CN112235984B

CN112235984B - Shell, shell preparation method and electronic equipment

Info

Publication number: CN112235984B
Application number: CN202011180557.XA
Authority: CN
Inventors: 张育民
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2022-02-18
Anticipated expiration: 2040-10-29
Also published as: CN112235984A

Abstract

The present application provides a housing comprising: a substrate layer; the optical film layer is formed on one side surface of the substrate layer; the UV transfer printing layer is formed on the surface of one side, far away from the base material layer, of the optical film layer; the UV transfer printing layer is prepared from the following raw materials: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator. A preparation method of the shell and the electronic device are also provided.

Description

Shell, shell preparation method and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to a shell, a shell manufacturing method and electronic equipment.

Background

At present, people have higher and higher requirements on optical visual effects of consumer electronic products, ornaments, artware and other appearances. For example, in order to pursue a more dazzling visual effect in a rear cover of a consumer electronic product such as a mobile phone, various optical effects can be exhibited by bonding an optical film layer to the rear cover with OCA glue, then placing the optical film layer under a template, printing a layer of UV glue, forming a UV transfer layer having a texture after UV curing, and forming an optical ink layer after peeling off the UV transfer layer from the template. The UV adhesive transfer printing layer needs to have good adhesion and weather resistance to the optical film layer, and simultaneously has good strippability so as to be stripped from the template. However, the UV transfer layer in the related art is difficult to achieve both adhesion and releasability, and poor releasability is obtained when the UV transfer layer has good adhesion and poor adhesion is also obtained when the UV transfer layer has good releasability, resulting in poor combination of adhesion and releasability.

Disclosure of Invention

In order to solve the problems, the application provides the shell, the shell preparation method and the electronic equipment, wherein the UV transfer printing layer of the shell has good adhesive force and good strippability with the template.

The application provides a housing, including: a substrate layer; the optical film layer is formed on one side surface of the substrate layer; the UV transfer printing layer is formed on the surface of one side, far away from the base material layer, of the optical film layer; the UV transfer printing layer is prepared from the following raw materials: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator.

The application also provides a preparation method of the shell, which comprises the following steps: providing a substrate layer; forming an optical film layer, wherein the optical film layer is formed on one side surface of the substrate layer; providing UV glue, forming the UV glue on the surface of one side, far away from the substrate layer, of the optical film layer, and curing to obtain a shell; wherein the UV glue comprises: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator.

The present application further provides an electronic device comprising a housing as described above.

In the shell, the shell preparation method and the electronic device provided by the embodiment of the application, the UV transfer printing layer is prepared from a raw material containing a mixture of polyurethane acrylate prepolymer and polyester acrylate prepolymer, and the matching of the polyurethane acrylate prepolymer and the polyester acrylate prepolymer can enable the UV transfer printing layer to have good adhesion and ring measurement reliability, to be easily separated from a template, and to have good strippability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structural diagram of a housing according to a first embodiment of the present application.

Fig. 2 is a schematic flow chart of a method for manufacturing a housing according to a second embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of an electronic device according to a third embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity.

A first embodiment of the present application provides a housing comprising a substrate layer; the optical film layer is formed on one side surface of the substrate layer; the UV transfer printing layer is formed on the surface of one side, far away from the base material layer, of the optical film layer; the UV transfer printing layer is prepared from the following raw materials: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator.

In the shell in the embodiment of the application, the UV transfer layer is prepared from a raw material containing a mixture of a polyurethane acrylate prepolymer and a polyester acrylate prepolymer, and the matching of the polyurethane acrylate prepolymer and the polyester acrylate prepolymer can enable the UV transfer layer to have good adhesion and ring measurement reliability, to be easily separated from a template, and to have good strippability.

Referring to fig. 1, a housing 100 according to a first embodiment of the present disclosure is provided, in which the housing 100 includes a substrate layer 10 and a UV transfer layer 20.

