CN108059744A - A kind of material for manufacturing phone housing and preparation method thereof - Google Patents
A kind of material for manufacturing phone housing and preparation method thereof Download PDFInfo
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- CN108059744A CN108059744A CN201810117227.2A CN201810117227A CN108059744A CN 108059744 A CN108059744 A CN 108059744A CN 201810117227 A CN201810117227 A CN 201810117227A CN 108059744 A CN108059744 A CN 108059744A
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- parts
- phone housing
- resin
- glass fibre
- antiseptic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses a kind of materials for manufacturing phone housing and preparation method thereof, which is characterized in that in terms of parts by weight, the material mainly includes following components：22 42 parts of resin copolymer of acrylonitrile ethylene propylene diene rubber styrene resin, 14 23 parts of polycarbonate, 13 26 parts of epoxy resin, 21 34 parts of nitrile rubber, 1.3 6.5 parts of glass fibre, 0.3 2.2 parts of silicon carbide whisker, 0.5 3.8 parts of nano-titanium dioxide, compatilizer 2 10, antiseptic 0.05 2, lubricant 0.4 2.The material by mixed at high speed, extruding pelletization and etc. be made.The material of present invention manufacture mobile phone shell has that hardness is high, wearability and heat-resist, while has preferable antibacterial effect, and preparation process is simple, industrialized production easy to implement.
Description
Technical field
The present invention relates to mobile phone shell field of material technology, and in particular to a kind of material for manufacturing mobile phone shell and its preparation side
Method.
Background technology
Mobile phone has become part indispensable in people's life as a kind of means of communication generally used, with existing
In the popularization of smart mobile phone, mobile phone is more and more wider to application range in daily life, and smart mobile phone is as scientific and technological integrated level
Higher equipment, this just proposes huge challenge to the protection of mobile phone, special to the damage of circuit board when mobile phone is hit
It is not big, it is possible to be possible to that mobile phone can not be repaired between once casual collision, plastics are excellent because of its light weight, cheap etc.
Point and in mobile phone protecting case field broad development, but existing mobile phone shell plastic construction intensity is low, drops or is subject in mobile phone
Bending phenomenon easily occurs during impact, cannot play preferable protection to the component of interior of mobile phone, and it is heat resistance itself, resistance to old
The property changed is poor, antibiotic property is poor, pressure derating under higher temperature, and bearing capacity is low, can not meet demand to the protective effect of mobile phone.
Based on this, it is necessary to a kind of material for manufacturing mobile phone shell and preparation method thereof is proposed, to solve to deposit in the prior art
The problem of.
The content of the invention
In view of the above-mentioned analysis to the prior art, the present invention provides a kind of material for manufacturing mobile phone shell and preparation method thereof,
It is high with hardness, wearability and heat-resist, while there is preferable antibacterial effect.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of material for manufacturing phone housing, in terms of parts by weight, the material mainly includes following components：
Acrylonitrile-ethylene propylene diene rubber -22-42 parts of styrene resin resin copolymer；
14-23 parts of polycarbonate；
13-26 parts of epoxy resin；
21-34 parts of nitrile rubber；
1.3-6.5 parts of glass fibre；
0.3-2.2 parts of silicon carbide whisker
0.5-3.8 parts of nano-titanium dioxide；
Compatilizer 2-10；
Antiseptic 0.05-2；
Lubricant 0.4-2.
Preferably, in terms of parts by weight, the material mainly includes following components：
Acrylonitrile-ethylene propylene diene rubber -30 parts of styrene resin resin copolymer；
19 parts of polycarbonate；
20 parts of epoxy resin；
29 parts of nitrile rubber；
3.8 parts of glass fibre；
1.3 parts of silicon carbide whisker
2.1 parts of nano-titanium dioxide；
Compatilizer 6；
Antiseptic 1；
Lubricant 1.2.
Preferably, the diameter of the glass fibre is between 4-10 μm.
Preferably, the grain size of the nano-titanium dioxide is 40-100nm.
Preferably, the compatilizer is selected from the random copolymer of phenylethylene-maleic anhydride, methacrylate-fourth two
The terpolymer of alkene-styrene or acrylonitrile-butadiene-styrene (ABS) grafted maleic anhydride.
