Polycarbonate composition and molded product

Abstract

Specific embodiments of the present invention provide a polycarbonate composition and a molded product thereof. The polycarbonate composition comprises: a polycarbonate resin as component A and a polycarbonate-polyorganosiloxane copolymer as component B, totaling 100 parts by weight, wherein the polyorganosiloxane accounts for 0.4-5.9 wt% based on the total weight of component A and component B; 0.5-10 parts by weight of polyorganosiloxane grafted copolymer rubber particles as component C, wherein the mass fraction of the polyorganosiloxane in component C is Y%, the average particle size of component C is Z nm, and Y and Z meet the following conditions: Y ≥ -Z / 10 + 70 (wherein Y ≥ 25, and 1000 ≥ Z ≥ 200); and 0.5-25 parts by weight of a phosphorus flame retardant as D component. The polycarbonate composition can well achieve low-temperature impact, thin-wall flame retardance and light-resistant and water-resistant characteristics.

Description

Polycarbonate composition and molded product

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on November 27, 2023, with application number 202311592247.2, and invention name “A polycarbonate composition and molded article”, and the Chinese patent application filed with the Patent Office of China on July 16, 2024, with application number 202410951163.1, and invention name “A polycarbonate composition and molded article”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] Polycarbonate resin (PC) is widely used in mechanical parts, automotive components, electrical and electronic components, and office equipment parts due to its excellent properties, including mechanical strength, dimensional stability, and flame retardancy. When used as a raw material in communication boxes, solar power generation junction boxes, and electric vehicle (EV) charging equipment housings, these housings are typically large and used outdoors. These housings require good flowability, thin-wall flame retardancy, and high impact resistance in low-temperature winter environments. Furthermore, they require durability that resists degradation from UV rays, wind, and rain. However, existing polycarbonate resins cannot meet these requirements, necessitating modification.

[0004] To improve the low-temperature impact properties and durability of carbonate resins, JPH00881620A and WO2011 / 1551490 propose methods of adding polytetrafluoroethylene particles or organometallic salt flame retardants to polycarbonate-polydiorganosiloxane copolymers. However, this method has insufficient flame retardancy for thin-walled products or products after water immersion tests. WO2022 / 168454 proposes a method of adding a phosphazene compound and a fluorine-containing dripping preventer to a polycarbonate-polydiorganosiloxane copolymer of a specific viscosity-average molecular weight and a polycarbonate resin. However, due to the high viscosity-average molecular weight and poor fluidity of the polycarbonate-polydiorganosiloxane copolymer, this method cannot achieve both low-temperature impact properties. JP2014058607A proposes a method of adding a polyorganosiloxane-grafted acrylic composite rubber to a polycarbonate-polyorganosiloxane copolymer having specific organosiloxane repeating units. However, this method has insufficient flame retardancy for thin-walled products and needs further improvement in the product's light and water impact resistance.

[0005] Summary of the Invention

[0006] The specific embodiment of the present invention provides a flame retardant polycarbonate composition and molded product that better balances low-temperature impact properties and durability. The specific scheme is as follows:

[0007] A polycarbonate composition comprising:

[0008] 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;

[0009] 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:

[0010] Y ≥ -Z / 10+70 (where Y ≥ 25, 1000 ≥ Z ≥ 200);

[0011] 0.5 to 25 parts by weight of a phosphorus-based flame retardant as component D:

[0012] Optionally, the polycarbonate in component A and the polycarbonate portion in component B are independently composed of structural units of the following formula (1):

[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 to 18 carbon atoms, an alkoxy group having 1 to 18 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 14 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; e and f are each 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):

[0014] 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 hydrogen, 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 R20 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;

[0015] The polyorganosiloxane portion of the component B is composed of the structural units of the following formula (3):

[0016] In the above formula (3), R3, R4, R5, R6, R7 and R8 are independently selected from hydrogen atom, alkyl group having 1 to 12 carbon atoms or substituted or unsubstituted aryl group having 6 to 12 carbon atoms, R9 and R10 are independently selected from hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms or 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.

[0017] Optionally, the viscosity average molecular weight of the polycarbonate is 15,000 to 30,000.

[0018] Optionally, the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 15,000 to 27,000.

[0019] Optionally, the polycarbonate composition further comprises 0.1 to 1 parts by weight of a fluorine-containing anti-drip agent as component E.

