The Preparation And Characterization Of A Specialty Thermal Sensitive Recording Paper With Excellent Protective Properties

Thermal sensitive recording paper(thermal paper) is a kind of information recording material. Because of the small print device, single printing supplies, convenient operating procedures, fast and quiet printing process and legible printing products, thermal paper now is widely used in the area such as fax communication, medical imaging, financial instrument, logistics label and so on. But the poor image stability of the thermal paper make it restricted in many applications. A burning desire of a thermal paper with excellent protective property is growing with each passing day.In this paper, first, we study the coloring forming property and the protective property of the common thermal paper, and firstly provide a method to quantitatively evaluate the coloring evenness of the paper which is saturated coloring and used for the optimizing of the thermal coating. The kind and consumption of the BON, developer, lueco dye and filler in the coating on the effect of the coloring forming property and the protective property were studied. The results showed that a better formula was to use the D8 s developer and control the proportion of BON vs coloring components was 1:4.2 and PCC vs kaolin was 4.1:1. However, these improvements were not enough for the requirement of the national standard of a protection thermal paper.A top-coating layer has great influence on the protective property of a thermal sensitive paper. In this paper, we desired a protective coating based on the styrene-acrylic emulsion to improve the protective property of the thermal paper by coating it on top of the thermal paper. In the experiments, we found that the addition of the PCC in the top coating can improve the stability during the printing process and enhance the solvent resistance of the top-coated paper by increasing the diffusion path of the molecular. The PDA testing results showed that the utilize of the crosslinking agent can make the protective layer more closed and that will contribute to the improvement of the protective property of the top-coated thermal paper. The solvent resistance test results showed that the samples utilized the aziridine and Ammonium zirconium Carbonate crosslinking agents can reach the requirement of the national standard. Furthermore, the top-coating have great promoted the smoothness of the thermal paper without extra calendaring process.The NFC suspension was prepared by TEMPO-oxidation followed by a homogenizing process. The AFM image shows that the diameter of the NFC is about 10~30 nm. These 1D nanomaterials formed a dense film by close packing due to the hydrogen-bond interaction between the hydroxyl during the free-drying process. The solvent resistant study of the NFC film showed that the pure NFC film is stable in organic solvents and can dramatically prevent the penetration of the solvents. Based on this property, in this study, we firstly prepared a NFC-coated thermal paper with superior organic solvent resistance, runnability and well printability in a coating weight of 4 g/m2.