WO2025053502A1 - Polypropylene resin composition and article produced therefrom - Google Patents

Abstract

A polypropylene resin composition of the present invention comprises: about 100 parts by weight of a polypropylene resin; about 0.3-5 parts by weight of an aromatic phosphate compound; about 1-10 parts by weight of a phosphorus nitrogen-based compound; about 0.01-0.15 parts by weight of a bromine-based compound; and about 0.2-1 parts by weight of 1,1-(1,1,2,2-tetramethylethylene)dibenzene. The polypropylene resin composition has excellent flame retardancy, impact resistance, rigidity, heat resistance, eco-friendliness, extrusion moldability, productivity, and the like.

Description

Polypropylene resin composition and molded article manufactured therefrom

The present invention relates to a polypropylene resin composition and a molded article manufactured therefrom. More specifically, the present invention relates to a polypropylene resin composition having excellent flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, etc., and a molded article manufactured therefrom.

Polypropylene resin has excellent chemical resistance, weather resistance, and processability, and is easy to manufacture in the form of injection molded products, films, and blow molded products. It is a material widely used in fields such as electrical components, automobiles, and building materials.

However, since polypropylene resin has a chemical structure that makes it flammable and difficult to self-extinguish, in order to use a polypropylene resin composition as a flame retardant material, flame retardants such as halogen-based flame retardants, inorganic flame retardants, and phosphorus-based flame retardants must be added to provide flame retardant performance.

Among these flame retardants, halogen-based flame retardants (especially brominated flame retardants) are used together with antimony trioxide as a synergistic agent, and antimony trioxide is managed as a hazardous substance and its use is restricted. In addition, since inorganic flame retardants must be used in high content to provide flame retardancy, they have the disadvantage of significantly reducing other physical properties of the material. Accordingly, phosphorus-based flame retardants, which are not harmful compared to halogen-based flame retardants and have less property degradation compared to inorganic flame retardants, are mainly applied to general flame retardant materials; however, there is a concern that the desired flame retardant performance may not be obtained if phosphorus-based flame retardants are applied alone.

Accordingly, there is a need to develop an environmentally friendly polypropylene resin composition that has excellent flame retardancy, impact resistance, rigidity, heat resistance, extrusion moldability, productivity, and a balance of these properties, and satisfies the halogen-free standard with a bromine content of approximately 900 ppm or less according to the IEC 61249-2-21 standard.

The background technology of the present invention is disclosed in Korean Patent No. 10-1425285, etc.

The purpose of the present invention is to provide a polypropylene resin composition having excellent flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, etc.

Another object of the present invention is to provide a molded product formed from the polypropylene resin composition.

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

1. One aspect of the present invention relates to a polypropylene resin composition. The polypropylene resin composition comprises: about 100 parts by weight of a polypropylene resin; about 0.3 to about 5 parts by weight of an aromatic phosphate compound; about 1 to about 10 parts by weight of a phosphorus-based compound; about 0.01 to about 0.15 parts by weight of a bromine-based compound; and about 0.2 to about 1 part by weight of 1,1-(1,1,2,2-tetramethylethylene)dibenzene.

2. In the above 1 specific example, the polypropylene resin may include at least one of a homo polypropylene resin, a block polypropylene resin, and a random polypropylene resin.

3. In the above 1 or 2 specific examples, the polypropylene resin may have a melt-flow index of about 0.05 to about 10 g/10 min, measured under conditions of 230° C. and 2.16 kg load according to ASTM D1238.

4. In the above specific examples 1 to 3, the aromatic phosphate compound may include a compound represented by the following chemical formula 1:

[Chemical Formula 1]

In the above chemical formula 1, R ₁ , R ₂ , R ₄ and R ₅ are each independently a hydrogen atom, a C6-C20 (carbon atoms 6 to 20) aryl group, or a C6-C20 aryl group substituted with a C1-C10 alkyl group, 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 from 0 to 10.

5. In the above 1 to 4 specific examples, the phosphorus nitrogen compound may include at least one 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.

