Balsawood cores for composite material sandwich panels and method of their manufacture
A composite material and sandwich panel technology, applied in building materials, chemical instruments and methods, synthetic resin layered products, etc., can solve problems such as high comprehensive mechanical properties, low manufacturing process efficiency, and reduced resin layer peeling strength.
Active Publication Date: 2016-02-24
GURIT (UK) LTD
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- Description
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- Application Information
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Problems solved by technology
However, this type of layer has been found to significantly reduce the peel strength of the resin layer on the surface of the balsa wood core
The overall result is that this known coating does not provide the high overall mechanical properties including high peel strength and low resin uptake required for balsa cores used in sandwich panels
[0010] Furthermore, when a polymeric resin coating is applied to balsa wood, the curing and / or drying time of the coating can be quite long, for example so long that the solvent evaporates completely from the coating, making the manufacturing process inefficient
Method used
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Examples
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Embodiment 1
[0074] In Example 1, the curable resin composition is used for an average density of about 155 kg / m 3 Balsa wood sheets are coated with a curable resin composition comprising a bifunctional methacrylate resin blended with a difunctional methacrylate diluent and containing urethane acrylate as an Toughness agent (flexibiliser). The composition includes a UV photoinitiator. Amine functional monomers are also included to improve surface cure and prevent sticking. The viscosity of the curable resin composition is about 20 poise at 20°C, about 10 poise at 30°C, and about 6 poise at 40°C.
[0075] The curable resin composition is applied to each major surface of a balsa wood sheet. Coating weight of 107g / m2 per surface 2 . This provides 214g / m per board 2 The coating weight of the board. After 15 seconds of application, curing takes place by UV radiation.
[0076] The resulting coated balsa core was tested to determine the resin uptake of the coated balsa core. Resin uptake...
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Abstract
A method of manufacturing a core for a composite material sandwich panel, the method comprising the steps of: providing a sheet of balsawood with opposite major surfaces, with vessels and axial parenchyma cells of the balsawood extending between the opposite major surfaces in a thickness direction of the sheet; coating a layer of a curable resin composition onto respective opposite major surfaces of the sheet of balsawood; and curing the curable resin composition, wherein the resin composition is applied and cured so that the coating layer of cured resin composition unevenly fills or only partly fills outermost ends of at least some of the vessels in the balsawood and thereby provides, at least in the vicinity of at least some of the vessels, a non-planar outer surface of the coating layer of the cured resin composition over the opposite major surfaces.
Description
technical field [0001] The invention relates to a method of manufacturing a balsawood core material for a composite sandwich panel, in particular a balsawood core material for a sandwich panel comprising an outer layer of fiber reinforced matrix resin composite material. The invention also relates to a balsa core material for a sandwich panel comprising an outer layer of fiber-reinforced matrix resin composite material. Background technique [0002] It is known in the field of structural composites to use balsa wood as the core material for sandwich panels comprising outer layers of fiber-reinforced matrix resin composites. Sandwich panels are generally produced by placing fiber layers on opposing surfaces of balsa wood, respectively, followed by impregnating curable resin into the fiber layers and facing away from the opposing surfaces during a vacuum-assisted resin transfer molding step. Subsequently, the resin is cured to form a sandwich panel. [0003] It is desirable ...
Claims
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IPC IPC(8): E04C2/24B29C70/08
CPCB29C70/088B29K2311/14E04C2/24Y02E10/72B32B27/16B05D1/28B05D3/0254B05D3/067B05D3/068B05D7/08F03D1/0675
Inventor 保罗·斯潘塞玛吉·芒吉安
Owner GURIT (UK) LTD