CN114410157B - Alignment coating liquid and application thereof - Google Patents
Alignment coating liquid and application thereof Download PDFInfo
- Publication number
- CN114410157B CN114410157B CN202210165643.6A CN202210165643A CN114410157B CN 114410157 B CN114410157 B CN 114410157B CN 202210165643 A CN202210165643 A CN 202210165643A CN 114410157 B CN114410157 B CN 114410157B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- alignment
- coating liquid
- film
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- 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
-
- 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
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
-
- 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
- C09D7/20—Diluents or solvents
-
- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Abstract
The utility model discloses an alignment coating liquid and application thereof, wherein the alignment coating liquid comprises the following raw material components in percentage by mass: liquid crystal guiding agent: 8-15%; solvent: 60-85%; and (2) a surfactant: 3-8%. The alignment coating liquid is prepared from a liquid crystal guiding agent as a main component and can be used for aligning a liquid crystal layer formed by the liquid crystal coating liquid, so that the alignment coating liquid can be used for preparing a liquid crystal film, the aligned alignment layer is prepared by the alignment coating liquid during preparation, then the liquid crystal coating liquid is coated, the liquid crystal layer with a multi-layer liquid crystal lattice structure can be obtained, bragg reflection occurs, and the liquid crystal film with a multicolor effect is obtained.
Description
Technical Field
The utility model belongs to the technical field of high polymer materials, and particularly relates to an alignment coating liquid and application thereof.
Background
With the popularization of electronic products in the life of the public, people have started to pursue the appearance design of the products, and the appearance characteristics of the products are required to meet the aesthetic concept of most consumers to the greatest extent, no matter the products are electronic products such as mobile phones, flat plates and notebook computers. At present, in order to attract eyeballs of consumers, a plurality of different designs are also formed on the appearance of the electronic product, and a rear cover of the mobile phone is taken as an example, so that various effects such as a fog face, a bright face, a color effect and the like are formed, and the appearance effect of the mobile phone can be improved, wherein the bright face and the color effect are deeply favored by consumers due to strong visual impact effects.
The material of the mobile phone rear cover is mainly metal material, glass material and engineering plastic. The metal material has a bright surface effect, but has the defects of high coloring difficulty, electromagnetic shielding property and the like when being used as a mobile phone rear cover. Although the glass material has no magnetic field interference, the glass material is fragile under the action of external force, and has poor anti-falling performance and wear resistance. Engineering plastics such as the existing composite board rear cover not only have the advantage of metal and glass material, but also can realize the colorful appearance effect through a coating mode, so that the engineering plastics are deeply loved by young consumers.
In the prior art, the utility model with the bulletin number of CN214381674U discloses a shell consisting of a matrix, a liquid crystal optical film layer and a reflecting layer, wherein the matrix adopts a composite board of PC and PMMA; the liquid crystal optical film layer comprises oriented liquid crystal, on one hand, incident light entering the liquid crystal optical film layer can be reflected by the reflecting layer, so that the brightness and glossiness of the whole shell are improved; on the other hand, the oriented liquid crystal reflects light rays and presents a certain main color, and the wavelength of the reflected light is different along with the change of the incident angle of the incident light, so that when a user observes at different angles, the color presented by the observed liquid crystal optical film layer can be red shifted or blue shifted along with the change of the observation angle, and finally the whole shell has a colorful effect; the reflection layer can improve the brightness and glossiness of the shell, so that the shell can display a high-brightness colorful effect by being matched with the liquid crystal optical film layer. It is known from this patent that a combination of a liquid crystal optical film layer and a reflective layer is disclosed, and that a glare effect is achieved by compounding the reflective layer and the liquid crystal layer. However, the optical film in the patent is formed by combining the liquid crystal optical film layer and the multilayer reflecting layer, so that the thickness of the mobile phone rear cover is greatly increased, the light weight of the mobile phone rear cover is not facilitated, the use experience of consumers is poorer, and in addition, the production cost of the mobile phone rear cover is increased due to the existence of the multilayer reflecting layer, and the preparation period is greatly prolonged.
Disclosure of Invention
The utility model aims to provide an alignment coating liquid which takes a liquid crystal guiding agent as a main component and can induce alignment of a liquid crystal layer formed by the liquid crystal coating liquid, and the utility model also provides an application of the alignment coating liquid in preparing a liquid crystal film.
The utility model is realized by the following technical scheme: an alignment coating liquid comprises the following raw material components in percentage by mass:
liquid crystal guiding agent: 8-15%;
solvent: 60-85%;
and (2) a surfactant: 3-8%.
The liquid crystal guiding agent is water-soluble polyvinyl alcohol and/or derivatives thereof. The derivatives thereof include: polyvinyl formal, polyvinyl acetal, polyvinyl butyral, polyvinyl phthalate, and the like.