[0020] Optionally, the polycarbonate composition further comprises 1 to 30 parts by weight of an elastomer resin having styrene copolymer units as component F.

[0021] Optionally, the elastomeric resin having styrene copolymer units is at least one of ABS resin and ASA resin.

[0022] Optionally, the phosphorus-based flame retardant is at least one of a phosphate compound or a phosphazene compound.

[0023] Optionally, the content of phosphazene cyclotrimer in the phosphazene flame retardant is greater than 98.5 mol%.

[0024] Optionally, the flame retardancy of the polycarbonate composition after a water immersion test is tested as V-0 level according to the UL-94V test standard, and the water immersion test is carried out according to the GB / T11547 standard, wherein the temperature is 70° C. and the immersion time is 168 hours.

[0025] A molded product is made from the above-mentioned polycarbonate composition.

[0026] A polycarbonate composition according to a specific embodiment of the present invention includes 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 combining the polyorganosiloxane content in component C with the particle size, the polycarbonate composition can effectively balance low-temperature impact properties, thin-wall flame retardancy, and light and water resistance. DETAILED DESCRIPTION

[0027] A specific embodiment of the present invention provides a polycarbonate composition, comprising:

[0028] 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 weight of the polycarbonate in components A and B;

[0029] 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:

[0030] Y ≥ -Z / 10+70 (where Y ≥ 25, 1000 ≥ Z ≥ 200);

[0031] 0.5 to 25 parts by weight of a phosphorus-based flame retardant as component D:

[0032] The inventors of the present application have found through research that in a polycarbonate flame retardant system comprising a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, and a phosphorus-based flame retardant as component D, components A and B contain a certain amount of polyorganosiloxane, and when the polyorganosiloxane in components A and B accounts for 0.4 to 5.9 wt% based on the total weight of components A and B, polyorganosiloxane grafted copolymer rubber particles as component C are added, and when the particle size of the polyorganosiloxane grafted copolymer rubber particles is within the range of 200 nm to 1000 nm, the particle size of the polyorganosiloxane grafted copolymer rubber particles is adjusted to be 0.4 to 5.9 wt%. The particle size and the mass percentage of the polyorganosiloxane in the component C are adjusted. When the particle size of the polyorganosiloxane grafted copolymer rubber particles is reduced, the mass percentage of the polyorganosiloxane in the component C is increased. Specifically, when the particle size of the polyorganosiloxane grafted copolymer rubber particles and the mass percentage of the polyorganosiloxane in the component C meet the following conditions: Y ≥ -Z / 10 + 70 (where Y ≥ 25, 1000 ≥ Z ≥ 200), the polycarbonate composition can well balance low-temperature impact properties, thin-wall flame retardant properties, and light and water resistance.

[0033] In some embodiments of the polycarbonate composition of the present invention, the polycarbonate in component A and the polycarbonate portion in component B are independently composed of structural units of the following formula (1):

[0034] 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 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 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; e and f are each 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):

[0035] In the above formula (2), g R 11 and R 12 、R 13 、R 14 、R 15 、R 16 、h R 17 and R 18are independently selected from hydrogen, 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;

[0036] The polyorganosiloxane portion of the component B is composed of the structural units of the following formula (3):

[0037] In the above formula (3), R3, R4, R5, R6, R7 and R8 are independently selected from hydrogen atom, alkyl group having 1 to 12 carbon atoms or substituted or unsubstituted aryl group having 6 to 12 carbon atoms, R9 and R10 are independently selected from hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms or 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.

[0038] In some embodiments of the polycarbonate composition of the present invention, the polycarbonate resin as component A and the polycarbonate-polyorganosiloxane copolymer as component B total 100 parts by weight, wherein the polycarbonate resin as component A may be 0 parts by weight, that is, 100 parts by weight are entirely the polycarbonate-polyorganosiloxane copolymer as component B.

[0039] In some embodiments of the polycarbonate composition of the present invention, the polyorganosiloxane in component B comprises 0.5 to 50 wt %, further 5 to 10 wt %, and even further 6 to 9 wt % of the polycarbonate-polyorganosiloxane copolymer. The weight percentage of the polyorganosiloxane in the polycarbonate-polyorganosiloxane copolymer can be determined by nuclear magnetic resonance (NMR) measurement.

[0040] In the polycarbonate composition according to a specific embodiment of the present invention, the halogen atom may be, for example, a fluorine atom, a chlorine atom, or a bromine atom.

