CN110698828B - Plastic composition for electronic product shell, plastic for electronic product shell, electronic product shell and preparation method thereof - Google Patents

Plastic composition for electronic product shell, plastic for electronic product shell, electronic product shell and preparation method thereof Download PDF

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CN110698828B
CN110698828B CN201810754919.8A CN201810754919A CN110698828B CN 110698828 B CN110698828 B CN 110698828B CN 201810754919 A CN201810754919 A CN 201810754919A CN 110698828 B CN110698828 B CN 110698828B
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plastic composition
plastic
electronic product
polycarbonate
cyclic olefin
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CN110698828A (en
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周维
张�雄
俞跃
汪杰
石任岚
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BYD Co Ltd
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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
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • 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
    • C08K2201/016—Additives defined by their aspect ratio
    • 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
    • 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
    • C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods
    • 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
    • C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers

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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)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to the field of plastics for electronic product shells, and discloses a plastic composition for electronic product shells, a plastic for electronic product shells, an electronic product shell and a preparation method thereof. The plastic composition comprises 40-80 wt% of polycarbonate, 1-20 wt% of cyclic olefin polymer, 10-30 wt% of flat glass fiber, 5-10 wt% of toughening agent and 1-10 wt% of compatilizer, wherein the intrinsic viscosity of the polycarbonate is 1.7-2.5 dl/g. The plastic injection molding product for the electronic product shell has small internal stress and excellent dimensional stability.

Description

Plastic composition for electronic product shell, plastic for electronic product shell, electronic product shell and preparation method thereof
Technical Field
The invention relates to the field of plastics for electronic product shells, in particular to a plastic composition for electronic product shells, a plastic for electronic product shells, an electronic product shell and a preparation method thereof.
Background
In the field of manufacturing parts of automobiles, household electric appliances, industrial machines, and the like, it is necessary to strongly bond a metal and a resin together. The nano processing technology (NMT) is a metal and plastic integrated combination technology, and plastic is directly injected and molded on the metal surface by nano processing the metal surface, so that a gold-plastic integrated molded product is obtained.
Polycarbonate (PC) is a noncrystalline engineering plastic having good impact resistance, surface gloss, etc. However, the polycarbonate material has the defect of poor stress cracking resistance, and when the polycarbonate material is used for a front shell of a mobile phone, the internal stress of an injection molding product is large, and the dimensional stability needs to be further improved.
Disclosure of Invention
The invention aims to solve the problems of large internal stress and poor dimensional stability of an injection molding product when polycarbonate material is used for a front shell of a mobile phone in the prior art, and provides a plastic composition for an electronic product shell, plastic for the electronic product shell, the electronic product shell and a preparation method thereof.
The inventor of the invention has found through intensive research that the injection molding product has the advantages of good planeness, small internal stress of the injection molding product and the like by selecting the polycarbonate resin with the intrinsic viscosity of 1.7-2.5dl/g and simultaneously selecting the flat glass fiber for reinforcement.
The reason is presumed to be: because the polycarbonate resin with the intrinsic viscosity of 1.7-2.5dl/g has better fluidity, the internal stress generated by the injection molding process at the position with larger stress (such as the position of a weld mark) is reduced, and because flat glass fiber is selected, the injection molded product has better flatness, and the internal stress causing buckling deformation of the injection molded product is reduced.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a plastic composition for an electronic product housing, the plastic composition comprising 40 to 80 wt% of polycarbonate, 1 to 20 wt% of a cyclic olefin polymer, 10 to 30 wt% of a flat glass fiber, 5 to 10 wt% of a toughening agent, and 1 to 10 wt% of a compatibilizing agent, wherein the polycarbonate has an intrinsic viscosity of 1.7 to 2.5 dl/g.
Preferably, the plastic composition contains 50 to 80 weight percent of polycarbonate, 5 to 15 weight percent of cyclic olefin polymer, 10 to 25 weight percent of flat glass fibers, 2 to 8 weight percent of toughening agent and 2 to 8 weight percent of compatilizer; more preferably, the plastic composition contains 56-72 wt% polycarbonate, 5-10 wt% cyclic olefin polymer, 10-20 wt% flat glass fiber, 6-8 wt% toughening agent, and 2-4 wt% compatibilizing agent.