The solvent is mainly water, and can also contain other solvents including but not limited to at least one of alcohols, esters, ketones, benzene, ketoamide solvents. For example: alcohols such as methanol and ethanol; toluene, xylene, cumene, mesitylene; ester solvents such as methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and the like; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and cyclopentanone; ether solvents such as tetrahydrofuran, 1, 2-dimethoxyethane, anisole, and the like; amide solvents such as N, N-dimethylformamide and N-methyl-2-pyrrolidone; propylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, gamma-butyrolactone, chlorobenzene, and the like. These may be used alone or in combination of two or more kinds, and one or two or more kinds of alcohol solvents may be preferably used in combination in the present utility model.
The surfactant may improve the coatability of the alignment layer solution and the liquid crystal coating liquid, and in the present utility model, the surfactant includes, but is not limited to, a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a silicone surfactant, a polyalkylene oxide surfactant, or a fluorine-containing surfactant.
The utility model also includes: and (3) applying the alignment coating liquid to the preparation of the liquid crystal film, coating the alignment coating liquid on a support, drying the support to obtain an alignment film, rubbing the support to obtain an alignment layer, and coating the liquid crystal coating liquid on the alignment layer to obtain the liquid crystal film.
The support is a film made of a thermoplastic resin by extrusion molding. One or a mixture of several of polyester resin, polycarbonate resin, polystyrene resin, polyacrylate resin, polymethacrylate resin, polyurethane resin, polyethylene resin and polyvinyl chloride resin, for example, polyethylene terephthalate resin PET, may be used.
The coating method of the alignment coating liquid may be a conventionally known bar coating method, an applicator method, a spin coating method, a roll coating method, a direct gravure coating method, a reverse gravure coating method, a flexo coating method, an inkjet method, a die coating method, a coating method (capcoating), a dip coating method, a slit coating method, or the like. In practice, the support is continuously transported in the transport direction, and then the alignment coating liquid is applied to the support by any one of the above-described coating methods.
The drying equipment can adopt the prior known hot air type heating, near infrared heating, far infrared heating, microwave heating and other modes.
In the utility model, the drying temperature is 80-100 ℃, and the drying time is 3-10 min; the rubbing alignment is to use paper, gauze, felt, rubber, nylon or polyester fiber to rub on the surface of the alignment film along the same direction, so as to obtain the alignment layer after alignment.
The support provided with the alignment layer satisfies the following criteria:
thickness tolerance: 1um;
transmittance: more than or equal to 90 percent;
haze: less than or equal to 2 percent;
the value of dyne: and more than or equal to 34dyne.
The liquid crystal coating liquid is cholesteric liquid crystal, and molecules of each layer of cholesteric liquid crystal are arranged in a multi-layer mode under the action of the alignment layer to form a Bragg reflection structure, so that when the angle of an observer changes, the color can be obviously and continuously changed, and the multicolor effect is generated. The cholesteric liquid crystal comprises 12-38% of achiral polymerizable monomer, 2-5% of chiral polymerizable monomer, 0.03-3% of initiator, 1-3% of auxiliary agent and 60-80% of solvent according to mass percentage.
Further, the achiral polymerizable monomer includes a difunctional polymerizable monomer and a monofunctional polymerizable monomer:
the difunctional polymerizable monomer satisfies the following formula:
（a）
wherein m and n each represent a natural number of 4 to 8, R 1 Represents a hydrogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a phenyl group, a benzyl group, an ester group or the like.
For example: m and n are each 4, R 1 A polymeric monomer that is a hydrogen atom; m and n are each 6, R 1 A polymerized monomer which is methoxy, and the like.
The monofunctional polymerizable monomer satisfies the following formula:
（b）
in the above, R 2 Represents a hydrogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a phenyl group, a benzyl group, an ester group or the like.
For example, R 2 A polymeric monomer that is a hydrogen atom; r is R 2 A polymeric monomer that is methyl; r is R 2 A polymerized monomer which is phenyl, and the like.
The chiral polymerizable monomer can be CN, CB15, S811 and R1011, and chiral agent with the structure shown in the following formula:
（c）
initiators include, but are not limited to, azo species, peroxy species, and redox species. Water-soluble initiators (e.g., inorganic persulfates, hydrogen peroxide, water-soluble azo initiators, etc.) and oil-soluble (monomer-or organic solvent-soluble) organic initiators can also be classified according to their solubility. The polymerizable liquid crystal composition (cholesteric liquid crystal) of the present utility model preferably contains at least one or more polymerization initiators such as a thermal polymerization initiator and a photopolymerization initiator. As the thermal polymerization initiator, benzoyl peroxide, 2' -azobisisobutyronitrile, and the like can be used. Further, as the photopolymerization initiator, benzoin ethers, benzophenones, acetophenones, present benzil ketals, thioxanthones, and the like can be used.
