A polymer alloy and a preparation method and application thereof

Abstract

The application provides a polymer alloy and a preparation method and application thereof, the polymer alloy comprises 60-80 parts of polycarbonate, 8-20 parts of acrylonitrile-butadiene-styrene copolymer, 5-12 parts of a phosphorus flame retardant, 1-6 parts of an anti-noise auxiliary agent and 0.8-5 parts of a filler in terms of weight parts; the phosphorus flame retardant comprises a phosphazene flame retardant; the filler comprises talcum powder; and the anti-noise auxiliary agent comprises a maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer.In the application, the specific kind of phosphorus flame retardant, anti-noise auxiliary agent and filler are compounded, which is beneficial to improving the wet heat aging resistance of the PC / ABS polymer alloy, reducing the smoke density of the PC / ABS polymer alloy and enabling the polymer alloy to have the anti-noise effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to a polymer alloy and a preparation method and application thereof. BACKGROUND

[0002] Polycarbonate (PC) is an engineering plastic with high impact and high heat resistance, but its melt viscosity is large, it is difficult to process, and it is sensitive to notches. Acrylonitrile-butadiene-styrene (ABS) resin is a thermoplastic high polymer material with high strength, high toughness and easy processing, but it has poor thermal stability. By combining the two, the advantages of the two resins can be combined and the disadvantages of the two can be overcome, and a PC / ABS alloy material with excellent performance can be obtained, which can be widely used in various fields, especially in the automotive field.

[0003] At present, PC / ABS alloy materials are needed for many interior parts of automobiles, and the interior of an automobile generally requires a smoke density of less than or equal to 75. With the electric vehicles represented by BYD and Yutong starting to be electric and "going out" to humid and hot regions such as Africa, South America and Southeast Asia, higher requirements are put forward for the hygrothermal aging performance of the interior materials in order to adapt to the natural environment of high temperature and high humidity. At the same time, after the electricization of new energy vehicles, the background noise of the engine decreases rapidly, and the "abnormal noise problem" caused by the assembly and extrusion of the interior parts is particularly prominent. Therefore, the traditional automotive interior PC / ABS alloy material also needs to be upgraded to cope with the abnormal noise problem.

[0004] Patents CN105431486A and CN105209312A use polycarbonates with special m-benzene structures and polycarbonate-siloxane copolymers to prepare halogen-free flame-retardant composites by adding bisphenol A bis(diphenyl phosphate) (BDP), polyetherimide (PEI) and the like, which can obtain a low smoke density material. For example, patent CN102604315A discloses a low smoke density PC / ABS alloy for automotive interior parts, which can effectively reduce the smoke density of the PC / ABS alloy by using zinc borate, molybdenum trioxide, ammonium octamolybdate and zinc molybdate and the like. However, the hygrothermal aging resistance and abnormal noise resistance of the PC / ABS alloy material disclosed in the foregoing patents need to be further improved.

[0005] Therefore, it is an urgent problem in the field to develop a halogen-free polymer alloy material with low smoke density, excellent hygrothermal aging resistance and abnormal noise resistance. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a polymer alloy and a preparation method and application thereof.The polymer alloy has excellent wet heat aging resistance, low smoke density, and good anti-abnormal sound effect, and the polymer is halogen-free, and also has low odor and low emission.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a polymer alloy, which comprises 60-80 parts by weight of polycarbonate, 8-20 parts by weight of acrylonitrile-butadiene-styrene copolymer, 5-12 parts by weight of phosphorus-based flame retardant, 1-6 parts by weight of anti-abnormal sound additive, and 0.8-5 parts by weight of filler; the phosphorus-based flame retardant comprises phosphazene flame retardant; the filler comprises talc; and the anti-abnormal sound additive comprises maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer.

