Green ink capable of fading by hydrolyzing and preparation method thereof

Abstract

The invention provides green ink capable of fading by hydrolyzing and a preparation method thereof. The green ink comprises the following components in percent by weight: 1%-5% of p-nitrophenol, 1%-6% of sodium hydroxide, 80%-92% of water, 1%-5% of urea, 1%-4% of glycerol, 0.1%-1% of formaldehyde, 0.05%-0.5% of hydroxyethyl cellulose, 0.5%-3% of fatty alcohol-polyoxyethylene ether sodium sulfate, 0.5%-5% of thymolphthalein blue complexing agent, and 0.5%-3% of triethanolamine. The ink can be quickly faded to be colorless while meeting water under a neutral condition, can be used as ink for white board teaching and writing, and also can be used as writing and drawing ink for children. The ink disclosed by the invention is easy in obtaining materials, simple in preparation method, bright in color, long in color holding time; and handwriting can be directly erased out by water without marks, so that board surface is not contaminated.

Description

technical field [0001] The invention relates to stationery for teaching, in particular to writing materials, in particular to a hydrolyzable and fadeable green ink and a preparation method thereof. Background technique [0002] The safety of teaching stationery directly affects the health of teachers, students and users, and inferior writing ink has a great impact on the physical development of young children. The inks currently on the market have some defects in varying degrees: if some inks use couplers that are mostly soluble in ethanol, but have little solubility in water, so the proportion of ethanol solvent used in the formula is relatively high. Although this type of ink can also be hydrolyzed and faded after writing, its hydrolyzed products cannot be dissolved in water, and can form colorless precipitates that are stained on the whiteboard. If you write again, traces will appear again soon, and it is difficult to clean the paint on the hands of the writer. Some ink...

AI Technical Summary

Problems solved by technology

At present, there are some defects in the inks sold in the market in different degrees: if some inks use color couplers, most of them are easily soluble in ethanol, but the solubility in water is very small, so the proportion of ethanol solvent used in the formula is relatively high

Some inks can be wiped clean, but the color retention time is short after writing, and the handwriting cannot be retained for a long time. This phenomenon is more obvious in the south or in seasons with high humidity, so there are great disadvantages in use