PMMA / ASA alloy and preparation method and application thereof

Abstract

The invention relates to a PMMA / ASA (polymethyl methacrylate / acrylonitrile styrene acrylate) alloy as well as a preparation method and application thereof. The PMMA / ASA alloy comprises the following components in parts by weight: 30-80 parts of PMMA, 20-50 parts of ASA, 2-10 parts of silicone powder and 2-10 parts of metallic pigment. According to the invention, the formula of the PMMA / ASA alloy is designed, and the metal pigment and the silicone powder are compounded, so that the alloy material has metal texture, low gloss and better mechanical properties than the PMMA / ASA alloy without the metal pigment. The process conditions of paint spraying and electroplating are avoided, the production efficiency is improved, the production cost is reduced, and environmental pollution caused by paint spraying or electroplating is reduced.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a PMMA / ASA alloy, its preparation method, and its applications. Background Technology

[0002] Polymethyl methacrylate (PMMA, acrylic) is an amorphous thermoplastic polymer with polar ester groups and rigid methyl groups in its main chain, giving it excellent light transmittance, chemical resistance, and surface decorative properties. It is widely used in optical devices and decorative materials. Acrylonitrile-styrene-acrylate copolymer (ASA), with an acrylate rubber core and a styrene-acrylonitrile shell, does not contain double bonds and possesses excellent weather resistance, mechanical strength, and processing fluidity, making it an ideal material for outdoor applications and structural components.

[0003] PMMA and ASA molecules have a certain degree of compatibility, and their alloys can integrate the translucent and decorative properties of PMMA with the weather resistance and impact resistance of ASA, making them widely used in automotive exteriors, home appliance panels, and other fields. The current market demands a dual requirement for this type of alloy: a "metallic appearance + low gloss." Traditional processes that achieve metallic effects through painting and electroplating suffer from high VOC emissions, environmental pollution, and easy coating peeling, which does not align with the trend of green manufacturing.

[0004] In existing technologies, some solutions attempt to directly add metallic pigments to PMMA / ASA alloys or use metallic pigment masterbatches, but these methods reveal several drawbacks: First, metallic pigments have poor dispersibility, easily agglomerating to form bright spots or streaks, resulting in uneven appearance; second, metallic pigments disrupt the continuity of the alloy matrix, significantly reducing impact and tensile strength; third, the high reflectivity of metallic pigments contradicts the requirement for low gloss, making it difficult to achieve precise gloss control through simple addition, and failing to meet the low gloss standards for automotive interiors and other scenarios (typically requiring a gloss level of ≤30 GU at 60°). Even using metallic pigment resin masterbatches to improve dispersibility still has significant shortcomings: the masterbatch carrier resin has poor compatibility with the PMMA / ASA matrix, easily forming interface defects, further deteriorating the alloy's impact resistance; the metallic pigment concentration in the masterbatch is fixed, making it difficult to flexibly adjust the metallic texture of the alloy according to requirements, and uneven masterbatch dispersion can easily lead to localized metallic pigment enrichment, exacerbating gloss fluctuations; furthermore, the additional masterbatch preparation process increases material production costs, and some carrier resins may reduce the alloy's weather resistance, contradicting the weather resistance advantages of ASA.

[0005] Therefore, developing a PMMA / ASA alloy material that requires no spraying and possesses both a metallic texture and low gloss has become an urgent problem to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a PMMA / ASA alloy, its preparation method, and its application. By designing the formulation of the PMMA / ASA alloy, a PMMA / ASA alloy material that requires no spraying and possesses both metallic texture and low gloss has been developed.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a PMMA / ASA alloy, wherein the PMMA / ASA alloy comprises the following components by weight: 30-80 parts PMMA, 20-50 parts ASA, 2-10 parts silicone powder, and 2-10 parts metallic pigment.

[0009] This invention adds metallic pigments to PMMA / ASA alloys to impart a metallic texture to the alloy material. It further combines silicone powder, whose low surface energy characteristics can form a lubricating interface to weaken light reflection. The flake-like structure of the metallic pigments disrupts the regular refraction of light. The combination of the two can block light from the surface and the surface structure of the material. The two double superimposed matting effects not only reduce the gloss of the alloy material, but also solve the problem of the metallic pigments disrupting the continuity of the alloy matrix, which leads to a decrease in the mechanical properties of the alloy.

