A composite material using electroplating grade waste ABS recycling and its preparation method

Abstract

The present application belongs to the technical field of composite material recycling and preparation, and relates to a regenerated ABS composite material and a preparation method thereof. The present application composites waste ABS, ASA and AS, improves the chemical resistance and heat resistance of the material through the addition of ASA, and can also maintain a certain mechanical strength of the material, is conducive to maintaining the performance decline of the ABS material in the electroplating process, and composites the AS material, improves the fluidity of the composite, is conducive to reducing the internal stress in the material processing process, improves the electroplating effect, and reflects the content of acrylonitrile in the ABS composite material system, and is conducive to enhancing the adhesion of the electroplated layer.

Description

Technical Field

[0001] This invention belongs to the field of composite material recycling and preparation technology, and relates to a composite material and its preparation method that utilizes recycled and regenerated electroplating-grade waste ABS. Background Technology

[0002] Acrylonitrile-butadiene-styrene copolymer (ABS) is a high-performance polymer material with excellent overall properties. Its composition includes butadiene rubber (PB), which is easily corroded. After electroplating, it achieves good adhesion with the coating, thus giving ABS material a good metallic texture. Electroplated ABS material has advantages such as good corrosion resistance, metallic luster, and aesthetic appeal, and is widely used in various fields.

[0003] However, although there is currently recyclable ABS available for electroplating, it still does not meet the requirements of electroplating-grade ABS. The main reason is that during the life cycle of acrylonitrile-butadiene-styrene copolymer (ABS) parts, the butadiene rubber (PB) ages and its content decreases, and various pollutants in the environment enter the recycling process of waste ABS, resulting in the electroplating effect being far from that of electroplating-grade ABS.

[0004] In existing technologies, electroplating of ABS mainly focuses on the modification of virgin materials. There is no technology for recycling and regenerating waste ABS for electroplating grade. Furthermore, waste ABS suffers from aging of its internal butadiene rubber phase due to long-term use and undergoes different usage and disposal processes throughout its life cycle. Compared to virgin ABS materials, it has a very serious problem of impurity contamination. Currently, there is no method for recycling and preparing waste ABS for electroplating grade. Existing recycled ABS materials often suffer from pitting, bubbles, and poor adhesion when electroplated.

[0005] Chinese patent application document (publication number: CN111875897A) discloses a high-temperature resistant electroplating grade ABS resin and its preparation method. The high-temperature resistant electroplating grade ABS resin comprises the following components in parts by weight: 10-20 parts ABS resin, 25-35 parts ABS high-polymer powder, 40-55 parts highly branched styrene-acrylonitrile copolymer, 10-15 parts heat resistant agent, 0.1-10 parts kaolin, and 0.5-2 parts other additives. By controlling the ABS resin content, blending rubbers of different particle sizes, and introducing kaolin filler, a high-temperature resistant electroplating grade ABS resin is obtained. The high-temperature resistant electroplating grade ABS resin prepared by this invention exhibits excellent high-temperature resistance and electroplating adhesion, reducing the probability of failure of electroplated parts in thermal cycling tests, thereby meeting the application requirements of electroplating grade ABS in the automotive, home appliance, and machinery fields. This invention is a physical blending method for preparing ABS materials using SAN and high-polymer powder. The butadiene rubber content is controlled by adjusting the ratio of SAN and high-polymer powder to achieve an electroplating effect. However, it is completely different from the technology for recycling waste ABS materials, and the technical problems it faces and solves are different.

[0006] Chinese patent application document (publication number: CN104530635A) discloses an ABS material for electroplating, its preparation method, and its application. The ABS material for electroplating comprises the following components by weight: 30-60 parts of ordinary emulsion ABS resin, 15-40 parts of high-flow emulsion ABS resin, 2-10 parts of bulk ABS resin, 8-15 parts of high-rubber powder, 6-12 parts of heat resistant agent, 0.2-0.6 parts of antioxidant, and 0.5-1.5 parts of lubricant. The ABS material for electroplating provided, by adding high-flow emulsion ABS resin and bulk ABS resin, can improve the material's fluidity, processability, and reduce the internal stress of injection-molded parts, achieving better electroplating adhesion and increasing the electroplating yield. This invention's electroplating ABS material combines emulsion ABS and bulk ABS through blending modification; however, the rubber particles in the bulk ABS are relatively large and difficult to corrode during electroplating, negatively impacting the electroplating effect.

