CN111793448A - Preparation method and processing equipment of ultrathin quantum dot film - Google Patents
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Abstract
The invention provides a preparation method and processing equipment of an ultrathin quantum dot film, and relates to the technical field of liquid crystal display.A release protective film is always attached to the relatively far side surfaces of two barrier films at the stage of initial unreeling until a quantum dot glue solution layer is coated in the production preparation process and is solidified and formed between the two barrier films, and the two barrier films are gradually peeled off by a tearing roller group when the quantum dot glue solution layer is solidified and reaches a reeling stage by the release protective film to obtain the ultrathin quantum dot film, namely the quantum dot glue solution layer and the two barrier film layers positioned at the outer sides of the quantum dot glue solution layer; the method effectively solves the problems of wrinkling and warping of the quantum dot film in the traction curing process caused by over-thinness of the film layer in the prior art in the direct preparation of the ultrathin quantum dot film, ensures uniform thickness and optical performance of products, is simple to operate, and can realize stable batch production of the ultrathin quantum dot film without complex operation.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a preparation method and processing equipment of an ultrathin quantum dot film.
Background
Quantum Dots (QDs) are semiconductor nanoparticles with a size of 1-10nm, and can confine conductive particles, holes, and excitons in three directions due to their small physical structure, thereby having a Quantum effect. The quantum dots can be applied to various fields such as luminescent devices, solar cells, biological fluorescent labels and the like due to the structure of the quantum dots, and have wide application prospects.
At present, the most extensive and profound application field of quantum dots is in the optical field. The quantum dot film prepared by mixing and curing the quantum dot and the light curing glue to form a film is applied to a Liquid Crystal Display (Liquid Crystal Display), the NTSC color gamut can be improved to 110% or more, and the NTSC color gamut of the current Liquid Crystal Display can only be about 72%; thereby exhibiting excellent color expression and fidelity. The organic light emitting diode OLED is inferior to quantum dots in color gamut level and extremely high in production cost. Therefore, the application of the quantum dots in the display field undoubtedly has wider prospects and growth power.
At present, the quantum dot film is most widely and mature in application on televisions. Major dimension between 50 and 85 inches; the thickness is usually around 300 μm. The application of the display screen in the size below a Television (TV) (mainly in 10-32 inches) (such as Monitor display, Panel, notewood, vehicle-mounted display field and the like) is relatively limited, and the market popularization rate is very low. A large part of this is due to the fact that quantum dot films applied on these small and medium sizes require thinner thicknesses (< 200 μm or < 150 μm); the ultra-thin product is difficult to be produced in a large scale and industrialized according to the traditional production preparation mode in the process. The traditional preparation method is to coat a quantum dot water layer between two layers of simple barrier films (a single layer is usually 100-125 μm thick) by a roll-to-roll process and obtain the finished quantum dot film by UV curing.
The traditional production and preparation method of the quantum dot film has some defects, including that if the single barrier film is too thin, wrinkles can occur in the traction process and the curing process, the thickness fluctuation of a finished product is large, the optical performance uniformity is poor, and the product is easy to warp due to the heat of UV energy in the process of thin curing of the single barrier film.
Disclosure of Invention
The invention aims to provide a preparation method and processing equipment of an ultrathin quantum dot film, which solve the problems of wrinkling and warping caused by over-thinness of a product in the traction and curing processes of the ultrathin quantum dot film processed in the prior art and ensure the uniformity of the thickness and the optical performance of the product.
In order to achieve the above purpose, the invention provides the following technical scheme: a preparation method of an ultrathin quantum dot film comprises the following steps,
1) selecting quantum dots according to the performance requirements of the ultrathin quantum dot film to be prepared, and dissolving the quantum dots in a quantum dot stabilizer to obtain a quantum dot solution; uniformly mixing the quantum dot solution with matrix resin, scattering particles, a photoinitiator and a diluent to obtain a quantum dot glue solution;
2) the quantum dot glue solution is coated between the first barrier film and the second barrier film by adopting a roll-to-roll process, the first barrier film is adhered to the second barrier film through the quantum dot glue solution, and the first quantum dot film is obtained after the roll-to-roll process is coated; protective films are respectively attached to the sides, far away from each other, of the first barrier film and the second barrier film in the first quantum dot film;
3) the quantum dot liquid dispensing layer positioned between the first barrier film and the second barrier film in the first quantum dot film is cured and formed to obtain a second quantum dot film;
4) the second quantum dot film is cooled through traction, the first barrier film is stripped from the protective film on the side surface of the first barrier film along the first direction, the second barrier film is stripped from the protective film on the side surface of the second barrier film along the second direction in the traction process, and a third quantum dot film is obtained after the protective film is stripped; the first direction is a direction away from the second barrier film and forming a first included angle with the traction direction of the second quantum dot film, the second direction is a direction away from the first barrier film and forming a second included angle with the traction direction of the second quantum dot film, and the first included angle and the second included angle are both larger than zero.
