High-hardness pc / pmma alloy material, preparation method and application thereof

Abstract

The application relates to a high-hardness PC / PMMA alloy material and a preparation method and application thereof, and mainly solves the problems of poor surface hardness, poor fluidity and poor toughness of the PC / PMMA alloy material in the prior art. The functional resin component is added in the high-hardness PC / PMMA alloy material, excellent rigidity, surface hardness and scratch resistance of the alloy material can be given, the flow performance and processing performance of the alloy material are improved, the above problems are better solved, and the alloy material can be used for high-frequency communication mobile phone electronic material components.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer composite materials, and particularly relates to a high-hardness PC / PMMA alloy material and a preparation method and application thereof. BACKGROUND

[0002] Polycarbonate (PC) has excellent impact resistance, thermal performance and processing performance, and has high light transmittance comparable to glass, and is widely used in electronic appliances, household appliances, displays, communication equipment, optical lenses, mobile phone housings, goggles and automobile lampshades and other parts. At present, the PC is used as the preferred base material, and the injection molding plastic glass-imitating mobile phone back cover scheme has become a research and development application hotspot of mobile phone back cover manufacturers. The glass-imitating back cover requires a plastic surface hardness of at least 2H or more. However, the PC surface hardness is poor, is easily abraded, and is prone to yellowing and poor flowability, and the hardness is only 2B to 3B, which is far lower than the application requirement of the glass-imitating back cover. The polymethyl methacrylate (PMMA) is a high-transparency thermoplastic resin, and the hardness is 2H without treatment and can reach 5H after surface hardening, and has excellent weather resistance and aging resistance. Therefore, the PC surface is usually coated and modified, or PMMA, scratch-resistant agents and other modified additives are added to modify the scratch resistance and improve the surface hardness.

[0003] Chinese patent CN102807746A reports a PC / PMMA / AS alloy with mechanical properties, high hardness and high flow, pencil hardness 2H to 3H, and the raw material composition contains an ethylene-methyl acrylate copolymer toughening agent and a glycidyl methacrylate grafted ethylene-methyl acrylate copolymer compatibilizer, but the ethylene component contained therein has a certain degree of compatibility problem with PC, PMMA, AS and other material compositions. CN108976747A discloses a transparent high-hardness PC composition including PC, polyester and styrene copolymer components, and the hardness is HB to 3B. The PC involved contains aliphatic long-chain, polydimethylsiloxane, methyl methacrylate, cyclohexane bisphenol A and other third monomers, which undoubtedly increases the production and manufacturing cost. In addition, inorganic fillers such as calcium carbonate, glass fiber, hollow glass microspheres, boron fiber and the like are also used in CN105524444A, CN112322019A, CN109553948A and other patents to improve the surface hardness of PC and its alloy, but the poor dispersibility of the inorganic fillers will affect the performance of the material. Therefore, the development and application of the PC / PMMA alloy material with high hardness and excellent flowability are of great significance. SUMMARY

[0004] To address the problems of poor surface hardness, poor fluidity, and poor toughness in existing PC / PMMA alloy materials, this invention provides a high-hardness PC / PMMA alloy material that can be used in electronic components for high-frequency communication mobile phones.

[0005] One of the objectives of this invention is to provide a high-hardness PC / PMMA alloy material, comprising the following components based on a total weight of 100 parts of PC resin and PMMA resin: 10-90 parts of PC resin, 10-90 parts of PMMA resin, and 1-30 parts of functional resin, wherein the polymer monomers in the functional resin include styrene, acrylate compounds and / or maleimide compounds, and optionally acrylonitrile compounds.

[0006] Preferably, based on a total weight of 100 parts of PC resin and PMMA resin, the PC resin comprises 15-85 parts, the PMMA resin comprises 15-85 parts, and the functional resin comprises 1-25 parts; preferably, based on a total weight of 100 parts of PC resin and PMMA resin, the PC resin comprises 20-80 parts, the PMMA resin comprises 20-80 parts, and the functional resin comprises 2-20 parts.

