Piezoelectric and conductive grafting type polyurethane base composite damping material and preparation method thereof

Abstract

The invention provides a piezoelectric and conductive grafting type polyurethane base composite damping material and a preparation method of the material. The preparation method comprises the following steps of: evenly mixing the mixture of main chain substrate and branch chain substrate with mass ration of 2:1 in grafting type polyurethane substrate, piezoelectric ceramic particles accounting for 20-70wt% of the mixture, conductive particles accounting for 0.5-1.5wt% of the mixture and cross-linking agent trimethylolpropane, wherein the molar ratio between -NCO in the main chain substrate and -OH in cross-linking agent is equal to 1: 1.2; and curing at the temperature of 10 DEG C, and obtaining the piezoelectric and conductive grafting type polyurethane base composite damping material. The damping material has the peak value of the loss factor tan delta reaching up to about 1.0, and the peak value reaches more than 0.3 within a wider temperature range. The damping material is simple in preparation technology, low in cost and good in damping performance. The damping material can be used as a damping noise reduction material and applied to the fields such as a ship, the ocean, traffic, a large machine and the like.

Description

technical field [0001] The invention relates to a damping material, and also relates to a preparation method of the damping material. Specifically, it relates to a piezoelectric-conductive grafted polyurethane-based composite damping material and a preparation method thereof. Background technique [0002] Mechanical vibration widely exists in the power system. Damping is one of the methods to effectively control vibration and noise in vibration reduction and noise reduction technology. It converts vibration mechanical energy into heat energy and dissipates it, so as to achieve the purpose of vibration reduction and noise reduction. Therefore, damping materials are an important part of damping and vibration reduction technology, and have always been a research hotspot in this field. [0003] In recent years, intelligent damping materials have attracted widespread attention. Its damping mechanism is mainly composed of three parts: first, friction between polymer molecular c...

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Problems solved by technology

[0004] At present, there are many public reports about piezoelectric-conductive damping materials, for example: Chinese patent publication numbers CN101392090, CN101323697, Japanese patent publication number JP2002069424 (A), etc. all disclose epoxy resin-based piezoelectric conductive damping materials. Although oxygen resin has excellent high-temperature performance, it is not suitable for low-temperature environments, and its toughness is not ideal; and Chinese Patent Publication No. CN1376734 discloses using polyvinylidene fluoride as a matrix material, piezoelectric ceramics as a piezoelectric material, and conductive carbon black. As a damping and vibration-damping composite material of conductive material, it has good damping properties

Polyurethane elastomers have been widely used as damping and noise-reducing materials in recent years in the fields of ships, oceans, transportation, large machinery, construction, etc., but piezoelectric-conductive damping materials prepared with polyurethane as a matrix have not been publicly reported.

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