Further, the quantum dots in the step 1) are one or more of CdSe, CdS, CdZnS, ZnSe, ZnS, GaAs, GaN, GaP, InP, InAs, InN, InSb, and AlP, and the structure of the quantum dots is a core-shell structure made of semiconductor materials; the quantum dot stabilizer is one or more of n-hexane, chloroform and isobornyl acrylate; the matrix resin in the quantum dot glue solution is one or more of organic silicon resin, epoxy resin, polyurethane and acrylic resin; the scattering particles are inorganic particles and/or organic particles, the inorganic particles are one or more of nano silicon dioxide, nano titanium dioxide, nano calcium dioxide and nano zirconium dioxide, and the organic particles are one or more of organic silicon nanoparticles and acrylic nanoparticles; the photoinitiator is one or more of phenyl ketone and derivatives thereof, and phenyl phosphorus oxide and derivatives thereof; the diluent is one or more of acetic acid, ethyl acetate, butyl acetate and acrylic acid monomers.
Further, the thickness of the first barrier film or the second barrier film in the step 2) of the first quantum dot film is 20 μm to 50 μm; the protective film on the side face, far away from each other, of the first barrier film and the second barrier film is a release protective film, and the thickness of the release protective film is 50-100 micrometers.
Further, the thickness of the quantum glue dispensing liquid layer in the step 3) is 20-100 μm.
The invention also discloses processing equipment of the ultrathin quantum dot film, which comprises an unreeling shaft group, a reel-to-reel coating and feeding device, a first traction device, a curing device, a tearing roller group, a second traction device and a reeling shaft;
the unwinding shaft group comprises a first unwinding shaft and a second unwinding shaft, the first unwinding shaft is used for discharging a first barrier film with a protective film on one side surface, and the second unwinding shaft is used for discharging a second barrier film with a protective film on one side surface;
defining the traction direction of the film surface of the first barrier film discharged from the first unwinding shaft as the horizontal direction, and the thickness direction of the first barrier film as the vertical direction, so that the second barrier film discharged from the second unwinding shaft is correspondingly parallel to and spaced from the first barrier film along the horizontal direction, and the protective films are respectively arranged on the side surfaces, far away from each other, of the first barrier film and the second barrier film;
the roll-to-roll coating feeding device comprises an upper metering roll, a coating roll and a lower metering roll which are axially parallel and sequentially arranged at intervals along the vertical direction, the first barrier film is connected to a first traction device along the installation gap of the upper metering roll and the coating roll, and the second barrier film is connected to the first traction device along the installation gap of the coating roll and the lower metering roll; the coating rollers are used for coating quantum dot glue solutions on the side surfaces, far away from the upper metering roller, of the first barrier films and the side surfaces, far away from the lower metering roller, of the second barrier films respectively;
the first traction device is connected to the second traction device and used for correspondingly attaching the side surface of the first barrier film coated with the quantum dot glue solution to the side surface of the second barrier film to obtain a first quantum dot film with the middle part being a quantum dot glue solution layer;
the curing device is a UV curing oven, is arranged between the first traction device and the second traction device, and is used for curing and forming the quantum dot liquid dispensing layer in the first quantum dot film to obtain a second quantum dot film;
the tearing roller group comprises a first tearing roller and a second tearing roller, and the first tearing roller and the second tearing roller are symmetrically arranged on two sides of the second quantum dot film along the thickness direction of the second quantum dot film; the first tearing roller is connected with the protective film on the side surface of the first barrier film and used for driving the protective film on the side surface of the first barrier film to peel off the first barrier film and rolling the protective film on the side surface of the first barrier film along the first direction; the second tearing roller is connected with the protective film on the side face of the second barrier film and used for driving the protective film on the side face of the second barrier film to peel off the second barrier film and rolling the protective film on the side face of the second barrier film along the second direction; the first direction is a direction which is far away from the second barrier film and forms a first included angle with the traction direction of the second quantum dot film, the second direction is a direction which is far away from the first barrier film and forms a second included angle with the traction direction of the second quantum dot film, and the first included angle and the second included angle are both larger than zero;
the winding shaft is arranged on the side, far away from the first traction device, of the second traction device and used for winding a third quantum dot film, and the third quantum dot film is a second quantum dot film formed after the protective film is peeled off by the tearing roller group.