The auxiliary agent can be flame retardant, defoamer and hardening accelerator. The flame retardant is mainly halogen-free flame retardant, and can be phosphorus flame retardant, nitrogen flame retardant, intumescent flame retardant and the like, and further can be tricresyl phosphate, triphenyl phosphate, triisopropylphenyl phosphate, tributyl phosphate, trioctyl phosphate, diphenyl phosphate, melamine and the like. The defoamer is preferably an organosilicon defoamer, which is described in H 2 In the O and common oils, the silicone oil has high activity and low solubility, and the basic characteristics of the silicone oil are stable chemical properties, wide application range, low volatility, no toxicity, relatively outstanding defoaming capability and the like, and can be particularly polydimethylsiloxane, ethylene glycol siloxane, hydroxy silicone oil, fluorosilicone and the like. The hardening accelerator may be selected to ensure the mechanical strength of the formed liquid crystal layer and the stability of the liquid crystal alignment property: among these compounds, compounds having a phenol group, a silanol group, a thiol group, a phosphate group, a sulfonate group, a carboxyl group, a carboxylic anhydride group, and the like are preferable. Specific examples thereof include compounds having a phenol group: cyanophenol, nitrophenol, methoxyphenoxyphenol, thiophenoxyphenol, 4-benzyl phenol, and the like; examples of the compound having a silanol group include: trimethylsilanol (TMS),Triethylsilanol, 1, 4-bis (hydroxydimethylsilyl) benzene, triphenylsilanol, diphenylsilanediol, and the like.
The solvent is one or more selected from toluene, xylene, cumene, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, acetone, butanone, dipentamethyleneone, cyclopentanone, etc.
The liquid crystal film meets the following indexes:
thickness: 8%;
transmittance: more than or equal to 85 percent;
haze: less than or equal to 3 percent;
core wavelength tolerance: 5nm;
reflectivity: more than or equal to 40 percent.
Compared with the prior art, the utility model has the following advantages:
(1) The utility model provides an alignment coating liquid which can be used for preparing a liquid crystal film with a multicolor effect, wherein the alignment coating liquid takes a liquid crystal guiding agent as a main component, is matched with a solvent and a surfactant to form an alignment layer, can induce the alignment of the liquid crystal coating liquid coated on the alignment coating liquid, and ensures that the obtained liquid crystal layer has a more regular multilayer liquid crystal lattice structure, and can realize the bright multicolor effect without adding a reflecting layer or other alignment layers.
(2) According to the utility model, the alignment coating liquid is coated on the support body to form the alignment layer with the orientation after drying and rubbing alignment, then the liquid crystal coating liquid is coated on the alignment layer to form the liquid crystal layer with the multicolor effect, and in actual preparation, the multicolor shell can be obtained by transferring the liquid crystal layer onto the base material in a release mode, the preparation process is simple, the operation is convenient, the alignment coating liquid and the liquid crystal coating liquid can be realized in a continuous winding coating mode, the mass production is easy, and the production efficiency is improved.
(3) The liquid crystal film has a simple structure, can realize the effects of high transmittance and illusion color by a single liquid crystal layer, and greatly shortens the preparation period of the shell and reduces the production cost compared with the colorful shell formed by the existing (multi-layer) reflecting layer and the liquid crystal layer.
(4) The utility model is suitable for the shell of electronic products, in particular portable electronic products such as a mobile phone back cover, a notebook computer, a tablet computer and the like, has a light and thin structure, is easy to favor by users, has bright appearance and can meet the pursuit of users on the appearance effect. When the transparent fluorescent powder is prepared, a layer of liquid crystal (cholesteric liquid crystal film) prepared by the alignment coating liquid is directly adhered to a substrate with high reflectivity and high light transmittance, and the effect of the shell body in a bright and colorful state can be achieved.
Drawings
Fig. 1 is a structural diagram of a liquid crystal film.
Fig. 2 is a schematic diagram of different visual illusion effects of the rear cover of the illusion-color mobile phone.
Fig. 3 is a picture of a liquid crystal film.
Fig. 4 is a comparative picture of the back cover of the fantasy cell phone.
Detailed Description
The present utility model will be described in further detail with reference to examples, but embodiments of the present utility model are not limited thereto.
Example 1: alignment coating liquid I
The alignment coating liquid I was prepared according to the following formula: 15% of polyvinyl alcohol, 80% of methanol and water and 5% of fluorine-containing surfactant.
Example 2: alignment coating liquid II
The alignment coating liquid II is prepared according to the following formula: 8% of polyvinyl alcohol, 85% of methanol and water and 7% of anionic surfactant.
Example 3: alignment coating liquid III
An alignment coating solution III was prepared according to the following formulation: 10% of polyvinyl alcohol, 82% of methanol and water and 8% of fluorine-containing surfactant.
