CN113337154A

CN113337154A - Ink, and screen assembly and electronic device using same

Info

Publication number: CN113337154A
Application number: CN202011284243.4A
Authority: CN
Inventors: 王晓光; 霍国亮; 刘子建; 臧永强
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-09-03
Also published as: WO2022105412A1

Abstract

The application relates to the technical field of electronic equipment, in particular to ink, a screen assembly using the ink and electronic equipment. The ink comprises the following components in parts by mass: 35-60 parts of epoxy resin, 10-15 parts of carbon black, 20-40 parts of diluent, 0.1-1 part of flatting agent, 0.1-1 part of defoaming agent and 0-10 parts of filler. This application can improve the bonding strength between printing ink and the glue, guarantees the bonding reliability of screen, alleviates the not good problem of screen joint strength that bonding strength between current printing ink and the glue is low to lead to.

Description

Ink, and screen assembly and electronic device using same

Technical Field

The application relates to the technical field of electronic equipment, in particular to ink, a screen assembly using the ink and electronic equipment.

Background

With the continuous development of science and technology, the screen occupation ratio of electronic devices such as mobile phones and the like is continuously improved, and the comprehensive screen becomes one of the current main development trends. Moreover, with the coming of the full screen age of electronic devices such as mobile phones, the requirement of consumers for the screen occupation ratio is higher and higher, which requires that the occupation ratio of opaque areas such as black frame areas at the edge of the mobile phone screen is smaller and smaller, thereby being beneficial to the improvement of the screen occupation ratio.

Currently, a mobile phone screen is generally adhered to a mobile phone center by an adhesive such as reactive polyurethane hot melt, and an area where the screen is adhered to the center is located at the outermost periphery of the entire screen, that is, a black edge portion of the screen. With the higher requirements on the screen ratio, the black edge part of the mobile phone is required to be narrower, which brings a challenge to the adhesion between the mobile phone screen and the middle frame. In the prior art, in order to block light, at least one layer of black ink is generally required to be printed on the periphery of a mobile phone screen, glue on a middle frame is directly contacted with the black ink to form an effective bonding interface, and then the mobile phone screen is fixed on the mobile phone middle frame. In order to ensure the reliability of the bonding of the mobile phone screen, the black ink and the bonding glue are required to have good bonding performance. However, the ink in the prior art still has the problem of low bonding strength with the glue, which affects the bonding reliability of the screen, and needs to be improved.

Disclosure of Invention

The application aims to provide the printing ink, the screen assembly using the printing ink and the electronic equipment, which can improve the bonding strength between the printing ink and glue, ensure the bonding reliability of a screen and relieve or solve at least one of the above mentioned problems to a certain extent.

According to a first aspect of the application, an ink is provided, which comprises the following components in parts by mass:

35-60 parts of epoxy resin, 10-15 parts of carbon black, 20-40 parts of diluent, 0.1-1 part of flatting agent, 0.1-1 part of defoaming agent and 0-10 parts of filler.

The ink of the application can play a role in enhancing the bonding effect through the cooperative matching of the epoxy resin, the carbon black, the diluent, the flatting agent, the defoaming agent and the optional filler, can enable the ink and the glue to have excellent bonding strength, and has good adhesive force on a screen assembly, so that the reliability of bonding between a screen and a complete machine can be ensured.

In one possible implementation mode, the ink comprises the following components in parts by mass:

40-60 parts of epoxy resin, 10-14 parts of carbon black, 25-40 parts of diluent, 0.2-0.8 part of flatting agent, 0.2-0.8 part of defoaming agent and 0.1-10 parts of filler.

50-60 parts of epoxy resin, 10-12 parts of carbon black, 25-30 parts of diluent, 0.2-0.6 part of flatting agent, 0.2-0.6 part of defoaming agent and 0.5-5 parts of filler.

In one possible implementation, the epoxy resin includes at least one of glycidyl ether type epoxy resin, glycidyl ester type epoxy resin, and linear aliphatic type epoxy resin.

In one possible implementation, the number average molecular weight of the epoxy resin is greater than or equal to (≧) 1000;

the epoxy resin includes at least two epoxy resins, the at least two epoxy resins differing in molecular weight.

In one possible implementation, the carbon black has a particle size in the range of 9nm to 17 nm.

In one possible implementation, the diluent comprises one or more of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, or dimethyl phthalate.

In one possible implementation, the filler includes one or more of calcium carbonate, barium sulfate, talc, or magnesium carbonate.

In one possible implementation, the filler comprises calcium carbonate and/or barium sulfate;

the particle size range of the calcium carbonate and/or the barium sulfate is 1-5 mu m.

The leveling agent comprises an organic silicon leveling agent;

the defoamer comprises a silicone defoamer.

According to a second aspect of the present application, there is provided a screen assembly comprising a screen cover and an ink layer, the screen cover comprising an edge region, the ink layer being located at the edge region.

Wherein the ink layer is formed from the ink as described above.

As explained in relation to the ink in the first aspect, the screen assembly is based on the same inventive concept as the ink, and thus has at least all the features and advantages as described in relation to the ink, and the effects of improving the bonding strength between the ink and the glue and ensuring the bonding reliability of the screen can be achieved, which will not be described in detail herein.

