Low-carbon-emission pc / abs alloy material and preparation method thereof

Abstract

The application provides a low-carbon emission PC / ABS alloy material and a preparation method thereof, and relates to the technical field of polycarbonate materials.The application comprises the following raw materials in parts by mass: PCR polycarbonate material 40-70 parts; polycarbonate powder 3-27 parts; acrylonitrile-butadiene-styrene copolymer 8-20 parts; silicone oil 0.2-2 parts; flame retardant 8-20 parts; toughening agent 3-7 parts; additive 1-4 parts; mineral 0.5-2 parts; acid remover 0.1-0.5 parts; and pigment 0-3 parts.The notched impact strength of the PC / ABS alloy material reaches 50-58kJ / m 2 , the odor is 2.5-3.5 levels, and the appearance is defect-free.

Description

Technical Field

[0001] This invention relates to the field of polycarbonate materials technology, specifically to a low-carbon emission PC / ABS alloy material and its preparation method. Background Technology

[0002] Increasing the use of PCR materials is an effective way to reduce energy consumption. PCR stands for Post-Consumer Recycled material, which refers to the recycling of consumer plastics such as PET, PE, PP, HDPE, and other waste plastics generated from common consumer products such as lunch boxes, shampoo bottles, mineral water bottles, and washing machine drums. These recycled materials are then processed into plastic raw materials for manufacturing new materials.

[0003] PC / ABS alloy, a blend of polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS), is a thermoplastic plastic made by blending polycarbonate and acrylonitrile-butadiene-styrene copolymer. It combines the excellent properties of both materials: the moldability of ABS and the mechanical properties, impact strength, temperature resistance, and UV resistance of PC. It is widely used in automotive interior parts, commercial machines, communication equipment, home appliances, and lighting equipment. Therefore, the annual consumption of PC / ABS alloy is enormous, resulting in significant energy consumption. To reduce energy consumption, existing technologies use recycled polycarbonate (PCR polycarbonate) to prepare PC / ABS alloy. While this reduces energy consumption, the repeated processing of PCR polycarbonate leads to severe degradation and aging, resulting in poor mechanical properties, strong odor, and a silvery appearance in PC / ABS alloys, thus affecting their usability. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a low-carbon emission PC / ABS alloy material and its preparation method, solving the problems of strong odor, poor performance, and silver streaks in the appearance of PC / ABS alloy products made from recycled polycarbonate materials.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A low-carbon emission PC / ABS alloy material, comprising the following raw materials in parts by weight:

[0009]

[0010] Preferably, the silicone oil is selected from phenolic hydroxyl silicone oil, wherein the phenolic hydroxyl silicone oil has a molecular weight of 900-2000 and a phenolic hydroxyl content of 0.2-0.5%.

[0011] Preferably, the flame retardant is selected from one or more of bromine-based flame retardants, silicon-based flame retardants, and phosphorus-based flame retardants; the molecular weight of the flame retardant is 300-1000.

[0012] Preferably, the mineral is selected from one or a mixture of more than one of calcium carbonate, talc, barium sulfate, and wollastonite, with talc being the most preferred.

[0013] Preferably, the polycarbonate is prepared by the phosgene method and has a number average molecular weight of 20,000-40,000.

[0014] Preferably, the toughening agent is selected from at least one of octene-ethylene copolymer grafted maleic anhydride, methyl methacrylate-butadiene-styrene graft copolymer, and core-shell structured silicon-based toughening agents; the core of the core-shell structured silicon-based toughening agent is organosilicon or acrylic acid, and the shell is methyl methacrylate.

[0015] Preferably, the acid-reducing agent is selected from one or a mixture of more than one of sodium bicarbonate, sodium hydroxide, potassium hydroxide, and sodium carbonate, with sodium bicarbonate being the most preferred.

[0016] Preferably, the PCR polycarbonate material has a melt index of 10-30 g / 10 min.

[0017] On the other hand, a method for preparing a low-carbon emission PC / ABS alloy material includes the following steps:

[0018] S1. Mix PCR polycarbonate material, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, silicone oil, and pigment to obtain a first premix. Mix the polycarbonate powder, minerals, and acid-reducing agent to obtain a second premix. The mixing temperature is 20-30℃ and the mixing time is 4-10 min.