The material of the substrate layer 10 may be plastic, metal, ceramic or composite material, so that the application range is very wide.

In some embodiments, the material of the substrate layer 10 may be a resin, such as polyethylene resin (PE), polypropylene resin (PP), polyethylene terephthalate resin (PET), polyvinyl chloride resin (PVC), polycarbonate resin (PC), polymethyl methacrylate (PMMA), or a composite thereof.

In some embodiments, the UV transfer layer 20 is formed on one side of the substrate layer 10.

In the present application, the UV transfer layer 20 is prepared from raw materials comprising: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator. The matching of the polyurethane acrylate prepolymer and the polyester acrylate prepolymer can ensure that the UV transfer printing layer has better adhesive force and environment measurement reliability, is easy to separate from a template, and has better strippability.

In some embodiments, the urethane acrylate prepolymer comprises a 6-to 9-functionality urethane acrylate prepolymer and a 2-functionality urethane acrylate prepolymer; the 6-functionality-degree to 9-functionality-degree polyurethane acrylic prepolymer can enable the UV transfer printing layer to be cured quickly, has good transfer printing performance and is easy to peel off from a transfer printing template, the 6-functionality-degree to 9-functionality-degree polyurethane acrylic prepolymer has good ring measurement reliability, and the 2-functionality-degree aliphatic polyurethane acrylic prepolymer can enable the UV transfer printing layer to have good flexibility and good ring measurement reliability.

In some preferred embodiments, the urethane acrylate prepolymer of 6 to 9 functionality and the urethane acrylate prepolymer of 2 functionality are both aliphatic urethane acrylate prepolymers; the 6-to-9-functionality aliphatic polyurethane acrylic prepolymer can enable the UV transfer printing layer to be cured quickly, has better transfer printing performance and is easy to peel off from a transfer printing template, the 6-to-9-functionality aliphatic polyurethane acrylic prepolymer has better ring measurement reliability, and the 2-functionality aliphatic polyurethane acrylic prepolymer can enable the UV transfer printing layer to have better flexibility and better ring measurement reliability.

In some preferred embodiments, the polyester acrylate prepolymer is a 2-to 3-functional polyester acrylate prepolymer; the 2-to 3-functionality polyester acrylate prepolymer may provide the UV transfer layer with better adhesion and better ring measurement reliability.

In a preferred embodiment of the present application, the acrylate prepolymer is a mixture comprising 20 to 30 parts of the urethane acrylate prepolymer of 6 to 9 functionalities, 10 to 15 parts of the urethane acrylate prepolymer of 2 functionalities and 10 to 15 parts of the polyester acrylate prepolymer of 2 to 3 functionalities; the combination of the components can ensure that the UV transfer printing layer can be cured very quickly, and has excellent transfer printing strippability, excellent flexibility, excellent adhesion and excellent ring test reliability.

In some embodiments, the diluent is an acrylate monomer; the acrylate monomer may be selected from one or more of Dimethylacrylamide (DMAA), N-vinyl pyrrolidone (NVP), hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA).

In some embodiments, the photopolymerization initiator is present in the starting material in an amount of 2 to 4 parts.

In some embodiments, the photopolymerization initiator is a phosphine oxide species or a peroxide species.

Wherein the phosphine oxide can be benzoin and benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether and the like; acetophenones such as acetophenone, 2-dimethoxy-2-phenylacetophenone, 2-diethoxy-2-phenylacetophenone, 1-dichloroacetophenone, etc. may also be used; aminobenzophenones such as 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butane-1, and 2- (dimethylamino) -2- [ (4-methylphenyl) methyl ] -1- [4- (4-morpholino) phenyl ] -1-butane; anthraquinone such as 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone and 1-chloroanthraquinone; thioxanthones such as 2, 4-dimethylthioxanthone, 2, 4-diethylthioxanthone, 2-chlorothioxanthone and 2, 4-diisopropylthioxanthone; ketals such as acetophenone dimethyl ketal and benzil dimethyl ketal; benzophenone compounds such as benzophenone, or xanthone compounds; also can be (2, 6-dimethoxybenzoyl) -2, 4, 4-pentylphosphine oxide, bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide, 2, 4, 6-trimethylbenzoyl diphenylphosphine oxide, ethyl 2, 4, 6-trimethylbenzoyl diphenylphosphinate (ethyl-2, 4, 6-trimethylbenzoyl diphenylphosphinate); any combination of the above may also be used.

