Method for subcritical alcohol extrusion stress induced devulcanization of vulcanized rubber powder

A technology of vulcanized rubber powder and extrusion stress, applied in recycling technology, plastic recycling, etc., can solve the problems affecting the mechanical properties of re-vulcanized materials in the desulfurization reaction and the rupture of the main chain of rubber molecules, so as to reduce the probability of rupture and improve the flow rate. the effect of improving mechanical properties

Inactive Publication Date: 2014-06-04
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the subcritical water has a strong oxidizing ability, and the main chain of the rubber molecule is severely broken during the desulfurization process, which still affects the efficiency of the desulfurization reaction and the mechanical properties of the re-vulcanized material.

Method used

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  • Method for subcritical alcohol extrusion stress induced devulcanization of vulcanized rubber powder
  • Method for subcritical alcohol extrusion stress induced devulcanization of vulcanized rubber powder
  • Method for subcritical alcohol extrusion stress induced devulcanization of vulcanized rubber powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: The rubber powder is mainly composed of natural (NR)-based tire rubber, the fineness of the rubber powder is 30-40 mesh, and it is provided by Jiangyin Anqiang High Wear-resistant Rubber Co., Ltd. According to the thermogravimetric analysis, it can be known that the composition of rubber powder is: 4.9% volatile matter, 55.9% rubber content, 29.7% carbon black content and 9.5% ash content.

[0050]Mix 800 grams of the above rubber powder with 200 grams of EPDM4770 (sub-brand, DuPont-Dow, USA), 4503 grams of alkylphenol polysulfide and 30 grams of methanol, ethanol or propanol, and add the mixture together with a screw diameter of 35mm , in a three-stage co-rotating twin-screw extruder with an aspect ratio of 44 (Nanjing Coperion-Keya Machinery Equipment Co., Ltd., for the extrusion process and screw combination diagram of the extrusion device, see the attached figure 1 , attached figure 2 ); the extrusion reaction temperature is 180°C, and the screw speeds ...

Embodiment 2

[0070] Example 2: The rubber powder is mainly composed of leftovers in the production process of car tires, which 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%.

[0071] Mix 800 grams of the above tire rubber powder with 200 grams of EPDM4770 and 45,010 grams of alkylphenol polysulfides. At the same time, choose to test the three schemes of not adding alcohol, adding 3% ethanol or adding 3% propanol. After the mixture is evenly mixed, add Into a three-stage co-rotating twin-screw extruder with a screw diameter of 35mm and a length-to-diameter ratio of 44 (Nanjing Coperion-Keya Machinery Equipment Co., Ltd., please refer to the attached picture for the extrusion process and ...

Embodiment 3

[0080] Example 3: EPDM waste rubber powder (WEPR) (the leftovers produced by the factory, about 30 meshes), Jiangyin Haida Rubber & Plastic Co., Ltd., rubber powder composition: From thermogravimetric analysis, it can be known that the rubber powder composition is: volatile matter accounts for 8.4% , Rubber content accounts for 32.7%, carbon black content accounts for 28.6% and ash content accounts for 30.3%.

[0081] Mix 800g of EPDM waste rubber powder (WEPR) with 200g of EPDM4770, add about 3% of water, ethanol-water mixture (mixing ratio 3:7) or propanol, mix well, and add the mixture together. The diameter of the screw is 35mm, and the length In a three-stage co-rotating twin-screw extruder with a diameter ratio of 44 (Nanjing Coperion-Keya Machinery Equipment Co., Ltd., the extrusion process and the screw combination diagram of the extrusion device refer to the attached figure 1 and attached figure 2 ); the extrusion reaction temperature is 220°C, the pressure of subcr...

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Abstract

The invention relates to a method for subcritical alcohol extrusion stress induced devulcanization of vulcanized rubber powder. The method comprises the following steps: mixing a linear high polymer material accounting for 0 to 30% of the total mass of reactants, waste rubber powder accounting for 65 to 97% of the total mass of the reactants and a devulcanization auxiliary agent accounting for 0.2 to 5% of the total mass of the reactants and subjecting the obtained mixture to a melt extrusion devulcanization reaction in a double-screw extruder with subcritical alcohol extrusion reaction conditions and a high screw speed; and subjecting the reactants to water cooling, striping and drying or to roller calendaring, cooling and sheet formation so as to obtain a devulcanized reclaimed rubber material. According to the invention, the method is an improvement to a conventional method for devulcanization of vulcanized rubber powder under subcritical water extrusion composite induction; solubility and permeability of a devulcanization promoter and the reaction mixture are improved, selectivity of cross bond rupture in devulcanization is further improved, and devulcanization efficiency is improved; reaction process is easy to control, no obvious harmful gas is produced, high yield and low energy consumption are realized, large-scale production of the method can be easily carried out, small pollution is posed to the environment, and a devulcanization product re-vulcanized material has high mechanical properties.

Description

Technical field: [0001] The present invention is a further improvement on the basis of the original subcritical water extrusion stress-induced vulcanized rubber powder desulfurization reaction method, that is, in a co-rotating twin-screw extruder with subcritical alcohol reaction conditions and a certain screw speed The melt extrusion desulfurization reaction carried out, that is, a method for inducing the desulfurization reaction of vulcanized rubber powder by subcritical alcohol extrusion stress, belongs to the field of extrusion reaction engineering and mechanochemical reaction research of polymer materials. technical background: [0002] Since Charles Goodyear invented sulfur vulcanized natural rubber in the middle of the 19th century, the rubber industry in the world has developed by leaps and bounds. The vulcanized rubber material has excellent tensile strength, elasticity, durability and solvent resistance, so it is widely used and involves every aspect of people's li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08J11/28
CPCY02W30/62
Inventor 张云灿沈韦韦武懿嘉王小军
Owner NANJING UNIV OF TECH
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