WO2022022533A1

WO2022022533A1 - Coating structures and preparation method therefor, material article, and electronic product

Info

Publication number: WO2022022533A1
Application number: PCT/CN2021/108746
Authority: WO
Inventors: 杨伟; 邹凌云; 陈志斌; 吴献明; 阮三良
Original assignee: 深圳市万普拉斯科技有限公司
Priority date: 2020-07-30
Filing date: 2021-07-27
Publication date: 2022-02-03
Also published as: CN114054317A

Abstract

Provided are a coating structure and a preparation method therefor, and a material article and an electronic product comprising the coating structure. The coating structure comprises an NCVM primer layer (10), an NCVM coating layer (30), a first transparent protective layer (50), an optical brightening film layer (70), and a second transparent protective layer (90), which are sequentially stacked on the surface of a substrate.

Description

Coating structure and preparation method thereof, material product and electronic product

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202010751963.0 and the application date of July 30, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The embodiments of the present application relate to the technical field of material processing, and in particular, to a coating structure and a method for preparing the same, material products and electronic devices including the coating structure.

Background technique

With the continuous progress of production technology and the improvement of people's personalized requirements for electronic products, in addition to the hardware specifications of electronic products, the appearance design of electronic products is also one of the factors affecting user experience. For example, users all hope that the casing used on the mobile phone not only has a beautiful appearance, but also has the advantages of wear resistance, drop resistance, and corrosion resistance.

In the related art, in order to maintain the durability and wear resistance of the optical coating layer, the commonly used brightening process is done on the inner surface of the substrate, and at the same time, the outer surface of the substrate is hardened or coated with a layer of AF coating. . Because the optical coating layer is located on the inner surface of the substrate, it will damage the overall appearance of the substrate to a certain extent, and it is difficult to meet the decorative requirements of high-end mobile phones.

SUMMARY OF THE INVENTION

The main technical problem solved by the embodiments of the present application is to provide a coating structure and a preparation method thereof, material products and electronic products using the coating structure, which can present a good ceramic texture and improve its durability and wear resistance. performance.

In order to achieve the above purpose, a technical solution adopted in the embodiments of the present application is: firstly, a coating structure is provided, comprising an NCVM primer layer, an NCVM coating layer, and a first transparent protective layer sequentially stacked on the surface of the substrate , an optical brightness enhancement film layer and a second transparent protective layer.

Optionally, the NCVM coating layer is an indium layer;

The optical brightness enhancement film layer includes a metal oxide layer, and the metal oxide in the metal oxide layer is selected from at least one of Ti ₂ O ₅ , ZrO ₂ , and SiO ₂ .

Optionally, the thickness of the indium layer is 3-20 nm;

The thickness of the metal oxide layer is 30-200 nm.

Optionally, the first transparent protective layer is a low-molecular-weight UV-curable hard coating;

The thickness of the first transparent protective layer is 15-25 μm.

Optionally, the second transparent protective layer is a modified organosilicon coating, and the modified organosilicon coating includes a compound whose molecular formula is shown by the following chemical structural formula:

where -SiOR represents siloxy;

The thickness of the modified silicone coating is 3-15 μm.

In some embodiments, the coating structure further comprises a primer layer and a color paint layer sequentially laminated on the surface of the substrate, and the NCVM primer layer is laminated on the color paint layer;

Wherein, before the color paint layer is laminated on the primer layer, the thickness of the primer layer is partially removed by grinding.

In some embodiments, the primer layer includes a first primer layer, a second primer layer and a third primer layer, and the color paint layer is laminated on the third primer layer;

The thicknesses of the first primer layer, the second primer layer, the third primer layer and the color paint layer are all 8-15 μm, and the grinding removal amount of the third primer layer is 5-15μm.

In a second aspect, a method for preparing the coating structure as described above is provided, comprising:

The coating is sprayed on the surface of the substrate, and the NCVM primer layer is formed after curing;

forming the NCVM coating layer on the NCVM primer layer by discontinuous coating technology;

forming the first transparent protective layer on the NCVM coating layer;

forming the optical brightness enhancement film layer on the first transparent protective layer through an optical coating process;

The second transparent protective layer is formed on the optical brightness enhancement film layer.