6. In the above 1 to 5 specific examples, the brominated compound may include one or more of tetrabromobisphenol A bis(2,3-dibromopropyl ether), tetrabromobisphenol A, decabromodiphenyloxide, decabrominated diphenyl ethane, 1,2-bis(2,4,6-tribromophenyl)ethane, octabrom-1,3,3-trimethyl-1-phenylindane, and 2,4,6-tris(2,4,6-tribromophenoxy)-1,3,5-triazine.

7. In the above specific examples 1 to 6, the weight ratio of the sum of the aromatic phosphate compound and the phosphorus nitrogen compound to the bromine compound may be about 1:0.01 to about 1:0.05.

8. In the above specific examples 1 to 7, the weight ratio of the sum of the aromatic phosphate compound and the phosphorus nitrogen compound to the 1,1-(1,1,2,2-tetramethylethylene)dibenzene may be about 1:0.05 to about 1:0.4.

9. In the above 1 to 8 specific examples, the polypropylene resin composition may have a flame retardancy of V-2 or higher in a 0.8 mm thick injection molded specimen measured by the UL-94 vertical test method.

10. In the above 1 to 9 specific examples, the polypropylene resin composition may have a total combustion time of a 0.8 mm thick injection molded specimen of about 100 seconds or less as measured by the UL-94 vertical test method.

11. In the above 1 to 10 specific examples, the polypropylene resin composition may have a notched Izod impact strength of about 10 to about 50 kJ/m ² of a 6.4 mm thick specimen measured according to ASTM D256.

12. In the above specific examples 1 to 11, the polypropylene resin composition may have a tensile strength of about 20 to about 40 MPa of a 3.2 mm thick specimen measured under a condition of 50 mm/min according to ASTM D638, a flexural strength of about 20 to about 50 MPa of a 6.4 mm thick specimen measured under a condition of 2.8 mm/min according to ASTM D790, and a flexural modulus of about 1,000 to about 2,000 MPa of a 6.4 mm thick specimen measured under a condition of 2.8 mm/min according to ASTM D790.

13. In the above specific examples 1 to 12, the polypropylene resin composition may have a heat distortion temperature (HDT) of about 90 to about 140°C of a 6.4 mm thick specimen measured under conditions of 0.45 MPa and a heating rate of 120°C/hr according to ASTM D648.

14. In the above specific examples 1 to 13, the polypropylene resin composition may have a bromine content of about 900 ppm or less per 15 mg of a sample measured by ion chromatography according to KS C IEC 62321-3-2.

15. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from a polypropylene resin composition according to any one of 1 to 14.

The present invention has the effect of providing a polypropylene resin composition having excellent flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, etc., and a molded article formed therefrom by using recycled polypropylene resin.

Hereinafter, the present invention will be described in detail as follows.

A polypropylene resin composition according to the present invention comprises (A) a polypropylene resin; (B) an aromatic phosphate compound; (C) a phosphorus-nitrogen-containing compound; (D) a bromine-containing compound; and (E) 1,1-(1,1,2,2-tetramethylethylene)dibenzene.

In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

(A) Polypropylene resin

According to one specific example of the present invention, a polypropylene resin can be applied together with an aromatic phosphate compound, a phosphorus nitrogen compound, a bromine compound, and 1,1-(1,1,2,2-tetramethylethylene)dibenzene, thereby improving the flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, and the balance of these physical properties of a polypropylene resin composition. A polypropylene resin applied to a typical thermoplastic resin composition can be used.

In a specific example, the polypropylene resin may include at least one of a homo polypropylene resin, a block polypropylene resin, and a random polypropylene resin. Here, the block polypropylene resin may be a block polypropylene resin composed of a homo polypropylene block and an ethylene-propylene copolymer block and/or a homo polyethylene block, and the random polypropylene resin may be a propylene-ethylene random copolymer. For example, the polypropylene resin may be a homo polypropylene resin, a block polypropylene resin, a combination thereof, etc.