[0010] Preferably, the D50 particle size of the metallic pigment is 10-50 μm, for example, it can be 10 μm, 20 μm, 30 μm, 40 μm or 50 μm.

[0011] This invention does not limit the selection of metallic pigments; conventional commercially available metallic pigments can be combined with silicone powder to achieve the technical effect of reducing the gloss of alloy materials.

[0012] Preferably, the mass ratio of the silicone powder to the metallic pigment is 1:(0.5-2), for example, it can be 1:0.5, 1:1, 1:1.5 or 1:2, etc.

[0013] This invention limits the mass ratio of silicone powder to metallic pigment. If there is too little metallic pigment (i.e., too much silicone powder), the metallic luster effect will be significantly weakened or even disappear, resulting in insufficient metallic texture. At the same time, the auxiliary reinforcing effect of the metallic pigment is basically lost, and the metallic texture-related properties of the product (such as the strength of the wear-resistant layer) will decrease. If there is too much metallic pigment (i.e., too little silicone powder), the surface matte effect will also be weakened. In addition, excessive metallic pigment may agglomerate, leading to uneven surface gloss, a grainy texture, and even affecting the mechanical strength of the product (such as becoming brittle).

[0014] Preferably, the PMMA / ASA alloy further comprises, by weight, any one or a combination of at least two of the following: 2-5 parts compatibilizer, 2-5 parts lubricant, 2-5 parts coupling agent, 0.5-2 parts light stabilizer, 0.5-2 parts ultraviolet absorber, or 0.5-2 parts antioxidant.

[0015] Among them, 2-5 portions can be, for example, 2 portions, 3 portions, 4 portions or 5 portions; 0.5-2 portions can be, for example, 0.5 portions, 1 portion, 1.5 portions or 2 portions.

[0016] Preferably, the compatibilizer comprises MBS.

[0017] Preferably, the lubricant comprises any one or a combination of at least two of the following: silane polymer, solid paraffin, liquid paraffin, fatty acid salt, calcium stearate, zinc stearate, fatty amide, methyl bis-stearamide, oleamide, stearamide, ethylene bis-stearamide, or N,N-ethylene bis-stearamide.

[0018] Preferably, the coupling agent comprises γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, γ-ureapropyltriethoxysilane, N-aminoethyl-γ-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, polyaminoalkyltrialkoxysilane, anilinemethyltrimethoxysilane, tris(dioctylphosphoyl)titanate isopropyl, triisostearate isopropyl, isopropyl dioleoyloxy(dioctylphosphoyl)titanate isopropyl, and isopropyl dioleo ... The following are included in the list of tetraisopropyl tri(dioctylphosphoyloxy)titanate, isopropyl trioleoyloxytitanate, isopropyl tri(dioctylpyrophosphate)titanate, bis(dioctyloxypyrophosphate)ethylenetitanate, bis(dioctyloxypyrophosphate)ethylenetitanate and triethanolamine chelates, tetraisopropyl di(dioctylphosphite)titanate, distearate isopropyl aluminate, isopropoxydistearate aluminate, trimethyl aluminate, triisopropyl aluminate, tribenzyl aluminate, alkoxytris(vinylethoxy)zirconate, alkoxytris(p-aminophenoxy)zirconate, bis(diethyl citrate)dipropoxyzirconate chelate, or tetra(triethanolamine)zirconate, or any one or a combination of at least two of these.

[0019] Preferably, the light stabilizer comprises any one or a combination of at least two of the following: 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, bis(1,2,2,6,6-pentamethylpiperidinol) sebacate, 2,2,6,6-tetramethylpiperidinol benzoate, a polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, or poly[[6-[(1,1,3,3-tetramethylbutyl)imino]-1,3,5-triazine-2,4-diyl][2-(2,2,6,6-tetramethylpiperidinyl)-subamino-hexamethylene-[4-(2,2,6,6-tetramethylpiperidinyl)-subamino]].

