CN109291697B - Writing board - Google Patents

Writing board Download PDF

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Publication number
CN109291697B
CN109291697B CN201811121946.8A CN201811121946A CN109291697B CN 109291697 B CN109291697 B CN 109291697B CN 201811121946 A CN201811121946 A CN 201811121946A CN 109291697 B CN109291697 B CN 109291697B
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parts
writing
adhesive layer
base material
layer
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CN201811121946.8A
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CN109291697A (en
Inventor
刘泽江
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UC Nano Technologies Inc
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UC Nano Technologies Inc
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Priority to CN202110186785.6A priority Critical patent/CN113147232A/en
Priority to CN202110186801.1A priority patent/CN113246639A/en
Priority to CN201811121946.8A priority patent/CN109291697B/en
Priority to CN202110182723.8A priority patent/CN113212040A/en
Priority to CN202110172504.1A priority patent/CN113147231B/en
Publication of CN109291697A publication Critical patent/CN109291697A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/04—Blackboards
    • B43L1/10—Writing surfaces thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking

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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)
  • Drawing Aids And Blackboards (AREA)
  • Paints Or Removers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a writing board, which comprises a support plate and a writing film, wherein the writing film is attached to the surface of one side of the support plate, the writing film further comprises a base material and a matte coating layer coated on one surface of the base material, the other surface of the base material is connected with the support plate in an adhesive manner through an adhesive layer, the matte coating layer is obtained through a coating material under the irradiation of ultraviolet light, and the coating material comprises the following components in parts by weight: aliphatic polyurethane triacrylate, 1,6 hexanediol diacrylate, ethylene glycol diglycidyl ether, alkyl-modified polysiloxane, 2-methyl methacrylate, hydroxytoluene butyl ester, organic thermosetting polymethyl urea resin, 4-acryloyl morpholine, sulfonyloxy ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and a coloring pigment. The writing board disclosed by the invention can be used for smoothly writing and resisting scraping, and meanwhile, the process of etching the glass surface by using strong acid is replaced, so that the writing board is more environment-friendly.

