Dust-free chalk
A kind of chalk, the following technology is applied in the field of manufacturing chalk for cultural and educational supplies, which can solve the problems of high production cost and unsatisfactory effect, and achieve the effect of low production cost, good use effect and reasonable formula
Inactive Publication Date: 2019-01-04
刘若慧
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, only a few areas such as Beijing, Shanghai, and Zhejiang produce dust-free chalk in China; but the effect is not ideal and the production cost is high
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0011] A dust-free chalk is composed of the following components by weight: 23 parts of calcium carbonate, 65 parts of plaster, 12 parts of magnesium oxide, 1.5 parts of polyvinyl alcohol, 1 part of glycerin, 3.5 parts of white oil, 2 parts of color paste, 115 parts of water.
Embodiment 2
[0013] A dust-free chalk consists of the following components by weight: 25 parts of calcium carbonate, 61 parts of plaster, 11 parts of magnesium oxide, 1.8 parts of polyvinyl alcohol, 1.5 parts of glycerin, 4 parts of white oil, 2.4 parts of color paste, 120 parts of water.
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The invention provides dust-free chalk. The chalk comprises, by weight, 20-25 parts of calcium carbonate, 60-70 parts of calcined gypsum, 10-12 parts of magnesium oxide, 1-2 parts of polyvinyl alcohol, 1-2 parts of glycerol, 3-4 parts of white oil, 1.5-2.5 parts of color paste and 100-120 parts of water. The chalk is reasonable in formula, great in use effect and low in production cost.
Description
technical field [0001] The invention belongs to the manufacturing technology of stationery chalk. Dust-free chalk should be called micro-dust chalk scientifically. Background technique [0002] The teacher writes on the blackboard with chalk on the blackboard during class, and the chalk dust flies, seriously affecting the health of the teacher. [0003] In recent years, a new product of "dust-free chalk" has appeared abroad, which has generated strong repercussions in the education sector and has been highly valued. In fact, from a scientific point of view, absolute dust-free chalk is impossible, because chalk blackboard writing is covered by dust to present handwriting, so the meaning of dust-free chalk means that its dust content is higher than that of ordinary chalk. volume is greatly reduced. In order to achieve the purpose of improving the working environment of teachers and benefiting the health of teachers and students. At present, my country has only a few areas ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C09D13/00
CPCC09D13/00
Inventor 不公告发明人
Owner 刘若慧