Spraying-free matting PC / ABS composite material and preparation method and application thereof

Abstract

The invention relates to a spraying-free PC / ABS (Polycarbonate / Acrylonitrile Butadiene Styrene) composite material with a matting effect as well as a preparation method and application thereof, belonging to the technical field of high polymer materials. The composite material comprises the following components: 30.0-80.0 parts of PC (Poly Carbonate); 10.0 to 60.0 parts of ABS (Acrylonitrile Butadiene Styrene); 1.0 to 5.0 parts of a compatilizer and a matting agent SAMA; 0.3 to 0.6 part of an antioxidant; 0.2 to 1.0 part of a lubricant; the preparation method comprises the following steps: uniformly mixing PC, ABS, SAMA, an antioxidant and a lubricant according to a certain proportion according to a specific process, performing melt extrusion through a twin-screw extruder, cooling through a cooling water tank, removing water through an air knife, and cutting into a cylindrical granular material with the diameter of 3-4mm and the length of 3mm through a granulator. And certain requirements on the extinction requirement on the surface of a workpiece are met. Compared with the prior art, SAMA is creatively used, so that a very good extinction effect is obtained, and meanwhile, the compatible toughening effect is also obtained.

Description

Technical Field

[0001] The present invention relates to a PC / ABS composite material with a matte effect without spraying, a preparation method and an application thereof, belonging to the technical field of polymer materials. Background Art

[0002] The PC / ABS alloy is an engineering plastic with excellent properties. The PC component endows the PC / ABS composite material with high heat resistance, high strength and high toughness, and 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 its excellent physical properties, the PC / ABS composite material is widely used in various fields, especially in the automotive field. It is widely used in interior and exterior trim parts such as automotive instrument panels, door handles, reading lamp housings, vehicle lamps, spoilers, etc. In order not to affect safe driving and relieve visual fatigue, the application of matte materials in interior decoration is very extensive.

[0004] At present, a better matte effect is mainly obtained by spraying matte paint on the surface of the workpiece. The secondary spraying process will not only reduce the qualified rate of the product, but also cause environmental pollution. A matte PC / ABS composite material without spraying can not only achieve excellent matte effect, but also be recycled and is environmentally friendly.

