Matt flame-retardant pc / asa alloy material and preparation method thereof

Abstract

The application discloses a kind of matt flame-retardant PC / ASA alloy materials, including PC resin, ASA resin, active matting agent, phosphate ester flame retardant and phosphorus-silicon flame-retardant synergist;The phosphorus-silicon flame-retardant synergist is prepared by phosphorus-silicon preform and nano active polysiloxane, and the phosphorus-silicon preform is obtained by the reaction of phosphosilic acid, methylcyclosiloxane, silicate and crosslinking agent.The application introduces PC / ASA alloy material by compounding phosphorus-silicon flame-retardant synergist and phosphate ester flame retardant, which can greatly improve the flame retardancy of PC / ASA alloy material, more unexpectedly, after adding a small amount in PC / ASA alloy material, it can migrate to the surface of the material, produce diffuse reflection to light, reduce the surface gloss of the material, and make the material maintain high elongation at break and impact strength.The obtained PC / ASA alloy material has excellent matt, flame retardancy and mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high polymer materials, and particularly relates to a matte flame-retardant PC / ASA alloy material and a preparation method thereof. BACKGROUND

[0002] Polycarbonate (PC) is a kind of thermoplastic resin with excellent comprehensive performance, and has the advantages of high transparency, high gloss, high heat resistance, rigidity and impact toughness, etc. However, it also has the disadvantages of poor flowability, difficult molding, easy stress cracking and poor solvent resistance. Acrylonitrile-styrene-acrylate terpolymer (ASA) has excellent impact strength, good processing performance, good weather resistance and solvent resistance, high gloss and excellent comprehensive performance. PC / ASA alloy combines the advantages of the two resins, and has complementary performance, and is widely used in automotive interiors and exteriors, indoor office, outdoor electronic equipment, etc.

[0003] However, PC / ASA alloy with high gloss is easy to cause dizziness, fatigue and harm to people's eyesight. In various application occasions, the appearance of products made of the material is often required to be matte. Traditional matte process is to spray matte paint or to scribe lines on the surface of a mold. The spray matte paint process is complex and high in cost, and pollutes the environment. The scribe lines on the surface of the mold process has unsatisfactory surface matte effect, uneven matte effect, and the surface lines are easy to wear and need regular maintenance, which is also high in cost. Meanwhile, in order to meet the wide application of the material in outdoor energy storage, automobiles, home appliances and electronic and electrical fields, the PC / ASA alloy should have very good flame retardant performance.

[0004] At present, most of the matt technology on the market is to add inorganic matt agent talc, organic matt agent BMAT (cross-linked AS) and other components to extrude and granulate to obtain matt alloy material, but the compatibility of these matt agents with the alloy is not good, which has a great influence on the elongation at break and impact strength of the material, and the plastic parts made of such material have the risk of cracking during use. Patent CN109337327A discloses a weather-resistant matt PC / ASA alloy material, which comprises the following components in parts by weight: bisphenol A polycarbonate resin 69-75 parts, acrylate rubber-acrylonitrile-styrene graft copolymer 14-20 parts, silicone toughening agent 3-7 parts, compatibilizer 2-4 parts, matt agent 4 parts, hindered phenolic antioxidant 0.2 parts, auxiliary antioxidant 0.2 parts, ultraviolet absorber 0.3 parts and lubricant 0.2 parts. The active matt agent is added in the PC / ASA alloy material, and the matt agent is preferably cross-linked styrene-acrylonitrile copolymer (BMAT), so as to realize the matt effect; but the 60° gloss of the light color plate is only 27.5, the tensile strength is only 45.6 MPa, the bending strength is only 66.8 MPa, and the material does not have flame retardant performance; neither the matt performance nor the mechanical properties and flame retardant performance can meet the wide application of the material in outdoor energy storage, automobile, household appliance and electronic and electrical field, so it is urgent to develop a good toughness and flame retardant matt flame retardant PC / ASA alloy material. SUMMARY

[0005] Based on this, the present application provides a kind of matt flame retardant PC / ASA alloy material, with phosphorus-silicon flame retardant synergist and phosphate flame retardant compound, can greatly improve the flame retardancy of PC / ASA alloy material, while phosphorus-silicon flame retardant synergist will partially migrate to the surface of material, its special shape produces diffuse reflection to light, reduce the surface gloss of material, realize matt effect, and make PC / ASA alloy material have higher mechanical properties.

