CN114434931A - Colorful shell and preparation process thereof - Google Patents

Colorful shell and preparation process thereof Download PDF

Info

Publication number
CN114434931A
CN114434931A CN202210165649.3A CN202210165649A CN114434931A CN 114434931 A CN114434931 A CN 114434931A CN 202210165649 A CN202210165649 A CN 202210165649A CN 114434931 A CN114434931 A CN 114434931A
Authority
CN
China
Prior art keywords
liquid crystal
multicolor
alignment
coating liquid
release material
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.)
Pending
Application number
CN202210165649.3A
Other languages
Chinese (zh)
Inventor
刁锐敏
彭钦华
崔旭龙
罗灵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Longhua Film Co ltd
Original Assignee
Sichuan Longhua Film Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sichuan Longhua Film Co ltd filed Critical Sichuan Longhua Film Co ltd
Priority to CN202210165649.3A priority Critical patent/CN114434931A/en
Publication of CN114434931A publication Critical patent/CN114434931A/en
Priority to TW112103646A priority patent/TW202348402A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/001—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/10—Removing layers, or parts of layers, mechanically or chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F216/00—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
    • C08F216/12—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 by an ether radical
    • C08F216/14—Monomers containing only one unsaturated aliphatic radical
    • C08F216/1416—Monomers containing oxygen in addition to the ether oxygen, e.g. allyl glycidyl ether
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00—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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/10—Esters
    • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
    • C08F222/102—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
    • C08F222/1025—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate of aromatic dialcohols
    • 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
    • C09D129/10—Homopolymers or copolymers of unsaturated ethers
    • 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
    • C09D135/00—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 a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D135/02—Homopolymers or copolymers of esters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0279—Improving the user comfort or ergonomics
    • H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Architecture (AREA)
  • Signal Processing (AREA)
  • Structural Engineering (AREA)
  • Polarising Elements (AREA)

Abstract

The invention discloses a magic color shell and a preparation process thereof, which comprises the following steps: s1, coating alignment coating liquid on a support to prepare a release material; s2, coating liquid crystal coating liquid on the release material to obtain a liquid crystal film; s3, attaching the liquid crystal film to the base material to obtain a multicolor attaching plate; and S4, removing the release material of the multicolor attaching plate to prepare the multicolor shell. In addition, the liquid crystal coating liquid is coated after the alignment coating liquid is aligned in the preparation process, so that the manufactured liquid crystal film has better multicolor effect, and an alignment layer formed by the alignment coating liquid is removed along with the release material, so that the obtained multicolor shell is thinner and lighter.

