WO2022105412A1

WO2022105412A1 - Ink, screen assembly using same, and electronic device

Info

Publication number: WO2022105412A1
Application number: PCT/CN2021/119622
Authority: WO
Inventors: 王晓光; 霍国亮; 刘子建; 臧永强
Original assignee: 荣耀终端有限公司
Priority date: 2020-11-17
Filing date: 2021-09-22
Publication date: 2022-05-27
Also published as: CN113337154A

Abstract

Ink, a screen assembly using same, and an electronic device. 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 a diluent, 0.1-1 part of a leveling agent, 0.1-1 part of a deforming agent, and 0-10 parts of a filler.

Description

Inks and screen assemblies and electronic devices using the same

This application claims the priority of the Chinese patent application filed on November 17, 2020 with the application number 202011284243.4 and the application title is "ink and screen assembly and electronic device using the same", the entire contents of which are incorporated by reference in in this application.

technical field

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

Background technique

With the continuous development of science and technology, the screen ratio of electronic devices such as mobile phones has been continuously increased, and full screen has become one of the main development trends at present. In addition, with the advent of the era of full-screen electronic devices such as mobile phones, consumers have higher and higher requirements for the screen ratio, which requires that the opaque areas on the edge of the mobile phone screen, such as the black border area, account for a smaller and smaller proportion, and then Helps to increase the screen-to-body ratio.

At present, the mobile phone screen is generally bonded to the middle frame of the mobile phone through an adhesive such as reactive polyurethane hot melt adhesive, and the area where the screen and the middle frame are bonded is located at the outermost periphery of the entire screen, that is, the black edge of the screen. As the requirements for the screen ratio are getting higher and higher, the black borders are required to be narrower and narrower, which brings challenges to the bonding between the mobile phone screen and the middle frame. In the prior art, in order to block light, generally at least one layer of black ink needs to be printed around the screen of the mobile phone. The glue on the middle frame directly contacts the black ink to form an effective bonding interface, and then the screen of the mobile phone is fixed on the middle frame of the mobile phone. In order to ensure the reliability of the bonding of the mobile phone screen, it is necessary to make the black ink and the bonding glue have good bonding properties. However, the ink in the prior art still has the problem of low bonding strength with glue, which affects the bonding reliability of the screen, and needs to be improved.

Application content

The purpose of this application is to provide an ink and a screen assembly and electronic device using the same, which can improve the bonding strength between the ink and the glue, ensure the bonding reliability of the screen, and alleviate or solve the above-mentioned problems to a certain extent. at least one of them.

According to a first aspect of the present application, an ink is provided, comprising 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 leveling agent, 0.1-1 part of defoamer and 0-10 parts of filler.

The ink of the present application can enhance the adhesion through the synergistic coordination of epoxy resin, carbon black, diluent, leveling agent, defoaming agent and optional filler, and can make the ink and glue have excellent adhesion. It also has good adhesion on the screen components, so as to ensure the reliability of the bonding between the screen and the whole machine.

In a possible implementation, the ink includes 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 leveling agent, 0.2-0.8 part of defoamer 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 leveling agent, 0.2-0.6 part of defoamer and 0.5-5 part of filler.

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

In a possible implementation manner, 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, and the molecular weights of the at least two epoxy resins are different.

In a possible implementation manner, the particle size of the carbon black ranges from 9 nm to 17 nm.

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

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

In a possible implementation, the filler includes calcium carbonate and/or barium sulfate;

The particle size of the calcium carbonate and/or barium sulfate ranges from 1 μm to 5 μm.

Described leveling agent comprises silicone leveling agent;

The defoamer includes a silicone defoamer.

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

Wherein, the ink layer is formed of the ink as described above.

As explained in the first aspect of the ink, the screen assembly and the ink are based on the same concept, and therefore at least have all the features and advantages described with the ink, and can improve the bonding strength between the ink and the glue. The effect of the bonding reliability of the screen will not be described in detail here.

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

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

In a possible implementation manner, the adhesive layer includes reactive polyurethane hot melt adhesive.

The electronic device includes the aforementioned screen assembly, and the screen assembly includes the aforementioned ink. It should be noted that, in the electronic device, regarding the specific composition, ratio, type, etc. of the ink, reference may be made to the foregoing description of the ink in the first aspect, It has at least all the features and advantages of the ink in the first aspect, and will not be repeated here.

