CN103819965A - Environment-friendly board writing liquid and preparation method thereof - Google Patents
Environment-friendly board writing liquid and preparation method thereof Download PDFInfo
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- CN103819965A CN103819965A CN201410065937.7A CN201410065937A CN103819965A CN 103819965 A CN103819965 A CN 103819965A CN 201410065937 A CN201410065937 A CN 201410065937A CN 103819965 A CN103819965 A CN 103819965A
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- writing liquid
- pigment
- blackboard writing
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- 239000007788 liquid Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000049 pigment Substances 0.000 claims abstract description 36
- 238000000227 grinding Methods 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 239000000976 ink Substances 0.000 claims description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 30
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 26
- -1 polyoxyethylene Polymers 0.000 claims description 17
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 16
- 229920002521 macromolecule Polymers 0.000 claims description 15
- 229920000178 Acrylic resin Polymers 0.000 claims description 14
- 239000004925 Acrylic resin Substances 0.000 claims description 14
- 239000006185 dispersion Substances 0.000 claims description 13
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 10
- 229920002472 Starch Polymers 0.000 claims description 9
- 235000019698 starch Nutrition 0.000 claims description 9
- 239000008107 starch Substances 0.000 claims description 9
- 239000000080 wetting agent Substances 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000003020 moisturizing effect Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000003860 storage Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZEMPKEQAKRGZGQ-AAKVHIHISA-N 2,3-bis[[(z)-12-hydroxyoctadec-9-enoyl]oxy]propyl (z)-12-hydroxyoctadec-9-enoate Chemical compound CCCCCCC(O)C\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CC(O)CCCCCC)COC(=O)CCCCCCC\C=C/CC(O)CCCCCC ZEMPKEQAKRGZGQ-AAKVHIHISA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical group CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000004500 asepsis Methods 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001055 blue pigment Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 125000000468 ketone group Chemical group 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
- 210000000216 zygoma Anatomy 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention relates to an environment-friendly board writing liquid and a preparation method thereof, and belongs to the technical field of chemical product preparation. The environment-friendly board writing liquid particularly comprises the components in parts by weight: 4.0-8.0 parts of a pigment, 4.0-10.0 parts of a film-forming agent, 3.0-8.0 parts of a dispersing agent, 6.0-12.0 parts of a moisturizing agent, and 83.0-62.0 parts of a solvent. The preparation method comprises the preparation steps: firstly adding the solvent into a pre-dispersing pot, successively adding the dispersing agent, the film-forming agent and the moisturizing agent according to the formula ratio with stirring until being completely dissolved evenly, finally adding the pigment, after fully stirring and mixing, carrying out micro grinding for 2-8 hours to make the pigment particle diameter reach a specific size, then stopping grinding, and discharging. The ink prepared by the method has the advantages of bright-colored color, low viscosity, uniform ink discharging, fluent writing, stable quality, energy saving, environmental protection, easy use, simple process, and low cost, does not paste boards, and is easy to wipe.
Description
Technical field
The present invention relates to a kind of environment-friendly blackboard writing liquid and preparation method thereof, more specifically say that one do not stick with paste plate, easily wiping, writing liquid of good stability and preparation method thereof, belongs to Chemicals preparing technical field.
Background technology
For a long time, chalk ash pollution is larger, numerous users endure dust injury to the fullest extent, in order to change this phenomenon, writing on blackboard ink is the new door product that ink industry is developed in recent years, there is the characteristics such as dustless, easy wiping, supporting with Special writing pen, easy to carry, erasing out handwriting within a certain period of time, continue to write and depending on reading and do not affect, there is the writing function of traditional ink, easy-to-write and erasable, no dust pollution, be widely used in the occasion such as office and academic exchange, meeting, become gradually a new focus of chemical research.
Take a broad view of the research and development course of writing on blackboard ink, since last century 50, the sixties, passed through so far following developmental stage: (1) can not step section, early stage white board marker is write and is write rear extremely difficult wiping; Its primary solvent is ketone that toxicity is larger, ester, benzene class and composition thereof; (2) the erasable stage, becoming slightly erasable, but smell stimulates very much through development, and not moisturizing, and its primary solvent is acetate esters and alcohols and its derivative; (3) stage easy to use, erasability has greatly improvement, and it is gentle that smell shows slightly, and has certain performance of keeping humidity, and stays and still have erasability after the plate certain period, and its primary solvent is aliphatic alcohols and its derivative that toxicity is lower.
