CN104140727A - Writing and projecting dual-purpose finishing coat and preparing method thereof - Google Patents
Writing and projecting dual-purpose finishing coat and preparing method thereof Download PDFInfo
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- CN104140727A CN104140727A CN201410378987.0A CN201410378987A CN104140727A CN 104140727 A CN104140727 A CN 104140727A CN 201410378987 A CN201410378987 A CN 201410378987A CN 104140727 A CN104140727 A CN 104140727A
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Abstract
The invention discloses a writing and projecting dual-purpose finishing coat and a preparing method thereof and relates to the technical field of teaching writing board finishing coat and multimedia projectors. The writing and projecting dual-purpose finishing coat is composed of, by weight, 20-25% of melamine-formaldehyde resin, 25-30% of acrylic acid resin, 0.5-1.5% of dispersant, 1.5-3% of tinting pigment, 8-15% of anti-setting agent, 10-18% of abrasion resistance padding, 1-2% of curing agent, 2-5% of flatting agent and 20-30% of water, and the writing and projecting dual-purpose finishing coat is formed through mixing, grinding and filtering. The writing and projecting dual-purpose finishing coat has the advantages of being low in glossiness, moderate in roughness and easy to prepare. A projection image can be directly displayed on a writing board by using the writing board made of the writing and projecting dual-purpose finishing coat, the projection image is clear, all parts can be clearly watched, and meanwhile wiring of a teacher on the writing board is not influence. The writing and projecting dual-purpose finishing coat is good in manufacturability and free of pollution.
Description
Technical field
The present invention relates to protecting teaching writing board finish paint and multimedia overhead projector utensil technical field.
Background technology
The clipboard of present most of school has been replaced by steel plate with baking paint formula clipboard; there is easy-to-write and erasable; the advantage of protection student eyesight; but cannot be used in conjunction with the projector being equipped with; projected background adopts curtain formula mostly; in use substantially clipboard is hidden, affect teacher and carry out writing on the blackboard, make troubles to teaching.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and writes and dual-purpose finish paint of projection and preparation method thereof, has glossiness low, and roughness is moderate, is easy to the feature of preparation; The clipboard that uses this finish paint to make can directly be presented at projected image on clipboard, and projected picture is clear, and each position all can clearly be watched, and does not also affect teacher and carries out writing on the blackboard simultaneously; And good manufacturability, pollution-free.
For solving the problems of the technologies described above, the technical solution used in the present invention is: one is write and the dual-purpose finish paint of projection, is made up of the raw material of following mass percent:
Terpolycyantoamino-formaldehyde resin 20-25%,
Acrylic resin 25-30%,
Dispersion agent 0.5-1.5%,
Tinting pigment 1.5-3%,
Anti-settling agent 8-15%,
Wear resistant filler 10-18%,
Solidifying agent 1-2%,
Matting agent 2-5%,
Water 20-30%;
Make through mixing, grinding, filtration.
Preferably, dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent.
Preferably, tinting pigment is white, silver gray or beige tinting pigment.
Preferably, wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1-3.
Preferably, solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
Write and the preparation method of the dual-purpose finish paint of projection, specifically comprise the steps:
(1) first terpolycyantoamino-formaldehyde resin, acrylic resin, dispersion agent, anti-settling agent and the water speed high-speed mixing with 800-1000r/min in container is disperseed to 10-15 minute, then drop in sand mill and be ground to below fineness 20um;
(2) in above-mentioned slurry, add tinting pigment, matting agent, wear resistant filler and solidifying agent again, speed high-speed mixing with 800-1000 r/min is even, is transferred to needed color, gloss, is 100-140 second being coated with-4 glasss of medium viscosities, finally use strainer filterings more than 300 orders, packaging.
Preferably, dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent.
Preferably, tinting pigment is white, silver gray or beige tinting pigment.
Preferably, wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1-3.
Preferably, solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
Finish paint of the present invention can be at fast setting at 224-232 DEG C of PMT (metal sheet temperature), uses blank Special writing pen to write, and writing is clear, not reflective.
Terpolycyantoamino-formaldehyde resin in raw material of the present invention and acrylic resin are main body filmogen.
Dispersion agent adopts the PAA-402 dispersion agent of Shandong Heng Lian Chemical Co., Ltd., for a kind of lower molecular weight, water-based, high-efficiency anion dispersion agent, main component is sodium polyacrylate, there is effect wetting and that disperse, there is suitable consistency with resin, needed time of dispersion process and energy are reduced, and can prevent from mutually assembling between wear resistant filler, also can promote that tinting pigment is effectively scattered in system, improve gloss, tinting strength and opacifying power, supporting capacity to wear resistant filler and tinting pigment is strong, in dispersion process, can keep lower foam production rate, can keep the stable viscosity of system after lacquering.
