Polycarbonate composition and molded product

Abstract

The specific embodiment of the invention provides a polycarbonate composition and a molded product thereof, the polycarbonate composition comprises a polycarbonate resin as a component A and a polycarbonate-polyorganosiloxane copolymer as a component B, the total weight of the polycarbonate resin and the polycarbonate-polyorganosiloxane copolymer is 100, based on the total weight of the component A and the component B, the polyorganosiloxane accounts for 0.4-5.9 wt%, and the total weight of the component B and the component A accounts for 0.4-5.9 wt%. The mass percentage content of the polyorganosiloxane in the component C is Y%, the average particle diameter of the component C is Z nm, and Y and Z satisfy the following conditions: Y is greater than or equal to-Z / 10 + 70 (wherein Y is greater than or equal to 25, and 1000 is greater than or equal to Z is greater than or equal to 200); and 0.5-25 parts by weight of a phosphorus-based flame retardant as component D. The polycarbonate composition has the characteristics of low-temperature impact resistance, thin-wall flame retardance, light resistance and water resistance.

Description

[0001] This application claims the priority of a Chinese patent application titled "A Polycarbonate Composition and Molded Article" with an application number of 202311592247.2 and filed with the Chinese Patent Office on November 27, 2023. The entire content thereof is incorporated herein by reference. Technical Field

[0002] The present invention belongs to the field of polymer materials, and particularly relates to a polycarbonate composition and a molded article. Background Art

[0003] Polycarbonate resin (PC) is widely used in mechanical parts, automotive parts, electrical and electronic parts, office equipment parts, etc. due to its excellent properties such as mechanical strength, dimensional stability, and flame retardancy. When polycarbonate resin is used as a raw material for communication boxes, junction boxes for solar power generation, and enclosures for electric vehicle (EV) charging equipment, since the enclosures are usually large and used outdoors, they need to have good fluidity, thin-wall flame retardancy, and high impact resistance in the low-temperature environment in winter, and also require durability that is not easily deteriorated by ultraviolet rays or wind and rain. However, the existing polycarbonate resins cannot meet these requirements and need to be modified.

[0004] To improve the low-temperature impact characteristics and durability of carbonate resins, JPH00881620A and WO2011 / 1551490 propose a method of incorporating polytetrafluoroethylene particles or an organometallic salt flame retardant into a polycarbonate-polydiorganosiloxane copolymer. This method has deficiencies in the flame retardancy of thin-wall products or products after a water immersion test. WO2022 / 168454 proposes a method of incorporating a phosphazene compound and a fluorine-containing dripping inhibitor into a polycarbonate-polydiorganosiloxane copolymer with a specific viscosity-average molecular weight and a polycarbonate resin. In this method, due to the high viscosity-average molecular weight of the polycarbonate-polydiorganosiloxane copolymer, the fluidity is poor, and the low-temperature impact characteristics cannot be taken into account. JP2014058607A proposes a method of incorporating a polyorganosiloxane-grafted acrylic composite rubber into a polycarbonate-polyorganosiloxane copolymer having a specific organosiloxane repeating unit. This method has deficiencies in the flame retardancy of thin-wall products and the light and water impact resistance of the products needs to be further improved. Summary of the Invention

[0005] The specific embodiments of the present invention provide a flame-retardant polycarbonate composition and a molded article that better balance low-temperature impact characteristics and durability. The specific solutions are as follows:

[0006] A polycarbonate composition, comprising:

[0007] The total of the polycarbonate resin as Component A and the polycarbonate - polyorganosiloxane copolymer as Component B is 100 parts by weight. Among them, based on the total weight of Component A and Component B, the polyorganosiloxane accounts for 0.4 - 5.9 wt%;

[0008] 0.5 - 10 parts by weight of polyorganosiloxane - grafted copolymer rubber particles as Component C. Among them, the mass percentage of polyorganosiloxane in Component C is Y%, and the average particle size of Component C is Z nm. Y and Z satisfy the following conditions:

[0009] Y ≥ -Z / 10 + 70 (where Y ≥ 25 and 1000 ≥ Z ≥ 200);

[0010] 0.5 - 25 parts by weight of a phosphorus - based flame retardant as Component D.

[0011] Optionally, the polycarbonate of Component A and the polycarbonate part of Component B are each independently composed of structural units of the following formula (1):

[0012]

[0013] In the above formula (1), e R 1 and f R 2 are each independently selected from a hydrogen atom, a halogen atom, an alkyl group having 1 - 18 carbon atoms, an alkoxy group having 1 - 18 carbon atoms, a cycloalkyl group having 6 - 20 carbon atoms, a cycloalkoxy group having 6 - 20 carbon atoms, an alkenyl group having 2 - 10 carbon atoms, an aryl group having 6 - 14 carbon atoms, an aryloxy group having 6 - 14 carbon atoms, an aralkyl group having 7 - 20 carbon atoms, an aralkoxy group having 7 - 20 carbon atoms, a nitro group, an aldehyde group, a cyano group or a carboxyl group. e and f are each independently an integer from 1 to 4. W is selected from at least one group of a single bond or a group represented by the following general formula (2):

[0014]

[0015] In the above formula (2), g R 11 and R 12 、R 13 、R 14 、R 15 、R 16 、h R 17 and R 18 are each independently selected from a hydrogen atom, an alkyl group having 1 - 18 carbon atoms, an aryl group having 6 - 14 carbon atoms or an aralkyl group having 7 - 20 carbon atoms. R 19 and R 20Each independently is a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aralkoxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group or a carboxyl group, g is an integer from 1 to 10, and h is an integer from 4 to 7;

[0016] The polyorganosiloxane part in the component B is composed of structural units of the following formula (3):

[0017]

[0018] In the above formula (3), R3, R4, R5, R6, R7 and R8 are each independently selected from a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, and R9 and R10 are each independently selected from a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, p is a positive integer, q is 0 or a positive integer, the average chain length p + q is a natural number from 30 to 50, and X is a divalent aliphatic group having 2 to 8 carbon atoms.

