CN105440807A - Dust-free chalk for magnetic blackboard - Google Patents
Dust-free chalk for magnetic blackboard Download PDFInfo
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- CN105440807A CN105440807A CN201511011764.1A CN201511011764A CN105440807A CN 105440807 A CN105440807 A CN 105440807A CN 201511011764 A CN201511011764 A CN 201511011764A CN 105440807 A CN105440807 A CN 105440807A
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- talc powder
- modified talc
- chalk
- prefabricated material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention discloses dust-free chalk for a magnetic blackboard. The dust-free chalk comprises raw materials as follows: gypsum, modified talc powder, cotton linter, natural beeswax, glycerol, epoxidized acetyl methyl linoleate, gelatin, sodium polyacrylate and pigments, wherein the modified talc powder is prepared with the process as follows: talc powder, diatomite, ferric trichloride and ferrous sulfate are put into water and stirred uniformly, a sodium bicarbonate solution is added dropwise, the mixture is stirred, filtered and dried, and a first prepared material is obtained; cyclodextrin and isobutyltriethoxysilane are stirred uniformly, an ethanol solution is added and mixed uniformly, the pH (potential of hydrogen) value of the system is adjusted by adding boric acid, and a second prepared material is obtained; the second prepared material is sprayed to the first prepared material, and the modified talc powder is obtained after stirring and drying. The chalk can be moved on dry and wet blackboards smoothly and does not slip, characters are clear, dust falling in the writing process can be adsorbed to the surface of the magnetic blackboard, rising dust cannot be produced, no marks are left on the blackboard after the characters are erased, and the chalk is low in cost and durable.
Description
Technical field
The present invention relates to chalk technical field, particularly relate to a kind of without airborne dust magnet board chalk.
Background technology
Chalk is the instrument widely used in daily life, is generally used for book and writes on the blackboard.A kind of white depositions of the composition of common chalk mainly calcium sulfate, its dust is sucked by academics and students, will directly cause respiratory tract, pulmonary infection, cause the generation of the diseases such as trachitis, asthma, pneumonia, and objectionable impurities flows into blood vessel, the heart, lung failure can be caused again, cause various diseases, thus the physical and mental health of grievous injury Faculty and Students.
Summary of the invention
The present invention proposes a kind of without airborne dust magnet board chalk, not only fluent writing, non-slip on dry, the blackboard that wets, and writing is clear, the dust dropped in writing process can be adsorbed on magnet board surface, can not produce airborne dust, erasing leaves no trace, simultaneously with low cost, durable.
The one that the present invention proposes is without airborne dust magnet board chalk, its raw material comprises by weight: 30 ~ 60 parts, gypsum, modified talc powder 20 ~ 40 parts, linters 1 ~ 5 part, natural beeswax 0.5 ~ 2.5 part, glycerine 2 ~ 6 parts, epoxy acetyl linolenic acid methyl esters 6 ~ 10 parts, 2 ~ 10 parts, gelatin, sodium polyacrylate 1 ~ 1.8 part, pigment 0.1 ~ 0.8 part;
Wherein modified talc powder adopts following technique to prepare: talcum powder, diatomite, iron trichloride, ferrous sulfate are put into water and stirred, and dripping sodium hydrogen carbonate solution to system pH is 8.5 ~ 10.5, stirs, and filters, dry, obtains the first prefabricated material; Cyclodextrin, isobutyl triethoxy silane are stirred, add ethanolic soln and mix, adding boric acid regulation system pH value is 5.5 ~ 6.5, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 2500 ~ 3500r/min, whipping temp is 110 ~ 120 DEG C, dries, obtains modified talc powder.
Preferably, in the preparation technology of modified talc powder, the weight ratio of talcum powder, diatomite, iron trichloride, ferrous sulfate is 35 ~ 45:5 ~ 15:0.5 ~ 2.5:1 ~ 1.8.
Preferably, in the preparation technology of modified talc powder, the weight ratio of cyclodextrin, isobutyl triethoxy silane is 4 ~ 10:0.5 ~ 1.5.
Preferably, modified talc powder adopts following technique to prepare: by weight 35 ~ 45 parts of talcum powder, 5 ~ 15 parts of diatomite, 0.5 ~ 2.5 part of iron trichloride, 1 ~ 1.8 part of ferrous sulfate are put into 80 ~ 120 parts of water and stirred, dropping concentration is sodium hydrogen carbonate solution to the system pH of 1.5 ~ 2.5mol/L is 8.5 ~ 10.5, continue stirring 5 ~ 10h, filter, drying, obtains the first prefabricated material; 4 ~ 10 parts of cyclodextrin, 0.5 ~ 1.5 part of isobutyl triethoxy silane are stirred, whipping temp is 55 ~ 65 DEG C, adding 20 ~ 40 parts of massfractions is that 40 ~ 60wt% ethanolic soln mixes, and adding boric acid regulation system pH value is 5.5 ~ 6.5, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 2500 ~ 3500r/min, whipping temp is 110 ~ 120 DEG C, dries, obtains modified talc powder.