[0019] S2. The first premix is ​​fed into the main feed port of the twin-screw extruder, the second premix is ​​fed into the first side feed port of the screw barrel of the twin-screw extruder, and the flame retardant is fed into the second side feed port. The mixture is melt-extruded and dried to obtain PC / ABS alloy granules.

[0020] Preferably, in step S2, the length-to-diameter ratio of the twin-screw extruder is 36:1-40:1; the melt extrusion conditions are: zone 1 temperature 80-120℃, zone 2 temperature 190-240℃, zone 3 temperature 190-250℃, zone 4 temperature 190-260℃, zone 5 temperature 190-260℃, zone 6 temperature 190-260℃, zone 7 temperature 190-260℃, zone 8 temperature 190-260℃, zone 9 temperature 190-260℃, and zone 10 temperature 190-260℃; the main engine speed of the twin-screw extruder is 250-600 r / min.

[0021] (III) Beneficial Effects

[0022] This invention provides a low-carbon emission PC / ABS alloy material and its preparation method. Compared with the prior art, it has the following advantages:

[0023] 1. The low-carbon emission PC / ABS alloy material of this invention comprises phenolic hydroxyl silicone oil and PCR polycarbonate material. On the one hand, the highly reactive groups of phenolic hydroxyl silicone oil undergo end-capping and chain extension reactions with the PCR polycarbonate material, increasing the molecular weight of the PCR polycarbonate material. On the other hand, because the PCR polycarbonate molecule is grafted with Si-O bonds, the flexibility of the PCR polycarbonate material is improved. High flexibility reduces the shearing degradation of PCR polycarbonate molecules during processing, thereby reducing the amount of molecular weight reduction of the PCR polycarbonate material. Therefore, the PC / ABS alloy material prepared using the PCR polycarbonate material in this application has good processing performance and mechanical properties. Furthermore, the small molecules such as phenol produced by the degradation of PCR polycarbonate are the source of the unpleasant odor of PC / ABS alloy material. High flexibility can reduce the shearing degradation of PCR polycarbonate molecules during processing, reduce the amount of small molecules such as phenol produced, thereby reducing the odor of the PC / ABS alloy material of this application.

[0024] 2. PCR polycarbonate materials have a high water content, but due to the highly reactive groups of phenolic hydroxyl silicone oil, Si-O bonds are grafted onto PCR polycarbonate, which improves the hydrophobicity of the PCR polycarbonate material. High hydrophobicity reduces the hydrolysis of PCR polycarbonate materials. During hydrolysis, under thermo-oxygen conditions, PCR polycarbonate reacts with oxygen to produce peroxides. The aldehydes, ketones, and other low-molecular-weight substances generated by the dissociation of peroxides and reactions with other free radicals are the source of the unpleasant odor of PC / ABS alloy materials. Therefore, high hydrophobicity can reduce the amount of low-molecular-weight substances with unpleasant odors produced. On the other hand, high hydrophobicity allows more water molecules to evaporate from the exhaust port and act as a stripping agent, carrying away and discharging harmful volatiles escaping from the high-viscosity fluid. This facilitates the volatilization of more low-molecular-weight substances with unpleasant odors inside the PCR polycarbonate material, thereby reducing the odor of the prepared PC / ABS alloy material.

[0025] 3. The low-carbon emission PC / ABS alloy material component of this invention also includes sodium bicarbonate. Sodium bicarbonate can reduce the degradation of phosphate ester flame retardants and increase the effective content of flame retardants. During processing, part of the sodium bicarbonate decomposes to produce CO2 and sodium carbonate, and part reacts with acid to produce CO2. Sodium carbonate then reacts with acid to produce CO2. CO2 acts as a stripping agent, carrying away and emitting harmful volatiles escaping from high-viscosity fluids, thereby reducing the odor of the PC / ABS alloy material.

[0026] 4. This invention provides a method for preparing a low-carbon emission PC / ABS alloy material. By adding appropriate amounts of phenolic hydroxyl silicone oil and an acid-suppressing agent, the amount of PCR PC material added can be increased, significantly reducing carbon emissions. By controlling the amounts of phenolic hydroxyl silicone oil and the acid-suppressing agent, and ensuring that the amount of PCR PC material added is less than or equal to the maximum amount, and under specific feeding conditions, the notched impact strength of the prepared PC / ABS alloy material can reach 50-58 kJ / m. 2 The odor is rated at 2.5-3.5, and the appearance is free of defects. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This application provides a low-carbon emission PC / ABS alloy material and its preparation method, solving the problems of poor mechanical properties, strong odor, and silver streaks in the appearance of PC / ABS alloy materials prepared from PCR polycarbonate materials.