[0019] Optionally, the viscosity average molecular weight of the polycarbonate is 15,000 to 30,000.

[0020] Optionally, the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 15,000 to 27,000.

[0021] Optionally, the polycarbonate composition further comprises 0.1 to 1 part by weight of a fluorine-containing anti-dripping agent as component E.

[0022] Optionally, the polycarbonate composition further comprises 1 to 30 parts by weight of an elastomeric resin having a styrene-based copolymer unit as component F.

[0023] Optionally, the elastomeric resin having a styrene-based copolymer unit is at least one of an ABS resin or an ASA resin.

[0024] Optionally, the phosphorus-based flame retardant is at least one of a phosphate compound or a phosphazene compound.

[0025] Optionally, the content of the phosphazene ring trimer of the phosphazene-based flame retardant is 98.5 mol% or more.

[0026] Optionally, the flame retardancy of the polycarbonate composition after the water immersion test is tested to be V-0 level according to the UL-94V test standard. The water immersion test: according to the GB / T11547 standard, where the temperature is 70°C and the immersion time is 168 hours.

[0027] A molded article, which is processed from the above-mentioned polycarbonate composition.

[0028] In the polycarbonate composition of the specific embodiment of the present invention, the polycarbonate composition includes a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, a polyorganosiloxane graft copolymer rubber particle as component C, and a phosphorus-based flame retardant as component D. By combining the polyorganosiloxane content and particle size setting in component C, the polycarbonate composition can well balance the low-temperature impact property, thin-wall flame retardancy property, and light and water resistance property. Specific embodiment

[0029] The specific embodiment of the present invention provides a polycarbonate composition, including:

[0030] The total of the polycarbonate resin as component A and the polycarbonate-polyorganosiloxane copolymer as component B is 100 parts by weight. Among them, based on the weight of polycarbonate in component A and component B, the polyorganosiloxane accounts for 0.4-5.9 wt%.

[0031] 0.5-10 parts by weight of polyorganosiloxane graft copolymer rubber particles as component C. Among them, the mass percentage of polyorganosiloxane in component C is Y%, and the average particle size of component C is Z nm. Y and Z satisfy the following conditions:

[0032] Y≥-Z / 10 + 70 (where Y≥25 and 1000≥Z≥200);

[0033] 0.5-25 parts by weight of phosphorus-based flame retardant as component D.

[0034] The inventors of the present application have found through research that in a polycarbonate flame retardant system containing a polycarbonate resin of component A, a polycarbonate-polyorganosiloxane copolymer of component B, and a phosphorus-based flame retardant of component D, a certain amount of polyorganosiloxane is contained in component A and component B. Based on the total weight of component A and component B, when the polyorganosiloxane in component A and component B accounts for 0.4 to 5.9 wt%, a polyorganosiloxane graft copolymer rubber particle of component C is added. When the particle size of the polyorganosiloxane graft copolymer rubber particle is in the range of 200 nm to 1000 nm, the particle size of the polyorganosiloxane graft copolymer rubber particle and the mass percentage of the polyorganosiloxane in component C in component C are adjusted. In the case where the particle size of the polyorganosiloxane graft copolymer rubber particle decreases, the mass percentage of the polyorganosiloxane in component C in component C is increased. Specifically, the particle size of the polyorganosiloxane graft copolymer rubber particle and the mass percentage of the polyorganosiloxane in component C in component C satisfy the following conditions: Y≥-Z / 10 + 70 (where Y≥25 and 1000≥Z≥200), the polycarbonate composition can well balance the low-temperature impact property, thin-wall flame retardant property, and light and water resistance property.

[0035] In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the polycarbonate of component A and the polycarbonate part of component B are each independently composed of structural units of the following formula (1):

[0036]

[0037] In the above formula (1), e R 1 and f R 2 are each independently selected from a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, a cycloalkyl group having 6 to

[0038] 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 14 carbon atoms, an aralkyl group having 7 to

[0039] 20 carbon atoms, an aralkoxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group, or a carboxyl group. e and f are each independently an integer of 1 to 4. W is selected from at least one group of a single bond or a group represented by the following general formula (2):

[0040]

[0041] In the above formula (2), g R 11 and R 12 、R 13 、R14 , R 15 , R 16 , h R 17 and R 18 are each independently selected from a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 14 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, R 19 and R 20 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aralkoxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group, or a carboxyl group, g is an integer of 1 to 10, and h is an integer of 4 to 7;

[0042] The polyorganosiloxane moiety in the B component is composed of structural units of the following formula (3):

[0043]

[0044] In the above formula (3), R3, R4, R5, R6, R7, and R8 are each independently selected from a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, R9 and R10 are each independently selected from a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, p is a positive integer, q is 0 or a positive integer, the average chain length p + q is a natural number of 30 to 50, and X is a divalent aliphatic group having 2 to 8 carbon atoms.

[0045] In the polycarbonate composition of the specific embodiments of the present invention, in some specific embodiments, the polycarbonate resin as the A component and the polycarbonate - polyorganosiloxane copolymer as the B component total 100 parts by weight. Among them, the polycarbonate resin as the A component can be 0 parts by weight, that is, 100 parts by weight is entirely the polycarbonate - polyorganosiloxane copolymer as the B component.

[0046] In the polycarbonate composition of the specific embodiments of the present invention, in some specific embodiments, in the B component, the polyorganosiloxane accounts for 0.5 to 50 wt% of the weight of the polycarbonate - polyorganosiloxane copolymer, further 5 to 10 wt%, and still further 6 to 9 wt%. The weight percentage of the polyorganosiloxane in the polycarbonate - polyorganosiloxane copolymer can be calculated by nuclear magnetic resonance (NMR) measurement.

[0047] In the polycarbonate composition of the specific embodiments of the present invention, the halogen atom can be, for example, a fluorine atom, a chlorine atom, or a bromine atom, etc.

