防护型热敏纸的制备及其性能研究
发布时间：2018-12-07 10:59
【摘要】：热敏记录纸作为一类信息记录材料,具有打印装置小巧灵活、打印耗材单一便宜、打印操作简单方便、打印过程安静快速、打印产品精细清晰等特点,在传真通信、医学成像、金融票据、物流标签等领域得到了广泛的使用。但热敏纸图像稳定性差的特点对其应用也有着众多的限制,而随着热敏纸应用范围的不断拓展,对高图像稳定性的防护型热敏纸的需求也越发强烈。针对普通热敏纸发色及防护性能,首次提出了通过求取饱和光密度值“变异系数”来量化评价热敏纸发色均匀性的方法,并用于指导热敏涂料配方的设计优化。通过对热敏涂料中BON、显色剂、隐色染料、填料等的种类和用量对热敏纸发色和防护性能的影响的研究,结果表明采用D8s显色剂,控制BON对发色组分的比例为1:4.2,碳酸钙对煅烧土的比例为4.1:1时,制得的普通热敏纸能获得较好的打印效果和防护性能。但仅对热敏层的配方进行优化还远不能满足国标对热敏纸防护性能的要求。顶涂层对热敏纸的防护性能起到关键作用。本文设计了以苯丙乳液为主要组分的顶涂涂料,通过在热敏纸表面涂布一层保护层的方式来改进普通热敏纸的防护性能。顶涂涂料优化实验中发现,通过加入碳酸钙填料可以改善热敏纸打印过程中的走行稳定性,同时因为填料在顶涂层中的“栅栏”效应,延长了分子扩散的路径,对顶涂后热敏纸的防护性能也有一定提升。PDA实验结果表明使用交联剂能够获得更加致密的顶涂层,从而提升顶涂后热敏纸的防护性能。采用氮杂环丙烷化合物和碳酸锆铵作为交联剂制得的顶涂热敏纸对水、植物油和酒精的防护性能已经完全能够满足国标中的要求。此外,顶涂后的热敏纸不需压光也能获得极高的平滑度,而通过不同交联剂的复配使用则能实现对热敏纸的印刷适性的优化。通过TEMPO氧化法和均质处理制备了纳米原纤化纤维(NFC),AFM照片显示制得的NFC直径在10~30nm左右。采用自然干燥的方法,通过NFC表面羟基间的氢键作用相互间紧密堆积从而制得致密连续的膜,对这种NFC膜的研究表明NFC膜对有机溶剂具有良好的稳定性和抗渗透性能。基于这一特性,本文首次将NFC作为保护层涂布在普通热敏纸表面,涂布量为4g/m2。研究发现制得的NFC顶涂热敏纸具有优异的抗有机溶剂特性、运行适性和印刷适性。
[Abstract]:As a kind of information recording material, thermal recording paper is characterized by small and flexible printing device, simple and cheap printing consumables, simple and convenient printing operation, quiet and fast printing process, fine and clear printing products, etc., in facsimile communication, medical imaging, etc. Financial instruments, logistics labels and other fields have been widely used. However, the poor image stability of thermal paper has many limitations on its application, and with the continuous expansion of the application of thermal paper, the demand for high image stability protective thermal paper is becoming more and more intense. Aiming at the color and protection performance of common thermosensitive paper, the method of evaluating the color homogeneity of heat sensitive paper by calculating the "coefficient of variation" of saturated optical density is put forward for the first time, which can be used to guide the design and optimization of heat sensitive coating formulation. The effects of the types and contents of BON, cryptic dyes and fillers on the color and protective properties of thermistor paper were studied. The results showed that the proportion of BON to chromogenic component was 1: 4.2 by using D8s chromogenic agent. When the ratio of calcium carbonate to calcined soil is 4.1: 1, the general thermal sensitive paper can obtain better printing effect and protective performance. However, the formulation of thermal sensitive layer can not meet the requirements of national standards for thermal protection performance. Top coating plays a key role in the protective performance of thermal sensitive paper. In this paper, a top coating with styrene-acrylic emulsion as the main component is designed to improve the protective performance of common thermal paper by coating a protective layer on the surface of thermal paper. In the optimization experiment of top coating, it is found that adding calcium carbonate filler can improve the running stability of thermal paper during printing, and because of the "fence" effect of filler in top coating, the molecular diffusion path is prolonged. The results of PDA experiments show that a more compact top coating can be obtained by using crosslinking agent to improve the protective performance of the top coated thermistor paper. The protective properties of water, vegetable oil and alcohol prepared by using heterocyclic propane compound and ammonium zirconate as crosslinking agent can fully meet the requirements of national standard. In addition, the heat sensitive paper with top coating can obtain high smoothness without calendering, and the printing adaptability of thermal paper can be optimized by the combination of different crosslinking agents. By TEMPO oxidation and homogenization treatment, the NFC diameter of nanofibrillar fiber was about 10~30nm, which was obtained by (NFC), AFM photo display. By using natural drying method, a compact and continuous NFC film was prepared by the close accumulation of hydrogen bonds between hydroxyl groups on the surface of NFC. The study of this kind of NFC film shows that the NFC membrane has good stability and permeability to organic solvents. Based on this characteristic, NFC is first used as a protective coating on the surface of common thermal paper with a coating amount of 4 g / m ~ (2). It is found that the NFC top coated thermosensitive paper has excellent resistance to organic solvent, running adaptability and printing adaptability.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TS761
