32results about How to "Excellent sound absorption and noise reduction performance" patented technology

The invention provides a sound-absorbing composite and a preparation method of the sound-absorbing composite. The method comprises the steps of placing a double-faced adhesive tape between a polyurethane sponge and a melamine sponge, conducting hot pressing composition, obtaining a semifinished sound-absorbing composite, coating an adhesive on the melamine sponge of the semifinished sound-absorbing composite, and obtaining the sound-absorbing composite after an adhesive layer is formed, wherein the thickness ratio of the melamine sponge to the polyurethane sponge is 1:1.5-1:5. The sound-absorbing composite is prepared by hot pressing composition with the polyurethane sponge and the melamine sponge, so that the sound-absorbing composite has a smaller density and an excellent sound absorption reduction performance, and the effective noise reduction treatment can be conducted relative to the noise spectrum characteristic by adjusting the thickness ratio of the melamine sponge to the polyurethane sponge. In addition, the sound-absorbing composite is small in heat conductivity and has an excellent thermal insulation property, and the effective utilization ratio of energy sources can be increased when the sound-absorbing composite is used for vehicle-mounted air conditioners and air duct systems.

A low-density high-noise-reducing polypropylene nano-composite material and a preparation method thereof are disclosed. The low-density high-noise-reducing polypropylene nano-composite material comprises the following raw materials in percentage by weight: 86-94% of polypropylene, 3-9% of nano-filler, 1-3% of dispersant, 0.1-1% of antioxidant and 0.1-2% of other additives, wherein the nano-filleris a mixture of organic modified montmorillonite and carbon nanotubes, and the weight ratio of the nano-filler to the carbon nanotubes is 2:1. The preparation method comprises the follow steps: weighing raw materials according to a weight ratio, uniformly mixing polypropylene, the dispersant, the antioxidant and other additives in a high-speed mixer, adding the mixture into a twin-screw extruder,adding nano-fillers in the second half of the extruder through side feeding, and granulating by melting extrusion and cooling. As that organic modified montmorillonite and the carbon nanotube are added, the polypropylene composite material has excellent noise reduction performance and low density at the same time, and can be widely applied in the field of automobile interior and exterior ornamentsand the like, thereby meeting the application requirements of automobile lightweight.

The invention provides a preparation method of ceramic fibers. A formula of the ceramic fibers comprises the following components in parts by weight: 45 to 55 parts of silicon dioxide, 40 to 50 partsof aluminum oxide, 0.8 to 1 part of iron oxide, 0.1 to 0.25 part of sodium oxide and 0.1 to 0.25 part of potassium oxide; the preparation method comprises the following steps: a, weighing the materials and putting the materials into a melting furnace with the temperature of 2000 to 2500 DEG C and melting; b, carrying out thread throwing and fiber forming on the molten mixture through a thread throwing machine, wherein a thread throwing speed is 8000 to 10000r/min; c, conveying obtained fibers into a bulk material; forming a layer spreading structure through a conveyor belt; d, carrying out double-faced needling on bulk cotton with the layer spreading structure, so as to form original ceramic fibers with a certain tensile force; e, determining the nature of the original ceramic fibers through a high-temperature box with the height of more than ten meters; f, cutting and packaging the ceramic fibers with the determined nature. The preparation method of the ceramic fibers has the advantages that the prepared ceramic fibers have light weight and the whole quality of an industrial kiln furnace can be effectively reduced; the chemical stability is good and the chemical corrosion resisting capability is relatively strong.

The invention relates to a preparation method of a composite foamed building wall thermal-insulation material. The invention aims to provide a thermal-insulation material which has the advantages of excellent thermal-insulation property, favorable heat-insulating property (low heat conductivity coefficient) and favorable noise absorption and reduction properties. The method provided by the invention has the advantages of simple technical process and low manufacturing cost. The technical scheme is as follows: the manufacturing method comprises the following steps: 1) preparing hydrophobic expanded perlite; 2) preparing a wood liquefied expandable resin; and 3) preparing the composite foamed building wall thermal-insulation material.

