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Method for enhancing damping capacity of rubber by adding neodymium-iron-boron magnetic powder

A neodymium-iron-boron and magnetic powder technology, which is applied to magnetic materials, magnetic objects, electrical components, etc., can solve the problems that neodymium-iron-boron magnetic rubber is not suitable for application, and the coercivity of neodymium-iron-boron materials is low. Effectively damping the effect of increasing the temperature range and increasing energy conversion

Active Publication Date: 2014-12-03
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coercive force of NdFeB material is low, which makes NdFeB magnetic rubber not suitable for application at higher temperatures

Method used

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  • Method for enhancing damping capacity of rubber by adding neodymium-iron-boron magnetic powder
  • Method for enhancing damping capacity of rubber by adding neodymium-iron-boron magnetic powder
  • Method for enhancing damping capacity of rubber by adding neodymium-iron-boron magnetic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Plasticize 100 parts by mass of butyl rubber on an open mill, then add 50 parts by mass of carbon black reinforcing agent, 20 parts by mass of isotropic fast-quenching NdFeB magnetic powder with a particle size of 100 microns, 2 mass parts Part sulfur, 5 parts by mass of zinc oxide, 1.5 parts by mass of stearic acid were mixed for 5 minutes to obtain a mixture;

[0029] 2) Put the mixture in the mold, apply a pressure of 5 Pa to the mold, and keep it at 120°C for 30 minutes for vulcanization to obtain vulcanized rubber;

[0030] 3) Place the vulcanized rubber under a 5T magnetic field and magnetize it for 1 second to obtain a high-damping NdFeB magnetic rubber.

[0031] The result is as figure 1 As shown, compared with ordinary butyl rubber, the maximum damping coefficient of NdFeB magnetic rubber with 20 mass parts of magnetic powder is increased from 0.85 to 0.98 at 50, an increase of 15%, and the damping performance is significantly improved.

Embodiment 2

[0033] 1) Plasticize 100 parts by mass of nitrile rubber on a calender, then add 35 parts by mass of carbon black reinforcing agent, 60 parts by mass of anisotropic fast-quenching NdFeB magnetic powder with a particle size of 1 micron, 1.5 parts by mass Sulfur, 5 parts by mass of zinc oxide, and 1 part by mass of stearic acid were kneaded for 5 minutes to obtain a mixture;

[0034] 2) Put the mixture in the mold, apply a pressure of 15Pa to the mold, and keep it at 150°C for 10 minutes for vulcanization to obtain vulcanized rubber;

[0035] 3) Place the vulcanized rubber under a 4T magnetic field for 5 seconds to obtain a high-damping NdFeB magnetic rubber.

[0036] Compared with ordinary butyl rubber, the maximum damping coefficient of NdFeB magnetic rubber with 60 mass parts of magnetic powder increased from 0.84 to 1.05 at 50, an increase of 25%, and the damping performance was significantly improved.

Embodiment 3

[0038] 1) Plasticize 100 parts by mass of silicone rubber on a mixer, then add 50 parts by mass of white carbon black reinforcing agent, 120 parts by mass of isotropic injection-molded NdFeB magnetic powder with a particle size of 70 microns, and 0.8 parts by mass of sulfur , mixed for 15 minutes to obtain a mixture;

[0039] 2) Put the mixture in the mold, apply a pressure of 20Pa to the mold, and keep it at 170°C for 20 minutes for vulcanization to obtain vulcanized rubber;

[0040] 3) Place the vulcanized rubber under a 1.5T magnetic field for 10 seconds to obtain a high-damping NdFeB magnetic rubber.

[0041] Compared with ordinary silicone rubber, the maximum damping coefficient of NdFeB magnetic rubber with 120 mass parts of magnetic powder increased from 0.34 to 0.40 at 50, an increase of 18%, and the damping performance was significantly improved.

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Abstract

The invention discloses a method for enhancing damping capacity of rubber by adding neodymium-iron-boron magnetic powder, which comprises the following steps: 1) plasticizing 100 parts by mass of rubber on milling equipment, sequentially adding 1-50 parts by mass of reinforcing agent, 20-120 parts by mass of neodymium-iron-boron magnetic powder, 0.1-5 parts by mass of sulfur, 0.1-5 parts by mass of zinc oxide and 0.1-5 parts by mass of stearic acid, and milling for 5-20 minutes to obtain a mixture; 2) putting the mixture in a mold, applying a pressure of 5-50Pa onto the mold, and vulcanizing at 120-200 DEG C for 5-30 minutes to obtain vulcanized rubber; and 3) putting the vulcanized rubber in a 0.5-5T magnetic field to carry out magnetization for 1-60 seconds, thereby obtaining the high-damping neodymium-iron-boron magnetic rubber. The damping capacity of the rubber obtained by adding the neodymium-iron-boron magnetic powder can be maximally enhanced by more than 25% within a wide frequency range and a wide temperature range.

Description

technical field [0001] The invention relates to a method for improving the damping performance of rubber by adding NdFeB magnetic powder. technical background [0002] With the rapid development of modern technology and modern industry, mechanical equipment tends to be high-speed and automatic, so a series of problems such as vibration, noise, fatigue and fracture will inevitably occur, which will affect the machining accuracy and product quality of the machine, and accelerate the mechanical structure. fatigue damage, shorten the service life of machinery, pollute the environment, and endanger people's health. Therefore, reducing vibration and noise and improving the working environment of man-machine is an urgent problem to be solved. Rubber materials play an important role in vibration and noise reduction due to their high damping and low density. [0003] The damping behavior of rubber materials is the process in which the macromolecular segments generate relative mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/22C08L9/02C08L9/06C08L11/00C08L83/04C08L75/04C08L23/16C08L7/00C08L9/00C08K13/02C08K3/38C08K3/22C08K5/09C08K3/06C08J3/24H01F1/057
Inventor 严密魏迪永赵宇航包大新
Owner ZHEJIANG UNIV
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