Reusable water writing paper capable of realizing long-time keeping after color developing

Abstract

The invention relates to reusable water writing paper capable of realizing long-time keeping after color developing. The water writing paper comprises a base material and a color developing layer covering the base material, wherein the base material is a known material such as paper, a polyester film, a polyvinyl chloride film or a polypropylene film which usually can be used for writing or printing. The reusable water writing paper is characterized in that the color developing layer is prepared from components in parts by weight as follows: 0.0005-2 parts of fluorane water-induced chromotropic dye, 100-300 parts of a solvent, 1-60 parts of a polyhydroxyl moisturizing additive, 0-10 parts of a functional aid and 0.01-20 parts of an adhesive; the fluorane water-induced chromotropic dye is shown in a formula in the description. The problem of short retention time of writing and / or patterns on conventional water writing paper is solved, the water writing paper can be recycled, and great contribution is made to saving of paper and sustained development of resources.

Description

technical field [0001] The invention relates to a reusable water writing paper which can be maintained for a long time after color development, and belongs to the field of reusable materials. Background technique [0002] Most writing or printing paper is discarded after being used once, causing serious waste. From the perspective of protecting the environment and reusing resources, the recycling of paper is particularly important. At present, reusable water writing paper is a very good way to solve the above problems because it replaces ink with water, is easy to operate, easy to carry and can be used many times. However, although the existing water writing paper (such as Chinese patent 201610444113.X) can be reused, the handwriting and / or patterns written or printed will gradually disappear with the volatilization of water, causing its retention time to be too short and not suitable for long-term use. Read and record. And Chinese patent (200410040260.8) reports a kind of...

AI Technical Summary

Problems solved by technology

However, although the existing water writing paper (such as Chinese patent 201610444113. X) can be reused, the handwriting and / or patterns written or printed will gradually disappear with the volatilization of water, resulting in too short a retention time, which is not suitable for long-term use. read and record

And Chinese patent (200410040260.8) reports a kind of water writing paper that can be maintained for a long time after color development, although the pattern and / or handwriting after color development can be maintained for a long time, but because it cannot fade away, the paper cannot be recycled.

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