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KR-20260062201-A - METHOD FOR MANUFACTURING A SANDWICH COMPOSITE AND SANDWICH COMPOSITE

KR20260062201AKR 20260062201 AKR20260062201 AKR 20260062201AKR-20260062201-A

Abstract

The present invention relates to a method for manufacturing a sandwich composite and a sandwich composite manufactured thereby, comprising the steps of: preparing a core layer and a skin layer; applying an adhesive capable of curing by radiation to at least one surface of the core layer or one surface of the skin layer; and bonding the skin layer to one or more surfaces of the core layer and irradiating the bonding interface with radiation, wherein the radiation is irradiated at an irradiation dose of 50 kGy or more and 500 kGy or less, and the adhesive contains a photoinitiator in an amount of 2.5 wt% or more and 5.0 wt% or less.

Inventors

  • 전준표
  • 강필현
  • 정성린
  • 박종석
  • 손민호

Assignees

  • 한국원자력연구원

Dates

Publication Date
20260507
Application Date
20241025

Claims (11)

  1. Step of preparing the core layer and skin layer; A step of applying an adhesive curable by radiation to at least one surface of the core layer or one surface of the skin layer; and The method includes the step of bonding the skin layer to one or more surfaces of the core layer and irradiating the bonding interface with radiation. The above radiation is irradiated at an irradiation dose of 50 kGy or more and 500 kGy or less, and A method for manufacturing a sandwich composite, wherein the adhesive comprises a photoinitiator in an amount of 2.5% by weight or more and 5.0% by weight or less.
  2. In paragraph 1, A method for manufacturing a sandwich composite material in which the core layer comprises one or more materials selected from the group consisting of cork, polyurethane, polyvinyl chloride, polypropylene, polystyrene, aluminum, titanium, stainless steel, and cellulose.
  3. In paragraph 1, A method for manufacturing a sandwich composite material in which the skin layer comprises one or more materials selected from the group consisting of carbon fiber reinforced composite material, glass fiber reinforced composite material, aramid fiber reinforced composite material, thermoplastic plastic, thermosetting plastic, aluminum, and steel.
  4. In paragraph 1, A method for manufacturing a sandwich composite, wherein the adhesive comprises an epoxy resin and a crosslinking agent.
  5. In paragraph 4, A method for manufacturing a sandwich composite material in which the above-mentioned crosslinking agent is included in an amount of 0.5% by weight or more and 3.5% by weight or less with respect to the total content of the adhesive.
  6. In paragraph 1, The above photoinitiators are diarylsulfonium hexafluoroantimonate, diarylsulfonium hexafluoroantimonate, diarylsulfonium hexafluoroantimonate, triarylsulfonium hexafluoroantimonate, diphenyliodonium hexafluorophosphate, lithiumphenyl-2,4,6-trimethylbenzoylphosphate, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2,4-diethyl-9H-thioxanthene-9-one, 2-hydroxy-4'-(2-hydroxyethoxy-2-methylpropionphenone, camphoquinone, 1-hydroxycyclohexyl phenyl ketone, methyl benzoyl formate, 1,1'-azobis(cyclohexanecarbonitrile), butyl hydrophenoxide, 4,4'-bis(diethylamino)benzophenone, and 2-ethylhexyl A method for manufacturing a sandwich composite comprising one or more selected from the group consisting of 4-(dimethylamino)benzoate, dimethoxyphenylacetophenone, butylphenoxyethylhexyl carbonate, azobismethylpropionamidine dihydrochloride, and benzoyl peroxide.
  7. In paragraph 1, A method for manufacturing a sandwich composite material in which the above photoinitiator is included in an amount of 2.5 weight% or more and 3.5 weight% or less with respect to the total content of the adhesive.
  8. In paragraph 1, A method for manufacturing a sandwich composite material in which the crosslinking agent comprises one or more selected from the group consisting of trimethylpropane trimethacrylate, trimailopropane triacrylate, triaryl isocyanate, and triisocyanate.
  9. In paragraph 1, A method for manufacturing a sandwich composite material in which the above-mentioned crosslinking agent is included in an amount of 0.5% by weight or more and 3.5% by weight or less with respect to the total content of the adhesive.
  10. In paragraph 1, A method for manufacturing a sandwich composite material in which the above radiation is irradiated at an irradiation dose of 150 kGy or more and 300 kGy or less.
  11. It includes a core layer, a skin layer, and an adhesive layer laminated between the core layer and the skin layer, The flexural strength measured by the ASTM D790 method is 34 MPa or more and 42 MPa or less, and A sandwich composite material having a glass transition temperature of the adhesive layer of the above-mentioned adhesive layer of 77 ℃ or higher and 85 ℃ or lower.