The peroxide is one or more of commercially available materials such as IRGACURE184, IRGACURE819, IRGACURE907, IRGACURE369, IRGACURE379, IRGACURE389, LUCIRIN TPO, etc., manufactured by BASF JAPAN LTD.

In some embodiments, the thickness of the UV transfer layer 20 may be 1 to 10 microns for better adhesion and better optical performance.

Referring to fig. 1, the optical film layer 30 is formed between the UV transfer layer 20 and the substrate layer 10; the adhesion force of the UV transfer printing layer 20 on the optical film layer 30 is 5B, namely, the UV transfer printing layer 20 has better adhesion force on the optical film layer 30; the adhesion rating described herein is a standard common to the north american national technical standard (ASTM), the adhesion test method is the test method of ASTM D3359-B, and 5B is the highest rating in the ASTM standard, i.e., the test result is that the cut edge is smooth and the lattice edge does not have any peel-off.

In some embodiments, the material of the optical film layer 30 is polyethylene terephthalate (PET), which has high transparency; the optical film layer 30 may be bonded to the surface of the substrate layer 10 by optical adhesive (OCA).

In some embodiments, the thickness of the optical film layer 30 may be 0.1 to 1 micron.

In some embodiments, referring to fig. 1, the housing 100 further includes a bottom-covering ink layer 40, where the bottom-covering ink layer 40 is formed on a side of the UV transfer layer 20 away from the substrate layer 10, and is used for shielding light to shield devices contained in the housing 100; the cover bottom ink layer 40 can be a plurality of layers, so as to have better light shading effect; when an adhesion test is performed on the surface of the casing 100 after the cover bottom ink layer 40 and the UV transfer layer 20 are formed, the adhesion of the cover bottom ink layer 40 and the UV transfer layer 20 on the optical film layer 30 is also 5B, so that the surface film layer of the casing 100 is not easy to fall off or crack.

In some embodiments, the thickness of the capping ink layer 40 may be 5 to 15 microns.

In some embodiments, referring to fig. 1, the housing 100 further includes a hardening layer 50, where the hardening layer 50 is formed on a side of the substrate layer 10 away from the UV transfer layer 20; the hardened layer has better mechanical property, is wear-resistant and scratch-resistant, and can protect the shell 100.

In some embodiments, the thickness of the stiffening layer 50 may be 1 to 100 microns.

In other embodiments, the housing 100 may further include a silk-screen logo, an optical coating layer, a protective film layer, and the like.

A second embodiment of the present application provides a method for manufacturing a housing, including: providing a substrate layer; providing UV glue, and forming the UV glue on one side of the substrate layer; wherein the UV glue comprises: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator.

Referring to fig. 2, a flow chart of a method for manufacturing a housing according to a second embodiment of the present application is shown, including:

s201, providing a substrate layer;

the material of the substrate layer can be plastic, metal, ceramic or composite material, so that the application range is very wide.

In some embodiments, the material of the substrate layer may be a resin, such as polyethylene resin (PE), polypropylene resin (PP), polyethylene terephthalate resin (PET), polyvinyl chloride resin (PVC), polycarbonate resin (PC), polymethyl methacrylate (PMMA), or a composite thereof.

And S202, forming an optical film layer on the surface of the base material layer.