Preferably, the polycarbonate has an intrinsic viscosity of 1.9 to 2.2 dl/g.
Preferably, the cyclic olefin polymer has a cyclic olefin content of 30 to 50 mol%;
more preferably, the cyclic olefin content of the cyclic olefin polymer is from 35 to 45 mol%.
Preferably, the flat glass fibers have a flatness ratio of 2-4: 1.
Preferably, the flat glass fiber is a flat glass fiber with the surface coated with sizing agent;
more preferably, the slurry is a polyurethane-based compound.
Preferably, the toughening agent is one or more of acrylic rubber, a silicone rubber/acrylic rubber composite and an ethylene-methyl acrylate binary copolymer;
more preferably, the toughening agent is an ethylene-methyl acrylate copolymer;
more preferably, the toughening agent is an ethylene-methyl acrylate binary copolymer, and the ester content in the ethylene-methyl acrylate binary copolymer is 10-20 wt%.
Preferably, the compatibilizer is one or more of a hydrogenated styrene-butadiene block copolymer (SEBS), an ethylene-vinyl acetate copolymer (EVA), an ethylene acrylic acid copolymer (EAA), ethylene-ethyl acrylate (EEA), an acrylic-type compatibilizer, an oxazoline-type compatibilizer, a maleic anhydride grafted polyolefin, and a polyethylene grafted polycarbonate copolymer;
more preferably, the compatibilizer is a maleic anhydride grafted polyolefin and/or a polyethylene grafted polycarbonate copolymer.
Preferably, the plastic composition further comprises 1-2 wt.% of a lubricant;
more preferably, the lubricant is one or more of stearic acid, wax, oleamide, silicone oil lubricant, and hyperbranched high molecular polymer.
Preferably, the plastic composition further comprises 0.2 to 1 wt.% of an antioxidant;
more preferably, the antioxidant is one or more of aromatic amine antioxidant, thioether antioxidant and sterically hindered phenol antioxidant.
Preferably, the plastic composition further comprises 0.2 to 1 wt% of an ultraviolet absorber;
more preferably, the ultraviolet absorber is a benzotriazole-based ultraviolet absorber.
The second aspect of the present invention provides a plastic for electronic product housings, which is obtained by mixing the plastic composition for electronic product housings of the present invention and then melt-extruding the mixture.
The third aspect of the present invention provides a method for preparing a plastic for electronic product housings, which comprises the step of mixing the plastic composition for electronic product housings of the present invention and then melt-extruding the mixture.
A fourth aspect of the present invention provides an electronic product casing obtained by injection molding the plastic for an electronic product casing of the present invention on a metal base.
Preferably, the electronic product housing is a mobile phone housing.
Through the technical scheme, the invention has the following advantages.
1) By selecting the polycarbonate resin with the intrinsic viscosity of 1.7-2.5dl/g and simultaneously selecting the flat glass fiber for reinforcement, the injection molding product has the advantages of good planeness, small internal stress of the injection molding product and the like.
2) Cyclic olefin polymers (COC) are added to the composition, and the COC has both properties of polyolefin resin and non-crystalline resin so that it has good chemical resistance, and has low anisotropy due to the bulky side chains of the COC, while ensuring its dimensional stability.
3) And the flat glass fiber with the surface sized has the characteristic of good bonding force with matrix resin, and is favorable for further improving the planeness of injection molding products.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a plastic composition for electronic product shells, which comprises 40-80 wt% of polycarbonate, 1-20 wt% of cyclic olefin polymer, 10-30 wt% of flat glass fiber, 5-10 wt% of toughening agent and 1-10 wt% of compatilizer, wherein the intrinsic viscosity of the polycarbonate is 1.7-2.5 dl/g.
In the invention, the electronic products include mobile phones, tablets, computers and other electronic products.
