【摘要】：復(fù)合材料中,不飽和聚酯樹脂(UPR)是使用量最大的樹脂品種之一,在結(jié)構(gòu)、防腐、絕緣材料等領(lǐng)域有廣泛的應(yīng)用。但通用的不飽和聚酯樹脂仍存在一些不足,如固化后硬而脆,韌性差,強(qiáng)度低等,故其應(yīng)用場(chǎng)合受到極大的限制,因此,對(duì)不飽和聚酯樹脂進(jìn)行改性具有重要意義。通常,改性后不飽和聚酯樹脂的觸變性高低對(duì)其施工具有重要影響,獲得優(yōu)異觸變性的不飽和聚酯樹脂一直是其改性的熱點(diǎn)。氣相二氧化硅具有納米顆粒尺度和豐富的表面羥基,是高分子材料優(yōu)選的補(bǔ)強(qiáng)劑和觸變劑。本論文采用氣相二氧化硅改性不飽和聚酯樹脂,通過配方及工藝優(yōu)化,對(duì)比國產(chǎn)與進(jìn)口氣相二氧化硅之間差異,制備出滿足客戶使用要求的新型不飽和聚酯。論文首先研究了多種型號(hào)氣相二氧化硅的物化性質(zhì),包括填充密度、比表面積、離散度、粒子形態(tài)、紅外光譜等,在此基礎(chǔ)上,研究氣相二氧化硅型號(hào)及含量、分散速度、分散時(shí)間、苯乙烯單體含量對(duì)不飽和聚酯樹脂觸變性及樹脂澆鑄體力學(xué)性能的影響。結(jié)果表明,隨著氣相二氧化硅用量的增加,不飽和聚酯樹脂觸變性顯著增加,不同型號(hào)氣相二氧化硅對(duì)不飽和聚酯樹脂觸變性影響強(qiáng)弱順序?yàn)?N-20HL-200MHL-200A-200HL-150;作為不飽和聚酯樹脂的交聯(lián)劑與稀釋劑,苯乙烯不僅可降低體系的粘度,還能改善體系的觸變性,隨著苯乙烯用量的增加,不飽和聚酯樹脂的觸變性明顯增大。不飽和聚酯樹脂的拉伸強(qiáng)度和彈性模量隨著氣相二氧化硅用量、分散時(shí)間、分散速度的增加而增大,斷裂伸長率則正好相反,不同型號(hào)氣相二氧化硅對(duì)不飽和聚酯樹脂的增強(qiáng)效果大小順序?yàn)?N-20HL-200MHL-200A-200HL-150;隨著苯乙烯含量的增加,不飽和聚酯樹脂的拉伸強(qiáng)度和斷裂伸長率先快速增加,當(dāng)含量超過32.5%時(shí),拉伸強(qiáng)度逐漸下降,斷裂伸長率則緩慢上升;拉伸斷面的SEM分析發(fā)現(xiàn),氣相二氧化硅顆粒粒徑較小,且在樹脂基體中分散較為均勻,斷面呈現(xiàn)韌性斷裂。
[Abstract]:Unsaturated polyester resin (UPR) is one of the most widely used resins in composite materials. It is widely used in the fields of structure, anticorrosion, insulation and so on. But the general unsaturated polyester resin still has some shortcomings, such as hard and brittle after curing, poor toughness, low strength, so its application is greatly limited. Therefore, it is of great significance to modify unsaturated polyester resin. Generally, the thixotropy of the modified unsaturated polyester resin has an important effect on its construction, and obtaining excellent thixotropic unsaturated polyester resin has always been the focus of its modification. Gas phase silica is a kind of reinforcing agent and thixotropic agent for polymer materials because of its nanometer particle size and abundant surface hydroxyl groups. In this paper, the unsaturated polyester resin modified by gas phase silica was used. By optimizing the formula and process, a new type of unsaturated polyester was prepared by comparing the difference between domestic and imported gas phase silica. Firstly, the physical and chemical properties of various types of gas phase silica are studied, including filling density, specific surface area, dispersion, particle morphology, infrared spectrum and so on. The influence of dispersing time, styrene monomer content on thixotropy of unsaturated polyester resin and mechanical properties of resin casting. The results show that the thixotropy of unsaturated polyester resin increases with the increase of the amount of gas phase silica. The order of thixotropy of unsaturated polyester resin with different types of gas phase silica is N-20HL-200MHL-200A-200HL-150; As the crosslinking agent and diluent of unsaturated polyester resin, styrene can not only reduce the viscosity of the system, but also improve the thixotropy of the system. With the increase of the amount of styrene, the thixotropy of unsaturated polyester resin increases obviously. The tensile strength and elastic modulus of unsaturated polyester resin increase with the increase of the amount of gas phase silica, dispersing time and dispersing speed, but the elongation at break is just the opposite. The order of reinforcing effect of different types of gas phase silica on unsaturated polyester resin is N-20HL-200MHL-200A-200HL-150; With the increase of styrene content, the tensile strength and elongation at break of unsaturated polyester resin first increase rapidly. When the content exceeds 32.5, the tensile strength decreases gradually, and the elongation at break increases slowly. The SEM analysis of tensile fracture shows that the particle size of gas phase silica is small and dispersed uniformly in the resin matrix, and the fracture of the section is ductile.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ323.4;TQ127.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 未明,黃志杰,左美群,馬全利;納米SiO_2在不飽和聚酯樹脂中的應(yīng)用[J];化工新型材料;1998年08期

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本文編號(hào)：2298781