[0007] Chinese patent application document (publication number: CN114425829A) discloses a method for preparing modified ABS recycled granules, which mainly includes the following steps: S1 waste sorting; S2 chemical treatment; S3 waste crushing and washing. The waste sorted by chemical treatment in step S2 is crushed by crushing and washing equipment, and then the crushed material is washed by the circulating washing mechanism inside the crushing and washing equipment. Through the cooperation of the spiral conveyor blades and the guide mesh plate that slide up and down inside the vertical pipe, the crushed material inside the arc-shaped washing tank can be stirred and washed. When the upper blade of the spiral conveyor blade slides upward above the upper opening of the vertical pipe, the rotation of the spiral conveyor blade can transport the stirred and washed crushed material upward to the top of the guide mesh plate, so as to realize the secondary spray washing of the washed crushed material, thereby improving the efficient and rapid washing effect of the crushed material. The main invention of this patent is to directly strip the plating and paint from the waste parts, and then directly crush and clean the parts after stripping and paint removal, which improves the cleaning efficiency and the quality of cleaning and recycling. However, in the materials recovered through stripping and paint removal, the butadiene rubber phase is severely corroded, and the materials can no longer be used for electroplating. Summary of the Invention

[0008] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a composite material that utilizes recycled electroplating-grade waste ABS and has good physical properties and electroplating adhesion properties.

[0009] The objective of this invention can be achieved through the following technical solution: a composite material made from recycled electroplating-grade waste ABS, wherein the composite material comprises the following raw materials in parts by weight: 94.0~99.8 parts recycled ABS chips, 0~5.0 parts high-resin powder, 0.1~0.5 parts lubricant, and 0.1~0.5 parts antioxidant.

[0010] In the above-mentioned composite material made from recycled electroplating-grade waste ABS, the high-rubber powder is a core-shell polymer of styrene and acrylonitrile-butadiene rubber, with a rubber content of 55-70%.

[0011] Preferably, the lubricant includes one or more of stearic acid, calcium stearate, paraffin wax, polyethylene wax, oxidized polyethylene wax, pentaerythritol stearate, N,N'-ethylene bis-stearamide, and silicone powder.

[0012] Further preferably, the lubricant is at least one of N,N'-ethylene bis-stearamide and silicone powder.

[0013] Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1098, antioxidant 1035, antioxidant 697, antioxidant BHT 264, and antioxidant DLTP.

[0014] In the above-mentioned composite material made from recycled electroplating-grade waste ABS, the recycled ABS chips are obtained from waste ABS through recycling processes, including collection, sorting, crushing, flotation, washing, impurity removal, drying, and homogenization.

[0015] As a preferred option, waste ABS includes waste ABS components such as pipes, sheets, and coils.

[0016] In the aforementioned composite material recycled from electroplating-grade waste ABS, the recycling process specifically includes the following steps:

[0017] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste plastic parts are removed by a sanding machine to obtain waste plastic parts that have been preliminarily cleaned.

[0018] S2. Then, the waste plastic parts are fed into the crusher for crushing and are screened by the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0019] S3. Waste ABS plastic chips are conveyed to a brine tank by a conveyor auger, where plastic impurities are removed by flotation, and then conveyed to a vertical dewatering machine for centrifugal dewatering to obtain further purified waste ABS plastic chips.

[0020] S4. Send the waste ABS plastic chips to the clean water tank to remove impurities floating on the surface. The waste plastic chips at the bottom are conveyed to the second vertical dewatering machine by the bottom auger for centrifugal dewatering. Hot air is blown into the homogenization tank for homogenization treatment to obtain waste ABS plastic chips.

