KR-102963075-B1 - THERMOPLASTIC RESIN COMPOSITION, METHOD FOR PREPARING THE THERMOPLASTIC RESIN COMPOSITION AND MOLDING PRODUCTS THEREOF

Abstract

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, a method for manufacturing the same, and a molded article comprising the same, wherein the composition comprises (A) 72 to 87 weight% of a polyester resin having an intrinsic viscosity of 0.7 to 1.5 dl/g; (B) 12 to 26 weight% of a glycidyl group-modified olefinic rubber polymer; (C) 0.1 to 3 weight% of an ester-based lubricant; and (D) 0.05 to 1.5 weight% of a dendritic polymer; wherein the glycidyl group-modified olefinic rubber polymer (B) comprises 1 to 2.2 weight% of glycidyl (meth)acrylate based on the total weight thereof. According to the present invention, there is an effect of providing a thermoplastic resin composition that is capable of high-quality application to automotive interior and exterior materials of complex structures requiring high strength, high impact, and excellent moldability, having excellent impact resistance and fluidity, a method for manufacturing the same, and a molded article including the same.

Inventors

• 김영완
• 김경문
• 이현석
• 서인석
• 김형석

Assignees

• 주식회사 엘지화학

Dates

Publication Date

20260512

Application Date

20210224

Claims (13)

1. (A) 72 to 87 weight% of a polyester resin having an intrinsic viscosity of 0.7 to 1.5 dl/g; (B) 12 to 26 weight% of glycidyl-modified olefinic rubber polymer; (C) 0.1 to 3 weight% of an ester-based lubricant; and (D) 0.05 to 1.5 weight% of dendritic polymer; comprising, The above (B) glycidyl group-modified olefinic rubber polymer comprises 1 to 2.2 weight percent of glycidyl (meth)acrylate based on the total weight thereof, and The Izod impact strength measured at 23℃ with a specimen thickness of 4mm in accordance with ISO 179/1ea is 37 kJ/ m² or higher, and Characterized by a flow index of 19 g/10 min or higher measured under conditions of 250℃ and 5 kg in accordance with ISO 1133 Thermoplastic resin composition.
2. In paragraph 1, The above (A) polyester resin is characterized by being one or more selected from the group consisting of polyethylene adipate (PEA), polybutylene succinate (PBS), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), and polyethylene naphthalate (PEN). Thermoplastic resin composition.
3. In paragraph 1, The above (B) glycidyl group-modified olefin rubber polymer is characterized as being a glycidyl (meth)acrylate grafted polyolefin copolymer (GMA-g-POE). Thermoplastic resin composition.
4. In paragraph 1, The above (C) ester-based lubricant is characterized by being one or more selected from the group consisting of fatty acid esters of alcohols, hydrogenated oils, butyl stearate, monoglycerides of stearate, pentaerythritol tetrastearate, stearyl stearate, ester waxes, and alkyl phosphate esters. Thermoplastic resin composition.
5. In paragraph 1, The above (D) dendritic polymer is characterized as being a dendrimer, a hyperbranched polymer, or a mixture thereof. Thermoplastic resin composition.
6. In paragraph 1, The above (D) dendritic polymer is characterized by having one or more terminal functional groups selected from the group consisting of hydroxyl groups, sulfohydryl groups, amino groups, carboxyl groups, aldehyde groups, and epoxy groups. Thermoplastic resin composition.
7. In paragraph 5, The above dendrimer is characterized by being a compound represented by the following chemical formula 2. Thermoplastic resin composition. [Chemical Formula 2] (In the above Chemical Formula 2, R is an alkyl group having 3 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms, m is an integer from 1 to 5, and n is an integer from 1 to 10.)
8. In paragraph 5, The above dendrimer is characterized by being a compound represented by the following chemical formula 3 or 4. Thermoplastic resin composition. [Chemical Formula 3] [Chemical Formula 4]
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11. A thermoplastic resin composition is prepared by including the step of mixing (A) 72 to 87 weight% of a polyester resin having an intrinsic viscosity of 0.7 to 1.5 dl/g, (B) 12 to 26 weight% of a glycidyl-modified olefinic rubber polymer, (C) 0.1 to 3 weight% of an ester-based lubricant, and (D) 0.05 to 1.5 weight% of a dendritic polymer, and then melt-kneading and extruding under conditions of 200 to 330°C. The above (B) glycidyl group-modified olefinic rubber polymer comprises 1 to 2.2 weight percent of glycidyl (meth)acrylate based on the total weight thereof. The above thermoplastic resin composition has an Izod impact strength of 37 kJ/ m² or higher, measured at 23°C with a specimen thickness of 4 mm in accordance with ISO 179/1ea, and Characterized by a flow index of 19 g/10 min or higher measured under conditions of 250℃ and 5 kg in accordance with ISO 1133 Method for manufacturing a thermoplastic resin composition.
12. Characterized by comprising a thermoplastic resin composition according to any one of claims 1 to 8. Molded product.
13. In Paragraph 12, The above-mentioned molded product is characterized as being an interior or exterior material for automobiles. Molded product.