[0041] In the polycarbonate composition of a specific embodiment of the present invention, the alkyl group having 1 to 18 carbon atoms can be, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl or tetradecyl.

[0042] In the polycarbonate composition according to a specific embodiment of the present invention, the alkoxy group having 1 to 18 carbon atoms may be, for example, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, or an octyloxy group.

[0043] In the polycarbonate composition according to a specific embodiment of the present invention, the cycloalkyl group having 6 to 20 carbon atoms may be, for example, a cyclohexyl group or a cyclooctyl group.

[0044] In the polycarbonate composition according to a specific embodiment of the present invention, the cycloalkoxy group having 6 to 20 carbon atoms may be, for example, a cyclohexyloxy group or a cyclooctyloxy group.

[0045] In the polycarbonate composition according to a specific embodiment of the present invention, the alkenyl group having 2 to 10 carbon atoms may be, for example, vinyl, propenyl, butenyl or pentenyl.

[0046] In the polycarbonate composition according to a specific embodiment of the present invention, the aromatic group having 6 to 14 carbon atoms may be, for example, a phenyl group or a naphthyl group.

[0047] In the polycarbonate composition according to a specific embodiment of the present invention, the aryloxy group having 6 to 14 carbon atoms may be, for example, a phenoxy group or a naphthoxy group.

[0048] In the polycarbonate composition according to a specific embodiment of the present invention, the aralkyl group having 7 to 20 carbon atoms may be, for example, a benzyl group or a phenethyl group.

[0049] In the polycarbonate composition according to a specific embodiment of the present invention, the aralkyloxy group having 7 to 20 carbon atoms may be, for example, a benzyloxy group or a phenethyloxy group.

[0050] In the polycarbonate composition according to a specific embodiment of the present invention, the alkyl group having 1 to 12 carbon atoms may be, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl or dodecyl.

[0051] In the polycarbonate composition of a specific embodiment of the present invention, the substituted or unsubstituted aryl group having 6 to 12 carbon atoms may be, for example, a phenyl group or a naphthyl group, and the substituent may be, for example, an alkyl group having 1 to 12 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group or a hexyl group.

[0052] In some embodiments of the polycarbonate composition of the present invention, the R 3 、R4 、R 5 、R 6 、R 7 and R 8 Independently selected from methyl.

[0053] In the polycarbonate composition according to a specific embodiment of the present invention, the alkyl group having 1 to 10 carbon atoms may be, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl or dodecyl.

[0054] In the polycarbonate composition according to a specific embodiment of the present invention, the alkoxy group having 1 to 10 carbon atoms can be, for example, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, a heptyloxy group, or an octyloxy group.

[0055] In some embodiments of the polycarbonate composition of the present invention, p is 5-100, further 30-60, q is 0-80, further 0-50, and p+q is 5-70, further 20-60, and further 30-50.

[0056] In some embodiments of the polycarbonate composition according to the specific embodiment of the present invention, the divalent aliphatic group can be, for example, an alkylene group having 2 to 8 carbon atoms, such as ethylene, propylene, or butylene.

[0057] In some embodiments of the polycarbonate composition of the present invention, X is a propylene group, R 9 and R 10 is a hydrogen atom or a methoxy group.

[0058] In some embodiments of the polycarbonate composition of the present invention, the polycarbonate is prepared by reacting dihydric phenols and / or aliphatic diols with carbonate precursors. Specific reaction preparation methods include, for example, interfacial polymerization, melt transesterification, solid-phase transesterification of carbonate prepolymers, and ring-opening polymerization of cyclic carbonate compounds.

[0059] In some embodiments of the polycarbonate composition of the present invention, the dihydric phenols include, 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, and 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 dihydric phenols can be used alone or in combination of two or more. Considering the impact resistance, in some specific embodiments, the dihydric phenol is bisphenol A.

[0060] In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the aliphatic diols can be, for example, 2,2-bis-(4-hydroxycyclohexyl)-propane, 1,14-tetradecanediol, octaethylene glycol, 1,16-hexadecanediol, 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}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'- Dimethyl diphenyl 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-idiol (isoidiol), etc.

