Waterproof film preparation method and electronic product

Abstract

The invention provides a waterproof membrane preparation method and an electronic product, and the method comprises the steps: carrying out the mixed reaction of a matrix material and a prefabricated solvent, and forming a matrix solution; adding nano spherical particles into the matrix solution, and carrying out a stirring reaction to form a precursor solution; carrying out forming treatment and heat treatment on the precursor solution to form a film-shaped material; and carrying out preset treatment on the film-like material, and removing the nano spherical particles in the film-like material to form the waterproof film. By utilizing the waterproof membrane, the limitation of a conventional waterproof material can be eliminated, and three-dimensional network holes are formed in the waterproof membrane, so that the waterproof membrane is waterproof and breathable at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof material preparation, and more specifically, to a method for preparing a waterproof membrane. Background Art

[0002] With the progress of society and the development of technology, the size of electronic products such as mobile phones, computers, and wearable devices has continued to decrease in recent years, and people's performance requirements for these portable electronic products have become increasingly higher, which has also put forward higher requirements on the size, performance, and consistency of the electronic parts that match them.

[0003] It can be seen that waterproof function, as a basic requirement for the future development of electronic products such as microphones, also puts forward higher requirements on their performance. At present, the selection of waterproof materials is restricted by various conditions, and the range of optional materials is relatively small. For example, most waterproof membranes need to use fluorine materials, which leads to serious restrictions on their cost and material selection.

[0004] Therefore, there is an urgent need for a waterproof membrane solution that can get rid of the limitations of fluorine materials and ensure effective waterproofing function. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a method for preparing a waterproof membrane and an electronic product to solve the problems of high cost and limited material selection in existing waterproof solutions.

[0006] The method for preparing a waterproof film provided by the present invention comprises: mixing a base material and a prefabricated solvent to form a base solution; adding nano-spherical particles into the base solution for stirring reaction to form a precursor solution; subjecting the precursor solution to molding and heat treatment to form a film-like material; and pre-treating the film-like material to remove the nano-spherical particles in the film-like material to form a waterproof film.

[0007] In addition, an optional technical solution is that the matrix material includes inorganic materials and polymer materials; wherein the inorganic material includes ceramics or carbon materials; the polymer material includes: one or more of polyimide, polyetheretherketone, polyphenylene sulfide, polybenzimidazole, and polysulfone; the carbon material is obtained by carbonizing one or more of polyacrylonitrile, polyimide, polyetheretherketone, and polysulfone. .

[0008] In addition, an optional technical solution is that the process of mixing the matrix material and the prefabricated solvent to form a matrix solution includes: maintaining a preset reaction temperature in a constant temperature water bath, stirring and mixing the matrix material and the prefabricated solvent, and the stirring includes mechanical stirring or magnetic stirring; when the mixing reaction time reaches the preset time, the matrix solution is formed.

[0009] In addition, an optional technical solution is to subject the precursor solution to a molding process and a heat treatment to form a film-like material, comprising: placing the precursor solution on a carrier by electrospinning, scraping or spin coating; and heat treating the precursor solution on the carrier to form the film-like material.

[0010] In addition, an optional technical solution is to pre-treat the film-like material, including: heating the film-like material to decompose the nano-spherical particles in the film-like material by heat; or, using a solvent compatible with the material of the nano-spherical particles to dissolve the nano-spherical particles in the film-like material.

[0011] In addition, an optional technical solution is that the mass fraction of the nano-spherical particles in the precursor solution is in the range of 1 to 20%.

[0012] In addition, an optional technical solution is that the size of the nano-spherical particles is less than 10 nm.

[0013] In addition, an optional technical solution is that the prefabricated solvent includes dimethylformamide or dimethyl sulfoxide.

[0014] In addition, an optional technical solution is that the material of the nano-spherical particles includes one or more of polymethyl methacrylate, polyethylene terephthalate, polystyrene, and polyvinyl chloride.