In some embodiments, the optical film layer is made of polyethylene terephthalate (PET), and has high transparency; the optical film layer can be bonded to the surface of the substrate layer through Optical Cement (OCA).

In some embodiments, the optical film layer may have a thickness of 0.1 to 1 micron.

In some embodiments, the optical film layer can be formed on the surface of the substrate layer by vacuum-pumping and attaching, so that fewer bubbles exist between the optical film layer and the substrate layer, and the bonding force is better.

In some embodiments, after the optical film layer is attached, a high-pressure defoaming treatment may be further performed on the element attached with the optical film layer to further remove bubbles between the optical film layer and the substrate layer, so as to improve the bonding force between the optical film layer and the substrate layer.

S203, providing UV glue, forming the UV glue on the surface of one side, far away from the substrate layer, of the optical film layer, and curing the UV glue; wherein the UV glue comprises: 40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; 40 to 60 parts of a diluent; and a photopolymerization initiator.

In some embodiments, the urethane acrylate prepolymer comprises a 6-to 9-functionality urethane acrylate prepolymer and a 2-functionality urethane acrylate prepolymer; the 6-functionality-degree to 9-functionality-degree polyurethane acrylic prepolymer can enable the UV glue to be cured quickly, has good transfer printing performance and is easy to peel off from a transfer printing template, the 6-functionality-degree to 9-functionality-degree polyurethane acrylic prepolymer has good ring measurement reliability, and the 2-functionality-degree aliphatic polyurethane acrylic prepolymer can enable the formed UV transfer printing layer to have good flexibility and good ring measurement reliability.

In some preferred embodiments, the urethane acrylate prepolymer of 6 to 9 functionality and the urethane acrylate prepolymer of 2 functionality are both aliphatic urethane acrylate prepolymers; the 6-to-9-functionality aliphatic polyurethane acrylic prepolymer can enable the UV glue to be cured quickly, has better transfer printing performance and is easy to peel off from a transfer printing template, the 6-to-9-functionality aliphatic polyurethane acrylic prepolymer has better ring measurement reliability, and the 2-functionality aliphatic polyurethane acrylic prepolymer can enable the formed UV transfer printing layer to have better flexibility and better ring measurement reliability.

In some preferred embodiments, the polyester acrylate prepolymer is a 2-to 3-functional polyester acrylate prepolymer; the polyester acrylate prepolymer with the functionality of 2 to 3 can enable the UV transfer printing layer to be formed to have better adhesion and better ring measurement reliability.

In a preferred embodiment of the present application, the acrylate prepolymer is a mixture comprising 20 to 30 parts of the urethane acrylate prepolymer of 6 to 9 functionalities, 10 to 15 parts of the urethane acrylate prepolymer of 2 functionalities and 10 to 15 parts of the polyester acrylate prepolymer of 2 to 3 functionalities; the combination of the components can enable the UV adhesive to be cured very quickly, and a formed UV transfer printing layer has excellent transfer printing strippability, excellent flexibility, excellent adhesive force and excellent ring test reliability.

Wherein, the diluent can make the UV glue have proper viscosity to facilitate coating; preferably, the viscosity of the UV glue is made to be between 100 millipascal-seconds (mPa-s) and 500 mPa-s by the diluent.

The peroxide material is one or more of commercially available materials with model numbers of IRGACURE184, IRGACURE819, IRGACURE907, IRGACURE369, IRGACURE379, IRGACURE389 and LUCIRIN TPO manufactured by BASF JAPAN LTD.

In some embodiments, the thickness of the UV transfer layer may be 1 to 10 microns for better adhesion and better optical performance.

In some embodiments, the UV transfer layer may be obtained by mixing a urethane acrylate prepolymer, a polyester acrylate prepolymer, and a diluent, stirring, heating, dispersing, adding a photopolymerization initiator, dissolving the photopolymerization initiator, filtering, coating on a transfer template, transferring on one side of the substrate layer by a transfer process, and curing; wherein, the stirring speed can be 800 to 1000 revolutions per minute; the heating temperature can be about 60 ℃, and the stirring and dispersing time can be about 1 hour; the curing condition may be irradiation for 10 seconds under ultraviolet light of 500 millijoules (mJ) in energy.