[0021] In the above-mentioned composite material recycled from electroplating-grade waste ABS, the diameter of the crushed slices is 1~30mm.

[0022] In the aforementioned composite material recycled from electroplating-grade waste ABS, the brine density during flotation is 1.05~1.10 g / cm³. 3 .

[0023] In the aforementioned composite material recycled from electroplating-grade waste ABS, the screen aperture of the crusher's crushing chamber is 10-30 mm, and the screen aperture of the crusher's discharge chamber is 1-30 mm; wherein the screen aperture of the crushing chamber is larger than that of the discharge chamber. This invention utilizes the 10-30 mm screen aperture of the crusher's crushing chamber. When the plastic is crushed to a size smaller than the screen aperture, it passes through the screen aperture in the crushing chamber and falls into the discharge chamber. The screen aperture of the discharge chamber is 1-30 mm. Plastic fragments screened out of the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, dirt, sand, iron filings, and other foreign objects smaller than the screen aperture are screened out during this sliding process. Simultaneously, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the combined action of crushing friction and washing water, contaminants on the surface of the waste ABS material are effectively removed.

[0024] Preferably, the top of the conveyor auger is fitted with clean water. As the material is conveyed upwards, the clean water from the top will flush downwards, washing away powder and foreign matter from the waste ABS sheets.

[0025] In the above-mentioned composite material made from recycled electroplating-grade waste ABS, the screen cylinder of the vertical dewatering machine has a mesh size of 1~5mm and a dewatering rotation speed of 1000~3000rppm.

[0026] Preferably, the brine tank has a bottom agitator to stir the waste ABS chips in the clean water, so that foreign objects in the waste ABS chips can float to the surface better.

[0027] The present invention incorporates impurity removal schemes at each stage of the recycling and pretreatment process to ensure that the recycled waste ABS chips are clean and free of impurities. The entire pretreatment process is a continuous and automated process, which is convenient to operate, highly efficient, and can realize the recycling of electroplating-grade waste ABS chips.

[0028] This invention incorporates a recycling and sorting system to initially remove severely aged and discolored parts, as well as contaminants such as labels, coatings, and foreign matter. Secondly, it employs a water-breaking method, with the crusher featuring dual-layer filtration in both the crushing and discharge chambers. This enhances the crushing and friction cleaning effect, increases filtration and impurity removal capabilities, and significantly improves the efficiency of the water-breaking process. A washing-type conveyor auger further enhances impurity removal. A brine tank effectively removes metal and high-density plastic impurities, improving the material's mechanical properties. A vertical dewatering machine is installed after the brine tank to clean and remove brine from the surface of the waste ABS chips. Simultaneously, centrifugal friction cleaning further separates and removes impurities from the surface of the waste ABS chips. A clear water tank effectively removes floating impurities and further cleans the waste ABS chips. A second vertical dewatering machine further removes impurities and controls moisture. Through these interconnected operational steps, clean and uniform waste ABS chips are obtained.

[0029] A method for preparing the above-mentioned composite material using recycled electroplating-grade waste ABS, the method comprising the following steps:

[0030] S1. Prepare the above-mentioned raw materials;

[0031] S2. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are mixed evenly and then fed into a two-stage screw extruder for melt extrusion granulation.

[0032] This invention provides an integrated solution encompassing the recycling and sorting of waste ABS parts, pretreatment processes, formulation, and standardized granulation equipment and processes. The recycling, sorting, pretreatment, and standardized granulation equipment and processes remove impurities from the waste ABS material that affect electroplating performance layer by layer, completely eliminating the impact of impurities on electroplating results. Furthermore, the addition of high-rubber powder in the formulation adjusts the butadiene content in the waste ABS to between 22% and 24%. Through the combined action of a two-stage screw extruder and lubricant, the high-rubber powder is effectively dispersed within the waste ABS system, achieving optimal electroplating results.