[0029] The technical solution in this application embodiment is to solve the above-mentioned technical problems, and the overall idea is as follows:

[0030] Recycled plastics include PCR and PIR plastics. PCR stands for Post-Consumer Recycled material, referring to recycled consumer plastics such as PET, PE, PP, and HDPE, which are then processed into raw materials for manufacturing new packaging materials. This includes waste plastics from everyday consumer items such as lunch boxes, shampoo bottles, mineral water bottles, and washing machine drums. PIR stands for Post-Industrial Recycled material, referring to materials generated in industrial processes or procedures, commonly known as sprues or waste. Compared to PCR, PIR is easier to process; it can be directly crushed and granulated for reuse. However, PCR plastics are more difficult to process, and the quantity of PCR plastics is far greater than that of PIR plastics. Therefore, how to recycle and reuse PCR plastics is of great significance for energy conservation and emission reduction. Against this background, this application provides a low-carbon emission PC / ABS alloy material and its preparation method.

[0031] The low-carbon emission PC / ABS alloy material of this invention comprises phenolic hydroxyl silicone oil and PCR polycarbonate material. Utilizing the highly reactive groups of the phenolic hydroxyl silicone oil, an end-capping and chain-extending reaction occurs with the PCR polycarbonate material, increasing the molecular weight of the PCR polycarbonate material. In addition, the grafting of Si-O bonds improves the flexibility of the PCR polycarbonate material. High flexibility reduces the shearing degradation of PCR polycarbonate molecules during processing. Therefore, the PC / ABS alloy material of this application has good processing performance and mechanical properties, and low odor.

[0032] In addition, PCR polycarbonate materials have a high water content, but because Si-O bonds are grafted onto PCR polycarbonate, the hydrophobicity of PCR polycarbonate materials is improved. The high hydrophobicity reduces the hydrolysis of PCR polycarbonate materials and allows more water molecules to evaporate from the exhaust port and act as a stripping agent. It carries away and releases harmful volatiles that escape from high-viscosity fluids through a carrying mechanism, which is conducive to the volatilization of more low-molecular-weight substances inside PCR polycarbonate materials, thereby reducing the odor of PC / ABS alloy materials.

[0033] Secondly, the low-carbon emission PC / ABS alloy material of this invention includes sodium bicarbonate. Sodium bicarbonate can reduce the degradation of phosphate ester flame retardants and increase the effective content of flame retardants. During processing, part of the sodium bicarbonate decomposes to produce CO2 and sodium carbonate, and part reacts with acid to produce CO2. Sodium carbonate then reacts with acid to produce CO2. The CO2 acts as a stripping agent, carrying away and emitting harmful volatiles escaping from high-viscosity fluids, thereby reducing the odor of the final material. Since PCR polycarbonate materials inevitably contain moisture, and some hydrolysis inevitably occurs during polycarbonate processing, residual impurities in the PCR polycarbonate material and unreacted Cl residues from PC synthesis are also present. - This causes the system to become acidic after hydrolysis. In an acidic environment, phosphate ester flame retardants will degrade significantly during processing, which will greatly reduce the effective content of flame retardants in the material. The addition of sodium bicarbonate can neutralize the acidity in the material, so that the flame retardant is more in a neutral environment, reducing degradation and increasing the effective content of the flame retardant.

[0034] Because flame retardants are low-molecular-weight substances, their viscosity differs greatly from that of the resin substrate during processing, making them difficult to mix and disperse evenly. The addition of talc powder utilizes the thickening effect of nanoparticles, ensuring uniform mixing and dispersion of the flame retardant and the substrate. The PC / ABS alloy material prepared by this invention exhibits good flame retardant stability, low odor, and a good appearance, and can significantly reduce carbon emissions.

[0035] The method for preparing low-carbon emission PC / ABS alloy material in this application stipulates that the maximum amount of PCR polycarbonate material added is related to the amount of silicone oil and acid-reducing agent as follows:

[0036] Y Max =100-57.5X1-92.5X2, and X1+X2=0.6, X1>0, X2>0.

