A multifunctional, scratch- and chemical-resistant, spray-free PMMA / ASA composition and its preparation method

Abstract

This invention discloses a multifunctional, scratch-resistant, and chemical-resistant, paint-free PMMA / ASA composition and its preparation method. The composition comprises, by weight, the following components: 50-70 parts PMMA resin, 10-23 parts ASA adhesive powder, 8-20 parts SAN resin, 1-3 parts compatibilizer, 2-8 parts silicone toughening agent, 0.3-1 part superdispersant, 0.2-1 part antioxidant, 0.5-1 part scratch-resistant dispersing lubricant, 0.2-0.5 parts light stabilizer, and 0.3-1 parts metallic aluminum powder or pigment. This multifunctional, scratch-resistant, and chemical-resistant, paint-free PMMA / ASA composition possesses a high-gloss, scratch-resistant color or metallic effect, eliminating the need for painting; it also exhibits excellent resistance to chemical cracking such as acetic acid and cold-temperature impact toughness.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition and its preparation method. Background Technology

[0002] Polymethyl methacrylate (PMMA), also known as acrylic or plexiglass, possesses excellent optical properties due to its high transparency. It also exhibits excellent weather resistance, mechanical strength, good thermal and sound insulation, high gloss, strong coloring power, and scratch resistance. It is a rigid, colorless, and transparent material with excellent resistance to atmospheric aging. In the automotive industry, PMMA resin is used in window glass, instrument glass, headlights, and other components. However, it has high rigidity but poor impact toughness, making it a hard and brittle plastic. It is notch sensitive, prone to cracking under stress, and has poor cold resistance, easily becoming brittle at low temperatures. It has high melt viscosity, poor fluidity, and rapid cooling, making it prone to internal stress. While resistant to dilute inorganic acids, concentrated inorganic acids can corrode it. It has poor resistance to chemical reagents and solvents, swelling in glacial acetic acid and alcohols, leading to stress cracking. Therefore, its applications are limited.

[0003] ASA resin is an impact-modified resin copolymerized from terpolymers such as styrene, acrylonitrile, and acrylates. It possesses excellent mechanical and physical properties. Similar in structure to ABS, ASA is composed of acrylonitrile and butadiene rubber. It retains the excellent mechanical and physical properties of ABS as an engineering plastic, and due to the presence of acrylates, it exhibits strong weather resistance and good high-temperature resistance. It also has excellent colorability; products processed with ASA resin do not require painting, electroplating, or other surface protection and can be used directly outdoors. After 9-15 months of exposure to sunlight, its impact strength and elongation show almost no decrease, and its color remains virtually unchanged. ASA resin exhibits excellent weather resistance, good processability, chemical resistance, and balanced mechanical properties. However, general-purpose ASA resin also has disadvantages such as low heat distortion temperature and poor cold resistance, limiting its application in certain fields.

[0004] For this reason, PMMA / ASA alloy was developed to achieve high gloss, paint-free finish, and weather resistance.

[0005] 1) Chinese patent CN102464856A discloses a method for preparing a resin with a spray-free metallic effect. This method uses SAN-GMA copolymer to chemically coat and modify aluminum powder pigments, which improves the dispersion of aluminum powder pigments in plastic matrix and has excellent compatibility with plastic matrix resin.

[0006] 2) Chinese Patent CN113150480A discloses a high-gloss, high-black, paint-free, scratch-resistant, and ultra-weather-resistant PMMA / ASA alloy material, comprising the following components by weight: 60-80 parts PMMA; 15-35 parts ASA; 5-15 parts compatibilizer; 0.5-0.8 parts antioxidant; 0.3-0.5 parts lubricant; 0.4-1 part light stabilizer; and 0.5-1 part black powder. This produces a PMMA / ASA material with excellent mechanical properties and a high-gloss, high-black appearance similar to painted parts, as well as excellent weather resistance and scratch resistance. It can directly replace painted parts, solving the environmental and recycling problems associated with painted components. It can be widely used in automotive exterior parts, home appliances, outdoor sports equipment, and other fields.