[0007] Preferably,

[0008] The PC resin is selected from PC resins with a melt flow rate of 1-40 g / 10 min at 300°C and 1.2 kg, preferably PC resins with a melt flow rate of 5-35 g / 10 min at 300°C and 1.2 kg; the PC resin is selected from at least one of aromatic polycarbonate, aliphatic polycarbonate, alicyclic polycarbonate, aromatic-aliphatic polycarbonate, aromatic-alicyclic polycarbonate, aliphatic-alicyclic polycarbonate, polyester-polycarbonate, and polysiloxane-polycarbonate, preferably at least one of bisphenol A type polycarbonate and aromatic / aliphatic copolymer polycarbonate;

[0009] The PMMA resin is selected from PMMA resin with a melt flow rate of 1 to 30 g / 10 min at 200°C and 5 kg, and preferably from PMMA resin with a melt flow rate of 2 to 20 g / 10 min at 200°C and 5 kg.

[0010] The acrylate compound in the functional resin is at least one selected from methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, butyl methacrylate, butyl acrylate, hexyl methacrylate, hexyl acrylate, hydroxyethyl methacrylate, and hydroxyethyl acrylate; specifically, the functional resin is selected from styrene-methyl methacrylate copolymer, styrene-methyl acrylate copolymer, styrene-N-phenylmaleimide copolymer, styrene-acrylonitrile-methyl methacrylate copolymer, styrene-acrylonitrile-N-phenylmaleimide copolymer, and styrene-methyl methacrylate. At least one of the following: styrene-methyl acrylate-N-phenylmaleimide copolymer, styrene-methyl acrylate-methyl methacrylate copolymer, styrene-acrylonitrile-methyl acrylate-methyl methacrylate copolymer, and styrene-methyl acrylate-methyl methacrylate-N-phenylmaleimide copolymer, preferably selected from at least one of the following: styrene-methyl methacrylate copolymer, styrene-acrylonitrile-methyl methacrylate copolymer, and styrene-acrylonitrile-N-phenylmaleimide copolymer.

[0011] The aforementioned alloy materials also contain at least one of the following: compatibilizer, toughening agent, lubricant, and antioxidant;

[0012] The compatibilizer can be selected from compatibilizers commonly used in the plastics processing field, and is preferably selected from at least one of the following: styrene-acrylonitrile-maleic anhydride copolymer, styrene-glycidyl methacrylate copolymer, styrene-acrylonitrile-glycidyl methacrylate copolymer, maleic anhydride-grafted styrene-acrylonitrile copolymer, maleic anhydride-grafted styrene-acrylonitrile-butadiene copolymer, maleic anhydride-grafted styrene-methyl methacrylate copolymer, maleic anhydride-grafted styrene-acrylonitrile-methyl methacrylate copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile-methyl methacrylate copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile copolymer, and glycidyl methacrylate-grafted styrene-acrylonitrile-methyl methacrylate copolymer.

[0013] The toughening agent can be selected from toughening agents commonly used in the plastics processing field, and is preferably selected from at least one of styrene-butadiene copolymer, styrene-acrylonitrile-butadiene-methyl methacrylate copolymer, butadiene-methyl methacrylate copolymer, butadiene-methyl acrylate copolymer, and styrene-butadiene-methyl acrylate copolymer.

[0014] The lubricant can be selected from lubricants commonly used in the plastics processing field, and is preferably selected from at least one of silicone oil, liquid paraffin, and white oil;

[0015] The antioxidant can be selected from antioxidants commonly used in the plastics processing field, preferably selected from at least one of the following: tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol;

[0016] Based on a total weight of 100 parts of PC resin and PMMA resin, the compatibilizer comprises 0.1 to 15 parts, the toughening agent comprises 0.1 to 15 parts, the lubricant comprises 0.1 to 5 parts, and the antioxidant comprises 0.1 to 5 parts; preferably, based on a total weight of 100 parts of PC resin and PMMA resin, the compatibilizer comprises 0.1 to 10 parts, the toughening agent comprises 0.1 to 10 parts, the lubricant comprises 0.5 to 1.5 parts, and the antioxidant comprises 0.1 to 1 part.

