CN109627853A - Reversible thermochromic color pencil lead and preparation method thereof and pencil - Google Patents
Reversible thermochromic color pencil lead and preparation method thereof and pencil Download PDFInfo
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- CN109627853A CN109627853A CN201910019303.0A CN201910019303A CN109627853A CN 109627853 A CN109627853 A CN 109627853A CN 201910019303 A CN201910019303 A CN 201910019303A CN 109627853 A CN109627853 A CN 109627853A
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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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Abstract
The present invention relates to a kind of Reversible thermochromic color pencil lead, the component including following parts by weight: 3-15 parts of adhesive；15-40 parts of temperature-sensitive mill base；1-8 parts of wax；2-10 parts of stearic acid；0-5 parts of palm wax；0-2 parts and filler material 30-70 parts of emulsifier, the temperature-sensitive mill base includes thermosensitive chromotropic paint, color developing agent, solvent and addition auxiliary agent, the partial size of the temperature-sensitive mill base is 1-10 μm, the temperature-sensitive mill base is microcapsules pigment, the temperature-sensitive mill base develops the color at normal temperature, it quickly fades when temperature rises to 60 DEG C or so, primary colors can be restored when temperature is down to -20 DEG C or so.It joined temperature-sensitive mill base in this lead for retractable pencil, lead for retractable pencil normally develops the color in room temperature use, when needing to wipe; it with person's handwritings such as the material frictions such as common erasing rubber or other resins, rubber text or patterns, fades after person's handwriting is heated, erasing person's handwriting work can be completed; any scrap will not be generated, it is very environmentally friendly.
Description
Technical field
The present invention relates to lead for retractable pencils, and in particular to a kind of Reversible thermochromic color pencil lead and preparation method thereof and uses this lead
The pencil of core preparation.
Background technique
Thermochromatic material, the early stage of development are substantially irreversible thermochromatic material, are mainly used for the coating class of temperature indicating, such as exist
It is used as overtemperature alarm coating in oil refining apparatus, is used to refer in aircraft industry in the surface temperature distribution and instrument of material extensively
Colour coupler etc. on the heat-sensitive paper of application.These thermochromatic materials are mostly inorganic metal class thermochromatic material, discoloring temperature all compared with
Height, the thermometric upper limit can be more than 1200 DEG C.Since the eighties in last century, the developing trend of external thermochromatic material is in low temperature and can
Inverse two aspect, there are a series of new varieties in low-temp reversible thermochromatic material, especially in recent years along with microencapsulation technology
Application, there are many new varieties in thermochromatic material, and application surface has also been extended to textile, print from initial temperature indicating effect
The various aspects of the daily lifes such as brush, coating, toy, anti-fake, kitchen article and amusement.In culture and education industry discoloration pencil, ball
The products such as pen oil and color changeable nail enamel, toy have all come out, and greatly enrich people's lives.Colored pencil at present
Be mostly it is non-erasable, can not to drawing case or text repaired or removed, also have partial colour pencil that can use rubber
Skin erasing, but still light trace can be left, while a certain amount of scrap can be generated, pollution is made into surrounding enviroment.
Summary of the invention
In order to overcome drawbacks described above, the present invention provides a kind of Reversible thermochromic color pencil lead, which, which has, writes resistance
Power is small, not easy to break and bending, modification when the characteristics of not generating any scrap.
The present invention is to solve technical solution used by its technical problem:
A kind of Reversible thermochromic color pencil lead, the component including following parts by weight: 3-15 parts of adhesive；Temperature-sensitive mill base
15-40 parts；1-8 parts of wax；2-10 parts of stearic acid；0-5 parts of palm wax；0-2 parts and filler material 30-70 parts of emulsifier.
Preferably, the temperature-sensitive mill base includes thermosensitive chromotropic paint, color developing agent, solvent and addition auxiliary agent, the temperature-sensitive color
The partial size of slurry is 1-10 μm.
Preferably, the temperature-sensitive mill base is microcapsules pigment, which develops the color at normal temperature, when temperature rises to 60 DEG C
It quickly fades when left and right, primary colors can be restored when temperature is down to -20 DEG C or so.
Preferably, the adhesive is one of adragant, Arabic gum, peach gum, cellulose and water-soluble dextrin
Or it is a variety of.
Preferably, the wax is one of paraffin, microwax, Fischer-Tropsch wax, animal wax and vegetable wax or a variety of.
Preferably, the emulsifier is fatty alcohol polyoxyethylene ether, castor oil and ethylene oxide condensate, rilanit special
With one of ethylene oxide condensate, tween and cithrol or a variety of.
