Composite material and its preparation method

Abstract

The present application discloses a composite material and a preparation method thereof, belonging to the technical field of resins. In the composite material provided by the present application, AES is introduced as a co-toughening agent for ASA. By using the ethylene-propylene rubber in the molecular structure of AES, micro-crosslinking of AES and ASA is achieved through a crosslinking agent. The toughening agent after micro-crosslinking can improve the heat resistance of the entire system while ensuring toughness. Among them, the Vicat softening temperature of the composite material can reach 105 °C, which can meet the usage requirements of automotive exterior parts.

Description

Technical Field

[0001] This application relates to the technical field of resins, and particularly relates to a composite material and a preparation method thereof. Background Art

[0002] PMMA (Polymeric Methyl Methacrylate) is a material with extremely excellent light resistance and can meet the light requirements of vehicle body exterior trim. It is applied to the vehicle body exterior trim, such as automotive exterior lights. However, the PMMA material itself is very brittle and has low impact strength, so it cannot be applied to scenarios where there is force or collision tests. Currently, the mainstream method is to compound PMMA with ASA (acrylonitrile-styrene-acrylate copolymer). By adding ASA to PMMA, the toughness of PMMA is improved to expand its scope of use. However, the heat resistance of the ASA material is significantly lower than that of the PMMA material. After adding the ASA material to the PMMA material, the Vicat softening point of the PMMA material will be reduced, resulting in poor heat resistance of the PMMA / ASA composite material and making it unable to be applied to high-temperature scenarios. Summary of the Invention

[0003] The embodiments of this application provide a composite material and a preparation method thereof, which can improve the heat resistance of the composite material. The technical solution is as follows:

[0004] On the one hand, a composite material is provided. The composite material includes the following components in parts by weight:

[0005] 50 - 90 parts of polymethyl methacrylate (PMMA), 10 - 40 parts of acrylonitrile-styrene-acrylate copolymer (ASA), 5 - 20 parts of ethylene-propylene-styrene-acrylonitrile copolymer (AES), 0.1 - 3 parts of crosslinking agent, 0.1 - 1 part of heat stabilizer, 1 - 10 parts of compatibilizer, 0.1 - 3 parts of light stabilizer.

[0006] In a possible implementation, the mass fraction of ethylene-propylene rubber in the AES is 20% - 50%.

[0007] In another possible implementation, the melt index of the PMMA is 0.5 - 20 g / min.

[0008] In another possible implementation, the mass fraction of acrylate rubber in the ASA is 20% - 60%.

[0009] In another possible implementation, the crosslinking agent includes at least one of cumene hydroperoxide, hydrogen peroxide, potassium peroxide, and sodium peroxide.

[0010] In another possible implementation, the compatibilizer is a binary copolymer of any two components among acrylonitrile, styrene, and maleic anhydride; or a terpolymer of acrylonitrile, styrene, and maleic anhydride.

[0011] In another possible implementation, the mass fraction of maleic anhydride in the terpolymer or the binary copolymer containing maleic anhydride is 15% - 50%.

[0012] In another possible implementation, the heat stabilizer includes at least one of hindered phenol heat stabilizers and hypophosphite heat stabilizers.

[0013] In another possible implementation, the light stabilizer includes at least one of hindered amine light stabilizers and ultraviolet absorbers.

[0014] On the other hand, a method for preparing a composite material is provided, and the preparation method includes:

[0015] According to the weight parts of each component, first mix the AES and the ASA evenly, and then add the crosslinking agent and 0.05 - 0.4 parts of the heat stabilizer and continue to mix evenly to obtain a first mixed material;

[0016] Add the first mixed material into a twin-screw extruder, and the extrusion temperature is in the range of 190 - 230 °C to obtain a mixture;

[0017] Mix the mixture with the PMMA, the compatibilizer, the light stabilizer, and 0.05 - 0.6 parts of the heat stabilizer evenly to obtain a second mixed material;

[0018] Add the second mixed material into the twin-screw extruder, and the extrusion temperature is in the range of 190 - 250 °C to obtain the composite material.

