KR20180008823A - Flame retardant thermoplastic resin composition and article comprising the same - Google Patents

Abstract

A thermoplastic resin composition of the present invention is composed of: a base resin containing a polycarbonate resin and a polysiloxane-polycarbonate copolymer resin; an impact reinforcement agent; a phosphorus-based flame retardant; and an inorganic filler. The inorganic filler contains talc and wollastonite whose average diameter is 5-10 m with a diameter-to-length ratio of 1 : 7-9. The thermoplastic resin composition ensures excellent tensile elongation, bending strength, and well balanced physical properties.

Description

TECHNICAL FIELD [0001] The present invention relates to a flame retardant thermoplastic resin composition and a molded article including the flame retardant thermoplastic resin composition,

The present invention relates to a flame retardant thermoplastic resin composition and a molded article containing the same. More specifically, the present invention relates to a polycarbonate-based flame retardant thermoplastic resin composition and a molded article comprising the same.

When an inorganic filler such as glass fiber is blended with a thermoplastic resin or a thermosetting resin, rigidity (bending property) such as flexural strength and flexural elasticity of the resin can be improved due to inherent characteristics of the inorganic filler. A blend of a thermoplastic resin such as polycarbonate and an inorganic filler is usually used in a molded article requiring high rigidity. Particularly, it is widely used for interior / exterior materials of automobiles, electric and electronic products which require flame retardance, impact resistance and rigidity by adding flame retardant.

However, when an inorganic filler such as glass fiber is blended in the (flame-retardant) thermoplastic resin, deterioration of fluidity (moldability) and deterioration of appearance characteristics such as protrusion of an inorganic filler on the surface of a molded article may occur. Particularly, when the resin composition (blend) is used for an exterior material such as an IT device in which appearance characteristics are important, the protrusion of the inorganic filler has been recognized as a major external quality issue. Further, at the time of injection of the resin composition, a distortion phenomenon may occur due to anisotropy of the inorganic filler. Accordingly, an attempt has been made to apply a talc having a plate-like structure capable of improving anisotropy to an inorganic filler (see Korean Patent Publication No. 2011-0059886).

However, when talc is used as the inorganic filler, the mechanical properties such as impact resistance (Izod impact strength) and tensile elongation of the thermoplastic resin composition may be deteriorated due to the brittleness of the talc, and there is a limit to be used for applications such as exterior materials .

The mechanical properties and impact resistance of the thermoplastic resin can be improved by using an inorganic filler, a coupling agent, a compatibilizing agent, or the like. However, when the content of the inorganic filler is increased, the thermoplastic resin can be easily broken at room temperature, Is difficult to prevent. Furthermore, unlike physical properties such as impact resistance and flowability, it is difficult to improve the flexural properties even if a coupling agent, a compatibilizer or the like is used.

Therefore, it is necessary to develop a flame retardant thermoplastic resin composition which is excellent in tensile elongation, flexural strength, flexural modulus, impact resistance, physical properties, and the like.

An object of the present invention is to provide a flame retardant thermoplastic resin composition excellent in tensile elongation, flexural strength, impact resistance, physical properties and the like, and a molded article comprising the flame retardant thermoplastic resin composition.

Another object of the present invention is to provide an environmentally friendly flame retardant thermoplastic resin composition and a molded article comprising the same, without using a halogen-based flame retardant.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to a thermoplastic resin composition. Wherein the thermoplastic resin composition comprises a base resin comprising a polycarbonate resin and a polysiloxane-polycarbonate copolymer resin; Impact modifiers; Phosphorus flame retardant; And an inorganic filler, wherein the inorganic filler comprises wollastonite and talc, and the wollastonite has an average diameter of 5 to 10 mu m and an aspect ratio (diameter: length) of 1: 7 to 9.

In an embodiment, the content of the impact modifier is 1 to 20 parts by weight based on 100 parts by weight of the base resin, the content of the phosphorus-based flame retardant is 1 to 40 parts by weight with respect to 100 parts by weight of the base resin, The content of the filler may be 5 to 100 parts by weight based on 100 parts by weight of the base resin.