[0005] Publication No. of the application: CN 117924901 A. An unpainted ultra-low gloss PC / ABS alloy material and its preparation method, with the compatibilizer being ABS-g-GMA. The ultra-low gloss is obtained by compounding silica treated with an amino silane coupling agent, ABS-g-GMA, and succinic anhydride. A relatively low surface gloss is obtained only by using a very high content of compatibilizer and a very high content of matting agent, and the formulation is complex. Publication No. of the application: CN 117866406 A. A low gloss PC / ABS alloy material and its preparation method, where the compatibilizer is a core-shell structured acrylate-butadiene-styrene copolymer (MBS), one or more of ABS grafted maleic anhydride and PS grafted maleic anhydride. The matting agent used is one or more of a core-shell structured crosslinked AS elastomer polymer, ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMA), high molecular weight SAN, nano silica, high mesh number talc powder, and a terpolymer copolymer of styrene-acrylonitrile-acrylic rubber and a GMA grafted maleic anhydride polymer. All comparative examples and examples use the compatibilizer MBS to obtain the effect of compatibilization and toughening. Publication No. of the application: CN 116675968 A. A high-flow, impact-resistant, low gloss PC / ABS material for automotive interiors and its preparation method, where the compatibilizer is one or several combinations of maleic anhydride grafted products. The low gloss effect is obtained by using ABS 3274 with low nitrile, low gum, and high gum particle size. All examples and comparative examples also use a compatibilizer, and some examples also use a toughening agent in addition to the compatibilizer. Publication No. of the application: CN 115895227 A. A low gloss PC / ABS flame retardant material and its preparation method, where the matting agent used is a semi-crosslinked styrene-acrylonitrile copolymer compounded with talc powder surface-treated with a silane coupling agent. The examples use the compounding method of the matting agent and talc powder to obtain the low gloss effect. Publication No. of the application: CN 109777070A. An ultra-low gloss PC / ABS resin composition and its preparation method, where the low-temperature toughening agent is a non-crosslinked reactive toughening agent (one or several of EMA-g-MAH, EMA-g-GMA, EBA-g-MAH, EBA-g-GMA, or a thermoplastic styrene elastomer grafted with an active functional group). The coupling agent is a silane coupling agent (one or several of an amino functional group silane coupling agent, a vinyl functional group silane coupling agent, an epoxy functional group silane coupling agent, and a methacryloyl functional group silane coupling agent). The ultra-low gloss effect is obtained by using a non-crosslinked reactive toughening agent and a special polymer treated by plasma. Both a low-temperature toughening agent and a coupling agent are used, and a special polymer treated by plasma is used as the matting agent, and the process is relatively complex.Publication No. of application: CN 111500042 A A matte PC / ABS alloy material and its preparation method, wherein 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-acrylate-glycidyl methacrylate terpolymer, maleic anhydride-functionalized ethylene-vinyl acetate copolymer, acrylic toughening agent and silicone rubber graft toughening agent. A matte effect is obtained by using an organic matte agent (amide copolymer, SEBS, gelled SAN, glycidyl methacrylate copolymer) and a surface-treated inorganic matte agent (barium sulfate, calcium carbonate, silica, kaolin, talc). A low gloss effect is obtained not only by using a toughening agent but also by using a matte agent prepared by compounding an organic matte agent and an inorganic matte agent. Publication No. of application: CN 110066505 A Matte PC / ABS alloy material and its preparation method, wherein the compatibilizer consists of component A and component B; component A is polyhedral oligomeric silsesquioxane or hyperbranched polysilcarbosilane; component B is graphene oxide or fullerene. The matte agent used is a composite matte agent composed of any one or any two of zirconia with a particle size of 100-1000 mesh, talc with a particle size of 300-4000 mesh and calcium silicate with a particle size of 500-1000 mesh in any proportion. A compatibilizer composed of two components is used, and a matte agent and carbon nanotube fibers are used, wherein the manufacturing process of the carbon nanotube fibers is complex. Publication No. of application: CN107298839 A Low gloss PC / ABS alloy material and its preparation method, wherein the matte agent used includes at least one of a reactive matte agent and a 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. Publication No. of application: CN 104098884 A A low gloss PC / ABS alloy for automotive interior, wherein the compatibilizer used is maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer. A low gloss effect is obtained by compounding a first matting agent (ultrafine talc) and a second matting agent (the composite mass ratio of maleic anhydride grafted styrene-butadiene-styrene copolymer and fumed silica is 7:3). A matting effect is obtained not only by using the compatibilizer alone but also by compounding the first matting agent and the second matting agent, and its surface gloss is much higher than the surface gloss obtained by the present patent technology. Publication No. of application: CN 103937271 A Matte spray-free polycarbonate / acrylonitrile-butadiene-styrene alloy and its preparation method, making the PC / ABS alloy have a matte effect by the incompatibility of ACS and PC-g-EVA, and adding inorganic powder silica at the same time to make the PC / ABS alloy have a matte effect.Its main components are PC-g-EVA and ABS, without using PC resin, and using the compound of ACS and silica to obtain a matte effect. Application Publication No.: CN102382348 A Reaction Extrusion Matting Agent, Low-Gloss PC / ABS Alloy and Its Preparation Method, using high-density polyethylene and dicumyl peroxide to react and extrude a matting agent to obtain a low-gloss PC / ABS alloy material. Summary of the Invention

[0006] The technical problem solved by the present invention is: to propose a spray-free PC / ABS composite material with a matting effect. Using styrene-acrylonitrile-methacrylic acid copolymer (SAMA) not only gives the PC / ABS composite material a lower surface gloss than the prior art, but also gives the PC / ABS composite material a compatibilizing and toughening effect. One 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 invention are equivalent to those of ordinary PC / ABS composite materials, solving the problems of high gloss of ordinary PC / ABS composite materials and limited use on specific parts, reducing the surface gloss on the basis of meeting the conventional performance requirements of the parts, and meeting the requirements of matting. Using SAMA as a compatibilizer and a matting agent, a matting PC / ABS composite material with low gloss, high strength, high notched Izod impact strength and high heat distortion temperature is obtained.

[0007] Preferably, a spray-free matting PC / ABS composite material is composed of the following components in parts by weight:

[0008] Polycarbonate PC: 40.0 - 80.0 parts;

[0009] ABS: 20.0 - 60.0 parts;

[0010] Compatibilizer and 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 °C, and a corresponding heat distortion temperature of 130 - 140 °C;

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

[0015] The antioxidant is a composite antioxidant prepared by compounding a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:2.