Anti-settling agent adopts the FP-88 anti-settling agent of Linan, Hangzhou coatings additive(s) Chemical Co., Ltd., is anion surfactant, and pigment, wear resistant filler, resin are had to powerful adsorption, forms coating as thin as a wafer, prevents that pigment from sinking to the bottom, and do not lump.
Taking water as solvent, make not have in the production of this finish paint and use procedure the discharge of toxic and harmful, and save energy, can not produce combustion phenomena.
Tinting pigment adopts white, silver gray or beige tinting pigment, color and luster is soft, use the clipboard projectable that this finish paint makes and write dual-purpose, each tinting pigment number can determine the depth of color, therefore can increase as required tinting pigment number.
Matting agent adopts white carbon black, is conducive to disperse in water-based system, and adjustable finish paint glossiness, improves paint film and write plate body bonding strength, increases hardness of paint film.
Wear resistant filler adopts the mixture of ceramics powder and Graphite Powder 99, wherein ceramics powder is hard material, mainly play wear-resistant effect, in enamelled coating, mainly play skeleton, Graphite Powder 99 is flexible material, mainly play anti-attrition effect, play the frictional force reducing between friction pair, ceramics powder and the combination of Graphite Powder 99 soft or hard, the mass ratio of ceramics powder and Graphite Powder 99 is 1:1-1:3, neither too hard, nor too soft, play good antiwear and reducing friction effect.
Solidifying agent adopts metatitanic acid three Virahol tertiary amine esters, is beneficial to resin solidification, make paint dry soon and also paint film hard, be not afraid of scuffing.
The beneficial effect that adopts technique scheme to produce is:
(1) good manufacturability, pollution-free.Finish paint of the present invention is aqueous finish paint, there is no the discharge of toxic and harmful in production and use procedure, and energy-conserving and environment-protective, and Heat stability is good are nonflammable, store convenient transportation.
(2) finish paint glossiness of the present invention is low, and conventional clipboard glossiness is within 12 glossiness, is adjusted to 5 gloss and finish paint of the present invention is minimum, greatly reduces the eye injury causing due to reflective.
(3) finish paint surface uniform of the present invention, result of use are good, and roughness is moderate, and are easy to preparation.
(4) clipboard that uses finish paint of the present invention to make can directly be presented at projected image on clipboard, and projected picture is clear, and each position all can clearly be watched, and does not also affect teacher and carries out writing on the blackboard simultaneously.
Embodiment
The raw materials used market of the present invention is all on sale, and wherein PAA-402 dispersion agent is purchased from Shandong Heng Lian Chemical Co., Ltd.; FP-88 anti-settling agent is purchased from Linan, Hangzhou coatings additive(s) Chemical Co., Ltd.; White carbon black is purchased from Dongying City Xin Da Chemical Co., Ltd.; Ceramics powder is purchased from Guangzhou Zhen Wei Chemical Industry Science Co., Ltd; Graphite Powder 99 is purchased from Qingdao Chen Yang graphite company limited; Solidifying agent is purchased from Xuzhou Chinaresearch Science&Technology Industry Co., Ltd.; Acrylic resin and terpolycyantoamino-formaldehyde resin are purchased from Japanese ippon company.
Embodiment 1
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 20%, acrylic resin 27%, dispersion agent 0.5%, tinting pigment 3%, anti-settling agent 10%, wear resistant filler 10%, solidifying agent 1.5%, matting agent 4%, water 24%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is color white pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
Write and the preparation method of the dual-purpose finish paint of projection, specifically comprise the steps:
(1) by said ratio, first terpolycyantoamino-formaldehyde resin, acrylic resin, dispersion agent, anti-settling agent and the water speed high-speed mixing with 800r/min in container is disperseed 15 minutes, then drop in sand mill and be ground to below fineness 20um;
(2) in above-mentioned slurry, add tinting pigment, matting agent, wear resistant filler and solidifying agent again, speed high-speed mixing with 900r/min is even, is transferred to needed color, gloss, is 100-140 second being coated with-4 glasss of medium viscosities, finally use strainer filterings more than 300 orders, packaging.
Embodiment 2
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 22%, acrylic resin 28%, dispersion agent 0.5%, tinting pigment 2%, anti-settling agent 8%, wear resistant filler 15%, solidifying agent 1.5%, matting agent 3%, water 20%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is silver gray tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:2; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The speed of step (1) high speed blending dispersion is 900r/min, and the time is 12 minutes; The speed that step (2) high speed is mixed is 1000r/min.
