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

A sound-absorbing material for subway is prepared from haydite (40-70%), cement (20-48%) flyash (0-10%) and foaming agent (1-2%) through diluting foaming agent with water, mixing the others, adding the deluted foaming agent to the mixture and shaping. Its advantages are broad audio band, high sound absorptivity, low volume weight, high strength, resisting fire and water, no toxicity, and low cost.

A control apparatus for reducing noise of an air conditioner indoor cabinet comprises an air outlet arranged on the indoor cabinet and an air-out plate attached to the air outlet. Pressurized air flow passes through the air-out plate and is then delivered out of the indoor cabinet from the air outlet. The air-out plate is provided with micro pores and / or micro slits. The porosity of the micro pores and / or micro slits is 3% to 5%. The micro pores are arranged in a square or a regular triangle shape. The diameter of the micro pores is 1 mm to 2 mm, and / or the width of the micro slits is 1 mm to 2 mm. The micro slits are transversely, longitudinally, obliquely, or crosswise arranged. A cavity is arranged at the back of the air-out plate. The thickness of the cavity is 5 to 20 cm. The outward side of the cavity is provided with a sound absorption layer. The apparatus of the invention has the characteristics of simple and reasonable structure, easy processing, low noise, wide scope of application, high sound absorption coefficient, and wide sound absorption frequency, and can effectively reduce the noise of the air conditioner indoor cabinet.

The invention discloses a production technology of sound absorbing cotton formed by compounding short fiber and melt-blowing. Compared with a traditional technology, two-time opening technology, an airflow wind supplement conveying mechanism, double-roller receiving composite forming technology are mainly added. The production technology of the sound absorbing cotton formed by compounding the short fiber and melt-blowing has the advantages that equipment is advanced, the technology is simple, it is noticed that the temperature is controlled on the original basis, the prepared sound absorbing cotton not only has excellent properties of light weight, sound absorption, good sound insulation performance, good hydrophobicity, good plasticity, flame retardance and the like, but also is odorless,waterproof, dampproof, good in air permeability, anti-staining and antibacterial, and has a wide application prospect and market value.

A laminated structure body with a ridge-groove board (11) with a large number of ridges and grooves and with a closing board (15) joined to the ridge-groove board so as to close one side of the ridge-groove board to form a hollow portion (13). In the laminated structure body are provided a partition board (21) for partitioning the hollow portion (13) into two or more partitioned spaces (22a, 22b) and two or more hole groups (25a, 25b) opened in the ridge-groove board so as to be communicated with each of the partitioned spaces (22a, 22b) partitioned into two or more spaces. Thus a sound-insulating and -absorbing body is formed.

The invention relates to the field of chemical fiber manufacturing, in particular to a glass fiber reinforced polyester composite filament and a preparation method thereof. The composite filament is formed by mixing and compounding glass fiber and polyester. The fineness ratio of the glass fiber to the polyester is 1.8-3. The specific preparation method comprises the following steps: 1) pre-treating the glass fiber, 2) stranding, 3) false twisting, 4) sizing, 5) oiling and 6) winding molding to obtain a finished composite filament product. The glass fiber reinforced polyester composite filament with good performances can be obtained by the method.

The invention discloses a preparation process of a ceramsite asphalt pavement material. The preparation proces comprises the following steps: preparing the following raw materials in parts by weight:30-50 parts of asphalt, 1-2 parts of modified nano filler, 10-13 parts of modified shale ceramsite, 5-10 parts of SBS modifier, 3-5 parts of basalt fiber, 2-4 parts of diatomite, 5-10 parts of rubberpowder, 0.3-0.5 part of dispersing agent, 0.1-0.3 part of cross-linking agent and 0.1-0.3 part of antioxidant; the ceramsite asphalt pavement material is prepared by mixing the modified shale ceramsite, the modified nano-filler, asphalt and other fillers, and the modified nano-filler is added into the ceramsite asphalt pavement material, so that the mechanical property, barrier property and thermal stability of the ceramsite asphalt pavement material are improved, and the ceramsite asphalt pavement material has fatigue resistance, low-temperature crack resistance and water stability by utilizing a special physical structure of the diatomite and high damping and shock absorption characteristics of the basalt fibers.

The present invention discloses a high sound absorption coefficient expanded PTFE composite fiber cotton, comprising a melt-blown high polymer fibrous layer and an expanded PTFE film layers or a modified film layer of expanded PTFE, the modified film layer of expanded PTFE is made by conducting modification treatment to a PTFE film; the high sound absorption efficiency expanded PTFE composite fiber cotton is made by combining the melt-blown high polymer fibrous layer and the expanded PTFE film layer or the modified film layer of expanded PTFE. Thus, the present invention with better full-frequency sound absorption capability and marked full-frequency sound absorption effect can be bound in a large area or filled on automobiles' engine hoods, body racks or the inner side face of automobile trunks to substantially absorb automobile noise; it has advantages such as chemical inertness, waterproof, dustproof, permeable filterability, long service life and weldability.

