Color-changing oil ink

Abstract

The invention relates to a color changing ink, comprising color changing agent, color-developing agent, glycerin, alcohol, sodium nitrite and clwan water. Said color changing agent comprises thymolphthalein and fenolftaleina, thymolphthalein is used for blue ink, the color changin domain is from 9.3- 10.5, and can change from colorless to blue; fenolftaleina is used for red ink, the color changing domain is from 8.2 to 10, and can change from colorless to red. The color-developing agent is calcium hydroxide, which can disslove into glycerin, and is used for pH moderation. The glycerin is used as solvent and shaping agent, can disslove in water at any ratio, and the coagulating point is quite low. Said alcohol is used as assisting solvent, and nitrite sodium is used as protecting agent. The preparing process comprises stirring produced mixing liquid, stewing in colsed container for 2 to 3 days, and the supernatant can be used as said color changing ink. The invention belongs to student article, and can be widely used for student writing practice, which can save a large amount of paper.

Description

Technical field: [0001] The invention relates to writing ink, in particular to a color-changing ink. Background technique: [0002] The color-changing ink of the prior art is mainly used in anti-counterfeiting technology. US Patent US5084351 and Chinese Patent ZL02806457.7 disclose the application of optically variable pigments and related pigments prepared by physical steam method in ink field. However, the research of prior art mainly lies in the application of optical variable pigments in the field of anti-counterfeiting. There is still a lack of research on the use of pigments to change color and disappear within a certain period of time to ensure the reuse of writing paper. Especially for people who practice writing, because the paper that has been written once cannot be reused, a large amount of paper is needed, which is not only a great economic burden, but also a great waste of resources. Invention content: [0003] The purpose of the present invention is to over...

AI Technical Summary

Problems solved by technology

However, the research of the prior art mainly lies in the application of optically variable pigments in the field of anti-counterfeiting. There is still a lack of research on the use of pigments to change color and disappear within a certain period of time to ensure the reuse of writing paper.

Especially for those who practice writing, because the paper that has been written once cannot be reused, a large amount of paper is needed, which is not only a great economic burden, but also a great waste of resources