toughening agent is a styrene-based thermoplastic elastomer, specifically methyl methacrylate-butadiene-styrene terpolymer (MBS).

[0064] The antistatic agent is poly(3,4-ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS) composed of polythiophene (PTH) derivative and poly-p-phenylene vinylene (PPV) derivative, and has a blue appearance.

[0065] The 7.3 parts of the flame retardant are a combination of 0.3 parts of a sulfonate-based flame retardant, which is potassium benzenesulfonyl benzenesulfonate (KSS), and 7 parts of a phosphate-based flame retardant, which is bisphenol A bis(diphenyl phosphate) (BDP).

[0066] The anti-dripping agent is non-coated polytetrafluoroethylene (PTFE).

[0067] The 0.3 parts of the antioxidant are a combination of 0.24 parts of a hindered phenolic antioxidant, which is β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, and 0.06 parts of a phosphite antioxidant, which is tris(2,4-di-tert-butylphenyl) phosphite.

[0068] To prepare the high-flow halogen-free flame-retardant multi-color antistatic PC composite material, the components are weighed according to the above-mentioned proportions, and then mixed uniformly and fed into an extruder. The mixture of the components is sheared, mixed and transported by the screw of the extruder, fully melted and compounded, then extruded through the die of the head, drawn, cooled and pelletized, and finally the finished particles with a blue appearance are obtained. The extruder is a double-screw extruder, the processing temperature range of the extruder is set to 210℃~230℃, and the screw speed of the extruder is 400~600 RPM.

[0069] Comparative Example 2

[0070] A high-flow halogen-free flame-retardant multi-color antistatic PC composite material includes the following components by weight: 85.55 parts of polycarbonate (PC), 5 parts of toughening agent, 2 parts of antistatic agent, 7 parts of flame retardant, 0.15 parts of anti-dripping agent, and 0.3 parts of antioxidant.

[0071] The polycarbonate (PC) is recycled polycarbonate (PCR PC), and CD-175 type PCR PC of Guopu is selected, the melt mass flow rate MI = 50 g / 10 min (300℃ / 1.2Kg), the weight average molecular weight is 49000~50000, and the molecular weight distribution is 1.8~2.0.

[0072] The toughening agent is a styrene-based thermoplastic elastomer, specifically methyl methacrylate-butadiene-styrene terpolymer (MBS).

[0073] The antistatic agent is poly (3, 4 ethylenedioxythiophene) : poly (styrene sulfonic acid) (PEDOT: PSS) composed of polythiophene (PTH) derivative and poly-p-phenylene vinylene (PPV) derivative, and the appearance is blue liquid.

[0074] The 7 parts of the flame retardant are phosphate ester flame retardants, and bisphenol A bis (diphenyl phosphate) (BDP) is selected as a derivative of tetraphenyl bisphenol A diphosphate.

[0075] The anti-dripping agent is a non-coated polytetrafluoroethylene (PTFE).

[0076] The 0.3 parts of the antioxidant are a compound of 0.24 parts of a hindered phenolic antioxidant and 0.06 parts of a phosphite antioxidant, the hindered phenolic antioxidant is β-3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, and the phosphite antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite.

[0077] The high-flow halogen-free flame-retardant multi-color antistatic PC composite material is prepared, and the components are weighed according to the above-mentioned proportion, and then the mixture is put into an extruder. The mixture of the components is sheared, mixed and transported by the screw of the extruder, fully melted and compounded, then extruded by the die of the head, drawn, cooled and pelletized, and finally the finished particles with blue appearance are obtained. The extruder is a double-screw extruder, the processing temperature interval of the extruder is set to 210℃~230℃, and the screw speed of the extruder is 400~600 RPM.

[0078] Example 2

[0079] A high-flow halogen-free flame-retardant multi-color antistatic PC composite material comprises the following components in parts by weight: 85.25 parts of polycarbonate (PC), 5 parts of toughening agent, 2 parts of antistatic agent, 7.3 parts of flame retardant, 0.15 parts of anti-dripping agent, and 0.3 parts of antioxidant.