[0019] The embodiment of the present application provides a composite material. In this composite material, AES is introduced as a co-toughening agent for ASA. By using the ethylene-propylene rubber in the AES molecular structure, micro-crosslinking of AES and ASA is achieved through a crosslinking agent. The toughening agent after micro-crosslinking can improve the heat resistance of the entire system while ensuring toughness. Among them, the Vicat softening temperature of this composite material can reach 105 °C, which can meet the usage requirements of automotive exterior parts.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present disclosure. Specific Embodiments

[0021] To make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below.

[0022] On the one hand, an embodiment of the present application provides a composite material, which comprises the following components in parts by weight:

[0023] 50 - 90 parts of PMMA, 10 - 40 parts of ASA, 5 - 20 parts of AES (ethylene - propylene - styrene - acrylonitrile), 0.1 - 3 parts of cross - linker, 0.1 - 1 part of heat stabilizer, 1 - 10 parts of compatibilizer, 0.1 - 3 parts of light stabilizer.

[0024] Among them, the parts by weight of PMMA can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts. Specifically, the parts by weight of PMMA can be 55 - 75 parts.

[0025] The parts by weight of ASA can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts. Specifically, the parts by weight of ASA can be 20 - 30 parts.

[0026] The parts by weight of AES can be 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts. Specifically, the parts by weight of AES can be 6 - 15 parts.

[0027] The parts by weight of the cross - linker can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part, 1.5 parts, 1.8 parts, 2 parts, 2.5 parts, 3 parts. Specifically, the parts by weight of the cross - linker can be 0.3 - 0.8 parts.

[0028] The parts by weight of the heat stabilizer can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part. Specifically, the parts by weight of the heat stabilizer can be 0.1 - 0.5 parts.

[0029] The parts by weight of the compatibilizer can be 1 part, 2 part, 3 part, 4 part, 5 part, 6 part, 7 part, 8 part, 9 part, 10 part. Specifically, the parts by weight of the compatibilizer can be 3 - 5 parts.

[0030] The parts by weight of the light stabilizer can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part, 1.5 parts, 1.8 parts, 2 parts, 2.5 parts, 3 parts. Specifically, the parts by weight of the light stabilizer can be 0.5 - 1 part.

[0031] The embodiment of the present application provides a composite material. In this composite material, AES is introduced as a co - toughening agent for ASA. By using the ethylene - propylene rubber in the AES molecular structure, micro - crosslinking of AES and ASA is achieved through a crosslinking agent. The toughening agent after micro - crosslinking can improve the heat - resistance performance of the whole system while ensuring toughness. Among them, the Vicat softening temperature (50 N, heating rate of 50℃ / min) of this composite material can reach 105℃ or even 106℃, which can meet the usage requirements of automotive exterior parts.

[0032] In a possible implementation, the mass fraction of ethylene - propylene rubber in AES is 20% - 50%.

[0033] Among them, the mass fraction of ethylene - propylene rubber in AES can be 20%, 25%, 30%, 35%, 40%, 45%, 50%. Specifically, the mass fraction of ethylene - propylene rubber in AES can be 30% - 40%.

[0034] In a possible implementation, the melt index of PMMA is 0.5 - 20 g / min (test conditions: 230℃, 3.5 kg).

[0035] Among them, the melt index of PMMA can be 0.5 g / min, 1 g / min, 2 g / min, 3 g / min, 5 g / min, 8 g / min, 10 g / min, 12 g / min, 15 g / min, 18 g / min, 20 g / min. Specifically, the melt index of PMMA can be 2 - 10 g / min.

[0036] In a possible implementation, the mass fraction of acrylate rubber in ASA is 20% - 60%.

[0037] Among them, the mass fraction of acrylate rubber in ASA can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%. Specifically, the mass fraction of acrylate rubber in ASA can be 40% - 60%.

[0038] In a possible implementation, the crosslinking agent is mainly peroxide, including at least one of cumene hydroperoxide, hydrogen peroxide, potassium peroxide, and sodium peroxide.

[0039] In the embodiment of the present application, micro - crosslinking of AES and ASA is achieved through a crosslinking agent. By using the toughening agent after micro - crosslinking, the problem of the decrease in the heat - resistance performance of the material caused by the addition of ASA is improved.

[0040] In a possible implementation, the compatibilizer is a binary copolymer of any two components among acrylonitrile, styrene, and maleic anhydride; or a terpolymer of acrylonitrile, styrene, and maleic anhydride.

