Raise-dust-free chalk having high filling capacity and used for magnetic blackboard

Abstract

The invention discloses raise-dust-free chalk having high filling capacity and used for a magnetic blackboard. The chalk comprises the following raw materials: gypsum, modified talc powder, white carbon black, natural beeswax, glycerin, epoxy silkworm chrysalis oleic acid butyl ester, sodium dodecyl phosphate, sodium polyacrylate and a pigment, wherein the modified talc powder is prepared with the following process: talc powder, diatomaceous earth, iron(III) chloride and ferrous sulfate are placed in water and stirred uniformly, a sodium bicarbonate solution is added dropwise, the mixture is stirred, filtered and dried, and a first pre-prepared material is obtained; cyclodextrin and trimethoxyoctylsilane are stirred uniformly, an ethanol solution is added and mixed uniformly, citric acid is added to regulate the pH value of the system, and a second pre-prepared material is obtained; the second pre-prepared material is sprayed to the first pre-prepared material, the mixture is stirred and dried, and the modified talc powder is obtained. The chalk writes smooth and clear on dry and wet blackboards and does not slip, falling dust in a writing process can be adsorbed on the surface of the magnetic blackboard, raise dust is avoided, writing is erased with no mark residue, the cost is low, and the chalk is durable.

Description

technical field [0001] The invention relates to the technical field of chalk, in particular to a dust-free high-fill chalk for a magnetic blackboard. Background technique [0002] Chalk is a tool widely used in daily life and is generally used for writing on blackboards. The main component of ordinary chalk is a white precipitate of calcium sulfate. If the dust is inhaled by teachers and students, it will directly cause respiratory tract and lung infections, cause bronchitis, asthma, pneumonia and other diseases, and harmful substances will flow into the blood vessels. , It will cause heart and lung failure and cause various diseases, which will seriously damage the physical and mental health of teachers and students. Contents of the invention [0003] The present invention proposes a non-dusting high-filling chalk for magnetic blackboards, which not only writes smoothly and does not slip on dry and wet blackboards, but also has clear handwriting. Dust, wipe off without ...

AI Technical Summary

Problems solved by technology

The main component of ordinary chalk is a white precipitate of calcium sulfate. If the dust is inhaled by teachers and students, it will directly cause respiratory tract and lung infections, cause bronchitis, asthma, pneumonia and other diseases, and harmful substances will flow into the blood vessels. , will cause heart and lung failure, and cause a variety of diseases, which will seriously damage the physical and mental health of teachers and students.