Description

Writing board
Technical Field
The invention relates to the field of teaching equipment, in particular to a writing board.
Background
The preparation method of the blackboard on the market at present comprises the steps of etching toughened glass on the surface by strong acid, carrying out black silk-screen printing on the non-etched surface, and simultaneously attaching a transparent explosion-proof film behind the silk-screen printing layer. The pollution of chemical etching is strong, the degree of surface etching is not easy to control, the writing effect is not good due to the fact that etching is light, and after writing is seriously performed, a trace is not easy to wipe clean; in addition, a plurality of procedures such as glass etching, silk screen printing, explosion-proof film pasting and the like are required, so that the cost is high and the process is complicated.
The ultraviolet curing technology is an ink-jet technology for curing a monomer, an oligomer or a polymer matrix under the induction of ultraviolet light, the technology is widely applied in the prior printing field, particularly the application in the digital printing technology is more common, along with the continuous innovation of the technology, the continuous progress and the perfection of the digital printing technology and the ultraviolet curing technology, the ultraviolet curing digital printing technology generated by combining the digital printing technology and the ultraviolet curing technology is rapidly developed and accounts for higher and higher proportion in the digital printing industry. The ultraviolet curing technology has the advantages of high curing speed, high production efficiency, good mechanical and physical properties, little pollution, energy conservation and the like, and is praised as a green technology.
In an ultraviolet light curing resin system, a photoinitiator plays an important role in curing a prepolymer, is activated by ultraviolet radiation to generate an active intermediate, and initiates the reaction of the prepolymer or a monomer to form a high polymer material with a cross-linked structure. However, the conventional ultraviolet curing system has a serious phenomenon of oxygen inhibition, which is a phenomenon in which radicals are consumed in the presence of oxygen in a radical photopolymerization system to affect a polymerization reaction. When a photopolymerization system is cured in air, oxygen in the air can lead the photocuring surface to be incompletely cured and sticky, thus seriously affecting the overall performance of the photocuring material, and particularly, the volume shrinkage after curing greatly affects the adhesion, hardness and the like.
Disclosure of Invention
The invention aims to provide the writing board which effectively avoids the oxygen inhibition phenomenon of the coating material, has high printing precision, improves the product yield, and has high curing speed and high curing hardness of the coating material.
In order to achieve the purpose, the invention adopts the technical scheme that: a writing board comprises a support plate and a writing film, wherein the writing film is attached to the surface of one side of the support plate;
the writing film further comprises a base material and a matte coating layer coated on one surface of the base material, and the other surface of the base material is connected with the support plate in an adhesive manner through an adhesive layer;
the matte coating layer is obtained by coating materials under ultraviolet irradiation, and the coating materials comprise the following components in parts by weight:
15-30 parts of aliphatic polyurethane triacrylate,
30-50 parts of 1, 6-hexanediol diacrylate,
10-15 parts of ethylene glycol diglycidyl ether,
1-5 parts of alkyl modified polysiloxane,
1-2.5 parts of 2-methyl methacrylate,
0.8 to 1.2 parts of butyl hydroxytoluene,
2-4 parts of organic thermosetting polymethyl urea resin,
0.8 to 1.2 parts of 4-acryloyl morpholine,
1-5 parts of sulfonyloxy ketone,
8-10 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone,
6-8 parts of a coloring pigment;
the coating material is obtained by the following steps:
(1) adding 15-30 parts of aliphatic polyurethane triacrylate, 30-50 parts of 1, 6-hexanediol diacrylate, 10-15 parts of ethylene glycol diglycidyl ether and 1-5 parts of alkyl modified polysiloxane into a stirring dispersion machine, and mixing at a stirring speed of 400-600 r/min for 20min to obtain a mixture 1;
(2) adding 1-5 parts of sulfonyloxy ketone, 8-10 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.8-1.2 parts of hydroxytoluene butyl ester, 2-4 parts of organic thermosetting polymethyl urea resin, 0.8-1.2 parts of 4-acryloyl morpholine, 1-2.5 parts of 2-methyl methacrylate and a coloring pigment into the mixture 1 obtained in the step (1), and continuously mixing for 10min at a stirring speed of 350-450 r/min to obtain a mixture 2;
(3) and (3) grinding the mixture 2 obtained in the step (2) until the particle size is 300-350 nm, so as to obtain the coating material.
The technical scheme of further improvement in the technical scheme is as follows:
1. in the scheme, the weight ratio of the aliphatic polyurethane triacrylate to the 1,6 hexanediol diacrylate is 1: 2.
2. In the scheme, the particle size of the coloring pigment is 10-15 mu m.
3. In the scheme, the viscosity of the coating material at 25 ℃ is 15-30 cp.
4. In the above scheme, the substrate is one of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polypropylene or polyethylene.
5. In the above scheme, the base material is a composite material of two or more of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polypropylene and polyethylene.
6. In the above scheme, the adhesive layer is an acrylic polyester adhesive layer, an organic silicon adhesive layer, a polyurethane adhesive layer, an epoxy adhesive layer or an AB adhesive layer.
7. In the scheme, the supporting plate is a glass layer or a metal plate layer or a plastic composite plate layer.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:
1. the writing board adopts the matte coating layer to form the writing surface, can smoothly write and resist scraping, and simultaneously replaces the process of etching the glass surface by strong acid, thereby being more environment-friendly; in addition, the writing film is directly installed and fixed with the supporting frame, an explosion-proof film and the like do not need to be attached, the process is saved, and meanwhile the stability and the safety of the structure are guaranteed.
2. According to the writing board, 1-5 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone and 8-10 parts of sulfonyloxy ketone are added into a coating material system, so that the crosslinking rate of ethylene glycol diglycidyl ether, 1,6 hexanediol diacrylate and aliphatic polyurethane triacrylate in the coating material is improved, the curing rate is high, the oxygen inhibition phenomenon of the coating material is effectively avoided, the printing precision is high, and the yield of products is improved.
