ABS (Acrylonitrile Butadiene Styrene) plate and preparation method thereof
By combining modified graphene oxide and nano-calcium carbonate with brominated flame retardants and the flame retardant mechanism of DOPO, the problem of decreased mechanical properties of ABS sheets during the flame retardant process is solved, resulting in ABS sheets with high flame retardancy and excellent mechanical properties, suitable for applications with high safety requirements.
Patent Information
- Application Number
- CN202511827474.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-05
- Publication Date
- 2026-01-20
AI Technical Summary
In the existing flame retardant process, adding a large amount of brominated flame retardant to ABS sheets reduces their mechanical properties and produces a large amount of dense smoke and molten dripping during combustion, limiting their application in situations with high safety requirements.
By employing the synergistic effect of modified graphene oxide, nano-calcium carbonate, and brominated flame retardants, the modified graphene oxide forms a dense carbon layer during combustion to isolate heat and oxygen. Combined with DOPO, it provides stable phosphorus-based flame retardancy. Furthermore, silane treatment improves the compatibility of graphene oxide with the ABS matrix and reduces the amount of brominated flame retardant required.
This invention achieves highly efficient flame retardancy and excellent mechanical properties in ABS sheets, possessing high flame retardancy, high mechanical strength, and good heat resistance. It avoids interface defects and the migration and precipitation of brominated flame retardants, thereby improving the safety and performance of the material.
Smart Images
Figure CN121362424A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of plastic plates, and particularly relates to an ABS plate and a preparation method thereof. BACKGROUND
[0002] ABS plate refers to a plastic plate made of acrylonitrile butadiene styrene (ABS). ABS plate (or ABS plastic plate) is widely used in the fields of advertising signs, furniture manufacturing, electronic product shells, automobile parts, etc. Its multifunctionality and good performance make it one of the commonly used plastic materials. ABS plate generally has good high strength and rigidity, can withstand certain load and stress, and has good heat resistance within a certain temperature range, is not easy to deform or soften, and has certain chemical stability, can resist the erosion of some chemicals and solvents. However, ABS resin itself is a flammable material, and a large amount of smoke and molten droplets will be generated during combustion, which greatly limits its application in occasions with higher safety requirements. Bromine flame retardant is widely used due to its high flame retardant efficiency and relatively low cost. However, in order to achieve a higher flame retardant grade, a large dose of bromine flame retardant needs to be added, which will reduce the mechanical properties of the plate.
[0003] Therefore, there is an urgent need for an ABS plate with efficient flame retardation and excellent mechanical properties. SUMMARY
[0004] The application aims to provide an ABS plate and a preparation method thereof, which solve the above technical problems in the prior art.
[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme: The application provides the following technical scheme: In a first aspect, the application provides an ABS plate, which specifically comprises the following components by weight: ABS resin 100 parts, nano calcium carbonate 10-40 parts, flame retardant 10-15 parts, compatibilizer 2-4 parts, dispersant 1-4 parts, antioxidant 1-3 parts, modified graphene oxide 0.5-2 parts, and light stabilizer 0.4-0.6 parts.
[0006] Preferably, the dispersant comprises at least one of stearic acid, polyethylene wax, and liquid paraffin.
[0007] Preferably, the flame retardant comprises at least one of tetrabromobisphenol A and brominated triazine.
[0008] Preferably, the compatibilizer is polypropylene grafted maleic anhydride.
[0009] Preferably, the antioxidant includes at least one of 2,2-methylenebis(4-methyl-6-tert-butylphenol), β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionoic acid octadecyl ester.
[0010] Preferably, the light stabilizer is at least one of UV-531 or UV-327.
[0011] Preferably, the ABS plate thickness is 1-3mm.
[0012] Preferably, the preparation method of the modified graphene oxide comprises the following steps: S1: mixing p-hydroxybenzaldehyde, triethylamine and ethyl acetate in a nitrogen atmosphere, stirring at room temperature, cooling, adding a phenyl dichlorophosphate solution dropwise, reacting after warming, filtering, removing impurities, and obtaining a dialdehyde intermediate; In the above process, the phenolic hydroxyl group of p-hydroxybenzaldehyde reacts with the chlorine atom of phenyl dichlorophosphate.
