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Fadable coloured chalk for white board

A technology of colored chalk and whiteboard, applied in applications, pencil leads, household utensils, etc., can solve problems such as hard to erase, hard to fade handwriting, etc., to achieve clear handwriting and smooth writing

Inactive Publication Date: 2013-05-01
SHIJIAZHUANG KEDA STATIONERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A variety of new types of chalk appearing at present, although the colors are diverse and easy to write, the handwriting is not easy to fade and difficult to erase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation of embodiment 1, blue chalk:

[0015] Weigh 0.6 grams of methyl blue and red, add 1.0 grams of glycerin, stir and moisten, add 8.36 grams of emulsified wax, heat to 90 ° C, stir to make it completely melted, then gradually add 1.34 grams of polyethylene glycol, 3.0 grams of talc, 0.3 grams of Sodium polyacrylate was melted separately, stirred evenly, and finally 4.18 grams of stearic acid and 0.5 gram of white carbon black were added and stirred evenly. Cool slightly and then pour into the mold, take out the sample after it is completely cooled and set.

Embodiment 2

[0016] The preparation of embodiment 2, red chalk:

[0017] Weigh 0.4 g of acid fuchsin, add 1.0 g of glycerin, stir and moisten, add 8.40 g of emulsified wax, heat to 90 °C, stir to melt completely, then gradually add 1.40 g of polyethylene glycol, 3.0 g of talc, 0.3 g of poly Sodium acrylate was melted respectively and stirred evenly, and finally 4.20 grams of stearic acid and 0.5 gram of white carbon black were added and stirred evenly. Cool slightly and then pour into the mold, take out the sample after it is completely cooled and set.

Embodiment 3

[0018] Embodiment 3, the preparation of green chalk:

[0019] Weigh 0.4 g of Acid No. 3 Green, add 1.0 g of glycerin and stir to wet it, then add 8.36 g of emulsified wax and heat to 90°C, stir to make it completely melted, then gradually add 1.34 g of polyethylene glycol, 3.0 g of talcum powder, 0.3 gram of sodium polyacrylate, respectively melted, stirred evenly, finally added 4.18 gram of stearic acid and 0.5 gram of white carbon black and stirred evenly. Cool slightly and then pour into the mold, take out the sample after it is completely cooled and set.

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PUM

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Abstract

The invention provides a fadable coloured chalk for a white board and a preparation method thereof. The coloured chalk comprises the following raw materials in part by mass: 40-45 parts of emulsifying wax, 20-25 parts of stearic acid, 14-18 parts of talcum powder, 6-10 parts of polyethylene glycol, 1-2 parts of sodium polyacrylate, 2-4 parts of colour former, 5-6 parts of glycerol and 0.6-0.8 part of white carbon black, wherein the colour former is one or more of methyl blue, acid fuchsin and No. 3 acid green. According to the invention, the preparation method for the coloured chalk is simple, the prepared coloured chalk can write on the white board smoothly, the writing is legible and the coloured chalk can fade by erasion of an erasing agent without any trace, and the coloured chalk has no stimulation effect on skin and is environment-friendly.

Description

technical field [0001] The invention relates to a writing instrument, in particular to a fading colored chalk for a whiteboard. Background technique [0002] In modern teaching, although water-soluble chalk and whiteboard markers have replaced traditional chalk to a certain extent, their development has not been very smooth. The non-degradability of certain pigments and the use of a large amount of organic solvents in inks have certain hazards to the environment and human health. The multiple novel chalks that occur at present, though colorful and easy to write, its handwriting is not easy to fade, is difficult to erase. Contents of the invention [0003] The object of the present invention is to provide a kind of fadeable colored chalk for whiteboard. The chalk writes smoothly and clearly on the whiteboard, can be faded by erasing with an eraser, has no stimulating effect on the skin, and is environmentally friendly. [0004] A kind of fading color chalk for white board...

Claims

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Application Information

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IPC IPC(8): C09D13/00
Inventor 周叶红李丽霞何玉良董川
Owner SHIJIAZHUANG KEDA STATIONERY
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