Disclosed are an embedded co-cured composite material with large-damping and electromagnetic wave absorbing properties and a preparation method and an application thereof, belonging to damping composite materials. The embedded co-cured composite material is formed by interlacing a plurality of electromagnetic wave absorbing prepreg layers and a plurality of electromagnetic wave absorbing damping layers. Each of the electromagnetic wave absorbing prepregs layers includes a fiber cloth, a micro-nano electromagnetic wave absorbing material and a resin. Contents of the micro-nano electromagnetic wave absorbing material in the electromagnetic wave absorbing prepreg layers and the electromagnetic wave absorbing damping layers have a gradient increase or decrease according to a sequence of the electromagnetic wave absorbing prepreg layers. Each of the electromagnetic wave absorbing damping layers includes a viscoelastic damping material and the micro-nano electromagnetic wave absorbing material.

A resin composition including a polyester polyurethane resin (A); and an epoxy resin (B), in which a molecular weight per a urethane bond of the polyester polyurethane resin (A) is from 200 to 8,000, and a layered body including a resin composition layer, a layered body, a flexible copper-clad laminate, a flexible flat cable, or an electromagnetic wave shielding film, each using the resin composition.

The present invention aims to provide a multi-layer sheet with excellent electromagnetic wave shielding properties. The multi-layer sheet includes an alternating multilayer unit with five or more A layer and B layer alternately laminated, in which the electromagnetic return loss at the peak top in the peak of return loss spectrum with the highest return loss at the peak top is 5 dB or more in a chart of the return loss in the multi-layer sheet.

An electromagnetic wave shielding sheet according to the disclosure is configured by a protection layer, a metal layer, and a conductive adhesive layer. The metal layer has a plurality of openings, and an aperture ratio of the opening is 0.1%-20%. In addition, a tensile breaking strength of the electromagnetic wave shielding sheet is 10 N/20 mm-80 N/20 mm.

The present application relates to the technical field of composite film, and more particularly, to a diaphragm composite material and a preparation method thereof. The diaphragm composite material includes a polyethylene naphthalate (PEN) film layer, an aluminum-plated film layer, an aerogel layer, and an elastic adhesive layer disposed between the PEN film layer and the aluminum-plated film layer for bonding the PEN film layer and the aluminum-plated film layer, the aerogel layer is coated on one side of the aluminum-plated film layer away from the elastic adhesive layer. The diaphragm composite layer of the present application has high strength and strong rigidity, has better vibration dampening and noise-reducing effects, and wear-resistant and corrosion-resistant effects, and is worthy of popularization.

A solar radiation shielding fine particle dispersion body containing a thermoplastic resin, solar radiation shielding fine particles, a solar radiation shielding fine particle-containing masterbatch, a solar radiation shielding resin formed body formed into a predetermined shape using the same, and a solar radiation shielding resin laminate including the solar radiation shielding resin formed body stacked on another transparent formed body. A liquid solar radiation shielding fine particle dispersion body, including a mixture of solar radiation shielding fine particles and at least one selected from an organic solvent and a plasticizer dispersed therein or a solar radiation shielding fine particles including a powder solar radiation shielding fine particles dispersion body, obtained by removing a liquid component from the solar radiation fine particle dispersion body upon heating, dispersed in a resin component, wherein the solar radiation shielding fine particles are solar radiation shielding fine particles containing calcium lanthanum boride fine particles.

Provided is a light weight and remarkably flexible sheet-shaped radio wave absorber having excellent radio wave absorbing capacity in milliwave band frequencies. The invention is a milliwave band radio wave absorption sheet comprising a radio wave reflection layer (A), a radio wave absorption layer (B) disposed above the layer (A) so as to be parallel thereto, and a protective layer (C) disposed above the layer (B) so as to be parallel thereto. The layer (B) has, at a frequency of 79 GHz, a dielectric constant, wherein the real part is 10 to 20 and the absolute value of the imaginary part is 4 to 10. The layer (B) has a film thickness of 200 to 400 μm. The absolute value of the imaginary part/real part from the dielectric constant is within a range of 0.30 to 0.60. The layer (C) has, at a frequency of 79 GHz, a dielectric constant, wherein the real part is 1.5 to 8.0 and the absolute value of the imaginary part is less than 1.0, and has a film thickness of 50 to 200 μm. In the milliwave band radio wave absorption sheet, the optical reflectance at an incident angle of 60° is 50% or greater, and the optical reflectance at an incident angle of 20° is 25% or greater. In addition, the invention provides a milliwave band radio wave absorption method using the radio wave absorption sheet, and a radio wave damage prevention method involving the installation of the radio wave absorption sheet.

The invention relates to a cover structure the SMC main body of which is simultaneously pressed and bonded with two additional layers in a bonding press.

An engineered wood product with at least one engineered-wood substrate or core layer (such as, but not limited to, OSB), with a connectivity layer configured to reflect RF signals (e.g., wifi and/or cellular signals), thereby enhancing connectivity in adjacent or proximate spaces or areas. The connectivity layer may be a metallic material, such as, but not limited to, aluminum or copper. The layer may be a sheet or film or foil of the metallic material applied to the surface(s), or integrated into the interior, of the substrate or core layer. The layer also may be a coating or deposited layer. A connectivity layer may be “sandwiched” between two or more engineered-wood substrates, thereby forming a composite panel or product. The surface of the connectivity layer may be embossed or patterned.

A noise suppression sheet comprises a pair of metal magnetic layers and a non-magnetic metal layer interposed between the pair of metal magnetic layers, and can achieve high magnetic shield characteristics on both surfaces.