Embodiment 3
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 21%, acrylic resin 26%, dispersion agent 1.2%, tinting pigment 1.5%, anti-settling agent 9%, wear resistant filler 11%, solidifying agent 1%, matting agent 2.3%, water 27%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is beige tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:3; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The speed of step (1) high speed blending dispersion is 1000r/min, and the time is 10 minutes; The speed that step (2) high speed is mixed is 800r/min.
Embodiment 4
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 23%, acrylic resin 25%, dispersion agent 0.5%, tinting pigment 1.5%, anti-settling agent 15%, wear resistant filler 12%, solidifying agent 1%, matting agent 2%, water 20%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is silver gray tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black; Water is distilled water.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The time of step (1) high speed blending dispersion is 14 minutes.
Embodiment 5
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 20%, acrylic resin 25%, dispersion agent 0.5%, tinting pigment 1.5%, anti-settling agent 8%, wear resistant filler 18%, solidifying agent 2%, matting agent 5%, water 20%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is beige tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1.5; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black; Water is distilled water.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The speed of step (1) high speed blending dispersion is 900r/min, and the time is 11 minutes; The speed that step (2) high speed is mixed is 800r/min.
Embodiment 6
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 25%, acrylic resin 27.5%, dispersion agent 1%, tinting pigment 1.5%, anti-settling agent 12%, wear resistant filler 10%, solidifying agent 1%, matting agent 2%, water 20%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is color white pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:2.5; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black; Water is distilled water.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The speed of step (1) high speed blending dispersion is 1000r/min, and the time is 11 minutes; The speed that step (2) high speed is mixed is 1000r/min.
Embodiment 7
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 20%, acrylic resin 30%, dispersion agent 0.5%, tinting pigment 1.5%, anti-settling agent 9%, wear resistant filler 16%, solidifying agent 1%, matting agent 2%, water 20%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is beige tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1.2; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black; Water is distilled water.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The speed that step (2) high speed is mixed is 1000r/min.
Embodiment 8
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 20%, acrylic resin 29%, dispersion agent 0.5%, tinting pigment 1.5%, anti-settling agent 8%, wear resistant filler 17%, solidifying agent 1%, matting agent 2%, water 21%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is silver gray tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1.8; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The time of step (1) high speed blending dispersion is 13 minutes; The speed that step (2) high speed is mixed is 800r/min.
Embodiment 9
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 24%, acrylic resin 25%, dispersion agent 0.5%, tinting pigment 1.5%, anti-settling agent 13%, wear resistant filler 11%, solidifying agent 1%, matting agent 2%, water 22%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is color white pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:2.2; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black; Water is distilled water.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is proportioning raw materials; The speed of step (1) high speed blending dispersion is 900r/min, and the time is 13 minutes.
Embodiment 10
One is write and the dual-purpose finish paint of projection, and its raw material by following mass percent forms: terpolycyantoamino-formaldehyde resin 20%, acrylic resin 25%, dispersion agent 1.5%, tinting pigment 2.5%, anti-settling agent 8%, wear resistant filler 10%, solidifying agent 1%, matting agent 2%, water 30%.
Dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent; Tinting pigment is silver gray tinting pigment; Wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1; Solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
This writes the preparation method with embodiment 1 with the preparation method of the dual-purpose finish paint of projection, and difference is that the speed of proportioning raw materials and step (1) high speed blending dispersion is 1000r/min, and the time is 12 minutes; The speed that step (2) high speed is mixed is 800r/min.
Adopt writing and the dual-purpose finish paint of the projection disposable surface of steel plate that is coated on respectively of preparing in above-mentioned ten embodiment, coating layer thickness is 20um, and toast more than 1 minute at 224-232 DEG C, after moulding, travelling belt is sent, naturally cooling, after completing, the paint film forming is carried out to Performance Detection, detected result is as follows:
From detected result, can show that of the present invention writing and the dual-purpose finish paint of projection forms hardness after paint film, resistance to solvent, salt spray resistance effect better, light fastness is good, and adhesion effect is good, and glossiness is low≤and 12, minimumly be adjusted to 5 gloss, greatly reduce the eye injury causing due to reflective.The clipboard that uses finish paint of the present invention to make can directly be presented at projected image on clipboard, and projected picture is clear, no-reflection, and each position all can clearly be watched.