Preferably, the weight ratio of gypsum, talcum powder, linters is 35 ~ 55:30 ~ 36:2 ~ 4.
Preferably, the weight ratio of natural beeswax, glycerine, epoxy acetyl linolenic acid methyl esters, gelatin, sodium polyacrylate is 1 ~ 1.8:4 ~ 5:7 ~ 8:4 ~ 6:1.2 ~ 1.5.
Preferably, described without airborne dust magnet board chalk, its raw material comprises by weight: 35 ~ 55 parts, gypsum, modified talc powder 30 ~ 36 parts, linters 2 ~ 4 parts, natural beeswax 1 ~ 1.8 part, glycerine 4 ~ 5 parts, epoxy acetyl linolenic acid methyl esters 7 ~ 8 parts, 4 ~ 6 parts, gelatin, sodium polyacrylate 1.2 ~ 1.5 parts, pigment 0.2 ~ 0.5 part.
The present invention is in the preparation technology of modified talc powder, talcum powder and diatomite surface deposition, absorption ferrous ion and ferric ion, and cyclodextrin, isobutyl triethoxy silane is under sour environment, the alcoholic extract hydroxyl group of the molecule pore space structure outside surface of cyclodextrin can organically combine with isobutyl triethoxy silane, the product formed is combined with the first prefabricated material in alkalescence, under violent stirring effect, in diatomite, oxo bridge is interrupted, formation can act on group, its microvoid structure not only forms absorption to neighbouring material, and group can be acted on and isobutyl triethoxy silane organically combines, bonding force is stronger, gained modified talc powder not only has certain surfaceness and hardness, and and gypsum, linters coordinates, significantly improve absorption property of the present invention, make the present invention not only dry, fluent writing on wet blackboard, non-slip, and writing is clear, the dust dropped in writing process can be adsorbed on magnet board surface, airborne dust can not be produced, modified talc powder coordinates with glycerine, epoxy acetyl linolenic acid methyl esters, gelatin, sodium polyacrylate simultaneously, and not only loading level is large, and cohesive force is good, and erasing leaves no trace, simultaneously with low cost, durable.
Embodiment
Embodiment 1
A kind of without airborne dust magnet board chalk, its raw material comprises by weight: 30 parts, gypsum, modified talc powder 40 parts, linters 1 part, natural beeswax 2.5 parts, glycerine 2 parts, epoxy acetyl linolenic acid methyl esters 10 parts, 2 parts, gelatin, sodium polyacrylate 1.8 parts, pigment 0.1 part;
Wherein modified talc powder adopts following technique to prepare: talcum powder, diatomite, iron trichloride, ferrous sulfate are put into water and stirred, and dripping sodium hydrogen carbonate solution to system pH is 10.5, stirs, and filters, dry, obtains the first prefabricated material; Cyclodextrin, isobutyl triethoxy silane are stirred, add ethanolic soln and mix, adding boric acid regulation system pH value is 5.5, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 3500r/min, whipping temp is 110 DEG C, dries, obtains modified talc powder.
Embodiment 2
A kind of without airborne dust magnet board chalk, its raw material comprises by weight: 60 parts, gypsum, modified talc powder 20 parts, linters 5 parts, natural beeswax 0.5 part, glycerine 6 parts, epoxy acetyl linolenic acid methyl esters 6 parts, 10 parts, gelatin, sodium polyacrylate 1 part, pigment 0.8 part;
Wherein modified talc powder adopts following technique to prepare: talcum powder, diatomite, iron trichloride, ferrous sulfate are put into water and stirred, and dripping sodium hydrogen carbonate solution to system pH is 8.5, stirs, and filters, dry, obtains the first prefabricated material; Cyclodextrin, isobutyl triethoxy silane are stirred, add ethanolic soln and mix, adding boric acid regulation system pH value is 6.5, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 2500r/min, whipping temp is 120 DEG C, dries, obtains modified talc powder.
