CN110938223A - Method for preparing matte writing film in impression mode and matte writing film - Google Patents
Method for preparing matte writing film in impression mode and matte writing film Download PDFInfo
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- CN110938223A CN110938223A CN201911244282.9A CN201911244282A CN110938223A CN 110938223 A CN110938223 A CN 110938223A CN 201911244282 A CN201911244282 A CN 201911244282A CN 110938223 A CN110938223 A CN 110938223A
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
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- 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
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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Abstract
The invention provides a method for preparing a matte writing film in an impression mode, which comprises the following steps: (1) coating a first photocuring writing material on the surface of the PET substrate layer; (2) the PET substrate layer is subjected to light irradiation on a first light-cured writing material through a light-curing mechanism, so that the first light-cured writing material is cured and laminated, and a basic matte writing film layer is obtained; (3) coating a second photocuring writing material on the surface of the basic matte writing film layer; (4) baking in an oven for a certain time; (5) and irradiating the coating by using UV light to perform photocuring to obtain a matte surface layer, thus obtaining the finished matte writing film. The matte writing film prepared by the method has the advantages of smooth film surface and uniform matte glossiness, so that writing and wiping are smoother.
Description
Technical Field
The invention relates to the technical field of matte films, in particular to a method for preparing a matte writing film in an impression mode.
Background
In recent years, people gradually improve living standard, and gradually feel that a highlight writing film with high gloss reflects light seriously, so that the damage to the visual ability is great. Thus, matte writing films are widely used in graffiti or teaching. Currently, for the preparation of matte writing films, matting is usually performed by adding matting powder to resin coatings to perform matte effect. In recent years, due to the rising of environmental protection consciousness and the establishment of relevant regulations, the traditional matting powder does not meet the requirement of environmental protection in the current regulations; in addition, the viscosity of the coating and the particle size of the matting powder are strictly controlled by the traditional matte film; because the matting powder has insolubility and is easy to precipitate in the coating, the matte degree of the produced matte writing film is not uniform.
Therefore, it is necessary to provide a method for preparing a matte writing film by imprinting to solve the above problems.
Disclosure of Invention
The invention aims to provide a method for preparing a matte writing film in an impression mode.
In order to achieve the purpose, the invention provides a method for preparing a matte writing film in an impression mode, which comprises the following steps:
(1) coating a layer of first photocureable writing material on the surface of the PET substrate layer;
(2) the PET substrate layer containing the first photocuring writing material passes through a photocuring mechanism, the photocuring mechanism carries out photocuring on the first photocuring writing material to enable the first photocuring writing material to be cured and pressed, a base matte writing film layer is obtained, the photocuring mechanism comprises a roller wheel, a first fastening roller and a first curing light source device, the PET substrate layer containing the first photocuring writing material is located between the roller wheel and the first fastening roller, a plurality of concave parts are arranged on the outer surface of the roller wheel in an inwards concave mode, and the concave parts are of arc-shaped structures and the distance from the bottoms of the concave parts to the outer surface of the roller wheel is 2-3 um;
(3) coating a layer of second photocureable writing material on the surface of the basic matte writing film layer;
(4) placing the basic matte writing film layer coated with the second photocureable writing material obtained in the step (3) in an oven to be baked for a certain time, wherein the temperature of the oven is controlled to be 80-140 ℃;
(5) and irradiating the coating by using UV light to perform photocuring to obtain a matte surface layer, thus obtaining the finished matte writing film.
Compared with the prior art, this application writes the material at the first photocuring of PET substrate layer surface coating one deck, writes the material through photocuring mechanism to first photocuring and carries out illumination solidification and form the matte film layer of writing of basis, simple process, cost are lower, production efficiency is high. The outer surface of the roller is inwards provided with a plurality of concave parts to form a plurality of uneven surfaces, and a plurality of uneven structures can be formed on the surface of the basic matte writing film layer when the first photocuring writing material is pressed and photocured, so that the refraction and reflection of the surface of the basic matte writing film layer to light are reduced, low gloss is formed, and a matte effect is achieved. Wherein, set up the concave part into arc structure and the concave part bottom is to the distance of the surface of running roller is 2um-3um to form suitable matte gloss. And then coating a layer of second photocuring writing material on the surface of the basic matte writing film layer, baking the basic matte writing film layer in an oven for a certain time to remove the solvent, and then irradiating the coating layer by using UV light to perform photocuring to obtain a matte surface layer, so that the finished matte writing film is prepared, and the uniformity of the glossiness of the finished matte writing film is effectively improved. The finished matte writing film has the advantages of smooth film surface and uniform matte glossiness, so that writing and wiping are smoother.
