CN103468061A - Green, environment-friendly and dust-free chalk - Google Patents
Green, environment-friendly and dust-free chalk Download PDFInfo
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- CN103468061A CN103468061A CN201310386442XA CN201310386442A CN103468061A CN 103468061 A CN103468061 A CN 103468061A CN 201310386442X A CN201310386442X A CN 201310386442XA CN 201310386442 A CN201310386442 A CN 201310386442A CN 103468061 A CN103468061 A CN 103468061A
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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
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 be by
calcium sulfatehydrate (being commonly called as plaster stone) make.Also can add various
pigmentmake 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): 2CaSO4H2O+3H2O=2CaSO42H2O that the 2CaSO42H2O=2CaSO4H2O+3H2O plaster of Paris adds the reaction that water becomes plaster stone
the teacheroften need on blackboard, write, draw and explained.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.Use chalk-writing
writing on the blackboard, be 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 to body (as
silicon-dioxide, asbestos),
alveolarand accumulate morely in 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's workhygiene department, in occupation
pneumoconiosisrelevant regulations in, 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 environmental protection dust-free chalk is proposed.
Environmental protection dust-free chalk of the present invention is characterized in that: by weight, material formula is: 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.
Environmental protection dust-free chalk preparation method of the present invention 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 both environmental protection dust-free chalk of the present invention.
Environmental protection dust-free chalk of the present invention, have write smoothly, writing is clear, hardness is moderate, dust such as is difficult for flying upward less at the characteristics.
The present invention compared with prior art its beneficial effect is: have write smoothly, writing is clear, hardness is moderate, dust such as is difficult for flying upward less at the characteristics.
Concrete embodiment:
Below in conjunction with embodiment, the invention will be further described, but embodiments of the present invention are not limited to this.
Environmental protection dust-free chalk of the present invention, raw materials usedly buy acquisition.
Embodiment 1
Environmental protection dust-free chalk of the present invention is characterized in that: by weight, material formula is: 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
Environmental protection dust-free chalk preparation method of the present invention 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 both environmental protection dust-free chalk of the present invention.
Environmental protection dust-free chalk of the present invention, have write smoothly, writing is clear, hardness is moderate, dust such as is difficult for flying upward less at the characteristics.
Claims (2)
1. an environmental protection dust-free chalk, it is characterized in that: by weight, material formula is: 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. an environmental protection dust-free chalk preparation method, is characterized in that: by weight, by gesso 15-20 part, after the mixing of chalk powder 15-20 part, add water 15-20 part and stir; Add mill base 3-5 part, after stirring, extrusion molding, drying both environmental protection dust-free chalk of the present invention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310386442.XA CN103468061B (en) | 2013-08-30 | 2013-08-30 | Environmental protection dust-free chalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310386442.XA CN103468061B (en) | 2013-08-30 | 2013-08-30 | Environmental protection dust-free chalk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103468061A true CN103468061A (en) | 2013-12-25 |
| CN103468061B CN103468061B (en) | 2015-09-30 |
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ID=49793113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310386442.XA Active CN103468061B (en) | 2013-08-30 | 2013-08-30 | Environmental protection dust-free chalk |
Country Status (1)
| Country | Link |
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| CN (1) | CN103468061B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826025A (en) * | 2020-08-17 | 2020-10-27 | 淮阴工学院 | Regenerated chalk manufactured based on industrial waste alkaline residues |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046746A (en) * | 1989-04-29 | 1990-11-07 | 刘凤义 | Film enveloped chalk is made liquid |
| CN1796470A (en) * | 2004-12-29 | 2006-07-05 | 薛玮翔 | Fragrant coloured chalk without dust |
-
2013
- 2013-08-30 CN CN201310386442.XA patent/CN103468061B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046746A (en) * | 1989-04-29 | 1990-11-07 | 刘凤义 | Film enveloped chalk is made liquid |
| CN1796470A (en) * | 2004-12-29 | 2006-07-05 | 薛玮翔 | Fragrant coloured chalk without dust |
Non-Patent Citations (2)
| Title |
|---|
| 周学之: "《中国刑事科学技术大全理化物证检验学》", 30 June 2003, article "粉笔、铅笔、蜡笔的检验", pages: 386-387 * |
| 李东光: "《1000种小化工产品配方与制作（1-200）》", 31 January 2012, article "粉笔" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826025A (en) * | 2020-08-17 | 2020-10-27 | 淮阴工学院 | Regenerated chalk manufactured based on industrial waste alkaline residues |
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| Publication number | Publication date |
|---|---|
| CN103468061B (en) | 2015-09-30 |
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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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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
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 |