[0009] In the present application, the specific types of phosphorus-based flame retardant, anti-abnormal sound additive, and filler are compounded, which is beneficial to improve the wet heat aging resistance of PC / ABS polymer alloy, reduce its smoke density, and also make the polymer alloy have the effect of anti-abnormal sound.

[0010] In the present application, 60-80 parts of polycarbonate, for example, can be 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, 76 parts, 77 parts, 78 parts, 79 parts, 80 parts, or a range consisting of any of the above values; preferably 62-78 parts, more preferably 65-75 parts.

[0011] In the present application, 8-20 parts of acrylonitrile-butadiene-styrene copolymer, for example, can be 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts, 19.5 parts, 20 parts, or a range consisting of any of the above values; preferably 10-19.5 parts, more preferably 12-18 parts.

[0012] In the present application, the 5-12 parts of phosphorus flame retardant, for example, can be 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, 6 parts, 6.2 parts, 6.4 parts, 6.6 parts, 6.8 parts, 7 parts, 7.2 parts, 7.4 parts, 7.6 parts, 7.8 parts, 8 parts, 8.2 parts, 8.4 parts, 8.6 parts, 8.8 parts, 9 parts, 9.2 parts, 9.4 parts, 9.6 parts, 9.8 parts, 10 parts, 10.2 parts, 10.4 parts, 10.6 parts, 10.8 parts, 11 parts, 11.2 parts, 11.4 parts, 11.6 parts, 11.8 parts, 12 parts or a range consisting of any of the above values; preferably 6.5-10.5 parts, more preferably 7.5-9.5 parts.

[0013] In the present application, the 1-6 parts of anti-abnormal sound auxiliary agent, for example, can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, 6 parts or a range consisting of any of the above values; preferably 1.2-5.5 parts, more preferably 1.5-4.5 parts.

[0014] In the present application, the 0.8-5 parts of filler, for example, can be 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts or a range consisting of any of the above values; preferably 1-3 parts, more preferably 2-2.6 parts.

[0015] In the present application, the grafting rate of the maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer is 0.5-2%, for example, can be 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2% and the like; the test method of the grafting rate includes acid-base titration method.

[0016] Preferably, the phosphazene flame retardant includes a cyclic phosphazene compound.

[0017] Preferably, the cyclic phosphazene compound accounts for 60-100% of the total mass of the phosphazene flame retardant, for example, can be 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, 100% and the like.

[0018] Preferably, the cyclic phosphazene compound comprises compound A and / or compound B; the compound A comprises hexaphenoxycyclotriphosphazene; the compound B comprises at least one of hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene, hexakis(4-aminophenoxy)cyclotriphosphazene, hexakis(p-carboxyphenoxy)cyclotriphosphazene or tris(m-benzyloxy)cyclotriphosphazene, more preferably the compound B comprises at least one of hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene, hexakis(4-aminophenoxy)cyclotriphosphazene or hexakis(p-carboxyphenoxy)cyclotriphosphazene.

[0019] Preferably, the cyclic phosphazene compound comprises compound A and compound B, the mass ratio of the compound A to the compound B is (0.4-3.6):1, wherein the specific value in (0.4-3.6) can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6 or a range composed of any of the above values; further preferably (1-3):1, more preferably (1.4-2.6):1.

[0020] Preferably, the anti-abnormal sound auxiliary agent further comprises ultra-high molecular weight polyethylene.

[0021] Preferably, the anti-abnormal sound auxiliary agent comprises maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer and ultra-high molecular weight polyethylene, the mass ratio of the maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer to the ultra-high molecular weight polyethylene is 1:(0.1-0.9), wherein the specific value in (0.1-0.9) can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9 or a range composed of any of the above values; more preferably 1:(0.3-0.6).

[0022] Preferably, the average particle size of the talc is 1-10 μm, for example, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm or a range composed of any of the above values; further preferably 3-8 μm; more preferably 4-6 μm.

[0023] Preferably, the filler further comprises a second filler, the second filler comprises boron nitride and / or silicon nitride.