[0061] In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the carbonate precursor can be, for example, a carbonyl halide, a carbonate ester, or a haloformate, and specifically, for example, phosgene, diphenyl carbonate, or a dihaloformate of a dihydric phenol, and the like. Considering the advantages of industrialization, in some specific embodiments, the carbonate precursor is phosgene or diphenyl carbonate.

[0062] In the polycarbonate composition according to the specific embodiment of the present invention, in some specific embodiments, the viscosity average molecular weight of the polycarbonate is 15,000 to 30,000. In some specific embodiments, the viscosity average molecular weight of the polycarbonate is 18,000 to 25,000.

[0063] In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 15,000 to 27,000, and in some specific embodiments, the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 18,000 to 25,000.

[0064] The viscosity average molecular weight of the polycarbonate composition according to a specific embodiment of the present invention is determined as follows: First, using an Ostwald viscometer, 0.7 g of the aromatic polycarbonate is dissolved in 100 mL of dichloromethane at 20° C. to obtain a specific viscosity (η) calculated by the following formula: SP ),

[0065] Specific viscosity (η SP )=(t-t0) / t0

[0066] [t0 is the dripping time of dichloromethane, t is the dripping time of the sample solution]

[0067] The specific viscosity (η SP ) The viscosity average molecular weight M is calculated by the following formula.

[0068] η SP / c=[η]+0.45×[η] 2 c (where [η] is the limiting viscosity)

[0069] [η] = 1.23 × 10 -4 M 0.83

[0070] c=0.7.

[0071] In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the polyorganosiloxane graft copolymer rubber particles include a polyorganosiloxane rubber component and a graft comonomer component. In some specific embodiments, the polyorganosiloxane rubber component is polyorganosiloxane rubber or polyorganosiloxane-(meth)acrylate (IPN type) composite rubber. The (meth)acrylate can be, for example, methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate and other alkyl acrylates and hexyl methacrylate, 2-ethylhexyl methacrylate, n-lauryl methacrylate, etc. In some specific embodiments, the graft comonomer component is (meth)acrylate. In some specific embodiments, the graft comonomer component can also be an aromatic vinyl compound or a vinyl cyanide compound.

[0072] In some embodiments of the polycarbonate composition according to the present invention, the polyorganosiloxane in the polyorganosiloxane graft copolymer rubber particles is polydimethylsiloxane.

[0073] In the polycarbonate composition according to the specific embodiment of the present invention, in some specific embodiments, the average particle size Z nm of the component C is 250 to 750 nm. In some specific embodiments, the average particle size Z nm of the component C is 300 to 500 nm.

[0074] In the polycarbonate composition of a specific embodiment of the present invention, in some specific embodiments, the mass percentage of the polyorganosiloxane in component C is Y% in the component C, which is 25 to 75 wt%. In some specific embodiments, the mass percentage of the polyorganosiloxane in component C is Y% in the component C, which is 30 to 70 wt%.

[0075] The average particle size of the polycarbonate composition of the specific embodiment of the present invention can be measured by the following method:

[0076] After the sample to be tested was prepared into a 3 wt % solution with deionized water, the number average particle size was measured using a particle size distribution analyzer (MATEC CHDF2000 model), and the median diameter of the particles was taken as the measured number average particle size Dn.

[0077] The instrument setting conditions are as follows:

[0078] Sample carrier: Capillary type 1 carrier for particle separation (trade name: C-202)

[0079] Carrier: Special carrier liquid (trade name: 2XGR500)

[0080] Carrier acidity: neutral

[0081] Carrier flow rate: 1.4 ml / min

[0082] Carrier pressure: 4,000psi (2,600kPa)

[0083] Measurement temperature: 35°C

[0084] Sample volume: 0.1 mL.

[0085] The mass percentage of the organosiloxane in the polyorganosiloxane graft copolymer rubber particles can be measured by a silicon atom nuclear magnetic resonance (29Si-NMR) test method. The specific implementation of nuclear magnetic resonance is as follows:

[0086] Add tris(2,4-pentanedione)chromium(III) to deuterated chloroform or dimethyl sulfoxide-D6 to prepare a 0.5wt% solution, which is used as the solvent for 29Si-NMR measurement. If polyorganosiloxane is insoluble in deuterated chloroform or dimethyl sulfoxide-D6, use a 0.5wt% deuterated aqueous solution of chromium(III) chloride hexahydrate as the solvent for 29Si-NMR measurement. Weigh 1.5g of the sample to be tested and dissolve it in 2.5ml of the above-mentioned 29Si-NMR measurement solvent. The NMR test tube was prepared. Subsequently, measurement was performed using 29Si-NMR (JNM-ECS400, TUNABLE (10), silicon-free, AT10 probe, manufactured by JEOL Ltd.) with a relaxation delay of 15 seconds, a scan count of 1024, a non-gate decoupled pulse (NNE) measurement mode, and no spin at an ambient temperature of 25°C. The content of the organosiloxane in the copolymer can be calculated based on the signal response intensity of each component.

