49results about How to "High sound absorption coefficient" patented technology

A process for preparing the nano-class glass fibres includes such steps as proportionally mixing SiO2, CaO, Na2O, K2O, Li2O and TiO2, smelting, drawing wire, burning-blowning, and collecting. Its apparatus is composed of smelting furnace, drawing unit, burning-blowing unit and collector.

The invention relates to a dense-graded asphalt concrete with continuous skid-resistant and noise-reduction functions. The dense-graded asphalt concrete is prepared from a coarse aggregate, a fine aggregate, packing and asphalt according to the matching requirements of dense-graded asphalt concrete. The dense-graded asphalt concrete is characterized in that the coarse aggregate comprises the following components in percentage by weight: 0-50% of common coarse aggregate and 50-100% of functional aggregate, wherein the functional aggregate is of a core-shell structure and composed of a porous core matrix and an alkaline surface activated shell layer, the porous core matrix takes mullite as a main ore phase and formed into a continuous phase, air holes are distributed in the continuous phase, the diameters of the air holes are distributed in a multistage mode, and the small holes mainly include micron small holes; and the ore phase of the alkaline surface activated shell layer mainly comprises dicalcium silicate, tricalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. The dense-graded asphalt concrete disclosed by the invention is good in bearing capacity, excellent in water damage resistance and continuous skid-resistant and noise-reduction functions and good in durability, and has a broad application prospect.

The invention discloses a basalt fiber prepreg comprising basalt fiber, epoxy resin and release paper, wherein the epoxy resin is soaked into a basalt fiber layer; and the release paper is directly attached to the outer surface of the basalt fiber layer. In addition, the invention discloses a two-step hot melting preparation method of the basalt fiber prepreg, and the preparation method comprises the steps of film preparation and presoaking. The method disclosed by the invention is simple, and the prepared basalt fiber prepreg is favorably applied to the market field of composite materials such as plates, fishing poles and profiled bars. The basalt fiber and a product thereof have abnormally excellent performances on the following aspects of remarkable high temperature resistance and thermal shock resistance, relatively low heat conduction coefficient, high elasticity modulus and tensile strength, good chemical stability, relatively high sound absorption coefficient, favorable electric insulation and dielectric properties, relatively low moisture absorptivity and natural silicate intermiscibility.

A meltblown nonwoven fabric is provided having thermoplastic resin fibers having an average fiber diameter of 0.1 to 10 μm, a bulk density of not more than 36 kg/m³ and an air permeability, as measured by a Frazier type method at basis weight of 200 g/m², of 3 to 100 cc/cm²/sec. The meltblown nonwoven fabric has a low bulk density and is excellent in sound absorption performance, oil adsorption performance, heat insulation performance, dust collection performance and filtration performance. Since the meltblown nonwoven fabric can be formed from one kind of a resin composition, it can be simply and easily produced as compared with the case of using mixed fibers or conjugated fibers formed from many kinds of resins, and the resulting meltblown nonwoven fabric can have uniformity and no variability of properties.

The invention relates to a sound absorbing material and a preparation method thereof. The sound absorbing material is prepared by the following steps of using wide-source water-quenching copper slag and processing plant wastewater containing collagen as main raw materials; mixing, foaming, injecting into a die, drying, and curing, so as to obtain the sound absorbing material. The prepared sound absorbing material has the advantages that the wet unit weight is low, the weight is light, the compressive strength and bending strength are high, the sound absorbing coefficient is high, the manufacturing cost is low, and the processing is simple; compared with common fiber sound absorbing material, the characteristics of water proofing, flame retardancy and corrosion resistance are realized; the durability is strong, the sound absorbing material is very suitable for governing various noises, such as industrial plants, KTV (Karaoke), subways, highways, railways and airports, and the application prospect is wide.