Further, the device also comprises a first storage rack and a second storage rack; the first storage rack is positioned between the unwinding shaft group and the roll-to-roll coating feeding device and used for storing a first barrier film discharged by the first unwinding shaft and a second barrier film discharged by the second unwinding shaft; and the second storage rack is positioned between the second traction device and the winding shaft and used for storing the third quantum dot film which is dragged by the second traction device.
Further, the first included angle and the second included angle are both 90 °.
Furthermore, the rolling direction of the first tearing roller and the rolling direction of the second tearing roller are opposite to the traction direction of the second quantum dot film.
According to the technical scheme, the preparation method and the processing equipment of the ultrathin quantum dot film provided by the technical scheme of the invention have the following beneficial effects:
the invention discloses a preparation method and processing equipment of an ultrathin quantum dot film, which are used for improving the thickness of the ultrathin quantum dot film at the initial processing stage through the stage of initial unreeling in the production preparation process until a quantum dot dispensing liquid coating layer is formed between two barrier films through UV illumination and heating curing, wherein the relatively far side surfaces of the two barrier films are always attached with a release protective film, so that the problems that the quantum dot film is wrinkled in the traction and curing process, the thickness fluctuation of a finished product is large, the optical performance uniformity is poor and the product is warped due to UV illumination and energy radiation in heating during curing are solved. And in a further ultra-thin quantum dot film obtaining stage, gradually stripping the release type protective film by adopting a tearing roller set to separate the opposite side surfaces of the two barrier films with the quantum dot liquid dispensing layers, and finally obtaining the ultra-thin quantum dot film consisting of the quantum dot liquid dispensing layers and the two barrier films positioned on the outer sides of the quantum dot liquid dispensing layers. The technical scheme of the invention is simple to operate, and stable batch production of the ultrathin quantum dot film can be realized without complex operation.
In addition, when the processing equipment is used, when the tearing roll group is used for stripping and rolling the protective film, the rolling directions of the tearing rolls are opposite to the traction direction of the quantum dot film, and the selection of the directions is favorable for stripping the side face of the barrier film from the protective film, and on the other hand, the damage to the surface of the barrier film during stripping of the protective film is reduced, and the influence on the optical performance of the ultrathin quantum dot film is reduced.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a cross-sectional view of a second quantum dot film of the present invention;
FIG. 2 is a diagram of an apparatus for processing an ultra-thin quantum dot film according to the present invention;
fig. 3 is a flow chart of a method for preparing the ultrathin quantum dot film of the invention.
In the figure, the specific meaning of each mark is:
101-protective film, 102-first barrier film, 103-second barrier film, 104-quantum dot liquid dispensing layer, 105-quantum dot, 106-scattering particle, 107-matrix resin, 20-unreeling shaft group, 201-first unreeling shaft, 202-second unreeling shaft, 21-reel-to-reel coating feeding device, 211-upper metering roller, 212-coating roller, 213-lower metering roller, 214-liquid storage stirring kettle, 22-first traction device, 23-curing device, 24-tearing roller group, 241-first tearing roller, 242-second tearing roller, 25-second traction device, 26-reeling shaft, 27-first storage rack and 28-second storage rack.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the singular forms "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or the like, mean that the elements or items listed before "comprises" or "comprising" encompass the features, integers, steps, operations, elements, and/or components listed after "comprising" or "comprising," and do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly.
Based on the prior art, the ultrathin quantum dot film directly prepared from the unreeling stage has the technical problems that the quantum dot film is wrinkled in the traction and curing process due to the fact that a single barrier film is too thin, and the quantum dot film is warped under the radiation of UV illumination and heating in the curing process, so that the thickness fluctuation of a final product is large, and the uniformity of optical performance is poor; the invention aims to provide a preparation method and processing equipment of an ultrathin quantum dot film, which are used for preparing the ultrathin quantum dot film by processing a thick quantum dot film and then peeling off the thick quantum dot film, effectively solving the technical problems, and being simple to operate and capable of realizing stable batch production of the ultrathin quantum dot film.
The following describes the preparation method and processing equipment of the ultra-thin quantum dot film in detail with reference to the embodiments shown in the drawings.