The writing on blackboard special-purpose ink of marketing is to be mainly made up of oily solution and staining agent in the market, and this ink also has difficult wiping, easily scumming, and inequality out of ink, writes shortcoming not smooth, poisonous, not environmental protection.From the angle of Sustainable development, along with the progress in epoch, the breakthrough of science and technology, people will propose the requirement of higher more rationality to utensil used in everyday.The research and development track of writing on blackboard ink will inevitably stride into the new stage: the environmental protection hommization stage, and water-soluble, and do not harm environment and the mankind.
In order to overcome this shortcoming, free ink pen environmental protection ink is come out one after another, and be scattered in ink system and make it painted equably, but common writing on blackboard ink pigment particles is large with pigment particles, dispersion effect is poor, can not reach desirable writing effect, if its particle is diminished, along with diminishing of size of particles, specific surface area will increase greatly, Van der Waals force between particle will become greatly, very easily produce cohesion between the particle of emblem, thereby cause producing layering, precipitation iso-metamorphism phenomenon in storage process.General Technology and equipment are difficult to make pigment particles in ink system to keep good dispersion stabilization.
In production process, elongated along with the increase of grinding rate and time, it is large that the viscosity of ink system will become, so keeping low viscosity and being controlled at is the another important technology difficult point of writing on blackboard ink more among a small circle., producing the environment-friendly water-based board pen ink of desirable high-quality, is the important technology problem that is worth research.
Chinese patent document CN102786843A discloses a kind of white board marker environment-friendly writing ink, is made up environment-protecting asepsis of vegetable pigment, emulsifying agent, Viscotrol C, protruding Attapulgite, ethanol and the heating of deionized water composition stirring and dissolving; Chinese patent document CN10264989A also discloses a kind of preparation method of environment-friendly type aqueous white ink, but these product dispersion effects are desirable not enough.The invention provides a kind of environment-friendly blackboard writing liquid and manufacture method thereof, adopt " green technology " and " formula of science ", be intended to effectively solve the difficult wiping of conventional panels book ink, easily scumming, inequality out of ink, writes problem not smooth, poisonous, not environmental protection.By the particle diameter to cheekbone material, viscosity, storage layering and write the research of the technical problems such as infiltration, develop the environmental protection ink of good stability, be applicable to special environment-friendly blackboard writing pen.
Summary of the invention
The object of this invention is to provide a kind of environment-friendly blackboard writing liquid and preparation method thereof, not only technique is simple, and the product color of preparation is bright-coloured, out of ink evenly, fluent writing, does not stick with paste plate, easily wiping, steady quality, energy-conserving and environment-protective.
In order to address the above problem, the technical solution adopted in the present invention is:
A kind of environment-friendly blackboard writing liquid, is made up of the component of following weight part:
4.0 ~ 8.0 parts of pigment, 4.0 ~ 10.0 parts of membrane-forming agents, 3.0 ~ 8.0 parts of dispersion agents, 6.0 ~ 12.0 parts of wetting Agent for Printing Inkss, 3.0 ~ 5.0 parts of starch, 80.0 ~ 57.0 parts of solvents.
Described pigment is the one in white, yellow, red, blue four base colors of pigment.
Described resin is water-borne acrylic resin.
Described dispersion agent is polymkeric substance macromolecule dispersing agent.
Described wetting Agent for Printing Inks is polyoxyethylene glycol or glycol ethers.
Described solvent is ethanol.
A kind of environment-friendly blackboard writing liquid, is made up of the component of following weight part:
6.5 parts of pigment, 7.5 parts of water-borne acrylic resins, 68.5 parts of ethanol, 5.5 parts of polymkeric substance macromolecule dispersing agents, 8 parts of polyoxyethylene glycol, 4 parts of starch.
A preparation method for environment-friendly blackboard writing liquid, comprises the steps:
First solvent is added in pre-dispersed pot, under stirring, adds dispersion agent, membrane-forming agent, wetting Agent for Printing Inks by formula rate successively,
Until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 2 ~ 8 hours, make the diameter of granules of pigments reach specific standard size, stop grinding discharging.
Grain diameter after described granules of pigments grinds is D=300 ~ 700 nanometer.
the invention has the beneficial effects as follows:
(1) adopt micro-grinding technique, make granules of pigments median size reach 300 ~ 700 nanometers, and adopt polymkeric substance macromolecule dispersing agent, can be dissolved in fast in solvent, significantly reduce the viscosity of dispersion system in particulate process of lapping, improve pigment particles wetting property, shorten face section particle milling time, improve the dispersion stabilization in the long-time storage process of pigment dispersion system.
