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Dustless colored chalk dedicated for whiteboard capable of fading chemically

A color chalk, whiteboard technology, applied in the application, pencil lead, household utensils and other directions, can solve the problem of poor writing length and other problems, to achieve the effect of unique formula, easy to break off slag, easy to clean

Active Publication Date: 2013-02-06
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing chalk, the writing length is not good, and there will still be some dust when erasing, so there is still a gap in chemical erasing and fading

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1, the preparation of the special dust-free red chalk for whiteboards that can be chemically faded:

[0016] Measure 7.92ml of tap water, add 0.72g of emulsifying wax and start heating, after the emulsifying wax is completely dissolved, add 1.92g of stearic acid and 0.48g of soluble starch, stir well, then add 0.96g of acid fuchsin, stir to make the color uniform , add 0.22g castor oil, and finally add 10.32g gypsum powder, pour it into the mold after stirring, and take out the sample after it cools down.

[0017] After testing, the above-mentioned traces of chalk can be easily erased by using the eraser described in the patent CN101709174A.

Embodiment 2

[0018] Embodiment 2, the preparation of the special dust-free blue chalk for whiteboards that can be chemically faded:

[0019] Measure 9.12ml of tap water, add 0.96g of emulsifying wax and start heating, after the emulsifying wax is completely dissolved, add 2.16g of stearic acid and 0.72g of soluble starch, stir well, then add 1.44g of methylene blue, stir to make the color uniform , add 0.36g castor oil, and finally add 11.52g gypsum powder, pour it into the mold after stirring, and take out the sample after it cools down.

[0020] After testing, the above-mentioned traces of chalk can be easily erased by using the eraser described in the patent CN101709174A.

Embodiment 3

[0021] Embodiment 3, the preparation of the special dust-free green chalk for whiteboards that can be chemically faded:

[0022] Measure 8.40ml of tap water, add 0.86g of emulsifying wax and start heating, after the emulsifying wax is completely dissolved, add 2.02g of stearic acid and 0.65g of soluble starch, stir well, then add 1.08g of acid green, stir to make the color uniform, Add 0.22g of castor oil, and finally add 10.80g of gypsum powder, pour it into the mold after stirring, and take out the sample after it cools down.

[0023] After testing, the above-mentioned traces of chalk can be easily erased by using the eraser described in the patent CN101709174A.

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PUM

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Abstract

The invention relates to a dustless colored chalk dedicated for a whiteboard capable of fading chemically, which comprises the components of land plaster, water, a plasticizer, binder, emulsifying wax, dye and a flavouring agent. The dustless colored chalk dedicated for the whiteboard capable of fading chemically has the advantages of unique formula and simplicity and convenience for preparation, has the writing function of a colored chalk, and can be erased by using an erasing agent in the patent for invention CN101709174A. The dustless colored chalk can be used for writing on the whiteboard smoothly, has better writing effect than that of a traditional chalk and is similar to a crayon, overcomes the defect that the traditional chalk is easy to break and drop dregs, and is cheaper and more durable than the crayon.

Description

technical field [0001] The invention relates to a writing instrument, in particular to a special dust-free color chalk for white boards which can be chemically faded. Background technique [0002] In modern teaching aids, whiteboard markers have replaced chalk writing to a certain extent due to their easy-to-erasable and dust-free features, but the development of whiteboard markers has not been very smooth. Moreover, there are many problems to be solved urgently in erasable whiteboard markers, especially the non-degradability of some pigments and the use of a large amount of organic solvents in the ink, which are harmful to the environment and human health. Therefore, it is of great significance to study a more environmentally friendly and economical writing tool. The production process of traditional chalk is very simple, and the formula is relatively simple, that is, gypsum powder and water are mixed in a certain proportion. Traditional chalk is honeycomb-shaped, easy to...

Claims

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Application Information

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IPC IPC(8): C09D13/00
Inventor 董川于洋游志校李丽霞
Owner SHANXI UNIV
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