A preparation method of an ultrathin quantum dot film comprises the following steps: 1) selecting quantum dots 105 according to the performance requirements of the ultrathin quantum dot film to be prepared, and dissolving the quantum dots 105 in a quantum dot stabilizer to obtain a quantum dot solution; uniformly mixing the quantum dot solution with matrix resin 107, scattering particles 106, a photoinitiator and a diluent to obtain a quantum dot glue solution; 2) the quantum dot glue solution is coated between the first barrier film 102 and the second barrier film 103 by adopting a roll-to-roll process, the first barrier film 102 is adhered to the second barrier film 103 through the quantum dot glue solution layer, and a first quantum dot film is obtained after the roll-to-roll process is coated; the side surfaces, far away from each other, of the first barrier film 102 and the second barrier film 103 in the first quantum dot film are respectively attached with a protective film 101; 3) curing and molding the quantum dot liquid dispensing layer positioned between the first barrier film 102 and the second barrier film 103 in the first quantum dot film to obtain a second quantum dot film; 4) the second quantum dot film is cooled through drawing, the protective film 101 on the side surface of the first barrier film 102 is stripped from the first barrier film 102 along the first direction in the drawing process, the protective film 101 on the side surface of the second barrier film 103 is stripped from the second barrier film 103 along the second direction, and a third quantum dot film is obtained after the protective film 101 is stripped; the first direction is a direction away from the second barrier film 103 and forming a first included angle with the traction direction of the second quantum dot film, the second direction is a direction away from the first barrier film 102 and forming a second included angle with the traction direction of the second quantum dot film, and the first included angle and the second included angle are both greater than zero.
The quantum dots 105 for preparing the quantum dot solution are one or more of CdSe, CdS, CdZnS, ZnSe, ZnS, GaAs, GaN, GaP, InP, InAs, InN, InSb and AlP, and the quantum dots 105 are in a core-shell structure formed by semiconductor materials; since the quantum dots 105 have different sizes, generally 2-10nm, the emission wavelength of the quantum dots 105 varies with the particle size and composition, and generally includes green quantum dots and red quantum dots, the green quantum dots have smaller particle sizes, and the red quantum dots have larger particle sizes. The quantum dot stabilizer is one or more of n-hexane, chloroform and isobornyl acrylate. The matrix resin 107 for preparing the quantum dot glue solution is one or more of organic silicon resin, epoxy resin, polyurethane and acrylic resin, the scattering particles 106 are inorganic particles and/or organic particles, the inorganic particles are one or more of nano silicon dioxide, nano titanium dioxide, nano calcium dioxide and nano zirconium dioxide, and the organic particles are one or more of organic silicon nano particles and acrylic nano particles; the photoinitiator is one or more of phenyl ketone and derivatives thereof, and phenyl phosphorus oxide and derivatives thereof; the diluent is one or more of acetic acid, ethyl acetate, butyl acetate and acrylic acid monomers. In the embodiment, the matrix resin 107 and the quantum dots 105 form a glue system to encapsulate the quantum dots, so that the quantum dots 105 can be encapsulated and protected at one time, and quenching of the quantum dots 104 is reduced.
As shown in fig. 1, the second quantum dot film is a multilayer structure, and includes a quantum dot liquid dispensing layer 104 located between the first barrier film 102 and the second barrier film 103, and a protective film 101 attached to a side surface of the first barrier film 102, which is far away from the second barrier film 103; the third quantum dot film is formed by only the first barrier film 102, the second barrier film 103 and the quantum dot liquid dispensing layer 104 located between the first barrier film 102 and the second barrier film 103 after the protective film 101 is peeled off, and is a final product, i.e., an ultrathin quantum dot film. In specific implementation, in order to ensure the performance of the ultrathin quantum dot film as a final product, the thickness of the first barrier film 102 or the second barrier film 103 in the first quantum dot film is 20 μm to 50 μm, the thickness of the protective film 101 on the side where the first barrier film 102 and the second barrier film 103 are far away from each other is 50 μm to 100 μm, and the thickness of the quantum dot liquid dispensing layer after curing is 20 μm to 100 μm. In the initial stage of the preparation method, the protective film 101 with a certain thickness is arranged on the side face, relatively far away from the first barrier film 102 and the second barrier film 103, so that the thickness of the formed first quantum dot film and the second quantum dot film can be ensured, and the technical problems that the quantum dot film is wrinkled in the drawing and curing process due to the thin film when the ultrathin quantum dot film is directly prepared, the thickness fluctuation of a finished product is large, the optical performance uniformity is poor, and the ultrathin quantum dot film is warped due to the UV irradiation and the energy irradiation during heating during curing are solved. Have first quantum dot membrane and second quantum dot membrane that has certain thickness relatively ultra-thin quantum dot membrane, in the product forming process, under the effect of traction force and heat radiation, be difficult to take place deformation fold and warpage.
