Thermoplastic resin composition, method for preparing the same and article prepared therefrom

Abstract

The present invention relates to a thermoplastic resin composition, a method for manufacturing the same, and a molded article comprising the same, and more specifically, to a thermoplastic resin composition characterized by comprising (A) 58 to 67 weight% of polypropylene having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min; (B) 9 to 18 weight% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min; and (C) 18 to 30 weight% of talc having an average particle size of 2 to 7 μm; a method for manufacturing the same, and a molded article comprising the same. According to the present invention, both fluidity and impact resistance are excellent, and the occurrence of flow marks in large injection-molded products is suppressed, thereby providing the effect of providing unpainted injection-molded products.

Description

Technology Field

[0001] The present invention relates to a thermoplastic resin composition, a method for manufacturing the same, and a molded article comprising the same. More specifically, the invention relates to a thermoplastic resin composition that exhibits excellent impact resistance and fluidity and does not generate flow marks, thereby enabling high-quality application to large injection-molded products using the mold-in-colored (MIC) method, a method for manufacturing the same, and a molded article comprising the same. Background Technology

[0003] Polypropylene resin is widely used as a material for electrical and electronic products, automotive interior and exterior materials, and office equipment due to reasons such as lightweighting caused by its low specific gravity and ease of recycling. In particular, polypropylene resin compositions are used as materials for exterior parts of automobiles, such as bumpers, side sill moldings, and garnishes.

[0004] Meanwhile, polypropylene resin has high fluidity but low impact resistance, making it difficult to apply to large injection-molded parts, particularly exterior parts for large vehicles. To address this, since impact resistance and fluidity are inversely proportional, a polypropylene resin with low fluidity was applied to improve impact resistance; however, this resulted in flow marks on the surface, degrading the appearance quality. To solve these problems, a painting process is implemented, but this process causes various environmental issues due to the excessive use of solvents. Furthermore, the multi-stage nature of the process increases costs, and poor compatibility between the paint and the resin can lead to defects in the parts.

[0005] Accordingly, there is a need to develop a thermoplastic resin composition that offers excellent impact resistance while suppressing the occurrence of flow marks, enabling its application to large injection-molded products, particularly exterior parts for large vehicles, using a paintless process that eliminates the need for a painting step. Prior art literature

[0007] Korean Patent Publication No. 2000-0045582 The problem to be solved

[0008] In order to solve the problems of the prior art described above, the present invention aims to provide a thermoplastic resin composition that exhibits excellent impact resistance and fluidity, suppresses the occurrence of flow marks, and enables high-quality application to exterior parts of large vehicles without painting.

[0009] In addition, the present invention aims to provide a method for manufacturing the above-mentioned thermoplastic resin composition.

[0010] In addition, the present invention aims to provide a molded article manufactured from the above-described thermoplastic resin composition.

[0012] The above purposes and other purposes of this description can all be achieved by the description below. means of solving the problem

[0014] To achieve the above objective, the present invention provides a thermoplastic resin composition characterized by comprising: (A) 54 to 62 weight% of polypropylene having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min; (B) 14 to 22 weight% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min; and (C) 20 to 28 weight% of talc having an average particle size of 2 to 7 μm.

[0016] In addition, the present invention comprises (A) 54 to 62 wt% of polypropylene having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min; (B) 14 to 22 wt% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min; and (C) 20 to 28 wt% of talc having an average particle size of 2 to 7 μm; wherein the melt index measured at 2.16 kg after holding at 230°C for 6 minutes in accordance with ISO 1133-1 is 60 to 70 g / 10 min, and the Izod impact strength measured with a notched specimen with a thickness of 4 mm in accordance with ISO 180 is 7.5 KJ / m² 2 A thermoplastic resin composition characterized by the above can be provided.

[0018] In addition, the present invention provides a method for preparing a thermoplastic resin composition, characterized by comprising the step of preparing a thermoplastic resin composition by kneading and extruding under conditions of 200 to 300°C and 100 to 300 rpm, including (A) 54 to 62 weight% of a polypropylene resin having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min, (B) 14 to 22 weight% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min, and (C) 20 to 28 weight% of talc having an average particle size of 2 to 7 μm.

[0020] In addition, the present invention comprises the step of preparing a thermoplastic resin composition by kneading and extruding under conditions of 200 to 300°C and 100 to 300 rpm, comprising (A) 54 to 62 weight% of a polypropylene resin having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min, (B) 14 to 22 weight% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min, and (C) 20 to 28 weight% of talc having an average particle size of 2 to 7 μm, wherein the prepared thermoplastic resin composition has a melt index of 60 to 70 g / 10 min measured at 2.16 kg after holding at 230°C for 6 minutes in accordance with ISO 1133-1, and a thickness of 4 mm in accordance with ISO 180. Izod impact strength measured with a notched specimen is 7.5 KJ / m 2 A method for manufacturing a thermoplastic resin composition characterized by the above can be provided.

[0022] In addition, the present invention provides a molded article characterized by comprising the above-mentioned thermoplastic resin composition. Effects of the invention

[0024] According to the present invention, there is an effect of providing a thermoplastic resin composition, a method for manufacturing the same, and a molded article comprising the same, which has excellent impact resistance and fluidity and suppresses the occurrence of flow marks, allowing for high-quality application to exterior parts of large vehicles or campervans without a painting process, and offers economic and environmental advantages as the painting process is not performed. In particular, the thermoplastic resin composition according to the present invention has the advantage of being applicable to high-quality exterior parts of large vehicles such as campervans and trucks. Brief explanation of the drawing

[0026] Figure 1 is a photograph showing the occurrence of flow marks on the surface of a wide spiral specimen after injection molding, where the left side is the specimen according to Comparative Example 1 and the right side is the specimen according to Example 1. Specific details for implementing the invention

[0027] The thermoplastic resin composition, the method for manufacturing the same, and a molded article containing the same described herein will be described in detail below.