According to a third aspect of the present application, there is provided an electronic device comprising a middle frame and a screen assembly, the screen assembly comprising a screen cover and an ink layer, the screen cover comprising an edge region, the ink layer being located at the edge region, wherein the ink layer is formed from the ink as described above;

the middle frame is provided with an adhesive layer and is bonded with the screen cover plate through the adhesive layer and the ink layer.

In one possible implementation, the adhesive layer comprises a reactive polyurethane hot melt adhesive.

The electronic device includes the screen assembly, the screen assembly includes the ink, and it should be noted that, regarding the specific composition, proportion, type, and the like of the ink in the electronic device, reference may be made to the description of the ink aspect of the first aspect, which at least has all the features and advantages of the ink of the first aspect, and no further description is provided herein.

The technical scheme provided by the application can achieve the following beneficial effects:

the ink mainly comprises proper and proper epoxy resin, carbon black, a diluent, a leveling agent, a defoaming agent and optional fillers, wherein the epoxy resin is the main embodiment of the performance of the ink, the epoxy resin can not only exert the basic performances of self adhesion, thermal shock resistance, weather resistance and the like, but also can well form a chemical bond with glue by utilizing the excellent adhesion performance of the epoxy resin, so that the ink and the glue have excellent adhesion performance, and the epoxy resin can coordinate the compatibility of all components in the ink and improve the cooperativity of the whole system. Meanwhile, the carbon black in the ink can be well soaked by the epoxy resin, and good covering and better insulating property of coating can be provided. The rest components such as the thinner, the flatting agent and the like in the printing ink have good compatibility with the epoxy resin, can be used for adjusting the viscosity of a system, enables all components to be uniformly dispersed, and is beneficial to the operation of processes such as coating and the like. Therefore, the printing ink has the advantages that the synergistic cooperation of the epoxy resin, the carbon black, the diluent, the flatting agent, the defoaming agent and the optional filler can play a role in enhancing the bonding effect, the printing ink and the glue have excellent bonding strength, and the screen assembly has good adhesive force, so that the bonding reliability between a screen and a whole machine can be ensured.

The screen assembly and the electronic device have all the characteristics and advantages of the ink, and are not described in detail herein. Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the embodiments of the present application.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

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 of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present application;

FIG. 2 is a schematic diagram of a screen assembly according to an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic view of a screen cover bonded to a center frame according to an exemplary embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating a principle of bonding a screen cover to a middle frame according to an exemplary embodiment of the present application.

Wherein the reference numerals are as follows:

1-a screen assembly;

101-screen cover plate;

102-an ink layer; 1021-a first ink layer; 1022-a second ink seed layer;

2-middle frame;

201-an adhesive layer;

a-ink;

b-glue;

c-diffusion region.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings. It should be understood that the embodiments described are only a few embodiments of the present application, and not all 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.

As a person skilled in the art understands, as the background art is said, as the technology is developed, the screen occupation ratio of the electronic device is continuously increased, the black edge portion of the screen needs to be narrower, and the bonding strength between the screen and the middle frame needs to be ensured on the basis of the narrowing of the black edge portion, so that the good bonding strength between the ink applied to the screen and the glue needs to be obtained. In order to improve the bonding strength between the ink and the glue in the prior art, the adhesion between the ink and the glue is generally improved by continuously improving the dyne value of the cured ink printing, so that the ink components contain a large amount of matte powder, namely fumed silica. Then, although the existing mode of improving the ink surface dyne value by adding the matte powder can increase the wettability of the glue on the ink surface, the mode cannot ensure that an effective chemical bond or a secondary bond is formed between the glue and the ink main body resin, and cannot fundamentally improve the bonding force between the ink and the glue.

Thus, the existing ink, especially the ink applied to the screen assembly in the electronic device, has more or less problems to be improved. In view of this, the technical solution of the embodiment of the present application provides an ink, and a screen assembly and an electronic device using the ink, so as to be able to alleviate the problem that the bonding strength between the existing ink and glue is low, and provide an ink having high bonding property with glue, improve the reliability of the firm connection between the screen and the middle frame, and ensure the bonding reliability of the screen.

In an embodiment, the ink of the present application, and a screen assembly and an electronic device using the same are further described in detail by way of the embodiment with reference to the accompanying drawings. It should be noted that the same reference numerals in the embodiments of the present application denote the same component parts or the same components, and for the same components in the embodiments of the present application, the reference numerals may be given to only one of the components or the components in the drawings, and it should be understood that the reference numerals are also applicable to other similar components or the components.

In order to facilitate understanding of the ink provided in the embodiments of the present application, an application scenario thereof will be described first, and the ink may be applied to a screen assembly, and further may be applied to an electronic device including the screen assembly. By way of example, the electronic device may include, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a car computer, a handheld computer, a multimedia player, a display screen device (e.g., a television), a Personal Digital Assistant (PDA), a wearable device, and other electronic devices with display functions. In addition, the electronic device of the present application is not limited to the above-described device, but may include a newly developed electronic device. The embodiment of the present application is not particularly limited to the specific form of the electronic device.