The adhesive force of the UV transfer printing layer on the optical film layer is 5B, namely, the UV transfer printing layer has better adhesive force on the optical film layer; the adhesion rating described herein is a standard common to the north american national technical standard (ASTM), the adhesion test method is the test method of ASTM D3359-B, and 5B is the highest rating in the ASTM standard, i.e., the test result is that the cut edge is smooth and the lattice edge does not have any peel-off.

In some embodiments, referring to fig. 2, after the UV transfer layer is formed, the method for preparing the housing further includes:

and S204, forming a bottom ink layer on the surface of the UV transfer printing layer.

The bottom-covering ink layer is formed on one side, away from the base material layer, of the UV transfer printing layer and is used for shading light so as to shield devices contained in the shell; the bottom covering ink layer can be a plurality of layers, so that a better light shading effect is achieved; when an adhesion test is performed on the surface of the shell after the bottom covering ink layer and the UV transfer printing layer are formed, the adhesion of the bottom covering ink layer and the UV transfer printing layer on the optical film layer is also 5B, so that the surface film layer of the shell is not easy to fall off or crack.

In some embodiments, the thickness of the capping ink layer may be 5 to 15 microns.

The bottom ink layer can be formed by spraying, curtain coating and the like.

In some embodiments, referring to fig. 2, after the step of forming the bottom ink layer, the method for manufacturing the housing further includes the steps of:

s205, the base material layer is far away from a hardening layer is formed on the surface of the UV transfer printing layer.

The hardened layer has better mechanical property, is wear-resisting and scratch-resistant, and can protect the shell.

In some embodiments, the thickness of the stiffening layer may be 1 to 100 microns.

In other embodiments, the preparation method of the shell may further include the steps of silk-screening logo, forming an optical coating layer and a protective film layer.

As shown in fig. 3, the third embodiment of the present application further provides an electronic device 300, where the electronic device 300 includes the housing 100 according to the first embodiment of the present application.

In some embodiments, the housing 100 may be, for example, a battery rear cover of the electronic device 300, and the UV transfer layer 20 is closer to an inner wall of the battery rear cover than the substrate layer 10.

In some embodiments, the electronic device 300 is a portable, mobile computing device, wearable device, etc., such as a smartphone, laptop, tablet, gaming device, etc.

The UV transfer layer and the housing of the present invention will be described with reference to specific embodiments.

Example 1

Providing UV glue, and coating the UV glue on the transfer printing template; providing an optical film, transferring the UV glue to one side surface of the optical film, and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 30 parts of a 6-functional urethane acrylate prepolymer, 12 parts of a 2-functional urethane acrylate prepolymer and 13 parts of a 3-functional polyester acrylate prepolymer, 10 parts of NVP, 12 parts of DPGDA, 20 parts of DMAA, 1.5 parts of IRGACURE184J and 1.5 parts of LUCIRIN TPO.

The transfer releasability and adhesion of the UV transfer layer in example 1 were examined.

Example 2

Providing UV glue, and coating the UV glue on the transfer printing template; providing an optical film, transferring the UV glue to one side surface of the optical film, and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 25 parts of 9 functional urethane acrylate prepolymer, 15 parts of 3 functional urethane acrylate prepolymer and 15 parts of 3 functional polyester acrylate prepolymer, 10 parts NVP, 12 parts DPGDA, 20 parts DMAA, 1.5 parts IRGACURE184J and 1.5 parts LUCIRIN TPO.

The transfer releasability and adhesion of the UV transfer layer in example 2 were examined.