In an embodiment, the wollastonite may have a hydrophobic surface treatment at least a portion of its surface.

In embodiments, the weight ratio of wollastonite and talc (wollastonite: talc) may be from 1: 1 to 10: 1.

In an embodiment, the impact modifier may include at least one of a core-shell graft impact modifier and a branched type graft impact modifier.

In an embodiment, the phosphorus flame retardant may be an aromatic phosphoric acid ester compound represented by the following formula (3)

(3)

Wherein R ₁ , R ₂ , R ₄ and R ₅ are each independently a hydrogen atom, a C 6 -C 20 aryl group, or a C 6 -C 20 aryl group substituted with a C 1 -C 10 alkyl group, and R ₃ is A C6-C20 arylene group or a C6-C20 arylene group substituted with a C1-C10 alkyl group, and n is an integer of 0 to 4;

In the specific examples, the thermoplastic resin composition had an Izod impact strength of 5 to 20 kgf · cm / cm measured in accordance with ASTM D256 and a measured value at 5 mm / min under ASTM D638 The tensile elongation of the 3.2 mm thick specimen may be between 5 and 20%.

Another aspect of the present invention relates to a molded article formed from the thermoplastic resin composition.

The present invention has an effect of providing an environmentally friendly flame retardant thermoplastic resin composition and a molded article comprising the flame retardant thermoplastic resin composition which are excellent in tensile elongation, flexural strength, impact resistance, physical properties and balance thereof and do not use a halogen flame retardant.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the diameter (a) and length (b) of wollastonite according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

The thermoplastic resin composition according to the present invention comprises (A) a base resin (A) containing a polycarbonate resin and (A2) a polysiloxane-polycarbonate copolymer resin, (B) an impact modifier, (C) a phosphorus- Lt; / RTI >

(A) Base resin

(A1) Polycarbonate resin

The polycarbonate resin used in the present invention is a thermoplastic polycarbonate resin. For example, the polycarbonate resin represented by the following formula (1) is reacted with a carbonate precursor such as phosgene, halogenformate, or carbonic acid diester An aromatic polycarbonate resin can be used.

[Chemical Formula 1]

In Formula 1, A represents a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted alkylidene group having 2 to 5 carbon atoms, a substituted or unsubstituted cycloalkylene group having 5 to 6 carbon atoms , A substituted or unsubstituted cycloalkylidene group having 5 to 6 carbon atoms, -CO-, -S-, or -SO ₂ -, R ₁₁ and R ₁₂ each independently represent a substituted or unsubstituted C 1 -C 30 An alkyl group, and a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and n ₁ and n ₂ are each independently an integer of 0 to 4.

The term "substituted" means that the hydrogen atom is replaced by a halogen atom, an alkyl group having 1 to 30 carbon atoms, a haloalkyl group having 1 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, a heteroaryl group having 2 to 30 carbon atoms, An alkoxy group having 1 to 20 carbon atoms, a combination of these, and the like.

Examples of the diphenols include 4,4'-biphenol, 2,2-bis (4-hydroxyphenyl) propane, 2,4-bis (4-hydroxyphenyl) Bis (3-chloro-4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) But is not limited thereto. Examples of the above diphenols include 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane or 1,1- -Hydroxyphenyl) cyclohexane can be used. Specifically, 2,2-bis (4-hydroxyphenyl) propane, also referred to as bisphenol-A, can be used.

The polycarbonate resin may be used in the form of a branched chain. For example, 0.05 to 2 mol% of a trifunctional or more polyfunctional compound, for example, trivalent or more, And further adding a compound having a phenol group. The polycarbonate resin may be used in the form of a homopolycarbonate resin, a copolycarbonate resin or a blend thereof. The polycarbonate resin may be partially or wholly substituted with an aromatic polyester-carbonate resin obtained by polymerization reaction in the presence of an ester precursor such as a bifunctional carboxylic acid.

