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Process for waste and old tyre rubber stress induced desulphurization reaction

A waste tire rubber and process technology, which is applied in the field of improved stress-induced desulfurization reaction of waste tire rubber, can solve the problems of the reduction of the tensile strength of the revulcanized material, the influence of the performance of the reclaimed rubber material, the breakage of the molecular main chain, etc., so as to improve the selectivity Probability of fracture, automated desulfurization production, effect of modified compatibility properties

Inactive Publication Date: 2010-09-01
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to improve the problems existing in the existing desulfurization method, which may cause too many molecular main chain breaks and decrease in the tensile strength of the revulcanized material, which affects the further improvement of the performance of the reclaimed rubber material, and there are more vulcanization during the desulfurization process. The discharge of harmful gases such as hydrogen and sulfur dioxide affects the operating environment and causes corrosion to equipment. An improved stress-induced desulfurization process for waste tire rubber is proposed.

Method used

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  • Process for waste and old tyre rubber stress induced desulphurization reaction
  • Process for waste and old tyre rubber stress induced desulphurization reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 (desulfurization reaction of tire rubber powder using sec-butanol as accelerator and performance of blended SBR rubber), tire rubber powder (GTR) 20 mesh, provided by Jiangsu Tongjiang Plastic Co., Ltd., obtained through thermogravimetric analysis: rubber content The carbon black content is 42.9%, the carbon black content is 33.2%, the ash content is 18.3%, and the volatile content is 5.6%.

[0033] Mix 800 grams of above-mentioned tire rubber powder with 200 grams of EPDM (NDR4770 U.S. Dupont-Taoshi company product), 50 grams of sec-butanol, 2 grams of antioxidant 1010 and 1.5 grams of calcium stearate; In a three-stage co-rotating twin-screw extruder with an aspect ratio of 35mm and an aspect ratio of 45 (manufactured by Nanjing Keya Machinery Equipment Co., Ltd., please refer to the attached drawing for the extrusion process and screw combination diagram of the extrusion device. figure 1 And attached figure 2 ); control the extrusion reaction temperature ...

Embodiment 2

[0058] Embodiment 2 (select car tire tread rubber powder and use sec-butanol as the desulfurization reaction of tire rubber powder as desulfurization accelerator and the properties of blended SBR rubber): the tire rubber powder is changed to Yangzhou Lvhuan Waste Rubber Recycling Co., Ltd. The provided 10 mesh car tire tread rubber powder (GTR) is obtained through thermogravimetric analysis: the rubber content is 46.8%, the carbon black content is 33.8%, the ash content is 12.1%, and the volatile matter content is 7.3%. Others are the same as in Example 1. The gel content of the obtained desulfurized tire rubber product is 29.3%, the tensile strength of the vulcanized rubber sheet is 18.5MPa, the elongation at break is 887.6%, the tear strength is 94.8kN / m, and the Shore A hardness is 62.

[0059] The gel content of the product of Example 2 is 29.3% obviously lower than the gel content of 40.7% of the product of Example 1, indicating that the cross-linking density of the car t...

Embodiment 3

[0065] Embodiment 3 (select car tire tread rubber powder and adopt tert-butanol as desulfurization accelerator tire rubber desulfurization reaction and blending SBR rubber performance): the desulfurization reaction accelerator is changed from sec-butanol to tert-butanol, Others are the same as in Example 2. The gel content of the obtained desulfurized tire rubber product is 32.6%, the tensile strength of the vulcanized rubber sheet is 16.1MPa, the elongation at break is 864.5%, the tear strength is 86.7kN / m, and the Shore A hardness is 60.

[0066] By fixing the extrusion reaction temperature and changing the screw speed, the comparative data of Example 3 under different screw speed conditions can be obtained as shown in table 6:

[0067]Table 6 The effect of screw speed on the properties of DGTR / EPDM and the mechanical properties of SBR / (DGTR / EPDM) vulcanized blends

[0068]

[0069] *The desulfurization reaction temperature is 240°C, and the desulfurization accelerator i...

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Abstract

The invention relates to a process for waste and old tyre rubber stress induced desulphurization reaction, which comprises the following steps of: mixing linear macromolecular substance, waste and old tyre rubber powder, stabilizing aid and desulphurization promoter; adding the mixture into a homodromous double-screw extruder with high rotational speed and high shear, performing fusion extruding desulphurization reaction, and water-cooling, granulating and drying or roller-calendaring, cooling and slicing a reaction product to obtain a desulphurized and modified reclaimed rubber product. Because the desulphurization reaction and the coarse smelting, refining and rubber-filtering processes of the reaction product are integrated together, the process has the advantages of high desulphurization process efficiency, high yield, low energy consumption, easy large-scale production and easily controlled desulphurization reaction process; and the desulphurization promoter can accelerate the desulphurization reaction and play a role in protecting main chains and double bonds of desulphurization product molecules so as to improve the probability of selective breakage of S-S bonds in a tyre rubber crosslinking network. The reaction process has little environment pollution, and the desulphurization product has good mechanical property due to the blending of butadiene styrene rubber re-vulcanizing material.

Description

Technical field: [0001] The invention relates to an improved stress-induced desulfurization process of waste tire rubber, which belongs to the field of modification of polymer materials. Background technique: [0002] According to statistics, the current annual output of automobile tires in the world is between 1.5 billion and 2 billion, which is equivalent to the number of scrap tires scrapped every year. In recent years, due to the rapid development of the automobile industry, the production and consumption of tires in my country has shown a rapid growth trend. In 2006, the total output of tires in my country was about 433 million, a year-on-year increase of 15%; in 2007, it was 557 million, a year-on-year increase of 23%. After the balance of import and export, the domestic demand has reached at least 300 million pieces. Based on an average renewal rate of 70%, the output of waste tires has reached more than 200 million pieces, ranking second in the world. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/18C08J11/24C08J11/28C08L21/00C08L23/06C08L23/12C08L53/00C08L23/16C08L23/08C08L53/02C08L9/06C08L9/00C08L7/00B29C47/40B29C48/57B29C48/40
CPCB29C47/6056B29C48/57B29C48/40
Inventor 张云灿闫标孟亚男司虎丁骋马大千朱慧
Owner NANJING UNIV OF TECH
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