Preparation method of low-internal-loss medium-resistant polyurethane elastomer material for vibration isolators

Abstract

The invention relates to a preparation method of a low-internal-loss medium-resistant polyurethane elastomer material for vibration isolators. The preparation method comprises the following steps: preparing polyurethane unvulcanized rubber, preparing a mixed rubber material, and preparing the polyurethane elastomer material. The polyurethane unvulcanized rubber contains polyether glycol or polyester polyol, aromatic organic diisocyanates and glycerol alpha-allyl ether; and the mixed rubber material contains a reinforcing filler, a vulcanizing agent and an accelerator. The prepared mixed rubber material is subjected to sheet discharge, cutting, put in a metal mold, and subjected to heating and press vulcanization molding on a hot press, thereby preparing the polyurethane elastomer material, wherein the heating temperature is controlled at 130-150 DEG C, the pressure is controlled at 8-12 MPa, and the vulcanization molding is controlled at 25-50 minutes. The method eliminates the factors for increasing internal loss due to asymmetric molecular chain, and improves and enhances the medium resistance of the polyurethane elastomer material.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for preparing a low internal friction and medium-resistant polyurethane elastomer material for a vibration isolator. Background technique [0002] Rubber vibration isolator is the most widely used type of vibration isolator. It has the advantages of compact structure, good manufacturability, and low cost. It can be vulcanized into any geometric shape according to the structural requirements of the load-bearing equipment. Generally, in order to adapt to the application environment, nitrile rubber and natural rubber with excellent oil resistance are mostly used. However, with the prolongation of the use time of the rubber vibration isolator, there will be phenomena such as material aging and performance degradation, resulting in a short service life of the rubber vibration isolator, and various forms of failure will appear in only 7 to 10 years. [0003] In a...

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Problems solved by technology

However, with the extension of the service time of the rubber vibration isolator, there will be phenomena such as material aging and performance degradation, resulting in a short service life of the rubber vibration isolator, and various forms of failure will appear in only 7 to 10 years

[0003] In addition, due to the serious aging phenomenon of the rubber vibration isolator during storage, its service life is further shortened, and even some rubber vibration isolators have failed before installation. Once the rubber vibration isolator fails, it must be maintained and replaced in time, otherwise it will directly Affect the safety of equipment, and there are problems such as difficulty, high cost, and poor mobility when replacing

[0004] There are also TDI and MDI as reaction raw materials to synthesize cast polyurethane elastomer materials and manufacture polyurethane vibration isolators. The vibration damping effect is good, but the internal friction of the cast polyurethane elastomer material is large, and the heat generation is serious, resulting in insufficient aging resistance, which seriously affects the performance of the cast polyurethane vibration isolator and limits its application to a certain extent

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