Polycarbonate composition, housing, terminal and method for preparing housing

Abstract

The present disclosure relates to a polycarbonate composition, a shell, a terminal and a method for preparing the shell, wherein the polycarbonate composition comprises: polycarbonate, a first modifier and a second modifier; wherein the first modifier is used to improve the fluidity of the polycarbonate; and the second modifier is at least used to improve the temperature resistance of the polycarbonate. The embodiments of the present disclosure improve the fluidity and temperature resistance of the polycarbonate by using the first modifier and the second modifier.

Description

Technical Field

[0001] The present disclosure relates to the field of polymer compound compositions, and in particular to a polycarbonate composition, a shell, a terminal, and a method for preparing the shell. Background Art

[0002] Polycarbonate is widely used in the field of consumer electronics due to its good impact resistance, electrical properties, dimensional stability and other advantages. Polycarbonate is an amorphous polymer. After melting, the melt viscosity is high, the fluidity is poor, and there is a problem of difficult processing. In practical applications, it needs to undergo flow modification to meet processing requirements. Especially in the field of consumer electronic equipment with high fluidity requirements. In the field of consumer electronic equipment, with the development of lightweight electronic equipment, the thickness of plastic parts is getting thinner and thinner. Improving the fluidity of polycarbonate can suppress the appearance defects of floating fibers, flow marks, stress marks and other appearance defects on the shell of electronic equipment. However, in practical applications, while adding modifiers to improve the fluidity of polycarbonate, it will also reduce the temperature resistance of polycarbonate. Summary of the invention

[0003] The present disclosure provides a polycarbonate composition, a housing, a terminal and a method for preparing the housing.

[0004] According to a first aspect of an embodiment of the present disclosure, a polycarbonate composition is provided, including: a polycarbonate composition, characterized in that the polycarbonate composition comprises:

[0005] Polycarbonate, a first modifier, and a second modifier;

[0006] Wherein, the first modifier is used to improve the fluidity of the polycarbonate;

[0007] The second modifier is at least used to improve the temperature resistance of the polycarbonate.

[0008] In some embodiments, the second modifier comprises: phenyl methacrylate-styrene-acrylonitrile copolymer and / or hyperbranched polyester;

[0009] The first modifier includes: phosphate ester.

[0010] In some embodiments, the polycarbonate composition further comprises:

[0011] Impact modifier; wherein the impact modifier comprises at least one of the following:

[0012] Ethylene-methyl acrylate copolymer, methyl methacrylate-butadiene-styrene terpolymer, silicone-acrylate rubber or polyolefin elastomer.

[0013] In some embodiments, the polycarbonate composition further comprises:

[0014] Additives; wherein the additives include at least one of the following:

[0015] Antioxidants, release agents, lubricants, colorants, fillers, UV stabilizers, flame retardants or antistatic agents.

[0016] In some embodiments, the polycarbonate composition comprises:

[0017] 60-95wt% polycarbonate;

[0018] 0.5-4wt% of the phosphate ester;

[0019] 0.5-10wt% of the phenyl methacrylate-styrene-acrylonitrile copolymer;

[0020] 0.1 to 5 wt% of the hyperbranched polyester;

[0021] 1 to 15% wt% of the impact modifier, and

[0022] 0.1 to 10 wt% of the additive.

[0023] In some embodiments, the polycarbonate composition comprises:

[0024] 0.5-5%wt% of the phenyl methacrylate-styrene-acrylonitrile copolymer;

[0025] and / or;

[0026] 1 to 3% by weight of hyperbranched polyester.

[0027] In some embodiments, the phosphate ester comprises: triphenyl phosphate, and / or, resorcinol bis(diphenyl phosphate).

[0028] According to a second aspect of the embodiments of the present disclosure, there is provided a housing made of the polycarbonate composition described in the embodiments of the first aspect.

[0029] According to a third aspect of the embodiments of the present disclosure, there is provided a mobile terminal, comprising the housing according to the embodiment of the second aspect.

[0030] According to a fourth aspect of an embodiment of the present disclosure, there is provided a method for preparing a housing, comprising:

[0031] Mixing polycarbonate, a first modifier and a second modifier to obtain a polycarbonate composition; wherein the first modifier is used to improve the fluidity of the polycarbonate; and the second modifier is at least used to improve the temperature resistance of the polycarbonate;

[0032] The polycarbonate composition is formed into the housing.