According to the present invention, from the viewpoints of further improving the flatness of an injection molded product, reducing the internal stress of the injection molded product, and improving the dimensional stability of the injection molded product, it is preferable that the plastic composition contains 50 to 80% by weight of polycarbonate, 5 to 15% by weight of cyclic olefin polymer, 10 to 25% by weight of flat glass fiber, 2 to 8% by weight of a toughening agent, and 2 to 8% by weight of a compatibilizing agent; more preferably, the plastic composition contains 56-72 wt% polycarbonate, 5-10 wt% cyclic olefin polymer, 10-20 wt% flat glass fiber, 6-8 wt% toughening agent, and 2-4 wt% compatibilizing agent.
According to the invention, the polycarbonate requires the use of a polycarbonate having an intrinsic viscosity of 1.7 to 2.5dl/g, preferably 1.9 to 2.2 dl/g. The polycarbonate with the intrinsic viscosity has the characteristic of good fluidity, and can improve the planeness of injection products and reduce the internal stress of the injection products through the synergistic effect with flat glass fibers, thereby improving the dimensional stability of the injection products.
When the intrinsic viscosity of the polycarbonate is less than 1.7dl/g, there is a problem that the toughness of the injection molded product is poor, and when the intrinsic viscosity of the polycarbonate is more than 2.5dl/g, the processing is not facilitated and the internal stress of the injection molded product is excessive.
In the present invention, the intrinsic viscosity of polycarbonate was measured at a constant temperature of 25 ℃ using an Ubbelohde viscometer, and during the measurement, polycarbonate was diluted to a solid content of 0.05 g/ml and the solvent was methylene chloride.
The polycarbonate may be obtained commercially, and may be, for example, IV1900, IV2200, and IV1900R available from taiwan, or PJ3022 and PJ3025 available from korea.
According to the present invention, the plastic composition for electronic product housings further comprises a cyclic olefin polymer, and by adding a cyclic olefin polymer (COC) to the plastic composition for housings, the COC has both properties of a polyolefin resin and a non-crystalline resin so as to have good chemical resistance, and has low anisotropy due to the bulky side chains of the COC, while ensuring dimensional stability.
Preferably, the cyclic olefin content of the above cyclic olefin polymer is 30 to 50 mol%; more preferably, the cyclic olefin content of the cyclic olefin polymer is from 35 to 45 mol%. By making the content of the cyclic olefin in the cyclic olefin polymer within the above range, it is advantageous to ensure dimensional stability. In addition, when the content of the cyclic olefin is higher than the above range, melt flowability of the material is affected.
Further, the above cyclic olefin polymer can be obtained by a synthesis method which is conventional in the art, or can be obtained commercially, and for example, may be an APL series such as APL6013T, APL6015T, and the like which are available from mitsui chemistry.
According to the present invention, the glass fiber used in the plastic composition for electronic product housings is a flat glass fiber, preferably, the flat glass fiber has a flat ratio of 2-4: 1, more preferably, the flat glass fiber has a flat ratio of 3-4: 1. Through selecting the flat glass fiber within the range of the flat ratio, the flatness of the injection molding product can be further improved, the internal stress of the injection molding product is reduced, and the dimensional stability of the injection molding product is further improved. Further, the thickness of the flat glass fiber length is preferably 6 to 8 μm.
In addition, from the viewpoint of further improving the bonding force with the matrix resin and improving the flatness of the injection molded article, it is preferable that the flat glass fibers are flat glass fibers having a surface coated with a sizing agent. The slurry may be, for example, one or more of an aliphatic lipid oligomer and a coupling agent; preferably, the slurry is a polyurethane compound and/or a silane coupling agent; more preferably, the slurry is a polyurethane-based compound.
According to the present invention, preferably, the toughening agent is one or more of acrylic rubber, silicone rubber/acrylic rubber composite and ethylene-methyl acrylate binary copolymer; more preferably, the toughening agent is an ethylene-methyl acrylate copolymer; further preferably, the toughening agent is an ethylene-methyl acrylate binary copolymer, and the ester content in the ethylene-methyl acrylate binary copolymer is 10-20 wt%.
