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Colored dust-free chalk capable of fading automatically and preparation method thereof

A color and automatic technology, applied in the field of chalk for teaching and its preparation, can solve the problems that handwriting cannot be automatically faded, the user's health is unfavorable, the molecular binding force is weak, etc., and the effect of smooth writing, not easy to fall off, and bright colors can be achieved.

Active Publication Date: 2013-05-01
山西奇色环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The chalk used for teaching and writing for a long time is basically composed of calcium sulfate and calcium carbonate with fine particles and weak molecular binding force, so there will be dust pollution problems during use, which is not good for the health of users
Most of the existing dust-free chalks and dust-free colored chalks are improved traditional formulas, the handwriting cannot be automatically faded, and there are residues after erasing, which is not friendly to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: prepare red chalk

[0010] Components: sodium thiosulfate 8g, sodium carbonate 0.352g, phenolphthalein 1.28g, talcum powder 0.5g, carboxymethylcellulose sodium 0.1g, sodium metasilicate nonahydrate 2g.

[0011] Preparation method: mix phenolphthalein and sodium carbonate, add absolute ethanol dropwise to a thick paste, pour molten sodium thiosulfate and sodium metasilicate nonahydrate into it and stir evenly, then add talcum powder and carboxymethyl cellulose Sodium and stir evenly, pour into the mold, dry in the air, take it out, soak it with 10% polyvinylpyrrolidone absolute ethanol solution for one minute and cover the film, take it out and dry it.

[0012] Effect: The chalk has high chroma, good coverage, moderate softness and hardness, and can withstand a temperature of 45°C. The handwriting fades in 2 hours in rainy weather and 2 days in dry weather.

Embodiment 2

[0013] Embodiment 2: prepare yellow chalk

[0014] Components: sodium thiosulfate 8g, sodium carbonate 0.368g, m-nitrophenol 1.28g, talcum powder 1g, sodium carboxymethylcellulose 0.1g, sodium metasilicate nonahydrate 1.8g.

[0015] Preparation method: mix m-nitrophenol and sodium carbonate, add absolute ethanol dropwise to a thick paste, pour molten sodium thiosulfate and sodium metasilicate nonahydrate into it and stir evenly, then add talc powder and carboxymethyl Base cellulose sodium and stir evenly, pour into the mold, dry, soak with 10% polyvinylpyrrolidone absolute ethanol solution for one minute and cover the film after taking it out, take it out and dry it.

[0016] Effect: The chalk has high chroma, good coverage, moderate softness and hardness, and can withstand a temperature of 45°C. The handwriting fades in 2 hours in rainy weather and 2 days in dry weather.

Embodiment 3

[0017] Embodiment 3: prepare orange chalk

[0018] Components: 8g of sodium thiosulfate, 0.355g of sodium carbonate, 0.7g of phenolphthalein, 0.66g of m-nitrophenol, 1g of talc, 0.1g of sodium carboxymethylcellulose, and 1.5g of sodium metasilicate nonahydrate.

[0019] Preparation method: mix phenolphthalein, m-nitrophenol and sodium carbonate, add absolute ethanol dropwise to adjust to a thick paste, pour molten sodium thiosulfate and sodium metasilicate nonahydrate into it and stir evenly, add talcum powder and Sodium carboxymethyl cellulose and stir evenly, pour into the mould, dry, soak with 10% polyvinylpyrrolidone absolute ethanol solution for one minute and cover the film after taking it out, take it out and dry it.

[0020] Effect: The chalk has high chroma, good coverage, moderate softness and hardness, and can withstand a temperature of 45°C. The handwriting fades in 2 hours in rainy weather and 2 days in dry weather.

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Abstract

The invention provides a piece of colored dust-free chalk capable of fading automatically and a preparation method thereof. The chalk comprises the raw materials in parts by mass as follows: 60-75 parts of sodium thiosulfate, 12-16 parts of a color developing agent, 3-9 parts of talcum powder, 0.6-1.0 part of sodium carboxymethylcellulose and 10-20 parts of sodium metasilicate nonahydrate, wherein the color developing agent comprises sodium carbonate and an acid-base indicator. The preparation method of the dust-free chalk comprises the steps that the acid-base indicator and sodium carbonate are mixed; absolute ethyl alcohol is added dropwise until the mixture becomes a heavy paste; melted sodium thiosulfate and sodium metasilicate nonahydrate are poured into the mixture and mixed uniformly; and the talcum powder and sodium carboxymethylcellulose are added, stirred uniformly, filled into a mold, aired, and covered by a film, so that the chalk is obtained. The colored dust-free chalk can fade automatically, and is environment-friendly, non-poisonous, unsticky and dust-free.

Description

Technical field [0001] The invention relates to a chalk for teaching and a preparation method thereof. Background technique [0002] The chalk used for teaching and writing for a long time is basically composed of calcium sulfate and calcium carbonate with fine particles and weak molecular binding force. Therefore, dust pollution will occur during use, which is not good for the health of users. Most of the existing dust-free chalks and dust-free colored chalks are improved traditional formulas, and the handwriting cannot be automatically removed, and there are residues after erasing, which is not friendly to the environment. Contents of the invention [0003] The object of the present invention is to provide a color dust-free chalk that can automatically fade, is environmentally friendly, non-toxic, does not stick to hands, and is dust-free. [0004] A kind of color dust-free chalk that can automatically fade provided by the present invention, its component and its conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
Inventor 董川游志校翟晓倩苏丽霞于洋张建刚王晓丽李丽霞周叶红
Owner 山西奇色环保科技股份有限公司
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