Description

Colorful shell and preparation process thereof
Technical Field
The invention relates to a colorful shell and a preparation process thereof, in particular to a colorful shell for a rear cover of an electronic device, especially a mobile phone, and a preparation process thereof, belonging to the technical field of high polymer materials.
Background
The mobile phone rear cover is used as a back part of the mobile phone, on one hand, the mobile phone rear cover plays a role in protecting other parts in the mobile phone, on the other hand, in order to attract eyes of consumers, a plurality of differentiated products such as a matte surface, a bright surface and a color effect appear on the appearance of the mobile phone rear cover so as to improve the appearance effect of the mobile phone, and at present, the mobile phone rear cover is mainly made of metal materials, glass materials and engineering plastics.
The metal material is a favorite material from ancient times to present, and the metal material has a metal figure from computers to mobile phones. The metal has strong rigidity and can provide enough supporting force and protection capability for protecting the mobile phone. However, the metal material as the rear cover of the mobile phone has the following disadvantages that firstly, the coloring process is difficult to be less than that of plastic, secondly, if the metal is not cut, the integrated metal has the electromagnetic shielding characteristic, so that the signal is weakened, and further the most basic communication function of the mobile phone is influenced.
Because the glass rear cover has the particularity of the material, the glass rear cover has no interference on a mobile phone signal, an NFC signal and a wireless charging magnetic field, and in addition, the glass is transparent, so a glass mobile phone with colorful light lines is manufactured by adopting new processes such as an ink silk-screen layer, a multilayer optical coating, a 3D photoetching layer and the like. However, the glass rear cover has fatal disadvantages of poor falling resistance and wear resistance, and is fragile under external force, thereby providing a poor experience for consumers. The method also brings great development prospect for glass-like materials (engineering plastics).
Due to the coming of the 5G era, the metallization removing trend of the rear cover of the mobile phone is accelerated, and the plastic shell becomes a research hotspot again. Lid behind the composite sheet compares with lid behind the glass, has the optical property of glass material, and is lighter and thinner, possess stronger anti falling nature and wearability. Meanwhile, in order to attract the eyes of consumers, the rear cover of the composite plate has a plurality of differentiated products on the appearance, such as a matte surface, a bright surface and a color effect. Especially, the rear cover of the color composite board is very popular with young consumers. However, the current popular colored rear covers on the market are mostly realized by adopting a process mode of plating a colored film for many times.
For example, the invention patent with publication number CN111196891A discloses a method for manufacturing a mobile phone back panel with a colorful effect. Mixing diethylene glycol methyl ethyl ether, tetraethylene glycol dimethyl ether, isophorone, butyrolactone and a surfactant, then putting the mixture into a metal complex dye solution, stirring for 15-20min at the speed of 450-plus-one 600rpm, heating to 40-50 ℃, stirring until the mixture is completely dissolved, curing for 1.5-2h to obtain the aurora colorful ink-jet ink for the mobile phone back plate, and then filtering and filling the prepared aurora colorful ink-jet ink in a multi-stage filtration manner to obtain the mobile phone back plate with the colorful effect. However, the preparation method has the disadvantages of difficult process, low production efficiency and stiff color display effect, and is difficult to satisfy the continuously-improved requirements of consumers.
For example, the patent publication No. CN113141429A discloses a color-changing colorful mobile phone rear cover. This patent is through establishing the one deck anti sclerosis layer of scraping at the upper surface of plastics substrate layer, has the various layer of dazzling, has the discoloration layer of texture, insulating reflection stratum in the lower surface coating in proper order of substrate layer, then at insulating reflection stratum lower surface printing one deck insulating ink layer, the lower surface on insulating ink layer has one deck or multilayer glass fiber stiffening plate and makes through the subsides of one deck adhesive layer. Under the action of an external excitation light source, the photochromic layer of the mobile phone back plate can realize the color changing effect, so that the aesthetic effect of the mobile phone back cover is improved, but the structure and the preparation process are complex.
In recent years, in order to improve the defects of the mobile phone back plate plated with a color film in the aspects of preparation process and color effect display, the use of a resin layer capable of changing the refractive index of light is introduced, for example: the utility model with publication number CN214381674U discloses a shell composed of a substrate, a liquid crystal optical film layer and a reflective layer, wherein the substrate can be made of a composite board of PC and PMMA, the liquid crystal optical film layer can contain oriented liquid crystal, on one hand, incident light entering the liquid crystal optical film layer can be partially reflected by the oriented liquid crystal, thereby improving the overall brightness and glossiness of the shell; on the other hand, the oriented liquid crystal reflects light rays and then presents a certain main color, and the wavelength of the reflected light is different along with the change of the incident angle of incident light, so that when the observation angle of a user is different, 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 the whole shell has a dazzling effect. Furthermore, due to the arrangement of the reflecting layer, the reflectivity is high, the brightness and the glossiness of the shell can be improved, and therefore the shell can be matched with the liquid crystal optical film layer to achieve a high-brightness colorful effect. This patent discloses a compound mode of liquid crystal optics rete and reflection stratum, wherein, the liquid crystal optics rete is by reflection stratum and liquid crystal layer complex and finally realize dazzling various effect to the reflection of incident light, and the purpose of reflection stratum lies in improving the holistic luminance of casing and gloss to make the casing present the more bright various effect of dazzling. However, because the optical film in the patent is formed by combining the liquid crystal optical film layer and the multilayer reflection layer, the thickness of the mobile phone rear cover is greatly increased, the light weight of the mobile phone rear cover is not facilitated, and further the use experience of consumers is poor.
Disclosure of Invention
The invention aims to provide a preparation process of a magic color shell, which is characterized in that a liquid crystal film is prepared by sequentially coating alignment coating liquid and liquid crystal coating liquid on a support body, and then the liquid crystal film is attached to a base material to prepare the magic color shell. Therefore, the invention also provides the multicolor shell prepared by the preparation process.
The invention is realized by the following technical scheme: a preparation process of a magic color shell comprises the following steps:
s1, coating alignment coating liquid on a support to prepare a release material;
s2, coating liquid crystal coating liquid on the release material to obtain a liquid crystal film;
s3, attaching the liquid crystal film to the base material to obtain a multicolor attaching plate;
and S4, removing the release material of the multicolor attaching plate to obtain the multicolor shell.
In step S1, the release material is prepared by applying the alignment coating liquid to the support, drying, and rubbing for alignment.
The alignment coating liquid comprises, by mass, 8-15% of a liquid crystal guiding agent, 60-85% of a solvent and 3-8% of other components.
The liquid crystal guiding agent is water-soluble polyvinyl alcohol and/or derivatives thereof.
The support is a film obtained by extrusion molding of a thermoplastic resin.
In step S2, the liquid crystal coating liquid is coated on the release material, and then dried and cured to obtain the liquid crystal film.
The liquid crystal coating liquid is cholesteric liquid crystal, and 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 by mass percent.
The base material is selected from a PC/PMMA composite board, a PC board or a PMMA board, and meets the following indexes:
reflectance ratio: more than or equal to 50 percent;
light transmittance: not less than 75%;
haze: < 2%;
hardness: 500 g/F;
flame retardant property: no perforations are made in the combustion 60S.
A magic color shell is prepared by the preparation process.
Further, the multicolor shell meets the following indexes:
transfer printing adhesive force: 5B;
core wavelength tolerance: plus or minus 5 nm;
reflectance ratio: not less than 40 percent;
haze: < 2%.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides a preparation process of a magic color shell, which comprises the steps of firstly coating alignment coating liquid on a support body to form an alignment layer, then coating liquid crystal coating liquid on the alignment layer to form a liquid crystal layer, and finally transferring the liquid crystal layer to a substrate in a release mode to obtain the magic color shell.
(2) The preparation process is simple, the high-brightness colorful shell can be realized by directly attaching a liquid crystal layer (cholesteric liquid crystal film) on the substrate with high reflectivity and high light transmittance, and compared with the colorful shell formed by the existing (multi-layer) reflecting layer and the liquid crystal layer, the preparation period of the shell is greatly shortened and the production cost is reduced.
(3) The colorful shell prepared by the invention only consists of the base material and the liquid crystal layer, the liquid crystal layer is formed by coating, drying and curing the liquid crystal coating liquid on the alignment layer after alignment, the colorful shell has a multi-layer liquid crystal lattice structure, and the colorful effect can be realized without adding a reflecting layer or other alignment layers. When the liquid crystal display panel is used, when visible light irradiates the multilayer liquid crystal lattice structure, Bragg reflection occurs to form bright luster like metal, and the luster changes along with the change of a visual angle.
(4) The colorful shell prepared by the invention has a simple structure, the colorful effect is shown by the multi-layer liquid crystal lattice structure of the liquid crystal layer, the color generation mode is a physical color generation mode, the color is bright and stable, and the color is not faded due to the influence of external conditions such as sunlight, temperature, humidity and the like. Under the irradiation of natural light, the colorful effect has stereoscopic impression, which causes great visual impact to consumers and can satisfy the multi-directional demands of consumers.
(5) The invention is suitable for the shell of electronic products, in particular to portable electronic products such as a mobile phone rear cover, a notebook computer, a tablet personal computer and the like, has light and thin structure, is easy to favor by users, has bright appearance and can meet the pursuit of users on appearance effect.
Drawings
FIG. 1 is a structural diagram of a liquid crystal layer according to the present invention.
FIG. 2 is a drawing of a liquid crystal film according to the present invention.
Fig. 3 is a comparative picture of the rear cover of the magic color mobile phone of the present invention.
FIG. 4 is a schematic diagram of the magic color effect of different vision of the rear cover of the magic color mobile phone.
Detailed Description
The objects, technical solutions and advantageous effects of the present invention will be described in further detail below.
It is to be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention claimed, and unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In order to make the rear cover shell of electronic products such as mobile phones and the like show a colorful effect with changeable colors under different excitation light sources, the technology of ink jet, coating and the like is generally adopted for realizing the colorful effect. For example, in the color-changing magic-color mobile phone rear cover disclosed in CN113141429A, the lower surface of the plastic substrate layer is sequentially coated with the colorful layer, the color-changing layer with texture, and the insulating reflective layer to realize the colorful effect, but the color-changing magic-color mobile phone rear cover has the defect of complicated structure and preparation process. Still like the electronic equipment casing that CN214381674U disclosed, adopt reflection stratum and liquid crystal optics rete to constitute the effect diaphragm, wherein, liquid crystal optics rete contains through oriented liquid crystal, and incident light can present certain primary color after the liquid crystal of orientation reflects, has simultaneously dazzles various effect, and the reflection stratum then can further improve the luminance of casing and dazzle various effect. However, the reflective layer is thick, which increases the overall thickness of the housing, and is not favorable for lightening the rear cover of the mobile phone, thereby reducing the user experience. Therefore, based on the problems of the existing colorful shell in the aspects of the structure, the preparation process, the user experience and the like, the invention provides the colorful shell with the novel structure and the preparation process thereof, and solves the following technical problems:
(1) the liquid crystal lattices in the liquid crystal coating liquid coated on the alignment layer can be guided by utilizing the alignment effect of the alignment layer, so that a liquid crystal layer with a multi-layer liquid crystal lattice structure is formed, and the multicolor effect is further realized.
(2) In the aspect of the preparation process, the multicolor shell is prepared in a release mode, a continuous winding coating process can be adopted in the preparation process, large-scale batch production can be realized, and the production efficiency is improved.
(3) The liquid crystal layer after alignment has a multi-layer liquid crystal lattice structure, and is subjected to Bragg reflection by light source irradiation, so that a novel multicolor effect can be realized, the novel multicolor liquid crystal display has metallic colors and colors, the effect presents stereoscopic impression and different colors along with the change of visual angles, and the color is bright and stable and does not change due to the adjustment of sunlight, temperature, humidity and the like.
The following is a further description of the technical solution of the present invention:
the invention relates to a colorful shell, which comprises the following steps:
step one, coating an alignment coating liquid on a support body with the thickness of 80-300 microns, sending the coated support body into a drying device, heating the support body at 80-100 ℃ for 3-10 min to form an alignment film, continuously performing rubbing alignment on the film, for example, performing rubbing treatment on the surface of the alignment film by paper or gauze, felt, rubber, nylon or polyester fiber in a certain direction to obtain an aligned alignment layer, wherein the alignment layer and the support body form a release material.
The support is a film formed by extruding thermoplastic resin, and can be one or a mixture of more of polyester resin, polycarbonate resin, polystyrene resin, polyacrylate resin, polymethacrylate resin, polyurethane resin, polyethylene resin and polyvinyl chloride resin, preferably polyethylene terephthalate resin PET.
The alignment coating liquid comprises, by mass, 8-15% of a liquid crystal guiding agent, 60-85% of a solvent and 3-8% of other components. Liquid crystal directors include, but are not limited to, polyvinyl alcohol, 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 alcohols such as methanol, ethanol and the like; 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 solvents may be used alone or in combination of two or more, and in the present invention, one or more of alcohol solvents may be preferably used. Other components can be selected from known surfactants, which can improve the coating properties of the alignment layer solution and the liquid crystal coating solution, including but not limited to nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, polyalkylene oxide surfactants, fluorosurfactants, and the like, and fluorosurfactants can be preferred.
As a method for applying the alignment coating liquid, 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 flexographic coating method, an inkjet method, a die coating method, a coating method (capcoating), a dip coating method, a slit coating method, or the like can be used. In practice, the support is continuously transported in the transport direction, and then the alignment coating liquid is applied to the support by any of the above-described application methods.
The drying equipment can adopt the prior known hot air type heating, near infrared heating, far infrared heating, microwave heating and other modes.