[0007] 3) Chinese Patent CN106832723A discloses a high heat-resistant and high weather-resistant ASA / PMMA composite material and its preparation method. The composite material comprises the following components by weight percentage: 30-60% acrylonitrile-acrylate-styrene copolymer, 30-60% polymethyl methacrylate resin, 1-10% heat-resistant modifier, 1-5% compatibilizer, 1-3% black pigment, 0.1-1.5% light stabilizer, 0.1-1.5% ultraviolet absorber, 0.1-1.5% antioxidant, and 0.1-2% lubricant. The invented ASA / PMMA composite material exhibits excellent heat and weather resistance, high surface gloss, and excellent overall performance, with a Vicat softening point above 100℃.

[0008] The PMMA / ASA alloy materials disclosed in the above patents all utilize the advantages of their respective materials, such as weather resistance, high gloss, strong tinting strength, and impact toughness, to improve the notch sensitivity and toughness of PMMA and the gloss, hardness, and heat resistance of ASA. However, the chemical solvent resistance and cold resistance of PMMA and ASA have not been fundamentally improved. These materials are prone to cracking when exposed to chemical solvents and in low-temperature environments, affecting safety. Furthermore, their functionality is too limited, restricting their application. Summary of the Invention

[0009] One of the objectives of this invention is to provide a multifunctional, scratch-resistant, and chemical-resistant, paint-free PMMA / ASA composition with scratch-resistant, high-gloss or metallic colors that can be painted without the need for spraying; it also has excellent resistance to chemical cracking such as acetic acid and cold-temperature impact toughness.

[0010] The second objective of this invention is to provide a method for preparing the aforementioned multifunctional, scratch-resistant, and chemical-resistant, spray-free PMMA / ASA composition.

[0011] To achieve this objective, the present invention adopts the following technical solution:

[0012] On one hand, the present invention provides a multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition, comprising the following components by weight:

[0013]

[0014]

[0015] The multifunctional, scratch-resistant, and chemical-resistant, paint-free PMMA / ASA composition of the present invention has high gloss, requires no spraying, and has good surface scratch resistance; it also has good weather resistance, excellent resistance to cracking by chemical solvents such as acetic acid, good impact toughness and low-temperature impact toughness, prevents low-temperature embrittlement, and has excellent dispersibility for metallic pigments, which can present a metallic bright effect or high-gloss color.

[0016] Furthermore, the PMMA resin is a commercially available polymethyl methacrylate resin with a Rockwell hardness (M scale) greater than or equal to 85.

[0017] Preferably, the PMMA resin is selected from Asahi Kasei 560F or Mitsubishi MF-001.

[0018] Furthermore, the ASA rubber powder is commercially available high-rubber ASA powder with a rubber content of 50-70% and a rubber particle size of 100-150μm;

[0019] Preferably, the ASA adhesive powder is Japanese UMGA600N or Kumho XC-500A.

[0020] Furthermore, the melt flow rate of the SAN resin at 220℃ / 10kg is 10-40g / 10min.

[0021] Furthermore, the compatibilizer is a maleic anhydride-grafted polymer, with a maleic anhydride content of 3-25%;

[0022] Preferably, the compatibilizer is selected from any one or at least two of styrene-acrylonitrile-maleic anhydride copolymer, acrylate-maleic anhydride copolymer, styrene-acrylonitrile-glycidyl ester functional group-maleic anhydride copolymer, and styrene-maleic anhydride copolymer.

[0023] Preferably, the compatibilizer is any one of SMA-700, SMA-725, and SMA-800.

[0024] This invention uses high-flow styrene-acrylonitrile copolymer (SAN) and ASA powder to form ASA components with different hardness and toughness, which has better performance than using ASA resin directly. However, PMMA resin and ASA resin have poor compatibility, which easily leads to delamination and reduced impact performance. Maleic anhydride-grafted polymers (such as styrene-acrylonitrile-maleic anhydride copolymer) are selected as compatibilizers. The polar maleic anhydride groups at one end of the compatibilizer can react with the polar ester groups in PMMA resin, while the SAN groups at the other end have good compatibility with ASA resin. This improves the compatibility between PMMA and ASA, enhances the interfacial bonding between PMMA and ASA, and eliminates the formation of weld lines on the surface of the product during molding.

