A kind of preparation method of intelligent magnetic noise reduction polyurethane foam

Abstract

The invention belongs to the technical field of environmental protection and particularly relates to a preparation method of intelligent magnetic noise-reducing polyurethane foam. The preparation method comprises the following specific steps: treating the surface of carbonyl iron powder with a silane coupling agent; mechanically dispersing and prepolymerizing treated carbonyl iron powder, polyhydric alcohol and a chain extender; adding a crosslinking agent, a surfactant, a catalyst and isocyanate, rapidly stirring and pouring; and under the action of an external magnetic field, enabling carbonyl iron particles to form chain structures and be arranged in a foam skeleton and foaming at room temperature to produce anisotropic magnetic polyurethane foam. The entire preparation process has specific flow and is relatively simple and convenient to operate. The magnetic polyurethane foam is prepared by a one-step foaming process, the product combines the advantages of magnetic particles and polyurethane foam, has a flexible damping characteristic and is conductive to weakening the sound so that controllable acoustic and mechanical properties are achieved and the magnetic polyurethane foam can be used as a sound-absorption noise-reducing material. The magnetic polyurethane foam can be applied in fields such as civil use, automobiles and aerospace and has higher application values.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of an intelligent magnetic noise-reducing polyurethane foam. Background technique [0002] With the continuous development of the national economy, national defense and society, noise pollution and control has become a key issue to be solved, in which flexible media and polymer foam materials play an important role. Traditional polymer foam materials such as polyurethane, polyvinyl chloride and rubber have been widely used in aerospace, national defense and military, construction and other fields due to their good sound absorption and vibration reduction effects; but these sound absorption materials are isotropic materials, and their The magnetic particles are randomly impregnated in the pores or voids of the open-cell foam. The structure of the magnetic particles is loosely connected. Their response to the magnetic field is very ...

AI Technical Summary

Problems solved by technology

Traditional polymer foam materials such as polyurethane, polyvinyl chloride and rubber have been widely used in aerospace, national defense and military, construction and other fields due to their good sound absorption and vibration reduction effects; but these sound absorption materials are isotropic materials, and their The magnetic particles are randomly impregnated in the pores or voids of the open-cell foam. The structure of the magnetic particles is loosely connected. Their response to the magnetic field is very weak, and they are only effective for sound waves in the middle and high frequency ranges. For low frequency sound waves less than 500Hz, Poor sound absorption performance, far from meeting the needs of various applications, thus limiting its application range