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Healthy and durable chalk

A durable, chalk-based technology, applied in applications, pencil leads, household appliances, etc., can solve environmental and human health hazards, increased proportion of chalk dust, difficult to erase and other problems, to achieve environmental and human health harmless, solubilized Good thickening effect, not easy to drop powder

Inactive Publication Date: 2016-03-30
崇夕山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Dust-free chalk is an improved product of ordinary chalk. It refers to the elimination of chalk dust pollution in classrooms. It just adds oil or polyalcohol to ordinary chalk as a binder, and then adds fillers with a larger specific gravity, such as clay and marl. Rock, cement, etc., increase the proportion of chalk dust, and writing is laborious. In addition, although the water-soluble chalk appears, the dust is small, but it contains a large amount of organic solvents, which is harmful to the environment and human health. remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A healthy and durable chalk, the raw materials of which include by weight: 25 parts of modified gypsum powder, 8 parts of powdered Angelica dahurica, 5 parts of plant ash, 10 parts of diatomaceous earth, 0.2 parts of acid dye, 0.5 parts of flavoring agent and 50 parts of water.

Embodiment 2

[0018] A healthy and durable chalk, the raw materials of which include by weight: 45 parts of modified gypsum powder, 2 parts of powdered Angelica dahurica, 10 parts of plant ash, 2 parts of diatomaceous earth, 1.8 parts of acid dye, 0.2 parts of fragrance agent and 100 parts of water.

Embodiment 3

[0020] A healthy and durable chalk, the raw materials of which include by weight: 30 parts of modified gypsum powder, 6 parts of powdered Angelica dahurica, 6 parts of plant ash, 9 parts of diatomaceous earth, 1 part of acid dye, 0.4 part of fragrance agent and 60 parts of water.

[0021] The preparation method of modified gypsum powder is as follows: Weigh 40 parts of gypsum powder and 5 parts of titanium dioxide in parts by weight and send them to an autoclave for 300 minutes. Dry, add 0.5 parts of tetraethyl orthosilicate, 120 parts of deionized water for stirring, the stirring speed is 3500r / min, the stirring temperature is 90°C, add 1.2 parts of fatty acid sorbitan, 60 parts of mass fraction of 90wt% ethanol solution for ultrasonic Disperse, ultrasonic temperature is 78°C, ultrasonic time is 10min, filter, wash, dry, pulverize to obtain modified gypsum powder.

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PUM

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Abstract

The invention discloses healthy and durable chalk comprising raw materials in parts by weight as follows: 25-45 parts of modified gypsum powder, 2-8 parts of dahurian angelica root powder, 5-10 parts of plant ash, 2-10 parts of diatomite, 0.2-1.8 parts of acid dye, 0.2-0.5 parts of a flavoring agent and 50-100 parts of water. The chalk cannot cause dust easily, is small in specific gravity, capable of facilitating writing, firm and durable, contains no organic solvent and causes no harm to the environment and human bodies.

Description

technical field [0001] The invention relates to the technical field of chalk, in particular to a healthy and durable chalk. Background technique [0002] Dust-free chalk is an improved product of ordinary chalk. It refers to the elimination of chalk dust pollution in classrooms. It just adds oil or polyalcohol to ordinary chalk as a binder, and then adds fillers with a larger specific gravity, such as clay and marl. Rock, cement, etc., increase the proportion of chalk dust, and writing is laborious. In addition, although the water-soluble chalk appears, the dust is small, but it contains a large amount of organic solvents, which is harmful to the environment and human health. remove. Contents of the invention [0003] The invention provides a healthy and durable chalk, which is not easy to drop powder, has small specific gravity, is convenient for writing, is strong and durable, does not contain organic solvents, and is harmless to the environment and human health. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
CPCC09D13/00
Inventor 不公告发明人
Owner 崇夕山
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