Abstract: The present invention discloses a sound absorption material including an organic frame material; a binder; a thickener; and a plurality of sound absorption grains attached to the organic frame material via the binder, having a grain size in a range of 10-100 ?m. The stability and the sound absorption performance of the sound absorption material have been effectively improved.

Abstract: This application provides a benzoxazine resin and a preparation method thereof, and an adhesive. The benzoxazine resin is represented by the following formula: where R1, R2, R3 and R4 are each independently selected from the group consisting of —H, alkyl, alkoxy, cycloalkyl, and aryl, and at least one of R1, R2, R3 and R4 is —H; X1 is an alkyl or/and alkoxy containing a long chain structure in main chain or side chain; X2 is one or more selected from alkyl, ether group, alkoxy, alkyl ester group, carbonyl, sulfone group, and thioether group; and n is 1-150.

Abstract: This application provides a resin composition and an adhesive. The resin composition is composed of benzoxazine and a resin. The benzoxazine is synthesized from a primary amine-capped flexible polyimide oligomer, an aldehyde and a monofunctional phenolic compound. The resin contains one or more of an epoxy resin, a maleimide resin, and a cyanate ester resin containing two or more functional groups. The resin is 0.1%-70% by weight of the benzoxazine.

Abstract: A sound-absorbing material block, a method for preparing the same and application thereof are provided. The sound-absorbing material block includes three-dimensional open-cell foam, sound-absorbing material powder, a binder, a gel, and a cross-linking agent. The sound-absorbing material powder is bonded to each other and connected to the three-dimensional open-cell foam by means of the gel, the cross-linking agent, and the binder, by mass of the sound-absorbing material powder, the gel accounts for 1 wt % to 5 wt % of the sound-absorbing material powder, and the binder accounts for 1 wt % to 8 wt % of the sound-absorbing material powder, and by mass of the gel, the cross-linking agent accounts for 1 wt % to 10 wt % of the gel. The sound-absorbing material block according to the present disclosure reduces an additive amount of the binder, and significantly improves sound-absorbing performance and strength of the material block.

Abstract: A molecular sieve sound-absorbing material, a method for preparing the same, and a speaker. The sound-absorbing material includes a modifying molecular sieve and a binder, the mass of the binder accounts for 2% to 10% of the mass of the modifying molecular sieve, the modifying molecular sieve is obtained by performing phosphorus modification on a molecular sieve, a mass ratio of silicon to aluminum in the molecular sieve is (50-800):1, and a molar ratio of phosphorus to aluminum in the modifying molecular sieve is (0.1-2):1. The sound-absorbing material includes a phosphorus-modifying molecular sieve. Application of the modifying molecular sieve to the sound-absorbing material can ensure that the sound-absorbing material can also maintain good sound absorption performance under high-temperature and high-humidity conditions.

Abstract: Provided is a sound-absorbing material, including a metal-organic framework material having a microporous structure. The metal-organic framework material includes a coordinated metal M and organic framework materials (OFs) coordinated with the coordinated metal. The microporous structure includes a plurality of uniformly distributed micropores, and a diameter of each of the plurality of micropores is within a range of 0.3 nm to 1.2 nm. The sound absorbing material including the metal-organic framework material can be added into a speaker to increase the acoustic compliance of air in a rear cavity of the speaker, thereby improving the performance of the speaker in a low frequency range.

Abstract: A porous composite sound-absorbing material and a method for preparing the same are provided. The porous composite sound-absorbing material includes activated carbon cotton felt, zeolite particles, and an adhesive. The activated carbon cotton felt can bond the zeolite particles to fiber surfaces thereof by means of the adhesive, so that the zeolite particles are evenly dispersed and fixed and achieve optimal sound absorption performance. Meanwhile, a large number of micro-pore structures on surfaces thereof can act synergistically with the zeolite particles, so that the porous composite sound-absorbing material has significantly better sound absorption performance than the two and has extremely high cost performance. During the preparation process, the activated carbon cotton felt after treatments, is successfully compounded with the zeolite particles with more excellent sound absorption performance, so that the sound absorption performance is significantly improved and the cost performance is extremely high.

