Black writing liquid suitable for being written on matt board and erasing agent

Abstract

The invention provides black writing liquid suitable for being written on a matt board and an erasing agent. The writing liquid comprises the components of acid No.3 green, acid fuchsin, a dispersing agent, a stabilizer, a plasticizer, sodium citrate and distilled water. The erasing agent comprises the components of a reducing agent, a complexing agent, a dispersing agent, an antioxidant, a solidifying agent, sodium carbonate and distilled water. The black writing liquid suitable for being written on the matt board and the erasing agent have simple formulas, easily obtained raw materials and low costs. The writing liquid is prepared by an anaglyphic principle, has the advantages of no toxicity, no odor, no generation of precipitates after the writing liquid is stored for a long time and the like, is smooth to write, is particularly suitable for being written on the teaching matt board. The erasing agent can be used for rapidly erasing writing written by the writing liquid, and no writing liquid shadow exists.

Description

technical field [0001] The invention relates to ink, in particular to a black writing liquid suitable for writing on a matt plate and an erasing agent thereof. Background technique [0002] The blackboard chalk used in traditional blackboard demonstrations produces serious dust pollution during teaching, which endangers the health of teachers and students. In order to solve this problem, researchers have developed a variety of alternatives to chalk. Among them, whiteboard pen writing liquid has the advantages of smooth writing, easy erasing, and dust-free, and is generally accepted by people and put into large-scale use. However, the whiteboard is easy to reflect light, which will damage the eyesight of students and affect the teaching effect. Although the matte board overcomes the defect that the whiteboard is easy to reflect light, when writing on the matte board with whiteboard writing fluid, most of these writing fluids are easy to penetrate into the matt board and are ...

AI Technical Summary

Problems solved by technology

However, the whiteboard is easy to reflect light, which will damage the eyesight of students and affect the teaching effect

Although the matte board overcomes the defect that the whiteboard is easy to reflect light, when writing on the matte board with whiteboard writing fluid, most of these writing fluids are easy to penetrate into the matt board and are not easy to erase. left with ink shadows