[0041] In this implementation, if the compatibilizer is a binary copolymer, the compatibilizer can be a binary copolymer of acrylonitrile and styrene, a binary copolymer of acrylonitrile and maleic anhydride, or a binary copolymer of styrene and maleic anhydride.

[0042] Among them, the mass fraction of maleic anhydride in the terpolymer or the binary copolymer containing maleic anhydride is 15% - 50%. For example, the mass fraction of maleic anhydride can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%. Specifically, the mass fraction of maleic anhydride can be 20% - 30%.

[0043] In the embodiments of the present application, the above-mentioned compatibilizer can improve the compatibility between PMMA, AES and ASA, and enhance the overall performance of the PMMA / ASA / AES composite material.

[0044] In a possible implementation, the heat stabilizer includes at least one of hindered phenol heat stabilizers and hypophosphite heat stabilizers.

[0045] In this implementation, the heat stabilizer can include at least one of BASF 1010, BASF 1076, BASF 168, BASF 626 and BASF 627.

[0046] In the embodiments of the present application, the above-mentioned heat stabilizer can significantly prevent the aging of the composite material and extend its service life.

[0047] In a possible implementation, the light stabilizer includes at least one of hindered amine light stabilizers and ultraviolet absorbers.

[0048] In this implementation, the light stabilizer can include at least one of BASF 770, BASF 944, BASF 234, and BASF UV-P.

[0049] In the embodiments of the present application, the above-mentioned light stabilizer can slow down the possibility of chemical reactions of the PMMA / ASA / AES composite material and prevent or delay the process of photoaging.

[0050] On the other hand, the embodiments of the present application provide a method for preparing a composite material, and the preparation method includes:

[0051] Step 101: According to the weight parts of each component, first mix AES and ASA evenly, then add a crosslinking agent and 0.05 - 0.4 parts of a heat stabilizer and continue to mix evenly to obtain a first mixed material.

[0052] The weight amounts of the heat stabilizer added in step 101 can be 0.05 parts, 0.1 parts, 0.12 parts, 0.15 parts, 0.18 parts, 0.2 parts, 0.22 parts, 0.25 parts, 0.26 parts, 0.3 parts, 0.35 parts, or 0.4 parts.

[0053] In step 101, AES and ASA are first mixed uniformly for 2 to 3 minutes, and then a cross-linking agent and a heat stabilizer are added and mixed uniformly for 5 to 10 minutes, thereby obtaining a first mixed material.

[0054] The mixing time of AES and ASA can be 2 min, 2.5 min, or 3 min, and there is no specific limit thereto. The mixing time after adding the heat stabilizer and cross-linking agent can be 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min, and there is no specific limit thereto.

[0055] Step 102: Add the first mixed material into a twin-screw extruder at an extrusion temperature within a range of 190-230° C. to obtain a mixture.

[0056] The first mixed material is added into a twin-screw extruder for a slight cross-linking reaction to obtain a slight cross-linked ASA / AES mixture.

[0057] The extrusion temperature can be controlled in nine stages, with each stage being 5°C.

[0058] Step 103: uniformly mixing the mixture with PMMA, a compatibilizer, a light stabilizer, and 0.05 to 0.6 parts of a heat stabilizer to obtain a second mixed material.

[0059] The mass fraction of the heat stabilizer added in step 103 can be 0.05 part, 0.1 part, 0.15 part, 0.18 part, 0.2 part, 0.22 part, 0.25 part, 0.3 part, 0.32 part, 0.34 part, 0.4 part, 0.45 part, 0.5 part, 0.55 part, or 0.6 part.

[0060] The mixing time in step 103 can be set and changed as needed, and is not specifically limited thereto. For example, the mixing time can be 10 min, 12 min, or 15 min.

[0061] Step 104: Add the second mixed material into a twin-screw extruder at an extrusion temperature within a range of 190-250° C. to obtain a composite material.

[0062] The second mixed material is added into a twin-screw extruder for blending to obtain a PMMA / ASA / AES composite material.

[0063] Among them, the extrusion temperature in step 104 can also be controlled in nine segments, with a 5°C interval for the first 5 segments and a 10°C interval for the last 4 segments.

[0064] In the embodiments of the present application, by controlling the content of peroxide, extrusion temperature, screw combination, etc., the particle size of the micro-crosslinked product can be controlled below 5 μm, and 90% of the micro-crosslinked product has a particle size below 1 μm.