[0025] Furthermore, the organosilicon toughening agent has a core-shell structure with organosilicon / acrylic rubber as the core and methyl methacrylate as the shell;

[0026] Preferably, the organosilicon toughening agent contains 5-80% organosilicon;

[0027] Preferably, the organosilicon toughening agent is selected from Mitsubishi Rayon SRK-200A or Kanekachi MR502.

[0028] This invention introduces a core-shell structured silicone / acrylic toughening agent, with silicone / acrylic rubber as the core and methyl methacrylate (MMA) as the shell. The MMA shell groups of the toughening agent are tightly bonded to the MMA groups of PMMA, providing system compatibility. The silicone / acrylic rubber groups, acting as the core, provide low-temperature impact toughness, chemical resistance, and improved weather resistance. This solves the problems of cracking resistance to chemicals such as glacial acetic acid and low-temperature impact toughness in PMMA / ASA alloys.

[0029] Furthermore, the superdispersant is composed of 5-20% wt anchoring groups and 80-95% wt solvation chains;

[0030] Preferably, the anchoring group is selected from -R2N and -R3N. + -COOH, -SO3H, -SO 2- -PO4 2- One or at least two of polyamines, polyols, or polyethers;

[0031] Preferably, the solvation chain is selected from one or at least two of polyester, polyether, polyolefin or polyacrylate;

[0032] Preferably, the superdispersant is selected from Lubrizol DP-310 or Fenmei R1800-S.

[0033] The superdispersant added in this invention has anchoring groups that wet and adsorb inorganic pigments such as aluminum powder and carbon black, solving the problem of pigment dispersion. The solvation chain works with the maleic anhydride groups and MMA in the PMMA / ASA copolymer to increase the compatibility of PMMA and ASA. In other words, it ensures that the aluminum powder pigment is dispersed in the plastic matrix and has increased compatibility with the plastic matrix resin, while ensuring that the gloss of the composition is not affected. Therefore, it can produce a paint-free metallic effect and a high-gloss color.

[0034] Furthermore, the antioxidant is a mixture of phosphate ester antioxidants and hindered phenolic antioxidants in a mass ratio of 3 to 1:1.

[0035] Furthermore, the scratch-resistant dispersing lubricant is a polysiloxane lubricant containing reactive active groups; preferably, the scratch-resistant dispersing lubricant is selected from Degussa Tegomer V-Si 4042 or E525; since the addition of ASA adhesive powder and toughening agent has a certain impact on the surface hardness of PMMA / ASA, by adding a polysiloxane lubricant containing reactive active groups, the reactive active groups react and anchor with the matrix resin, increasing the wetting and dispersion of pigments and the compatibility of various components of the matrix resin, and the surface lubrication of polysiloxane groups thereby improving the surface scratch resistance and the release properties of the blend.

[0036] Preferably, the light stabilizer is selected from any one of UV-P, UV-770, UV-234, and UV-360.

[0037] Preferably, the aluminum powder or pigment is selected from brands such as Aika, Shucangke, or domestic brands.

[0038] In summary, the obtained PMMA / ASA composition has scratch-resistant, high-gloss or metallic colors that can be applied without spraying; it also has excellent resistance to chemical cracking such as acetic acid and cold-temperature impact toughness.

[0039] On the other hand, a method for preparing the aforementioned multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition is provided, comprising the following steps:

[0040] S1. Add the super dispersant and aluminum powder into a mixer and stir to disperse evenly, as component (I);

[0041] S2. Add ASA adhesive powder, SAN resin and compatibilizer into a mixer and stir evenly. Then add PMMA resin and silicone toughening agent and stir evenly. Finally add component (I) and antioxidant, scratch-resistant dispersing lubricant and light stabilizer and stir evenly to form component (II).

[0042] S3. Component (II) is fed into a twin-screw extruder and subjected to extrusion granulation, traction stripping, water cooling, dehydration, and pelletizing to produce a multifunctional, scratch-resistant, weather-resistant, and chemical-resistant paint-free PMMA / ASA composition.

