Scratch self-repairing polycarbonate and method for preparing the same

Abstract

The application provides a scratch self-repairing polycarbonate and a preparation method thereof. The polycarbonate raw material comprises a bistriazine amino stilbene-disulfonic acid compound. The method comprises the following steps: adding a compound containing a bisphenol hydroxyl group, an alkali metal hydroxide and sodium hydrosulfite into water to obtain a homogeneous aqueous solution a; adding the bistriazine amino stilbene-disulfonic acid compound into the aqueous solution a to obtain a homogeneous aqueous solution b; adding an oily solvent into the aqueous solution b to obtain a water-oil two-phase mixture c; introducing phosgene and lye into the water-oil mixture c to obtain a solution d; adding a capping agent and a catalyst into the solution d and continuously introducing the lye to obtain a reaction product e; and separating the reaction product e into two phases, cleaning and removing the solvent to obtain a PC-bistriazine amino stilbene-disulfonic acid compound copolymer solid product f. The polycarbonate has the scratch self-repairing performance and can realize the integrity recovery of the surface morphology in a short time.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials, specifically relating to a scratch-repairing polycarbonate and its preparation method. Background Technology

[0002] Polycarbonate is a versatile thermoplastic engineering plastic used in various fields such as automotive, electronics, medical devices, aerospace, and construction. As one of the five major engineering plastics, the domestic and international demand for polycarbonate has been increasing in recent years.

[0003] Although the demand for polycarbonate is increasing year by year, its lifespan is short due to its poor scratch resistance, low surface hardness, and susceptibility to mechanical scratches during use. In applications where high aesthetics and integrity of the product surface are required, such as mobile phone casings, monitor casings, and automotive interiors, the use of polycarbonate is limited. Therefore, developing polycarbonate with self-healing scratch-resistant properties is essential.

[0004] Currently, there is relatively little research on polycarbonate with scratch self-healing capabilities. The usual approach involves modifying the surface of the polycarbonate material and adding a surface coating. Patent CN111548731A adds a modified silica sol coating to the polycarbonate surface, giving it room-temperature self-healing properties. However, the coating is applied to the polycarbonate surface by spraying, making it difficult to guarantee uniformity and resulting in a lack of durability; it is prone to peeling off after prolonged use. Patent CN110281613 discloses a method for preparing a polycarbonate board with self-healing capabilities by applying an anti-fogging coating to the surface of the polycarbonate board. However, its preparation method is cumbersome, and the coating is prone to peeling off.

[0005] The method of adding a coating to the surface of polycarbonate matrix to enable polycarbonate to have scratch self-healing function has the following problems: the coating process has high requirements, which increases the cost; the uniformity of the coating is difficult to guarantee; the coating is at risk of peeling off and failing after long-term use; adding a coating causes changes in the thickness of polycarbonate, which limits its application in application scenarios with high dimensional requirements. Summary of the Invention

[0006] One objective of this invention is to provide a polycarbonate with scratch self-healing function. This polycarbonate has a stable molecular structure and chemical properties, exhibits excellent scratch self-healing performance, and its preparation process is simple and easily achievable for continuous industrial production.

[0007] To achieve the above-mentioned objectives and technical effects, the present invention adopts the following technical solution:

[0008] A scratch-healing polycarbonate, the polycarbonate comprising the following structure:

[0009]

[0010] Wherein, R1 is a capping group, preferably a monophenolic compound residue, and X is a C-containing group. 1-15 Hydroxyalkyl groups contain an N-group, where n is an integer from 5 to 80.

[0011] In one embodiment of the present invention, R1 in the polycarbonate is a residue of phenol and / or p-tert-butylphenol, and X is a C-containing residue. 2-4 hydroxyalkyl groups containing NH and 2 C atoms 2-4 N- and C-containing hydroxyalkyl groups 2-4 Hydroxyalkyl and C 1-10 One or more of the alkyl group N.