In a specific example, the polypropylene resin may have a melt flow index (MI) of about 0.05 to about 10 g/10 min, for example, about 0.1 to about 5 g/10 min, measured under conditions of 230° C. and 2.16 kg load according to ASTM D1238. In this range, the extrusion moldability, mechanical properties, flame retardancy, etc. of the polypropylene resin composition may be excellent.

(B) Aromatic phosphate compound

According to one specific example of the present invention, an aromatic phosphate compound can be applied to a polypropylene resin together with a phosphorus nitrogen compound, a bromine compound, and 1,1-(1,1,2,2-tetramethylethylene)dibenzene, thereby improving the flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, and the balance of these physical properties of the polypropylene resin composition. An aromatic phosphate compound used in a typical thermoplastic resin composition can be used.

In a specific example, the aromatic phosphate compound may include a compound represented by the following chemical formula 1.

[Chemical Formula 1]

In the above chemical formula 1, R ₁ , R ₂ , R ₄ and R ₅ are each independently a hydrogen atom, a C6-C20 (carbon atoms 6 to 20) aryl group, or a C6-C20 aryl group substituted with a C1-C10 alkyl group, R ₃ is a C6-C20 arylene group or a C6-C20 arylene group substituted with a C1-C10 alkyl group, for example, derived from a dialcohol such as resorcinol, hydroquinone, bisphenol-A, or bisphenol-S, and n is an integer of 0 to 10, for example, 0 to 4.

As the aromatic phosphate compound represented by the above chemical formula 1, when n is 0, examples thereof include diaryl phosphates such as diphenyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, tri(2,6-dimethylphenyl) phosphate, tri(2,4,6-trimethylphenyl) phosphate, tri(2,4-ditertiarybutylphenyl) phosphate, tri(2,6-dimethylphenyl) phosphate, etc., and when n is 1, examples thereof include tetrakis(2,6-dimethylphenyl) 1,3-phenylene bisphosphate, bisphenol-A bis(diphenylphosphate), resorcinol bis(diphenylphosphate), resorcinol bis[bis(2,6-dimethylphenyl) phosphate], resorcinol bis[bis(2,4-ditertiarybutylphenyl) phosphate], and hydroquinone. Examples thereof include bis[bis(2,6-dimethylphenyl)phosphate], hydroquinone bis(diphenylphosphate), hydroquinone bis[bis(2,4-ditertiarybutylphenyl)phosphate], and oligomeric phosphoric acid ester compounds having n of 2 or more, but are not limited thereto. These may be applied singly or in the form of a mixture of two or more. Preferably, resorcinol bis[bis(2,6-dimethylphenyl)phosphate], resorcinol bis(diphenylphosphate), a combination thereof, and the like can be used.

In a specific example, the aromatic phosphate compound may be included in an amount of about 0.3 to about 5 parts by weight, for example, about 0.4 to about 4 parts by weight, relative to about 100 parts by weight of the polypropylene resin. When the content of the aromatic phosphate compound is less than about 0.3 parts by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the flame retardancy, etc. of the polypropylene resin composition may be reduced, and when it exceeds about 5 parts by weight, there is a concern that the extrusion moldability, productivity, etc. of the polypropylene resin composition may be reduced.

(C) Nitrogen compounds

According to one specific example of the present invention, a phosphorus-nitrogen-based compound can be applied to a polypropylene resin together with an aromatic phosphate compound, a bromine-based compound, and 1,1-(1,1,2,2-tetramethylethylene)dibenzene, thereby improving the flame retardancy, impact resistance, rigidity, heat resistance, eco-friendliness, extrusion moldability, productivity, and the balance of these physical properties of the polypropylene resin composition. A phosphorus-nitrogen-based flame retardant used in a typical thermoplastic resin composition can be used.

In specific examples, the phosphorus nitrogen compound 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, multiple salts thereof, and the like. For example, the phosphorus nitrogen compound may include melamine polyphosphate, piperazine pyrophosphate, combinations thereof, and the like.

In a specific example, the phosphorus nitrogen compound may be included in an amount of about 1 to about 10 parts by weight, for example, about 1 to about 6.5 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the phosphorus nitrogen compound is less than about 1 part by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the flame retardancy, etc. of the polypropylene resin composition may be reduced, and if it exceeds about 10 parts by weight, there is a concern that the impact resistance, rigidity, etc. of the polypropylene resin composition may be reduced.