[0015] On the other hand, the present invention also provides an electronic product, including a substrate, a shell forming a packaging structure with the substrate, and a through hole arranged on the shell or the substrate; a waterproof film is arranged at the through hole, and the waterproof film is prepared by the above-mentioned waterproof film preparation method.

[0016] By utilizing the waterproof film preparation method and electronic products, after obtaining a matrix solution, nano-spherical particles are added to the matrix solution for stirring reaction to form a precursor solution, and then a membrane material is formed based on the precursor solution. After that, by performing relevant preset treatments on the membrane material, the nano-spherical particles in the membrane material can be removed to form a waterproof membrane structure with multiple three-dimensional network holes inside. This can get rid of the limitations of fluorine materials and reduce the manufacturing cost of the waterproof film. The formed waterproof membrane can effectively block foreign matter or liquids while transmitting sound signals through airflow, and can be used in the waterproof design of related electronic products.

[0017] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0019] Figure 1 is a flow chart of a method for preparing a waterproof membrane according to an embodiment of the present invention;

[0020] Figure 2 This is a flow chart of a method for preparing a waterproof membrane according to Embodiment 1 of the present invention;

[0021] Figure 3 The figure is a flow chart of a method for preparing a waterproof membrane according to the second embodiment of the present invention.

[0022] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0023] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0024] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that the term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0026] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0027] In order to describe the waterproof membrane preparation method and the electronic product in the present invention in detail, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Figure 1 The schematic flow chart of the method for preparing a waterproof membrane according to an embodiment of the present invention is shown.

[0029] like Figure 1 As shown, the method for preparing a waterproof membrane according to an embodiment of the present invention comprises the following steps:

[0030] S100: mixing the matrix material and the prefabricated solvent to form a matrix solution.

[0031] Among them, the matrix material may include inorganic materials and polymer materials; among them, the inorganic materials include ceramics or carbon materials, etc.; the polymer materials include: one or more of polyimide, polyetheretherketone, polyphenylene sulfide, polybenzimidazole, polysulfone, etc.; the carbon material can be obtained by carbonizing one or more of polyacrylonitrile, polyimide, polyetheretherketone, polysulfone, etc.

[0032] In addition, the prefabricated solvent can be selected from dimethylformamide (DMF) or dimethyl sulfoxide (DMSO) and other solvents, which can be adaptively selected according to the preparation requirements. The process of mixing the base material and the prefabricated solvent can be completed in a constant temperature water bath.

[0033] As a specific example, the process of mixing a matrix material and a prefabricated solvent to form a matrix solution includes: first, maintaining a preset reaction temperature in a constant temperature water bath, stirring and mixing the matrix material and the prefabricated solvent, and the stirring method may include mechanical stirring or magnetic stirring; when the reaction time reaches the preset time, the matrix solution is formed.

[0034] S200: adding nano-spherical particles into the matrix solution for stirring reaction to form a precursor solution.

[0035] Specifically, since the structure of the pores in the waterproof membrane is related to the density and size of the nano-spherical particles, in order to ensure the waterproof effect and the transmission effect of other signals, such as acoustic signals, the size of the nano-spherical particles can be set to less than 10nm, and the mass fraction range of the nano-spherical particles in the precursor solution can be set to 1-20%. After adding them to the matrix solution, they are fully stirred to make them evenly dispersed, which can ensure the waterproof effect of the waterproof membrane and the transmission effect of sound signals.

[0036] Among them, the material of the nano-spherical particles includes one or more of polymethyl methacrylate, polyethylene terephthalate, polystyrene, polyvinyl chloride, etc. The material of the nano-spherical particles can be selected from a material with a thermal decomposition temperature lower than that of the matrix, or a material that is easily soluble in some solvents, so as to facilitate its subsequent removal from the film material.

[0037] S300: subjecting the precursor solution to molding and heat treatment to form a film-like material.

[0038] Among them, in the process of molding the precursor solution, the precursor solution can be placed on a pre-prepared carrier by electrospinning, scraping or spin coating, and the thickness or size of the molded precursor solution can be adaptively set according to the waterproof requirements; then, the precursor solution on the carrier is heat treated to finally form the desired film material.

