WO2025113131A1 - Polycarbonate composition and molded product - Google Patents

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

A polycarbonate composition and molded product

This application claims priority to the Chinese patent application filed with the Chinese Patent Office 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 Chinese Patent Office 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

The invention belongs to the field of polymer materials, and in particular relates to a polycarbonate composition and a molded product.

Background Art

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 in communication boxes, solar power generation junction boxes, and electric vehicle (EV) charging equipment housings, since the housings are usually large and used outdoors, they need to have good fluidity, thin-wall flame retardancy, high impact resistance in low-temperature winter environments, and durability that is not easily degraded by ultraviolet rays or wind and rain. However, existing polycarbonate resins cannot meet these requirements and need to be modified.

In order to improve the low-temperature impact properties and durability of carbonate resins, JPH00881620A and WO2011/1551490 proposed a method of adding polytetrafluoroethylene particles or organic metal 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 proposed a method of adding phosphazene compounds and fluorine-containing dripping prevention agents to polycarbonate-polydiorganosiloxane copolymers with a specific viscosity-average molecular weight and polycarbonate resins. In this method, since the viscosity-average molecular weight of polycarbonate-polydiorganosiloxane copolymers is high and the fluidity is poor, low-temperature impact properties cannot be taken into account. JP2014058607A proposed adding polyorganosiloxane binders to polycarbonate-polyorganosiloxane copolymers with specific organosiloxane repeating units. The method of preparing branched acrylic rubber composites has insufficient flame retardancy for thin-walled products and needs to be further improved in terms of the light and water impact resistance of the products.

Summary of the invention

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

A polycarbonate composition comprising:

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.

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

In the above formula (1), e ^R1 and f ^R2 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 of the groups represented by the following general formula (2): Groups:

In the above formula (2), g ^R11 and ^R12 , ^R13 , ^R14 , ^R15 , ^R16 , h ^R17 and R18 are independently selected from hydrogen atom, alkyl group having 1 to 18 carbon atoms, aryl group having 6 to 14 carbon atoms or aralkyl group having 7 to 20 carbon atoms, ^R19 and R10 are independently selected from hydrogen atom, alkyl group having 1 to ¹⁸ carbon atoms, aryl group having 6 to 14 carbon atoms or aralkyl group having 7 to 20 carbon atoms. ^{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.

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

Optionally, the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 15000～27000.

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

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

Optionally, the elastomeric resin having styrene copolymer units is at least one of ABS resin or ASA resin.

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

Optionally, the content of phosphazene cyclotrimer in the phosphazene flame retardant is 98.5 mol% or more.

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 in accordance with the GB/T11547 standard, wherein the temperature is 70° C. and the immersion time is 168 hours.

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

The polycarbonate composition of a specific embodiment of the present invention comprises 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 setting, the polycarbonate composition can well take into account low-temperature impact properties, thin-wall flame retardant properties, and light and water resistance properties.

DETAILED DESCRIPTION

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

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;

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.

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 based on the total weight of components A and B, when the polyorganosiloxane in components A and B accounts for 0.4 to 5.9 wt %, polyorganosiloxane graft copolymer rubber particles as component C are added, and when the particle size of the polyorganosiloxane graft copolymer rubber particles is in the range of 200 nm to 1000 nm, the size of the polyorganosiloxane graft copolymer rubber particles is adjusted to The particle size and the mass percentage of the polyorganosiloxane in the C component in the C component are such that when the particle size of the polyorganosiloxane grafted copolymer rubber particles is reduced, the mass percentage of the polyorganosiloxane in the C component in the C component is increased. Specifically, when the particle size of the polyorganosiloxane grafted copolymer rubber particles and the mass percentage of the polyorganosiloxane in the C component in the C component meet the following conditions: Y≥-Z/10+70 (wherein Y≥25, 1000≥Z≥200), the polycarbonate composition can well take into account low-temperature impact properties, thin-wall flame retardant properties, and light and water resistance properties.

