WO2014032252A1 - Electronic device housing and electronic device - Google Patents

Description

 Electronic device housing and electronic device

Technical field

 The present invention relates to the field of communication devices, and in particular to a fireproof, antistatic, impact resistant electronic device housing and an electronic device.

Background technique

 Explosion-proof walkie-talkies are walkie-talkies that can work in explosive environments. We know that walkie-talkies rely on electromagnetic waves to transmit signals, and the transmission of electromagnetic waves relies on the continuous conversion of electric and magnetic fields, which is prone to sparks during this conversion process. Compared with ordinary walkie-talkies, the lines of the explosion-proof walkie-talkie will be specially treated, and the places where sparks may occur during the conversion process will be shielded to prevent danger when used in an explosive environment. For example, the non-metallic machine surface of the explosion-proof walkie-talkie needs to be anti-static. Generally, anti-static is mainly used in explosive dust environment, that is, the structure that can prevent the ignition charge from being dangerous when the electrical equipment is maintained and cleaned. Therefore, IEC60079-0 stipulates that the surface resistance of the explosion-proof walkie-talkie should be less than 1GO; at the same time, it is also necessary to carry out FM Approvals and pass the fire test; etc. The inventors found most of the current process in the process of implementing the embodiments of the present invention. The non-metallic machine casing of the explosion-proof walkie-talkie meets the safety requirements of anti-static and explosion-proof in an explosive dust environment, but it fails to meet the required fire protection level at the same time and cannot meet the fire protection requirements.

Summary of the invention

 Embodiments of the present invention provide an electronic device housing and an electronic device, which are used in an explosive environment and can simultaneously meet the requirements of fireproof, impact resistant, and antistatic.

 In view of this, the embodiments of the present invention provide:

 An electronic device housing includes:

 An antistatic surface layer, a support layer connected to the antistatic surface layer;

 The antistatic surface layer is formed by mixing an amorphous material, an antistatic crystalline material and a flame retardant material;

 The support layer is formed by mixing an amorphous material, a crystalline material, and a flame retardant material; the antistatic surface layer material combination has a melting point lower than a melting point of the support layer material combination.

Further, the antistatic crystalline material in the antistatic surface layer has a melting point of 50 ° C to 200 ° C, and the crystalline material in the supporting layer has a melting point of 210 ° C to 340 ° C. Further, in the antistatic surface layer, the content percentage of the amorphous material is 40% to 80%, the content percentage of the antistatic crystalline material is 10% to 40%, and the content percentage of the flame retardant material is 5% to 30%.

 Optionally, in the antistatic surface layer, the content percentage of the amorphous material is 70%, the content percentage of the antistatic crystalline material is 20%, and the content percentage of the flame retardant material is 10%.

 Further, in the support layer, the content percentage of the amorphous material is 30% to 60%, the content percentage of the crystalline material is 30% to 70%, and the content percentage of the flame retardant material is 5% to 30%.

 Optionally, in the support layer, the content percentage of the amorphous material is 40%, the content percentage of the crystalline material is 40%, and the content percentage of the flame retardant material is 20%.

 Optionally, the amorphous material is a polycarbonate PC amorphous thermoplastic resin or an amorphous thermoplastic resin of acrylonitrile-butadiene-styrene ABS or polyphenylene ether PPO;

 The antistatic crystalline material of the antistatic surface layer comprises a crystalline thermoplastic polyester and a conductive material filled in the crystalline thermoplastic polyester, the crystalline thermoplastic polyester being a polyamide PA or a polyphthalic acid resin POM or polyethylene PE ;

 The crystalline material of the supported layer is a crystalline thermoplastic polyester of polybutylene terephthalate PBT or a polyethylene terephthalate plastic PET or polypropylene PP.

 Embodiments of the present invention also provide an electronic device including the electronic device housing as described above.

 Optionally, the electronic device is a walkie-talkie.

