Fluorescent PC / ABS alloy and preparation method thereof

Abstract

The invention discloses a fluorescent PC / ABS alloy and a preparation method thereof. The fluorescent PC / ABS alloy comprises polycarbonate, fluorescent ABS and a processing aid. The preparation method comprises the following steps: preparing a fluorescent monomer 8-allyloxy-1, 3, 6-pyrene trisulfonic acid trisodium salt by a Williamson ether synthesis method, introducing the fluorescent monomer 8-allyloxy-1, 3, 6-pyrene trisulfonic acid trisodium salt into a molecular chain of an ABS alloy through copolymerization, and blending and extruding with polycarbonate and a processing aid to obtain the fluorescent PC / ABS alloy. The PC / ABS alloy synthesized by the invention is stable in fluorescence property, is not easy to separate out, and does not pollute the environment or cause harm to a human body. The addition of the fluorescent monomer endows the PC / ABS alloy with very strong fluorescence characteristics, and the PC / ABS alloy can be used for workpiece defect detection, fluorescent flaw detection and the like.

Description

Technical Field

[0001] The present invention belongs to the field of polymer fluorescent materials, and in particular relates to a fluorescent PC / ABS alloy and a preparation method thereof. Background Art

[0002] PC / ABS alloy, a mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer, is an important engineering plastic alloy. It overcomes the shortcomings of both resins while leveraging their respective strengths, combining the processing fluidity and formability of ABS with the mechanical properties, impact resistance, and temperature resistance of PC. It is widely used in the automotive, home appliance, aerospace, and medical equipment industries. However, there are few reports on the research and application of PC / ABS alloys as fluorescent materials.

[0003] Patent CN103557457A introduces a fluorescent LED lamp. Specifically, the fluorescent powder is attached to a PC cover. However, the fluorescent powder easily falls off and precipitates, polluting the environment and posing a threat to the human body. Patent CN112480633A introduces a fluorescent PC / ABS resin. Its specific preparation method involves adding fluorescent powder and luminous powder to polycarbonate and ABS resin, followed by blending, extrusion, drying, and pelletizing. However, the fluorescent powder in this fluorescent PC / ABS resin is dispersed through physical mixing, resulting in uneven distribution of the phosphor at various locations and an unstable structure. External environmental factors such as temperature and pH significantly affect the fluorescence intensity, making it difficult to maintain a high fluorescence intensity over the long term.

[0004] Therefore, it is necessary to develop a fluorescent PC / ABS alloy that is fluorescent stable and environmentally friendly to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to provide a fluorescent PC / ABS alloy and a preparation method thereof. The PC / ABS alloy of the present invention has stable fluorescent properties, high fluorescence intensity and uniform distribution, a stable fluorescent molecular structure that is not easy to precipitate, and will not cause pollution to the environment.

[0006] In order to achieve the above object of the invention, the technical solution adopted by the present invention is as follows:

[0007] A fluorescent PC / ABS alloy comprises the following raw materials in parts by weight:

[0008] 15-85 parts by weight of polycarbonate;

[0009] 10-80 parts by weight of fluorescent ABS;

[0010] 0-10 parts by weight of a processing aid;

[0011] Preferably, the polycarbonate is one or more of aromatic polycarbonate and aliphatic polycarbonate.

[0012] Preferably, the fluorescent ABS is a copolymer of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate and acrylonitrile, styrene and butadiene.

[0013] Preferably, the preparation method of the fluorescent ABS is:

[0014] A) adding styrene, trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, emulsifier A, molecular weight regulator, initiator A, and water into a reactor and mixing them uniformly, then introducing butadiene at a reaction temperature to react and obtain a fluorescent styrene-butadiene latex;

[0015] B) mixing fluorescent styrene-butadiene latex, emulsifier B, and water uniformly; then adding styrene, acrylonitrile, and initiator B to react; and separating to obtain fluorescent ABS.

[0016] Preferably, the trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate is obtained by reacting trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate and allyl chloride in the presence of a base.

[0017] Preferably, the base includes one or more of sodium hydroxide, potassium hydroxide, and sodium bicarbonate.