[0037] Where X1 is the amount of silicone oil used, X2 is the amount of acid-reducing agent used, and Y... Max This represents the maximum amount of PCR PC material that can be added.

[0038] The acid-reducing agent is weakly alkaline, which can cause slight degradation of PC. Excessive addition can lead to further degradation of PC due to unreacted portions, severely impacting the performance of the PC / ABS alloy. Secondly, excessive silicone oil addition can cause severe cross-linking in the molecular chain extension reaction, resulting in poor plasticization during PC material processing and affecting the effective dispersion of other components, especially the toughening agent, thus impacting the toughening effect of the PC / ABS alloy. This application controls the dosage of silicone oil and acid-reducing agent, and ensures that the amount of PCR PC material added is less than or equal to the maximum addition amount. Under specific feeding process conditions, a notched impact strength of 50-58 kJ / m² in the prepared PC / ABS alloy material can be achieved. 2The odor is rated at 2.5-3.5, and the appearance is free of defects.

[0039] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with specific implementation methods.

[0040] In the examples, the PC powder used was Mitsubishi S-2000F (number average molecular weight 20000-25000, melt index 10g / min); the acrylonitrile-butadiene-styrene copolymer ABS used was Shanghai Gaoqiao Petrochemical's 8391; the methyl methacrylate-butadiene-styrene terpolymer used was Rohm and Haas's EXL2690; the PCR polycarbonate (PCR PC) material used was commercially available (melt index 10-30g / 10min); the flame retardant used was Daiba BDP; the silicone oil was commercially available; the additives used were commercially available (168 / 1076 / PTFE = 2 / 1 / 4); the talc powder was HAL 5l, D50 = 0.65um; the sodium bicarbonate was commercially available; and the carbon black was commercially available.

[0041] Example 1

[0042] This embodiment provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1.

[0043] The preparation method of the low-carbon emission PC / ABS alloy material in this embodiment is as follows: PCR polycarbonate material, PC powder, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, and pigment carbon black are added to a high-speed mixer for mixing. The mixing temperature of the high-speed mixer is 30℃ and the mixing time is 4 minutes to obtain a premix. The flame retardant is fed in through the second side inlet, and the mixture is extruded and granulated through shearing and melt plasticizing in a twin-screw extruder. The granulated material is then homogenized in a homogenizing tank, and finally sealed and stored to obtain the final product. PC / ABS alloy granules are produced; the length-to-diameter ratio of the twin-screw extruder is 40:1; the extrusion granulation process parameters are: zone 1 temperature 80℃, zone 2 temperature 240℃, zone 3 temperature 240℃, zone 4 temperature 240℃, zone 5 temperature 220℃, zone 6 temperature 220℃, zone 7 temperature 220℃, zone 8 temperature 220℃, zone 9 temperature 220℃, and zone 10 temperature 240℃; the main extruder speed is 400 r / min, and the vacuum negative pressure is 0.07 MPa.

[0044] Table 1. Raw material formulations for the preparation of PC / ABS alloy materials in Examples 1-4 and Comparative Examples 1-9 (unit: parts)

[0045]

[0046] Example 2

[0047] This embodiment provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1.

[0048] The preparation method of the low-carbon emission PC / ABS alloy material in this embodiment is as follows:

[0049] PCR polycarbonate, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, phenolic hydroxyl silicone oil, and pigment carbon black were put into a high-speed mixer for mixing. The mixing temperature of the high-speed mixer was 30℃ and the mixing time was 4min to obtain the first premix.

[0050] PC powder, talc powder, and acid-reducing agent are added to a low-temperature mixer and mixed at a temperature of 20°C for 8 minutes to obtain a second premix.

[0051] The first premix is ​​fed into the main feed port of the twin-screw extruder, the second premix is ​​fed into the first side feed port, and the flame retardant is fed into the second side feed port. After shearing and melt plasticizing in the twin-screw extruder, the material is extruded and granulated. The granules are then homogenized in a homogenizing tank, and finally sealed and stored to obtain PC / ABS alloy granules. The length-to-diameter ratio of the twin-screw extruder is 40:1. The extrusion granulation process parameters are: zone 1 temperature 80℃, zone 2 temperature 240℃, zone 3 temperature 240℃, zone 4 temperature 240℃, zone 5 temperature 220℃, zone 6 temperature 220℃, zone 7 temperature 220℃, zone 8 temperature 220℃, zone 9 temperature 220℃, and zone 10 temperature 240℃; the main extruder speed is 400 rpm, and the vacuum pressure is 0.07 MPa. Other parameters are selected as in Example 1.