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

The ink provided by this application is mainly composed of a suitable and appropriate amount of epoxy resin, carbon black, diluent, leveling agent, defoamer and optional filler, wherein the epoxy resin is the main embodiment of the performance of the ink, The epoxy resin can not only exert its own basic properties such as bonding, thermal shock resistance, weather resistance, etc., but also use the excellent bonding properties of the epoxy resin to form a chemical bond with the glue. Excellent adhesive properties, and the epoxy resin can coordinate the compatibility of all components in the ink and improve the synergy of the entire system. At the same time, the carbon black in the ink can be well infiltrated by the epoxy resin, and can also provide good coating coverage and better insulation. The remaining components such as diluent and leveling agent in the ink have good compatibility with epoxy resin, can be used to adjust the viscosity of the system, make each component evenly dispersed, and help the operation of coating and other processes. Therefore, the ink of the present application can enhance the adhesion through the synergistic coordination of epoxy resin, carbon black, diluent, leveling agent, defoamer and optional filler, and can make the ink and glue have excellent adhesion. The adhesive strength of the ink is high, and it has good adhesion on the screen components, so as to ensure the reliability of the bonding between the screen and the whole machine, and the raw materials of the ink are widely sourced, easy to obtain, and low in price, which is conducive to popularization and application.

The screen assembly and electronic device of the present application have all the features and advantages of the ink described above, and will not be repeated here. The remaining aspects and advantages of the present application will be described, shown, or explained in part through the implementation of the embodiments of the present application in the subsequent description.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the application.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments of the present application. For those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

FIG. 1 is a schematic structural diagram of an electronic device provided by an exemplary embodiment of the present application;

FIG. 2 is a schematic structural diagram of a screen assembly provided by an exemplary embodiment of the present application;

3 is a schematic diagram of bonding a screen cover and a middle frame according to an exemplary embodiment of the present application;

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

Among them, the reference numerals are described as follows:

1-screen component;

101-screen cover;

102-ink layer; 1021-first sub-ink layer; 1022-second sub-ink layer;

2- middle frame;

201-adhesive layer;

a-ink;

b- glue;

c-diffusion zone.

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

Detailed ways

In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be clear that the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Those skilled in the art understand that, as mentioned in the background art, with the development of technology and the continuous improvement of the screen ratio of electronic devices, it is necessary to make the black border portion of the screen narrower and narrower, and the black border portion of the screen needs to be narrower and narrower. On the basis of narrowing, it is also necessary to ensure the bonding strength between the screen and the middle frame, so that it is necessary to have good bonding strength between the ink and glue applied to the screen. In the prior art, in order to improve the bonding strength between the ink and the glue, the adhesion between the ink and the glue is generally improved by continuously increasing the dyne value after the ink is printed and cured, so that the ink component will contain a large amount of dumb ink. Powder is also fumed silica. Then, the existing method of increasing the dyne value of the ink surface by adding dummy powder can increase the wettability of the glue on the ink surface, but this method cannot guarantee the formation of an effective chemical bond or secondary price between the glue and the main resin of the ink. key, can not fundamentally improve the adhesion between ink and glue.

Therefore, the existing inks, especially the inks applied to screen components in electronic devices, still have more or less problems and need to be improved. In view of this, the technical solutions of the embodiments of the present application provide an ink and a screen assembly and an electronic device using the same, in order to alleviate the problem of low bonding strength between the existing ink and the glue, and provide a kind of ink with the glue. The high-adhesive ink improves the firmness and reliability of the connection between the screen and the middle frame, and ensures the bonding reliability of the screen.

In a specific embodiment, the ink of the present application and the screen assembly and electronic device using the same will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be noted that the same reference numerals in the embodiments of the present application represent the same component part or the same component, and for the same components in the embodiments of the present application, only one of the components or components may be marked as an example in the drawings. Reference numerals, it should be understood that the same reference numerals apply to other identical parts or components.

In order to facilitate the understanding of the ink provided by the embodiments of the present application, the application scenarios of the ink are first described below. The ink can be applied to a screen assembly, and further can be applied to an electronic device including a screen assembly. Exemplarily, electronic devices may include, but are not limited to, mobile phones, tablet computers, notebook computers, in-vehicle computers, handheld computers, multimedia players, display devices (such as TVs), personal digital assistants (PDAs), wearable Equipment and other electronic equipment with display function. In addition, the electronic device of the present application is not limited to the above-mentioned devices, but may include newly developed electronic devices. The embodiments of the present application do not specifically limit the specific form of the above electronic device.

As an example and not a limitation, in this embodiment of the present application, the electronic device may be a mobile phone. For the convenience of description, the embodiment of the present application specifically describes the electronic device by taking a mobile phone as the above-mentioned electronic device as an example. However, those skilled in the art will understand that the principles of the present application may be implemented in any suitably arranged electronic device, ie the electronic device is not limited to a cell phone. Also, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

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

Therein, the housing can have many different structures. As an optional embodiment, the housing may include a middle frame 2 and a back cover, and a part of the structure of the middle frame 2 is enclosed at the edge of the back cover. Wherein, the side of the middle frame 2 away from the back cover can be used to install the screen assembly 1, so as to form the external structure of the electronic device. The outer side of the screen assembly 1 has a screen surface for displaying an image picture.

