Dust-free chalk

A technology of chalk and gypsum powder, which can be applied to pencil lead, household utensils, applications, etc., and can solve problems such as affecting the health of teachers, flying chalk dust, and excellent products

Inactive Publication Date: 2012-06-06
王诚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The teacher used chalk to write on the blackboard during class, and the chalk dust flew up, which seriously affected the teacher's health
At present, ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1, a kind of dust-free chalk is made of the following raw materials with the following weight ratio,

[0012] Calcium carbonate 35.5

[0013] Gypsum powder 35.5

[0014] Color paste 4.5

[0015] Polyvinyl alcohol aqueous solution 2

[0016] Water 29.

[0017] The components are mixed and stirred uniformly and then extruded into a shape. After drying, they are dipped and coated with an aqueous solution of polyvinyl alcohol and dried.

Embodiment 2

[0018] Example 2, a kind of dust-free chalk is made of the following raw materials with the following weight ratio,

[0019] Calcium carbonate 34.0

[0020] Gypsum powder 34.0

[0021] Color paste 3.5

[0022] Polyvinyl alcohol aqueous solution 1.0

[0023] Water 28.5.

Embodiment 3

[0024] Example 3, a kind of dust-free chalk, is made of raw materials with the following weight ratios,

[0025] Calcium carbonate 36.0

[0026] Gypsum powder 36.0

[0027] Color paste 6.5

[0028] Polyvinyl alcohol aqueous solution 3.5

[0029] Water 30.5.

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PUM

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Abstract

The invention relates to dust-free chalk, which is made from the following raw materials: calcium carbonate, gypsum powder, color paste, a polyvinyl alcohol water solution and water. And the chalk is prepared by: mixing and stirring all components uniformly, conducting extrusion molding and drying, then carrying out dip coating with the polyvinyl alcohol water solution, and finally performing drying. Compared with prior art, the chalk of the invention undergoes dip coating and can reach dust-free requirement. The chalk product provided in the invention has the advantages of less dust, legible handwriting and smooth writing.

Description

Technical field [0001] The invention relates to an office article, in particular to a dust-free chalk. Background technique [0002] The teacher used chalk to write on the blackboard during class, and the chalk was dusty, which seriously affected the teacher's health. The so-called dust-free chalk on the market currently produces less chalk ash, but the product is too hard, the writing is not fluent, and the handwriting is not clear. Summary of the invention [0003] The technical problem to be solved by the present invention is to aim at the deficiencies of the prior art and propose a dust-free chalk with fluent writing. [0004] The technical problem to be solved by the present invention is achieved through the following technical solutions. A dust-free chalk is characterized by being made of raw materials with the following weight ratios, [0005] Calcium carbonate 34.0~36.0 [0006] Gypsum powder 34.0~36.0 [0007] Color paste 3.5~6.5 [0008] Polyvinyl alcohol aqueous solution 1.0...

Claims

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Application Information

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IPC IPC(8): C09D13/00
Inventor 王诚
Owner 王诚
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