 It can be seen from the above technical solution that an electronic device housing and an electronic device provided by the embodiments of the present invention have a melting point lower than a melting point of the support layer material combination, and the temperature in the explosive environment reaches a certain temperature. To the extent, the anti-static surface material absorbs heat and melts quickly, protects the material with high melting point of the support layer, thereby ensuring that the support layer is not burned through, meeting the fireproof standard; the toughness of the amorphous material is combined with the high mechanical strength of the crystalline material to ensure that it is satisfied. Impact-resistant standard; At the same time, the anti-static crystalline material content in the anti-static surface layer meets the requirement that the surface resistance of the electronic device housing is less than 1G ohm, which can meet the requirements of fireproof, impact-resistant and anti-static at the same time, and is suitable for use in an explosive environment.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly described. It is obvious that the drawings in the following description are only one of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

 1 is a schematic diagram of an electronic device housing and an electronic device according to an embodiment of the present invention; and FIG. 2 is a partial enlarged view of the B portion shown in FIG.

detailed description

 Embodiments of the present invention provide an electronic device housing and an electronic device, which are used in an explosive environment and can simultaneously meet the requirements of fireproof, impact resistant, and antistatic.

 BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

 The details are described below separately.

 The embodiment of the present invention provides an electronic device housing, wherein the electronic device housing includes: an antistatic surface layer 1, a supporting layer 2 connected to the antistatic surface layer 1;

 The antistatic surface layer 1 is formed by mixing an amorphous material, an antistatic crystalline material and a flame retardant material;

 The support layer 2 is formed by mixing an amorphous material, a crystalline material and a flame retardant material; the melting point of the antistatic surface layer 1 material combination is lower than the melting point of the support layer 2 material combination.

 It can be understood that, in the embodiment of the present invention, the antistatic surface layer 1 is an outer layer of the casing, and the support layer 2 is an inner layer of the casing; the melting point of the antistatic surface layer 1 material combination is lower than The melting point of the material combination of the support layer 2, that is, the melting point of the outer material combination is lower than the melting point of the inner material combination. When the temperature in the explosive environment reaches a certain level, the outer material rapidly absorbs heat and melts, protecting the inner layer high. a material that melts to ensure that the inner layer is not burned through;

 In addition, amorphous materials are also called amorphous materials or glassy materials, which are a large class of rigid solids with high hardness and high viscosity coefficient comparable to crystalline materials;

In some embodiments, the antistatic surface layer 1 and the support layer 2 can be joined by two-color injection molding, wherein the two-color injection molding process is based on the IMD (In-Mold Decoration) process, and the two-color injection molding is also performed. That is, one part is realized by injection molding of two kinds of plastics. It is also conceivable that the anti-static surface layer 1 and the support layer 2 can also be formed by a double injection molding process, and no specific limitation is made here. Set.

 It can be seen from the above that, in the electronic device casing provided by the embodiment of the present invention, the melting point of the material combination of the antistatic surface layer 1 is lower than the melting point of the material combination of the supporting layer 2, and when the temperature in the explosive environment reaches a certain level, the antistatic surface layer 1 The material quickly absorbs heat and melts, protects the material with high melting point of the support layer 2, thereby ensuring that the support layer 2 is not burned through, and meets the fireproof requirement; the toughness of the amorphous material is combined with the high mechanical strength of the crystalline material to ensure that the impact resistance requirements are met; At the same time, the surface resistance of the electronic equipment housing is less than 1G ohm, which can meet the requirements of fireproof, impact and anti-static at the same time, and is suitable for use in explosive environments.

 1 is a schematic structural diagram of an electronic device housing according to an embodiment of the present invention. The figure includes an external schematic diagram of the electronic device and a cross-sectional view of the external AA direction of the electronic device. In the embodiment of the present invention, preferably, The electronic device housing adopts a two-color injection molding mechanism of the two materials, and the thickness of the support layer 2 is from 1 mm to 3 mm, the highest thickness of the antistatic surface layer 1 is from 1 mm to 3 mm, and the lowest thickness is from 0.5 mm to 1.5. Mm, can refer to FIG. 2 together, FIG. 2 is a partial enlarged view of the portion B shown in FIG. 1, wherein B1 is the thickness of the support layer 2, and B2 is the highest point of the antistatic surface layer 1 and the total thickness of the support layer 2, B3 is the lowest of the antistatic surface layer 1 and the total thickness of the support layer 2; optionally, in the electronic device housing provided by the embodiment of the invention, the thickness B1 of the support layer 2 may be 1.2 mm, and the highest of the antistatic surface layer 1 The total thickness B2 of the support layer 2 may be 2.6 mm, and the lowest point of the antistatic surface layer 1 and the total thickness B3 of the support layer 2 may be 2.0 mm. It is also conceivable that the embodiment of the present invention is for Bl, B2 and B3. Specific value As defined, comply with the appropriate thickness range.