It should be noted that, the embodiments of the present application do not specifically limit the structure of the casing. For example, in some embodiments, the middle frame 2 and the back cover may be of a split structure, and after the two are fixedly connected, a casing can be formed, which facilitates the separate processing and manufacture of the middle frame 2 and the back cover, and is conducive to reducing manufacturing costs. Difficulty, convenient maintenance or replacement of batteries, memory cards, etc. in electronic equipment. In other embodiments, the middle frame 2 and the back cover may be integrally formed, which can increase the structural compactness of the electronic device and improve the overall strength.

Wherein, the material of the casing can also have various forms. Exemplarily, the casing may be a plastic casing, and the material of the plastic casing includes but is not limited to polycarbonate (Polycarbonate, PC), acrylonitrile-butadiene-styrene copolymers (Acrylonitrile Butadiene Styrene copolymers, ABS) and other engineering plastics. The shell may also be a metal shell, and the material of the metal shell includes but is not limited to magnesium alloy, aluminum alloy, aluminum-magnesium alloy, stainless steel, titanium alloy and other metals or alloys. In addition, the shell may also be a ceramic shell, a glass shell, or a shell structure in which metal and plastic cooperate with each other. In the embodiment of the present application, the specific material of the casing 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 (Organic Light-Emitting Diode, OLED) for display, but is not limited thereto, and other methods may also be used. For example, the screen assembly 1 may also be a display device and assembly based on a liquid crystal display (Liquid Crystal Display, LCD) for display. The screen assembly 1 constitutes the display screen of the mobile phone. It should be understood that, in order to realize the interactive operation between the user and the electronic device, the screen assembly may include a display panel and a touch control device, wherein the display panel is used for outputting display content to the user, and the touch control device is used for receiving the user's display on the display screen. touch events entered on.

The above-mentioned main circuit board located in the electronic device may be provided with a processor, a memory and other functional circuits. The memory can be used to store software programs and modules, and the processor executes various functional applications and data processing of the mobile terminal by running the software programs and modules stored in the memory. The memory may include high speed random access memory, and may also include nonvolatile 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 do not limit the specific structures or types of devices such as processors and memories.

In addition, the electronic device may also include a power supply such as a battery. The battery can be disposed inside the housing, such as on the middle frame, and there is an electrical connection between the battery and the main circuit board, so as to supply power to the processor, memory, display assembly, and other components in the electronic device.

In order to perform the photographing function of the electronic device, or to sense the surrounding environment of the electronic device through optical means, the electronic device may also include an optical device inside. The optical devices provided on the electronic device may include but are not limited to camera assemblies, proximity light sensors, structured light sensors, structured light projectors, infrared transmitters, infrared sensors, time of flight (TOF) transmitters, Time-of-flight sensors and devices such as flashlights. These optical devices may be in electrical connection with the processor of the main circuit board in whole or in part, and perform corresponding functions under the control of the processor.

In addition, those skilled in the art understand that, in order to provide users with required functions, an electronic device may include several devices arranged inside the device, which is not particularly limited in the present application, and those skilled in the art can adjust the configuration of each device according to actual needs. The location or specific structure can be adjusted.

Specifically, in the electronic device, the screen assembly includes a screen cover plate, and the screen cover plate is located on the outermost surface of the screen assembly, and can play a supporting and protective role. In some embodiments, for the rigid screen structure, the screen cover can 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, the surface of the screen cover may also be plated with a hardened layer such as aluminum oxide, so as to avoid scratches on the surface of the screen cover. In other embodiments, for the flexible screen structure, the screen cover can be made of a material that can be bent.

Generally, in order to cover a specific part of the screen cover to improve the appearance of the screen assembly and facilitate connection with the middle frame, the inner surface of the screen cover can be covered with an opaque layer, such as an ink layer. Specifically, in some embodiments, as shown in FIG. 1 to FIG. 4 , an ink layer 102 is provided on the inner surface edge region 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 present application can achieve the effect of improving the bonding strength between the ink a and the glue b, and ensuring the bonding reliability of the screen cover 101.

Specifically, in the step of forming the ink layer 102 , the ink may be printed on the edge region of the screen cover 101 by printing such as screen printing to form the ink layer 102 on the edge region of the screen cover 101 . Wherein, the ink may be black ink. In this way, the black ink can prevent the display panel from leaking light and cause different colors, or the black ink can play the role of covering the edges and improving the appearance aesthetics.

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

In addition, the screen assembly 1 may also include other components such as polarizers and OLED display panels arranged in layers. The embodiments of the present application do not specifically limit other components included in the screen assembly, and will not be described in detail here.