Preferably, the antiseptic is selected from fragrant aldehyde, ethyl vanillin aldehydes compound, quaternary ammonium salt compound or biguanides
One or more of compound.
Preferably, the lubricant is selected from calcium stearate, tristerin, ethylene double oleamide, polyethylene waxes
Or one or more of silicone oil.
The present invention also provides a kind of preparation methods for the material for manufacturing phone housing, comprise the following steps：
（1）Each raw material is weighed according to regulation component；
（2）Silicon carbide whisker, nano-titanium dioxide, lubricant and antiseptic are put into homogenizer by proportioning, in 90-
High-speed stirred 4-8min at 110 DEG C；
（3）At normal temperatures acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer, poly- carbon resin, asphalt mixtures modified by epoxy resin are added in by proportioning
Fat, nitrile rubber and compatilizer stir 5-10min；
（4）The component obtained after said mixture is put into extruder and carries out extruding pelletization, from glass fibre in extrusion
Mouth adds in glass fibre, mixture is made to keep obtaining polymer at a temperature of molten state, by the polymer obtained with strip
It squeezes out, is then cut to section, form particle to get to the material of the manufacture phone housing.
Preferably, step（2）Middle mixing speed is 800-1000r/min.
Preferably, step（4）In extruder for single screw extrusion machine or double screw extruder, and keep mixture
210-250 DEG C of the temperature of molten state.
Compared with prior art, the present invention the present invention has following advantageous effect：
（1）Acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer that the material of the manufacture phone housing of the present invention uses makes
Obtaining material has good mechanical property, wear-resisting scraping and wiping resistance performance, adds poly- carbon resin to its further reinforcement, and add in
Epoxy resin and nitrile rubber then further enhance the ageing resistance of material, and the silicon carbide whisker and nanometer titanium dioxide added in
Titanium can be very good to disperse in the material, so as to improve the wear-resisting of material product, ageing-resistant performance and intensity since grain size is smaller
Performance.
（2）The present invention improves the hardness on the surface of material by the composite strengthening of glass fibre and silicon carbide whisker, and
The compatilizer of addition to coordinate between each component it is more close, and enable glass fibre and silicon carbide whisker with
Acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer preferably combines, and enhances the wearability and heat resistance of material, and
The antiseptic of addition can increase the anti-microbial property of material, and material can be made to reach 0-1 grades of standards of antibacterial.
（3）The preparation process of the material of the manufacture phone housing of the present invention is simple, industrialized production easy to implement.
Specific embodiment
Form by the following examples is described in further detail the above of the present invention again, but should not be by this
The scope for being interpreted as the above-mentioned theme of the present invention is only limitted to following embodiment, all based on the technology realized belonging to the above of the present invention
It all belongs to the scope of the present invention.
Embodiment 1
A kind of material for manufacturing phone housing, in terms of parts by weight, the material mainly includes following components：
Acrylonitrile-ethylene propylene diene rubber -30 parts of styrene resin resin copolymer；
19 parts of polycarbonate；
20 parts of epoxy resin；
29 parts of nitrile rubber；
3.8 parts of glass fibre；
1.3 parts of silicon carbide whisker
2.1 parts of nano-titanium dioxide；
Compatilizer 6；
Antiseptic 1；
Lubricant 1.2.
Wherein, the diameter of the glass fibre is between 7 μm.
Wherein, the grain size of the nano-titanium dioxide is 70nm.
Wherein, the compatilizer is selected from random copolymer, the metacrylate-butadiene-benzene of phenylethylene-maleic anhydride
The terpolymer of ethylene or acrylonitrile-butadiene-styrene (ABS) grafted maleic anhydride.
Wherein, the antiseptic is selected from fragrant aldehyde, ethyl vanillin aldehydes compound, quaternary ammonium salt compound or biguanides chemical combination
One or more of object.
Wherein, the lubricant is selected from the double oleamides of calcium stearate, tristerin, ethylene, polyethylene wax or silicon
One or more of oil.
