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为什么热敏纸遇热变黑？
热敏纸遇热变黑主要是因为热敏涂层中的无色染料与显色剂在高温下发生化学反应。
1、热敏涂层中无色染料与显色剂的存在。热敏纸表面涂有一层热敏涂层，其中含有无色染料和显色剂。在常温下，这些物质保持稳定，不会发生化学反应。
2、高温触发化学反应。当热敏纸受热至70℃以上时，热敏涂层中的无色染料与显色剂发生化学反应，生成黑色物质，使纸张变黑。
3、温度控制变色过程。热敏纸的变色反应对温度非常敏感，温度越高，反应速度越快，颜色变化越明显。这种特性使得热敏纸广泛应用于打印和记录。
总结：热敏纸遇热变黑，是因为热敏涂层中的无色染料与显色剂在高温下发生化学反应。
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