[0006] The first aspect of the present application is to provide a kind of matt flame retardant PC / ASA alloy material, including PC resin, ASA resin, active matt agent, phosphate flame retardant and phosphorus-silicon flame retardant synergist;

[0007] The phosphorus-silicon flame retardant synergist is prepared from phosphorus-silicon preform and nano active polysiloxane, and the phosphorus-silicon preform is obtained by reacting silicon phosphate, methylcyclosiloxane, silicate and crosslinking agent.

[0008] In some embodiments, the silicon content in the phosphorus-silicon flame retardant synergist is 45-75%, and the phosphorus content is 5-15%. Preferably, the silicon content in the phosphorus-silicon flame retardant synergist is 60-65%, and the phosphorus content is 6-8%.

[0009] In some embodiments, the PC resin is a medium-viscosity polycarbonate resin with a melt index of 10–22 g / 10 min; and / or,

[0010] The ASA resin is an acrylonitrile-styrene-acrylate rubber with an acrylate rubber content of 35-40%; and / or,

[0011] The active matting agent is a highly cross-linked AS (styrene-acrylonitrile copolymer) copolymer GMA (glycidyl methacrylate) functional polymer; and / or,

[0012] The phosphate flame retardant is one or more combinations of bisphenol A-bis(diphenyl phosphate) (BDP), resorcinol bis(diphenyl phosphate) (RDP), and hexaphenoxycyclotriphosphazene, preferably bisphenol A-bis(diphenyl phosphate); and / or,

[0013] The methylcyclosiloxane is octamethylcyclotetrasiloxane; and / or,

[0014] The silicate is montmorillonite; and / or,

[0015] The crosslinking agent is an aminosilane coupling agent.

[0016] In some embodiments, the mass ratio of the PC resin, ASA resin, reactive matting agent, phosphate ester flame retardant, and phosphosilicone flame retardant synergist is (59-81):(5-15):(2-4):(8-12):(2-4), preferably (62-73):(5-15):(3-4):10:(3-4); and / or,

[0017] The mass ratio of the phosphorus-silicon preform to the nano-active polysiloxane is 100:(0.8-1.2); and / or,

[0018] The mass ratio of the silicon phosphate, methylcyclosiloxane, silicate, and crosslinking agent is 1:(2.5-3.5).

[0019] (2-4): (0.4-0.6).

[0020] In some embodiments, the preparation method of the phosphorus-silicon flame retardant synergist includes the following steps:

[0021] (1) The phosphate silicon, methylcyclosiloxane, silicate and crosslinking agent are stirred and reacted for 3 to 4 hours under the conditions of pH 7-8 and temperature 50℃~80℃ to obtain block phosphate silicon preform;

[0022] (2) The phosphorus silicon preform is dried, pulverized and sieved to obtain phosphorus silicon preform powder, and then fully mixed with the nano-active polysiloxane to obtain the phosphorus silicon flame retardant synergist.

[0023] In some embodiments, the following components are included by weight percentage:

[0024]

[0025]

[0026] In some embodiments, the following components are included by weight percentage:

[0027]

[0028] In some embodiments, the following components are included by weight percentage:

[0029]

[0030] In some embodiments, the toughening agent is one or more combinations of methyl methacrylate-butadiene-styrene graft copolymer, methyl methacrylate-silicone-acrylate copolymer, acrylonitrile-styrene-silicone-acrylate copolymer, and acrylate-grafted all-silicone copolymer, and the toughening agent has a core-shell structure; and / or,

[0031] The anti-dripping agent is one or more combinations of polytetrafluoroethylene micropowder and polytetrafluoroethylene coated with acrylonitrile-styrene copolymer; and / or,

[0032] The antioxidant is one or more combinations of Irganox 1010, Irganox 1076, and Irganox 168. Preferably, the antioxidant is a mixture of Irganox 1076 and Irganox 168 in a mass ratio of 1:(3-5); and / or,

[0033] The lubricating dispersant is one or more combinations of pentaerythritol phosphate, silicone powder, and montan wax.

[0034] A second aspect of the present invention is to provide a method for preparing a matte flame-retardant PC / ASA alloy material, comprising the following steps:

[0035] 1) Mix PC resin, ASA resin, toughening agent, active matting agent, phosphate flame retardant, phosphorus silicon flame retardant synergist, anti-dripping agent, antioxidant and lubricating dispersant evenly to obtain a premix;

[0036] 2) The premixed material obtained in step 1) is added into the twin-screw extruder through the main feed port, and then melt-mixed, extruded and granulated in the twin-screw extruder to obtain the matte flame-retardant PC / ASA alloy material.

