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Method for preparing environmentally friendly reclaimed rubber by two-stage desulfurization

A reclaimed rubber, environmental protection technology, applied in the direction of recycling technology, plastic recycling, etc., can solve the problems of poor mechanical properties such as tensile strength, large damage degree of rubber carbon chain, and small damage degree of rubber carbon chain, etc., to achieve tensile strength Good mechanical properties, good processing performance, and less environmental pollution

Inactive Publication Date: 2018-02-06
XUZHOU COLLEGE OF INDAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the reclaimed rubber produced in the society adopts a one-stage desulfurization method, that is, "high-temperature desulfurization" is carried out at 180-230°C under heat preservation and pressure-holding conditions. According to the existing public technical documents, high-temperature desulfurization is performed. There are many types of desulfurization agents and activators, which can greatly damage the rubber carbon chain, and the produced reclaimed rubber has poor mechanical properties such as tensile strength; using "low temperature desulfurization" at 50-100 °C, the process is mainly Using an open mill and a low-temperature desulfurization regenerant to refine for a certain period of time or a number of times, this method of mechanically desulfurizing the reclaimed rubber produced has little damage to the rubber carbon chain, but the Mooney viscosity is high and the process is difficult. Poor performance, the problems caused by the two desulfurization methods have been plagued by the development of the rubber reclaimed rubber industry

Method used

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  • Method for preparing environmentally friendly reclaimed rubber by two-stage desulfurization
  • Method for preparing environmentally friendly reclaimed rubber by two-stage desulfurization
  • Method for preparing environmentally friendly reclaimed rubber by two-stage desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The waste rubber powder selected is the rubber powder of the carcass rubber of the waste radial tire.

[0019] One-stage high-temperature desulfurization: add 100 parts of 28-mesh tire rubber powder; 1 part of activator 450; 220°C, pressure 2.1MPa, heat desulfurization for 120min, turn off the heating power, do not keep warm, directly exhaust and relieve pressure, stop stirring, open the tank door, discharge, cool to about 50°C, and obtain a section of high-temperature desulfurization reclaimed rubber.

[0020] Two-stage low-temperature desulfurization: introduce the reclaimed rubber that has been desulfurized at a high temperature and cooled to about 50°C into the mixer, add 1 part of low-temperature desulfurization regenerant RV rubber regenerant, stir for 10 minutes, and then introduce it into the rubber double-roller mill. For 30 minutes, the thin pass conditions are roll temperature 50°C, roll distance 0.1 mm, and the second-stage desulfurization environmentally fr...

Embodiment 2

[0023] The waste rubber powder selected is the rubber powder of the carcass rubber of the waste radial tire.

[0024] One-stage high-temperature desulfurization: add 100 parts of 28-mesh tire rubber powder; 1.5 parts of activator 450; 1.5 parts of rosin; 30 parts of tap water into the desulfurization tank, stir and heat at a stirring speed of 30 rpm, and heat up the material gradually To 210°C, pressure 1.85MPa, heat and desulfurize for 105min, turn off the heating power, do not keep warm, directly exhaust the pressure, stop stirring, open the tank door, discharge the material, cool to about 50°C, and obtain a section of high-temperature desulfurized reclaimed rubber.

[0025] Two-stage low-temperature desulfurization: introduce the reclaimed rubber that has been desulfurized at a high temperature and cooled to about 50°C into the mixer, add 1.5 parts of low-temperature desulfurization regenerant RV rubber regenerant, stir for 25 minutes, and then introduce it into the rubber m...

Embodiment 3

[0028] The waste rubber powder selected is the rubber powder of the carcass rubber of the waste radial tire.

[0029] One-stage high-temperature desulfurization: 100 parts of 28-mesh tire rubber powder; 2 parts of activator 450; 2 parts of rosin; 200°C, pressure 1.7MPa, heat desulfurization for 90 minutes, turn off the heating power, do not keep warm, directly exhaust and relieve pressure, stop stirring, open the tank door, discharge, cool to about 50°C, and obtain a section of high-temperature desulfurization reclaimed rubber.

[0030] Two-stage low-temperature desulfurization: introduce the reclaimed rubber that has undergone high-temperature desulfurization and cooled to about 50°C into the mixer, add 2 parts of low-temperature desulfurization regenerant RV rubber regenerant, stir for 30 minutes, and then introduce it into the rubber double-roller mill. For 15 minutes, the thin pass conditions are roll temperature 80°C, roll distance 0.3 mm, and the second-stage desulfuriza...

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Abstract

The invention discloses a method for preparing environment-friendly reclaimed rubber through two-stage desulfurization, belonging to the technical field of reclaimed rubber. The reclaimed rubber comprises the following raw materials in parts by weight: 100 parts of waste rubber powder, 1-2 parts of high-temperature desulfurization activating agent, 1-2 parts of low-temperature desulfurization reclaiming agent, 1-2 parts of rosin and 25-35 parts of tap water, wherein the waste rubber powder is tire rubber powder. The method comprises the steps of first-stage high-temperature desulfurization in a desulfurization tank and second-stage low-temperature desulfurization in an agitator and an open mill. The reclaimed rubber produced by utilizing the method provided by the invention has good mechanical properties, such as tensile strength, low Mooney viscosity and good processability. The processing method is environment-friendly.

Description

technical field [0001] The invention relates to a technology for preparing reclaimed rubber from waste rubber, in particular to a method for preparing environmentally friendly reclaimed rubber through two-stage desulfurization. Background technique [0002] A large number of automobile tires are scrapped in my country every year. Most of these rubber products are discarded, causing large-scale pollution to soil and water sources. Waste tires, rubber soles and other waste rubber can be reused as renewable resources. At present, most of the reclaimed rubber produced in the society adopts a one-stage desulfurization method, that is, "high-temperature desulfurization" is carried out at 180-230°C under heat preservation and pressure-holding conditions. According to the existing public technical documents, high-temperature desulfurization is performed. There are many types of desulfurization agents and activators, which can greatly damage the rubber carbon chain, and the produced ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/28
CPCY02W30/62
Inventor 朱信明孙鹏朱贺丛后罗杨枫周洪
Owner XUZHOU COLLEGE OF INDAL TECH
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