By way of example and not limitation, in the embodiments of the present application, the electronic device may be a mobile phone. For convenience of description, in the embodiment of the present application, a mobile phone is taken as an example of the electronic device to specifically describe the electronic device. However, those skilled in the art will understand that the principles of the present application may be implemented in any suitably arranged electronic device, i.e., the electronic device is not limited to a cell phone. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

Specifically, referring to fig. 1 to 4, the present application provides an electronic device in some embodiments, the electronic device includes a housing, a screen assembly 1, a main circuit board, and other components. The screen assembly 1 and the housing together form an accommodating space, and other components of the electronic device, such as the main circuit board, can be accommodated and fixed in the accommodating space.

Wherein the housing may have a variety of different configurations. As an alternative embodiment, the housing may comprise a middle frame 2 and a rear cover, and part of the structure of the middle frame 2 is enclosed at the edge of the rear cover. Wherein, the side of the middle frame 2 facing away from the back cover can be used for installing the screen assembly 1, thereby forming the external structure of the electronic device. The outer side of the screen unit 1 has a screen surface for displaying an image picture.

In the embodiments of the present application, the structure of the housing is not particularly limited. For example, in some embodiments, the middle frame 2 and the rear cover may be of a split structure, and the middle frame and the rear cover may be fixedly connected to form a housing, so that the middle frame 2 and the rear cover may be processed and manufactured respectively, which is beneficial to reducing the manufacturing difficulty and facilitating the maintenance or replacement of batteries, memory cards, and the like in the electronic device. In other embodiments, the middle frame 2 and the rear cover may be integrally formed, so as to increase the structural compactness of the electronic device and improve the overall strength.

Wherein, the material of the shell can also have various forms. For example, the housing may be a plastic housing, and the plastic housing may be made of, but not limited to, Polycarbonate (PC), Acrylonitrile Butadiene Styrene (ABS), and other engineering plastics. The housing may also be a metal housing, and the material of the metal housing includes, but is not limited to, metals or alloys such as magnesium alloy, aluminum magnesium alloy, stainless steel, and titanium alloy. In addition, the shell can be a ceramic shell, a glass shell, a shell structure formed by mutually matching metal and plastic, and the like. In the embodiment of the present application, the specific material of the housing is not limited.

According to the embodiment of the present application, the screen assembly 1 may be a display device and an assembly based on an organic light-Emitting Diode (OLED) for displaying, but is not limited thereto, and other manners may also be adopted. For example, the screen unit 1 may be a Display device and a unit that perform Display based on a Liquid Crystal Display (LCD). The screen assembly 1 constitutes a display screen of a mobile phone. It should be understood that, in order to enable interaction between a user and an electronic device, a screen assembly may include a display panel for outputting display content to the user and a touch device for receiving touch events input by the user on the display screen.

The main circuit board, which is located in the electronic device, may be provided with circuitry for the processor, memory and other functions. The memory may be used for storing software programs and modules, and the processor may execute various functional applications and data processing of the mobile terminal by operating the software programs and modules stored in the memory. The memory may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. The embodiments of the present application are not limited to specific structures or types of processors, memories, and the like.

In addition, the electronic device may further include a power supply such as a battery. The battery may be disposed within the housing, such as on the bezel, with electrical connections between the battery and the main circuit board to power the processor, memory, display assembly, and other components within the electronic device.

The electronic device may further include an optical device inside to perform a photographing function of the electronic device or to sense a surrounding environment of the electronic device through optical means. The optical devices disposed on the electronic device may include, but are not limited to, a camera assembly, a proximity light sensor, a structured light projector, an infrared emitter, an infrared sensor, a time of flight (TOF) emitter, a time of flight sensor, and a flashlight. These optical devices may be wholly or partially electrically connected to the processor of the main circuit board and perform corresponding functions under the control of the processor.

In addition, those skilled in the art understand that, in order to provide the required functions for the user, the electronic device may include several devices arranged inside the device, which is not particularly limited in this application, and those skilled in the art may adjust the position or specific structure of each device according to the actual requirement.

Specifically, in the electronic device, the screen assembly comprises a screen cover plate, and the screen cover plate is located on the outermost surface of the screen assembly and can play a role in supporting and protecting. In some embodiments, for a hard screen structure, the screen cover may be made of a high strength transparent material, such as a glass material with a high silica content. In order to improve the surface hardness of the screen cover plate, hardening layers such as aluminum oxide can be plated on the surface of the screen cover plate, so that the surface of the screen cover plate is prevented from being scratched. In other embodiments, for flexible screen structures, the screen cover may be constructed of a material that is capable of flexing.

Generally, in order to cover a specific portion of the screen cover plate to improve the appearance and the aesthetic property of the screen assembly and facilitate connection with the middle frame, a light-impermeable layer, such as an ink layer, may be covered on the inner surface of the screen cover plate. Specifically, in some embodiments, as shown in fig. 1 to 4, an ink layer 102 is disposed on an edge region of an inner surface of the screen cover 101, wherein the ink layer 102 is formed by the ink a provided in the embodiments of the present application. The screen assembly 1 of the embodiment of the application can improve the bonding strength between the ink a and the glue b, and ensure the bonding reliability of the screen cover plate 101.