(2) use unique scientific formula, make ink there is good dispersion stabilization and lower viscosity, conscientiously meet fluid pressure type free ink pen nib pore size, prevent that ink leak, the problem such as dry and hard from occurring; Ink lovely luster, even, fluent writing out of ink, do not stick with paste plate, easily wiping, do not form dust; It is neutral that pH is, less to user's skin corrodibility.
(3) the present invention, under normal temperature or severe environment, all can normally write; In lower 1 year of bottled ink normal temperature, there is not layering, separation, precipitation iso-metamorphism phenomenon, can long-term storage, steady quality; Preparation technology is simple, and cost is low, energy-conserving and environment-protective.
Embodiment
Below by embodiment, the present invention is described in further details, these embodiment are only used for illustrating the present invention, do not limit the scope of the invention.
embodiment 1
Environment-friendly blackboard writing liquid, is made up of the component of following weight part:
4.0 parts of white pigments, 4.0 parts of water-borne acrylic resins, 3.0 parts of polymkeric substance macromolecule dispersing agents, 6.0 parts of polyoxyethylene glycol, 3 parts of starch, 80.0 parts of ethanol.
The preparation method of environment-friendly blackboard writing liquid, comprises the steps:
First ethanol is added in pre-dispersed pot, under stirring, add polymkeric substance macromolecule dispersing agent, water-borne acrylic resin, polyoxyethylene glycol by formula rate successively, until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 2 hours, make the diameter of granules of pigments reach 300 nanometers, stop grinding discharging.
embodiment 2
Environment-friendly blackboard writing liquid, is made up of the component of following weight part:
8.0 parts of yellow pigments, 10.0 parts of water-borne acrylic resins, 8.0 parts of polymkeric substance macromolecule dispersing agents, 12 parts of glycol ethers, 5 parts of starch, 57.0 parts of ethanol.
The preparation method of environment-friendly blackboard writing liquid, comprises the steps:
First ethanol is added in pre-dispersed pot, under stirring, add polymkeric substance macromolecule dispersing agent, water-borne acrylic resin, glycol ethers by formula rate successively, until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 8 hours, make the diameter of granules of pigments reach 700 nanometers, stop grinding discharging.
embodiment 3
Environment-friendly blackboard writing liquid, is made up of the component of following weight part:
6.5 parts of reds, 7.5 parts of water-borne acrylic resins, 68.5 parts of ethanol, 5.5 parts of polymkeric substance macromolecule dispersing agents, 8 parts of polyoxyethylene glycol, 4 parts of starch.
The preparation method of environment-friendly blackboard writing liquid, comprises the steps:
First ethanol is added in pre-dispersed pot, under stirring, add polymkeric substance macromolecule dispersing agent, water-borne acrylic resin, polyoxyethylene glycol by formula rate successively, until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 5 hours, make the diameter of granules of pigments reach 600 nanometers, stop grinding discharging.
embodiment 4
Environment-friendly blackboard writing liquid, is made up of the component of following weight part:
7 parts of white pigments, 8 parts of water-borne acrylic resins, 6 parts of polymkeric substance macromolecule dispersing agents, 10 parts of glycol ethers, 3 parts of starch, 66 parts of ethanol.
The preparation method of environment-friendly blackboard writing liquid, comprises the steps:
First ethanol is added in pre-dispersed pot, under stirring, add polymkeric substance macromolecule dispersing agent, water-borne acrylic resin, glycol ethers by formula rate successively, until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 4 hours, make the diameter of granules of pigments reach 500 nanometers, stop grinding discharging.
embodiment 5
Environment-friendly blackboard writing liquid, is made up of the component of following weight part:
6.0 parts of blue pigment, 6.0 parts of water-borne acrylic resins, 6.0 parts of polymkeric substance macromolecule dispersing agents, 8.0 parts of polyoxyethylene glycol, 4 parts of starch, 70.0 parts of ethanol.
The preparation method of environment-friendly blackboard writing liquid, comprises the steps:
First ethanol is added in pre-dispersed pot, under stirring, add polymkeric substance macromolecule dispersing agent, water-borne acrylic resin, polyoxyethylene glycol by formula rate successively, until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 6 hours, make the diameter of granules of pigments reach 500 nanometers, stop grinding discharging.