[0065] The technical solutions of the present application will be described in detail below through specific embodiments.

[0066] In the following specific embodiments, operations not specified in terms of conditions are carried out according to conventional conditions or conditions recommended by the manufacturer.

[0067] Among them, the crosslinking agent in Examples 1 to 6 and Comparative Examples 1 to 4 is cumene hydroperoxide;

[0068] The compatibilizer in Examples 1 to 3 and Comparative Examples 2 to 3 is a binary copolymer of acrylonitrile and maleic anhydride, where the mass fraction of acrylonitrile is 75% and the mass fraction of maleic anhydride is 25%. The compatibilizer in Examples 4 to 6 and Comparative Examples 1 and 4 is a terpolymer of acrylonitrile, styrene and maleic anhydride, where the mass fraction of acrylonitrile is 55%, the mass fraction of styrene is 20%, and the mass fraction of maleic anhydride is 25%;

[0069] The heat stabilizer in Examples 1 to 6 and Comparative Examples 1 to 4 is a mixture of BASF 1010, BASF 168 and BASF 626, where the mass fraction of BASF 1010 is 80%, the mass fraction of BASF 168 is 10%, and the mass fraction of BASF 626 is 10%;

[0070] The light stabilizer in Examples 1 to 6 and Comparative Examples 1 to 4 is a mixture of BASF 770, BASF 944, BASF 234 and BASF UV-P, where the mass fraction of BASF 770 is 40%, the mass fraction of BASF 944 is 30%, the mass fraction of BASF 234 is 20%, and the mass fraction of BASF UV-P is 10%.

[0071] Example 1

[0072] Example 1 provides a PMMA / ASA / AES composite material, which is obtained by the following preparation method:

[0073] (1) First, 10 parts of AES and 20 parts of ASA are mixed evenly for 3 min, then 0.1 part of heat stabilizer and 0.3 part of crosslinking agent are added and mixed evenly for 10 min to obtain a first mixed material.

[0074] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0075] (3) Mix the mixture evenly with 70 parts of PMMA, 3 parts of compatibilizer, 0.1 part of heat stabilizer, and 0.5 part of light stabilizer to obtain a second mixed material.

[0076] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 250 °C to obtain a composite material.

[0077] The specific composition of Example 1 can also be seen in Table 1. Correspondingly, the specific compositions of subsequent Examples 2 - 6 and Comparative Examples 1 - 4 can also be seen in Table 1.

[0078] Table 1

[0079]

[0080] Example 2

[0081] Example 2 provides a PMMA / ASA / AES composite material, which is obtained through the following preparation method:

[0082] (1) First, mix 15 parts of AES and 15 parts of ASA evenly for 3 min, then add 0.1 part of heat stabilizer and 0.5 part of crosslinking agent and continue to mix evenly for 10 min to obtain a first mixed material.

[0083] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0084] (3) Mix the mixture evenly with 70 parts of PMMA, 3 parts of compatibilizer, 0.1 part of heat stabilizer, and 0.5 part of light stabilizer to obtain a second mixed material.

[0085] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 250 °C to obtain a composite material.

[0086] Example 3

[0087] Example 3 provides a PMMA / ASA / AES composite material, which is obtained through the following preparation method:

[0088] (1) First, mix 10 parts of AES and 20 parts of ASA evenly for 3 min, then add 0.12 part of heat stabilizer and 0.6 part of crosslinking agent and continue to mix evenly for 10 min to obtain a first mixed material.

[0089] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0090] (3) Mix the mixture evenly with 70 parts of PMMA, 3 parts of compatibilizer, 0.18 part of heat stabilizer, and 0.5 part of light stabilizer to obtain a second mixed material.

[0091] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 250 °C to obtain a composite material.

[0092] Example 4

[0093] Example 4 provides a PMMA / ASA / AES composite material, which is obtained through the following preparation method:

[0094] (1) First, mix 15 parts of AES and 20 parts of ASA evenly for 3 min, then add 0.18 part of heat stabilizer and 0.6 part of crosslinking agent and continue to mix evenly for 10 min to obtain a first mixed material.

[0095] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0096] (3) Mix the mixture evenly with 65 parts of PMMA, 5 parts of compatibilizer, 0.22 part of heat stabilizer, and 0.5 part of light stabilizer to obtain a second mixed material.