[0017] The second objective of this invention is to provide a method for preparing the aforementioned high-hardness PC / PMMA alloy material, comprising mixing components including the aforementioned PC resin, PMMA resin, and functional resin, and then melt-blending to obtain the high-hardness PC / PMMA alloy material. The mixing may also include at least one of a compatibilizer, toughening agent, lubricant, and antioxidant. The melt-blending temperature is 220–300°C, preferably 240–280°C. The melt-blending can be performed using equipment and process conditions commonly used in the art, such as a twin-screw extruder with a screw speed set to 50–350 rpm.

[0018] One specific embodiment of the above preparation method can be implemented by the following scheme: the required amount of PC resin, PMMA resin, functional resin, compatibilizer, toughening agent, lubricant, antioxidant and other components are fully mixed at room temperature, and then fed into the main feed port of a twin-screw extruder, and granulated by melt kneading to obtain the high hardness PC / PMMA alloy material.

[0019] A third objective of this invention is to provide the above-mentioned high-hardness PC / PMMA alloy material or the high-hardness PC / PMMA alloy material obtained by the above-mentioned preparation method for use in electronic material components of communication equipment.

[0020] The high-hardness PC / PMMA alloy material provided by this invention introduces functional resins that not only form interfacial compatibility with PC and PMMA resins, improving the compatibility of PC and PMMA, but also endow the alloy material with excellent rigidity, surface hardness, and scratch resistance, improving its flow properties and processing performance, which is beneficial for manufacturing materials such as thin-walled mobile phone back panels. Furthermore, compatibilizers and toughening agents further endow the PC / PMMA alloy material with excellent multiphase composite compatibility and impact toughness, thereby improving the material's overall mechanical properties.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The functional resin component added in this invention has excellent compatibility with the matrix material, which not only improves the processing performance of the alloy material, but also significantly enhances its mechanical properties;

[0023] 2. This invention prepares a PC / PMMA alloy with a surface hardness of 3H through polymer composite modification technology without adding minerals or reinforcing fibers, achieving good technical results.

[0024] 3. The alloy material prepared by this invention has excellent processing flow properties and is suitable for preparing thin-walled or ultra-thin structural parts;

[0025] 4. The preparation method provided by this invention uses readily available raw materials, is simple to operate, and is easy to implement in industrial production, thus having broad application prospects. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0027] The testing instruments and conditions used in this embodiment are as follows:

[0028] Melt flow rate (MFR) test: determined according to ISO 1133 standard, temperature 300℃, load 1.2kg.

[0029] Notched impact strength test of simply supported beam: measured according to ISO 179 standard, pendulum energy 5J.

[0030] Flexural modulus test: determined according to ISO 178 standard, at a speed of 2 mm / min.

[0031] Pencil hardness test: measured according to GB / T 6739-1996 standard, load 1000g.

[0032] Scratch resistance test: According to GME 60248 standard, the surface was rubbed 2500 times with steel wool at a force of 1 kg.

[0033] The basic performance parameters and sources of the raw materials used in the examples are as follows:

[0034] PC-1: Melt flow rate (300℃, 1.2kg) 10g / 10min, bisphenol A type, Sinopec Mitsubishi Chemical Polycarbonate (Beijing) Co., Ltd.;

[0035] PC-2: Melt flow rate (300℃, 1.2kg) 5g / 10min, bisphenol A type, Mitsubishi Chemical Co., Ltd., Japan;

[0036] PC-3: Melt flow rate (300℃, 1.2kg) 35g / 10min, bisphenol A and cyclohexyl glycol copolymer, SABIC Innovative Materials Co., Ltd.

[0037] PC-4: Melt flow rate (300℃, 1.2kg) 18g / 10min, Bisphenol A type, SABIC Innovative Materials Co., Ltd.