In specific implementation, the first barrier film 102 and the second barrier film 103 are water-oxygen barrier films, and the water-oxygen barrier films can further protect a quantum dot glue system of the quantum dot glue solution layer 104, reduce quenching of quantum dots, and improve performance of the quantum dot glue solution layer 104. In addition, in the embodiment, the protective films 101 on the side surfaces of the first barrier film 102 and the second barrier film 103 are release protective films, and the adhesion between the release protective films and the barrier films is weak, so that the influence on the surface performance of the barrier films is small when the surfaces of the barrier films are peeled off. The barrier film and the protective film can be made of one or more of Polyethylene (PE), polypropylene (PP), Polycarbonate (PC), polyethylene glycol Phthalate (PET) and polymethyl methacrylate (PMMA).
Referring to fig. 2, the processing apparatus for an ultrathin quantum dot film disclosed by the present invention includes an unwinding shaft group 20, a roll-to-roll coating and feeding device 21, a first traction device 22, a curing device 23, a tearing roller group 24, a second traction device 25, and a winding shaft 26.
The unwinding shaft group 20 comprises a first unwinding shaft 201 and a second unwinding shaft 202, wherein the first unwinding shaft 201 is used for unwinding a first barrier film 102 with a protective film 101 on one side, and the second unwinding shaft 202 is used for unwinding a second barrier film 103 with a protective film 101 on one side; defining the drawing direction of the film surface of the first barrier film 102 discharged from the first discharging reel 201 as the horizontal direction and the thickness direction of the first barrier film 102 as the up-down direction, the second barrier film 103 discharged from the second discharging reel 202 is correspondingly parallel to and spaced apart from the first barrier film 102 along the horizontal direction, and the protective films 101 are respectively disposed on the side surfaces of the first barrier film 102 and the second barrier film 103 which are away from each other.
The roll-to-roll coating and feeding device 21 comprises an upper metering roll 211, a coating roll 212 and a lower metering roll 213 which are axially parallel and sequentially arranged at intervals along the vertical direction, when in use, the first barrier film 102 is connected to the first traction device 22 along the installation gap of the upper metering roll 211 and the coating roll 212, and the second barrier film 103 is connected to the first traction device 22 along the installation gap of the coating roll 212 and the lower metering roll 213; the coating roll 212 is used for coating the quantum dot glue solution on the side surface of the first barrier film 102 far away from the upper metering roll 211 and the side surface of the second barrier film 103 far away from the lower metering roll 213. In specific implementation, the thickness of the quantum dot glue solution coated on the barrier film can be adjusted by adjusting the installation gap among the upper metering roll 211, the coating roll 212 and the lower metering roll 213. In the embodiment, in order to ensure that the quantum dot glue solution can be continuously supplied to the coating roller 212 for coating, the roll-to-roll coating and feeding device 21 is further provided with a liquid storage stirring kettle 214, and the fluid in the liquid storage stirring kettle 214 continuously flows to the coating roller 212.
The first barrier film 102 and the second barrier film 103 are coated with the quantum dot glue solution and then are conveyed to the first traction device 22, and then conveyed to the second traction device 25 through the first traction device 22, the traction device usually adopts a traction roller set structure or a traction machine structure formed by two traction rollers which are arranged in parallel and correspondingly, and the quantum dot film is conveyed to the second traction device 25 through the first traction device 22 and is mainly used for conveying and cooling the quantum dot film. The first traction device 22 is used for correspondingly attaching the side surfaces of the first barrier film 102 and the second barrier film 103 respectively coated with the quantum dot glue solution to obtain a first quantum dot film with a quantum dot glue solution layer 104 in the middle.