Claims (10)
1. write and the dual-purpose finish paint of projection, it is characterized in that its raw material by following mass percent forms:
Terpolycyantoamino-formaldehyde resin 20-25%,
Acrylic resin 25-30%,
Dispersion agent 0.5-1.5%,
Tinting pigment 1.5-3%,
Anti-settling agent 8-15%,
Wear resistant filler 10-18%,
Solidifying agent 1-2%,
Matting agent 2-5%,
Water 20-30%;
Make through mixing, grinding, filtration.
2. according to claim 1 writing and the dual-purpose finish paint of projection, is characterized in that described dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent.
3. according to claim 1 writing and the dual-purpose finish paint of projection, is characterized in that described tinting pigment is for white, silver gray or beige tinting pigment.
4. according to claim 1 writing and the dual-purpose finish paint of projection, is characterized in that described wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1-3.
5. according to claim 1 writing and the dual-purpose finish paint of projection, is characterized in that described solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
6. as claimed in claim 1 writing and the preparation method of the dual-purpose finish paint of projection, is characterized in that specifically comprising the steps:
(1) first terpolycyantoamino-formaldehyde resin, acrylic resin, dispersion agent, anti-settling agent and the water speed high-speed mixing with 800-1000r/min in container is disperseed to 10-15 minute, then drop in sand mill and be ground to below fineness 20um;
(2) in above-mentioned slurry, add tinting pigment, matting agent, wear resistant filler and solidifying agent again, speed high-speed mixing with 800-1000r/min is even, is transferred to needed color, gloss, is 100-140 second being coated with-4 glasss of medium viscosities, finally use strainer filterings more than 300 orders, packaging.
7. according to claim 6 writing and the preparation method of the dual-purpose finish paint of projection, is characterized in that described dispersion agent is PAA-402 dispersion agent; Anti-settling agent is FP-88 anti-settling agent.
8. according to claim 6 writing and the preparation method of the dual-purpose finish paint of projection, is characterized in that described tinting pigment is for white, silver gray or beige tinting pigment.
9. according to claim 6 writing and the preparation method of the dual-purpose finish paint of projection, is characterized in that described wear resistant filler is the mixture of ceramics powder and Graphite Powder 99, and wherein the mass ratio of ceramics powder and Graphite Powder 99 is 1:1-3.
10. according to claim 6 writing and the preparation method of the dual-purpose finish paint of projection, is characterized in that described solidifying agent is metatitanic acid three Virahol tertiary amine esters; Matting agent is white carbon black.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378987.0A CN104140727B (en) | 2014-08-04 | 2014-08-04 | Write and project dual-purpose finish paint and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378987.0A CN104140727B (en) | 2014-08-04 | 2014-08-04 | Write and project dual-purpose finish paint and preparation method thereof |
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| Publication Number | Publication Date |
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| CN104140727A true CN104140727A (en) | 2014-11-12 |
| CN104140727B CN104140727B (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410378987.0A Active CN104140727B (en) | 2014-08-04 | 2014-08-04 | Write and project dual-purpose finish paint and preparation method thereof |
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| CN104629503A (en) * | 2015-01-24 | 2015-05-20 | 宁波高新区夏远科技有限公司 | Wipe-easy portable blackboard film and preparation method thereof |
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| CN101781500A (en) * | 2010-02-05 | 2010-07-21 | 谢立华 | Color paste for green blackboard coating and method for manufacturing coating special for maintaining green blackboard |
| CN102108248A (en) * | 2011-01-07 | 2011-06-29 | 谢立华 | Preparation method of water-based environment-friendly silver gray low-light paint for writing board and color paste of paint |
| CN102153925A (en) * | 2011-01-07 | 2011-08-17 | 谢立华 | Manufacturing method of baking paint of silver gray low-light writing board and color paste used thereby |
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| CN101781500A (en) * | 2010-02-05 | 2010-07-21 | 谢立华 | Color paste for green blackboard coating and method for manufacturing coating special for maintaining green blackboard |
| CN102108248A (en) * | 2011-01-07 | 2011-06-29 | 谢立华 | Preparation method of water-based environment-friendly silver gray low-light paint for writing board and color paste of paint |
| CN102153925A (en) * | 2011-01-07 | 2011-08-17 | 谢立华 | Manufacturing method of baking paint of silver gray low-light writing board and color paste used thereby |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104140727B (en) | 2016-06-22 |
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Address after: 052160 No.6 Fengchan Road, Shijiazhuang Economic and Technological Development Zone, Hebei Province Patentee after: Shijiazhuang Keda Education Equipment Co.,Ltd. Address before: 052160 No.6 Fengchan Road, Shijiazhuang Economic and Technological Development Zone, Hebei Province Patentee before: SHIJIAZHUANG KEDA STATIONERY Co.,Ltd. |