Embodiment 3
A kind of without airborne dust magnet board chalk, its raw material comprises by weight: 35 parts, gypsum, modified talc powder 36 parts, linters 2 parts, natural beeswax 1.8 parts, glycerine 4 parts, epoxy acetyl linolenic acid methyl esters 8 parts, 4 parts, gelatin, sodium polyacrylate 1.5 parts, pigment 0.2 part.
Wherein modified talc powder adopts following technique to prepare: by weight 45 parts of talcum powder, 5 parts of diatomite, 2.5 parts of iron trichlorides, 1 part of ferrous sulfate are put into 120 parts of water and stirred, dropping concentration is sodium hydrogen carbonate solution to the system pH of 1.5mol/L is 10.2, continue to stir 5h, filter, drying, obtains the first prefabricated material; 10 parts of cyclodextrin, 0.5 part of isobutyl triethoxy silane are stirred, whipping temp is 65 DEG C, and adding 20 parts of massfractions is that 60wt% ethanolic soln mixes, and adding boric acid regulation system pH value is 5.7, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 3200r/min, whipping temp is 113 DEG C, dries, obtains modified talc powder.
Embodiment 4
A kind of without airborne dust magnet board chalk, its raw material comprises by weight: 55 parts, gypsum, modified talc powder 30 parts, linters 4 parts, natural beeswax 1 part, glycerine 5 parts, epoxy acetyl linolenic acid methyl esters 7 parts, 6 parts, gelatin, sodium polyacrylate 1.2 parts, pigment 0.5 part.
Wherein modified talc powder adopts following technique to prepare: by weight 35 parts of talcum powder, 15 parts of diatomite, 0.5 part of iron trichloride, 1.8 parts of ferrous sulfate are put into 80 parts of water and stirred, dropping concentration is sodium hydrogen carbonate solution to the system pH of 2.5mol/L is 8.8, continue to stir 10h, filter, drying, obtains the first prefabricated material; 4 parts of cyclodextrin, 1.5 parts of isobutyl triethoxy silanes are stirred, whipping temp is 55 DEG C, and adding 40 parts of massfractions is that 40wt% ethanolic soln mixes, and adding boric acid regulation system pH value is 6.3, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 2800r/min, whipping temp is 117 DEG C, dries, obtains modified talc powder.
Embodiment 5
A kind of without airborne dust magnet board chalk, its raw material comprises by weight: 45 parts, gypsum, modified talc powder 33 parts, linters 3 parts, natural beeswax 1.4 parts, glycerine 4.5 parts, epoxy acetyl linolenic acid methyl esters 7.5 parts, 5 parts, gelatin, sodium polyacrylate 1.4 parts, pigment 0.4 part.
Wherein modified talc powder adopts following technique to prepare: by weight 40 parts of talcum powder, 10 parts of diatomite, 1.5 parts of iron trichlorides, 1.4 parts of ferrous sulfate are put into 100 parts of water and stirred, dropping concentration is sodium hydrogen carbonate solution to the system pH of 2mol/L is 9.5, continue to stir 8h, filter, drying, obtains the first prefabricated material; 7 parts of cyclodextrin, 1 part of isobutyl triethoxy silane are stirred, whipping temp is 60 DEG C, and adding 30 parts of massfractions is that 50wt% ethanolic soln mixes, and adding boric acid regulation system pH value is 6, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 3000r/min, whipping temp is 115 DEG C, dries, obtains modified talc powder.
The preparation technology of general chalk is adopted to be prepared without airborne dust magnet board chalk described in above-described embodiment 1 ~ 5.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (7)
1. one kind without airborne dust magnet board chalk, it is characterized in that, its raw material comprises by weight: 30 ~ 60 parts, gypsum, modified talc powder 20 ~ 40 parts, linters 1 ~ 5 part, natural beeswax 0.5 ~ 2.5 part, glycerine 2 ~ 6 parts, epoxy acetyl linolenic acid methyl esters 6 ~ 10 parts, 2 ~ 10 parts, gelatin, sodium polyacrylate 1 ~ 1.8 part, pigment 0.1 ~ 0.8 part;
Wherein modified talc powder adopts following technique to prepare: talcum powder, diatomite, iron trichloride, ferrous sulfate are put into water and stirred, and dripping sodium hydrogen carbonate solution to system pH is 8.5 ~ 10.5, stirs, and filters, dry, obtains the first prefabricated material; Cyclodextrin, isobutyl triethoxy silane are stirred, add ethanolic soln and mix, adding boric acid regulation system pH value is 5.5 ~ 6.5, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 2500 ~ 3500r/min, whipping temp is 110 ~ 120 DEG C, dries, obtains modified talc powder.
