A spray-free matt PC / ABS composite material, a preparation method and application thereof

Abstract

The application relates to a spray-free PC / ABS composite material with a matt effect and a preparation method and application thereof, and belongs to the technical field of polymer materials. The composite material is composed of the following components: PC: 30.0-80.0 parts; ABS: 10.0-60.0 parts; a compatilizer and a matt agent SAMA: 1.0-5.0 parts; an antioxidant: 0.3-0.6 parts; a lubricant: 0.2-1.0 parts; a certain proportion of PC, ABS, SAMA, the antioxidant and the lubricant are uniformly mixed according to a specific process, then are melt-extruded through a double-screw extruder, are cooled in a cooling water tank, are water-removed by an air knife, and are cut into cylindrical granular materials with a diameter of 3-4 mm and a length of 3 mm by a granulator. The requirements of some products with a matt surface are met. Compared with the prior art, the application creatively uses SAMA to obtain a very good matt effect, and also obtains a compatilization and toughening effect.

Description

TECHNICAL FIELD

[0001] The application is a PC / ABS composite material with spray-free matt effect and a preparation method and application thereof, and belongs to the technical field of high polymer materials. BACKGROUND

[0002] PC / ABS alloy is an engineering plastic with excellent performance, and the PC component endows the PC / ABS composite material with high heat resistance, high strength and high toughness, the ABS component endows the PC / ABS composite material with good processability, solves the stress cracking problem of PC, and improves the solvent resistance of PC.

[0003] Due to excellent physical properties, PC / ABS composite materials are widely used in various fields, especially in the field of automobiles. They are widely used in interior and exterior trim parts such as automobile instrument panels, door handles, reading lamp housings, vehicle lamps and spoilers. In order not to affect safe driving and relieve visual fatigue, matt materials are widely used in interior decoration.

[0004] At present, a good matt effect is mainly obtained by spraying matt paint on the surface of the workpiece. Secondary paint spraying processing not only reduces the qualified rate of products, but also pollutes the environment. A spray-free matt PC / ABS composite material not only achieves excellent matt effect, but also can be recycled and is environmentally friendly.