3. According to the writing board, 0.8-1.2 parts of hydroxytoluene butyl ester and 2-4 parts of organic thermosetting polymethyl urea resin are added into a coating material system, so that the curing hardness and scratch resistance of the coating material are improved, the viscosity and surface tension of the coating material containing 6-8 parts of coloring pigment are reduced, and the stability is good.
Drawings
FIG. 1 is a schematic diagram of a writing board structure according to the present invention.
In the above drawings: 1. a substrate; 2. a matte coating layer; 3. an adhesive layer; 4. a support plate; 5. a writing film.
Detailed Description
The invention is further described below with reference to the following examples:
examples 1 to 4: a writing board comprises a support plate 4 and a writing film 5, wherein the writing film 5 is attached to the surface of one side of the support plate 4;
the writing film 5 further comprises a base material 1 and a matte coating layer 2 coated on one surface of the base material 1, and the other surface of the base material 1 is connected with the support plate 4 in an adhesive manner through an adhesive layer 3;
the matte coating layer 2 is obtained by coating a coating material under ultraviolet irradiation, wherein the coating material comprises the following components in parts by weight, and is shown in table 1:
TABLE 1
Components Example 1 Example 2 Example 3 Example 4
Aliphatic polyurethane triacrylate 20 portions of 24 portions of 18 portions of 27 portions of
1,6 hexanediol diacrylate 40 portions of 48 portions of 36 portions of 35 portions of
Ethylene glycol diglycidyl ether 11 portions of 13 portions of 12 portions of 12 portions of
Alkyl modified polysiloxane 3 portions of 4.5 parts of 2.5 parts of 3.5 parts of
2-Methylacrylate 2 portions of 1.3 parts of 2.3 parts of 1.5 parts of
Hydroxytoluene butyl ester 1.0 part 1.2 parts of 0.8 portion of 0.9 portion
Organic thermosetting polymethyl urea resin 3 portions of 2 portions of 4 portions of 2 portions of
4-acryloyl morpholine 1.0 part 0.9 portion 1.1 parts of 1.0 part
Sulfonyloxy ketones
2 portions of 4 portions of 3 portions of 2 portions of
2-hydroxy-2-methyl-1-phenyl-1-propanone 9.5 parts of 8.5 parts of 10 portions of 9 portions of
Coloured pigments 8 portions of 6 portions of 6 portions of 7 portions of
The coating material is obtained by the following steps:
(1) adding 15-30 parts of aliphatic polyurethane triacrylate, 30-50 parts of 1, 6-hexanediol diacrylate, 10-15 parts of ethylene glycol diglycidyl ether and 1-5 parts of alkyl modified polysiloxane into a stirring dispersion machine, and mixing at a stirring speed of 400-600 r/min for 20min to obtain a mixture 1;
(2) adding 1-5 parts of sulfonyloxy ketone, 8-10 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.8-1.2 parts of hydroxytoluene butyl ester, 2-4 parts of organic thermosetting polymethyl urea resin, 0.8-1.2 parts of 4-acryloyl morpholine, 1-2.5 parts of 2-methyl methacrylate and a coloring pigment into the mixture 1 obtained in the step (1), and continuously mixing for 10min at a stirring speed of 350-450 r/min to obtain a mixture 2;
(3) and (3) grinding the mixture 2 obtained in the step (2) until the particle size is 300-350 nm, so as to obtain the coating material.
The particle size of the colored pigment is 10 to 15 μm.
The viscosity of the coating material is 15-30 cp at 25 ℃.
Example 1: the substrate 1 is a polymethyl methacrylate (PMMA) layer; the adhesive layer 3 is an acrylic acid polyester adhesive layer; the support plate 4 is a glass layer.
Example 2: the substrate 1 is a Polycarbonate (PC) layer; the adhesive layer 3 is an organic silicon adhesive layer; the support plate 4 is a metal plate layer.
Example 3: the substrate 1 is a polyethylene terephthalate (PET) layer; the adhesive layer 3 is a polyurethane adhesive layer; the support plate 4 is a plastic composite plate layer.
Example 4: the above substrate 1 is a polyethylene terephthalate (PET) layer; the adhesive layer 3 is an acrylic acid polyester adhesive layer; the support plate 4 is a metal plate layer.
Comparative examples 1 to 2: a writing board comprises a support plate 4 and a writing film 5, wherein the writing film 5 is attached to the surface of one side of the support plate 4;
the writing film 5 further comprises a base material 1 and a matte coating layer 2 coated on one surface of the base material 1, and the other surface of the base material 1 is connected with the support plate 4 in an adhesive manner through an adhesive layer 3;
the matte coating layer 2 is obtained by coating a coating material under ultraviolet irradiation, wherein the coating material comprises the following components in parts by weight, as shown in table 2:
TABLE 2
Components Comparative example 1 Comparative example 2
Aliphatic polyurethane triacrylate 17 portions of 28 portions of
1,6 hexanediol diacrylate 46 portions of 39 portions of
Ethylene glycol diglycidyl ether 13 portions of 11 portions of
Alkyl modified polysiloxane 1.5 parts of 3 portions of
2-Methylacrylate 2.1 parts of 1.7 parts of
Hydroxytoluene butyl ester 0.9 portion -
Organic thermosetting polymethyl urea resin 3 portions of -
4-acryloyl morpholine 1.2 parts of 0.9 portion
Sulfonyloxy ketones - 3 portions of
2-hydroxy-2-methyl-1-phenyl-1-propanone - 10 portions of
Pigment BK7 7 portions of 7 portions of
The indexes of detection of the present example and the comparative example are shown in Table 3:
TABLE 3
Figure DEST_PATH_IMAGE002
As can be seen from Table 3, the coating material had good hardness, low viscosity and smooth printing. The writing board adopts the matte coating layer to form the writing surface, can smoothly write and resist scraping, and simultaneously replaces the process of etching the glass surface by strong acid, thereby being more environment-friendly; in addition, the writing film is directly installed and fixed with the support frame, an explosion-proof film and the like do not need to be attached, the process is saved, and the stability and the safety of the structure are guaranteed; secondly, 1-5 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone and 8-10 parts of sulfonyloxy ketone are added into a coating material system, so that the crosslinking rate of ethylene glycol diglycidyl ether, 1,6 hexanediol diacrylate and aliphatic polyurethane triacrylate in the coating material is improved, the curing rate is high, the oxygen inhibition phenomenon of the coating material is effectively avoided, the printing precision is high, and the product yield is improved; and thirdly, 0.8-1.2 parts of hydroxytoluene butyl ester and 2-4 parts of organic thermosetting polymethyl urea resin are added into the coating material system, so that the curing hardness of the coating material is improved, the coating material is scratch-resistant, the viscosity and the surface tension of the coating material containing 6-8 parts of coloring pigment are reduced, and the stability is good.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (8)

