CN102952433B - Water-soluble chalk - Google Patents
Water-soluble chalk Download PDFInfo
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- CN102952433B CN102952433B CN201110251663.7A CN201110251663A CN102952433B CN 102952433 B CN102952433 B CN 102952433B CN 201110251663 A CN201110251663 A CN 201110251663A CN 102952433 B CN102952433 B CN 102952433B
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- water
- chalk
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- soluble chalk
- pigment
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Abstract
The invention relates to a water-soluble chalk for teaching greenboard writing, particularly a water-soluble chalk suitable for writing on a smooth-surface non-adsorptive greenboard. The water-soluble chalk is composed of the following components in percentage by weight: 5-10% of film former, 8-20% of lubricant, 10-20% of erasable agent, 25-40% of dispersant, 0.5-2% of defoaming agent and 25-40% of pigment. The film former is 58# or 56# fully-refined or semi-refined paraffin wax, 52# chemical wax, soap wax or 46# low-melting-point paraffin wax; the lubricant is polyethyleneglycol; the erasable agent is Span-80; the dispersant is palmitinic acid; the defoaming agent is organosilicon; and the pigment is titanium white, or a mixture of lithopone and chromatic pigment. The invention has the advantages of low hardness, high wet-writing clarity, favorable erasability and no environmental pollution.
Description
Invention field
The present invention relates to a kind of water-soluble teaching board chalk, particularly a kind of watery chalk can write on ganoid non-adsorbent imparts knowledge to students green plate.
Background technology
For a long time, our teaching appliance continues to use blackboard and gypsum chalk mode, chalk because it is cheap, easy to use, there is stronger practicality and become the most frequently used educational aid of school; But the individual workshop that domestic common chalk mostly is " three nothings " produces, they dose the objectionable impurities such as lime powder, dry powder that is cheap, that damage user's health in a large number in raw materials for production in order to maximize profit, and containing assorted too much dysgraphia, blackboard is with plate face is dirty long afterwards, ash white smear, literary sketch sharpness declines, and affects vision; Particularly produce the dust that can not be absorbed by the body in a large number when writing and wipe, severe contamination teaching environment, affects the healthy of Faculty and Students, particularly works the mischief to the respiratory system of people.
The micronic dust occurred in recent years and dust-free chalk are produced by dosing 107 glue substantially, although this kind of chalk seldom has dust from flying when writing, but when wiping because adhesive action disappears, can produce equally and fly upward dust in a large number. and 107 glue are formed by PVA, hydrochloric acid, formaldehyde and caustic soda condensation, so all containing a certain amount of free formaldehyde in 107 glue; Some producer is in order to improve the whiteness of chalk in addition, and dose fluorescent whitening agent VBL aborning, VBL belongs to p-diaminodiphenyl structure, it should be noted that: free formaldehyde and p-diaminodiphenyl belong to carcinogenic substance together, if these dust containing free formaldehyde, p-diaminodiphenyl are by Faculty and Students' suction body, its potential harm will be very serious.
The place that children learn every day, the maximum place stayed every day is exactly classroom, and the dust pollution of classroom chalk is quite serious.Therefore, improve teaching environment, promote teachers and students' health and be very important.Solving the approach of dust has a lot, and some producers release dust-sucking eraser device, and its principle is suction cleaner principle, wipes the writing on the blackboard word on green plate with it, but dust suppressionly not falling of producing in writing process, and power consumption is comparatively greatly costly; Some producers release draw back plate, and two boards is imparted knowledge to students, and use alternately, this approach solves efficiency of teaching during class-teaching of teacher, and upper class hour need not wipe green plate, waits lower class hour to be wiped by student, does not still solve the problem of chalk dust; Some schools promote E-learning, and with interactive electric whiteboard teaching, but the current size of this plate is less, cost is high, and traditional writing on the blackboard is irreplaceable in middle and primary schools, and this kind of board of education does not replace the green plate of teaching, is not suitable for the whole nation and promotes on a large scale.