[0033] In the above-mentioned method for preparing a composite material using recycled electroplating-grade waste ABS, the main current of the two-stage screw extruder is controlled between 100 and 140 A, and the temperature of each zone is between 180 and 230 °C. The current of the slave extruder is controlled between 100 and 140 A, and the temperature of each zone is between 200 and 230 °C.

[0034] Preferably, both the main extruder and the slave extruder of the two-stage screw extruder are single screws.

[0035] Further optimization is made by selecting one of the following: a hydraulic dual-column screen changer filter, a hydraulic flat dual-channel screen changer filter, or a four-screen circulating hydraulic screen changer filter.

[0036] Further optimization reveals that the screen changer 2 in the submachine is a chemical fiber screen filter.

[0037] Further optimization is made by using a filter with a mesh size of 150 mesh or higher for screen changer 1 and a filter with a mesh size of 300 mesh or higher for screen changer 2.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The waste plastic parts of the present invention are recycled and processed by an integrated solution of recycling and sorting, pretreatment process, formula and standardized granulation equipment and process. The waste plastic parts are recycled and processed by recycling and sorting, pretreatment process and standardized granulation equipment and process to remove impurities in waste plastic materials that affect the electroplating effect layer by layer, so as to completely avoid the impact of impurities in waste plastic recycling on the electroplating effect.

[0040] 2. This invention uses high-rubber powder to adjust the rubber content in waste ABS, ensuring that the butadiene content in the recycled ABS particles is between 22% and 24%, achieving the best electroplating effect. The use of a two-stage screw extruder not only allows for better homogenization of the high-rubber powder into the ABS system, but also enables more efficient filtration of impurities in the waste ABS through two-stage filtration. In particular, the screen changer 2 uses a chemical fiber filter with a large melt filtration area and a high mesh count, which can greatly improve production efficiency and impurity filtration level. Attached Figure Description

[0041] Figure 1 This is a photograph of the screen cylinder mesh of the vertical dewatering machine in Example 1.

[0042] Figure 2 This is a schematic diagram of the two-stage screw extruder in Example 1. Detailed Implementation

[0043] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] The lubricant is Hangzhou Kaijie Plastic Silicone Powder KJ-B120.

[0045] The antioxidant is BASF's Irganox 1076.

[0046] Example 1:

[0047] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0048] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0049] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 30mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 20mm. Plastic fragments from the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, dirt, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, contaminants on the surface of waste plastic materials are effectively removed.

[0050] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine has a density of 1.10 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0051] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 3000 rpm; the screen cylinder of the vertical dewatering machine has a mesh size such as... Figure 1 The aperture shown is 5mm.

[0052] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0053] S5. Prepare the following raw materials in parts by weight: 97 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0054] S6. Mix the recycled ABS chips, high-polymer powder, lubricant, and antioxidant evenly, then feed them in. Figure 2 The twin-screw extruder shown is used for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the slave extruder is controlled at 120A, and the temperature of each zone is 210℃. Both the main and slave extruders are single-screw extruders. The screen changer 1 in the main extruder is a hydraulic dual-column screen changer filter. The screen changer 2 in the slave extruder is a chemical fiber screen filter. The screen size of the screen changer 1 is 200 mesh, and the screen size of the screen changer 2 is 350 mesh.

[0055] Example 2:

[0056] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0057] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0058] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments from the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, contaminants on the surface of waste plastic materials are effectively removed.

[0059] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0060] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0061] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0062] S5. Prepare the following raw materials in parts by weight: 97 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0063] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0064] Example 3:

[0065] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0066] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0067] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 10mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 5mm. Plastic fragments that come out of the crushing chamber screen slide down the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, the contaminants on the surface of waste plastic materials are effectively removed.

[0068] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.05 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0069] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1000 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 1 mm.

[0070] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0071] S5. Prepare the following raw materials in parts by weight: 97 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0072] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0073] Example 4:

[0074] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0075] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0076] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments from the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, contaminants on the surface of waste plastic materials are effectively removed.