The invention relates to a sound absorption structure of a volute and volute air inlet of a noise reduction centrifugal fan. According to the sound absorption structure, a sound absorption plate is fixed to a volute side plate through a mounting plate, and a silencing cavity is formed between the sound absorption plate and the volute side plate; a plurality of web sound absorption plates are uniformly arranged on a volute web in the transverse and longitudinal directions; and a plurality of arc-shaped flow guide blocks which are obliquely arranged are arranged on the arc-shaped side wall of avolute air inlet. Compared with the prior art, the sound absorption structure has the following beneficial effects that the design of a spatial sound absorption structure is adopted, so that the effective sound absorption area is greatly increased, and the noise reduction effect is good; the structure is safe and reliable, and repeated maintenance and replacement are not needed in the service cycle; a sound absorption material has small influence on the performance of the fan, and the influence on the fan efficiency is less than 1%; and the sound absorption structure can be widely applied to ventilation and air supply industries with higher requirements on environmental comfort (low noise).

The invention specifically relates to a heat-insulating carbon fiber soft felt and a preparation method thereof, belonging to the field of novel materials. The heat-insulating carbon fiber soft felt comprises a surface layer and a composite web layer, wherein a ratio of the thickness of the surface layer to the thickness of the composite web layer is 1: (1.8-3), and the composite web layer is prepared from 15 to 25 parts by weight of polyester fibers and 30 to 45 parts by weight of carbon fibers.

The invention provides a nanometer flame-retardant soundproof adiabatic material used for aerospace. The nanometer flame-retardant soundproof adiabatic material used for aerospace comprises a surfacelayer, a middle layer and a bottom layer, wherein the middle layer is porous material fibers, the surface layer is a mirror aluminium foil covered with nanometer SiO2, and the bottom layer is an aluminium-plastic compound material. The middle of the adiabatic material is of a porous material fiber structure, and glass fibers used for aerospace and astronavigation are adopted, so that gas convection is effectively reduced, and the nanometer flame-retardant soundproof adiabatic material used for aerospace has excellent thermal-insulation performance and sound-absorption noise-reduction performance; the bottom layer is the aluminium-plastic compound material, is formed by compounding multiple layers of films, and has an excellent thermal-insulation effect; and the surface layer is the mirroraluminium foil covered with the nanometer SiO2, so that the anti-oxidation capability and the corrosion-resistant capability of the aluminium foil are improved, the reflectivity of the aluminium foilis not affected, and the fact that the material is used in a severe environment for a long term, and is not oxidized or corroded can be guaranteed.

The invention provides a thermal insulation sound-absorption and noise-reduction TPU (Thermoplastic polyurethanes) thin film and a preparation method thereof. The TPU thin film is prepared from the following raw materials in parts by weight: 60 to 70 parts of TPU particles, 15 to 20 parts of polycarbodiimide, 10 to 30 parts of epoxy resin, 10 to 15 parts of perlite, 10 to 20 parts of ceramic particles and 5 to 10 parts of antioxidant. The prepared TPU thin film is good in thermal insulation performance, sound-absorption and noise-reduction performance and mechanical performance and wide in application prospect.

The invention provides a sound insulation construction steel plate, belongs to the technical field of construction or decoration materials, and solves the problems of poor sound insulation effect and the like of stainless steel sheet plates in the prior art. The sound insulation construction stainless steel plate comprises a substrate made of a stainless steel material, one side of the substrate is sequentially provided with a sound insulation layer and a resin coating layer, the other side of the substrate is provided with a polyester fiber sound-absorbing decorative board. The sound insulation construction stainless steel plate can not only regulate the indoor sound mixing effect to obtain clear and full audio experience, but also has good sound absorption and noise reduction performances, and can effectively prevent the spread of sound, and on the other hand, the resin coating layer and the polyester fiber sound-absorbing decorative board can make the stainless steel plate color rich and diverse.

The invention discloses a high-heat-insulation ultralow-heat-conductivity-coefficient composite heat preservation material with a fireproof function, and relates to the technical field of heat insulation composite heat preservation materials. The high-heat-insulation ultralow-heat-conductivity-coefficient composite heat preservation material comprises an aluminum silicate fiber base layer and a waterproof coating, a blocking layer is arranged on one side of the aluminum silicate fiber base layer, a heat insulation layer is arranged on the other side of the blocking layer, the waterproof coating is arranged on the other side of the heat insulation layer, and a fireproof layer is arranged on the other side of the waterproof coating. The high-heat-insulation ultralow-heat-conductivity-coefficient composite heat preservation material with the fireproof function has excellent chemical stability, heat stability, tensile strength, low heat capacity and low heat conductivity, and the situation that the overall heat insulation and fireproof effect is affected due to breakage and pull-apart of the composite heat preservation material caused by pulling of external force in the actual use process is avoided; and meanwhile, due to the excellent sound absorption and noise reduction performance, the actual use range of the composite thermal insulation material is greatly widened, and the composite thermal insulation material has the fireproof performance and the good waterproof performance.