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
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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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