CN111438636A

CN111438636A - Local frosted material, preparation method, local frosted shell and electronic equipment

Info

Publication number: CN111438636A
Application number: CN202010156854.4A
Authority: CN
Inventors: 刘桥生; 贾瑞; 罗勇
Original assignee: VDL Industry Shenzhen Co Ltd
Current assignee: VDL Industry Shenzhen Co Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-07-24
Anticipated expiration: 2040-03-09
Also published as: CN111438636B

Abstract

The invention relates to the technical field of plastics, in particular to a local frosted plastic material. The local frosted material disclosed by the invention comprises a base material and a hardened layer arranged on the base material, wherein a frosted area and a smooth area are arranged on the surface of the hardened layer, the surface of the base material is a plastic surface, and the hardened layer is arranged on the plastic surface. The material has frosted local area, bright local area and cool appearance. And the local abrasive material can be further firmly combined with the functional coating, so that the local abrasive material has better holding performance.

Description

Local frosted material, preparation method, local frosted shell and electronic equipment

Technical Field

The invention relates to the technical field of plastics, in particular to a local frosted material, a preparation method of the local frosted material, a local frosted shell and electronic equipment.

Background

The plastic has the advantages of low cost, easy processing and collision resistance, but the appearance of the common finished product is not rich enough, the hand feeling is not preferred by most people, and the plastic is not suitable for being used in contact with daily life. The plastic appearance with local dull polish effect is comparatively dazzlingly cool, but the surface of the plastic material with local dull polish effect that traditional technology prepared often is difficult to use the functional coating stable combination who experiences with other improvement, therefore the plastic of local dull polish often is difficult to have ideal performance.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a partially abrasive material and a method for preparing the partially abrasive material, which can be stably combined with a functional coating layer to provide better usability.

The technical scheme of the invention is as follows.

The utility model provides a local dull polish material, local dull polish material include the substrate and set up in sclerosis layer on the substrate, there are dull polish region and plain noodles region in the surface on sclerosis layer, the surface of substrate is the plastic surface, the sclerosis layer set up in the plastic is on the surface.

In one embodiment, the hardened layer is formed by coating a fluorine-free coating on the surface of the substrate and curing the fluorine-free coating.

In one embodiment, the fluorine-free coating is a fluorine-free photocurable coating.

In one embodiment, the frosted area is formed by the hardened layer through physical frosting treatment, and the frosted area and the hardened layer are of an integrated structure.

In one embodiment, the frosted area is formed by local frosting treatment of the hardened layer, and the frosted area is a separate frosted layer.

In one embodiment, the frosted area is formed by chemically frosting the hardened layer, and the frosted area is a separate frosted layer arranged on the surface of the hardened layer.

In one embodiment, the frosted area and the smooth area are further provided with an anti-fingerprint coating.

In one embodiment, the anti-fingerprint coating is formed by coating an AF anti-fingerprint surface treatment agent on the surface of the hardening layer.

A preparation method of a local abrasive material comprises the following steps:

providing a substrate, wherein the surface of the substrate is a plastic surface;

hardening the surface of the base material;

and carrying out local frosting treatment on the hardened plastic surface.

In one embodiment, the hardening treatment is performed by curtain coating a fluorine-free coating and curing the fluorine-free coating.

In one embodiment, the thickness of the hardened layer formed by the hardening treatment may be 1 μm to 100 μm.

In one embodiment, the partial sanding process includes:

carrying out local protection treatment on the non-frosted area;

performing frosting treatment on the surface of the base material subjected to the local protection treatment; and

and (4) performing the depainting treatment on the base material after the frosting treatment.

In one embodiment, the local protective treatment is performed by applying a local protective layer to the non-frosted area of the surface of the hardened substrate.

In one embodiment, the method of the local protection treatment is screen printing to form a local protection layer.

In one embodiment, the material of the partial protective layer is selected from a protective film, a peelable glue, an ink or a paint.

In one embodiment, the thickness of the local protection layer is 1 μm to 100 μm.

In one embodiment, the thickness of the local protection layer is 5 μm to 20 μm.

In one embodiment, the sanding process is selected from a chemical sanding process or a physical sanding process.

In one embodiment, the chemical sanding method is spraying AG spraying liquid.

In one embodiment, the physical sanding method is laser etching or sand blasting.

In one embodiment, the method for preparing the local frosted material further comprises the step of forming an anti-fingerprint coating.

