Preparation method of polyurethane/ferroferric oxide/fibrofelt flexible noise reduction composite material

Abstract

The invention discloses a preparation method of a polyurethane / ferroferric oxide / fibrofelt flexible noise reduction composite material. The preparation method comprises the following steps: setting a stirrer to operate at 1500r / min to stir polyurethane resin, and adding a certain amount of ferroferric oxide, dispersing agent, flatting agent and defoaming agent during stirring until the mixture is uniformly mixed; adding a proper amount of thickening agent and conducting stirring for 5 minutes to obtain a required coating; performing vacuum treatment on the coating to eliminate bubbles until the coating does not have bubbles, thereby finishing the preparation of coating liquid; fixing a metal plate on a film coating machine, spraying a certain amount of release agent, adjusting the thickness of a coating rod to be 1mm, coating the metal plate with the prepared coating liquid, conducting drying at 80 DEG C, and conducting demolding to obtain a flexible polyurethane / ferroferric oxide composite film; and then coating the surface with a layer of thin resin, placing the prepared flexible polyurethane / ferroferric oxide composite film on the surface for compounding, and conducting drying, so as to complete the preparation of the polyurethane / ferroferric oxide / fibrofelt flexible noise reduction composite material.

Description

technical field [0001] The invention belongs to the field of acoustic functional materials for noise absorption, and in particular relates to a preparation method of polyurethane / ferric oxide / fiber mat flexible noise reduction composite material. Background technique [0002] With the rapid development of global industry and transportation systems, noise pollution has become more and more harmful to human health and the environment, and has been regarded as the second killer of human public health after air pollution. According to research, noise ranks third among the inducing factors of human stress, and the rate of myocardial infarction increases by about 30% for residents living next to highways. According to the World Health Organization (WHO) report, it is estimated that by 2050, nearly 2.5 billion people in the world (that is, one in four people) will have some degree of hearing problems. In addition to affecting the human auditory system, the harm caused by noise may...

AI Technical Summary

Problems solved by technology

In addition to affecting the human auditory system, the harm caused by noise may also cause various diseases such as high blood pressure, heart disease, memory loss, inattention, respiratory system, circulatory system and other mental syndromes. thereby shortening human life

[0003] As one of the common sound-absorbing materials, fiber products have certain sound-absorbing properties, but basically do not have sound-insulating properties.

And because the fiber mat uses heat loss for sound absorption, so to achieve a good sound absorption effect, its thickness usually needs to be greater than 20mm, and a single fiber material has low strength and poor stability, which will cause inconvenience to installation, and the same fiber material is different. Sound absorption frequency is fixed and non-adjustable

Therefore, the use of a single fiber material as a sound-absorbing material has many limitations.

[0004] The object of the present invention is to overcome the above-mentioned shortcomings such as thicker fiber material thickness, fixed resonance frequency, and lack of sound insulation performance, and provides a method for preparing polyurethane / ferric oxide / fiber felt flexible noise-reducing composite material. The composite membrane is bonded to the fiber mat to improve its sound absorption and sound insulation performance while maintaining the flexibility of the fiber mat itself, and to control the resonant frequency of the material without increasing the thickness according to the content of ferroferric oxide. position, in order to achieve the adjustability of the sound absorption effect of the material. Compared with the noise reduction material prepared by using one type or one material, the noise reduction effect is excellent, which can provide a reference for the development of new noise reduction materials

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