Specifically, in the electronic device, the housing includes a middle frame 2 and a back cover, a part of the structure of the middle frame 2 is enclosed at the edge of the back cover, and an adhesive layer 201 may be provided on the side of the middle frame 2 away from the back cover, The middle frame 2 and the screen cover 101 are bonded by the adhesive layer 201 and the ink layer 102 respectively. 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 can 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 of glue b. Exemplarily, one or more ink layers 102 may be printed on the screen cover 101 , and the adhesive layer 201 directly forms an effective bonding interface with the ink layer 102 , thereby fixing the screen cover 101 to the middle frame 2 .

The above-mentioned stacking manner of the ink layer 102 can be of various types, for example, a single-layer or multi-layer stacking manner. Specifically, in some embodiments, the number of layers of the ink layer 102 may be one or more layers, that is, the number of layers of the ink layer 102 is greater than or equal to one layer, for example, it may be one to ten layers, or one to eight layers. Layers, one to five layers, two to three layers, etc. Typically, but not limitedly, the number of layers of the ink layer 102 may be one layer, two layers, three layers, four layers, five layers, and the like. The embodiments of the present application do not limit the specific number of layers of the carbon ink layer, which can be regulated by those skilled in the art according to the actual situation.

In some embodiments, as shown in FIG. 3 , the ink layer 102 is two layers, the ink layer 102 includes a first sub-ink layer 1021 and a second sub-ink layer 1022 that are stacked in sequence, and the first sub-ink layer 1021 is located close to the screen cover On one side of the board 101 , the second sub-ink layer 1022 is located near the side of the adhesive layer 201 on the middle frame 2 .

In some embodiments, the adhesive layer 201 includes a reactive polyurethane hot-melt adhesive, also referred to as a moisture-curing reactive polyurethane hot-melt adhesive (Polyurethane Reactive, PUR).

According to the embodiment of the present application, the glue for forming the adhesive layer 201 may be PUR, but it is not limited thereto, and may also be other reactive glues that can react with epoxy resins to form chemical bonds. The following embodiments of the present application mainly take the material of the adhesive layer as PUR as an example to describe the ink and screen components provided in the embodiments of the present application. In the case of strength requirements, other types of glue can also be used for the glue, which is not particularly limited in this application.

As shown in FIG. 4 , the ink a in the ink layer and the glue b in the adhesive layer will undergo a chemical reaction to form a chemical bond, and a diffusion zone c will be formed between the ink a and the glue b. Effectively improve the bonding performance.

Specifically, in order to ensure the bonding reliability between the screen cover and the middle frame, the ink layer needs to have excellent bonding strength with the bonding layer on the middle frame, so as to improve the adhesion between the screen cover and the middle frame. Adhesion stability, the present application provides an ink with high adhesive strength with the adhesive layer. The ink for forming the ink layer will be described in detail below.

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

It should be noted that, in some cases, the ink may be formed by only the above-mentioned components by mass. Or, in other cases, other substances such as impurities may be introduced into the ink. When other substances such as impurities are included in the ink, it is only necessary to ensure that the above-mentioned components forming the ink are within the proportion of each mass fraction.

The inks in the examples of this application are determined by comprehensively considering the contribution of each component to the comprehensive performance indicators of the ink, such as adhesion, insulation, adhesion, dispersion uniformity, etc., through the synergy of the above-mentioned specific content of multiple components The coordination effect balances various properties, and then obtains ink materials with excellent comprehensive properties. Therefore, the ink formed mainly by suitable and appropriate amounts of epoxy resin, carbon black, diluent, leveling agent, defoamer and optional filler has good compatibility and synergistic effect between the components. It can give full play to its own advantages. Through the mutual cooperation and support of the functions of each component, as well as the mutual restriction and matching between the proportions, the effect of enhancing the bonding effect, especially the bonding effect between ink and glue, can be achieved. It can make the ink and glue have excellent bonding strength, ensure the reliability of screen bonding, and have good adhesion on the screen cover, and the raw materials are widely sourced, easy to obtain, and low price, which effectively avoids the need for The method used in the prior art to increase the ink dyne value to improve the adhesive force of the ink has the problem of unreliability or poor adhesive effect.

Among them, epoxy resin is the main embodiment of the performance of the ink, that is, the epoxy resin is the main body of the ink film formation. The excellent bonding properties of epoxy resin can form chemical bonds with glue well, for example, it can produce a three-dimensional cross-linked structure, which in turn makes the ink and glue have excellent bonding properties, which can make the bonding between ink and glue. The strength has been greatly improved. Moreover, the epoxy resin can coordinate the compatibility of all components in the ink and improve the synergy of the whole system. In addition, the epoxy resin has strong adhesion, so that the produced ink can be well combined with the screen cover. Although epoxy resin has the above advantages, the proportion of epoxy resin in the ink needs to be appropriate, and it is not easy to be too high or too low, otherwise it will reduce the bonding strength with the glue, reduce the adhesion, etc., and cannot meet the application requirements.