Description

Thermoplastic resin composition, method for preparing the same, and molding products containing the same The present invention relates to a thermoplastic resin composition, a method for manufacturing the same, and a molded article comprising the same. More specifically, it relates to a thermoplastic resin composition that is capable of high-quality application to automotive interior and exterior materials of complex structures requiring high strength, high impact, and excellent moldability, having both excellent impact resistance and fluidity, a method for manufacturing the same, and a molded article comprising the same. Polybutylene terephthalate (hereinafter referred to as 'PBT'), a polyester resin, is included among the five major general-purpose engineering plastics due to its excellent electrical properties and superior moldability, and its usage continues to increase. However, due to the lack of impact resistance, PBT resin frequently causes breakage in the final product when used alone. To improve this, mixing glass fibers into PBT resin increases impact strength, but it results in uneven surface characteristics, such as the protrusion of glass fibers. Additionally, using additive impact modifiers in PBT resin reduces fluidity, leading to poor moldability. Therefore, there is a need to develop thermoplastic resin compositions containing PBT resin that exhibit both excellent impact resistance and fluidity. 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. The inventors confirmed that when a glycidyl group-modified olefin rubber polymer containing a predetermined amount of glycidyl (meth)acrylate, an ester-based lubricant, and a dendritic polymer are included in a predetermined amount in a polyester resin, the impact strength is excellent and the fluidity is excellent, and the moldability is greatly improved. Based on this, they further devoted themselves to research and completed the present invention. The thermoplastic resin composition according to the present description is described in detail as follows. The thermoplastic resin composition of the present invention comprises (A) 72 to 87 weight% of a polyester resin having an intrinsic viscosity of 0.7 to 1.5 dl/g; (B) 12 to 26 weight% of a glycidyl group-modified olefin-based rubber polymer; (C) 0.1 to 3 weight% of an ester-based lubricant; and (D) 0.05 to 1.5 weight% of a dendritic polymer; wherein the glycidyl group-modified olefin-based rubber polymer (B) comprises 1 to 2.2 weight% of glycidyl (meth)acrylate relative to the total weight thereof, and in this case, both impact resistance and fluidity are excellent, so there is an advantage of being able to apply it to high-quality automotive interior and exterior materials with complex structures that require high strength, high impact, and excellent moldability. The thermoplastic resin composition of the present invention will be described in detail below according to its components. (A) Polyester resin The above polyester resin (A) may be, for example, 72 to 87 weight%, preferably 75 to 85 weight%, more preferably 78 to 85 weight% with respect to the total weight of components (A), (B), (C), and (D), and within this range, both impact resistance and fluidity are excellent, so it has the effect of being applicable to high-quality automotive interior and exterior materials with complex structures that require high strength, high impact, and excellent moldability. The above (A) polyester resin is, for example, one or more selected from the group consisting of polyethylene adipate (PEA), polybutylene succinate (PBS) resin, polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, polytrimethylene terephthalate (PTT) resin, and polyethylene naphthalate (PEN) resin, and preferably may be polybutylene terephthalate resin, in which case the overall mechanical properties of the composition are good, so there is an advantage of being easy to mold while having excellent balance of properties. The above polybutylene terephthalate resin is not particularly limited to conventional polybutylene terephthalate resin and may, for example, be a polymer formed by the condensation polymerization of 1,4-butanediol and dimethyl terephthalate or a polymer formed by the esterification reaction of terephthalic acid and 1,4-butanediol. The above method for manufacturing the polyester resin (A) is not particularly limited if it is a manufacturing method commonly used in the technical field to which the present invention belongs. The above (A) polyester resin may, for example, have an intrinsic viscosity of 0.7 to 1.5 dl/g, preferably 0.9 to 1.4 dl/g, and more preferably 1 to 1.3 dl/g. Within this range, the composition has excellent impact resistance, and in particular, the melt index is appropriate, resulting in excellent processability, moldability, and molding stability. If the in