CN112226034B

CN112226034B - PC/ABS alloy material and preparation method thereof

Info

Publication number: CN112226034B
Application number: CN201910633213.0A
Authority: CN
Inventors: 张钊; 吴雪峰; 王亚辉; 邢津铭; 王栋; 徐丹
Original assignee: Wanhua Chemical Group Co Ltd; Wanhua Chemical Ningbo Co Ltd
Current assignee: Wanhua Chemical Group Co Ltd; Wanhua Chemical Ningbo Co Ltd
Priority date: 2019-07-15
Filing date: 2019-07-15
Publication date: 2022-04-22
Anticipated expiration: 2039-07-15
Also published as: CN112226034A

Abstract

The invention provides a PC/ABS alloy material and a preparation method thereof, wherein the alloy material comprises 20-70 parts by weight of Polycarbonate (PC), 20-70 parts by weight of styrene-butadiene-acrylonitrile copolymer (ABS) and 0.1-15 parts by weight of sliding graft polymer; the preparation method is to extrude and granulate through an extruder and then to inject and form. Wherein the structure of the sliding graft polymer is as follows: the cyclic molecule grafted with polycaprolactone is inserted on the main chain of polyethylene glycol. The sliding graft polymer is added into a PC/ABS system, so that the etching area of the alloy material can be increased, the electroplating binding force is improved, and the polymer has good compatibility with PC/ABS and can play a role in compatibilization and toughening.

Description

PC/ABS alloy material and preparation method thereof

The technical field is as follows:

the invention belongs to the field of polymer composite materials, and relates to a PC/ABS alloy material and a preparation method thereof.

Background art:

the electroplating PC/ABS material has the high heat resistance and impact strength of PC and the low internal stress and electroplatable performance of ABS. When the pure ABS is applied to the electroplating field, the defects of insufficient heat resistance and strength exist, and the PC material has the defects of large internal stress and incapability of electroplating. After the two are combined, good comprehensive performance is obtained, and the alloy has good application value in the field of non-metal electroplating, especially on automobile electroplated parts.

The problems of the existing electroplating PC/ABS material are that PC can not be electroplated, the electroplating performance is reduced after the PC/ABS is blended with ABS, and the electroplating binding force and the surface condition after electroplating are poor. After actual processing, the problems of low electroplating yield and low electroplating binding force are faced. Therefore, the formula and process optimization are urgently needed to improve the electroplating performance of the PC/ABS alloy material, mainly reflect the electroplating qualification rate, the electroplating binding force, the surface condition after electroplating and the like, and expand the application in the field of non-metal electroplating.

For example, the material prepared by the method of chinese invention patent CN 103059547B "an electroplating PC/ABS alloy material and its preparation method" adds butadiene graft material and heat-resistant modifier to PC/ABS, and the prepared electroplating PC/ABS alloy material has no effective evaluation of its electroplating performance, and cannot determine whether the method will improve the electroplating qualification rate and electroplating bonding force of the product. The material prepared by the 'electroplating PC/ABS alloy and the preparation method thereof' in the Chinese invention patent CN 102367327B simplifies the electroplating process by adding the conductive agent into the PC/ABS, but the conductive agent can generate adverse effect on the impact strength of the material and directly influence the practical application.

The invention creatively adds the sliding graft polymer to the PC/ABS system, on one hand, the hydroxyl on the surface of the sliding graft polymer can act with a matrix and slide towards the surface of the matrix, and the components on the surface fall off when being etched by strong acid, thereby increasing the etching area and improving the electroplating binding force, and on the other hand, the polymer has good compatibility with the PC/ABS and can play a role in compatibilization and toughening.

The invention content is as follows:

the PC/ABS material prepared by the invention has the advantages of excellent electroplating performance and good comprehensive performance, and has good application value in the field of electroplating PC/ABS materials.

The formula of the PC/ABS material prepared by the invention comprises the following components:

20-70 parts by weight of polycarbonate,

20-70 parts of styrene-butadiene-acrylonitrile copolymer,

0.1 to 15 parts by weight of a sliding graft polymer,

wherein the total of the polycarbonate, the styrene-butadiene-acrylonitrile copolymer and the sliding graft polymer is 100 parts by weight.

Preferably, the composition of the present invention comprises the following components

25-65 parts by weight of polycarbonate,

25 to 65 parts by weight of styrene-butadiene-acrylonitrile copolymer,

0.3 to 12 parts by weight of a sliding graft polymer,

More preferably, the composition of the invention comprises the following constituents:

30-60 parts by weight of polycarbonate,

30-60 parts of styrene-butadiene-acrylonitrile copolymer,

0.5 to 10 parts by weight of a sliding graft polymer,

In the present invention, optional additives may be optionally added in an amount of 0 to 5 wt%, preferably 0.1 to 4 wt%, and more preferably 0.5 to 3 wt% based on the total weight of the alloy material.

In the present invention, the polycarbonate is one or more of aromatic polycarbonate, aliphatic polycarbonate and aromatic-aliphatic polycarbonate, and bisphenol a polycarbonate is preferred. The melt flow index of the polycarbonate is between 3 and 65g/10min, preferably between 5 and 50g/10min, more preferably between 7 and 35g/10min at 1.2kg at 300 ℃.

In the present invention, the styrene-butadiene-acrylonitrile copolymer (ABS) contains 15 to 50 wt.% of butadiene monomer units, 15 to 35 wt.% of acrylonitrile monomer units, and 30 to 70 wt.% of styrene monomer units; preferably, the styrene-butadiene-acrylonitrile copolymer contains 18 to 40 wt.% of butadiene monomer units, 20 to 30 wt.% of acrylonitrile monomer units, and 35 to 60 wt.% of styrene monomer units.

In the invention, the preparation method of the styrene-butadiene-acrylonitrile copolymer is a bulk method or an emulsion blending method.

In the invention, the sliding graft polymer is a network structure obtained by inserting annular cyclodextrin molecules on main chain polyethylene glycol, grafting polycaprolactone onto the cyclodextrin and carrying out a crosslinking reaction.

In the invention, the optional additive is selected from one or more of flame retardant, toughening agent, compatibilizer, antioxidant, lubricant, ultraviolet absorbent, light stabilizer, heat stabilizer, metal deactivator, plasticizer, anti-sticking agent, coloring agent, coupling agent, nucleating agent, foaming agent, antibacterial agent, mildew preventive, acid scavenger, hydrolysis resistance agent, chain extender, flow modifier, delustering agent, antistatic agent, reinforcing agent, filler, antifogging agent, light diffusant, infrared absorbent, fluorescent brightener, laser marking agent and other additives.

In the invention, the compatibilizer is preferably one or a combination of LG chemical EM500, Akoma E920, easy SBG, easy SAG and Koton KT-2.

In the invention, the antioxidant is one or the combination of two or more of hindered phenols, phosphites, thioesters, benzofurans, acryloyl modified phenols and hydroxylamines. Preferably, one or more of oxidation resistant Irganox 1076, Irganox 1010, Irganox 168, Irgafos 126, and Irgafos P-EPQ from BASF corporation are used.

In the invention, the lubricant is one or more of fatty alcohols, metal soaps, fatty acids, fatty acid esters, montanic acid and derivatives thereof, amide waxes, saturated hydrocarbons, polyolefin waxes and derivatives thereof, organic silicon and silicone powder, organic fluorine and the like. Ester lubricants such as PETS from the company FOYOU or LONGSHA are preferably used.

In the present invention, benzotriazole and triazine are preferably used as the ultraviolet absorber, such as Tinuvin 234, Tinuvin 360, Tinuvin 1577 and the like available from BASF.

In the invention, the flame retardant is one or a combination of halogen flame retardants such as tetrabromobisphenol A polycarbonate oligomers, tetrabromobisphenol A-bisphenol A copolycarbonates, low molecular organic bromides, silicon flame retardants, organic sulfonates and phosphorus flame retardants.

In the present invention, the anti-dripping agent is preferably Polytetrafluoroethylene (PTFE).

In the invention, the anti-sticking agent is one or a combination of synthetic silica gel, silicon dioxide, talc, zeolite, limestone and organic anti-sticking agent.

In the invention, the antibacterial agent is one or a combination of nano silver oxide and nano oxide.

In the present invention, the acid scavenger is preferably a metal stearate such as calcium stearate and zinc stearate.

In the invention, the filler is one or a combination of calcium carbonate, glass fiber, kaolin, silicon dioxide, talcum powder, montmorillonite, diatomite, carbon fiber, dolomite, magnesium carbonate, calcium sulfate, barium sulfate, glass microsphere, ceramic microsphere, natural silica, feldspar, aluminum hydroxide, magnesium hydroxide, carbon black, wood powder, talc, mica, clay, graphite, wollastonite, whisker and aramid fiber.

In the invention, the coupling agent is one or a combination of a silane coupling agent, a titanate coupling agent, a zirconate coupling agent and fatty acid.

In the invention, the heat stabilizer is one or a combination of organic phosphite, organic phosphate and phosphonate.

In the present invention, the fluorescent whitening agent is preferably a styrene system, such as styryl bisbenzoxazole from Sumitomo Chemicals.

The invention also provides a preparation method of the PC/ABS alloy material, which comprises the following steps:

the method comprises the following steps: adding PC, ABS, a sliding graft polymer and an optional additive into a double-screw extruder for extrusion granulation, controlling the temperature of a processing temperature zone to be 220-280 ℃, and controlling the rotating speed of a host machine to be 150-500 r/min;

step two: drying the extruded granules obtained in the step two at 70-100 ℃ for 3-4h to fully remove moisture;

step three: injection molding: keeping the mold clean, controlling the mold temperature at 60-90 ℃, the cylinder temperature at 220-280 ℃, the injection speed at 50-100mm/s and the injection pressure gauge pressure at 50-100 bar.

The invention has the advantages that: by adding PC, ABS, sliding graft polymer and the like, on one hand, hydroxyl on the surface of the sliding graft polymer can act with a matrix and slide towards the surface of the matrix, and components on the surface fall off during strong acid etching, so that the etching area is increased, the electroplating binding force is improved, and on the other hand, the polymer has good compatibility with PC/ABS and can play a role in compatibilization and toughening. The method is simple and easy to operate, has good effect, and has excellent effect when being applied to the field of electroplating PC/ABS!

The specific implementation mode is as follows:

the present invention may be understood more readily by reference to the following detailed description of the invention and the examples included therein. It should be noted that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.

The following examples and comparative examples used the following raw materials:

PC: polycarbonate Clarnate a1105(MFR 22g/10min, 300 ℃/1.2kg), manufactured by wawa chemical group ltd;

ABS-1: ABS pellets produced by blending, PA726M (butadiene content 20%, acrylonitrile content 20%, styrene 60%), Taiwan Chimei corporation;

ABS-2: bulk ABS, 8434 (butadiene content 14%, acrylonitrile content 24%, styrene 62%), manufactured by shanghai high bridge petrochemical company;

sliding graft polymer: s1000, production by Tianjin micro Rui supermolecule company Limited;

a toughening agent: MBS 2620, manufactured by Dow chemical company, USA;

antioxidant: synergistic antioxidant B900 and double bond chemical production;

lubricant: pentaerythritol stearate (PETS), manufactured by Longsha corporation, USA;

example 1

Comprises the following raw materials in parts by weight: PC: 20 parts of ABS-1: 70 parts, sliding graft polymer: 10 parts. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 220 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 70 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 60 ℃, the machine barrel temperature is controlled to be 220 ℃, the injection speed is 60mm/s, and the injection pressure is 60bar for injection molding.

Example 2

Comprises the following raw materials in parts by weight: PC: 30 parts, ABS-1: 60 parts, sliding graft polymer: 5 parts of toughening agent, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 230 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 80 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 70 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70bar for injection molding.

Example 3

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-1: 40 parts, sliding graft polymer: 15 parts of toughening agent, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 240 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is 80mm/s, and the injection pressure is 80bar for injection molding.

Example 4

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-1: 50 parts, sliding graft polymer: 5 parts of toughening agent, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 250 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 250 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70bar for injection molding.

Example 5

Comprises the following raw materials in parts by weight: PC: 50 parts of ABS-1: 45 parts, sliding graft polymer: 0.1 part, 4.4 parts of toughening agent, 0.2 part of antioxidant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 250 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 250 ℃, the injection speed is 80mm/s, and the injection pressure is 80bar for injection molding.

Example 6

Comprises the following raw materials in parts by weight: PC: 60 parts, ABS-1: 30 parts, sliding graft polymer: 7 parts of toughening agent 2.5 parts, antioxidant 0.2 part and lubricant 0.3 part. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 260 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 90 ℃, the machine barrel temperature is controlled to be 260 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70bar for injection molding.

Example 7

Comprises the following raw materials in parts by weight: PC: 70 parts of ABS-1: 20 parts, slip graft polymer: 5 parts of toughening agent, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 280 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 100 ℃, the machine barrel temperature is controlled to be 280 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70bar for injection molding.

Example 8

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-2: 50 parts, sliding graft polymer: 5 parts of toughening agent, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 240 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70bar for injection molding.

Example 9

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-1: 54 parts, sliding graft polymer: 3 parts, 2.5 parts of a toughening agent, 0.2 part of an antioxidant and 0.3 part of a lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 240 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70bar for injection molding.

Comparative example 1

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-1: 55 parts of flexibilizer, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 240 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70 bar.

Comparative example 2

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-2: 55 parts of flexibilizer, 4.5 parts of antioxidant, 0.2 part of lubricant and 0.3 part of lubricant. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 240 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70 bar.

Comparative example 3

Comprises the following raw materials in parts by weight: PC: 40 parts, ABS-1: 60 parts. Adding the materials into a high-speed mixer, mixing for 5min, adding into a double-screw extruder, extruding and granulating, controlling the temperature of a processing temperature zone to be 240 ℃, and controlling the rotating speed of a main machine to be 300 r/min. And after the extrusion is finished, drying for 4 hours at 90 ℃ to fully remove water and optimizing the injection molding process, wherein the mold temperature is controlled to be 80 ℃, the machine barrel temperature is controlled to be 240 ℃, the injection speed is controlled to be 70mm/s, and the injection pressure is controlled to be 70 bar.

The injection molded products of the PC/ABS materials prepared in the above examples and comparative examples are electroplated in a certain electroplating plant, and the electroplating process is completed after oil removal, water washing, swelling, coarsening, water washing, reduction, water washing, sensitization, activation, water washing, peptization, water washing, chemical nickel plating, pre-copper plating, water washing, nickel plating, chromium plating, water washing and drying. The various steps of the electroplating described above are conventional steps known in the art, and specific operating parameters are also known.

Table 1 shows the results of testing the properties of injection-molded articles of PC/ABS material prepared in each example and comparative example, wherein:

notched impact strength was measured according to ASTM D256 under 23 ℃ and with a tester of the type CEAST9050 pendulum impact tester.

The tensile strength was measured according to ASTM D638 under the test conditions of a tensile speed of 50mm/min and a test apparatus of a CMT4104-BZ microcomputer-controlled electronic universal tester available from MTS.

Heat deflection temperature was measured according to ASTM D648 under the conditions of a load of 1.82MPa, a temperature rise rate of 120 ℃/h and a test apparatus of HV6M Heat deflection and Vicat tester from Instron.

The electroplating binding force is measured according to the ASTM B533 standard under the condition that the tensile rate is 100mm/min, and the testing instrument is a CMT4104-BZ microcomputer controlled electronic universal testing machine of MTS company.

The surface condition after plating is judged by professional electroplating technicians and is divided into four grades of 'excellent, good, general and poor'.

Plating yield 100 samples of 140X 90X 3mm were plated in a plating factory and the yield was counted.

TABLE 1 table of properties of examples and comparative examples

For electroplating PC/ABS products, the most critical performance is electroplating performance which is mainly evaluated by electroplating bonding force, electroplating qualification rate, surface after electroplating and the like, wherein the electroplating qualification rate is the most important index. In actual production, the yield of electroplating is improved by only 10%, which represents considerable economic benefit for manufacturers.

According to the examples and the comparative examples, the PC/ABS alloy material prepared by adding PC, ABS, the sliding graft polymer and optional additives has excellent impact strength, high heat resistance and particularly excellent electroplating performance. As can be seen from the comparative examples, good plating properties and impact resistance were not obtained without adding the sliding graft polymer.

In conclusion, the PC/ABS alloy material disclosed by the invention has the advantages that by adding the PC, the ABS, the sliding graft polymer and the optional additives and optimizing the preparation process, the workpiece is high in electroplating binding force, the plated surface is excellent, the electroplating performance is excellent, the electroplating qualified rate is more than 98%, and the electroplating qualified rate is far higher than that of each comparative example.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.

Claims

1. The PC/ABS alloy material is characterized by comprising the following components:

20-70 parts by weight of polycarbonate,

20-70 parts of styrene-butadiene-acrylonitrile copolymer,

0.1 to 15 parts by weight of a sliding graft polymer,

wherein the total of the polycarbonate, the styrene-butadiene-acrylonitrile copolymer and the sliding graft polymer is 100 parts by weight;

the sliding graft polymer is a network structure obtained by inserting annular cyclodextrin molecules on main chain polyethylene glycol, grafting polycaprolactone onto the cyclodextrin and carrying out a crosslinking reaction.

2. The PC/ABS alloy material according to claim 1, comprising the following components:

25-65 parts by weight of polycarbonate,

25 to 65 parts by weight of styrene-butadiene-acrylonitrile copolymer,

0.3-12 parts by weight of a sliding graft polymer;

3. The PC/ABS alloy material according to claim 2, comprising the following components:

30-60 parts by weight of polycarbonate,

30-60 parts of styrene-butadiene-acrylonitrile copolymer,

0.5-10 parts by weight of a sliding graft polymer;

4. The PC/ABS alloy material according to claim 1, wherein the polycarbonate is one or more selected from aromatic polycarbonate, aliphatic polycarbonate, and aromatic-aliphatic polycarbonate, and the polycarbonate has a melt flow index MFR of 3 to 65g/10min at a load of 1.2kg under a test condition of 300 ℃.

5. The PC/ABS alloy material of claim 4, wherein the polycarbonate is bisphenol A polycarbonate.

6. The PC/ABS alloy material according to claim 4, wherein the melt flow index MFR of the polycarbonate is 5-50g/10min at a load of 1.2kg at 300 ℃.

7. The PC/ABS alloy material according to claim 6, wherein the melt flow index MFR of the polycarbonate is 7-35g/10min at a load of 1.2kg at 300 ℃.

8. The PC/ABS alloy material according to claim 1, characterized in that the styrene-butadiene-acrylonitrile copolymer contains 15-50 wt.% of butadiene monomer units, 15-35 wt.% of acrylonitrile monomer units and 30-70 wt.% of styrene monomer units.

9. The PC/ABS alloy material according to claim 1, characterized in that the styrene-butadiene-acrylonitrile copolymer contains 18-40 wt.% of butadiene monomer units, 20-30 wt.% of acrylonitrile monomer units and 35-60 wt.% of styrene monomer units.

10. The PC/ABS alloy material according to claim 1, wherein the styrene-butadiene-acrylonitrile copolymer is prepared by a bulk method or an emulsion blending method.

11. The PC/ABS alloy material according to claim 1, further comprising optional additives added in an amount of 0-5 wt% based on the total weight of the alloy material.

12. The PC/ABS alloy material according to claim 11, wherein the optional additives are added in an amount of 0.1-4 wt% based on the total weight of the alloy material.

13. The PC/ABS alloy material according to claim 12, wherein the optional additives are added in an amount of 0.5-3 wt% based on the total weight of the alloy material.

14. The PC/ABS alloy material of claim 11, wherein the optional additives are selected from the group consisting of flame retardants, tougheners, compatibilizers, antioxidants, lubricants, uv absorbers, light stabilizers, heat stabilizers, metal deactivators, plasticizers, antiblocking agents, colorants, coupling agents, nucleating agents, blowing agents, antibacterial agents, mildewcides, acid scavengers, hydrolysis inhibitors, chain extenders, flow modifiers, delusterants, antistatic agents, reinforcing agents, fillers, antifogging agents, light diffusers, infrared absorbers, optical brighteners, laser markers, and combinations of one or more thereof.

15. A method for preparing the PC/ABS alloy material according to any one of claims 1 to 14, comprising the steps of:

the method comprises the following steps: adding PC, ABS and the sliding graft polymer into a double-screw extruder for extrusion granulation, controlling the temperature of a processing temperature zone to be 220-;

step three: injection molding: the temperature of the control mold is 60-90 ℃, the temperature of a machine barrel is 220-280 ℃, the injection speed is 50-100mm/s, and the injection pressure is 50-100 bar.