[0052] Example 3

[0053] This embodiment provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1. The preparation method of the low-carbon emission PC / ABS alloy material is the same as in Embodiment 2.

[0054] Example 4

[0055] This embodiment provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1. The preparation method of the low-carbon emission PC / ABS alloy material is the same as in Embodiment 2.

[0056] Comparative Example 1

[0057] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1. The preparation method of the PC / ABS alloy material in Comparative Example 1 differs from that in Example 3 only in that both the first premix and the second premix are added from the main feed port.

[0058] The specific steps are as follows:

[0059] The first and second premixes are added from the main feed port, and the flame retardant is added from the second side feed port. The mixture is extruded and granulated by shearing and melt plasticizing in a twin-screw extruder. The granules are then homogenized in a homogenizing tank and finally sealed and stored to obtain PC / ABS alloy granules. Other parameters and conditions in the preparation method are the same as in Example 3.

[0060] Comparative Example 2

[0061] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1. The only difference between Comparative Example 2 and Example 3 is that the raw materials do not include talc and acid-reducing agents.

[0062] The specific steps are as follows:

[0063] PCR polycarbonate material, PC powder, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, phenolic hydroxyl silicone oil, and pigments were put into a high-speed mixer and mixed. The mixing temperature of the high-speed mixer was 30℃ and the mixing time was 4min to obtain the first premix.

[0064] PC powder was added to a low-temperature mixer and mixed at a temperature of 20°C for 8 minutes to obtain a second premix.

[0065] The first premix is ​​fed into the main feed port of the twin-screw extruder, the second premix is ​​fed into the first side feed port, and the flame retardant is fed into the second side feed port. The mixture is extruded and granulated after shearing and melt plasticizing in the twin-screw extruder. The granulated material is then homogenized in a homogenizing tank and finally sealed and stored to obtain PC / ABS alloy granules. Other parameters and conditions in the preparation method are the same as in Example 3.

[0066] Comparative Example 3

[0067] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1. The only difference between Comparative Example 3 and Example 3 is that the raw materials do not include an acid-reducing agent.

[0068] The specific steps are as follows:

[0069] PCR polycarbonate, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, phenolic hydroxyl silicone oil, and pigments were added to a high-speed mixer and mixed at a mixing temperature of 30°C for 4 minutes to obtain the first premix.

[0070] PC powder and talc powder were added to a low-temperature mixer at a mixing temperature of 20°C for 8 minutes to obtain a second premix. The first premix was fed into the main feed port of a twin-screw extruder, the second premix was fed into the first side feed port, and the flame retardant was fed into the second side feed port. The mixture was extruded and granulated after shearing and melt plasticizing in the twin-screw extruder. The granulated material was then homogenized in a homogenizing tank and finally sealed and stored to obtain PC / ABS alloy granules. Other parameters and conditions in the preparation method were the same as in Example 3.

[0071] Comparative Example 4

[0072] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formula of which is shown in Table 1. The only difference between Comparative Example 4 and Example 3 is that the raw materials do not include talc.

[0073] The specific steps are as follows:

[0074] PCR polycarbonate, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, phenolic hydroxyl silicone oil, and pigments were added to a high-speed mixer and mixed at a mixing temperature of 30°C for 4 minutes to obtain the first premix.

[0075] PC powder and acid-reducing agent were added to a low-temperature mixer at a mixing temperature of 20°C for 8 minutes to obtain a second premix. The first premix was fed into the main feed port of a twin-screw extruder, the second premix was fed into the first side feed port, and the flame retardant was fed into the second side feed port. The mixture was extruded and granulated after shearing and melt plasticizing in the twin-screw extruder. The granulated material was then homogenized in a homogenizing tank and finally sealed and stored to obtain PC / ABS alloy granules. Other parameters and conditions in the preparation method were the same as in Example 3.

[0076] Comparative Example 5

[0077] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formulation of which is shown in Table 1. The only difference between Comparative Example 5 and Example 3 is that the raw materials do not include phenolic hydroxyl silicone oil.

[0078] The specific steps are as follows:

[0079] PCR polycarbonate, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, and pigments were added to a high-speed mixer and mixed at a mixing temperature of 30°C for 4 minutes to obtain the first premix.