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

In the above formula (1), e ^R1 and f ^R2 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 a group represented by the following general formula (2): At least one group in the group:

In the above formula (2), g ^R11 and ^R12 , ^R13 , ^R14 , ^R15 , ^R16 , h ^R17 and R18 are independently selected from hydrogen atom, alkyl group having 1 to 18 carbon atoms, aryl group having 6 to 14 carbon atoms or aralkyl group having 7 to 20 carbon atoms, ^R19 and R10 are independently selected from hydrogen atom, alkyl group having 1 to ¹⁸ carbon atoms, aryl group having 6 to 14 carbon atoms or aralkyl group having 7 to 20 carbon atoms. ^{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.

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 are 100% in total. Component A may contain 0 parts by weight of the polycarbonate resin, that is, component B may contain 100 parts by weight of the polycarbonate-polyorganosiloxane copolymer.

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

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

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

In the polycarbonate composition of the 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.

In the polycarbonate composition of the 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.

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.

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

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.

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.

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

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.

In the polycarbonate composition of the 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.

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

In some embodiments of the polycarbonate composition of the present invention, R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are independently selected from methyl groups.

In the polycarbonate composition of the 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.

In the polycarbonate composition of the specific embodiment of the present invention, the alkoxy group having 1 to 10 carbon atoms may 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.

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.

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

In the polycarbonate composition according to the specific embodiment of the present invention, in some specific embodiments, X is a propylene group, and R ⁹ and R ¹⁰ are hydrogen atoms or methoxy groups.

In some specific embodiments of the polycarbonate composition of the specific embodiment of the present invention, the polycarbonate is prepared by reacting dihydric phenols and/or aliphatic diols with carbonate precursors. The specific reaction preparation method may be, for example, interfacial polymerization, melt transesterification, solid phase transesterification of carbonate prepolymers, and ring-opening polymerization of cyclic carbonate compounds.

In some embodiments of the polycarbonate composition of the present invention, the dihydric phenols include hydroquinone, resorcinol, 4,4′-dihydroxydiphenyl biphenyl, 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 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.

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-iditol (isoiditol), etc.

In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the carbonate precursor can be, for example, carbonyl halide, carbonate or haloformates, such as phosgene, diphenyl carbonate or dihaloformates of dihydric phenol, etc. Considering the convenience of industrialization, in some specific embodiments, the carbonate precursor is phosgene or diphenyl carbonate.

In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the viscosity average molecular weight of the polycarbonate is 15000-30000, and in some specific embodiments, the viscosity average molecular weight of the polycarbonate is 18000-25000.

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 15,000-27,000, and in some specific embodiments, the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 18,000-25,000.

The viscosity average molecular weight of the polycarbonate composition of the specific embodiment of the present invention is obtained 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 _SP ) calculated by the following formula:

Specific viscosity (η _SP ) = (tt ₀ )/t ₀

[ _t0 is the dripping seconds of dichloromethane, t is the dripping seconds of the sample solution]

The viscosity average molecular weight M is calculated from the obtained specific viscosity (η _SP ) by the following formula.

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

[η]＝1.23×10 ^-4 M ^0.83

c=0.7.

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 copolymer monomer component. In some specific embodiments, the polyorganosiloxane rubber component is a polyorganosiloxane Alkane 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 copolymer component is (meth)acrylate. In some specific embodiments, the graft copolymer component can also be an aromatic vinyl compound or a vinyl cyanide compound, etc.

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

In the polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the average particle size Z nm of the C component is 250-750 nm, and in some specific embodiments, the average particle size Z nm of the C component is 300-500 nm.

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

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

After the sample to be tested is prepared into a 3 wt % solution with deionized water, the number average particle diameter is measured using a particle size distribution analyzer (CHDF2000 produced by MATEC), and the particle median diameter is taken as the measured number average particle diameter Dn.