[0037] In some embodiments, starting from the self-feeding port, the processing temperatures of each zone of the twin-screw extruder are set as follows: 210±5℃, 240±5℃, 245±35℃, 250±5℃, 250±5℃, 250±5℃, 245±5℃, 250±5℃, respectively; the die temperature is set to 250±5℃; the screw speed is 400~500rad / min; and the vacuum degree is -0.5~-1Mpa.

[0038] In existing technologies, a matte finish is typically achieved by adding common matting agents to PC / ASA alloy materials. However, these common matting agents have poor compatibility with PC / ASA alloy materials, significantly impacting the material's elongation at break and impact strength. Components made from such materials are at risk of cracking during use. To address this problem, this invention employs a compound of a phosphorus-silicon flame retardant synergist and a phosphate ester flame retardant, introduced into the PC / ASA alloy material. This not only significantly improves the flame retardancy of the PC / ASA alloy material, but also, unexpectedly, allows it to migrate to the material surface after being added in small amounts. This causes diffuse reflection of light, reducing the surface gloss while maintaining high elongation at break and impact strength. The resulting PC / ASA alloy material thus possesses excellent matte finish, flame retardancy, and mechanical properties.

[0039] Furthermore, the active matting agent of the present invention contains GMA (glycidyl methacrylate), and the active epoxy functional groups in GMA can crosslink with the terminal hydroxyl and terminal carboxyl groups of PC resin, which improves the compatibility of the active matting agent with PC / ASA alloy without sacrificing the mechanical properties of the material. At the same time, this crosslinking reaction will reduce the surface gloss of PC / ASA alloy material to a certain extent.

[0040] Furthermore, this invention introduces phosphate ester flame retardants, phosphorus-silicon flame retardant synergists, and active matting agents into the PC resin and ASA resin system, and then combines them with specific amounts of toughening agents, anti-dripping agents, antioxidants, and lubricating dispersants to prepare a matte flame-retardant PC / ASA alloy material. The amount of ASA resin added is also increased to raise the rubber content of the system and reduce surface gloss. Through the synergistic effect of the components, the surface gloss of the material is significantly reduced, resulting in a PC / ASA alloy material with low surface gloss, good flame retardant effect, and excellent toughness, which can be used in outdoor charging piles, power banks, and energy storage power supplies. Detailed Implementation

[0041] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments are merely illustrative of the present invention and should not be construed as limiting the invention.

[0042] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0043] In this invention, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] The sources of each raw material in the embodiments of the present invention are as follows:

[0045] The selected PC resin is Covestro's PC 2400, with a melt index of 10-22 g / 10 min;

[0046] The selected ASA resin is LG's LI910-NP, with an acrylate rubber content of 40%.

[0047] The toughening agent selected is Mitsubishi's SX-006;

[0048] The active matting agent selected was Jia Yi Rong's XGM-003, which contains 3% GMA.

[0049] The selected phosphorus-based flame retardant is WSFR-BDP from Zhejiang Wansheng.

[0050] The selected phosphorus-silicon flame retardant synergist is the self-made FR380A;

[0051] The anti-dripping agent selected is SN3300B7 from Guangzhou Entropy Energy.

[0052] The antioxidant selected is BASF's B900;

[0053] The lubricant and dispersant used was ST-LS100 silicone powder from Starbeda.

[0054] The selected phosphorus-silicon flame retardant synergist (FR380A) was prepared in-house. The preparation process was based on the relevant description of phosphorus-silicon flame retardant synergist FR380A in patent CN116199938A, and the preparation method is as follows:

[0055] 1. 100 parts of silicon phosphate, 300 parts of octamethylcyclotetrasiloxane, 300 parts of layered silicate and 50 parts of crosslinking agent were reacted at a constant temperature for 3 hours under high-speed stirring in a reactor to obtain silicon phosphate preform (block form). The reaction temperature was 70℃ and the stirring rate was 400 rad / min.

[0056] 2. The obtained phosphosilicate preform is pulverized using a high-speed pulverizer and then sieved to obtain phosphosilicate preform powder of a certain particle size;

[0057] 3. The phosphorus silicon preform powder is mixed with nano-active polysiloxane synergist at high speed to obtain phosphorus silicon flame retardant synergist. The phosphorus silicon flame retardant synergist has a silicon content of 60-65% and a phosphorus content of 6-8%.

[0058] The following are specific examples.

