本文選題：橡膠發(fā)泡 + 門尼黏度　； 參考：《陜西科技大學(xué)》2017年碩士論文

【摘要】：聚氨酯(PU)和乙烯-醋酸乙烯酯共聚物(EVA)是廣泛使用的發(fā)泡材料基體。PU發(fā)泡材料性能優(yōu)異,但其加工過程需以含異氰酸酯的預(yù)聚體為原料進(jìn)行液相發(fā)泡,原料毒性大、易揮發(fā),從而造成大氣污染,且成本昂貴。EVA成本低,但其使用性能差,常用于中低端產(chǎn)品。因此,開發(fā)一種性能優(yōu)異、價(jià)格便宜、普適性高的發(fā)泡材料具有重要意義。丁苯橡膠(SBR)力學(xué)性能優(yōu)異,成本低廉,可利用傳統(tǒng)工藝發(fā)泡,但作為主體制備發(fā)泡材料卻鮮見報(bào)道,這是因?yàn)镾BR發(fā)泡材料存在缺陷,一方面,該發(fā)泡材料易收縮,即收縮率和后收縮率大、尺寸穩(wěn)定性差;另一方面,門尼黏度大,不易于橡膠發(fā)泡材料的注射加工。針對上述科學(xué)問題本論文將從以下內(nèi)容進(jìn)行研究:(1)對SBR發(fā)泡材料的配方進(jìn)行研究。采用正交試驗(yàn)設(shè)計(jì)和單因素設(shè)計(jì)的方法,分別討論了發(fā)泡劑、交聯(lián)劑和添加助劑對SBR發(fā)泡材料性能的影響規(guī)律。通過掃描電鏡(SEM)、傅里葉紅外光譜儀(FTIR)、差示掃描量熱法(DSC)、拉曼光譜測試儀等檢測手段分析了兩種交聯(lián)劑(S和DCP)的協(xié)同作用對降低SBR發(fā)泡材料門尼黏度和收縮率的影響機(jī)理,首次提出了SBR在S和DCP交聯(lián)體系中的雙交聯(lián)過程,制備的SBR發(fā)泡材料門尼黏度和收縮率分別為23.4和2.25%,同時也使得抗張強(qiáng)度、斷裂伸長率和撕裂強(qiáng)度分別增加到3.475 MPa、54.63 N/mm和1.78×103%。(2)通過機(jī)械熔融共混法制備了SBR/EVA共混基體膠,采用SEM、FTIR、DSC和流變儀分別對共混基體膠的相容性和共硫化特性進(jìn)行了表征。結(jié)果表明:SBR與EVA的相容性隨著EVA含量的增加而增加,主要是因?yàn)镾BR分子鏈上的活潑氫與EVA分子鏈上的羧基氧形成的氫鍵作用。(3)通過模壓法制備SBR/EVA復(fù)合橡膠發(fā)泡材料,研究了EVA含量對SBR/EVA復(fù)合發(fā)泡材料的形貌、收縮性和尺寸穩(wěn)定性的影響規(guī)律,分析了在S和DCP都存在的條件下,SBR與EVA分子鏈之間發(fā)生交替交聯(lián)過程以及EVA在復(fù)合體系中起骨架支撐的作用,制備的SBR/EVA復(fù)合發(fā)泡材料的收縮率、后收縮率和門尼黏度分別達(dá)到1%、15%和20.4。
[Abstract]:Polyurethane (PUA) and ethylene-vinyl acetate copolymer (EVA) are widely used foaming materials. Pu foamed materials have excellent properties. However, the prepolymer containing isocyanates should be used for liquid phase foaming, which is toxic and volatile.As a result, the air pollution is caused, and the cost of EVA is low, but its performance is poor, so it is often used in middle and low end products.Therefore, it is of great significance to develop a foamed material with excellent performance, low price and high universality.Styrene-butadiene rubber (SBR) has excellent mechanical properties, low cost, and can be foamed by traditional technology. However, it is seldom reported to prepare foamed materials as the main body. This is due to the defects of SBR foaming materials. On the one hand, the foamed materials are easily contracted.On the other hand, Mooney viscosity is large and difficult to be used in injection processing of rubber foamed materials.In this paper, the formulation of SBR foaming material is studied from the following contents: 1: 1.The effects of foaming agent, crosslinking agent and additive on the properties of SBR foaming materials were discussed by orthogonal design and single factor design.By means of scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), differential scanning calorimetry (DSC) and Raman spectrometer, the mechanism of the synergistic effect of two kinds of crosslinking agents on Mooney viscosity and shrinkage of SBR foamed materials was analyzed.The double crosslinking process of SBR in S and DCP crosslinking systems was proposed for the first time. The Mooney viscosity and shrinkage of SBR foamed materials were 23.4 and 2.25, respectively.The tensile elongation at break and tear strength were increased to 3.475 MPA 54.63 N/mm and 1.78 脳 10 3 respectively. The SBR/EVA blend matrix was prepared by mechanical melt blending. The compatibility and vulcanization properties of the blends were characterized by SEM FTIR DSC and rheometer respectively.The results showed that the compatibility between SBR and EVA increased with the increase of EVA content, mainly because the active hydrogen on the SBR chain and the hydrogen bond formed by carboxyl oxygen on the EVA chain.The effects of EVA content on the morphology, shrinkage and dimensional stability of SBR/EVA composite foamed materials were studied.In the presence of both S and DCP, the alternating crosslinking process between EVA and EVA molecular chains and the role of EVA as skeleton support in the composite system were analyzed. The shrinkage of the SBR/EVA composite foamed material was also analyzed.The posterior contraction rate and Mooney viscosity reached 15% and 20.4% respectively.
【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ333.1;TB332

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