[0028] The inventors confirmed that when the melt index of each polypropylene and polyolefin-based polymer is adjusted to within a predetermined range and fine talc is included within a predetermined range, both fluidity and impact resistance are excellent, and the occurrence of flow marks in large injection-molded products is suppressed, thereby eliminating the need for a coating process. Based on this, they further devoted themselves to research and completed the present invention.

[0029] The thermoplastic resin composition according to the present description is described in detail as follows.

[0031] The thermoplastic resin composition of the present invention is characterized by comprising (A) 54 to 62 weight% of polypropylene with a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min; (B) 14 to 22 weight% of a polyolefin-based polymer with a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min; and (C) 20 to 28 weight% of talc with an average particle size of 2 to 7 μm; and in this case, both impact resistance and fluidity are excellent, and the occurrence of flow marks is suppressed, so there is an advantage that it can be applied to exterior parts of large vehicles with high quality without painting.

[0033] The thermoplastic resin composition of the present invention will be described in detail below according to its components.

[0035] (A) Polypropylene with a melt index (230℃, 2.16 kg) of 60 to 140 g / 10 min

[0036] The above (A) polypropylene may preferably have a melt index (230°C, 2.16 kg) of 70 to 130 g / 10 min, more preferably 80 to 120 g / 10 min, and even more preferably 90 to 110 g / 10 min, and within this range, it has excellent fluidity, which has the advantage of being able to mold large injection-molded products.

[0038] The above (A) polypropylene may be, for example, 54 to 62 weight%, preferably 56 to 60 weight%, more preferably 58 to 60 weight% with respect to 100 weight% of the total composition of (A) to (C), and within this range, there is an effect of excellent fluidity and suppression of flow mark occurrence.

[0039] The above (A) polypropylene may be, for example, an impact polypropylene having an impact strength of 5 kgf·cm / cm or more, preferably 6 kgf·cm / cm or more, measured at room temperature (20~25℃) according to ASTM D256, and in this case, both fluidity and impact strength are excellent and the occurrence of flow marks is suppressed.

[0040] The above (A) polypropylene may be, for example, an impact polypropylene having a low-temperature impact strength of 2 kgf·cm / cm or more, preferably 3 kgf·cm / cm or more, measured at a low temperature (-18 to 23℃) according to ASTM D256, and in this case, both fluidity and impact strength are excellent and the occurrence of flow marks is suppressed.

[0042] The above (A) polypropylene resin is, for example, 13 It may be a highly crystalline polypropylene having an isotactic pentad fraction of 96 wt% or more by C-NMR, preferably 98 wt% or more, and within this range, it has the effect of excellent impact strength, especially at low temperatures.

[0044] The above (A) polypropylene preferably has a melt index (230°C, 2.16 kg) of 70 to 130 g / 10 min and 13 Highly crystalline impact polypropylene having an isotactic pentad fraction of 96 wt% or more by C-NMR and an impact strength of 5 kgf·cm / cm or more measured at room temperature (20~25℃) according to ASTM D256, more preferably having a melt index (230℃, 2.16 kg) of 80 to 120 g / 10 min.13 It may be a highly crystalline impact polypropylene having an isotactic pentad fraction of 98 wt% or more by C-NMR and an impact strength of 6 kgf·cm / cm or more measured at room temperature (20~25℃) according to ASTM D256. In this case, it has excellent impact resistance and fluidity and does not produce flow marks, so it has the advantage of being applicable to large injection molded products using a paintless method.

[0046] The above (A) polypropylene may preferably have a heat distortion temperature of 130°C or higher, more preferably 133°C or higher as measured according to ASTM D648, and within this range, it has excellent impact resistance and the effect of suppressing the occurrence of flow marks.

[0048] The above (A) polypropylene may preferably have a Rockwell surface hardness of 100 or more, measured on an R-scale according to ASTM D785, more preferably 105 or more, and within this range, it has excellent impact resistance and the effect of suppressing the occurrence of flow marks.

[0050] In this description, polypropylene is not particularly limited as long as it follows the definition of the present invention, and commercially available products may be used.

[0052] (B) Polyolefin-based polymer with a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min

[0053] The above (B) polyolefin-based polymer may preferably have a melt index (230°C, 2.16 kg) of 25 to 45 g / 10 min, more preferably 30 to 40 g / 10 min, and within this range, fluidity, flexural modulus, and flow mark generation are suppressed, which has the advantage of excellent surface appearance.

[0055] The above (B) polyolefin-based polymer is, for example, a polyolefin-based elastomer, preferably a rubber polymerized from ethylene and an α-olefin having 3 to 12 carbon atoms, and more preferably a rubber polymerized from ethylene and an α-olefin having 4 to 8 carbon atoms, in which case there is an advantage of excellent flowability and flexural modulus and no flow marks are generated, so the surface appearance is excellent.

[0056] The above α-olefin may be one or more selected from the group consisting of, for example, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicocene, norbornene, norvonadiene, ethylidenenorbornene, phenylnorbornene, vinylnorbornene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene, and 3-chloromethylstyrene.