[0087] In the polycarbonate composition of the present invention, in some embodiments, the phosphorus-based flame retardant is at least one of a phosphate compound or a phosphazene compound. In some embodiments, the phosphate compound is an aryl phosphate compound. In some embodiments, the aryl phosphate compound has the following structure:

[0088] In the formula, M represents a divalent organic group derived from dihydric phenol, 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, and m is an integer from 0 to 5. In the case of a mixture of condensed phosphates having different degrees of polymerization m, m represents the average value thereof and is a value from 0 to 5. Specific examples of the dihydric phenol from which M is derived include hydroquinone, resorcinol, bis(4-hydroxydiphenyl)methane, bisphenol A, dihydroxydiphenyl, dihydroxynaphthalene, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)ketone, and bis(4-hydroxyphenyl)sulfide. Ar is derived from 1 、Ar 2 、Ar 3 and Ar 4 The monohydric phenol may be, for example, phenol, cresol, xylenol, isopropylphenol, butylphenol, p-cumylphenol or 2,6-dimethylphenol. 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 with 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.

[0089] In some embodiments of the polycarbonate composition according to the present invention, the structure of the phosphazene flame retardant is as follows:

[0090] Where X 1 and X 2 Each of the phosphazene flame retardants is independently an aryl group or an aryloxy group, specifically a phenyl group or a phenoxy group, and r is an integer from 3 to 10. In some specific embodiments, the content of the phosphazene cyclotrimer (k=3) in the phosphazene flame retardant is 90 mol% or more. In some specific embodiments, the content of the phosphazene cyclotrimer (k=3) in the phosphazene flame retardant is 98.5 mol% or more.

[0091] In some embodiments of the polycarbonate composition according to the present invention, the polycarbonate composition further comprises 0.1 to 1 parts by weight of a fluorinated anti-drip agent as component E. The fluorinated anti-drip agent may be, for example, polytetrafluoroethylene, a tetrafluoroethylene copolymer (e.g., a tetrafluoroethylene / hexafluoropropylene copolymer), a partially fluorinated polymer as disclosed in U.S. Patent No. 4,379,910, or a polycarbonate resin made from fluorinated diphenol. In some embodiments, the anti-drip agent is polytetrafluoroethylene (PTFE).

[0092] In some embodiments of the polycarbonate composition of the present invention, the polycarbonate composition further comprises, as component F, 1 to 30 parts by weight, and further 2 to 10 parts by weight, of an elastomer resin having styrene copolymer units. The styrene copolymer units may be, for example, styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, or methoxystyrene. In some embodiments, the comonomer of the elastomer resin comprises acrylonitrile. In some embodiments, the rubber unit comonomer of the elastomer resin comprises a diene monomer and / or an acrylate monomer. The diene monomer may be, for example, isoprene, butadiene, or chloroprene. The acrylate monomer may be at least one of an acrylate and a methacrylate. The acrylate may be, for example, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, or octyl acrylate. The methacrylate may be, for example, methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, or octyl methacrylate. In some specific embodiments, the elastomeric resin having styrene copolymerized units is at least one of ABS resin and ASA resin.

[0093] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, has excellent water immersion resistance and flame retardant retention properties. The flame retardancy of the polycarbonate composition after water immersion test is tested as V-0 level according to the UL-94V test standard. The water immersion test is carried out according to the GB / T11547 standard, wherein the temperature is 70°C and the immersion time is 168 hours.

[0094] In a specific embodiment of the polycarbonate composition of the present invention, in some specific embodiments, the polymer resin portion of the polycarbonate composition 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 greater than 25 kJ / m2 as tested by ISO-179. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after a water immersion test is greater than 18 kJ / m2 as tested by ISO-179. The water immersion test is conducted according to GB / T11547 standard, with a temperature of 70°C and an immersion time of 168 hours. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after a light resistance test is greater than 15 kJ / m2 as tested by ISO-179. The light resistance test is conducted according to ASTM G155 (Cycle 155). 1) Standard, temperature 63±3℃, humidity 50±10%RH, pure water spraying, each spraying time 18 minutes, dry time between two sprayings 102 minutes, 500 spraying cycles.