Specifically, in the step of forming the ink layer 102, the ink may be printed to the edge area of the screen cover 101 by printing, for example, screen printing, so as to form the ink layer 102 on the edge area of the screen cover 101. The ink may be black ink. Therefore, the black ink can prevent the display panel from light leakage to cause heterochromatic color, or the black ink can cover the edge and improve the appearance attractiveness.

Specifically, the ink layer 102 may extend inward from the edge of the screen cover 101 to form a ring structure. It is understood that the screen cover 101 may have a square structure, and the ink layer 102 may have a square ring structure, and is located at an edge region of the inner surface of the screen cover 101. The inner surface of the screen cover 101 may be understood as a surface of the screen cover 101 facing a side of the display panel or the touch display element.

In addition, the screen assembly 1 may further include other components such as a polarizer, an OLED display panel, and the like, which are stacked, and the other components included in the screen assembly are not particularly limited in the embodiments of the present application and will not be described in detail herein.

Specifically, in the electronic device, the housing includes a middle frame 2 and a rear cover, a partial structure of the middle frame 2 is enclosed at an edge of the rear cover, an adhesive layer 201 may be disposed on a side of the middle frame 2 away from the rear cover, and the middle frame 2 and the screen cover plate 101 are respectively bonded through the adhesive layer 201 and the ink layer 102. That is, the ink layer 102 and the adhesive layer 201 are disposed between the screen cover 101 and the middle frame 2, and the screen cover 101 may be fixed to the middle frame 2 through the ink layer 102 and the adhesive layer 201, wherein the adhesive layer 201 may be formed by glue b. Illustratively, one or more layers of the ink layer 102 may be printed on the screen cover 101, and the adhesive layer 201 forms an effective bonding interface with the ink layer 102, thereby fixing the screen cover 101 to the middle frame 2.

The ink layer 102 may be stacked in various ways, for example, a single layer or a plurality of layers. Specifically, in some embodiments, the number of layers of the ink layer 102 may be one or more, that is, the number of layers of the ink layer 102 is equal to or greater than one, and for example, may be one to ten, may be one to eight, one to five, two to three, and the like. Typically, but not by way of limitation, the number of layers of ink layer 102 may be one, may be two, may be three, may be four, may be five, and the like. The specific number of layers of the carbon ink layer is not limited in the embodiment of the invention, and can be regulated and controlled by a person skilled in the art according to actual conditions.

In some embodiments, as shown in fig. 3, the ink layer 102 is two layers, the ink layer 102 includes a first ink layer 1021 and a second ink layer 1022 which are sequentially stacked, the first ink layer 1021 is located at a side close to the screen cover 101, and the second ink layer 1022 is located at a side close to the adhesive layer 201 on the middle frame 2.

In some embodiments, the adhesive layer 201 comprises a Reactive Polyurethane hot melt adhesive, also known as a moisture curing Reactive Polyurethane hot melt adhesive (PUR).

According to the embodiment of the present application, the glue forming the adhesive layer 201 may be PUR, but is not limited thereto, and may be other reactive glue capable of reacting with epoxy resin to form a chemical bond. In the following embodiment of the present application, the ink and the screen assembly provided in the embodiment of the present application are mainly described by taking a material of the adhesive layer as a PUR as an example, but a person skilled in the art can understand that other types of glue may also be used as the glue under the condition that the requirement of the bonding strength between the ink and the glue is met, and the application does not specifically limit this.

As shown in fig. 4, the ink a in the ink layer and the glue b in the adhesive layer undergo a chemical reaction to form a chemical bond, and a diffusion region c between the ink a and the glue b is formed, thereby effectively improving the adhesion performance.

Specifically, in order to guarantee the bonding reliability between screen apron and the center, the printing ink layer need and the center on have excellent adhesion strength between the adhesive linkage to improve the bonding stability between screen apron and the center, this application provides one kind and has high adhesion strength's printing ink with the adhesive linkage. The ink forming the ink layer is explained in detail below.

In some implementations, an ink is provided that includes the following components in parts by mass:

It is noted that, in some cases, the ink may be formed only from the above-mentioned parts by mass of each component. Alternatively, in other cases, other substances such as impurities and the like may be introduced into the ink, and when other substances such as impurities are included in the ink, it is sufficient to ensure that the above components forming the ink are in the respective mass part ratios.

The ink in the embodiment of the application is determined by comprehensively considering the contribution of each component to the comprehensive performance indexes of the ink, such as adhesion, insulation, adhesion, dispersion uniformity and the like, and various performances are balanced through the synergistic cooperation effect of a plurality of components with specific contents, so that the ink material with excellent comprehensive performance is obtained. Therefore, the ink mainly comprises proper and proper amount of epoxy resin, carbon black, diluent, flatting agent, defoaming agent and optional filler, the components have good compatibility and synergistic effect, each component can fully exert the advantages thereof, through the mutual matching and supporting of the functions of all the components and the mutual restriction and matching of the proportions, can achieve the effect of enhancing the bonding effect, particularly the bonding effect between the printing ink and the glue, can ensure excellent bonding strength between the printing ink and the glue, ensures the reliability of screen bonding, has good adhesive force on a screen cover plate, and the raw materials have wide sources, are easy to obtain, have low price, and effectively solve the problems of unreliability or poor bonding effect in the prior art that the bonding force of the ink is improved by improving the dyne value of the ink.

