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Design and Performance of the New Composite Board for Sound Insulation Based on Waste Recycling

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Tutor: LiMingJun
School: Nanchang University of Aeronautics and
Course: Environmental Engineering
Keywords: Sound insulation,Light wallboard,Multilayer composite material,Waste,Recycling o
CLC: TU552
Type: Master's thesis
Year:  2013
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The development and application of sound insulation board can effectivelyreduce the noise interference with people¡¯s living environment and the damage to thebody. The traditional wall of sound insulation depends mainly on the density andthickness of the wall materials to control noise, not only the form of noise reduction issingle, but also the structure is heavy, thick and take up the volume, therefore,providing a new high sound insulation composite wallboard with excellent soundinsulation performance and thin-light construction for housing construction, andeffectively improve the volumetric rate and reduce the building load-bearing will beone of key research directions in the field of noise reduction in the future, the sametime, waste of resources for the preparation of the composite board, improve the addvalue of crumb rubber and scrap steel slag powder by waste recycling has significantacademic and application value.A variety of noise reduction mechanisms were introduced in this paper, includingsound absorption, sound insulation and damping noise reduction. First, prepared thepolyurethane foam which was filling modified by waste slag, and optimized the bestacoustic performance parameters, then, composited with different panel materials andthe modified WRP damping material, it is a new lightweight composite soundinsulation wall board with its excellent performance, light, economical, easy toprocessing and molding. Researched through the use of The impedance tube materialsuction sound insulation measurement system, scanning electron microscopy(SEM),dynamic mechanical analysis (DMA) and the pendulum test equipment to characterizethe acoustic performance of materials, microscopic cross section structure, dynamicmechanical properties, impact resistance. The main conclusions are as follows:(1) Obtained a new type of thin high sound insulation5layer compositewallboard structure by experimental optimization, the structure, process parametersand noise performance are: panel material and thickness for type1050aluminum,1.21mm thick; acoustic absorption and sound insulation core board for adding slagpowder modified polyurethane foam plastic, scrap steel slag powder mass ratio forWssp: Wpu=3:10, the particle size of120mesh, foam temperature of65¡æ, theporosity of82.87%a thickness of2cm; damping layer having a thickness of1mm,tan¦Ämax=0.784; the layers of the composite wall are arranged sequentially for thepanel/damping layer/suction sound insulation core layer/damping layer/panel, the total thickness of2.422cm£¨only1/10of the thickness of concrete brick wall£©, thetotal surface density of11.22kg/m2£¨only1/40of concrete brick wall£©, the averagetransmission loss of up to42.7dB(A).(2) Different polyurethane soft and hard segment proportion has an impact on thesound absorbing performance and the specimen shape, the greater the soft segmentcontent material absorption coefficient, high frequency (1000Hz~4000Hz) soundinsulation the better the performance, but the material forming the more difficult andreduce the sound insulation performance of the stiffness and damping control area.(3) The impact of the thickness of the sound absorbing performance of thecomposite material is mainly concentrated in the low frequency range (63Hz to630Hz), the greater the thickness, the sound absorption coefficients in the lowfrequency range is significantly increased; thickness for the insulation performance ofthe material is mainly concentrated in the high frequency range (1000Hz~6300Hz),the thickness of the larger, the better the sound insulation performance in the mediumand high frequency bands, and more inhibition consistent effect impact.(4) The preparation temperature of the influence of the acoustic performance ofthe composite material through the influence of the polyurethane prepolymer of thecatalyst, the performance of the foaming agent, thereby affecting the foaming processand the material pore structure to affect the absorption coefficient of the material andthe transmission loss, The higher the temperature, the faster the reaction rate, thereaction is more thorough, and the higher the porosity, but the higher operatorrequirements, do not add the scrap steel slag powder, material sound absorptioncoefficient and sound transmission loss sound transmission loss overall as thetemperature increases to65¡æoptimal; scrap steel slag powder is added theabsorption coefficient of the material of different temperatures in the low frequencyrange(63Hz~500Hz) greater impact, and its sound insulation performance125Hz~500Hz and1600Hz~3200Hz frequency range.(5) Different addition amount of the steel slag powder acoustic performance ofthis composite material has a great influence, as the of scrap steel slag powder contentincreases, for its sound absorption properties, sound absorption performance isincreased, particularly for the low-frequency range (63Hz~630Hz) sound absorptionperformance boost, cell scrap slag powder is more uneven; different of scrap steel slagpowder content of the material sound insulation performance for its sound insulationperformance,64Hz~800Hz and1250Hz to3200Hz frequency segment, and Wssp: Wpu polyurethane in the insulation performance with the added amount within the range of0to30%added increases, while in the insulation performance with the added amountwithin a range of30%to70%increase reduced, add the best sound insulationperformance ratio of Wssp: Wpu=3:10.(6) The symmetric composite structure and increased damping layer thickness ofthe two methods can effectively weaken the effects of high frequency band when theanastomosis; arranged in order of sound insulation performance impact of lightweightcomposite sound insulation wall board is not big.(7) By DMA and impact testing machine suction soundproof the foamed corematerial for damping and impact properties study found that: the greater the addedamount of scrap steel slag powder, material damping loss factor decreases, thematerials glass transition temperature (Tg) shift to high temperature, the deteriorationof the impact resistance; increases in the size range from60mesh to80mesh,material damping loss factor value of tan¦Ä with decreasing particle size, the glasstransition temperature (Tg) is shifted to high temperature, material impactperformance is also better when the particle diameter range from80mesh to140mesh, material damping loss factor value of tan¦Ä with decreasing particle sizedecreases, the corresponding glass transition temperature tends to the direction of thelower temperature, the material also will impact performance reduced, the particlediameter of80mesh material damping properties and impact resistance is alsopreferably.
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