The weight average molecular weight (Mw) of the polycarbonate resin may be 10,000 to 200,000 g / mol, for example, 15,000 to 50,000 g / mol, but is not limited thereto. The polycarbonate resin may be in the form of a mixture of two or more kinds of polycarbonate resins having different melt indexes (MI) measured under a load of 1.2 kg at 300 ° C in accordance with ISO 1133. For example, a polycarbonate resin having a melt index of 1 to 10 g / 10 min, a polycarbonate resin having a melt index of more than 10 g / 10 min and 10 min or less, and a mixture of three polycarbonate resins having a melt index of more than 40 g / Lt; / RTI > Within the above range, the moldability (injection fluidity) of the thermoplastic resin composition can be excellent.

In an embodiment, the polycarbonate resin may comprise from 10 to 99% by weight, for example from 50 to 99% by weight, of 100% by weight of the total base resin. In the above range, tensile elongation, rigidity (flexural characteristics), impact resistance, and physical properties thereof can be excellent.

(A2) Polysiloxane-polycarbonate copolymer resin

Polysiloxane-polycarbonate copolymer resins used in the present invention include polycarbonate blocks and polysiloxane blocks. But is not limited to, for example, a triblock copolymer of a polycarbonate block / polysiloxane block / polycarbonate block. As the polysiloxane-polycarbonate copolymer resin, a conventional polysiloxane-polycarbonate copolymer may be used without limitation, and examples thereof include a diphenol (aromatic dihydroxy compound) represented by Formula 1, a carbonate precursor, A polysiloxane-polycarbonate copolymer resin prepared by reacting a siloxane compound containing a compound represented by the general formula (2) can be used.

 (2)

Wherein R ₁₃ and R ₁₄ are each independently a C1-C10 alkyl group, a C6-C18 aryl group or a C1-C10 alkyl group having a halogen atom or an alkoxy group or a C6-C18 aryl group, and A is A substituted or unsubstituted C2-C20 hydrocarbon group independently substituted or unsubstituted, or a substituted or unsubstituted C2-C20 hydrocarbon group having -O- or -S-, each Y is independently a hydrogen atom, a halogen atom, a C1 (-CN), or an ester group, and m may be from 2 to 1,000, for example, from 4 to 100, and more preferably from 10 to 80. [

In embodiments, the polycarbonate-polysiloxane copolymer may comprise from 1 wt% to 99 wt% of a polycarbonate block derived from the diphenols and from 1 wt% to 99 wt% of a polysiloxane block derived from the siloxane compound. For example, from 40 wt% to 95 wt% of the polycarbonate block and from 5 wt% to 60 wt% of the polysiloxane block. The impact resistance can be excellent in the above range.

The weight average molecular weight of the polycarbonate-polysiloxane copolymer may be from 10,000 to 50,000 g / mol, for example from 15,000 to 30,000 g / mol. The polycarbonate-polysiloxane copolymer has a melt index (MI) of 5 to 40 g / 10 min, for example, 10 to 30 g / 10 min (measured at 300 ° C under a load of 1.2 kg) according to ISO 1133 Lt; / RTI > In the above range, a thermoplastic resin composition having excellent mechanical properties, injection fluidity, and physical properties balance thereof can be obtained.

The polycarbonate-polysiloxane copolymer can be prepared by a conventional method. For example, the above-mentioned diphenols, carbonate precursors and siloxane compounds can be copolymerized using interfacial condensation polymerization, emulsion polymerization and the like. As the polycarbonate-polysiloxane copolymer, for example, commercially available products such as TARFLON RC-1700 and FC-1760 available from Idemitsu may be used.

In an embodiment, the polysiloxane-polycarbonate copolymer resin may comprise 1 to 90% by weight, for example 1 to 50% by weight, of 100% by weight of the total base resin. Within this range, the tensile elongation, rigidity (flexural characteristics), impact resistance, and physical properties of the thermoplastic resin composition can be excellent.