[0020] Preferably, the ultraviolet absorber includes any one or a combination of at least two of the following: benzoic acid esters, salicylic acid esters, benzophenones, benzotriazoles, or triazine ultraviolet absorbers.

[0021] Preferably, the ultraviolet absorber includes 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-bis(α,α-dimethylbenzyl)phenyl)benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole, and 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole. 2-(2'-hydroxy-4'-benzoylphenyl)-5-chloro-2H-benzotriazole, resorcinol monobenzoate, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-octoxyphenol, 2,4,6-tris(2'-butoxyphenyl)-1,3,5-triazine, 2-(4,6-diphenyl-1,3,5-triazin-2)-5-hexaneoxyphenol, phenyl salicylate, 4-isopropylbenzyl salicylate, 2-ethylhexyl salicylate, or hexamethylphosphoryltriamine, or any one or a combination of at least two of these.

[0022] Preferably, the antioxidant comprises tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butyl) phosphite, hindered phenol (3 The following are all of the following: octadecyl 5-dibutyl-4-hydroxyphenylpropionate, 1,3,5-tris(3,5-di-tert-butyl,4-hydroxybenzyl)triazine, 2,4,6-(1H,3H,5H)trione, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] or pentaerythritol distearate diphosphite.

[0023] In a second aspect, the present invention provides a method for preparing a PMMA / ASA alloy as described in the first aspect, the method comprising the following steps:

[0024] The components of the PMMA / ASA alloy are mixed and then melt-co-extruded to obtain the PMMA / ASA alloy.

[0025] Preferably, the mixing is carried out under stirring.

[0026] Preferably, the stirring speed is 550-650 rpm, for example, 550 rpm, 560 rpm, 580 rpm, 600 rpm, 620 rpm, 640 rpm, or 650 rpm.

[0027] Preferably, the mixing includes a first mixing and a second mixing.

[0028] Preferably, the first mixing involves mixing all components of the PMMA / ASA alloy except for the metallic pigment.

[0029] Preferably, the second mixing involves mixing the mixture obtained from the first mixing with a metallic pigment.

[0030] Preferably, the first mixing time is 6-10 minutes, for example, 6 minutes, 7 minutes, 8 minutes, 9 minutes or 10 minutes.

[0031] Preferably, the second mixing time is 20-40 s, for example, it can be 20 s, 25 s, 30 s, 35 s or 40 s.

[0032] Preferably, the melt co-extrusion is carried out in a twin-screw extruder.

[0033] Preferably, the rotational speed of the twin-screw extruder is 550-650 r / min, for example, it can be 550 r / min, 560 r / min, 580 r / min, 600 r / min, 620 r / min, 640 r / min or 650 r / min, etc.

[0034] Preferably, the residence time of the twin-screw extruder is 3-5 min, for example, it can be 3 min, 3.5 min, 4 min, 4.5 min or 5 min, etc.

[0035] Preferably, the temperature of the twin-screw extruder includes the following zones: Zone 1: 230-245℃; Zone 2: 235-255℃; Zone 3: 235-255℃; Zone 4: 240-260℃; Zone 5: 240-260℃; Zone 6: 245-265℃; Zone 7: 245-265℃; Zone 8: 245-265℃; Zone 9: 245-265℃; Zone 10: 245-265℃; and Zone 11: 240-260℃.

[0036] Among them, 230-245℃ can be, for example, 230℃, 235℃, 240℃ or 245℃, etc.; 235-255℃ can be, for example, 235℃, 240℃, 245℃, 250℃ or 255℃, etc.; 240-260℃ can be, for example, 240℃, 245℃, 250℃, 255℃ or 260℃, etc.; 245-265℃ can be, for example, 245℃, 250℃, 255℃, 260℃ or 265℃, etc.

[0037] Thirdly, the present invention provides an application of the PMMA / ASA alloy as described in the first aspect in automotive interior and exterior trim, communication equipment, and electronic appliances.