Example 3

Providing a substrate layer; forming an optical film layer on the surface of the substrate layer; providing UV glue, coating the UV glue on a transfer printing template, then transferring the UV glue to one side surface of the optical membrane and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 30 parts of a 6-functional urethane acrylate prepolymer, 12 parts of a 2-functional urethane acrylate prepolymer and 13 parts of a 3-functional polyester acrylate prepolymer, 10 parts of NVP, 12 parts of DPGDA, 20 parts of DMAA, 1.5 parts of IRGACURE184J and 1.5 parts of LUCIRIN TPO.

The adhesion of the UV transfer layer of the sample prepared in example 3 and the ring test resistance reliability of the sample were measured, and the measurement items of the ring test reliability include ultraviolet ray aging, high temperature and high humidity, salt spray test, high temperature storage, low temperature storage, cold and hot shock, boiling in water, cosmetic resistance, and artificial sweat.

Example 4

Providing a substrate layer; forming an optical film layer on the surface of the substrate layer; providing UV glue, coating the UV glue on a transfer printing template, then transferring the UV glue to one side surface of the optical membrane and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 25 parts of 9 functional urethane acrylate prepolymer, 15 parts of 3 functional urethane acrylate prepolymer and 20 parts of 3 functional polyester acrylate prepolymer, 10 parts NVP, 12 parts DPGDA, 20 parts DMAA, 1.5 parts IRGACURE184J and 1.5 parts LUCIRIN TPO.

The adhesion of the UV transfer layer of the sample prepared in example 4 and the ring test resistance reliability of the sample were measured, and the measurement items of the ring test reliability include ultraviolet ray aging, high temperature and high humidity, salt spray test, high temperature storage, low temperature storage, cold and hot shock, boiling in water, cosmetic resistance, and artificial sweat.

Comparative example 1

Providing UV glue, and coating the UV glue on the transfer printing template; providing an optical film, transferring the UV glue to one side surface of the optical film, and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 30 parts of a 6 functionality urethane acrylate prepolymer, 25 parts of a 2 functionality urethane acrylate prepolymer, 10 parts of NVP, 12 parts of DPGDA, 20 parts of DMAA, 1.5 parts of IRGACURE184J, and 1.5 parts of LUCIRIN TPO.

The transfer releasability and adhesion of the UV transfer layer in comparative example 1 were examined.

Comparative example 2

Providing UV glue, and coating the UV glue on the transfer printing template; providing an optical film, transferring the UV glue to one side surface of the optical film, and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 25 parts of a 2-functional urethane acrylate prepolymer, 30 parts of a 3-functional polyester acrylate prepolymer, 10 parts of NVP, 12 parts of DPGDA, 20 parts of DMAA, 1.5 parts of IRGACURE184J, and 1.5 parts of LUCIRIN TPO.

The transfer releasability and adhesion of the UV transfer layer in comparative example 2 were examined.

Comparative example 3

Providing a substrate layer; forming an optical film layer on the surface of the substrate layer; providing UV glue, coating the UV glue on a transfer printing template, then transferring the UV glue to one side surface of the optical membrane and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 30 parts of a 6 functionality urethane acrylate prepolymer, 25 parts of a 2 functionality urethane acrylate prepolymer, 10 parts of NVP, 12 parts of DPGDA, 20 parts of DMAA, 1.5 parts of IRGACURE184J, and 1.5 parts of LUCIRIN TPO.

And (3) detecting the adhesive force of the UV transfer printing layer of the sample prepared in the comparative example 3 and the ring test resistance reliability of the sample, wherein detection items of the ring test reliability comprise ultraviolet ray aging, high temperature and high humidity, salt spray test, high temperature storage, low temperature storage, cold and hot shock, water boiling, cosmetics resistance and artificial sweat.