Among them, carbon black is added to the ink, carbon black can be well infiltrated by epoxy resin, and can also provide good coating coverage and better insulation. Black chroma after film. The proportion of carbon black in the ink also needs to be appropriate, and it is not easy to be too high or too low, otherwise it may lead to failure to meet the application requirements.

Wherein, the diluent added in the ink can be a non-reactive diluent, and the diluent does not react with epoxy resin and curing agent. The diluent has good compatibility with epoxy resin, can be used to adjust the viscosity of the system, disperse each component evenly, improve the synergy of the system, and help the operation of coating and other processes. In addition, the diluent can also improve the wettability of the ink after film formation and enhance the gloss. The proportion of diluent in the ink also needs to be appropriate, and it is not easy to be too high or too low, otherwise it may lead to failure to meet the application requirements.

Among them, adding a leveling agent and a defoamer to the ink can be used to enhance the defoaming effect during the ink forming process or after the ink film is formed, so that the surface of the ink is smooth, smooth and uniform during the film forming process, and the leveling property is improved. and uniformity.

In addition, the above-mentioned optional filler means that the filler may or may not be added to the ink. When the filler is added to the ink, it can exert the effect of resistance to connection, and has good compatibility with epoxy resin, and there will be no adverse phenomena such as precipitation.

Herein, references to percentages, ratios, ratios or parts are by mass unless otherwise indicated. Among them, "mass part" refers to the basic measurement unit of the mass ratio relationship of multiple components, and 1 part can represent any unit mass, such as 1g, 2.68g, or 5g, which can be expressed as 10g, etc.

Herein, "bonding" may also be referred to as "bonding" or "bonding", and mainly refers to firmly connecting two objects together, or attaching one object to another.

Values expressed in ranges should be flexibly understood to include not only the values expressly recited as the limits of the range, but also all individual values or subranges subsumed within the range, as if each value and subrange were expressly recited. out. For example, the mass parts of epoxy resin are 35 to 60 parts, which should be understood to include not only 35 parts and 60 parts explicitly listed, but also individual values within the indicated range, such as 36 parts, 38 parts, 40 parts, 42 parts servings, 45 servings, 48 servings, 50 servings, 52 servings, 55 servings, 58 servings, 60 servings, etc.

According to the embodiments of the present application, the mass parts of the above epoxy resin are 35-60 parts. In this way, not only can the content of epoxy resin be too low to reduce the adhesion of the ink, the bonding strength with glue is reduced, the compatibility of each component in the ink is deteriorated, etc., but also the content of epoxy resin can be avoided. If it is too high, the curing time of the ink will increase, the cost will increase, the compatibility of each component in the ink will deteriorate, etc., and the adhesiveness requirements cannot be met.

According to the embodiments of the present application, the mass parts of the above carbon black are 10 to 15 parts; typical but not limiting, the mass parts of carbon black can be, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts and any value in the range formed by any two of these point values. In this way, it can be avoided that the content of carbon black is too high, which makes the dispersion of carbon black more difficult during the production process, resulting in agglomeration, not easy to disperse, and sinking. The cover or insulation is reduced, resulting in the ink not meeting the insulation requirements or reducing the appearance quality of the screen components.

According to the embodiments of the present application, the mass parts of the above diluent are 20 to 40 parts; typically but not limitedly, 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. In this way, it can be avoided that the content of the diluent is too high or too low, and the viscosity of the ink system during the production process is too high, resulting in poor uniformity of the dispersion of each component and affecting the synergy of the system. In addition, the content of the diluent Too high or too low is not conducive to the process operation of printing ink on the screen cover.

According to the embodiments of the present application, the mass part of the above-mentioned leveling agent is 0.1 to 1 part; typical but not limiting, 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 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, and any value in the range of any two of these point values. The mass part of the above defoaming agent is 0.1 to 1 part; typical but non-limiting, the mass part of the defoaming agent can 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 parts, 0.9 parts, 1 part, and any value in the range of any two of these point values. In this way, within the range of a suitable defoamer, it can reduce the bubbles in the ink formation process or prevent the formation of foam, which is beneficial to the process operation of printing the ink on the screen cover; within the range of a suitable leveling agent, it can make In the process of drying and film formation, the ink surface is flat, smooth and uniform, which helps to reduce the surface tension of the ink and improve its leveling and uniformity.

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 the filler may not be added. The mass parts of the above-mentioned fillers are 0-10 parts; typical but non-limiting, the mass parts of the fillers can be, for example, 0 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts parts, 9 parts, 10 parts, and any value in the range of any two of these point values. When the filler is added to the ink, and the mass fraction of the filler is not more than 10 parts, the connection resistance effect of the filler can be exerted, good compatibility with epoxy resin can be formed, and the ink can be prevented from being too high due to the content of the filler. During the production process, the dispersion difficulty of the filler increases, and the phenomenon of agglomeration, not easy to disperse, and precipitation occurs.