[0039] S400: Pre-processing the membrane material to remove the nano-spherical particles in the membrane material to form a waterproof membrane.

[0040] In this step, the process of pre-treating the film material includes: heating the film material to decompose the nano-spherical particles in the film material; or, using a solvent compatible with the material of the nano-spherical particles to dissolve the nano-spherical particles in the film material.

[0041] Among them, according to the material difference between the base material and the nano-spherical particles, a pretreatment operation can be selectively performed, the purpose of which is to remove the nano-spherical particles, thereby forming a waterproof material with a unit network pore structure. The specific shape of the waterproof membrane can be cut and set according to the usage scenario and waterproofing requirements.

[0042] Embodiment 1

[0043] like Figure 2 As shown, in this embodiment, the base material is polyimide, and the nano-spherical particles are polymethyl methacrylate nano-microspheres. The method for preparing the waterproof film includes:

[0044] S101: maintaining the reaction temperature at 0° C. in a constant temperature water bath by mechanical stirring or magnetic stirring, selecting DMF or DMSO as the pre-prepared solvent, using diaminodiphenyl ether and phthalic anhydride as matrix reaction raw materials, stirring the reaction time for 6-8 hours, and forming a matrix solution;

[0045] S102: adding PMMA (polymethyl methacrylate) nano-spherical particles into the matrix solution, and continuing to stir for 1-2 hours to make them evenly dispersed. After the reaction is completed, a uniform and stable polyamic acid solution containing PMMA nano-spherical particles is obtained as a precursor solution;

[0046] S103: preparing the precursor solution into a film material by a material forming method such as an electrospinning method, a scraping method or a spin coating method;

[0047] S104: heat-treating the film material to cause imidization reaction to occur, thereby obtaining a polyimide film material wrapped with nano-spherical particles, wherein the imidization reaction can be performed by thermal imidization or chemical imidization;

[0048] S105: heat-treating the polyimide film material so that the nano-spherical particles therein are decomposed by heat to obtain a polyimide waterproof film having a three-dimensional pore structure therein.

[0049] Embodiment 2

[0050] like Figure 3 As shown, in this embodiment, the base material is polyacrylonitrile, and the nano-spherical particles are silicon dioxide nano-microspheres. The method for preparing the waterproof film includes:

[0051] S201: maintaining a reaction temperature of 60° C. in a constant temperature water bath by mechanical stirring or magnetic stirring, using DMF or DMSO as the pre-made solvent, using polyacrylonitrile as the matrix reaction raw material, and stirring the reaction time for 6-8 hours to form a matrix solution;

[0052] S202: adding silica nano-spherical particles into the matrix solution, and continuing stirring for 1-2 hours to make them evenly dispersed. After the reaction is completed, a uniform and stable polyacrylonitrile solution containing silica nano-spherical particles is obtained as a precursor solution;

[0053] S203: preparing the precursor solution into a film material by a material forming method such as an electrospinning method, a scraping method or a spin coating method;

[0054] S204: heat-treating the film material to cause a carbonization reaction to occur, thereby obtaining a carbon film material wrapped with nano-spherical particles;

[0055] S205: The carbon thin film material is subjected to heat treatment or solvent treatment. For example, NaOH or KOH solution may be used to remove the silicon dioxide nano-spherical particles to obtain a carbon waterproof film having a three-dimensional pore structure inside.

[0056] Corresponding to the above-mentioned waterproof film preparation method, the present invention also provides an electronic product, including a substrate, a shell forming a packaging structure with the substrate, and a through hole arranged on the shell or the substrate; wherein a waterproof film is arranged at the through hole, and the waterproof film is prepared by the above-mentioned waterproof film preparation method.

[0057] Specifically, the electronic product may be a MEMS microphone, a speaker, or other miniature electronic product that needs to be waterproof and transmit signals such as sound.