[0043] Furthermore, the preparation method of the multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition includes the following steps:

[0044] S1. First, put the super-dispersant and the aluminum powder or pigment into a high-speed mixer according to the weight parts and stir and disperse at high speed for 5 minutes. The aluminum powder or pigment and the super-dispersant are fully wetted, meshed, adsorbed and dispersed evenly, as component (I).

[0045] S2. Add ASA adhesive powder, SAN resin, and compatibilizer to a mixer according to the weight ratio and stir for 5 minutes. Then add PMMA resin and silicone toughening agent and stir for 5 minutes. Finally, add component (I), antioxidant, scratch-resistant lubricant, and light stabilizer and stir for 5 minutes to make component (II).

[0046] S3. Component (II) is fed into the main feed hopper of a twin-screw extruder. It is then extruded and granulated through processes such as heating, melting, blending, plasticizing, and shearing dispersion in the twin-screw extruder. The main machine speed is 400-450 rpm and the extrusion temperature is 200-220℃. After traction, cooling in a water tank, dehydration, and pelletizing, a multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composite material is finally obtained.

[0047] The beneficial effects of this invention are:

[0048] 1. Core-shell structured silicone / acrylic toughening agents offer improved resistance to cracking by chemical solvents such as glacial acetic acid compared to existing products;

[0049] 2. Core-shell structured silicone / acrylic toughening agents provide increased low-temperature impact toughness and protection against low-temperature embrittlement compared to existing products;

[0050] 3. The addition of a super dispersant results in better dispersibility and compatibility compared to existing products, thus enabling the creation of metallic or high-gloss colors, rather than a single color.

[0051] 4. Compared with existing products, polysiloxane lubricants have better scratch resistance and release properties. Detailed Implementation

[0052] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0053] Unless otherwise specified, all raw materials used in this invention are commercially available or can be prepared using conventional methods in this technical field.

[0054] Example 1

[0055] 1. Add 0.5 parts by weight of superdispersant DP310 and 0.5 parts by weight of aluminum powder Aika ZP15-20B to a high-speed mixer and stir and disperse for 5 minutes; this is component (I).

[0056] 2. Add 22.5 parts of ASA adhesive powder UMGA600N, 20 parts of SAN resin NF2200, and 3 parts of compatibilizer SMA-700 to a mixer and stir for 5 minutes according to the mass ratio. Then add 50 parts of PMMA resin 560F and 2 parts of silicone toughening agent SRK-200A and stir for 5 minutes. Finally, add component (I), 0.3 parts of antioxidant (1076:168 = 2:1), 1 part of scratch-resistant dispersing lubricant Tegomer V-Si 4042, and 0.2 parts of light stabilizer UV-234 and stir for 5 minutes to form component (II).

[0057] 3. Component (II) is fed into the main hopper of a twin-screw extruder. The extrusion process involves heating, melting, blending, plasticizing, and shearing dispersion. The main extruder speed is 400 rpm. Extrusion temperatures are: Zone 1: 200℃, Zone 2: 210℃, Zone 3: 210℃, Zone 4: 210℃, Zone 5: 210℃, Zone 6: 210℃, Zone 7: 200℃, Zone 8: 200℃, Zone 9: 200℃, Zone 10: 200℃, Zone 11: 200℃, Zone 12: 200℃, and die head: 210℃. After traction, water cooling, dehydration, and pelletizing, a multifunctional, scratch-resistant, weather-resistant, and chemical-resistant paint-free PMMA / ASA composite material is finally obtained.

[0058] The preparation methods of Examples 2-5 and Comparative Examples 1-6 are basically the same as those of Example 1 above, except for the amount (parts by weight) of each raw material added, as detailed in Table 1.