According to the present invention, preferably, the compatibilizer is one or more of SEBS, EVA, EAA, EEA, acrylic-type compatibilizer, oxazoline-type compatibilizer, maleic anhydride-grafted polyolefin, and polyethylene-grafted polycarbonate copolymer; more preferably, the compatibilizer is a maleic anhydride grafted polyolefin and/or a polyethylene grafted polycarbonate copolymer; further preferably, the compatibilizer is a polyethylene grafted polycarbonate copolymer.
Examples of the compatibilizer include KAYABRID available from Guangzhou Xinglu chemical Co., Ltd, and CMG9801 and CMG5804 available from Jiangsu Co., Ltd, which are easy compatibilizers.
In the invention, the chemical resistance and the dimensional stability of the plastic are further improved by adding the cyclic olefin polymer into the plastic composition and leading the cyclic olefin polymer to have good compatibility with the matrix resin polycarbonate through the compatilizer.
According to the invention, the plastic composition preferably also contains 1 to 2 wt.% of a lubricant. By using the lubricant in the plastic composition for the electronic product shell, the advantages of improved material processability, good surface gloss and the like are achieved.
Preferably, the lubricant is one or more of stearic acid, wax, oleamide, silicone oil lubricant, and hyperbranched high-molecular polymer.
According to the invention, the plastic composition preferably also contains 1 to 2 wt.% of an antioxidant. By using the antioxidant in the plastic composition for electronic product housings, oxidation can be prevented and the service life can be prolonged.
Preferably, the antioxidant is one or more of aromatic amine antioxidant, thioether antioxidant and sterically hindered phenol antioxidant.
According to the invention, the plastic composition preferably also contains 1 to 2 wt.% of an ultraviolet absorber. The ultraviolet absorber may be various substances commonly used in the art for absorbing ultraviolet rays, and may be, for example, a benzotriazole-based ultraviolet absorber.
The second aspect of the present invention provides a plastic for electronic product housings, which is obtained by mixing the plastic composition for electronic product housings of the present invention and then melt-extruding the mixture.
The above-mentioned mixing may be carried out, for example, by mixing the components other than the flat glass fibers in a high-speed mixer at a rotation speed of 200-600rpm for 1-3min to obtain a mixture. The melt extrusion may be performed, for example, by melt extrusion in a twin-screw extruder, and specifically, the mixture obtained as described above may be fed mainly and the flat glass fiber may be fed sideways, and the mixture may be extruded and pelletized to obtain pellets.
The third aspect of the present invention provides a method for preparing a plastic for electronic product housings, which comprises the step of mixing the plastic composition for electronic product housings of the present invention and then melt-extruding the mixture.
Similarly, the above-mentioned mixing may be carried out, for example, by mixing the components other than the flat glass fibers in a high-speed mixer at a rotation speed of 200 and 600rpm for 1 to 3 minutes to obtain a mixture. The melt extrusion may be performed, for example, by melt extrusion in a twin-screw extruder, and specifically, the mixture obtained as described above may be fed mainly and the flat glass fiber may be fed sideways, and the mixture may be extruded and pelletized to obtain pellets.
A fourth aspect of the present invention provides an electronic product casing obtained by injection molding the plastic for an electronic product casing of the present invention on a metal base.
The injection molding can be carried out, for example, by adding the plastic for electronic product housings of the present invention to an injection molding machine, placing the plastic in a metal substrate, and insert-molding the plastic, and the specific conditions and methods thereof are well known in the art and will not be described herein in detail.
The metal matrix may be various metals commonly used for electronic product housings, and may be, for example, stainless steel, aluminum, or an aluminum alloy, etc.
Preferably, the electronic product housing further has a decorative layer. The decorative layer can be obtained, for example, by PVD decoration of the plastic surface of the injection-molded part.
The present invention will be described in detail below by way of examples, but the present invention is not limited to the following examples.
Example 1
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for a mobile phone case are shown in table 1, and the types of raw materials are shown below.