[0077] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0078] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0079] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0080] S5. Prepare the following raw materials in the indicated weight proportions: 94 parts recycled ABS chips, 5 parts high-polymer powder, 0.5 parts lubricant, and 0.5 parts antioxidant.

[0081] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0082] Example 5:

[0083] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0084] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0085] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments from the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, contaminants on the surface of waste plastic materials are effectively removed.

[0086] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0087] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0088] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0089] S5. Prepare the following raw materials in parts by weight: 97 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0090] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0091] Example 6:

[0092] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0093] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0094] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments from the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, contaminants on the surface of waste plastic materials are effectively removed.

[0095] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0096] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0097] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0098] S5. Prepare the following raw materials in parts by weight: 99.8 parts recycled ABS chips, 0 parts high-polymer powder, 0.1 parts lubricant, and 0.1 parts antioxidant.

[0099] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0100] Comparative Example 1:

[0101] S1. The waste ABS plastic parts are fed into the crusher for crushing and are screened by the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0102] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments from the crushing chamber slide through the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. Through the dual action of crushing friction and washing water, contaminants on the surface of waste plastic materials are effectively removed.

[0103] S2. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0104] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0105] S3. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a higher density than water and will sink to the bottom. Other impurities with a lower density than water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0106] S5. Prepare the following raw materials in parts by weight: 97.0 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0107] S4. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-extruder is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-extruders of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic dual-column screen changer filter. The screen changer 2 in the sub-extruder is a chemical fiber screen filter. The screen mesh size of the screen changer 1 is 200 mesh, and the screen mesh size of the screen changer 2 is 350 mesh.

[0108] Comparative Example 2:

[0109] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0110] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0111] The crusher uses a double-layer screen. The screen aperture of the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The discharge chamber is not equipped with a screen. Through the dual action of crushing friction and washing water, the contaminants on the surface of waste plastic materials are effectively removed.

[0112] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0113] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0114] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0115] S5. Prepare the following raw materials in parts by weight: 97 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0116] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0117] Comparative Example 3:

[0118] S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned.

[0119] S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration.

[0120] The crusher uses a double-layer screen. The screen aperture in the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments from the crushing chamber slide down the screen plate in the discharge chamber to the discharge port. Plastic powder, mud, sand, iron filings, and other foreign objects smaller than the screen aperture are screened out during the sliding process. At the same time, no washing water is introduced into the crushing chamber and the discharge chamber from the top of the crusher during crushing.

[0121] S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips.

[0122] The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm.

[0123] S4. The waste plastic chips are sent to a clean water tank. In the clean water tank, ABS has a density greater than that of water and will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to a second vertical dewatering machine through a bottom auger. After two centrifugal dewatering processes, they are blown into a homogenization tank by hot air for homogenization, resulting in pure and uniform recycled ABS plastic chips.

[0124] S5. Prepare the following raw materials in parts by weight: 97.0 parts recycled ABS chips, 2.6 parts high-polymer powder, 0.2 parts lubricant, and 0.2 parts antioxidant.

[0125] S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a twin-screw extruder for melt extrusion granulation. The main current of the twin-screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-screw is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-screws of the twin-screw extruder are single-screw. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-screw is a chemical fiber screen filter. The screen mesh used in screen changer 1 is 200 mesh, and the screen mesh used in screen changer 2 is 350 mesh.

[0126] Comparative Example 4:

[0127] The only difference from Example 2 is that in steps S3 and S4, a vertical dewatering machine is not used; the water is directly fed into the clean water tank.

[0128] Comparative Example 5:

[0129] The difference from Example 2 is that step S5 prepares the following parts by weight of raw materials: 97.4 parts recycled ABS chips, 2.6 parts high-resin powder, 0 parts lubricant, and 0 parts antioxidant.