Comparative example 4

Providing a substrate layer; forming an optical film layer on the surface of the substrate layer; providing UV glue, coating the UV glue on a transfer printing template, then transferring the UV glue to one side surface of the optical membrane and curing to form a UV transfer printing layer; wherein, the UV glue comprises the following components: 25 parts of a 2-functional urethane acrylate prepolymer, 30 parts of a 3-functional polyester acrylate prepolymer, 10 parts of NVP, 12 parts of DPGDA, 20 parts of DMAA, 1.5 parts of IRGACURE184J, and 1.5 parts of LUCIRIN TPO.

And (3) detecting the adhesive force of the UV transfer printing layer of the sample prepared in the comparative example 4 and the ring test resistance reliability of the sample, wherein detection items of the ring test reliability comprise ultraviolet ray aging, high temperature and high humidity, salt spray test, high temperature storage, low temperature storage, cold and hot shock, water boiling, cosmetics resistance and artificial sweat.

The detection results are shown in the following table:

TABLE 1

The test method of the strippability is to observe whether the UV adhesive is remained on the template after transfer printing; the test method of the adhesive force is a hundred-grid test; the test methods of ultraviolet aging, high temperature and high humidity, salt spray test, high temperature storage, low temperature storage, cold and hot shock, water boiling, cosmetics resistance and artificial sweat refer to the national reliability test standard.

Comparing examples 1 and 3 with comparative examples 1 and 3, it can be seen that the adhesion of the UV transfer layer formed without adding the polyester acrylic prepolymer is 4B, the adhesion of the UV transfer layer formed with adding the polyester acrylic prepolymer is 5B, the adhesion of the UV transfer layer formed without adding the polyester acrylic prepolymer is poor, the loop test reliability of the sample of the UV transfer layer formed with adding the polyester acrylic prepolymer is all passed, the loop test reliability of the sample of the UV transfer layer formed without adding the polyester acrylic prepolymer is high temperature and high humidity and boiling test is not passed, and the loop test reliability of the sample of the UV transfer layer formed with adding no polyester acrylic prepolymer is also poor; comparing examples 2 and 4 with comparative examples 2 and 4, it can be seen that the transfer peeling of the UV transfer layer formed without the 6-functional urethane acrylate prepolymer was left, the transfer peeling of the UV transfer layer formed with the 6-functional urethane acrylate prepolymer was not left, the transfer performance of the UV transfer layer formed without the 6-functional urethane acrylate prepolymer was poor, the loop measurement reliability of the sample of the UV transfer layer formed with the 6-functional urethane acrylate prepolymer was all passed, the high humidity and boiling test in the loop measurement reliability of the sample of the UV transfer layer formed without the 6-functional urethane acrylate prepolymer was not passed, and the loop measurement reliability of the sample of the UV transfer layer formed with the 2-functional urethane acrylate prepolymer was also poor.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A housing, comprising:

a substrate layer;

the optical film layer is formed on one side surface of the substrate layer; and

the UV transfer printing layer is formed on the surface of one side, far away from the base material layer, of the optical film layer; the UV transfer printing layer is prepared from the following raw materials:

40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; wherein the urethane acrylate prepolymer comprises a 6-to 9-functionality urethane acrylate prepolymer and a 2-functionality urethane acrylate prepolymer; the 6-to 9-functionality polyurethane acrylate prepolymer is used for enabling the UV transfer printing layer to be rapidly cured and has good transfer printing performance, and the 2-functionality polyurethane acrylate prepolymer enables the UV transfer printing layer to have good flexibility and good ring measurement reliability;

40 to 60 parts of a diluent; and

a photopolymerization initiator.

2. The housing of claim 1, wherein the urethane acrylate prepolymer of 6 to 9 functionality and the urethane acrylate prepolymer of 2 functionality are both aliphatic urethane acrylate prepolymers.

3. The housing of claim 1 or 2, wherein the polyester acrylate prepolymer is a 2-functionality to 3-functionality polyester acrylate prepolymer.