[0018] Preferably, the molar ratio of trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate to allyl chloride is 1:1.5-5.

[0019] Preferably, the molar ratio of trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate to the base is 1:1.5-2.5.

[0020] Preferably, the reaction temperature of trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate and allyl chloride is 50-80° C., and the reaction time is 4-10 h.

[0021] In some preferred embodiments of the present invention, the preparation method of the trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate is as follows: adding trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate and a base to a reactor, adding deionized water, stirring for 20-40 minutes to fully dissolve it; raising the temperature to 50-80°C, slowly adding allyl chloride dropwise, and simultaneously introducing condensed water, condensing and refluxing, after the dropwise addition is completed, continuing to react under magnetic stirring for 4-10 hours, and cooling to room temperature; then, removing water and allyl chloride from the product by vacuum rotary evaporation, and drying in a vacuum oven at 60-100°C to obtain the fluorescent monomer trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate;

[0022] The reaction route is shown below:

[0023]

[0024] Preferably, in step A), the mass ratio of styrene, trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, emulsifier A, molecular weight regulator, initiator A, and water is 10-40: 0.001-0.01: 1-5: 0.1-0.5: 0.1-1: 80-100.

[0025] Preferably, in step A), the mass ratio of styrene to butadiene is 10-40:60-80.

[0026] Preferably, in step A) and step B), the emulsifier A and emulsifier B are the same or different and are selected from one or more of anionic emulsifiers, cationic emulsifiers and nonionic emulsifiers, preferably one or more of potassium disproportionate rosinate, sodium rosinate soap, oleic acid soap and stearic acid soap.

[0027] Preferably, in step A), the molecular weight regulator is C4-C 20 of alkyl mercaptans.

[0028] Preferably, in step A) and step B), the initiator A is one or more of persulfate, azo compound, and organic peroxide.

[0029] Preferably, in step A), the reaction temperature is 50-80° C. and the reaction time is 6-10 h.

[0030] The reaction formula of step A) is as follows:

[0031]

[0032] Preferably, in step B), the mass ratio of fluorescent styrene-butadiene latex, emulsifier B, water, styrene, acrylonitrile and initiator B is 40-60:1-5:80-100:10-40:5-25:0.1-1.

[0033] Preferably, in step B), the reaction temperature is 50-80° C. and the reaction time is 2-6 h;

[0034] Preferably, in step B), after the reaction is completed, the emulsion is poured into a magnesium sulfate solution to break the emulsion, washed, filtered, and then dried at 60-100° C. to obtain fluorescent ABS.

[0035] The reaction equation of step B) is as follows:

[0036]

[0037] Preferably, the processing aids include one or more of antioxidants, toughening agents, lubricants, ultraviolet absorbers, flame retardants, compatibilizers, light stabilizers, heat stabilizers, metal deactivators, plasticizers, anti-sticking agents, colorants, coupling agents, nucleating agents, foaming agents, antibacterial agents, mildew inhibitors, acid scavengers, hydrolysis resistance agents, chain extenders, flow modifiers, matting agents, antistatic agents, reinforcing agents, fillers, anti-fogging agents, light diffusers, infrared absorbers, fluorescent brighteners and laser marking agents;

[0038] Preferably, the antioxidant is one or more of phenols, amines, phosphites, and thioesters.

[0039] Preferably, the toughening agent is one or more of methyl methacrylate-butadiene-styrene copolymer (MBS), silicone, and acrylate toughening agents.

[0040] The present invention also provides a preparation method of the fluorescent PC / ABS alloy, comprising the following steps: blending and extruding polycarbonate, fluorescent ABS, and a processing aid in a twin-screw extruder, and obtaining the fluorescent PC / ABS alloy after cooling, drying, and pelletizing.

[0041] Preferably, the melting temperature is 200-250° C. and the pelletizing length is 2-10 mm.