[0048] The polycarbonate composition of the specific embodiment of the present invention, the alkyl group having 1 to 18 carbon atoms, for example, may be methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl or tetradecyl, etc.

[0049] The polycarbonate composition of the specific embodiment of the present invention, the alkoxy group having 1 to 18 carbon atoms, for example, may be methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy or octyloxy, etc.

[0050] The polycarbonate composition of the specific embodiment of the present invention, the cycloalkyl group having 6 to 20 carbon atoms, for example, may be cyclohexyl or cyclooctyl, etc.

[0051] The polycarbonate composition of the specific embodiment of the present invention, the cycloalkoxy group having 6 to 20 carbon atoms, for example, may be cyclohexyloxy or cyclooctyloxy, etc.

[0052] The polycarbonate composition of the specific embodiment of the present invention, the alkenyl group having 2 to 10 carbon atoms, for example, may be vinyl, propenyl, butenyl or pentenyl, etc.

[0053] The polycarbonate composition of the specific embodiment of the present invention, the aryl group having 6 to 14 carbon atoms, for example, may be phenyl or naphthyl, etc.

[0054] The polycarbonate composition of the specific embodiment of the present invention, the aryloxy group having 6 to 14 carbon atoms, for example, may be phenoxy or naphthyloxy, etc.

[0055] The polycarbonate composition of the specific embodiment of the present invention, the aralkyl group having 7 to 20 carbon atoms, for example, may be benzyl or phenethyl, etc.

[0056] The polycarbonate composition of the specific embodiment of the present invention, the aralkoxy group having 7 to 20 carbon atoms, for example, may be benzyloxy or phenethyloxy, etc.

[0057] The polycarbonate composition of the specific embodiment of the present invention, the alkyl group having 1 to 12 carbon atoms, for example, may be methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl or dodecyl, etc.

[0058] The polycarbonate composition of the specific embodiment of the present invention, the substituted or unsubstituted aryl group having 6 to 12 carbon atoms, for example, may be phenyl or naphthyl, etc., and as the substituent, for example, may be an alkyl group having 1 to 12 carbon atoms such as methyl, ethyl, propyl, butyl, pentyl or hexyl.

[0059] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the R 3 、R 4 、R 5 、R 6 、R 7 and R 8 are independently selected from methyl.

[0060] The polycarbonate composition of the specific embodiment of the present invention, the alkyl group having 1 to 10 carbon atoms, for example, can be methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl or dodecyl, etc.

[0061] The polycarbonate composition of the specific embodiment of the present invention, the alkoxy group having 1 to 10 carbon atoms, for example, can be methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, heptyloxy or octyloxy, etc.

[0062] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, p is 5 to 100, further 30 to 60, q is 0 to 80, further 0 to 50, and p + q is 5 to 70, further 20 to 60, still further 30 to 50.

[0063] The polycarbonate composition of the specific embodiment of the invention, in some specific embodiments, the divalent aliphatic group, for example, can be an alkylene group having 2 to 8 carbon atoms, specifically such as ethylene, propylene or butylene, etc.

[0064] The polycarbonate composition of the specific embodiment of the invention, in some specific embodiments, X is propylene, R 9 and R 10 are hydrogen atoms or methoxy groups.

[0065] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the polycarbonate is prepared by reacting a dihydric phenol and / or an aliphatic diol with a carbonate precursor. As a specific reaction preparation method, for example, it can be interfacial polymerization, melt transesterification, solid-phase transesterification of a carbonate prepolymer, and ring-opening polymerization of a cyclic carbonate compound, etc.

[0066] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the diphenol includes, for example, hydroquinone, resorcinol, 4,4'-dihydroxydiphenylbiphenyl, bis(4-hydroxyphenyl)methane, bis{(4-hydroxy-3,5-dimethyl)phenyl}methane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2,2-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A), 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, 2,2-bis{(4-hydroxy-3,5-dimethyl)phenyl}propane, 2,2-bis{(3-isopropyl-4-hydroxy)phenyl}propane, 2,2-bis{(4-hydroxy-3-phenyl)phenyl}propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)-3-methylbutane, 2,2-bis-(4-hydroxyphenyl)-3,3-dimethylbutane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-4-isopropylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis{(4-hydroxy-3-methyl)phenyl}fluorene, α,α'-bis(4-hydroxyphenyl-o-diisopropylbenzene, α,α'-bis(4-hydroxyphenyl)-m-diisopropylbenzene, α,α'-bis(4-hydroxyphenyl)-p-diisopropylbenzene, 1,3-bis(4-hydroxyphenyl)5,7-dimethyladamantane, 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenyl ether, and 4,4'-dihydroxydiphenyl ester, etc. These diphenols can be used alone or in combination of two or more. Considering the impact resistance performance, in some specific embodiments, the diphenol is bisphenol A.