[0013] S2: adding the dialdehyde intermediate and silane-treated graphene oxide into 1,4-dioxane in a nitrogen atmosphere, stirring and reacting, then adding a DOPO solution, continuing to react after warming, cooling to room temperature, filtering, washing, and vacuum drying to obtain modified graphene oxide.
[0014] In the above process, the amino group of the silane-treated graphene oxide reacts with the aldehyde group of the dialdehyde intermediate to form a C=N double bond, and then the C=N reacts with the P-H bond of DOPO to graft to obtain modified graphene oxide.
[0015] Preferably, in S1, the preparation method of the phenyl dichlorophosphate solution is: dissolving 97-200g of phenyl dichlorophosphate in 0.5-1L of ethyl acetate to obtain a phenyl dichlorophosphate solution; the amount ratio of p-hydroxybenzaldehyde, triethylamine and ethyl acetate is 122-240g:100-200g:2-4L; the stirring treatment time is 10-20min; the cooling temperature is 0℃; the warming temperature is room temperature; the reaction time is 40-56h; the impurity removal method is: the filtrate is washed with saturated brine 2-3 times, dried with anhydrous magnesium sulfate, and then rotary evaporated to remove the ethyl acetate solvent.
[0016] Preferably, in the S2, the preparation method of the DOPO solution is: 21.6-43g DOPO is dissolved in 50-100mL 1,4-dioxane to obtain a DOPO solution; the dosage ratio of the dialdehyde intermediate, the silane-treated graphene oxide, and 1,4-dioxane is 22.8-45g:1-2g:100-200mL; the stirring reaction conditions are: the stirring reaction temperature is 80-90℃, and the stirring reaction time is 4-6h; the temperature rising temperature is 100℃; the continuous reaction time is 10-14h; the washing method is: the filter residue is washed with ethanol for 5-7 times; and the vacuum drying conditions are: the vacuum drying temperature is 55-65℃, and the vacuum drying time is 10-14h.
[0017] Preferably, the preparation method of the silane-treated graphene oxide comprises the following steps: The KH550 is dissolved in an ethanol aqueous solution, the pH is adjusted by glacial acetic acid, then the graphene oxide is added and ultrasonic dispersion is performed, then reaction is performed in a nitrogen atmosphere, centrifugation is performed, washing is performed, and vacuum drying is performed to obtain the silane-treated graphene oxide.
[0018] Preferably, the dosage ratio of the KH550, the ethanol aqueous solution, and the graphene oxide is 3.9-8g:200-400mL:10-15g; the volume ratio of ethanol to water in the ethanol aqueous solution is 8:1; the pH value is adjusted to 4.5; the ultrasonic dispersion time is 50-70min; the reaction conditions are: the reaction temperature is 70-80℃, and the reaction time is 20-28h; the centrifugation conditions are: the centrifugation speed is 9000-11000rpm, and the centrifugation time is 10-20min; the washing method is: after washing with anhydrous ethanol for 3-5 times, washing with deionized water for 1-2 times is further performed; and the vacuum drying conditions are: the vacuum drying temperature is 55-65℃, and the vacuum drying time is 10-14h.
[0019] In a second aspect, the present application further provides a preparation method of an ABS plate, comprising the following steps: The ABS resin and the dispersant are added into a stirrer and mixed for 5-10min at a rotation speed of 100-150rpm, then the nano calcium carbonate, the flame retardant, the compatilizer, the antioxidant, the modified graphene oxide, and the light stabilizer are added and mixed for 5-10min at a rotation speed of 150-200rpm, then the mixture is melt blended in a banbury mixer at 180-200℃ and at a rotation speed of 50-60rpm for 15-20min, then the melt blended product is preheated in a flat vulcanizing machine for 3-5min, then hot pressing is performed at 180-200℃ and at a pressure of 13-15MPa for 6-8min, then cold pressing is performed at a pressure of 10-12MPa for 3-5min, and then molding is performed to obtain the ABS plate.
