【作者】 罗英；

【导师】 张美云；

【作者基本信息】 陕西科技大学 ， 制浆造纸， 2012， 硕士

【摘要】 本课题是陕西省重大科技创新项目“果品高值化环保型育果袋纸成套技术的研究与示范”中的一部分。育果袋纸是在水果发育全过程中提供保护的一种特种纸、具有高附加值的农业技术用纸，必须具有高的抗水性及抗水耐久性，同时也要有良好的透气性，而且果农对育果袋纸的价格要求苛刻，因此应该尽可能多地降低生产成本。首先，本论文研究了育果袋纸的抗水性，研制了一种由石蜡、硬脂酸、硼砂和纯碱配制而成的具有高抗水性的石蜡乳液。实验研究表明，要制备得到良好性能的石蜡乳液，最佳的乳化工艺为：乳化温度80~90℃，乳化时间30~40min以及搅拌速度为600~800r/min；石蜡乳液的最佳配比为：石蜡100份、硬脂酸31份、硼砂9份以及纯碱2份，此时能使育果袋纸的抗水性达到83s，远高于国家A级标准要求的60s。其次，本论文对育果袋纸化学助剂的添加工艺进行了分析研究，结果表明：在浆料配比为80%废旧报纸纤维（打浆度为55~58°SR）和20%本色针叶木浆纤维（打浆度为55~58°SR），瓷土加填量为10%（对绝干浆而言）的条件下，各化学助剂的用量（对绝干浆而言）分别为：1.25%阳离子分散松香胶、7.5%抗水剂石蜡乳液、3%湿强剂三聚氰胺甲醛树脂以及6%硫酸铝，在此工艺条件下，育果袋纸的抗水效果能达到89s，透气度为7.9μm/(Pa·s)，经人工老化试验检测后，抗水性降至82s，变化率为-7.87%，仍满足育果袋纸的使用要求；此工艺条件下的育果袋纸不仅具有高且耐久的抗水性而且还具有良好的透气性。最后，为了降低育果袋纸的生产成本，需要添加废旧报纸纤维与本色针叶木浆纤维进行配抄。本论文分析研究了废旧报纸纤维用量对育果袋纸各项性能指标的影响，也为育果袋纸厂家根据自己的需要选择各纤维配比提供了依据。实验结果表明：抗水性随着废旧报纸纤维用量的增加呈先升高后下降的趋势，但最低值仍然优于国家的A级标准；透气度随废旧报纸纤维用量的增加呈上升趋势，透气性能越来越好；但是抗张指数、湿抗张指数和撕裂指数以及耐破指数均随废旧报纸纤维用量的增加而呈下降趋势，物理强度越来越差；柔软度值也是随废旧报纸纤维用量的增加而呈下降趋势，柔软性越来越好。最大的废旧报纸纤维用量可达到90%，此条件下配抄的育果袋纸各项性能指标为：定量50.9g/m~2、抗水性87s、表面吸水性9.7g/m~2、透气度9.5μm/(Pa·s)、抗张指数34.1N·m/g、湿抗张指数11.2N·m/g、撕裂指数6.4mN·m~2/g、耐破指数1.8KPa·m~2/g以及柔软度606mN，其性能均优于市面上的育果袋纸。更多还原

【Abstract】 The project is a part of Shaanxi province major innovation projectsof science and technology“The research and demonstration on a settechnology of high value environment-friendly fruit cultivating bagpaper”. The fruit cultivating bag paper is a kind of special paper thatprovide protection for the fruit during the fruit development process,which is agricultural technical paper with high value.It must have aproperty of high and permanent water resistance meanwhile it musthave the performance of good air permeability.However, the orchardworker has a requiremet for the price of the fruit cultivating bag paper,which requires the fruit cultivating bag paper manufacturer reduce thecost of production as much as possible.First of all, the water resistance of fruit cultivating bag paper wasstudied. A wax emulsion with a property of high water resistance wasdeveloped, which was made from wax, stearic acid, borax and sodiumcarbonate. After experimental research, the results showed that: Thewax emulsion has the good performance prepared under the condition ofemulsification temperature80~90℃, emulsification time30~40min andthe stirring rate600~800r/min. And the best composition of the waxemulsion is the100of wax,31of stearic acid,9of borax and2ofNa2CO3. In this case, the water resistance of fruit cultivating bag papercan reach83s, which is far higher than A level60s of national standardrequirements.In the second place, the chemical additives adding technology ofthe fruit cultivating bag paper was researched and analyzed. The resultsshowed that: The fiber composition is80%old newspaper fiber(55~58°SR of the beating degree) and20%unbleached needlewood pulpfiber (55~58°SR of the beating degree). In the condition of10%filling amount (for oven dry stock) of filler clay, the additive amounts (foroven dry stock) of the chemical additives respectively were:1.25%cationic rosin size,7.5%wax emulsion,3%wet-strengthening agents’melamine formaldehyde resin and6%aluminum sulfate. In this processcondition, the water resistance of fruit cultivating bag paper reached to89s, and its porosity is7.9μm/(Pa·s). After the detection ofar-accelerated aging test for the fruit cultivating bag paper, the waterresistance reduced to82s and the rate of change was-7.87%. However,the properties of fruit cultivating bag paper still could meet theoperational requirements. Therefore, in the production processconditions, not noly the water resistance of fruit cultivating bag paperwas high and permanent but also its air permeability was great.Finally, in order to reduce the production cost of fruit cultivatingbag paper, unbleached needles stock pulp need adding old newspaperpulp to manufacture it. In this paper, the influences of the oldnewspaper pulp fiber dosage on the various performance indicators ofthe fruit cultivating bag paper were researched and analyzed. Andselecting fiber composition was provided reference for the manufacturerof fruit cultivating bag paper according to their own needs. Theexperimental results showed that: with the increase of the oldnewspapers fiber dosage, the water resistance rose at first and thendescended, but the minimum value was still better than the national Alevel standard. With the increase of the old newspapers fiber dosage,porosity showed increasing tendency and air permeability became betterand better. With the increase of the old newspapers fiber dosage, tensileindex, wet tensile index, tear index and burst index showed decliningtendency and the physical strength performance of the fruit cultivatingbag paper became worse and worse. With the increase of the oldnewspapers fiber dosage, softness value also showed declining tendencyand the fruit cultivating bag paper became softer and softer. Themaximum dosage of old newspapers fiber could reached to90%, thevarious performance indicators of handmade fruit cultivating bag paperin this condition was that: quantitative weight50.9g/m~2, water resistance87s, surface water imbibition9.7g/m~2, porosity9.5μm/(Pa·s),tensile index34.1N·m/g, wet tensile index11.2N·m/g, tear index6.4mN·m~2/g, burst index1.8KPa·m~2/g and softness value606mN. Andthe performances were better than the properties of HT fruit cultivatingbag paper.更多还原