[0057] The above (B) polyolefin-based polymer is preferably one or more selected from the group consisting of ethylene-1-butene rubber, ethylene-butylene rubber, ethylene-1-pentene rubber, ethylene-1-hexene rubber, ethylene-1-heptene rubber, ethylene-1-octene rubber, and ethylene-4-methyl-1-pentene rubber, and more preferably may be ethylene-1-butene rubber (EBR), ethylene-1-octene rubber (EOR), or a mixture thereof, and within this range, there is an advantage of excellent flowability and flexural modulus and excellent surface appearance as no flow marks occur.

[0059] The above (B) polyolefin-based polymer may be, for example, 14 to 22 weight%, preferably 16 to 20 weight%, more preferably 16 to 18 weight% with respect to 100 weight% of the total composition of (A) to (C), and within this range, there is an effect of excellent fluidity and suppression of flow mark occurrence.

[0060] The above (B) polyolefin-based polymer may, for example, have a weight-average molecular weight (Mw) of 10,000 g / mol to 80,000 g / mol, preferably 20,000 g / mol to 70,000 g / mol, more preferably 30,000 g / mol to 65,000 g / mol, and within this range, have excellent mechanical properties.

[0062] The above (B) polyolefin-based polymer may, for example, have a polydispersity index (PDI) of 1.5 to 3, preferably 1.5 to 2.5, more preferably 1.9 to 2.15, and within this range, have excellent mechanical properties.

[0063] In this description, the polydispersity index can be calculated by dividing the weight-average molecular weight by the number-average molecular weight. A high polydispersity index means that the standard deviation of the molecular weight distribution is large, and the value may be closer to 1 as the molecular weight distribution becomes narrower.

[0064] Unless otherwise defined, the weight-average molecular weight and number-average molecular weight in this description can be measured using Gel Permeation Chromatography (GPC, waters breeze), and as a specific example, they can be measured as relative values ​​to a standard polystyrene (PS) sample via Gel Permeation Chromatography (GPC, waters breeze) using Tetrahydrofuran (THF) as the eluent. In this case, as a specific measurement example, the measurement can be performed under the following conditions: solvent: THF, column temperature: 40℃, flow rate: 0.3ml / min, sample concentration: 20mg / ml, injection volume: 5µl, column model: 1xPLgel 10㎛ MiniMix-B (250x4.6mm) + 1xPLgel 10㎛ MiniMix-B (250x4.6mm) + 1xPLgel 10㎛ MiniMix-B Guard (50x4.6mm), equipment name: Agilent 1200 series system, Refractive index detector: Agilent G1362 RID, RI temperature: 35℃, data processing: Agilent ChemStation S / W, test method (Mn, Mw and PDI): OECD TG 118.

[0066] The above (B) polyolefin-based polymer can exhibit a narrow molecular weight distribution within the above range by controlling the molecular weight distribution through the introduction of an optimal amount of hydrogen during the polymerization reaction for its production.

[0068] The above (B) olefin-based polymer may, for example, have α-olefin-derived repeating units measured by nuclear magnetic spectroscopy in an amount of 15 to 45 weight%, preferably 20 to 45 weight%, more preferably 20 to 40 weight%, relative to 100 weight% of the olefin-based polymer, and within this range, it has the effect of having excellent impact resistance and excellent balance of physical properties.

[0069] The above (B) olefin copolymer can be obtained by a manufacturing method comprising the step of polymerizing an olefin monomer by introducing hydrogen at a rate of 10 to 100 cc / min in the presence of a catalyst composition for olefin polymerization comprising, for example, a transition metal compound of Formula 1 below.

[0070] [Chemical Formula 1]

[0071]

[0072] In the above chemical formula 1,

[0073] R1 is hydrogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkenyl having 2 to 20 carbon atoms; an alkoxy having 1 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an arylalkoxy having 7 to 20 carbon atoms; an alkylaryl having 7 to 20 carbon atoms; or an arylalkyl having 7 to 20 carbon atoms, and

[0074] R 2a to R 2e Each is independently hydrogen; halogen; alkyl having 1 to 20 carbon atoms; cycloalkyl having 3 to 20 carbon atoms; alkenyl having 2 to 20 carbon atoms; alkoxy having 1 to 20 carbon atoms; or aryl having 6 to 20 carbon atoms, and

[0075] R3 is hydrogen; halogen; alkyl having 1 to 20 carbon atoms; cycloalkyl having 3 to 20 carbon atoms; alkenyl having 2 to 20 carbon atoms; aryl having 6 to 20 carbon atoms; alkylaryl having 6 to 20 carbon atoms; arylalkyl having 7 to 20 carbon atoms; alkylamido having 1 to 20 carbon atoms; arylamido having 6 to 20 carbon atoms; alkylidene having 1 to 20 carbon atoms; or phenyl substituted with one or more selected from the group consisting of halogen, alkyl having 1 to 20 carbon atoms, cycloalkyl having 3 to 20 carbon atoms, alkenyl having 2 to 20 carbon atoms, alkoxy having 1 to 20 carbon atoms, and aryl having 6 to 20 carbon atoms; and

[0076] R4 to R9 are each independently hydrogen; silyl; alkyl having 1 to 20 carbon atoms; cycloalkyl having 3 to 20 carbon atoms; alkenyl having 2 to 20 carbon atoms; aryl having 6 to 20 carbon atoms; alkylaryl having 7 to 20 carbon atoms; arylalkyl having 7 to 20 carbon atoms; or a metalloid radical of a Group 14 metal substituted with hydrocarbyl having 1 to 20 carbon atoms; and two or more adjacent to each other among R6 to R9 can be connected to each other to form a ring, and

[0077] Q is Si, C, N, P, or S, and

[0078] M is a group 4 transition metal, and

[0079] X1 and X2 are each independently hydrogen; halogen; alkyl having 1 to 20 carbon atoms; cycloalkyl having 3 to 20 carbon atoms; alkenyl having 2 to 20 carbon atoms; aryl having 6 to 20 carbon atoms; alkylaryl having 7 to 20 carbon atoms; arylalkyl having 7 to 20 carbon atoms; alkylamino having 1 to 20 carbon atoms; arylamino having 6 to 20 carbon atoms; or alkylidene having 1 to 20 carbon atoms.