Preferably, the filler material is one of talcum powder, kaolin, calcium carbonate, diatomite or a variety of.
The present invention also provides a kind of preparation methods of Reversible thermochromic color pencil lead, and steps are as follows:
Step 1: weighing adhesive, temperature-sensitive mill base, wax, stearic acid, palm wax, emulsifier and the filler material of formula ratio, will
Above-mentioned material is added in kneader, mediates 50-80 minutes at being 45-55 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
Also a kind of temperature-sensitive possibility of reversal discoloration colored pencil of the present invention, by above-mentioned Reversible thermochromic color pencil lead by digging
Slot, glue core, plane bar and lacquering technique are prepared.
The beneficial effects of the present invention are:
1) it is neutral to be different from Reversible thermochromic for polymer encapsulation system for the Reversible thermochromic mill base that the present invention uses
Ink, mill base particles are larger, and particle diameter distribution is wider, are more easier that precipitating or flocculation occurs, while avoiding technique again
The destruction to microcapsules is stirred or grinds in the process, therefore the preparation and selection of mill base are increasingly complex, in addition, master is molten in microcapsules
The compatibility of agent and cosolvent is larger to the Effect of Thermal Performance of mill base, so the stability of mill base itself and compound system is compatible
Property be all influence this product quality an important factor for；
2) present invention has display color at normal temperature relative to common lead for retractable pencil and common color lead for retractable pencil, this temperature-sensitive lead for retractable pencil,
When lead for retractable pencil is heated to certain temperature, color is completely disappeared, and lead for retractable pencil is still colourless when being then restored to room temperature by high temperature, works as temperature
Its color is restored to original colored state when continuing to be reduced to critical-temperature (colour temp).This Reversible thermochromic colour lead
Core be mainly using have Reversible thermochromic mill base, then cooperate the raw materials such as wax, adhesive, filler material through kneading, squeeze out,
The process such as drying, freezing are prepared.Smooth, transition interval is narrow, color with writing for color pencil lead produced by the present invention
Can combination free, it is bright in luster, discoloration it is obvious the features such as；
3) it joined temperature-sensitive mill base in this lead for retractable pencil, lead for retractable pencil normally develops the color in room temperature use, when needing to wipe, using common
Erasing rubber or the person's handwritings such as material frictions text or pattern such as other resins, rubber, fade after person's handwriting is heated, erasing can be completed
Writing work, will not generate any scrap, very environmentally friendly；And this product can just reply primary colors down to -20 DEG C or so in temperature, because
This person's handwriting being wiped free of in normal circumstances will not secondary color.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
A kind of Reversible thermochromic color pencil lead of the present invention, the component including following parts by weight: 3-15 parts of adhesive；Heat
Quick mill base 15-40 parts；1-8 parts of wax；2-10 parts of stearic acid；0-5 parts of palm wax；0-2 parts and filler material 30-70 parts of emulsifier.This
In formula, carry out sticking together combination by adhesive, wax, stearic acid and temperature-sensitive mill base, and after paying creative test several times
This proportion is obtained, temperature-sensitive mill base is made to be uniformly dispersed under this proportion in the system, emulsifier mainly increases the flowing of lead for retractable pencil
Property and lubricity simultaneously there is certain emulsifying capacity so that this system more merges.It joined temperature-sensitive mill base in this lead for retractable pencil,
Lead for retractable pencil normally develops the color when room temperature use, when needing to wipe, with the material frictions text such as common erasing rubber or other resins, rubber
Or the person's handwritings such as pattern, it fades after person's handwriting is heated, erasing person's handwriting work can be completed, any scrap will not be generated, it is very environmentally friendly；And
And this product the person's handwriting that temperature can just reply primary colors down to -20 DEG C or so, therefore be wiped free of in normal circumstances will not secondary color.
The temperature-sensitive mill base includes thermosensitive chromotropic paint, color developing agent, solvent and addition auxiliary agent, the partial size of the temperature-sensitive mill base
It is 1-10 μm, not easy coloring if partial size is too thin, the too thick smoothness that will affect pen core again；The temperature-sensitive mill base is microcapsules face
Material, which develops the color at normal temperature, quickly fades when temperature rises to 60 DEG C or so, when temperature is down to -20 DEG C or so
It can restore primary colors.