[0024] In the present application, the average particle size of the second filler is 4-15 μm, for example, it can be 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm or a range consisting of any of the above values.

[0025] In the present application, the average particle size of the talc and the second filler can be tested by light scattering method.

[0026] Preferably, the filler comprises talc and a second filler, and the mass ratio of the talc to the second filler is 1:(0.2-0.8), wherein the specific value in (0.2-0.8) can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 and a range consisting of any of the above values; more preferably 1:(0.35-0.55).

[0027] Preferably, the polymer alloy further comprises 2-5 parts of a toughening agent by weight, for example, it can be 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5 parts or a range consisting of any of the above values; further preferably 3.5-4.5 parts.

[0028] Preferably, the toughening agent comprises maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer and / or methyl methacrylate-butadiene-styrene copolymer.

[0029] Preferably, the polymer alloy further comprises 0.2-1 parts of an antioxidant (for example, it can be 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part or a range consisting of any of the above values) and / or 0.2-1 parts of a lubricant (for example, it can be 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part or a range consisting of any of the above values) by weight.

[0030] Preferably, the antioxidant comprises at least one of hindered phenolic antioxidant, thioester antioxidant, phosphite antioxidant or hindered amine antioxidant.

[0031] Preferably, the lubricant comprises at least one of magnesium stearate, pentaerythritol stearate, ethylene bis-stearamide or polyethylene wax.

[0032] In the present application, the polycarbonate can be a bisphenol A type polycarbonate; the polycarbonate can be a phosgene method produced polycarbonate, which can be purchased on the market; the melt index of the polycarbonate is 8-12 g / 10 min, for example, it can be 8 g / 10 min, 8.5 g / 10 min, 9 g / 10 min, 9.5 g / 10 min, 10 g / 10 min, 10.5 g / 10 min, 11 g / 10 min, 11.5 g / 10 min, 12 g / 10 min or a range consisting of any of the above values according to standard ISO 1133-1:2022, test conditions 300℃, 1.2kg.

[0033] In the present application, the mass percentage of polycarbonate in the polymer alloy is ≥60%, for example, it can be 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90% or a range between any of the above values; more preferably, the mass percentage of polycarbonate is ≥65%.

[0034] In the present application, the acrylonitrile-butadiene-styrene copolymer can be a bulk method produced acrylonitrile-butadiene-styrene copolymer, which can be purchased on the market; the melt index of the acrylonitrile-butadiene-styrene copolymer is 15-25 g / 10 min, for example, it can be 15 g / 10 min, 16 g / 10 min, 17 g / 10 min, 18 g / 10 min, 19 g / 10 min, 20 g / 10 min, 21 g / 10 min, 22 g / 10 min, 23 g / 10 min, 24 g / 10 min, 25 g / 10 min or a range consisting of any of the above values according to standard ISO 1133-1:2022, test conditions 220℃, 10kg.

[0035] As a preferred technical solution of the present application, the polymer alloy comprises 65-75 parts by weight of polycarbonate, 12-18 parts by weight of acrylonitrile-butadiene-styrene copolymer, 6.5-10.5 parts by weight of phosphorus-based flame retardant, 1.8-4.5 parts by weight of anti-noise aid, 1-3 parts by weight of filler, 2-5 parts by weight of toughening agent, 0.2-1 parts by weight of antioxidant and 0.2-1 parts by weight of lubricant.

[0036] In a second aspect, the present application provides a preparation method of the polymer alloy according to the first aspect, the preparation method comprising the following steps:

[0037] The polycarbonate, acrylonitrile-butadiene-styrene copolymer, phosphorus-based flame retardant, anti-noise aid and filler are mixed and extruded to obtain the polymer alloy.

[0038] Preferably, the mixed material further comprises at least one of a toughening agent, an antioxidant or a lubricant.

[0039] Preferably, the extrusion temperature is 180-280℃.