[0081] Preferably, in the transition metal compound of Formula 1,

[0082] The above R1 may be hydrogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an alkoxy having 1 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an arylalkoxy having 7 to 20 carbon atoms; an alkylaryl having 7 to 20 carbon atoms; or an arylalkyl having 7 to 20 carbon atoms.

[0083] The above R 2a to R 2e Each can independently be hydrogen; a halogen; an alkyl having 1 to 12 carbon atoms; a cycloalkyl having 3 to 12 carbon atoms; an alkenyl having 2 to 12 carbon atoms; an alkoxy having 1 to 12 carbon atoms; or a phenyl, and

[0084] The above R3 may be hydrogen; a halogen; an alkyl having 1 to 12 carbon atoms; a cycloalkyl having 3 to 12 carbon atoms; an alkenyl having 2 to 12 carbon atoms; an aryl having 6 to 20 carbon atoms; an alkylaryl having 7 to 13 carbon atoms; an arylalkyl having 7 to 13 carbon atoms; or a phenyl substituted with one or more selected from the group consisting of a halogen, an alkyl having 1 to 12 carbon atoms, a cycloalkyl having 3 to 12 carbon atoms, an alkenyl having 2 to 12 carbon atoms, an alkoxy having 1 to 12 carbon atoms, and a phenyl.

[0085] The above R4 to R9 may each independently be hydrogen; an alkyl having 1 to 20 carbon atoms; a cycloalkyl having 3 to 20 carbon atoms; an aryl having 6 to 20 carbon atoms; an alkylaryl having 7 to 20 carbon atoms; or an arylalkyl having 7 to 20 carbon atoms.

[0086] Two or more adjacent R6 to R9 may be connected to each other to form an aliphatic ring having 5 to 20 carbon atoms or an aromatic ring having 6 to 20 carbon atoms; the aliphatic ring or the aromatic ring may be substituted with a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 12 carbon atoms, or an aryl having 6 to 12 carbon atoms.

[0087] The above Q can be Si, and

[0088] The above M may be Ti,

[0089] The above X1 and X2 may each independently be hydrogen; halogen; alkyl having 1 to 12 carbon atoms; cycloalkyl having 3 to 12 carbon atoms; alkenyl having 2 to 12 carbon atoms; aryl having 6 to 12 carbon atoms; alkylaryl having 7 to 13 carbon atoms; aryl alkyl having 7 to 13 carbon atoms; alkylamino having 1 to 13 carbon atoms; arylamino having 6 to 12 carbon atoms; or alkylidene having 1 to 12 carbon atoms.

[0091] More preferably, in the transition metal compound of Formula 1 above,

[0092] The above R1 may be hydrogen; an alkyl having 1 to 12 carbon atoms; a cycloalkyl having 3 to 12 carbon atoms; an alkoxy having 1 to 12 carbon atoms; an aryl having 6 to 12 carbon atoms; an arylalkoxy having 7 to 13 carbon atoms; an alkylaryl having 7 to 13 carbon atoms; or an arylalkyl having 7 to 13 carbon atoms.

[0093] The above R 2a to R 2e Each can independently be hydrogen; a halogen; an alkyl having 1 to 12 carbon atoms; a cycloalkyl having 3 to 12 carbon atoms; an alkenyl having 2 to 12 carbon atoms; an alkoxy having 1 to 12 carbon atoms; or a phenyl, and

[0094] The above R3 may be hydrogen; halogen; alkyl having 1 to 12 carbon atoms; cycloalkyl having 3 to 12 carbon atoms; alkenyl having 2 to 12 carbon atoms; alkylaryl having 7 to 13 carbon atoms; arylalkyl having 7 to 13 carbon atoms; phenyl; or phenyl substituted with one or more selected from the group consisting of halogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, alkenyl having 2 to 12 carbon atoms, alkoxy having 1 to 12 carbon atoms, and phenyl.

[0095] The above R4 to R9 may each independently be hydrogen; an alkyl having 1 to 12 carbon atoms; a cycloalkyl having 3 to 12 carbon atoms; an aryl having 6 to 12 carbon atoms; an alkylaryl having 7 to 13 carbon atoms; or an arylalkyl having 7 to 13 carbon atoms.

[0096] Two or more adjacent R6 to R9 can be connected to each other to form an aliphatic ring having 5 to 12 carbon atoms or an aromatic ring having 6 to 12 carbon atoms;

[0097] The above aliphatic ring or aromatic ring may be substituted with a halogen, an alkyl having 1 to 12 carbon atoms, an alkenyl having 2 to 12 carbon atoms, or an aryl having 6 to 12 carbon atoms, and

[0098] The above Q can be Si, and

[0099] The above M may be Ti,

[0100] The above X1 and X2 may each independently be hydrogen; a halogen; an alkyl group having 1 to 12 carbon atoms; or an alkenyl having 2 to 12 carbon atoms.

