Bisphenol-A-free heat-sensitive paper

Abstract

The invention discloses bisphenol-A-free heat-sensitive paper. The paper comprises an original paper layer and is characterized in that: a pre-coating layer and a colour development layer are coated on the original paper layer; an oxidizing agent in the colour development layer is 4,4'-dyhydroxydiphenylsulphone; and a sensitizing agent in the colour development layer is 1,1'-diphenylsulphone. The bisphenol-A-free heat-sensitive paper does not contain a bisphenol-A oxidizing agent which is harmful to a human body, and the colour development of the heat-sensitive paper is also applicable to currently generally used fax machines or cash printers. In the heat-sensitive paper, the pre-coating layer is used for covering an original paper surface, improving the surface feel of the paper, providing a certain heat insulation effect, remaining energy which is provided by a printing head as much as possible on the colour development layer during rear section printing and improving the efficiency of the colour development layer; and the colour development layer is used for undergoing an oxidizing reaction under the energy which is provided by the printing head, converting a colourless dyestuff into a black dyestuff and providing corresponding patterns or characters on the paper surface.

Description

technical field [0001] The invention relates to a production process of heat-sensitive paper, in particular to a heat-sensitive paper without bisphenol A. Background technique [0002] At present, most domestic fax-type or cash register-type thermal papers contain bisphenol A-type oxidants, which are endocrine disruptors and environmental hormones. There are various special chronic toxicities, such as carcinogenicity, teratogenicity, developmental toxicity, and fetal toxicity. The main manifestations of environmental hormones acting on the human body are: damage to the liver and immune system, affect the function of hormones, cause acne, indigestion, muscle and joint pain; increase skin fragility, rashes, blisters, impaired vision and hard blood lipids Wait. [0003] However, the use of other types of oxidants has a high melting point and cannot adapt to the technical difficulties of the current general-purpose fax or cash register printer printing energy section. To a cer...

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Problems solved by technology

[0003] However, the use of other types of oxidants has a higher melting point and cannot adapt to the technical difficulties of the current general-purpose fax or cash register printer printing energy segment, which to a certain extent has caused the inability to widely cancel the demand for bisphenol A in the production of thermal paper.

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