Under the conditions of the above ink system, it complies with international environmental friendly standards, and has good adhesion on screen cover plates such as glass cover plates, and has excellent bonding strength with glues such as PUR glue.

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

In some implementations, the ink includes the following components 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 leveling agent, 0.3-0.5 part of defoamer and 0.8-4 parts of filler.

By rationally adjusting and optimizing the amount of each component in the ink, the synergistic effect between the components can be fully exerted to further improve the bonding performance, improve the bonding strength between the ink and the glue, and ensure the reliability of screen bonding. At the same time, the production cost of the ink can be reduced, and the economic benefit of the adhesive can be improved.

The specific types of epoxy resins in the inks can be varied under the condition that the adhesive strength requirements between the inks and the glue are met. Specifically, in some embodiments, the epoxy resin comprises at least one of glycidyl ether epoxy resin, glycidyl ester epoxy resin or linear aliphatic epoxy resin, especially comprising different molecular weights The epoxy resin is mixed with epoxy resin, which can ensure the hardness and toughness of the resin.

Specifically, in some implementations, the epoxy resin may be a glycidyl ether epoxy resin, a glycidyl ester epoxy resin, a linear aliphatic epoxy resin, or a glycidyl ether epoxy resin The combination of epoxy resin and glycidyl ester epoxy resin can be a combination of glycidyl ester epoxy resin and linear aliphatic epoxy resin, which can be glycidyl ether epoxy resin and linear aliphatic epoxy resin The combination of epoxy resins may be a combination of glycidyl ether epoxy resins, glycidyl ester epoxy resins, and linear aliphatic epoxy resins. Using these epoxy resins or a combination of several epoxy resins is more conducive to improving the bonding performance.

It should be pointed out that if two or more types of the above epoxy resins are used as epoxy resins, the glycidyl ether epoxy resins, glycidyl ester epoxy resins, and linear aliphatic epoxy resins will not be affected. The ratio is not limited, and the average relative molecular weight after mixing can be above 1000.

In some implementations, the epoxy resin has a number average molecular weight of ≥1000; the epoxy resin includes at least two epoxy resins, and the molecular weights of the at least two epoxy resins are different. That is, the epoxy resin can be formed by combining various epoxy resins with different molecular weights, and the number average molecular weight of the combined epoxy resin is not less than 1000. In this way, the hardness and toughness of the epoxy resin can be ensured, thereby giving full play to the excellent bonding properties of the epoxy resin.

Exemplarily, the epoxy resin includes a first glycidyl ether epoxy resin and a second glycidyl ether epoxy resin with different molecular weights; or, the epoxy resin includes a first glycidyl ether epoxy resin with different molecular weights, The second glycidyl ether type epoxy resin and the third glycidyl ether type epoxy resin; alternatively, the epoxy resin includes glycidyl ether type epoxy resin and glycidyl ether type epoxy resin with different molecular weights; alternatively, the epoxy resin Including glycidyl ester epoxy resins and linear aliphatic epoxy resins with different molecular weights, etc., and will not be listed one by one here.

The specific types of carbon black in the ink can be varied under the condition that the requirements such as the bonding strength between the ink and the glue are met. Specifically, in some embodiments, the carbon black can be a special surface-treated high-pigment carbon black, which has good blackness, good dispersibility, and high insulating properties. The carbon black can be formed by mixing one or more high-pigment carbon blacks in a certain proportion, which can provide good coating coverage and best insulation, and can be well infiltrated by the main resin without sniping, sinking, etc. unpleasant sight.

Specifically, in some implementations, the particle size of the carbon black ranges from 9 nm to 17 nm. Typical but non-limiting, the particle size of the carbon black can be, for example, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16nm, 17nm, and any value in the range of any two of these point values. The particle size of carbon black will affect the surface roughness after ink film formation. Therefore, the particle size of the carbon black is not easy to be too large, so that the ink layer after film formation can obtain a smooth surface and have a small roughness. , which is conducive to improving the adhesion or bonding performance of the ink, and the particle size of the carbon black is not too small, which will increase the difficulty of milling and increase the manufacturing cost.

The specific types of diluents in the ink can be varied under the condition that the requirements such as the bonding strength between the ink and the glue are met. 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, can be ethyl acetate, can be propyl acetate, can be butyl acetate, can be dimethyl phthalate, can be any two of the above-mentioned esters. A mixture of one or two or more of them in any ratio.

It should be understood that the specific types of diluents are not limited to those listed above, and other types of diluents, such as other similar ester raw materials, can also be used under the condition that the requirements such as the bonding strength between the ink and the glue are met. etc., and will not be described in detail here.

