Green, environment-friendly and dust-free chalk

A green, environmentally friendly, chalk technology, used in pencil leads, household appliances, applications, etc., can solve problems such as non-discovery and health effects, and achieve the effect of clear handwriting, less dust, and less dust flying.

Active Publication Date: 2013-12-25
桐乡宏晨工业设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

its health impact
[0003] After searching for Chinese published patents, no solution identical to this patent application was found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The green environmental protection dust-free chalk of the present invention is characterized in that: by weight, the material formula is: 15-20 parts of plaster of paris powder, 15-20 parts of large white powder, 15-20 parts of water; 3-5 parts of color paste, all The color paste is an aqueous solution consisting of 2-5 parts of polyvinyl acetate emulsion, 2-3 parts of polyvinyl alcohol and 50 parts of water.

Embodiment 2

[0015] The preparation method of the green environmental protection dust-free chalk of the present invention is characterized in that: by weight, after mixing 15-20 parts of plaster powder and 15-20 parts of large white powder, add 15-20 parts of water and stir evenly; add color paste 3-20 parts 5 parts, after being evenly stirred, extruded and dried to obtain the green environmental protection dust-free chalk of the present invention.

[0016] The green, environment-friendly and dust-free chalk of the present invention has the characteristics of fluent writing, clear handwriting, moderate hardness, little dust and is not easy to fly, and the like.

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PUM

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Abstract

The invention discloses green, environment-friendly and dust-free chalk. A formula of the chalk is as follows: 15-20 parts of burnt gypsum powder, 15-20 parts of large white powder, 15-20 parts of water, and 3-5 parts of color paste, wherein the color paste is an aqueous solution comprising 2-5 parts of polyvinyl acetate emulsion, 2-3 parts of polyvinyl alcohol and 50 parts of water. The chalk has the characteristics that the chalk is fluent in writing, clear in handwriting, moderate in hardness and less in dust, and the dust does not rise easily.

Description

technical field [0001] The invention belongs to a kind of chalk. Background technique [0002] Chalk is a tool widely used in daily life and is generally used for writing on blackboards. Ancient chalk was usually made of natural chalk, but nowadays it is replaced by other substances. The composition of chalk is a white precipitate of calcium sulfate, which is not easily decomposed, and the particles are larger than dust. Now, domestic chalk mainly contains two kinds of common chalk and dust-free chalk, and its main component is calcium carbonate (limestone) and calcium sulfate (gypsum), or contains a small amount of calcium oxide. chalk is made of Calcium sulfate Hydrate (commonly known as raw gypsum). Various pigment Make colored chalk. During the production process, the raw gypsum is heated to a certain temperature to partially dehydrate it into mature gypsum, and then the plaster of paris is mixed with water to form a paste, poured into the model and solidified. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D13/00
Inventor 龙启知李杰严积芳严亚木黄景诚
Owner 桐乡宏晨工业设计有限公司
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