Technique for recovering hydrogenated nitrile-butadiene rubber

Abstract

The invention discloses a technique for recovering hydrogenated nitrile-butadiene rubber, relating to a processing technique for recovering and regenerating waste and old hydrogenated nitrile-butadiene rubber materials. The invention can promote the rupture of the carbon-sulfur bond in an atmospheric pressure and temperature environment so as to restore the linear structure of the rubber. The technique uses waste and old hydrogenated nitrile-butadiene rubber as the raw material, and sequentially comprises the steps of cleaning, grinding, impurity removal, recovery reaction and mixing, wherein the recovery reaction is implemented by adding 1.5-2.5 wt% of recovering agent into the raw material; the recovering agent is composed of zinc diethyl dithiocarbamate, mercaptobenzothiazole and zinc oxide; and the mixing step is implemented at 18-30 DEG C for 28-48 minutes with a mixer. The technique is implemented in a way that: the recovering agent is added into waste and old hydrogenated nitrile-butadiene rubber particles, evenly stirred, and repeatedly rolled under atmospheric pressure and temperature to initiate replacement reaction by using the shearing force and temperature generated by the shearing friction force, so that the carbon-sulfur bond is ruptured, sulfur is ionized, and the molecular reticular structure in the waste rubber is restored into the linear structure in the rubber mixing process, thereby restoring the plasticity of the rubber.

Description

technical field [0001] The invention relates to a processing technology for recovering and regenerating waste and old hydrogenated nitrile rubber materials. Background technique [0002] The continuous deepening of hydrogenated nitrile rubber in the application field of rubber makes the importance of hydrogenated nitrile rubber increasingly reflected, but there are problems: first, it is expensive; second, waste is difficult to degrade. Therefore, its recovery and reuse has become a research and development direction in this field. [0003] The current recovery technology is to grind hydrogenated nitrile rubber waste into powder and add it for use, but the effect of the recovered product is poor, and the maintenance of physical properties is slightly lower. [0004] Referring to the current recovery process of recycled rubber, it is generally desulfurized under high temperature and high pressure, and sulfur is brought into the air, generating a large amount of harmful exhau...

AI Technical Summary

Problems solved by technology

[0002] The continuous deepening of hydrogenated nitrile rubber in the rubber application field makes the importance of hydrogenated nitrile rubber more and more reflected, but there are problems: first, the price is expensive; second, the waste is difficult to degrade

[0003] The current recovery technology is to grind hydrogenated nitrile rubber waste into powder and add it for use, but the effect of the recovered product is poor, and the retention of physical properties is slightly lower

[0004] Referring to the current restoration process of recycled rubber, it is generally desulfurized under high temperature and high pressure, and sulfur is brought into the air, producing a large amount of harmful exhaust gas

The regeneration of hydrogenated nitrile rubber has always been a difficult point. Due to its high vulcanization bond energy, it is basically impossible to use this high-temperature desulfurization process for recovery and regeneration.

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