[0012] This invention involves a condensation polymerization reaction between a bis(triazine)-aminobis(diphenylethylene)-disulfonic acid compound and phosgene and a compound containing bisphenol hydroxyl groups during polymerization. Relying on free radical polymerization via carbon-carbon double bonds, segments of the bis(triazine)-aminobis(diphenylethylene)-disulfonic acid compound are embedded into polycarbonate molecules, thus designing and modifying the PC molecular structure. This process results in a stable molecular structure and chemical properties, solving problems such as poor uniformity, additive precipitation, and high secondary processing costs associated with traditional coating modification methods. Furthermore, by covalently linking the bis(triazine)-aminobis(diphenylethylene)-disulfonic acid compound to polycarbonate molecules, hydrogen bonds, coordination bonds, ionic bonds, and triazine heterocyclic structures are introduced into the polycarbonate molecule. This combination of hydrogen bonds, coordination bonds, ionic bonds, and shape memory effects enables self-healing through multiple dynamic reversible crosslinking processes.

[0013] Another object of the present invention is to provide a method for preparing scratch-healing polycarbonate.

[0014] A method for preparing self-healing polycarbonate, the method comprising the following steps:

[0015] S1: Add a compound containing bisphenol hydroxyl groups, an alkali metal hydroxide, and sodium hydrosulfite to water to react and obtain a homogeneous aqueous solution a;

[0016] S2: Add bis(triazine)aminobis(diphenyl)ethylene-disulfonic acid compound to aqueous solution a to obtain homogeneous aqueous solution b;

[0017] S3: Add an oily solvent to aqueous solution b to obtain a water-oil two-phase mixture c;

[0018] S4: Phosgene and alkaline solution are introduced into the water-oil mixture c to react and obtain solution d;

[0019] S5: Add end-capping agent and catalyst to solution d, and continuously pass alkaline solution through to obtain reaction product e;

[0020] S6: Allow the reaction product e to stand for two-phase separation, wash, and remove solvent to obtain PC-bistriazine-aminobis(phenylene)-disulfonic acid compound copolymer solid product f;

[0021] Optionally, S7: The solid product f is placed in a high-temperature mold to obtain PC with scratch self-healing function.

[0022] In one embodiment of the present invention, the bisphenol hydroxyl-containing compound in S1 is preferably bisphenol A and / or tetrabromobisphenol A; the alkali metal hydroxide is sodium hydroxide and / or potassium hydroxide; the sodium hydrosulfite is a strong reducing sulfate, preferably sodium dithionite and / or sodium thiosulfate; preferably, the concentration of the bisphenol hydroxyl-containing compound in aqueous solution a is 10-18 wt%; preferably, the concentration of the alkali metal hydroxide in aqueous solution a is 4-6 wt%; preferably, the concentration of the sodium hydrosulfite in aqueous solution a is 0.1-0.8 wt%.

[0023] In one embodiment of the present invention, the reaction temperature of S1 is 20℃-40℃, preferably 30℃-37℃; the reaction time is 15-40 min; and the reaction is carried out in an inert gas atmosphere.

[0024] In one embodiment of the present invention, the molar ratio of the bistriazine-aminobis(phenylene)disulfonic acid compound described in S2 to the compound containing bisphenol hydroxyl groups is (0.01-0.1):1;

[0025] In one embodiment of the present invention, the reaction temperature of S2 is 20℃-40℃, preferably 30℃-37℃; the reaction time is 10-30 min; and the reaction is carried out in an inert gas atmosphere.

[0026] In one embodiment of the present invention, the oil phase solvent in S3 is a chlorinated hydrocarbon, preferably one or more of dichloromethane, dichloroethane, trichloroethane, and tetrachloroethane; preferably, the mass ratio of the oil solvent to the aqueous solution a is (0.5-2):1, more preferably (0.9-1.1):1.

[0027] In one embodiment of the present invention, the molar ratio of phosgene to the compound containing bisphenol hydroxyl groups in S4 is (1.2-1.5):1.

[0028] In one embodiment of the present invention, the alkali in S4 is an alkaline hydroxide, preferably an alkali metal hydroxide, more preferably sodium hydroxide and / or potassium hydroxide; preferably, the concentration of the alkali solution is 10wt%-50wt%, more preferably 25wt%-35wt%.

[0029] In one embodiment of the present invention, the temperature in S4 is 20-35°C and the reaction time is 5-30 min.

[0030] In one embodiment of the present invention, the capping agent in S5 is a monophenol compound, preferably phenol and / or p-tert-butylphenol; preferably, the molar ratio of the capping agent to the compound containing bisphenol hydroxyl groups is (0.02-0.04):1.

[0031] In one embodiment of the present invention, the catalyst in S5 is a nitrogen compound that catalyzes interfacial polycondensation reactions, preferably one or more of triethylamine, N-ethylpiperidine, and N-isopropylpiperidine; preferably, the molar ratio of the catalyst to the compound containing bisphenol hydroxyl groups is (0.002-0.004):1.