The present invention also provides a kind of preparation methods for the material for manufacturing phone housing, comprise the following steps：
（1）Each raw material is weighed according to regulation component；
（2）Silicon carbide whisker, nano-titanium dioxide, lubricant and antiseptic are put into homogenizer by proportioning, at 100 DEG C
Lower high-speed stirred 6min；
（3）At normal temperatures acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer, poly- carbon resin, asphalt mixtures modified by epoxy resin are added in by proportioning
Fat, nitrile rubber and compatilizer, stir 7.5min；
（4）The component obtained after said mixture is put into extruder and carries out extruding pelletization, from glass fibre in extrusion
Mouth adds in glass fibre, mixture is made to keep obtaining polymer at a temperature of molten state, by the polymer obtained with strip
It squeezes out, is then cut to section, form particle to get to the material of the manufacture phone housing.
Wherein, step（2）Middle mixing speed is 900r/min.
Wherein, step（4）In extruder for single screw extrusion machine or double screw extruder, and mixture is made to keep fusing
230 DEG C of the temperature of state.
Embodiment 2
A kind of material for manufacturing phone housing, in terms of parts by weight, the material mainly includes following components：
Acrylonitrile-ethylene propylene diene rubber -22 parts of styrene resin resin copolymer；
14 parts of polycarbonate；
13 parts of epoxy resin；
21 parts of nitrile rubber；
1.3 parts of glass fibre；
0.3 part of silicon carbide whisker
0.5 part of nano-titanium dioxide；
Compatilizer 2；
Antiseptic 0.05；
Lubricant 0.4-.
Wherein, the diameter of the glass fibre is between 4 μm.
Wherein, the grain size of the nano-titanium dioxide is 40nm.
Wherein, the compatilizer is selected from random copolymer, the metacrylate-butadiene-benzene of phenylethylene-maleic anhydride
The terpolymer of ethylene or acrylonitrile-butadiene-styrene (ABS) grafted maleic anhydride.
Wherein, the antiseptic is selected from fragrant aldehyde, ethyl vanillin aldehydes compound, quaternary ammonium salt compound or biguanides chemical combination
One or more of object.
Wherein, the lubricant is selected from the double oleamides of calcium stearate, tristerin, ethylene, polyethylene wax or silicon
One or more of oil.
The present invention also provides a kind of preparation methods for the material for manufacturing phone housing, comprise the following steps：
（1）Each raw material is weighed according to regulation component；
（2）Silicon carbide whisker, nano-titanium dioxide, lubricant and antiseptic are put into homogenizer by proportioning, at 90 DEG C
Lower high-speed stirred 4min；
（3）At normal temperatures acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer, poly- carbon resin, asphalt mixtures modified by epoxy resin are added in by proportioning
Fat, nitrile rubber and compatilizer stir 5min；
（4）The component obtained after said mixture is put into extruder and carries out extruding pelletization, from glass fibre in extrusion
Mouth adds in glass fibre, mixture is made to keep obtaining polymer at a temperature of molten state, by the polymer obtained with strip
It squeezes out, is then cut to section, form particle to get to the material of the manufacture phone housing.
Wherein, step（2）Middle mixing speed is 800r/min.
Wherein, step（4）In extruder for single screw extrusion machine or double screw extruder, and mixture is made to keep fusing
210 DEG C of the temperature of state.
Embodiment 3
A kind of material for manufacturing phone housing, in terms of parts by weight, the material mainly includes following components：
Acrylonitrile-ethylene propylene diene rubber -42 parts of styrene resin resin copolymer；
23 parts of polycarbonate；
26 parts of epoxy resin；
34 parts of nitrile rubber；
6.5 parts of glass fibre；
2.2 parts of silicon carbide whisker
3.8 parts of nano-titanium dioxide；
Compatilizer 10；
Antiseptic 2；
Lubricant 2.
Wherein, the diameter of the glass fibre is between 10 μm.
Wherein, the grain size of the nano-titanium dioxide is 100nm.
Wherein, the compatilizer is selected from random copolymer, the metacrylate-butadiene-benzene of phenylethylene-maleic anhydride
The terpolymer of ethylene or acrylonitrile-butadiene-styrene (ABS) grafted maleic anhydride.