And step two, coating liquid crystal coating liquid on the alignment layer of the release material, and conveying the coated release material into a multi-stage oven. Firstly, drying the mixture in a first drying box at the drying temperature of 70-80 ℃, 80-90 ℃ and 90-100 ℃ respectively along the conveying direction of the mixture; then cooling the mixture by a cooling box at the temperature of 20-40 ℃; and finally, the mixture enters a second drying box, tempering and drying are carried out 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 liquid crystal coating liquid forms a liquid crystal coating on the alignment layer, so that liquid crystal sequencing is more orderly. Then curing for 10-20 s under the irradiation of ultraviolet light with the wavelength of 250-370 nm, wherein the curing capacity is 350mj/cm2The initiator in the liquid crystal coating can be excited to further initiate the polymerization of the liquid crystal monomer, so that the liquid crystal coating is crosslinked and cured, and then the liquid crystal coating is obtainedTo a liquid crystal layer having a multi-layer liquid crystal cell structure with a certain hardness. In the present invention, the liquid crystal layer and the release material form a liquid crystal film.
The liquid crystal coating liquid is cholesteric liquid crystal, molecules in the cholesteric phase are arranged in layers under the action of the alignment layer, the molecules in each layer are arranged in parallel, a tiny included angle (about 1/6-1/3 degrees) exists in the arrangement direction of each layer, the molecules in each layer are arranged spirally on the whole, and therefore after a certain number of layers, the arrangement direction of the molecules is the same as that of the first layer, and a periodic spiral structure is formed. The distance that a molecular helix rises after one revolution in a cholesteric liquid crystal is called the pitch P. Because the molecular arrangement directions of all layers of the cholesteric liquid crystal are different, only the reflected light of two layers of liquid crystals with the same arrangement direction has interference conditions, namely two layers of liquid crystals (the distance is half of the pitch P) with the molecular arrangement directions being 180 degrees form a Bragg reflection structure, and the wavelength of the reflected light meets the following formula (1):
λ=2npsinθ （1）
in the formula (1), λ is the wavelength of reflected light, θ is the angle of incident light on the surface of the liquid crystal layer, n is the refractive index of the liquid crystal, and P is the pitch of cholesteric liquid crystal, which is inversely proportional to the concentration of chiral molecules in the cholesteric liquid crystal. In use, with the change of the observation angle of the user, theta changes, and the incident light angle is the same as the reflected light angle, so in terms of the identity of the observer, with the continuous inclination of the observation angle, the light reflected to the eyes of the observer gradually changes from long wave to short wave, which means the change of color, and the phenomenon of color change with the change of the observation angle is called 'angle-changing easy color'. For the liquid crystal layer of the invention, as the molecules of each layer of the cholesteric liquid crystal are arranged in a multilayer layer and form a Bragg reflection structure, as shown in figure 1, when the angle of an observer changes, the color can change obviously and continuously to generate a magic color effect, and in the actual production process, the pitch P of the cholesteric liquid crystal can be adjusted by changing the component proportion of the cholesteric liquid crystal, so that the control on the wavelength lambda of the reflected light is realized, the magic color effect of the required color is obtained, and the user requirements are further met.
Further, the cholesteric liquid crystal comprises, by mass, 12-38% of an achiral polymerizable monomer, 2-5% of a chiral polymerizable monomer, 0.03-3% of an initiator, 1-3% of an auxiliary agent and 60-80% of a solvent.
Wherein, achiral polymerizable monomer includes the polymerizable monomer of difunctional and the polymerizable monomer of monofunctional:
the bifunctional polymerizable monomer satisfies the following formula (2):
Figure DEST_PATH_IMAGE001
（2）
in the formula (2), m and n are respectively any natural number of 4-8, R1Represents 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, R1A polymerized monomer that is a hydrogen atom; m and n are each 6, R1A polymerized monomer which is a methoxy group, and the like.
The monofunctional polymerizable monomer satisfies the following formula (3):
Figure 309216DEST_PATH_IMAGE002
（3）
in the formula (3), R2Represents 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, R2A polymerized monomer that is a hydrogen atom; r2A polymerized monomer that is methyl; r2Polymeric monomers that are phenyl groups, and the like.
The chiral polymerizable monomer can be selected from CN, CB15, S811, R1011 and chiral agents with the structure shown in the following formula (4):
Figure DEST_PATH_IMAGE003
（4）
initiators include, but are not limited to, azo, peroxy, and redox types. They can also be classified into water-soluble initiators (such as inorganic persulfates, hydrogen peroxide, water-soluble azo initiators, etc.) and oil-soluble initiators (soluble in monomers or organic solvents) based on their solubility. The polymerizable liquid crystal composition (cholesteric liquid crystal) of the present invention preferably contains at least one polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator. As the thermal polymerization initiator, benzoyl peroxide, 2' -azobisisobutyronitrile and the like can be used. As the photopolymerization initiator, benzoin ethers, benzophenones, acetophenones, benzil ketals, thioxanthones, and the like can be used.
The auxiliary agent can be a flame retardant, a defoaming agent and a hardening accelerator. Wherein the flame retardant is mainly a halogen-free flame retardant, and can be a phosphorus flame retardant, a nitrogen flame retardant, an intumescent flame retardant and the like, and further can be tricresyl phosphate, triphenyl phosphate, triisopropylphenyl phosphate, tributyl phosphate, trioctyl phosphate, cresyl diphenyl phosphate, melamine and the like. The defoaming agent is preferably a silicone-based defoaming agent, and such a defoaming agent is described in H2And the silicon oil has high activity, and the basic characteristics of stable chemical properties, wide application range, low volatility, no toxicity, outstanding defoaming capability and the like, and can be polydimethylsiloxane, ethylene glycol siloxane, hydroxyl silicon oil, fluorosilicone and the like. The curing accelerator may be selected from the following in order to ensure the mechanical strength of the formed liquid crystal layer and the stability of the liquid crystal alignment property: the compound having a phenol group, a silanol group, a thiol group, a phosphoric acid group, a sulfonic acid group, a carboxyl group, a carboxylic anhydride group, or the like, and among them, a compound having a phenol group or a silanol group is preferable. Specific examples thereof include compounds having a phenol group such as: cyanophenol, nitrophenol, methoxyphenoxyphenol, thiophenophenol, 4-benzylphenol, etc.; examples of the compound having a silanol group include: trimethylsilanol, triethylsilanol, 1, 4-bis (hydroxydimethylsilyl) benzene, triphenylsilanol, diphenylsilanediol, and the like.
The solvent is organic solvent selected from one or more of toluene, xylene, cumene, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, acetone, butanone, cyclopentanone, etc.
And step three, gluing the liquid crystal film by a gluing roller, wherein the speed of the gluing roller is 2-8 m/min, a gluing gap is 100-200 microns, gluing is carried out, a liquid crystal layer of the liquid crystal film is attached to the PC/PMMA composite board, LED lamp curing and mercury lamp curing are carried out, the power of an LED lamp is 30-50%, the temperature of the mercury lamp is 70-90 ℃, and the current of the mercury lamp is 27-37A, so that the multicolor attaching plate can be prepared.
The multicolor attaching plate obtained by the preparation process specifically comprises a PC/PMMA composite plate, a liquid crystal layer and a release material, and the multicolor shell consisting of the PC/PMMA composite plate and the liquid crystal layer can be obtained after the release material is peeled.
The following examples are provided to further illustrate the embodiments of the present invention, but the scope of the present invention is not limited to the following embodiments. The percentages referred to in the following examples are mass fractions.
Example 1: magic color mobile phone rear cover
The alignment coating liquid and the liquid crystal coating liquid are prepared according to the following formulas respectively:
the formula of the alignment coating liquid is as follows: 15% of polyvinyl alcohol, 80% of methanol and water and 5% of fluorine-containing surfactant.
The liquid crystal coating liquid formula comprises: a monomer satisfying the formula (2) (wherein m and n are each 4, R1Is a hydrogen atom) 10%, a monomer satisfying the formula (3) (R thereof2Methyl) 8%, CN 3%, 2' -azobisisobutyronitrile 0.15%, tricresyl phosphate 1%, polydimethylsiloxane 1%, trimethylsilanol 1% and toluene 76%.
Coating the alignment coating liquid on PET with the thickness of 100 mu m by a gravure coating method, feeding the PET into a hot air drying device after coating, heating the PET at 80-85 ℃ for 5min to form an alignment thin film on the PET film, rubbing and aligning the PET film by gauze to form an alignment layer, and obtaining a release material, wherein the performance indexes of the release material are shown in the following table 1. The liquid crystal coating liquid is coated on the alignment layer of the release material according to a gravure coating method, and the coated release material is sent into a multi-stage oven. In the first drying box, the drying temperature is along the conveying directionRespectively setting the temperature to 70-75 ℃, 80-85 ℃ and 95-100 ℃; then cooling the mixture by a cooling box at the temperature of 20-22 ℃; finally, the mixture enters a second drying box, is tempered and dried again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction of the mixture, and the mixture is tempered and then cured for 15s under the irradiation of ultraviolet light with the wavelength of 350nm, wherein the curing capacity is 350mj/cm2. The liquid crystal coating is solidified through polymerization and crosslinking, a liquid crystal layer, namely a liquid crystal film, is formed on a release material, the liquid crystal film is glued through a gluing roller, the speed of the gluing roller is 6m/min, the gluing gap is 100 microns, after gluing, the liquid crystal layer of the liquid crystal film is attached to a PC/PMMA composite board (the performance index is shown in the following table 2), LED lamp solidification and mercury lamp solidification are carried out, the power of an LED lamp is 50%, the temperature of a mercury lamp is 80 ℃, the current of the mercury lamp is 35A, and the release material is removed, so that the rear cover of the multicolor mobile phone is obtained.
TABLE 1 Performance index of Release materials
Figure 662574DEST_PATH_IMAGE004
TABLE 2 Performance index of PC/PMMA clad plate
Figure DEST_PATH_IMAGE005
Example 2: magic color mobile phone rear cover
The alignment coating liquid and the liquid crystal coating liquid are prepared according to the following formulas respectively:
the formula of the alignment coating liquid is as follows: 8% of polyvinyl alcohol, 85% of methanol and water and 7% of anionic surfactant.
The liquid crystal coating liquid formula comprises: a monomer satisfying the formula (2) (wherein m and n are each 6, R1Is a methoxy group) 15%, a monomer satisfying the formula (3) (R thereof2Methyl group) 20%, a chiral agent 2 satisfying formula (4), a benzoin ether initiator 0.05%, tricresyl phosphate 0.05%, a hydroxy silicone oil 0.05%, trimethylsilanol 0.05%, and toluene 62.8%.
Coating the above alignment coating solution on PET with a thickness of 80 μm by gravure coating methodAnd (2) feeding the cloth into a hot air drying device, heating for 8min at 95-100 ℃, forming an alignment thin film on the PET film, rubbing and aligning the PET film by using gauze to form an alignment layer, and obtaining a release material, wherein the performance index of the release material is shown in table 1. The liquid crystal coating liquid is coated on the alignment layer of the release material according to a gravure coating method, and the coated release material is sent into a multi-stage oven. In a first drying box, the drying temperature is respectively set to be 75-80 ℃, 80-85 ℃ and 90-95 ℃ along the conveying direction; then cooling the mixture through a cooling box at the temperature of 35-40 ℃; finally, the mixture enters a second drying box, is tempered and dried again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction of the mixture, and the mixture is tempered and then cured for 20s under the irradiation of ultraviolet light with the wavelength of 350nm, wherein the curing capacity is 350mj/cm2. The liquid crystal coating is solidified through polymerization and crosslinking, a liquid crystal layer, namely a liquid crystal film, is formed on a release material, the liquid crystal film is glued through a gluing roller, the speed of the gluing roller is 2m/min, the gluing gap is 100 microns, after gluing, the liquid crystal layer of the liquid crystal film is attached to a PC/PMMA composite board (meeting the parameters shown in the table 2), LED lamp solidification and mercury lamp solidification are carried out, the power of an LED lamp is 30%, the temperature of a mercury lamp is 70 ℃, the current of the mercury lamp is 37A, and the release material is removed, so that the rear cover of the multicolor mobile phone is obtained.
Example 3: magic mobile phone back cover
The alignment coating liquid and the liquid crystal coating liquid are prepared according to the following formulas respectively:
the formula of the alignment coating liquid is as follows: 10% of polyvinyl alcohol, 82% of methanol and water and 8% of fluorine-containing surfactant.
The liquid crystal coating liquid formula comprises: a monomer satisfying the formula (2) (wherein m is 4, n is 6, R1Is methyl) 25%, a monomer satisfying the formula (3) (R thereof2Phenyl) 5%, R10115%, benzoyl peroxide 1%, tricresyl phosphate 1%, 1, 4-bis (hydroxydimethylsilyl) benzene 0.5% and ethyl acetate 62.5%.
Coating the alignment coating liquid on PET with a thickness of 120 μm by gravure coating method, feeding into hot air drying equipment, heating at 95-100 deg.C for 3min to form an alignment film on the PET film, and rubbing the PET film with gauze to form alignment patternForming an alignment layer, and obtaining a release material, wherein the performance index of the release material is shown in table 1. The liquid crystal coating liquid is coated on the alignment layer of the release material according to a gravure coating method, and the coated release material is sent into a multi-stage oven. In the first drying box, the drying temperature is respectively set to be 70-75 ℃, 85-90 ℃ and 95-100 ℃ along the conveying direction; then cooling the mixture by a cooling box at the temperature of 30 ℃; finally, the mixture enters a second drying box, is tempered and dried again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction of the mixture, and after tempering treatment, the mixture is cured for 10s under the irradiation of 370nm ultraviolet light, wherein the curing capacity is 350mj/cm2. The liquid crystal coating is solidified through polymerization and crosslinking, a liquid crystal layer, namely a liquid crystal film, is formed on a release material, the liquid crystal film is glued through a gluing roller, the speed of a gluing wheel is 8m/min, the gluing gap is 200 micrometers, after gluing, the liquid crystal layer of the liquid crystal film is attached to a PC/PMMA composite board (meeting the parameters shown in table 2), LED lamp solidification and mercury lamp solidification are carried out, the power of an LED lamp is 35%, the temperature of a mercury lamp is 75 ℃, the current of the mercury lamp is 33A, and the release material is removed, so that the rear cover of the multicolor mobile phone is obtained.
Example 4: magic color mobile phone rear cover
The alignment coating liquid and the liquid crystal coating liquid are prepared according to the following formulas respectively:
the formula of the alignment coating liquid is as follows: 11% of polyvinyl alcohol, 85% of ethanol and water and 4% of cationic surfactant.
The liquid crystal coating liquid formula comprises: a monomer satisfying the formula (2) (wherein m and n are each 5, R1Is phenyl) 6%, a monomer satisfying the formula (3) (R thereof2Ethyl) 6%, a chiral agent satisfying formula (4) 5%, 2' -azobisisobutyronitrile 1.5%, polydimethylsiloxane 0.5%, cyanophenol 1%, and xylene 80%.