[0059] Examples 1 to 6

[0060] The raw materials and weight percentages for the preparation of a matte flame-retardant PC / ASA alloy material according to Examples 1 to 6 are shown in Table 1.

[0061] Table 1

[0062]

[0063]

[0064] In the above embodiments, the preparation method of the matte flame-retardant PC / ASA alloy material includes the following steps:

[0065] 1) Mix PC resin, ASA resin, toughening agent, active matting agent, phosphate flame retardant, phosphorus silicon flame retardant synergist, anti-dripping agent, antioxidant and lubricating dispersant evenly to obtain a premix;

[0066] 2) The premixed material obtained in step 1) is added to a twin-screw extruder through the main feed port, where it is melt-mixed, extruded, and granulated. Starting from the main feed port, the processing temperatures of each zone of the twin-screw extruder are set as follows: 210℃, 240℃, 245℃, 250℃, 250℃, 250℃, 245℃, and 250℃, respectively. The die temperature is set to 250℃, and the temperature fluctuation range of each zone is controlled within 5℃. The screw speed is 450 rad / min, the vacuum degree is -0.6 MPa, and the extruded strip is water-cooled, air-cooled, pelletized, and dried to obtain the matte flame-retardant PC / ASA alloy material.

[0067] Comparative Examples 1 to 5

[0068] Table 2 shows the raw materials and weight percentages of a matte flame-retardant PC / ASA alloy material used in Comparative Examples 1 to 5.

[0069] Table 2

[0070]

[0071]

[0072] The preparation method of the matte flame-retardant PC / ASA alloy material in the above comparative examples includes the following steps:

[0073] 1) Mix the raw material components evenly according to the amounts specified in Table 2 above to obtain a premix;

[0074] 2) The premixed material obtained in step 1) is added to a twin-screw extruder through the main feed port, where it is melt-mixed, extruded, and granulated. Starting from the main feed port, the processing temperatures of each zone of the twin-screw extruder are set as follows: 210℃, 240℃, 245℃, 250℃, 250℃, 250℃, 245℃, and 250℃, respectively. The die temperature is set to 250℃, and the temperature fluctuation range of each zone is controlled within 5℃. The screw speed is 450 rad / min, the vacuum degree is -0.6 MPa, and the extruded strip is water-cooled, air-cooled, pelletized, and dried to obtain the matte flame-retardant PC / ASA alloy material.

[0075] Performance testing

[0076] After drying the matte flame-retardant PC / ASA alloy material samples prepared in Examples 1-6 and Comparative Examples 1-5 at 90°C for 3 hours, they were tested according to the following standard test methods:

[0077] The testing methods for each performance aspect are as follows:

[0078] Tensile strength was tested according to ASTM D638 standard, with a tensile rate of 50 mm / min;

[0079] Elongation at break was tested according to ASTM D638 standard, with a tensile rate of 50 mm / min.

[0080] Bending strength was tested according to ASTM D790 standard, with a bending rate of 2 mm / min;

[0081] The notched impact strength was tested according to ASTM D256 standard, with a pendulum weight of 2.75 J.

[0082] The melt flow index was tested according to ASTM D1238 standard, and the test conditions were 260℃ / 2.16kg;

[0083] Flame retardancy is tested according to UL94 standard, and the test strips are of various thicknesses;

[0084] The gloss was tested according to ISO 2813 standard. The 60° gloss was tested using a KOSAI MG 6-S1 multi-angle gloss meter and a gloss swatch.

[0085] The test results are shown in Tables 3 and 4.

[0086] Table 3 Performance test results of PC / ASA alloy materials in Examples 1-6

[0087]

[0088] Table 4. Performance test results of PC / ASA alloy materials in Comparative Examples 1–5

[0089]