[0033] In some embodiments, forming the polycarbonate composition into the housing comprises:

[0034] melting the polycarbonate composition;

[0035] The polycarbonate composition in a molten state is solidified to obtain the shell.

[0036] In some embodiments, the second modifier comprises: phenyl methacrylate-styrene-acrylonitrile copolymer and / or hyperbranched polyester;

[0037] The first modifier includes: phosphate ester.

[0038] In some embodiments, the method further comprises:

[0039] An impact modifier is mixed with the polycarbonate, the first modifier and the second modifier; wherein the impact modifier comprises at least one of the following:

[0040] Ethylene-methyl acrylate copolymer, methyl methacrylate-butadiene-styrene terpolymer, silicone-acrylate rubber or polyolefin elastomer.

[0041] In some embodiments, the method further comprises:

[0042] Adding additives; wherein the additives include at least one of the following:

[0043] Antioxidants, release agents, lubricants, colorants, fillers, UV stabilizers, flame retardants or antistatic agents.

[0044] In some embodiments, the polycarbonate composition comprises:

[0045] 60-95wt% polycarbonate;

[0046] 0.5-4wt% of the phosphate ester;

[0047] 0.5-10wt% of the phenyl methacrylate-styrene-acrylonitrile copolymer;

[0048] 0.1 to 5 wt% of the hyperbranched polyester;

[0049] 1 to 15% wt% of the impact modifier, and

[0050] 0.1 to 10 wt% of the additive.

[0051] In some embodiments, the phosphate ester comprises: triphenyl phosphate, and / or, resorcinol bis(diphenyl phosphate).

[0052] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0053] As can be seen from the above embodiments, the present disclosure improves the fluidity of polycarbonate by using the first modifier, so that the fluidity of the polycarbonate composition meets the processing requirements. The second modifier enhances the problem of reduced temperature resistance of polycarbonate caused by the use of the first modifier. The second modifier further improves the temperature resistance of polycarbonate on the basis of ensuring the fluidity of polycarbonate. Therefore, through the use of the first modifier and the second modifier, the fluidity and temperature resistance of polycarbonate are improved at the same time.

[0054] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0056] Figure 1 is a schematic diagram of the appearance structure of a housing according to an exemplary embodiment;

[0057] Figure 2 It is a schematic flow chart of a method for preparing a shell according to an exemplary embodiment. DETAILED DESCRIPTION

[0058] Here, exemplary embodiments will be described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are only examples of compositions or methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0059] In the description of the present disclosure, it is to be understood that, except in the operating examples or unless otherwise specified, all numbers indicating amounts, percentages, etc. in the specification are to be understood as being modified by the term "about" in all cases.

[0060] The present disclosure provides a polycarbonate composition, wherein the polycarbonate composition comprises:

[0061] Polycarbonate, a first modifier, and a second modifier;

[0062] Wherein, the first modifier is used to improve the fluidity of the polycarbonate;

[0063] The second modifier is at least used to improve the temperature resistance of the polycarbonate.

[0064] Without limitation, the first flow improver can improve the flowability of polycarbonate by reducing the intermolecular forces of polycarbonate.

[0065] In some embodiments, the first modifier and the second modifier are both flow modifiers. In this case, the second modifier can be used to improve the fluidity of the polycarbonate in addition to improving the temperature resistance of the polycarbonate.

[0066] Generally, the greater the amount of the first modifier used, the more conducive it is to improving the fluidity of polycarbonate. However, a higher amount of the first modifier will reduce the glass transition temperature and heat deformation temperature of polycarbonate, reducing the temperature resistance of polycarbonate. The addition of the second modifier can not only ensure that the first modifier improves the fluidity of polycarbonate, and can even further improve the fluidity of polycarbonate, but also improve the temperature resistance of polycarbonate, so that the fluidity and temperature resistance of the polycarbonate composition meet the processing requirements, especially meet the needs of the consumer electronic equipment field. For example: the polycarbonate composition of the embodiment of the present disclosure can be applied to various products in the electronic and electrical fields. For example: the polycarbonate composition of the embodiment of the present disclosure can be used for the production of terminal shells, and the terminal shell produced by the polycarbonate composition of the embodiment of the present disclosure reduces defects such as floating fibers, flow marks, and stress marks, thereby improving product quality.