[0032] In one embodiment of the present invention, the alkali in S5 is an alkaline hydroxide, preferably an alkali metal hydroxide, more preferably sodium hydroxide and / or potassium hydroxide; preferably, the concentration of the alkali solution is 10wt%-50wt%, more preferably 25wt%-35wt%.

[0033] In one embodiment of the present invention, the temperature in step S5 is 25-37°C and the reaction time is 15-40 min.

[0034] In one embodiment of the present invention, the cleaning described in S6 is acid washing and water washing; preferably, a strong acid is used for acid washing; preferably, the mass ratio of acid to oil phase during acid washing is (0.1-0.5):1.

[0035] In one embodiment of the present invention, the solid product e in S6 contains less than 1 ppm of catalyst, less than 20 ppm of chloride ions, and less than 200 ppm of oily solvent.

[0036] In one embodiment of the present invention, the mold temperature in S7 is 240℃-360℃, and the holding time is 10min-180min.

[0037] Another object of the present invention is to provide a use for a scratch-healing polycarbonate.

[0038] The use of a scratch-repairing polycarbonate, wherein the polycarbonate is the polycarbonate described above or the polycarbonate prepared by the method described above, wherein the polycarbonate is used in polycarbonate products requiring scratch self-repair, preferably in polycarbonate products in the fields of electronic products, automotive interiors, and optical lighting.

[0039] Compared with the prior art, the present invention has the following advantages and effects:

[0040] 1) The scratch-healing polycarbonate material prepared by this invention designs and modifies the molecular structure of PC, and its molecular structure and chemical properties are stable, which can solve the problems of poor uniformity, additive precipitation and high secondary processing cost of traditional coating modification methods.

[0041] 2) The polycarbonate described in this invention has a scratch self-healing function, which can restore the scratches on polycarbonate products to their original state, extend the service life of polycarbonate materials, and greatly improve their application value.

[0042] 3) The scratch-healing polycarbonate preparation method described in this invention is simple, easy to operate, and easy to achieve industrial continuous production. Detailed Implementation

[0043] The technical solution of the present invention will be described in detail below with reference to preferred embodiments. The embodiments described herein are merely illustrative and do not limit the scope of the invention. Raw materials used in the experiment:

[0044] Bisphenol A: Industrial grade, purchased from Changchun Chemical.

[0045] Tetrabromobisphenol A: Industrial grade, purchased from Changchun Chemical.

[0046] Bistriazine-aminobis(phenylene) disulfonic acid compound: analytical grade, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0047] Sodium hydroxide: analytical grade, purchased from Tianjin Kemeo Chemical Reagent Co., Ltd.

[0048] Potassium hydroxide: analytical grade, purchased from Tianjin Kemeo Chemical Reagent Co., Ltd.;

[0049] Sodium hydrosulfite: Industrial grade, purchased from Shanghai Mairui Chemical Technology Co., Ltd.;

[0050] Phosgene: Industrial grade, Wanhua Chemical;

[0051] Dichloromethane: analytical grade, purchased from Beijing Innocare Chemical Reagent Co., Ltd.;

[0052] Dichloroethane: analytical grade, purchased from Beijing InnoCai Chemical Reagent Co., Ltd.;

[0053] Triethylamine: analytical grade, purchased from Tianjin Kemeo Technology Co., Ltd.;

[0054] p-tert-Butylphenol: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0055] Pure water: Industrial grade, Wanhua Chemical.

[0056] The NMR spectrum of polycarbonate was determined using a Bruker AvⅢ nuclear magnetic resonance spectrometer from Switzerland, with deuterated chloroform as the solvent.

[0057] The gloss of polycarbonate surfaces was measured using a miniature gloss meter to characterize their self-healing rate. The specific procedure was as follows: A polycarbonate sample was placed on a horizontal table to measure the initial gloss A0. Then, the polycarbonate surface was scratched horizontally and vertically 10 times each using 0000# steel wool. The gloss A1 of the damaged surface was then measured. After resting at room temperature for 2 hours, the gloss A2 of the repaired surface was measured. The scratch repair rate of the polycarbonate surface was calculated as: (A2 - A1) / (A0 - A1) × 100%.