[0040] In the present application, the extrusion is performed in a twin-screw extruder, which is a co-rotating twin-screw extruder, the length-diameter ratio of the screw is 25-48, and the screw barrel is provided with a vacuum exhaust device and a temperature control device; wherein the vacuum degree is-0.08 to-0.1 MPa, the temperature of the feeding conveying section is 190-220℃, the temperature of the core plasticizing section is 240-260℃, the temperature of the post-homogenizing extrusion section is 260-270℃, and the screw rotation speed is 400-600 rpm.

[0041] In the present application, the extrusion is further followed by the steps of cooling, drying and pelletizing.

[0042] In a third aspect, the present application provides an automotive interior material, which comprises the polymer alloy according to the first aspect.

[0043] The numerical range in the present application not only includes the point values listed above, but also includes any point values between the above numerical ranges that are not listed, and for the sake of brevity and simplicity, the present application does not exhaustively list the specific point values included in the range.

[0044] Compared with the prior art, the present application has the following beneficial effects:

[0045] The polymer alloy provided by the present application can have excellent wet heat aging resistance, low smoke density and good anti-noise effect by using specific types of phosphorus-based flame retardants, anti-noise additives and fillers, and the material is environmentally friendly. DETAILED DESCRIPTION

[0046] The technical solutions of the present application will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only to help understand the present application and should not be regarded as specific limitations of the present application.

[0047] The materials used in the present application can be purchased on the market or prepared by conventional methods; unless otherwise specified, the materials used in the present application are as follows:

[0048] PC resin: S-2000F, Japan Mitsubishi.

[0049] ABS resin: ABS 8434, Kaoqiao Petrochemical.

[0050] Flame retardant: Hexaphenoxycyclotriphosphazene, Hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene, Tris(4-tert-butylphenoxy)cyclotriphosphazene, Bisphenol A bis(diphenyl phosphate) are all commercially available.

[0051] Anti-rust agent: Maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymer (MAH-g-SEBS, Kraton FG1901, maleic anhydride grafting rate 1.5%); Ultra-high molecular weight polyethylene (UHMWPE, Japan Mitsui Chemical UHMWPE-540RU); Styrene-hydrogenated ethylene-styrene copolymer, USA Kraton 1152.

[0052] Filler:

[0053] Talc 1: D50 particle size 4.25 μm, Liaoning Xida SDC-9489;

[0054] Talc 2: D50 particle size 5.5-6.0 μm, Liaoning Xida Talc Group Co., Ltd. SD-8072;

[0055] Talc 3: Talc 1 is ground to D50 particle size 1.5 μm;

[0056] Talc 4: D50 particle size 9-11 μm, Liaoning Xida Talc Group Co., Ltd. SD-9012;

[0057] Silicon nitride: D50 particle size 5 μm, purchased from Beijing Xingrongyuan Technology Co., Ltd.

[0058] Toughening agent: Maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer (MAH-g-ABS, Shenyang Ketong KT-2), methyl methacrylate-butadiene-styrene copolymer (MBS, Rohm&Haas 2620).

[0059] Lubricant: Pentaerythritol stearate, Germany Cognis LOXIOL P 861 / 3.5.

[0060] Antioxidant: A mixture of BASF antioxidant 1010 (Tetrakis[β-(3,5-di-tert-butyl-4- hydroxyphenyl)propionic acid]pentaerythritol ester) and antioxidant 168 (Tris[2.4-di-tert- butylphenyl]phosphite) at a mass ratio of 1:1.