Coating the alignment coating liquid on PET with the thickness of 150 mu m by a gravure coating method, feeding the PET into a hot air drying device after coating, heating for 6min at 85-90 ℃, forming an alignment thin film on the PET film, rubbing and aligning the PET film by gauze to form an alignment layer, and obtaining a release material, wherein the performance index of the release material is shown in table 1. Coating the alignment layer of the release material by gravure coating methodAnd (3) coating the liquid crystal coating liquid, and conveying the coated release material into a multi-stage oven. In a 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 the temperature of 35 ℃; finally, the mixture enters a second drying box, is tempered and dried again, the tempering temperature is sequentially set to be 90-100 ℃, 80-90 ℃ and 70-80 ℃ along the conveying direction of the mixture, and after tempering treatment, the mixture is cured for 10s under the irradiation of 370nm ultraviolet light, wherein the curing capacity is 350mj/cm2. The liquid crystal coating is solidified through polymerization and crosslinking, a liquid crystal layer, namely a liquid crystal film, is formed on a release material, the liquid crystal film is glued through a gluing roller, the speed of the gluing roller is 5m/min, the gluing gap is 150 microns, after gluing, the liquid crystal layer of the liquid crystal film is attached to a PC/PMMA composite board (meeting the parameters shown in the table 2), LED lamp solidification and mercury lamp solidification are carried out, the power of an LED lamp is 45%, the temperature of a mercury lamp is 90 ℃, the current of the mercury lamp is 30A, and the release material is removed, so that the rear cover of the multicolor mobile phone is obtained.
Example 5: colorful flat plate rear cover
The alignment coating liquid and the liquid crystal coating liquid are prepared according to the following formulas respectively:
the formula of the alignment coating liquid is as follows: 12% of polyvinyl alcohol, 80% of methanol and water and 8% of fluorine-containing surfactant.
The liquid crystal coating liquid formula comprises: a monomer satisfying the formula (2) (wherein m and n are each 4, R1Hydrogen atom) 15%, a monomer satisfying the formula (3) (R thereof2Methyl group) 10%, a chiral agent satisfying the formula (4) 4%, a benzophenone initiator 0.05%, tricresyl phosphate 1%, polydimethylsiloxane 0.5%, trimethylsilanol 1.45%, and toluene 68%.
Coating the alignment coating liquid on PET with the thickness of 300 mu m by a gravure coating method, feeding the PET into a hot air drying device after coating, heating at 95-100 ℃ for 10min to form an alignment thin film on the PET film, rubbing and aligning the PET film by gauze to form an alignment layer, and obtaining a release material, wherein the performance index of the release material is shown in Table 1. The liquid crystal coating liquid is coated on the alignment layer of the release material according to a gravure coating method, and the coated release material is sent into a multi-stage oven. In the first drying box, the drying temperature isThe temperature is respectively set to be 75-80 ℃, 90 ℃ and 100 ℃ along the conveying direction; then cooling the mixture by a cooling box at the temperature of 38 ℃; finally, the mixture enters a second drying box, is tempered and dried again, the tempering temperature is sequentially set to be 90-95 ℃, 80-85 ℃ and 70-75 ℃ along the conveying direction of the mixture, and after tempering treatment, the mixture is cured for 10s under the irradiation of 370nm ultraviolet light, wherein the curing capacity is 350mj/cm2. The liquid crystal coating is solidified through polymerization and crosslinking, a liquid crystal layer, namely a liquid crystal film, is formed on a release material, the liquid crystal film is glued through a gluing roller, the speed of a gluing wheel is 8m/min, the gluing gap is 120 micrometers, after gluing, the liquid crystal layer of the liquid crystal film is attached to a PC/PMMA composite board (meeting the parameters shown in table 2), LED lamp solidification and mercury lamp solidification are carried out, the power of an LED lamp is 50%, the temperature of a mercury lamp is 70 ℃, the current of the mercury lamp is 27A, and the release material is removed, so that the multicolor flat plate rear cover is obtained.
Example 6: colorful flat plate rear cover
The alignment coating liquid and the liquid crystal coating liquid are prepared according to the following formulas respectively:
the formula of the alignment coating liquid is as follows: 15% of polyvinyl alcohol, 80% of methanol and water and 5% of fluorine-containing surfactant.
The liquid crystal coating liquid formula comprises: a monomer satisfying the formula (2) (wherein m and n are each 4, R1Is a hydrogen atom) 17%, a monomer satisfying the formula (3) (R thereof2Methoxy) 10%, S8114%, 2' -azobisisobutyronitrile 1%, fluorosilicone 1%, nitrophenol 1% and toluene 66%.
Coating the alignment coating liquid on PET with the thickness of 270 mu m by a gravure coating method, feeding the PET into a hot air drying device after coating, heating the PET at 95-100 ℃ for 10min to form an alignment thin film on the PET film, rubbing and aligning the PET film by gauze to form an alignment layer, and obtaining a release material, wherein the performance index of the release material is shown in Table 1. The liquid crystal coating liquid is coated on the alignment layer of the release material according to a gravure coating method, and the coated release material is sent into a multi-stage oven. In the first drying box, the drying temperature is respectively set to be 75-80 ℃, 90 ℃ and 100 ℃ along the conveying direction; then cooling the mixture by a cooling box at the temperature of 35 ℃; finally, the mixture enters a second drying box, and is tempered and dried again, and the tempering temperature is highThe temperature is sequentially set to 90-95 ℃, 80-85 ℃ and 70-75 ℃ along the conveying direction, and after tempering treatment, the mixture is cured for 15s under the irradiation of ultraviolet light with the wavelength of 350nm, and the curing capacity is 350mj/cm2. The liquid crystal coating is solidified through polymerization and crosslinking, a liquid crystal layer, namely a liquid crystal film, is formed on a release material, the liquid crystal film is glued through a gluing roller, the speed of the gluing roller is 5m/min, the gluing gap is 150 microns, after gluing, the liquid crystal layer of the liquid crystal film is attached to a PC/PMMA composite board (meeting the parameters shown in the table 2), LED lamp solidification and mercury lamp solidification are carried out, the power of an LED lamp is 45%, the temperature of a mercury lamp is 80 ℃, the current of the mercury lamp is 35A, and the release material is removed, so that the multicolor flat plate rear cover is obtained.
The liquid crystal film and the multicolor rear cover according to examples 1 to 6 were subjected to the experiment, and the measured performance indexes thereof are shown in tables 3 and 4 below.
TABLE 3 Performance index of liquid crystal film
Figure 379995DEST_PATH_IMAGE006
TABLE 4 Performance index of the multicolor rear cover
Figure DEST_PATH_IMAGE007
Taking example 1 as an example, the picture of the liquid crystal film can refer to the photograph shown in fig. 2, and the liquid crystal film presents different gradient colors according to different incident light angles and also has a certain light transmittance. The liquid crystal film shown in a is gradually changed from green → yellow → red in the direction of the arrow mark, and the liquid crystal film shown in b is gradually changed from orange → red in the direction of the arrow mark. Referring to the picture shown in fig. 3, the picture of the rear cover of the multicolor mobile phone made of the liquid crystal film is shot at different angles respectively for the same rear cover of the multicolor mobile phone (7 same rear covers of the mobile phone from left to right), which are A, B, C groups in turn, as can be seen from fig. 3, the colors of the 7 same rear covers of the mobile phone shot at the same angle are different, and meanwhile, when the shooting angle changes, the corresponding rear covers of the mobile phone are in gradually changed colors. Referring to fig. 4, under different viewing angles, an observer can observe different fantasy color effects exhibited by the mobile phone rear cover, for example, in fig. 4, the mobile phone rear cover appears red at 0 °, the mobile phone rear cover appears yellow at 45 °, and the mobile phone rear cover appears green at 70 °.
Comparative example:
this comparative example is a comparative example carried out with example 1, differing from example 1 only in that: in the preparation process, the liquid crystal coating liquid is directly coated on PET according to the same process method and parameter standard of the embodiment 1, and a liquid crystal film with a corresponding liquid crystal layer is prepared, and finally, the mobile phone rear cover is prepared according to the same mode.
The mobile phone rear cover is compared with the magic color mobile phone rear cover prepared in the embodiment 1, and an experimenter can find that the mobile phone rear cover of the comparative example shows a certain color change through visual observation, but the color change is single, usually, one color directly jumps to another color, multiple colors are not shown in a gradual change process, and the magic color effect of the magic color mobile phone rear cover in the embodiment 1 is not provided, so that the magic color mobile phone rear cover does not have an obvious visual impact effect on an observer.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (10)