[0095] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, in the polycarbonate composition, the polymer resin portion 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 copolymer unit as component F. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C is greater than 16 kJ / m2 as tested by ISO-179. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after a water immersion test is greater than 10 kJ / m2 as tested by ISO-179. The water immersion test is conducted according to GB / T11547 standard, with a temperature of 70°C and an immersion time of 168 hours. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after a light resistance test is greater than 8 kJ / m2 as tested by ISO-179. The light resistance test is conducted according to ASTM G155 (Cycle 155). 1) Standard, temperature 63±3℃, humidity 50±10%RH, pure water spraying, each spraying time 18 minutes, dry time between two sprayings 102 minutes, 500 spraying cycles.

[0096] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition further includes a UV absorber. In some specific embodiments, the UV absorber is selected from at least one UV absorber selected from titanium oxide, zinc oxide, zirconium oxide, benzotriazole-based UV absorbers, triazine-based UV absorbers, oxazine-based UV absorbers or malonate.

[0097] The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, further comprises a release agent. In some specific embodiments, the release agent is selected from at least one of fatty acid esters, polyolefin waxes, organosilicon compounds, fluorine compounds (fluorine oils represented by polyfluoroalkyl ethers, etc.), paraffin wax or beeswax.

[0098] In some embodiments of the polycarbonate composition according to the present invention, the composition further comprises a stabilizer, such as a phosphorus stabilizer or a hindered phenol antioxidant.

[0099] In some embodiments of the polycarbonate composition of the present invention, the composition further comprises a metal deactivator. In some embodiments, the metal deactivator is dodecanedioic acid bis[2-(2-hydroxybenzoyl)hydrazide].

[0100] The polycarbonate composition of the present invention may also contain a small amount of its own additives to impart various functions and improve the properties of the product. These additives may be added in standard amounts, provided they do not interfere with the purpose of the present invention. Examples of these additives include lubricants (e.g., PTFE particles), colorants (e.g., pigments and dyes such as carbon black and titanium oxide), light diffusers (e.g., crosslinked acrylic particles, crosslinked silicone particles, ultrathin glass flakes, calcium carbonate particles), fluorescent dyes, inorganic phosphors (e.g., phosphors with aluminate as the matrix), antistatic agents, nucleating agents, inorganic and organic antimicrobial agents, photocatalytic antifouling agents (e.g., microparticles of titanium oxide and zinc oxide), free radical generators, infrared absorbers (heat absorbers), and photochromic agents.

[0101] A specific embodiment of the present invention further provides a method for preparing the above-mentioned polycarbonate composition, the preparation method comprising the following steps:

[0102] The polycarbonate composition is prepared by blending or granulating 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, wherein components A, B, C, and D are formulated as follows: the total weight of the polycarbonate resin as component A and the polycarbonate-polyorganosiloxane copolymer as component B is 100 weight percent, wherein the polyorganosiloxane accounts for 0.4 to 5.9 weight percent based on the total weight of components A and B;

[0103] 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:

[0104] Y ≥ -Z / 10+70 (where Y ≥ 25, 1000 ≥ Z ≥ 200);

[0105] 0.5 to 25 parts by weight of a phosphorus-based flame retardant as component D:

[0106] The method for preparing the polycarbonate composition according to the specific embodiment of the present invention can be used to prepare a polycarbonate composition that has low-temperature impact properties, thin-wall flame retardant properties, and light and water resistance.

[0107] The preparation method of the polycarbonate composition of the specific embodiment of the present invention, the blending can be carried out by, for example, a pre-mixing method such as a V-type mixer, a Henschel mixer, a chemical power device, an extrusion mixer, etc. to fully mix the A component, B component, C component, D component and any other components. The granulation can be carried out, for example, by granulating using an extrusion granulator and a granulator as needed, and then melt-mixing using a melt-kneading machine represented by a vented twin-screw extruder, or granulating using a granulator, etc.

