CN103468062A - Neodymium iron boron magnetic chalk - Google Patents
Neodymium iron boron magnetic chalk Download PDFInfo
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- CN103468062A CN103468062A CN2013103864434A CN201310386443A CN103468062A CN 103468062 A CN103468062 A CN 103468062A CN 2013103864434 A CN2013103864434 A CN 2013103864434A CN 201310386443 A CN201310386443 A CN 201310386443A CN 103468062 A CN103468062 A CN 103468062A
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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
The invention belongs to a kind of chalk.
Background technology
Chalk is the instrument widely used in daily life, is generally used for book and writes on the blackboard.The chalk in ancient times is made with natural chalk usually, but multiplex other material replaces now.The composition of chalk is a kind of white depositions of calcium sulfate, is not easy to be decomposed, and particle is larger than dust.Now, the chalk of domestic use mainly contains two kinds of common chalk and dust-free chalks, and its main component is calcium carbonate (Wingdale) and calcium sulfate (gypsum), or containing a small amount of calcium oxide.Chalk is to be made by the hydrate of calcium sulfate (being commonly called as plaster stone).Also can add various pigment to make pastel.In making processes, plaster stone is heated to certain temperature, makes its partial dehydration age gypsum, then the plaster of Paris is added to water and stir into pasty state, pour into model and solidify and form.The reaction of plaster stone age gypsum is (need heating): it is (normal temperature gets final product) that the 2CaSO42H2O=2CaSO4H2O+3H2O plaster of Paris adds the reaction that water becomes plaster stone: 2CaSO4H2O+3H2O=2CaSO42H2O teacher often need write, draw and explained on blackboard.In a class of 45～50 minutes, will erasable several, lower class hour, often on hand, on sleeve, even all stay one deck white chalk dust on hair, shoulder.Everyday like this, year after year, after working 20～30 years, worn down ten hundreds of chalks.Inevitably from nostril, suck some chalk dusts.Whether suck chalk dust and cause a disease, be the problem that numerous teachers are most deeply concerned.Chalk is made by gypsum.The composition of gypsum is calcium sulfate.The gypsum stable performance, nontoxic.For thousands of years, in medical plaster stone (the calcium sulfate CaSO--42H2O that contains crystal water) decoction, external application plaster of paris (plaster of Paris) applies affected part.Thinking can be refrigerant analgesic, promote the production of body fluid to quench thirst, and promoting tissue regeneration and ulcer healing.Using the chalk-writing writing on the blackboard, is that gypsum powder is coated on blackboard.During blackboard wiping, near fall after of short duration waving in air object plane blackboard and on the ground of gypsum dust (chalk dust).Its particle is larger, how more than 100 microns, heavier, falls comparatively fast, and the time of aloft floating is short.According to the labour hygiene pertinent data, production, the airborne dust particle of living environment, diameter, person more than 10～20 microns, is inhaled majority in time and is stopped by vibrissa, nose, pharynx, throat through nostril, be attached to mucous membrane small airway and alveolar.If the harmful material (as silicon-dioxide, asbestos) to body accumulates morely in alveolar and small airway, will cause damage to human body.From the above, the particle of chalk dust is larger, scarcely can be drawn into lower respiratory tract, adds that again gypsum itself is nontoxic to human body, and medical circle also there is no the report that causes pulmonary disorder because sucking chalk dust so far.China labour hygiene department, in the relevant regulations of professional pneumoconiosis, the also cause of disease using chalk dust as lung not.Although chalk dust there is no large evil to human body, however the millions of teacher of China, and all will do writing on the blackboard with chalk every day, all lives in every day in the chalk dust after blackboard wiping, still can cause nose, pharynx, throat's discomfort.There is the deficiency of healthy effect in it.
Through Chinese publication retrieval, do not find the scheme identical with present patent application.
Summary of the invention:
The object of the invention is to; A kind of neodymium iron boron magnetic chalk is proposed.
Neodymium iron boron magnetic chalk of the present invention is characterized in that: by weight, material formula is: neodymium-iron-boron magnetic material powder 3-5 part, gesso 15-20 part, chalk powder 15-20 part, water 15-20 part; Mill base 3-5 part, described mill base is by polyvinyl acetate emulsion 2-5 part, polyvinyl alcohol 2-3 part, the aqueous solution that water is 50 parts.
Neodymium iron boron magnetic chalk preparation method of the present invention: it is characterized in that: by weight, by gesso 15-20 part, chalk powder 15-20 part adds water 15-20 part and stirs after mixing; Add mill base 3-5 part, after stirring, extrusion molding, drying obtains neodymium iron boron magnetic chalk embryo; After adopting art methods to magnetize to process, both neodymium iron boron magnetic chalk of the present invention.