(B) impact modifier

As the impact modifier for use in the present invention, an impact modifier used in a conventional thermoplastic resin composition can be used. For example, (b1) a core-shell graft impact modifier, (b2) a branched graft impact modifier, And the like can be used.

The core-shell graft impact modifier (b1) is formed by forming a shell by graft copolymerizing vinyl monomers on the core structure of rubber (rubbery polymer). For example, at least one of a diene rubber, an acrylate rubber, and a silicone rubber monomer is polymerized to prepare a core of a rubbery polymer, and styrene,? -Methylstyrene, halogen or alkyl substituted styrene, acrylonitrile, At least one monomer of an unsaturated compound such as acrylonitrile, C1-C8 alkyl methacrylate, C1-C8 acrylic acid alkyl ester, maleic anhydride, and C1-C4 alkyl or phenyl nucleus-substituted maleimide, And then graft copolymerizing with the polymer. Here, the content of the rubber (core) in 100 wt% of the entire graft copolymer may be 30 to 90 wt%.

Examples of the diene rubber include butadiene rubber, acrylic rubber, ethylene / propylene rubber, styrene / butadiene rubber, acrylonitrile / butadiene rubber, isoprene rubber, and ethylene-propylene-diene terpolymer (EPDM).

The acrylate rubber may be an acrylate monomer such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, hexyl methacrylate, Wherein the curing agent is selected from the group consisting of ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate or 1,4-butylene glycol dimethacrylate, Allyl methacrylate, triallyl cyanurate and the like can be used.

The silicone rubber may be one produced from cyclosiloxane or the like. The cyclosiloxane includes, for example, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, Octaphenylcyclotetrasiloxane, and the like. As the curing agent used herein, trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, or tetraethoxysilane can be exemplified.

The rubber may be a silicone-acrylate rubber such as polydimethylsiloxane / butyl acrylate rubber (PDMS / BA), but is not limited thereto.

Among the vinyl monomers forming the shell, the C1-C8 methacrylic acid alkyl esters or C1-C8 acrylic acid alkyl esters are esters of methacrylic acid or acrylic acid, respectively, monohydrides having 1 to 8 carbon atoms Examples of the esters include methacrylic acid methyl ester, methacrylic acid ethyl ester and methacrylic acid propyl ester. Specific examples thereof include methylmethacrylate (MMA) .

Examples of the branched graft impact modifier (b2) include EPM (EPM), EPR (ethylene terephthalate), EPDM, which is a ternary copolymer of ethylene and propylene diene, allylmethacrylate- Butadiene-styrene (MBS), styrene-butadiene-styrene triblock copolymer, maleic anhydride modified EPM-g-MA, maleic anhydride modified SBS- (EPDM-g-MA), all-acrylic core-shell type rubber, ethylene ethyl acrylate (EEA), styrene butadiene rubber (SBR), ethylene vinyl alcohol (EVOH), various thermoplastic elastomers, plastomers, mixtures thereof, and the like can be used, and examples thereof include, for example, EPDM, EPDM, EPIAR, maleic anhydride modified EPDM, The < RTI ID = 0.0 > Maleic anhydride-modified epials and the like can be used. Further, a carboxylic acid or a maleic anhydride may be further added to improve the performance.

In an embodiment, the content of the impact modifier may be 1 to 20 parts by weight, for example, 2 to 15 parts by weight, and more preferably 3 to 8 parts by weight, based on 100 parts by weight of the base resin. Within this range, the tensile elongation, rigidity (flexural characteristics), impact resistance, and physical properties of the thermoplastic resin composition can be excellent.

