30results about How to "Sound absorption and noise reduction effect is good" patented technology

The invention relates to the technical field of rock plate back coating material processing, and particularly discloses a two-component back coating material for a rock plate and a preparation method thereof, and the two-component back coating material is prepared from a powder mixture and a liquid mixture; the powder mixture is mainly prepared from the following raw materials: quartz sand, ordinary Portland cement, cement-based capillary crystalline master batch, hydroxyethyl cellulose, dispersible latex powder, diatomite, bamboo charcoal powder and aluminum oxide; the liquid mixture is mainly prepared from the following raw materials: a water-based polymer emulsion, 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, sodium citrate, a penetrating agent, a wetting agent and a silane coupling agent. According to the two-component back coating material, the synergistic effect of the raw materials is utilized, so that the two-component back coating material has relatively high bonding strength, thermal aging resistance and freeze-thaw resistance, shows good bonding stability and sound absorption and noise reduction effects, meets the market requirements and expands the application range.

The invention discloses a double-faced sound absorption and noise reduction device of a railway track, and an installation method thereof. The railway track comprises a plurality of sleepers (1) and steel rails (2) erected on the plurality of sleepers (1), the sound absorption and noise reduction device is installed on the steel rail (2) on a suspended segment between adjacent sleepers (1), the sound absorption and noise reduction device comprises two double-faced sound absorption boards (3), the two double-faced sound absorption boards (3) are respectively adhered on two sides of the steel rail (2) on the suspended segment through adhesion layers (4), each double-faced sound absorption board (3) comprises an upper sound absorption panel (31) and a lower sound absorption panel (32), the upper sound absorption panel (31) is arranged toward the upper side of the railway track, and the lower sound absorption panel (32) is arranged toward the bottom of the railway track. The sound absorption and noise reduction device has the advantages of easy implementation, low cost and good sound absorption and good noise reduction effect.

The invention provides a preparation method for an engine cover lid. The method comprises the following steps: after a skin layer generating agent is subjected to reaction and injection moulding, a skin layer with a wavy structure is obtained; a micro perforated plate is placed on the wavy surface of the skin layer, a foam layer generating agent is poured on the micro perforated plate, and mold closing is carried out; and after molding is performed, mold opening is carried out, and therefore the engine cover lid is obtained. The engine cover lid provided by the invention includes a foam layerand the skin layer covering the foam layer, wherein the foam layer is rich in foam and the micro perforated plate, so that noise generated by an engine can be better absorbed; the wavy surface of theskin layer can reflect the noise from the engine back to the foam layer, thereby prolonging the standing time of the noise in the foam layer, giving play to better sound-absorbing and noise-reducing effects, and facilitating acquirement of better mute of a cab; and at the same time, the non-wavy surface of the skin layer has a good appearance, so that the visual requirements of users can be met.

The invention provides a nonwoven fabric wheel casing which at least comprises a thermoplastic plastic frame and a nonwoven fabric located in the thermoplastic plastic frame.The thermoplastic plastic frame keeps the overall shape of the nonwoven fabric wheel casing and is connected with a bumper bar and an automobile body.The thermoplastic plastic frame is prepared from, by weight, 100 parts of thermoplastic polyolefin, 0.05-15 parts of inorganic filler, 0.01-5 parts of glass fiber, and 0.01-5 parts of halloysite nanotubes.The nonwoven fabric is prepared from, by weight, 100 parts of polyester fiber and 20-45 parts of polypropylene fiber.The nonwoven fabric is stable in performance, good in sound insulation effect, capable of being used in common conditions and capable of better meeting special requirement of rain, snow and other severe weather and complex road conditions for the wheel casing.

The invention discloses a soundproof composite door. The soundproof composite door comprises a door panel and a door frame, the door panel comprises an inner soundproof board, an outer soundproof board disposed under the inner soundproof board and a frame which is connected with the inner soundproof board and the outer soundproof board through mortise and tenon and used for fixing the door panel.A first composite fiber board which is attached to the inner soundproof board and used for increasing the strength of the door panel is arranged on the lower surface of the inner soundproof board, anda second composite fiber board which is attached to the outer soundproof board and used for increasing the strength of the door panel is arranged on the upper surface of the outer soundproof board. Asound absorbing sponge layer is arranged between the first composite fiber board and the second composite fiber board. The soundproof composite door has the advantages of high hardness and good soundabsorption and noise reduction effects, is durable and safe and environmentally friendly, and is suitable for a variety of occasions.

The invention discloses a permeable asphalt admixture, permeable asphalt and a permeable asphalt pavement. The preparation raw materials of the permeable asphalt admixture comprise the following components in parts by weight: 0.5 to 1.5 parts of an emulsifying agent, 1 part of a dispersing agent, 2 to 4 parts of a capillary pore forming agent and 0.01 to 0.06 part of a catalyst. The permeable asphalt is prepared by uniformly mixing the permeable asphalt admixture and asphalt. The permeable asphalt pavement contains the permeable asphalt admixture. According to the permeable asphalt admixture,the permeable asphalt and the permeable asphalt pavement, the problems of early loosening, easiness in gap blockage in use, low strength, great construction difficulty and high cost in the existing permeable asphalt pavement are solved, and the permeable asphalt pavement has the advantages that the construction performance is excellent, the cost is low, the constructed permeable asphalt pavement is compact in structure and high in strength, gaps are not easily blocked in use, the continuous permeability is high, and the anti-fouling and anti-blockage performance is high.

The invention provides an environmentally-friendly energy-saving stone saw blade and a machining process thereof, and relates to the field of cutting tools. In order to overcome defects in the prior art, the environmentally-friendly energy-saving stone saw blade which has the advantages that the noise is reduced through noise suppression, the deadweight is light, the energy is saved through weight reduction, the efficiency is high, the environmentally-friendly property is achieved, the structure is simple, and the operation is simple and convenient as well as the machining process of the environmentally-friendly energy-saving stone saw blade are provided. The environmentally-friendly energy-saving stone saw blade comprises a saw blade body and saw teeth which are annularly distributed on the edge of the saw blade body, wherein the saw blade body comprises a metal part and a composite part; the composite part sleeves the metal part, and comprises a carbon fiber, a glass fiber, and two or three mixtures of the carbon fiber and the glass fiber; the carbon fiber, the glass fiber, and two or three mixtures of the carbon fiber and the glass fiber are laid in a layer manner, thereby forming a carbon fiber layer, a glass fiber layer and a mixed layer; and the space between every two adjacent layers is coated with epoxy resin glue, thereby forming a bonding layer. The machining process comprises the following steps: preparing materials; laying the composite materials of the composite part; and compacting the composite part.