Preferably, the first light-cured writing material is a UV light-cured material composition, and is UV-cured under UV illumination to form a cured layer, and the cured layer is tightly combined with the PET substrate layer to form the basic matte writing film layer. The first light-cured writing material comprises, by weight, 30-40 parts of polyurethane acrylate oligomer, 25-30 parts of pentaerythritol triacrylate, 20-40 parts of isobornyl acrylate and 4-6 parts of 2-hydroxy-methylphenyl propane-1-one.
Preferably, the second light-cured writing material comprises, by weight, 50 to 60 parts of polyurethane acrylate oligomer, 12 to 20 parts of trimethylolpropane triacrylate, 10 to 18 parts of 1, 6 hexanediol diacrylate, and 3.5 to 5.5 parts of 2-hydroxy-methylphenylpropane-1-one, and is diluted with a solvent so that the viscosity thereof is 20 to 100 pa.s. For example, the viscosity may be 20pa.s, 40pa.s, 60pa.s, 80pa.s, 100pa.s, preferably 40pa.s, at which not only the coating is uniform but also the coating thickness is very uniform after photocuring. Since the second photocurable writing material is miscible with the solvent, its viscosity can be adjusted to a suitable range.
Preferably, the thickness of the matte surface layer is 1-2 um.
Preferably, the solvent is selected from any one of ethyl acetate, butanone or n-propyl ester or a mixture thereof.
Preferably, the urethane acrylate oligomer is selected from the group consisting of tetrafunctional aliphatic urethane acrylate, hexafunctional aliphatic urethane acrylate and nonafunctional aliphatic urethane acrylate. Preferably hexafunctional aliphatic polyurethane acrylate, because hexafunctional aliphatic polyurethane acrylate has good flexibility and excellent wear resistance and scratch resistance.
Preferably, the photo-curing mechanism further comprises a second fastening roller, the second fastening roller and the first fastening roller are located at two sides of the roller wheel, and the uppermost end of the first fastening roller is lower than the circle center of the second fastening roller.
Preferably, the roller is of a transparent structure, and a second curing light source device is arranged in the roller.
Preferably, the width of the concave part is gradually increased from the bottom of the concave part to the outer surface of the roller
Preferably, the diameter of the first fastening roller position is smaller than that of the roller
Preferably, in the step (4), the baking time is 1 minute to 5 minutes.
Correspondingly, the application also provides a matte writing film prepared by the method for preparing the matte writing film in an impression mode.
Drawings
Fig. 1 is a schematic structural view of a matte writing film of the present application.
Fig. 2 is a schematic structural view of the photocuring mechanism for the base matte writing film layer shown in fig. 1.
Fig. 3 is an enlarged schematic view of a point a in fig. 2.
FIG. 4 is a schematic structural diagram of another embodiment of the photo-curing mechanism shown in FIG. 2.
Description of the symbols:
the matte writing film comprises a matte writing film 200, a light curing mechanism 100, a roller 10, a concave part 11, a first fastening roller 20, a first curing light source device 30, a second curing light source device 31, a second fastening roller 40, a PET substrate layer 50, a basic matte writing film layer 60 and a matte surface layer 70.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements.