4. The housing of claim 3, wherein the acrylate prepolymer is a mixture comprising 20 to 30 parts of the urethane acrylate prepolymer of 6 to 9 functionality, 10 to 15 parts of the urethane acrylate prepolymer of 2 functionality, and 10 to 15 parts of the polyester acrylate prepolymer of 2 to 3 functionality.

5. The housing of claim 1, wherein the diluent is an acrylate monomer; the acrylate monomer is one or more of Dimethylacrylamide (DMAA), N-vinyl pyrrolidone (NVP), hexanediol diacrylate (HDDA) and dipropylene glycol diacrylate (DPGDA).

6. The housing according to claim 1, wherein the photopolymerization initiator is contained in an amount of 2 to 4 parts by weight based on the raw material.

7. The casing according to claim 1, wherein the photopolymerization initiator is a phosphine oxide-based substance or a peroxide-based substance; the phosphine oxide is benzoin and benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether and benzoin isopropyl ether, acetophenones such as acetophenone, 2-dimethoxy-2-phenylacetophenone, 2-diethoxy-2-phenylacetophenone and 1, 1-dichloroacetophenone, or acetophenones such as 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butane-1, 2- (dimethylamino) -2- [ (4-methylphenyl) methyl ] -1- [4- (4-morpholino) phenyl ] -1-butane, or anthraquinones such as 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone and 1-chloroanthraquinone, or thioxanthones such as 2, 4-dimethylthioxanthone, 2, 4-diethylthioxanthone, 2-chlorothioxanthone and 2, 4-diisopropylthioxanthone, or ketals such as acetophenone dimethyl ketal and benzil dimethyl ketal, or benzophenones such as benzophenone, or, xanthone, or one or more of (2, 6-dimethoxybenzoyl) -2, 4, 4-pentylphosphine oxide, bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide, 2, 4, 6-trimethylbenzoyl diphenylphosphine oxide, and ethyl 2, 4, 6-trimethylbenzoyl diphenylphosphinate; the peroxide material is one or more of IRGACURE184, IRGACURE819, IRGACURE907, IRGACURE369, IRGACURE379, IRGACURE389, and LUCIRIN TPO.

8. The housing of claim 1, wherein the UV transfer layer has an adhesion of 5B on the optical film layer.

9. A method of making a housing, comprising:

providing a substrate layer;

forming an optical film layer, wherein the optical film layer is formed on one side surface of the substrate layer;

providing UV glue, forming the UV glue on the surface of one side, far away from the substrate layer, of the optical film layer, and curing to obtain a shell; wherein the UV glue comprises:

40 to 60 parts of an acrylate prepolymer, wherein the acrylate prepolymer is a mixture comprising a polyurethane acrylate prepolymer and a polyester acrylate prepolymer; wherein the urethane acrylate prepolymer comprises a 6-to 9-functionality urethane acrylate prepolymer and a 2-functionality urethane acrylate prepolymer; the 6-9 functionality polyurethane acrylate prepolymer is used for enabling the UV glue to be rapidly cured and has good transfer printing performance, and the 2 functionality polyurethane acrylate prepolymer enables the UV glue to have good flexibility and good ring measurement reliability;

40 to 60 parts of a diluent; and

a photopolymerization initiator.

10. The method of making a housing of claim 9, wherein the polyester acrylate prepolymer is a 2-functionality to 3-functionality polyester acrylate prepolymer.

11. The method of preparing a housing of claim 9, wherein the acrylate prepolymer is a mixture comprising 20 to 30 parts of the polyurethane acrylate prepolymer of 6 to 9 functionalities, 10 to 15 parts of the polyurethane acrylate prepolymer of 2 functionalities, and 10 to 15 parts of the polyester acrylate prepolymer of 2 to 3 functionalities.

12. The method for manufacturing a housing according to claim 9, wherein the UV paste is cured to form a UV transfer layer, and the adhesion of the UV transfer layer to the optical film layer is 5B.

13. An electronic device, characterized in that it comprises a casing according to any one of claims 1 to 8.