 Among them, primary rubber (support layer 2) is fireproof and impact resistant material, fire rating requires UL94 5VA/3.0mm; secondary rubber (antistatic surface layer 1) is antistatic and fireproof material, static electricity requirement is surface resistance less than 1G Ohm, fire rating requires UL94 V-0/1.5mm; the anti-static surface layer 1 material combination has a melting point lower than the melting point of the support layer 2 material combination to meet the requirements of fireproof, impact and antistatic.

Understandably, UL is a shorthand for Underwriter Laboratories Inc. The UL Safety Laboratory is the most authoritative in the United States and the largest institution in the world for safety testing and identification. The UL 94 standard is the test method standard for the combustion properties of materials developed by Underwriters Laboratories. The UL94 plastics have a total of 6 fire ratings: HB, V-0, Vl, V-2, 5VB, 5VA; among them, UL94 5VA is The most rigorous testing method, the highest fire rating in plastic fire protection, generally Only for cutting-edge technology products such as satellites, airplanes, etc. UL94 5VA relates to the actual life of plastic products in the flame. The experiment requires a flame length of 127 mm, applying 5 times of combustion to the test sample, during which no droplets are allowed to drip, the test sample is not allowed to be significantly distorted, and no burned holes are produced. Regarding the test manners of other fireproof levels, the relevant standard content can be referred to, which is not described in detail in the embodiments of the present invention.

 Further, in the secondary glue (antistatic surface layer 1), the content percentage of the amorphous material is 40% to 80%, and the content percentage of the antistatic crystalline material is 10% to 40%, the flame retardant material The content percentage is 5% to 30%; in some embodiments, the content of the amorphous material may be 70%, and the content of the antistatic crystalline material may be 20%, the flame retardant material The content percentage may be 10%; in some embodiments, the content of the amorphous material may also be 50%, and the content of the antistatic crystalline material may be 30%, the content of the flame retardant material. The percentage may be 20%; it is easily conceivable that the above description of the specific content percentage of the amorphous material, the antistatic crystalline material and the flame retardant material in the antistatic surface layer 1 is only an approximate or comparative in some embodiments. The percentage of the content of the present invention is not limited in the embodiment of the present invention.

 The antistatic crystalline material has a melting point of 50 ° C to 200 ° C, and the main component thereof may be a polyamide PA (polyamide) crystalline thermoplastic polyester, also called nylon (nylon), which has a high mechanical strength. Heat resistant, low friction coefficient, and abrasion resistance; it is also conceivable that the antistatic crystalline material in the embodiment of the present invention may be PA or other antistatic crystalline thermoplastic resin such as PA6, PA66, polyfluorene. The aldehyde resin POM (Polyoxymethylene), polyethylene PE (polyethylene), etc., are not specifically limited in the embodiment of the present invention.

 In addition, in this embodiment, the antistatic crystalline material is mixed and filled with a conductive material, such as one or more of carbon black, carbon fiber, carbon nanotube, inherently dissipative polymer, etc.; for example, In the embodiment of the present invention, the antistatic crystalline material may be a PA plastic (also referred to as PA modified plastic) mixed with a conductive material, or may be a PE modified plastic; etc., it should be noted that one of the functions is to prevent fire The protective support layer 2 is protected against static electricity. The content of the antistatic crystalline material is mainly adjusted according to the type of the conductive material and the content thereof, so that the surface resistance of the electronic device housing is less than 1 G ohm.