1. A writing board characterized by: the writing board comprises a supporting plate (4) and a writing film (5), and the writing film (5) is attached to the surface of one side of the supporting plate (4);
the writing film (5) further comprises a base material (1) and a matte coating layer (2) coated on one surface of the base material (1), and the other surface of the base material (1) is connected with the support plate (4) in an adhesive manner through an adhesive layer (3);
the matte coating layer (2) is obtained by coating materials under ultraviolet irradiation, and the coating materials comprise the following components in parts by weight:
15-30 parts of aliphatic polyurethane triacrylate,
30-50 parts of 1, 6-hexanediol diacrylate,
10-15 parts of ethylene glycol diglycidyl ether,
1-5 parts of alkyl modified polysiloxane,
1-2.5 parts of 2-methyl methacrylate,
0.8 to 1.2 parts of butyl hydroxytoluene,
2-4 parts of organic thermosetting polymethyl urea resin,
0.8 to 1.2 parts of 4-acryloyl morpholine,
1-5 parts of sulfonyloxy ketone,
8-10 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone,
6-8 parts of a coloring pigment;
the coating material is obtained by the following steps:
(1) adding 15-30 parts of aliphatic polyurethane triacrylate, 30-50 parts of 1, 6-hexanediol diacrylate, 10-15 parts of ethylene glycol diglycidyl ether and 1-5 parts of alkyl modified polysiloxane into a stirring dispersion machine, and mixing at a stirring speed of 400-600 r/min for 20min to obtain a mixture 1;
(2) adding 1-5 parts of sulfonyloxy ketone, 8-10 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.8-1.2 parts of hydroxytoluene butyl ester, 2-4 parts of organic thermosetting polymethyl urea resin, 0.8-1.2 parts of 4-acryloyl morpholine, 1-2.5 parts of 2-methyl methacrylate and a coloring pigment into the mixture 1 obtained in the step (1), and continuously mixing for 10min at a stirring speed of 350-450 r/min to obtain a mixture 2;
(3) and (3) grinding the mixture 2 obtained in the step (2) until the particle size is 300-350 nm, so as to obtain the coating material.
2. A tablet according to claim 1, wherein: the weight ratio of the aliphatic polyurethane triacrylate to the 1,6 hexanediol diacrylate is 1: 2.
3. A tablet according to claim 1, wherein: the particle size of the coloring pigment is 10-15 mu m.
4. A writing board according to any one of claims 1 to 3, wherein: the viscosity of the coating material at 25 ℃ is 15-30 cp.
5. A tablet according to claim 1, wherein: the base material (1) is one of polymethyl methacrylate (PMMA), Polycarbonate (PC), polyethylene terephthalate (PET), polypropylene (PP) or Polyethylene (PE).
6. A tablet according to claim 1, wherein: the base material (1) is a composite material of two or more of polymethyl methacrylate (PMMA), Polycarbonate (PC), polyethylene terephthalate (PET), polypropylene (PP) and Polyethylene (PE).
7. A tablet according to claim 1, wherein: the adhesive layer (3) is an acrylic acid polyester adhesive layer, an organic silicon adhesive layer, a polyurethane adhesive layer, an epoxy adhesive layer or an AB adhesive layer.
8. A tablet according to claim 1, wherein: the supporting plate (4) is a glass layer or a metal plate layer or a plastic composite plate layer.
CN201811121946.8A 2018-09-26 2018-09-26 Writing board Active CN109291697B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202110186785.6A CN113147232A (en) 2018-09-26 2018-09-26 Writing panel for intelligent blackboard
CN202110186801.1A CN113246639A (en) 2018-09-26 2018-09-26 Writing board for teaching
CN201811121946.8A CN109291697B (en) 2018-09-26 2018-09-26 Writing board
CN202110182723.8A CN113212040A (en) 2018-09-26 2018-09-26 Multifunctional teaching blackboard
CN202110172504.1A CN113147231B (en) 2018-09-26 2018-09-26 Teaching writing blackboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811121946.8A CN109291697B (en) 2018-09-26 2018-09-26 Writing board