[0005] Application Publication No.: CN 117924901 A A spray-free ultra-low gloss PC / ABS alloy material and its preparation method, the compatibilizer used is ABS-g-GMA. The use of silica treated with amino silane coupling agent, ABS-g-GMA and succinic anhydride in a compounded manner obtains ultra-low gloss. Very high content of compatibilizer and very high content of matting agent are used to obtain lower surface gloss, the formula is complex. Application Publication No.: CN 117866406 A A low gloss PC / ABS alloy material and its preparation method, the compatibilizer is one or more of core-shell structured acrylate-butadiene-styrene copolymer (MBS), ABS grafted maleic anhydride and PS grafted maleic anhydride. The matting agent used is one or more of core-shell structured cross-linked AS elastomer polymer, ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMA), high molecular weight SAN, nano-silicon dioxide, high mesh talc, styrene-acrylonitrile-acrylic rubber terpolymer and GMA grafted maleic anhydride polymer. All the comparative examples and examples use compatibilizer MBS to obtain compatibilized toughening effect. Application Publication No.: CN 116675968 A A high-flow, impact-resistant, low-gloss PC / ABS material for automotive interior and its preparation method, the compatibilizer is one or a combination of maleic anhydride grafts. Low nitrile, low glue, and high glue particle size ABS 3274 are used to obtain low gloss effect. All examples and comparative examples also use compatibilizers, and some examples also use toughening agents in addition to compatibilizers. Application Publication No.: CN 115895227 A A low gloss PC / ABS flame retardant material and its preparation method, the matting agent used is semi-crosslinked styrene-acrylonitrile copolymer compounded with talc treated with silane coupling agent. The examples use matting agent and talc in a compounded manner to obtain low gloss effect. Application Publication No.: CN 109777070 A An ultra-low gloss PC / ABS resin composition and its preparation method, the low-temperature toughening agent is one or several of non-crosslinking reactive toughening agents (EMA-g-MAH, EMA-g-GMA, EBA-g-MAH, EBA-g-GMA, or thermoplastic styrene elastomer grafted with active functional groups). The coupling agent is one or several of silane coupling agents (amino-functional silane coupling agent, vinyl-functional silane coupling agent, epoxy-functional silane coupling agent, and methacryl-functional silane coupling agent). Non-crosslinking reactive toughening agents and special polymers treated by plasma are used to obtain low gloss effect. Both low-temperature toughening agents and coupling agents are used, and special polymers treated by plasma are used as matting agents, the process is relatively complex.A kind of matte PC / ABS alloy material and its preparation method, the toughening agent (compatibilizer) is at least one of methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-acrylic ester-glycidyl methacrylate terpolymer, maleic anhydride functionalized ethylene-vinyl acetate copolymer, acrylic toughening agent and silicone rubber graft toughening agent. Organic matte agent (amide copolymer, SEBS, gelled SAN, glycidyl methacrylate copolymer) and surface-treated inorganic matte agent (barium sulfate, calcium carbonate, silicon dioxide, kaolin, talc) are used to obtain matte effect. Not only the toughening agent is used, but also the matte agent obtained by compounding organic matte agent and inorganic matte agent to obtain low gloss effect. Application Publication No. CN 110066505 A matte PC / ABS alloy material and its preparation method, the compatibilizer is composed of component A and component B; the component A is polyhedral oligomeric silsesquioxane or hyperbranched polysilicocarbalkane; the component B is graphene oxide or fullerene. The matte agent used is any one or any two of 100-1000 mesh zirconium oxide, 300-4000 mesh talc and 500-1000 mesh calcium silicate combined in any proportion. Two components of compatibilizer are used, matte agent and nanocarbon tube fiber are used, and the process of nanocarbon tube fiber is complex. Application Publication No. CN107298839 A low gloss PC / ABS alloy material and its preparation method, the matte agent used includes at least one of reactive matte agent and non-reactive matte agent, wherein the reactive matte agent is AS-g-GMA, and the non-reactive matte agent is ultra-high molecular weight styrene-acrylonitrile copolymer. The surface gloss of the material is too high. Application Publication No. CN 104098884 A low gloss PC / ABS alloy for automotive interior, the compatibilizer used is maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer. The first matting agent (ultra-fine talc) and the second matting agent (the composite mass ratio of maleic anhydride grafted styrene-butadiene-styrene copolymer and fumed silica is 7:3) are compounded to obtain low gloss effect. Not only the compatibilizer is used alone, but also the matting effect is obtained by compounding the first matting agent and the second matting agent, and the surface gloss is much higher than that obtained by the present patent technology. Application Publication No. CN 103937271 A matte spray-free polycarbonate / acrylonitrile-butadiene-styrene alloy and its preparation method, the incompatibility of ACS and PC-g-EVA makes the PC / ABS alloy have matte effect, and the addition of inorganic powder silicon dioxide makes the PC / ABS alloy have matte effect.Its main components are PC-g-EVA and ABS, and PC resin is not used, and ACS and silica are used to obtain the effect of matte. Application publication number: CN102382348 A reaction extrusion matte agent, low gloss PC / ABS alloy and its preparation method, use high density polyethylene to react with dicumyl peroxide to obtain low gloss PC / ABS alloy material. SUMMARY

[0006] The technical problem solved by the present application is to provide a spray-free PC / ABS composite material with a matte effect. The use of styrene-acrylonitrile-methacrylic acid copolymer (SAMA) not only gives the PC / ABS composite material a lower surface gloss than existing technology, but also gives the PC / ABS composite material a compatible toughening effect. A material has two functions, and also ensures that the heat distortion temperature of the PC / ABS composite material does not decrease. The physical properties of the composite material of the present application are comparable to those of ordinary PC / ABS composite materials, solving the problem of high gloss of ordinary PC / ABS composite materials and the limitation of their use in certain parts. On the basis of meeting the conventional performance requirements of the part, the surface gloss is reduced to meet the requirements of matte extinction. The use of SAMA as a compatibilizer and matting agent has obtained a matte PC / ABS composite material with low gloss, high strength, high cantilever beam notch impact strength and high heat distortion temperature.

