表面处理对装饰原纸的纸页结构和性能的研究机制

发布时间：2018-03-09 16:11

  本文选题：装饰原纸　切入点：醚化酶化淀粉　出处：《山东轻工业学院》2012年硕士论文　论文类型：学位论文

【摘要】：人造板是以装饰纸浸渍树脂后与刨花板热压而成。装饰纸中因浸渍树脂在使用过程中会释放甲醛，对环境和人体产生危害。为减少纸页对树脂胶液的吸收进而减少纸页中的甲醛含量，本文采用实验室自制变性淀粉对装饰原纸进行表面施胶，再进行三聚氰胺甲醛树脂的浸渍，实验证明，表面施胶后装饰原纸能够显著降低对三聚氰胺甲醛树脂的浸胶量，同时能够提高纸页强度，增强其表面性能。 本文研究了装饰原纸的抄造工艺、表面施胶剂的制备、三聚氰胺甲醛树脂的浸渍工艺，得出以下结论。 1选取针叶木与阔叶木以6:4的比例抄造装饰原纸，可获得良好的纸页强度性能和吸液性能，抄造装饰原纸时加入30%的钛白粉，同时加入1.5%的分散剂，提高纸张的遮盖性，加入1.5%的CPAM助留助滤剂提高钛白粉在纸页上的留着，加入1.0%的PAE作为湿强剂以提高纸页的湿强性能，加入1.0%的硫酸铝调节浆料的pH，满足装饰原纸抄造需求。 2对原淀粉进行改性处理：首先，用3.0%(相对于原淀粉)的3-Cl-2-羟丙基三甲基氯化铵作为醚化剂对淀粉进行醚化处理，在1.0%(相对于原淀粉)NaOH碱性条件下处理140min，醚化温度为35℃，制得醚化淀粉；其次，将原淀粉用淀粉酶进行酶化处理，淀粉酶用量为原淀粉的0.1%，淀粉浓度为5%，酶化反应在85℃下进行，反应时间为20min；第三，以最佳醚化条件、最佳酶化条件对原淀粉进行醚化酶化处理，制得醚化酶化淀粉。 3将制得的三种变性淀粉对实验室抄造的装饰原纸进行表面施胶，通过对比施胶后纸页的吸液性能及干湿强度性能选取醚化酶化淀粉为最佳的表面施胶剂，醚化酶化淀粉最佳施胶量为1.5g/m2，此时可使纸页获得干湿抗张指数分别为32.06N m/g和13.67N m/g，表面吸水值和吸高分别为98.16%、27.56mm/10min。 4将纸页在三聚氰胺甲醛树脂中浸渍，通过一系列分析对比，最终得出最佳浸渍条件为：将表面施胶后的装饰原纸在三聚氰胺甲醛树脂中浸渍240s，选取最佳浸胶量为130%，之后将纸页干燥固化处理，固化温度为140℃，固化时间30min，此时纸页干湿强度为36.55N m/g、20.03N m/g，挥发物含量为6.31%，未施胶装饰原纸在此条件下的挥发物含量为10.24%。通过电镜及机理分析证明，醚化酶化淀粉施胶后装饰原纸对树脂的吸收量低，甲醛含量低，强度高，性能优异。
[Abstract]:Wood-based panels are made of decorative paper impregnated with resin and hot-pressed with particleboard. In decorative paper, formaldehyde is released during the use of impregnated resin. In order to reduce the absorption of resin glue solution and the formaldehyde content in the paper, the modified starch was used to sizing the decorative base paper, and then impregnated with melamine formaldehyde resin. Experimental results show that the surface sizing of decorative base paper can significantly reduce the amount of leaching of melamine formaldehyde resin, at the same time, it can improve the strength of the paper and enhance its surface properties. In this paper, the preparation of decorative base paper, the preparation of surface sizing agent and the impregnation of melamine formaldehyde resin are studied. 1 selecting coniferous wood and broadleaved wood to make decorative base paper with a ratio of 6: 4, good sheet strength and liquid absorption properties can be obtained. Adding 30% titanium dioxide into decorative base paper and adding 1.5% dispersant at the same time to improve the covering ability of paper, Adding 1.5% CPAM retention aid to improve the retention of titanium dioxide on paper, adding 1.0% PAE as wet strength agent to improve the wet strength of paper, adding 1.0% aluminum sulfate to adjust the pH of slurry, to meet the need of decorative base paper. 2Modification of the original starch: firstly, the starch was treated with 3-Cl-2-hydroxypropyltrimethylammonium chloride (3-Cl-2-hydroxypropyltrimethylammonium chloride) as etherifying agent, and the etherification temperature was 35 鈩，

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