[0016] The lubricant is one or a mixture of two or more of pentaerythritol stearate, vinyl bisstearamide, 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 parts

[0021] Antioxidant: 0.3 part;

[0022] Lubricant: 0.2 part.

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

[0024] PC A1220: 60.0 parts;

[0025] ABS 275: 34.5 parts;

[0026] SAMA S601N: 5.0 parts;

[0027] Antioxidant 1076: 0.1 part;

[0028] Antioxidant 168: 0.2 part;

[0029] Lubricant PETS: 0.2 part.

[0030] To solve the above technical problems, another technical solution proposed by the present invention is: The preparation method of the spray-free matte PC / ABS composite material includes the following steps:

[0031] (1) Dry the polycarbonate PC at 120 °C for 2 - 4 h, and control the moisture content in 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, a compatibilizer, 1.0 - 5.0 parts of a matting agent, 0.3 - 0.6 parts of an antioxidant, and 0.2 - 1.0 parts of a lubricant into a stirring pot in sequence, and stir for 2 - 6 minutes at a rotation speed of 100 - 200 rpm to mix evenly to obtain a mixed material;

[0033] (3) The mixed materials are added into the feeding port of a twin-screw extruder through a feeding scale, melted and extruded by the twin-screw extruder. The extruded strip is cooled in a water bath and dewatered by an air knife, and then cut into cylindrical pellet materials with a diameter of 3 - 4 mm and a length of 3 mm by a pelletizer.

[0034] (4) The polycarbonate composite material prepared above is dried at 120 °C for 2 - 4 h, and then made into standard test specimens by an injection molding machine and tested according to the standards.

[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 part of antioxidant, and 0.2 part of lubricant.

[0037] (2) Add 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of SAMA, 0.3 part of antioxidant, and 0.2 part of lubricant in step (1) above into a stirring pot in sequence, and stir at a speed of 100 - 200 rpm for 2 - 6 minutes to mix evenly, obtaining mixed materials. The mixed materials are added into the feeding port of a twin-screw extruder through a feeding scale, melted and extruded by the twin-screw extruder. The extruded strip is cooled in a water bath and dewatered by an air knife, and then cut into cylindrical pellet materials with a diameter of 3 - 4 mm and a length of 3 mm by a pelletizer.

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

[0039] The application of the spray-free matte PC / ABS composite material can be applied to the automotive field.

[0040] The beneficial effects of the present invention:

[0041] For the described spray-free matte PC / ABS composite material, each component plays a synergistic role. Not only can its physical properties reach those of ordinary PC / ABS composite materials, but it also has a low surface gloss that ordinary PC / ABS composite materials do not have, and other physical properties are also comparable to those of ordinary PC / ABS composite materials, being suitable for parts with low surface gloss requirements.

[0042] Using styrene-acrylonitrile-methyl methacrylate copolymer (SAMA) as the material can not only improve the compatibility of the PC / ABS composite material but also reduce the surface gloss of the PC / ABS composite material. One additive has two functions, so the comprehensive cost is lower and it has more excellent physical properties.

[0043] A high-torque co-rotating twin-screw extruder is adopted, with a large motor power, high torque, and precise temperature control, ensuring the transmission power of the extruder and the stability of the materials. The vacuum system can effectively extract small-molecule substances generated in the materials or during the extrusion process, ensuring that the materials do not contain small-molecule impurities and enabling the materials to have stable and high physical properties.

[0044] From the strength data of Examples 1 to 3 and Comparative Examples 1 to 3, it can be seen that as the addition amount of SAMA increases, the tensile strength, flexural strength, and flexural modulus of the materials basically do not decrease. However, as the addition amount of MBS increases, the tensile strength, flexural strength, and flexural modulus of the materials all show a slight decrease.

[0045] From the heat distortion temperature data of Examples 1 to 3 and Comparative Examples 1 to 6, it can be seen that as the addition amount of SAMA increases, the heat distortion temperature of the materials basically does not decrease. However, as the addition amounts of MBS and B-MAT increase, the heat distortion temperature of the materials will show a slight decrease.

