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Green recycling method of waste rubber

A technology for waste rubber and waste rubber powder, which is applied in the field of waste rubber regeneration, can solve the problems of low sol content, pollute the environment, a large number of toxic and harmful substances, etc., and achieve the effects of high regeneration degree, excellent performance and low regeneration temperature.

Active Publication Date: 2017-12-29
TIANJIN HI TECH ENVIRONMENT DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of rubber softeners are used in this process, and these softeners will produce a large amount of toxic and harmful substances at high temperatures, seriously polluting the environment
At the same time, due to the lack of desulfurization agent, the molecular weight distribution of reclaimed colloidal sol is relatively wide, and its sol content is also low, which affects the value of reprocessing and utilization.

Method used

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  • Green recycling method of waste rubber
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0026] Put the environmentally friendly desulfurizer mixed with di-tert-butyl disulfide and allicin at a mass ratio of 1:2 and 22-mesh waste tire rubber waste rubber powder into a high-speed mixer at a mass ratio of 2:100 and stir for 15 minutes at a temperature of 120 Celsius, then cool the discharge. Then the waste rubber powder is introduced into the first reaction chamber through the screw conveying device, and then supercritical CO with a pressure of 12 MPa is injected into the first reaction chamber, that is, the swelling chamber where the physical reaction takes place. 2 Fluid, keep the temperature at 150°C, turn on the first screw conveying device, convey the waste rubber powder to the discharge end, the conveying time is 25min, the appropriate residence time is to ensure that the environmentally friendly desulfurizer fully penetrates and disperses in the cross-linked three-dimensional network While conveying, the waste rubber powder can be turned over effectively to a...

no. 2 example

[0028] Put 50-mesh waste EPDM waste rubber powder and environmentally friendly desulfurizer diallyl disulfide into a high-speed mixer at a mass ratio of 100:0.5 and stir for 25 minutes at a stirring temperature of 120°C, then cool and discharge. Then the waste rubber powder is introduced into the first reaction chamber through the conveying device, and then supercritical CO with a pressure of 10 MPa is injected into the second reaction chamber. 2 Fluid, keep the temperature at 160°C, turn on the first screw conveying device, and transport the waste rubber powder to the discharge end for 40 minutes. After the pressure is released, the rubber material enters the second reaction chamber, and the second reaction chamber is opened Microwave heating device with a frequency of 955MHz, an intensity of 0.8KW·h / Kg, a heating temperature of 180°C, and a heating time of 5 minutes. After discharging, it is refined into flakes. Among them, the S-S cross-linking bond of the waste rubber powd...

no. 3 example

[0030] Put waste butyl rubber waste rubber powder and desulfurizer di-tert-butyl disulfide into a high-speed mixer at a mass ratio of 100:0.2 and stir for 30 minutes at a stirring temperature of 70°C, then cool and discharge. Then the waste rubber powder is introduced into the first reaction chamber through a screw conveying device, and then supercritical CO with a pressure of 16 MPa is injected into the chamber. 2 Fluid, keep the temperature at 150°C, turn on the first screw conveying device, and transport the waste rubber powder to the discharge end for 5 minutes, after the pressure is released, the waste rubber powder is transferred to the second reaction chamber, and the second reaction chamber is opened The microwave heating device has a frequency of 2400MHz, an intensity of 1.2KW·h / Kg, a heating temperature of 180°C, and a residence time of waste rubber powder in the second reaction chamber of 30min. Under the action, the waste rubber powder is conveyed to the discharge ...

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Abstract

The invention discloses an environment-friendly method for regenerating waste rubber. The method comprises the following steps: 1) uniformly mixing waste rubber and an environment-friendly desulfurizing agent according to a mass ratio of 100:0.2-2; 2) guiding the mixed waste rubber into a first reaction chamber and then fully filling the first reaction chamber with supercritical CO2 fluid; 3) starting a microwave heating device of a second reaction chamber so as to desulfurize waste rubber powder; and 4) after the desulfurization is completed, cooling the waste rubber powder to be below 80 DEG C and refining into pieces after discharging. According to the method, supercritical CO2 fluid which has excellent swelling and permeating characteristics can be used for replacing a rubber softening agent so that a regenerant can permeate and disperse inside the waste rubber powder in a short time and the waste rubber can reach swelling balance; then, microwaves are utilized to selectively damage S-S and C-S cross-linked bonds of the rubber and the desulfurizing agent completely so that a main chain is protected from being damaged to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of recycling waste rubber, in particular to a green recycling method for waste rubber. Background technique [0002] In recent years, with the intensification of global environmental pollution, the increasing scarcity of petroleum resources and the increasing concern of human beings for sustainable development, the recycling of waste rubber, especially waste tires, has become an important issue in the rubber industry. Among them, the use of waste rubber to prepare reclaimed rubber has become an important means. [0003] Rubber regeneration refers to the use of physical, chemical or biological methods to destroy the cross-linked network of rubber to form a linear and reprocessable process. At present, there are mainly three types of rubber regeneration methods: chemical regeneration method, physical regeneration method, and biological regeneration method. At present, the domestic mature reclaimed rubber pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/16C08J11/28
CPCY02P20/54Y02W30/62
Inventor 江宽董大伟李翠红陈俊峰刘力余强
Owner TIANJIN HI TECH ENVIRONMENT DEV CO LTD
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