[0067] The polycarbonate composition of the specific embodiments of the present invention. In some specific embodiments, the aliphatic diols may be, for example, 2,2-bis-(4-hydroxycyclohexyl)-propane, 1,14-tetradecane diol, octaethylene glycol, 1,16-hexadecane diol, 4,4'-bis(2-hydroxyethoxy)biphenyl, bis{(2-hydroxyethoxy)phenyl}methane, 1,1-bis{(2-hydroxyethoxy)phenyl}ethane, 1,1-bis{(2-hydroxyethoxy)phenyl}-1-phenylethane, 2,2-bis{(2-hydroxyethoxy)phenyl}propane, 2,2-bis{(2-hydroxyethoxy)-3-methylphenyl}propane, 1,1-bis{(2-hydroxyethoxy)phenyl}-3,3,5-trimethylcyclohexane, 2,2-bis{4-(2-hydroxyethoxy)-3,3'-biphenyl}propane, 2,2-bis{(2-hydroxyethoxy)-3-isopropylphenyl}propane, 2,2-bis{3-tert-butyl-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{(2-hydroxyethoxy)phenyl}butane, 2,2-bis{(2-hydroxyethoxy)phenyl}-4-methylpentane, 2,2-bis{(2-hydroxyethoxy)phenyl}octane, 1,1-bis{(2-hydroxyethoxy)phenyl}decane, 2,2-bis{3-bromo-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{3,5-dimethyl-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{3-cyclohexyl-4-(2-hydroxyethoxy)phenyl}propane, 1,1-bis{3-cyclohexyl-4-(2-hydroxyethoxy)phenyl}cyclohexane, bis{(2-hydroxyethoxy)phenyl}diphenylmethane, 9,9-bis{(2-hydroxyethoxy)phenyl}fluorene, 9,9-bis{4-(2-hydroxyethoxy)-3-methylphenyl}fluorene, 1,1-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 1,1-bis{(2-hydroxyethoxy)phenyl}cyclopentane, 4,4'-bis(2-hydroxyethoxy)diphenyl ether, 4,4'-bis(2-hydroxyethoxy)-3,3'-dimethyldiphenyl ether, 1,3-bis[2-{(2-hydroxyethoxy)phenyl}propyl]benzene, 1,4-bis[2-{(2-hydroxyethoxy)phenyl}propyl]benzene, 1,4-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 1,3-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 4,8-bis{(2-hydroxyethoxy)phenyl}tricyclo[5.2.1.0 2,6 decane, 1,3-bis{(2-hydroxyethoxy)phenyl}-5,7-dimethyladamantane, 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro(5,5)undecane, 1,4:3,6-dianhydro-D-sorbitol (isosorbide), 1,4:3,6-dianhydro-D-mannitol (isomannitol) or 1,4:3,6-dianhydro-L-iditol (isoidide), etc.

[0068] In the polycarbonate composition of the specific embodiments of the present invention, in some specific embodiments, carbonyl halides, carbonates, haloformates, etc. can be used as the carbonate precursor. Specifically, for example, phosgene, diphenyl carbonate, or dihaloformate of bisphenol can be used. Considering industrialization advantages, in some specific embodiments, the carbonate precursor is phosgene or diphenyl carbonate.

[0069] In the polycarbonate composition of the specific embodiments of the present invention, in some specific embodiments, the viscosity-average molecular weight of the polycarbonate is 15,000 - 30,000, and in some specific embodiments, the viscosity-average molecular weight of the polycarbonate is 18,000 - 25,000.

[0070] In the polycarbonate composition of the specific embodiments of the present invention, in some specific embodiments, the viscosity-average molecular weight of the polycarbonate-polysiloxane copolymer is 15,000 - 27,000, and in some specific embodiments, the viscosity-average molecular weight of the polycarbonate-polysiloxane copolymer is 18,000 - 25,000.

[0071] In the polycarbonate composition of the specific embodiments of the present invention, the viscosity-average molecular weight is obtained as follows: First, using an Ostwald viscometer, the specific viscosity (η SP ) calculated by the following formula is obtained from the solution prepared by dissolving 0.7 g of the aromatic polycarbonate in 100 mL of dichloromethane at 20 °C.

[0072] Specific viscosity (η SP ) = (t - t 0 ) / t 0

[0073] [t 0 is the dropping seconds of dichloromethane, and t is the dropping seconds of the sample solution.

[0074] The viscosity-average molecular weight M is calculated from the obtained specific viscosity (η SP ) through the following formula.

[0075] η SP / c = [η] + 0.45 × [η] 2 c (where [η] is the intrinsic viscosity)

[0076] [η] = 1.23 × 10 -4 M 0.83

[0077] c = 0.7.

[0078] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the polyorganosiloxane graft copolymer rubber particles comprise a polyorganosiloxane rubber component and a graft copolymer monomer component. In some specific embodiments, the polyorganosiloxane rubber component is a polyorganosiloxane rubber or a polyorganosiloxane-(meth)acrylate (IPN type) composite rubber. The (meth)acrylate may be, for example, an acrylic acid alkyl ester such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, etc., and hexyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, etc. In some specific embodiments, the graft copolymer monomer component is a (meth)acrylate. In some specific embodiments, the graft copolymer monomer component may also be an aromatic vinyl compound or a vinyl cyanide compound, etc.

[0079] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the polyorganosiloxane in the polyorganosiloxane graft copolymer rubber particles is polydimethylsiloxane.

[0080] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the average particle diameter Z nm of the C component is 250 - 750 nm. In some specific embodiments, the average particle diameter Z nm of the C component is 300 - 500 nm.

[0081] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the mass percentage Y% of the polyorganosiloxane in the C component in the C component is 25 - 75 wt%. In some specific embodiments, the mass percentage Y% of the polyorganosiloxane in the C component in the C component is 30 - 70 wt%.

[0082] The polycarbonate composition of the specific embodiment of the present invention. The average particle diameter of the polyorganosiloxane graft copolymer can be measured by the following method:

[0083] After configuring the sample to be measured into a 3 wt% solution with deionized water, use a particle size distribution analyzer (CHDF2000 type produced by MATEC) to measure the number average particle diameter. Take the particle median diameter as the measured number average particle diameter Dn.

[0084] The instrument setting conditions are as follows:

[0085] Sample carrier: Special capillary type I carrier for particle separation (trade name: C-202)

[0086] Carrier fluid: Special carrier fluid (trade name: 2XGR500)

[0087] Acidity and alkalinity of the carrier fluid: Neutral

[0088] Carrier flow rate: 1.4 ml / min

[0089] Carrier pressure: 4,000 psi (2,600 kPa)

[0090] Measurement temperature: 35 °C

[0091] Sample usage amount: 0.1 mL.