[0038] Compared with the prior art, the present invention has at least the following beneficial effects:

[0039] (1) The present invention designs the formulation of PMMA / ASA alloy by compounding metallic pigments and silicone powder, so that the alloy material has a metallic texture, low gloss and better mechanical properties than PMMA / ASA alloy without metallic pigments.

[0040] (2) The PMMA / ASA alloy provided by the present invention enables the injection-molded product to achieve the metallic effect brought about by painting and electroplating under the condition of avoiding the use of painting and electroplating processes, thereby improving production efficiency, reducing production costs, and reducing environmental pollution caused by painting or electroplating.

[0041] (3) The PMMA / ASA alloy material prepared by the present invention through compounding metallic pigments and silicone powder can achieve a tensile yield stress of 50-77 MPa, a flexural strength of 75-100 MPa, and a notched impact strength of 10-18.2 kJ / m. 2 Unnotched impact strength can reach 400-525 kJ / m 2 It has a gloss level of 1-5 GU, and features low gloss and excellent mechanical properties. Detailed Implementation

[0042] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0043] The specific information of the materials used in the following specific embodiments of the present invention is as follows:

[0044] PMMA, AG100, purchased from ROHM;

[0045] ASA, PW-957, purchased from Chi Mei;

[0046] Silicone powder, RM4-7051, purchased from Dow Corning;

[0047] Metallic pigment, 013-30-E1, purchased from Xingbolian;

[0048] Coupling agent, Z-603, purchased from Dow Corning;

[0049] Compatibilizer, M-220, purchased from Kanekachi, Japan;

[0050] Lubricant, VPG 861, purchased from Emery Oleochemicals, Germany;

[0051] Antioxidant 1010, purchased from BASF;

[0052] The ultraviolet absorber, Tinuvin 234, was purchased from BASF.

[0053] Examples 1-7 and Comparative Examples 1-5

[0054] Examples 1-7 and Comparative Examples 1-5 respectively provide a PMMA / ASA alloy and its preparation method. The specific composition of the PMMA / ASA alloy is shown in Table 1 (the amount of each component in the table is by weight), where "--" indicates that the component was not added.

[0055] The preparation method of the PMMA / ASA alloy includes:

[0056] The components of the PMMA / ASA alloy, excluding the metallic pigment, were added to a high-speed mixer according to their weight proportions and mixed for 8 minutes. Then, the metallic pigment was added and mixed for 30 seconds. The resulting mixture was then fed into a twin-screw extruder for melt co-extrusion. The extruder temperatures were: zone 1 240℃, zone 2 250℃, zone 3 250℃, zone 4 255℃, zone 5 255℃, zone 6 260℃, zone 7 260℃, zone 8 260℃, zone 9 260℃, zone 10 260℃, and zone 11 255℃. The screw speed was 600 r / min, and the residence time was 4 minutes. After extrusion, the mixture was cooled, dried, and pelletized to obtain the PMMA / ASA alloy.

[0057] Table 1

[0058]

[0059] Table 2

[0060]

[0061] Test methods

[0062] The PMMA / ASA alloys obtained in Examples 1-7 and Comparative Examples 1-3 were subjected to performance tests, and the test methods / standards are as follows:

[0063] (1) Tensile yield stress (MPa): Tested according to ISO 527 standard;

[0064] (2) Bending strength (MPa): Tested according to ISO 178 standard;

[0065] (3) Notched impact strength (kJ / m) 2 Tested according to ISO 180 standard, with test parameters of 3.2 mm, 23℃, and 4J.

[0066] (4) Unnotched impact strength (kJ / m) 2 Tested according to ISO 179 standard, with test parameters of 3.2 mm, 23℃, and 4J.

[0067] (5) Gloss (60°, GU): The gloss of the alloy was tested using a BYK gloss meter.

[0068] The test results are shown in Table 3 below:

[0069] Table 3

[0070]

[0071] The test results show that:

[0072] (1) As can be seen from Examples 1 to 7, the PMMA / ASA alloy material prepared by the present invention through compounding metallic pigments and silicone powder can achieve a tensile yield stress of 50-77 MPa, a flexural strength of 75-100 MPa, and a notched impact strength of 10-18.2 kJ / m. 2 Unnotched impact strength can reach 400-525 kJ / m 2 It has a gloss level of 1-5 GU, and features low gloss and excellent mechanical properties.

