Polypropylene resin composition and molded article produced therefrom

Abstract

A polypropylene resin composition of the present invention comprises: about 100 parts by weight of a polypropylene resin; about 65 to about 115 parts by weight of a phosphorus nitrogen-based flame retardant; about 25 to about 67 parts by weight of maleic anhydride-modified polypropylene having a maleic anhydride content of about 0.8 to about 1.5 wt%; and about 45 to about 125 parts by weight of glass fibers. The polypropylene resin composition exhibits excellent flame retardancy, impact resistance, rigidity, thermal stability, a balanced combination of these properties, etc.

Description

Polypropylene resin composition and molded article manufactured therefrom

[0001] The present invention relates to a polypropylene resin composition and a molded article manufactured therefrom. More specifically, the present invention relates to a non-halogen flame-retardant polypropylene resin composition having excellent flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and a molded article manufactured therefrom.

[0002]

[0003] Polypropylene resin has excellent chemical resistance, weather resistance, and processability, making it easy to manufacture into injection-molded products, films, and blow-molded products. It is a material widely used in fields such as automobiles, construction materials, and electrical components.

[0004] Since polypropylene resin is a flammable substance due to its chemical structure, various organic or inorganic flame retardants are added in combination to impart flame-retardant properties. However, with the growing concern for environmental issues, regulations on existing halogen-based flame retardants are gradually becoming stricter; consequently, to use polypropylene resin compositions as eco-friendly materials, the reduction or exclusion of halogen-based flame retardants and anti-dripping agents is required.

[0005] However, if conventional flame-retardant thermoplastic resin compositions are excluded from drip prevention agents, it is difficult to obtain the 5V high flame-retardant rating due to dripping of specimens during UL94 testing. In particular, conventional glass fiber reinforced polypropylene resin compositions have high fluidity and high specific gravity, so it is difficult to obtain the high flame-retardant rating without a drip prevention agent.

[0006] Therefore, there is a need to develop a non-halogen flame-retardant polypropylene resin composition that exhibits excellent flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties.

[0007] The background technology of the present invention is disclosed in Korean registered patent No. 10-1863421, etc.

[0008]

[0009] The objective of the present invention is to provide a non-halogen flame-retardant polypropylene resin composition having excellent flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties.

[0010] Another objective of the present invention is to provide a molded article formed from the polypropylene resin composition.

[0011] The above and other objectives of the present invention can all be achieved by the present invention described below.

[0012]

[0013] 1. One aspect of the present invention relates to a polypropylene resin composition. The polypropylene resin composition comprises about 100 parts by weight of polypropylene resin; about 65 to about 115 parts by weight of a phosphino-nitrogen flame retardant; about 25 to about 67 parts by weight of maleic anhydride-modified polypropylene having a maleic anhydride content of about 0.8 to about 1.5% by weight; and about 45 to about 125 parts by weight of glass fiber.

[0014] 2. In the above 1 embodiment, the polypropylene resin may include one or more of homopolypropylene resin, block polypropylene resin, and random polypropylene resin.

[0015] 3. In the above 1 or 2 embodiments, the phosphino-based flame retardant may include one or more of piperazine pyrophosphate, melamine phosphate, melamine polyphosphate, melam pyrophosphate, melem pyrophosphate, melon pyrophosphate, melamine pyrophosphate, dimelamine pyrophosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, and ammonium polyphosphate.

[0016] 4. In the above 1 to 3 embodiments, the maleic anhydride modified polypropylene may have a melt-flow index of about 50 to about 130 g / 10 min measured at 230°C and a 2.16 kg load according to ASTM D1238.

[0017] 5. In the above 1 to 4 embodiments, the weight ratio of the phosphino-nitrogen-based flame retardant and the maleic anhydride-modified polypropylene may be about 1:0.3 to about 1:0.9.

