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Chalk

A technology of chalk and powder, which is applied in the field of environmental protection cultural and educational supplies, can solve problems such as chalk dust pollution, and achieve the effect of eliminating dust pollution

Inactive Publication Date: 2011-06-22
SHANGHAI CITY CHANGNING DISTRICT JUNIOR SCI &TECH GUIDANCE STATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of chalk, to thoroughly solve the dust pollution problem of chalk

Method used

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Embodiment Construction

[0010] In order to make the purpose and features of the present invention more obvious and understandable, the specific implementation manners of the present invention will be further described below.

[0011] The core idea of ​​the present invention is that by adding powdered leuco dye and color developer dissolved in wax, after writing, touch the written word with a special hot blackboard eraser, so that the leuco dye and color developer melt and react Forms black dye of the same color as the blackboard, thereby realizing the erasure of written characters without generating dust.

[0012] The main component of the chalk of the present invention also includes leuco dye and developer except calcium carbonate and calcium sulfate. The leuco dye and developer are separately dissolved in wax and form a powder. Specifically, the leuco dye and the developer were dissolved in wax respectively, and then dispersed into very fine powders and uniformly mixed in calcium carbonate and cal...

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Abstract

The invention discloses a chalk. A leuco dye and a color-developing agent which are powdered and are dissolvable in wax are added, and have no any influence on writing on a blackboard, but a special hot blackboard eraser is contacted with written characters after writing, so that the leuco dye and the color-developing agent are molten and react with each other to form a black dye in the same color as the blackboard. Therefore, the written characters are erased on the basis of no generation of any dust, and the dust pollution of the chalk is eliminated.

Description

technical field [0001] The invention relates to the technical field of environmental protection cultural and educational supplies, in particular to a kind of chalk. Background technique [0002] At present, domestically used chalk mainly contains two kinds of common chalk and dust-free chalk. The main components of ordinary chalk include calcium carbonate and calcium sulfate. In addition, ordinary chalk can also contain a small amount of calcium oxide. However, when erasing the words written with ordinary chalk, a large amount of dust will be produced, which will seriously affect the quality of teaching, and these dusts will harm the respiratory system, skin and eyes of the human body, seriously damaging the health of teachers and students. For this reason, dust-free chalk has occurred both at home and abroad. Dust-free chalk is an improved product of ordinary chalk, which aims to eliminate the dust pollution of chalk in the classroom. It just adds grease or polyalcohols...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
Inventor 沈惠宁
Owner SHANGHAI CITY CHANGNING DISTRICT JUNIOR SCI &TECH GUIDANCE STATION
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