Method for inducing desulfurization reaction of vulcanized rubber powder through stress of subcritical water extrusion method

A technology of vulcanized rubber powder and subcritical water, applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of solid polymer without shearing, mixing and surface renewal, discontinuous process, high temperature, pressure and other problems , to achieve the effect of easy automation, improved mechanical properties, and improved fluidity

Active Publication Date: 2013-05-01
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, super / subcritical fluid reaction technology generally needs to be carried out in batch tank reactors. The process is discontinuous, requires high temperature and pressure, and the energy consumption of the reaction is high. The solid polymer participating in the reaction cannot be effectively recovered. Shearing, mixing and surface renewal effects
Therefore, generally only monomer or fuel oil can be recycled

Method used

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  • Method for inducing desulfurization reaction of vulcanized rubber powder through stress of subcritical water extrusion method
  • Method for inducing desulfurization reaction of vulcanized rubber powder through stress of subcritical water extrusion method
  • Method for inducing desulfurization reaction of vulcanized rubber powder through stress of subcritical water extrusion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: The rubber powder is mainly composed of leftovers in the production process of car tires. It is determined that it is mainly 80 mesh SBR-based tire rubber powder, provided by Yangzhou Lvhuan Rubber Co., Ltd. According to the thermogravimetric analysis of the rubber powder, the composition of the rubber powder is as follows: volatile matter accounts for 5.5%, rubber content accounts for 46.7%, carbon black content accounts for 37.2% and ash content accounts for 10.5%.

[0043] Mix 800 grams of the above tire rubber powder with 200 grams of EPDM4770 (sub-brand, DuPont-Dow, USA) and 30 grams of distilled water; add the mixture to a third-order co-rotating screw with a diameter of 35 mm and an aspect ratio of 44. In the rotary twin-screw extruder (Nanjing Coperion-Keya Machinery Equipment Co., Ltd.); the extrusion temperature is controlled at 180°C, 200°C and 220°C, and the screw speed is 400rpm, 600rpm, 800rpm, 1000rpm, 1200rpm; Water is metered and injected at ...

Embodiment 2

[0052] Embodiment 2: Mix 800 grams of the above-mentioned tire rubber powder with 200 grams of EPDM4770 (sub-brand, DuPont-Dow Company of the United States), 30 grams of distilled water and 0.3% desulfurization accelerator: hydrogen peroxide H 2 o 2 , alkylphenol polysulfide 450 or H 2 o 2 Mixed with the compound of 450; the mixture was added to the twin-screw extruder; the extrusion temperature was controlled at 200°C, the pressure was 1.6MPa, and the screw speed was 400rpm, 600rpm, 800rpm, 1000rpm, and 1200rpm; others were the same as in Example 1 Same, the gel content and Mooney viscosity value of the obtained desulfurization product refer to Figure 7 and Figure 8 .

Embodiment 3

[0058] Embodiment three: the above-mentioned SBR-based tire rubber powder is mixed with HDPE at a mass ratio of 70:30, and 1.5% desulfurization accelerator is added. After the materials are mixed evenly, melt extrusion desulfurization reaction is carried out in a twin-screw extruder. At the same time as the reaction, turn on the metering pump to inject an appropriate amount of water into the extruder through the water injection port B to form a subcritical state of water. The extrusion temperature is 220°C, the subcritical water pressure is 2.4MPa, and the screw speed is 1000rpm. In this state, the extrusion desulfurization reaction of tire rubber powder is carried out. The volatile gas generated during the extrusion reaction process was removed by a vacuum system, and the extruded product was water-cooled and pelletized to obtain a desulfurized blend (DGTR / HDPE), and the desulfurized blend was dried in a vacuum oven at 80°C for 6 hours.

[0059] Mix 60 parts (parts by mass, t...

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Abstract

The invention relates to a technology for inducing a desulfurization reaction of vulcanized rubber powder through compounding subcritical water extrusion and high shearing stress, that is, according to the percentage content of the total mass of reaction materials, 0-30% of linear high molecular material, 65-97% of waste rubber powder and 0.2-5% of desulfurization auxiliary agent are mixed; the mixture is molten and extruded for desulfurizing in a double-screw extruder, wherein the double-screw extruder has subcritical water extraction reaction conditions and higher screw rotating speed; and the reaction product is cooled by water, extruded to strips and dried, or is calendered by a roller, cooled and extruded to sheets so as to obtain a regenerative rubber material after the desulfurization reaction. The method is a further improvement based on the original method for inducing desulfurization and modification through high shearing stress of waste tire rubber powder. The method further improves the efficiency of the desulfurization reaction, is easy to control the reaction process, generates no harmful gases, and has the advantages of high yield, low energy consumption, easiness in upsizing and scale production, low environmental pollution, and high mechanical performance of desulfurization products and resulfurization materials.

Description

Technical field: [0001] The present invention is a further improvement on the basis of the original waste tire rubber powder high shear stress induced desulfurization and modification method. The melt extruding desulfurization reaction carried out in the extruder belongs to the research field of extrusion reaction engineering and macromolecular material mechanochemical reaction. technical background: [0002] The scientific recycling of waste polymer materials is a major issue faced by human beings since entering the 21st century. According to statistics, by 2004 the world's plastic output had reached 2.12 tons, the annual output of rubber had reached 20 million tons, and the output of synthetic fibers had reached 60.8 million tons, and the annual growth rates were 5%, 4.9% and 14% respectively. growth of. Due to the limitation of the product's service life, the amount of polymer materials that are discarded each year along with the product's end-of-life is extremely huge,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/10C08J11/28C08J11/24C08J11/22C08L9/06C08L23/16C08L23/06C08L7/00C08K13/02C08K3/04C08K3/06C08K3/22
CPCY02W30/62
Inventor 张云灿武懿嘉史长平怀乐沈韦韦王小军张玲
Owner NANJING UNIV OF TECH
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