Wherein, the antiseptic is selected from fragrant aldehyde, ethyl vanillin aldehydes compound, quaternary ammonium salt compound or biguanides chemical combination
One or more of object.
Wherein, the lubricant is selected from the double oleamides of calcium stearate, tristerin, ethylene, polyethylene wax or silicon
One or more of oil.
The present invention also provides a kind of preparation methods for the material for manufacturing phone housing, comprise the following steps：
（1）Each raw material is weighed according to regulation component；
（2）Silicon carbide whisker, nano-titanium dioxide, lubricant and antiseptic are put into homogenizer by proportioning, at 110 DEG C
Lower high-speed stirred 8min；
（3）At normal temperatures acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer, poly- carbon resin, asphalt mixtures modified by epoxy resin are added in by proportioning
Fat, nitrile rubber and compatilizer stir 10min；
（4）The component obtained after said mixture is put into extruder and carries out extruding pelletization, from glass fibre in extrusion
Mouth adds in glass fibre, mixture is made to keep obtaining polymer at a temperature of molten state, by the polymer obtained with strip
It squeezes out, is then cut to section, form particle to get to the material of the manufacture phone housing.
Wherein, step（2）Middle mixing speed is 1000r/min.
Wherein, step（4）In extruder for single screw extrusion machine or double screw extruder, and mixture is made to keep fusing
250 DEG C of the temperature of state.
It is merely a preferred embodiment of the present invention, is not intended to limit the invention, although with reference to foregoing implementation described in upper
The present invention is described in detail in example, for those skilled in the art, still can be to foregoing embodiments
Recorded technical solution modifies or carries out equivalent substitution to which part technical characteristic.All spirit in the present invention
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of material for manufacturing phone housing, which is characterized in that in terms of parts by weight, the material mainly includes with the following group
Point：
Acrylonitrile-ethylene propylene diene rubber -22-42 parts of styrene resin resin copolymer；
14-23 parts of polycarbonate；
13-26 parts of epoxy resin；
21-34 parts of nitrile rubber；
1.3-6.5 parts of glass fibre；
0.3-2.2 parts of silicon carbide whisker
0.5-3.8 parts of nano-titanium dioxide；
Compatilizer 2-10；
Antiseptic 0.05-2；
Lubricant 0.4-2.
2. the material of manufacture phone housing according to claim 1, which is characterized in that in terms of parts by weight, the material
Mainly include following components：
Acrylonitrile-ethylene propylene diene rubber -30 parts of styrene resin resin copolymer；
19 parts of polycarbonate；
20 parts of epoxy resin；
29 parts of nitrile rubber；
3.8 parts of glass fibre；
1.3 parts of silicon carbide whisker
2.1 parts of nano-titanium dioxide；
Compatilizer 6；
Antiseptic 1；
Lubricant 1.2.
3. the material of manufacture phone housing according to claim 1, which is characterized in that the diameter of the glass fibre is in 4-
Between 10 μm.
4. the material of manufacture phone housing according to claim 1, which is characterized in that the grain size of the nano-titanium dioxide
For 40-100nm.
5. it is according to claim 1 manufacture phone housing material, which is characterized in that the compatilizer be selected from styrene-
The random copolymer of maleic anhydride, the terpolymer of metacrylate-butadiene-styrene or acrylonitrile-butadiene-benzene
Vinyl Graft maleic anhydride.
6. the material of manufacture phone housing according to claim 1, which is characterized in that the antiseptic is selected from fragrant aldehyde, second
One or more of basic note grass aldehyde compound, quaternary ammonium salt compound or biguanide compound.
7. the material of manufacture phone housing according to claim 1, which is characterized in that the lubricant is selected from stearic acid
One or more of the double oleamides of calcium, tristerin, ethylene, polyethylene wax or silicone oil.