Common mill base is that the pigment particles of reunion are separated into stable dispersion by high speed dispersion-grinding combination
Liquid, and Reversible thermochromic mill base is a microcapsule systems, and by selecting suitable microcapsule wall material, thermo-sensitive material is carried out
Encapsulation.It is in medium water and with good stability that microencapsulation can be such that thermosensitive pigment particle is evenly dispersed in, and has
Prevent pigment particles from reuniting or precipitating again to effect.Containing there are three types of substances in microcapsules: colour former, color developing agent, solvent etc..Low temperature
It is solidified with solvent when room temperature, colour former and color developing agent are fixed together by solvent, and electron exchange reaction, color occur therebetween
Slurry colour developing.When heating, solvent heat absorption separates colour former in conjunction with solvent and with color developing agent, and the electronics hindered between the two passes
Lead, and so that color is rapidly disappeared, while upon a drop in temperature, due in solvent colour former and color developing agent be still discrete state,
Therefore colorless state is still kept, until temperature is reduced to solvent solidification color developing agent and is precipitated in a solvent and colour former is made to show it
Intrinsic colour realizes color with the characteristic for remembering variation of temperature；
Temperature-sensitive mill base in the present invention is the chief component of Reversible thermochromic color pencil lead, including providing color
Thermosensitive chromotropic paint (i.e. colour former), color developing agent, solvent and addition auxiliary agent etc..It is polymer encapsulation system, is shown at normal temperature
Show certain color, (about 60 DEG C) quickly fade after heated, when temperature drops to room temperature, remain as colourless, it is necessary to be cooled to-
20 DEG C or so can just be restored to original colored state, have very wide colour killing-secondary color temperature, i.e., " hysteresis quality ".This temperature-sensitive color
Possibility of reversal is starched, from colourless to coloured or from coloured to colourless, this temperature-sensitive mill base is commercial product.The temperature-sensitive mill base thermo-color machine
Reason is intermolecular chemical reaction, the organic matter (colour former) of itself many not no thermochromic behavior, (aobvious with other compounds
Toner) mixing, the generation of thermal change colour response is had after heating.Dominant mechanism is intermolecular electronics transfer: due to intermolecular electronics
The Reversible Organic Thermochromic Materials for shifting and generating thermo-color are most commonly used a kind of thermochromatic materials of Recent study, it
Colour former and color developing agent be electronq donor and electron acceptor, when the temperature varies, electronq donor and electricity respectively
Reversible chemical reaction occurs for sub- acceptor, gives and receives by electronics between them, molecular structure changes, and causes
Reversible change occurs for color.The research of current this kind of thermochromic materials and is selected by testing different colour formers
Suitable color developing agent and temperature regulator, be made it is a series of it is rich in color, discoloration is obvious, sensitivity is higher, has application prospect
Organic thermochromatic material.
The adhesive is one of adragant, Arabic gum, peach gum, cellulose and water-soluble dextrin or a variety of.
The adhesive assigns the intensity that lead for retractable pencil needs, and guarantees the writing quality of product, while avoiding in pencil production and use process
Break core.The wax is one of paraffin, microwax, Fischer-Tropsch wax, animal wax and vegetable wax or a variety of.The emulsifier is rouge
Fat alcohol polyoxyethylene ether, castor oil and ethylene oxide condensate, rilanit special and ethylene oxide condensate, tween and poly- second two
One of alcohol fatty acid ester is a variety of.The emulsifier is fatty alcohol polyoxyethylene ether, and molecular formula is RO- (CH2CH2O) n-H,
Wherein R is alkyl, and n is positive integer, and wherein n is 10,15 or 20；The tween is polysorbate40, polysorbate60 or Tween 80, castor-oil plant
Oil/rilanit special and ethylene oxide condensate such as EL-30,40,60, cithrol such as PEG400MS etc..It is described
Filler material is one of talcum powder, kaolin, calcium carbonate, diatomite or a variety of.
This Reversible thermochromic color pencil lead the preparation method is as follows:
Step 1: weighing adhesive, temperature-sensitive mill base, wax, stearic acid, palm wax, emulsifier and the filler material of formula ratio, will
Above-mentioned material is added in kneader, mediates 50-80 minutes at being 45-55 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
The preparation of pencil: it is prepared by above-mentioned Reversible thermochromic color pencil lead by channeling, glue core, plane bar and lacquering technique
And there must be the pencil of the lead for retractable pencil.