Polycarbonate resin: PJ3022 available from Korea as a three-culture product and having an intrinsic viscosity of 2.2dl/g
Cyclic olefin polymer: APL6013T, available from Mitsui Chemicals, having a cyclic olefin content of 40 mol% in the cyclic olefin polymer;
flat glass fibers: 307AT from Chongqing International composite Co., Ltd, with a flatness ratio of 4: 1 and a thickness of 6-8 μm;
a toughening agent: BF-E available from sumitomo chemical, with ethylene-methyl acrylate bipolymer, ester content of 16% by weight);
a compatilizer: KAYABRID available from Guangzhou Xinglu chemical Co., Ltd, which comprises maleic anhydride-grafted polyolefin;
antioxidant: n445 available from basf;
lubricant: EF available from clariant.
2) Preparation of plastic for mobile phone shell
The components except for the flat glass fiber were mixed at 200rpm for 2min and further at 400rpm for 1min to obtain a mixture. Then, the mixture obtained above was fed mainly into a twin-screw extruder, and flat glass fibers were fed sideways, and extrusion and pelletization were carried out to obtain plastic pellets a1 for cell phone cases.
3) Preparation of mobile phone shell
Adding the part of the plastic for the mobile phone shell obtained in the step 2) into an injection molding machine, putting a metal substrate (made of aluminum alloy and having a thickness of 0.5mm), and performing insert injection molding to obtain a mobile phone shell S1, wherein the injection molding conditions are as follows: the temperature is 300 ℃, and the injection pressure is 1800kg/cm2The injection speed was 250mm/s, and the dwell time was 5 s.
Example 2
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for a mobile phone case are shown in table 1, and the types of raw materials are the same as in step 1) of example 1.
2) Preparation of plastic for mobile phone shell
The procedure was carried out in the same manner as in step 2) of example 1 to obtain plastic pellets A2 for a cell phone case.
3) Preparation of mobile phone shell
The procedure was carried out in the same manner as in step 3) of example 1 to obtain a cell phone case S2.
Example 3
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for a mobile phone case are shown in table 1, and the types of raw materials are the same as in step 1) of example 1.
2) Preparation of plastic for mobile phone shell
The procedure was carried out in the same manner as in step 2) of example 1 to obtain plastic pellets A3 for a cell phone case.
3) Preparation of mobile phone shell
The procedure was carried out in the same manner as in step 3) of example 1 to obtain a cell phone case S3.
Example 4
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for a mobile phone case are shown in table 1, and the types of raw materials are the same as in step 1) of example 1.
2) Preparation of plastic for mobile phone shell
The procedure was carried out in the same manner as in step 2) of example 1 to obtain plastic pellets A4 for a cell phone case.
3) Preparation of mobile phone shell
The same procedure as in step 3) of example 1 was carried out to obtain a cell phone case S4.
Example 5
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for a cell phone case are shown in table 1, and the raw materials are the same as in step 1) of example 1 except that a cyclic olefin polymer having a cyclic olefin content of 45 mol% (APL 6015T available from mitsui chemical) was used as the cyclic olefin polymer, and a flat glass fiber having a flat ratio of 3: 1 (available from chongqing international composite material co., ltd 303T) was used as the flat glass fiber.
2) Preparation of plastic for mobile phone shell
The procedure was carried out in the same manner as in step 2) of example 1 to obtain plastic pellets A5 for a cell phone case.
3) Preparation of mobile phone shell
The procedure was carried out in the same manner as in step 3) of example 1 to obtain a cell phone case S5.
Example 6
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for cell phone case are shown in table 1, and the types of raw materials are the same as in step 1) of example 1 except that a polycarbonate resin having an intrinsic viscosity of 1.9dl/g (IV 1900R available from taiwan as light-emitting material) was used as the polycarbonate resin.
2) Preparation of plastic for mobile phone shell
The procedure was carried out in the same manner as in step 2) of example 1 to obtain plastic pellets A6 for a cell phone case.
