CN111117196A

CN111117196A - A kind of PC/ABS alloy material with low odor and low emission and its preparation method and use

Info

Publication number: CN111117196A
Application number: CN202010003450.1A
Authority: CN
Inventors: 张振威; 陈连清; 陈晶斌; 李万庆; 高卫强
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: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-05-08
Anticipated expiration: 2040-01-02
Also published as: CN111117196B

Abstract

The invention provides a low-odor low-emission PC/ABS alloy material, and a preparation method and application thereof. The PC/ABS alloy material comprises the following raw material components by taking the total weight of polycarbonate resin, ABS resin, compatilizer and foaming polymer as 100 percent: 30-90% of polycarbonate resin, 5-60% of ABS resin, 0.5-10% of compatilizer and 0.1-10% of foaming polymer. The PC/ABS alloy material disclosed by the invention has the characteristics of low odor and low emission, and has excellent mechanical properties and good hydrolysis resistance.

Description

Low-odor low-emission PC/ABS alloy material and preparation method and application thereof

Technical Field

The invention belongs to the field of macromolecules, and particularly relates to a low-odor low-emission PC/ABS alloy material, and a preparation method and application thereof.

Background

The PC/ABS alloy material is one of general materials for automotive interior parts, such as instrument panel frameworks, auxiliary instrument panels, ceiling controllers, air-conditioning air outlets, demisting grilles, interior rearview mirrors and the like.

As the air quality safety in the automobile is more and more emphasized by people, the research and development of PC/ABS alloy materials with low VOC (volatile organic compounds) content and low odor are imperative.

Much research has been done on how to reduce the odor and VOC content of PC/ABS alloy materials. Such as: patent document CN101469122A discloses: a PC/ABS alloy material with low odor and low emission comprises the following components: prepared from 50-80% of PC resin, 10-45% of ABS/PP graft, 1-5% of hydrophobic odor adsorption master batch, 0.1-1% of antioxidant and 0-5% of other additives; the hydrophobic odor adsorption master batch is prepared by mixing, extruding and granulating attapulgite modified by ABS resin and quaternary ammonium salt surfactant. The method mainly utilizes the adsorption function of the hydrophobic adsorption master batch, so that the method can better adsorb the dispersed substances, but the alkaline surfactant can affect PC, and finally can seriously affect the mechanical property, particularly the impact property, of the system. Patent document CN103554867A discloses: a low VOC high performance PC/ABS alloy material: the ABS resin is prepared from 30-80% of PC resin, 5-50% of ABS resin, 1-10% of compatilizer, 0.1-1% of odor absorbent and 0.1-1% of processing aid. Although this method can effectively reduce the odor level of the product by adding an odor absorbent, the reduction effect on VOC is not good. Patent document CN103709704A discloses: a low odor, low emission PC/ABS alloy comprising the components: 30-80% of PC resin: ABS resin: 4 to 66.4 percent; a compatilizer: 2 to 10 percent; 1-5% of water master batch; 0.1 to 3 percent of auxiliary agent. In the patent document, jellyfish particles with high-melt foamed PP as a carrier are used as a stripping agent, so that various volatile small molecules and organic compounds generated in the processing process can be effectively removed without influencing the mechanical properties of the jellyfish particles, but the PP and PC/ABS systems have poor compatibility, and a large amount of compatilizers are required to be added to improve the compatibility, so that the cost is high and the mechanical properties are poor.

Therefore, a PC/ABS alloy material with low odor and emission and excellent mechanical properties is urgently needed.

Disclosure of Invention

Therefore, the invention aims to provide a PC/ABS alloy material with low odor and emission and excellent mechanical property, further provides a preparation method and application thereof, and further provides an automobile interior part prepared from the PC/ABS alloy material.

The invention is realized by the following technical scheme:

in a first aspect, the invention provides a low-odor low-emission PC/ABS alloy material, which comprises the following raw material components in percentage by weight of the total weight of a polycarbonate resin, an ABS resin, a compatilizer and a foaming polymer as 100 percent:

preferably, in the low-odor and low-emission PC/ABS alloy material of the present invention, the foamed polymer is a foamed TPU, preferably a polyether-type foamed TPU, and more preferably one or more of ETPU, F620, and F815; and/or the polyether type foaming TPU has the density of 0.09 to 0.3g/cm²Preferably 0.2 to 0.25g/cm²The falling ball rebound resilience is 50 to 70%, preferably 58 to 65%.

Preferably, in the low-odor and low-emission PC/ABS alloy material of the present invention, the polycarbonate resin is selected from one or more of aromatic polycarbonate, aliphatic polycarbonate and aromatic-aliphatic polycarbonate, preferably selected from bisphenol a polycarbonate; and/or the number average molecular weight of the polycarbonate resin is 12000-30000, preferably 15000-25000; and/or the polycarbonate resin has a residual amount of volatiles of not more than 50ppm, preferably not more than 10 ppm.

The number average molecular weight of the polycarbonate resin is within the range of 12000-30000 and preferably 15000-25000, so that the polycarbonate resin has excellent mechanical properties and good processability.

Preferably, in the low-odor and low-emission PC/ABS alloy material of the invention, the ABS resin is a styrene-acrylonitrile-butadiene copolymer, wherein the content of butadiene is 12-30 wt%, the content of acrylonitrile is 15-35 wt%, and the content of styrene is 50-70 wt%, based on 100% by mass of the styrene-acrylonitrile-butadiene copolymer; and/or the residual amount of volatiles in the ABS resin is not more than 400ppm, preferably not more than 200 ppm.

The ABS resin is prepared by adopting an emulsion method and a bulk method, and preferably the bulk method.

Preferably, in the low-odor and low-emission PC/ABS alloy material, the compatilizer is selected from one or more of ABS-grafted maleic anhydride ABS-g-MAH, POE-grafted maleic anhydride POE-g-MAH, ABS-grafted glycidyl methacrylate ABS-g-GMA and POE-grafted glycidyl methacrylate POE-g-GMA, and is preferably selected from ABS-grafted maleic anhydride ABS-g-MAH.

Preferably, the low-odor and low-emission PC/ABS alloy material further comprises 0-10%, preferably 0.1-3% of plastic additives and/or one or more plastic additives selected from an antioxidant, a lubricant and an ultraviolet absorbent, based on 100% of the total weight of the polycarbonate resin, the ABS resin, the compatilizer and the foaming polymer, and/or comprises one or more primary antioxidants selected from β - [3, 5-di-tert-butyl-4-hydroxyphenyl ] propionic acid n-octadecyl ester and/or tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, secondary antioxidants selected from tris [ 2.4-di-tert-butylphenyl ] phosphite and/or bis [ 2.4-di-tert-butylphenyl ] pentaerythritol diphosphite, and/or comprises 2- (2 ' -hydroxy-5 ' tert-octylphenyl) benzotriazole and/or 2- (2 ' -hydroxy-3 ' 5 ' bis (a-dimethylphenyl)) benzotriazole and/or 2- (2 ' -hydroxy-3 ' a-dimethylbenzyl) benzotriazole and/or silicone grease, or silicone.

In a second aspect, the invention provides a preparation method of the low-odor low-emission PC/ABS alloy material, which comprises the following steps:

(1) weighing polycarbonate resin, ABS resin, compatilizer and foaming polymer according to the selected weight ratio;

(2) respectively adding the weighed polycarbonate resin, ABS resin and compatilizer into a mixer, and uniformly mixing;

(3) adding the uniformly mixed polycarbonate resin, ABS resin and compatilizer into a double-screw extruder through a feeding port;

(4) then adding the foamed polymer into a double-screw extruder from a lateral feeding port, and then carrying out melt blending, extrusion, granulation and drying to obtain the PC/ABS alloy material;

preferably, the method comprises the following steps:

(1) weighing polycarbonate resin, ABS resin, compatilizer, foaming polymer and plastic additive according to the selected weight ratio;

(2) respectively adding the weighed polycarbonate resin, ABS resin, compatilizer and plastic additive into a mixer, and uniformly mixing;

(3) adding the uniformly mixed polycarbonate resin, ABS resin, compatilizer and plastic additive into a double-screw extruder through a feeding port;

(4) and then adding the foamed polymer into a double-screw extruder from a lateral feeding port, and then carrying out melt blending, extrusion, granulation and drying to obtain the PC/ABS alloy material.

Preferably, in the preparation method of the PC/ABS alloy material, the barrel temperature of the double-screw extruder is 200-250 ℃, and the screw rotation speed is 200-500 RPM; and/or, the drying refers to drying at 80 ℃ for 4 h.

In a third aspect, the invention provides the use of the PC/ABS alloy material or the PC/ABS alloy material prepared by the preparation method in the preparation of automotive upholstery; the automotive interior part is selected from: at least one of an instrument panel framework, an auxiliary instrument panel, an air outlet of an air conditioner, a demisting grid, an interior rearview mirror and a glove box.

In a fourth aspect, the invention provides an automotive interior part, which is made of the PC/ABS alloy material or the PC/ABS alloy material prepared by the preparation method; the automotive interior part is selected from: at least one of an instrument panel framework, an auxiliary instrument panel, an air outlet of an air conditioner, a demisting grid, an interior rearview mirror and a glove box.

The technical scheme provided by the invention has the following beneficial effects:

according to the PC/ABS alloy material, PC and ABS resin with low residual volatile matter are screened, and a specific type of foaming polymer is added, so that on one hand, air and CO contained in the foaming polymer are caused by the breakage of foam pores of the foaming polymer in the extrusion process₂When the gas is released, volatile matters are taken out through gas entrainment and a vacuum system, so that the VOC content and the odor of the PC/ABS alloy material are reduced, and the PC/ABS alloy material has the characteristics of low odor and low emission; on the other hand, the foamed polymer, especially the foamed TPU, can improve the toughness of the system, so that the PC/ABS alloy material has excellent mechanical properties. In addition, in the PC/ABS alloy material, the polyether type foaming TPU can improve the hydrolysis resistance of a system, so that the PC/ABS alloy material has good hydrolysis resistance.

Detailed Description

In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.

In the following examples and comparative examples of the present invention, the raw materials and sources used are as follows:

a1105, bisphenol A polycarbonate, available from Vanhua chemical group Ltd, number average molecular weight 23000, residual amount of volatiles 5 ppm.

8434 ABS resin, purchased from Shanghai Gaoqiao, produced by a continuous bulk process, wherein the butadiene content is 14 wt%, the acrylonitrile content is 26 wt%, and the styrene content is 60 wt%; the melt index at 220 ℃/10kg was 14g/10min, and the residual amount of volatiles was 80 ppm.

KT-3, a compatibilizer, purchased from Shenyang four-dimensional ABS-g-MAH product, with a grafting rate of 1.1%.

GR 216, POE-g-MAH, compatibilizer, available from Dow chemical, with a grafting yield of 0.8%.

ETPU, polyether foam TPU from Pasf, density 0.25g/cm²The ball rebound resilience is 65%.

F620, polyether foam TPU from Meirui, density 0.23g/cm²The ball rebound resilience is 58%.

F815, polyether foam TPU from Meirui, density 0.2g/cm²The ball rebound resilience is 58%.

W820, polyester type foaming TPU, self-made by supercritical CO₂Kettle type foaming process with density of 0.2g/cm²The ball rebound resilience was 57%.

And B900, an antioxidant which is purchased from BASF, wherein the mass ratio of the main antioxidant β - [3, 5-di-tert-butyl-4-hydroxyphenyl ] propionic acid n-octadecyl ester (1076) to the auxiliary antioxidant tris [2, 4-di-tert-butylphenyl ] phosphite (168) is 1: 4.

PETS, lubricant, available from American Dragon Sand.

Example 1

The preparation method of the PC/ABS alloy material comprises the following steps:

(1) respectively weighing 8kg of A1105, 1kg of 8434, 0.7kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.3kg of ETPU;

(2) mixing the above weighed materials except ETPU in a high-speed mixer for 5min, and discharging;

(3) adding the mixed materials into a double-screw extruder through a feeding port, wherein the temperature of each section of the extruder is set as shown in the specification (from the feeding port to a machine head) that the temperature is 80 ℃, 220 ℃, 245 ℃, 240 ℃, the temperature of a neck ring is 240 ℃, and the extrusion speed is 300 RPM;

(4) adding ETPU into a double-screw extruder from a lateral feeding port, and then carrying out melt blending, extrusion and water-cooling granulation; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material.

Example 2

(1) 8kg of A1105, 1kg of 8434, 0.7kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.3kg of F620 are weighed out respectively.

(2) Mixing the other materials except F620 weighed in a high-speed mixer for 5min, and discharging;

(4) f620 is added into a double-screw extruder from a lateral feeding port, and then melt blending, extrusion and water-cooling granulation are carried out; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material.

Example 3

(1) 8kg of A1105, 1kg of 8434, 0.7kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.3kg of F815 were weighed out respectively.

(2) Mixing the other materials except F815 in a high-speed mixer for 5min, and discharging;

(4) f815 is added into a double-screw extruder from a lateral feeding port, and then is subjected to melt blending, extrusion and water-cooling granulation; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material.

Example 4

(1) 3kg of A1105, 6kg of 8434, 0.05kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.95kg of ETPU are weighed respectively.

(2) Mixing the above materials except ETPU in a high-speed mixer for 5min, and discharging;

(3) adding the mixed materials into a double-screw extruder through a feeding port, wherein the temperature of each section of the extruder is set as shown in the specification (from the feeding port to a machine head) that the temperature is 80 ℃, 220 ℃, 245 ℃, 240 ℃, the temperature of a neck ring is 240 ℃, and the extrusion speed is 200 RPM;

(4) adding ETPU into a double-screw extruder from a lateral feeding port, and then carrying out melt blending, extrusion and water-cooling granulation; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material modified material, extruding the modified material from a die, and performing water-cooling granulation.

Example 5

(1) 4kg of A1105, 5kg of 8434, 0.8kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.2kg of ETPU are weighed respectively.

(3) adding the mixed materials into a double-screw extruder through a feeding port, wherein the temperature of each section of the extruder is set as shown in the specification (from the feeding port to a machine head) that the temperature is 80 ℃, 220 ℃, 245 ℃, 240 ℃, the temperature of a neck ring is 240 ℃, and the extrusion speed is 500 RPM;

Example 6

(1) 4.5kg of A1105, 4kg of 8434, 0.5kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 1kg of ETPU are weighed respectively.

(4) adding EYPU into a double-screw extruder from a lateral feeding port, and then carrying out melt blending, extrusion and water-cooling granulation; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material modified material, extruding the modified material from a die, and performing water-cooling granulation.

Example 7

(1) 5.8kg of A1105, 3kg of 8434, 1kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.2kg of ETPU are weighed respectively.

Example 8

(1) 6kg of A1105, 3kg of 8434, 0.2kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.8kg of ETPU are weighed respectively.

Example 9

(1) 6kg of A1105, 2.99kg of 8434, 1kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.01kg of ETPU are weighed respectively.

Example 10

(1) 7kg of A1105, 2.85kg of 8434, 0.1kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.05kg of ETPU are weighed respectively.

Example 11

(1) 9kg of A1105, 0.5kg of 8434, 0.3kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.2kg of ETPU were weighed out respectively.

(3) adding the mixed materials into a double-screw extruder through a feeding port, wherein the temperature of each section of the extruder is set as shown in the specification (from the feeding port to a machine head) that the temperature is 80 ℃, 220 ℃, 250 ℃, 245 ℃, the temperature of a neck ring mold is 245 ℃, and the extrusion speed is 300 RPM;

Example 12

(1) 6kg of A1105, 3kg of 8434, 0.2kg of GR 216, 0.02kg of B900, 0.03kg of PETS and 0.8kg of ETPU were weighed out respectively.

Comparative example 1

The preparation method of the PC/ABS alloy material of the comparative example comprises the following steps:

(1) 4kg of A1105, 5kg of 8434, 0.8kg of KT-3, 0.02kg of B900, 0.03kg of PETS and 0.2kg of W820 were weighed out respectively.

(2) Mixing the weighed materials except W820 in a high-speed mixer for 5min, and discharging;

(4) adding W820 into a double-screw extruder from a lateral feeding port, and then carrying out melt blending, extrusion and water-cooling granulation; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material.

Comparative example 2

(1) respectively weighing 8.9kg of A1105, 1.1kg of 8434, 0.02kg of B900 and 0.03kg of PETS;

(2) mixing the weighed materials in a high-speed mixer for 5min, and discharging;

(4) then carrying out melt blending, extrusion and water-cooling granulation; and drying the obtained granules at 80 ℃ for 4h to obtain the PC/ABS alloy material.

Examples of the experimentsPerformance testing

In order to test the properties of the PC/ABS alloy materials, pellets obtained in examples 1 to 12 and comparative examples 1 to 2 were dried at 80 ℃ for 4 hours, respectively, and then injection-molded into standard mechanical test bars, to obtain test bars for examples 1 to 12 and comparative examples 1 to 2, respectively.

1. VOC testing

The test was performed according to VDA277 standard. Measured using a headspace-gas chromatograph (FID detector).

The test specimens of examples 1 to 12 and comparative examples 1 to 2 were each prepared at prescribed positions over the entire cross section of the structural member, and the specimens were cut into pieces having a weight of 10 to 25mg, during which the specimens could not be heated; sample weighing the sample was weighed out in terms of bottle volume, 1.000 g. + -. 0.001g per 10ml volume (i.e. weighing error 0.1% maximum). The specific test results are shown in tables 1-1 and 1-2.

2. Odor test

The test was performed according to the VDA270 standard.

The test specimens of examples 1 to 12 and comparative examples 1 to 2 were cut at predetermined positions, respectively, and the weight (20. + -.2) g of the specimens was put in a 1L special container, stored at 80. + -. 2 ℃ for 2 hours. + -. 10 minutes, and before evaluation, the container was first cooled to the temperature (60. + -.5) ℃ in the test chamber after being taken out from the heating chamber. After evaluation by 3 examiners, the container should be returned to the heating chamber at a temperature of (80. + -.2 ℃ C.) for about 30 minutes again, and then evaluated by other persons. The specific test results are shown in tables 1-1 and 1-2.

3. Evaluation of hydrolysis Performance

Standard impact bars (80X 10X 4mm) were prepared from the test bars of examples 1-12 and comparative examples 1-2, respectively, and then placed in a constant temperature and humidity chamber under test conditions of 85 ℃ and 85 RH%, and the retention of impact properties after the material was left to stand under high humidity and heat conditions for 500 hours was examined. The specific test results are shown in tables 1-1 and 1-2.

4. Notched izod impact test

Testing was performed according to ASTM D638.

Standard impact bars (63.5X 12.5X 3.2mm) were prepared from the test bars of examples 1 to 12 and comparative examples 1 to 2, respectively, and after an A-type notch (notch depth of 2.5mm) was prepared using a notching machine, a cantilever notch impact test was performed using a pendulum impact tester and a cantilever clamp. The specific test results are shown in tables 1-1 and 1-2.

TABLE 1-1 Performance test results

TABLE 1-2 Performance test results

As can be seen from tables 1-1 and tables 1-2, the PC/ABS alloy materials prepared in examples 1-12 have not only significantly reduced VOC content and odor level, but also good mechanical properties and hydrolysis resistance, as compared with comparative examples 1-2.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. a PC/ABS alloy material with low odor and low emission is characterized in that, with the total weight of polycarbonate resin, ABS resin, compatibilizer and foaming polymer being 100%, including following raw material components:

2. PC/ABS alloy material with low odor and low emission according to claim 1, is characterized in that, described foamed polymer is foamed TPU, preferably polyether type foamed TPU, more preferably ETPU, F620 and one or more of F815; and/or,

The density of the polyether foamed TPU is 0.09-0.3 g/cm ² , preferably 0.2-0.25 g/cm ² , and the ball rebound rate is 50-70%, preferably 58-65%.

3. the PC/ABS alloy material of low odor and low emission according to claim 1 and 2, is characterized in that,

The polycarbonate resin is selected from one or more of aromatic polycarbonate, aliphatic polycarbonate and aromatic-aliphatic polycarbonate, preferably selected from bisphenol A polycarbonate; and/or ,

The number average molecular weight of the polycarbonate resin is 12000-30000, preferably 15000-25000; and/or,

The residual amount of volatile matter in the polycarbonate resin is not higher than 50 ppm, preferably not higher than 10 ppm.

4. the PC/ABS alloy material with low odor and low emission according to any one of claims 1-3, is characterized in that,

The ABS resin is a styrene-acrylonitrile-butadiene copolymer, wherein, based on 100% of the mass of the styrene-acrylonitrile-butadiene copolymer, the content of butadiene is 12-30 wt%, and the propylene The nitrile content is 15-35 wt% and the styrene content is 50-70 wt%; and/or,

The residual amount of volatile matter in the ABS resin is not higher than 400ppm, preferably not higher than 200ppm.

5. the PC/ABS alloy material with low odor and low emission according to any one of claims 1-4, is characterized in that,

The compatibilizer is selected from ABS grafted maleic anhydride ABS-g-MAH, POE grafted maleic anhydride POE-g-MAH, ABS grafted glycidyl methacrylate ABS-g-GMA and POE grafted methyl ester. One or more of glycidyl acrylate POE-g-GMA, preferably selected from ABS grafted maleic anhydride ABS-g-MAH.

6. the PC/ABS alloy material of low odor and low emission according to any one of claims 1-5, is characterized in that, with the total weight of polycarbonate resin, ABS resin, compatibilizer and foaming polymer as 100%, also includes the following raw material components:

Plastic additives 0-10%, preferably 0.1-3%; and/or,

The plastic additive is selected from one or more of antioxidants, lubricants and UV absorbers; and/or,

Among the antioxidants, the main antioxidant is selected from β-[3,5-di-tert-butyl-4-hydroxyphenyl]propionic acid n-octadecyl ester and/or tetrakis[β-(3,5 - one or more of di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol esters, the auxiliary antioxidant is selected from tris[2.4-di-tert-butylphenyl]phosphite and/or bis[ 2.4-Di-tert-butylphenyl]pentaerythritol diphosphite; and/or,

The ultraviolet absorber is selected from 2-(2'-hydroxy-5'terctylphenyl)benzotriazole and/or 2-(2'-hydroxy-3'5'bis(a,a-dimethylene) benzyl) phenyl)) benzotriazole; and/or,

The lubricant is selected from pentaerythritol stearate and/or silicone powder.

7. the preparation method of the PC/ABS alloy material of the described low odor and low emission of any one of claim 1-6, is characterized in that,

Include the following steps:

(1) take by weighing polycarbonate resin, ABS resin, compatibilizer, foamed polymer according to the selected weight ratio;

(2) respectively add the polycarbonate resin, ABS resin, compatibilizer taken by weighing into the mixer, and mix uniformly;

(3) adding the polycarbonate resin, ABS resin and compatibilizer after mixing uniformly into the twin-screw extruder through the feeding port;

(4) Then the foamed polymer is added to the twin-screw extruder from the side feeding port, and then melt-blended, extruded, granulated, and dried to obtain PC/ABS alloy material;

Preferably, the following steps are included:

(1) take by weighing polycarbonate resin, ABS resin, compatibilizer, foaming polymer and plastic additive according to selected weight proportioning respectively;

(2) respectively add the polycarbonate resin, ABS resin, compatibilizer and plastic additive taken by weighing into the mixer, and mix uniformly;

(3) adding the polycarbonate resin, ABS resin, compatibilizer and plastic additive after mixing uniformly into the twin-screw extruder through the feeding port;

(4) The foamed polymer is then fed into the twin-screw extruder through the side feeding port, and then melt-blended, extruded, granulated and dried to obtain PC/ABS alloy material.

8. the preparation method of PC/ABS alloy material according to claim 7, is characterized in that,

The barrel temperature of the twin-screw extruder is 200-250° C., and the screw speed is 200-500 RPM; and/or, the drying refers to drying at 80-110° C. for 2-6 hours.

9. use of the PC/ABS alloy material according to any one of claims 1 to 6 or the PC/ABS alloy material prepared by the preparation method according to claim 7 or 8 in the preparation of automotive interior parts; the The automotive interior parts are selected from at least one of: instrument panel frame, sub-instrument panel, air-conditioning air outlet, defogging grille, interior rear-view mirror and glove box.

10. An automobile interior trim part, characterized in that the PC/ABS alloy material prepared by the PC/ABS alloy material according to any one of claims 1-6 or the preparation method according to claim 7 or 8 The automobile interior parts are selected from at least one of: instrument panel frame, sub-instrument panel, air-conditioning outlet, defogging grille, interior rear-view mirror and glove box.