Referring to fig. 1, the matte writing film 200, i.e., the finished matte writing film 200, includes a PET substrate layer 50, a basic matte writing film layer 60 disposed on the surface of the PET substrate layer 50, and a matte surface layer 70 disposed on the surface of the basic matte writing film layer 60. Wherein, the basic matte writing film layer 60 is made by photo-curing a first photo-curing writing material by a photo-curing mechanism 100, and the matte surface layer 70 is made by irradiating a second photo-curing writing material by UV light which is conventional in the art. Specifically, referring to fig. 2, the light curing mechanism 100 includes a roller 10, a first fastening roller 20 and a first curing light source device 30, a PET substrate layer 50 containing a first light curing writing material is located between the roller 10 and the first fastening roller 20, a plurality of concave portions 11 (referring to fig. 3) are concavely disposed on an outer surface of the roller 10, the concave portions 11 are arc-shaped, a distance H from bottoms of the concave portions 11 to the outer surface of the roller 10 is 2um to 3um, and the first curing light source device 30 can provide UV light irradiation to the first light curing writing material. That is, a plurality of uneven surfaces are formed through the concave portions 11 on the outer surface of the roller 10, and a plurality of uneven structures (as shown in fig. 1) are formed on the surface of the basic matte writing film layer 60 when the first photocuring writing material is pressed and photocured, so that the refraction and reflection of the surface of the basic matte writing film layer 60 to light are reduced, low gloss is formed, and a matte effect is achieved. In practice, the concave portion 11 may be prepared by a process such as sanding or laser drilling, and is not limited herein. The concave part 11 is in an arc structure, so that the basic matte writing film layer 60 is smooth when being stamped. Further, a plurality of concave parts 11 are arranged at equal intervals and distributed on the outer surface of the roller 10. Furthermore, the width of the concave part 11 is gradually increased from the bottom of the concave part 11 to the outer surface of the roller 10. When the roller 10 is used for imprinting the basic matte writing film layer 60, the first photocuring writing material can be more favorably formed into a cured layer, and the incomplete curing of part of the first photocuring writing material in the concave part 11 is avoided. Preferably, the junction of concave part 11 and the surface of running roller 10 is the arc structure, and it is inseparabler to be favorable to laminating when first photocuring to write material and the solidification of PET substrate layer, and adhesive force is strong.
Referring to fig. 4, the roller 10 is a transparent structure, and a second curing light source device 31 is disposed in the roller 10. The second curing light source device 31 and the first curing light source device 30 can both emit UV light sources to cure the first light-curable writing material, and the transparent structure can be penetrated by the light emitted from the first curing light source device 30 and the second curing light source device 31. The PET substrate layer 50 that contains first photocuring writing material passes through from the below of running roller 10, and second solidification light source device 31 is located running roller 10, can shine first photocuring writing material from the top, and light sees through running roller 10 direct irradiation first photocuring writing material, and the solidification is effectual. Further, the number of the second curing light source devices 31 is plural, and the plural second curing light source devices 31 are uniformly disposed in the roller 10. The roller 10 ensures that the first light-cured writing material is constantly irradiated by light and the intensity of the light is uniform in the rotating process, so that the curing effect is improved.
With reference to fig. 2, the light-curing mechanism 100 further includes a second fastening roller 40, the second fastening roller 40 and the first fastening roller 20 are located at two sides of the roller 10, and the uppermost end of the first fastening roller 20 is lower than the center of the second fastening roller 40. In the working process of curing and pressurizing, the basic matte writing film layer 60 passes through the space between the roller 10 and the first fastening roller 20 and reaches the upper part of the second fastening roller 40 from the lower part of the roller 10, so that the basic matte writing film layer 60 can be tightly attached to the lower part of the roller 10 at any time, the first photocuring writing material can be cured, and a cured layer with uniform thickness can be obtained. Further, the diameter of first fastening roller 20 is less than the diameter of running roller 10 for the dull and smooth rete 60 of basis has guaranteed in the transmission process of first fastening roller 20 and running roller 10 that the wrap angle of the dull and smooth rete 60 of basis satisfies sealed solidification's demand, and the great solidification efficiency that can improve first photocuring and write the material of running roller 10's diameter improves production efficiency simultaneously.
The method for producing a matte writing film by press-printing according to the present invention will be further described with reference to the following specific examples.