[0007] Preferably, a spray-free matte PC / ABS composite material, consisting of the following components by weight:

[0008] Polycarbonate PC: 40.0-80.0 parts;

[0009] ABS: 20.0-60.0 parts;

[0010] Compatibilizer, matting agent: styrene-acrylonitrile-methacrylic acid copolymer SAMA: 1.0-5.0 parts;

[0011] Antioxidant: 0.3-0.6 parts;

[0012] Lubricant: 0.2-1.0 parts.

[0013] The polycarbonate PC has a density of 1.18-1.22 g / cm 3 , a glass transition temperature of 145-150℃, and a corresponding heat distortion temperature of 130-140℃;

[0014] The ABS is an ABS resin with a rubber content of 25%-30%;

[0015] The antioxidant is a compound antioxidant composed of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:2.

[0016] The lubricant is one or a mixture of two or more of pentaerythritol stearate, vinyl distearate, and erucamide.

[0017] Preferably, it is composed of the following components in parts by weight:

[0018] Polycarbonate (PC): 60.0 parts;

[0019] ABS: 34.5 parts;

[0020] SAMA: 5.0 copies

[0021] Antioxidant: 0.3 parts;

[0022] Lubricant: 0.2 parts.

[0023] Preferably, it is composed of the following components in parts by weight:

[0024] PC A1220: 60.0 copies;

[0025] ABS 275: 34.5 parts;

[0026] SAMA S601N: 5.0 copies;

[0027] Antioxidant 1076: 0.1 parts;

[0028] Antioxidant 168: 0.2 parts;

[0029] Lubricant PETS: 0.2 parts.

[0030] To solve the above-mentioned technical problems, another technical solution proposed by the present invention is: a method for preparing a paint-free matte PC / ABS composite material, comprising the following steps:

[0031] (1) Dry the polycarbonate PC at 120°C for 2-4 hours, and control the moisture content of the polycarbonate PC to be below 0.1%;

[0032] (2) Add 40.0-80.0 parts of polycarbonate PC, 20.0-60.0 parts of ABS, 1.0-5.0 parts of compatibilizer and matting agent, 0.3-0.6 parts of antioxidant and 0.2-1.0 parts of lubricant to a mixing pot in sequence and stir at 100-200 rpm for 2-6 minutes to mix evenly to obtain a mixture.

[0033] (3) The mixture is fed into the feed port of the twin-screw extruder through a feed scale and melted and extruded through the twin-screw extruder. After the extruded strip is cooled by a water tank and dehydrated by an air knife, it is cut into cylindrical granules with a diameter of 3-4 mm and a length of 3 mm by a pelletizer.

[0034] (4) After drying the polycarbonate composite material prepared above at 120°C for 2 to 4 hours, it is molded into standard specimens by injection molding and then tested according to the standard.

[0035] Preferably, it includes the following steps:

[0036] (1) Weigh 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of SAMA, 0.3 parts of antioxidant, and 0.2 parts of lubricant;

[0037] (2) Add 60.0 parts of polycarbonate (PC), 34.5 parts of ABS, 5.0 parts of SAMA, 0.3 parts of antioxidant, and 0.2 parts of lubricant from step (1) to a mixing pot in sequence and stir at 100-200 rpm for 2-6 minutes to mix evenly to obtain a mixture. Add the mixture to the feed port of a twin-screw extruder through a feed scale, and melt-extrude it through the twin-screw extruder. After the extruded strip is cooled in a water tank and dehydrated by an air knife, it is cut into cylindrical granules with a diameter of 3-4 mm and a length of 3 mm by a pelletizer.

[0038] To solve the above-mentioned technical problems, another technical solution proposed by the present invention is: the application of paint-free matte PC / ABS composite material, which can be applied to parts with very low surface gloss requirements, and combines low gloss, high strength, high cantilever beam notched impact strength and high heat distortion temperature.

[0039] The application of paint-free matte PC / ABS composite materials can be applied in the automotive field.

[0040] The beneficial effects of this invention are:

[0041] The aforementioned paint-free matte PC / ABS composite material exhibits synergistic effects among its components. Not only do its physical properties reach those of ordinary PC / ABS composite materials, but it also possesses a low surface gloss that ordinary PC / ABS composite materials do not have. Furthermore, its other physical properties are comparable to those of ordinary PC / ABS composite materials, making it suitable for components requiring low surface gloss.