[0038] PMMA-1: Melt flow rate (200℃, 2.16kg) 8g / 10min, LG Chem Ltd., South Korea;

[0039] PMMA-2: Melt flow rate (200℃, 2.16kg) 20g / 10min, LG Chem Ltd., South Korea;

[0040] PMMA-3: Melt flow rate (200℃, 2.16kg) 3g / 10min, Asahi Kasei Corporation, Japan;

[0041] Styrene-methyl methacrylate copolymer (SMMA): Jinjinle Chemical Co., Ltd.

[0042] Styrene-acrylonitrile-methyl methacrylate copolymer (ASMMA): Shenzhen Aituo Chemical Co., Ltd.;

[0043] Styrene-methyl acrylate-methyl methacrylate copolymer (SMAMMA): Nufak Corporation, USA, melt flow rate (220℃, 2.16kg) 30g / 10min;

[0044] Styrene-acrylonitrile-N-phenylmaleimide copolymer ASMI: See Example 5 in patent CN 101081886A;

[0045] Styrene-acrylonitrile-acrylate copolymer ASA: core-shell structure, Benzyl Corporation, South Korea;

[0046] Styrene-acrylonitrile-butadiene-methyl methacrylate copolymer (MABS): polybutadiene core, methyl methacrylate-styrene-acrylonitrile copolymer shell, LG Chem;

[0047] Maleic anhydride-grafted styrene-acrylonitrile copolymer MAH-g-AS: maleic anhydride grafting content 2%, acrylonitrile content 24%, Shanghai Ziyi Reagent Co., Ltd.

[0048] Maleic anhydride-grafted styrene-acrylonitrile-butadiene copolymer MAH-g-ABS: Shenzhen Pasteur New Materials Co., Ltd.;

[0049] Styrene-butadiene block copolymer (SBC): See Example 1 in patent 107236101A;

[0050] Styrene-acrylonitrile copolymer AS: Acrylonitrile content 25%, molecular weight 240,000, LG Chem Ltd., South Korea;

[0051] Lubricant: Liquid paraffin, Sinopharm Group Co., Ltd.;

[0052] Antioxidant: Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], THIAI Ltd.

[0053] Examples 1-8

[0054] Preparation of high-hardness PC / PMMA alloy material: Dry-treated PC resin, dry-treated PMMA resin, functional resin, compatibilizer, lubricant, antioxidant, etc., are thoroughly mixed at room temperature. Then, the mixture is fed into the main feed inlet of a LABTECH co-rotating twin-screw extruder (screw diameter 16mm, L / D ratio 40), and subjected to melt kneading extrusion at 270℃, 200rpm, and a feed rate of 7.5kg / h. After cooling and granulation, high-hardness PC / PMMA alloy material is obtained. Its formulation composition and comprehensive properties are shown in Tables 1 and 2.

[0055] Comparative Example 1

[0056] Preparation of PC / PMMA alloy material: Dry-treated PC resin, dry-treated PMMA resin, compatibilizer, toughening agent, lubricant, antioxidant, etc., are thoroughly mixed at room temperature. Then, the mixture is fed into the main feed inlet of a LABTECH co-rotating twin-screw extruder (screw diameter 16mm, L / D ratio 40), and extruded under process conditions of 270℃, 200rpm, and a feed rate of 7.5kg / h. After melting and kneading, the mixture is cooled and granulated to obtain the PC / PMMA alloy material. Its formulation composition and comprehensive properties are shown in Tables 1 and 2.

[0057] Comparative Example 2

[0058] Preparation of PC / PMMA alloy material: Dry-treated PC resin, dry-treated PMMA resin, ASA copolymer, compatibilizer, toughening agent, lubricant, antioxidant, etc., are thoroughly mixed at room temperature. Then, the mixture is fed into the main feed inlet of a LABTECH co-rotating twin-screw extruder (screw diameter 16mm, L / D ratio 40), and subjected to melt kneading extrusion at 270℃, 200rpm, and a feed rate of 7.5kg / h. After cooling and granulation, the PC / PMMA alloy material is obtained. Its formulation composition and comprehensive properties are shown in Tables 1 and 2.