In one embodiment, the anti-fingerprint coating is formed by coating an AF anti-fingerprint surface treatment agent on the surface of the plastic.

In one embodiment, the coating is selected from spray coating, curtain coating, or physical vapor deposition.

The invention also aims to provide a plastic shell prepared from the local frosted material.

A partial sanding shell made from the partial sanding material of any of the above embodiments, or made by the method of any of the above embodiments.

It is a further object of the present invention to provide a personal electronic device including the above-described housing.

A personal electronic device, wherein the housing or protective cover is the partially frosted housing.

The surface of the local abrasive material provided by the invention has the abrasive area and the smooth area, and the appearance effect is cool. Through forming the sclerosis layer at the surface, and then can strengthen the stability that functional coating and this local dull polish material combine, promote its workable type and performance.

The preparation method of the local frosted material is not complex in process, has no limit to the types or surface states of base materials and the like, is low in processing difficulty and raw material cost, and is easy for batch production.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a local abrasive material provided by the present invention.

Fig. 2 is a schematic top view of a structure of the local abrasive material prepared by the method for preparing the local abrasive material provided by the invention.

FIG. 3 is a diagram of a partially ground plastic product obtained by the method for preparing a partially ground plastic according to the present invention.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the accompanying drawings and specific examples. The embodiments given below are only preferred embodiments of the invention, which can be implemented in many different forms and are not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The plastic outward appearance that has local dull polish effect is comparatively dazzlingly cool, but the local dull polish plastic that traditional chinese art formed has the problem that there is the step position in plain noodles region and dull polish region, or dull polish region often is difficult to use the functional coating of experience with other improvements, for example the problem that anti fingerprint coating combines steadily to lead to the anti fingerprint plastic product of local dull polish effect to use and feel poor. The present invention aims to solve this problem.

In one aspect of the invention, the invention provides a topical abrasive material. According to one embodiment of the present invention, referring to fig. 1, the partially frosted material comprises a substrate, the substrate surface being a plastic surface 110; the curing layer 120 is disposed on the plastic surface 110. The surface of the hardened layer 120 has a frosted area 121 and a smooth area 122. The partially abrasive material surface may also include a functionalized coating 130. Preferably, the functionalized coating 130 is an anti-fingerprint coating. Thus, a locally frosted area is formed on the hardened layer 120, and the frosted area can be stably combined with the functionalized coating 130.

As shown in fig. 1, the hardened layer 120 covers the surface of the substrate, or the orthographic projection of the hardened layer 120 covers the orthographic projection of the substrate 110. The hardened layer 120 may be formed by curing a coating, and preferably, the hardened layer 120 may be formed by applying a fluorine-free coating on the surface of the substrate and curing the coating. More preferably, the fluorine-free coating is a fluorine-free photocurable coating.

The smooth area 122 and the frosted area 121 of the surface of the hardened layer 120 are designed in advance. A smooth area refers to an area that has not been sanded, or that has not been sanded during a sanding process. The smooth surface region may be left untreated by partially covering the surface of the smooth surface region in advance with a protective film, for example, ink, paint, peelable glue, so that the smooth surface region 122 of the hardened layer 120 is protected from the sanding treatment. The frosted area 121 may be formed in a physically frosted area, forming a structure integral with the hardened layer 120; the frosted areas 121 may also be formed by chemical sanding, may be formed as an integral structure with the stiffening layer 120, or may be formed as a separate frosted layer.

This local dull polish plastic is through setting up a sclerosis layer, forms local dull polish region on the sclerosis layer, and then this local dull polish region can combine with functional coating stability. Preferably, the hardened layer is formed of a fluorine-free paint. The fluorine-free coating and the functional coating, such as an anti-fingerprint coating, have stronger bonding force. Thus, the locally abrasive material that can be stably bonded to the functional coating layer can be formed by the hardened layer.

On the other hand, the invention provides a preparation method of the frosted material, which comprises the following steps:

step S1, providing a substrate, wherein the surface of the substrate is a plastic surface;

the plastic substrate can be selected from the shell materials of common portable electronic equipment such as mobile phones or the materials of protective sleeves thereof. Further, some plastic materials with a relatively hard material may be selected, for example, but not limited to, at least one of polycarbonate plastic, polymethyl methacrylate, and ABS plastic.