The curing device 23 is a UV curing oven, is arranged between the first traction device 22 and the second traction device 25, and is used for curing and molding the quantum dot liquid dispensing layer 104 in the first quantum dot film to obtain a second quantum dot film. In an embodiment, the UV curing oven is set to be a box structure with two open ends along the traction direction of the first quantum dot film, a UV lamp and a heating unit are arranged inside the box structure, the first quantum dot film penetrates through the UV curing oven, and the quantum dot glue solution is cured under the UV illumination and heating conditions to form the quantum dot glue solution layer 104. Generally, in order to ensure that the quantum dot liquid dispensing layer 104 can be fully cured, the unreeling speed of the unreeling shaft assembly 20 can be adjusted to achieve the effect of enhancing the drying and curing of the quantum dot liquid dispensing layer 104. And curing the quantum dot liquid dispensing layer 104 in the first quantum dot film by using a UV curing oven to obtain a second quantum dot film.
In the process from the processing equipment to the first quantum dot film, the first quantum dot film is always kept to be a multilayer structure with a certain thickness in the initial stage and the middle stage of the ultrathin quantum dot film preparation, and the multilayer structure can ensure that the quantum dot film cannot be wrinkled and warped in the drawing and curing processes.
The tearing roll group 24 is a subsequent device of the curing device 23, and comprises a first tearing roll 241 and a second tearing roll 242, wherein the first tearing roll 241 and the second tearing roll 242 are symmetrically arranged on two sides of the second quantum dot film along the thickness direction of the second quantum dot film; the first tearing roller 241 is connected to the protective film 101 on the side of the first barrier film 102, and is used for peeling the protective film 101 on the first barrier film 102 from the side of the first barrier film 102 and rolling the protective film 101 along the first direction; the second tearing roller 242 is attached to the protective film 101 on the side of the second barrier film 103, and is used for peeling the protective film 101 thereon from the side of the second barrier film 103 and rolling up the protective film 101 in the second direction. The first direction is a direction away from the second barrier film 103 and forming a first included angle with the traction direction of the second quantum dot film, the second direction is a direction away from the first barrier film 102 and forming a second included angle with the traction direction of the second quantum dot film, and the first included angle and the second included angle are both greater than zero. In a specific embodiment, the winding direction of the first tearing roller 241 and the winding direction of the second tearing roller 242 are opposite to the pulling direction of the second quantum dot film, and when the first tearing roller 241 and the second tearing roller 242 are wound, the first included angle and the second included angle formed by the pulling directions of the protective film 101 and the second quantum dot film are 90 °, on one hand, the selection of the specific angle is favorable for the protective film 101 to peel off the side face of the barrier film, on the other hand, the damage to the surface of the barrier film when the protective film 101 is peeled off is reduced, and the influence on the optical performance of the ultrathin quantum dot film is reduced.
The winding shaft 26 is arranged on the side, far away from the first traction device 22, of the second traction device 25, the winding shaft 26 is parallel to the traction roller of the second traction device 25 and used for winding a third quantum dot film, and the third quantum dot film is the second quantum dot film after the second quantum dot film is subjected to film removal by the tearing roller group 24 and the protection film 101, and is also used for winding a final product ultrathin quantum dot film.
Further referring to the schematic view of the processing apparatus shown in fig. 2, the processing apparatus further includes a first storage rack 27 and a second storage rack 28; the first storage rack 27 is located between the unwinding shaft group 10 and the roll-to-roll coating and feeding device 21, and is used for storing the first barrier film 102 discharged by the first unwinding shaft 201 and the second barrier film 103 discharged by the second unwinding shaft 202; the second storage shelf 28 is located between the second traction device 25 and the take-up shaft 26, and is used for storing the third quantum dot film drawn by the second traction device 25. When the storage rack is specifically implemented, the storage rack comprises a plurality of guide rollers which are correspondingly arranged in parallel and in a staggered mode, and the first barrier film 102, the second barrier film 103 or the third quantum dot film are sequentially stacked and guided in a staggered mode through the guide rollers, so that the storage of the films is realized. In addition, when the processing equipment is applied to practice, because the production line of the ultrathin quantum dot film is longer, a plurality of guide roller sets are usually further added in the equipment, and the film is always kept to be tightly and stably conveyed between two conveying structures.
