| With the rapid development of transportation and industrial activities,noise pollution has become one of the main environmental problems faced by human society,and the isolation and control of noise has been widely studied.Compared with traditional high-quality and high-density soundproofing panels,viscoelastic polymer materials are more suitable for complex and refined industrial environments due to their lightweight and high damping properties.However,traditional viscoelastic polymers have low stiffness and low density and are not suitable for sound insulation materials.The addition of inorganic fillers has been proven to effectively enhance their characteristics and improve the sound shielding ability of polymer materials.Unlike traditional research that uses pure inorganic materials without nanostructures as soundproofing functional fillers,in this paper,we have selected highly ordered mesoporous materials as soundproofing functional fillers and further adjusted the microstructure of the mesoporous materials.The results confirmed that controllable fillers can further optimize the acoustic performance of the composite.Experimental design can optimize the performance of composite materials by controlling the porous structure of added inorganic nanomaterials,providing a promising method for improving acoustic performance.This paper synthesized FDU-15 using a hard template method and added it as a functional filler to a polymer material based on polyacrylate(PA),successfully preparing FDU-15/PA nanocomposite shock absorption and noise reduction material.By transmission electron microscopy(TEM)characterization,it can be seen that the morphology of FDU-15 is sheet-like,with a hexagonal ordered mesoporous structure at high magnification.Its highly ordered micro mesoporous structure provides a large amount of voids and cavities for air capture,which consume sound energy.When the content of FDU-15 is 0.5 wt%,the sound transmission loss(STL)increases by 22.4%,with a peak of up to 32.4 d B.However,high molecular carbon has strong polarity and is prone to mutual adhesion,and it is difficult to evenly distribute it in the substrate using organic dispersants.Therefore,we chose to synthesize micro mesoporous ZSM-5 using hydrothermal method,and synthesized graded hollow ZSM-5 using alkali etching method for post treatment of micro mesoporous ZSM-5.After post-treatment,the microstructure of ZSM-5 was transformed from the original solid structure inside the outer layer of micropores to the hollow structure inside the outer layer of large/medium/microporous hierarchical pores,with hydrogen bonds attached to the surface,improving the uneven distribution of microporous materials in the substrate material.The ZSM-5/PA nano vibration and noise reduction composite material was successfully prepared by adding the two different microstructures of ZSM-5 as functional fillers to the polymer material based on PA,respectively.Under the same addition amount of ZSM-5,the sound insulation performance of the nanocomposite material with graded hollow ZSM-5 is better than that with micro mesoporous ZSM-5.Due to the mismatch in sound between the hollow filler and the polymer,the graded hollow ZSM-5 serves as a hard boundary for sound reflection.When the load of the graded hollow ZSM-5 is 0.5 wt%,the STL increases by 33.4%,and the STL value at the peak reaches up to 40 d B.By adding micro mesoporous materials to the PA matrix,the damping and mechanical properties of nanocomposites were improved.This article uses FDU-15 and graded hollow ZSM-5 to modify PA resin to obtain functional anti-corrosion coatings.We used coating hardness testing,flexibility testing,impact strength testing,adhesion testing,contact angle testing,salt spray resistance testing,etc.to explore the influence of FDU-15 and ZSM-5 content on various aspects of coating performance.The experimental results show that when the content of layered hollow ZSM-5 is 2wt%,the hardness of ZSM-5/PA coating is 4H,the adhesion force is 4.53 MPa,and the contact angle is small θ = 118.3 °,with strong salt spray resistance,meeting practical production and usage needs. |
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