[0020] In summary, due to the adoption of the above technical solutions, the present application has the following beneficial effects: 1.The ABS plate prepared by the present application realizes gas-solid synergistic flame-retardant effect through the synergistic effect of modified graphene oxide, bromine-based flame retardant and nano calcium carbonate; the modified graphene oxide in lamellar form can promote the formation of a dense carbon layer to insulate heat and oxygen during combustion; DOPO provides efficient and stable phosphorus-based flame-retardant effect, and covalent grafting reduces migration and precipitation, thereby improving flame retardancy and durability.
[0021] 2.The modified graphene oxide added in the ABS plate prepared by the present application improves the compatibility and interfacial bonding force of graphene oxide and the ABS matrix through silane treatment and covalent bonding, has good dispersibility, and avoids interface defects; as a nano reinforcing agent, the modified graphene oxide transmits and disperses stress, and by adding a small amount of the modified graphene oxide, the use amount of the bromine-based flame retardant is reduced, and the mechanical properties of the plate are improved.
[0022] 3.The modified graphene oxide added in the ABS plate prepared by the present application has good dispersion, limits the thermal motion of ABS polymer molecular chains as a physical crosslinking point, and improves the heat distortion temperature, thereby having good heat resistance; the present application obtains the ABS plate with high flame retardancy, high mechanical strength, high heat resistance and good appearance by adding the modified graphene oxide as a multifunctional nano filler, and has good application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.
[0024] Figure 1 is a mechanical histogram of the ABS plate of the present application; Figure 2 is a softening temperature fold line graph of the ABS plate of the present application. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. Embodiment 1
[0026] The present embodiment discloses a preparation method of silane-treated graphene oxide, comprising the following steps: 6g KH550 was dissolved in 300mL ethanol aqueous solution with a volume ratio of ethanol to water of 8:1, the pH was adjusted to 4.5 with glacial acetic acid, then 13g graphene oxide was added, ultrasonic dispersion for 60min, reaction at 75℃ for 24h under nitrogen atmosphere, then centrifuged at 10000rpm for 15min, washed with anhydrous ethanol for 4 times, washed with deionized water for 2 times, vacuum dried at 60℃ for 12h, to obtain silane treated graphene oxide. Example 2
[0027] The present embodiment discloses a preparation method of modified graphene oxide, comprising the following steps: S1: 180g p-hydroxybenzaldehyde, 150g triethylamine and 3L ethyl acetate were mixed under nitrogen atmosphere, stirred at room temperature for 15min, then cooled to 0℃, dropwise added with phenyl dichlorophosphate solution, warmed to room temperature for 48h, filtered, the filtrate was washed with saturated brine for 3 times, dried with anhydrous magnesium sulfate, and then rotary evaporation was performed to remove the ethyl acetate solvent, to obtain a dialdehyde intermediate; The phenyl dichlorophosphate solution was obtained by dissolving 150g phenyl dichlorophosphate in 0.75L ethyl acetate.
[0028] S2: 33g dialdehyde intermediate and 1.5g silane treated graphene oxide prepared in Example 1 were added into 150mL 1,4-dioxane under nitrogen atmosphere, stirred and reacted at 85℃ for 5h, then DOPO solution was added, warmed to 100℃ for 12h, cooled to room temperature, filtered, the residue was washed with ethanol for 6 times, vacuum dried at 60℃ for 12h, to obtain modified graphene oxide.
[0029] The DOPO solution was obtained by dissolving 32g DOPO in 75mL 1,4-dioxane. Example 3
[0030] The present embodiment discloses a preparation method of modified graphene oxide, comprising the following steps: S1: 122g p-hydroxybenzaldehyde, 200g triethylamine and 2L ethyl acetate were mixed under nitrogen atmosphere, stirred at room temperature for 20min, then cooled to 0℃, dropwise added with phenyl dichlorophosphate solution, warmed to room temperature for 40h, filtered, the filtrate was washed with saturated brine for 3 times, dried with anhydrous magnesium sulfate, and then rotary evaporation was performed to remove the ethyl acetate solvent, to obtain a dialdehyde intermediate; The phenyl dichlorophosphate solution was obtained by dissolving 97g phenyl dichlorophosphate in 1L ethyl acetate.