The plastic substrate can be preprocessed into the shape of the prepared device according to actual requirements, and can also be a finished product of unprocessed plastic plate. The plastic substrate which is preprocessed into the shape of the device can be directly prepared into the needed frosted plastic product by the preparation method provided by the invention.

Before the actual preparation process, the plastic substrate should be cleaned to prevent impurities such as oil stains and dust from affecting the subsequent treatment process of the plastic substrate.

As a specific example, step S1 can be to obtain a plastic substrate with a clean and smooth surface, or a substrate with a plastic surface.

In step S2, the surface of the base material is hardened.

The hardening treatment may be performed by spraying a fluorine-free coating on the surface of the plastic and curing the coating. After the coating is cured, a layer of cured film can be quickly formed on the surface of the plastic substrate, so that the surface of the plastic substrate is smoother, and the next treatment is facilitated.

Preferably, the coating is a uv curable coating during the hardening process. More specifically, the photocurable coating may be a high-hardness photocurable coating. More specifically, it may be a fluorine-free high-hardness photocurable coating. The fluorine-free photocureable coating can be combined with a subsequently formed functional coating more stably.

The thickness of the hardening layer may be 1 μm to 100 μm, and preferably, the thickness of the hardening layer may be 1 μm to 50 μm; more specifically, the thickness of the hardening layer is 5 to 20 μm; for example, the thickness is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm.

As a specific example, the step S2 may be that a high-hardness photo-curable coating is sprayed on the surface to be treated and cured, so as to form a hardened layer on the surface. Preferably, the high-hardness photocurable coating is a fluorine-free photocurable coating.

And step S3, performing local protection treatment on the part of the cured plastic surface which does not need the frosting treatment.

The local protection treatment can be performed by forming a local protection layer on the region of the plastic surface designed to be smooth. Since the whole plastic surface is sanded by the subsequent sanding process in the process of preparing the locally sanded plastic, if a locally sanded and locally bright plastic surface is to be obtained, a local protective layer must be first formed in the area designed to be a bright surface.

The thickness of the protective layer should not be too thick, otherwise the frosted area and the smooth area have obvious steps and are difficult to eliminate. Preferably, the thickness of the protective layer is 1 μm to 50 μm. More preferably, the thickness of the protective layer is 5 μm to 20 μm; more specifically, the thickness of the protective layer is 5 μm to 10 μm. For example, the thickness of the protective layer is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm.

The protective layer material or its precursor should have strippability and certain plasticity, for example, the protective layer material may be selected from one of protective film, strippable glue, ink and paint. The manner of forming the protective layer may be selected corresponding to the selected protective layer material, such as spraying, transferring, or screen printing.

Preferably, the manner of forming the protective layer is screen printing. Screen printing is a relatively common technique that can coat ink and the like onto a substrate in a pre-fabricated shape or pattern, and has a simple and easy operation method and low cost.

After the above materials or their precursors are screen-printed on the surface of the plastic substrate designed as a smooth area, they should be further dried. The drying condition can be low temperature drying at 100-150 ℃, and the drying atmosphere can be air, vacuum or protective gas.

As a specific example, in step S2, a layer of peelable glue with a thickness of 5 μm to 10 μm is formed on the hardened plastic surface by screen printing, and then dried in a low-temperature oven.

Step S4, the surface of the plastic after the partial protection treatment is frosted.

The frosted treatment is to form the extremely fine particles or grooves on the surface of the base material to generate diffuse reflection to light, and the hand feeling of the surface of the frosted material is obviously better than that of the non-frosted material.

Specifically, the sanding treatment may be selected from a chemical sanding treatment or a physical sanding treatment.

More specifically, for example, the chemical sanding process is performed by spraying or curtain-coating AG (Anti-Glare) spray solution on the surface of the plastic. AG spray is a commonly used surface treatment agent, usually containing nano-sized silica particles, which can form a uniform film on the surface of a substrate. The large amount of nano-scale particles on the surface of the film layer enables the surface of the plastic base material to have frosted feeling and better holding hand feeling.

More specifically, for example, the physical sanding process is usually performed by grinding or etching the original surface of the substrate, so as to generate fine grooves and protrusions on the original surface of the substrate, thereby forming a frosted region. The physical sanding treatment may be at least one selected from the group consisting of laser etching and sand blasting.