[0080] The polycarbonate (PC) is a recycled polycarbonate (PCR PC), and CD-175 type PCR PC from Guopu is selected, with a melt mass flow rate MI = 50 g / 10 min (300℃ / 1.2Kg), a weight average molecular weight of 49000~50000, and a molecular weight distribution of 1.8~2.0.

[0081] The toughening agent is a styrene-based thermoplastic elastomer, specifically methyl methacrylate-butadiene-styrene terpolymer (MBS).

[0082] The antistatic agent is poly(3,4-ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS) composed of polythiophene (PTH) derivative and poly-p-phenylene vinylene (PPV) derivative, and has a blue appearance.

[0083] The 7.3 parts of the flame retardant are a combination of 0.3 parts of a sulfonate-based flame retardant, which is potassium benzenesulfonyl benzenesulfonate (KSS), and 7 parts of a phosphate-based flame retardant, which is bisphenol A bis(diphenyl phosphate) (BDP).

[0084] The anti-dripping agent is non-coated polytetrafluoroethylene (PTFE).

[0085] The 0.3 parts of the antioxidant are a combination of 0.24 parts of a hindered phenolic antioxidant, which is β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, and 0.06 parts of a phosphite antioxidant, which is tris(2,4-di-tert-butylphenyl) phosphite.

[0086] To prepare the high-flow halogen-free flame-retardant multi-color antistatic PC composite material, the components are weighed according to the above-mentioned proportions, and then mixed uniformly and fed into an extruder. The mixture of the components is sheared, mixed, and transported by the screw of the extruder, fully melted and compounded, then extruded through the die of the head, drawn, cooled, and pelletized to obtain the finished particles with a blue appearance. The extruder is a double-screw extruder, the processing temperature range of the extruder is set to 210℃~230℃, and the screw speed of the extruder is 400~600 RPM.

[0087] Comparative Example 3

[0088] A high-flow halogen-free flame-retardant multi-color antistatic PC composite material includes the following components by weight: 83.55 parts of polycarbonate (PC), 5 parts of toughening agent, 4 parts of antistatic agent, 7 parts of flame retardant, 0.15 parts of anti-dripping agent, and 0.3 parts of antioxidant.

[0089] The polycarbonate (PC) is recycled polycarbonate (PCR PC), and CD-175 type PCR PC from Guopu is selected, with a melt mass flow rate MI = 50 g / 10 min (300℃ / 1.2Kg), a weight average molecular weight of 49000~50000, and a molecular weight distribution of 1.8~2.0.

[0090] The toughening agent is a styrene-based thermoplastic elastomer, specifically methyl methacrylate-butadiene-styrene terpolymer (MBS).

[0091] The antistatic agent is poly(3,4 ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT: PSS) composed of polythiophene (PTH) derivative and poly-p-phenylene vinylene (PPV) derivative, and has a blue appearance.

[0092] The 7 parts of the flame retardant are phosphate ester flame retardants, and bisphenol A bis(diphenyl phosphate) (BDP) is selected as a derivative of tetraphenyl bisphenol A diphosphate.

[0093] The anti-dripping agent is a non-coated polytetrafluoroethylene (PTFE).

[0094] The 0.3 parts of the antioxidant are a combination of 0.24 parts of a hindered phenolic antioxidant and 0.06 parts of a phosphite antioxidant, the hindered phenolic antioxidant is β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, and the phosphite antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0095] To prepare the high-flow halogen-free flame-retardant multi-color antistatic PC composite material, the components are weighed according to the above-mentioned ratio, and the mixture of the components is fully melted and compounded after being sheared, mixed and transported by the screw of the extruder, and then extruded, drawn, cooled and cut into particles by the die of the head. Finally, the finished particles with a blue appearance are obtained. The extruder is a double-screw extruder, the processing temperature interval of the extruder is set to 210℃~230℃, and the screw speed of the extruder is 400~600 RPM.

[0096] Example 3

[0097] A high-flow halogen-free flame-retardant multi-color antistatic PC composite material includes the following components by weight: 83.25 parts of polycarbonate (PC), 5 parts of toughening agent, 4 parts of antistatic agent, 7.3 parts of flame retardant, 0.15 parts of anti-dripping agent, and 0.3 parts of antioxidant.