Example 1
A method for preparing a matte writing film in an impression mode comprises the following steps:
(1) coating a layer of first light-cured writing material on the surface of a PET substrate layer, wherein the first light-cured writing material comprises, by weight, 30 parts of polyurethane acrylic oligomer (hexafunctional aliphatic polyurethane acrylate, Changxing chemical industry, 6145-100H), 30 parts of pentaerythritol triacrylate, 25 parts of isobornyl acrylate and 5 parts of 2-hydroxy-methylphenyl propane-1-ketone;
(2) the method comprises the following steps that a PET base material layer containing a first photocuring writing material passes through a photocuring mechanism, the photocuring mechanism performs photocuring irradiation on the first photocuring writing material to enable the first photocuring writing material to be solidified and laminated to obtain a basic matte writing film layer, the photocuring mechanism comprises a roller, a first fastening roller and a first curing light source device, the PET base material layer containing the first photocuring writing material is located between the roller and the first fastening roller, a plurality of concave parts are concavely arranged in the outer surface of the roller, each concave part is of an arc-shaped structure, and the distance from the bottom of each concave part to the outer surface of the roller is 2 microns;
(3) coating a layer of second light-cured writing material on the surface of the basic matte writing film layer, wherein the second light-cured writing material comprises 50 parts of polyurethane acrylic oligomer, 20 parts of trimethylolpropane triacrylate, 10 parts of 1, 6 hexanediol diacrylate and 3.5 parts of 2-hydroxy-methylphenyl propane-1-ketone in parts by weight, and is diluted by ethyl acetate to ensure that the viscosity of the second light-cured writing material is 40 Pa.s;
(4) placing the basic matte writing film layer coated with the second photocuring writing material obtained in the step (3) in an oven to be baked for 5min, wherein the temperature of the oven is controlled at 120 ℃;
(5) and irradiating the coating by using UV light to perform photocuring to obtain a matte surface layer with the thickness of 1 mu m, thus obtaining the finished matte writing film.
Example 2
A method for preparing a matte writing film in an impression mode comprises the following steps:
(1) coating a layer of first light-cured writing material on the surface of a PET substrate layer, wherein the first light-cured writing material comprises, by weight, 35 parts of polyurethane acrylic oligomer (tetrafunctional aliphatic polyurethane acrylate, Yangxing chemical industry, 6165), 25 parts of pentaerythritol triacrylate, 30 parts of isobornyl acrylate and 4 parts of 2-hydroxy-methyl phenyl propane-1-ketone;
(2) the method comprises the following steps that a PET base material layer containing a first photocuring writing material passes through a photocuring mechanism, the photocuring mechanism performs photocuring irradiation on the first photocuring writing material to enable the first photocuring writing material to be solidified and laminated to obtain a basic matte writing film layer, the photocuring mechanism comprises a roller wheel, a first fastening roller and a first curing light source device, the PET base material layer containing the first photocuring writing material is located between the roller wheel and the first fastening roller, a plurality of concave parts are concavely arranged in the outer surface of the roller wheel, the concave parts are of arc structures, and the distance from the bottoms of the concave parts to the outer surface of the roller wheel is 3 microns;
(3) coating a layer of second light-cured writing material on the surface of the basic matte writing film layer, wherein the second light-cured writing material comprises, by weight, 60 parts of polyurethane acrylic oligomer, 15 parts of trimethylolpropane triacrylate, 18 parts of 1, 6 hexanediol diacrylate and 5.5 parts of 2-hydroxy-methylphenylpropane-1-one, and is diluted by butanone to ensure that the viscosity of the second light-cured writing material is 80 Pa.s;
(4) placing the basic matte writing film layer coated with the second photocuring writing material obtained in the step (3) in an oven to be baked for 1min, wherein the temperature of the oven is controlled at 130 ℃;
(5) and irradiating the coating by using UV light to perform photocuring to obtain a matte surface layer with the thickness of 1 mu m, thus obtaining the finished matte writing film.