[0058] Example 1

[0059] Under a nitrogen atmosphere, 1000g of deionized water was added to a 5L jacketed flask, followed by 116.4g of bisphenol A solid, 46.6g of sodium hydroxide solid, and 1.16g of sodium dithionite. The temperature was set to 30℃, and stirring was started at a speed of 300 rpm for 30 minutes until the solids were completely dissolved, resulting in a homogeneous aqueous solution.

[0060] 2.97 g of a bis(triazinyl)aminobis(diphenylethylene)disulfonic acid compound with the following structural formula was added to the above homogeneous aqueous solution:

[0061]

[0062] Set the temperature to 30℃, turn on the stirrer, set the stirring speed to 300 rpm, and stir for 15 minutes to obtain a homogeneous aqueous solution;

[0063] Adding 582g of dichloromethane to the above homogeneous aqueous solution yields a water-oil two-phase mixture.

[0064] Adjust the temperature to 20℃, turn on the stirrer, set the stirring speed to 300 rpm, and introduce 60.65 g of gaseous phosgene into the flask at a rate of 6 g / min. At the same time, introduce 25 wt% sodium hydroxide solution into the flask at a rate of 6 g / min. Stop the reaction after 5 minutes to obtain the intermediate product solution.

[0065] Adjust the temperature to 25℃, turn on the stirrer, set the stirring speed to 300 rpm, and while stirring, add 1.53 g of p-tert-butylphenol and 0.10 g of triethylamine to the above intermediate product solution, and continuously pass 25 wt% sodium hydroxide solution at a rate of 0.5 g / min. Stop the reaction after 15 minutes to obtain the final reaction product.

[0066] After the reaction product was allowed to stand, oil-water separation was performed. The oil phase was first washed with 58.2 g of 1 wt% hydrochloric acid solution, and then washed with 700 g of deionized water. After removing dichloromethane from the oil phase, a solid copolymer of PC-bistriazine-aminobis(phenylene)ethylene-disulfonic acid compound was obtained. The catalyst content was 0.21 ppm, the chloride ion content was 12 ppm, and the oily solvent content was 54 ppm.

[0067] single-chain segment 1 H NMR (CDCl3, 500MHZ): δ1.35 (s, 18H), 1.72 (s, 24H), 2.00 (s, 2H), 3.57 (m, 4H), 4.00 (m, 4H), 4.56 (t, J=17.3Hz, 4H), 7.05 (s, 2H), 7.12 (s , 2H), 7.21 (d, J=8.2Hz, 20H), 7.27 (d, J=8.2Hz, 16H), 7.44 (m, 2H), 7.52 (d, J=8.2Hz, 2H), 7.53 (d, J=8.2Hz, 2H), 7.56 (d, J=7.7Hz, 4H).

[0068] The solid product was placed in a flat vulcanizing machine, the temperature was set to 240℃, and the holding time was 10 minutes to obtain a PC test piece with a thickness of 3 mm.

[0069] The self-healing rate of scratches on polycarbonate surfaces was 87.5% when tested with a miniature gloss meter.

[0070] Example 2

[0071] Under a nitrogen atmosphere, 1000g of deionized water was added to a 5L jacketed flask. Then, 200g of bisphenol A solid, 70g of potassium hydroxide solid and 2g of sodium dithionite were added. The temperature was set to 33℃, stirring was started, and the stirring speed was set to 300 rpm. The mixture was stirred for 25 minutes until the solids were completely dissolved, resulting in a homogeneous aqueous solution.

[0072] 24.35 g of a bis(triazine)-aminobis(phenylene)-disulfonic acid compound with the following structural formula was added to the above homogeneous aqueous solution:

[0073]

[0074] Set the temperature to 33℃, turn on the stirrer, set the stirring speed to 300 rpm, and stir for 20 minutes to obtain a homogeneous aqueous solution;

[0075] 1280g of dichloroethane was added to the above homogeneous aqueous solution to obtain a water-oil two-phase mixture.

[0076] Adjust the temperature to 30℃, turn on the stirrer, set the stirring speed to 300 rpm, and introduce 113 g of gaseous phosgene into the flask at a rate of 6 g / min. At the same time, introduce 30% potassium hydroxide solution into the flask at a rate of 6 g / min. Stop the reaction after 20 minutes to obtain the intermediate product solution.