In a specific example, the weight ratio of the aromatic phosphate compound and the phosphorus nitrogen compound may be from about 1:0.1 to about 1:10, for example from about 1:0.3 to about 1:7. In this range, the flame retardancy, impact resistance, etc. of the polypropylene resin composition may be more excellent.

(D) Bromine compounds

According to one specific example of the present invention, a brominated compound can be applied to a polypropylene resin together with an aromatic phosphate compound, a phosphorus nitrogen compound, and 1,1-(1,1,2,2-tetramethylethylene)dibenzene, thereby improving the flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, and the balance of these physical properties of the polypropylene resin composition. Brominated flame retardants used in conventional thermoplastic resin compositions can be used.

In specific examples, the brominated compound may include tetrabromobisphenol A bis(2,3-dibromopropyl ether), tetrabromobisphenol A, decabromodiphenyloxide, decabrominateddiphenyl ethane, 1,2-bis(2,4,6-tribromophenyl)ethane, octabromomo-1,3,3-trimethyl-1-phenylindane, 2,4,6-tris(2,4,6-tribromophenoxy)-1,3,5-triazine, combinations thereof, and the like. For example, the brominated compound may include tetrabromobisphenol A bis(2,3-dibromopropyl ether), tetrabromobisphenol A, combinations thereof, and the like.

In a specific example, the brominated compound may be included in an amount of about 0.01 to about 0.15 parts by weight, for example, about 0.05 to about 0.12 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the brominated compound is less than about 0.01 parts by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the flame retardancy, etc. of the polypropylene resin composition may be reduced, and if it exceeds about 0.15 parts by weight, there is a concern that the environmental friendliness, etc. of the polypropylene resin composition may be reduced.

In a specific example, the weight ratio of the sum of the aromatic phosphate compound and the phosphorus nitrogen-based compound to the bromine-based compound (aromatic phosphate compound + phosphorus nitrogen-based compound: bromine-based compound) may be from about 1:0.01 to about 1:0.05, for example, from about 1:0.013 to about 1:0.048. In this range, the flame retardancy, impact resistance, environmental friendliness, etc. of the polypropylene resin composition may be more excellent.

(E) 1,1-(1,1,2,2-tetramethylethylene)dibenzene

According to one specific example of the present invention, 1,1-(1,1,2,2-tetramethylethylene)dibenzene can be applied to a polypropylene resin together with an aromatic phosphate compound, a phosphorus nitrogen-based compound, a bromine-based compound, etc., to improve the flame retardancy, impact resistance, rigidity, heat resistance, eco-friendliness, extrusion moldability, productivity, and the balance of these physical properties, etc. of the polypropylene resin composition.

In a specific example, the 1,1-(1,1,2,2-tetramethylethylene)dibenzene may be included in an amount of about 0.2 to about 1 part by weight, for example, about 0.3 to about 0.8 part by weight, relative to about 100 parts by weight of the polypropylene resin. When the content of the 1,1-(1,1,2,2-tetramethylethylene)dibenzene is less than about 0.2 part by weight relative to about 100 parts by weight of the polypropylene resin, there is a concern that the flame retardancy, etc. of the polypropylene resin composition may be reduced, and when it exceeds about 1 part by weight, there is a concern that the impact resistance, rigidity, extrusion moldability, productivity, etc. of the polypropylene resin composition may be reduced.

In a specific example, the weight ratio of the sum of the aromatic phosphate compound and the phosphorus nitrogen-based compound to the 1,1-(1,1,2,2-tetramethylethylene)dibenzene (aromatic phosphate compound + phosphorus nitrogen-based compound: 1,1-(1,1,2,2-tetramethylethylene)dibenzene) may be about 1:0.05 to about 1:0.4, for example, about 1:0.06 to about 1:0.35. In this range, the extrusion moldability, flame retardancy, impact resistance, etc. of the polypropylene resin composition may be more excellent.

