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Method for desulfurization regeneration of vulcanized rubber by employing double-screw extruder

A twin-screw extruder, vulcanized rubber technology, applied in recycling technology, plastic recycling, etc., can solve the problems of complex equipment, long operation time, large area of ​​​​site, etc., and achieve low cost, homogenization, desulfurization and regeneration, and simple methods. Effect

Active Publication Date: 2011-05-11
QINGWEI RUBBER SUQIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the desulfurization effect of the biological regeneration method is good, this method requires complex equipment, a large area of ​​the site and a long operating time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: with the mixture of 2 parts of coumarone (the said part in the implementation all refers to mass parts), 8 parts of pine tar oil, 4 parts of phenyl mercaptans, 5 parts of n-butylamine, 10 parts of water is regeneration agent, Mix 100 parts of waste vulcanized rubber powder with a particle size of 10 mm in a high-speed mixer (1500 rpm) and regenerant at 100 ° C, and then feed it into the first twin-screw extruder (D = 60, L / D=30, compression ratio=3, all adopt the extruder of this type in the following examples) rotating speed=100 rev / min, pressurization, through forward and backward multi-stage pressure mixing, make the temperature reach 200 ℃, after the pressure reaches 2Mpa, it is directly connected to the second twin-screw extruder (D=50, L / D=30, compression ratio=3) through the machine head sideways, and this type of extruder is used in the following examples Machine) rotating speed=200 rpm, carry out secondary pressurization, heating, reach 250 ℃, pre...

Embodiment 2

[0018] Example 2: Using a mixture of 1 part of coumarone, 10 parts of pine tar, 3 parts of phenylmercaptan, 7 parts of n-butylamine and 5 parts of water as a regenerant, 100 parts of waste vulcanized rubber powder with a particle size of 6 mm , mixed evenly with the regenerant in a high-speed mixer (1500 rpm) at 90°C, and then fed into the first twin-screw extruder (rotational speed = 150 rpm) through a feeding device to pressurize, pass through, Inverse multi-stage pressurized mixing, so that the temperature reaches 220°C and the pressure reaches 2.5Mpa, and then it is directly connected to the second twin-screw extruder (speed = 300 rpm) through the machine head sideways for secondary pressurization and pressurization. temperature to 280°C and pressure to 4Mpa, the prepared desulfurized regenerated rubber has the following properties: tensile strength 18.48MPa, tear strength 35.91KN / m, elongation at break 567.35%, and Mooney viscosity 58.74.

[0019] Original rubber-like pro...

Embodiment 3

[0020] Example 3: Using a mixture of 3 parts of coumarone, 5 parts of pine tar, 1 part of phenylmercaptan, 2 parts of n-butylamine, and 15 parts of water as a regenerant, 100 parts of waste vulcanized rubber powder with a particle size of 1 mm , mixed evenly with the regeneration agent in a high-speed mixer (1500 rpm) at 80°C, and then fed into the first twin-screw extruder (rotational speed = 170 rpm) through a feeding device to pressurize, pass through, Reverse multi-stage pressurized mixing, so that the temperature reaches 230°C, and the pressure reaches 3Mpa, and then it is directly connected to the second twin-screw extruder (screw speed 400 rpm) through the machine head sideways for secondary pressurization and heating , reached 300°C, and the pressure reached 5Mpa, that is, the prepared desulfurized reclaimed rubber had the following properties: tensile strength 16.26MPa, tear strength 30.17KN / m, elongation at break 535.51%, and Mooney viscosity 53.28.

[0021] Original...

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Abstract

The invention relates to a method for desulfurizing and regenerating vulcanized rubber by adopting a twin-screw extruder and pertains to the field of rubber recycling and regeneration. The invention adopts a physical and chemical linking method to regenerate waste vulcanized rubber and utilizes the twin-screw extruder with novel desulfurization regenerant to achieve a high-temperature and high-pressure desulfurization environment under the action of the extruder screw, thus replacing the traditional high-temperature and high-pressure reactor. The invention also helps the regenerant fully penetrate into the waster rubber powder and achieves the high-temperature and high-pressure desulfurization environment, thus disconnecting the cross-linking bond of rubber and achieving the desulfurization and regeneration of rubber.

Description

Technical field: [0001] The invention relates to a method for desulfurizing and recovering vulcanized rubber, in particular to a method for desulfurizing and regenerating vulcanized rubber by using a twin-screw extruder, and belongs to the field of rubber recycling. Background technique: [0002] my country is the largest rubber consumer in the world, and the production of waste rubber ranks first in the world. About 70% of these waste rubbers have renewable value. [0003] As a regeneration process, it can be roughly divided into three categories: chemical regeneration, physical regeneration and biological regeneration. Chemical regeneration is the use of chemical additives, such as organic disulfide (DD), mercaptan, alkali metal, etc., at a certain temperature, with the help of mechanical force to catalyze the cracking of rubber crosslinks, and stabilize the breaking point to achieve the purpose of regeneration. In published literature, (Masaaki Kojima, Mastoshi Tosaka, Y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/10C08L21/00
CPCY02W30/62
Inventor 张立群葛佑勇王士军戴国强李晓林刘力伍社毛
Owner QINGWEI RUBBER SUQIAN
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