[0102] More preferably, in the transition metal compound of Formula 1,

[0103] The above R1 may be hydrogen or an alkyl having 1 to 12 carbon atoms, and

[0104] The above R 2a to R 2e Each can independently be hydrogen; an alkyl having 1 to 12 carbon atoms; or an alkoxy having 1 to 12 carbon atoms, and

[0105] The above R3 may be hydrogen; an alkyl having 1 to 12 carbon atoms; or a phenyl, and

[0106] The above R4 and R5 may each independently be hydrogen; or an alkyl having 1 to 12 carbon atoms, and the above R6 to R9 may each independently be hydrogen or methyl, and

[0107] The above Q can be Si, and

[0108] The above M may be Ti,

[0109] The above X1 and X2 may each independently be hydrogen or an alkyl group having 1 to 12 carbon atoms.

[0111] (C) Talc with an average particle size of 2 to 7 µm

[0112] The above (C) talc may preferably have an average particle size of 2 to 6 μm, more preferably 3 to 5 μm, and has the advantage of excellent fluidity and mechanical properties within this range.

[0113] In this document, the average particle size is calculated by measuring at least 30 particles using a Scanning Electron Microscope (SEM) and then calculating the average value.

[0115] The above (C) talc may be, for example, 20 to 28 weight%, preferably 22 to 26 weight%, more preferably 23 to 25 weight% with respect to 100 weight% of the total composition of (A) to (C), and within this range, there is an effect of excellent fluidity and suppression of flow mark occurrence.

[0117] In this description, talc is not particularly limited as long as it follows the definition of the present invention, and commercially available products may be used.

[0119] (D) Hindered amine-based light stabilizer

[0120] The above thermoplastic resin composition may include, for example, a hindered amine-based light stabilizer.

[0121] The above hindered amine-based light stabilizer is, for example, poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]](Poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]), bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, One or more selected from the group consisting of decane-2-acid bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidinyl) ester, 1,1-dimethylethylhydroperoxide, bis(1,2,2,6,6-pentamethyl-4-piperidyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butylmaloenite, bis(1,2,2,6,6-pentamethyl-4-piperidyl)-sebacate, and methyl-1,2,2,6,6-pentamethyl-4-piperidyl sebacate, preferably It may be poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]], in which case there is an advantage of improved heat resistance and prevention of discoloration while maintaining mechanical strength.

[0122] The light stabilizer (D) above may be, for example, 0.1 to 0.5 weight%, preferably 0.2 to 0.4 weight%, based on 100 weight% of the total composition of (A) to (D), and within this range, there is an effect of having excellent mechanical properties and further improving heat resistance and flexural strength retention.

[0124] Thermoplastic resin composition

[0125] The above thermoplastic resin composition preferably has a melt index (230°C, 2.16 kg) of 60 to 70 g / 10 min and an Izod impact strength of 7.5 KJ / m² measured by a notched specimen with a thickness of 4 mm in accordance with ISO 180. 2 Above, within this range, there is an excellent balance of physical properties, the ability to inject large injection molded parts, and the suppression of flow marks, which has the advantage of an excellent surface appearance.

[0126] The above melt index is measured under 2.16 kg after holding at 230°C for 6 minutes in accordance with ISO 1133-1.

[0128] The above thermoplastic resin composition may more preferably have a melt index (230°C, 2.16 kg) of 62 to 68 g / 10 min, more preferably 64 to 68 g / 10 min, and even more preferably 65 to 67 g / 10 min. Within this range, the balance of physical properties is excellent, large injection molded products can be produced, and the occurrence of flow marks is suppressed, resulting in an excellent surface appearance.

[0130] The above thermoplastic resin composition is more preferably an Izod impact strength of 8 kJ / m² as measured according to ISO 180. 2 Above, more preferably 8 to 11 kJ / m 2 , more preferably 8.5 to 10.5 kJ / m 2 It can be, and within this range, there is an advantage of excellent surface appearance with a balance of physical properties and suppressed flow mark generation.

[0132] The above thermoplastic resin composition may preferably have a flexural modulus of 1750 MPa or more, more preferably 1900 MPa or more, even more preferably 1900 to 2300 MPa, and even more preferably 2000 to 2200 MPa, measured in accordance with ISO 178 under a specimen thickness of 4 mm, a span of 64 mm, and a test speed of 2 mm / min. Within this range, there is an advantage of excellent balance of physical properties and suppression of flow mark occurrence, resulting in an excellent surface appearance.

[0134] The above thermoplastic resin composition preferably has the effect of being applicable to large injection-molded products without painting when a specimen is injection-molded in a wide spiral with a width of 290 nm and a thickness of 2T using an injection molding machine (ENGEL, 150N) at an injection temperature of 210 to 230°C, a holding pressure of 18 to 23 bar, a mold temperature of 40 to 60°C, and an injection speed of 0 mm / min, and when the specimen is visually observed under natural light, no flow marks are observed.

[0135] Generally, when observing the occurrence of flow marks during injection molding with a wide spiral, injection is performed by controlling the holding pressure conditions.

[0137] additives

[0138] The above thermoplastic resin composition may include one or more selected from the group consisting of antioxidants, release agents, reinforcing agents, fillers, weather stabilizers, antistatic agents, nucleating agents, flame retardants, pigments, and dyes, in an amount of 0.01 to 3 parts by weight each, preferably 0.05 to 2 parts by weight, based on 100 parts by weight of the total composition of (A) to (C). In this case, the necessary properties are effectively realized without degrading the inherent properties of the thermoplastic resin composition described herein.

[0139] The above antioxidant may include, for example, a phenolic antioxidant, a phosphorus-based antioxidant, or a mixture thereof, and preferably may be a phenolic antioxidant, in which case it prevents oxidation caused by heat during the extrusion process and has the effect of excellent mechanical properties and heat resistance.