Embodiment 1:
Component including following parts by weight:
3 parts of adragant；15 parts of yellow temperature-sensitive mill base；1 part of microwax；2 parts of stearic acid；1 part of palm wax；Fatty alcohol polyoxy
0.1 part and 30 parts of talcum powder of vinethene；
Preparation method:
Step 1: adragant, yellow temperature-sensitive mill base, microwax, the stearic acid, palm wax, fatty alcohol of formula ratio are weighed
Above-mentioned material is added in kneader for polyoxyethylene ether and talcum powder, mediates 50 minutes at being 45 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
Embodiment 2:
Component including following parts by weight:
6 parts of cellulose；20 parts of red temperature-sensitive mill base；5 parts of paraffin；6 parts of stearic acid；3 parts of palm wax；Castor oil and epoxy second
0.5 part and 40 parts of kaolin of alkane condensation product；
Preparation method:
Step 1: cellulose, red temperature-sensitive mill base, paraffin, stearic acid, palm wax, castor oil and the ring of formula ratio are weighed
Above-mentioned material is added in kneader for oxidative ethane condensation product and kaolin, mediates 60 minutes at being 50 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
Embodiment 3:
Component including following parts by weight:
8 parts of sodium carboxymethylcellulose；26.4 parts of blue temperature-sensitive mill base；3.5 parts of paraffin；4.3 parts of stearic acid；Palm wax 2.4
Part；0.3 part and 55.1 parts of kaolin of polysorbate60；
Preparation method:
Step 1: Arabic gum, the blue temperature-sensitive mill base, Fischer-Tropsch wax, stearic acid, palm wax, polysorbate60 of formula ratio are weighed
And diatomite, above-mentioned material is added in kneader, is mediated 80 minutes at being 55 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
Embodiment 4:
Component including following parts by weight:
12 parts of Arabic gum；35 parts of red temperature-sensitive mill base；6 parts of Fischer-Tropsch wax；8 parts of stearic acid；4 parts of palm wax；Polysorbate60
1.5 parts and 60 parts of diatomite；
Preparation method:
Step 1: Arabic gum, the red temperature-sensitive mill base, Fischer-Tropsch wax, stearic acid, palm wax, polysorbate60 of formula ratio are weighed
And diatomite, above-mentioned material is added in kneader, is mediated 80 minutes at being 55 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
Embodiment 5:
Component including following parts by weight:
15 parts of Arabic gum；40 parts of red temperature-sensitive mill base；8 parts of Fischer-Tropsch wax；10 parts of stearic acid；5 parts of palm wax；Polysorbate60 2
Part and 70 parts of diatomite；
Preparation method is the same as embodiment 4.
Embodiment 6:
Component including following parts by weight:
3 parts of Arabic gum；15 parts of red temperature-sensitive mill base；1 part of microwax；2 parts and 30 parts of talcum powder of stearic acid；
Preparation method:
Step 1: weighing Arabic gum, red temperature-sensitive mill base, microwax, stearic acid and the talcum powder of formula ratio, will be above-mentioned
Material is added in kneader, mediates 80 minutes at being 55 DEG C in temperature；
Step 2: the material in kneader is gone out into double screw extruder and is granulated, and is ground to required water through three-roller
Point, then material is squeezed into core, and dry at 40-45 DEG C, lead for retractable pencil is obtained, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is shown
The Reversible thermochromic color pencil lead of color.
Comparative example 1: commercially available common light colored pencil；Comparative example 2: commercially available Mitsubishi's board colored pencil.
Test result:
Lead for retractable pencil bending strength made from embodiment 1-6 is 2000-2500MPa, and lead for retractable pencil made from embodiment 1-5 is write suitable
Sliding, bright-colored, written trace can be easily wiped free of using the materials such as common rubber or other resins, rubber, and not had
Generate any scrap；Lead for retractable pencil made from embodiment 6 writes the product that smoothness is not so good as embodiment 1-5, and color is more bright-coloured, writes trace
Mark can be easily wiped free of using common rubber, and without generating any scrap；Therefore it is added in this formula a certain amount of
Emulsifier more can guarantee the smoothness that product is write；
The person's handwriting color that pencil writing in comparative example 1 comes out is very light, and smooth performance is poor, and if using common rubber
Skin can generate certain scrap when wiping；
The person's handwriting that pencil writing in comparative example 2 comes out is bright in luster, smooth better performances, but uses common erasing rubber
Except when, very painstakingly, and light trace can be left, removing is not thorough, while can also generate certain scrap；
To sum up, after this system is compounded by other compositions in temperature-sensitive mill base and formula, not only make lead for retractable pencil that there is color
Color bright-coloured, the characteristics of fluent writing, and using the principle of temperature-sensitive mill base reversible color, when erasing, is faded by heating so that book
Writing trace is not finding of naked eye, has achieved the purpose that erasing, without generating any scrap, this product belongs to the head in lead for retractable pencil field
Wound, has a vast market foreground.