[0061] Examples 1-24, Comparative Examples 1-7

[0062] Examples 1-24 and Comparative Examples 1-7 each provide a polymer alloy, the formulation of which is shown in Table 1 in parts by weight; wherein " / " means that the component is not included in the formulation; the polymer alloy is prepared by mixing PC resin, ABS resin, toughening agent, phosphorus-based flame retardant, anti-noise aid, filler, antioxidant and lubricant, and then feeding into the main cylinder of a twin-screw extruder (screw diameter 35 mm, length-diameter ratio L / D = 48) for extrusion, wherein the temperature control of each section of the main cylinder (from the feeding port to the exit of the machine head) is 190°C, 240°C, 250°C, 260°C, 260°C, 265°C, 270°C in turn, and the rotation speed of the twin screw is 500 rpm; the material obtained by extrusion is cooled, dried and granulated to obtain the polymer alloy.

[0063] Table 1

[0064]

[0065] Table 2

[0066]

[0067]

[0068] Table 3

[0069]

[0070] Table 4

[0071]

[0072]

[0073] Table 5

[0074]

[0075] Performance Test

[0076] The polymer alloys provided by Examples 1-24 and Comparative Examples 1-7 are dried in a forced air oven at 100°C for 4 hours, and then injection molded into standard bars and plates using an injection molding machine. The molded bars are placed in an environment with a relative humidity of 50±5% and a temperature of 23±2°C for at least 24 hours before being tested for the following properties.

[0077] (1) Charpy Notched Impact Strength Test: A type of notches are injection molded according to the ISO 179-2010 standard, and the test conditions are tested at room temperature.

[0078] (2) Vicat Softening Temperature: tested according to the B 50 method in the standard ISO 306-2013.

[0079] (3) Anti-rustling test: according to the standard VDA230-206-2005, the risk coefficient (RPN) of rustling is tested.

[0080] (4) Smoke density: according to GB / T 8627-2007, the test is carried out.

[0081] (5) Moisture and heat aging resistance test: the sample bar (ISO 1A tensile sample bar) obtained by injection molding is aged at a temperature of 85℃ and a humidity of 85% for 1000h, and the tensile strength before and after aging is tested according to the standard ISO 527-1:2019, and the tensile property retention rate is calculated, the tensile property retention rate = tensile strength after aging / tensile strength before aging x 100%.

[0082] The specific test results are shown in Table 6.

[0083] Table 6

[0084]

[0085]

[0086] As can be seen from Table 6, the polymer alloy provided by the application can have excellent moisture and heat aging resistance, low smoke density and good anti-rustling effect by using specific types of phosphorus-based flame retardants, anti-rustling aids and fillers. The polymer alloy has a simple supported beam notched impact strength >49KJ / m 2 , a Vicat softening temperature >105℃, an RPN value <6, a smoke density <61, a tensile property retention rate >94% after aging at a temperature of 85℃ and a humidity of 85% for 1000h.

[0087] As can be seen from Comparative Examples 1-3, the polymer alloy has high smoke density, poor anti-rustling effect and poor aging resistance without specific types of phosphorus-based flame retardants, anti-rustling aids or filler compounding.

[0088] As can be seen from Comparative Examples 4-6, the polymer alloy has high smoke density, poor anti-rustling effect and poor aging resistance when one of the phosphorus-based flame retardants, anti-rustling aids and fillers is missing,

[0089] As can be seen from Comparative Example 7, the polymer alloy has low simple supported beam notched impact strength, poor aging resistance, poor anti-rustling effect and increased smoke density when PC and ABS are not compounded in a specific ratio.

[0090] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above-described specific embodiments are merely examples of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A polymer alloy, characterized in that, By weight, the polymer alloy comprises 60-80 parts polycarbonate, 8-20 parts acrylonitrile-butadiene-styrene copolymer, 5-12 parts phosphorus flame retardant, 1-6 parts anti-noise additive and 0.8-5 parts filler; The phosphorus-based flame retardant includes compound A and / or compound B; Compound A includes hexaphenoxycyclotriphosphazene; Compound B includes at least one of hexa(4-hydroxymethylphenoxy)cyclotriphosphazene and tri(o-phenyldioxy)cyclotriphosphazene; The filler includes talc powder; The anti-noise additive includes maleic anhydride-grafted styrene-ethylene-butadiene-styrene copolymer.