[0092] The mass percentage content of the organosiloxane in the polyorganosiloxane graft copolymer rubber particles can be measured by the test method of silicon nuclear magnetic resonance (29Si-NMR). The specific implementation of nuclear magnetic resonance is as follows:

[0093] Add chromium(III) tris(2,4-pentanedionate) to deuterated chloroform or dimethyl sulfoxide-D6 to prepare a solution with a concentration of 0.5 wt%. This solution is used as the solvent for 29Si-NMR measurement. If the polyorganosiloxane is insoluble in deuterated chloroform or dimethyl sulfoxide-D6, a heavy water solution with a concentration of 0.5 wt% chromium(III) chloride hexahydrate is used as the solvent for 29Si-NMR measurement. Weigh 1.5 g of the sample to be tested, put it into 2.5 ml of the above-mentioned solvent for 29Si-NMR measurement, dissolve it, and then put it into the prepared NMR test tube. Subsequently, use 29Si-NMR (JNM-ECS400 manufactured by JEOL Ltd., TUNABLE(10), silicon-free, AT10 probe) to measure at an ambient temperature of 25 °C with a Relaxation delay / 15 seconds, number of scans / 1024 times, non-gated decoupling pulse method (NNE) measurement mode, and spin-free setting. The content of the organosiloxane in the copolymer can be calculated based on the signal response intensity of each component.

[0094] In the polycarbonate composition of the specific implementation manner of the present invention, in some specific implementation manners, the phosphorus-based flame retardant is at least one of a phosphate compound or a phosphazene compound. In some specific implementation manners, the phosphate compound is an aryl phosphate compound. In some specific implementation manners, the aryl phosphate compound has the following structure:

[0095]

[0096] In the formula, M represents a divalent organic group derived from a diphenol, Ar 1 、Ar 2 、Ar 3 and Ar 4Each independently represents a monovalent organic group derived from a monohydric phenol. a, b, c and d are each independently 0 or 1, m is an integer from 0 to 5, and in the case of a mixture of condensed phosphates having different degrees of polymerization m, m represents the average value thereof, which is a value from 0 to 5. The dihydric phenol from which the M is derived may be, for example, hydroquinone, resorcinol, bis(4-hydroxydiphenyl)methane, bisphenol A, dihydroxydiphenyl, dihydroxynaphthalene, bis(4-hydroxyphenyl)sulfone or bis(4-hydroxyphenyl)ketone and bis(4-hydroxyphenyl)sulfide, and the Ar is derived 1 ,Ar 2 ,Ar 3 and Ar 4 The monohydric phenol may be specifically phenol, cresol, xylenol, isopropylphenol, butylphenol, p-cumylphenol or 2,6-dimethylphenol, etc. In some specific embodiments, the aryl phosphate compound is a monophosphate compound such as tris(2,6-xylyl)phosphate, a phosphate compound mainly composed of resorcinol bis(2,6-xylyl)phosphate, a phosphate compound mainly composed of 4,4-dihydroxydiphenylbis(diphenylphosphate), or a phosphate compound mainly composed of bisphenol A bis(diphenylphosphate). In some specific embodiments, the monohydric phenol of the aryl phosphate compound may be substituted by a halogen atom. Specific examples of the aryl phosphate compound having a group derived from the monohydric phenol include tris(2,4,6-tribromophenyl)phosphate, tris(2,4-dibromophenyl)phosphate or tris(4-bromophenyl)phosphate.

[0097] In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the structure of the phosphazene flame retardant is as follows:

[0098]

[0099] Where X 1 and X 2 Each of them is independently an aryl group or an aryloxy group, specifically a phenyl group or a phenoxy group, and r is an integer of 3 to 10. In some specific embodiments, the content of the phosphazene ring trimer (k=3) of the phosphazene flame retardant is 90 mol% or more, and in some specific embodiments, the content of the phosphazene ring trimer (k=3) of the phosphazene flame retardant is 98.5 mol% or more.

[0100] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the polycarbonate composition further comprises 0.1 to 1 part by weight of a fluorinated anti-dripping agent as component E. The fluorinated anti-dripping agent can be, for example, polytetrafluoroethylene, tetrafluoroethylene-based copolymers (such as tetrafluoroethylene / hexafluoropropylene copolymers, etc.), partially fluorinated polymers as shown in U.S. Patent No. 4379910, polycarbonate resins manufactured from fluorinated diphenols, etc. Among them, in some specific embodiments, the anti-dripping agent is polytetrafluoroethylene (PTFE).

[0101] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the polycarbonate composition further comprises 1 to 30 parts by weight, further 2 to 10 parts by weight, of an elastomeric resin having a styrene-based copolymer unit as component F. The styrene-based copolymer unit can be, for example, styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, or methoxystyrene, etc. In some specific embodiments, the comonomer of the elastomeric resin includes acrylonitrile. In some specific embodiments, the rubber unit comonomer of the elastomeric resin includes a diene monomer and / or an acrylate-based monomer. The diene monomer can be, for example, isoprene, butadiene, or chloroprene, etc. The acrylate-based monomer can be at least one of acrylate and methacrylate. The acrylate can be, for example, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, octyl acrylate, etc. The methacrylate can be, for example, methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, or octyl methacrylate, etc. In some specific embodiments, the elastomeric resin having a styrene-based copolymer unit is at least one of ABS resin or ASA resin.

[0102] The polycarbonate composition of the specific embodiment of the present invention. In some specific embodiments, the polycarbonate composition has excellent flame retardancy retention characteristics after water immersion. The flame retardancy of the polycarbonate composition after the water immersion experiment is tested as V-0 level according to the UL-94V test standard. The water immersion experiment: according to the GB / T11547 standard, where the temperature is 70°C and the immersion time is 168 hours.

[0103] The polycarbonate composition of the specific embodiments of the present invention. In some specific embodiments, in the polycarbonate composition, the high molecular resin part is composed of a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, and polyorganosiloxane graft copolymer rubber particles as component C. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C is above 25 kJ / m² as tested according to ISO-179. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after the water immersion experiment is above 18 kJ / m² as tested according to ISO-179. The water immersion experiment: according to the GB / T11547 standard, where the temperature is 70°C and the immersion time is 168 hours. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after the light resistance experiment is above 15 kJ / m² as tested according to ISO-179. The light resistance experiment: according to the ASTM G155 (Cycle 1) standard, the temperature is 63 ± 3°C, the humidity is 50 ± 10% RH, pure water is used for spraying, the spraying time for each time is 18 minutes, the water-free time between two sprayings is 102 minutes, and there are 500 spraying cycles.