Example 4: alignment coating solution IV
The alignment coating solution IV is prepared according to the following formula: 11% of polyvinyl alcohol, 85% of methanol and water and 4% of cationic surfactant.
Example 5: alignment coating liquid V
An alignment coating solution v was prepared according to the following formulation: 12% of polyvinyl alcohol, 80% of methanol and water and 8% of fluorine-containing surfactant.
Example 6: alignment coating liquid VI
An alignment coating solution vi was prepared according to the following formulation: 15% of polyvinyl alcohol, 80% of methanol and water and 5% of fluorine-containing surfactant.
Example 7: liquid crystal film I
The liquid crystal coating liquid I is prepared according to the following formula: monomers satisfying the formula (a) (m and n are 4, R respectively 1 10% of a hydrogen atom), a monomer satisfying the formula (b) (R thereof 2 Methyl) 8%, CN 3%, 2' -azobisisobutyronitrile 0.15%, tricresyl phosphate 1%, polydimethylsiloxane 1%, trimethylsilanol 1% and toluene 76%.
Coating the alignment coating liquid I on PET with the thickness of 100 mu m according to a gravure coating method, feeding the coated PET into hot air drying equipment, heating for 5min at 80-85 ℃, forming an alignment film on the PET film, rubbing the PET film by using gauze to form an alignment layer, wherein the performance index of the PET provided with the alignment layer meets the range shown in Table 1. The liquid crystal coating liquid I is coated on the alignment layer by a gravure coating method, and the coated liquid crystal coating liquid I is sent into a multi-stage oven. In the first drying box, the drying temperature is respectively set to be 70-75 ℃, 80-85 ℃ and 95-100 ℃ along the conveying direction; then cooling the mixture by a cooling box at 20-22 ℃; finally, the mixture enters a second drying box for tempering and drying again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction, and after tempering treatment, the mixture is cured for 15s under the irradiation of 350nm ultraviolet light, wherein the curing capacity is 350mj/cm 2 . The liquid crystal coating is cured by polymerization and cross-linking, and a liquid crystal layer, namely a liquid crystal film I is formed.
Table 1 performance index of PET provided with alignment layer
Example 8: liquid crystal film II
The liquid crystal coating liquid II is prepared according to the following formula: monomers satisfying the formula (a) (m and n are 6, R respectively 1 Methoxy) 15% monomers satisfying formula (b) (R thereof 2 Methyl) 20%, chiral agent 2% satisfying formula (c), benzoin ether initiator 0.05%, tricresyl phosphate 0.05%, hydroxy silicone oil 0.05%, trimethylsilanol 0.05% and toluene 62.8%.
Coating the alignment coating liquid II on PET with the thickness of 80 mu m according to a gravure coating method, feeding the coated PET into hot air drying equipment, heating for 8min at 95-100 ℃, forming an alignment film on the PET film, rubbing the PET film by using gauze to form an alignment layer, wherein the performance index of the PET provided with the alignment layer meets the range shown in Table 1. The alignment layer was coated with the liquid crystal coating liquid II by gravure coating, and the coated liquid crystal coating liquid was fed into a multistage oven. In the first drying box, the drying temperature is respectively set to 75-80 ℃, 80-85 ℃ and 90-95 ℃ along the conveying direction; then cooling the mixture by a cooling box at the temperature of 35-40 ℃; finally, the mixture enters a second drying box for tempering and drying again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction, after tempering treatment, the mixture is cured for 20s under the irradiation of 350nm ultraviolet light, and the curing capacity is 350mj/cm 2 . The liquid crystal coating is cured by polymerization and cross-linking, and a liquid crystal layer, namely a liquid crystal film II is formed.
Example 9: liquid-crystal film III
The liquid crystal coating liquid III was prepared according to the following formula: monomers satisfying formula (a) (m is 4, n is 6, R 1 25% of methyl), a monomer satisfying the formula (b) (R thereof 2 Phenyl) 5%, R1011 5%, benzoyl peroxide 1%, tricresyl phosphate 1%, 1, 4-bis (hydroxydimethylsilyl) benzene 0.5% and ethyl acetate 62.5%.
Coating the alignment coating solution III on PET with the thickness of 120 mu m according to a gravure coating method, feeding the coated PET into hot air drying equipment, heating for 3min at 95-100 ℃, forming an alignment film on the PET film, rubbing the PET film by using gauze to form an alignment layer, wherein the performance index of the PET provided with the alignment layer meets the range shown in Table 1. The alignment layer was coated with the liquid crystal coating liquid iii by gravure coating, and the coated alignment layer was fed into a multistage oven. In the first drying box, the drying temperatures are respectively set along the conveying directionSetting at 70-75 deg.c, 85-90 deg.c and 95-100 deg.c; then cooling the mixture by a cooling box at 30 ℃; finally, the mixture enters a second drying box for tempering and drying again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction, and after tempering treatment, the mixture is cured for 10s under the irradiation of 370nm ultraviolet light, wherein the curing capacity is 350mj/cm 2 . The liquid crystal coating is cured by polymerization and cross-linking, and a liquid crystal layer, namely a liquid crystal film III is formed.