3) Preparation of mobile phone shell
The procedure was carried out in the same manner as in step 3) of example 1 to obtain a cell phone case S6.
Example 7
1) Plastic composition for mobile phone shell and content thereof
The components and contents of the plastic composition for cell phone cases are shown in table 1, and the types of raw materials were the same as in step 1) of example 1, except that a polycarbonate resin having an intrinsic viscosity of 2.5dl/g (available from korean mitsui PJ3025) was used as the polycarbonate resin.
2) Preparation of plastic for mobile phone shell
The procedure was carried out in the same manner as in step 2) of example 1 to obtain plastic pellets A7 for a cell phone case.
3) Preparation of mobile phone shell
The procedure was carried out in the same manner as in step 3) of example 1 to obtain a cell phone case S7.
Comparative example 1
The procedure of example 1 was followed, except that the polycarbonate resin had an intrinsic viscosity of 2.6dl/g (available from Sanyo PJ3026, Korea), and plastic pellets for cell phone cases D1 and cell phone case DS1 were similarly obtained.
Comparative example 2
The procedure was followed as in example 1 except that the polycarbonate resin had an intrinsic viscosity of 1.6dl/g (available from Taiwan, China), and plastic pellets D2 for cell phone cases and DS2 for cell phone cases were similarly obtained.
Comparative example 3
The procedure of example 1 was repeated, except that ordinary glass fiber (purchased from jumbo stone, ltd, china 510H, and having a cylindrical shape) was used in place of the flat glass fiber, to obtain plastic pellets D3 for a cell phone case and a cell phone case DS3 in the same manner.
Comparative example 4
The procedure of example 1 was followed, except that the cyclic olefin polymer and the compatibilizer were replaced with a polycarbonate resin, to obtain plastic pellets for a cell phone case D4 and a cell phone case DS4 in the same manner.
Test example 1
Plastic pellets A1-A7 and D1-D4 for cell phone cases obtained in the above examples and comparative examples were injection-molded into test specimens to test mechanical properties. The test methods are shown below, and the results are shown in table 1.
Melt index test method: ASTM D1238, test conditions: 300 ℃ and 5 kg.
The impact strength test method comprises the following steps: ISO 179
The method for testing tensile strength and elongation at break comprises the following steps: ISO 527-2
The bending strength and the bending modulus test method comprises the following steps: ISO 178
Figure GDA0003075836710000131
Test example 2
2mL of edible oil was uniformly applied to the surfaces of the plastic layers of the cell phone cases S1-S7 and DS1-DS4 obtained in the above examples and comparative examples, and the cracking of the plastic was observed after 24 hours and 48 hours, respectively.
The mobile phone shells obtained by the method of the invention in the embodiments 1-7 have no crack after being coated with the edible oil for 24 hours and 48 hours, and compared with the mobile phone shells obtained by the method of the invention in the comparative example 1, the welding crack position has slight crack after being coated with the edible oil for 24 hours, but after 48 hours, the crack can be obviously deepened at the welding crack position of the manufactured part, and meanwhile, the welding crack position is taken as a starting point to diffuse outwards, so that slight crack appears; similarly, comparative example 2 is that slight cracks appeared at the weld positions 24h after the edible oil was applied, but after 48 h, the cracks appeared clearly deepened at the weld positions of the manufactured parts, and slight cracks appeared by spreading outward from the weld positions as starting points; comparative example 3 is that the weld mark position has obvious cracking after edible oil is coated for 24h, and slight cracking occurs when the weld mark position is taken as a starting point and is diffused outwards; comparative example 4 is a case where the weld position was significantly cracked after applying the edible oil for 24 hours, and also significant cracks were diffused outward from the weld position as a starting point, and the entire appearance was covered with cracks.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (23)

1. The plastic composition for the electronic product shell is characterized by comprising 40-80 wt% of polycarbonate, 1-20 wt% of cyclic olefin polymer, 10-30 wt% of flat glass fiber, 5-10 wt% of toughening agent and 1-10 wt% of compatilizer, wherein the intrinsic viscosity of the polycarbonate is 1.7-2.5dl/g, and the flat ratio of the flat glass fiber is 2-4: 1.
