Raise-dust-free chalk having high filling capacity and used for magnetic blackboard

A high-fill, blackboard technology, applied in applications, pencil leads, home appliances, etc., can solve problems such as respiratory tract, lung infection, damage to the physical and mental health of teachers and students, and achieve improved adsorption performance, smooth writing, and adhesion. Good results

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

The main component of ordinary chalk is a white precipitate of calcium sulfate. If the dust is inhaled by teachers and students, it will directly cause respiratory tract and lung infections, cause bronchitis, asthma, pneumonia and other diseases, and harmful substances will flow into the blood vessels. , will cause heart and lung failure, and cause a variety of diseases, which will seriously damage the physical and mental health of teachers and students.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of chalk with no dust and high filling capacity for magnetic blackboard, its raw materials include by weight: 50 parts of gypsum, 40 parts of modified talcum powder, 0.5 part of white carbon black, 4 parts of natural beeswax, 5 parts of glycerin, epoxy silkworm chrysalis oil 13 parts of butyl ester, 2 parts of sodium lauryl phosphate, 1.8 parts of sodium polyacrylate, 0.5 parts of pigment;

[0015] The modified talcum powder is prepared by the following process: put talcum powder, diatomaceous earth, ferric chloride, and ferrous sulfate into water and stir evenly, add sodium bicarbonate solution dropwise until the pH value of the system is 8.5, stir, filter, and dry , to obtain the first prefabricated material; stir cyclodextrin and n-octyltrimethoxysilane evenly, add ethanol solution and mix uniformly, add citric acid to adjust the pH value of the system to 6, and obtain the second prefabricated material; spray the second prefabricated material Pour it onto the ...

Embodiment 2

[0017] A kind of dust-free high-filling chalk for magnetic blackboard, its raw materials include by weight: 100 parts of gypsum, 20 parts of modified talcum powder, 2.5 parts of white carbon black, 2 parts of natural beeswax, 10 parts of glycerin, epoxy silkworm chrysalis oil 8 parts of butyl ester, 4.5 parts of sodium lauryl phosphate, 1 part of sodium polyacrylate, 1.5 parts of pigment;

[0018] Among them, the modified talc powder is prepared by the following process: put talc powder, diatomaceous earth, ferric chloride, and ferrous sulfate into water and stir evenly, add sodium bicarbonate solution dropwise until the pH value of the system is 7.5, stir, filter, and dry , to obtain the first prefabricated material; stir cyclodextrin and n-octyltrimethoxysilane evenly, add ethanol solution and mix uniformly, add citric acid to adjust the pH value of the system to 6.5, and obtain the second prefabricated material; spray the second prefabricated material Pour it onto the first...

Embodiment 3

[0020] A kind of chalk with no dust and high filling capacity for magnetic blackboard, its raw materials include by weight: 60 parts of gypsum, 35 parts of modified talcum powder, 2 parts of white carbon black, 3.5 parts of natural beeswax, 6 parts of glycerin, epoxy silkworm chrysalis oil 11 parts of butyl ester, 3 parts of sodium lauryl phosphate, 1.5 parts of sodium polyacrylate, and 0.8 parts of pigment.

[0021] Wherein the modified talcum powder is prepared by the following process: put 50 parts of talcum powder, 5 parts of diatomaceous earth, 3.5 parts of ferric trichloride, and 1 part of ferrous sulfate into 100 parts of water and stir evenly in parts by weight, and the dropping concentration is 2.5 parts. mol / L sodium bicarbonate solution until the pH value of the system is 8.2, continue to stir for 5h, filter, and dry to obtain the first preform; stir 10 parts of cyclodextrin and 0.5 parts of n-octyltrimethoxysilane evenly, and the stirring temperature to 55°C, add 4...

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PUM

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Abstract

The invention discloses raise-dust-free chalk having high filling capacity and used for a magnetic blackboard. The chalk comprises the following raw materials: gypsum, modified talc powder, white carbon black, natural beeswax, glycerin, epoxy silkworm chrysalis oleic acid butyl ester, sodium dodecyl phosphate, sodium polyacrylate and a pigment, wherein the modified talc powder is prepared with the following process: talc powder, diatomaceous earth, iron(III) chloride and ferrous sulfate are placed in water and stirred uniformly, a sodium bicarbonate solution is added dropwise, the mixture is stirred, filtered and dried, and a first pre-prepared material is obtained; cyclodextrin and trimethoxyoctylsilane are stirred uniformly, an ethanol solution is added and mixed uniformly, citric acid is added to regulate the pH value of the system, and a second pre-prepared material is obtained; the second pre-prepared material is sprayed to the first pre-prepared material, the mixture is stirred and dried, and the modified talc powder is obtained. The chalk writes smooth and clear on dry and wet blackboards and does not slip, falling dust in a writing process can be adsorbed on the surface of the magnetic blackboard, raise dust is avoided, writing is erased with no mark residue, the cost is low, and the chalk is durable.

Description

technical field [0001] The invention relates to the technical field of chalk, in particular to a dust-free high-fill chalk for a magnetic blackboard. Background technique [0002] Chalk is a tool widely used in daily life and is generally used for writing on blackboards. The main component of ordinary chalk is a white precipitate of calcium sulfate. If the dust is inhaled by teachers and students, it will directly cause respiratory tract and lung infections, cause bronchitis, asthma, pneumonia and other diseases, and harmful substances will flow into the blood vessels. , It will cause heart and lung failure and cause various diseases, which will seriously damage the physical and mental health of teachers and students. Contents of the invention [0003] The present invention proposes a non-dusting high-filling chalk for magnetic blackboards, which not only writes smoothly and does not slip on dry and wet blackboards, but also has clear handwriting. Dust, wipe off without ...

Claims

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Application Information

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IPC IPC(8): C09D13/00
CPCC09D13/00
Inventor 不公告发明人
Owner 崇夕山
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