[0067] Without limitation, polycarbonate includes aromatic polycarbonate and / or aromatic polyester carbonate prepared according to known methods in the literature. For example, aromatic polycarbonate can be prepared by reacting diphenol with diphenyl carbonate using a melt polymerization method. Wherein, the diphenol includes at least one of the following: diphenol includes hydroquinone, resorcinol, dihydroxy diphenol, bis-(hydroxyphenyl)-ether, bis-(hydroxyphenyl)-sulfoxide, bis-(hydroxyphenyl)-ketone, bis-(hydroxyphenyl)-sulfone and α,α-bis-(hydroxyphenyl)-diisopropyl-benzene and its ring brominated and / or ring chlorinated derivatives.

[0068] The present invention uses a first modifier to improve the fluidity of polycarbonate, so that the fluidity of the polycarbonate composition meets the processing requirements. The second modifier enhances the problem of reduced temperature resistance of polycarbonate caused by the use of the first modifier. The second modifier further improves the temperature resistance of polycarbonate on the basis of ensuring the fluidity of polycarbonate. Therefore, through the use of the first modifier and the second modifier, the fluidity and temperature resistance of polycarbonate are improved at the same time.

[0069] In other optional embodiments, the second modifier comprises: phenyl methacrylate-styrene-acrylonitrile copolymer and / or hyperbranched polyester.

[0070] Phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester both have flow-promoting effects. When one of them or both of them are used together with the first modifier, the fluidity of polycarbonate can be improved while also improving the temperature resistance of polycarbonate.

[0071] Compared with the second modifier containing only phenyl methacrylate-styrene-acrylonitrile copolymer or hyperbranched polyester, adding the first modifier, phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester simultaneously can further improve the fluidity and temperature resistance of the polycarbonate composition.

[0072] Without limitation, the hyperbranched polyester can be obtained by esterification of polyacid and polyol monomer.

[0073] Hyperbranched polyesters include, but are not limited to, polyesters with uncrosslinked terminal hydroxyl or carboxyl groups, for example, the hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester. A polyhydroxy carboxyl compound and a catalyst can be added to a polyol compound, and the polyhydroxy carboxyl compound and the polyol compound can be reacted under the protection of an inert gas to obtain a hydroxyl-terminated hyperbranched polyester.

[0074] In other optional embodiments, the first modifier includes: phosphate ester.

[0075] Phosphate esters can reduce the forces between polycarbonate molecules, reduce the viscosity of molten polycarbonate, and thus improve the fluidity of polycarbonate.

[0076] In some embodiments, by simultaneously adding triphenyl phosphate, phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester to polycarbonate, a higher melt index, HDT (Heat deflection temperature) and Tg (transition temperature) can be obtained, indicating that the polycarbonate composition has both fluidity and temperature resistance.

[0077] In the disclosed embodiment, the phosphate ester may be at least one of an aromatic phosphate ester and / or an aliphatic-aromatic phosphate ester. For example, the aromatic phosphate ester includes, but is not limited to, tricresyl phosphate, tricresyl phosphate, bisphenol A-polyphenyl phosphate, or dipyrocatechol diphosphate, etc. The aliphatic-aromatic phosphate ester includes, but is not limited to, diphenyl (2-ethylhexyl) phosphate, diphenyl-2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, or phenyl neopentyl phosphate, etc.

[0078] In some embodiments, the phosphate ester comprises: triphenyl phosphate, and / or, resorcinol bis(diphenyl phosphate).

[0079] In other optional embodiments, the polycarbonate composition further comprises:

[0080] Impact modifier; wherein the impact modifier comprises at least one of the following:

[0081] Ethylene-methyl acrylate copolymer, methyl methacrylate-butadiene-styrene terpolymer, silicone-acrylate rubber or polyolefin elastomer.

[0082] Impact modifiers can improve the impact resistance of polycarbonate and enhance the mechanical strength of polycarbonate.

[0083] Polyolefin elastomers are copolymers of ethylene and propylene or α-olefins, wherein the α-olefins may be 1-butene, 1-hexene, 1-octene or 1-octene.

[0084] In other optional embodiments, the polycarbonate composition further comprises:

[0085] Additives; wherein the additives include at least one of the following:

[0086] Antioxidants, release agents, lubricants, colorants, fillers, UV stabilizers, flame retardants or antistatic agents.