[0018] 6. In the above 1 to 5 embodiments, the weight ratio of the phosphino-nitrogen-based flame retardant and the glass fiber may be about 1:0.4 to about 1:1.6.

[0019] 7. In the above 1 to 6 embodiments, the weight ratio of the maleic anhydride-modified polypropylene and the glass fiber may be about 1:1 to about 1:3.

[0020] 8. In the above 1 to 7 embodiments, the polypropylene resin composition may have a flame retardancy of V-0 or higher for a 1.5 mm thick injection molded specimen measured by the UL-94 vertical test method.

[0021] 9. In the above 1 to 8 embodiments, the polypropylene resin composition may have a 5V flame retardancy of 5V or higher for a 2.5 mm thick injection molded specimen measured by the UL94 5V burning test method.

[0022] 10. In the above 1 to 9 embodiments, the polypropylene resin composition may have a notched Izod impact strength of about 6 to about 20 kgf·cm / cm of a 1 / 8" thick specimen measured according to ASTM D256.

[0023] 11. In the above embodiments 1 to 10, the polypropylene resin composition has a tensile strength of about 590 to about 1,200 kgf / cm² of a 3.2 mm thick specimen measured at 5 mm / min in accordance with ASTM D638. 2 It could be.

[0024] 12. In the above 1 to 11 embodiments, the polypropylene resin composition may have a heat distortion temperature (HDT) of about 158 ​​to about 170°C for a specimen of size 80 mm × 10 mm × 4 mm measured under conditions of 0.45 MPa and a heating rate of 120°C / hr in accordance with ISO 75.

[0025] 13. Another aspect of the present invention relates to a molded article. The molded article is characterized by being formed from a polypropylene resin composition according to any one of 1 to 12.

[0026]

[0027] The present invention has the effect of providing a non-halogen flame-retardant polypropylene resin composition having excellent flame retardancy, impact resistance, rigidity, thermal stability, and a balance of physical properties thereof, and a molded article formed therefrom.

[0028]

[0029] The present invention will be described in detail below.

[0030] The polypropylene resin composition according to the present invention comprises (A) polypropylene resin; (B) a phosphate-nitrogen-based flame retardant; (C) maleic anhydride-modified polypropylene; and (D) glass fiber.

[0031] In this specification, "a to b" indicating a numerical range is defined as "≥a and ≤b".

[0032]

[0033] (A) Polypropylene resin

[0034] A polypropylene resin according to one embodiment of the present invention is applied together with a phosphino-nitrogen-based flame retardant, a specific maleic anhydride-modified polypropylene, and glass fibers, and can improve the flame retardancy, impact resistance, stiffness, thermal stability, and balance of physical properties of a polypropylene resin composition without the application of a halogen-based flame retardant and a drip prevention agent, and can use a polypropylene resin applied to a conventional polypropylene resin composition.

[0035] In a specific example, the polypropylene resin may include one or more of homopolypropylene resin, block polypropylene resin, and random polypropylene resin. Here, the block polypropylene resin may be a block polypropylene resin composed of a homopolypropylene block, an ethylene-propylene copolymer block, and / or a homopolyethylene block, and the random polypropylene resin may be a propylene-ethylene random copolymer. For example, the polypropylene resin may be a block polypropylene resin, etc.

[0036] In a specific example, the polypropylene resin may have a Melt-flow Index (MI) of about 10 to about 100 g / 10 min, for example, about 10 to about 35 g / 10 min, measured according to ASTM D1238 under conditions of 230°C and a 2.16 kg load. Within this range, the mechanical properties and moldability of the polypropylene resin composition may be excellent.

[0037]

[0038] (B) Phosphate-based flame retardant

[0039] A phosphino-nitrogen-based flame retardant according to one embodiment of the present invention is applied together with polypropylene resin, specific maleic anhydride-modified polypropylene, glass fiber, etc., and can improve the flame retardancy, impact resistance, stiffness, thermal stability, and balance of physical properties of a polypropylene resin composition without the application of halogen-based flame retardants and drip prevention agents, and can use a phosphino-nitrogen-based flame retardant used in conventional thermoplastic resin compositions.