Further, in the primary glue (support layer 2), the content of the amorphous material is 30% to 60%, the content percentage of the crystalline material is 30% to 70%, and the content of the flame retardant material is 100%. The fractional ratio is 5% to 30%; in some embodiments, the content of the amorphous material may be 40%, the content percentage of the crystalline material may be 40%, and the content percentage of the flame retardant material may be 20%; In some embodiments, the content of the amorphous material may also be 30%, the content of the crystalline material may be 60%, and the percentage of the flame retardant material may be 10%. It is readily conceivable that the above description of the specific percentage of amorphous material, crystalline material and flame retardant material in the support layer 2 is only an approximate or more usual percentage of content in certain embodiments, the practice of the invention This example does not limit this.

 Wherein, the melting point of the crystalline material in the support layer 2 is 210 ° C to 340 ° C, such as polybutylene terephthalate crystalline thermoplastic polyester, PBT is milky white translucent to opaque, crystallized Type of thermoplastic polyester, belonging to the polyester series; it is also conceivable that the crystalline material in the support layer 2 of the embodiment of the invention may be PBT or other crystalline thermoplastic resin, such as polyterpene phthalic plastic. PET (polyethylene terephthalate), polypropylene PP (polypropylene), etc., are not specifically limited in the embodiment of the present invention.

 Optionally, the amorphous material in the antistatic surface layer 1 and the support layer 2 may be polycarbonate PC (polycarbonate), referred to as PC engineering plastic, PC material is actually one of the engineering plastics we call, as the world PC is widely used in the range, PC has its own characteristics and advantages and disadvantages. PC is an amorphous thermoplastic resin with excellent comprehensive properties, excellent electrical insulation, extensibility, dimensional stability and chemical resistance. High strength, heat resistance and cold resistance; also has the advantages of self-extinguishing, flame retardant, non-toxic, colorable, etc.; it is also conceivable that the amorphous material in the embodiment of the invention may be PC or Other amorphous thermoplastic resins, such as Acrylonitrile Butadiene Styrene, Polyphenylene Oxide, and the like, are not specifically limited in the embodiment of the present invention.

 The electronic device housing provided by the embodiment of the present invention is described in a specific application scenario. In the application scenario, if the electronic device housing is used in an explosive dust environment, FM and Atex standard authentication is required. Among them, Atex is named after the French "Atmosphere Explosible", which is an instruction 94/9/EC (the equipment and protection system for potential explosive environment) involved in the CE mark, mainly for explosion-proof products;

In this application scenario, the contents of the electronic device housing that need to be authenticated mainly include fireproof, impact resistant, and antistatic tests: 1) About fire protection requirements:

 In an explosive dust environment, the level of dust protection of the enclosure is required, that is, the CSA C22.2 No.25-1966 clause is required, and the fire rating of CSA C22.2 No.25-1966 exceeds the UL 94 highest level of 5VA; When the flame height is as high as 127mm, the flame is removed by 15s for 15s, and the electronic device casing is tested. After 5 cycles, the test is completed, the rubber shell is not burned through, and the burning time is less than 60 seconds. It has been verified that the electronic device housing reaches the fire protection level of CSA C22.2 No.25-1966 for dust protection of the outer casing, and meets the fireproof standard;

 Among them, CSA is the abbreviation of Canadian Standards Association. It was founded in 1919 and is the first non-profit organization in Canada to develop industry standards. Products such as electronics and electrical appliances sold in the North American market require safety certification. Currently CSA is Canada's largest safety certification body and one of the world's most recognized safety certification bodies.

 2) About anti-static requirements:

 In an explosive dust environment, the surface of the electrical equipment needs to be anti-static, that is, the structure that the electrical equipment can prevent the ignition charge from being ignited under maintenance and cleaning; the surface resistance of the electronic equipment shell is verified to be less than That is to meet the static requirements of the explosion-proof standard IEC60079-0.

 3) About impact resistance requirements:

 It has been verified that the electronic device housing can withstand the impact of a 1kg steel ball falling vertically from a height of 0.7 m, that is, meeting the impact requirements of the explosion-proof standard IEC60079-0.

 In summary, it has been verified that the electronic device housing can meet the requirements of fireproof, impact-resistant and anti-static at the same time, and meet the certification standards of FM and Atex.