Claims (9)
1. an environment-friendly blackboard writing liquid, is characterized in that: the component by following weight part forms:
4.0 ~ 8.0 parts of pigment, 4.0 ~ 10.0 parts of membrane-forming agents, 3.0 ~ 8.0 parts of dispersion agents, 6.0 ~ 12.0 parts of wetting Agent for Printing Inkss, 3.0 ~ 5.0 parts of starch, 80.0 ~ 57.0 parts of solvents.
2. a kind of environment-friendly blackboard writing liquid according to claim 1, is characterized in that: described pigment is the one in white, yellow, red, blue four base colors of pigment.
3. a kind of environment-friendly blackboard writing liquid according to claim 1, is characterized in that: described membrane-forming agent is water-borne acrylic resin.
4. a kind of environment-friendly blackboard writing liquid according to claim 1, is characterized in that: described dispersion agent is polymkeric substance macromolecule dispersing agent.
5. a kind of environment-friendly blackboard writing liquid according to claim 1, is characterized in that: described wetting Agent for Printing Inks is polyoxyethylene glycol or glycol ethers.
6. a kind of environment-friendly blackboard writing liquid according to claim 1, is characterized in that: described solvent is ethanol.
7. an environment-friendly blackboard writing liquid, is characterized in that: the component by following weight part forms:
6.5 parts of pigment, 7.5 parts of water-borne acrylic resins, 68.5 parts of ethanol, 5.5 parts of polymkeric substance macromolecule dispersing agents, 8 parts of polyoxyethylene glycol, 4 parts of starch.
8. the preparation method of an environment-friendly blackboard writing liquid, it is characterized in that: first solvent is added in pre-dispersed pot, under stirring, add dispersion agent, membrane-forming agent, wetting Agent for Printing Inks by formula rate successively, until be all uniformly dissolved, finally add pigment, after being fully uniformly mixed, then carry out micro-grinding 2 ~ 8 hours, make the diameter of granules of pigments reach specific standard size, stop grinding discharging.
9. the preparation method of a kind of environment-friendly blackboard writing liquid according to claim 8, is characterized in that: the grain diameter after described granules of pigments grinds is D=300 ~ 700 nanometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065937.7A CN103819965A (en) | 2014-02-26 | 2014-02-26 | Environment-friendly board writing liquid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065937.7A CN103819965A (en) | 2014-02-26 | 2014-02-26 | Environment-friendly board writing liquid and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103819965A true CN103819965A (en) | 2014-05-28 |
Family
ID=50755269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410065937.7A Pending CN103819965A (en) | 2014-02-26 | 2014-02-26 | Environment-friendly board writing liquid and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN103819965A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925067A (en) * | 2016-07-04 | 2016-09-07 | 湖北世安科技有限公司 | Color paste used for preparing whiteboard marker ink and preparation method thereof |
| CN106883678A (en) * | 2017-03-28 | 2017-06-23 | 常州大学 | A kind of preparation method of environmentally friendly erasable liquid blackboard writing liquid |
| CN114350204A (en) * | 2020-10-13 | 2022-04-15 | 上海晨光文具股份有限公司 | White board pen ink, preparation method thereof and white board pen |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5961703A (en) * | 1997-08-15 | 1999-10-05 | J.S. Staedtler Gmbh & Co. | Aqueous ink having an extended cap-off time and process of manufacture thereof |
| CN1974693A (en) * | 2006-12-14 | 2007-06-06 | 苏州三威纳米科技有限公司 | Direct liquid type water pen ink and its making process |
-
2014
- 2014-02-26 CN CN201410065937.7A patent/CN103819965A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5961703A (en) * | 1997-08-15 | 1999-10-05 | J.S. Staedtler Gmbh & Co. | Aqueous ink having an extended cap-off time and process of manufacture thereof |
| CN1974693A (en) * | 2006-12-14 | 2007-06-06 | 苏州三威纳米科技有限公司 | Direct liquid type water pen ink and its making process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925067A (en) * | 2016-07-04 | 2016-09-07 | 湖北世安科技有限公司 | Color paste used for preparing whiteboard marker ink and preparation method thereof |
| CN106883678A (en) * | 2017-03-28 | 2017-06-23 | 常州大学 | A kind of preparation method of environmentally friendly erasable liquid blackboard writing liquid |
| CN114350204A (en) * | 2020-10-13 | 2022-04-15 | 上海晨光文具股份有限公司 | White board pen ink, preparation method thereof and white board pen |
| CN114350204B (en) * | 2020-10-13 | 2023-10-24 | 上海晨光文具股份有限公司 | Whiteboard pen ink, preparation method thereof and whiteboard pen |
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Application publication date: 20140528 |