[0097] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 250 °C to obtain a composite material.

[0098] Example 5

[0099] Example 5 provides a PMMA / ASA / AES composite material, which is obtained through the following preparation method:

[0100] (1) First, mix 10 parts of AES and 25 parts of ASA evenly for 3 min, then add 0.22 part of heat stabilizer and 0.8 part of crosslinking agent and continue to mix evenly for 10 min to obtain a first mixed material.

[0101] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0102] (3) Mix the mixture evenly with 65 parts of PMMA, 5 parts of compatibilizer, 0.28 part of heat stabilizer, and 0.5 part of light stabilizer to obtain a second mixed material.

[0103] (4) Add the second mixed material into a twin-screw extruder, with the extrusion temperature being 190 - 250 °C, to obtain a composite material.

[0104] Example 6

[0105] Example 6 provides a PMMA / ASA / AES composite material, which is obtained through the following preparation method:

[0106] (1) First, uniformly mix 20 parts of AES and 15 parts of ASA for 3 minutes, then add 0.12 part of heat stabilizer and 0.8 part of cross-linking agent and continue to mix uniformly for 10 minutes to obtain a first mixed material.

[0107] (2) Add the first mixed material into a twin-screw extruder, with the extrusion temperature being 190 - 230 °C, to obtain a mixture.

[0108] (3) Uniformly mix the mixture with 65 parts of PMMA, 5 parts of compatibilizer, 0.18 part of heat stabilizer and 0.5 part of light stabilizer to obtain a second mixed material.

[0109] (4) Add the second mixed material into a twin-screw extruder, with the extrusion temperature being 190 - 250 °C, to obtain a composite material.

[0110] Comparative Example 1

[0111] Comparative Example 1 provides a PMMA / ASA / AES composite material, which is obtained through the following preparation method:

[0112] (1) First, uniformly mix 20 parts of AES and 5 parts of ASA for 3 minutes, then add 0.26 part of heat stabilizer and 1.0 part of cross-linking agent and continue to mix uniformly for 10 minutes to obtain a first mixed material.

[0113] (2) Add the first mixed material into a twin-screw extruder, with the extrusion temperature being 190 - 230 °C, to obtain a mixture.

[0114] (3) Uniformly mix the mixture with 75 parts of PMMA, 5 parts of compatibilizer, 0.34 part of heat stabilizer and 0.5 part of light stabilizer to obtain a second mixed material.

[0115] (4) Add the second mixed material into a twin-screw extruder, with the extrusion temperature being 190 - 250 °C, to obtain a composite material.

[0116] Comparative Example 2

[0117] Comparative Example 2 provides a PMMA / ASA composite material, which is obtained through the following preparation method:

[0118] (1) Mix 30 parts of ASA, 0.1 part of heat stabilizer and 0.3 part of crosslinking agent evenly for 10 min to obtain the first mixed material.

[0119] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0120] (3) Mix the mixture evenly with 70 parts of PMMA, 3 parts of compatibilizer, 0.1 part of heat stabilizer and 0.5 part of light stabilizer to obtain the second mixed material.

[0121] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 250 °C to obtain a composite material.

[0122] Comparative Example 3

[0123] Comparative Example 3 provides a PMMA / ASA / AES composite material, which is obtained by the following preparation method:

[0124] (1) Mix 26 parts of ASA and 4 parts of AES evenly for 3 min, then add 0.1 part of heat stabilizer and 0.3 part of crosslinking agent and continue to mix evenly for 10 min to obtain the first mixed material.

[0125] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0126] (3) Mix the mixture evenly with 70 parts of PMMA, 3 parts of compatibilizer, 0.1 part of heat stabilizer and 0.5 part of light stabilizer to obtain the second mixed material.

[0127] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 250 °C to obtain a composite material.

[0128] Comparative Example 4

[0129] Comparative Example 4 provides a PMMA / ASA / AES composite material, which is obtained by the following preparation method:

[0130] (1) Mix 5 parts of ASA and 25 parts of AES evenly for 3 min, then add 0.26 part of heat stabilizer and 1.0 part of crosslinking agent and continue to mix evenly for 10 min to obtain the first mixed material.

[0131] (2) Add the first mixed material into a twin-screw extruder, and the extrusion temperature is 190 - 230 °C to obtain a mixture.