[0098] The polycarbonate (PC) is recycled polycarbonate (PCR PC), and CD-175 type PCR PC of Guopu is selected, the melt mass flow rate MI = 50 g / 10 min (300℃ / 1.2Kg), the weight average molecular weight is 49000~50000, and the molecular weight distribution is 1.8~2.0.

[0099] The toughening agent is a styrene-based thermoplastic elastomer, specifically methyl methacrylate-butadiene-styrene terpolymer (MBS).

[0100] The antistatic agent is poly(3,4-ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT: PSS) composed of polythiophene (PTH) derivative and poly-p-phenylene vinylene (PPV) derivative, and the appearance is blue liquid.

[0101] The 7.3 parts of the flame retardant are 0.3 parts of a sulfonate-based flame retardant and 7 parts of a phosphate-based flame retardant, the sulfonate-based flame retardant is potassium benzenesulfonyl benzenesulfonate (KSS), and the phosphate-based flame retardant is bisphenol A bis(diphenyl phosphate) (BDP) which is a derivative of tetraphenyl bisphenol A diphosphate.

[0102] The anti-dripping agent is non-coated polytetrafluoroethylene (PTFE).

[0103] The 0.3 parts of the antioxidant are a compound of 0.24 parts of a hindered phenolic antioxidant and 0.06 parts of a phosphite antioxidant, the hindered phenolic antioxidant is β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate, and the phosphite antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0104] The high-flow halogen-free flame-retardant multi-color antistatic PC composite material is prepared, the components are weighed according to the above-mentioned proportion, the components are uniformly mixed and then put into an extruder, the mixture of the components is sheared, mixed and transported by the screw of the extruder, fully melted and compounded, then extruded, drawn, cooled and pelletized by the die of the head, and finally the finished particles with blue appearance are obtained, the extruder is a double-screw extruder, the processing temperature interval of the extruder is set to 210℃~230℃, and the screw rotation speed of the extruder is 400~600 RPM.

[0105] The particles in the above-mentioned comparative example 1, example 1, comparative example 2, example 2, comparative example 3 and example 3 are injection molded into standard test bars on an injection molding machine, and the related full physical properties and volume resistivity of the test bars are tested according to the standard, and the test results are shown in table 1:

[0106] Table 1 Test results

[0107]

[0108] From the test results above, it can be seen that the present application realizes the preparation of a high-flow halogen-free flame-retardant multi-color antistatic PC composite material by adding a toughening agent, an antistatic agent, a flame retardant, an anti-dripping agent and an antioxidant in polycarbonate (PC), and the prepared composite material has the following advantages: no dangerous halogen compounds, reduced risk of secondary pollution during recycling and reuse, more environmentally friendly, improved antistatic ability of the composite material, and the color can be customized according to product requirements to meet the market demand for multi-color products. By adding the flame retardant compounded from a sulfonate flame retardant and a phosphate ester flame retardant, the adverse effects of small molecule liquid antistatic materials on the flame retardance of the composite material can be improved, and compared with the use of a phosphate ester flame retardant alone, the composite material can maintain good flame retardance and flowability.

[0109] It should be pointed out that the present application is not limited to the above-mentioned embodiments, and any simple modification, equivalent change and modification of the above-mentioned embodiments based on the technical scheme of the present application by any person skilled in the art fall within the protection scope of the present application.

Claims

1. A high flow halogen-free flame-retardant multi-color antistatic PC composite material, characterized in that, The components include the following weight parts: Polycarbonate, 70~93.4 parts; Toughening agent, 1~10 parts; Antistatic agent, 0.5~10 parts; Flame retardant, 5~20 parts; Anti-dripping agent, 0.05~2 parts; Antioxidant, 0.05~2 parts.

2. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 1, wherein: The polycarbonate is one or more of bisphenol A polycarbonate, polyester polycarbonate, organosilicon copolymer polycarbonate, cyclohexane bisphenol A polycarbonate, and bisphenol TMC synthetic polycarbonate, the melt mass flow rate of the polycarbonate is (10~70) g / 10 min (300℃ / 1.2Kg), the weight average molecular weight is 20000~50000, and the molecular weight distribution is 1~2.