[0140] The above-mentioned phenolic antioxidants are, for example, N,N'-hexane-1,6-diyl-bis[3-(3,5-di-t-butyl-4-hydroxyphenylpropionamide)], pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], N,N'-hexamethylene-bis(3,5-di-t-butyl-4-hydroxy-hydrocinnamamide), triethylene glycol-bis[3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate], 3,5-di-t-butyl-4-hydroxybenzylphosphonate-diethyl ester, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, and It may be one or more selected from the group consisting of 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, and in this case, heat resistance can be greatly improved while maintaining a high balance of physical properties.

[0141] The above phosphorus-based antioxidants are, for example, triphenylphosphite, tris(nonylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, tris(2,6-di-tert-butylphenyl)phosphite, tridecylphosphite, trioctylphosphite, trioctadecylphosphite, didecylmonophenylphosphite, dioctylmonophenylphosphite, diisopropylmonophenylphosphite, monobutyldiphenylphosphite, monodecyldiphenylphosphite, monooctyldiphenylphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octylphosphite, bis(nonylphenyl)pentaerythritol diphosphite, It may be one or more selected from the group consisting of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, stearylpentaerythritol diphosphite, tributyl phosphate, triethyl phosphate, and trimethyl phosphate.

[0143] The above antioxidant may preferably be included in an amount of 0.05 to 1 part by weight, more preferably 0.1 to 0.8 parts by weight, and even more preferably 0.2 to 0.6 parts by weight per 100 parts by weight of the total composition of (A) to (C), and within this range, it has the effect of preventing oxidation by heat during the extrusion process and having excellent mechanical properties.

[0145] The above-mentioned release agent may be one or more selected from the group consisting of, for example, metal soap-based release agents, organic fatty acid ester-based release agents, synthetic waxes, and fatty acid amide-based release agents, and preferably a fatty acid amide-based release agent, in which case the molded product is easily demolded from the mold.

[0147] The above metal soap-based release agent is, for example, one or more selected from the group consisting of zinc laurylate, calcium laurate, zinc stearate, calcium stearate, aluminum stearate, magnesium stearate, zinc myristate, calcium moncarbonate, zinc moncarbonate, aluminum moncarbonate, calcium behenate, magnesium behenate, and zinc behenate.

[0148] The above organic fatty acid ester-based release agent may be, for example, a montanic partially saponified ester, a polymeric complex ester, or a mixture thereof.

[0149] The above synthetic wax may be, for example, a modified hydrocarbon-based wax, a mineral oil-based synthetic wax, or a mixture thereof.

[0150] The above fatty acid amide-based release agent may be, for example, one or more selected from the group consisting of erucic acid amide, stearic acid amide, oleic acid amide, ethylenebis stearic acid amide, ethylenebis oleic acid amide, and ethylenebis lauryl acid amide.

[0151] The above release agent may be, for example, 0.01 to 1 part by weight, preferably 0.1 to 0.7 parts by weight, more preferably 0.1 to 0.5 parts by weight, based on a total of 100 parts by weight of compositions (A) to (C), and in this case, there is an effect of excellent processability and appearance quality.

[0153] Method for manufacturing a thermoplastic resin composition

[0154] The method for manufacturing a thermoplastic resin composition according to the present invention is characterized by comprising the step of preparing a thermoplastic resin composition by kneading and extruding under conditions of 200 to 300°C and 100 to 300 rpm, including (A) 54 to 62 weight% of a polypropylene resin with a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min, (B) 14 to 22 weight% of a polyolefin-based polymer with a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min, and (C) 20 to 28 weight% of talc with an average particle size of 2 to 7 μm. In this case, both impact resistance and fluidity are excellent, and the occurrence of flow marks is suppressed, so there is an advantage that it can be applied to exterior parts of large vehicles with high quality without painting.

[0156] The above mixing and extrusion can be performed, for example, through a single-screw extruder, a twin-screw extruder, or a Banbury mixer, in which case the composition is uniformly dispersed, resulting in excellent compatibility.

[0157] The above mixing and extrusion can be performed, for example, within a barrel temperature range of 200 to 300°C, preferably 220 to 260°C, and in this case, there is an advantage of excellent throughput per unit time and not causing problems such as thermal decomposition of resin components.

[0158] The above mixing and extrusion can be performed, for example, under conditions where the screw rotation speed is 100 to 300 rpm, preferably 150 to 300 rpm, more preferably 200 to 300 rpm, and even more preferably 230 to 270 rpm, in which case there is an effect of excellent throughput and process efficiency per unit time.

[0160] The thermoplastic resin composition obtained through the above mixing and extrusion can preferably be provided in the form of pellets.

[0162] molded product

[0163] The molded article of the present invention is characterized by comprising the thermoplastic resin composition of the present invention, and in this case, both impact resistance and fluidity are excellent, and the occurrence of flow marks is suppressed when injecting large injection-molded products, so there is an advantage that it can be applied to large vehicle exterior parts with high quality without painting.

[0164] The above-mentioned molded product may be, for example, an injection molded unpainted (MIC, Mold in colored) product, preferably an exterior part of a large vehicle, and more preferably a side cover for a camper van, a front grille for a large truck, or a side sill for a large truck.

[0166] The method for manufacturing a molded article according to the present invention preferably comprises the steps of: (A) 54 to 62 weight% of a polypropylene resin having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min; (B) 14 to 22 weight% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min; and (C) 20 to 28 weight% of talc having an average particle size of 2 to 7 μm, by kneading and extruding under conditions of 200 to 300°C and 100 to 300 rpm to produce a thermoplastic resin composition pellet; and the step of manufacturing a molded article by injection molding the produced pellet. In this case, both impact resistance and fluidity are excellent, and the occurrence of flow marks is suppressed when injecting large injection-molded articles, so there is an advantage that it can be applied to large vehicle exterior parts with high quality without painting.

