Preparation method of writable thermo-sensitive paper

Abstract

The invention discloses a preparation method of writable thermo-sensitive paper, and belongs to the technical field of preparation of special thermo-sensitive papers, the thermo-sensitive paper is prepared by sequentially coating a pre-coating layer and a thermo-sensitive coating layer on raw paper, and the thermo-sensitive coating layer comprises the following components in parts by mass: 8-11 parts of thermo-sensitive dye; 16 to 20 parts of a thermosensitive color developing agent; 8-13 parts of a sensitizer; 30 to 45 parts of filler; 6-10 parts of a lubricant; 6 to 10 parts of polyvinyl alcohol; 0.4 to 0.8 part of a dispersing agent; 0.4 to 0.8 powder of a defoaming agent; 0.8 to 1.3 parts of a wetting leveling agent; the filler comprises nano silicon dioxide; according to the invention, the functional ink absorption material is added into the thermosensitive coating, so that the writing function on the thermosensitive paper is successfully realized, the ink can be absorbed and dried by the writable thermosensitive paper within 2 seconds after writing, and the application field of the thermosensitive paper is expanded.

Description

technical field [0001] The invention relates to the technical field of preparation of special thermal paper, in particular to a preparation method of writable thermal paper. Background technique [0002] Thermal paper, also known as thermal fax paper, thermal recording paper, thermal copy paper, is a special kind of coated processed paper. "Coating", under the condition of heat, the heat-sensitive coating powder mixes to develop a color reaction to complete the printing. It has been widely used in the fields of communication, medical treatment, logistics, and supermarkets. [0003] For writing paper, it is generally required that the paper absorbs the ink quickly. After writing, the ink is mainly absorbed by the capillary action of the paper fiber. The low molecular weight binder and solvent pass through the small pores and the rough surface of the paper fiber at a relatively slow speed. Entering the inside of the paper, with the extension of time, the solvent content in th...

AI Technical Summary

Problems solved by technology

[0004] With the rapid development of social economy and science and technology, thermal paper has increasingly shown a wide range of uses and an important market position due to its excellent performance. It is necessary to continuously develop new varieties to meet the needs of different application fields and expand the thermal paper. consumption, and because the thermal paper is coated with a thermal coating, and in order to improve printing clarity and facilitate paper feeding, the surface smoothness of thermal paper is generally relatively high, which will inevitably make the capillary formed by the fiber gap on the paper surface The number and diameter of the thermal paper are reduced, the roughness is reduced, and the ink absorption ability is reduced. Therefore, the ink trace written on the thermal paper can be easily wiped off. Generally, thermal paper is not suitable for writing, and it is difficult to meet the needs of different application fields.