[0031] S2: In a nitrogen atmosphere, 22.8g of the dialdehyde intermediate and 2g of the silane-treated graphene oxide prepared in Example 1 were added into 100mL of 1,4-dioxane, and stirred at 90℃ for 4h, then the DOPO solution was added, and the temperature was raised to 100℃, and the reaction was continued for 14h, and then cooled to room temperature, filtered, and the filter residue was washed with ethanol for 5 times, and vacuum dried at 65℃ for 10h to obtain the modified graphene oxide.
[0032] The DOPO solution was prepared by dissolving 43g of DOPO in 50mL of 1,4-dioxane. Example 4
[0033] The present example discloses a preparation method of modified graphene oxide, comprising the following steps: S1: In a nitrogen atmosphere, 240g of p-hydroxybenzaldehyde, 100g of triethylamine and 4L of ethyl acetate were mixed, and stirred at room temperature for 10min, then cooled to 0℃, and the phenyl dichlorophosphate solution was added dropwise, and the temperature was raised to room temperature, and the reaction was continued for 56h, and then filtered, and the filtrate was washed with saturated brine for 2 times, dried with anhydrous magnesium sulfate, and then rotary evaporated to remove the ethyl acetate solvent to obtain the dialdehyde intermediate; The phenyl dichlorophosphate solution was prepared by dissolving 200g of phenyl dichlorophosphate in 0.5L of ethyl acetate.
[0034] S2: In a nitrogen atmosphere, 45g of the dialdehyde intermediate and 1g of the silane-treated graphene oxide prepared in Example 1 were added into 200mL of 1,4-dioxane, and stirred at 80℃ for 6h, then the DOPO solution was added, and the temperature was raised to 100℃, and the reaction was continued for 10h, and then cooled to room temperature, filtered, and the filter residue was washed with ethanol for 7 times, and vacuum dried at 55℃ for 14h to obtain the modified graphene oxide.
[0035] The DOPO solution was prepared by dissolving 21.6g of DOPO in 100mL of 1,4-dioxane. Example 5
[0036] The present example discloses a preparation method of ABS plate, comprising the following steps: 100g ABS resin, 3g stearic acid were added into a blender and mixed at 130 rpm for 7 min, then 25g nano calcium carbonate, 13g tetrabromobisphenol A, 3g polypropylene grafted maleic anhydride, 2g antioxidant 2,2-methylene bis(4-methyl-6-tert-butyl phenol), 1.5g modified graphene oxide and 0.5g UV-531 were added and mixed at 180 rpm for 8 min, then the mixture was melt blended in an internal mixer at 190℃ for 17 min at 55 rpm, then the melt blended product was preheated in a flat vulcanizing machine for 4 min, then hot pressed at 190℃ and 14 MPa for 7 min, and cold pressed at 11 MPa for 4 min to form an ABS plate.
[0037] The ABS resin was Cymene PA-777D; the thickness of the ABS plate was 2 mm. Example 6
[0038] This example discloses a method for preparing an ABS plate, comprising the following steps: 100g ABS resin, 1g polyethylene wax were added into a blender and mixed at 150 rpm for 5 min, then 40g nano calcium carbonate, 10g bromine triazine, 4g polypropylene grafted maleic anhydride, 1g β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, 2g modified graphene oxide and 0.4g UV-327 were added and mixed at 200 rpm for 5 min, then the mixture was melt blended in an internal mixer at 200℃ for 20 min at 50 rpm, then the melt blended product was preheated in a flat vulcanizing machine for 3 min, then hot pressed at 200℃ and 13 MPa for 8 min, and cold pressed at 10 MPa for 5 min to form an ABS plate.
