Micro-particle sound-absorbing board and preparation method thereof

Abstract

The invention discloses a micro-particle sound-absorbing board and a preparation method thereof. The micro-particle sound-absorbing board comprises a binding agent and sound-absorbing particles, wherein the outer surfaces of the sound-absorbing particles is coated with a layer of the binding agent; the angular coefficient of the particles coated with the binding agent is less than 1.3; the sound-absorbing particles comprise skeleton particles and filling particles; the skeleton particles are used for forming a skeleton of the sound-absorbing board; the filling particles enter pores among the skeleton particles to form sound-absorbing gaps; the average diameter of a cross section of the sound-absorbing gap is 0.07mm. Meanwhile, a two-section manufacturing process namely first-film-coating and second-curing-shaping of the sound-absorbing board can be used for avoiding an excessive amount of the binding agent from blocking the gap among the particles and further improving the angular coefficient of the particles. Therefore, the micro-particle sound-absorbing board and the preparation method of the micro-particle sound-absorbing board can be used for ensuring the structural strength of the sound-absorbing board and improving the sound-absorbing coefficient of the sound-absorbing board at the same time, and can obtain relatively good sound-absorbing effects.

Description

technical field [0001] The invention relates to sound-absorbing materials for buildings, in particular to a particulate sound-absorbing board and a preparation method. Background technique [0002] Sound-absorbing materials are materials that absorb incident sound energy by virtue of their own porosity, thin-film action or resonance. According to their physical properties and sound-absorbing methods, they can be divided into two categories: porous sound-absorbing materials and resonant sound-absorbing structures. . [0003] The structural feature of porous sound-absorbing materials is that there are a large number of interpenetrating and open micropores inside the material. The principle of sound absorption is that after sound waves enter the pores of the material, the air in the pores and the tiny fibers of the material vibrate, resulting in friction and friction. Viscous resistance, sound energy is converted into heat energy and absorbed. There are two types of fiber mate...

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Problems solved by technology

Although there are many types of this type of sound-absorbing materials, due to the limitation of the production method, pore-forming mechanism and structural strength, their porosity is low, the sound absorption coefficient is low, and the sound absorption effect is not good, so they have not been widely promoted.

[0005] For example, the patent application No. 201210398344.3 discloses a sandstone environmental protection sound-absorbing board, which is made of natural round sand particles or natural colored round sand particles mixed with epoxy resin glue and then pressed into a plate to form a base layer, expanded perlite particles and epoxy resin glue After mixing, it is pressed on the board to form a light layer, and the mesh cloth is pressed on the light layer to play the role of strength tension and skeleton. Four-layer structure, complex structure, many manufacturing processes, high cost

The pore-forming mechanism of the base layer and the light layer in the brick-rock environmental protection sound-absorbing board is that the natural pores that appear after the evaporation of water molecules and the curing of the epoxy resin play a role in sound absorption, and the voids formed by the evaporation of water molecules are intermittent and random. Therefore, its porosity is unpredictable, and most of the voids formed by the evaporation of water molecules are closed cells that cannot ventilate and store gas. This closed cell cannot complete the sound absorption function, so its sound absorption coefficient is uncertain. The sound absorption effect is not good

Moreover, due to the irregularity of the outer surface of the sand grains, the specific surface area of ​​the sand grains is increased, and the amount of adhesive is increased, so that the cost of the sound-absorbing panel remains high, which affects its popularization and use.

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