1. A preparation process of a colorful shell is characterized by comprising the following steps: the method comprises the following steps:
s1, coating alignment coating liquid on a support to prepare a release material;
s2, coating liquid crystal coating liquid on the release material to obtain a liquid crystal film;
s3, attaching the liquid crystal film to the base material to obtain a multicolor attaching plate;
and S4, removing the release material of the multicolor attaching plate to obtain the multicolor shell.
2. The process for preparing a multicolor casing according to claim 1, wherein: in step S1, the release material is prepared by applying the alignment coating liquid to the support, drying, and rubbing for alignment.
3. The process for preparing a multicolor casing according to claim 1, wherein: the alignment coating liquid comprises, by mass, 8-15% of a liquid crystal guiding agent, 60-85% of a solvent and 3-8% of other components.
4. The process for preparing a multicolor casing according to claim 3, wherein: the liquid crystal guiding agent is water-soluble polyvinyl alcohol and/or derivatives thereof.
5. The process for preparing a multicolor casing according to claim 1, wherein: the support is a film obtained by extrusion molding of a thermoplastic resin.
6. The process for preparing a multicolor casing according to claim 1, wherein: in step S2, the liquid crystal coating liquid is coated on the release material, and then dried and cured to obtain the liquid crystal film.
7. The process for preparing a multicolor casing according to claim 1, wherein: the liquid crystal coating liquid is cholesteric liquid crystal, and 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 by mass percent.
8. The process for preparing a fantasy color casing according to claim 1, wherein: the base material is selected from a PC/PMMA composite board, a PC board or a PMMA board, and meets the following indexes:
reflectance ratio: more than or equal to 50 percent;
light transmittance: not less than 75%;
haze: < 2%;
hardness: 500 g/F;
flame retardant property: no perforations are made in the combustion 60S.
9. An illusive color casing, comprising: the preparation method is characterized by comprising the preparation process of any one of claims 1 to 8.
10. The fantasy color casing of claim 9, wherein: the multicolor shell meets the following indexes:
transfer printing adhesive force: 5B;
core wavelength tolerance: plus or minus 5 nm;
reflectance ratio: not less than 40 percent;
haze: < 2%.
CN202210165649.3A 2022-02-23 2022-02-23 Colorful shell and preparation process thereof Pending CN114434931A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202210165649.3A CN114434931A (en) 2022-02-23 2022-02-23 Colorful shell and preparation process thereof
TW112103646A TW202348402A (en) 2022-02-23 2023-02-02 A multicolored shell and its preparation process and application