Example 10: liquid crystal film IV
The liquid crystal coating liquid IV is prepared according to the following formula: monomers satisfying the formula (a) (m and n are 5, R respectively 1 6% of phenyl), monomers satisfying the formula (b) (R thereof 2 6% of ethyl), 5% of chiral agent satisfying the formula (c), 1.5% of 2,2' -azobisisobutyronitrile, 0.5% of polydimethylsiloxane, 1% of cyanophenol and 80% of xylene.
Coating the alignment coating liquid IV on PET with the thickness of 150 mu m according to a gravure coating method, feeding the coated PET into hot air drying equipment, heating for 6min at 85-90 ℃, forming an alignment film on the PET film, rubbing the PET film by using gauze to form an alignment layer, wherein the performance index of the PET provided with the alignment layer meets the range shown in Table 1. The liquid crystal coating liquid IV is coated on the alignment layer by a gravure coating method, and the coated liquid crystal coating liquid IV is sent into a multi-stage oven. In the first drying box, the drying temperature is respectively set to be 70-75 ℃, 80-85 ℃ and 90-95 ℃ along the conveying direction; then cooling the mixture by a cooling box at 35 ℃; finally, the mixture enters a second drying box for tempering and drying again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction, and after tempering treatment, the mixture is cured for 10s under the irradiation of 370nm ultraviolet light, wherein the curing capacity is 350mj/cm 2 . The liquid crystal coating is cured through polymerization and crosslinking, and a liquid crystal layer, namely a liquid crystal film IV is formed.
Example 11: liquid crystal film V
The liquid crystal coating liquid V is prepared according to the following formula: monomers satisfying the formula (a) (m and n are 4, R respectively 1 15% of a hydrogen atom), a monomer satisfying the formula (b) (R thereof 2 Methyl) 10% of chiral agent which satisfies the formula (c), 0.05% of diphenyl ketone initiator, 1% of tricresyl phosphate, 0.5% of polydimethylsiloxane, 1.45% of trimethylsilanol and 68% of toluene.
The alignment coating solution V is coated on PET with the thickness of 300 mu m according to a gravure coating method, the coated PET is sent into hot air drying equipment, and heated for 10min at the temperature of 95-100 ℃, an alignment film is formed on the PET film, the PET film is rubbed and aligned by gauze to form an alignment layer, and the performance index of the PET provided with the alignment layer meets the range shown in Table 1. The alignment layer was coated with the liquid crystal coating solution V by gravure coating, and the coated layer was then fed into a multistage oven. In the first drying box, the drying temperature is respectively set to 75-80 ℃, 90 ℃ and 100 ℃ along the conveying direction; then cooling the mixture by a cooling box at 38 ℃; finally, the mixture enters a second drying box for tempering and drying again, the tempering temperature is sequentially set to be 90-95 ℃, 80-85 ℃ and 70-75 ℃ along the conveying direction, and after tempering treatment, the mixture is cured for 10s under the irradiation of 370nm ultraviolet light, wherein the curing capacity is 350mj/cm 2 . The liquid crystal coating is cured by polymerization and cross-linking, and a liquid crystal layer, namely a liquid crystal film V is formed.
Example 12: liquid crystal film VI
The liquid crystal coating liquid VI is prepared according to the following formula: monomers satisfying the formula (a) (m and n are 4, R respectively 1 17% of a hydrogen atom), a monomer satisfying the formula (b) (R thereof 2 Methoxy) 10%, S811 4%, 2' -azobisisobutyronitrile 1%, fluorosilicone 1%, nitrophenol 1% and toluene 66%.
Coating the alignment coating liquid VI on PET with the thickness of 270 mu m according to a gravure coating method, feeding the coated PET into hot air drying equipment, heating for 10min at 95-100 ℃, forming an alignment film on the PET film, rubbing the PET film by using gauze to form an alignment layer, wherein the performance index of the PET provided with the alignment layer meets the range shown in Table 1. The alignment layer was coated with the liquid crystal coating liquid vi by gravure coating, and the coated alignment layer was fed into a multistage oven. In the first drying box, the drying temperature is respectively set to 75-80 ℃, 90 ℃ and 100 ℃ along the conveying direction; then cooling the mixture by a cooling box at 35 ℃; finallyEntering a second drying box, tempering and drying again, wherein the tempering temperature is sequentially set to 90-95 ℃, 80-85 ℃ and 70-75 ℃ along the conveying direction, and after tempering treatment, the material is cured for 15s under the irradiation of 350nm ultraviolet light, and the curing capacity is 350mj/cm 2 . The liquid crystal coating is cured by polymerization and cross-linking, and forms a liquid crystal layer, namely a liquid crystal film VI.