[0090] Referring to Tables 3-4, it can be seen from Comparative Example 1 and Example 6 that the flame-retardant PC / ASA alloy material without the addition of active matting agent and phosphorus silicon flame retardant synergist has a high surface gloss, with a gloss of up to 103 at a 60° angle, and the flame retardant performance is reduced to 2.0mm UL94 V-0 level. As can be seen from Comparative Examples 2-3 and Example 6, the surface gloss of Comparative Example 2, which only added the active matting agent XGM-003, and Comparative Example 3, which only added the phosphorus-silicon flame retardant synergist, was significantly reduced. The 60° gloss of the glossy color plates decreased to 21 and 25, respectively. This is because the active matting agent is a highly crosslinked AS copolymer GMA. Highly crosslinked AS has a high relative molecular mass and a large molecular volume, which differs greatly from the relative molecular mass of other components in the alloy. It has poor compatibility with PC / ASA resin. After being added to the alloy system, its plasticizing effect is poor, which can lead to micro-roughening of the sample surface and thus matting. At the same time, the crosslinking reaction between the functional groups of GMA and the end groups of PC further reduces the surface gloss of the PC / ASA alloy and improves the compatibility between the active matting agent and the PC / ASA alloy, thereby improving the mechanical properties of the material. When the material is molded, the phosphorus-silicon flame retardant synergist is partially exposed on the material surface. Because the phosphorus-silicon flame retardant synergist has an irregular shape similar to heavy calcium carbonate, with angular particles and a rough surface, it diffuses light, thus reducing the material's gloss. As can be seen from Example 6, the active matting agent and the phosphorus-silicon flame retardant synergist have a synergistic effect in reducing surface gloss. When 4% of the active matting agent XGM-003 and 4% of the phosphorus-silicon flame retardant synergist are added respectively, the gloss of the material at a 60° angle on the glossy side drops to 9, with a particularly significant matte effect. Furthermore, the material exhibits good mechanical strength and flexibility.

[0091] Meanwhile, as can be seen from Comparative Examples 3-4 and Example 1, after replacing the active matting agent and phosphorus silicon flame retardant synergist with talc and BMAT as active matting agents, the flexibility of the material was severely reduced. Its elongation at break was only 32-36%, and its impact strength was only 346-452 J / m. This is mainly because talc and BMAT are rigid particles and have poor compatibility with PC / ASA alloys. They are prone to phase separation with PC / ASA resin, which leads to a decrease in the toughness of the material. Moreover, its matte effect is not as good as the matte flame retardant PC / ASA alloy material of the present invention.

[0092] As can be seen from Comparative Examples 2 and 5, both are cross-linked ASs. XGM-003 in Comparative Example 2 has GMA reactive functional groups. GMA undergoes cross-linking reaction with the terminal carboxyl and terminal hydroxyl groups of PC, which allows it to bond with the PC / ASA alloy, thereby maintaining a high level of mechanical properties of the material. However, BMAT in Comparative Example 5 does not have reactive functional groups, so its compatibility with the alloy material is poor, and it is prone to phase separation, which has a great impact on the mechanical properties of the material.

[0093] As shown in Examples 1-3, the gloss of the material decreases with increasing amounts of active matting agent and phosphosilicone flame retardant synergist. When the amount of phosphosilicone flame retardant synergist reaches 4%, the flame retardancy of the material reaches the UL94 V-0 level of 0.5mm, indicating that the phosphosilicone flame retardant synergist has a significant effect on improving the flame retardancy of the PC / ASA alloy. Examples 4-6 show that with increasing amounts of ASA resin, the gloss of the material at a 60° angle on the glossy side also decreases slightly. This is because the increased rubber content in the matte flame-retardant PC / ASA alloy material can reduce the gloss of the material to some extent.

[0094] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A matte flame-retardant PC / ASA alloy material, characterized in that, Including PC resin, ASA resin, reactive matting agent, flame retardant, and phosphosilicone flame retardant synergist; The phosphorus-silicon flame retardant synergist is prepared by phosphorus-silicon preform and nano-active polysiloxane. The phosphorus-silicon preform is obtained by reacting phosphoric acid silicon, methylcyclosiloxane, silicate and crosslinking agent. The silicon content in the phosphorus-silicon flame retardant synergist is 45-75%, and the phosphorus content is 5-15%. The active matting agent is a highly cross-linked AS copolymer GMA functional polymer; The flame retardant is one or more combinations of bisphenol A-bis(diphenyl phosphate), resorcinol bis(diphenyl phosphate), and hexaphenoxycyclotriphosphazene; The mass ratio of PC resin, ASA resin, active matting agent, flame retardant and phosphorus silicon flame retardant synergist is (59-81):(5-15):(2-4):(8-12):(2-4); The crosslinking agent is an aminosilane coupling agent.

2. The matte flame-retardant PC / ASA alloy material according to claim 1, characterized in that, The silicon content in the phosphorus-silicon flame retardant synergist is 60-65%, and the phosphorus content is 6-8%.

3. The matte flame-retardant PC / ASA alloy material according to claim 1, characterized in that, The PC resin is a medium-viscosity polycarbonate resin with a melt index of 10–22 g / 10 min; and / or, The ASA resin is an acrylonitrile-styrene-acrylate rubber, with an acrylate rubber content of 35-40%; and / or, The flame retardant is bisphenol A-bis(diphenyl phosphate); and / or, The methylcyclosiloxane is octamethylcyclotetrasiloxane; and / or, The silicate is montmorillonite.