Example 3
A method for preparing a matte writing film in an impression mode comprises the following steps:
(1) coating a layer of first light-cured writing material on the surface of a PET substrate layer, wherein the first light-cured writing material comprises 25 parts by weight of polyurethane acrylic oligomer (tetrafunctional aliphatic polyurethane acrylate, Changxing chemical industry, 6165), 26 parts by weight of pentaerythritol triacrylate, 40 parts by weight of isobornyl acrylate and 6 parts by weight of 2-hydroxy-methylphenyl propane-1-ketone;
(2) the method comprises the following steps that a PET base material layer containing a first photocuring writing material passes through a photocuring mechanism, the photocuring mechanism performs photocuring irradiation on the first photocuring writing material to enable the first photocuring writing material to be solidified and laminated to obtain a basic matte writing film layer, the photocuring mechanism comprises a roller, a first fastening roller and a first curing light source device, the PET base material layer containing the first photocuring writing material is located between the roller and the first fastening roller, a plurality of concave parts are concavely arranged in the outer surface of the roller, each concave part is of an arc-shaped structure, and the distance from the bottom of each concave part to the outer surface of the roller is 2 microns;
(3) coating a layer of second light-cured writing material on the surface of the basic matte writing film layer, wherein the second light-cured writing material comprises 55 parts by weight of polyurethane acrylic oligomer, 12 parts by weight of trimethylolpropane triacrylate, 14 parts by weight of 1, 6 hexanediol diacrylate and 4 parts by weight of 2-hydroxy-methylphenyl propane-1-ketone, and is diluted by adopting n-propyl ester to ensure that the viscosity of the second light-cured writing material is 80 Pa.s;
(4) placing the basic matte writing film layer coated with the second photocuring writing material obtained in the step (3) in an oven to be baked for 3min, wherein the temperature of the oven is controlled at 80 ℃;
(5) and irradiating the coating by using UV light to perform photocuring to obtain a matte surface layer with the thickness of 1 mu m, thus obtaining the finished matte writing film.
Examples 4 to 6
Examples 4-6 were prepared in essentially the same manner as example 1, except that:
in example 1, the viscosity of the second photocurable writing material in step (3) was adjusted to 40 pa.s; in example 4, the viscosity of the second photocurable writing material in step (3) was adjusted to 20 pa.s; in example 5, the viscosity of the second photocurable writing material in step (3) was adjusted to 60 pa.s; in example 6, the viscosity of the second photocurable writing material in step (3) was adjusted to 80 pa.s.
Comparative example 1
A method for preparing a matte writing film in an impression mode comprises the following steps:
(1) coating a layer of first light-cured writing material on the surface of a PET substrate layer, wherein the first light-cured writing material comprises, by weight, 80 parts of aliphatic polyurethane acrylate (hexafunctional aliphatic polyurethane acrylate, Yangxing chemical industry, 6145-100H), 30 parts of pentaerythritol triacrylate, 25 parts of isobornyl acrylate, 20 parts of trimethylolpropane triacrylate, 10 parts of 1, 6 hexanediol diacrylate and 8.5 parts of 2-hydroxy-methylphenyl propane-1-ketone;
(2) the PET substrate layer that will contain first photocuring writing material passes through photocuring mechanism, photocuring mechanism carries out shining of light to first photocuring writing material and makes its solidification and pressfitting, obtain mute light and write the rete, photocuring mechanism includes the running roller, first fastening roller and first solidification light source device, the PET substrate layer that contains first photocuring writing material is located between running roller and the first fastening roller, the surface indent of running roller is equipped with a plurality of concave parts, the concave part is arc structure and the distance of concave part bottom to the surface of running roller is 2 um.
The matte writing films obtained in examples 1 to 6 and comparative example 1 were subjected to a correlation performance test, and the test results are shown in table 1.
Gloss testing: after the light is reflected by the matte writing film, the amount of the reflected light is detected to confirm the gloss of the surface of the matte writing film. Testing an instrument: 60 ℃ gloss meter (HORIBA IG320) and calibration plate, reading accuracy 0.1 gloss units. The application tests the glossiness of three points on the same horizontal position of the matte writing film, namely the left point, the middle point and the right point, so as to judge and uniformity.
Wiping test: and (3) scrawling the same area on each matte writing film by adopting an oil pen, wiping the same area once by adopting a dry rag, and observing the surface appearance condition of the matte writing film.
Service life: and (3) fixing a writing pen on the surface of the film by using a testing instrument to repeatedly write and wipe whether the coating is worn out or not, and then reading the number of times of writing and wiping.