The polypropylene resin composition according to one specific example of the present invention may further include additives included in conventional thermoplastic resin compositions. Examples of the additives include, but are not limited to, UV stabilizers, antioxidants, release agents, nucleating agents, pigments, dyes, and mixtures thereof.

In a specific example, when the additive is used, the content may be about 0.001 to about 40 parts by weight, for example, about 0.01 to about 10 parts by weight, with respect to about 100 parts by weight of the polypropylene resin, but is not limited thereto.

A polypropylene resin composition according to one specific example of the present invention may be in the form of pellets obtained by mixing the above components and melt-extruding them at about 170 to about 230°C, for example, about 180 to about 220°C, using a conventional twin-screw extruder.

In a specific example, the polypropylene resin composition may have a flame retardancy of V-2 or higher in a 0.8 mm thick injection molded specimen measured by the UL-94 vertical test method.

In specific embodiments, the polypropylene resin composition may have a total burning time of about 100 seconds or less, for example, about 10 to about 90 seconds, of a 0.8 mm thick injection molded specimen as measured by the UL-94 vertical test method.

In specific examples, the polypropylene resin composition may have a notched Izod impact strength of about 10 to about 50 kJ/m ² , for example, about 10 to about 35 kJ/m ² , of a 6.4 mm thick specimen as measured according to ASTM D256.

In a specific example, the polypropylene resin composition may have a tensile strength of about 20 to about 40 MPa, for example, about 25 to about 35 MPa, of a 3.2 mm thick specimen measured under conditions of 50 mm/min according to ASTM D638.

In a specific example, the polypropylene resin composition may have a flexural strength of about 20 to about 50 MPa, for example, about 25 to about 35 MPa, of a 6.4 mm thick specimen measured under a condition of 2.8 mm/min according to ASTM D790.

In a specific example, the polypropylene resin composition may have a flexural modulus of about 1,000 to about 2,000 MPa, for example, about 1,010 to about 1,500 MPa, of a 6.4 mm thick specimen measured under a condition of 2.8 mm/min according to ASTM D790.

In a specific example, the polypropylene resin composition may have a heat distortion temperature (HDT) of about 90 to about 140°C, for example, about 100 to about 120°C, of a 6.4 mm thick specimen measured under conditions of 0.45 MPa and a heating rate of 120°C/hr according to ASTM D648.

In a specific example, the polypropylene resin composition may have a bromine content of about 900 ppm or less, for example, about 600 to about 900 ppm, per 15 mg of a specimen measured by ion chromatography according to KS C IEC 62321-3-2.

In a specific example, the polypropylene resin composition may have a melt-flow index of about 1 to about 5 g/10 min, for example, about 1.5 to about 4.5 g/10 min, measured under conditions of 230° C. and 2.16 kg load according to ASTM D1238.

The molded article according to the present invention is formed from the polypropylene resin composition. The polypropylene resin composition can be manufactured in the form of pellets, and the manufactured 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 skilled in the art to which the present invention belongs.

In a specific example, the molded product has excellent flame retardancy, impact resistance, rigidity, heat resistance, environmental friendliness, extrusion moldability, productivity, and balance of these properties, and is therefore useful as an architectural interior material.

Hereinafter, the present invention will be described more specifically through examples; however, these examples are for the purpose of explanation only and should not be construed as limiting the present invention.

Example

Below, the specifications of each component used in the examples and comparative examples are as follows.

(A) Polypropylene resin

55.6 wt% of block polypropylene resin (ethylene-propylene block copolymer, B-PP, manufacturer: Lotte Chemical, product name: B-310) and 44.4 wt% of homo polypropylene resin (manufacturer: Lotte Chemical, product name: B-120) were mixed and used.

(B) Aromatic phosphate compound

Tetrakis(2,6-dimethylphenyl)1,3-phenylene bisphosphate (Manufacturer: DAIHACHI, Product name: PX-200) was used.

(C) Nitrogen compounds

Melamine polyphosphate (Manufacturer: Kempia, Product name: MPP-D) was used.