[0077] Adjust the temperature to 30℃, turn on the stirrer, set the stirring speed to 300 rpm, and while stirring, add 4g of p-tert-butylphenol and 0.27g of triethylamine to the above intermediate product solution, and continuously pass 30% potassium hydroxide solution at a rate of 0.5g / min. Stop the reaction after 25 minutes to obtain the final reaction product.

[0078] After the reaction product was allowed to stand, oil-water separation was performed. The oil phase was first washed with 384g of 1% hydrochloric acid solution, and then washed with 700g of deionized water. After removing dichloromethane from the oil phase, a solid copolymer of PC-bistriazine-aminobis(phenylene)ethylene-disulfonic acid compound was obtained. The catalyst content was 0.33ppm, the chloride ion content was 11ppm, and the oily solvent content was 37ppm.

[0079] single-chain segment 1 H NMR (CDCl3, 500MHZ): δ1.35 (s, 18H), 1.72 (s, 18H), 2.00 (s, 2H), 3.57 (m, 4H), 4.00 (m, 4H), 4.56 (t, J=17.3Hz, 4H), 7.05 (s, 2H), 7.12 (s , 2H), 7.21 (d, J=8.2Hz, 16H), 7.27 (d, J=8.2Hz, 12H), 7.44 (m, 2H), 7.52 (d, J=8.2Hz, 2H), 7.53 (d, J=8.2Hz, 2H), 7.56 (d, J=7.7Hz, 4H).

[0080] The solid product was placed in a flat vulcanizing machine, the temperature was set to 280℃, and the holding time was 60min to obtain a PC test piece with a thickness of 3mm.

[0081] The self-healing rate of scratches on polycarbonate surfaces was 91.6% when tested with a miniature gloss meter.

[0082] Example 3

[0083] Under a nitrogen atmosphere, 1000g of deionized water was added to a 5L jacketed flask. Then, 238g of tetrabromobisphenol A solid, 79.37g of sodium hydroxide solid, and 5.29g of sodium dithionite were added. The temperature was set to 35℃, and stirring was started at a speed of 300 rpm. The mixture was stirred for 30 minutes until the solids were completely dissolved, resulting in a homogeneous aqueous solution.

[0084] 25.54 g of a bis(triazine)-aminobis(phenylene)-disulfonic acid compound with the following structural formula was added to the above homogeneous aqueous solution:

[0085]

[0086] Set the temperature to 35℃, turn on the stirrer, set the stirring speed to 300 rpm, and stir for 25 minutes to obtain a homogeneous aqueous solution;

[0087] 1984 g of dichloromethane was added to the above homogeneous aqueous solution to obtain a water-oil two-phase mixture.

[0088] Adjust the temperature to 35℃, turn on the stirrer, set the stirring speed to 300 rpm, and introduce 60.64 g of gaseous phosgene into the flask at a rate of 6 g / min. At the same time, introduce 32% sodium hydroxide solution into the flask at a rate of 6 g / min. Stop the reaction after 25 minutes to obtain the intermediate product solution.

[0089] Adjust the temperature to 35℃, turn on the stirrer, set the stirring speed to 300 rpm, and while stirring, add 2.63 g of p-tert-butylphenol and 0.18 g of triethylamine to the above intermediate product solution, and continuously pass 32% sodium hydroxide solution at a rate of 0.5 g / min. Stop the reaction after 30 minutes to obtain the final reaction product.

[0090] After the reaction product was allowed to stand, oil-water separation was performed. The oil phase was first washed with 992g of 1% hydrochloric acid solution, and then washed with 700g of deionized water. After removing dichloromethane from the oil phase, a solid copolymer product of PC-bis(triazine)-aminobis(phenyl)ethylene-disulfonic acid compound was obtained. The catalyst content was 0.37ppm, the chloride ion content was 18ppm, and the oily solvent content was 49ppm.

[0091] The solid product was placed in a flat vulcanizing machine, the temperature was set to 320℃, and the holding time was 120min to obtain a PC test piece with a thickness of 3mm.

[0092] The self-healing rate of scratches on polycarbonate surfaces was 95.3% as tested using a miniature gloss meter.

[0093] Example 4

[0094] Under a nitrogen atmosphere, 1000g of deionized water was added to a 5L jacketed flask. Then, 239.36g of bisphenol A solid, 79.79g of sodium hydroxide solid, and 10.64g of sodium dithionite were added. The temperature was set to 37℃, and stirring was started at a speed of 300 rpm. The mixture was stirred for 40 minutes until the solids were completely dissolved, resulting in a homogeneous aqueous solution.