Optionally, the NCVM coating layer is an indium layer;

Optionally, the thickness of the indium layer is 3-20 nm;

The thickness of the metal oxide layer is 30-200 nm.

The thickness of the first transparent protective layer is 15-25 μm.

where -SiOR represents siloxy;

The thickness of the modified silicone coating is 3-15 μm.

In some embodiments, before spraying the coating on the surface of the substrate and forming the NCVM primer layer after curing, the preparation method further includes:

Spray paint on the surface of the substrate to form a primer layer;

sanding the primer layer;

Spray paint on the primer layer to form a paint layer.

In some embodiments, the spraying paint on the surface of the substrate to form a primer layer specifically includes:

Spray paint three times on the surface of the substrate to form a first primer layer, a second primer layer and a third primer layer, the first primer layer, the second primer layer, the third primer layer The thickness of the three primer layers and the color paint layer are both 8-15 μm;

The sanding primer layer specifically includes:

The third primer layer is sanded, and the sanding removal amount of the third primer layer is 5-15 μm.

In a third aspect, an article of material is provided, comprising a substrate, and a coating structure as described above laminated on the surface of the substrate.

In a fourth aspect, an electronic product is provided, including a casing, the casing being made of the above-mentioned material product.

The beneficial effects of the embodiments of the present application are: different from the situation in the prior art, the coating structure of the embodiments of the present application includes an NCVM primer layer, an NCVM coating layer, a first transparent protective layer, an optical The brightness enhancement film layer and the second transparent protective layer can comprehensively improve the transmission and reflection of light by arranging the first transparent protective layer on the NCVM coating layer and the optical brightness enhancement film layer on the first transparent protective layer. It presents a high-bright ceramic texture; at the same time, after part of the optical brightness enhancement coating layer is worn, due to the reflective gloss of the NCVM coating layer, the visual difference between the worn area and the unworn area can be weakened, thereby improving the coating. Durability and wear resistance of the structure.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are denoted as similar elements, Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation.

Fig. 1 is the schematic diagram of the coating structure of the embodiment of the present application;

2 is a schematic diagram of a coating structure according to another embodiment of the present application;

FIG. 3 is a schematic flowchart of a method for preparing a coating structure according to an embodiment of the present application.

detailed description

In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field belonging to this application.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element, or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

Example 1

An embodiment of the present application provides a coating structure applied to the surface of a substrate, please refer to FIG. 1 , the coating structure includes an NCVM primer layer 10 , an NCVM coating layer 30 , a first transparent coating layer 10 , and a first transparent layer sequentially stacked on the surface of the substrate 200 . The protective layer 50 , the optical brightness enhancement film layer 70 and the second transparent protective layer 90 .

NCVM is the abbreviation of English Non conductive vacuum metallization, NCVM, namely discontinuous coating technology or non-conductive electroplating technology, is a high-tech originating from ordinary vacuum electroplating. Organic conversion is carried out by specific means such as metal into particles, which are deposited or adsorbed on the surface of plastic materials, and finally form a coating that has a metallic appearance and does not affect the transmission effect of wireless communication.

Among them, the NCVM primer layer 10, that is, the coating formed by spraying on the surface of the substrate 200 before the NCVM coating layer 30 is formed by the discontinuous coating technology or the non-conductive plating technology, is used to protect the surface of the substrate 200 and to enhance the The thickness of the adhesion of the NCVM coating layer 30 on the surface of the substrate 200 is 10-15 μm to ensure that the NCVM coating layer 30 can be firmly attached to the surface of the substrate 200 . Specifically, the NCVM primer layer 10 may be an ultraviolet curing (Ultraviolet Curing, UV) paint or a polyurethane (Polyurethane, PU) paint.