The instrument setting conditions are as follows:

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

Carrier: Special carrier liquid (trade name: 2XGR500)

Carrier acidity: neutral

Carrier flow rate: 1.4ml/min

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

Measurement temperature: 35℃

Sample volume: 0.1mL.

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:

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

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

In the formula, M represents a divalent organic group derived from a dihydric phenol, and Ar ¹ , Ar ² , Ar ³ and Ar ⁴ each independently represent a monovalent organic group derived from a monohydric phenol. a, b, c and d each independently represent 0 or 1, m is an integer of 0 to 5, and in the case of a mixture of condensed phosphates having different polymerization degrees m, m represents the average value thereof, which is a value of 0 to 5. The dihydric phenol from which 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 monohydric phenol from which Ar ¹ , Ar ² , Ar ³ and Ar ⁴ are derived 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, resorcinol bis(2,6-diphenyl)phosphate, In some specific embodiments, the monophenol of the aryl phosphate compound can be substituted by a halogen atom. Specific examples of aryl phosphate compounds having a group derived from the monophenol include tris(2,4,6-tribromophenyl) phosphate and tris(2,4-dibromophenyl) phosphate or tris(4-bromophenyl) phosphate.

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:

In the formula, ^X1 and ^X2 are independently aryl or aryloxy, specifically phenyl or phenoxy, and r is an integer of 3 to 10. In some specific embodiments, the content of phosphazene ring trimer (k=3) of the phosphazene flame retardant is 90 mol% or more, and in some specific embodiments, the content of phosphazene ring trimer (k=3) of the phosphazene flame retardant is 98.5 mol% or more.

The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, further comprises 0.1 to 1 parts by weight of a fluorine-containing anti-drip agent as component E, wherein the fluorine-containing anti-drip agent may be, for example, polytetrafluoroethylene, tetrafluoroethylene copolymers (e.g., tetrafluoroethylene/hexafluoropropylene copolymers, etc.), partially fluorinated polymers such as those shown in U.S. Patent No. 4,379,910, polycarbonate resins made from fluorinated diphenols, etc. Among them, in some specific embodiments, the anti-drip agent is polytetrafluoroethylene (PTFE).

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

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 based on the GB/T11547 standard, wherein the temperature is 70°C and the immersion time is 168 hours.

The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, in the polycarbonate composition, the polymer resin part is composed of a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, and a polyorganosiloxane graft copolymer rubber particle 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 by ISO-179. In some specific embodiments, the Charpy impact strength of the polycarbonate composition at -30°C after water immersion test is above 25 kJ/m2 as tested by ISO-179. 9 tested at more than 18 kJ/m2, the water immersion test: according to GB/T11547 standard, wherein 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 test is tested according to ISO-179 at more than 15 kJ/m2, the light resistance experiment: 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 water-free time between two sprayings is 102 minutes, and 500 spraying cycles are repeated.

The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, in the polycarbonate composition, the polymer resin part is composed of a polycarbonate resin as component A, a polycarbonate-polyorganosiloxane copolymer as component B, a polyorganosiloxane graft copolymer rubber particle 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 above 16 kJ/m2 as tested by ISO-179. In some specific embodiments, the polycarbonate composition The Charpy impact strength at -30°C after the water immersion test is above 10 kJ/m2 as tested by ISO-179, wherein the water immersion test is performed according to GB/T11547 standard, wherein 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 test is above 8 kJ/m2 as tested by ISO-179, wherein the light resistance test is performed according to ASTM G155 (Cycle 1) standard, wherein 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 water-free time between two sprayings is 102 minutes, and 500 spraying cycles are performed.

The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition also includes a UV absorber. In some specific embodiments, the UV absorber is selected from at least one UV absorber of titanium oxide, zinc oxide, zirconium oxide, benzotriazole UV absorbers, triazine UV absorbers, oxazine UV absorbers or malonic acid esters.