[0046] From the surface glossiness data of Examples 1 to 3 and Examples 4 to 6, it can be seen that at the same addition amount, using SAMA can obtain a lower surface glossiness than using B-MAT. And from Figure 1 the surface micrographs of Example 3 and Comparative Example 6, it can be seen that the surface of Example 3 is smooth and regular, while the surface of Comparative Example 6 is rough and irregular, resulting in the defect of yin-yang surface on the surface of Comparative Example 6.

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

[0048] From Examples 1 to 5 and Comparative Examples 1 to 6, it can be seen that by using SAMA as a compatibilizer and matting agent, a matting PC / ABS composite material with low gloss, high strength, high notched Izod impact strength, and high heat distortion temperature is obtained. The innovative use of SAMA in the present invention not only achieves a very excellent matting effect but also eliminates the use of a compatibilizer, maintaining the high strength and heat distortion temperature of the materials.

[0049] Through a large number of experiments carried out by the inventors, it is unexpectedly found that SAMA not only has the effect of reducing the surface glossiness of the PC / ABS composite material but also has a compatibilizing and toughening effect, realizing the combination of the two effects. At the same time, Example 3 is the best formulation for the spray-free matting PC / ABS composite material, with low surface glossiness, excellent physical properties, and low material cost.

[0050] In summary, by using SAMA as both a compatibilizing toughening agent and a matting agent, a spray-free matting PC / ABS composite material has been produced, meeting the special requirements of specific components for low surface gloss. Description of the Drawings

[0051] Figure 1 : Surface microscope images of Example 3 and Comparative Example 6 Detailed Description of the Invention

[0052] Example 1

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

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

[0055] The polycarbonate PC has a density of 1.18 - 1.22 g / cm 3 , a glass transition temperature of 145 - 150 °C, and a corresponding heat distortion temperature of 130 - 140 °C;

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

[0057] (2) Dry the polycarbonate PC at 120 °C for 2 - 4 h, and control the moisture content in 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 part of 1076, 0.2 part of 168, and 0.2 part of PETS in step (1) above into a stirring pot in sequence, and stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, obtaining a mixed material.

[0059] (4) Add the mixed material into the feeding port of a twin-screw extruder through a feeding scale, and melt and extrude it through the twin-screw extruder. After the extruded strip is cooled in a water bath and dewatered by an air knife, it is cut into cylindrical pellet materials 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 °C, and the screw rotation speed is 400 - 600 rpm.

[0060] The mixed materials are fed through a loss-in-weight scale into the feeding port of the extruder. The temperature of the extruder is set in zones at 220°C to 260°C, the screw speed is 400 to 600 rpm, and the vacuum degree is controlled to be < -0.06 MPa (see the process parameters in Table 1) for extrusion granulation, thus obtaining the matte PC / ABS composite material of Example 1.

[0061] Table 1: Setting Table of Extruder Production Process Parameters

[0062]

[0063] Example 2

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

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

[0066] (2) Add the 60.0 parts of polycarbonate PC, 35.5 parts of ABS, 4.0 parts of SAMA, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS in step (1) into a stirring pot in sequence and stir at a speed of 120 rpm for 3 minutes to mix evenly, obtaining mixed materials. The mixed materials are fed through a loss-in-weight scale into the feeding port of the extruder and granulated by extrusion according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Example 2.

[0067] Example 3

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

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

[0070] (2) Add the 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of SAMA, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS in step (1) into a stirring pot in sequence and stir at a speed of 120 rpm for 3 minutes to mix evenly, obtaining mixed materials. The mixed materials are fed through a loss-in-weight scale into the feeding port of the extruder and granulated by extrusion according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Example 3.

[0071] Example 4

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

[0073] Weigh 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 30.5 parts of ABS (Gaogiao Petrochemical, grade 275), 4.0 parts of SAMA (UMG, grade S601N), 5.0 parts of B-MAT (Crompton), 0.1 part of 1076, 0.2 part of 168, and 0.2 part 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 part of 1076, 0.2 part of 168, and 0.2 part of PETS in the above step (1) into a stirring pot in sequence, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, and obtain a mixed material. The mixed material is fed from the feeding port of the extruder through a loss-in-weight feeder, and granulated by extrusion according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Example 4.

