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【答案】应助回帖
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sltmac: 金币+2 2012-05-09 08:54:13
高卢oo: 金币+200, 翻译EPI+1, ★有帮助, 翻译的工作量蛮大 虽然效果较我预计有一定差距 还是谢谢 2012-05-09 22:35:57
看楼主够诚意，花了一个多小时翻译了一下，仅供参考，非机械力化学专业，但曾经翻阅过双螺杆挤出的资料。翻译的不好，您再找同行多改改吧。
During the melting extrusion process for the powder of waste tire rubber, a high shear stress induced effects could be obtained by increasing the screw speed of Twin-screw extruder. On the one hand, the effects of the screw speed, extrusion reaction temperature and desulfurization accelerator varieties on the melt flow rate of the tire rubber desulfurization blends, gel content, infrared absorption spectra of the sol were systematically investigated. On the other hand, the dynamic mechanical properties of the dynamically Vulcanized Thermoplastic Elastomer-Desulfurization Tire Glue (DGTR) / High Density Polyethylene (HDPE) / Ethylene Propylene Diene Monomer (EPDM) rubber and its preparation conditions were examined. Besides, the effects of subcritical water combined with high shear stress on the stress-induced desulfurization for tire rubber was also included. The following conclusions could be made:
(1) During the melting extrusion process for the mixture of the tire crumb rubber and HDPE, the desulfurization reaction could be induced by high shear stress inside. In fact, the high-speed shearing in twin-screw extruder can induce waste tire rubber mixture reconciliation crosslinking reaction and chain scissions in network, causing the decline of the gel content of melting desulfurization blends, decrease of particle sizes of solid and increase of the melt flow rate. The faster the extruder screws speed, higher the extrusion reaction temperature and reconciliation rates of this broken crosslinking chain;
(2) During the desulfurization reaction induced by high shear stress in the tire crumb rubber and HDPE melt extrusion process, the promotion agent butanol, multi-alkyl phenol disulfide (420 or 450) and n-butylamine significantly improved the desulfurization reaction. This caused a significant increase in styrene-butadiene rubber content in the desulfurization reaction products sol. 450 or n-butylamine accelerator are considered better due to greater desulfurization effects, which decreased the gel content for the desulfurization products, while increased the melt flow rate. In this way, mechanical performance of the dynamically crosslinked thermoplastic elastomer was significantly improved.
(3) In the preparation process of thermoplastic elastomer DGTR/HDPE/EPDM by using cross-linking desulfurization blends and the EPDM, the DCP-based crosslinking agent was selected, and S was used as the secondary cross-linking agent. In this way, the dynamic crosslinking system was found to be the best.
(4) During the desulfurization reactions, in which n-butylamine was used as the accelerator with the reaction conditions (240 °C and 1000 r/min), the gel content of desulfurization blends after the desulfurization reaction induced by high shear stress could arrive at 26.1% and the melting body flow rate could go up to 9.2g/10min. During the Dynamically vulcanized process, the 2phr DCP with 0.5phr S crosslinked system was selected, based on which the curing time should be 10 minutes to obtain a better mechanical properties. Under these conditions, tensile strength and fracture elongation of dynamically vulcanized thermoplastic elastomer DGTR/HDPE/EPDM (40/40/20) was tested as 12.5MPa and 440.6 %, respectively.
(5) Subcritical water extrusion method was used in stress-induced desulfurization reaction for waste tire rubber, in which the technique of high shear stress induced decomposition cross-linking reaction and subcritical fluid decomposition was combined to reduce the cross-linked bond rupture activation energy due to synergistic effects. In fact, this could improve the efficiency of cross-linked network fracture, resulting in better desulfurization output.
(6) During the process of the stress induced desulfurization reaction of the scrap tire rubber powder and HDPE melt by the sub-critical water extrusion method, the faster the extruder screw speed, the higher extrusion reaction temperature and the greater the pressure of subcritical water. In this way, the tire crumb rubber cross-linked network by mechanical shear stress and thermal effect is stronger, and subcritical water dissolved reconciliation of tire rubber cross-linked network crosslinking reaction effect is also significantly enhanced. After the synergy of these two solutions cross-linking reaction, caused by desulfurization blends of the decline of the gel content and increase of the melt flow rate, the double bond in the desulfurization blends Sol characteristic absorption peak intensity was increased significantly. At the same time, of the mechanical properties of thermoplastic elastomer material was significantly improved.
(7) In stress-induced desulfurization reaction process for scrap tire rubber powder and HDPE melts, the subcritical water extrusion method was used and n-butylamine was selected as the accelerator of the desulfurization, which significantly decreased the gel content, and increased flow rate of the melt gel. The particle size of the dynamically crosslinked thermoplastic elastomer material that does not melt is smaller, and its mechanical properties was significantly improved. When butylamine was used as an accelerator of desulfurization, under the reaction a certain condition (220 °C, 1000rpm, 2.4MPa), the tensile strength and elongation at break of obtained thermoplastic elastomer DGTR/HDPE/EPDM were tested as 12.8MPa and 614.6%, respectively. |
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