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Preparation method for light-pyrolysis carbon black

A shallow cracking, carbon black technology, applied in recycling technology, plastic recycling, fibrous fillers, etc., can solve the problems of reduced thermal cracking carbon black performance, poor thermal cracking carbon black performance, and restricting the development of thermal cracking processes. , to reduce equipment wear, facilitate distillation and recovery, and achieve excellent reinforcement performance.

Active Publication Date: 2016-08-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The gas and pyrolysis oil produced by pyrolysis are generally used as fuel, but the pyrolysis carbon black produced has poor performance and has not yet been widely used
Mainly due to the process of thermal cracking of rubber, sulfide and ash (zinc, silicon, calcium, etc. added during rubber processing) will be converted into sulfide (such as ZnS, etc.) and deposited on the surface of carbon black, reducing the performance of thermal cracking carbon black , the utilization value is low, which also limits the development of thermal cracking process
In order to improve the performance of pyrolysis carbon black, the patent CN201410150841.0 proposes a preparation method of oxidatively modified thermal cracking carbon black. Although this method can improve performance, the preparation process is cumbersome and prone to secondary pollution

Method used

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  • Preparation method for light-pyrolysis carbon black
  • Preparation method for light-pyrolysis carbon black
  • Preparation method for light-pyrolysis carbon black

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method for shallow cracking carbon black, comprising the following steps:

[0030] Step 1: Crushing the truck tires to obtain whole tire rubber powder with a particle size of 30 mesh;

[0031] Step 2: Gradually heat the waste rubber powder to 280°C in the double-screw heating conveying device, then enter the screw extruder at 320°C for shallow cracking and extrusion for 2 minutes, and the extruded product enters a water bath to cool down to obtain shallow cracking rubber;

[0032] Step 3: Wrap the shallow lysate rubber with filter paper, put it into a Soxhlet extractor, and extract it with toluene and other solvents for 48 hours;

[0033] Step 4: Take out the filter paper and dry it in an oven at 50°C for 1 hour to obtain lightly cracked carbon black and gel products. Wrap the sample in the filter paper with a 400-mesh copper mesh, put it in toluene solvent and sonicate it for 1 hour, and dissolve the solution Put it in a centrifuge, centrifuge at a speed...

Embodiment 2

[0039] A preparation method for shallow cracking carbon black, comprising the following steps:

[0040] Step 1: Crushing the car tires into rubber particles with a size of 5-15 mesh, and further grinding them into rubber powder with a size of 20-80 mesh;

[0041] Step 2: Gradually heat the waste rubber powder to 240°C in the double-screw heating conveying device, then enter the screw extruder to heat up to 270°C for shallow cracking, and the extruded product is cooled in a water bath and extruded for 2 minutes;

[0042]Step 3: Wrap the shallow lysate rubber with filter paper, put it into a Soxhlet extractor, and extract it with a solvent for 24 hours;

[0043] Step 4: Take out the filter paper and dry it in an oven at 60°C for 0.5h to obtain shallow pyrolysis carbon black and gel products. Wrap the sample in the filter paper with a 400-mesh copper mesh and put it in toluene solvent for 0.5h. Put the solution into a centrifuge, centrifuge at a speed of 7000rpm for 30min, colle...

Embodiment 3

[0048] A preparation method for shallow cracking carbon black, comprising the following steps:

[0049] Step 1: Crushing the car tires into rubber particles with a size of 5-15 mesh, and further grinding them into rubber powder with a size of 20-80 mesh;

[0050] Step 2: Gradually heat the waste rubber powder to 280°C in the double-screw heating conveying device, and then enter the screw extruder at a temperature of 350°C for shallow cracking and extruding. The extruded product enters a water bath to cool, and the extrusion time is 2 minutes;

[0051] Step 3: Wrap the shallow lysate rubber with filter paper, put it into a Soxhlet extractor, and extract it with a solvent for 36 hours;

[0052] Step 4: Take out the filter paper and dry it in an oven at 60°C for 1 hour to obtain shallow pyrolysis carbon black and gel products. Wrap the sample in the filter paper with a 400-mesh copper mesh, put it in gasoline and ultrasonically for 0.5 hours, and dissolve the solution Put it in ...

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Abstract

The invention relates to a preparation method for light-pyrolysis carbon black. The method comprises the following steps: 1) subjecting waste rubber to light pyrolysis in a combined extruding apparatus composed of a screw with a temperature in a range of room temperature to 280 DEG C and a screw rod with a temperature in a range of 280 DEG C to 350 DEG C; 2) subjecting pyrolysis products to dissolving, extracting and separating with solvents; and 3) carrying out crushing and drying on a residual product obtained after extraction so as to obtain light-pyrolysis carbon black, wherein the surface of the obtained light-pyrolysis carbon black has bonding glue and zinc oxide, and the carbon black can form high-content bonding glue with novel rubber. Compared with the prior art, the preparation method is environment-friendly; the obtained carbon black can be perfectly bonded with rubber and has excellent reinforcing performance; and the method is a novel method for recovery and high-added-value utilization of waste rubber.

Description

technical field [0001] The invention relates to a method for recovering and reusing waste rubber with high added value, in particular to a method for separating superficially pyrolyzed carbon black with excellent reinforcing performance by dissolving and extracting superficially pyrolyzed waste rubber. Background technique [0002] The rational treatment of waste tires is an important issue for the sustainable development of the national economy. The main treatment methods include: tire retreading, grinding rubber powder, landfill, thermal cracking and other methods, among which thermal cracking is the most economical and environmentally friendly method. one. Pyrolysis is to heat the waste tire rubber to above 400°C, conduct heat treatment, and decompose it into gas, pyrolysis oil, and pyrolysis carbon black. [0003] The gas and pyrolysis oil produced by pyrolysis are generally used as fuel, but the pyrolysis carbon black produced has poor performance and has not been wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/48C08J11/10
CPCC08J11/10C09C1/482Y02W30/62
Inventor 王仕峰李硕吴晓羽
Owner SHANGHAI JIAO TONG UNIV
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