The invention discloses an intelligent train tunnel noise generating system based on single chip microcomputer control, which comprises a mounting structure and an integrated device (4) connected with the mounting structure, wherein the integrated device (4) comprises a single chip microcomputer processing unit, a noise generating unit, a piezoelectric ceramic generating module connected with the single chip microcomputer processing unit through a data line, a voltage-stabilizing energy storage module and an intelligent control module. Noise generated by the train in the tunnel is used, and through the piezoelectric generating module and the intelligent control module arranged at two sides of the tunnel, electric energy conversion by the tunnel train noise and intelligent lighting control are realized; and the recovery and the utilization of noise energy can be effectively realized, the energy is saved while the purpose of noise reduction is achieved, and the line arrangement in the tunnel is simplified.

The invention discloses a premixed polyether, and a polyurethane foam, a preparation method thereof and an application thereof in a sound insulation door. The premixed polyether comprises polyether polyol A, polyether polyol B, a silicone foam stabilizer, a catalyst, water and triethyl phosphate, and is characterized in that the silicone foam stabilizer is B-8523 silicone foam stabilizer produced by Evonik Degussa Specialty Chemicals (Shanghai) Co., Ltd. The polyurethane foam manufactured from the premixed polyether significantly improves a sound absorption coefficient, prepares the sound insulation door which can achieve good sound insulation effects, and thereby achieves the purpose of reducing noise pollution.

The invention discloses porous weather-resistant abrasion-resistant sound-proof paint for external walls and a manufacturing method of the paint. The porous weather-resistant abrasion-resistant sound-proof paint for the external walls is composed of a three-layer structure, wherein the bottom layer is a ceramic structure which is formed by mixing montmorillonite and kaolin according to a mass ratio of (3-3.5):(8-10), mixing the obtained mixture and grid-like carbonized fibers and performing electric heating pulse and extends into wall body cement; the middle layer is a mullite-like porous ceramic structure obtained by mixing silicon dioxide micropowder, zircon powder, rutile powder, montmorillonite and kaolin according to a mass ratio of (5-6):(0.2-0.3):(0.1-0.2):(21-24.5):(56-70) and performing electric heating pulse treatment; and the surface layer is a silica gel membrane. The paint has the advantages of high water resistance, a high sound absorption coefficient, high weather resistance, self pore forming, environmental protection, no pollution, and good binding force with the walls.

A sound-absorbing material for subway is prepared from haydite (40-70%), cement (20-48%) flyash (0-10%) and foaming agent (1-2%) through diluting foaming agent with water, mixing the others, adding the deluted foaming agent to the mixture and shaping. Its advantages are broad audio band, high sound absorptivity, low volume weight, high strength, resisting fire and water, no toxicity, and low cost.

The invention discloses an aluminum alloy suspended ceiling plate capable of absorbing sound and radiation. The plate includes an aluminum alloy panel and an inner core structure; the inner core structure includes a first sound absorbing structure layer, a second sound absorbing structure layer, a third sound absorbing structure layer, a radiation absorbing structure layer and a bottom supportinglayer which are bonded with one another from outside to inside in sequence. A cavity is formed in the first sound absorbing structure layer and fully filled with a sound absorbing solution, and suspended particles are contained in the sound absorbing solution; the second sound absorbing structure layer is an alveolate layer, the third sound absorbing structure layer is a loose resin layer, and thebottom supporting layer is a stainless steel layer. The aluminum alloy suspended ceiling plate has the advantages that through multiple layers of sound absorbing structures, refraction, diffraction,scattering, reflection and the like of sound are increased, the efficiency of scattering and attenuating the sound is improved, and the sound absorption coefficient of the suspended ceiling plate is increased. Through a radiation absorbing structure layer which consists of multiple layers of metal screens and inserted lead glass, most of radiation can be absorbed, and influences caused by radiation to the human body are reduced. Moreover, the suspended ceiling plate is reasonable in structure, lightweight and convenient to install.

The invention relates to the field of chemical fiber manufacturing, in particular to a glass fiber reinforced polyester composite filament and a preparation method thereof. The composite filament is formed by mixing and compounding glass fiber and polyester. The fineness ratio of the glass fiber to the polyester is 1.8-3. The specific preparation method comprises the following steps: 1) pre-treating the glass fiber, 2) stranding, 3) false twisting, 4) sizing, 5) oiling and 6) winding molding to obtain a finished composite filament product. The glass fiber reinforced polyester composite filament with good performances can be obtained by the method.

The invention discloses a composite sound absorbing material, and a preparation method thereof. The composite sound absorbing material is prepared from, by weight, 88 to 100 parts of modified fly ash, 55 to 65 parts of organic bentonite, 50 to 65 parts of perlite, 55 to 60 parts of barite powder, 35 to 45 parts of aluminium oxide, 30 to 40 parts of antimonous oxide, 20 to 30 parts of stannous chloride, 20 to 30 parts of borax, and 10 to 15 parts of sodium silicate. The composite sound absorbing material is high in sound absorption coefficient, and wide in distribution frequency band; possesses excellent sound absorbing effect at low frequency (lower than 500Hz), medium frequency (500 to 2000Hz), and high frequency (higher than 2000Hz) zones, and wide application range; and also possesses excellent porosity, compressive yield strength, processing performance, and mechanical properties.

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 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.