[0073] (2) As can be seen from Examples 1 and 4-7, by further limiting the mass ratio of metallic pigment to silicone, if there is too little metallic pigment (i.e., too much silicone powder), the metallic luster effect will be significantly weakened or even disappear, the metallic texture will be insufficient, and the auxiliary reinforcing effect of the metallic pigment will be basically lost, and the metallic texture-related properties of the product (such as the strength of the wear-resistant layer) will decrease. If there is too much metallic pigment (i.e., too little silicone powder), the surface matte effect will also be weakened, and excessive metallic pigment may agglomerate, resulting in uneven surface gloss, a grainy texture, and even affecting the mechanical strength of the product (such as becoming brittle).

[0074] (3) As can be seen from Example 1 and Comparative Examples 1-3, the present invention, by compounding metallic pigments and silicone powder, makes the alloy material have a metallic texture, low gloss, and better mechanical properties than PMMA / ASA alloy without metallic pigments.

[0075] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A PMMA / ASA alloy, characterized in that, The PMMA / ASA alloy comprises the following components by weight parts: PMMA 30-80 parts, ASA 20-50 parts, silicone powder 2-10 parts, metal pigment 2-10 parts.

2. The PMMA / ASA alloy according to claim 1, characterized in that The D50 particle size of the metal pigment is 10-50 μm.

3. PMMA / ASA alloy according to claim 1 or 2, characterized in that The mass ratio of the silicone powder and the metal pigment is 1: (0.5-2).

4. PMMA / ASA alloy according to any one of claims 1 to 3, characterized in that The PMMA / ASA alloy further comprises, by weight parts, any one or a combination of at least two of a compatibilizer 2-5 parts, a lubricant 2-5 parts, a coupling agent 2-5 parts, a light stabilizer 0.5-2 parts, a UV absorber 0.5-2 parts, or an antioxidant 0.5-2 parts.

5. The PMMA / ASA alloy according to claim 4, characterized in that The compatibilizer comprises MBS. Preferably, the lubricant comprises any one or a combination of at least two of silane polymer, solid paraffin, liquid paraffin, fatty acid salt, calcium stearate, zinc stearate, fatty acid amide, methylene bis-stearamide, oleic acid amide, stearamide, ethylene bis-stearamide, or N,N-ethylene bis-stearamide.

6. The PMMA / ASA alloy according to claim 4, characterized in that The coupling agent comprises any one or a combination of at least two of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, γ-ureidopropyltriethoxysilane, N-aminoethyl-γ-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, polyaminoalkyltrialkoxysilane, anilinomethyltrimethoxysilane, tri(dioctylphosphato)isopropyl titanate, triisostearyl titanate, isopropyl dioleatoxy(di-octylphosphato)titanate, isopropyl tri(di-octylphosphato)titanate, isopropyl trioleatoxytitanate, isopropyl tri(di-octylpyrophosphato)titanate, bis(di-octyloxy pyrophosphato)ethyl titanate, chelate of bis(di-octyloxy pyrophosphato)ethyl titanate and triethanolamine, tetraisopropyl bis(di-octylphosphato)titanate, distearyloxyisopropylaluminumate, isopropoxy distearatoxyaluminate, trimethylaluminate, triisopropylaluminate, tribenzylaluminate, alkoxy tri( vinyl-ethoxy)zirconate, alkoxy tri(p-aminophenoxy)zirconate, bis(limonodipropylate) dipropoxy zirconium chelate, or tetra(triethanolamine) zirconate.