[0042] The material uses styrene-acrylonitrile-methacrylic acid copolymer (SAMA), which can improve the compatibility of PC / ABS composites and reduce the surface gloss of PC / ABS composites. One additive serves two purposes, resulting in lower overall cost and superior physical properties.

[0043] Employing a high-torque co-rotating twin-screw extruder with a powerful motor, high torque, and precise temperature control, ensures efficient power transmission and material stability. The vacuum system effectively removes small molecules from the material or generated during extrusion, guaranteeing the material is free of impurities and possesses stable and high physical properties.

[0044] As can be seen from the strength data of Examples 1-3 and Comparative Examples 1-3, the tensile strength, flexural strength and flexural modulus of the material do not decrease significantly with the increase of SAMA addition, while the tensile strength, flexural strength and flexural modulus of the material decrease slightly with the increase of MBS addition.

[0045] As can be seen from the heat distortion temperature data of Examples 1-3 and Comparative Examples 1-6, the heat distortion temperature of the material does not decrease significantly with the increase of SAMA content, while the heat distortion temperature of the material decreases slightly with the increase of MBS and B-MAT content.

[0046] As can be seen from the surface gloss data of Examples 1-3 and Examples 4-6, for the same amount added, using SAMA results in a lower surface gloss than using B-MAT. Furthermore, from... Figure 1 As can be seen from the surface micrographs of Example 3 and Comparative Example 6, the surface of Example 3 is smooth and regular, while the surface of Comparative Example 6 is rough and irregular, resulting in the presence of yin-yang defects on the surface of Comparative Example 6.

[0047] The notched impact strength of the cantilever beams in Comparative Examples 4 to 6 did not increase significantly with the increase of B-MAT addition, indicating that SAMA has a compatibility toughening effect similar to MBS, while B-MAT does not have a compatibility toughening effect similar to MBS.

[0048] As can be seen from Examples 1-5 and Comparative Examples 1-6, using SAMA as a compatibilizer and matting agent yields a matte PC / ABS composite material that simultaneously possesses low gloss, high strength, high cantilever beam notched impact strength, and high heat distortion temperature. This invention innovatively uses SAMA, achieving not only an excellent matting effect but also eliminating the need for a compatibilizer, while maintaining high material strength and heat distortion temperature.

[0049] Through extensive experimentation by the inventors, it was unexpectedly discovered that SAMA not only reduces the surface gloss of PC / ABS composite materials but also provides compatibility and toughening effects, achieving a combination of the two. Furthermore, Example 3 represents the optimal formulation for a paint-free matte PC / ABS composite material, exhibiting low surface gloss, excellent physical properties, and low material cost.

[0050] In summary, by using SAMA as both a compatibility toughening agent and a matting agent, a paint-free matte PC / ABS composite material was produced, meeting the specific requirements for low surface gloss in certain components. Attached Figure Description

[0051] Figure 1 Microscopic images of the surfaces of Example 3 and Comparative Example 6 Detailed Implementation

[0052] Example 1

[0053] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0054] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 36.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 3.0 parts of SAMA (UMG, grade S601N), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0055] The polycarbonate PC has a density of 1.18–1.22 g / cm³. 3 The glass transition temperature is 145–150℃, and the corresponding heat distortion temperature is 130–140℃.

[0056] The ABS mentioned is a bulk ABS resin with a butadiene rubber content of 25% to 30%;

[0057] (2) Dry the polycarbonate PC at 120℃ for 2-4 hours, and control the moisture content of the polycarbonate PC to be below 0.1%;

[0058] (3) Add 60.0 parts of polycarbonate PC, 36.5 parts of ABS, 3.0 parts of SAMA, 0.1 parts of 1076, 0.2 parts of 168 and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture.

[0059] (4) The mixture is fed into the feed port of the twin-screw extruder through a feed scale, and then melt-extruded through the twin-screw extruder. After being cooled in a water tank and dehydrated by an air knife, the extruded material is cut into cylindrical granules with a diameter of 3-4 mm and a length of 3 mm by a pelletizer. The barrel temperature of the twin-screw extruder is controlled at 200-260℃, and the screw speed is 400-600 rpm.