[0080] PC powder, talc powder, and acid remover were added to a low-temperature mixer at a mixing temperature of 20°C for 8 minutes to obtain a second premix. The first premix was fed into the main feed port of a twin-screw extruder, the second premix was fed into the first side feed port, and the flame retardant was fed into the second side feed port. The mixture was extruded and granulated after shearing and melt plasticizing in the twin-screw extruder. The granulated material was then homogenized in a homogenizing tank and finally sealed and stored to obtain PC / ABS alloy granules. Other parameters and conditions in the preparation method were the same as in Example 3.

[0081] Comparative Example 6

[0082] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formulation of which is shown in Table 1. The difference between Comparative Example 6 and Example 3 is that the amounts of each component in the formulation are different. In Comparative Example 6, the amount of PCR polycarbonate material added is greater than the maximum amount Y of PC PCR material added. Max The sum of the amounts of phenolic hydroxyl silicone oil and the acid-reducing agent is greater than 0.6. Other aspects are the same as in Example 3.

[0083] Comparative Example 7

[0084] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formulation of which is shown in Table 1. The difference between Comparative Example 7 and Example 3 lies in the different amounts of each component in the formulation. In Comparative Example 7, the amount of PCR polycarbonate material added is greater than the maximum amount Y of PC PCR material added. Max The sum of the amounts of phenolic hydroxyl silicone oil and the acid-reducing agent is greater than 0.6. Other aspects are the same as in Example 3.

[0085] Comparative Example 8

[0086] This comparative example provides a low-carbon emission PC / ABS alloy material, the raw material formulation of which is shown in Table 1. The difference between Comparative Example 8 and Example 3 lies in the different amounts of each component in the formulation. In Comparative Example 8, the amount of PCR polycarbonate material added is greater than the maximum amount Y of PC PCR material added. Max The sum of the amounts of phenolic hydroxyl silicone oil and the acid-reducing agent is greater than 0.6. Other aspects are the same as in Example 3.

[0087] Performance testing

[0088] The properties of the PC / ABS alloy materials prepared in Examples 1-4 and Comparative Examples 1-9 of the present invention were tested, and the results are shown in Table 2.

[0089] The testing method is as follows:

[0090] Notched impact strength of cantilever beam: ISO 179-1;

[0091] Flame retardancy test: UL-94;

[0092] Odor Test: Take an 80g sample and place it in a 5.5L sealed odor bottle. Place it in an oven at 60℃ for 2 hours. When the odor bottle cools to room temperature, slightly remove the cap, place the edge of the bottle between the nose and lips, with the nose 2-3cm away from the bottle opening, and the odorist slowly inhales the gas. Evaluate the odor level and record the results. The higher the value, the stronger the odor. Carbon Emissions: ISO 14067.

[0093] Table 2. Performance test results of the PC / ABS alloy materials prepared in Examples 1-4 and Comparative Examples 1-9.

[0094]

[0095] Carbon emission reduction rate = (P0-P1) / P0×100%;

[0096] P0: Carbon footprint results of 1 kg of PC material without PCR additives

[0097] P1: Carbon footprint results of 1kg of PCR PC material.

[0098] Analyzing Table 2, the amount of PCR PC material added in Example 2 was less than that of Y. Max Example 3 equals Y Max Example 4 is less than Y Max The prepared PC / ABS alloy materials exhibited superior notched impact strength, odor, and appearance. The amounts of PCR PC material added in comparative examples 6, 7, and 8 were all greater than those added to Y. Max The prepared PC / ABS alloy material exhibited poor notched impact strength, odor, and appearance. Therefore, by controlling the amounts of silicone oil, acid neutralizer, and PCR polycarbonate material to be less than or equal to their maximum addition amounts, the prepared PC / ABS alloy material achieved excellent notched impact strength, odor, and appearance.

[0099] Compared with Example 3, Comparative Example 1 feeds the first premix from the main feed port and the second premix from the first side feed port. Compared with both the first and second premixes being fed from the main feed port, the PC / ABS alloy material prepared by the former feeding method has better performance.

[0100] Compared with Example 3, the prepared PC / ABS alloy material in Comparative Example 9 has similar properties such as notched impact strength, odor and appearance. However, the amount of PCR PC material in Example 3 was 62 parts, while that in Comparative Example 9 was only 10 parts. Therefore, phenolic hydroxyl silicone oil and acid-reducing agent can significantly increase the amount of PCR PC material used.