[0040] In a specific example, the phosphinidio-based flame retardant may include piperazine pyrophosphate, melamine phosphate, melamine polyphosphate, melam pyrophosphate, melem pyrophosphate, melon pyrophosphate, melamine pyrophosphate, dimelamine pyrophosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium polyphosphate, combinations thereof, and multiple salts thereof. For example, the phosphinidio-based flame retardant may include melamine phosphate, melamine polyphosphate, piperazine pyrophosphate, combinations thereof.

[0041] In a specific example, the phosphino-based flame retardant may comprise piperazine pyrophosphate in an amount of about 40 to about 85 weight%, for example, about 45 to about 80 weight%, and melamine polyphosphate in an amount of about 15 to about 60 weight%, for example, about 20 to about 55 weight%.

[0042] In a specific example, the phosphino-nitrogen-based flame retardant may be included in an amount of about 65 to about 115 parts by weight, for example, about 70 to about 110 parts by weight, with respect to about 100 parts by weight of the polypropylene resin. If the content of the phosphino-nitrogen-based flame retardant is less than about 65 parts by weight with respect to about 100 parts by weight of the polypropylene resin, there is a risk that the flame retardancy of the polypropylene resin composition may be reduced, and if it exceeds about 115 parts by weight, there is a risk that the impact resistance, rigidity and / or thermal stability of the polypropylene resin composition may be reduced.

[0043]

[0044] (C) Maleic anhydride modified polypropylene

[0045] Maleic anhydride modified polypropylene according to one embodiment of the present invention can be applied together with polypropylene resin, a phosphino-nitrogen flame retardant, and glass fibers, and can improve the flame retardancy, impact resistance, stiffness, thermal stability, and balance of physical properties of the polypropylene resin composition without the application of a halogen flame retardant and a drip prevention agent. Maleic anhydride modified polypropylene obtained by (graft) polymerizing maleic anhydride into polypropylene with a content of about 0.8 to about 1.5 weight% can be used.

[0046] In a specific example, the maleic anhydride modified polypropylene may have a maleic anhydride content of about 0.8 to about 1.5 weight%, for example, about 0.8 to about 1.4 weight%. If the maleic anhydride content of the maleic anhydride modified polypropylene is less than about 0.8 weight%, there is a risk that the flame retardancy, mechanical properties, etc. of the polypropylene resin composition will be reduced, and if it exceeds about 1.5 weight%, there is a risk that the impact resistance, stiffness, etc. of the polypropylene resin composition will be reduced.

[0047] In a specific example, the maleic anhydride-modified polypropylene may have a melt-flow index of about 50 to about 130 g / 10 min, for example, about 80 to about 120 g / 10 min, measured according to ASTM D1238 under conditions of 230°C and a 2.16 kg load. Within this range, the flame retardancy and mechanical properties of the polypropylene resin composition may be excellent.

[0048] In a specific example, the maleic anhydride-modified polypropylene may be included in an amount of about 25 to about 67 parts by weight, for example, about 33 to about 65 parts by weight, with respect to about 100 parts by weight of the polypropylene resin. If the content of the maleic anhydride-modified polypropylene is less than about 25 parts by weight with respect to about 100 parts by weight of the polypropylene resin, there is a risk that the flame retardancy, rigidity, and / or impact resistance of the polypropylene resin composition may be reduced, and if it exceeds about 67 parts by weight, there is a risk that the flame retardancy, etc. of the polypropylene resin composition may be reduced.

[0049] In a specific example, the weight ratio of the phosphino-nitrogen-based flame retardant and the maleic anhydride-modified polypropylene may be about 1:0.3 to about 1:0.9, for example, about 1:0.35 to about 1:0.75. Within this range, the flame retardancy, impact resistance, rigidity, etc. of the polypropylene resin composition may be superior.

