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KR-20260063840-A - Composite materials, automotive exterior materials comprising the same, and automotive outer panels comprising the same

KR20260063840AKR 20260063840 AKR20260063840 AKR 20260063840AKR-20260063840-A

Abstract

A composite material according to one embodiment of the present disclosure may include: a first prepreg comprising plant fibers; and a second prepreg disposed on the first prepreg and comprising mineral fibers. An automotive exterior material according to one embodiment of the present disclosure may include the composite material. An outer hood panel for an automobile according to one embodiment of the present disclosure may include the composite material.

Inventors

  • 신용현
  • 박상윤
  • 박상선

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (15)

  1. A first prepreg comprising plant fibers; and A composite material comprising a second prepreg disposed on the first prepreg and comprising mineral fibers.
  2. In paragraph 1, A composite material characterized by the above plant fiber including a surface modification layer.
  3. In paragraph 2, A composite material characterized in that the surface modification layer is hydrophobic.
  4. In paragraph 2, A composite material characterized in that the surface modification layer is surface modified with a silane-based compound.
  5. In paragraph 4, The above silane compound is A composite material characterized by comprising at least one selected from the group consisting of APS[(3-aminopropyl)trimethoxysilane], GPTMS(3-glycidoxypropyltrimethoxysilane), MPTMS(3-methacryloxypropyltrimethoxysilane), PFS(perfluorodecyltrichlorosilane), OTS(octadecyltrichlorosilane), OTMS(octadecyltrimethoxysilane), EDA[N-(2-aminoethyl)-3-aminopropyl trimethoxysilane], PFS(perfluorodecyltrichlorosilane), OTS(octadecyltrichlorosilane), and VTES(vinyltriethoxysilane).
  6. In paragraph 1, A composite material characterized in that the above plant fiber comprises at least one selected from the group consisting of flax fiber, hemp fiber, jute fiber, hemp fiber, lignin fiber, bamboo fiber, and cellulose fiber.
  7. In paragraph 1, A composite material characterized in that the mineral fiber comprises at least one selected from the group consisting of basalt fibers and asbestos fibers.
  8. In paragraph 1, The above first prepreg comprises a first resin, and A composite material characterized in that the first resin is included in an amount of 45 to 55 wt% relative to the total weight of the first prepreg.
  9. In paragraph 1, The above second prepreg includes a second resin, and A composite material characterized in that the second resin is included in an amount of 35 to 45 wt% relative to the total weight of the second prepreg.
  10. In Article 8 or 9, The above first resin or the above second resin is A composite material characterized by comprising at least one selected from the group consisting of epoxy resin, resol-type phenolic resin, and novolak-type phenolic resin.
  11. In paragraph 1, A composite material characterized by containing the above plant fibers in an amount of 50 to 80 weight percent relative to the total weight of the fibers.
  12. In paragraph 1, A composite material characterized by containing the mineral fiber in an amount of 20 to 50 weight percent relative to the total weight of the fiber.
  13. In paragraph 1, A composite material further comprising a third prepreg comprising mineral fibers, disposed facing the second prepreg on the first prepreg.
  14. An automobile exterior material comprising a composite material according to any one of paragraphs 1 to 13.
  15. An outer hood panel for an automobile comprising a composite material according to any one of paragraphs 1 to 13.

Description

Composite materials, automotive exterior materials comprising the same, and automotive outer panels comprising the same The present disclosure relates to a composite material, an automotive exterior material including the same, and an outer hood panel for an automobile including the same. Natural fibers are gaining attention as a replacement for glass and carbon fibers, which were previously used as reinforcing materials, because they can significantly reduce carbon dioxide emissions during production and disposal processes and simultaneously satisfy eco-friendliness and lightweighting by being used in various forms of reinforcement. Recently, various studies have been conducted to secure the mechanical properties of plant or mineral fibers for application in automotive exterior materials or structural body components. However, plant fibers have disadvantages, such as inferior properties compared to artificial fibers and vulnerability to external environmental factors like moisture and sunlight. While mineral fibers offer advantages regarding environmental aging, their high specific gravity makes it difficult to maximize weight reduction effects. Therefore, technology capable of overcoming these limitations is required to apply natural fibers as automotive exterior materials. FIG. 1 is a cross-sectional view of a composite material according to various embodiments of the present disclosure. Figure 2 is a cross-sectional view of the first prepreg. Figure 3 is an enlarged view of A in Figure 2. FIG. 4 is a perspective view of an outer hood panel for an automobile according to various embodiments of the present disclosure. Figure 5 shows the results of evaluating the tensile strength and tensile modulus in Example 2. Figure 6 is the result of the bending evaluation performed in Example 2. Figure 7 shows the results of measuring tensile strength and tensile strain for TYPE-1, TYPE-2, and TYPE-3 in Example 4. Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. In the following description, identical or similar components are given identical or similar reference numerals, and redundant descriptions thereof may be omitted. In this specification, terms such as "comprising" or "having" indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not exclude any of the features, numbers, steps, actions, components, parts, or combinations thereof. Various embodiments of the present disclosure relate to composite materials. A composite material (10) according to various embodiments of the present disclosure may include natural fibers. A composite material (10) according to various embodiments of the present disclosure may include plant fibers and mineral fibers. FIG. 1 is a cross-sectional view of a composite material according to various embodiments of the present disclosure. Referring to FIG. 1, a composite material (10) according to various embodiments of the present disclosure may include a first prepreg (100) and a second prepreg (210). The first prepreg (100) can be placed inside the composite material (10). The first prepreg (100) can be placed so as not to be exposed to the outside of the composite material (10). The first prepreg (100) may include plant fibers. The plant fibers may have a density of 0.5 g/cc to 2.0 g/cc. The plant fibers may include at least one selected from the group consisting of flax fibers, hemp fibers, jute fibers, hemp fibers, lignin fibers, bamboo fibers, and cellulose fibers. The plant fibers may be unidirectional and/or continuous fibers in the form of a fabric. The first prepreg (100) may be composed of a plurality of layers. The first prepreg (100) may include a plurality of plant fibers, including various unidirectional fibers and fabric fibers. The first prepreg (100) may be composed of 3 to 10 layers of plant fibers. The thickness of one ply of the first prepreg (100) may be 0.27 to 0.34 mm. The first prepreg (100) may include a laminated structure of [0/90/±45]s or [±45/0/90]s. Each number represents an angle or orientation formed by the plant fibers. The mechanical behavior of the composite material (10) may vary depending on the fiber angle and the ratio of the number of layers to the laminated angle. Therefore, in the present invention, the laminated structure can be varied to minimize thermal deformation and residual stress generation for lightweighting and high strength. Plant fibers may be included in an amount of 50 to 80 weight percent relative to the total weight of fibers included in the composite material (10). Here, "total fibers" refers to the sum of plant fibers and mineral fibers included in the composite material (10). If plant fibers are included in an amount of less than 50 weight percent relative to the total weight of fibers included in the composite material (10), the weight of mineral fibers increas