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采用在廢舊輪胎膠粉熔融擠出過程中提高雙螺桿擠出機螺桿轉速的高剪切應力誘導方法，研究了雙螺桿擠出機的螺桿轉速、擠出反應溫度及脫硫促進劑品種對輪胎膠脫硫共混物的熔體流動速率、凝膠含量、溶膠紅外吸收光譜的影響；對脫硫輪胎膠（DGTR）/高密度聚乙烯（HDPE）/三元乙丙橡膠(EPDM)動態(tài)硫化熱塑性彈性體力學性能的影響及其制備的工藝條件進行考察。研究了亞臨界水結合高剪切應力對輪胎膠應力誘導脫硫的影響。實驗結果表明： （1）在輪胎膠粉與HDPE的熔融擠出高剪切應力誘導脫硫反應過程中，高轉速同向雙螺桿擠出機的高剪切作用，可誘發(fā)廢舊輪胎膠混合物中交聯網絡的斷鏈和解交聯反應，引起脫硫共混物凝膠含量的下降、未熔融凝膠顆粒尺寸的減小以及熔體流動速率的增加；擠出機螺桿轉速越快、擠出反應溫度越高，這種斷鏈和解交聯反應越明顯。 （2）在輪胎膠粉與HDPE的熔融擠出高剪切應力誘導脫硫反應過程中，促進劑仲丁醇、多烷基苯酚二硫化物（420或450）及正丁胺均具有明顯促進脫硫化反應的作用，引起了脫硫反應產物溶膠中丁苯橡膠成分的明顯增加。四種促進劑相比較，450或正丁胺作為促進劑的脫硫效果較好，并引起脫硫產物凝膠含量的下降、熔體流動速率的上升及動態(tài)交聯熱塑性彈性體力學性能的明顯改善。 （3）在采用脫硫共混物與EPDM制備DGTR/HDPE/EPDM動態(tài)交聯熱塑性彈性體的過程中，選擇DCP為主交聯劑，S為輔助交聯劑時，此動態(tài)交聯體系的交聯效果最優(yōu)。 （4）在正丁胺作為脫硫反應促進劑的最佳脫硫反應條件（240℃和1000r/min）下，高剪切應力誘導脫硫反應所得脫硫共混物的凝膠含量可達26.1%，熔體流動速率可達9.2g/10min。 動態(tài)硫化時選擇DCP為2phr，S為0.5phr的復合交聯體系，硫化時間為10分鐘時所得材料力學性能較佳。在此條件下，DGTR/HDPE/EPDM（40/40/20）動態(tài)硫化熱塑性彈性體材料的拉伸強度和斷裂伸長率分別達到12.5Mpa和440.6%。 （5）采用亞臨界水擠出法應力誘導廢舊輪胎膠脫硫化反應，將高剪切應力誘導解交聯反應技術與亞臨界流體分解、降解的解交聯反應技術相結合，這兩種作 用可產生協同效應，降低了交聯鍵發(fā)生斷裂的活化能，提高了交聯網絡斷裂效率，從而得到更好的脫硫效果。 （6）亞臨界水擠出法應力誘導廢舊輪胎膠粉與HDPE的熔融擠出脫硫反應過程中，擠出機螺桿轉速越快、擠出反應溫度越高以及亞臨界水壓力越大，輪胎膠粉交聯網絡受到的機械剪切應力和熱能作用越強，亞臨界水對輪胎膠交聯網絡的溶解和解交聯反應作用也明顯增強，這兩種作用的協同解交聯反應，引起脫硫共混物凝膠含量的下降和熔體流動速率的提升，引起脫硫共混物溶膠中雙鍵特征吸收峰強度明顯增大以及熱塑性彈性體材料力學性能的明顯改善。 （7）在亞臨界水擠出法應力誘導廢舊輪胎膠粉與HDPE的熔融擠出脫硫反應過程中，正丁胺作為脫硫促進劑時，脫硫共混物凝膠含量下降明顯，熔體流動速率上升，動態(tài)交聯熱塑性彈性體材料中未熔融的凝膠粒子尺寸較小，力學性能明顯改善。在正丁胺作為脫硫促進劑的最佳脫硫反應條件（220℃，1000rpm，2.4MPa）下，亞臨界水擠出法所得脫硫共混物制備DGTR/HDPE/EPDM熱塑性彈性體的拉伸強度和斷裂伸長率分別達到12.8MPa和614.6%。 |
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2樓2012-05-09 01:58:11
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3樓2012-05-09 02:40:23
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sltmac: 金幣+2 2012-05-09 08:54:13
高盧oo: 金幣+200, 翻譯EPI+1, ★有幫助, 翻譯的工作量蠻大 雖然效果較我預計有一定差距 還是謝謝 2012-05-09 22:35:57
sltmac: 金幣+2 2012-05-09 08:54:13
高盧oo: 金幣+200, 翻譯EPI+1, ★有幫助, 翻譯的工作量蠻大 雖然效果較我預計有一定差距 還是謝謝 2012-05-09 22:35:57
看樓主夠誠意，花了一個多小時翻譯了一下，僅供參考，非機械力化學專業(yè)，但曾經翻閱過雙螺桿擠出的資料。翻譯的不好，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. |
4樓2012-05-09 04:43:46
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