[0108] Specific embodiments of the present invention also provide a molded article, which is processed from the polycarbonate composition described above. In some embodiments, the polycarbonate composition is used to produce various products by injection molding pellets to obtain molded articles. In injection molding, conventional cold runner molding methods can be used, as can hot runner methods without a handle. Conventional molding methods can also be used, as can gas-assisted injection molding, injection compression molding, ultra-high-speed injection molding, injection compression molding, two-color molding, sandwich molding, in-mold cladding molding, insert molding, foam molding (including using supercritical fluids), rapid heating and cooling mold molding, insulation mold molding, in-mold remelting molding, and combinations of these molding methods. In some embodiments, various special-shaped extruded articles are produced by extrusion molding and used in the form of sheets, films, etc. Sheets and films can be formed using methods such as inflation and casting. Heat-shrinkable hoses can also be produced by performing specific stretching operations. Rotational molding, which does not require melt mixing of the resin, can also be used to produce the molded articles. In some specific embodiments, the molded article is a mechanical part, an automobile part, an electrical or electronic part, or an office equipment part.

[0109] The present invention is further described below with reference to specific examples.

[0110] Example

[0111] Performance Test Description

[0112] 1) Flame retardancy test

[0113] The flame retardancy test was conducted using the UL94 standard (V test), wherein the thickness of the test specimens of Examples 1 to 6 and Comparative Examples 1 to 9 was 1.5 mm, and the thickness of the test specimens of Examples 7 to 17 and Comparative Examples 10 to 21 was 2.0 mm.

[0114] 2) Charpy impact strength test

[0115] The ISO-179 standard was used for the measurement. Test specimens with a size of 80 mm × 10 mm × 4 mm were made and the Charpy notched impact strength was measured at 23°C.

[0116] 3) Water immersion test

[0117] According to GB / T11547 standard, the temperature is 70℃ and the soaking time is 168 hours.

[0118] 4) Light resistance test

[0119] 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, each spraying time is 18 minutes, the dry time between two sprayings is 102 minutes, and 500 spraying cycles are performed.

[0120] 5) Liquidity test

[0121] (Self-made method) Flowability was evaluated using an injection molding machine (Toshiba Machine Co., Ltd. IS170GN-5Y) in a long Archimedean spiral flow mold (flow path thickness 2 mmt, flow path width 8 mmt). Injection molding conditions: injection pressure was set at 98 MPa, with a barrel temperature of 280°C and a mold temperature of 70°C for Examples 1-6 and Comparative Examples 1-9, and a barrel temperature of 260°C and a mold temperature of 70°C for Examples 7-17 and Comparative Examples 10-21.

[0122] Ingredients

[0123] A-1 Polycarbonate Resin: Polycarbonate resin powder with a viscosity-average molecular weight of 22,400 (product of our company) prepared by conventional methods from bisphenol A and phosgene.

[0124] A-2 Polycarbonate Resin: A polycarbonate resin powder (product of the company) having a viscosity average molecular weight of 19,700, prepared from bisphenol A and phosgene by a conventional method.

[0125] B-1: a polycarbonate-polyorganosiloxane copolymer having a viscosity-average molecular weight of 19,700, a polydimethylsiloxane content of 8.4 wt%, and a degree of polymerization of polydimethylsiloxane of 37 (a product of the company);

[0126] B-2 polycarbonate-polyorganosiloxane copolymer with a viscosity-average molecular weight of 23,900, a polydimethylsiloxane content of 8.4 wt%, and a degree of polymerization of polydimethylsiloxane of 37 (a product of the company).

[0127] C-1 polydimethylsiloxane (polydimethylsiloxane) grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polydimethylsiloxane) content of 70 wt% and an average particle size of 250 nm;

[0128] C-2 polydimethylsiloxane (polydimethylsiloxane) grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polydimethylsiloxane) content of 30 wt% and an average particle size of 500 nm;

[0129] C-3 polydimethylsiloxane (polyorganosiloxane) grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polyorganosiloxane) content of 30 wt% and an average particle size of 500 nm;

[0130] C-4 polyorganosiloxane grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polyorganosiloxane) content of 70 wt% and an average particle size of 150 nm;

[0131] C-5 polydimethylsiloxane (polydimethylsiloxane) grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polydimethylsiloxane) content of 30 wt% and an average particle size of 300 nm;

[0132] C-6 polydimethylsiloxane (polydimethylsiloxane) grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polydimethylsiloxane) content of 7 wt% and an average particle size of 200 nm;

[0133] C-7 polydimethylsiloxane (polydimethylsiloxane) grafted acrylate copolymer rubber particles with a polydimethylsiloxane (polydimethylsiloxane) content of 10 wt% and an average particle size of 500 nm;

[0134] C-8MBS (methyl methacrylate, butadiene, styrene terpolymer) (C223A, Mitsubishi Chemical).