[0050]

[0051] (D) Glass fiber

[0052] Glass fibers according to one embodiment of the present invention can be applied together with polypropylene resin, a phosphino-nitrogen-based flame retardant, and a specific maleic anhydride-modified polypropylene, and can improve the flame retardancy, impact resistance, stiffness, thermal stability, and balance of physical properties of a polypropylene resin composition without the application of a halogen-based flame retardant and a drip prevention agent, and can use glass fibers used in conventional thermoplastic resin compositions.

[0053] In a specific embodiment, the glass fiber may have various forms such as fibrous, granular, rod-shaped, needle-shaped, flake-shaped, or amorphous, and may have cross-sections of various shapes such as circular, elliptical, or rectangular. For example, using fibrous glass fibers with circular and / or rectangular cross-sections may be preferable in terms of mechanical properties.

[0054] In a specific example, the glass fiber with a circular cross-section may have a cross-sectional diameter of about 5 to about 20 μm as measured by a particle size analyzer and a length of about 2 to about 20 mm before processing, and the glass fiber with a rectangular cross-section may have a cross-sectional aspect ratio (ratio of the short diameter of the cross-section to the long diameter of the cross-section) of about 1.5 to about 10 as measured by a particle size analyzer, a cross-sectional short diameter of about 2 to about 10 μm, and a length of about 2 to about 20 mm before processing. Within the above range, the mechanical properties, moldability, etc. of the polypropylene resin composition may be improved.

[0055] In a specific example, the glass fiber may be included in an amount of about 45 to about 125 parts by weight, for example, about 50 to about 120 parts by weight, with respect to about 100 parts by weight of the polypropylene resin. If the content of the glass fiber is less than about 45 parts by weight with respect to about 100 parts by weight of the polypropylene resin, there is a risk that the flame retardancy, rigidity, etc. of the polypropylene resin composition may decrease, and if it exceeds about 125 parts by weight, the moldability, etc. of the polypropylene resin composition may decrease, making it difficult to manufacture a molded article.

[0056] In a specific example, the weight ratio of the phosphino-nitrogen-based flame retardant and the glass fiber may be about 1:0.4 to about 1:1.6, for example, about 1:0.5 to about 1:1.4. Within this range, the flame retardancy, impact resistance, rigidity, moldability, etc. of the polypropylene resin composition may be superior.

[0057] In a specific example, the weight ratio of the maleic anhydride-modified polypropylene and the glass fiber may be about 1:1 to about 1:3, for example, about 1:1.1 to about 1:2.7. Within this range, the flame retardancy, impact resistance, rigidity, moldability, etc. of the polypropylene resin composition may be superior.

[0058]

[0059] A polypropylene resin composition according to one embodiment of the present invention may further include additives included in a conventional polypropylene resin composition. Examples of said additives include, but are not limited to, antioxidants, surfactants, lubricants, release agents, nucleating agents, stabilizers, pigments, dyes, and mixtures thereof.

[0060] In a specific example, when using the above additive, the content may be about 0.001 to about 40 parts by weight, for example, about 0.1 to about 10 parts by weight, with respect to about 100 parts by weight of the polypropylene resin.

[0061]

[0062] A polypropylene resin composition according to one embodiment of the present invention may be in the form of pellets produced by mixing the above components and melt-extruding them using a conventional twin-screw extruder at about 180 to about 280°C, for example, about 200 to about 260°C.

[0063] In a specific example, the polypropylene resin composition may have a flame retardancy of V-0 or higher for a 1.5 mm thick injection molded specimen measured by the UL-94 vertical test method.

[0064] In a specific example, the polypropylene resin composition may have a 5V flame retardancy of 5V or higher, for example, 5VB or 5VA, of a 2.5 mm thick injection molded specimen measured by the UL-94 5V burning test method.