[0060] The mixture is fed from the extruder feed port through a loss-in-weight scale. The temperature of the extruder is set to 220℃~260℃, the screw speed to 400~600rpm, and the vacuum degree is controlled to <-0.06MPa (see process parameters in Table 1) for extrusion granulation to obtain the matte PC / ABS composite material of Example 1.

[0061] Table 1: Extruder Production Process Parameter Setting Table

[0062]

[0063] Example 2

[0064] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0065] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 35.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 4.0 parts of SAMA (UMG, grade S601N), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0066] (2) Add 60.0 parts of polycarbonate (PC), 35.5 parts of ABS, 4.0 parts of SAMA, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Example 2.

[0067] Example 3

[0068] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0069] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 34.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 5.0 parts of SAMA (UMG, grade S601N), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0070] (2) Add 60.0 parts of polycarbonate (PC), 34.5 parts of ABS, 5.0 parts of SAMA, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Example 3.

[0071] Example 4

[0072] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0073] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 30.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 4.0 parts of SAMA (UMG, grade S601N), 5.0 parts of B-MAT (Crompton), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0074] (2) Add 60.0 parts of polycarbonate (PC), 30.5 parts of ABS, 4.0 parts of SAMA, 5.0 parts of B-MAT, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Example 4.

[0075] Example 5

[0076] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0077] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 26.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 4.0 parts of SAMA (UMG, grade S601N), 5.0 parts of B-MAT (Crompton), 2.0 parts of SiO2 (Shouguang Changtai, grade CT-1032JX), 2.0 parts of MBS (DOW, 2620), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS.

[0078] (2) The following ingredients from step (1) were added sequentially to a mixing tank: 60.0 parts polycarbonate (PC), 26.5 parts ABS, 4.0 parts SAMA, 5.0 parts B-MAT, 2.0 parts SiO2, 2.0 parts MBS, 0.1 parts 1076, 0.2 parts 168, and 0.2 parts PETS. The mixture was stirred at 120 rpm for 3 minutes until homogeneous, yielding a composite material. The composite material was fed into the extruder feed port through a loss-in-weight balance and extruded and granulated according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Example 5.

[0079] The polycarbonate composite material prepared above was dried at 120°C for 2-4 hours and then molded into standard specimens by injection molding, and then tested according to the standard.

[0080] Comparative Example 1

[0081] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0082] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 36.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 3.0 parts of MBS (DOW, grade 2620), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0083] (2) Add 60.0 parts of polycarbonate (PC), 36.5 parts of ABS, 3.0 parts of MBS, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Comparative Example 1.

[0084] Comparative Example 2

[0085] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0086] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 35.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 4.0 parts of MBS (DOW, grade 2620), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0087] (2) Add 60.0 parts of polycarbonate (PC), 35.5 parts of ABS, 4.0 parts of MBS, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Comparative Example 2.

[0088] Comparative Example 3

[0089] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0090] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 34.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 5.0 parts of MBS (DOW, grade 2620), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0091] (2) Add 60.0 parts of polycarbonate (PC), 34.5 parts of ABS, 5.0 parts of MBS, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Comparative Example 3.

[0092] Comparative Example 4

[0093] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0094] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 36.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 3.0 parts of B-MAT (Crompton), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0095] (2) Add 60.0 parts of polycarbonate (PC), 36.5 parts of ABS, 3.0 parts of B-MAT, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Comparative Example 4.

[0096] Comparative Example 5

[0097] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0098] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 35.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 4.0 parts of B-MAT (Crompton), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0099] (2) Add 60.0 parts of polycarbonate (PC), 35.5 parts of ABS, 4.0 parts of B-MAT, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Comparative Example 5.