8. a kind of preparation method for the material that phone housing is manufactured according to claim 1-7 any one of them, which is characterized in that
Comprise the following steps：
（1）Each raw material is weighed according to regulation component；
（2）Silicon carbide whisker, nano-titanium dioxide, lubricant and antiseptic are put into homogenizer by proportioning, in 90-
High-speed stirred 4-8min at 110 DEG C；
（3）At normal temperatures acrylonitrile-ethylene propylene diene rubber-styrene resin resin copolymer, poly- carbon resin, asphalt mixtures modified by epoxy resin are added in by proportioning
Fat, nitrile rubber and compatilizer stir 5-10min；
（4）The component obtained after said mixture is put into extruder and carries out extruding pelletization, from glass fibre in extrusion
Mouth adds in glass fibre, mixture is made to keep obtaining polymer at a temperature of molten state, by the polymer obtained with strip
It squeezes out, is then cut to section, form particle to get to the material of the manufacture phone housing.
9. the preparation method of the material of manufacture phone housing according to claim 8, which is characterized in that step（2）In stir
Speed is mixed as 800-1000r/min.
10. the preparation method of the material of manufacture phone housing according to claim 8, which is characterized in that step（4）In
Extruder is single screw extrusion machine or double screw extruder, and makes 210-250 DEG C of the temperature of mixture holding molten state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810117227.2A CN108059744A (en) | 2018-02-06 | 2018-02-06 | A kind of material for manufacturing phone housing and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810117227.2A CN108059744A (en) | 2018-02-06 | 2018-02-06 | A kind of material for manufacturing phone housing and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108059744A true CN108059744A (en) | 2018-05-22 |
Family
ID=62134577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201810117227.2A Withdrawn CN108059744A (en) | 2018-02-06 | 2018-02-06 | A kind of material for manufacturing phone housing and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109135509A (en) * | 2018-08-21 | 2019-01-04 | 江苏金利电气有限公司 | A kind of high temperature high voltage resistant switchgear |
| CN110303633A (en) * | 2019-05-14 | 2019-10-08 | 嘉兴济铭商贸有限公司 | A kind of butadiene-styrene rubber mobile phone shell |
| CN112040049A (en) * | 2020-09-09 | 2020-12-04 | 东莞市群利电子科技有限公司 | Manufacturing method of mobile phone shell with efficient heat dissipation function |
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| CN102108201A (en) * | 2011-03-22 | 2011-06-29 | 东莞劲胜精密组件股份有限公司 | High-property degradable plastic and preparation method thereof |
| CN104877327A (en) * | 2015-05-21 | 2015-09-02 | 赵冯 | Preparation method of plastic mobile phone shell |
| CN107163538A (en) * | 2017-06-28 | 2017-09-15 | 合肥博之泰电子科技有限公司 | A kind of phone housing plastics and preparation method thereof |
| CN107383838A (en) * | 2017-09-26 | 2017-11-24 | 安徽酷米智能科技有限公司 | A kind of phone housing antibacterial heat polycarbonates composite |
| CN107652649A (en) * | 2017-09-26 | 2018-02-02 | 安徽酷米智能科技有限公司 | A kind of phone housing polycarbonate composite material |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108201A (en) * | 2011-03-22 | 2011-06-29 | 东莞劲胜精密组件股份有限公司 | High-property degradable plastic and preparation method thereof |
| CN104877327A (en) * | 2015-05-21 | 2015-09-02 | 赵冯 | Preparation method of plastic mobile phone shell |
| CN107163538A (en) * | 2017-06-28 | 2017-09-15 | 合肥博之泰电子科技有限公司 | A kind of phone housing plastics and preparation method thereof |
| CN107383838A (en) * | 2017-09-26 | 2017-11-24 | 安徽酷米智能科技有限公司 | A kind of phone housing antibacterial heat polycarbonates composite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109135509A (en) * | 2018-08-21 | 2019-01-04 | 江苏金利电气有限公司 | A kind of high temperature high voltage resistant switchgear |
| CN110303633A (en) * | 2019-05-14 | 2019-10-08 | 嘉兴济铭商贸有限公司 | A kind of butadiene-styrene rubber mobile phone shell |
| CN112040049A (en) * | 2020-09-09 | 2020-12-04 | 东莞市群利电子科技有限公司 | Manufacturing method of mobile phone shell with efficient heat dissipation function |
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Application publication date: 20180522 |