Abstract: The invention relates to the technical field of heat dissipation, and specifically provides a capillary structure element of a cooling element, wherein the capillary structure is formed by copper metal paste. The copper metal paste includes copper powder, binder, solvent, pore former, dispersant, stabilizer, surfactant, and antioxidant. The present invention also provides a cooling element comprising the capillary structure element and a preparation method thereof. The capillary structure element provided by the invention is arranged with the advantages of simple preparation process, convenient operation, controllable thickness, controllable size and hole diameter, excellent capillary effect and the like, and is especially suitable for preparing ultra-thin cooling elements.

Abstract: The present invention discloses a sound absorption material including an organic frame material; a binder; a thickener; and a plurality of sound absorption grains attached to the organic frame material via the binder, having a grain size in a range of 10-100 ?m. The stability and the sound absorption performance of the sound absorption material have been effectively improved.

Abstract: The present invention provides a gas adsorbent comprising a number of microspheres formed by agglomeration of zeolite and adhesive. Among the plurality of microspheres, at least some of the microspheres have a porous structure and contain inflatable balls inside. In the present invention, the high molecular polymer expansion ball is added into the zeolite microsphere, and more pore structures are created in the zeolite microsphere by utilizing its characteristics of expansion, solidification and rupture at different temperatures. Thus, the adsorption capacity of the zeolite microsphere to air is increased to achieve a better frequency reduction effect.

Abstract: A reel mechanism and a winding device for a flexible copper clad laminate includes a rotating roller, a winding belt wound on the rotating roller for winding the flexible copper clad laminate, first and second limit structures arranged one side of the winding belt away from the rotating roller. A space between the first limit structures and the second limit structures accommodates the flexible copper clad laminate. When the winding belt is wound with multiple layers outside the rotating roller, adjacent layers of the winding belt are spaced apart by the first and second limit structures. Since a protruding height of the first limit structures is equal to a protruding height of the second limit structures, and intervals between adjacent layers of a composite coil formed by the winding belt and the flexible copper clad laminate are equal, which avoids adhesion and copper foil surface oxidation.

Abstract: Provided is a sound-absorbing material, including a metal-organic framework material having a microporous structure. The metal-organic framework material includes a coordinated metal M and organic framework materials (OFs) coordinated with the coordinated metal. The microporous structure includes a plurality of uniformly distributed micropores, and a diameter of each of the plurality of micropores is within a range of 0.3 nm to 1.2 nm. The sound absorbing material including the metal-organic framework material can be added into a speaker to increase the acoustic compliance of air in a rear cavity of the speaker, thereby improving the performance of the speaker in a low frequency range.

Abstract: Provided is a sound-absorbing material, including an adsorbent material and a thermal conductive material. The thermal conductive material is uniformly dispersed in the sound-absorbing material. The thermal conductive material includes a carbon fiber material, and a weight ratio of the carbon fiber material in the sound-absorbing material is within a range of 0.05% to 10%. Further provided are a preparation method of the sound-absorbing material and a speaker using the sound-absorbing material. The sound-absorbing material has higher thermal conductivity and can be added to a rear cavity of the speaker to effectively conduct heat generated when the speaker is working, thereby improving the heat dissipation performance of the speaker.

Abstract: The present application provides a sound adsorbing material, including a microporous material and an adsorbate gas adsorbed in the microporous material. The microporous material includes a zeolite molecular sieve, and the zeolite molecular sieve has a framework and extra-framework cations. An adsorption capacity of the adsorbolite molecular sieve to the adsorbate gas is greater than an adsorption capacity of the adsorbolite molecular sieve to air. The present disclosure further provides a speaker box adopting the sound adsorbing material. Compared with the related art, the sound adsorbing material provided by the present disclosure has good application effects, and the speaker box using the sound adsorbing material has a better low frequency acoustic performance.