[0087] In practical applications, different types of additives can be added as needed. For example, if you need to improve the antioxidant properties of polycarbonate, you can add an antioxidant. If you need to improve the flame retardancy of polycarbonate, you can add a flame retardant. If you need to increase the mechanical strength of polycarbonate, you can add fillers such as glass fiber or silica.

[0088] Without limitation, the antioxidant comprises at least one of the following: alkylated monophenols, alkylthiomethylphenols, hydroquinone compounds and alkylated hydroquinones, tocopherol compounds, hydroxylated thiodiphenyl ethers, alkylene bisphenols, O-benzyl compounds, N-benzyl compounds and S-benzyl compounds.

[0089] The release agent comprises at least one of the following: pentaerythritol tetrastearate, erythritol, and glycerin.

[0090] The lubricant may be a long-chain fatty acid and its salt, or a polyethylene wax, etc. The long-chain fatty acid includes but is not limited to stearic acid or montan wax, and the salt of the long-chain fatty acid includes but is not limited to calcium stearate or zinc stearate.

[0091] The colorant may be an inorganic pigment, an organic pigment or a dye, wherein the inorganic pigment includes but is not limited to: iron dioxide, ultramarine blue, iron oxide and carbon black. The organic pigment includes but is not limited to phthalocyanine, quinacridone pigment and perylene pigment. The dye includes but is not limited to aniline black or anthraquinone.

[0092] The ultraviolet stabilizer comprises at least one of the following: benzophenone, benzotriazole and salicylate.

[0093] The flame retardant may be a flame retardant of a type and amount commonly used in the industry. For example, the flame retardant includes at least one of the following: BDP (bisphenol A bis(diphenyl phosphate)), triphenyl phosphate (TPP), polyphosphazene or resorcinol bis(diphenyl phosphate) (RDP).

[0094] Antistatic agents: conductive carbon black, carbon fibers, carbon nanotubes, and organic antistatic agents such as polyalkylene ethers, alkyl sulfonates, or polyamide-containing polymers.

[0095] It is to be understood that the additives are not limited to the types listed in the embodiments of the present disclosure, and other additives may be added as needed, and other additives and their amounts may be used as those known to those skilled in the art and appropriately adjusted when necessary.

[0096] In other optional embodiments, the polycarbonate composition comprises:

[0097] 60-95wt% polycarbonate;

[0098] 0.5-4wt% of the phosphate ester;

[0099] 0.5-10wt% of the phenyl methacrylate-styrene-acrylonitrile copolymer;

[0100] 0.1 to 5 wt% of the hyperbranched polyester;

[0101] 1 to 15% wt% of the impact modifier, and

[0102] 0.1 to 10 wt% of the additive.

[0103] In the embodiments of the present disclosure, unless otherwise specified, the content of each component refers to the weight ratio, that is, expressed in wt%.

[0104] In some embodiments, the content of polycarbonate in the polycarbonate composition can be any value among 60wt%, 70wt%, 75wt%, 80wt%, 85wt%, 86wt%, 88wt%, 90wt%, 92wt% or 95wt%, or between any two values. For example, the polycarbonate composition contains 80-95wt% of the polycarbonate.

[0105] In some embodiments, the content of the phosphate ester in the polycarbonate composition can be any value among 0.5wt%, 1.0wt%, 1.2wt%, 1.5wt%, 2.0wt%, 2.5wt%, 3.0wt%, 3.5wt% or 4.0wt%, or between any two values. For example, the polycarbonate composition comprises 1 to 3wt% of the phosphate ester.

[0106] In some embodiments, the content of the phenyl methacrylate-styrene-acrylonitrile copolymer in the polycarbonate composition can be any value among 0.5wt%, 1.0wt%, 1.5wt%, 2.0wt%, 3.0wt%, 4.0wt%, 5.0wt%, 6.0wt%, 7.5wt%, 8.0wt%, 9.0wt% or 10.0wt%, or between any two values. For example, the polycarbonate composition comprises 0.5-5%wt% of the phenyl methacrylate-styrene-acrylonitrile copolymer.

[0107] In some embodiments, the content of the hyperbranched polyester in the polycarbonate composition can be any value among 0.1 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%, 2.5 wt%, 3.0 wt%, 4.0 wt% or 5.0 wt%, or between any two values.