Example 1
(1) Preparation of quantum dot glue solution
Dissolving green CdSe quantum dots with average particle diameter of 3nm and 7nm in n-hexane at 1.5 wt%, and matrix resin acrylic resin and scattering particle TiO2Photoinitiator 819 and diluent acetic acid; stirring at a rotating speed of 50-300 rpm for 1-3 hours by removing oxygen in vacuum and charging nitrogen for protection to obtain quantum dot glue solution;
(2) preparation of ultrathin quantum dot film
Respectively unwinding a first barrier film 102 and a second barrier film 103 with a protective film 101 attached to one side surface by a first unwinding shaft 201 and a second unwinding shaft 202, wherein the thickness of the protective film is 75 μm, and the thickness of the first barrier film and the second barrier film is 25 μm; under the traction of a traction machine, the prepared quantum dot glue solution and the prepared quantum dot glue solution are respectively coated on the side surfaces, without the protective film 101, of the first barrier film 102 and the second barrier film 103 under the pressing action of an upper metering roller 211, a lower metering roller 213 and a coating roller 212 in a coating head area of a roll-to-roll coating and feeding device 21, and the installation gaps of the upper metering roller 211, the lower metering roller 213 and the coating roller 212 are controlled to enable the thickness of the quantum dot glue solution layer on any one barrier film to be 30-70 mu m; then, the second quantum dot film is cured by a curing device 23 under the conditions of UV illumination and heating with the main peak wavelength of 370nm to obtain a second quantum dot film; after cooling and traction, the tearing roller group 24 tears the protective film 101, and the third quantum dot film is obtained through traction and rolling, namely the finished ultrathin quantum dot film, wherein the thickness of the ultrathin quantum dot film is 100-200 mu m.
For the production in a factory, a user can select the thickness of the protective film 101 attached to the first barrier film 102 and the second barrier film 103, the composition of the quantum dot glue solution, and the installation gap between the upper metering roll 211, the coating roll 212, and the lower metering roll 213 in the roll-to-roll coating and feeding device 21 according to the optical performance requirement of the ultrathin quantum dot film to be processed in actual need, so as to obtain the ultrathin quantum dot films of the quantum dot glue solution layers 104 with different thicknesses.
With reference to fig. 3, the method and the device for manufacturing an ultrathin quantum dot film provided by the invention produce the ultrathin quantum dot film by first producing the thicker quantum dot film and then peeling off the thicker quantum dot film, so that the problems of wrinkling and warping of the quantum dot film in the traction curing process caused by the fact that the film layer is too thin in the prior art for directly manufacturing the ultrathin quantum dot film are efficiently solved, and the uniformity of the thickness and the optical performance of the product is ensured; the method is simple to operate, and stable batch production of the ultrathin quantum dot film can be realized without complex operation.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. A preparation method of an ultrathin quantum dot film is characterized by comprising the following steps,
1) selecting quantum dots according to the performance requirements of the ultrathin quantum dot film to be prepared, and dissolving the quantum dots in a quantum dot stabilizer to obtain a quantum dot solution; uniformly mixing the quantum dot solution with matrix resin, scattering particles, a photoinitiator and a diluent to obtain a quantum dot glue solution;
2) coating the quantum dot glue solution between the first barrier film and the second barrier film by adopting a roll-to-roll process, adhering the first barrier film to the second barrier film through the quantum dot glue solution layer, and obtaining a first quantum dot film after the roll-to-roll process is coated; protective films are respectively attached to the sides, far away from each other, of the first barrier film and the second barrier film in the first quantum dot film;
3) the quantum dot liquid dispensing layer positioned between the first barrier film and the second barrier film in the first quantum dot film is cured and formed to obtain a second quantum dot film;
4) the second quantum dot film is cooled through traction, the first barrier film is stripped from the protective film on the side surface of the first barrier film along the first direction, the second barrier film is stripped from the protective film on the side surface of the second barrier film along the second direction in the traction process, and a third quantum dot film is obtained after the protective film is stripped; the first direction is a direction away from the second barrier film and forming a first included angle with the traction direction of the second quantum dot film, the second direction is a direction away from the first barrier film and forming a second included angle with the traction direction of the second quantum dot film, and the first included angle and the second included angle are both larger than zero.
2. The method for preparing an ultrathin quantum dot film as claimed in claim 1, wherein the quantum dot in step 1) is one or more of CdSe, CdS, CdZnS, ZnSe, ZnS, GaAs, GaN, GaP, InP, InAs, InN, InSb, and AlP, and the structure of the quantum dot is a core-shell structure made of a semiconductor material;
the quantum dot stabilizer is one or more of n-hexane, chloroform and isobornyl acrylate;
the matrix resin in the quantum dot glue solution is one or more of organic silicon resin, epoxy resin, polyurethane and acrylic resin;
the scattering particles are inorganic particles and/or organic particles, the inorganic particles are one or more of nano silicon dioxide, nano titanium dioxide, nano calcium dioxide and nano zirconium dioxide, and the organic particles are one or more of organic silicon nanoparticles and acrylic nanoparticles;
the photoinitiator is one or more of phenyl ketone and derivatives thereof, and phenyl phosphorus oxide and derivatives thereof;
the diluent is one or more of acetic acid, ethyl acetate, butyl acetate and acrylic acid monomers.