Water-soluble chalk solves the minimum and effective scheme of classroom dust pollution, becomes dry and wipe as wet rubbing, can Wet-dry, and wet green plate also can be write, the whiteness of font, blackboard eraser cloth is common towel, economical rationality.Water-soluble non-dust chalk in the past, as the patent No.: the water-soluble non-dust chalk of 91106154.1 and 91104099.4 inventions, because board of education is at that time obscure glass, cement making sheet or wooden blackboard, plate does not mate with pen, and above-mentioned two kinds of chalk hardness are large, it wets and writes in vain, causes application effect bad.
Summary of the invention
For solving the problem, the present invention discloses a kind of soft, wet writes that high, the easy wiping of sharpness is good, environmentally safe, is specially adapted to ganoid non-adsorbent and imparts knowledge to students the Water-soluble chalk that green plate is write.
Technical scheme of the present invention is as follows:
A kind of Water-soluble chalk, consists of the following composition by weight percentage:
Said membrane-forming agent is 58
#, 56
#full refining or SEMI-REFINED PARAFFIN WAX, 52
#chemical industry wax, soap wax, 46
#one in low melt point paraffin.
Said lubricant is polyoxyethylene glycol.
Said erasable agent is Arlacel-80.
Said dispersion agent is palmitinic acid.
Said defoamer is organosilicon.
Said pigment is titanium dioxide, or the mixture of zinc sulfide white and coloured pigment.
Beneficial effect of the present invention is: with low melt point paraffin, the hardness of Water-soluble chalk is reduced, and can increase its wet sharpness write, meet teaching request.Dispersion agent palmitinic acid in Water-soluble chalk component can reduce melting point of paraffin wax further, and makes the emulsification of paraffin, dispersed better, does not have the precipitation of paraffin when making chalk.Erasable agent Arlacel-80 in Water-soluble chalk component can make the wetting ability of Water-soluble chalk strengthen, easy wiping, and it is tack-free to hold Water-soluble chalk surface.Selected by Water-soluble chalk of the present invention, all substances are all to human non-toxic, can natural degradation, environmentally safe.
Embodiment:
Be specific embodiments of the invention below.These embodiments are only not used in for illustration of the present invention and limit the scope of the invention, below the test method of unreceipted actual conditions in routine embodiment, and conveniently condition is carried out usually.
This Water-soluble chalk consists of the following composition by weight percentage:
The first step: the preparation of Water-soluble chalk masterbatch:
35kg 46 is added in electroceramics reactor
#paraffin, 75kg polyoxyethylene glycol, 75kg Arlacel-80,150kg palmitinic acid, start stirring, heater switch, temperature controls at 90 DEG C, and time 2 h makes Water-soluble chalk masterbatch.
Second step: the preparation of Water-soluble chalk:
1, white Water-soluble chalk: take 160kg (325 order) titanium dioxide, 5kg organosilicon adds in the Water-soluble chalk masterbatch that the first step makes, temperature controls at 50 DEG C, and 200 revs/min are stirred 0.5 hour, titanium dioxide complete wetting is disperseed; Be injected in the mould of Chalk machine by the paste slurry after stirring, after cooling, the demoulding forms.
2, yellow Water-soluble chalk: take 140kg (325 order) zinc sulfide white, 20kg organic yellow pigment, 5kg organosilicon add in the Water-soluble chalk masterbatch that the first step makes, temperature controls at 50 DEG C, 200 revs/min are stirred 0.5 hour, powder complete wetting are disperseed; Be injected in the mould of Chalk machine by the paste slurry after stirring, after cooling, the demoulding forms.
3, red Water-soluble chalk: take 145kg (325 order) zinc sulfide white, 15kg permanent bordeaux pigment, 5kg organosilicon add in the Water-soluble chalk masterbatch that the first step makes, temperature controls at 50 DEG C, 200 revs/min are stirred 0.5 hour, powder complete wetting are disperseed; Be injected in the mould of Chalk machine by the paste slurry after stirring, after cooling, the demoulding forms.
