氧化淀粉的疏水改性及其在食用包装纸中的应用研究

发布时间：2018-05-07 06:03

本文选题：疏水性淀粉 + 淀粉膜　；参考：《华南理工大学》2016年硕士论文

【摘要】：基于食品包装材料存在的安全、环保和可降解等问题,以氧化淀粉为原料进行疏水改性处理,获得了辛烯基琥珀酸氧化淀粉酯(OOS淀粉),研究了OOS淀粉成膜后的透水、透油性,在此基础上探索了淀粉酯在纸张施胶中的应用及其防油性,研究结果对开发新型食用包装纸涂料具有重要的理论指导和现实意义。具体研究结果如下:1、OOS淀粉的制备和结构表征。制备不同取代度的OOS淀粉,研究发现,OOS淀粉颗粒较氧化淀粉更易在水中分散均匀,红外光谱和1H核磁共振图谱证实辛烯基琥珀酸酐(OSA)与氧化淀粉发生酯化反应,热力学性质表明,随着OOS淀粉取代度的提高,其糊化温度逐渐降低。2、氧化酯化淀粉膜(OOS-淀粉膜)和高疏水性淀粉膜(OOS-SiO2-淀粉膜)的制备和表征。在不同取代度的OOS淀粉中添加一定量的甘油和纳米二氧化硅,而后完全糊化,利用流延法制备不同淀粉膜,研究发现酯化淀粉膜的透油、透水率明显低于氧化淀粉膜,且加入纳米二氧化硅后,可进一步降低淀粉膜的透油、透水率。3、OOS淀粉对纸张性能的影响。选用酯化淀粉膜透油、透水性能优异的三种酯化淀粉应用在纸张的表面施胶工艺中,探讨不同OSA添加量、淀粉乳浓度、加热糊化时间、表面施胶量等对纸张的抗油性和疏水性的影响,并研究OOS淀粉施胶液对纸张光学性能和物理性能的影响。结果表明,3%OSA添加量、20%淀粉乳浓度、加热20min、施胶量为59.6g/m2,施胶纸张具有8级的防油值,Cobb60为17.6,比原纸(27.5)降低36%,纸张表面粗糙度降低,撕裂强度、抗张强度、耐折度都有所增加,满足防油食品包装纸的抗渗透性和机械性能要求。4、研究了OOS淀粉/明胶复合淀粉防油剂对纸张性能的影响。研究发现,将明胶和OOS淀粉复配,施胶纸张的防油值达到9级,较单纯使用OOS淀粉施胶具有更好的防油效果,研究结果对防油包装纸的开发具有参考价值。
[Abstract]:Based on the safety, environmental protection and degradability of food packaging materials, the hydrophobic modification of oxidized starch was carried out, and the water permeability and oil permeability of OOS starch after film formation were studied. On this basis, the application of starch ester in paper sizing and its oil resistance were explored. The research results have important theoretical guidance and practical significance for the development of new edible packaging paper coatings. The results are as follows: the preparation and structure characterization of OOS starch. OOS starch with different degree of substitution was prepared. It was found that the starch particles were more uniform in water than that of oxidized starch. The IR spectra and 1H NMR spectra confirmed that octenyl succinic anhydride (OSA) reacted with the oxidized starch. The thermodynamic properties showed that the gelatinization temperature of OOS starch decreased gradually with the increasing degree of substitution of OOS starch, the preparation and characterization of oxidized starch film OOS-starch film and high hydrophobic starch film OOS-SiO2-starch film. Adding a certain amount of glycerol and nano-silica to OOS starch with different degree of substitution, and then completely gelatinizing, different starch films were prepared by casting method. It was found that the oil permeability of esterified starch film was obviously lower than that of oxidized starch film, and the water permeability of esterified starch film was obviously lower than that of oxidized starch film. The addition of nano-silica can further reduce the oil permeability of starch film, and the effect of water permeability of OOS starch on paper properties. Three kinds of esterified starch with excellent water permeability and oil permeation were used in the surface sizing process of paper. The content of OSA, the concentration of starch milk and the time of heating gelatinization were discussed. The effects of surface sizing amount on the oil resistance and hydrophobicity of paper were studied. The effects of OOS starch sizing solution on the optical and physical properties of paper were studied. The results showed that the concentration of starch milk was 20%, heating time was 20 min, the sizing amount was 59.6 g / m ~ (2), the oil proof value of sizing paper was 17.6% and Cobb60 was 17.6%, which was lower than that of base paper (27.5%). The surface roughness, tear strength, tensile strength and folding resistance of the paper were decreased. The effects of OOS starch / gelatin compound starch oil inhibitor on paper properties were studied. It was found that when gelatin and OOS starch were mixed, the oil-proof value of sizing paper was up to 9 grade, which was better than that of OOS starch sizing. The research results had reference value for the development of oil-proof packaging paper.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O636.12;TS206.4

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