It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the premise, may be used also
To make several modifications and improvements, these are all within the scope of protection of the present invention.Therefore, the scope of protection of the patent of the present invention should be with
Subject to appended claims.
Claims (9)
1. a kind of Reversible thermochromic color pencil lead, it is characterised in that: the component including following parts by weight: adhesive 3-15
Part；15-40 parts of temperature-sensitive mill base；1-8 parts of wax；2-10 parts of stearic acid；0-5 parts of palm wax；0-2 parts of emulsifier and filler material 30-70
Part.
2. Reversible thermochromic color pencil lead according to claim 1, it is characterised in that: the temperature-sensitive mill base includes temperature-sensitive
Camouflage paint, color developing agent, solvent and addition auxiliary agent, the partial size of the temperature-sensitive mill base are 1-10 μm.
3. Reversible thermochromic color pencil lead according to claim 2, it is characterised in that: the temperature-sensitive mill base is microcapsules
Pigment, the temperature-sensitive mill base develop the color at normal temperature, quickly fade when temperature rises to 60 DEG C or so, when temperature is down to -20 DEG C or so
When can restore primary colors.
4. Reversible thermochromic color pencil lead according to claim 1, it is characterised in that: the adhesive is astragalus tree
One of glue, Arabic gum, peach gum, cellulose and water-soluble dextrin are a variety of.
5. Reversible thermochromic color pencil lead according to claim 1, it is characterised in that: the wax be paraffin, microwax,
One of Fischer-Tropsch wax, animal wax and vegetable wax are a variety of.
6. Reversible thermochromic color pencil lead according to claim 1, it is characterised in that: the emulsifier is poly alkyl alcohol
Ethylene oxide ether, castor oil and ethylene oxide condensate, rilanit special and ethylene oxide condensate, tween and polyethylene glycol fatty
One of acid esters is a variety of.
7. Reversible thermochromic color pencil lead according to claim 1, it is characterised in that: the filler material be talcum powder,
One of kaolin, calcium carbonate, diatomite are a variety of.
8. a kind of preparation method of Reversible thermochromic color pencil lead according to claim 1-7, feature exist
In: steps are as follows:
Step 1: weighing adhesive, temperature-sensitive mill base, wax, stearic acid, palm wax, emulsifier and the filler material of formula ratio, will be above-mentioned
Material is added in kneader, mediates 50-80 minutes at being 45-55 DEG C in temperature；
Step 2: the material in kneader being gone out into double screw extruder and is granulated, and is ground to required moisture through three-roller, then
Material is squeezed into core, and is dried at 40-45 DEG C, obtains lead for retractable pencil, lead for retractable pencil does not develop the color at this time；
Step 3: the lead for retractable pencil for again obtaining step 2 is put in the refrigerator-freezer lower than -20 DEG C and freezes 24 hours or more, is developed the color
Reversible thermochromic color pencil lead.
The colored pencil 9. a kind of temperature-sensitive possibility of reversal changes colour, it is characterised in that: by the Reversible thermochromic color pencil lead of claim 8
It is prepared by channeling, glue core, plane bar and lacquering technique.
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| CN201910019303.0A CN109627853A (en) | 2019-01-09 | 2019-01-09 | Reversible thermochromic color pencil lead and preparation method thereof and pencil |
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| CN201910019303.0A CN109627853A (en) | 2019-01-09 | 2019-01-09 | Reversible thermochromic color pencil lead and preparation method thereof and pencil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112646422A (en) * | 2020-12-22 | 2021-04-13 | 真彩文具股份有限公司 | Preparation process of thermosensitive color-changing lead core |
| CN112646421A (en) * | 2020-12-23 | 2021-04-13 | 真彩文具股份有限公司 | Thermosensitive reversible color-changing colored lead and pencil thereof |
| CN114381170A (en) * | 2021-12-28 | 2022-04-22 | 上海晨光文具股份有限公司 | Flexible oil painting stick and preparation method thereof |
| CN114806281A (en) * | 2022-03-24 | 2022-07-29 | 安硕文教用品（上海）股份有限公司 | Anti-mildew water-soluble colored pencil lead and preparation process thereof |
| CN116203187A (en) * | 2023-01-17 | 2023-06-02 | 青岛双鲸药业股份有限公司 | Method for measuring water content of soft capsule shell |
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| CN112646421A (en) * | 2020-12-23 | 2021-04-13 | 真彩文具股份有限公司 | Thermosensitive reversible color-changing colored lead and pencil thereof |
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