The invention discloses a sound-absorbing polyurethane rigid foam composite material for vehicles, which is composed of a component A and a component B. The component A comprises the following raw materials in parts by weight: 40-60 parts of polyether polyol A; 15 to 25 parts of polyester polyol; 10 to 20 parts of polyether polyol B; 2-7 parts of a chain extender; 0.8 to 3.0 parts of a surfactant;0.5 to 1.5 parts of a catalyst; and 2.0 to 4.0 parts of water; the component B is prepared from polymethylene polyphenyl polyisocyanate as a raw material; wherein the polyether polyol A is polypropylene oxide-polyoxyethylene polyol with the functionality of 3 and the molecular weight of 3,000 to 9,000; wherein the polyester polyol is phthalic anhydride polyester polyol with the functionality of 2-3 and the molecular weight of 300-2000; and the polyether polyol B is polypropylene oxide polyol with the functionality of 3-4 and the molecular weight of 300-1000.

The invention discloses a production process of an intelligent odorless automotive interior nanomaterial and belongs to the technical field of novel material processing. The process comprises materialpreparation, blending, coarse opening, fine opening, large-bin cotton blending, quantitative cotton feeding, carding, netting, pre-needling, primary needing, trimming and winding, unwinding of bottom-layer needled felt, roll type powder scattering, electronic alignment and unwinding of upper-layer needled felt and 2-3 times of needling and composition to obtain composite needled felt, winding, unwinding of the composite needled felt, far infrared preheating, blowing through heating, multi-roll cold rolling, cutting, obtaining of a finished product, inspection and packaging. By means of the process, nano SiO2 powder is composited between two layers of needled felt, the intelligent odorless automotive interior nanomaterial is obtained, the aldehyde release amount reaches the environmental protection standard, the environmental protection grade reaches the grade E0, the flavor is smaller than the grade 1, the sterilization and disinfection capability reaches 95% or above, the sound absorption coefficient is improved by 30%-40%, noise is reduced by 10-15 db and the weight is reduced by 10%-20%.

The invention relates to the technical field of construction materials, and specifically relates to a sound absorbing brick capable of reducing noise pollution. The sound absorbing brick is mainly composed of diatomite, bio-carbon, ceramic sand, talcum powder, silica micro-powder, zirconium boride, a dispersant, an adhesive and water; wherein the particle size of the bio-carbon is 300 to 400 nm, the bio-carbon is prepared from cactus, sisal hemp, maguey leaf, leaf of gasteria duval, corn straw, ramie, flax, kendir, hemp, undaria pinnatifida, and sea tangle, and silica aerogel is loaded on thebio-carbon. Compared with a conventional sound absorbing brick containing mineral wool fibers, the provided sound absorbing brick has a greater sound absorbing coefficient, is capable of obviously reducing the noise pollution, meets the using requirements, has higher mechanical strength, and is more environmentally friendly.

The invention discloses a making method of an automobile sound-absorption carpet. The carpet is formed by pressing a layer A, a layer B, a layer C and a layer D from top to bottom at high temperature. The preparation method includes the steps that a, opening, mixing, carding, cross lapping, needling forming and raising shaping are performed on 100% fine Danny PET fibers to form the layer A having excellent sound-absorption performance; b, opening, mixing, carding, cross lapping and needling forming are performed on three-dimensional crimped fibers and L-PET fibers to form the layer B having a certain thickness and a certain tightness degree; c, a three-roll hot ironing machine is used for pasting the PE face of a PEPA asymmetrical film of the layer D to the layer B, and then cooling is performed to form PET bottom felt finally; d, a PE film is used for pasting the fabric of the layer A to the face, without the PEPA asymmetrical film, of the PET bottom felt formed in the step c, so that the automobile sound-absorption carpet is formed. The automobile sound-absorption carpet has the advantage that the fine Danny fibers are adopted for achieving the sound-absorption effect of the product according to requirements.