[0095] 102.25 g of a bis(triazine)-aminobis(phenylene)-disulfonic acid compound with the following structural formula was added to the above homogeneous aqueous solution:

[0096]

[0097] Set the temperature to 37℃, turn on the stirrer, set the stirring speed to 300 rpm, and stir for 30 minutes to obtain a homogeneous aqueous solution;

[0098] 2660g of dichloroethane was added to the above homogeneous aqueous solution to obtain a water-oil two-phase mixture.

[0099] Adjust the temperature to 35℃, turn on the stirrer, set the stirring speed to 300 rpm, and introduce 155.90 g of gaseous phosgene into the flask at a rate of 6 g / min. At the same time, introduce 35% sodium hydroxide solution into the flask at a rate of 6 g / min. Stop the reaction after 30 minutes to obtain the intermediate product solution.

[0100] Adjust the temperature to 37℃, turn on the stirrer, set the stirring speed to 300 rpm, and while stirring, add 6.30 g of p-tert-butylphenol and 0.42 g of triethylamine to the above intermediate product solution, and continuously pass 35% sodium hydroxide solution at a rate of 0.5 g / min. Stop the reaction after 40 minutes to obtain the final reaction product.

[0101] After the reaction product was allowed to stand, oil-water separation was performed. The oil phase was first washed with 1330g of 1% hydrochloric acid solution, and then washed with 700g of deionized water. After removing dichloroethane from the oil phase, a solid copolymer of PC-bistriazine-aminobis(phenylene)ethylene-disulfonic acid compound was obtained. The catalyst content was 0.41ppm, the chloride ion content was 16ppm, and the oily solvent content was 29ppm.

[0102] The solid product was placed in a flat vulcanizing machine, the temperature was set to 360℃, and the holding time was 180min to obtain a PC test piece with a thickness of 3mm.

[0103] The self-healing rate of scratches on polycarbonate surfaces was 98.2% when tested with a miniature gloss meter.

[0104] Comparative Example 1

[0105] Currently, all patents for the preparation of polycarbonate with scratch self-healing function involve traditional coating modification methods, and there are no reports of technologies that chemically modify polycarbonate by embedding functional monomers into the polycarbonate chain segments through reaction. This comparative example compares the methods with those using coating modification.

[0106] First, ordinary polycarbonate test pieces without special functional groups were prepared. The preparation method was the same as in Example 1, except that the bis(triazine)aminobis(diphenylethylene)disulfonic acid compound was not added. The prepared polycarbonate test pieces had a catalyst content of 0.35 ppm, a chloride ion content of 24 ppm, and an oily solvent content of 51 ppm.

[0107] The solid product was placed in a flat vulcanizing machine, the temperature was set to 320℃, and the holding time was 60min to obtain a PC test piece with a thickness of 3mm.

[0108] A scratch-healing coating was prepared according to the method described in Example 1 of patent CN111548731A, and the coating was sprayed onto a 3mm PC test piece.

[0109] The self-healing rate of scratches on polycarbonate surfaces was 77.3% when tested with a miniature gloss meter.

Claims

1. A method for preparing scratch-resistant self-healing polycarbonate, characterized in that, The method includes the following steps: S1: Add a compound containing bisphenol hydroxyl groups, an alkali metal hydroxide, and sodium hydrosulfite to water to react and obtain a homogeneous aqueous solution a; S2: Add bis(triazine)aminobis(diphenyl)ethylene-disulfonic acid compound to aqueous solution a to obtain homogeneous aqueous solution b; S3: Add an oily solvent to aqueous solution b to obtain a water-oil two-phase mixture c; S4: Phosgene and alkaline solution are introduced into the water-oil mixture c to react and obtain solution d; S5: Add end-capping agent and catalyst to solution d, and continuously pass alkaline solution to obtain reaction product e; S6: Allow the reaction product e to stand for two-phase separation, wash, and remove solvent to obtain PC-bistriazine-aminobis(phenylene)-disulfonic acid compound copolymer solid product f; Optionally, S7: The solid product f is placed in a high-temperature mold to obtain PC with scratch self-healing function.

2. The method according to claim 1, characterized in that, The compounds containing bisphenol hydroxyl groups in S1 are bisphenol A and / or tetrabromobisphenol A; the alkali metal hydroxides are sodium hydroxide and / or potassium hydroxide. And / or, the reaction temperature of S1 is 20℃-40℃; the reaction time is 15-40min; and the reaction is carried out in an inert gas atmosphere.