[0059] Table 1. Amounts (parts by weight) of each raw material added in Examples 1-5 and Comparative Examples 1-6

[0060]

[0061] Performance testing:

[0062] 1. Using the multifunctional, scratch-resistant, weather-resistant, and chemical-resistant paint-free PMMA / ASA composite materials prepared in Examples 1-5 and Comparative Examples 1-6, ISO standard test strips and 1.5mm thick flame-retardant test strips were prepared at an injection molding temperature of 200-220℃. Tests were conducted according to the testing standards; the impact test strips were divided into two parts: one part was tested at room temperature, and the other part underwent a -30℃ low-temperature impact test.

[0063] 2. Cantilever beam notched impact strength: tested according to ISO 180.

[0064] 3. Scratch resistance: Tested according to SN / T4449-2016 "Test Method for Scratch Resistance of Automotive Interior Materials".

[0065] 4. Chemical resistance: Bend the flame-retardant strip 120° and immerse it in glacial acetic acid at room temperature, then observe the time it takes for the surface to crack.

[0066] The test results are shown in Table 2 below.

[0067] Table 2. Performance Test Results

[0068]

[0069] Note: Scratch resistance rating:

[0070] Level 1: Scratch lines are barely visible or completely invisible;

[0071] Level 2: Scratch lines are basically visible;

[0072] Level 3: The scratch lines are clearly visible, and the scratched surface shows changes in gloss or a polished appearance;

[0073] Level 4: The scratch lines are quite severe, and the scratched surface shows obvious whitening or discoloration;

[0074] Level 5: The scratch lines are very severe, and the surface is severely scratched or cracked.

[0075] As can be seen from Table 2, compared with Comparative Example 1, the scratch resistance level of Example 1 is level 1, which is better than the level 3 of Comparative Example 1. This is because an anti-scratch dispersing lubricant was added in Example 1, while no such lubricant was added in Comparative Example 1. It can be seen that the addition of the anti-scratch dispersing lubricant significantly improves the surface's anti-scratch performance.

[0076] Compared with Comparative Example 2, Example 2 exhibits significantly higher low-temperature impact performance at -30°C, and its acetic acid cracking resistance time of 8 minutes is longer than that of Comparative Example 2 (0.5 minutes). This is because Example 2 contains an organosilicon toughening agent, which effectively improves low-temperature impact toughness, prevents low-temperature embrittlement, and greatly enhances resistance to cracking by chemicals such as acetic acid, thus reducing the risk of low-temperature embrittlement and cracking upon contact with acetic acid or other chemicals.

[0077] Compared with Comparative Example 3, Example 3 has a higher impact strength than Comparative Example 3. Moreover, the weld line surface of Example 3 is not obvious, while the weld line surface of Comparative Example 3 is obvious. This is because Comparative Example 3 added compatibilizer and superdispersant, which improved the compatibility and dispersibility of each component. Compared with Comparative Example 3, which did not add compatibilizer and superdispersant, it has higher impact performance, weld line surface and better color gloss.

[0078] Compared with Comparative Example 4, Example 4 exhibits significantly higher low-temperature impact resistance at -30°C than Comparative Example 4. Furthermore, Example 2's acetic acid cracking resistance time of 10 minutes is longer than Comparative Example 4's 0.5 minutes, and its scratch resistance rating is also higher. This is because Example 4 contains an organosilicon toughening agent, which effectively improves low-temperature impact toughness, prevents low-temperature embrittlement, and greatly enhances resistance to cracking by chemicals such as acetic acid, reducing the risk of low-temperature embrittlement and cracking upon contact with acetic acid. Meanwhile, Comparative Example 4, lacking a scratch-resistant dispersing lubricant, has a surface scratch resistance rating of 3, making it more prone to scratching than Example 4, which contains a scratch-resistant dispersing lubricant.

[0079] Compared with Comparative Example 5, Example 5 exhibits a bright metallic color, uniform gloss dispersion, and no flow marks. Comparative Example 5 shows flow marks, agglomeration of the aluminum powder, and an uneven gloss. This is due to the addition of a superdispersant in Example 5. The anchoring groups in the superdispersant wet and adsorb the inorganic aluminum powder pigment, improving its dispersibility. The solvation chain, along with the maleic anhydride groups and MMA in the PMMA / ASA copolymer, increases the compatibility of the components, ensuring both dispersion of the aluminum powder pigment in the plastic matrix and increased compatibility with the plastic matrix resin, effectively preventing flow marks. Simultaneously, the gloss of the composition remains unaffected, ensuring a bright metallic effect.