Operation instruction: neodymium iron boron magnetic chalk of the present invention is to be used in conjunction with the irony blackboard.
Neodymium iron boron magnetic chalk of the present invention, be used in conjunction with the irony blackboard, have write smoothly, writing is clear, hardness is moderate, the advantage of dispersing without dust.
Described neodymium-iron-boron magnetic material; Be neodymium, the alloy of ferric oxide etc., claim again magnet steel.As the latest result of rare earth permanent-magnetic material development, because its excellent magnetic property is called as " magnetic king ".Neodymium iron boron has high magnetic energy product and strong power, the advantage of high-energy-density is applied widely Nd-Fe-Bo permanent magnet material in modern industry and electronic technology simultaneously, thereby makes miniaturization, lightweight, the slimming of the equipment such as instrument, electroacoustic motor, magnetic separation magnetization become possibility.Neodymium iron boron is divided into two kinds of sintered NdFeB and Agglutinate neodymium-iron-borons, and the Agglutinate neodymium-iron-boron all directions all are magnetic, corrosion-resistant; And sintered NdFeB is because of perishable, surface needs coating, and zinc-plated, nickel, zinc electroplating bath, environmental protection nickel, ambrose alloy nickel, environmental protection ambrose alloy nickel etc. are generally arranged.And sintered NdFeB axially magnetizes and radial magnetizing in general minute, it is fixed according to needed working face, to come.
The present invention compared with prior art its beneficial effect is: have with the irony blackboard and be used in conjunction with, have write smoothly, writing is clear, hardness is moderate, the advantage of dispersing without dust.
Concrete embodiment:
Below in conjunction with embodiment, the invention will be further described, but embodiments of the present invention are not limited to this.
Neodymium iron boron magnetic powder of the present invention, raw materials usedly buy acquisition.
Embodiment 1
Neodymium iron boron magnetic chalk of the present invention is characterized in that: by weight, material formula is: 600 purpose neodymium-iron-boron magnetic material powder 3-5 parts, gesso 15-20 part, chalk powder 15-20 part, water 15-20 part; Mill base 3-5 part, described mill base is by polyvinyl acetate emulsion 2-5 part, polyvinyl alcohol 2-3 part, the aqueous solution that water is 50 parts.
Embodiment 2
Neodymium iron boron magnetic chalk preparation method of the present invention: it is characterized in that: by weight, by gesso 15-20 part, chalk powder 15-20 part adds water 15-20 part and stirs after mixing; Add mill base 3-5 part, after stirring, extrusion molding, drying obtains neodymium iron boron magnetic chalk embryo; After adopting art methods to magnetize to process, both neodymium iron boron magnetic chalk of the present invention.
Operation instruction: neodymium iron boron magnetic chalk of the present invention is to be used in conjunction with the irony blackboard.
Neodymium iron boron magnetic chalk of the present invention, be used in conjunction with the irony blackboard, have write smoothly, writing is clear, hardness is moderate, the advantage of dispersing without dust.
Claims (2)
1. a neodymium iron boron magnetic chalk, it is characterized in that: by weight, material formula is: neodymium-iron-boron magnetic material powder 3-5 part, gesso 15-20 part, chalk powder 15-20 part, water 15-20 part; Mill base 3-5 part, described mill base is by polyvinyl acetate emulsion 2-5 part, polyvinyl alcohol 2-3 part, the aqueous solution that water is 50 parts.