And laser etching, namely, a plurality of fine grooves are etched on the surface of the base material by adopting laser, so that a fine uneven appearance is formed on the surface of the plastic, and a region with frosted texture is formed. The light is diffusely reflected on the uneven surface of the plastic, so that the plastic has frosted texture.

The blasting treatment is generally carried out by ejecting a high-speed, extremely fine-grained nanoparticulate material using compressed air as a motive force. The nano particles impact the surface of the plastic, and then a nano-sized uneven shape is formed on the surface of the plastic, so that a frosted area is formed. The process difficulty of sand blasting is generally low, the cost of the used materials is not high, and the mass production is easy.

As a specific example, in step S4, the surface of the plastic after the partial protection may be subjected to a physical sanding process, where the physical sanding process is performed by sand blasting.

The schematic plan view of the partially frosted material obtained by the preparation method is shown in fig. 2.

And step S5, performing the deprotection treatment on the frosted plastic surface.

The purpose of the deprotection processing is to peel off the partial protection layer formed by the partial protection processing in step S3. Therefore, the specific manner should be selected according to the material of the local protection layer formed by the local protection process in step S3, which is not limited by the present invention. When the release capacity of the local protective layer is stronger or the film forming capacity is stronger, the local protective layer is mechanically stripped by a physical method, for example, a scraper is used for scraping the local protective layer; it can also be directly torn off. For some materials that are difficult to remove mechanically, suitable solvents or substances may be selected to dissolve or react away to allow peeling.

As a specific example, step S5 may be to scrape the peelable glue off the plastic substrate to expose the smooth area of the plastic that has not been sanded.

After the steps, the material with local frosted texture can be formed. The topical abrasive material may be stabilized in combination with a further formed functionalized coating. The plastic surface is very prone to accumulating fingerprints, dust and oil stains, and has a bad influence on the hand feeling and experience in the using process, so that the surface of the equipment which can be held is usually provided with an anti-fingerprint coating. Therefore, the anti-fingerprint coating can be further formed on the surface of the local abrasive material, so that the local abrasive material with better service performance and better anti-fingerprint performance is obtained.

The Anti-fingerprint coating is formed by coating an AF (Anti-fingerprint) Anti-fingerprint surface treatment agent on the surface of the plastic and curing and molding the plastic.

The specific way of coating can be spraying, curtain coating or physical vapor deposition.

The overall frosted plastic has a monotonous appearance and is not rich in color. Meanwhile, in the local frosted plastic with the frosted area and the smooth area, the smooth area can reflect rich colors, the appearance is cool, and the frosted area has good holding hand feeling, so that the plastic is touted.

However, the method of fully sanding plastics is not suitable for preparing partially sanded plastics. If the preparation method of the full-surface frosted plastic is carried out, the situation that the bonding force between the physical frosted area and the functional coating (such as the anti-fingerprint coating) formed by the AF anti-fingerprint surface treatment agent is poor exists, so that the plastic does not have the anti-fingerprint effect. It may also result in the formation of distinct sharp steps in the finished and frosted areas during the manufacturing process. The step position not only influences the appearance, but also is easy to cut hands and scratch, and greatly reduces the use experience. That is, the conventional method for fully sanding plastics is not suitable for the method for preparing partially sanded plastics.

The invention particularly provides a preparation method of fingerprint-resistant frosted plastic, which comprises the step of hardening by using a coating in advance to form a hardened layer, wherein the hardened layer can effectively solve the problems existing in the preparation process of the local frosted plastic.

Compared with the traditional method, the preparation method has the advantages of uncomplicated process, low requirement on equipment and easy large-scale production. The fingerprint-resistant local frosted plastic prepared by the preparation method has a frosted area with good hand feeling and a gorgeous smooth area, and also has a fingerprint-resistant effect, so that the plastic has excellent use experience. The plastic can be further processed into a plastic cover plate applied to a portable electronic product, and has the advantages of low cost of raw materials and collision resistance and no breakage of a finished product, and has a very wide application prospect.

According to the steps of the preparation method, the fingerprint-resistant local frosted plastic can be prepared.

Furthermore, the anti-fingerprint local frosted plastic prepared by the method can be further processed into a plastic shell, and the plastic shell can be applied to shells or protective shells of various portable electronic products such as smart phones, so that the plastic shell has excellent appearance and use experience and has a very wide application prospect.