[0108] In some embodiments, the content of the impact modifier in the polycarbonate composition can be any value among 1.0 wt%, 3.0 wt%, 5.0 wt%, 6.0 wt%, 8.0 wt%, 10.0 wt% or 15.0 wt%, or between any two values. For example, the polycarbonate composition contains 3 to 6 wt%.

[0109] In some embodiments, the content of the impact modifier in the polycarbonate composition can be any value among 0.1wt%, 0.5wt%, 1.0wt%, 2.0wt%, 5.0wt%, 7.0wt% or 10.0wt%, or between any two values. For example, the polycarbonate composition contains 0.1-0.3wt%.

[0110] The disclosed embodiments further provide a shell made of the polycarbonate composition described in any of the above embodiments.

[0111] Without limitation, the housing may be a component such as a casing of a communication device or a household appliance.

[0112] An embodiment of the present disclosure further provides a mobile terminal, comprising the housing described in any of the above embodiments.

[0113] Mobile terminals include but are not limited to: mobile phones, tablet computers, laptops, televisions or wearable devices, etc.

[0114] Figure 1 The schematic diagram of the appearance structure of a mobile phone housing is exemplarily shown.

[0115] like Figure 2 As shown, the embodiment of the present disclosure also provides a method for preparing a shell, comprising:

[0116] Step S101, mixing polycarbonate, a first modifier and a second modifier to obtain a polycarbonate composition; wherein the first modifier is used to improve the fluidity of the polycarbonate; and the second modifier is at least used to improve the temperature resistance of the polycarbonate;

[0117] Step S102: forming the polycarbonate composition into the shell.

[0118] In step S101, the order of mixing the polycarbonate, the first modifier and the second modifier is not limited. For example, the first modifier and the second modifier may be premixed first, and then the remaining components such as the polycarbonate may be mixed; or the first modifier, the second modifier and the remaining components such as the polycarbonate may be mixed simultaneously.

[0119] In some embodiments, the polycarbonate, the first modifier and the second modifier are all in granular or powdered form, and the polycarbonate, the first modifier and the second modifier are mixed evenly. For example, the polycarbonate, the first modifier and the second modifier can be added to a stirring container at the same time and stirred evenly. At this time, the obtained polycarbonate composition can be solid.

[0120] In some embodiments, the polycarbonate may be melted first, and then other components such as the first modifier and the second modifier may be added. At this time, the obtained polycarbonate composition may be in a molten state.

[0121] In step S102 , if the obtained polycarbonate composition is in a solid state, the polycarbonate composition needs to be melted again and then solidified to form a shell.

[0122] In some embodiments, the mixing of polycarbonate, the first modifier and the second modifier to obtain a polycarbonate composition includes: melting the polycarbonate composition; solidifying the polycarbonate composition to form a granular polycarbonate composition; the forming of the shell from the polycarbonate composition includes: melting the granular polycarbonate composition; solidifying the molten granular polycarbonate composition to obtain the shell. The polycarbonate composition is first formed into granules and then the shell is made, so that the process of mixing to form the polycarbonate composition and the process of preparing the shell can be separated, which is convenient for industrial production.

[0123] In some embodiments, forming the polycarbonate composition into the housing comprises:

[0124] melting the polycarbonate composition;

[0125] The polycarbonate composition in a molten state is solidified to obtain the shell.

[0126] In practical applications, heating is performed to make all components of the polycarbonate composition, such as polycarbonate, the first modifier and the second modifier, in a fluid state so that the polycarbonate composition can be added into a mold. The polycarbonate composition in a molten state in the mold is cooled, and the polycarbonate composition will solidify to form a shell of a desired shape.

[0127] In some embodiments, the polycarbonate, the first modifier and the second modifier are mixed to obtain a polycarbonate composition, comprising:

[0128] melting the polycarbonate;

[0129] adding the first modifier and the second modifier into the polycarbonate in a molten state;

[0130] The step of forming the polycarbonate composition into the housing comprises:

[0131] The polycarbonate composition is cured to obtain the shell.

[0132] In some embodiments, the polycarbonate, the first modifier and the second modifier are mixed to obtain a polycarbonate composition, comprising:

[0133] melting the polycarbonate;

[0134] The first modifier and the second modifier are added to the polycarbonate in a molten state.

[0135] In some embodiments, the second modifier comprises: phenyl methacrylate-styrene-acrylonitrile copolymer and / or hyperbranched polyester.

[0136] In some embodiments, the first modifier comprises: phosphate ester.

