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Method for preparing reclaimed rubber by continuous low-temperature high shear

A high-shear, reclaimed rubber technology, applied in plastic recycling, recycling technology and other directions, can solve the problems of low safety factor, poor regeneration performance, discontinuity, etc., to achieve high degree of automation, low cost, and achieve the effect of continuity

Active Publication Date: 2012-12-12
NANJING L J R RUBBE & PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art, such as large pollution, high energy consumption, discontinuity, low safety factor, and poor regeneration performance, and provide a method for continuously preparing reclaimed rubber at low temperature and high shear. Effective desulfurization, depolymerization and regeneration of waste rubber powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Use 100 parts of waste radial tire tread rubber powder with a particle size of 22 meshes, add 10 parts of tall oil and 8 parts of pine tar as softeners, and mix in a high-speed mixer (rotating speed 1000r / min) at 90°C Stir well. Two screw extruders connected in series are used. First, the pretreated waste rubber powder is fed into the first co-rotating twin-screw extruder (D=71mm, L / D=32) through the feeding device, and the screw speed is 250 rpm / Minutes, the screw temperature is set at 10°C, the material is sheared and extruded by the first twin-screw extruder, and then directly connected to the single-screw extruder sideways, (D=150mm, L / D=7), the screw The rotating speed is 60 rpm, and the screw temperature is set at 10°C. The material is further sheared and plasticized in the single-screw extruder, mixed evenly, and then extruded from the die of the single-screw extruder to obtain the required reclaimed rubber. The properties of the obtained reclaimed ...

Embodiment 2

[0026]Example 2: Use 100 parts of waste radial tire tread rubber powder with a particle size of 22 meshes, add 15 parts of coal tar and 5 parts of pine tar as softeners, and mix and stir in a high-speed mixer (rotating speed 1000r / min) at 90°C uniform. Five screw extruders connected in series are used. Firstly, the pretreated waste rubber powder is fed into the first co-rotating twin-screw extruder (D=93mm, L / D=28) through the feeding device, and the screw speed is 250 rpm. Minutes, the screw temperature is set to 50°C, and the material is initially sheared by the first twin-screw extruder and then docked into the second co-rotating twin-screw extruder (D=93mm, L / D=28, built-in reverse To the original screw and mixing elements), the screw speed is 250 rpm, the screw temperature is set to 40 ° C, the material is further subjected to stronger shearing and mixing in the second twin-screw extruder, and then continuously sheared Cut into the third and fourth co-rotating twin-screw...

Embodiment 3

[0028] Example 3: 100 parts of 1 mm waste tire inner tube butyl rubber was used, 5 parts of dipentene was added as a softener, and the mixture was mixed evenly at 120° C. in a high-speed mixer (rotating speed 1500 r / min). Two screw extruders connected in series are used. First, the pretreated waste rubber powder is fed into the first co-rotating twin-screw extruder (D=71mm, L / D=32) through the feeding device, and the screw speed is 300 rpm / Minutes, the screw temperature is set to 100°C, the material is sheared and extruded by the first twin-screw extruder, and then directly connected to the single-screw extruder sideways, (D=150mm, L / D=7), the screw The rotating speed is 65 rpm, and the screw temperature is set at 80°C. The material is further sheared and plasticized in the single-screw extruder, mixed evenly, and then extruded from the die of the single-screw extruder to obtain the required reclaimed rubber. The properties of the obtained reclaimed rubber are as follows: as...

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Abstract

The invention relates to a method for preparing reclaimed rubber by continuous low-temperature high shear and belongs to the field of waste rubber recycling. The preparation method includes that by means of two or more serially connected screw extruders, preprocessed waste rubber powders are subjected to continuous low-temperature high shear actions of a plurality of the screw extruders to crush a three-dimensional cross-linked network of the waste rubber so as to obtain the reclaimed rubber. According to the method for preparing the reclaimed rubber by continuous low-temperature high shear, used devices are the two or more serially connected screw extruders, the technological process is simple, desulfuration temperatures are low, and the method has the advantages of being energy-saving, environment-friendly, continuous and high in stability of product qualities.

Description

technical field [0001] The invention relates to a new method for desulfurization and regeneration of waste rubber, in particular to a new method and process for continuously preparing reclaimed rubber at low temperature and high shear by using multiple serial screw extruders, belonging to the field of waste rubber recycling. Background technique [0002] With the rapid development of the automobile industry, my country's tire-based rubber consumption continues to grow rapidly. At the same time, the production of waste rubber is also increasing. According to statistics, in 2009, my country produced 233 million waste tires, with a weight of about 860. tons. The comprehensive utilization of waste rubber is the core of the circular economy of the rubber industry. It has huge economic and social benefits for saving petrochemical resources, protecting the environment, and alleviating the current situation of my country's high dependence on foreign rubber resources. [0003] The re...

Claims

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Application Information

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IPC IPC(8): C08J11/10C08J11/18C08J11/20C08J11/26C08L17/00C08L23/16C08L23/22
CPCY02W30/62
Inventor 张立群史金炜任冬云邹华张宏生卢希尧丁林林
Owner NANJING L J R RUBBE & PLASTIC CO LTD
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