The polycarbonate composition of the specific embodiment of the present invention, in some specific embodiments, the composition also includes 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 (fluorine oils represented by polyfluoroalkyl ethers, etc.), paraffin wax or beeswax, etc.

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

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

The polycarbonate composition of the specific embodiment of the present invention may be mixed with a small amount of its own additives in order to impart various functions to the product and improve the characteristics. As long as the purpose of the present invention is not affected, these additives may be mixed in a general amount. Examples of the above-mentioned additives include lubricants (e.g., PTFE particles), colorants (e.g., pigments and dyes such as carbon black and titanium oxide), light diffusers (e.g., acrylic cross-linked particles, silicone cross-linked particles, ultra-thin glass flakes, calcium carbonate particles), fluorescent dyes, inorganic phosphors (e.g., phosphors with aluminate as the mother crystal), antistatic agents, nucleating agents, inorganic and organic antibacterial agents, photocatalyst-based antifouling agents (e.g., micro-particle titanium oxide, micro-particle zinc oxide), free radical generators, infrared absorbers (heat absorbers), and photochromic agents.

The specific embodiment of the present invention also provides a method for preparing the above-mentioned polycarbonate composition, The preparation method comprises the following steps:

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 the components A, B, C, and D are formulated in the following manner: the total weight of the polycarbonate resin as component A and the polycarbonate-polyorganosiloxane copolymer as component B is 100 weight, wherein the polyorganosiloxane accounts for 0.4-5.9wt% based on the total weight of the 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.

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

The preparation method of the polycarbonate composition of the specific embodiment of the present invention, the blending can be carried out by pre-mixing methods 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, and the granulation can be carried out by, for example, an extrusion granulator and a granulator as needed, and then melt-mixed by a melt-kneading machine represented by a venting twin-screw extruder, and granulated by a granulator.

A specific embodiment of the present invention also provides a molded product, which is processed from the polycarbonate composition described above. In some specific embodiments, the polycarbonate composition is used to prepare various products by using particles to obtain molded products through injection molding. In injection molding, a common cold runner molding method can be used, and a hot runner method without a handle 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, two-color molding, sandwich molding, in-mold coating molding, insert molding, foam molding (including the use of supercritical fluids), rapid heating and cooling mold molding, insulation mold molding and in-mold remelting molding, as well as combinations of these molding methods, can also be used. In some specific embodiments, various special-shaped extrusion molded products are made by extrusion molding, in the form of sheets, films, etc. In the molding of sheets and films, the molding can be performed by methods such as inflation and casting, and a heat shrink hose can be made by performing a specific stretching operation. The molded product can also be produced by rotational molding without melting and kneading the resin. In some specific embodiments, the molded product is a mechanical part, an automobile part, an electrical or electronic part, or an office equipment part.

The present invention is further described below by means of specific examples.

Example

Performance Test Description

1) Flame retardancy test

The flame retardancy was measured according to UL94 standard (V test), wherein the thickness of the test strips of Examples 1 to 6 and Comparative Examples 1 to 9 was 1.5 mm, and the thickness of the test strips of Examples 7 to 17 and Comparative Examples 10 to 21 was 2.0 mm.

2) Charpy impact strength test

The ISO-179 standard was used for the measurement, and a test specimen with a size of 80 mm×10 mm×4 mm was prepared. The Charpy notched impact strength was measured at 23°C.

3) Water immersion test

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

4) Light resistance test

According to ASTM G155 (Cycle 1) standard, the temperature is 63±3℃, the humidity is 50±10%RH, pure water is used for spraying, each spraying time is 18 minutes, the water-free time between two sprayings is 102 minutes, and 500 spraying cycles are performed.

5) Liquidity test

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

Ingredients

A-1 Polycarbonate resin: A polycarbonate resin powder with a viscosity average molecular weight of 22,400 (self-produced product) prepared from bisphenol A and phosgene by conventional methods;

A-2 Polycarbonate Resin Polycarbonate resin powder with a viscosity-average molecular weight of 19,700 (self-produced product) made from bisphenol A and phosgene by conventional methods.