(C) Phosphorous flame retardant

As the phosphorus flame retardant used in the present invention, a conventional phosphorus flame retardant used in the flame retardant thermoplastic resin composition may be used. For example, phosphorous compounds such as phosphates, phosphonate compounds, phosphinate compounds, phosphine oxide compounds, phosphazene compounds, metal salts of these compounds, Flame retardants may be used. The phosphorus-based flame retardant may be used alone or in combination of two or more. Preferably, as the phosphorus-based flame retardant, an aromatic phosphate ester compound represented by the following formula (3) can be used.

(3)

Wherein R ₁ , R ₂ , R ₄ and R ₅ are each independently a hydrogen atom, a C 6 -C 20 (C 6 -C 20) aryl group, or a C 6 -C 20 aryl R ₃ is a C6-C20 arylene group or a C6-C20 arylene group substituted with a C1-C10 alkyl group such as resorcinol, hydroquinone, bisphenol-A, and bisphenol- And n is an integer of 0 to 4.

Non-limiting examples of the aromatic phosphoric acid ester compound represented by Formula 2 include a diarylphosphate such as diphenylphosphate, triphenylphosphate, tricresylphosphate, triazylenylphosphate, tri (2 (2,4,6-trimethylphenyl) phosphate, tri (2,4,6-trimethylphenyl) phosphate, tri (2,4,6-trimethylphenyl) , when n is 1, bisphenol-A bis (diphenyl phosphate), resorcinol bis (diphenylphosphate), resorcinol bis [bis (2,6-dimethylphenyl) phosphate], resorcinol bis [bis (2,4-ditertiary butylphenyl) phosphate], hydroquinone bis [bis (2,6-dimethylphenyl) phosphate], and hydroquinone bis [bis . The aromatic phosphoric acid ester compound may be used alone or in the form of a mixture of two or more thereof.

The phosphorus flame retardant may be contained in an amount of 1 to 40 parts by weight, for example 5 to 30 parts by weight, based on 100 parts by weight of the base resin. Within the above range, flame retardancy can be improved without deteriorating other physical properties of the thermoplastic resin composition.

(D) Inorganic filler

The inorganic filler used in the present invention includes wollastonite and talc.

The wollastonite is a calcium-based mineral and is white acicular minerals, and at least a part of the surface thereof may be subjected to a hydrophobic surface treatment. Here, the hydrophobic surface treatment may be, for example, coating of wollastonite with an olefin-based, epoxy-based, silane-based material or the like, but is not limited thereto.

The wollastonite used in the present invention may have an average diameter of 5 to 10 mu m, for example, 6 to 9 mu m and an aspect ratio (diameter (a): length (b)) of 1: 7 to 1: 9 Reference). If the average diameter (a) of the wollastonite is less than 5 탆, the rigidity (bending property) of the thermoplastic resin composition may deteriorate. If it exceeds 10 탆, the impact resistance of the thermoplastic resin composition may decrease. If the aspect ratio of the wollastonite is less than 1: 7, the rigidity (bending property) of the thermoplastic resin composition may decrease. If the aspect ratio exceeds 1: 9, the impact resistance of the thermoplastic resin composition may decrease.

As the talc, a conventional talc of a plate shape can be used. The average particle size of the talc may be from 2 to 7 mu m, for example from 3 to 5 mu m. The rigidity (bending property) of the thermoplastic resin composition in the above range can be excellent.

In an embodiment, the wollastonite and the talc may be a commercially available product satisfying the conditions such as the size.

In embodiments, the weight ratio of wollastonite and talc (wollastonite: talc) may be from 1: 1 to 10: 1, for example from 1: 1 to 3: 1. In the above range, the anisotropy problem (the problem that the MD and TD shrinkage ratio is different due to the orientation of the filler and the warpage of the article to be warped) is improved, and the rigidity (bending property) of the thermoplastic resin composition can be excellent.

The content of the inorganic filler may be 5 to 100 parts by weight, for example 5 to 70 parts by weight, based on 100 parts by weight of the base resin. Within the above range, tensile elongation, impact resistance, rigidity (flexural characteristics), and physical properties thereof can be excellent without deteriorating other physical properties of the thermoplastic resin composition.