3. The method for preparing an ultra-thin quantum dot film according to claim 1, wherein the thickness of the first barrier film or the second barrier film in the step 2) first quantum dot film is 20 μm to 50 μm.
4. The method of manufacturing an ultra-thin quantum dot film according to claim 3, wherein the thickness of the protective film on the side where the first barrier film and the second barrier film are away from each other is 50 μm to 100 μm.
5. The method for preparing an ultrathin quantum dot film as claimed in claim 1, wherein the thickness of the quantum dot liquid dispensing layer in the step 3) is 20 μm to 100 μm.
6. The method of manufacturing an ultra-thin quantum dot film according to claim 4, wherein the protective film is a release protective film.
7. The processing equipment of the ultrathin quantum dot film is characterized by comprising an unwinding shaft group, a roll-to-roll coating and feeding device, a first traction device, a curing device, a tearing roller group, a second traction device and a winding shaft;
the unwinding shaft group comprises a first unwinding shaft and a second unwinding shaft, the first unwinding shaft is used for discharging a first barrier film with a protective film on one side surface, and the second unwinding shaft is used for discharging a second barrier film with a protective film on one side surface;
defining the traction direction of the film surface of a first barrier film discharged from a first unwinding shaft as a horizontal direction, and the thickness direction of the first barrier film as an up-and-down direction, so that a second barrier film discharged from a second unwinding shaft is correspondingly parallel to and spaced from the first barrier film along the horizontal direction, and the protective film is positioned on the side surface, away from each other, of the first barrier film and the second barrier film;
the roll-to-roll coating feeding device comprises an upper metering roll, a coating roll and a lower metering roll which are axially parallel and sequentially arranged at intervals along the vertical direction, the first barrier film is connected to a first traction device along the installation gap of the upper metering roll and the coating roll, and the second barrier film is connected to the first traction device along the installation gap of the coating roll and the lower metering roll; the coating rollers are used for coating quantum dot glue solutions on the side surfaces, far away from the upper metering roller, of the first barrier films and the side surfaces, far away from the lower metering roller, of the second barrier films respectively;
the first traction device is connected to the second traction device and used for correspondingly attaching the side surfaces of the first barrier film and the second barrier film which are respectively coated with the quantum dot glue solution to obtain a first quantum dot film with the middle part being a quantum dot glue solution layer;
the curing device is a UV curing oven, is arranged between the first traction device and the second traction device, and is used for curing and forming the quantum dot liquid dispensing layer in the first quantum dot film to obtain a second quantum dot film;
the tearing roller group comprises a first tearing roller and a second tearing roller, and the first tearing roller and the second tearing roller are symmetrically arranged on two sides of the second quantum dot film along the thickness direction of the second quantum dot film; the first tearing roller is connected with the protective film on the side surface of the first barrier film and used for peeling the protective film on the first barrier film from the side surface of the first barrier film and rolling the protective film along a first direction; the second tearing roller is connected with the protective film on the side surface of the second barrier film and used for peeling the protective film on the second barrier film from the side surface of the second barrier film and rolling the protective film along the second direction; the first direction is a direction which is far away from the second barrier film and forms a first included angle with the traction direction of the second quantum dot film, the second direction is a direction which is far away from the first barrier film and forms a second included angle with the traction direction of the second quantum dot film, and the first included angle and the second included angle are both larger than zero;
the winding shaft is arranged on the side, far away from the first traction device, of the second traction device and used for winding a third quantum dot film, and the third quantum dot film is a second quantum dot film formed after the protective film is peeled off by the tearing roller group.
8. The apparatus for processing the ultra-thin quantum dot film of claim 7, further comprising a first storage rack and a second storage rack; the first storage rack is positioned between the unwinding shaft group and the roll-to-roll coating feeding device and used for storing a first barrier film discharged by the first unwinding shaft and a second barrier film discharged by the second unwinding shaft; and the second storage rack is positioned between the second traction device and the winding shaft and used for storing the third quantum dot film which is dragged by the second traction device.
9. The apparatus of claim 7, wherein the first and second angles are both 90 °.
10. The processing equipment of the ultrathin quantum dot film as claimed in claim 7, wherein the rolling direction of the first tearing roller and the rolling direction of the second tearing roller are opposite to the traction direction of the second quantum dot film.
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