Novel reusable water writing paper

Abstract

The invention relates to a new type of reusable water writing paper. The water writing paper is composed of a color-developing component and a matrix. The color component, when exposed to water, can undergo a change in molecular configuration or conformation to cause an obvious color change and develop color. After the water dries, the molecular structure will recover and the color will fade, and different colors can be displayed through the change of molecular substituents. It can be written like a handwriting Clear, not easy to spread, smooth surface, reusable, it is not only suitable for brush books, drawing exercises, but also for daily writing with pens, in addition, it can also use water spray to achieve ink-free printing, due to the special response to water, this type of Water writing paper can also be used in humidity detection cards, security and anti-counterfeiting and other fields.

Description

technical field

[0001] The invention relates to a novel reusable water writing paper which develops color when exposed to water. It belongs to the field of reusable writing and printing materials. Background technique

[0002] The waste of one-time writing or printing paper is serious. From the perspective of protecting the environment and reusing resources, the recycling of paper is particularly important. There are also a large number of reusable water-colored water writing papers on the market at present, but the existing water writing papers are all composed of paper base, carbon black layer and spray white layer or directly composed of dark base paper and spray white layer. For example, Chinese patent CN2628572Y discloses a reusable water writing paper. However, they are all based on the fact that the sprayed white layer becomes transparent when it meets water, and the carbon black layer or the color of the dark base paper realizes the physical property change of wate...