[0065] In a specific example, the polypropylene resin composition may have a notched Izod impact strength of a 1 / 8" thick specimen measured according to ASTM D256 of about 6 to about 20 kgf·cm / cm, for example, about 7 to about 15 kgf·cm / cm.

[0066] In a specific example, the polypropylene resin composition has a tensile strength of about 590 to about 1,200 kgf / cm² of a 3.2 mm thick specimen measured at 5 mm / min in accordance with ASTM D638. 2 , for example, about 600 to about 1,150 kgf / cm² 2 It could be.

[0067] In a specific example, the polypropylene resin composition may have a heat distortion temperature (HDT) of an 80 mm × 10 mm × 4 mm specimen measured under conditions of 0.45 MPa and a heating rate of 120°C / hr according to ISO 75, which is about 158 ​​to about 170°C, for example, about 160 to about 165°C.

[0068]

[0069] The molded article according to the present invention is formed from the polypropylene resin composition. The polypropylene resin composition may be manufactured in the form of pellets, and the manufactured pellets may 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 skilled in the art to which the present invention pertains.

[0070] In a specific example, the molded product has excellent flame retardancy, impact resistance, rigidity, thermal stability, and a balance of these physical properties, and is therefore useful as an interior or exterior material for electrical and electronic products, such as a power box material or a motor housing material.

[0071]

[0072] The present invention is to be explained more specifically through the following examples, but these examples are for illustrative purposes only and should not be interpreted as limiting the invention.

[0073]

[0074] Examples

[0075] The specifications of each component used in the examples and comparative examples below are as follows.

[0076] (A) Polypropylene resin

[0077] Block polypropylene resin (Manufacturer: Lotte Chemical, Product Name: JSS-370N) was used.

[0078] (B) Phosphate-based flame retardant

[0079] Melamine phosphate (Manufacturer: Presafer, Product name: EPFR-110DN) was used.

[0080] (C) Maleic anhydride modified polyolefin

[0081] (C1) Maleic anhydride modified polypropylene (Manufacturer: Chemco Precision, Product name: CHEMS MP600PP, Maleic anhydride content: 1.0 wt%) was used.

[0082] (C2) Maleic anhydride modified polypropylene (Manufacturer: Chemco Precision, Product name: CHEMS MP120PP, Maleic anhydride content: 0.7 wt%) was used.

[0083] (C3) Maleic anhydride modified polypropylene (Manufacturer: Sigma-Aldrich, Product name: Polypropylene-graft-maleic anhydride (427845), Maleic anhydride content: 10 wt%) was used.

[0084] (D) Glass fiber

[0085] Glass fiber (Manufacturer: KCC, Product Name: CS411) was used.

[0086]

[0087] Examples 1 to 10 and Comparative Examples 1 to 11

[0088] Each of the above components was added in the amounts listed in Tables 1, 2, 3, and 4 below, and pellets were prepared by extrusion at approximately 210°C. A twin-screw extruder with L / D=36 and a diameter of 45 mm was used for extrusion. The prepared pellets were dried at approximately 80°C for at least 2 hours, and then injection molded in a 6 oz injection molding machine (molding temperature: approximately 210°C, mold temperature: approximately 60°C) to produce specimens. The physical properties of the prepared specimens were evaluated by the following method, and the results are shown in Tables 1, 2, 3, and 4 below.

[0089]

[0090] Methods for measuring physical properties

[0091] (1) Flame retardancy evaluation: The flame retardancy of a 1.5 mm thick injection molded specimen was measured using the UL-94 vertical test method.

[0092] (2) Evaluation of flame retardancy (5V standard): The 5V flame retardancy of a 2.5 mm thick injection molded specimen was measured using the UL-94 5V burning test method.

[0093] (3) Notched Izod impact strength (unit: kgf·cm / cm): According to ASTM D256, the notched Izod impact strength of a 1 / 8" thick specimen was measured.