7. The PMMA / ASA alloy according to claim 4, characterized in that The light stabilizer includes any one of or a combination of at least two of 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, bis(1,2,2,6,6-pentamethylpiperidinol) sebacate, benzoic acid 2,2,6,6-tetramethylpiperidine ester, a polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1 -piperidinoethanol, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, or poly[[6-[(1,1,3,3-tetramethylbutyl)imino]-1,3,5-triazine-2,4-diyl][2-(2,2,6,6-tetramethylpiperidyl)- hydrazino-hexamethylene-[4-(2,2,6,6-tetramethylpiperidyl)-hydrazino]]; Preferably, the ultraviolet absorber includes any one of or a combination of at least two of a benzoic acid ester, a salicylic acid ester, a benzophenone, a benzotriazole, or a triazine ultraviolet absorber; Preferably, the ultraviolet absorber includes any one of or a combination of at least two of 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di(α,α-dimethylbenzyl)phenyl)benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-di-tert- amylphenyl)benzotriazole, 2-(2'-hydroxy-4'-benzoic acid phenyl)-5-chloro-2H-benzotriazole, m- resorcinol monobenzoate, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-octyloxyphenol, 2,4,6-tris(2'-n-butyloxyphenyl)-1,3,5-triazine, 2-(4,6-diphenyl-1,3,5-triazin-2)-5-n-hexyloxyphenol, phenyl salicylate, salicylic acid-4-isopropylbenzyl ester, salicylic acid-2-ethylhexyl ester, or hexamethylphosphorus triamide; Preferably, the ultraviolet absorber includes any one of or a combination of at least two of 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di(α,α-dimethylbenzyl)phenyl)benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-di-tert- amylphenyl)benzotriazole, 2-(2'-hydroxy-4'-benzoic acid phenyl)-5-chloro-2H-benzotriazole, m- resorcinol monobenzoate, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-octyloxyphenol, 2,4,6-tris(2'-n-butyloxyphenyl)-1,3,5-triazine, 2-(4,6-diphenyl-1,3,5-triazin-2)-5-n-hexyloxyphenol, phenyl salicylate, salicylic acid-4-isopropylbenzyl ester, salicylic acid-2-ethylhexyl ester, or hexamethylphosphorus triamide; Preferably, the antioxidant comprises any one of or a combination of at least two of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythrityl tetra[β-(3,5-di-tert-butyl-4- hydroxyphenyl)propionate], N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl) hexanediamine, bis(2,4-di-tert-butylphenyl) pentaerythrityl diphosphite, n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butyl) phosphite, hindered phenol (3,5-dibutyl-4-hydroxy-phenyl propionic acid octadecyl ester), 1,3,5-tris(3,5-di-tert-butyl, 4-hydroxybenzyl) s-triazine, 2,4,6-(1H,3H,5H) triketone, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl) hexanediamine, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] or pentaerythrityl diphosphite distearyl ester.

8. A process for the production of a PMMA / ASA alloy according to any one of claims 1 to 7, characterized in that The preparation method comprises the following steps: mixing components of the PMMA / ASA alloy, melt co-extrusion to obtain the PMMA / ASA alloy.

9. The method of producing a PMMA / ASA alloy according to claim 8, characterized in that, The mixing is carried out under stirring; Preferably, the stirring speed is 550-650 rpm; Preferably, the mixing comprises first mixing and second mixing; Preferably, the first mixing is mixing components of the PMMA / ASA alloy except for metal pigments; Preferably, the second mixing is mixing the mixture obtained by the first mixing with metal pigments; Preferably, the first mixing time is 6-10 min; Preferably, the second mixing time is 20-40 s; Preferably, the melt co-extrusion is carried out in a twin-screw extruder; Preferably, the twin-screw extruder speed is 550-650 r / min; Preferably, the residence time of the twin-screw extruder is 3-5 min; Preferably, the temperature of the twin-screw extruder comprises a first zone temperature of 230-245°C, a second zone temperature of 235-255°C, a third zone temperature of 235-255°C, a fourth zone temperature of 240-260°C, a fifth zone temperature of 240-260°C, a sixth zone temperature of 245-265°C, a seventh zone temperature of 245-265°C, an eighth zone temperature of 245-265°C, a ninth zone temperature of 245-265°C, a tenth zone temperature of 245-265°C, and an eleventh zone temperature of 240-260°C.

10. Use of the PMMA / ASA alloy according to any one of claims 1-7 in automotive interior and exterior, communication equipment, electronic appliances.

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