The epoxy resin is a main embodiment of the performance of the ink, namely the epoxy resin is a main body of the ink film, the epoxy resin can not only exert basic performances such as self bonding, thermal shock resistance and weather resistance, but also can well form a chemical bond with glue by utilizing the excellent bonding performance of the epoxy resin, for example, a three-dimensional cross-linking structure can be generated, so that the ink and the glue have excellent bonding performance, and the bonding strength between the ink and the glue can be greatly improved. And the epoxy resin can coordinate the compatibility of all components in the ink and improve the cooperativity of the whole system. In addition, the epoxy resin has strong adhesion so that the prepared ink can be well combined with the screen cover plate. Although the epoxy resin has the advantages, the proportion of the epoxy resin in the ink needs to be proper, and is not easy to be too high or too low, otherwise, the adhesive strength with glue is reduced, the adhesive force is reduced, and the like, and the application requirements cannot be met.

The carbon black is added into the ink, so that the carbon black can be well soaked by epoxy resin, good covering and good insulating property can be provided for coating, the phenomena of sniping, sinking and the like are avoided, and the black chromaticity of the ink after film forming can be improved. The proportion of carbon black in the ink also needs to be appropriate, and is not too high or too low, which may result in failure to meet the application requirements.

The diluent added in the ink can be an inactive diluent which does not react with the epoxy resin and the curing agent. The diluent has good compatibility with epoxy resin, can be used for adjusting the viscosity of a system, enables all components to be uniformly dispersed, improves the cooperativity of the system, and is beneficial to the operation of processes such as coating and the like. In addition, the thinner can also improve the wettability of the ink after film formation and enhance the glossiness. The proportion of the diluent in the ink also needs to be appropriate, and is not too high or too low, which may result in failure to meet the application requirements.

The leveling agent and the defoaming agent are added into the ink, so that the defoaming effect in the ink forming process or after the ink film forming is enhanced, the surface of the ink is flat, smooth and uniform in the film forming process, and the leveling property and uniformity are improved.

The optional filler means that a filler may or may not be added to the ink. When the filler is added into the ink, the connection resistance effect can be exerted, the compatibility with epoxy resin is good, and adverse phenomena such as precipitation and the like can be avoided.

Herein, percentages, ratios, proportions or parts referred to are by mass unless otherwise indicated. The term "part by mass" as used herein means the basic unit of measurement of the mass ratio of the components, and 1 part may represent any unit mass, for example, 1g, 2.68g, 5g, 10g, etc.

"bonding" may also be referred to herein as "bonding" or "bonding," and generally refers to the secure joining of two objects together or the attachment of one object to another.

The recitation of values by ranges is to be understood in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, 35 to 60 parts by mass of the epoxy resin should be understood to include not only the explicitly recited 35 parts and 60 parts, but also individual values within the indicated range, such as 36 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, and the like.

According to the embodiment of the application, the mass part of the epoxy resin is 35-60 parts. Thus, not only can the decrease of the adhesive force of the ink, the decrease of the adhesive strength with the glue, the deterioration of the compatibility of each component in the ink, and the like, which are caused by the excessively low content of the epoxy resin be avoided, but also the increase of the curing time of the ink, the increase of the cost, the deterioration of the compatibility of each component in the ink, and the like, which are caused by the excessively high content of the epoxy resin, can be avoided, and the requirement of the adhesiveness can not be satisfied.

According to the embodiment of the application, the mass part of the carbon black is 10-15 parts; typically, but not by way of limitation, the mass part of the carbon black may be, for example, any value in the range of 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, and any two of these point values. Therefore, the phenomena of agglomeration, difficult dispersion, sinking and the like caused by the fact that the dispersion difficulty of the carbon black is increased in the manufacturing process of the printing ink due to the fact that the content of the carbon black is too high can be avoided, and the phenomena that the covering or the insulating property of the printing ink is reduced due to the fact that the content of the carbon black is too low can be avoided, so that the printing ink cannot meet the insulating property requirement or the appearance quality of a screen assembly is reduced.

According to the embodiment of the application, the mass part of the diluent is 20-40 parts; typically, but not by way of limitation, the mass parts of the diluent may be, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, and any value in the range of any two of these point values. Therefore, the situation that the viscosity of the ink in the manufacturing process is too high due to too high or too low content of the diluent, so that the uniformity of dispersion of all components is poor and the cooperativity of the system is influenced can be avoided, and in addition, the process operation of printing the ink on the screen cover plate is not facilitated due to too high or too low content of the diluent.

According to the embodiment of the application, the mass part of the leveling agent is 0.1-1 part; typically, but not by way of limitation, the mass part of the leveling agent may be, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, and any value in the range of any two of these point values. The mass part of the defoaming agent is 0.1-1; typically, but not by way of limitation, the mass part of the defoaming agent may be, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, and any value in the range of any two of these point values. Therefore, in the range of a proper defoaming agent, bubbles in the ink forming process can be reduced or foams can be prevented from being formed, and the process operation of printing the ink on the screen cover plate is facilitated; within the range of a proper leveling agent, the surface of the printing ink can be flat, smooth and uniform in the drying and film forming process, the surface tension of the printing ink is reduced, and the leveling property and uniformity of the printing ink are improved.