5.

3. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 1, wherein: The polycarbonate is recycled polycarbonate.

4. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 1, wherein: The toughening agent is one or more of unsaturated rubber-based toughening agent, saturated rubber-based toughening agent, styrene-based thermoplastic elastomer toughening agent, polyurethane-based thermoplastic elastomer toughening agent, polyolefin-based thermoplastic elastomer toughening agent, polyamide-based thermoplastic elastomer toughening agent, high glue powder-based toughening agent, acrylate copolymer and their derivatives.

5. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 4, wherein: The unsaturated rubber-based toughening agent includes nitrile rubber, natural rubber, styrene-butadiene rubber, and cis-butadiene rubber; the saturated rubber-based toughening agent includes butyl rubber, ethylene-propylene rubber, ternary ethylene-propylene rubber, and halogenated butyl rubber; the styrene-based thermoplastic elastomer toughening agent includes methyl methacrylate-butadiene-styrene terpolymer, styrene-butadiene-styrene copolymer, hydrogenated SBS, and styrene-isoprene-styrene; and the polyolefin-based thermoplastic elastomer toughening agent includes chlorinated polyethylene, ethylene-octene copolymer, thermoplastic dynamic vulcanized rubber, and ethylene-vinyl acetate copolymer.

6. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 1, wherein: The antistatic agent is one or a combination of solid antistatic material and liquid antistatic material, and the antistatic agent is used to improve the antistatic ability of the composite material and change the color of the composite material.

7. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 6, wherein: The solid antistatic material includes carbon nanotubes, carbon black, and graphene, and the liquid antistatic material includes polyacetylene and its derivatives, polypyrrole and its derivatives, polythiophene and its derivatives, poly-p-phenylenevinylene and its derivatives, and polyaniline and its derivatives.

8. The high-flow halogen-free flame-retardant multi-color antistatic PC composite material of claim 1, wherein: The flame retardant is one or more of hypophosphite-based flame retardant, phosphate-based flame retardant, sulfonate-based flame retardant or organosilicon-based flame retardant. 9.The halogen-free flame-retardant multi-color anti-static PC composite material with high fluidity according to claim 8, wherein: The hypophosphite-based flame retardant includes vinyl aluminum hypophosphite and vinyl hypophosphite; the phosphate-based flame retardant includes 1, 3 phenylene phosphoric acid (2, 6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivatives, tetraphenyl resorcinol diphosphate and its derivatives, and triphenyl phosphate; the sulfonate-based flame retardant includes benzene sulfonyl potassium benzenesulfonate, potassium perfluorobutyl sulfonate, and sodium 2, 4, 5-trichlorobenzenesulfonate; and the organosilicon-based flame retardant includes polysilaborane and its derivatives, and cross-linked polydimethylsiloxane and its derivatives. 10.The halogen-free flame-retardant multi-color anti-static PC composite material with high fluidity according to claim 1, wherein: The anti-dripping agent is fluorine-based polytetrafluoroethylene material, including core-shell coated polytetrafluoroethylene and non-coated polytetrafluoroethylene. 11.The halogen-free flame-retardant multi-color anti-static PC composite material with high fluidity according to claim 1, wherein: The antioxidant is one or a combination of hindered phenolic antioxidant, phosphite antioxidant or thio antioxidant. 12.The halogen-free flame-retardant multi-color anti-static PC composite material with high fluidity according to claim 11, wherein: The hindered phenolic antioxidant includes (β-3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate; and the phosphite antioxidant includes tris (2, 4-di-tert-butylphenyl) phosphite and dioctadecyl alcohol pentaerythritol diphosphite. 13.A method for preparing the halogen-free flame-retardant multi-color anti-static PC composite material with high fluidity according to any one of claims 1-12, wherein: After the components are uniformly mixed, they are put into an extruder for extrusion granulation, the extruder is a double-screw extruder, the processing temperature range of the extruder is set to 210-230℃, and the screw rotation speed of the extruder is 400-600 RPM.