[0137] In some embodiments, the method further comprises:

[0138] An impact modifier is mixed with the polycarbonate, the first modifier and the second modifier; wherein the impact modifier comprises at least one of the following:

[0139] Ethylene-methyl acrylate copolymer, methyl methacrylate-butadiene-styrene terpolymer, silicone-acrylate rubber or polyolefin elastomer.

[0140] In some embodiments, the method further comprises:

[0141] Adding additives; wherein the additives include at least one of the following:

[0142] Antioxidants, release agents, lubricants, colorants, fillers, UV stabilizers, flame retardants or antistatic agents.

[0143] In some embodiments, the polycarbonate composition comprises:

[0144] 60-95wt% polycarbonate;

[0145] 0.5-4wt% of the phosphate ester;

[0146] 0.5-10wt% of the phenyl methacrylate-styrene-acrylonitrile copolymer;

[0147] 0.1 to 5 wt% of the hyperbranched polyester;

[0148] 1 to 15% wt% of the impact modifier, and

[0149] 0.1 to 10 wt% of the additive.

[0150] In some embodiments, the phosphate ester comprises: triphenyl phosphate, and / or, resorcinol bis(diphenyl phosphate).

[0151] In some embodiments, the process of preparing a granular polycarbonate composition is roughly as follows: premixing an impact modifier with an additive (such as a release agent) to obtain a premixed mixture; mixing the premixed mixture with other components in the polycarbonate composition; and granulating by, for example, a twin-screw extruder to obtain pellets.

[0152] The technical solution of the present disclosure is further described below in conjunction with specific embodiments. It should be understood that the present disclosure is not limited to the following embodiments.

[0153] In Example 1 and Example 2, and Comparative Examples 1 to Comparative Examples 3, the formulations of the components are shown in Table 1, and the properties of the products of the Examples and Comparative Examples are shown in Table 2. Among them, the antioxidant is alkylthiomethylphenol, the impact modifier is ethylene-methyl acrylate copolymer, and the difference between Example 1 and Example 2, and Comparative Examples 1 to Comparative Examples 3 is that the components and amounts of the polycarbonate composition shown in Table 1 are different, and the preparation methods and various performance test methods are the same.

[0154] The melt index is tested according to ASTM D1238 standard, and the test conditions are 260℃ / 2.16kg.

[0155] The breaking strength and breaking elongation are tested according to ASTM D638 standard.

[0156] The flexural strength is tested according to ASTM D790.

[0157] Notched impact strength is tested according to ASTM D256.

[0158] HDT is tested according to ASTM D648 standard.

[0159] Tg is measured by DSC (Differential Scanning Calorimeter).

[0160] The melt index test can be performed on a granular polycarbonate composition. The samples of breaking strength, breaking elongation, notched impact strength, HDT and Tg are all formed by injection molding.

[0161] The unit of the specific property is shown in brackets. For example, the unit of bending strength is MPa.

[0162] Table 1, Composition of polycarbonate composition samples of Examples and Comparative Examples

[0163]

[0164] Table 2, properties of polycarbonate composition samples of Examples and Comparative Examples

[0165]

[0166] As shown in Table 1 and Table 2, it can be seen from the performance data of Comparative Examples 2 and 3 that the polycarbonate composition of Comparative Example 2, which has a larger amount of phosphate ester, has a larger melt index, but both HDT and Tg are reduced. Therefore, increasing the amount of phosphate ester can increase the fluidity of the polycarbonate composition, but will reduce the temperature resistance of the polycarbonate composition.

[0167] Comparing Comparative Example 1 with Comparative Example 2 and / or Comparative Example 3, it can be seen that after adding the phenyl methacrylate-styrene-acrylonitrile copolymer, even if the amount of phosphate ester is reduced, the fluidity of the polycarbonate composition is still high, and the HDT and Tg values ​​are improved, that is, the addition of the phenyl methacrylate-styrene-acrylonitrile copolymer can improve the fluidity of the polycarbonate composition, and also improve the temperature resistance of the polycarbonate composition.

[0168] The data comparison of Example 1 and Example 2 with Comparative Examples 1 to 3 shows that the simultaneous addition of triphenyl phosphate, phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester to polycarbonate can further improve the melt index, HDT and Tg of the polycarbonate composition. It shows that the polycarbonate modified by the first modification and the second modification agent has both fluidity and temperature resistance. By comparing the embodiments of the present disclosure with the comparative examples, the phosphate improves the fluidity of the polycarbonate while reducing Tg and HDT. The compounding of phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester effectively improves the fluidity and temperature resistance. This polycarbonate composition can meet the processing and temperature resistance requirements of mobile phones and other terminals after the shell is thinned.