[0059] Table 1. Composition of Examples 1-8 and Comparative Examples 1-2

[0060]

[0061] Table 2. Comprehensive properties of alloy materials obtained in Examples 1-8 and Comparative Examples 1-2

[0062]

[0063]

[0064] Comparing Examples 1-8 with Comparative Examples 1-2 in Tables 1 and 2, it can be seen that by adding functional resins, PC / PMMA alloy materials with excellent flow properties, high mechanical strength, hardness of 3H or higher, scratch resistance, and wear resistance can be obtained, and their overall performance is better.

[0065]

Examples 9-15

[0066] Preparation of high-hardness PC / PMMA alloy material: Dry-treated PC resin, dry-treated PMMA resin, functional resin, compatibilizer, toughening agent, lubricant, antioxidant, etc., are thoroughly mixed at room temperature. Then, the mixture is fed into the main feed inlet of a LABTECH co-rotating twin-screw extruder (screw diameter 16mm, L / D ratio 40), and subjected to melt kneading extrusion at 270℃, 200rpm, and a feed rate of 7.5kg / h. After cooling and granulation, the high-hardness PC / PMMA alloy material is obtained. Its formulation composition and comprehensive properties are shown in Tables 3 and 4.

[0067] Comparative Example 3

[0068] Preparation of PC / PMMA alloy material: Dry-treated PC resin, dry-treated PMMA resin, styrene-acrylonitrile copolymer (AS), compatibilizer, toughening agent, lubricant, antioxidant, etc., are thoroughly mixed at room temperature. Then, the mixture is fed into the main feed inlet of a LABTECH co-rotating twin-screw extruder (screw diameter 16mm, L / D ratio 40), and extruded under process conditions of 270℃, 200rpm, and a feed rate of 7.5kg / h. After melting and kneading, the mixture is cooled and granulated to obtain a high-hardness PC / PMMA alloy material. Its formulation composition and comprehensive properties are shown in Tables 3 and 4.

[0069] Table 3. Composition of Examples 9-20 and Comparative Example 3

[0070]

[0071]

[0072] Table 4. Physical properties of the alloy materials obtained in Examples 9-20 and Comparative Example 3

[0073]

[0074] Comparing Examples 9-15 in Tables 3 and 4 with Comparative Example 3, it can be seen that by adjusting the type of PC and its ratio with PMMA, and the type and ratio of functional resins, PC / PMMA alloy materials with excellent flow properties, high impact resistance, hardness of 3H or higher, scratch resistance, and wear resistance can be obtained. These materials are superior to those using AS in conventional methods and have better overall performance.

[0075] Furthermore, it can be seen from Examples 9-11 and Examples 16-20 that by adjusting the ratio of SMAMMA and ASMI, an alloy material with excellent flow properties, high impact strength, and high hardness can be prepared. Moreover, the weight ratio of SMAMMA to ASMI is preferably (1:4) to (4:1), indicating that when the two are used together, they have better overall performance.

Claims

1. A high-hardness PC / PMMA alloy material, comprising, based on a total weight of 100 parts PC resin and PMMA resin, the following components: 10-90 parts PC resin, 10-90 parts PMMA resin, and 1-30 parts functional resin, wherein, The functional resin is a combination of styrene-methyl acrylate-methyl methacrylate copolymer and styrene-acrylonitrile-N-phenylmaleimide copolymer, wherein the weight ratio of the styrene-methyl acrylate-methyl methacrylate copolymer to the styrene-acrylonitrile-N-phenylmaleimide copolymer is (1:4) to (4:1); the alloy material further comprises a toughening agent, wherein the toughening agent is selected from at least one of styrene-butadiene copolymer, styrene-acrylonitrile-butadiene-methyl methacrylate copolymer, butadiene-methyl methacrylate copolymer, butadiene-methyl acrylate copolymer, and styrene-butadiene-methyl acrylate copolymer.

2. The alloy material according to claim 1, characterized in that, Based on a total weight of 100 parts for the PC resin and PMMA resin, the PC resin comprises 15-85 parts, the PMMA resin comprises 15-85 parts, and the functional resin comprises 1-25 parts.

