發(fā)布時(shí)間：2018-04-24 02:45

  本文選題：聚乙烯電纜護(hù)套 + 耐環(huán)境應(yīng)力開裂(ESCR)��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：本文主要研究了聚乙烯電纜護(hù)套在使用過程中出現(xiàn)的環(huán)境應(yīng)力開裂問題。聚乙烯材料因其具有優(yōu)越的機(jī)械強(qiáng)度、韌性、耐熱性以及電絕緣性能,因此在電線電纜護(hù)套上得到廣泛的應(yīng)用。但是在應(yīng)用過程中存在著耐環(huán)境應(yīng)力開裂性能較差,嚴(yán)重影響了電纜的使用壽命,從而限制了聚乙烯材料的廣泛使用。為了分析聚乙烯電纜護(hù)套的的環(huán)境應(yīng)力開裂機(jī)理,采用了企業(yè)提供的開裂及未開裂聚乙烯電纜護(hù)套粒子及制件,通過FT-IR和DSC分析了研究了電纜絕緣護(hù)套材料中高密度聚乙烯和線性低密度聚乙烯對(duì)材料耐環(huán)境應(yīng)力開裂性能的影響,發(fā)現(xiàn)高密度聚乙烯易導(dǎo)致電纜材料開裂;通過TG研究了電纜絕緣護(hù)套的熱穩(wěn)定性能,發(fā)現(xiàn)提高抗氧劑抗氧效率可以提高材料的耐環(huán)境應(yīng)力開裂性能;凝膠含量和SEM測試表明材料的交聯(lián)度、與其耐環(huán)境應(yīng)力開裂性能相關(guān),交聯(lián)度較高的材料其耐環(huán)境應(yīng)力開裂性能也較優(yōu)異。為了分析不同組分配方對(duì)聚乙烯電纜護(hù)套的環(huán)境應(yīng)力開裂性能的影響,采用雙螺桿共混的方法制備了不同組實(shí)驗(yàn)樣品。研究了不同組分配方對(duì)力學(xué)性能、耐熱性能、耐收縮性能、以及耐環(huán)境應(yīng)力開裂性能的影響。發(fā)現(xiàn)隨著LLDPE和EVA含量的上升護(hù)套料的力學(xué)性能出現(xiàn)下降,但護(hù)套料的耐收縮性與耐環(huán)境應(yīng)力開裂性能得到大幅提升。發(fā)現(xiàn)隨著DCP含量的提高護(hù)套料的耐收縮及耐環(huán)境應(yīng)力開裂性能出現(xiàn)先上升后下降的趨勢。
[Abstract]:In this paper, the environmental stress cracking of polyethylene cable sheath is studied. Polyethylene is widely used in wire and cable sheath because of its excellent mechanical strength, toughness, heat resistance and electrical insulation. However, in the process of application, the environmental stress cracking resistance is poor, which seriously affects the service life of cables, thus limiting the wide use of polyethylene materials. In order to analyze the environmental stress cracking mechanism of polyethylene cable sheath, the cracked and uncracked polyethylene cable sheath particles and parts provided by enterprises were adopted. The effects of high density polyethylene and linear low density polyethylene on the environmental stress cracking resistance of cable insulation and sheath materials were studied by FT-IR and DSC. It was found that high density polyethylene could easily lead to cable material cracking. The thermal stability of cable insulation and sheathing was studied by TG. It was found that increasing the antioxidant efficiency could improve the environmental stress cracking resistance of the material, and the gel content and SEM test showed the crosslinking degree of the material. Environmental stress cracking resistance of materials with high crosslinking degree is also good. In order to analyze the effect of different distribution groups on the environmental stress cracking properties of polyethylene cable sheath, different groups of experimental samples were prepared by twin-screw blending method. The effects of different groups on mechanical properties, heat resistance, shrinkage resistance and environmental stress cracking resistance were studied. It was found that the mechanical properties of sheathing materials decreased with the increase of LLDPE and EVA content, but the shrinkage resistance and environmental stress cracking resistance of sheathing materials were greatly improved. It was found that with the increase of DCP content, the shrinkage resistance and environmental stress cracking resistance of sheathing materials increased first and then decreased.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ325.12;TM247

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本文編號(hào)：1794810