[0080] Compared with Comparative Example 6, Example 5 showed improved impact strength because Comparative Example 6 did not add SAN and the amount of ASA adhesive powder was increased. However, the surface scratch resistance grade of 3 was lower than that of Example 5 (grade 1), and obvious scratches appeared. It can be seen that the addition of SAN resin helps to adjust the surface scratch resistance. At the same time, since SAN is cheaper than ASA adhesive powder, the addition of SAN in the example ensures the surface scratch resistance of the formulation system and makes the product more competitive in the market.

[0081] The above embodiments are only used to illustrate the detailed method of the present invention. The present invention is not limited to the above detailed method, that is, it does not mean that the present invention must rely on the above detailed method to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A multifunctional, scratch-resistant, and chemical-resistant, spray-free PMMA / ASA composition, characterized in that, By weight, it contains the following components: The compatibilizer is a maleic anhydride-grafted polymer with a maleic anhydride content of 3-25%. The organosilicon toughening agent has a core-shell structure with organosilicon / acrylic rubber as the core and methyl methacrylate as the shell. The superdispersant is composed of 5-20%wt anchoring groups and 80-95%wt solvation chains; The scratch-resistant dispersing lubricant is a polysiloxane lubricant containing reactive functional groups.

2. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The melt flow rate of the SAN resin at 220℃ / 10kg is 10-40g / 10min.

3. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The PMMA resin is commercially available and has a Rockwell hardness of 85 or higher.

4. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The PMMA resin is selected from Asahi Kasei 560F or Mitsubishi MF-001.

5. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The ASA rubber powder is a commercially available high-rubber ASA powder with a rubber content of 50-70% and a rubber particle size of 100-150μm.

6. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The ASA adhesive powder is either Japanese UMGA600N or Kumho XC-500A.

7. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The compatibilizer is selected from any one or at least two of styrene-acrylonitrile-maleic anhydride copolymer, acrylate-maleic anhydride copolymer, and styrene-maleic anhydride copolymer.

8. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The compatibilizer is any one of SMA-700, SMA-725, and SMA-800.

9. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The organosilicon toughening agent contains 5-80% organosilicon.

10. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The organosilicon toughening agent is selected from Mitsubishi Rayon SRK-200A or Kanekachi MR502.

11. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The anchoring group is selected from -R2N and -R3N. + -COOH, -SO3H, -SO 2- -PO4 2- One or at least two of them.

12. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The solvation chain is selected from one or at least two of polyester, polyether, polyolefin or polyacrylate.

13. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The superdispersant is selected from Lubrizol DP-310 or Fenmei R1800-S.

14. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The antioxidant is a mixture of phosphate ester antioxidants and hindered phenolic antioxidants in a mass ratio of 3 to 1:

1.

15. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The scratch-resistant dispersing lubricant is selected from Degussa Tegomer V-Si 4042 or E525.

16. The multifunctional, scratch-resistant, and chemical-resistant paint-free PMMA / ASA composition according to claim 1, characterized in that, The light stabilizer is selected from any one of UV-P, UV-770, UV-234, and UV-360.

17. A method for preparing a multifunctional, scratch-resistant, and chemical-resistant, paint-free PMMA / ASA composition according to any one of claims 1-16, characterized in that, Includes the following steps: S1. Add the superdispersant and aluminum powder to the mixer and stir to disperse evenly, as component (I). S2. Add ASA adhesive powder, SAN resin and compatibilizer into a mixer and stir evenly. Then add PMMA resin and silicone toughening agent and stir evenly. Finally, add component (I) and antioxidant, scratch-resistant dispersing lubricant and light stabilizer and stir evenly to form component (II). S3. Component (II) is fed into a twin-screw extruder and subjected to extrusion granulation, traction stripping, water cooling, dehydration, and pelletizing to produce a multifunctional, scratch-resistant, weather-resistant, and chemical-resistant paint-free PMMA / ASA composition.

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