According to the embodiments of the present application, the filler is optional in the ink, that is, the filler may be added to the ink or not. The filler is 0-10 parts by mass; typically, but not by way of limitation, the mass part of the filler may be, for example, any value in the range of 0 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, and any two of these point values. When the filler is added into the ink, the mass part of the filler is not more than 10 parts, so that the connection resistant effect of the filler can be exerted, good compatibility with epoxy resin can be formed, and the phenomena of agglomeration, difficult dispersion, precipitation and the like caused by the increase of the dispersion difficulty of the filler in the manufacturing process of the ink due to the overhigh content of the filler can be avoided.

Under the conditions of the ink system, the ink meets the international environment-friendly standard, has good adhesive force on a screen cover plate such as a glass cover plate, and has excellent adhesive strength with glue such as PUR glue.

In order to further optimize the amount of each component in the ink and promote the synergistic interaction of the components, in some implementations, the ink includes the following components in parts by mass:

In some implementations, the ink includes the following components in parts by mass:

52-58 parts of epoxy resin, 11-12 parts of carbon black, 26-28 parts of diluent, 0.3-0.5 part of flatting agent, 0.3-0.5 part of defoaming agent and 0.8-4 parts of filler.

Through the reasonable adjustment and the optimization of the using amount of each component in the printing ink, the synergistic cooperation effect among the components is fully exerted, the bonding performance is further improved, the bonding strength between the printing ink and the glue is improved, the reliability of screen bonding is ensured, meanwhile, the production cost of the printing ink can be reduced, and the economic benefit of the adhesive is favorably improved.

The specific type of epoxy in the ink can be varied to meet the bond strength requirements between the ink and the glue. Specifically, in some embodiments, the epoxy resin includes at least one of glycidyl ether type epoxy resin, glycidyl ester type epoxy resin, or linear aliphatic type epoxy resin, and particularly includes epoxy resin composed of a mixture of epoxy resins with different molecular weights, so that hardness and toughness of the resin can be ensured.

Specifically, in some implementations, the epoxy resin may be a glycidyl ether epoxy resin, may be a glycidyl ester epoxy resin, may be a linear aliphatic epoxy resin, may be a combination of a glycidyl ether epoxy resin and a glycidyl ester epoxy resin, may be a combination of a glycidyl ester epoxy resin and a linear aliphatic epoxy resin, may be a combination of a glycidyl ether epoxy resin and a linear aliphatic epoxy resin, and may be a combination of a glycidyl ether epoxy resin, a glycidyl ester epoxy resin, and a linear aliphatic epoxy resin. The combination of the epoxy resins or the epoxy resins is more favorable for improving the bonding property.

When two or more of the above epoxy resins are used, the ratio of the glycidyl ether epoxy resin, the glycidyl ester epoxy resin, and the linear aliphatic epoxy resin is not limited, and the average relative molecular weight after mixing may be 1000 or more.

In some implementations, the epoxy resin has a number average molecular weight ≧ 1000; the epoxy resin includes at least two epoxy resins, the at least two epoxy resins differing in molecular weight. That is, the epoxy resin may be formed by combining a plurality of epoxy resins with different molecular weights, and the number average molecular weight of the combined epoxy resin is not less than 1000. Thus, the hardness and toughness of the epoxy resin can be ensured, and the excellent adhesive property of the epoxy resin can be fully exerted.

Exemplary epoxy resins include a first glycidyl ether-based epoxy resin and a second glycidyl ether-based epoxy resin that differ in molecular weight; or the epoxy resin comprises a first glycidyl ether epoxy resin, a second glycidyl ether epoxy resin and a third glycidyl ether epoxy resin with different molecular weights; or, the epoxy resin comprises glycidyl ether epoxy resin and glycidyl ester epoxy resin with different molecular weights; alternatively, the epoxy resin includes glycidyl ester type epoxy resins and linear aliphatic type epoxy resins, etc., which are different in molecular weight, and they are not listed here.

The specific type of carbon black in the ink can be varied to meet the requirements of the adhesive strength between the ink and the glue. Specifically, in some embodiments, the carbon black may be a specially surface treated high pigment carbon black having good blackness, good dispersibility, and high insulation properties. The carbon black can be formed by mixing one or more high-pigment carbon blacks according to a certain proportion, can provide good coating coverage and optimal insulation, can be well infiltrated by main resin, and does not have the undesirable phenomena of sniping, sinking and the like.

Specifically, in some implementations, the carbon black has a particle size in the range of 9nm to 17nm, and typically, but not by way of limitation, the carbon black may have a particle size of, for example, 9nm, 10nm, 11nm, 12nm, 13nm, 14nm, 15nm, 16nm, 17nm, and any value in the range of any two of these points. The particle size of the carbon black can influence the surface roughness of the formed ink film, so that the particle size of the carbon black is not easy to be too large, the formed ink layer can obtain a smooth surface and has smaller roughness, the improvement of the adhesive force or the bonding performance of the ink is facilitated, the particle size of the carbon black is not easy to be too small, the powder making difficulty can be increased, and the manufacturing cost is increased.