[0168] The above-mentioned pellets can be manufactured by sufficiently drying them using, for example, a dehumidifying dryer or a hot air dryer, and then performing injection molding.

[0169] The above injection is not particularly limited when based on methods and conditions commonly used in the technical field to which the present invention belongs, and can be appropriately selected and applied as needed.

[0171] In describing the thermoplastic resin compositions, molded articles, and methods for manufacturing the same, it is specified that other conditions not specifically stated (e.g., configuration or specifications of extruders and injection molding machines, extrusion and injection molding, additives, etc.) are not particularly limited and may be appropriately selected and implemented as needed, provided they fall within the scope of practices commonly carried out in the industry.

[0173] The present invention will be described below with reference to the drawings.

[0174] Figure 1 below is a photograph showing the occurrence of flow marks by injecting a wide spiral specimen, where the left side is the specimen according to Comparative Example 1 and the right side is the specimen according to Example 1.

[0175] Example 1 according to the present invention has the advantage of allowing the application of a paintless method without undergoing a painting process, as no flow marks occur. On the other hand, Comparative Example 1 generates a wave-like pattern due to flow marks, so a painting process is required to conceal them.

[0177] Hereinafter, preferred embodiments are presented to aid in understanding the description; however, the following embodiments are merely illustrative of the description, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the description, and that such variations and modifications fall within the scope of the appended claims.

[0179] [Example]

[0180] The materials used in the following examples and comparative examples are as follows.

[0181] * (a-1) High-crystalline impact polypropylene resin: Melt index (230℃, 2.16 kg load): 80~120 g / 10 min, 13 Isotactic pentad fraction by C-NMR: 96 wt% or more, impact strength measured at room temperature (20–25°C) according to ASTM D256: 6 kgf·cm / cm

[0182] * (a-2) High-crystalline impact polypropylene resin: Melt index (230℃, 2.16 kg load): 20~40 g / 10 min, Impact strength measured at room temperature (20~25℃) according to ASTM D256: 7.0 kgf·cm / cm

[0183] * (b-1) Polyolefin polymer: Ethylene-1-butene rubber (melt index (190℃, 2.16 kg load) 30~40 g / 10 min)

[0184] * (b-2) Polyolefin polymer: Ethylene-1-butene rubber (melt index (190℃, 2.16 kg load) 5~10 g / 10 min)

[0185] * (c-1) Talc: Average particle size 4.0 ± 0.5 µm

[0186] * (c-2) Talc: Average particle size 11.0 ± 2.0 µm

[0188] Examples 1 to 5 and Comparative Examples 1 to 9

[0189] (a) polypropylene, (b) a polyolefin-based polymer, and (c) talc were uniformly mixed using a Henschel mixer in the amounts listed in Tables 1 and 2 below, and melt-extruded using a twin-screw extruder (screw diameter 40Φ) at an extrusion temperature of 220°C, a screw rotation speed of 250 rpm, and a feed rate of 50 kg / hr to produce a thermoplastic resin composition in the form of pellets.

[0190] A resin composition in the form of pellets was dehumidified and dried in a hot air dryer at 80 to 100°C for at least 4 hours, and then injection molded at 210 to 230°C to produce a specimen, which was then left at 20 to 26°C for at least 48 hours before measuring physical properties.

[0192] [Test Example]

[0193] The characteristics of the specimens prepared in Examples 1 to 5 and Comparative Examples 1 to 9 were measured in the following manner, and the results are shown in Tables 1 and 2 below.

[0195] measurement method

[0196] * Melt index (g / 10min): Measured at 2.16 kg after holding at 230°C for 6 minutes in accordance with ISO 1133-1.

[0197] * Izod impact strength (KJ / m²) 2 ): Measured using a notched specimen with a thickness of 4 mm in accordance with ISO 180.

[0198] * Flexural modulus (MPa): Measured according to ISO 178 with a specimen thickness of 4 mm, a span of 64 mm, and a test speed of 2 mm / min.

[0199] * Appearance Quality: The surface of the injection molded specimen was observed; "○" was marked if the surface was excellent with no flow marks, and "X" was marked if the surface was poor with flow marks.

[0201] Classification (Weight%) Example 1 Example 2 Example 3 Example 4 Example 5 (a-1) 58 60 60 56 56 (a-2) (b-1) 18 16 18 18 20 (c-1) 24 24 22 26 24 (c-2) Physical properties Melt index (g / 10min) 65 67 66 64 62 Izod impact strength (KJ / m²) 2 ) 9 8 9.5 8 10 Flexural modulus (MPa) 2000 2100 1850 2100 1900 Appearance quality ○ ○ ○ ○ ○

[0202] Classification (Weight%) Comparative example 1 2 3 4 5 6 7 8 9 (a-1) 58 58 70 67 49 44 58 58 (a-2) 58 (b-1) 18 18 18 9 27 18 30 5 (b-2) 18 (c-1) 24 24 12 24 24 38 12 37 (c-2) 24 Physical properties Melt index (g / 10min) 25 45 60 67 73 54 58 55 75 Izod impact strength (KJ / m²) 2 ) 15 17 7 11 4.5 12 5 14 3 Flexural modulus (MPa) 1850 1800 1850 1200 2200 1600 2500 900 3000 Appearance quality X X ○ ○ ○ X X X X

[0204] As shown in Tables 1 and 2 above, the thermoplastic resin compositions of the present invention (Examples 1 to 5) were found to have excellent mechanical properties such as impact strength and flexural modulus, and had a melt index of 62 g / 10 min or higher, allowing for the injection of large injection molded products without the occurrence of flow marks.