[0094] (4) Tensile strength (unit: kgf / cm²) 2 In accordance with ASTM D638, the tensile strength of a 3.2 mm thick specimen was measured at 5 mm / min.

[0095] (5) Heat distortion temperature (unit: ℃): According to ISO 75, the heat distortion temperature (HDT) of a specimen of size 80 mm × 10 mm × 4 mm was measured under conditions of 0.45 MPa and a heating rate of 120℃ / hr.

[0096]

[0097] Example 1 2345(A) (parts by weight) 100 100 100 100 100 (B) (parts by weight) 70 80 95 110 85 (C1) (parts by weight) 33 5 140 65 45 (C2) (parts by weight) -----(C3) (parts by weight) -----(D) (parts by weight) 52 60 102 120 85 Flame Retardancy V - 0 V - 0 V - 0 V - 0 V - 0 V - 5 V Flame Retardancy 5 V 5 V 5 V 5 V 5 V Notched Izod Impact Strength 77 897 Tensile Strength 60 630 1,000 1,100 920 Heat Deformation Temperature 160 160 161 161 161

[0098]

[0099] Example 678910(A) (parts by weight) 100100100100100(B) (parts by weight) 11090909090(C1) (parts by weight) 4545654545(C2) (parts by weight)-----(C3) (parts by weight)-----(D) (parts by weight) 85858558120 Flame Retardancy V-0V-0V-0V-0V-0V-05V Flame Retardancy 5VA5VA5VA5VA5VA Notched Izod Impact Strength 77778 Tensile Strength 8309308506101,050 Heat Deformation Temperature 161162160160161

[0100]

[0101] Comparative Example 12345(A) (parts by weight) 100 100 100 100 100 (B) (parts by weight) 60 120 120 80 95(C1) (parts by weight) 51 51 40 20 20(C2) (parts by weight) -----(C3) (parts by weight) -----(D) (parts by weight) 60 60 102 60 102 Flame Retardancy Fail V - 0 V - 0 Fail V - 0 5 V Flame Retardancy Fail 5 VA 5 VA Fail Fail Notch Izod Impact Strength 94 56 7 Tensile Strength 60 55 50 90 0 35 0 1,000 Heat Deformation Temperature 16 21 55 159 16 0 16 1

[0102]

[0103] Comparative Example 67891011(A) (parts by weight) 100100100100100100100(B) (parts by weight) 809590908095(C1) (parts by weight) 7070--5140(C2) (parts by weight)--45---(C3) (parts by weight)---45--(D) (parts by weight) 60102858540130 Flame Retardancy V-0V-0V-0V-0V-0V-0-5V Flame Retardancy FailFailFail5VAFail-Notch Izod Impact Strength 78637-Tensile Strength 650900650590430-Thermal Deformation Temperature 160160160163160-

[0104]

[0105] From the above results, it can be seen that the polypropylene resin composition of the present invention has excellent flame retardancy (flame retardancy and 5V flame retardancy), impact resistance (notched Izod impact strength), stiffness (tensile strength), thermal stability (heat distortion temperature), etc.

[0106] On the other hand, in Comparative Example 1, where the content of the phosphino-nitrogen-based flame retardant is less than the range of the present invention, it can be seen that the flame retardancy is reduced, and in Comparative Examples 2 and 3, where the content of the phosphino-nitrogen-based flame retardant exceeds the range of the present invention, it can be seen that the impact resistance, rigidity and / or thermal stability, etc. are reduced.

[0107] In Comparative Examples 4 and 5, the content of maleic anhydride modified polypropylene is less than the range of the present invention, it can be seen that flame retardancy and / or rigidity are reduced; in Comparative Examples 6 and 7, the content of maleic anhydride modified polypropylene is greater than the range of the present invention, it can be seen that flame retardancy is reduced; in Comparative Example 8, maleic anhydride modified polypropylene (C2), in which the content of maleic anhydride is less than the range of the present invention, is applied instead of the maleic anhydride modified polypropylene of the present invention, it can be seen that flame retardancy is reduced; and in Comparative Example 9, maleic anhydride modified polypropylene (C3), in which the content of maleic anhydride is greater than the range of the present invention, is applied, it can be seen that impact resistance is reduced.