[0042] The positive effects of the present invention are:

[0043] The present invention prepares fluorescent ABS through a series of reactions, which is then blended with polycarbonate and a processing aid and extruded to produce a fluorescent PC / ABS alloy. In the synthesized PC / ABS alloy, the fluorescent molecules are linked to the ABS via stable chemical bonds, resulting in uniform distribution and resistance to precipitation, thus preventing environmental pollution or harm to the human body. Furthermore, the synthesized fluorescent molecules possess excellent fluorescence properties, imparting a high fluorescence intensity to the PC / ABS alloy, making it suitable for defect detection in manufactured parts and fluorescent flaw detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The fluorescence spectra of the alloy materials of the embodiment of the present invention and the comparative example are shown.

[0045] Figure 2 These are the fluorescence spectra of the alloy materials of Example 1 and Comparative Example 2 of the present invention after being placed for 180 days. DETAILED DESCRIPTION

[0046] For better understanding and implementation, the present invention is further described below in conjunction with examples, but the present invention is not limited to the listed examples, and also includes any other known changes within the scope of the rights claimed by the present invention.

[0047] Source of raw materials:

[0048] Trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate: analytical grade, produced by Tianjin Kaimart Chemical Technology Co., Ltd.

[0049] Sodium hydroxide: analytical grade, produced by Tianjin Kaimart Chemical Technology Co., Ltd.

[0050] Allyl chloride: purity 99%, produced by Shanghai Aladdin Biochemical Technology Co., Ltd.

[0051] Styrene: analytical grade, produced by Sinopharm Chemical Reagent Co., Ltd.

[0052] Butadiene: analytical grade, produced by Sinopharm Chemical Reagent Co., Ltd.

[0053] Acrylonitrile: analytical grade, produced by Sinopharm Chemical Reagent Co., Ltd.

[0054] Potassium disproportionate rosinate: industrial grade, produced by Guangxi Wuzhou Rosin Factory.

[0055] Tert-dodecyl mercaptan: analytical grade, produced by Chengdu Kelon Reagent Factory.

[0056] Potassium persulfate: analytical grade, produced by Laiyang Chemical Experimental Plant.

[0057] Cumene hydroperoxide: analytical grade, produced by Sinopharm Chemical Reagent Co., Ltd.

[0058] Polycarbonate: Bisphenol A polycarbonate produced by the interfacial phosgene method, produced by Wanhua Chemical Group Co., Ltd.

[0059] 8391: High gloss, high fluidity ABS, produced by Sinopec Shanghai Gaoqiao Petrochemical Co., Ltd.

[0060] M711: Industrial grade, produced by Kaneka Chemical Co., Ltd. of Japan.

[0061] 1010: Analytically pure, produced by Tianjin Lianlong New Materials Co., Ltd.

[0062] Example 1

[0063] The preparation process of fluorescent ABS is as follows:

[0064] In the first step, the fluorescent monomer 8-allyloxy-1,3,6-pyrenetrisulfonic acid trisodium was prepared by the Williamson ether synthesis method: 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium and sodium hydroxide were added in a molar ratio of 1:2 in a four-necked flask equipped with a reflux condenser, deionized water was added, a magnetic rotor was placed, and a magnetic stirrer was used to stir for 30 minutes to fully dissolve it; the temperature was raised to 70°C, and allyl chloride was slowly added dropwise using a dropping funnel, while condensed water was introduced. The molar ratio of 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium to allyl chloride was 1:3; after the addition was completed, the reaction was continued under magnetic stirring for 8 hours and then cooled to room temperature; then the water and allyl chloride in the product were removed by reduced pressure rotary evaporation using a rotary evaporator, and the product was dried in a vacuum oven at 80°C to obtain the fluorescent monomer 8-allyloxy-1,3,6-pyrenetrisulfonic acid trisodium with a product yield of 83%.

[0065] The second step is to prepare fluorescent styrene butadiene latex by free radical emulsion polymerization: 30 parts by mass of styrene, 0.005 parts by mass of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, 3 parts by mass of potassium disproportionate rosin acid, 0.3 parts by mass of tert-dodecyl mercaptan, 0.5 parts by mass of potassium persulfate, and 80 parts by mass of deionized water are added into a high-pressure polymerization reactor, mixed evenly, and heated to 70°C; then nitrogen is introduced for replacement, the butadiene storage tank is connected to the reactor through a pipeline, and 60 parts by mass of butadiene are slowly added and reacted for 8 hours to obtain fluorescent styrene butadiene latex.

[0066] The third step is to prepare fluorescent ABS by graft copolymerization: 60 parts by mass of fluorescent styrene-butadiene latex, 3 parts by mass of potassium disproportionate rosin acid, and 80 parts by mass of deionized water are added to a four-necked flask and mixed evenly; then 20 parts by mass of styrene, 10 parts by mass of acrylonitrile, and 0.5 parts by mass of initiator isopropyl benzene hydroperoxide (CHP) are added, and the reaction is carried out at 70°C for 4 hours; after cooling, the emulsion is poured into a 2% magnesium sulfate solution to break the emulsion. After washing and filtering, the emulsion is dried in a vacuum oven at 80°C to obtain fluorescent ABS.

[0067] Prepare the materials according to the following formula, with the following component contents:

[0068] 85 parts by weight of polycarbonate;

[0069] 10 parts by weight of fluorescent ABS;

[0070] 4.9 parts by weight of toughening agent M711;

[0071] 0.1 parts by weight of antioxidant 1010;

[0072] Polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0073] Example 2

[0074] The preparation process of fluorescent ABS is as follows:

[0075] The first step is the same as in Example 1.

[0076] The second step is to prepare fluorescent styrene butadiene latex by free radical emulsion polymerization: 30 parts by mass of styrene, 0.01 parts by mass of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, 3 parts by mass of potassium disproportionate rosin acid, 0.3 parts by mass of tert-dodecyl mercaptan, 0.5 parts by mass of potassium persulfate, and 90 parts by mass of deionized water are added into a high-pressure polymerization reactor, mixed evenly, and heated to 70°C; then nitrogen is introduced for replacement, the butadiene storage tank is connected to the reactor through a pipeline, and 70 parts by mass of butadiene is slowly added and reacted for 8 hours to obtain fluorescent styrene butadiene latex.

[0077] The third step is the same as Example 1 except that the mass of the fluorescent styrene-butadiene latex is replaced by 40 parts by mass.

[0078] Prepare the materials according to the following formula, with the following component contents:

[0079] 85 parts by weight of polycarbonate;

[0080] 10 parts by weight of fluorescent ABS;

[0081] 4.9 parts by weight of toughening agent M711;

[0082] 0.1 parts by weight of antioxidant 1010;

[0083] Polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0084] Example 3

[0085] The preparation process of fluorescent ABS is as follows:

[0086] The first step is the same as in Example 1.

[0087] The second step is to prepare fluorescent styrene butadiene latex by free radical emulsion polymerization: 30 parts by mass of styrene, 0.015 parts by mass of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, 3 parts by mass of potassium disproportionate rosin acid, 0.3 parts by mass of tert-dodecyl mercaptan, 0.5 parts by mass of potassium persulfate, and 80 parts by mass of deionized water are added into a high-pressure polymerization reactor, mixed evenly, and heated to 70°C; then nitrogen is introduced for replacement, the butadiene storage tank is connected to the reactor through a pipeline, and 80 parts by mass of butadiene is slowly added and reacted for 8 hours to obtain fluorescent styrene butadiene latex.

[0088] In the third step, the same procedures as in Example 1 were followed except that the mass of styrene was replaced by 35 parts by mass and the mass of acrylonitrile was replaced by 25 parts by mass.

[0089] Prepare the materials according to the following formula, with the following component contents:

[0090] 85 parts by weight of polycarbonate;

[0091] 10 parts by weight of fluorescent ABS;

[0092] 4.9 parts by weight of toughening agent M711;

[0093] 0.1 parts by weight of antioxidant 1010;

[0094] Polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0095] Example 4

[0096] The preparation process of fluorescent ABS is the same as that in Example 1.

[0097] Prepare the materials according to the following formula, with the following component contents:

[0098] 65 parts by weight of polycarbonate;

[0099] 30 parts by weight of fluorescent ABS;

[0100] 4.9 parts by weight of toughening agent M711;

[0101] 0.1 parts by weight of antioxidant 1010; polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250°C, and the pellet length is 2-10 mm.

[0102] Example 5

[0103] The preparation process of fluorescent ABS is the same as that in Example 1.

[0104] Prepare the materials according to the following formula, with the following component contents:

[0105] 45 parts by weight of polycarbonate;

[0106] 50 parts by weight of fluorescent ABS;

[0107] 4.9 parts by weight of toughening agent M711;

[0108] 0.1 parts by weight of antioxidant 1010;

[0109] Polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0110] Example 6

[0111] The preparation process of fluorescent ABS is the same as that in Example 1.

[0112] Prepare the materials according to the following formula, with the following component contents:

[0113] 25 parts by weight of polycarbonate;

[0114] 70 parts by weight of fluorescent ABS;

[0115] 4.9 parts by weight of toughening agent M711;

[0116] 0.1 parts by weight of antioxidant 1010;

[0117] Polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0118] Example 7

[0119] The preparation process of fluorescent ABS is the same as that in Example 1.

[0120] Prepare the materials according to the following formula, with the following component contents:

[0121] 15 parts by weight of polycarbonate;

[0122] 80 parts by weight of fluorescent ABS;

[0123] 4.9 parts by weight of toughening agent M711;

[0124] 0.1 parts by weight of antioxidant 1010;

[0125] Polycarbonate, fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a fluorescent PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0126] Comparative Example 1

[0127] The preparation process of non-fluorescent ABS is as follows:

[0128] The first step is to prepare styrene butadiene latex by free radical emulsion polymerization: 30 parts by mass of styrene, 3 parts by mass of potassium disproportionate rosin acid, 0.3 parts by mass of tert-dodecyl mercaptan, 0.5 parts by mass of potassium persulfate, and 80 parts by mass of deionized water are added to a high-pressure polymerization reactor, mixed evenly, and heated to 70°C; then nitrogen is introduced for replacement, the butadiene storage tank is connected to the reactor through a pipeline, and 60 parts by mass of butadiene is slowly added and reacted for 8 hours to obtain styrene butadiene latex.

[0129] The second step is to prepare non-fluorescent ABS by graft copolymerization: 60 parts by mass of styrene-butadiene latex, 3 parts by mass of potassium disproportionate rosinate, and 80 parts by mass of deionized water are added to a four-necked flask and mixed evenly; then 20 parts by mass of styrene, 10 parts by mass of acrylonitrile, and 0.5 parts by mass of initiator isopropylbenzene hydroperoxide (CHP) are added, and the reaction is carried out at 70°C for 4 hours; after cooling, the emulsion is poured into a 2% magnesium sulfate solution to break the emulsion. After washing and filtering, the emulsion is dried in a vacuum oven at 80°C to obtain non-fluorescent ABS.

[0130] Prepare the materials according to the following formula, with the following component contents:

[0131] 85 parts by weight of polycarbonate;

[0132] 10 parts by weight of non-fluorescent ABS;

[0133] 4.9 parts by weight of toughening agent M711;

[0134] 0.1 parts by weight of antioxidant 1010;

[0135] Polycarbonate, non-fluorescent ABS, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a PC / ABS alloy. The melting temperature is 200-250° C., and the pelletizing length is 2-10 mm.

[0136] Comparative Example 2

[0137] The preparation process of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate is as follows:

[0138] In a four-necked flask equipped with a reflux condenser, 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium and sodium hydroxide in a molar ratio of 1:2 were added, deionized water was added, a magnetic rotor was placed, and a magnetic stirrer was used to stir for 30 minutes to fully dissolve it; the temperature was raised to 70°C, and allyl chloride was slowly added dropwise using a dropping funnel, while condensed water was introduced, and the molar ratio of 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium to allyl chloride was 1:3; after the addition was completed, the reaction was continued under magnetic stirring for 8 hours and cooled to room temperature; then the water and allyl chloride in the product were removed by reduced pressure rotary evaporation using a rotary evaporator, and the product was dried in a vacuum oven at 80°C to obtain the fluorescent monomer 8-allyloxy-1,3,6-pyrenetrisulfonic acid trisodium, and the product yield was 83%.

[0139] Prepare the materials according to the following formula, with the following component contents:

[0140] 85 parts by weight of polycarbonate;

[0141] 10 parts by weight of 8391;

[0142] 0.00037 parts by weight of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate;

[0143] 4.9 parts by weight of toughening agent M711;

[0144] 0.1 parts by weight of antioxidant 1010;

[0145] Polycarbonate, 8391, trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, M711, and 1010 are blended and extruded in a twin-screw extruder, and then cooled, dried, and pelletized to obtain a PC / ABS alloy. The melting temperature is 200-250° C., and the pellet length is 2-10 mm.

[0146] The PC / ABS alloy particles obtained in Examples 1 to 7 and Comparative Examples 1 to 2 were respectively injection-molded into articles, and the fluorescence on the surface was detected using a fluorescence spectrophotometer. The fluorescence spectrum was as shown in FIG. Figure 1 As shown. It can be seen that under the same conditions, the fluorescence intensity of Comparative Example 1 is zero. Comparative Example 2 uses the same amount of 8-allyloxy-1,3,6-pyrenetrisulfonic acid trisodium as Example 1, but the fluorescence intensity is much lower than that of Example 1. The PC / ABS alloys prepared in Examples 1 to 7 have strong fluorescence properties and can emit blue fluorescence with a wavelength of about 418nm. Therefore, they can be used for part defect detection, fluorescent flaw detection, etc. In addition, as the content of 8-allyloxy-1,3,6-pyrenetrisulfonic acid trisodium and fluorescent ABS in the examples increases, the fluorescence intensity of the resulting PC / ABS alloy continues to increase, showing aggregation-induced emission (AIE).

[0147] The PC / ABS alloy particles obtained in Example 1 and Comparative Example 2 were respectively injection-molded into articles, which were placed in a natural environment for 180 days. The fluorescence at three different positions on the surface of the articles was detected using a fluorescence spectrophotometer. The fluorescence spectra were as shown in FIG. Figure 2 As shown in the figure, after 180 days of storage, the fluorescence intensity at different locations in Example 1 is not much different, indicating that the fluorescent molecules have basically not precipitated. The fluorescence intensity decreases slightly, which is a normal phenomenon of fluorescence intensity decaying over time. However, the fluorescence intensity at different locations in Comparative Example 2 varies greatly, with some fluorescence intensities being too high or too low, indicating that the fluorescent molecules have clearly precipitated. Therefore, compared to directly physically mixing fluorescent molecules with PC and ABS, fluorescent molecules bonded to ABS through stable chemical bonds have the advantages of uniform distribution and low precipitation, thus preventing environmental pollution or harm to the human body.

[0148] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments and that various modifications and improvements are possible without departing from the spirit and scope of the present invention, and that such modifications and improvements fall within the scope of the present invention as claimed. The scope of the present invention is defined by the appended claims.

Claims

1. A fluorescent PC / ABS alloy, characterized in that: Contains the following raw materials in parts by weight: 15-85 parts by weight of polycarbonate; 10-80 parts by weight of fluorescent ABS; 0-10 parts by weight of processing aids.

2. The fluorescent PC / ABS alloy according to claim 1, characterized in that: The fluorescent ABS is a copolymer of trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, acrylonitrile, styrene and butadiene.

3. The fluorescent PC / ABS alloy according to claim 1 or 2, characterized in that: The preparation method of the fluorescent ABS is as follows: A) adding styrene, trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, emulsifier A, molecular weight regulator, initiator A, and water into a reactor and mixing them uniformly, then introducing butadiene at a reaction temperature to react and obtain a fluorescent styrene-butadiene latex; B) mixing fluorescent styrene-butadiene latex, emulsifier B, and water uniformly; then adding styrene, acrylonitrile, and initiator B to react, and separating to obtain fluorescent ABS.

4. The fluorescent PC / ABS alloy according to claim 3, characterized in that: The trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate is obtained by reacting trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate and allyl chloride in the presence of a base; Preferably, the base comprises one or more of sodium hydroxide, potassium hydroxide, and sodium bicarbonate; Preferably, the molar ratio of trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate to allyl chloride is 1:1.5-5; Preferably, the molar ratio of trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate to base is 1:1.5-2.5; Preferably, the reaction temperature of trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate and allyl chloride is 50-80° C., and the reaction time is 4-10 h; Preferably, the preparation method of the trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate is as follows: adding trisodium 8-hydroxy-1,3,6-pyrenetrisulfonate and a base to a reactor, adding deionized water, stirring for 20-40 minutes to fully dissolve it; raising the temperature to 50-80°C, slowly adding allyl chloride dropwise, and simultaneously introducing condensed water, condensing and refluxing, after the dropwise addition is completed, continuing to react under magnetic stirring for 4-10 hours, and cooling to room temperature; then removing water and allyl chloride from the product by vacuum rotary evaporation, and drying in a vacuum oven at 60-100°C to obtain trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate.

5. The fluorescent PC / ABS alloy according to claim 3, characterized in that: In step A), the mass ratio of styrene, trisodium 8-allyloxy-1,3,6-pyrenetrisulfonate, emulsifier A, molecular weight regulator, initiator A, and water is 10-40: 0.001-0.01：1-5：0.1-0.5：0.1-1：80-100； Preferably, in step A), the mass ratio of styrene to butadiene is 10-40:60-80; Preferably, in step A) and step B), the emulsifier A and the emulsifier B are the same or different and are selected from one or more of anionic emulsifiers, cationic emulsifiers and nonionic emulsifiers, preferably one or more of potassium disproportionate rosinate, sodium rosinate soap, oleic acid soap and stearic acid soap; Preferably, in step A), the molecular weight regulator is C4-C 20 Alkyl mercaptan; Preferably, in step A) and step B), the initiator A is one or more of persulfate, azo compound, and organic peroxide; Preferably, in step A), the reaction temperature is 50-80° C. and the reaction time is 6-10 h.

6. The fluorescent PC / ABS alloy according to claim 3, characterized in that: In step B), the mass ratio of fluorescent styrene-butadiene latex, emulsifier B, water, styrene, acrylonitrile, and initiator B is 40-60:1-5:80-100:10-40:5-25:0.1-1; Preferably, in step B), the reaction temperature is 50-80° C. and the reaction time is 2-6 h; Preferably, in step B), after the reaction is completed, the emulsion is poured into a magnesium sulfate solution to break the emulsion, washed, filtered, and then dried at 60-100° C. to obtain fluorescent ABS.

7. The fluorescent PC / ABS alloy according to claim 1, characterized in that: The polycarbonate is one or more of aromatic polycarbonate and aliphatic polycarbonate; Preferably, the processing aids include one or more of antioxidants, toughening agents, lubricants, ultraviolet absorbers, flame retardants, compatibilizers, light stabilizers, heat stabilizers, metal deactivators, plasticizers, anti-sticking agents, colorants, coupling agents, nucleating agents, foaming agents, antibacterial agents, mildew inhibitors, acid scavengers, hydrolysis resistance agents, chain extenders, flow modifiers, matting agents, antistatic agents, reinforcing agents, fillers, anti-fogging agents, light diffusers, infrared absorbers, fluorescent brighteners and laser marking agents; Preferably, the antioxidant is one or more of phenols, amines, phosphites, and thioesters; Preferably, the toughening agent is one or more of methyl methacrylate-butadiene-styrene copolymer, silicone, and acrylate toughening agents.

8. A method for preparing the fluorescent PC / ABS alloy according to any one of claims 1 to 7, comprising the following steps: Polycarbonate, fluorescent ABS and processing aids are blended and extruded in a twin-screw extruder, and then cooled, dried and pelletized to obtain a fluorescent PC / ABS alloy; Preferably, the melting temperature is 200-250° C. and the pelletizing length is 2-10 mm.

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