[0100] Comparative Example 6

[0101] (1) The matte PC / ABS composite material comprises the following components in parts by weight:

[0102] Weigh out 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 34.5 parts of ABS (Gaoqiao Petrochemical, grade 275), 5.0 parts of B-MAT (Crompton), 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS;

[0103] (2) Add 60.0 parts of polycarbonate (PC), 34.5 parts of ABS, 5.0 parts of B-MAT, 0.1 parts of 1076, 0.2 parts of 168, and 0.2 parts of PETS from step (1) to a mixing pot in sequence and stir at 120 rpm for 3 minutes to mix evenly to obtain a mixture. Feed the mixture through the feed port of the extruder using a loss-in-weight balance and extrude and granulate according to the process parameters in Table 1 to obtain the matte PC / ABS composite material of Comparative Example 6.

[0104] The matte PC / ABS composite materials prepared in Examples 1-5 and Comparative Examples 1-6 were dried at 100°C for 2-4 hours and then injection molded into standard specimens. The specimens were then tested according to standards, and the test data are shown in Table 3. Tensile strength was tested according to ISO 527, flexural strength and flexural modulus according to ISO 178, cantilever beam notched impact strength according to ISO 180, heat distortion temperature according to ISO 75, and surface gloss according to ISO 2813.

[0105] Table 2: Formulations of Examples 1-5 and Comparative Examples 1-6

[0106]

[0107] Table 3: Physical properties of Examples 1-5 and Comparative Examples 1-6

[0108]

[0109] The test data of physical properties and gloss of Examples 1-5 and Comparative Examples 1-6 in Table 3 show that:

[0110] The gloss of Examples 1-3 and Comparative Examples 4-6 gradually decreased with increasing amounts of SAMA and B-MAT. However, at the same addition amount, using SAMA resulted in a lower gloss than using B-MAT. Figure 1 As can be seen from the surface micrographs of Example 3 and Comparative Example 6, the surface of Example 3 is smooth and regular, while the surface of Comparative Example 6 is rough and irregular, resulting in the presence of yin-yang defects on the surface of Comparative Example 6.

[0111] The notched impact strength of the cantilever beams in Examples 1-3 gradually increased with the increase of SAMA addition. The notched impact strength of the cantilever beams in Comparative Examples 1-3 gradually increased with the increase of MBS addition. The notched impact strength of the cantilever beams in Comparative Examples 4-6 did not increase significantly with the increase of B-MAT addition. This indicates that SAMA has a compatibility toughening effect similar to MBS, while B-MAT does not have a compatibility toughening effect similar to MBS.

[0112] As can be seen from the strength data of Examples 1-3 and Comparative Examples 1-3, the tensile strength, flexural strength and flexural modulus of the material do not decrease significantly with the increase of SAMA addition, while the tensile strength, flexural strength and flexural modulus of the material decrease slightly with the increase of MBS addition.

[0113] As can be seen from the heat distortion temperature data of Examples 1-3 and Comparative Examples 1-6, the heat distortion temperature of the material does not decrease significantly with the increase of SAMA content, while the heat distortion temperature of the material decreases slightly with the increase of MBS and B-MAT content.

[0114] Data from Examples 4 and 5 show that the combined use of SAMA, B-MAT, and SiO2 results in lower gloss. The addition of SiO2 contributes little to reducing gloss; however, even with an increase of 2.0 parts of toughening agent MBS, the negative impact on the cantilever beam notched impact strength of the material remains significant.

[0115] As can be seen from Examples 1-5 and Comparative Examples 1-6, using SAMA as a compatibilizer and matting agent yields a matte PC / ABS composite material that simultaneously possesses low gloss, high strength, high cantilever beam notched impact strength, and high heat distortion temperature. This invention innovatively uses SAMA, achieving not only an excellent matting effect but also eliminating the need for a compatibilizer, while maintaining high material strength and heat distortion temperature.

[0116] The above examples are merely illustrative of the present invention and do not limit the scope of protection of the present invention. The design concept and the substitution of different grades of raw materials described in this patent are also applicable.

[0117] Changes in generation and quantity are all within the scope of protection of this patent.

