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Method for desulphurization, disaggregation and regeneration of vulcanized rubber

A technology of vulcanized rubber and vulcanized rubber powder, which is applied in the field of desulfurization, depolymerization and regeneration of vulcanized rubber, which can solve the problems of high risk, slow speed, and complicated operation process, and achieve the effects of full utilization, reduced energy consumption, and reduced environmental pollution

Active Publication Date: 2009-08-12
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the supercritical condition is obtained by pumping the liquid carbon dioxide stored in the high-pressure steel cylinder into the autoclave through a liquid high-pressure pump. This process requires high-pressure equipment, high cost, high risk, complicated operation process, and slow speed; The depolymerization of rubber is not complete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: The waste tire rubber powder with a particle size of 60-80 mesh was removed by Soxhlet extraction to remove small molecular substances such as carbon black and fillers, placed in a high-pressure reactor, and diphenyl disulfide (DD) was used as the desulfurization agent. Reagent, replace the air in the reactor with carbon dioxide gas and add dry ice to make the carbon dioxide density in the reactor 0.466g / cm 3 , to ensure that the carbon dioxide in the kettle is in a supercritical state. Gradually raise the temperature to 150°C (the heating rate is 4°C / min), and keep at this temperature for 60min. After the reactor is naturally cooled to room temperature, the carbon dioxide in it is slowly released to obtain a swelling glue. Take out the swollen rubber dispersed with the desulfurization agent, knead it on a hot roller at 140°C for 10 minutes, make the desulfurization agent react with the sulfur in the vulcanized rubber molecules, break the network structure o...

Embodiment 2

[0017] Example 2: The waste tire rubber powder with a particle size of 60-80 mesh was removed by Soxhlet extraction to remove small molecular substances such as carbon black and fillers, placed in a high-pressure reactor, and diphenyl disulfide (DD) was used as the desulfurization agent. Reagent, replace the air in the reactor with carbon dioxide gas and add dry ice to make the carbon dioxide density in the reactor 0.472g / cm 3 , to ensure that the carbon dioxide in the kettle is in a supercritical state. Gradually raise the temperature to 160°C (the heating rate is 4°C / min), and keep at this temperature for 45min. After the reactor is naturally cooled to room temperature, the carbon dioxide in it is slowly released to obtain a swelling gel. Take out the swollen rubber dispersed with the desulfurization agent, and bake it in a vacuum oven at 160°C for 60 minutes, so that the desulfurization agent reacts with the sulfur in the vulcanized rubber molecules, breaks the network str...

Embodiment 3

[0019] Example 3: The waste tire rubber powder with a particle size of 60-80 mesh was removed by Soxhlet extraction to remove small molecular substances such as carbon black and fillers, placed in a high-pressure reactor, and diphenyl disulfide (DD) was used as the desulfurization agent. Reagent, replace the air in the reaction kettle with carbon dioxide gas and add dry ice to make the carbon dioxide density in the kettle 0.6g / cm 3, so as to ensure that the carbon dioxide in the kettle is in a supercritical state. Gradually raise the temperature to 170°C (the heating rate is 4°C / min), and keep at this temperature for 30min. After the heat preservation is over, the reaction kettle is naturally cooled to room temperature, and then the carbon dioxide in it is slowly released to obtain a swelling gel. Take out the swollen rubber dispersed with the desulfurization reagent, press on a flat vulcanizer at 160°C for 40 minutes to make the desulfurization reagent react with the sulfur ...

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PUM

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Abstract

The invention relates to a method for vulcanized rubber regeneration by desulfurization and depolymerization, and belongs to the rubber cyclic regeneration field. The method comprises the following steps: first obtaining supercritical carbon dioxide by adding dry ice in a high pressure reaction kettle in safe and rapid manner, realizing rapid pollution-free permeation of desulfurization reagent into the rubber by the supercritical CO2, then breaking cross bonds of the rubber by cooperation of mechanical shearing, temperature and the desulfurization agent so as to realize desulfurization and regeneration of the rubber. The regenerated rubber has the advantages of safety, rapid performance, low energy consumption, no pollution, and good recycling effect.

Description

Technical field: [0001] The invention relates to a method for desulfurization, depolymerization and regeneration of vulcanized rubber, belonging to the field of rubber recycling. Background technique: [0002] In the past two decades, with the intensification of global environmental pollution, lack of energy and the public's increasing concern for environmental protection and sustainable human development, the recycling of waste rubber products, especially automobile tires, has become very important in the rubber industry. one of the subjects. [0003] Rubber regeneration methods can be roughly divided into three categories: physical regeneration, chemical regeneration and biological regeneration. Physical regeneration is the use of external energy, such as force, heat-force, cold-force, microwave, ultrasonic, ray energy, etc., to break the three-dimensional network of cross-linked rubber and form a fluid regenerated rubber. The physical regeneration method has high energy...

Claims

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Application Information

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IPC IPC(8): C08J11/28C08L21/00
CPCY02P20/54Y02W30/62
Inventor 张立群葛佑勇李晓林伍社毛王士军戴国强
Owner BEIJING UNIV OF CHEM TECH
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