A wide temperature range high damping blended rubber material and its preparation method

Abstract

The invention belongs to the technical field of rubber damping materials and discloses a wide-temperature-range high-damping blended rubber material and a preparation method therefor. The blended rubber material is prepared through alternately superimposing natural rubber layers and epoxidized natural rubber layers of n kinds of epoxidation degrees, wherein each kind of epoxidation degree corresponds to one epoxidized natural rubber layer; a gradient of the epoxidation degrees is formed through alternately superimposing the natural rubber layers and the epoxidized natural rubber layers of n kinds of epoxidation degrees; n is an integer and is not smaller than 1; the natural rubber layers employ natural rubber as a main raw material; and each of the epoxidized natural rubber layers of n kinds of epoxidation degrees employs epoxidized natural rubber as a main raw material. The prepared rubber material has the characteristics of wide temperature range and high damping, and meanwhile, the mechanical properties of the rubber material are relatively good.

Description

technical field [0001] The invention belongs to the technical field of rubber damping materials, and relates to a rubber damping material based on natural rubber / epoxidized natural rubber, in particular to a wide temperature range damping blended rubber material and a preparation method thereof. Background technique [0002] Due to its unique viscoelasticity, polymer-based damping materials can convert part of mechanical energy into heat energy under the action of external stress, which can effectively reduce the harm of noise and vibration, and become the most widely used damping and noise reduction materials. [0003] Polymer damping performance is usually evaluated by the height of its internal friction (damping factor tan δ) peak and its span temperature range. Materials with wide temperature range and high damping generally require that the temperature range of tanδ≥0.3 is at least 60°C-80°C. However, the temperature range of the glass transition zone of a single rubbe...

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Problems solved by technology

[0005] The prior art discloses some methods for preparing wide temperature range damping materials based on natural rubber: for example, Chinese patent CN104151636A discloses a method with natural rubber as the matrix, sliding ring material as the high damping phase, and epoxidized natural rubber as the interface phase The method of preparing high-damping materials with compatibilizers, although its effective damping temperature range (tanδ≥0.3) is -55 to 26°C, its damping performance above room temperature is still poor, and tanδ max Only 0.5, it is difficult to fully meet the requirements of the practical application of the ambient temperature; Chinese patent application CN101704282A discloses a method for preparing sulfur-modified gradient rubber materials, using natural rubber as the matrix, sulfur as the vulcanizing agent, and using the concentration of sulfur to diffuse. The wide temperature range damping material has a glass transition range of 72°C, but the degree of vulcanization of each part of the material produced by this method is different, the mechanical properties of the material are not good, and the process conditions are difficult to control, so it is difficult to apply and promote in practice

At present, there are also reports on the use of NR and ENR to prepare blended rubber: For example, Rubber Industry, 2014 (61): 522-526 studied the effect of blending ENR and NR with different degrees of epoxidation on the damping properties of materials, but the prepared The effective damping temperature range (tanδ≥0.3) of the NR / ENR blended rubber material is only -25.4 to 26.6°C, which is difficult to meet the requirements of practical applications

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