Claims

1. A paint-free matte PC / ABS composite material, characterized in that... It consists of the following components in parts by weight: Polycarbonate (PC): 40.0–80.0 parts; Acrylonitrile-butadiene-styrene ABS: 20.0–60.0 parts; Compatibilizer and matting agent: Styrene-acrylonitrile-methacrylic acid copolymer (SAMA): 1.0–5.0 parts; Antioxidant: 0.3–0.6 parts; Lubricant: 0.2–1.0 parts; The polycarbonate PC has a density of 1.18–1.22 g / cm³. 3 The glass transition temperature is 145–150℃, and the corresponding heat distortion temperature is 130–140℃. The ABS mentioned is a bulk ABS resin with a butadiene rubber content of 25% to 30%.

2. The paint-free matte PC / ABS composite material according to claim 1, characterized in that: The antioxidant is a compound antioxidant composed of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:

2. The lubricant is one or a mixture of two or more of pentaerythritol stearate, vinyl distearate, and erucamide.

3. The paint-free matte PC / ABS composite material according to claim 1, characterized in that, It consists of the following components in parts by weight: Polycarbonate (PC): 60.0 parts; Acrylonitrile-butadiene-styrene ABS: 34.5-36.5 parts; Styrene-acrylonitrile-methacrylic acid copolymer (SAMA): 3.0-5.0 parts; Antioxidant: 0.3 parts; Lubricant: 0.2 parts.

4. The paint-free matte PC / ABS composite material according to claim 1, characterized in that, It consists of the following components in parts by weight: Polycarbonate (PC): 60.0 parts; Acrylonitrile-butadiene-styrene ABS: 34.5 parts; Styrene-acrylonitrile-methacrylic acid copolymer (SAMA): 5.0 parts; Antioxidant: 0.3 parts; Lubricant: 0.2 parts.

5. The paint-free matte PC / ABS composite material according to claim 1, characterized in that, It consists of the following components in parts by weight: PC A1220: 60.0 copies; ABS 275: 34.5 parts; SAMA S601N: 5.0 copies; Antioxidant 1076: 0.1 parts; Antioxidant 168: 0.2 parts; Lubricant PETS: 0.2 parts.

6. The method for preparing the paint-free matte PC / ABS composite material according to any one of claims 1-5, characterized in that: Includes the following steps: (1) Dry the polycarbonate PC at 120°C for 2-4 hours, and control the moisture content of the polycarbonate PC to be below 0.1%; (2) Add 40.0-80.0 parts of polycarbonate PC, 20.0-60.0 parts of ABS, 1.0-5.0 parts of compatibilizer and matting agent SAMA, 0.3-0.6 parts of antioxidant and 0.2-1.0 parts of lubricant to a mixing pot in sequence and stir at 100-200 rpm for 2-6 minutes to mix evenly to obtain a mixture. (3) The mixture is fed into the feed port of the twin-screw extruder through a feed scale and melted and extruded through the twin-screw extruder. After the extruded strip is cooled by a water tank and dehydrated by an air knife, it is cut into cylindrical granules with a diameter of 3-4 mm and a length of 3 mm by a pelletizer. The barrel temperature of the twin-screw extruder is controlled at 200-260℃ and the screw speed is 400-600 rpm.

7. The method for preparing the paint-free matte PC / ABS composite material according to claim 6, characterized in that: Includes the following steps: (1) Weigh 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of SAMA, 0.3 parts of antioxidant, and 0.2 parts of lubricant; (2) Add 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of SAMA, 0.3 parts of antioxidant and 0.2 parts of lubricant from step (1) to a mixing pot in sequence and stir at a speed of 100-200 rpm for 2-6 minutes to mix evenly to obtain a mixture. Add the mixture to the feed port of the twin-screw extruder through a feed scale and melt-extrude through the twin-screw extruder. After the extruded strip is cooled by a water tank and dehydrated by an air knife, it is cut into cylindrical granules with a diameter of 3-4 mm and a length of 3 mm by a pelletizer. The barrel temperature of the twin-screw extruder is controlled at 200-260℃ and the screw speed is 400-600 rpm.

8. The application of the paint-free matte PC / ABS composite material according to any one of claims 1-5, characterized in that: It can be applied to parts requiring very low gloss, and is a matte PC / ABS composite material that combines low gloss, high strength, high cantilever beam notched impact strength and high heat distortion temperature.

9. The application of the paint-free matte PC / ABS composite material according to any one of claims 1-5, characterized in that: It can be applied to the automotive industry.

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