[0058] It should be noted that the mass fraction or volume size of the nano-spherical particles in the precursor solution will directly affect the size and distribution density of the pores in the waterproof membrane. Therefore, the parameters of the nano-spherical particles can be flexibly set according to the application requirements of the waterproof membrane; in addition, the embodiments of the above-mentioned electronic products can refer to the description in the embodiment of the waterproof membrane preparation method, which will not be repeated here.

[0059] According to the waterproof film preparation method and electronic product of the present invention, a matrix solution is first obtained, and nano-spherical particles are added to the matrix solution for stirring reaction to form a precursor solution. Then, after a membrane material is formed based on the precursor solution, the membrane material is subjected to relevant preset processing to remove the nano-spherical particles in the membrane material, thereby forming a waterproof membrane structure with multiple three-dimensional network holes inside. The density and size of the holes can be flexibly controlled, and it can effectively block foreign matter or liquids while realizing the transmission of signals such as sound through airflow. It can be applicable to the waterproof design of various electronic products.

[0060] The waterproof membrane preparation method and the electronic product according to the present invention are described as examples with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the waterproof membrane preparation method and the electronic product proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A method for preparing a waterproof membrane, characterized in that: include: Mixing the matrix material and the prefabricated solvent to form a matrix solution; Adding nano-spherical particles into the matrix solution for stirring reaction to form a precursor solution; Performing molding and heat treatment on the precursor solution to form a film-like material; The membrane material is pre-processed to remove the nano spherical particles in the membrane material to form a waterproof membrane.

2. The method for preparing a waterproof membrane according to claim 1, characterized in that: The matrix material includes inorganic materials and polymer materials; wherein, The inorganic material includes ceramic or carbon material; The polymer material includes: one or more of polyimide, polyetheretherketone, polyphenylene sulfide, polybenzimidazole, and polysulfone; The carbon material is obtained by carbonizing one or more of polyacrylonitrile, polyimide, polyetheretherketone and polysulfone.

3. The method for preparing a waterproof membrane according to claim 1, characterized in that: The process of mixing the matrix material and the prefabricated solvent to form a matrix solution includes: Maintaining a preset reaction temperature in a constant temperature water bath, stirring and mixing the base material and the prefabricated solvent for reaction, wherein the stirring includes mechanical stirring or magnetic stirring; When the mixing reaction time reaches the preset time, the matrix solution is formed.

4. The method for preparing a waterproof membrane according to claim 1, characterized in that: The process of subjecting the precursor solution to molding and heat treatment to form a film-like material includes: The precursor solution is placed on a carrier by electrospinning, scraping or spin coating; The precursor solution on the carrier is heat treated to form the film material.

5. The method for preparing a waterproof membrane according to claim 1, characterized in that: The membrane material is subjected to a preset process, comprising: The film-like material is subjected to a heating treatment to decompose the nano-spherical particles in the film-like material by heat; or, the nano-spherical particles in the film-like material are dissolved by using a solvent compatible with the material of the nano-spherical particles.

6. The method for preparing a waterproof membrane according to claim 1, characterized in that: The mass fraction of the nano-spherical particles in the precursor solution is in the range of 1 to 20%.

7. The method for preparing a waterproof membrane according to claim 1, characterized in that: The size of the nano-spherical particles is less than 10 nm.

8. The method for preparing a waterproof membrane according to claim 1, characterized in that: The pre-made solvent includes dimethylformamide or dimethyl sulfoxide.

9. The method for preparing a waterproof membrane according to claim 1, characterized in that: The material of the nano-spherical particles includes one or more of polymethyl methacrylate, polyethylene terephthalate, polystyrene and polyvinyl chloride.

10. An electronic product, comprising a substrate, a housing forming a packaging structure with the substrate, and a through hole arranged on the housing or the substrate; characterized in that: A waterproof membrane is arranged at the through hole, and the waterproof membrane is prepared by the waterproof membrane preparation method according to any one of claims 1 to 9.

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