本文選題：自增強 + 聚氯乙烯管材　； 參考：《北京化工大學》2010年碩士論文

【摘要】： 隨著對塑料管材的需求量大幅度提高,應用領域不斷拓寬,以及使用要求不斷提高,各國對塑料管材的性能提出了更高的要求,如何既節(jié)省材料,又提高管材的各方面性能是塑料管材研究的一個重要方向。雙向拉伸自增強技術是一種制備高性能塑料管材的生產(chǎn)方法,該方法通過對管材進行軸向和環(huán)向拉伸取向,使管材力學性能得到自增強。這種自增強技術,對結晶材料和無定形材料都適用。 聚乙烯通過化學或物理方法引發(fā)交聯(lián)反應可以得到交聯(lián)聚乙烯,材料由線型結構轉變?yōu)槿S網(wǎng)狀結構,明顯的改善了聚乙烯的性能。聚乙烯交聯(lián)后,耐熱性及熱強度、耐熱氧老化性、耐環(huán)境應力開裂性、耐油性等都得到較大提高。本文研究了PEX管材的準動態(tài)連續(xù)擴張機理。 所謂準動態(tài)擴張是將管材的連續(xù)擴張分解成分段的靜態(tài)擴張,再將所有靜態(tài)擴張起來,加以控制之后實現(xiàn)的靜態(tài)擴張。每段管坯被擴張后,擴張段長度增加,在管坯來不及周向回縮時冷卻定型。本文給出了PEX管材的最佳實驗參數(shù),包括管材的加熱溫度、加熱時間、擴張壓力、擴張時間等。 本實驗中通過控制準動態(tài)連續(xù)擴張工藝參數(shù),得到的自增強取向PEX管材樣品其力學性能得到程不同度的提高。通過測試環(huán)向拉伸強度,雙向自增強PEX管材的拉伸強度最高可達到32.29%,彈性模量最大可提高13.06%,斷裂伸長率平均減小5.88%。
[Abstract]:With the increase of the demand for plastic pipe, the application field is widened, and the application requirement is improved, the performance of plastic pipe has been put forward higher requirements in many countries, how to save the material, It is an important direction to improve the properties of plastic pipes. The biaxial tensile self-reinforcing technique is a production method for the preparation of high performance plastic pipes. The mechanical properties of the pipes are self-reinforced by the axial and circumferential tensile orientation of the tubes. This self-reinforcing technique is suitable for both crystalline and amorphous materials. The crosslinking reaction of polyethylene initiated by chemical or physical method can lead to the crosslinking polyethylene. The material changed from linear structure to three-dimensional network structure, which obviously improved the properties of polyethylene. After crosslinking, the heat resistance, thermal strength, heat and oxygen aging resistance, environmental stress cracking resistance and oil resistance of polyethylene were greatly improved. In this paper, the mechanism of quasi-dynamic continuous expansion of PEX pipes is studied. The so-called quasi-dynamic expansion is to decompose the continuous expansion of the pipe into segmented static expansion and then control all static expansion to realize the static expansion. After each section is expanded, the length of the expansion section increases, and the tube blank is cooled and finalized when it is too late to retract in a circumferential direction. The optimum experimental parameters of PEX pipe are given in this paper, including heating temperature, heating time, expanding pressure, expanding time and so on. In this experiment, by controlling the process parameters of quasi-dynamic continuous expansion, the mechanical properties of the self-reinforced oriented PEX pipe samples were improved by different degrees of mechanical properties. By testing the circumferential tensile strength, the maximum tensile strength of biaxial self-reinforced PEX pipe can reach 32.29, the maximum elastic modulus can be increased 13.06, and the elongation at break decreases 5.88%.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2010
【分類號】：TQ325.1

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本文編號：1921766