[0205] On the other hand, Comparative Example 1, containing a polypropylene resin with a flow index of 20 to 40 g / 10 min, and Comparative Example 2, containing ethylene-1-butene rubber, both had poor melt index, flexural modulus, and appearance quality.

[0206] In addition, Comparative Example 3, which used talc with an average particle size of 11.0 ± 2.0 μm, showed a decrease in flexural modulus.

[0207] In addition, Comparative Example 4, which contained an excess of (a-1) polypropylene and a small amount of (c-1) talc, showed a significantly reduced flexural modulus, and Comparative Example 7, which contained a small amount of (a-1) polypropylene and an excess of (c-1) talc, showed poor impact strength and appearance quality.

[0208] In addition, Comparative Example 5, which contained an excess of (a-1) polypropylene and a small amount of (b-1) ethylene-1-butene rubber, had low impact strength, and Comparative Example 6, which contained a small amount of (a-1) polypropylene and an excess of (b-1) ethylene-1-butene rubber, had deteriorated melt index, flexural modulus, and appearance quality.

[0209] In addition, Comparative Example 8, which contained an excess of (b-1) ethylene-1-butene rubber and a small amount of (c-1) talc, had poor melt index, flexural modulus, and appearance quality, and Comparative Example 9, which contained a small amount of (b-1) ethylene-1-butene rubber and an excess of (c-1) talc, had a melt index that was too high, which actually lowered the appearance quality and also lowered the impact strength.

[0211] In conclusion, it was confirmed that a thermoplastic resin composition according to the present invention, in which the melt index of each polypropylene and polyolefin-based polymer is adjusted to within a predetermined range and fine talc is included within a predetermined range, exhibits excellent fluidity and impact resistance, and suppresses the occurrence of flow marks in large injection-molded products, thereby eliminating the need for a coating process.

Claims

Claim 1 (A) 56 to 60 wt% of polypropylene having a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min; (B) 16 to 20 wt% of a polyolefin-based polymer having a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min; and (C) 22 to 26 wt% of talc having an average particle size of 3 to 5 μm; wherein the melt index (230°C, 2.16 kg) is 60 to 70 g / 10 min, and the Izod impact strength measured by a notched specimen with a thickness of 4 mm at room temperature (20–25°C) according to ISO 180 is 8 KJ / m² 2 A thermoplastic resin composition characterized by the above. Claim 2 delete Claim 3 A thermoplastic resin composition according to claim 1, wherein the (B) polyolefin-based polymer is a polyolefin-based elastomer. Claim 4 A thermoplastic resin composition according to claim 1, wherein the above (A) polypropylene is an impact polypropylene having a melt index (230℃, 2.16 kg) of 60 to 140 g / 10 min and an impact strength of 5 kgf·cm / cm or more as measured at room temperature (20~25℃) according to ASTM D256. Claim 5 In paragraph 1, the above (A) polypropylene resin is 13 A thermoplastic resin composition characterized by being a highly crystalline polypropylene having an isotactic pentad fraction of 96 weight% or more as determined by C-NMR. Claim 6 A thermoplastic resin composition according to claim 3, characterized in that the polyolefin-based elastomer is a rubber polymerized from ethylene and an α-olefin having 3 to 12 carbon atoms. Claim 7 A thermoplastic resin composition according to claim 6, wherein the α-olefin is one or more selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicocene, norbornene, norvonadiene, ethylidenenorbornene, phenylnorbornene, vinylnorbornene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, α-methylstyrene, divinylbenzene, and 3-chloromethylstyrene. Claim 8 A thermoplastic resin composition according to claim 1, characterized in that the thermoplastic resin composition comprises 0.1 to 0.5 weight% of (D) hindered amine-based light stabilizer based on 100 weight% of (A) polypropylene resin, (B) polyolefin-based polymer, (C) talc, and (D) hindered amine-based light stabilizer. Claim 9 A thermoplastic resin composition according to claim 1, characterized in that the thermoplastic resin composition has a flexural modulus of 1900 MPa or higher, measured in accordance with ISO 178 under a thickness of 4 mm, a span of 64 mm, and a test speed of 2 mm / min. Claim 10 The method comprises the step of preparing a thermoplastic resin composition by kneading and extruding under conditions of 200 to 300°C and 100 to 300 rpm, wherein the thermoplastic resin composition has a melt index (230°C, 2.16 kg) of 60 to 140 g / 10 min in the range of 60°C, (B) a polyolefin-based polymer with a melt index (190°C, 2.16 kg) of 20 to 50 g / 10 min in the range of 20°C, (C) 22 to 26 weight% of talc with an average particle size of 3 to 5 μm, and wherein the thermoplastic resin composition has a melt index (230°C, 2.16 kg) of 60 to 70 g / 10 min and an Izod impact strength of 8 as measured by a notched specimen with a thickness of 4 mm at room temperature (20 to 25°C) in accordance with ISO 180. KJ / m 2 A method for manufacturing a thermoplastic resin composition characterized by the above. Claim 11 A molded article characterized by comprising a thermoplastic resin composition according to any one of claims 1 and 3 to 9. Claim 12 In claim 11, the molded product is characterized as being an injection molded product that is unpainted (MIC, Mold in colored) molded product. Claim 13 In claim 11, the molded product is characterized as being an exterior part of a large vehicle.

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