2. The polymer alloy according to claim 1, characterized in that, The mass ratio of compound A to compound B is (0.4~3.6):

1.

3. The polymer alloy according to claim 2, characterized in that, The mass ratio of compound A to compound B is (1.4~2.6):

1.

4. The polymer alloy according to claim 1, characterized in that, The noise-reducing additive also includes ultra-high molecular weight polyethylene.

5. The polymer alloy according to claim 4, characterized in that, The anti-noise additive comprises maleic anhydride-grafted styrene-ethylene-butadiene-styrene copolymer and ultra-high molecular weight polyethylene, wherein the mass ratio of maleic anhydride-grafted styrene-ethylene-butadiene-styrene copolymer to ultra-high molecular weight polyethylene is 1:(0.1~0.9).

6. The polymer alloy according to claim 5, characterized in that, The anti-noise additive comprises maleic anhydride-grafted styrene-ethylene-butadiene-styrene copolymer and ultra-high molecular weight polyethylene, wherein the mass ratio of maleic anhydride-grafted styrene-ethylene-butadiene-styrene copolymer to ultra-high molecular weight polyethylene is 1:(0.3~0.6).

7. The polymer alloy according to claim 1, characterized in that, The average particle size of the talc powder is 1~10 μm.

8. The polymer alloy according to claim 7, characterized in that, The average particle size of the talc powder is 3~8 μm.

9. The polymer alloy according to claim 1, characterized in that, The filler also includes a second filler comprising boron nitride and / or silicon nitride.

10. The polymer alloy according to claim 1, characterized in that, The filler includes talc powder and a second filler, wherein the mass ratio of talc powder to the second filler is 1:(0.2~0.8).

11. The polymer alloy according to claim 10, characterized in that, The filler includes talc powder and a second filler, wherein the mass ratio of talc powder to the second filler is 1:(0.35~0.55).

12. The polymer alloy according to claim 1, characterized in that, The polymer alloy further includes 2 to 5 parts by weight of toughening agent.

13. The polymer alloy according to claim 12, characterized in that, The toughening agent includes maleic anhydride-grafted acrylonitrile-butadiene-styrene copolymer and / or methyl methacrylate-butadiene-styrene copolymer.

14. The polymer alloy according to claim 1, characterized in that, The polymer alloy further comprises, by weight, 0.2 to 1 part antioxidant and / or 0.2 to 1 part lubricant.

15. The polymer alloy according to claim 14, characterized in that, The antioxidant includes at least one of hindered phenolic antioxidants, thioester antioxidants, phosphite antioxidants, or hindered amine antioxidants.

16. The polymer alloy according to claim 14, characterized in that, The lubricant includes at least one of magnesium stearate, pentaerythritol stearate, ethylene bis-stearamide, or polyethylene wax.

17. The polymer alloy according to claim 1, characterized in that, By weight, the polymer alloy comprises 65-75 parts polycarbonate, 12-18 parts acrylonitrile-butadiene-styrene copolymer, 6.5-10.5 parts phosphorus flame retardant, 1.8-4.5 parts anti-noise additive, 1-3 parts filler, 2-5 parts toughening agent, 0.2-1 part antioxidant and 0.2-1 part lubricant.

18. A method for preparing a polymer alloy according to any one of claims 1 to 17, characterized in that, The preparation method includes the following steps: Polycarbonate, acrylonitrile-butadiene-styrene copolymer, phosphorus-based flame retardant, anti-noise additive and filler are mixed and extruded to obtain the polymer alloy.

19. The preparation method according to claim 18, characterized in that, The mixture also includes at least one of toughening agents, antioxidants, or lubricants.

20. The preparation method according to claim 18, characterized in that, The extrusion temperature is 180~280℃.

21. An automotive interior material, characterized in that, The automotive interior material includes the polymer alloy according to any one of claims 1 to 17.

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