2. according to claim 1ly it is characterized in that without airborne dust magnet board chalk, in the preparation technology of modified talc powder, the weight ratio of talcum powder, diatomite, iron trichloride, ferrous sulfate is 35 ~ 45:5 ~ 15:0.5 ~ 2.5:1 ~ 1.8.
3. according to claim 1 and 2ly it is characterized in that without airborne dust magnet board chalk, in the preparation technology of modified talc powder, the weight ratio of cyclodextrin, isobutyl triethoxy silane is 4 ~ 10:0.5 ~ 1.5.
4. according to any one of claim 1-3 without airborne dust magnet board chalk, it is characterized in that, modified talc powder adopts following technique to prepare: by weight 35 ~ 45 parts of talcum powder, 5 ~ 15 parts of diatomite, 0.5 ~ 2.5 part of iron trichloride, 1 ~ 1.8 part of ferrous sulfate are put into 80 ~ 120 parts of water and stirred, dropping concentration is sodium hydrogen carbonate solution to the system pH of 1.5 ~ 2.5mol/L is 8.5 ~ 10.5, continue stirring 5 ~ 10h, filter, dry, obtain the first prefabricated material; 4 ~ 10 parts of cyclodextrin, 0.5 ~ 1.5 part of isobutyl triethoxy silane are stirred, whipping temp is 55 ~ 65 DEG C, adding 20 ~ 40 parts of massfractions is that 40 ~ 60wt% ethanolic soln mixes, and adding boric acid regulation system pH value is 5.5 ~ 6.5, obtains the second prefabricated material; By the second prefabricated material spray on the first prefabricated material, then stir with the stirring velocity of 2500 ~ 3500r/min, whipping temp is 110 ~ 120 DEG C, dries, obtains modified talc powder.
5. according to any one of claim 1-4 without airborne dust magnet board chalk, it is characterized in that, the weight ratio of gypsum, talcum powder, linters is 35 ~ 55:30 ~ 36:2 ~ 4.
6. according to any one of claim 1-5 without airborne dust magnet board chalk, it is characterized in that, the weight ratio of natural beeswax, glycerine, epoxy acetyl linolenic acid methyl esters, gelatin, sodium polyacrylate is 1 ~ 1.8:4 ~ 5:7 ~ 8:4 ~ 6:1.2 ~ 1.5.
7. according to any one of claim 1-6 without airborne dust magnet board chalk, it is characterized in that, its raw material comprises by weight: 35 ~ 55 parts, gypsum, modified talc powder 30 ~ 36 parts, linters 2 ~ 4 parts, natural beeswax 1 ~ 1.8 part, glycerine 4 ~ 5 parts, epoxy acetyl linolenic acid methyl esters 7 ~ 8 parts, 4 ~ 6 parts, gelatin, sodium polyacrylate 1.2 ~ 1.5 parts, pigment 0.2 ~ 0.5 part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511011764.1A CN105440807A (en) | 2015-12-30 | 2015-12-30 | Dust-free chalk for magnetic blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511011764.1A CN105440807A (en) | 2015-12-30 | 2015-12-30 | Dust-free chalk for magnetic blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105440807A true CN105440807A (en) | 2016-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511011764.1A Pending CN105440807A (en) | 2015-12-30 | 2015-12-30 | Dust-free chalk for magnetic blackboard |
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| CN (1) | CN105440807A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985003082A1 (en) * | 1984-01-12 | 1985-07-18 | Seung Jeh Lee | Process for producing blackboard crayon |
| CN1931933A (en) * | 2005-09-16 | 2007-03-21 | 吴文龙 | Chalk made of starch |
| KR20090026425A (en) * | 2007-09-10 | 2009-03-13 | 김민자 | Manufacture method for water color pastel and chalk and thereof product |
| CN103073958A (en) * | 2013-01-12 | 2013-05-01 | 何燕 | dust-free chalk and manufacturing method thereof |
-
2015
- 2015-12-30 CN CN201511011764.1A patent/CN105440807A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985003082A1 (en) * | 1984-01-12 | 1985-07-18 | Seung Jeh Lee | Process for producing blackboard crayon |
| CN1931933A (en) * | 2005-09-16 | 2007-03-21 | 吴文龙 | Chalk made of starch |
| KR20090026425A (en) * | 2007-09-10 | 2009-03-13 | 김민자 | Manufacture method for water color pastel and chalk and thereof product |
| CN103073958A (en) * | 2013-01-12 | 2013-05-01 | 何燕 | dust-free chalk and manufacturing method thereof |
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Application publication date: 20160330 |