3. The alloy material according to claim 2, characterized in that, Based on a total weight of 100 parts for the PC resin and PMMA resin, the PC resin comprises 20-80 parts, the PMMA resin comprises 20-80 parts, and the functional resin comprises 2-20 parts.

4. The alloy material according to claim 1, characterized in that, The PC resin is selected from PC resins with a melt flow rate of 1~40 g / 10 min at 300℃ and 1.2 kg; and / or, The PC resin is selected from at least one of aromatic polycarbonate, aliphatic polycarbonate, alicyclic polycarbonate, aromatic-aliphatic polycarbonate, aromatic-alicyclic polycarbonate, aliphatic-alicyclic polycarbonate, polyester-polycarbonate, and polysiloxane-polycarbonate; and / or, The PMMA resin is selected from PMMA resin with a melt flow rate of 1~30g / 10min under conditions of 200℃ and 5kg.

5. The alloy material according to claim 4, characterized in that, The PC resin is selected from PC resins with a melt flow rate of 5~35 g / 10 min at 300℃ and 1.2 kg; and / or, The PC resin is selected from at least one of bisphenol A type polycarbonate and aromatic / aliphatic copolymer polycarbonate; and / or, The PMMA resin is selected from PMMA resin with a melt flow rate of 2~20g / 10min under conditions of 200℃ and 5kg.

6. The alloy material according to claim 1, characterized in that, The alloy material also contains at least one of a compatibilizer, a lubricant, and an antioxidant.

7. The alloy material according to claim 6, characterized in that, The compatibilizer is selected from at least one of the following: styrene-acrylonitrile-maleic anhydride copolymer, styrene-glycidyl methacrylate, styrene-acrylonitrile-glycidyl methacrylate, maleic anhydride-grafted styrene-acrylonitrile copolymer, maleic anhydride-grafted styrene-acrylonitrile-butadiene copolymer, maleic anhydride-grafted styrene-methyl methacrylate copolymer, maleic anhydride-grafted styrene-acrylonitrile-methyl methacrylate copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile copolymer, glycidyl methacrylate-grafted styrene-methyl methacrylate copolymer, glycidyl methacrylate-grafted styrene-acrylonitrile-methyl methacrylate copolymer, glycidyl acrylate-grafted styrene-acrylonitrile copolymer, glycidyl acrylate-grafted styrene-acrylonitrile copolymer, glycidyl acrylate-grafted styrene-acrylonitrile copolymer, glycidyl acrylate-grafted styrene-acrylonitrile-methyl methacrylate copolymer; and / or, The lubricant is selected from at least one of silicone oil, liquid paraffin, and white oil; and / or, The antioxidant is selected from at least one of the following: tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol.

8. The alloy material according to claim 7, characterized in that, Based on a total weight of 100 parts of PC resin and PMMA resin, the compatibilizer is 0.1-15 parts, the toughening agent is 0.1-15 parts, the lubricant is 0.1-5 parts, and the antioxidant is 0.1-5 parts.

9. The alloy material according to claim 8, characterized in that, Based on a total weight of 100 parts of PC resin and PMMA resin, the compatibilizer is 0.1 to 10 parts, the toughening agent is 0.1 to 10 parts, the lubricant is 0.5 to 1.5 parts, and the antioxidant is 0.1 to 1 part.

10. A method for preparing a high-hardness PC / PMMA alloy material according to any one of claims 1 to 9, comprising mixing components including the PC resin, PMMA resin, functional resin, and toughening agent, and then melt-blending to obtain the high-hardness PC / PMMA alloy material.

11. The preparation method according to claim 10, characterized in that, The mixture also contains at least one of a compatibilizer, a lubricant, and an antioxidant.

12. The preparation method according to claim 10, characterized in that, The melt blending temperature is 220~300℃.

13. The preparation method according to claim 12, characterized in that, The melt blending temperature is 240~280℃.

14. A high-hardness PC / PMMA alloy material according to any one of claims 1 to 9 or a high-hardness PC / PMMA alloy material obtained by the preparation method according to any one of claims 10 to 13, for use in electronic material components of communication equipment.

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