[0101] Compared to Examples 1, 3, 3, and 5, when the amount of PCR PC material added is the same, adding phenolic hydroxyl silicone oil or an acid suppressant alone can improve the notched impact strength and odor properties of the PC / ABS alloy material. However, when both are used together, the notched impact strength and odor properties of the PC / ABS alloy material are even better. Therefore, phenolic hydroxyl silicone oil and an acid suppressant have a synergistic effect in improving the notched impact strength and odor properties of PC / ABS alloy materials.

[0102] As shown in Table 2, the use of PCR PC material significantly reduces carbon emissions, which is of great value for environmental and climate improvement, energy conservation, and emission reduction. Furthermore, the addition of silicone oil, talc, and sodium bicarbonate greatly improves the material's performance, appearance, and odor properties. Example 3 demonstrates the best overall performance, indicating that its processing method and addition ratio are superior to others.

[0103] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-carbon emission PC / ABS alloy material, characterized in that, The raw materials include the following parts by weight: 40-70 portions of PCR polycarbonate material; 3-27 parts of polycarbonate powder; 8-20 parts of acrylonitrile-butadiene-styrene copolymer; Silicone oil 0.2-2 parts; 8-20 parts flame retardant; 3-7 parts toughening agent; 1-4 parts of auxiliary agent; 0.5-2 parts of minerals; 0.1-0.5 parts of acid-reducing agent; 0-3 parts pigment; The silicone oil is selected from phenolic hydroxyl silicone oil, which has a molecular weight of 900-2000 and a phenolic hydroxyl content of 0.2-0.5%. The acid-reducing agent is selected from one or more of sodium bicarbonate, sodium hydroxide, potassium hydroxide, and sodium carbonate; The preparation method of the low-carbon emission PC / ABS alloy material includes the following steps: S1. Mix PCR polycarbonate material, acrylonitrile-butadiene-styrene copolymer, toughening agent, additives, silicone oil, and pigment to obtain a first premix; mix the polycarbonate powder, minerals, and acid-reducing agent to obtain a second premix. S2. The first premix is ​​fed into the main feed port of the twin-screw extruder, the second premix is ​​fed into the first side feed port of the screw barrel of the twin-screw extruder, and the flame retardant is fed into the second side feed port. The mixture is melt-extruded and dried to obtain PC / ABS alloy granules.

2. The low-carbon emission PC / ABS alloy material according to claim 1, characterized in that, The flame retardant is selected from one or more of bromine-based flame retardants, silicon-based flame retardants, and phosphorus-based flame retardants; the molecular weight of the flame retardant is 300-1000.

3. The low-carbon emission PC / ABS alloy material according to claim 1, characterized in that, The mineral is selected from one or a mixture of one or more of calcium carbonate, talc, barium sulfate, and wollastonite.

4. The low-carbon emission PC / ABS alloy material according to claim 1, characterized in that, The polycarbonate powder is prepared by the phosgene method and has a number average molecular weight of 20,000-40,000.

5. The low-carbon emission PC / ABS alloy material according to claim 1, characterized in that, The toughening agent is selected from at least one of octene-ethylene copolymer grafted with maleic anhydride, methyl methacrylate-butadiene-styrene graft copolymer, and core-shell structured silicon-based toughening agents; the core of the core-shell structured silicon-based toughening agent is organosilicon or acrylic acid, and the shell is methyl methacrylate.

6. The low-carbon emission PC / ABS alloy material according to claim 1, characterized in that, The PCR polycarbonate material has a melt index of 10-30 g / 10 min.

7. The low-carbon emission PC / ABS alloy material according to claim 1, characterized in that, In S2, the length-to-diameter ratio of the twin-screw extruder is 36:1-40:1; the melt extrusion conditions are: zone 1 temperature 80-120℃, zone 2 temperature 190-240℃, zone 3 temperature 190-250℃, zone 4 temperature 190-260℃, zone 5 temperature 190-260℃, zone 6 temperature 190-260℃, zone 7 temperature 190-260℃, zone 8 temperature 190-260℃, zone 9 temperature 190-260℃, and zone 10 temperature 190-260℃; the main engine speed of the twin-screw extruder is 250-600 r / min.

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