[0039] The ABS resin was Cymene PA-777D; the thickness of the ABS plate was 2 mm. Example 7
[0040] This example discloses a method for preparing an ABS plate, comprising the following steps: Into a blender, 100 g ABS resin, 4 g liquid paraffin were added and mixed at 100 rpm for 10 min, then 10 g nano calcium carbonate, 15 g tetrabromobisphenol A, 2 g polypropylene grafted maleic anhydride, 3 g 2,2-methylenebis(4-methyl-6-tert-butylphenol), 0.5 g modified graphene oxide and 0.6 g UV-531 were added and mixed at 150 rpm for 10 min, then the mixture was melt blended in an internal mixer at 180 °C at 60 rpm for 15 min, then the melt blended product was preheated in a flat vulcanizing machine for 5 min, then hot-pressed at 180 °C and 15 MPa for 6 min, and then cold-pressed at 12 MPa for 3 min to form an ABS plate.
[0041] The ABS resin was Chi Mei PA-777D; the thickness of the ABS plate was 2 mm.
[0042] Comparative Example 1 Comparative Example 1 was compared with Example 5. In the preparation of the ABS plate of Comparative Example 1, no modified graphene oxide was added, and other conditions were unchanged.
[0043] Comparative Example 2 Comparative Example 2 was compared with Example 5. In the preparation of the ABS plate of Comparative Example 2, unmodified graphene oxide was used instead of graphene oxide, and other conditions were unchanged.
[0044] Comparative Example 3 Comparative Example 3 was compared with Example 5. In the preparation of the ABS plate of Comparative Example 3, no tetrabromobisphenol A and modified graphene oxide were added, and other conditions were unchanged.
[0045] Comparative Example 4 Comparative Example 4 was compared with Example 5. In the preparation of the ABS plate of Comparative Example 4, no tetrabromobisphenol A and nano calcium carbonate were added, and other conditions were unchanged.
[0046] Comparative Example 5 Comparative Example 5 was compared with Example 5. In the preparation of the ABS plate of Comparative Example 4, the amount of modified graphene oxide was 5 g, and other conditions were unchanged.
[0047] Experimental Example The properties of the ABS plates prepared in Examples 5-7 and Comparative Examples 1-5 were tested, and the test standards and results are shown in Table 1: Table 1
[0048] According to Table 1 and from Examples 5-7 and Comparative Examples 1-5, the ABS plate prepared in Example 3 has good flame retardancy, mechanical properties and heat resistance. As can be seen from the comparison of Comparative Examples 1-4 and Example 5, the modified graphene oxide added can effectively disperse in the ABS matrix and produce good interface bonding, play a reinforcing role, and the modified graphene oxide limits the thermal motion of the polymer molecular chain material, improves the heat resistance of the plate, and the absence of the modified graphene oxide will cause the synergistic effect to be lost, and the unmodified graphene oxide will cause the dispersibility to be reduced, so that the flame retardancy, mechanical properties and heat resistance are poor. As can be seen from the comparison of Comparative Example 5 and Example 5, too much modified graphene oxide will cause the flame retardancy, mechanical properties and heat resistance of the ABS plate to be reduced due to agglomeration.
[0049] The above description is only a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacements or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application.
[0050] The above disclosed preferred embodiments of the present application are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the present application to the specific embodiments. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited by the claims and their entire scope and equivalents.
Claims
1. An ABS sheet material, characterized by, The raw material of the ABS plate is composed of the following components in mass (weight) parts: ABS resin 100 parts, nano calcium carbonate 10-40 parts, flame retardant 10-15 parts, compatibility agent 2-4 parts, dispersing agent 1-4 parts, antioxidant 1-3 parts, modified graphene oxide 0.5-2 parts, light stabilizer 0.4-0.6 parts.
2. The ABS sheet according to claim 1, characterized in that, The preparation method of the modified graphene oxide comprises the following steps: S1: In a nitrogen atmosphere, p-hydroxybenzaldehyde, triethylamine and ethyl acetate are mixed, stirred at room temperature, cooled, and then a phenyl dichlorophosphate solution is added dropwise, heated and reacted, filtered, impurities removed, and a dialdehyde intermediate obtained; S2: In a nitrogen atmosphere, the dialdehyde intermediate and silane-treated graphene oxide are added to 1,4-dioxane, stirred and reacted, then a DOPO solution is added, heated, and continued to react, cooled to room temperature, filtered, washed, and vacuum dried to obtain modified graphene oxide.
