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Neodymium iron boron magnetic chalk

A NdFeB, magnetic technology, applied in pencil leads, household appliances, applications, etc., can solve problems such as health effects, non-discovery, etc., to achieve the effect of fluent writing, clear handwriting, and moderate hardness

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

[0015] The NdFeB magnetic chalk of the present invention is characterized in that: by weight, the material formula is: 3-5 parts of 600-mesh NdFeB magnetic material powder, 15-20 parts of Paris plaster powder, 15-20 parts of large white powder, water 15-20 parts; 3-5 parts of color paste, 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

[0017] The preparation method of NdFeB magnetic 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 3-20 parts of color paste 5 parts, stirred evenly, extruded and dried to obtain NdFeB magnetic chalk embryos; after magnetization treatment by adopting the prior art method, the NdFeB magnetic chalk of the present invention was obtained.

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PUM

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Abstract

The invention discloses neodymium iron boron magnetic chalk. A formula of the chalk is as follows: 3-5 parts of neodymium iron boron magnetic material powder, 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 is matched with an iron blackboard for use, and has the advantages of fluent writing, clear handwriting, moderate hardness and no dust rise.

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 from calcium sulfate hydrate (commonly known as raw gypsum). Various pigments can also be added to 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 mod...

Claims

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Application Information

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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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