3. The method according to claim 2, characterized in that, The concentration of the bisphenol hydroxyl compound in S1 in aqueous solution a is 10-18 wt%. The concentration of alkali metal hydroxide in aqueous solution a in S1 is 4-6 wt%; The concentration of sodium hydrosulfite in aqueous solution a in S1 is 0.1-0.8 wt%; And / or, the reaction temperature of S1 is 30℃-37℃.

4. The method according to claim 1, characterized in that, The molar ratio of the bis(triazine)-aminobis(phenyl)ethylene-disulfonic acid compound to the compound containing bisphenol hydroxyl groups in S2 is (0.01-0.1):1; And / or, the reaction temperature of S2 is 20℃-40℃; the reaction time is 10-30min; and the reaction is carried out in an inert gas atmosphere.

5. The method according to claim 4, characterized in that, The reaction temperature of S2 is 30℃-37℃.

6. The method according to claim 1, characterized in that, The oily solvent mentioned in S3 is a chlorinated hydrocarbon.

7. The method according to claim 6, characterized in that, The oily solvent mentioned in S3 is one or more of dichloromethane, dichloroethane, trichloroethane, and tetrachloroethane; The mass ratio of the oily solvent to the aqueous solution a in S3 is (0.5-2):

1.

8. The method according to claim 7, characterized in that, The mass ratio of the oily solvent to the aqueous solution a in S3 is (0.9-1.1):

1.

9. The method according to claim 1, characterized in that, The molar ratio of phosgene to the compound containing bisphenol hydroxyl groups in S4 is (1.2-1.5):1; And / or, the base in S4 is an alkaline hydroxide; And / or, the temperature in S4 is 20-35℃ and the reaction time is 5-30min.

10. The method according to claim 9, characterized in that, The alkali in S4 is an alkali metal hydroxide; The concentration of alkali solution in S4 is 10wt%-50wt%.

11. The method according to claim 10, characterized in that, The alkali in S4 is sodium hydroxide and / or potassium hydroxide; The concentration of alkali solution in S4 is 25wt%-35wt%.

12. The method according to claim 1, characterized in that, The capping agent in S5 is a monophenol compound; And / or, the catalyst in S5 is a nitrogen compound that catalyzes interfacial polycondensation reactions; And / or, the base in S5 is an alkaline hydroxide; And / or, the temperature in S5 is 25-37℃ and the reaction time is 15-40min.

13. The method according to claim 12, characterized in that, The end-capping agent in S5 is phenol and / or p-tert-butylphenol; In S5, the molar ratio of the capping agent to the compound containing bisphenol hydroxyl groups is (0.02-0.04):1; And / or, the catalyst in S5 is one or more of triethylamine, N-ethylpiperidine, and N-isopropylpiperidine; In S5, the molar ratio of the catalyst to the compound containing bisphenol hydroxyl groups is (0.002-0.004):1; And / or, the base in S5 is an alkali metal hydroxide; The concentration of alkali solution in S5 is 10wt%-50wt%.

14. The method according to claim 13, characterized in that, The alkali in S5 is sodium hydroxide and / or potassium hydroxide; The concentration of alkali solution in S5 is 25wt%-35wt%.

15. The method according to claim 1, characterized in that, The cleaning described in S6 is acid washing and water washing; And / or, in S6, the solid product e contains less than 1 ppm of catalyst, less than 20 ppm of chloride ions, and less than 200 ppm of oily solvent.

16. The method according to claim 15, characterized in that, Strong acid is used for pickling in S6; During pickling in S6, the mass ratio of acid to oil phase is (0.1-0.5):

1.

17. The method according to claim 1, characterized in that, The mold temperature in S7 is 240℃-360℃, and the holding time is 10min-180min.

18. A scratch-healing polycarbonate, said polycarbonate being prepared by any one of claims 1-17.

19. Use of a scratch-resistant self-healing polycarbonate, wherein the polycarbonate is a polycarbonate prepared by the method of any one of claims 1-17, or is the polycarbonate of claim 18, wherein the polycarbonate is used in polycarbonate articles requiring scratch resistance and self-healing properties.

20. The use according to claim 19, characterized in that, The polycarbonate is used in polycarbonate products for electronic products, automotive interiors, and optical lighting.

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