2. The plastic composition of claim 1, wherein the plastic composition comprises 50-80 wt% polycarbonate, 5-15 wt% cyclic olefin polymer, 10-25 wt% flat glass fiber, 5-8 wt% toughening agent, and 2-8 wt% compatibilizing agent.
3. The plastic composition of claim 2, wherein the plastic composition comprises 56-72 wt% polycarbonate, 5-10 wt% cyclic olefin polymer, 10-20 wt% flat glass fiber, 6-8 wt% toughening agent, and 2-4 wt% compatibilizing agent.
4. The plastic composition of claim 1, wherein the polycarbonate has an intrinsic viscosity of 1.9 to 2.2 dl/g.
5. The plastic composition according to any one of claims 1 to 4, wherein the cyclic olefin content in the cyclic olefin polymer is 30 to 50 mol%.
6. The plastic composition of claim 5, wherein the cyclic olefin polymer has a cyclic olefin content of 35 to 45 mol%.
7. The plastic composition according to any one of claims 1 to 4, wherein the flat glass fiber is a flat glass fiber whose surface is coated with a sizing agent.
8. The plastic composition of claim 7, wherein the slurry is a polyurethane-based compound.
9. The plastic composition of any of claims 1-4, wherein the toughening agent is one or more of an acrylic rubber, a silicone rubber/acrylic rubber composite, and an ethylene-methyl acrylate copolymer.
10. The plastic composition of claim 9, wherein the toughening agent is an ethylene-methyl acrylate copolymer.
11. The plastic composition of claim 10, wherein the toughening agent is an ethylene-methyl acrylate copolymer and the ester content of the ethylene-methyl acrylate copolymer is 10-20 wt%.
12. The plastic composition of any of claims l-4, wherein the compatibilizer is one or more of a hydrogenated styrene-butadiene block copolymer, an ethylene-vinyl acetate copolymer, an ethylene acrylic acid copolymer, an ethylene ethyl acrylate, an acrylic-type compatibilizer, an oxazoline-type compatibilizer, a maleic anhydride grafted polyolefin, and a polyethylene grafted polycarbonate copolymer.
13. The plastic composition of claim 12, wherein the compatibilizer is a maleic anhydride grafted polyolefin and/or a polyethylene grafted polycarbonate copolymer.
14. The plastic composition according to any one of claims 1-4, wherein the plastic composition further comprises 1-2 wt.% of a lubricant.
15. The plastic composition of claim 14, wherein the lubricant is one or more of stearic acid, a wax, an oleamide, a silicone oil lubricant, and a hyperbranched high polymer.
16. The plastic composition according to any of claims 1-4, wherein the plastic composition further comprises 0.2-1 wt.% of an antioxidant.
17. The plastic composition of claim 16, wherein the antioxidant is one or more of an aromatic amine antioxidant, a thioether antioxidant, a sterically hindered phenol antioxidant, and a benzotriazole ultraviolet absorber.
18. The plastic composition according to any one of claims 1 to 4, wherein the plastic composition further comprises 0.2 to 1 wt% of an ultraviolet absorber.
19. The plastic composition of claim 18, wherein the ultraviolet absorber is a benzotriazole-based ultraviolet absorber.
20. A plastic for electronic product housings, which is obtained by mixing the plastic composition for electronic product housings according to any one of claims 1 to 19 and then melt-extruding the mixture.
21. A method for preparing a plastic for electronic product housings, comprising the step of mixing the plastic composition for electronic product housings of any one of claims 1 to 19 and then melt-extruding the mixture.
22. An electronic product casing obtained by injection molding the plastic for electronic product casings of claim 20 on a metal base.
23. An electronics housing according to claim 22, wherein the electronics housing is a cell phone housing.
CN201810754919.8A 2018-07-10 2018-07-10 Plastic composition for electronic product shell, plastic for electronic product shell, electronic product shell and preparation method thereof Active CN110698828B (en)

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