B-1 Polycarbonate-polyorganosiloxane copolymer: a polycarbonate-polydimethylsiloxane copolymer having a viscosity average molecular weight of 19,700, a polydimethylsiloxane mass percentage of 8.4wt%, and a polydimethylsiloxane polymerization degree of 37 (a self-produced product);

B-2 Polycarbonate-polyorganosiloxane copolymer is a polycarbonate-polydimethylsiloxane copolymer with a viscosity-average molecular weight of 23,900, a polydimethylsiloxane mass percentage of 8.4wt%, and a polydimethylsiloxane polymerization degree of 37 (self-produced product).

C-1 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 70wt%, average particle size 250nm;

C-2 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 30wt%, average particle size 500nm;

C-3 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 30wt%, average particle size 500nm;

C-4 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 70wt%, average particle size 150nm;

C-5 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 30wt%, average particle size 300nm;

C-6 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 7wt%, average particle size 200nm;

C-7 polyorganosiloxane grafted acrylate copolymer rubber particles, polydimethylsiloxane (polyorganosiloxane) content 10wt%, average particle size 500nm;

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

D-1 Phosphorus flame retardant Phosphate ester with bisphenol A bis(diphenyl phosphate) as the main component (made by Daichika Kogyo Co., Ltd., CR741)

D-2 is a phosphazene 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 polymer with k=3 or more is 14 mol%, which is a cyclic phenoxyphosphazene.

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

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

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

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

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

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

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

Release agent: Pentaerythritol tetrastearate (manufactured by Riken Vitamin Co., Ltd., EW400).

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

Examples 1-17 and Comparative Examples 1-21

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

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

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

Table 2 Material ratios and performance test results of comparative examples 1-9

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

Table 4 Material ratios and performance test results of comparative examples 10-21

From the comparison of the results of the embodiment in Table 1 and the comparative example in Table 2, and the comparison 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 comprehensive properties.

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 shall be subject to the scope defined by the claims.

Claims (11)

A polycarbonate composition, characterized in that it comprises: 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. The polycarbonate composition according to claim 1, characterized in that the polycarbonate in component A and the polycarbonate portion in component B are independently composed of structural units of the following formula (1):
In the above formula (1), e ^R1 and f ^R2 are 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 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 ^R11 and ^R12 , ^R13 , ^R14 , ^R15 , ^R16 , h ^R17 and ^R18 are independently selected from hydrogen atom, alkyl group having 1 to 18 carbon atoms, aryl group having 6 to 14 carbon atoms or aralkyl group having 7 to 20 carbon atoms, ^R19 and R10 are independently selected from hydrogen atom, alkyl group having 1 to 18 carbon atoms, aryl group having 6 to 14 carbon atoms or aralkyl group having 7 to 20 carbon atoms. ^{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. The polycarbonate composition according to claim 1, wherein the viscosity average molecular weight of the polycarbonate is 15,000 to 30,000. The polycarbonate composition according to claim 1, characterized in that the viscosity average molecular weight of the polycarbonate-polyorganosiloxane copolymer is 15000 to 27000. 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. 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 copolymer unit as component F. The polycarbonate composition according to claim 6, characterized in that the elastomeric resin having styrene copolymerized units is at least one of ABS resin or ASA resin. 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. The polycarbonate composition according to claim 1, characterized in that the content of the phosphazene cyclotrimer of the phosphazene flame retardant is 98.5 mol% or more. The polycarbonate composition according to claim 1 is 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, and the water immersion test is in accordance with GB/T11547 standard, wherein the temperature is 70°C and the immersion time is 168 hours. A molded product, characterized in that the molded product is processed from the polycarbonate composition according to any one of claims 1 to 10.