本文编号：2367094
[Abstract]:As a kind of information recording material, thermal recording paper is characterized by small and flexible printing device, simple and cheap printing consumables, simple and convenient printing operation, quiet and fast printing process, fine and clear printing products, etc., in facsimile communication, medical imaging, etc. Financial instruments, logistics labels and other fields have been widely used. However, the poor image stability of thermal paper has many limitations on its application, and with the continuous expansion of the application of thermal paper, the demand for high image stability protective thermal paper is becoming more and more intense. Aiming at the color and protection performance of common thermosensitive paper, the method of evaluating the color homogeneity of heat sensitive paper by calculating the "coefficient of variation" of saturated optical density is put forward for the first time, which can be used to guide the design and optimization of heat sensitive coating formulation. The effects of the types and contents of BON, cryptic dyes and fillers on the color and protective properties of thermistor paper were studied. The results showed that the proportion of BON to chromogenic component was 1: 4.2 by using D8s chromogenic agent. When the ratio of calcium carbonate to calcined soil is 4.1: 1, the general thermal sensitive paper can obtain better printing effect and protective performance. However, the formulation of thermal sensitive layer can not meet the requirements of national standards for thermal protection performance. Top coating plays a key role in the protective performance of thermal sensitive paper. In this paper, a top coating with styrene-acrylic emulsion as the main component is designed to improve the protective performance of common thermal paper by coating a protective layer on the surface of thermal paper. In the optimization experiment of top coating, it is found that adding calcium carbonate filler can improve the running stability of thermal paper during printing, and because of the "fence" effect of filler in top coating, the molecular diffusion path is prolonged. The results of PDA experiments show that a more compact top coating can be obtained by using crosslinking agent to improve the protective performance of the top coated thermistor paper. The protective properties of water, vegetable oil and alcohol prepared by using heterocyclic propane compound and ammonium zirconate as crosslinking agent can fully meet the requirements of national standard. In addition, the heat sensitive paper with top coating can obtain high smoothness without calendering, and the printing adaptability of thermal paper can be optimized by the combination of different crosslinking agents. By TEMPO oxidation and homogenization treatment, the NFC diameter of nanofibrillar fiber was about 10~30nm, which was obtained by (NFC), AFM photo display. By using natural drying method, a compact and continuous NFC film was prepared by the close accumulation of hydrogen bonds between hydroxyl groups on the surface of NFC. The study of this kind of NFC film shows that the NFC membrane has good stability and permeability to organic solvents. Based on this characteristic, NFC is first used as a protective coating on the surface of common thermal paper with a coating amount of 4 g / m ~ (2). It is found that the NFC top coated thermosensitive paper has excellent resistance to organic solvent, running adaptability and printing adaptability.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TS761
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