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210165649.3A CN114434931A (en) 2022-02-23 2022-02-23 Colorful shell and preparation process thereof

Publications (1)

Publication Number Publication Date
CN114434931A true CN114434931A (en) 2022-05-06

Family

ID=81374342

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210165649.3A Pending CN114434931A (en) 2022-02-23 2022-02-23 Colorful shell and preparation process thereof

Country Status (2)

Country Link
CN (1) CN114434931A (en)
TW (1) TW202348402A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114002872A (en) * 2020-07-27 2022-02-01 Oppo广东移动通信有限公司 Shell of electronic equipment, manufacturing method of shell and electronic equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114002872A (en) * 2020-07-27 2022-02-01 Oppo广东移动通信有限公司 Shell of electronic equipment, manufacturing method of shell and electronic equipment

Also Published As

Publication number Publication date
TW202348402A (en) 2023-12-16

Similar Documents

Publication Publication Date Title
CN101558335B (en) Selectively light-transmitting filter
CN114410157B (en) Alignment coating liquid and application thereof
CN1738711B (en) Laminate containing silica and application composition for forming porous silica layer
CN103176229B (en) Compound optical reflecting film
WO2014050583A1 (en) Infrared-blocking film, infrared-blocking laminated glass, and infrared-blocking member
CN102365313A (en) Cation-polymerizable resin composition and cured product thereof
CN102141643A (en) Infrared light reflecting plate, laminated interlayer film sheet for laminated glass and its production method, and laminated glass
CN102459406B (en) Cationically polymerizable resin composition and cured object obtained therefrom
CN101542328A (en) Crosslinked material, color compensating filter, optical member, image display, and liquid-crystal display
CN108943979B (en) Manufacturing method of fingerprint unlocking mobile phone protection photo-curing film
CN114280860B (en) Liquid crystal film and preparation method and application thereof
CN113204063B (en) Antistatic antireflection optical film, antistatic coating liquid, antireflection coating liquid, preparation method and application
CN114434931A (en) Colorful shell and preparation process thereof
JPWO2019167471A1 (en) Resin composition and doping for film production by solution casting method
CN113703210A (en) Diaphragm and preparation method thereof, shell and electronic equipment
CN111935346A (en) Electronic equipment shell, manufacturing method thereof and electronic equipment
CN113861475B (en) Polyester film for optical display and preparation method thereof
CN108617121A (en) The manufacturing method of electronic device and its shell and shell
CN108617123A (en) The manufacturing method of electronic device and its shell and shell
CN108583131A (en) The manufacturing method of electronic device and its shell and shell
CN102156311A (en) Optical laminate and method for manufacturing the same, and polarizing plate and display device using the same
JP2001247526A (en) Near infrared absorption compound composition and near infrared absorption filter
CN102109709B (en) Lower diffusion sheet used in small-sized LCD backlight modules and manufacture method thereof
TW201504403A (en) Broad-band-cholesteric liquid-crystal film, process for producing broad-band-cholesteric liquid-crystal film, and liquid-crystal composition
JP2009227866A (en) Method for controlling absorption zone of optical film, method for producing optical film, optical film, color purity-improved sheet, and image display device

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