4. The matte flame-retardant PC / ASA alloy material according to any one of claims 1-3, characterized in that, The mass ratio of the PC resin, ASA resin, reactive matting agent, flame retardant, and phosphorus-silicon flame retardant synergist is (62-73):(5-15):(3-4):10:(3-4); and / or, The mass ratio of the phosphorus-silicon preform to the nano-active polysiloxane is 100:(0.8-1.2); and / or, The mass ratio of the phosphate silicon, methylcyclosiloxane, silicate and crosslinking agent is 1:(2.5-3.5):(2-4):(0.4-0.6).

5. The matte flame-retardant PC / ASA alloy material according to any one of claims 1-3, characterized in that, The preparation method of the phosphorus-silicon flame retardant synergist includes the following steps: (1) The phosphate silicon, methylcyclosiloxane, silicate and crosslinking agent are stirred and reacted for 3 to 4 hours under the conditions of pH 7-8 and temperature 50℃~80℃ to obtain block phosphate silicon preform; (2) The phosphorus silicon preform is dried, pulverized and sieved to obtain phosphorus silicon preform powder, which is then fully mixed with the nano-active polysiloxane to obtain the phosphorus silicon flame retardant synergist.

6. The matte flame-retardant PC / ASA alloy material according to any one of claims 1-3, characterized in that, Includes the following components by mass percentage: PC resin: 60-80%, ASA resin: 5-15%, Toughening agent: 2-4%, Reactive matting agent: 2-4%, Flame retardant: 8-12%, Phosphorus-silicon flame retardant synergist: 2-4%, Anti-dripping agent: 0.3–0.6%, Antioxidant: 0.2-0.4%, Lubricating dispersant: 0.2-0.4%.

7. The matte flame-retardant PC / ASA alloy material according to claim 6, characterized in that, Includes the following components by mass percentage: PC resin: 62.7–77.1%, ASA resin: 5-15%, Toughening agent: 2-4%, Reactive matting agent: 2-4%, Flame retardant: 8-12%, Phosphorus-silicon flame retardant synergist: 2-4%, Anti-dripping agent: 0.3–0.6%, Antioxidant: 0.2-0.4%, Lubricating dispersant: 0.2-0.4%.

8. The matte flame-retardant PC / ASA alloy material according to claim 7, characterized in that, Includes the following components by mass percentage: PC resin: 62.7%–67.7% ASA resin: 10-15%, Toughening agent: 2-4%, Reactive matting agent: 3-4%, Flame retardant: 9-11%, Phosphorus-silicon flame retardant synergist: 3-4%, Anti-dripping agent: 0.4–0.6%, Antioxidant: 0.2-0.4%, Lubricating dispersant: 0.2-0.4%.

9. The matte flame-retardant PC / ASA alloy material according to claim 6, characterized in that, The toughening agent is one or more combinations of methyl methacrylate-butadiene-styrene graft copolymer, methyl methacrylate-silicone-acrylate copolymer, acrylonitrile-styrene-silicone-acrylate copolymer, and acrylate-grafted all-silicone copolymer, and the toughening agent has a core-shell structure; and / or, The anti-dripping agent is one or more combinations of polytetrafluoroethylene micro powder and polytetrafluoroethylene coated with acrylonitrile-styrene copolymer; and / or, The antioxidant is one or more combinations of Irganox 1010, Irganox 1076, and Irganox 168; and / or, The lubricating dispersant is one or more combinations of pentaerythritol phosphate, silicone powder, and montan wax.

10. The matte flame-retardant PC / ASA alloy material according to claim 9, characterized in that, The antioxidant is a mixture of Irganox 1076 and Irganox 168 in a mass ratio of 1:(3-5).

11. A method for preparing the matte flame-retardant PC / ASA alloy material according to any one of claims 6-10, characterized in that, Includes the following steps: 1) Mix PC resin, ASA resin, toughening agent, active matting agent, flame retardant, phosphorus-silicon flame retardant synergist, anti-dripping agent, antioxidant and lubricating dispersant evenly to obtain a premix; 2) The premixed material obtained in step 1) is added to the twin-screw extruder through the main feed port, and then melt-mixed, extruded and granulated in the twin-screw extruder to obtain the matte flame-retardant PC / ASA alloy material.

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