Magnetic chalk

Abstract

The invention belongs to the technical field of stationary articles and discloses a magnetic chalk. The magnetic chalk is prepared from the following raw materials in parts by weight: 30-40 parts of calcium carbonate, 10-20 parts of Arabic gum, 5-15 parts of polyethylene glycol and 20-30 parts of pigment. The magnetic chalk disclosed by the invention has the beneficial effects that the raw materials of the product are easy to obtain, the formula is scientific and the cost is low; the magnetic chalk can be used for writing on various boards such as common blackboards and whiteboards; by matching with an electromagnetic type blackboard eraser for use, chalk dust erased can be attracted with the movement of the blackboard eraser, so that the damage of dust flying to the body health of teachers and students in class is avoided.

Description

technical field [0001] The invention belongs to the technical field of stationery, in particular to a magnetic chalk. Background technique [0002] In daily teaching work, teachers generally need to write on the blackboard with chalk. The chalk used for writing on the blackboard usually produces dust when it is erased. Long-term use can cause physical damage to teachers and students that cannot be ignored, especially many people with pharyngitis, Teachers or students with bronchitis or pneumonia will be more seriously ill after inhaling dust, especially for teachers, teaching is a lifelong job, and long-term exposure to chalk dust will do great harm to the teacher's body. Therefore, a kind of dust is developed It is necessary to have a small amount of chalk that is not easy to cause dust when erasing. Contents of the invention [0003] The purpose of the present invention is exactly to invent a kind of chalk with little amount of dust, and it is difficult to cause dust to...

AI Technical Summary

Problems solved by technology

[0002] In daily teaching work, teachers generally need to write on the blackboard with chalk. The chalk used for blackboard writing usually produces dust when it is erased. Long-term use can cause physical damage to teachers and students that cannot be ignored, especially many people with pharyngitis, Teachers or students with bronchitis or pneumonia are more seriously ill after inhaling dust. Especially for teachers, teaching is a lifelong job. Long-term exposure to chalk dust will cause great harm to teachers. Therefore, a dust It is necessary to use chalk with a small amount and not easy to cause dust when erasing