The thermoplastic resin composition according to the present invention may further contain conventional additives as required. Examples of the additives include, but are not limited to, antioxidants, antifoaming agents, lubricants, release agents, nucleating agents, antistatic agents, stabilizers, pigments, dyes, and mixtures thereof. When the additive is used, the content thereof may be 0.01 to 10 parts by weight based on 100 parts by weight of the thermoplastic resin, but is not limited thereto.

In a specific example, the thermoplastic resin composition of the present invention has an Izod impact strength of 5 to 20 kgf · cm / cm, for example, 5 to 10 kgf · cm / cm, measured according to ASTM D256 .

The thermoplastic resin composition may have a tensile elongation of 5 to 20%, for example 8 to 15%, of 3.2 mm thick specimens measured at 5 mm / min according to ASTM D638.

The molded article according to the present invention is formed from the thermoplastic resin composition. The thermoplastic resin composition of the present invention can be produced by a known method for producing a thermoplastic resin composition. For example, after mixing the above components and other additives as necessary, they may be melt-extruded in an extruder to produce pellets. The produced pellets can be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those of ordinary skill in the art to which the present invention pertains. The molded article is excellent in flame retardancy, impact resistance, mechanical properties, physical properties, and the like, and thus is useful as an automobile part, a part of an electric and electronic product, a facade material, and the like. Preferably, it can be used for a notebook exterior article.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Example

The specifications of each component used in the following examples and comparative examples are as follows:

(A) Base resin

(A1) Polycarbonate resin

(PC-1) An aromatic polycarbonate resin (manufactured by Samyang Corp.) having a melt index (MI) of 5 g / 10 min measured under a load of 1.2 kg at 300 ° C under a load of ISO 1133 was used.

(PC-2) A bisphenol-A polycarbonate resin (manufactured by Cheil Industries) having a melt index of 20 g / 10 min measured under a load of 1.2 kg at 300 캜 under the ISO 1133 was used.

(PC-3) Bisphenol-A aromatic polycarbonate resin (manufactured by Cheil Industries) having a melt index of 62 g / 10 min measured under a load of 1.2 kg at 300 ° C under ISO 1133 was used.

(A2) Polysiloxane-polycarbonate copolymer resin (Si-PC)

Polysiloxane-polycarbonate copolymer resin (manufactured by Idemitsu) having a melt index of 20 g / 10 min measured under a load of 1.2 kg at 300 캜 under ISO 1133 was used.

(B) impact modifier

An impact modifier (manufactured by MRC, product name: S-2001) having a core made of PDMS / BA and a shell made of MMA was used.

(C) Phosphorous flame retardant

Bisphenol-A bis (diphenylphosphate) (BDP, manufacturer: DAIHACHI, product name: CR-741) was used.

(D) Inorganic filler

(D1) Wollastonite

(NYCO, product name: NYGLOS 4W) having an average particle size (diameter x length) of 7 mu m x 63 mu m (aspect ratio (diameter: length) = 1: 9) was used.

(NYCO, product name: NYGLOS 8) having an average particle size (diameter x length) of 12 占 퐉 占 156 占 퐉 (aspect ratio (diameter: length) = 1: 13)

(NYCO: product name: NYGLOS 12) having an average particle size (diameter x length) of 15 mu m x 150 mu m (aspect ratio (diameter: length) = 1:10)

(NYCO: product name: NYGLOS 20) having an average particle size (diameter x length) of 30 mu m x 300 mu m (aspect ratio (diameter: length) = 1:10)

(D2) Talc

A plate-shaped talc (manufacturer: HAYASHI, product name: UPN HS-T 0.5) was used.