[0135] D-1 Phosphorus flame retardant: Phosphate ester containing bisphenol A bis(diphenyl phosphate) as the main component (manufactured by Daichi Chemical Industry Co., Ltd., CR741)

[0136] D-2 is a cyclic phenoxyphosphazene having a structure represented by the following formula, 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 multimer with k=3 or greater is 14 mol%.

[0137] D-3 is a cyclic phenoxyphosphazene having a structure represented by the following formula, wherein the content of the trimer (k=1) is 98.5 mol% or more.

[0138] E-1 fluorinated anti-drip agent polytetrafluoroethylene (manufactured by Daikin Industries, Ltd., Polyfluoren MPA FA500H);

[0139] E-2 fluorine-containing anti-drip agent-coated PTFE (polytetrafluoroethylene coated with a copolymer of methyl methacrylate and butyl acrylate) (manufactured by Mitsubishi Chemical Corporation, Metablen A3750).

[0140] F-1 ASA resin (manufactured by INEOS, LURANS777K);

[0141] F-2 ABS resin (manufactured by Toray Industries, Ltd., TOYORAC 700-314).

[0142] Stabilizer-1: Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (manufactured by BASF Corporation, Irgnox 1076).

[0143] Stabilizer: 2-tris(2,4-di-tert-butylphenyl)phosphite (manufactured by BASF, Irgafos 168).

[0144] Mold release agent: pentaerythritol tetrastearate (manufactured by Riken Vitamin Co., Ltd., EW400).

[0145] Ultraviolet absorber: 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol (ADEKA STAB LA-31, manufactured by ADEKA Corporation).

[0146] Examples 1-17 and Comparative Examples 1-21

[0147] The materials of Examples 1-6 were mixed in the proportions shown in Table 1, the materials of Examples 7-17 were mixed in the proportions shown in Table 3, the materials of Comparative Examples 1-9 were mixed in the proportions shown in Table 2, and the materials of Comparative Examples 10-31 were mixed in the proportions shown in Table 4. The mixture was uniformly mixed in a drum mixer to prepare a resin composition, and then the resin composition was transported from the extruder barrel to an extruder for granulation. The extruder used a screw with a diameter of The vented twin-screw extruder (TEX-30α, manufactured by The Japan Steel Works, Ltd.) was used to extrude strands at a barrel and die temperature of 280°C and a suction pressure of 3000 Pa at the vent port. The strands were cooled in a water bath and then cut into pellets using a pelletizer to complete the pelletizing process.

[0148] In Examples 1 to 6, Comparative Examples 1 to 9, Examples 7 to 17, and Comparative Examples 10 to 21, the obtained pellets were dried at 110° C. and 90° C. for 5 hours, respectively, using a hot air circulation dryer. Then, the pellets were injected into test specimens using an injection molding machine [IS170GN-5Y from Toshiba Machine Co., Ltd.] and subjected to water immersion and light resistance tests. Flame retardancy tests and Charpy impact strength tests were performed at 23° C. and -30° C. before and after the water immersion and light resistance tests. The test results are listed in the following Tables 1 to 4, where the injection molding conditions are: barrel temperature: 260° C., mold temperature: 60° C.

[0149] Table 1 Material ratios and performance test results of Examples 1-6

[0150] Table 2 Material ratios and performance test results of Comparative Examples 1-9

[0151] Table 3 Material ratios and performance test results of Examples 7-17

[0152] Table 4 Material ratios and performance test results of Comparative Examples 10-21

[0153] From the comparison of the results of the embodiment in Table 1 and the comparative example in Table 2, and the comparison of the results of the embodiment in Table 3 and the comparative example in Table 4, 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 low-temperature impact, thin-wall flame retardancy, and light and water resistance.

[0154] 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 scope of protection of the present invention should be based on 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 atom, alkyl group having 1 to 12 carbon atoms or substituted or unsubstituted aryl group having 6 to 12 carbon atoms, R9 and R10 are independently selected from hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms or 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.

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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