The specific type of the diluent in the ink may be various in order to satisfy the requirements such as the adhesive strength between the ink and the glue. In some implementations, the diluent includes, but is not limited to, one or more of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, or dimethyl phthalate. Further, the diluent can be methyl acetate, ethyl acetate, propyl acetate, butyl acetate, dimethyl phthalate, or a mixture of any two or more of the above esters.

It should be understood that the specific type of the diluent is not limited to the above-mentioned ones, and other types of the diluent, such as other similar ester materials, can be adopted in the case of satisfying the requirements of the adhesive strength between the ink and the glue, and will not be described in detail herein.

The diluent such as ethyl acetate, dimethyl phthalate and the like is adopted, does not react with the epoxy resin and the curing agent, and the viscosity of the system can be adjusted, so that the components are uniformly dispersed, and the cooperativity of the system is improved.

In some implementations, the filler includes one or more of calcium carbonate, barium sulfate, talc, or magnesium carbonate. Further, the filler may be calcium carbonate, barium sulfate, talc, magnesium carbonate, or a mixture of any two or more of the above fillers in any proportion.

It should be understood that the specific type of the filler is not limited to the above-mentioned ones, and other types of the filler, such as aluminum hydroxide, aluminum silicate, etc., may be used in case of satisfying the requirements of the adhesive strength between the ink and the glue, etc., and will not be described in detail herein.

In some implementations, the filler includes calcium carbonate and/or barium sulfate; that is, the filler may be calcium carbonate, may be barium sulfate, and may be a mixture of calcium carbonate and barium sulfate in any proportion.

The calcium carbonate and/or barium sulfate filler is used for improving the viscosity of a system, can exert a connection resistant effect, forms good compatibility with epoxy resin, and does not have the phenomena of poor precipitation such as precipitation and the like.

Specifically, in some implementations, the calcium carbonate and/or barium sulfate has a particle size in a range from 1 μm to 5 μm. Typically, but not by way of limitation, the particle size of the calcium carbonate and/or barium sulfate may be, for example, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, and any value within a range of any two of these values. The particle size of the filler can influence the surface roughness of the ink after film formation, so that the particle size of the filler is not easy to be too large, the ink layer after film formation can obtain a smooth surface and has smaller roughness, the improvement of the adhesive force or the bonding performance of the filler is facilitated, the particle size of the filler is not easy to be too small, the powder making difficulty can be increased, and the manufacturing cost is increased.

The specific types of the defoaming agent and the leveling agent in the ink can be diversified under the condition of meeting the requirements of the bonding strength between the ink and the glue and the like. In some implementations, the leveling agent includes, but is not limited to, a silicone leveling agent. In some implementations, the defoamer includes, but is not limited to, a silicone defoamer.

The above-mentioned leveling agent and defoaming agent may be used those which are conventionally used in the ink field or related fields, such as silicone leveling agents, and defoaming agents such as silicone defoaming agents. The specific types of the leveling agent and the defoaming agent are not limited in the examples of the present application and will not be described in detail herein.

In addition, the specific preparation process of the ink is not limited in the examples of the present application, and the ink can be prepared by a preparation method which is conventional in the art. For example, the raw materials are weighed according to a ratio, a part of the powder raw materials are ground to be within a suitable particle size range, and then the raw materials can be mixed and stirred to obtain the ink.

To fully illustrate the excellent adhesion of the inks provided herein to facilitate an understanding of the present invention, multiple sets of experimental verifications were performed. The present invention will be further described with reference to specific examples and comparative examples. Those skilled in the art will appreciate that only some of the examples described herein are within the scope of the present application and that any other suitable specific examples are within the scope of the present application. In the following examples and comparative examples, reagents, materials and instruments used therefor were commercially available unless otherwise specified.

Example 1

1. Preparation of the inks

According to the mass parts, a mixed solvent of 20 parts of ethyl acetate and 15 parts of butyl acetate is put into a kettle, 39.5 parts of epoxy resin is added, 15 parts of carbon black (MA100) is added, the mixture is dispersed and stirred uniformly, the obtained mixture is ground three times by using a sand mill, the material temperature is controlled not to exceed 40 ℃ in the grinding process, then the material is discharged, 10 parts of calcium carbonate, 0.25 part of organic silicon defoaming agent and 0.25 part of organic silicon flatting agent are added, the material is dispersed and stirred uniformly, the mixture is ground three times by using the sand mill, then the material is discharged and filtered, and the black ink with high adhesion to PUR is obtained.

2. Preparation of Screen Assembly

And (3) placing the black ink on a screen printer, printing on a screen cover plate by adopting a screen with a screen plate of 300 meshes, curing for 10 minutes in a 160 ℃ temperature control tunnel furnace, taking out, and forming an ink layer in the edge area of the screen cover plate to obtain the screen assembly.

The components and amounts thereof in the ink of example 1 are shown in table 1.

Examples 2 to 10

The ink and screen assembly of examples 2-10 were prepared in the same manner as in example 1, and examples 2-10 were different from example 1 in the composition of the ink, and the components and the amounts thereof in the inks of examples 1-10 were as shown in Table 1 below.

Comparative example 1

The printing ink comprises the following components in parts by mass:

30 parts of epoxy resin, 25 parts of carbon black, 20 parts of diluent, 15 parts of matte powder, 5 parts of organic silicon flatting agent and 5 parts of organic silicon defoaming agent.

