About the knowledge of thermal paper, everyone must have a deep understanding after reading my previous works. The following is the coating of thermal paper, that is, the color developer of thermal paper. Find out with me today! We not only choose high-quality thermal paper, but also choose the leading thermal paper factory.
Thermal coatings are very important in the production of thermal paper. The chemical substances in thermal coatings are usually synthesized from more than a dozen compounds in a certain proportion. However, the formulas of heat-sensitive coatings of various manufacturers are patented products, and they are different from each other. The basic proportions of the coatings are briefly introduced below.
(1) Leuco dyes, accounting for a few percent, there are many kinds of dyes, and the most commonly used are fluorane compounds. For example: 3-diethylamino-7-o-chlorobenzene fluorane, etc.
(2) Less than 20% color developer, commonly used in bisphenol A and paraben. Commonly used color-developing agents are: p-phenylphenol; methylene dinaphthol salicylate; aromatic sulfonic acid; aromatic sulfide; 2,4-dihydroxybenzoic acid.
(3) Less than 10% of sensitizers, such as benzenesulfonic acid amide compounds.
(4) Filler, accounting for less than 50%, calcium carbonate (granule) is often used. Effect: Improve paper opacity, improve image contrast with base color.
(5) Less than 10% binder, such as polyvinyl acetate. Function: Make the coating have better surface strength and printing performance, and can also form a colloidal protective film between the dye and the developer to isolate the two and prevent premature reaction.
(6) A few percent of stabilizers, such as dibenzoyl terephthalate.
(7) Lubricating oil, which is a few percent. Usually a waxy material that is used to prevent the thermal head from sticking.
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