Abstract: The present disclosure provides a sound absorbing material. The sound absorbing material comprising MFI-structural-type molecular sieves, the MFI-structural-type molecular sieves comprises frameworks and extra-framework cations, the framework comprising SiO2 and a metal oxide MxOy containing a metal element M, wherein a molar ratio of Si/M is between 220 and 600 in the framework, the metal element M comprises aluminum, and the extra-framework cations are at least one of hydrogen ions, alkali metal ions and alkaline earth metals. The present also provides a method for preparing a sound absorbing material and a speaker box using the sound absorbing material.

Abstract: The present disclosure provides a sound absorbing material. The sound absorbing material comprises MFI-structural-type zeolite. The MFI-structural-type zeolite comprises a framework, and the framework comprises SiO2 and AlO3, and the mass ratio of Si to Al in the framework is less than 200 and not less than 50. The present disclosure also provides a speaker box applying the sound absorbing material. The sound absorbing material provided by the present disclosure and the speaker box using the sound absorbing material can further improve the performance of the speaker box, reduce the failure of zeolite and improve the performance stability of the speaker box.

Abstract: The present disclosure relates to a molecular sieve, preparation thereof and acoustic absorption material and speaker containing the same. The molecular sieve having an MFI-structure, comprising a framework and an off-framework cation, wherein the framework comprises SiO2 and a metal oxide MxOy with M comprising boron, gallium or aluminium; the off-framework cation is at least one of hydrogen ion, alkali metal ion and alkaline earth metal ion. The molecular herein can effectively prevent the failure of the molecular sieve and improve the performance stability of the speaker.

Abstract: The present disclosure provides a sound absorbing material. The sound absorbing material comprising a heteroatom zeolite molecular sieve comprising a framework and an extra-framework cation, the framework comprising SiO2 and a metal oxide MxOy comprising a metal element M, wherein the framework has a molar ratio of Si/M between 250 to 500, wherein the M includes Fe, and that the extra-framework cation is at least one of a monovalent copper ion, a monovalent silver ion, a monovalent gold ion, an alkali metal ion or an alkaline earth metal ion. The sound absorbing material provided by the present disclosure, sound absorbing material to have better oxygen adsorption capacity, good waster repellency and stability. When such a sound absorbing material is applied to a speaker box, the speaker box will have better low frequency acoustic performance and better reliability.

Abstract: A prepreg is a blend of a fiber reinforcement, a matrix resin and a filler. Based on 100 parts by mass of the prepreg, the fiber reinforcement is 20-60 parts by mass, the matrix resin is 20-65 parts by mass, and the filler is 10-40 parts by mass. The filler is a flame-retardant organic microsphere or a blend of the flame-retardant organic microsphere and an inorganic filler, and the particle size of the filler is preferably 0.1 microns to 15 microns. A copper-clad laminate and a printed circuit board are also disclosed. In various embodiments, the stability of material properties of the prepreg can be improved, the prepreg manufacturing process is simplified, the prepreg production efficiency is improved. Due to the high production efficiency of the prepreg, the manufacturing cost of the prepreg, the copper-clad laminate and the printed circuit board can be reduced.

Abstract: A copper-clad laminate includes an insulating substrate and a copper foil layer covering a surface of the insulating substrate. The insulating substrate includes at least one first insulating layer, and the first insulating layer is a blend of a surface fiber felt made of fibers and resin or a blend of a non-woven fabric-reinforced composite material and resin, and the copper foil layer is attached to an outer surface of the first insulating layer. The present disclosure also provides a printed circuit board, which is made from the copper-clad laminate of the present disclosure. The present disclosure also provides a method for manufacturing the printed circuit board. Compared with the related arts, the copper-clad laminate and the printed circuit board of the present disclosure have improved dielectric properties.