Diluents such as ethyl acetate and dimethyl phthalate are used, which do not react with epoxy resins and curing agents, and can adjust the viscosity of the system, so that the components are dispersed evenly and the synergy 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 can be calcium carbonate, barium sulfate, talc, magnesium carbonate, or a mixture of any two or more of the above-mentioned fillers in any ratio.

It should be understood that the specific types of fillers are not limited to those listed above, and other types of fillers, such as aluminum hydroxide, aluminum silicate, etc. , and will not be described in detail here.

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

The use of calcium carbonate and/or barium sulfate fillers can be used to improve the viscosity of the system, and can also exert the effect of resistance to connection, form good compatibility with epoxy resin, and there will be no undesirable precipitation such as precipitation.

Specifically, in some implementations, the particle size of the calcium carbonate and/or barium sulfate ranges from 1 μm to 5 μm. Typically but not limiting, the particle size of 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 two of these point values Any value in the formed range. The particle size of the filler will affect the surface roughness after the ink is formed into a film. Therefore, the particle size of the filler is not easy to be too large, so that the ink layer after film formation can obtain a smooth surface and have a small roughness. It is beneficial to improve the adhesion or bonding performance of the filler, and the particle size of the filler is not too small, which will increase the difficulty of milling and increase the manufacturing cost.

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

The above-mentioned leveling agent and defoaming agent can be commonly used leveling agents in the ink field or related fields, such as silicone leveling agents, and defoaming agents such as silicone antifoaming 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 here.

In addition, the examples of the present application do not limit the specific preparation process of the above-mentioned ink, which can be prepared by using a conventional preparation method in the art. Exemplarily, each raw material is weighed according to the proportion, and part of the powder raw material is ground to make it within a suitable particle size range, and then each raw material can be mixed and stirred to obtain the ink.

In order to fully illustrate the excellent adhesion of the ink provided by the present application and facilitate the understanding of the present application, the present application has carried out multiple sets of experimental verifications. The present application will be further described below in conjunction with specific embodiments and comparative examples. Those skilled in the art will understand that the examples described in this application are only some of the examples, and any other suitable specific examples are within the scope of this application. In the following examples and comparative examples, the reagents, materials and instruments used are commercially available unless otherwise specified.

Example 1

1. Preparation of ink

In parts by mass, put a mixed solvent of 20 parts of ethyl acetate and 15 parts of butyl acetate into the kettle, add 39.5 parts of epoxy resin, add 15 parts of carbon black (MA100), disperse and stir evenly, and use a sand mill for the obtained mixture Grind three times, control the material temperature not to exceed 40 ℃ during the grinding process, and then discharge the material, add 10 parts of calcium carbonate, 0.25 parts of silicone defoamer, 0.25 parts of silicone leveling agent, disperse and stir evenly, and grind three times with a sand mill. Then, the material is discharged and filtered to obtain a black ink with high adhesion to PUR.

2. Preparation of screen components

The above black ink is placed on a screen printing machine, and the screen cover is printed with a 300-mesh screen. After curing in a temperature-controlled tunnel furnace at 160°C for 10 minutes, it is taken out and an ink layer is formed on the edge area of the screen cover. , and then get the screen component.

The components and their amounts in the ink of Example 1 are shown in Table 1.

Examples 2-10

The preparation process of the ink and screen assembly in Example 2-10 is the same as that of Example 1. The difference between Example 2-10 and Example 1 is that the composition of the ink is different. The components and The dosage is shown in Table 1 below.

Comparative Example 1

An ink comprising the following components in parts by mass:

30 parts of epoxy resin, 25 parts of carbon black, 20 parts of thinner, 15 parts of dumb powder, 5 parts of silicone leveling agent, 5 parts of silicone defoamer.

Comparative Example 2

An ink comprising the following components in parts by mass:

45 parts of epoxy resin, 20 parts of carbon black, 15 parts of thinner, 12 parts of dumb powder, 5 parts of silicone leveling agent, 3 parts of silicone defoamer.

Comparative Example 3

An ink comprising the following components in parts by mass:

67 parts of epoxy resin, 5 parts of carbon black, 15 parts of thinner, 8 parts of dumb powder, 2 parts of silicone leveling agent, 3 parts of silicone defoamer.

The difference between Comparative Examples 1-3 and the above-mentioned Examples 1-10 is that the composition of the ink is different.

Performance Testing

Performance tests were performed on the inks of the above-mentioned examples and comparative examples, respectively, and the test results are shown in Table 1 below.

The adhesion shear strength of ink and PUR glue is measured with reference to GB/T 7124-2008

Table 1 Ink composition and performance test results in each embodiment and comparative example

Among them, "-" means not added.

In Example 1 and Comparative Examples 1-3, the diluent included 20 parts of ethyl acetate and 15 parts of butyl acetate, and the filler was 10 parts of calcium carbonate.