The NCVM coating layer 30 may be an indium layer, a tin layer, or an aluminum layer, and is used to reflect part of the light, thereby improving the pattern, texture and/or color on the substrate 200 . In one embodiment, the NCVM coating layer 30 is an indium layer, so that the substrate 200 can be applied to electronic products with high requirements for wireless information transmission, for example, applied to the middle frame of a mobile phone; the thickness of the indium layer is preferably 3 -20nm, if the thickness is too thick, the light transmittance will be low, which will affect the appearance expression of the substrate 200 instead.

The first transparent protective layer 50 covers the NCVM coating layer 30 for protecting the NCVM coating layer 30 and can be closely combined with the NCVM primer layer 10 . In some embodiments, the first transparent protective layer 50 is a low-molecular-weight UV-curable hard coating, the raw material of which is mainly composed of a low-molecular-weight photosensitive resin with unsaturated bonds, a photoinitiator, a photocuring agent and a diluent.

Further, the first transparent protective layer 50 also has high hardness and high transparency, for example, its surface hardness is greater than or equal to 4H and transparency is greater than or equal to 85%. Existing low molecular weight UV coatings that satisfy the above hardness and transparency can be used to prepare the first transparent layer. The protective layer 50 (for example, acrylic series UV paint produced by Shenzhen Jiertai Technology can be used).

The reflective gloss of the NCVM coating layer 30 will be lost due to the covering of the first transparent protective layer 50 . Therefore, in this embodiment, an optical brightness enhancement film layer 70 is further laminated on the first transparent protective layer 50 .

Optical coating refers to the process of coating one (or multi-layer) metal (or dielectric) film on the surface of optical parts. The purpose of coating the surface of optical parts is to reduce or increase the reflection, beam splitting and color separation of light. , filter, polarization and other requirements. Commonly used coating methods include vacuum coating (a kind of physical coating) and chemical coating. Vacuum coating is to vaporize the coating material through a specific heating source in a high vacuum environment, and then deposit it on the surface of the substrate to form a transparent layer. Dielectric film to enhance reflection and brightness and improve visibility.

The optical brightness enhancement film layer 70 is a transparent dielectric film formed by an optical coating process. The optical brightness enhancement film layer 70 has a brightness enhancement effect and can make up for the gloss loss caused by the coverage of the first transparent protective layer 50; the optical brightness enhancement film There is also good compatibility between the layer 70 and the first transparent protective layer 50. After the NCVM coating layer 30, the first transparent protective layer 50, and the optical brightness enhancement film layer 70 are superimposed, they can show a better brightness. Ceramic texture.

The thickness of the optical brightness enhancement film layer 70 is 30-200 nm. In some embodiments, the optical brightness enhancement film layer 70 includes a metal oxide layer, and the metal oxide in the metal oxide layer is selected from at least one of Ti ₂ O ₅ , ZrO ₂ , and SiO ₂ , for example, metal oxides The layer is a Ti ₂ O ₅ layer, or a SiO ₂ layer, or a composite layer including a Ti ₂ O ₅ layer and a SiO ₂ layer.

The second transparent protective layer 90 covers the optical brightness enhancement film layer 70 for protecting the optical brightness enhancement film layer 70 and exhibits the ceramic-like effect of the coating structure to the greatest extent. In practical applications, even if part of the second transparent protective layer 90 on the outermost surface is worn away, resulting in the wear of the optical brightness enhancement film layer 70, since there is an NCVM coating layer 30 under the first transparent protective layer 50, the worn area The visual difference from the unworn area is also insignificant, which improves the durability and wear resistance of the coating structure.

In some embodiments, the second transparent protective layer 90 may employ an AF coating.

In some embodiments, the second transparent protective layer 90 is a modified silicone coating with dual functions of penetration and coverage. The modified silicone coating is prepared by using perfluoropolyether and silane coupling agent as main raw materials, and the dosage ratio of perfluoropolyether and silane coupling agent is about 1:2. Among them, the main chain of the perfluoropolyether is composed of the ether chain of —CF ₂ —O—CF ₂ —. After adding a silane coupling agent (the molecular formula is R ₃ -Si-Y, and R represents a hydrolyzable group) , two C-Si bonds can be added to its main chain through the reaction, and the synthetic molecular formula is the compound shown by the following chemical structural formula:

Through the above modification, the adhesion of the modified silicone coating on the optical brightness enhancement film layer 70 is significantly improved, for example, the adhesion of the above-mentioned AF coating is improved by 2 times.

