Preparation method of magnetorheological elastomer with high heat resistance and tensile properties

Abstract

The invention provides a method for preparing a magnetorheological elastomer with high heat resistance and tensile properties, comprising the following steps: a. Mixing modified carbonyl iron powder, silane coupling agent and methyl vinyl in an internal mixer The silicone rubber is mixed evenly, so that the surface of carbonyl iron powder is coated with a polymer composed of methyl vinyl silicone rubber and silane coupling agent, and then EPDM rubber, plasticizer and reinforcing particles are added for full mixing. Refining to obtain the mixed rubber; b. Put the mixed rubber in the open mill, add anti-aging agent and vulcanizing agent to carry out the rolling and rolling, and then inject the obtained material into the mold, and carry out pre-structural treatment under the magnetic field , and then vulcanized on a flat vulcanizer to obtain a magnetorheological elastomer with high heat resistance and tensile properties. The preparation method of the invention can overcome the technical difficulties in preparing the magnetorheological elastomer by using the EPDM rubber, and exert its excellent performance.

Description

technical field [0001] The invention relates to the technical field of intelligent materials used in vibration reduction and noise reduction, in particular to a preparation method of a magnetorheological elastomer with high heat resistance and tensile properties. Background technique [0002] Magneto-rheological elastomer is a magnetically controlled smart material prepared by dispersing micron-sized magnetic particles into polymer elastomers. It not only has the excellent mechanical properties of particle-reinforced composite materials, but also has rapid, continuous and reversible magnetic properties. It has broad application prospects in the fields of vibration isolation buffer, magnetic control sensing, vibration reduction and sound absorption, etc. However, in terms of the magnetomechanical properties of magnetorheological elastomers, there is a certain contradiction between the magnetorheological effect and the mechanical strength. The currently prepared magnetorheolo...

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Problems solved by technology

[0003] At present, the matrix of magnetorheological elastomers generally chooses rubber polymers such as polyurethane, silicone rubber, and natural rubber. Most of the prepared magnetorheological elastomers have the disadvantages of poor mechanical strength and poor heat resistance.

For a matrix with a higher hardness, in order to obtain a higher magnetorheological effect, it is often necessary to add a large amount of plasticizer to the matrix to soften it, and the use of too much plasticizer seriously affects the mechanical strength of the magnetorheological elastomer. and stability

[0004] EPDM rubber has a fully saturated main chain structure and is a rubber matrix with high mechanical strength and heat resistance. However, due to its high hardness, it is not suitable for preparing magnetic flow with high magnetorheological effect. At the same time, due to the high Mooney viscosity of EPDM rubber and the non-polarity of the molecular chain, it is difficult for the carbonyl iron powder to form an ordered structure under a magnetic field during the vulcanization process, and the formed interface structure is weak, so three The magnetorheological elastomer prepared from ethylene-propylene-diene rubber not only has low magnetorheological effect, but also has poor mechanical properties.

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