Description

Method for manufacturing a sandwich composite and sandwich composite The present invention relates to a method for manufacturing a sandwich composite and a sandwich composite. Structural sandwith composites consist of a skin layer with fiber-reinforced composite materials, such as carbon fiber or glass fiber, applied to the surface, and a low-density core, such as a honeycomb core or balsa wood, in the middle. Because they offer superior specific stiffness and specific strength compared to conventional metal materials, they are structures that enable lightweight design. To apply sandwich composites to structures, joining between the composites is essential. While mechanical joining using bolts and joining using adhesives are commonly used, joining using bolts has the disadvantage of increasing the weight of the composites, so joining using adhesives is the most widely utilized method. In particular, among bonding methods using adhesives, the autoclave process is primarily used to improve adhesive performance; however, this results in a long curing time, which limits production speed, and the very high energy required for curing acts as a major factor in increasing costs. As a solution to these problems, there is a need for the development of technology for bonding skin and core layers using radiation curing, which can significantly reduce production time and consequently lower process costs by completing the curing reaction within a very short time at room temperature. Figure 1 shows a graph representing the measured flexural strength of a sandwich composite according to the photoinitiator content. Figure 2 shows a graph representing the measured flexural strength of a sandwich composite according to the radiation dose. Figure 3 shows a graph representing the measured flexural strength of a sandwich composite according to the crosslinking agent content. Hereinafter, the present invention will be described in more detail to aid in understanding the invention. Terms and words used in this specification and claims shall not be interpreted as being limited to their ordinary or dictionary meanings, but shall be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Method for manufacturing sandwich composites The present invention provides a method for manufacturing a sandwich composite material comprising the steps of: preparing a core layer and a skin layer; applying an adhesive capable of curing by radiation to at least one surface of the core layer or one surface of the skin layer; and bonding the skin layer to one or more surfaces of the core layer and irradiating the bonding interface with radiation, wherein the radiation is irradiated at an irradiation dose of 50 kGy or more and 500 kGy or less, and the adhesive contains a photoinitiator in an amount of 2.5 wt% or more and 5.0 wt% or less. Hereinafter, the method for manufacturing the sandwich composite of the present invention will be described step by step. Preparing the core layer and skin layerstep This step involves preparing the core layer and skin layer that serve as the materials for the sandwich composite. The sandwich composite is generally a multilayer composite material consisting of a core layer located in the center and skin layers positioned at the top and bottom. According to one embodiment of the present invention, the core layer is a central material located between the skin layers, and serves to maintain the thickness of the sandwich composite to increase overall stiffness, increase resistance to bending loads, and control the weight of the composite. According to one embodiment of the present invention, the core layer may be a material that is lightweight yet provides high shear strength, and for example, the core layer may be one or more selected from the group consisting of cork, polyurethane, polyvinyl chloride, polypropylene, polystyrene, aluminum, titanium, stainless steel, and cellulose. According to one embodiment of the present invention, the thickness of the core layer may be 1 mm or more and 5 mm or less, more specifically, 1.0 mm or more, 1.5 mm or more, 2.0 mm or more, 2.5 mm or more, or 3.0 mm or more, and may also be 5.0 mm or less, 4.5 mm or less, 4.0 mm or less, or 3.5 mm or less. The thickness of the core layer may affect the bending stiffness and shear strength of the sandwich composite, and when the thickness of the core layer satisfies the above range, the sandwich composite can secure high bending stiffness and high shear strength. According to one embodiment of the present invention, the skin layer is located on the outside of the sandwich composite and serves to disperse external loads and impacts and provide structural stability to the entire composite. According to one embodiment of the present invention, the skin layer may be one or more selected from t