The thickness of the modified silicone coating is 3-15 μm, which can well protect the optical brightness enhancement film layer 70 without affecting the original gloss of the optical brightness enhancement film layer 70, while the existing commonly used AF coatings or The thickness of the PU/UV coating is mostly less than 3 μm. Therefore, compared with the existing protective coating, the modified silicone coating in this embodiment has more excellent wear resistance.

To sum up, the coating structure of this embodiment includes the NCVM primer layer 10 , the NCVM coating layer 30 , the first transparent protective layer 50 , the optical brightness enhancement film layer 70 and the second transparent protective layer 90 , which are sequentially laminated on the surface of the substrate. , by arranging the first transparent protective layer 50 on the NCVM coating layer 30, and the optical brightness enhancement film layer 70 on the first transparent protective layer 50, the transmission and reflection of light can be comprehensively improved, showing a high-brightness ceramic At the same time, after part of the optical brightness enhancement film layer 70 is worn, due to the reflective gloss of the NCVM coating layer 30, the visual difference between the worn area and the unworn area can be weakened and the visual difference is not obvious, thereby improving the durability of the coating structure. and wear resistance.

Example 2

Referring to FIG. 2 , an embodiment of the present application further provides a coating structure, which is different from the above-mentioned embodiments in that the coating structure further includes a primer layer 100 and a color paint layer 110 sequentially stacked on the surface of the substrate 200 , the NCVM primer layer 10 is laminated on the color paint layer 110 , and the NCVM primer layer 10 is mainly used to enhance the adhesion of the NCVM coating layer 30 on the surface of the substrate 200 .

The primer layer 100 is directly formed on the surface of the substrate 200 to protect the surface of the substrate 200 and to enhance the adhesion of the color paint layer 30 on the surface of the substrate 200 . In one embodiment, the primer layer 100 includes a first primer layer 101, a second primer layer 102 and a third primer layer 103, a first primer layer 101, a second primer layer 102, and a third primer layer The paints used in the three layers 103 may be partially or totally the same, or may be partially or totally different.

Optionally, the adhesion of the paint used in the first primer layer 101 on the surface of the substrate 200 is greater than the adhesion of the second primer layer 102 on the surface of the substrate 200, and the second primer layer 102 and the third primer layer 102. The paint used in 103 is the same, that is, the primer layer 100 can be regarded as including only the first and second primer layers, so that the first primer layer 101 is used as a connecting primer, which can improve the performance of the entire primer layer 100. Adhesion on the surface of the substrate 200; on the other hand, by providing the first primer layer 101, the second primer layer 102 and the third primer layer 103, the hardness of the entire primer layer 100 is also improved.

Optionally, the thicknesses of the first primer layer 101 , the second primer layer 102 , and the third primer layer 103 are all 8-15 μm, so as to ensure that the primer layer 100 can reach a certain hardness. The thicknesses of the first primer layer 101, the second primer layer 102, and the third primer layer 103 may be partially or completely the same, or may be partially or completely different, which is not limited in the embodiments of the present application.

In order to improve the orange peel and flatness of the primer layer 100, the surface of the primer layer 100 away from the surface of the substrate 200 may be polished. For example, in the above embodiment, the surface of the third primer layer 103 may be polished. The grinding removal is 5-15 μm.

The color paint layer 110 is used to make the coating structure present a certain color as a whole, for example, blue-violet, champagne or orange-red, etc. The color paint layer 110 is selected from the paint model of the second primer layer 102 or the third primer layer 103 Paints with the same or similar paint properties to better adhere to the third primer layer 103 .