 It can be seen from the above that, in an electronic device casing provided by the embodiment of the present invention, the melting point of the material combination of the antistatic surface layer 1 is lower than the melting point of the material combination of the supporting layer 2, and when the temperature in the explosive environment reaches a certain level, the antistatic The surface layer 1 material absorbs heat and melts rapidly, and protects the high melting point material of the support layer 2, thereby ensuring that the support layer 2 is not burned through, meeting the fireproof requirement; the amorphous material has good toughness and the mechanical strength of the crystalline material is combined to ensure the impact resistance is satisfied. At the same time, the anti-static crystalline material content in the anti-static surface layer 1 meets the requirement that the surface resistance of the electronic device housing is less than 1G ohm, which can meet the requirements of fireproof, impact-resistant and anti-static at the same time, and is suitable for use in an explosive environment.

In addition, an embodiment of the present invention further provides an electronic device, including the electronic device housing as described above. The structure is illustrated as shown in the electronic device of FIG.

 Optionally, the electronic device is a walkie-talkie, such as a digital mobile wireless communication (DMR, DIGITAL MOBILE RADIO) explosion-proof walkie-talkie PD790Ex. It is also conceivable that the electronic device can also be an electrical (communication) device for other explosive environments. At the same time, the outer casing structure of the electronic device is also applicable to fields such as medical equipment;

 It has been verified that the DMR explosion-proof walkie-talkie PD790Ex with the above-mentioned housing can pass the CSA C22.2 N0.25-1966 certification standard, and can meet the requirements of fireproof, impact and anti-static, and is suitable for use in explosive environments.

 The electronic device housing and the electronic device provided by the present invention are described in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there are changes in the specific implementation manner and application range. In conclusion, the contents of this specification are not to be construed as limiting the invention.

Claims

Rights request 1. An electronic equipment housing, characterized in that it includes: Anti-static surface layer, a support layer connected to the anti-static surface layer; The anti-static surface layer is formed by a mixture of amorphous materials, anti-static crystalline materials and flame retardant materials. The support layer is formed by mixing amorphous materials, crystalline materials and flame retardant materials; the melting point of the anti-static surface layer material combination is lower than the melting point of the support layer material combination. 2. The housing according to claim 1, characterized in that it includes: The melting point of the antistatic crystalline material in the antistatic surface layer is 50°C to 200°C, and the melting point of the crystalline material in the support layer is 210°C to 340°C. 3. The housing according to claim 1 or 2, characterized in that it includes: In the anti-static surface layer, the content percentage of the amorphous material is 40% to 80%, the content percentage of the anti-static crystalline material is 10% to 40%, and the content percentage of the flame retardant material is 5% to 80%. 30%. 4. The housing according to claim 3, characterized in that it includes: In the anti-static surface layer, the content percentage of the amorphous material is 70%, the content percentage of the anti-static crystallized material is 20%, and the content percentage of the flame-retardant material is 10%. 5. The housing according to claim 1 or 2, characterized in that it includes: In the support layer, the content percentage of the amorphous material is 30% to 60%, the content percentage of the crystalline material is 30% to 70%, and the content percentage of the flame retardant material is 5% to 30%. 6. The housing according to claim 5, characterized in that it includes: In the support layer, the content percentage of the amorphous material is 40%, the content percentage of the crystalline material is 40%, and the content percentage of the flame retardant material is 20%. 7. The housing according to claim 1 or 2, characterized in that, The amorphous material is polycarbonate PC or acrylonitrile-butadiene-styrene ABS or polyphenylene ether Amorphous thermoplastic resin of PPO; The antistatic crystalline material of the antistatic surface layer includes crystalline thermoplastic polyester and a conductive material filled in the crystalline thermoplastic polyester. The crystalline thermoplastic polyester is polyamide PA or polyformic acid resin POM or polyethylene PE. ; The crystalline material of the supported layer is polybutylene terephthalate (PBT), polyterephthalate plastic PET or polypropylene PP, a crystalline thermoplastic polyester. 8. An electronic device, characterized by comprising an electronic device housing as claimed in claim 1. 9. The electronic device according to claim 8, characterized in that the electronic device is a walkie-talkie.