Bisphenol A (BPA) is one of the most widely used chemicals in the world, with over 8 billion pounds produced annually, according to data. About 94% of BPA is used in polycarbonate plastics and in food and beverage containers. It has two benzene rings connected by an isopropyl bridge.BPA has good mechanical properties and transparency, but the chemical, can cause a range of effects on estrogen and thyroid hormones in the body.
BPS, or bisphenol S, is an alternative to BPA. It also has two benzene rings, but is connected by a sulfonyl bridge.BPS is considered safer than BPA in some respects, but its health effects remain controversial. BPS has been shown to have a longer half-life and greater ability to penetrate skin than BPA.
The role of BPA in thermal paper is to act as a colour developer for its surface chemistry. When thermal paper is heated, BPA reacts chemically to produce black text or images. However, due to its potential health risks, many countries and regions have begun to restrict its use in thermal paper. As an alternative to BPA, BPS is gradually becoming more widely used in thermal paper.The mechanism of action of BPS in thermal paper is similar to that of BPA, but its chemical structure gives it an advantage in certain aspects. Studies have shown that BPS may be less endocrine disruptive than BPA, but its long-term health effects require further study.
The main hazard of BPA and BPS in thermal paper is due to the fact that BPA and BPS are added in free form and are not polymerised with the paper. As a result, these molecules can easily be transferred to anything that comes in contact with the paper, including skin that comes in contact, among other things. While BPS is considered a safe alternative to BPA, this is limited to high-quality BPS or surface-treated thermal paper. The endocrine disruptive properties of BPS at this point in time are drastically improved to reduce the impact on people.
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As concerns about the health effects of BPA and BPS increase, researchers are developing new non-BPA colour developers. These new materials not only need to have good colour development properties, but also meet environmental and health requirements. Some of the new colour developers have already achieved initial results in the laboratory, but their large-scale application will take time.
In conclusion, although the application of BPA and BPS in thermal paper brings convenience, its health risk should not be ignored. Through continuous research and innovation, it is hoped that new colour developers will emerge in the future to solve these problems.
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