[0075] Example 5

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

[0077] Weigh 60.0 parts of polycarbonate PC (Wanhua Chemical, grade A1220), 26.5 parts of ABS (Gaogiao 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 part of 1076, 0.2 part of 168, and 0.2 part of PETS;

[0078] (2) Add 60.0 parts of polycarbonate PC, 26.5 parts of ABS, 4.0 parts of SAMA, 5.0 parts of B-MAT, 2.0 parts of SiO2, 2.0 parts of MBS, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS in the above step (1) into a stirring pot in sequence, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, and obtain a mixed material. The mixed material is fed from the feeding port of the extruder through a loss-in-weight feeder, and granulated by extrusion according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Example 5.

[0079] Dry the prepared polycarbonate composite material at 120 °C for 2 - 4 h, then make it into standard specimens with an injection molding machine and test according to the standard.

[0080] Comparative Example 1

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

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

[0083] (2) Add the 60.0 parts of polycarbonate PC, 36.5 parts of ABS, 3.0 parts of MBS, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS in step (1) above to a stirring pot in sequence, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, obtaining a mixed material. The mixed material is fed from the feeding port of the extruder through a loss-in-weight scale and pelletized by extrusion according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Comparative Example 1.

[0084] Comparative Example 2

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

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

[0087] (2) Add the 60.0 parts of polycarbonate PC, 35.5 parts of ABS, 4.0 parts of MBS, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS in step (1) above to a stirring pot in sequence, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, obtaining a mixed material. The mixed material is fed from the feeding port of the extruder through a loss-in-weight scale and pelletized by extrusion according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Comparative Example 2.

[0088] Comparative Example 3

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

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

[0091] (2) Add 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of MBS, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS to the stirring pot in sequence as described in step (1) above, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, and obtain a mixed material. The mixed material is fed through a loss-in-weight feeder from the feed port of the extruder and pelletized according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Comparative Example 3.

[0092] Comparative Example 4

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

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

[0095] (2) Add 60.0 parts of polycarbonate PC, 36.5 parts of ABS, 3.0 parts of B-MAT, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS to the stirring pot in sequence as described in step (1) above, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, and obtain a mixed material. The mixed material is fed through a loss-in-weight feeder from the feed port of the extruder and pelletized according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Comparative Example 4.

[0096] Comparative Example 5

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

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

[0099] (2) Add 60.0 parts of polycarbonate PC, 35.5 parts of ABS, 4.0 parts of B-MAT, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS to the stirring pot in sequence as described in step (1) above, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, and obtain a mixed material. The mixed material is fed through a loss-in-weight feeder from the feed port of the extruder and pelletized according to the process parameters in Table 1, thus obtaining the matte PC / ABS composite material of Comparative Example 5.

[0100] Comparative Example 6

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

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

[0103] (2) Add 60.0 parts of polycarbonate PC, 34.5 parts of ABS, 5.0 parts of B-MAT, 0.1 part of 1076, 0.2 part of 168, and 0.2 part of PETS in the above step (1) to a stirring pot in sequence, stir for 3 minutes at a rotation speed of 120 rpm to mix evenly, and obtain a mixed material. The mixed material is fed from the feeding port of an extruder through a loss-in-weight feeder, and is extruded and pelletized according to the process parameters in Table 1, thus obtaining the matting PC / ABS composite material of Comparative Example 6.

[0104] Dry the matting PC / ABS composite materials prepared in the above Examples 1 to 5 and Comparative Examples 1 to 6 at 100 °C for 2 - 4 h, then use an injection molding machine to make standard test specimens, and conduct tests according to the standards. The test data are shown in Table 3. The tensile strength is tested according to ISO 527, the flexural strength and flexural modulus are tested according to ISO 178, the Izod notched impact strength is tested according to ISO 180, the heat distortion temperature is tested according to ISO75, and the surface glossiness is tested according to ISO2813 standard.

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

[0106]

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

[0108]

[0109] From the test data of the physical properties and glossiness of Examples 1 to 5 and Comparative Examples 1 to 6 in Table 3, it can be seen that:

[0110] The glossiness of Examples 1 to 3 and Comparative Examples 4 to 6 gradually decreases with the increase of the addition amounts of SAMA and B-MAT. However, at the same addition amount, using SAMA can obtain a lower glossiness than using B-MAT; and from Figure 1 The surface micrographs of Example 3 and Comparative Example 6 show that the surface of Example 3 is smooth and regular, while the surface of Comparative Example 6 is rough and irregular, resulting in the defect of yin-yang surface on the surface of Comparative Example 6.