(D) Bromine compounds

Tetrabromobisphenol A bis(2,3-dibromopropyl ether) (BDDP, manufacturer: OCEAN CHEMICAL, product name: XZ-6800) was used.

(E) 1,1-(1,1,2,2-tetramethylethylene)dibenzene

1,1-(1,1,2,2-tetramethylethylene)dibenzene (Manufacturer: WUXI ZHUFENG FINE CHEMICAL, Product name: Dicumene) was used.

Examples 1 to 9 and Comparative Examples 1 to 8

The above-described components were added in the contents as shown in Tables 1, 2, 3, and 4 below, and then extruded at about 180 to about 220°C to manufacture pellets. The extrusion was performed using a twin-screw extruder with L/D=36 and a diameter of 45 mm, and the manufactured pellets were dried at about 80°C for about 2 hours or more and then injected using a 220-ton injection molding machine (molding temperature: about 220°C, mold temperature: about 40°C) to manufacture test pieces. The physical properties of the manufactured test pieces were evaluated by the following methods, and the results are shown in Tables 1, 2, 3, and 4 below.

Method of measuring physical properties

(1) Flame retardancy evaluation: The flame retardancy of a 0.8 mm thick injection specimen was measured using the UL-94 vertical test method. (N.C.: Non-Class, not meeting the standard)

(2) Flame retardancy evaluation: The total burning time (sum of the burning time after the first contact (T1) and the burning time after the second contact (T2), unit: seconds) of a 0.8 mm thick injection molded specimen was measured using the UL-94 vertical test method.

(3) Notched Izod impact strength (unit: kJ/ ^m2 ): The notched Izod impact strength of a 6.4 mm thick specimen was measured according to ASTM D256.

(4) Tensile strength (unit: MPa): The tensile strength of a 3.2 mm thick specimen was measured under the condition of 50 mm/min according to ASTM D638.

(5) Flexural strength (unit: MPa): The flexural strength of a 6.4 mm thick specimen was measured under the condition of 2.8 mm/min according to ASTM D790.

(6) Flexural modulus (unit: MPa): The flexural modulus of a 6.4 mm thick specimen was measured under conditions of 2.8 mm/min according to ASTM D790.

(7) Heat distortion temperature (unit: ℃): According to ASTM D648, the heat distortion temperature (HDT) of a 6.4 mm thick specimen was measured under the conditions of 0.45 MPa and a heating rate of 120 ℃/hr.

(8) Bromine content (unit: ppm): The bromine content in 15 mg of the sample was measured by ion chromatography according to KS C IEC 62321-3-2.

(9) Melt-flow index (unit: g/10 min): Melt-flow index was measured under the conditions of 230℃ and 2.16 kg load according to ASTM D1238.

(10) Productivity evaluation: When adding components for pellet manufacturing, the presence or absence of hopper clogging was checked.

Example 1 2 3 4 5 (A) (weight) 100 100 100 100 100 (B) (Weight) 0.4 1 4 1 1 (C) (weight) 1.6 1.6 1.6 1 6.5 (D) (weight) 0.1 0.1 0.1 0.1 0.1 (E) (weight) 0.52 0.52 0.52 0.52 0.52 Flame retardancy V-2 V-2 V-2 V-2 V-2 Total combustion time 77 39 16 44 28 Notched Izod Impact Strength 29.6 27.4 26.1 28.6 10.3 tensile strength 31.1 31.2 31.4 31.8 30.1 Flexural strength 30.1 30.5 30.4 31.6 27.6 Flexural modulus 1,140 1,110 1,080 1,110 1,010 Heat deflection temperature 115.9 115.6 114.8 116.9 108.8 Bromine content 684 736 715 720 698 Flow Index 2.2 2.0 2.4 2.8 3.5 Hopper clogged or not radish radish radish radish radish