[0104] The polycarbonate composition of the specific embodiments of the present invention. In some specific embodiments, in the polycarbonate composition, the high molecular resin part is composed of a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, polyorganosiloxane graft copolymer rubber particles as component C, and an elastomer resin having a styrene-based copolymer unit as component F. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C is above 16 kJ / m² as tested according to ISO-179. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after the water immersion experiment is above 10 kJ / m² as tested according to ISO-179. The water immersion experiment: according to the GB / T11547 standard, where the temperature is 70°C and the immersion time is 168 hours. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after the light resistance experiment is above 8 kJ / m² as tested according to ISO-179. The light resistance experiment: according to the ASTM G155 (Cycle 1) standard, the temperature is 63 ± 3°C, the humidity is 50 ± 10% RH, pure water is used for spraying, the spraying time for each time is 18 minutes, the water-free time between two sprayings is 102 minutes, and there are 500 spraying cycles.

[0105] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition further comprises an ultraviolet absorber, and in some specific embodiments, the ultraviolet absorber is selected from at least one ultraviolet absorber of titanium oxide, zinc oxide, zirconium oxide, benzotriazole-based ultraviolet absorbers, triazine-based ultraviolet absorbers, oxazine-based ultraviolet absorbers or malonic esters.

[0106] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition further comprises a release agent, and in some specific embodiments, the release agent is selected from at least one of fatty acid esters, polyolefin waxes, silicone compounds, fluorine compounds (such as fluorine oils represented by polyfluoroalkyl ethers), paraffin waxes or beeswax.

[0107] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition further comprises a stabilizer, specifically, for example, a phosphorus-based stabilizer or a hindered phenol-based antioxidant.

[0108] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition further comprises a metal deactivator, and in some specific embodiments, the metal deactivator is bis[2-(2-hydroxybenzoyl)hydrazide] dodecanedioate.

[0109] The polycarbonate composition of the specific embodiment of the present invention, in order to endow the product with various functions and improve the properties, a small amount of the original additives of the composition itself can also be added, as long as the purpose of the present invention is not affected, these additives can be added in general amounts. As the above additives, for example, a lubricant (such as PTFE particles), a colorant (such as pigments and dyes such as carbon black and titanium oxide), a light diffusing agent (such as acrylic crosslinked particles, silicone crosslinked particles, extremely thin glass flakes, calcium carbonate particles), a fluorescent dye, an inorganic fluorescent substance (such as a fluorescent substance based on aluminate as the mother crystal), an antistatic agent, a nucleating agent, inorganic and organic antibacterial agents, a photocatalyst-based antifouling agent (such as fine titanium oxide, fine zinc oxide), a free radical generator, an infrared absorber (heat ray absorber) and a photochromic agent, etc.

[0110] The specific embodiment of the present invention also provides a preparation method of the above polycarbonate composition, and the preparation method comprises the following steps:

[0111] The polycarbonate composition is prepared from raw materials including a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, polyorganosiloxane graft copolymer rubber particles as component C, and a phosphorus-based flame retardant as component D by a blending method or a method of granulating after blending. Among them, components A, B, C, and D are formulated as follows: The total of the polycarbonate resin as component A and the polycarbonate-polyorganosiloxane copolymer as component B is 100 parts by weight. Among them, based on the total weight of components A and B, the polyorganosiloxane accounts for 0.4 to 5.9 wt%.

[0112] 0.5 to 10 parts by weight of polyorganosiloxane graft copolymer rubber particles as component C. Among them, the mass percentage of polyorganosiloxane in component C is Y%, and the average particle size of component C is Z nm. Y and Z satisfy the following conditions:

[0113] Y ≥ -Z / 10 + 70 (where Y ≥ 25 and 1000 ≥ Z ≥ 200);

[0114] 0.5 to 25 parts by weight of the phosphorus-based flame retardant as component D.

[0115] The preparation method of the polycarbonate composition in the specific embodiments of the present invention can be used to prepare a polycarbonate composition that takes into account low-temperature impact characteristics, thin-wall flame retardant characteristics, and light and water resistance characteristics.

[0116] For the preparation method of the polycarbonate composition in the specific embodiments of the present invention, the blending can be carried out by using a pre-mixing method such as a V-type mixer, a Henschel mixer, a chemical power equipment, an extrusion mixer, etc. to fully mix components A, B, C, D, and any other components. The granulation can be carried out by an extrusion granulator and a granulator, etc. as needed, and then a melting and kneading method using a melting kneader represented by an exhaust-type twin-screw extruder and granulation by a granulator, etc.

[0117] The specific embodiments of the present invention further provide a molded article, which is processed from the above-mentioned polycarbonate composition. In some specific embodiments, the polycarbonate composition is used to produce various articles by a method of injection molding using granules to obtain a molded article. In injection molding, a common cold runner type molding method can be used, and a hot runner method without a sprue can also be used. In injection molding, a common molding method can be used, and gas-assisted injection molding, injection compression molding, ultra-high speed injection molding, injection molding and pressing, two-color molding, sandwich molding, in-mold coating molding, insert molding, foam molding (including using supercritical fluids), rapid heating and cooling mold molding, heat-insulating mold molding, and in-mold remelting molding, and a combination of these molding methods can also be used. In some specific embodiments, various shaped extruded articles are made by extrusion molding and used in the form of sheets, films, etc. In the molding of sheets and films, methods such as blowing and casting can be used for molding, and a heat-shrinkable hose can also be made by performing a specific stretching operation. A rotomolding method that does not require melting and kneading of the resin can also be used to obtain a molded article. In some specific embodiments, the molded article is a mechanical part, an automotive part, an electrical or electronic part, or an office equipment part, etc.

[0118] The following further illustrates the present invention through specific examples.