Furthermore, the plastic rear cover can be applied to a housing of a portable electronic device to replace a conventional glass or ceramic housing. Compared with a glass or ceramic shell, the electronic equipment taking the plastic rear cover as the shell is more resistant to collision and is not easy to break.

In order to make the objects and advantages of the present invention more apparent, the following embodiments are provided to explain the preparation method and effects of the partially frosted plastic of the present invention in detail, and it should be understood that the embodiments described herein are only for explaining the present invention and should not be construed as limiting the present invention.

Specific materials or equipment used in examples are commercially available without specific description.

Example 1

Plastic cover plate with local frosted area effect

(1) Hardening treatment: preparing a clean plastic cover plate which is formed in advance, spraying a layer of high-hardness fluorine-free photocureable coating on the surface of the plastic cover plate, and applying ultraviolet light for 5min to completely solidify the coating, thereby forming a hardened layer on the surface of the plastic cover plate.

(2) Forming a local protective layer: and printing a layer of peelable glue on the region, designed as the smooth surface, of the plastic cover plate with the hardened layer formed on the surface in a screen printing mode to form a local protective layer, wherein the thickness of the protective layer is 7 microns.

(3) Sanding treatment: and (3) performing frosting treatment on the plastic cover plate with the partial protective layer formed on the surface by adopting a sand blasting method, so that the whole surface has frosted texture.

(4) Protection removal: and peeling the peelable glue on the surface of the plastic rear cover subjected to the frosting treatment by using a scraper to expose the original plastic surface which is still a smooth surface.

(5) Anti-fingerprint treatment: and (3) integrally spraying an AF fingerprint-resistant surface treatment agent on the surface of the plastic rear cover subjected to the protection removing treatment, and curing and forming to obtain the local frosted plastic rear cover with the fingerprint-resistant effect.

Example 2

Plastic cover plate with local frosted area effect

(1) Hardening treatment: preparing a clean plastic cover plate which is formed in advance, spraying a layer of high-hardness photocureable coating on the surface of the plastic cover plate, and applying ultraviolet irradiation for 3min to completely cure the coating, thereby forming a hardened layer on the surface of the plastic cover plate.

(2) Forming a local protective layer: and printing a layer of peelable glue on the region, designed as the smooth surface, of the plastic cover plate with the hardened layer formed on the surface in a screen printing mode to form a local protective layer, wherein the thickness of the protective layer is 9 microns.

(3) Sanding treatment: and performing frosting treatment on the plastic cover plate with the partial protective layer formed on the surface by adopting a laser etching method, so that the whole surface has frosted texture.

Example 3

Plastic cover plate with local frosted area effect

(1) Hardening treatment: preparing a clean plastic cover plate which is formed in advance, spraying a layer of high-hardness photocureable coating on the surface of the plastic cover plate, and applying ultraviolet irradiation for 5min to completely cure the coating, thereby forming a hardened layer on the surface of the plastic cover plate.

(2) Forming a local protective layer: and printing a layer of paint on the region, designed as the smooth surface, of the plastic cover plate with the hardened layer formed on the surface in a screen printing mode to form a local protective layer, wherein the thickness of the protective layer is 5 microns.

(3) Sanding treatment: and (3) performing frosting treatment on the plastic cover plate with the partial protective layer formed on the surface by adopting a method of spraying AG spraying liquid, so that the whole surface has frosted texture.

(4) Protection removal: and stripping a film formed by paint on the surface of the frosted plastic rear cover by using a scraper to expose the original plastic surface which is still a smooth surface.

Comparative example 1

(1) Forming a local protective layer: and printing a layer of peelable glue on the region, designed as the smooth surface, of the plastic cover plate with the hardened layer formed on the surface in a screen printing mode to form a local protective layer, wherein the thickness of the protective layer is 7 microns.

(2) Sanding treatment: and (3) performing frosting treatment on the plastic cover plate with the partial protective layer formed on the surface by adopting a sand blasting method, so that the whole surface has frosted texture.

(3) Protection removal: and peeling the peelable glue on the surface of the plastic rear cover subjected to the frosting treatment by using a scraper to expose the original plastic surface which is still a smooth surface.

(4) Anti-fingerprint treatment: and (3) integrally spraying an AF fingerprint-resistant surface treatment agent on the surface of the plastic rear cover subjected to the protection removing treatment, and curing and forming to obtain the local frosted plastic rear cover with the fingerprint-resistant effect.