[0132] (3) Mix the mixture evenly with 70 parts of PMMA, 5 parts of compatibilizer, 0.34 parts of heat stabilizer, and 0.5 parts of light stabilizer to obtain a second mixed material.

[0133] (4) Add the second mixed material into a twin-screw extruder, and the extrusion temperature is 190~250 °C to obtain a composite material.

[0134] Application Examples

[0135] This application tested the composite materials prepared in Examples 1~6 and Comparative Examples 1~4. The test results are shown in Table 2.

[0136] Table 2

[0137]

[0138] Among them, the test method for the notched Izod impact of a simply supported beam is carried out in accordance with ISO 179-1 / 1 eA, and the test method for the Vicat softening temperature is carried out in accordance with ISO 306 / B 50.

[0139] It can be seen from Table 2 that the notched Izod impact strength and Vicat softening temperature of the composite materials prepared in Examples 1~6 are significantly better than those of Comparative Example 2. In particular, the Vicat softening temperature of the composite material prepared in Example 2 is as high as 106 °C. This is because an appropriate amount of AES is added to the composite materials prepared in Examples 1~6, and the ethylene-propylene rubber in AES is micro-crosslinked with ASA, thereby improving the heat resistance of the overall system while ensuring the toughness of the material.

[0140] Although AES is also added in Comparative Example 3, the addition amount of AES is small. Therefore, the notched Izod impact strength and Vicat softening temperature of the composite material prepared in Comparative Example 3 are low. Although the composite materials prepared in Comparative Examples 1 and 4 also have high notched Izod impact strength and Vicat softening temperature, the addition amount of ASA in Comparative Example 1 is small, and the addition amount of AES in Comparative Example 4 is large, both of which result in the appearance of the product not meeting the requirements. Thus, it can be seen that the weight parts of ASA and the weight parts of AES have an important influence on the appearance and performance of the product.

[0141] The above description is only for the convenience of those skilled in the art to understand the technical solution of this application, and does not limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A composite material, characterized in that, The composite material comprises the following components in parts by weight: 50 - 90 parts of polymethyl methacrylate (PMMA), 10 - 40 parts of acrylonitrile - styrene - acrylate copolymer (ASA), 5 - 20 parts of ethylene - propylene - styrene - acrylonitrile copolymer (AES), 0.1 - 3 parts of cross - linker, 0.1 - 1 part of heat stabilizer, 1 - 10 parts of compatibilizer, 0.1 - 3 parts of light stabilizer; The cross - linker includes at least one of cumene hydroperoxide, hydrogen peroxide, potassium peroxide, and sodium peroxide; The preparation method of the composite material comprises: According to the parts by weight of each component, first mix the AES and the ASA evenly, then add the cross - linker and 0.05 - 0.4 part of the heat stabilizer and continue to mix evenly to obtain a first mixed material; Add the first mixed material into a twin - screw extruder, and the extrusion temperature is in the range of 190 - 230 °C to obtain a mixture; Mix the mixture evenly with the PMMA, the compatibilizer, the light stabilizer, and 0.05 - 0.6 part of the heat stabilizer to obtain a second mixed material; Add the second mixed material into the twin - screw extruder, and the extrusion temperature is in the range of 190 - 250 °C to obtain the composite material.

2. The composite material according to claim 1, wherein The mass fraction of ethylene - propylene rubber in the AES is 20% - 50%.

3. The composite material according to claim 1, wherein The melt index of the PMMA at 230 °C and 3.5 kg is 0.5 - 20 g / min.

4. The composite material according to claim 1, characterized in that, The mass fraction of acrylate rubber in the ASA is 20% - 60%.

5. The composite material according to claim 1, wherein The compatibilizer is a binary copolymer of any two components among acrylonitrile, styrene, and maleic anhydride; or a terpolymer of acrylonitrile, styrene, and maleic anhydride.

6. The composite material according to claim 5, wherein The mass fraction of maleic anhydride in the terpolymer or the binary copolymer containing maleic anhydride is 15% - 50%.

7. The composite material according to claim 1, characterized in that The heat stabilizer includes at least one of hindered phenol heat stabilizers and hypophosphite heat stabilizers.

8. The composite material according to claim 1, wherein The light stabilizer includes at least one of hindered amine light stabilizers and ultraviolet absorbers.

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