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KR-20260063595-A - THERMOPLASTIC RESIN COMPOSITION FOR VACUUM FORMING AND ARTICLE PRODUCED THEREFROM

KR20260063595AKR 20260063595 AKR20260063595 AKR 20260063595AKR-20260063595-A

Abstract

One embodiment of the present specification provides a thermoplastic resin composition for vacuum molding comprising: a rubber-modified styrene copolymer mixture comprising a first rubber-modified styrene copolymer having an average rubber particle size of 1 to 7 μm and a second rubber-modified styrene copolymer having an average rubber particle size of 8 to 15 μm in a weight ratio of 2 to 5:1; and polypropylene.

Inventors

  • 최성규
  • 김진성
  • 김유석
  • 오진평
  • 이주한

Assignees

  • 금호석유화학 주식회사

Dates

Publication Date
20260507
Application Date
20241030

Claims (16)

  1. A rubber-modified styrene copolymer mixture comprising a first rubber-modified styrene copolymer having an average rubber particle size of 1 to 7 μm and a second rubber-modified styrene copolymer having an average rubber particle size of 8 to 15 μm in a weight ratio of 2 to 5:1; and A thermoplastic resin composition for vacuum forming comprising polypropylene.
  2. In paragraph 1, A thermoplastic resin composition for vacuum molding, wherein the weight ratio of the rubber-modified styrene-based copolymer mixture to the polypropylene is 2 to 6:1.
  3. In paragraph 1, A thermoplastic resin composition for vacuum molding, wherein the rubber content included in the first rubber-modified styrene-based copolymer is 5 to 10 weight percent based on the total weight of the first rubber-modified styrene-based copolymer.
  4. In paragraph 1, A thermoplastic resin composition for vacuum molding, wherein the number average molecular weight of the first rubber-modified styrene-based copolymer is 180,000 to 240,000 g/mol.
  5. In paragraph 1, A thermoplastic resin composition for vacuum molding, wherein the rubber content included in the second rubber-modified styrene-based copolymer is 8 to 12 weight percent based on the total weight of the second rubber-modified styrene-based copolymer.
  6. In paragraph 1, A thermoplastic resin composition for vacuum molding, wherein the number average molecular weight of the second rubber-modified styrene copolymer is 160,000 to 220,000 g/mol.
  7. In paragraph 1, A thermoplastic resin composition for vacuum forming, wherein the melt index (ASTM D1238, 230℃, 2.16kg) of the above polypropylene is 0.1 to 1.0 g/10 min.
  8. In paragraph 1, A thermoplastic resin composition for vacuum forming, further comprising mineral oil.
  9. In paragraph 1, A thermoplastic resin composition for vacuum forming having a tensile strength of 250 kgf/ cm² or more as measured at 23°C in accordance with ASTM D638.
  10. In paragraph 1, A thermoplastic resin composition for vacuum forming having an elongation of 70% or more as measured at 23°C in accordance with ASTM D638.
  11. In paragraph 1, A thermoplastic resin composition for vacuum forming having a tensile strength of 10 kgf/ cm² or more as measured at 130°C in accordance with ASTM D638.
  12. In paragraph 1, A thermoplastic resin composition for vacuum forming having an elongation of 1,750% or more as measured at 130°C in accordance with ASTM D638.
  13. In paragraph 1, A thermoplastic resin composition for vacuum forming having a flexural strength of 350 kgf/ cm² or more as measured at 23°C according to ASTM D790.
  14. In paragraph 1, A thermoplastic resin composition for vacuum forming having a flexural modulus of 15,000 kgf/ cm² or higher as measured at 23°C according to ASTM D790.
  15. In paragraph 1, A thermoplastic resin composition for vacuum forming, having a flame retardancy of V-0 grade for a 2.0 mm thick specimen measured according to the UL-94 test method.
  16. A molded article made of a thermoplastic resin composition for vacuum molding according to any one of claims 1 to 15.

Description

Thermoplastic resin composition for vacuum forming and molded article produced therefrom This specification relates to a thermoplastic resin composition for vacuum forming and a molded article made therefrom. In the secondary battery market and other markets, there is a demand for the development of materials that can improve the safety of large parts by reducing movement of large parts through maximizing the vacuum forming height of the packaging material to match the dimensions of large parts. Conventionally, general or flame-retardant ABS (Acrylonitrile Butadiene Styrene) or HIPS (High Impact Polystyrene) materials have been used as vacuum forming materials. However, conventional vacuum forming materials such as ABS or HIPS have a maximum vacuum forming height of less than 100 mm, which presents a problem in that it is difficult to package large parts exceeding this height. Furthermore, when these materials are vacuum formed to their maximum height, the molded part becomes thin to a minimum thickness, resulting in a decrease in the flexural strength of the molded part and causing the molded product to break due to movement of the part. Accordingly, a method of making the extruded sheet thicker has been used, but this has the disadvantage of requiring an increase in the amount of resin to raise the vacuum forming height to the height of the final target part. Therefore, there is a need to develop a material that possesses flame-retardant properties equivalent to those of flame-retardant ABS or flame-retardant HIPS materials, and can be vacuum formed to a height of 100 mm or more even when operated with an extrusion sheet thickness equivalent to those materials. In addition, there is a need to develop a vacuum forming material that has excellent flexibility properties, which can improve safety by reducing movement of parts during packaging via vacuum forming of large parts. Hereinafter, one aspect of this specification will be described based on specific examples. However, the details described in this specification may be implemented in various different forms and are therefore not limited to the embodiments described herein. Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components. Terms including ordinal numbers, such as ‘first’ or ‘second’ as used in this specification, may be used to describe various components or steps, but such components or steps should not be limited by ordinal numbers. Terms including ordinal numbers should be interpreted solely for the purpose of distinguishing one component or step from other components or steps. When a range of numerical values is described in this specification, unless a specific range is otherwise described, the value has the precision of significant figures provided according to the standard rules in chemistry for significant figures. For example, 10 includes a range of 5.0 to 14.9, and the number 10.0 includes a range of 9.50 to 10.49. As used in this specification, the term "HIPS" means High Impact Polystyrene. Thermoplastic resin composition for vacuum forming A thermoplastic resin composition for vacuum forming according to one aspect of the present specification comprises: a rubber-modified styrene copolymer mixture comprising a first rubber-modified styrene copolymer having an average rubber particle size of 1 to 7 μm and a second rubber-modified styrene copolymer having an average rubber particle size of 8 to 15 μm in a weight ratio of 2 to 5:1; and polypropylene. The above-described thermoplastic resin composition for vacuum forming exhibits excellent flame-retardant properties and high tensile strength and elongation at high temperatures, enabling vacuum forming of large parts. Additionally, it offers excellent sheet extrusion and vacuum forming processability, allowing it to be applied to the vacuum forming of large parts. Furthermore, the above-described thermoplastic resin composition exhibits excellent flexural properties, which can improve safety by reducing part movement during packaging via vacuum forming of large parts. The above rubber-modified styrene-based copolymer may be a thermoplastic resin obtained by graft copolymerizing a styrene-based monomer in the presence of a rubber polymer, for example, a High Impact Polystyrene (HIPS) resin, and preferably a flame-retardant HIPS resin in which flame retardancy is imparted to the HIPS resin, but is not limited thereto. The above styrene-based monomer may be one selected from the group consisting of styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, monochlorostyrene, and combinations of two or more of these, but is not limited thereto. The average particle size of the rubber component included in the first rubber-modified styrene copolymer may be 1 to 7 μm. For exa