3. The ABS sheet according to claim 2, wherein, In S1, the preparation method of the phenyl dichlorophosphate solution is: 97-200g of phenyl dichlorophosphate is dissolved in 0.5-1L of ethyl acetate to obtain a phenyl dichlorophosphate solution; the amount ratio of p-hydroxybenzaldehyde, triethylamine and ethyl acetate is 122-240g:100-200g:2-4L; the stirring treatment time is 10-20min; the cooling temperature is 0℃; the heating temperature is room temperature; the reaction time is 40-56h; the impurity removal method is: the filtrate is washed with saturated brine 2-3 times, dried with anhydrous magnesium sulfate, and then rotary evaporation is performed to remove the ethyl acetate solvent.
4. The ABS sheet according to claim 1, wherein, In S2, the preparation method of the DOPO solution is: 21.6-43g of DOPO is dissolved in 50-100mL of 1,4-dioxane to obtain a DOPO solution; the amount ratio of the dialdehyde intermediate, silane-treated graphene oxide and 1,4-dioxane is 22.8-45g:1-2g:100-200mL; the stirring reaction conditions are: the stirring reaction temperature is 80-90℃, and the stirring reaction time is 4-6h; the heating temperature is 100℃; the continued reaction time is 10-14h; the washing method is: the filter residue is washed with ethanol 5-7 times; the vacuum drying conditions are: the vacuum drying temperature is 55-65℃, and the vacuum drying time is 10-14h.
5. The ABS sheet according to claim 2, wherein, The preparation method of the silane-treated graphene oxide comprises the following steps: KH550 is dissolved in an ethanol aqueous solution, the pH is adjusted with glacial acetic acid, then graphene oxide is added and ultrasonically dispersed, then reacted in a nitrogen atmosphere, centrifuged, washed, and vacuum dried to obtain silane-treated graphene oxide.
6. The ABS sheet according to claim 1, wherein The amount ratio of the KH550, the ethanol aqueous solution, and the graphene oxide is 3.9-8 g: 200-400 mL: 10-15 g; the volume ratio of ethanol to water in the ethanol aqueous solution is 8:1; the pH value is adjusted to 4.5; the ultrasonic dispersion time is 50-70 min; the reaction conditions are as follows: the reaction temperature is 70-80 ℃, and the reaction time is 20-28 h; the centrifugal conditions are as follows: the centrifugal speed is 9000-11000 rpm, and the centrifugal time is 10-20 min; the washing method is as follows: the mixture is washed with anhydrous ethanol for 3-5 times, and then washed with deionized water for 1-2 times; and the vacuum drying conditions are as follows: the vacuum drying temperature is 55-65 ℃, and the vacuum drying time is 10-14 h.
7. The ABS sheet according to claim 1, wherein The flame retardant comprises at least one of tetrabromobisphenol A and brominated triazine; the dispersant comprises at least one of stearic acid, polyethylene wax, and liquid paraffin; and the thickness of the ABS plate is 1-3 mm.
8. The ABS sheet according to claim 1, wherein The compatilizer is polypropylene grafted maleic anhydride; and the light stabilizer is at least one of UV-531 or UV-327.
9. The ABS sheet according to claim 1, wherein, The antioxidant comprises at least one of 2,2-methylenebis(4-methyl-6-tert-butylphenol) and beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid octadecyl ester.
10. A method of producing an ABS sheet according to any one of claims 1 to 9, characterized by, The method comprises the following steps: The ABS resin and the dispersant are mixed in a mixer at a rotating speed of 100-150 rpm for 5-10 min, then the nano calcium carbonate, the flame retardant, the compatilizer, the antioxidant, the modified graphene oxide, and the light stabilizer are added and mixed at a rotating speed of 150-200 rpm for 5-10 min, then the mixture is melt blended in an internal mixer at 180-200 ℃ and at a rotating speed of 50-60 rpm for 15-20 min, the melt blended mixture is preheated in a flat vulcanizing machine for 3-5 min, then the mixture is hot-pressed at 180-200 ℃ and at a pressure of 13-15 MPa for 6-8 min, and then cold-pressed at a pressure of 10-12 MPa for 3-5 min to form an ABS plate.