In Example 2, the diluent included 20 parts of ethyl acetate and 20 parts of butyl acetate, and the filler was 9 parts of calcium carbonate.

In Example 3, the diluent included 19 parts of ethyl acetate and 19 parts of butyl acetate, and the filler was 8.9 parts of calcium carbonate.

In Example 4, the diluent included 18 parts of ethyl acetate and 18 parts of dimethyl phthalate, and the filler was 7.9 parts of barium sulfate.

In Example 5, the diluent included 18 parts of ethyl acetate and 17 parts of dimethyl phthalate, and the filler was 5.5 parts of barium sulfate.

In Example 6, the diluent included 31 parts of ethyl acetate, and the filler was 6.7 parts of calcium carbonate and barium sulfate.

In Example 7, the diluent included 28 parts of butyl acetate, and the filler was 8.8 parts of calcium carbonate and barium sulfate.

In Example 8, the diluent included 13 parts of propyl acetate and 12 parts of butyl acetate, and the filler was 8.5 parts of talc.

In Example 9, the diluent included 10 parts of ethyl acetate and 10 parts of butyl acetate, and the filler was 8.5 parts of talc.

In Example 10, the diluent included 10 parts of ethyl acetate and 19.8 parts of butyl acetate, and the filler was 9.6 parts of calcium carbonate.

As can be seen from the data in Table 1 above, the adhesive shear strength of the ink and the PUR glue provided by the examples 1-10 of the present application is significantly higher than the adhesive shear strength of the ink and the PUR glue of the comparative example 1-3. The ink provided by the present application has more excellent adhesion properties.

It should be noted that the term "and/or" or "/" used in this document is only an association relationship to describe associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean: exist independently A, there are both A and B, and there are three cases of B alone. As used in the embodiments of this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

As used in this application, "first," "second," and similar words do not denote any order, quantity, or importance, but are merely used to distinguish the various components. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is only used to indicate a relative positional relationship. When the absolute position of the object to be described changes, the relative position Relationships may also change accordingly. It will also be understood that when an element such as a layer or a substrate is referred to as being "on" or "under" another element, it can not only be directly connected "on" or "under" the other element, but also Indirectly connected "on" or "under" another element through intervening elements.

It should be noted that a part of this patent application file contains content protected by copyright. Except for making copies of the patent files of the Patent Office or the contents of the recorded patent files, the copyright owner reserves the right to copyright.

Claims

A kind of ink is characterized in that, 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 leveling agent, 0.1-1 part of defoamer and 0-10 parts of filler.
ink according to claim 1, is characterized in that, comprises the component of following mass fraction:

40-60 parts of epoxy resin, 10-14 parts of carbon black, 25-40 parts of diluent, 0.2-0.8 part of leveling agent, 0.2-0.8 part of defoamer and 0.1-10 parts of filler.
ink according to claim 1, is characterized in that, comprises the component of following mass fraction:

50-60 parts of epoxy resin, 10-12 parts of carbon black, 25-30 parts of diluent, 0.2-0.6 part of leveling agent, 0.2-0.6 part of defoamer and 0.5-5 part of filler.
The ink according to any one of claims 1 to 3, wherein the epoxy resin comprises glycidyl ether epoxy resin, glycidyl ester epoxy resin, and linear aliphatic epoxy resin. at least one.
The ink according to claim 4, wherein 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, and the molecular weights of the at least two epoxy resins are different.
The ink according to any one of claims 1 to 3, wherein the particle size of the carbon black ranges from 9 nm to 17 nm.
The ink according to any one of claims 1 to 3, wherein the diluent comprises one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate or dimethyl phthalate or more.
The ink according to any one of claims 1 to 3, wherein the filler comprises one or more of calcium carbonate, barium sulfate, talc or magnesium carbonate.
The ink according to claim 8, wherein the filler comprises calcium carbonate and/or barium sulfate;

The particle size of the calcium carbonate and/or barium sulfate ranges from 1 μm to 5 μm.
The ink according to any one of claims 1 to 3, wherein the leveling agent comprises a silicone leveling agent;

The defoamer includes a silicone defoamer.
A screen assembly, characterized in that it comprises a screen cover plate and an ink layer, the screen cover plate includes an edge region, and the ink layer is located in the edge region;

The ink layer is formed of the ink according to any one of claims 1 to 10.
An electronic device, comprising a middle frame and a screen assembly, characterized in that the screen assembly includes a screen cover plate and an ink layer, the screen cover plate includes an edge region, and the ink layer is located in the edge region, wherein the The ink layer is formed of the ink according to any one of claims 1 to 10;

The middle frame is provided with an adhesive layer, and the middle frame is bonded to the screen cover through the adhesive layer and the ink layer.
The electronic device according to claim 12, wherein the adhesive layer comprises reactive polyurethane hot melt adhesive.