[0119] Examples

[0120] Performance test description

[0121] 1) Flame retardancy test

[0122] The flame retardancy was determined using the UL94 standard (V test). Among them, the thickness of the test specimens for Examples 1 to 6 and Comparative Examples 1 to 9 was 1.5 mm, and the thickness of the test specimens for Examples 7 to 17 and Comparative Examples 10 to 21 was 2.0 mm.

[0123] 2) Izod impact strength test

[0124] The determination was carried out according to the ISO-179 standard. Test specimens with dimensions of 80 mm × 10 mm × 4 mm were prepared, and the Charpy notched impact strength was determined under the environmental conditions of 23°C.

[0125] 3) Water immersion experiment

[0126] According to the GB / T11547 standard, the temperature was 70°C and the immersion time was 168 hours.

[0127] 4) Light resistance experiment

[0128] According to ASTM G155 (Cycle 1) standard, the temperature is 63 ± 3°C, the humidity is 50 ± 10% RH, pure water is used for spraying, the spraying time each time is 18 minutes, the waterless time between two sprays is 102 minutes, and there are 500 spraying cycles.

[0129] 5) Flowability test

[0130] (Company's own method) Use an injection molding machine [Toshiba Machine Co., Ltd. IS170GN-5Y] to inject into an Archimedes spiral flow length mold (flow path thickness 2mmt, flow path width 8mmt) for flowability evaluation. Injection molding conditions: The injection pressure is set to 98 MPa. Among them, for Examples 1-6 and Comparative Examples 1-9, the barrel temperature is 280°C and the mold temperature is 70°C; for Examples 7-17 and Comparative Examples 10-21, the barrel temperature is 260°C and the mold temperature is 70°C.

[0131] Raw material description

[0132] A-1 Polycarbonate resin is a polycarbonate resin powder (company's own product) with a viscosity-average molecular weight of 22,400 prepared from bisphenol A and phosgene by a conventional method;

[0133] A-2 Polycarbonate resin is a polycarbonate resin powder (company's own product) with a viscosity-average molecular weight of 19,700 prepared from bisphenol A and phosgene by a conventional method.

[0134] B-1 Polycarbonate-polysiloxane copolymer is a polycarbonate-polydimethylsiloxane copolymer (company's own product) with a viscosity-average molecular weight of 19,700, a polydimethylsiloxane mass percentage content of 8.4 wt%, and a polydimethylsiloxane degree of polymerization of 37;

[0135] B-2 Polycarbonate-polysiloxane copolymer is a polycarbonate-polydimethylsiloxane copolymer (company's own product) with a viscosity-average molecular weight of 23,900, a polydimethylsiloxane mass percentage content of 8.4 wt%, and a polydimethylsiloxane degree of polymerization of 37.

[0136] C-1 Polysiloxane-grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polysiloxane) content of 70 wt% and an average particle size of 250 nm;

[0137] C-2 Polysiloxane-grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polysiloxane) content of 30 wt% and an average particle size of 500 nm;

[0138] C-3 Polysiloxane-grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polysiloxane) content of 30 wt% and an average particle size of 500 nm;

[0139] C-4 Polysiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polysiloxane) content 70 wt%, average particle size 150 nm;

[0140] C-5 Polysiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polysiloxane) content 30 wt%, average particle size 300 nm;

[0141] C-6 Polysiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polysiloxane) content 7 wt%, average particle size 200 nm;

[0142] C-7 Polysiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polysiloxane) content 10 wt%, average particle size 500 nm;

[0143] C-8 MBS (methyl methacrylate, butadiene, styrene terpolymer)

[0144] (C223A, Mitsubishi Chemical).

[0145] D-1 Phosphorus-based flame retardant, phosphate ester mainly composed of bis(diphenyl phosphate) of bisphenol A (manufactured by Daihachi Chemical Industry Co., Ltd., CR741)

[0146] D-2 Phosphazene with the structure shown below, wherein the content of the trimer (k = 1) is 68 mol%, the content of the tetramer (k = 2) is 18 mol%, and the content of the multimers with k = 3 or more is 14 mol% of cyclic phenoxyphosphazene.

[0147] D-3 Phosphazene with the structure shown below, wherein the content of the trimer (k = 1) is 98.5 mol% or more of cyclic phenoxyphosphazene.

[0148]

[0149] E-1 Fluorine-containing anti-dripping agent, polytetrafluoroethylene (manufactured by Daikin Industries, Ltd., Polyflon MPAFA500H);

[0150] E-2 Fluorine-containing anti-dripping agent, coated PTFE (polytetrafluoroethylene coated with a copolymer of methyl methacrylate and butyl acrylate) (manufactured by Mitsubishi Chemical Corporation, Metablen A3750).

[0151] F-1 ASA resin (manufactured by INEOS, LURANS 777K);

[0152] F-2 ABS resin (manufactured by Toray Industries, Inc., TOYORAC 700-314).

[0153] Stabilizer - 1 Octadecyl 3-(3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate (manufactured by BASF Corporation, Irgnox1076).

[0154] Stabilizer - 2 Tris(2,4 - di - tert - butylphenyl) phosphite (manufactured by BASF Corporation, Irgafos168). Release agent Pentaerythritol tetrastearate (manufactured by Riken Vitamin Co., Ltd., EW400).

[0155] Ultraviolet absorber 2,2’ - methylenebis[6 - (2H - benzotriazol - 2 - yl) - 4 - (1,1,3,3 - tetramethylbutyl)phenol] (manufactured by ADEKA Corporation, ADEKA STAB LA - 31).