Example 1 and Comparative Examples 1 to 3

The above components were added to a twin screw type extruder having an L / D ratio of 44 and a diameter of 45 mm, and then melted and extruded at 250 DEG C and a stirring speed of 250 rpm according to the composition and content of Table 1, . The prepared pellets were dried at 80 DEG C for 5 hours or more, and then ejected from a screw extruder (150 tons single injector) at 240 to 280 DEG C to prepare specimens. The properties of the prepared specimens were evaluated by the following methods, and the results are shown in Table 1 below.

How to measure property

(1) IZOD Impact Strength (Unit: kgf. Cm / cm): Based on the evaluation method defined in ASTM D256, a notch was formed on a 1/8 "thick Izod sample to evaluate it.

(2) Tensile elongation (unit:%): Measured according to ASTM D638 on a 3.2 mm thick specimen at 5 mm / min.

(3) Spiral flow: Molding temperature 300 ° C, mold temperature 60 ° C, injection pressure 1,500 kg / cm ² , injection speed 120 mm / s, injection molding machine (manufacturer: LS Mtron, And the length (mm) of the injection molding was measured by injection molding into a spiral mold having a thickness of 2 mm.

(4) Flexural Strength (Unit: kgf / cm ² ): Measured according to ASTM D790 for a specimen 3.2 mm thick at 2.8 mm / min.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 (A) (A1) PC-1 (% by weight) 50 50 50 50 PC-2 (% by weight) 12 12 12 12 PC-3 (wt%) 28 28 28 28 (A2) Si-PC (% by weight) 10 10 10 10 (B) (parts by weight) 6 6 6 6 (C) (parts by weight) 19 19 19 19 (D1) Kinds NYGLOS 4W NYGLOS 8 NYGLOS 12 NYGLOS 20 Weight portion 37.7 37.7 37.7 37.7 (D2) (parts by weight) 5.1 5.1 5.1 5.1 Izod impact strength
(kgf · cm / cm) 8.6 7.6 6.8 5.7 Tensile elongation (%) 10.3 7.3 5.9 4.6 Spiral Flow (mm) 225 215 217 207 Flexural Strength (kgf / cm ² ) 58995 56634 57817 58557

(Parts by weight: parts by weight based on 100 parts by weight of the base resin (A)

From the above results, it can be seen that the flame retardant thermoplastic resin composition according to the present invention has excellent impact resistance (Izod impact strength), tensile elongation and flexural strength, and excellent spiral flow (moldability) during injection molding .

On the other hand, in the case of the comparative example, it is found that the impact resistance, tensile elongation and the like are lowered.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

100 parts by weight of a base resin comprising a polycarbonate resin and a polysiloxane-polycarbonate copolymer resin;
1 to 20 parts by weight of an impact modifier;
1 to 40 parts by weight of phosphorus-based flame retardant; And
5 to 100 parts by weight of an inorganic filler,
(Wollastonite: talc) of 1: 1 to 10: 1, the wollastonite has an average diameter of 5 to 10 mu m, an aspect ratio (diameter: length) Is 1: 7 to 9,
And the tensile elongation of the 3.2 mm thick specimen measured under the condition of 5 mm / min according to ASTM D638 is 8 to 20%.
The thermoplastic resin composition according to claim 1, wherein at least part of the surface of the wollastonite is subjected to a hydrophobic surface treatment.
The thermoplastic resin composition according to claim 1, wherein the impact modifier comprises at least one of a core-shell graft impact modifier and a branched type graft impact modifier.
The thermoplastic resin composition according to claim 1, wherein the phosphorus flame retardant is an aromatic phosphate ester compound represented by the following formula (3)
(3)

Wherein R ₁ , R ₂ , R ₄ and R ₅ are each independently a hydrogen atom, a C 6 -C 20 aryl group, or a C 6 -C 20 aryl group substituted with a C 1 -C 10 alkyl group, and R ₃ is A C6-C20 arylene group or a C6-C20 arylene group substituted with a C1-C10 alkyl group, and n is an integer of 0 to 4;
The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has an Izod impact strength of 5 to 20 kgf · cm / cm in a 1/8 "thick specimen measured according to ASTM D256.
A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 5.

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