Slow rebound polyurethane foam sound insulation material

Abstract

The invention discloses a slow rebound polyurethane foam sound insulation material. The slow rebound polyurethane foam sound insulation material is characterized by being prepared from the following components in parts by weight: 35-55% of a material B, 5-35% of polyether polyol A, 10-30% of polyether polyol B, 5-20% of polyether polyol C, 0-0.5% of A-1, 0.1-1% of A-33, 0.1-1% of dimethylethanolamine (DMEA), 1-5% of ethylene glycol (EG), 0.1-1% of mixed silicone oil and 2-8% of fluoro-dichloroethane, wherein the material B is a prepolymer modified by diphenylmethane diisocyanate and derivatives thereof as well as polyol; the A-33 is an alcoholic solution prepared by melting triethylene diamine into small molecular dihydric alcohol; the A-1 is prepared from bis(dimethylamino-ethyl) ether and dipropylene glycol (DPG). The slow rebound polyurethane foam sound insulation material provided by the invention has a unique foam structure and a high loss factor; when incoming sound waves are transmitted to the slow rebound polyurethane material, the sound energy is further consumed, so that the slow rebound polyurethane material is good in sound insulation; furthermore, the slow rebound polyurethane foam sound insulation material is uniform in openings, and has better tensile strength and tear strength.

Description

technical field [0001] The invention relates to the technical field of sound insulation, in particular to a polyurethane foam sound insulation material. Background technique [0002] Noise pollution, together with air pollution and water pollution, has been recognized as the three major contemporary pollutions, which has aroused people's great attention. The prevention and control of noise pollution has become a major issue to be solved in the world today. In order to effectively prevent occupational noise hazards and promote the full and rapid implementation of hearing protection programs in our country, research on a new type of material is an urgent problem that we need to solve. In noise control, according to the law of mass, sound insulation materials often improve the sound insulation by increasing the mass, but they are relatively bulky in practical applications. [0003] Due to the light weight and softness of polyurethane foam materials, and its high viscoelastic ...

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Problems solved by technology

[0004] In the prior art, on the one hand, a film can be coated on the surface of the polyurethane foam material, which is equivalent to connecting an acoustic mass element in series on the surface of the material, so that the first resonant frequency moves to the low frequency direction, and the first resonant frequency of the porous sound-absorbing material is utilized. This principle is determined by the imaginary part of the complex normal acoustic impedance of the material. The results show that when the density of the coating film is appropriate, the sound absorption performance extends to low frequencies, so it is relatively difficult to control. On the other hand, the application of porous inorganic The characteristics of sound-absorbing materials, the preparation of foamed polyvinyl chloride inorganic mixed sound-absorbing materials, the use of inorganic materials in the low-frequency part of the excellent sound-absorbing performance to improve the low-frequency sound-absorbing performance of foamed polymer materials, but the time for new material technology innovation And the addition of fillers brings the problem of unstable physical properties of sound insulation materials

[0005] In addition, the production of slow rebound PU on the molding line also has an immature mass production process, because the required process is strict and the aging is slow, and it needs to be reshaped in the later stage to keep it in a certain shape. In this way, Undoubtedly increased the cost of manpower and material resources

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