Related Child Applications (4)

Application Number Title Priority Date Filing Date
CN202110186801.1A Division CN113246639A (en) 2018-09-26 2018-09-26 Writing board for teaching
CN202110186785.6A Division CN113147232A (en) 2018-09-26 2018-09-26 Writing panel for intelligent blackboard
CN202110182723.8A Division CN113212040A (en) 2018-09-26 2018-09-26 Multifunctional teaching blackboard
CN202110172504.1A Division CN113147231B (en) 2018-09-26 2018-09-26 Teaching writing blackboard

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CN109291697B true CN109291697B (en) 2021-02-02

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CN202110172504.1A Active CN113147231B (en) 2018-09-26 2018-09-26 Teaching writing blackboard
CN202110182723.8A Pending CN113212040A (en) 2018-09-26 2018-09-26 Multifunctional teaching blackboard
CN201811121946.8A Active CN109291697B (en) 2018-09-26 2018-09-26 Writing board
CN202110186785.6A Pending CN113147232A (en) 2018-09-26 2018-09-26 Writing panel for intelligent blackboard

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CN106398353B (en) * 2016-09-20 2021-06-15 浙江世窗光学薄膜制造有限公司 Coating composition and preparation method thereof
CN206465663U (en) * 2016-12-15 2017-09-05 厦门凤升磁电科技有限公司 A kind of matt frosting flexible blackboard
CN107325642B (en) * 2017-08-24 2021-01-29 广州亦盛环保科技有限公司 UV ink-jet printing ink, preparation method and application thereof
CN107415367A (en) * 2017-09-07 2017-12-01 东莞中世拓实业有限公司 A kind of novel flexible clipboard and preparation method thereof
CN108047854B (en) * 2017-12-27 2020-04-21 江苏宏泰高分子材料有限公司 Water-based ultraviolet-curing BMC high-temperature-resistant coating
CN108314945B (en) * 2018-03-21 2020-07-03 福州外语外贸学院 Blackboard and preparation method thereof
CN108427513A (en) * 2018-05-17 2018-08-21 苏州泛普科技股份有限公司 Integral and intelligent teaching equipment
CN108556524A (en) * 2018-05-18 2018-09-21 苏州泛普科技股份有限公司 Eye-protecting type Combined teaching blackboard

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CN113147231B (en) 2023-03-14
CN113246639A (en) 2021-08-13
CN113147232A (en) 2021-07-23
CN113212040A (en) 2021-08-06
CN109291697A (en) 2019-02-01

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