Comparative example 2

The printing ink comprises the following components in parts by mass:

45 parts of epoxy resin, 20 parts of carbon black, 15 parts of diluent, 12 parts of matte powder, 5 parts of organic silicon flatting agent and 3 parts of organic silicon defoaming agent.

Comparative example 3

The printing ink comprises the following components in parts by mass:

67 parts of epoxy resin, 5 parts of carbon black, 15 parts of diluent, 8 parts of matte powder, 2 parts of organic silicon flatting agent and 3 parts of organic silicon defoaming agent.

Comparative examples 1 to 3 differ from examples 1 to 10 described above in the composition of the ink.

Performance testing

The inks of the above examples and comparative examples were respectively subjected to performance tests, and the test results are shown in table 1 below.

The bonding shear strength between the ink and the PUR adhesive is determined by referring to GB/T7124-2008

TABLE 1 ink compositions and Performance test results in examples and comparative examples

Wherein "-" means not added.

In example 1 and comparative examples 1-3, the diluent comprises 20 parts of ethyl acetate and 15 parts of butyl acetate, and the filler is 10 parts of calcium carbonate.

In example 2, the diluent comprises 20 parts of ethyl acetate and 20 parts of butyl acetate, and the filler is 9 parts of calcium carbonate.

In example 3, the diluent comprises 19 parts of ethyl acetate and 19 parts of butyl acetate, and the filler is 8.9 parts of calcium carbonate.

In example 4, the diluent comprises 18 parts of ethyl acetate and 18 parts of dimethyl phthalate, and the filler is 7.9 parts of barium sulfate.

In example 5, the diluent comprises 18 parts of ethyl acetate and 17 parts of dimethyl phthalate, and the filler is 5.5 parts of barium sulfate.

In example 6, the diluent comprises 31 parts of ethyl acetate and the filler comprises 6.7 parts of calcium carbonate and barium sulfate.

In example 7, the diluent comprises 28 parts of butyl acetate and the filler comprises 8.8 parts of calcium carbonate and barium sulfate.

In example 8, the diluent comprises 13 parts of propyl acetate and 12 parts of butyl acetate, and the filler is 8.5 parts of talcum powder.

In example 9, the diluent comprises 10 parts of ethyl acetate and 10 parts of butyl acetate, and the filler is 8.5 parts of talcum powder.

In example 10, the diluent comprises 10 parts of ethyl acetate and 19.8 parts of butyl acetate, and the filler is 9.6 parts of calcium carbonate.

As can be seen from the data in Table 1 above, the bonding shear strength of the inks provided in examples 1 to 10 of the present application to the PUR paste is significantly higher than that of the inks provided in comparative examples 1 to 3, indicating that the inks provided in the present application have more excellent bonding properties.

It should be noted that the term "and/or"/"used herein is only one kind of association relationship describing associated objects, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

In the description of the present application, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships and are used only for indicating relative positional relationships, and when the absolute position of a described object is changed, the relative positional relationships may be changed accordingly. It will also be understood that when an element such as a layer or substrate is referred to as being "on" or "under" another element, it can be directly on or under the other element or indirectly on or under the other element via intervening elements.

It is noted that a portion of this patent application contains material which is subject to copyright protection. The copyright owner reserves the copyright rights whatsoever, except for making copies of the patent files or recorded patent document contents of the patent office.

Claims

1. The printing ink is characterized by comprising the following components in parts by mass:

2. The ink according to claim 1, characterized by comprising the following components in parts by mass:

3. The ink according to claim 1, characterized by comprising the following components in parts by mass:

4. The ink according to any one of claims 1 to 3, wherein the epoxy resin comprises at least one of a glycidyl ether type epoxy resin, a glycidyl ester type epoxy resin, and a linear aliphatic type epoxy resin.

5. The ink according to claim 4, wherein the epoxy resin has a number average molecular weight of 1000 or more;

6. The ink according to any one of claims 1 to 3, wherein the carbon black has a particle size in the range of 9nm to 17 nm.

7. An ink according to any one of claims 1 to 3 wherein the diluent comprises one or more of methyl acetate, ethyl acetate, propyl acetate, butyl acetate or dimethyl phthalate.

8. An ink according to any one of claims 1 to 3, characterised in that the filler comprises one or more of calcium carbonate, barium sulphate, talc or magnesium carbonate.

9. The ink of claim 8, wherein the filler comprises calcium carbonate and/or barium sulfate;

10. The ink according to any one of claims 1 to 3, wherein the leveling agent comprises an organosilicon leveling agent;

the defoamer comprises a silicone defoamer.

11. A screen assembly comprising a screen cover and an ink layer, the screen cover comprising an edge region, the ink layer being located at the edge region;

wherein the ink layer is formed by the ink of any one of claims 1 to 10.

12. An electronic device comprising a middle frame and a screen assembly, wherein the screen assembly comprises a screen cover plate and an ink layer, the screen cover plate comprises an edge region, the ink layer is positioned at the edge region, and the ink layer is formed by the ink of any one of claims 1-10;

13. The electronic device of claim 12, wherein the adhesive layer comprises a reactive polyurethane hot melt adhesive.