[0108] In addition, in the case of Comparative Example 10, in which the glass fiber content is less than the range of the present invention, it can be seen that flame retardancy, rigidity, etc. are reduced, and in the case of Comparative Example 11, in which the glass fiber content exceeds the range of the present invention, moldability, etc. is reduced, so a specimen for which physical properties can be measured cannot be obtained.

[0109]

[0110] The present invention has been described above with reference to embodiments. Those skilled in the art will understand that the present invention may be embodied in modified forms without departing from the essential characteristics of the invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the invention is defined by the claims, not by the foregoing description, and all variations within the scope of equivalents should be interpreted as being included in the invention.

Claims

1. 100 parts by weight of polypropylene resin; 65 to 115 parts by weight of phosphinizo-based flame retardant; 25 to 67 parts by weight of maleic anhydride-modified polypropylene having a maleic anhydride content of 0.8 to 1.5 weight%; and A polypropylene resin composition characterized by comprising 45 to 125 parts by weight of glass fibers.

2. A polypropylene resin composition according to claim 1, characterized in that the first polypropylene resin comprises one or more of homopolypropylene resin, block polypropylene resin, and random polypropylene resin.

3. The polypropylene resin composition according to claim 1, wherein the phosphino-nitrogen-based flame retardant comprises one or more of piperazine pyrophosphate, melamine phosphate, melamine polyphosphate, melam pyrophosphate, melem pyrophosphate, melon pyrophosphate, melamine pyrophosphate, dimelamine pyrophosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, and ammonium polyphosphate.

4. A polypropylene resin composition according to claim 1, characterized in that the maleic anhydride-modified polypropylene has a melt-flow index of 50 to 130 g / 10 min measured at 230°C and a 2.16 kg load condition in accordance with ASTM D1238.

5. A polypropylene resin composition according to claim 1, characterized in that the weight ratio of the phosphino-nitrogen-based flame retardant and the maleic anhydride-modified polypropylene is 1:0.3 to 1:0.

9.

6. A polypropylene resin composition according to claim 1, characterized in that the weight ratio of the phosphino-nitrogen-based flame retardant and the glass fiber is 1:0.4 to 1:1.

6.

7. A polypropylene resin composition according to claim 1, characterized in that the weight ratio of the maleic anhydride-modified polypropylene and the glass fiber is 1:1 to 1:

3.

8. The polypropylene resin composition according to claim 1, characterized in that the polypropylene resin composition has a flame retardancy of V-0 or higher for a 1.5 mm thick injection molded specimen measured by the UL-94 vertical test method.

9. The polypropylene resin composition according to claim 1, characterized in that the 5V flame retardancy of a 2.5 mm thick injection molded specimen measured by the UL94 5V burning test method is 5VB or higher.

10. The polypropylene resin composition according to claim 1, characterized in that the polypropylene resin composition has a notched Izod impact strength of 6 to 20 kgf·cm / cm of a 1 / 8" thick specimen measured according to ASTM D256.

11. In claim 1, the polypropylene resin composition has a tensile strength of 590 to 1,200 kgf / cm² of a 3.2 mm thick specimen measured at 5 mm / min in accordance with ASTM D638. 2 A polypropylene resin composition characterized by being.

12. The polypropylene resin composition according to claim 1, characterized in that the heat distortion temperature (HDT) of a specimen of size 80 mm × 10 mm × 4 mm, measured under conditions of 0.45 MPa and a heating rate of 120℃ / hr in accordance with ISO 75, is 158 to 170℃.

13. A molded article characterized by being formed from a polypropylene resin composition according to any one of claims 1 to 12.