2. a neodymium iron boron magnetic chalk preparation method: it is characterized in that: by weight, by gesso 15-20 part, chalk powder 15-20 part adds water 15-20 part and stirs after mixing; Add mill base 3-5 part, after stirring, extrusion molding, drying obtains neodymium iron boron magnetic chalk embryo; After adopting art methods to magnetize to process, both neodymium iron boron magnetic chalk of the present invention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310386443.4A CN103468062B (en) | 2013-08-30 | 2013-08-30 | Neodymium iron boron magnetic chalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310386443.4A CN103468062B (en) | 2013-08-30 | 2013-08-30 | Neodymium iron boron magnetic chalk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103468062A true CN103468062A (en) | 2013-12-25 |
| CN103468062B CN103468062B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310386443.4A Active CN103468062B (en) | 2013-08-30 | 2013-08-30 | Neodymium iron boron magnetic chalk |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105440808A (en) * | 2015-12-30 | 2016-03-30 | 崇夕山 | Low-cost and dust-free chalk |
| CN105440809A (en) * | 2015-12-30 | 2016-03-30 | 崇夕山 | Dust-free chalk capable of facilitating writing and preparation method of chalk |
| CN105440810A (en) * | 2015-12-30 | 2016-03-30 | 崇夕山 | Dust-free chalk |
| CN105462367A (en) * | 2015-12-30 | 2016-04-06 | 崇夕山 | Flying-dust-free erasable chalk |
| CN105505009A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Environment-friendly raise dust-free chalk |
| CN105505008A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | High-filling dustless chalk |
| CN105505006A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Green and healthy chalk for magnetic blackboard |
| CN105505007A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Chalk for magnetic blackboard |
| CN105505005A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Low-cost and flying-dust-free chalk for magnetic blackboard |
| WO2017116995A1 (en) | 2015-12-28 | 2017-07-06 | The Trustees Of Princeton University | Self-erasing chalkboard |
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| CN85106172A (en) * | 1985-08-14 | 1987-03-04 | 王凤楼 | Magnetic chalk and magnetic blackboard eraser |
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| KR20110047903A (en) * | 2009-10-31 | 2011-05-09 | 한국세라믹기술원 | Environment-friendly chalk with high strength, manufacturing method thereof and extruder for manufacturing the chalk |
| WO2011141936A1 (en) * | 2010-05-13 | 2011-11-17 | Kores (India) Limited | A novel dustless chalk and process of making the same |
| CN102399477A (en) * | 2010-09-09 | 2012-04-04 | 徐长斌 | Dust-free chalk |
| CN102485815A (en) * | 2010-12-06 | 2012-06-06 | 王诚 | Dust-free chalk |
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- 2013-08-30 CN CN201310386443.4A patent/CN103468062B/en active Active
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| CN85106172A (en) * | 1985-08-14 | 1987-03-04 | 王凤楼 | Magnetic chalk and magnetic blackboard eraser |
| CN1046746A (en) * | 1989-04-29 | 1990-11-07 | 刘凤义 | Film enveloped chalk is made liquid |
| KR20110047903A (en) * | 2009-10-31 | 2011-05-09 | 한국세라믹기술원 | Environment-friendly chalk with high strength, manufacturing method thereof and extruder for manufacturing the chalk |
| WO2011141936A1 (en) * | 2010-05-13 | 2011-11-17 | Kores (India) Limited | A novel dustless chalk and process of making the same |
| CN102399477A (en) * | 2010-09-09 | 2012-04-04 | 徐长斌 | Dust-free chalk |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017116995A1 (en) | 2015-12-28 | 2017-07-06 | The Trustees Of Princeton University | Self-erasing chalkboard |
| CN105440808A (en) * | 2015-12-30 | 2016-03-30 | 崇夕山 | Low-cost and dust-free chalk |
| CN105440809A (en) * | 2015-12-30 | 2016-03-30 | 崇夕山 | Dust-free chalk capable of facilitating writing and preparation method of chalk |
| CN105440810A (en) * | 2015-12-30 | 2016-03-30 | 崇夕山 | Dust-free chalk |
| CN105462367A (en) * | 2015-12-30 | 2016-04-06 | 崇夕山 | Flying-dust-free erasable chalk |
| CN105505009A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Environment-friendly raise dust-free chalk |
| CN105505008A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | High-filling dustless chalk |
| CN105505006A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Green and healthy chalk for magnetic blackboard |
| CN105505007A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Chalk for magnetic blackboard |
| CN105505005A (en) * | 2015-12-30 | 2016-04-20 | 崇夕山 | Low-cost and flying-dust-free chalk for magnetic blackboard |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103468062B (en) | 2015-04-22 |
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Address after: 542800 the Guangxi Zhuang Autonomous Region Hezhou City eight step Xiyuan No. 40 Lane eight new materials research and Development Institute Patentee after: Long Qizhi Address before: 542800, Baisha Town, Fuchuan County, Hezhou, the Guangxi Zhuang Autonomous Region Patentee before: Long Qizhi |
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Effective date of registration: 20191022 Address after: 314502 202a, building B, 369 GONGMAO Avenue, Puyuan Town, Tongxiang City, Jiaxing City, Zhejiang Province Patentee after: Tongxiang Hongchen Industrial Design Co., Ltd Address before: 542800 the Guangxi Zhuang Autonomous Region Hezhou City eight step Xiyuan No. 40 Lane eight new materials research and Development Institute Patentee before: Long Qi Zhi |