TABLE 1 test data for matte writing films
From the test results of examples 1-6 and comparative example 1, it can be seen that the matte surface layer formed by the second photocuring writing material can fill and level the places with irregular, uneven and pointed surface structures of the basic matte writing film layer, so that the surface structure is more mellow, and the prepared matte writing film has the advantages of mellow film surface and uniform matte glossiness, so that writing and wiping are smoother. In addition, compared with examples 4-6, it is seen that the viscosity of the second photo-curable writing material is 40pa.s, which is more beneficial for the second photo-curable writing material to uniformly coat the basic matte writing film layer, so that the photo-curing is more uniform, and the uniformity of the matte glossiness is improved. In contrast, in comparative example 1, the first photocurable writing material and the second photocurable writing material were photocured by the photocuring mechanism, but had low matte gloss but were not uniform, which affected writing and erasing.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for preparing a matte writing film in an impression mode is characterized by comprising the following steps:
(1) coating a layer of first photocureable writing material on the surface of the PET substrate layer;
(2) the PET substrate layer containing the first photocuring writing material passes through a photocuring mechanism, the photocuring mechanism carries out light irradiation on the first photocuring writing material to enable the first photocuring writing material to be cured and pressed, a base matte writing film layer is obtained, the photocuring mechanism comprises a roller, a first fastening roller and a first curing light source device, the first curing light source device provides UV light irradiation, the PET substrate layer containing the first photocuring writing material is located between the roller and the first fastening roller, a plurality of concave parts are arranged on the outer surface of the roller in an inwards concave mode, each concave part is of an arc-shaped structure, and the distance from the bottom of each concave part to the outer surface of the roller is 2-3 um;
(3) coating a layer of second photocureable writing material on the surface of the basic matte writing film layer;
(4) placing the basic matte writing film layer coated with the second photocureable writing material obtained in the step (3) in an oven to be baked for a certain time, wherein the temperature of the oven is controlled to be 80-140 ℃;
(5) and irradiating the coating by using UV light to perform photocuring to obtain a matte surface layer, thus obtaining the finished matte writing film.
2. The method of the claim 1, wherein the first light-curable writing material comprises, by weight, 30 to 40 parts of polyurethane acrylate oligomer, 25 to 30 parts of pentaerythritol triacrylate, 20 to 40 parts of isobornyl acrylate, and 4 to 6 parts of 2-hydroxy-methylphenyl propane-1-one.
3. The method of imprint-type production of matte writing film according to claim 1, wherein the second photocurable writing material comprises, in parts by weight, 50 to 60 parts of urethane acrylate oligomer, 12 to 20 parts of trimethylolpropane triacrylate, 10 to 18 parts of 1, 6-hexanediol diacrylate, and 3.5 to 5.5 parts of 2-hydroxy-methylphenylpropane-1-one, and is diluted with a solvent so that the viscosity thereof is 20 to 100 pa.s.
4. The method for preparing the matte writing film in an impressive manner according to claim 1, wherein the thickness of the matte surface layer is 1-2 um.
5. The method for the embossed production of matte writing films according to claim 1, wherein the solvent is selected from any one of ethyl acetate, butanone, or n-propyl ester, or a mixture thereof.
6. The method of embossed producing matte writing films according to claim 2 or 3, wherein the urethane acrylate oligomer is selected from tetrafunctional aliphatic urethane acrylate, hexafunctional aliphatic urethane acrylate, or nonafunctional aliphatic urethane acrylate.
7. The method for manufacturing the matte writing film in an embossing manner according to claim 1, wherein the photo-curing mechanism further comprises a second fastening roller, the second fastening roller and the first fastening roller are positioned on both sides of the roller wheel, and the uppermost end of the first fastening roller is lower than the center of the second fastening roller.
8. The method for impression-type preparation of matte writing films according to claim 1, wherein the roller is of a transparent structure, and a second curing light source device is arranged in the roller.
9. The method for press-printing preparation of matte writing films according to claim 1, wherein the width of the concave portion is gradually increased from the bottom of the concave portion to the outer surface of the roller.
10. A matte writing film produced by the method for producing a matte writing film by press-printing according to any one of claims 1 to 9.
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