The liquid crystal films of examples 7 to 12 were each subjected to an experiment, and the performance indexes thereof were measured as shown in table 2 below.
TABLE 2 Performance index of liquid Crystal films
Example 13: colorful mobile phone rear cover
And (3) gluing the liquid crystal film I by a gluing roller, wherein the speed of a gluing wheel is 6m/min, a gluing gap is 100 microns, bonding the liquid crystal film with a PC/PMMA composite board (the performance indexes are shown in the following table 3, and of course, PC or PMMA can also be adopted), curing an LED lamp and curing a mercury lamp, wherein the power of the LED lamp is 50%, the temperature of the mercury lamp is 80 ℃, the current of the mercury lamp is 35A, and a support body is removed, so that the multicolor mobile phone rear cover formed by compounding the liquid crystal film and the PC/PMMA is obtained.
Table 3 Performance index of PC/PMMA composite plate
The performance indexes of the multicolor mobile phone rear cover obtained by the experiment are shown in the following table 4.
TABLE 4 performance index of color-changing rear cover
The structure of the liquid crystal film I can be shown by referring to FIG. 1, and as can be seen from FIG. 1, each layer of molecules in the liquid crystal film I are arranged in a multi-layer manner, so that a Bragg reflection structure can be formed, and when the angle of an observer changes, the color can be changed obviously and continuously, thereby generating a fantasy effect. The fantasy effect of the fantasy cell phone back cover prepared by the liquid crystal film I is shown in fig. 2, and as can be seen from fig. 2, under different visual angles, an observer can observe different fantasy effects presented by the cell phone back cover, for example, in fig. 2, the cell phone back cover presents red at 0 degrees, the cell phone back cover presents yellow at 45 degrees, and the cell phone back cover presents green at 70 degrees.
The picture of the liquid crystal film I can refer to the picture shown in fig. 3, and the liquid crystal film I presents different gradual change colors according to the angle of incident light, and has certain light transmittance. The liquid crystal film shown in a is gradually changed from green to yellow to red along the arrow sign direction, and the liquid crystal film shown in b is gradually changed from orange to red along the arrow sign direction. The picture of the multicolor mobile phone rear cover prepared by the liquid crystal film I can refer to the picture shown in fig. 4, and is respectively photographed at different angles for the same multicolor mobile phone rear cover (7 same mobile phone rear covers from left to right), and is A, B, C groups in sequence, as can be seen from fig. 3, the colors of the 7 same mobile phone rear covers photographed at the same angles are different, and meanwhile, when the photographing angles are changed, the corresponding mobile phone rear covers all present gradual change colors.
Comparative example:
this comparative example is a comparative example to that of example 7 and example 13, differing only in that: the alignment coating liquid is not adopted, in the preparation process, the liquid crystal coating liquid is directly coated on PET according to the same technological method and parameter standard of the example 7 and the example 13, a liquid crystal film with a corresponding liquid crystal layer is prepared, and finally, the mobile phone rear cover is prepared in the same mode.
Comparing the mobile phone back cover with the multicolor prepared in the embodiment 13, an experimenter can find that the mobile phone back cover of the comparative example presents certain color change even when the incident light angle is changed, but the color change is single, usually one color is directly jumped to another color, various colors are not presented in the gradual change process, and the multicolor effect of the mobile phone back cover with the multicolor in the embodiment 13 is not provided, so that the mobile phone back cover with the multicolor has no obvious visual impact effect for observers.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.
Claims (4)
1. A method for preparing a liquid crystal film with a multicolor effect is characterized by comprising the following steps: the method comprises the following steps:
(1) The preparation method comprises the following steps of: 11-15% of polyvinyl alcohol, 80-85% of methanol and water, and 4-8% of fluorine-containing surfactant or cationic surfactant;
(2) Coating the alignment coating liquid on a support body, and drying for 3-10 min at 80-100 ℃ to obtain an alignment film;
(3) Rubbing the surface of the alignment film in the same direction by using paper, gauze, felt, rubber, nylon or polyester fiber to obtain an alignment layer after alignment;
(4) Coating liquid crystal coating liquid on the oriented alignment layer, and carrying out multistage drying after coating, wherein the drying temperature is respectively controlled at 75-80 ℃, 80-85 ℃ and 90-95 ℃ along the conveying direction during primary drying; then cooling, and controlling the temperature at 35-40 ℃; finally, carrying out secondary drying, setting the drying temperature to 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction, then carrying out ultraviolet curing reaction to obtain the liquid crystal film,
the liquid crystal coating liquid is cholesteric liquid crystal, and the cholesteric liquid crystal consists of 12-38% of achiral polymerizable monomer, 2-5% of chiral polymerizable monomer, 0.03-3% of initiator, 1-3% of auxiliary agent and 60-80% of solvent according to mass percentage.