Example 6 7 8 9 (A) (weight) 100 100 100 100 (B) (Weight) 1 1 1 1 (C) (weight) 1.6 1.6 1.6 1.6 (D) (weight) 0.05 0.12 0.1 0.1 (E) (weight) 0.52 0.52 0.3 0.8 Flame retardancy V-2 V-2 V-2 V-2 Total combustion time 89 36 62 19 Notched Izod Impact Strength 26.8 28.1 29.5 23.8 tensile strength 31.3 32 31.5 31 Flexural strength 30.2 30.6 31.2 30.1 Flexural modulus 1,110 1,100 1,130 1,100 Heat deflection temperature 115.3 116.4 116.3 114.2 Bromine content 376 880 751 699 Flow Index 2.1 2.1 1.9 4.2 Hopper clogged or not radish radish radish radish

Comparative example 1 2 3 4 (A) (weight) 100 100 100 100 (B) (Weight) 0.1 6 1 1 (C) (weight) 1.6 1.6 0.5 14 (D) (weight) 0.1 0.1 0.1 0.1 (E) (weight) 0.52 0.52 0.52 0.52 Flame retardancy N.C. Not available for production V-2 V-2 Total combustion time 250↑ 108 33 Notched Izod Impact Strength 29.4 29.9 6.3 tensile strength 31.4 32.1 28.6 Flexural strength 30.7 31.8 25.5 Flexural modulus 1,140 1,130 950 Heat deflection temperature 115.5 117.2 107.1 Bromine content 721 681 744 Flow Index 2.2 1.8 4.8 Hopper clogged or not radish you radish radish

Comparative example 5 6 7 8 (A) (weight) 100 100 100 100 (B) (Weight) 1 1 1 1 (C) (weight) 1.6 1.6 1.6 1.6 (D) (weight) - 0.2 0.16 0.16 (E) (weight) 0.52 0.52 0.1 1.5 Flame retardancy V-2 V-2 N.C. V-2 Total combustion time 149 14 250↑ 11 Notched Izod Impact Strength 26.8 28.8 29.2 9.6 tensile strength 30.8 31.9 32.9 30.1 Flexural strength 29.6 30.9 31 29.2 Flexural modulus 1,130 1,080 1,140 970 Heat deflection temperature 117 115.9 116.6 112.5 Bromine content N.D. 1,399 663 771 Flow Index 1.9 2.3 1.8 6.4 Hopper clogged or not radish radish radish radish

From the above results, it can be seen that the polypropylene resin composition of the present invention is excellent in flame retardancy (flame retardancy, total combustion time), impact resistance (notched Izod impact strength), rigidity (tensile strength, flexural strength, flexural modulus), heat resistance (heat distortion temperature), extrusion moldability (flow index), productivity (hopper clogging), and the balance of these physical properties, and it can be seen that it is environmentally friendly with a halogen (bromine) content of less than 900 ppm (satisfies the halogen-free standard).

On the other hand, in the case of Comparative Example 1 where the content of the aromatic phosphate compound is below the range of the present invention, it can be seen that the flame retardancy, etc. are reduced, and in the case of Comparative Example 2 where the content of the aromatic phosphate compound exceeds the range of the present invention, it can be seen that the hopper input clogging phenomenon occurred and production was impossible, and in the case of Comparative Example 3 where the content of the phosphorus nitrogen-based compound is below the range of the present invention, it can be seen that the flame retardancy, etc. are reduced, and in the case of Comparative Example 4 where the content of the phosphorus nitrogen-based compound exceeds the range of the present invention, it can be seen that the impact resistance, rigidity, etc. are reduced. In addition, in the case of Comparative Example 5 where the content of the brominated compound is below the range of the present invention, it can be seen that the flame retardancy, etc. are reduced, and in the case of Comparative Example 6 where the content of the brominated compound exceeds the range of the present invention, it can be seen that the halogen (bromine) content exceeds 900 ppm, thereby reducing the environmental friendliness, etc. In the case of Comparative Example 7 where the content of 1,1-(1,1,2,2-tetramethylethylene)dibenzene is below the range of the present invention, it can be seen that the flame retardancy, etc. are reduced, and in the case of Comparative Example 8 where the content of 1,1-(1,1,2,2-tetramethylethylene)dibenzene exceeds the range of the present invention, it can be seen that the impact resistance, rigidity, extrusion moldability, etc. are reduced.