Comparative example 2

Plastic cover plate with local frosted area effect

(1) Forming a local protective layer: and printing a layer of paint on the region, designed as the smooth surface, of the plastic cover plate with the hardened layer formed on the surface in a screen printing mode to form a local protective layer, wherein the thickness of the protective layer is 5 microns.

(2) Sanding treatment: and (3) performing frosting treatment on the plastic cover plate with the partial protective layer formed on the surface by adopting a method of spraying AG spraying liquid, so that the whole surface has frosted texture.

(3) Protection removal: and stripping a film formed by paint on the surface of the frosted plastic rear cover by using a scraper to expose the original plastic surface which is still a smooth surface.

The local area frosted plastic cover plates obtained in the above embodiments and comparative examples were evaluated as to whether there are steps in the polished surface and the frosted area and whether the bonding effect of the anti-fingerprint coating layer is stable, and the evaluation results are shown in table 1.

TABLE 1

As can be seen from table 1, as shown in examples 1 to 3, the plastic rear cover with the partially frosted effect prepared by the method for preparing the partially frosted plastic provided by the present application adopts a hardening treatment mode, so that the step between the smooth surface area and the frosted area is eliminated, the anti-fingerprint coating and the plastic substrate are stably combined together, and the problems in the conventional technologies as shown in comparative examples 1 and 2 are effectively overcome.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

In the above embodiments, the plastic back cover applicable to the mobile phone is used as an implementation object, which is only used to illustrate a practical scene, but the plastic back cover of the mobile phone is not considered to be a limitation to the scope of the present invention. It will be appreciated that the focus of the present invention is to form a firmly bonded fingerprint resistant coating on a partially frosted plastic.

It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a local dull polish material, its characterized in that, local dull polish material include the substrate and set up in sclerosis layer on the substrate, there are dull polish region and plain noodles region in the surface on sclerosis layer, the surface of substrate is the plastic surface, the sclerosis layer set up in the plastic is on the surface.

2. The partially frosted material of claim 1, wherein the hardened layer is formed by applying a fluorine-free coating on the surface of the substrate and curing the fluorine-free coating.

3. The partially frosted material of claim 1, wherein the frosted area is physically frosted by the stiffening layer, and wherein the frosted area and the stiffening layer are a unitary structure.

4. The partially frosted material of claim 1, wherein said frosted area is formed by chemically frosting said hardened layer, and said frosted area is a separate frosted layer disposed on the surface of said hardened layer.

5. The topical abrasive material according to any one of claims 1 to 4, wherein said abrasive area and said smooth area are further provided with an anti-fingerprint coating.

6. The preparation method of the local abrasive material is characterized by comprising the following steps:

hardening the surface of the base material;

and carrying out local frosting treatment on the hardened plastic surface.

7. The method of claim 6, wherein the hardening process is performed by curtain coating a fluorine-free coating and curing the fluorine-free coating.

8. The method for preparing the local abrasive material according to any one of claims 6 to 7, wherein the local abrasive treatment comprises:

carrying out local protection treatment on the non-frosted area;

9. The method of claim 8, wherein the topical protective treatment is applied by applying a topical protective layer to the non-frosted areas of the surface of the hardened substrate.

10. The method of preparing a topical abrasive material according to claim 9, wherein the material of the topical protective layer is selected from a protective film, a peelable glue, an ink or a paint.

11. The method of producing a topical abrasive material according to any one of claims 6 to 7 and 9 to 10, wherein the abrasive treatment is selected from a chemical abrasive treatment and a physical abrasive treatment.

12. The method of claim 11, wherein the chemical sanding is performed by forming a layer of abrasive coating; the physical frosting treatment mode is to etch or polish the surface of the plastic to form a frosted area.

13. The method of producing a topical abrasive material according to any one of claims 6 to 7, 9 to 10 and 12, further comprising the step of forming an anti-fingerprint coating layer.

14. The method of producing a topical abrasive material according to claim 13 wherein the anti-fingerprint coating is formed by applying an AF anti-fingerprint surface treatment to the surface of the substrate after the topical abrasive treatment.

15. A partial sanding shell prepared from the partial sanding material according to any one of claims 1 to 5 or prepared from the partial sanding material prepared by the method according to any one of claims 6 to 14.

16. An electronic device characterized in that its housing or protective cover is the partial sanding housing of claim 15.