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

[0112] From the strength data of Examples 1 to 3 and Comparative Examples 1 to 3, it can be seen that with the increase in the addition amount of SAMA, the tensile strength, flexural strength, and flexural modulus of the material basically do not decrease, while with the increase in the addition amount of MBS, the tensile strength, flexural strength, and flexural modulus of the material all decrease slightly.

[0113] From the heat distortion temperature data of Examples 1 to 3 and Comparative Examples 1 to 6, it can be seen that with the increase in the addition amount of SAMA, the heat distortion temperature of the material basically does not decrease, while with the increase in the addition amount of MBS and B-MAT, the heat distortion temperature of the material will decrease slightly.

[0114] From the data of Examples 4 to 5, it can be seen that the combined use of SAMA, B-MAT, and SiO2 can obtain a lower gloss. The contribution of the addition of SiO2 to reducing the gloss is relatively small, and instead, on the basis of adding 2.0 parts of the toughening agent MBS, the negative impact on the notched Izod impact strength of the material is still very large.

[0115] From Examples 1 to 5 and Comparative Examples 1 to 6, it can be seen that by using SAMA as a compatibilizer and matting agent, a matting PC / ABS composite material with low gloss, high strength, high notched Izod impact strength, and high heat distortion temperature is obtained. The innovative use of SAMA in the present invention not only obtains a very excellent matting effect, but also eliminates the use of a compatibilizer and maintains a relatively high strength and heat distortion temperature of the material.

[0116] The above are only examples listed to illustrate the present invention, and its content does not limit the scope protected by the present invention. Changes in the design concept described in this patent, substitution of different grades of raw materials

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

Claims

1. A spray-free matte PC / ABS composite material, characterized in that : It is composed 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, 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 to 1.22 g / cm 3 , the glass transition temperature is 145-150°C, and the corresponding heat deformation temperature is 130-140°C; The ABS is a bulk ABS resin with a butadiene rubber mass content of 25% to 30%.

2. The spray-free matte PC / ABS composite material according to claim 1, characterized in that: The antioxidant is a composite antioxidant prepared by mixing a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:2; The lubricant is one of pentaerythritol stearate, vinyl bisstearic acid amide and erucic acid amide or a mixture of two or more thereof.

3. The spray-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 spray-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 spray-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 parts; ABS 275: 34.5 copies; SAMA S601N: 5.0 parts; Antioxidant 1076: 0.1 part; Antioxidant 168: 0.2 parts; Lubricant PETS: 0.2 parts.

6. The method for preparing the spray-free matte PC / ABS composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Dry the polycarbonate PC at 120°C for 2 to 4 hours to control the moisture content in the polycarbonate PC to 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 into a stirring pot in sequence, stir at a speed of 100-200 rpm for 2-6 minutes to mix evenly, and obtain a mixed material; (3) The mixed material is added to the feeding port of the twin-screw extruder through a feed scale, melted and extruded through the twin-screw extruder, and the extruded material strips are cooled in a water trough and dehydrated with an air knife, and then cut into cylindrical granular materials with a diameter of 3 to 4 mm and a length of 3 mm by a pelletizer; the barrel temperature of the twin-screw extruder is controlled at 200 to 260° C., and the screw speed is 400 to 600 rpm.

7. The method for preparing the spray-free matte PC / ABS composite material according to claim 6, characterized in that: The following steps are involved: (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) 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 in the above step (1) are added to a stirring pot in sequence and stirred at a speed of 100 to 200 rpm for 2 to 6 minutes to obtain a mixed material; the mixed material is added to the feeding port of a twin-screw extruder through a feeding scale, melt-extruded through the twin-screw extruder, and the extruded material strips are cooled in a water tank and dehydrated with an air knife, and then cut into cylindrical granular materials with a diameter of 3 to 4 mm and a length of 3 mm by a pelletizer; the barrel temperature of the twin-screw extruder is controlled at 200 to 260° C., and the screw speed is 400 to 600 rpm.

8. Application of the spray-free matte PC / ABS composite material prepared according to any one of claims 1 to 7, characterized in that: It can be applied to parts with very low surface gloss requirements. It is a matte PC / ABS composite material with low gloss, high strength, high Izod notched impact strength and high heat deformation temperature.

9. Application of the spray-free matte PC / ABS composite material prepared according to any one of claims 1 to 7, characterized in that: Can be used in the automotive field.

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