The present invention has been described with reference to embodiments. Those skilled in the art will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated by the claims, not the above description, and all differences within the scope equivalent thereto should be interpreted as being included in the present invention.

Claims (15)

About 100 parts by weight of polypropylene resin; About 0.3 to about 5 parts by weight of an aromatic phosphate compound; About 1 to about 10 parts by weight of a nitrogen compound; About 0.01 to about 0.15 parts by weight of a brominated compound; and A polypropylene resin composition comprising about 0.2 to about 1 part by weight of 1,1-(1,1,2,2-tetramethylethylene)dibenzene. A polypropylene resin composition, characterized in that in claim 1, the polypropylene resin comprises at least one of homo polypropylene resin, block polypropylene resin, and random polypropylene resin. In the first paragraph, the polypropylene resin composition is characterized in that the polypropylene resin has a melt-flow index of about 0.05 to about 10 g/10 min as measured under conditions of 230°C and 2.16 kg load according to ASTM D1238. In claim 1, a polypropylene resin composition characterized in that the aromatic phosphate compound comprises a compound represented by the following chemical formula 1: [Chemical Formula 1]

In the above chemical formula 1, R ₁ , R ₂ , R ₄ and R ₅ are each independently a hydrogen atom, a C6-C20 (carbon atoms 6 to 20) aryl group, or a C6-C20 aryl group substituted with a C1-C10 alkyl group, 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 from 0 to 10. A polypropylene resin composition according to claim 1, wherein the phosphorus-based compound comprises at least one 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. A polypropylene resin composition in claim 1, characterized in that the brominated compound comprises at least one selected from the group consisting of tetrabromobisphenol A bis(2,3-dibromopropyl ether), tetrabromobisphenol A, decabromodiphenyloxide, decabrominated diphenyl ethane, 1,2-bis(2,4,6-tribromophenyl)ethane, octabrom-1,3,3-trimethyl-1-phenylindane, and 2,4,6-tris(2,4,6-tribromophenoxy)-1,3,5-triazine. A polypropylene resin composition, characterized in that in claim 1, a weight ratio of the sum of the aromatic phosphate compound and the phosphorus nitrogen compound to the bromine compound is about 1:0.01 to about 1:0.05. A polypropylene resin composition, characterized in that in claim 1, a weight ratio of the sum of the aromatic phosphate compound and the phosphorus nitrogen compound to the 1,1-(1,1,2,2-tetramethylethylene)dibenzene is about 1:0.05 to about 1:0.4. In claim 1, the polypropylene resin composition is characterized in that the flame retardancy of a 0.8 mm thick injection molded specimen measured by the UL-94 vertical test method is V-2 or higher. In claim 1, the polypropylene resin composition is characterized in that the total combustion time of a 0.8 mm thick injection molded specimen measured by the UL-94 vertical test method is about 100 seconds or less. In claim 1, the polypropylene resin composition is characterized in that the notched Izod impact strength of a 6.4 mm thick specimen measured according to ASTM D256 is about 10 to about 50 kJ/m ² . In claim 1, the polypropylene resin composition is characterized in that the tensile strength of a 3.2 mm thick specimen measured under a condition of 50 mm/min according to ASTM D638 is about 20 to about 40 MPa, the flexural strength of a 6.4 mm thick specimen measured under a condition of 2.8 mm/min according to ASTM D790 is about 20 to about 50 MPa, and the flexural modulus of a 6.4 mm thick specimen measured under a condition of 2.8 mm/min according to ASTM D790 is about 1,000 to about 2,000 MPa. In the first paragraph, the polypropylene resin composition is characterized in that the heat distortion temperature (HDT) of a 6.4 mm thick specimen measured under the conditions of 0.45 MPa and a heating rate of 120°C/hr according to ASTM D648 is about 90 to about 140°C. In claim 1, the polypropylene resin composition is characterized in that the bromine content in 15 mg of a specimen measured by ion chromatography is about 900 ppm or less according to KS C IEC 62321-3-2. A molded product characterized by being formed from a polypropylene resin composition according to any one of claims 1 to 14.