4, green Water-soluble chalk: take 135kg (325 order) zinc sulfide white, the dark green pigment of 25kg phthalein, 5kg organosilicon add in the Water-soluble chalk masterbatch that the first step makes, temperature controls at 50 DEG C, 200 revs/min are stirred 0.5 hour, powder complete wetting are disperseed; Be injected in the mould of Chalk machine by the paste slurry after stirring, after cooling, the demoulding forms.
Claims (5)
1. a Water-soluble chalk, is characterized in that consisting of the following composition (by weight percentage):
Said membrane-forming agent is 46
#low melt point paraffin;
Said erasable agent is Arlacel-80;
Said dispersion agent is palmitinic acid.
2. Water-soluble chalk according to claim 1, is characterized in that said lubricant is polyoxyethylene glycol.
3. Water-soluble chalk according to claim 1, is characterized in that said defoamer is organosilicon.
4. Water-soluble chalk according to claim 1, is characterized in that said pigment is titanium dioxide.
5. Water-soluble chalk according to claim 1, is characterized in that said pigment is the mixture of zinc sulfide white and coloured pigment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110251663.7A CN102952433B (en) | 2011-08-26 | 2011-08-26 | Water-soluble chalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110251663.7A CN102952433B (en) | 2011-08-26 | 2011-08-26 | Water-soluble chalk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102952433A CN102952433A (en) | 2013-03-06 |
| CN102952433B true CN102952433B (en) | 2015-05-13 |
Family
ID=47761843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110251663.7A Expired - Fee Related CN102952433B (en) | 2011-08-26 | 2011-08-26 | Water-soluble chalk |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102952433B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103254692A (en) * | 2013-05-21 | 2013-08-21 | 湖南省状元坊教育科技发展有限公司 | Water-soluble environment-friendly chalk and preparation method thereof |
| CN104109422B (en) * | 2014-07-10 | 2016-04-06 | 石家庄科达文教用品有限公司 | A kind of multimedia teaching water-soluble chalk and preparation method thereof |
| CN108659626A (en) * | 2018-07-11 | 2018-10-16 | 欧光君 | A kind of water-soluble chalk and its manufacturing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62288673A (en) * | 1986-06-09 | 1987-12-15 | Nippon Rikagaku Kogyo Kk | Chalk composition and production thereof |
| JPH02166176A (en) * | 1988-12-19 | 1990-06-26 | Tombow Pencil Co Ltd | Chalk for stone |
| CN1632007A (en) * | 2004-11-09 | 2005-06-29 | 王力 | Self-discoloration chalk |
| CN101550301A (en) * | 2009-05-23 | 2009-10-07 | 曾爱军 | Biochemical chalk and preparation method thereof |
| CN101885930A (en) * | 2010-05-06 | 2010-11-17 | 成都松齐明科技有限公司 | Multifunctional water-soluble chalk and manufacture method thereof |
-
2011
- 2011-08-26 CN CN201110251663.7A patent/CN102952433B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62288673A (en) * | 1986-06-09 | 1987-12-15 | Nippon Rikagaku Kogyo Kk | Chalk composition and production thereof |
| JPH02166176A (en) * | 1988-12-19 | 1990-06-26 | Tombow Pencil Co Ltd | Chalk for stone |
| CN1632007A (en) * | 2004-11-09 | 2005-06-29 | 王力 | Self-discoloration chalk |
| CN101550301A (en) * | 2009-05-23 | 2009-10-07 | 曾爱军 | Biochemical chalk and preparation method thereof |
| CN101885930A (en) * | 2010-05-06 | 2010-11-17 | 成都松齐明科技有限公司 | Multifunctional water-soluble chalk and manufacture method thereof |
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| Publication number | Publication date |
|---|---|
| CN102952433A (en) | 2013-03-06 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150513 Termination date: 20150826 |
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| EXPY | Termination of patent right or utility model |