Optionally, the thickness of the color paint layer 110 is 8-15 μm. It can be understood that, in some embodiments, the coating structure may not include the color paint layer 110 , and the primer layer 100 may have its own color, or the color to be displayed is the natural color of the substrate 200 .

The NCVM primer layer 10 serves to connect the colored paint layer 110 (or the primer layer 100 ) and the NCVM coating layer 30 , thereby increasing the bonding force between the colored paint layer 110 and the NCVM coating layer 30 . The settings of the NCVM primer layer 10 , the NCVM coating layer 30 , the first transparent protective layer 50 , the optical brightness enhancement film layer 70 and the second transparent protective layer 90 are the same as those in the above-mentioned embodiment, and are not repeated here.

In this embodiment, through the primer layer 100 and the color paint layer 110 on the surface of the substrate 200, the appearance of the substrate 200 can be varied; wherein, the primer layer 100 includes a first primer layer 101, a second primer layer The paint layer 102 and the third primer layer 103 can better protect the surface of the substrate 200 and improve the adhesion of the entire primer layer 100 on the surface of the substrate 200 .

Example 3

The embodiment of the present application also provides a method for preparing the above coating structure, as shown in FIG. 3 , the method includes the following steps:

(1) Provide and treat the surface of the substrate;

(2) spray paint three times on the surface of the base material to form the first primer layer, the second primer layer and the third primer layer respectively;

(3) grinding the third primer layer;

(4) spraying colored paint on the third primer layer to form a colored paint layer;

(5) the paint is sprayed on the colored paint layer, and the NCVM primer layer is formed after curing;

(6) The NCVM coating layer is formed on the NCVM primer layer by discontinuous coating technology;

(7) forming the first transparent protective layer on the NCVM coating layer;

(8) forming an optical brightness enhancement film on the first transparent protective layer through an optical coating process;

(9) A second transparent protective layer is formed on the optical brightness enhancement film layer.

Wherein, in the above step (1), different substrates need to be treated in different ways. Optionally, in this embodiment, metal substrates or plastic substrates are used. For metal substrates (eg, aluminum alloys), sandpaper can be used. Grind the broken seam of the antenna combined with aluminum and plastic, and do E treatment; for the plastic substrate, sandpaper can be used to polish the injection molding parting line.

In the above step (2), the adhesion of the paint used in the first primer layer on the surface of the substrate is greater than the adhesion of the second primer layer on the surface of the substrate, and the second primer layer and the third primer The paint used for the paint coat is the same, while the thickness of the three primer coats can be the same or different. The three primer layers are all cured by heating, and the baking conditions are all 110-130°C and 15-30min.

In the above step (3), the third primer layer can also be sanded with sandpaper, for example, by 800# sponge sandpaper + 1500# sandpaper, after sanding, the thickness of the third primer layer is partially removed or All removed.

In the above-mentioned step (4), the color paint is selected from the same type of paint or paint with similar paint performance as the paint used in the second primer layer or the third primer layer.

In the above step (5), the NCVM primer layer is a coating formed by spraying on the surface of the substrate 200 before the NCVM coating layer is formed by the discontinuous coating technology or the non-conductive electroplating technology, and is used to enhance the NCVM coating layer on the substrate. surface adhesion. The NCVM primer layer can be an ultraviolet curing (Ultraviolet Curing, UV) paint or a polyurethane (Polyurethane, PU) paint, with a thickness of 10-15 μm.

In the above step (6), the NCVM coating layer formed by the discontinuous coating technology can reflect part of the light, thereby improving the pattern, texture and/or color on the substrate. Optionally, the NCVM coating layer is an indium layer, and the thickness is preferably 3-20 nm.

In the above step (7), the first transparent protective layer can be formed by spraying, vapor deposition and coating. Optionally, the first transparent protective layer is a low molecular weight UV-curable hardened coating with high hardness and high transparency, its surface hardness is ≥4H, and its transparency is ≥85%.