[0169] The methods disclosed in several method embodiments provided in the present disclosure can be arbitrarily combined without conflict to obtain new method embodiments.

[0170] The features disclosed in several product embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new product embodiments.

[0171] The features disclosed in several method or product embodiments provided in the present disclosure may be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0172] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0173] It should be understood that the present disclosure is not limited to the specific components that have been described above and shown in the tables, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A polycarbonate composition, characterized in that The polycarbonate composition comprises: 60-95 wt % of polycarbonate, a first modifier and a second modifier; Wherein, the first modifier includes: 0.5-4 wt% of phosphate ester, which is used to improve the fluidity of the polycarbonate; The second modifier comprises: phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester, and is at least used to improve the temperature resistance of the polycarbonate.

2. The polycarbonate composition according to claim 1, characterized in that The polycarbonate composition further comprises: Impact modifier; wherein the impact modifier comprises at least one of the following: Ethylene-methyl acrylate copolymer, methyl methacrylate-butadiene-styrene terpolymer, silicone-acrylate rubber or polyolefin elastomer.

3. The polycarbonate composition according to claim 2, characterized in that The polycarbonate composition further comprises: Additives; wherein the additives include at least one of the following: Antioxidants, release agents, lubricants, colorants, fillers, UV stabilizers, flame retardants or antistatic agents.

4. The polycarbonate composition according to claim 3, characterized in that The polycarbonate composition comprises: 0.5-10 wt % of the phenyl methacrylate-styrene-acrylonitrile copolymer; 0.1 to 5 wt % of the hyperbranched polyester; 1 to 15% wt % of the impact modifier, and 0.1~10wt% of the additive.

5. The polycarbonate composition according to claim 4, characterized in that The polycarbonate composition comprises: 0.5-5% wt % of the phenyl methacrylate-styrene-acrylonitrile copolymer; and / or; 1~3% wt% hyperbranched polyester.

6. The polycarbonate composition according to claim 1, characterized in that The phosphate ester comprises: triphenyl phosphate, and / or resorcinol bis(diphenyl phosphate).

7. A housing, characterized in that: Made from the polycarbonate composition according to any one of claims 1 to 6.

8. A mobile terminal, characterized in that: Comprising the housing as claimed in claim 7.

9. A method for preparing a shell, characterized in that: include: Mixing 60-95 wt% of polycarbonate, a first modifier and a second modifier to obtain a polycarbonate composition; wherein the first modifier comprises: 0.5-4 wt% of phosphate ester for improving the fluidity of the polycarbonate; the second modifier comprises: phenyl methacrylate-styrene-acrylonitrile copolymer and hyperbranched polyester, at least for improving the temperature resistance of the polycarbonate; The polycarbonate composition is formed into the housing.

10. The method for preparing a housing according to claim 9, characterized in that: The step of forming the polycarbonate composition into the housing comprises: melting the polycarbonate composition; The polycarbonate composition in a molten state is solidified to obtain the shell.

11. The method for preparing a housing according to claim 9, characterized in that: The method further comprises: An impact modifier is mixed with the polycarbonate, the first modifier and the second modifier; wherein the impact modifier comprises at least one of the following: Ethylene-methyl acrylate copolymer, methyl methacrylate-butadiene-styrene terpolymer, silicone-acrylate rubber or polyolefin elastomer.

12. The method for preparing a housing according to claim 11, characterized in that: The method further comprises: Adding additives; wherein the additives include at least one of the following: Antioxidants, release agents, lubricants, colorants, fillers, UV stabilizers, flame retardants or antistatic agents.

13. The method for preparing a housing according to claim 12, characterized in that: The polycarbonate composition comprises: 0.5-10 wt % of the phenyl methacrylate-styrene-acrylonitrile copolymer; 0.1 to 5 wt % of the hyperbranched polyester; 1 to 15% wt % of the impact modifier, and 0.1~10wt% of the additive.

14. The method for preparing a housing according to claim 9, characterized in that: The phosphate ester comprises: triphenyl phosphate, and / or resorcinol bis(diphenyl phosphate).

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