本文選題：雜化復(fù)合膜 + 溶膠-凝膠�。� 參考：《浙江理工大學(xué)》2010年碩士論文

【摘要】： 聚烯烴類薄膜由于透明、易加工、價格低廉等優(yōu)點而被廣泛應(yīng)用于食品、藥品及電子元器件等商品的包裝方面,但是,氧氣、二氧化碳、水蒸氣和有機(jī)小分子等物質(zhì)易透過這些包裝薄膜而影響被包裝物的品質(zhì)與壽命。 因此,為了提高常用的雙向拉伸聚丙烯(BOPP)薄膜的阻隔性能以滿足阻隔性包裝的需要,本文采用溶膠-凝膠法,以正硅酸乙酯(TEOS)為前驅(qū)體、添加硅烷偶聯(lián)劑γ-縮水甘油醚氧丙基三甲氧基硅烷(KH560)以提高涂層與基體的附著牢度、無水乙醇為共溶劑、鹽酸為催化劑,在BOPP薄膜上負(fù)載SiO_2層。再以聚乙烯醇(PVA)和殼聚糖(CS)為有機(jī)物,制備PVA/SiO_2有機(jī)-無機(jī)雜化層和CS/SiO_2有機(jī)-無機(jī)雜化層。最終,制備了三種BOPP基阻隔性包裝復(fù)合薄膜,并表征和測試其結(jié)構(gòu)與性能。主要結(jié)論如下: 在SiO_2/BOPP阻隔性復(fù)合薄膜中,通過正交試驗和單因素試驗,分別討論了KH560/TEOS摩爾比、無水乙醇量、去離子水量和鹽酸量四個因素對復(fù)合薄膜阻隔性能的影響。確定制備SiO_2阻隔性復(fù)合薄膜原料的最佳摩爾配比為:(TEOS+KH560):乙醇:去離子水:鹽酸=1:4:3:1.2,KH560:TEOS =2:3。此時,SiO_2復(fù)合薄膜的氧氣阻隔性能是純BOPP薄膜的21倍;水蒸氣阻隔性能是純BOPP薄膜的1.7倍;拉伸強(qiáng)度、斷裂伸長率和透光率均優(yōu)于純BOPP薄膜。 在PVA/SiO_2/BOPP雜化阻隔性復(fù)合薄膜中,隨PVA含量的增加,雜化復(fù)合薄膜的氧氣阻隔性能提高,但水蒸氣阻隔性能降低。當(dāng)PVA質(zhì)量分?jǐn)?shù)為80%時,雜化復(fù)合薄膜的氧氣阻隔性能是純BOPP薄膜的308倍;但水蒸氣阻隔性能是純BOPP薄膜的一半;拉伸強(qiáng)度和斷裂伸長率分別是純BOPP薄膜的1.4倍和1.7倍;透光率大于90%,具有良好的透明性。 在CS/SiO_2/BOPP雜化阻隔性復(fù)合薄膜中,雜化層與BOPP薄膜緊密附著,表面無分相或開裂現(xiàn)象。隨CS含量的增加,雜化復(fù)合薄膜的氧氣阻隔性能先提高后降低;水蒸氣阻隔性能持續(xù)降低。當(dāng)CS質(zhì)量分?jǐn)?shù)為18%時,雜化復(fù)合薄膜的氧氣阻隔性能是純BOPP薄膜的112倍;水蒸氣阻隔性能是BOPP薄膜的1.3倍;拉伸強(qiáng)度和斷裂伸長率分別是純BOPP薄膜的1.5倍和1.8倍;透光率低于純BOPP薄膜,但仍具有良好的透明性。
[Abstract]:Polyolefin films are widely used in packaging of food, medicine and electronic components due to their advantages of transparency, easy processing and low price. However, oxygen, carbon dioxide, carbon dioxide, etc.Substances such as water vapor and small organic molecules can easily affect the quality and life of the packaged materials through these packaging films.Therefore, in order to improve the barrier properties of the commonly used biaxially stretched polypropylene (BOPP) films to meet the needs of barrier packaging, a sol-gel method with tetraethyl orthosilicate (TEOS) as the precursor was used in this paper.Silane coupling agent 緯 -glycidyl ether oxy propyl trimethoxysilane (KH 560) was added to improve the adhesion fastness of the coating to the substrate. Anhydrous ethanol was used as the co-solvent and hydrochloric acid as the catalyst to support the SiO_2 layer on the BOPP film.PVA/SiO_2 organic-inorganic hybrid layer and CS/SiO_2 organic-inorganic hybrid layer were prepared by using polyvinyl alcohol (PVA) and chitosan (CS) as organic compounds.Finally, three kinds of BOPP based barrier packaging composite films were prepared, and their structures and properties were characterized and tested.The main conclusions are as follows:The effects of KH560/TEOS molar ratio, anhydrous ethanol, deionized water and hydrochloric acid on the barrier properties of SiO_2/BOPP films were discussed by orthogonal test and single factor test.The optimum molar ratio of SiO_2 barrier composite film was determined to be: 1: 1: 4: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 3.The oxygen barrier property of SiO2 composite film is 21 times of that of pure BOPP film, the water vapor barrier property is 1.7 times that of pure BOPP film, and the tensile strength, elongation at break and transmittance of pure BOPP film are better than that of pure BOPP film.In PVA/SiO_2/BOPP hybrid barrier composite film, the oxygen barrier property of hybrid composite film increases with the increase of PVA content, but the water vapor barrier property decreases.When the mass fraction of PVA is 80, the oxygen barrier property of hybrid composite film is 308 times that of pure BOPP film, but the water vapor barrier property is half of that of pure BOPP film, the tensile strength and elongation at break are 1.4 times and 1.7 times of that of pure BOPP film, respectively.The transmittance is greater than 90 and has good transparency.In CS/SiO_2/BOPP hybrid barrier composite film, the hybrid layer is tightly attached to BOPP film, and there is no phase separation or cracking on the surface.With the increase of CS content, the oxygen barrier property of hybrid composite films first increases and then decreases, while the water vapor barrier performance decreases continuously.When CS mass fraction is 18, the oxygen barrier property of hybrid composite film is 112 times that of pure BOPP film, the water vapor barrier property is 1.3 times of that of BOPP film, the tensile strength and elongation at break are 1.5 times and 1.8 times of that of pure BOPP film, respectively.The transmittance of BOPP film is lower than that of pure BOPP film, but it still has good transparency.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2010
【分類號】：TB383.2;TB484

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