2. The method according to claim 1, characterized in that: in the step (2), the support is a film produced by extrusion molding of a thermoplastic resin.
3. The method according to claim 1, characterized in that: the support provided with the alignment layer satisfies the following criteria:
thickness tolerance: 1um;
transmittance: more than or equal to 90 percent;
haze: less than or equal to 2 percent;
the value of dyne: and more than or equal to 34dyne.
4. The method according to claim 1, characterized in that: the liquid crystal film meets the following indexes:
thickness: 8%;
transmittance: more than or equal to 85 percent;
haze: less than or equal to 3 percent;
core wavelength tolerance: 5nm;
reflectivity: more than or equal to 40 percent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210165643.6A CN114410157B (en) | 2022-02-23 | 2022-02-23 | Alignment coating liquid and application thereof |
| TW112103647A TW202344632A (en) | 2022-02-23 | 2023-02-02 | An alignment coating solution and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210165643.6A CN114410157B (en) | 2022-02-23 | 2022-02-23 | Alignment coating liquid and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114410157A CN114410157A (en) | 2022-04-29 |
| CN114410157B true CN114410157B (en) | 2023-09-22 |
Family
ID=81260760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210165643.6A Active CN114410157B (en) | 2022-02-23 | 2022-02-23 | Alignment coating liquid and application thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114410157B (en) |
| TW (1) | TW202344632A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116535569A (en) * | 2023-05-29 | 2023-08-04 | 苏州科技大学 | Pendant-free acrylic ester liquid crystal compound and preparation method thereof |
| CN116813960A (en) * | 2023-05-29 | 2023-09-29 | 苏州科技大学 | High-reflection adjustable liquid crystal film and preparation method thereof |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200641069A (en) * | 2005-02-18 | 2006-12-01 | Dainippon Printing Co Ltd | Ink composition for forming a liquid crystal layer, and optical film, polarizing film and liquid crystal display apparatus using same |
| CN102053424A (en) * | 2009-10-26 | 2011-05-11 | 默克专利股份有限公司 | Alignment layer for planar alignment of a polymerizable liquid crystalline or mesogenic material |
| TW201506469A (en) * | 2013-08-01 | 2015-02-16 | Fujifilm Corp | Production method of polarizing plate |
| CN104777651A (en) * | 2015-04-29 | 2015-07-15 | 厦门大学 | Polymerization method for cholesteric liquid crystal grating pattern |
| TW201602189A (en) * | 2014-06-27 | 2016-01-16 | Fujifilm Corp | Transfer material of luminance-improving film, method of preparing transfer material, luminance-improving film, method of manufacturing optical sheet member using said transfer material, and optical sheet member |
| CN105425327A (en) * | 2015-12-10 | 2016-03-23 | 北京海川利元材料科技有限公司 | Cholesteric liquid crystal and reflective-type circular polarization sheet thereof, and manufacturing method |
| CN108292000A (en) * | 2015-12-25 | 2018-07-17 | Jxtg能源株式会社 | Optical film |
| CN109917594A (en) * | 2019-03-19 | 2019-06-21 | 华南师范大学 | A kind of secret protection infrared external reflection smart window and preparation method thereof |
| CN110262093A (en) * | 2019-06-14 | 2019-09-20 | 华南师范大学 | Laser detector, detection system and laser detecting method |
| CN111087818A (en) * | 2019-12-06 | 2020-05-01 | 深圳市国华光电科技有限公司 | Responsive material based on semi-interpenetrating polymer network and application thereof |
| CN112987378A (en) * | 2021-03-26 | 2021-06-18 | 国信宝威(北京)科技有限公司 | Reverse light modulation film and preparation method thereof |
| CN113004729A (en) * | 2021-02-25 | 2021-06-22 | 张家港莱拓新材料科技有限公司 | Novel polymerizable mesogenic mixture coating and application thereof in near-infrared band |
| CN113381284A (en) * | 2021-06-30 | 2021-09-10 | 华南师范大学 | Polymer cholesteric liquid crystal laser, preparation method thereof and optical equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002350642A (en) * | 2001-05-28 | 2002-12-04 | Fuji Photo Film Co Ltd | Selectively reflecting film and its manufacturing method |
| JP2015072410A (en) * | 2013-10-04 | 2015-04-16 | 富士フイルム株式会社 | Thermal compression bonding film containing cholesteric liquid crystal layer and application of the same |
-
2022
- 2022-02-23 CN CN202210165643.6A patent/CN114410157B/en active Active
-
2023
- 2023-02-02 TW TW112103647A patent/TW202344632A/en unknown
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200641069A (en) * | 2005-02-18 | 2006-12-01 | Dainippon Printing Co Ltd | Ink composition for forming a liquid crystal layer, and optical film, polarizing film and liquid crystal display apparatus using same |