The invention relates to a manufacturing method of a saloon car sound insulating pad, particularly relates to a novel manufacturing method of the saloon car sound insulating pad with an environment protection characteristic, and belongs to the manufacturing technology field of auto interior decoration. The manufacturing method comprises the steps: firstly, manufacturing a forming mold; secondly, using a palm fiber and a natural latex to blend so as to obtain a base material of the sound insulating pad; pressing and molding the base material of the sound insulating pad in a thermal forming mold to obtain a semi-finished product of the sound insolating pad; at last, putting a fabric in the mold and pressing and flattening the fabric and the semi-finished product, so as to obtain the environment-friendly saloon car sound insulating pad. According to the manufacturing method, the manufacturing process is simple and is similar to that of reconstituted cotton; only the innovation of the material gives a novel connotation to a traditional saloon car sound insulating pad; the sound absorption coefficient is greatly improved; at the same time, the improvement of the environment protection characteristic satisfies the higher demand of people on the safety performance of a passenger car; and the sound insulating pad is an environment-friendly product and achieves the goal of recycling on a certain technology basis.

The invention discloses three-component sound-absorbing cotton and a preparation method thereof, and belongs to the technical field of sound-absorbing materials. The three-component sound-absorbing cotton comprises three components, wherein an upper surface layer (1), a first adhesive layer (2) a middle layer (3), a second adhesive layer (4) and a lower surface layer (5) are sequentially arrangedin a stacked mode from top to bottom. The middle layer (3) is made of polyurethane porous foam materials, the upper surface layer (1) and the lower surface layer (5) are both made of mixed fibers of polyethylene glycol terephthalate fibers and polypropylene fibers, and the first adhesive layer (2) and the second adhesive layer (4) are both made of adhesives. The invention further discloses the preparation method of the three-component sound-absorbing cotton. The three-component sound-absorbing cotton is of a three-layer structure, has excellent sound-absorbing and sound-insulating effects, andis small in overall surface density.

The invention discloses a melamine sponge, and relates to the technical field of the melamine sponge. The melamine sponge is prepared by the following steps: (1) preparing an ethanol/ammonia water mixed solution; (2) modifying nano zeolite powder; (3) preparing a basic treatment solution; and (4) melamine sponge treatment. According to the melamine sponge, the internal aperture ratio is as high as99%, and the prepared melamine sponge has a relatively high sound absorption coefficient, which indicates that the prepared melamine sponge has an excellent silencing effect so that the melamine sponge can be applied to the field of sound insulation and plays a great role in reducing sound and noise.

The invention provides a eucalyptus veneer veneered wood-based composite board and a preparation method thereof, and belongs to the technical field of composite boards. The eucalyptus veneer veneeredwood-based composite board provided by the invention is characterized by comprising a honeycomb composite layer and eucalyptus veneer layers adhered to two sides of the honeycomb composite layer, wherein the matrix of the honeycomb composite layer is a honeycomb plate core; the pores of the honeycomb plate core are filled with fillers; and the fillers comprise buckwheat hulls, wood fibers and inorganic adhesives. According to the eucalyptus veneer veneered wood-based composite board, a honeycomb core layer of the composite board is filled with the buckwheat hulls, the wood fibers and the inorganic adhesives, so that the compression resistance of the board is improved, and the sound insulation effect of the composite board is further improved.

The invention belongs to the technical field of preparation of agricultural mulch films, in particular to a method for preparing agricultural mulch film for sound-absorbing cotton leftover scraps usedin vehicles. The preparation method comprises the steps: a step of pulverization of sound-absorbing cotton leftover scraps used in vehicles, a melting and granulating treatment step, a mixed treatment step of low-density polyethylene, polypropylene and liquid paraffin and a step of granulating the all materials through a screw extruder and blowing the materials into a mulch film with the thickness of 0.004mm to 0.1mm through a film blowing machine. Accordign to the degradable agriculture mulch film disclosed by the invention, the sound-absorbing cotton leftover scraps used in vehicles are used as one of the raw materials, and materials such as modified tapioca starch, a photosensitizer cerium stearate powder, a hindered phenolic antioxidant and a thermal degradation enhancer are added, sothat the degradable capability of the mulch film is improved, the degradation time of the mulch film is effectively controlled, the degradation effect is achieved, the production cost is reduced, andwhite pollution is reduced.