In the above step (8), an optical brightness enhancement film layer may be formed on the first transparent protective layer by sputtering or evaporation, wherein the optical brightness enhancement film layer includes a metal oxide layer, and the metal oxide in the metal oxide layer is oxidized The material is selected from at least one of Ti ₂ O ₅ , ZrO ₂ and SiO ₂ .

In the above step (9), similarly, the second transparent protective layer can be formed on the optical brightness enhancement film layer by spraying, vapor deposition, coating or the like.

In some embodiments, the second transparent protective layer is a modified silicone coating comprising a compound whose molecular formula is shown by the following chemical structural formula:

where -SiOR represents siloxy;

Its thickness is 3-15 μm.

Those skilled in the art can understand that the examples of the coating structure in the embodiments of the present application (ie, the product examples) and the examples of the preparation method of the coating structure (ie, the method examples) are based on the same inventive concept, and the product The technical contents in the embodiments are also applicable to the method embodiments, and therefore, the technical contents in the product embodiments that are the same as those in the method embodiments are not repeated here.

The embodiments of the present application also provide a material product, including a substrate and the above coating structure laminated on the surface of the substrate, wherein the substrate includes a metal substrate or a plastic substrate.

The implementation of the present application also provides an electronic product, including a casing, and the casing is made of the above material product. In practical applications, the electronic products may be mobile phones, tablet computers, smart watches, and the like.

It should be noted that preferred embodiments of the present application are given in the description of the present application. However, the present application can be implemented in many different forms, and is not limited to the embodiments described in the present specification. As an additional limitation on the content of the present application, these examples are provided to provide a thorough and complete understanding of the disclosure of the present application. In addition, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for those of ordinary skill in the art, they can be improved or transformed according to the above description. , and all these improvements and transformations should belong to the protection scope of the appended claims of the present application.

Claims

A coating structure comprises an NCVM primer layer, an NCVM coating layer, a first transparent protective layer, an optical brightening film layer and a second transparent protective layer which are sequentially laminated on the surface of a substrate.
The coating structure of claim 1 wherein,

The NCVM coating layer is an indium layer;

The optical brightness enhancement film layer includes a metal oxide layer, and the metal oxide in the metal oxide layer is selected from at least one of Ti 2 O 5 , ZrO 2 , and SiO 2 .
The coating structure of claim 2, wherein,

The thickness of the indium layer is 3-20 nm;

The thickness of the metal oxide layer is 30-200 nm.
The coating structure of claim 1 wherein,

The first transparent protective layer is a low-molecular-weight UV-curable hardened coating;

The thickness of the first transparent protective layer is 15-25 μm.
The coating structure of claim 4, wherein,

The second transparent protective layer is a modified organosilicon coating, and the modified organosilicon coating comprises a compound whose molecular formula is shown by the following chemical structural formula:

where -SiOR represents siloxy;

The thickness of the modified silicone coating is 3-15 μm.
The coating structure according to any one of claims 1-5, wherein,

Also include a primer layer and a color paint layer stacked on the surface of the substrate in sequence, and the NCVM primer layer is stacked on the color paint layer;

Wherein, before the color paint layer is laminated on the primer layer, the thickness of the primer layer is partially removed by grinding.
The coating structure of claim 6, wherein,

The primer layer includes a first primer layer, a second primer layer and a third primer layer, and the color paint layer is laminated on the third primer layer;

The thicknesses of the first primer layer, the second primer layer, the third primer layer and the color paint layer are all 8-15 μm, and the grinding removal amount of the third primer layer is 5-15μm.
A method for preparing a coating structure as claimed in any one of claims 1-7, comprising:

The coating is sprayed on the surface of the substrate, and the NCVM primer layer is formed after curing;

forming the NCVM coating layer on the NCVM primer layer by discontinuous coating technology;

forming the first transparent protective layer on the NCVM coating layer;

forming the optical brightness enhancement film layer on the first transparent protective layer through an optical coating process;

The second transparent protective layer is formed on the optical brightness enhancement film layer.
An article of material comprising a substrate, and the coating structure of any one of claims 1-7 laminated on the surface of the substrate.
An electronic product comprising a housing made of the article of material of claim 9 .