| CN102053424A (en) * | 2009-10-26 | 2011-05-11 | 默克专利股份有限公司 | Alignment layer for planar alignment of a polymerizable liquid crystalline or mesogenic material |
| TW201506469A (en) * | 2013-08-01 | 2015-02-16 | Fujifilm Corp | Production method of polarizing plate |
| TW201602189A (en) * | 2014-06-27 | 2016-01-16 | Fujifilm Corp | Transfer material of luminance-improving film, method of preparing transfer material, luminance-improving film, method of manufacturing optical sheet member using said transfer material, and optical sheet member |
| CN104777651A (en) * | 2015-04-29 | 2015-07-15 | 厦门大学 | Polymerization method for cholesteric liquid crystal grating pattern |
| CN105425327A (en) * | 2015-12-10 | 2016-03-23 | 北京海川利元材料科技有限公司 | Cholesteric liquid crystal and reflective-type circular polarization sheet thereof, and manufacturing method |
| CN108292000A (en) * | 2015-12-25 | 2018-07-17 | Jxtg能源株式会社 | Optical film |
| CN109917594A (en) * | 2019-03-19 | 2019-06-21 | 华南师范大学 | A kind of secret protection infrared external reflection smart window and preparation method thereof |
| CN110262093A (en) * | 2019-06-14 | 2019-09-20 | 华南师范大学 | Laser detector, detection system and laser detecting method |
| CN111087818A (en) * | 2019-12-06 | 2020-05-01 | 深圳市国华光电科技有限公司 | Responsive material based on semi-interpenetrating polymer network and application thereof |
| CN113004729A (en) * | 2021-02-25 | 2021-06-22 | 张家港莱拓新材料科技有限公司 | Novel polymerizable mesogenic mixture coating and application thereof in near-infrared band |
| CN112987378A (en) * | 2021-03-26 | 2021-06-18 | 国信宝威(北京)科技有限公司 | Reverse light modulation film and preparation method thereof |
| CN113381284A (en) * | 2021-06-30 | 2021-09-10 | 华南师范大学 | Polymer cholesteric liquid crystal laser, preparation method thereof and optical equipment |
Non-Patent Citations (1)
| Title |
|---|
| 胆甾相液晶聚合物薄膜的制备及其宽波反射性能研究;李丽 等;《化工新型材料》;20151015;第43卷(第10期);40-42 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114410157A (en) | 2022-04-29 |
| TW202344632A (en) | 2023-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114410157B (en) | Alignment coating liquid and application thereof | |
| CN1738711B (en) | Laminate containing silica and application composition for forming porous silica layer | |
| CN100437155C (en) | Resin layer surface micro structure mould-band rolling wheel shaping method and optical film | |
| KR100775727B1 (en) | An adhesive film for a display | |
| KR102245476B1 (en) | Anti-reflection film, polarizing plate, and image display device | |
| JP2011503658A (en) | Antireflection coating composition, antireflection film and method for producing the same | |
| TW201012647A (en) | Continuous manufacturing method of acrylic resin sheet | |
| CN102149667B (en) | Fluorine-based compounds and coating compositions comprising the same | |
| CN112321872B (en) | Color optical film and preparation method thereof | |
| CN102046674B (en) | Resin composition for manufacturing optical component and application thereof | |
| KR20140106443A (en) | Coating composition and plastic film prepared therefrom | |
| CN1952695A (en) | Production method of optical film | |
| EP3627216A1 (en) | Color shifting film, and backlight unit and display device which comprise same | |
| CN114280860B (en) | Liquid crystal film and preparation method and application thereof | |
| CN113064226B (en) | Flexible antistatic antireflection optical film, antistatic antireflection coating liquid and preparation method | |
| CN112457767A (en) | High-refractive-index coating and preparation method thereof | |
| CN113204063B (en) | Antistatic antireflection optical film, antistatic coating liquid, antireflection coating liquid, preparation method and application | |
| KR20020008267A (en) | Coating composition for antiglare film having excellent hardness, preparation for the same, a film using the composition and preparation for the same | |
| JP2011031575A (en) | Laminate and method for manufacturing the same | |
| JP2011081121A (en) | Optical laminate | |
| JP5484082B2 (en) | Manufacturing method of laminate | |
| EP3719548A1 (en) | Colour conversion film, and back light unit and display device comprising same | |
| TW202348402A (en) | A multicolored shell and its preparation process and application | |
| JP2011098445A (en) | Optical laminate and method for manufacturing the same, and polarizing plate and display device using the same | |
| JP2014056066A (en) | Antireflection film and production method of the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |