PC / ABS alloy material as well as preparation method and application thereof

Abstract

The invention discloses a PC / ABS alloy material as well as a preparation method and application thereof, and relates to the field of polymer material modification. The PC / ABS alloy material comprises the following components in parts by weight: 25 to 55 parts of polycarbonate resin, 25 to 50 parts of acrylonitrile-styrene copolymer, 10 to 30 parts of acrylonitrile-butadiene-styrene copolymer, and 1.0 to 10 parts of mixed additive. The PC / ABS alloy material is prepared from the wet-process ABS powder, the rubber content is adjustable, and the formula design is flexible. The prepared alloy material has the characteristics of low residual monomer content and good low temperature resistance and impact resistance, and can be widely applied to the fields of automobiles, household appliances, new energy and the like.

Description

Technical Field

[0001] The invention relates to the field of polymer material modification, and in particular to a preparation method and application of a PC / ABS alloy material. Background Art

[0002] PC / ABS alloy material is a thermoplastic alloy material obtained by blending and modifying polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS), and is also commonly referred to as PC / ABS alloy material. Through the blending of PC and ABS, the heat resistance of ABS is improved and the internal stress of PC is reduced. The prepared alloy material has both the excellent mechanical properties of PC and the good processing and molding characteristics of ABS, and is widely used in the fields of automobiles, home appliances, electronic appliances, etc.

[0003] In the preparation of PC / ABS alloy materials, the preparation of ABS particles includes bulk method and emulsion blending method. Among them, bulk method ABS has the characteristics of low impurity content and low volatile component content, and the PC / ABS alloy prepared by it has the advantage of low odor (VOC). For example, the patent with publication number CN111117196B discloses a low-odor and low-emission PC / ABS alloy material, which is prepared by selecting bulk method polymerization ABS raw materials, adding a specific type of foaming polymer, and volatile component content to prepare low-odor PC / ABS alloy. However, the rubber content of ABS particles prepared by the above two methods is low and fixed, and there are many restrictions in the preparation of PC / ABS alloy. The high rubber content ABS powder obtained by emulsion graft polymerization is directly added with PC and SAN resin for blending modification, and the rubber content in the alloy can be adjusted, the formula design is flexible, and the material properties can be customized. However, due to the large amount of impurities in the emulsion grafted ABS powder, the prepared alloy material has a high volatile component content and poor odor, which limits its wide application. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a preparation method of PC / ABS alloy material and its application. By using undried ABS powder to prepare PC / ABS alloy material, the rubber content can be adjusted and the formula design is flexible. The alloy material prepared by the present invention has the characteristics of less residual monomer content and good low temperature resistance and impact resistance, and can be widely used in the fields of automobiles, home appliances, new energy, etc.

[0005] To achieve the above object, the present invention provides a technical solution: A PC / ABS alloy material comprises the following components by weight: Polycarbonate resin (PC) 25-55; Acrylonitrile-styrene copolymer (SAN) 31-50; Acrylonitrile butadiene styrene copolymer (ABS) 10-30; Mixed additives 1.0-10; The acrylonitrile-butadiene-styrene copolymer is ABS powder with a moisture content of 0.1-40%.

[0006] Preferably, the moisture content of the acrylonitrile-butadiene-styrene copolymer is 1-30%.

[0007] The acrylonitrile-butadiene-styrene copolymer (ABS) is obtained by graft copolymerization of polybutadiene (PBD) as a matrix with acrylonitrile and styrene emulsion, and the PBD content of the ABS is 50-80%.

[0008] The polycarbonate resin (PC) is polycarbonate particles or slices prepared by melt polycondensation or interfacial polycondensation, and has a number average molecular weight of 16000-40000 and a weight average molecular weight of 20000-50000.

[0009] The polycarbonate resin (PC) has a melt index of 5-25 g / 10 min at 300° C.×1.2 kg.

[0010] The acrylonitrile-styrene copolymer (SAN) has a melt index of 10-35 g / 10 min at 220° C.×5 kg.

[0011] The mixed additive (ADD) includes at least an antioxidant and a lubricant.

[0012] Optional components include compatibilizers, toughening agents, hydrolysis resistance agents, UV absorbers, dyes, pigments and masterbatches.

[0013] The lubricant is one of pentaerythritol stearate (PETS) or low molecular weight polyethylene wax.

[0014] The antioxidant is a combination of one or more hindered phenol, hindered amine or phosphite antioxidants; Preferably, a combination of one of 168, 1010, 1076, and 626 is used.

[0015] The compatibilizer is one or more combinations of graft copolymers of acrylonitrile-styrene and maleic anhydride or acrylate or glycidyl methacrylate.

[0016] The toughening agent is styrene-butadiene-styrene block copolymer, styrene-butadiene-methyl methacrylate copolymer, a core-shell structure toughening agent of acrylate and silicone, a polyolefin elastomer, and the like.

[0017] The anti-hydrolysis agent is a combination of one or more of polymeric carbodiimide (BDI) and talc.

[0018] The ultraviolet absorber is dibenzoyl ketone, benzotriazole, salicylate and the like.

[0019] Preferably, one or more of UV-9, UV-P, UV326 and UV327 are used in combination.

[0020] The dye, pigment and masterbatch are various materials used for coloring alloy materials.

[0021] The present invention also provides a method for preparing a PC / ABS alloy material, comprising the following steps: after measuring the various raw material components according to a specified weight ratio, adding them into a twin-screw extruder in sections, and preparing the PC / ABS alloy material through processes such as heating and melting, stirring and mixing, extruding and cooling, drying and pelletizing.

[0022] The twin-screw extruder is a co-rotating meshing twin-screw extruder, and its barrel at least comprises a feeding section 1, a feeding section 2, a feeding section 3, a degassing section 1, a degassing section 2, a mixing section 1, and a mixing section 2, and the temperature of each section is controlled at 150-300°C.

[0023] The feeding section 1 is SAN feed in a molten or solid state, preferably molten state, and the temperature is controlled at 180-230°C.

[0024] The feeding section 2 is for feeding ABS powder, the moisture content of the undried ABS copolymer is 1-30%, and the temperature is controlled at 150°C-250°C.

[0025] The mixing section 1 adopts intermeshing screw elements with enhanced mixing effect to promote full contact and mixing between ABS powder and high-temperature SAN melt, so that the moisture in the ABS powder is heated and vaporized and expanded, and volatile components such as AN and SM monomers in the raw materials are taken away. The temperature is controlled at 180-250°C.

[0026] The degassing section 1 includes side exhaust and top exhaust, both of which are equipped with a vacuum system, with the pressure controlled at 0.00-0.04 MPa absolute pressure and the temperature controlled at 200-260°C to extract volatile gases such as moisture and residual monomers produced in the melt mixing section.

[0027] The feeding section 3 is used to feed PC particles / powder and additives simultaneously, and the temperature is controlled at 200-300°C; The mixing section 2 adopts intermeshing screw elements with enhanced mixing effect to ensure that the three phases of PC, SAN and ABS are fully mixed, and the temperature is controlled at 200-300°C.

[0028] The degassing section 2 is provided with a vacuum system, the pressure is controlled at 0-0.04 MPa absolute pressure, and the temperature is controlled at 200-300° C., so as to extract the volatile components generated in the melt mixing section.

[0029] The present invention also provides a PC / ABS alloy material for use in the fields of automotive parts, household appliances, consumer electronics, office equipment, etc.

[0030] Beneficial effects: The present invention adopts molten SAN to directly feed the extruder, thereby eliminating the process of SAN granulation, cooling and then heating to melt, reducing the load and energy consumption of the extruder; at the same time, the high temperature of the SAN melt is used to heat the undried ABS powder, and the evaporation of its water has a stripping effect on volatile components such as residual monomers in the raw materials, thereby reducing the volatile component (VOC) content of the prepared PC / ABS alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the layout diagram of the extruder barrel of the present invention. DETAILED DESCRIPTION

[0032] For better understanding and implementation, the present invention is further described below by comparing comparative products with the products of the embodiments of the present invention. However, the present invention is not limited to the listed embodiments, but also includes any other known modifications, substitutions or changes within the scope of the rights claimed by the present invention.

[0033] In the examples and comparative examples used in the experiments, the raw materials were measured according to the prescribed ratio, added to the twin-screw extruder in the manner described, and the PC / ABS alloy materials of the examples and comparative examples were obtained through the processes of mixing, stirring, exhausting, kneading, extruding, drawing, cooling, drying, pelletizing, etc.

[0034] Example 1 A PC / PBS alloy material, comprising the following components in parts by weight: Polycarbonate resin (PC) 30 parts, acrylonitrile-styrene copolymer (SAN) 40 parts, acrylonitrile-butadiene-styrene copolymer (ABS) 30 parts, mixed additives: lubricant PETS 0.5 parts, antioxidant I-1010 0.3 parts, antioxidant I-168 0.2 parts, anti-hydrolysis agent BDI 1 part.

[0035] In this embodiment, the melt index of polycarbonate resin (PC) is 11 g / 10 min, and the preparation process is a melting method; the rubber content of acrylonitrile-butadiene-styrene copolymer (ABS) is 60%, and the water content is 1%; the melt index of acrylonitrile-styrene copolymer (SAN) is 24 g / 10 min.

[0036] In this embodiment: the feed section 1 is a SAN melt feed with a melt index of 24 g / 10 min and an AN content of 25%, and the set temperature is 200°C; Feed section 2 is for ABS powder with a rubber content of 60% and a moisture content of 1%, and the set temperature is 150°C; feed section 3 is for PC with a melt index of 11g / 10min, and the set temperature is 200°C; Mixing sections 1 and 2 use intermeshing screw elements with enhanced mixing effect to improve the blending effect between the components, and the temperatures are set to 160°C and 220°C respectively.

[0037] Exhaust section 1 is set with two vacuum exhaust modes: side and top, and the temperature is set to 170°C; exhaust section 2 is set with top vacuum exhaust mode, and the temperature is set to 230°C. The temperature of the subsequent extrusion section is also set to 230°C.

[0038] Example 2 The specific implementation of this embodiment is the same as that of Embodiment 1, except that the rubber content of acrylonitrile-butadiene-styrene copolymer (ABS) is 60% and the water content is 15%.

[0039] Example 3 A PC / PBS alloy material, comprising the following components in parts by weight: Polycarbonate resin (PC) 30 parts, acrylonitrile-styrene copolymer (SAN) 44.30 parts, acrylonitrile-butadiene-styrene copolymer (ABS) 25.70 parts, mixed additives: lubricant PETS 0.5 parts, antioxidant I-1010 0.3 parts, antioxidant I-168 0.2 parts, anti-hydrolysis agent BDI 1 part.

[0040] The specific implementation of this embodiment is the same as that of Example 1, except that the rubber content of acrylonitrile-butadiene-styrene copolymer (ABS) is 70% and the water content is 25%, that is, the feed section 2 is fed with ABS powder with a rubber content of 70% and a water content of 25%; and the addition amount is converted while keeping the rubber content of the final product the same as that of Example 1.

[0041] Example 4 A PC / PBS alloy material, comprising the following components in parts by weight: Polycarbonate resin (PC) 40 parts, acrylonitrile-styrene copolymer (SAN) 35 parts, acrylonitrile-butadiene-styrene copolymer (ABS) 25 parts, mixed additives: lubricant PETS 0.5 parts, antioxidant I-1010 0.3 parts, antioxidant I-168 0.2 parts, hydrolysis resistance agent BDI 1 part, compatibilizer SAG-002 1 part.

[0042] The specific implementation of this embodiment is the same as that of Example 1, except that the content of polycarbonate resin PC is adjusted to 40 parts, and the corresponding proportions of acrylonitrile-butadiene-styrene copolymer (ABS) and acrylonitrile-styrene copolymer (SAN) are simultaneously reduced to 25 parts of acrylonitrile-butadiene-styrene copolymer (ABS) and 35 parts of acrylonitrile-styrene copolymer (SAN).

[0043] The temperature of feed section 1 is set to 200℃, the temperature of feed section 2 is set to 160℃, the temperature of mixing section 1 is set to 170℃, the temperature of exhaust section 1 is set to 180℃, the temperature of feed section 3 is set to 210℃, the temperature of mixing section 2 is set to 230℃, the temperature of exhaust section 2 is set to 240℃, and the temperature of extrusion section is set to 240℃.

[0044] Example 5 A PC / PBS alloy material, comprising the following components in parts by weight: Polycarbonate resin (PC) 50 parts, acrylonitrile-styrene copolymer (SAN) 25 parts, acrylonitrile-butadiene-styrene copolymer (ABS) 25 parts, mixed additives: lubricant PETS 0.5 parts, antioxidant I-1010 0.3 parts, antioxidant I-168 0.2 parts, hydrolysis resistance agent BDI 1 part, compatibilizer SAG-002 1 part.

[0045] The specific implementation of this embodiment is the same as that of Example 1, except that the content of polycarbonate resin (PC) is adjusted to 50 parts, and the corresponding proportions of acrylonitrile-butadiene-styrene copolymer (ABS) and acrylonitrile-styrene copolymer (SAN) are simultaneously reduced, and adjusted to 25 parts of acrylonitrile-butadiene-styrene copolymer (ABS) and 25 parts of acrylonitrile-styrene copolymer (SAN).

[0046] The temperature of feed section 1 is set to 200℃, the temperature of feed section 2 is set to 170℃, the temperature of mixing section 1 is set to 180℃, the temperature of exhaust section 1 is set to 190℃, the temperature of feed section 3 is set to 220℃, the temperature of mixing section 2 is set to 240℃, the temperature of exhaust section 2 is set to 250℃, and the temperature of extrusion section is set to 260℃.

[0047] Example 6 A PC / PBS alloy material, comprising the following components in parts by weight: Polycarbonate resin (PC) 55 parts, acrylonitrile-styrene copolymer (SAN) 25 parts, acrylonitrile-butadiene-styrene copolymer (ABS) 20 parts, mixed additives: lubricant PETS 0.5 parts, antioxidant I-1010 0.3 parts, antioxidant I-168 0.2 parts, hydrolysis resistance agent BDI 1 part, compatibilizer SAG-002 2 parts.

[0048] The specific implementation of this embodiment is the same as that of Example 1, except that the content of polycarbonate resin (PC) is adjusted to 55 parts, and the corresponding proportions of acrylonitrile-butadiene-styrene copolymer ABS and acrylonitrile-styrene copolymer (SAN) are simultaneously reduced to 20 parts of acrylonitrile-butadiene-styrene copolymer ABS and 25 parts of acrylonitrile-styrene copolymer (SAN).

[0049] The temperature of feed section 1 is set to 200℃, the temperature of feed section 2 is set to 180℃, the temperature of mixing section 1 is set to 190℃, the temperature of exhaust section 1 is set to 200℃, the temperature of feed section 3 is set to 220℃, the temperature of mixing section 2 is set to 250℃, the temperature of exhaust section 2 is set to 260℃, and the temperature of extrusion section is set to 270℃.

[0050] Example 7 The specific implementation of this embodiment is the same as that of Example 4, except that a low melt index SAN with a melt index of 12 g / 10 min is used, and the other materials and processing conditions are the same as those of Example 4.

[0051] Example 8 The specific implementation of this embodiment is the same as that of Example 3, except that low melt index PC with a melt index of 7 g / 10 min is used, and the other materials and processing conditions are the same as those of Example 3.

[0052] Example 9 The specific implementation of this embodiment is the same as that of embodiment 6, except that high melt index PC with a melt index of 22 g / 10 min and high melt index SAN with a melt index of 35 g / 10 min are used. The remaining materials and processing conditions are the same as those of embodiment 6.

[0053] Comparative Example 1 A PC / PBS alloy material, comprising the following components in parts by weight: Polycarbonate resin (PC) 30 parts, acrylonitrile-butadiene-styrene copolymer (ABS) 70 parts, mixed additives: lubricant PETS 0.5 parts, antioxidant I-1010 0.3 parts, antioxidant I-168 0.2 parts, anti-hydrolysis agent BDI 1 part.

[0054] In this embodiment, the melt index of the polycarbonate resin (PC) is 11 g / 10 min, and the preparation process is a melting method; the acrylonitrile-butadiene-styrene copolymer (ABS) is a bulk method ABS8391.

[0055] In this comparative example: feed section 1 is left blank, feed section 2 is bulk ABS8391 feed, and the equipment temperature is 150°C; feed section 3 is PC feed with a melt index of 11g / 10min, and the set temperature is 200°C; Mixing sections 1 and 2 use intermeshing screw elements with enhanced mixing effect to improve the blending effect between the components, and the temperatures are set to 160°C and 220°C respectively.

[0056] Exhaust section 1 is set with two vacuum exhaust modes: side and top, and the temperature is set to 170°C; exhaust section 2 is set with top vacuum exhaust mode, and the temperature is set to 230°C. The temperature of the subsequent extrusion section is also set to 230°C.

[0057] In Comparative Example 1, except that the feed section 1 was left blank and the feed section 2 was filled with 70 parts of bulk ABS8391, the other material components, contents and processing conditions were the same as those in Example 1.

[0058] Comparative Example 2 The specific implementation of this comparative example is the same as that of Example 4, except that the feed section 2 is 60 parts of bulk ABS8391, and the other material components, contents and processing conditions are the same as those of Example 4.

[0059] Comparative Example 3 The specific implementation of this comparative example is the same as that of Example 5, except that the feed section 2 is 50 parts of bulk ABS8391, and the other material components, contents and processing conditions are the same as those of Example 5.

[0060] Comparative Example 4 The specific implementation of this comparative example is the same as that of Example 6, except that the feed section 2 is 45 parts of bulk ABS8391, and the other material components, contents and processing conditions are the same as those of Example 6.

[0061] Table 1 Content of each component in Examples 1-9 and Comparative Examples 1-4.

[0062] The various raw material information and processing conditions in the embodiments and comparative examples are shown in the table below.

[0063] Table 2-1 PC raw material information. PC PC PC Preparation process Melt method Melt method Melt method Melt index 7 11 22

[0064] Table 2-2ABS raw material information.

[0065] Table 2-3 SAN raw material information. SAN SAN SAN Melt index 12 24 35 AN content 30％ 25％ 34％

[0066] Table 2-4 Extruder barrel segment layout, feeding position and temperature settings for each segment (processing conditions).

[0067] Performance Test: The alloy materials prepared in Examples 1-9 and Comparative Examples 1-4 were dried in a forced circulation oven at 100°C for 4 hours, injection molded into standard specimens at 220-260°C, and the prepared specimens were conditioned in an environment of 23°C and 50% RH for 24 hours before testing.

[0068] 1. Izod notched impact performance (IZOD) The test is carried out according to the GB / T 1843 method. A notch is preset on the material and an impact test is carried out to evaluate its impact resistance. The sample size is 80*10*4mm and the notch type is type A.

[0069] Low temperature IZOD test: The specimen is conditioned at -30°C for 2 hours and then tested. The unit is kJ / m 2 .

[0070] The impact strength can be expressed by the following formula: Where a represents the cantilever beam impact strength, unit: kJ / m 2 (kilojoules per square meter); A represents the impact absorbed by the sample, in J; b represents the width of the sample, in mm; d represents the thickness of the sample (the remaining thickness after deducting the notch), in mm. The test results are shown in Table 3.

[0071] Table 3 Izod notched impact performance (IZOD) test results. IZOD(normal temperature) IZOD(-30℃) Example 1 51 33 Example 2 49 34 Example 3 50 31 Example 4 55 35 Example 5 61 39 Example 6 63 42 Example 7 57 37 Example 8 52 38 Example 9 58 40 Comparative Example 1 53 22 Comparative Example 2 53 22 Comparative Example 3 59 27 Comparative Example 4 64 29

[0072] As shown in Table 3, compared with Comparative Example 1, Example 1 has better low-temperature impact resistance. Example 1 and Comparative Example 1 have the same PC content, but the rubber content is higher, so the low-temperature impact resistance is higher; compared with Comparative Example 2, Comparative Example 3 and Comparative Example 4, Example 4, Example 5 and Example 6, the room temperature impact resistance and low-temperature impact resistance of Examples 4, 5 and 6 are better than those of Comparative Examples 2, 3 and 4; compared with Comparative Example 2, Example 4 and Example 7, the rubber content of Examples 4 and 7 is higher than that of Comparative Example 2. The test results show that the low-temperature IZOD of Examples 4 and 7 is better than that of Comparative Example 2. Therefore, high rubber content can improve the low-temperature impact resistance of PC / ABS alloy materials. Using ABS wet powder, the rubber content in PC / ABS alloy can be adjusted, which greatly improves the low-temperature impact resistance.

[0073] Compared with Example 4, Example 7 adopts SAN with a low melt index, and the room temperature impact resistance and low temperature impact resistance of Example 7 are better than those of Example 4; Compared with Example 3, Example 8 adopts PC with a low melt index, and the room temperature impact resistance and low temperature impact resistance of Example 8 are better than those of Example 3; therefore, the use of a low melt index can improve the impact resistance of the PC / ABS alloy material.

[0074] 2. Melt Index (MFI) and Vicat Softening Temperature (VST) Melt Flow Index (MFI): Melt Flow Index (MFI) is an index used to measure the melting and flow difficulty of thermoplastic polymers. The larger the value, the better the fluidity of the material, and vice versa. Refer to GB / T 3682.1 standard, set the temperature to 240℃, load 5kg, flow for 30 seconds, and take samples for testing. The unit is g / 10min.

[0075] Vicat Softening Temperature (VST): Vicat Softening Temperature (VST) is an important indicator used to evaluate the thermal stability of thermoplastics. VST is the temperature when a flat-tip needle is pressed into the surface of a plastic sample to a depth of 1 mm under a specific load and constant temperature increase. The Vicat softening temperature test determines the softening temperature by heating the material and measuring its indentation depth. The higher the Vicat softening temperature, the better the thermal stability of the material. Referring to GB / T 1633 standard, the test conditions are a load of 50N and a heating rate of 50℃ / h, in units of ℃. The test results are shown in Table 4.

[0076] Table 4 Melt index and Vicat softening temperature test results. MFI(240℃*5kg) VST (50N, 50℃ / h) Example 1 9 107 Example 2 10 108 Example 3 10 108 Example 4 8 113 Example 5 6 117 Example 6 5 119 Example 7 7 114 Example 8 7 108 Example 9 25 118 Comparative Example 1 11 108 Comparative Example 2 9 108 Comparative Example 3 6 117 Comparative Example 4 5 119

[0077] As shown in Table 4, the water content of Example 2, Example 3 and Example 9 are all higher than that of other examples, and the relationship of the water content of the three is Example 2> Example 3> Example 9. From the results in the table, it can be seen that the melting index of the three is higher than that of other examples, and the relationship of the melting index of the three is Example 2> Example 3> Example 9. The better the fluidity of the materials of Example 2, Example 3 and Example 9. Therefore, increasing the water content can increase the melting index of the PC / ABS alloy material, thereby improving the fluidity of the alloy material.

[0078] Compared with Example 1, the PC contents of Example 4, Example 5, and Example 6 are all higher than that of Example 1, and the PC contents of the three are in the order of Example 6>Example 5>Example 4. As can be seen from the results in the table, the Vicat softening temperatures (VST) of the three are all higher than those of the other examples, and the thermal stability and heat resistance of the materials of Example 4, Example 5, and Example 6 are better. This indicates that increasing the PC content can improve the thermal stability of the alloy material.

[0079] 3. Residual monomer content (residual monomer) test Residual monomer content (residual monomer): Take 1 g of the colloid particles obtained in Examples 1-9 and Comparative Examples 1-4, and after equilibration treatment with a headspace sampler at 180°C*30min, quantitatively inject them into a gas chromatograph to test the contents of components such as AN, SM, and toluene, in ppm.

[0080] Table 5 Residual monomer test results. Residual monomers (ppm) Example 1 1397 Example 2 1154 Example 3 985 Example 4 863 Example 5 784 Example 6 667 Example 7 834 Example 8 936 Example 9 691 Comparative Example 1 831 Comparative Example 2 767 Comparative Example 3 714 Comparative Example 4 690

[0081] As shown in Table 5, it can be seen from the comparison between Examples 1 and 2 that as the moisture content in the ABS powder increases, the residual monomer content of the obtained product decreases significantly. It can be seen from the comparison between Examples 4, 5, and 6 and Comparative Examples 2, 3, and 4 that as the amount of ABS used decreases and the moisture content of ABS increases in Examples 4, 5, and 6, the residual monomer content of the product can reach the level of bulk ABS. This shows that the moisture in the ABS powder can strip residual monomers such as AN and SM during the heating and evaporation process, and the effect is obvious.

[0082] The PC / ABS preparation method of the present invention cleverly utilizes the heat and moisture in the polymer manufacturing process, simplifies the manufacturing process, reduces the manufacturing cost, and the prepared PC / ABS alloy material has excellent comprehensive performance and has broad application prospects.

Claims

1. A PC / ABS alloy material, comprising the following components by weight: The acrylonitrile-butadiene-styrene copolymer is based on polybutadiene, and is grafted with acrylonitrile and styrene by emulsion, and then condensed to obtain a powder with a moisture content of 0.1-40%.

2. The PC / ABS alloy material according to claim 1, characterized in that: The PBD content of the acrylonitrile-butadiene-styrene copolymer is 50-80%, and the moisture content is 1-30%.

3. The PC / ABS alloy material according to claim 1, characterized in that: The number average molecular weight of the polycarbonate resin is 16000-40000, and the weight average molecular weight is 20000-50000.

4. The PC / ABS alloy material according to claim 1, characterized in that: The mixed additives at least include an antioxidant and a lubricant.

5. A method for preparing a PC / ABS alloy material, characterized in that: The following steps are involved: The polycarbonate resin, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer and mixed additives are measured in a specified weight ratio, added into a twin-screw extruder in sections, and subjected to heating and melting, stirring and mixing, extrusion cooling, drying and pelletizing to prepare an alloy material.

6. The method for preparing the PC / ABS alloy material according to claim 5, characterized in that: The polycarbonate resin has a melt index of 5-25 g / 10 min at 300° C.×1.2 kg.

7. The method for preparing the PC / ABS alloy material according to claim 5, characterized in that: The acrylonitrile-styrene copolymer has a melt index of 10-35 g / 10 min at 220° C.×5 kg.

8. The method for preparing the PC / ABS alloy material according to claim 5, characterized in that: The twin-screw extruder is a co-rotating meshing twin-screw extruder, and its barrel at least comprises feeding section 1, feeding section 2, feeding section 3, degassing section 1, degassing section 2, mixing section 1, mixing section 2, and the temperature of each section is controlled at 150-300°C.

9. The method for preparing the PC / ABS alloy material according to claim 5 or 8, characterized in that: The pressure of the exhaust section 1 of the twin-screw extruder is controlled at an absolute pressure of 0.00-0.04 MPa, and the pressure of the degassing section 2 is controlled at an absolute pressure of 0-0.04 MPa.

10. An application of PC / ABS alloy material, characterized in that: Used in automotive parts, home appliances, consumer electronics, and office equipment.

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