[0156] Examples 1 - 17 and Comparative Examples 1 - 21

[0157] In Examples 1 - 6, the components were mixed uniformly according to the proportions in Table 1 below. In Examples 7 - 17, the components were mixed uniformly according to the proportions in Table 3 below. In Comparative Examples 1 - 9, the component ratios of each material were according to the proportions in Table 2 below, and in Comparative Examples 10 - 31, the component ratios of each material were according to the proportions in Table 4 below. The resin compositions were prepared by uniformly mixing with a drum mixer, and then the resin compositions were fed from the extruder barrel into the extruder for pelletizing. Among them, an exhaust - type twin - screw extruder (Japan Steel Works, Ltd. TEX - 30α) with a screw diameter of was used. The strand was extruded under the conditions that the barrel temperature and the head temperature were 280 °C and the suction pressure at the exhaust port was 3000 Pa, cooled in a water bath, and then the strand was cut into pellets with a pelletizer to complete the pelletizing process.

[0158] In Examples 1 - 6, Comparative Examples 1 - 9, Examples 7 - 17, and Comparative Examples 10 - 21, the obtained pellets were dried for 5 hours at 110 °C and 90 °C respectively using a hot - air circulation dryer, and then injection - molded into test specimens using an injection molding machine [Toshiba Machine Co., Ltd. IS170GN - 5Y] for water immersion experiments, light resistance experiments. Before and after the water immersion experiment and the light resistance experiment, flame retardancy tests and Charpy impact strength tests were carried out at 23 °C and - 30 °C. The test results were listed in Tables 1 - 4 below. Among them, the injection molding conditions were: barrel temperature: 260 °C, mold temperature: 60 °C.

[0159] Table 1 Component ratios and performance test results of Examples 1 - 6

[0160]

[0161] Table 2 Component ratios and performance test results of Comparative Examples 1 - 9

[0162]

[0163] Table 3 Material Ratios and Performance Test Results of Examples 7-17

[0164]

[0165] Table 4 Material Ratios and Performance Test Results of Comparative Examples 10-21

[0166]

[0167] From the result comparison between the examples in Table 1 and the comparative examples in Table 2, as well as the examples in Table 3 and the comparative examples in Table 4 above, it can be seen that through the combination of the present invention, under the same conditions, the polycarbonate composition of the present invention has better comprehensive characteristics of low-temperature impact, thin-wall flame retardancy, and light and water resistance.

[0168] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A polycarbonate composition, characterized in that include: The total weight of the polycarbonate resin as component A and the polycarbonate-polyorganosiloxane copolymer as component B is 100, wherein the polyorganosiloxane accounts for 0.4 to 5.9 wt% based on the total weight of components A and B; 0.5 to 10 parts by weight of polyorganosiloxane graft copolymer rubber particles as component C, wherein the mass percentage of polyorganosiloxane in component C is Y%, the average particle size of component C is Z nm, and Y and Z satisfy the following conditions: Y ≥ -Z / 10+70 (where Y ≥ 25, 1000 ≥ Z ≥ 200); 0.5 to 25 parts by weight of a phosphorus-based flame retardant as component D.

2. The polycarbonate composition according to claim 1, characterized in that The polycarbonate in the component A and the polycarbonate portion in the component B are independently composed of structural units of the following formula (1): In the above formula (1), e R 1 and f R 2 are independently selected from hydrogen, halogen, alkyl having 1 to 18 carbon atoms, alkoxy having 1 to 18 carbon atoms, cycloalkyl having 6 to 20 carbon atoms, cycloalkyloxy having 6 to 20 carbon atoms, alkenyl having 2 to 10 carbon atoms, aryl having 6 to 14 carbon atoms, aryloxy having 6 to 14 carbon atoms, aralkyl having 7 to 20 carbon atoms, aralkyloxy having 7 to 20 carbon atoms, nitro, aldehyde, cyano or carboxyl, e and f are independently an integer of 1 to 4, and W is selected from a single bond or at least one group represented by the following general formula (2): In the above formula (2), g R 11 and R 12 , R 13 , R 14 , R 15 , R 16 , h R 17 and R 18 are independently selected from a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 14 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, 19 and R 20 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aralkyloxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group or a carboxyl group, g is an integer from 1 to 10, and h is an integer from 4 to 7; The polyorganosiloxane part of the component B is composed of the structural units of the following formula (3): In the above formula (3), R3, R4, R5, R6, R7 and R8 are independently selected from hydrogen atoms, alkyl groups having 1 to 12 carbon atoms or substituted or unsubstituted aryl groups having 6 to 12 carbon atoms, R9 and R10 are independently selected from hydrogen atoms, halogen atoms, alkyl groups having 1 to 10 carbon atoms or alkoxy groups having 1 to 10 carbon atoms, p is a positive integer, q is 0 or a positive integer, the average chain length p+q is a natural number of 30 to 50, and X is a divalent aliphatic group having 2 to 8 carbon atoms.

3. The polycarbonate composition according to claim 1, characterized in that The viscosity average molecular weight of the polycarbonate is 15,000 to 30,000.

4. The polycarbonate composition according to claim 1, characterized in that The viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 15,000-27,000.

5. The polycarbonate composition according to claim 1, characterized in that The polycarbonate composition further comprises 0.1 to 1 parts by weight of a fluorine-containing anti-drip agent as component E.

6. The polycarbonate composition according to claim 1, characterized in that The polycarbonate composition further comprises 1 to 30 parts by weight of an elastomer resin having a styrene copolymerization unit as a component (F).

7. The polycarbonate composition according to claim 6, characterized in that The elastomer resin having styrene copolymerization units is at least one of ABS resin and ASA resin.

8. The polycarbonate composition according to claim 1, characterized in that The phosphorus-based flame retardant is at least one of a phosphate compound or a phosphazene compound.

9. The polycarbonate composition according to claim 1, characterized in that The content of the phosphazene cyclotrimer in the phosphazene flame retardant is 98.5 mol % or more.

10. The polycarbonate composition according to claim 1, characterized in that The flame retardancy of the polycarbonate composition after water immersion test is tested as V-0 level according to UL-94V test standard. The water immersion test is in accordance with GB / T11547 standard, wherein the temperature is 70° C. and the immersion time is 168 hours.

11. A molded product, characterized in that: The molded article is made from the polycarbonate composition according to any one of claims 1 to 10.

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