A kind of method for preparing recycled rubber at one low temperature

Abstract

The invention relates to a method for preparing regenerated rubber at low temperature at one time, belonging to the technical field of rubber regeneration. In this method, vulcanized rubber powder, auxiliaries and plasticizers are added to a high-shear internal mixer, and the regenerated rubber sheets are discharged after internal mixing. The mixing temperature is maintained at 60-90°C. The outer end of the feed inlet of the internal mixer is connected with a double auger feeding mechanism to improve the uniformity and efficiency of material transportation. The rotors in the internal mixing chamber are set horizontally and are four in a rectangular distribution. The shearing, squeezing and rubbing intensity of the material increases exponentially. Combined with the wavy shape of the working end surface of the top bolt and press head, the physical properties of the material improve quickly, ensuring that the low-temperature kneading process does not affect or even improve the entire internal kneading process. The working efficiency of the machine, the low-temperature preparation method of recycled rubber involved in the present invention can not only retain the advantage of not affecting the external environment during low-temperature preparation, but also greatly improve the efficiency of low-temperature mixing and the quality of the recycled rubber.

Description

technical field [0001] The invention belongs to the technical field of rubber regeneration, and in particular relates to a method for preparing regenerated rubber at one time at low temperature. Background technique [0002] Regenerated rubber is processed from the vulcanized waste materials in the production of rubber products. It has a certain degree of plasticity and can be reused. Regenerated rubber can partially replace raw rubber for rubber products, which can save raw rubber and carbon. Black is also beneficial to improve processing performance and certain properties of rubber products. [0003] The regeneration process is a process in which waste rubber breaks part of the molecular chains and cross-linking points of vulcanized rubber under the combined action of plasticizers (softeners and activators), oxygen, heat and mechanical shear. Existing regeneration methods include both high-temperature regeneration and low-temperature regeneration. High-temperature regener...

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Problems solved by technology

Existing regeneration methods include both high-temperature regeneration and low-temperature regeneration. High-temperature regeneration is mainly produced by internal mixer, and desulfurized rubber powder is used in high-temperature regeneration, which requires a pre-desulfurization process for waste rubber, and the production efficiency is low. It will also cause external environmental pollution, and vulcanized rubber powder is directly used in low-temperature regeneration, which simplifies the process and does not cause pollution to the outside world. However, the low-temperature regeneration method does not have a special internal mixer and requires multiple processes to complete low-temperature preparation. Long, inefficient, and low-quality final product, so there is a need for improvements to existing methods of reclaiming rubber

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