[0130] The melt index of the recycled ABS composite materials prepared in Examples 1-6 and Comparative Examples 1-5 at 220°C and 10 kg was tested, and the IZOD notched impact at 23°C was evaluated. The application of the recycled ABS composite materials after color plate electroplating was also evaluated.

[0131] Table 1: Performance test results of recycled ABS composite materials prepared in Examples 1-5 and Comparative Examples 1-5

[0132]

[0133] The physical properties of the product of this invention are characterized according to ISO standards for melt flow index and IZOD notched impact. Among them, the appearance requirements are: the effective coating surface is not allowed to have defects such as blistering, protrusion, pitting, peeling, etc., and the surface gloss is uniform and beautiful; the coating adhesion test is carried out in accordance with the national standard GB / T 9286.

[0134] The results show that the melt flow index of Examples 1-6 is between 18 and 23 g / cm³, and the impact strength is 17 or higher, approaching the performance of virgin ABS material. No defects were found in the appearance, and there were no changes in appearance at 65°C and 65% humidity. Furthermore, no coating peeling was observed in the cross-cut test, indicating good electroplating adhesion under suitable temperature and humidity conditions. Additionally, no changes in appearance were observed in the high and low temperature tests (-40~80°C), and no coating peeling was observed in the cross-cut test, demonstrating good resistance to high and low temperatures in the material's electroplating performance. This invention solves the problems of blistering, protrusions, pitting, and peeling that easily occur during electroplating after waste ABS recycling by integrating waste ABS parts recycling and sorting, pretreatment processes, formulations, standardized granulation equipment, and process integration.

[0135] The embodiments herein cover any points not exhaustively within the scope of the technical claims of this invention, as well as new technical solutions formed by equivalent substitutions of one or more technical features in the embodiments. These are all within the scope of the claims of this invention. Furthermore, in all listed or unlisted embodiments of this invention, each parameter in the same embodiment merely represents an instance (i.e., a feasible solution) of its technical solution, and there is no strict coordination or limitation relationship between the parameters. The parameters can be substituted for each other without violating axioms and the claims of this invention, unless otherwise stated.

[0136] The technical means disclosed in this invention are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above descriptions are specific embodiments of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

[0137] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for preparing a composite material using recycled electroplating-grade waste ABS, characterized in that, The method includes the following steps: S1. The collected waste ABS plastic parts are classified according to color, aging degree and surface coating condition. Parts with severe surface aging and abnormal color are removed. The labels, coatings and foreign objects on the surface of the sorted waste ABS plastic parts are removed by a sanding machine to obtain waste ABS plastic parts that have been preliminarily cleaned. S2. Then, the waste ABS plastic parts are fed into the crusher for crushing and are screened through the screen in the crushing chamber and the screen in the discharge chamber of the crusher to obtain waste ABS plastic chips with uniform size after secondary impurity filtration. The crusher uses a double-layer screen. The screen aperture of the crushing chamber is 20mm. When the plastic is crushed to a size smaller than the screen aperture, it will pass through the screen aperture in the crushing chamber and fall into the discharge chamber. The screen aperture in the discharge chamber is 10mm. Plastic fragments coming out of the screen in the crushing chamber slide down the screen plate in the discharge chamber to the discharge port. Foreign objects smaller than the screen aperture will be screened out during the sliding process. At the same time, during crushing, washing water is introduced from the top of the crusher into the crushing chamber and the discharge chamber. S3. Waste ABS plastic chips are conveyed to a brine tank via a conveyor auger. The brine density is 1.08 g / cm³. 3 Plastic foreign matter is removed by flotation and then conveyed to a vertical dewatering machine. Under centrifugal action, the brine on the surface of the waste plastic chips is removed, and at the same time, the foreign matter remaining on the surface of the chips is further removed under centrifugal friction, resulting in further purified waste plastic chips. The vertical dewatering machine is a centrifugal separator with a spiral rotating shaft and a screen cylinder, and the dewatering rotation speed is 1500 rpm; the screen cylinder of the vertical dewatering machine has a mesh size of 2 mm; S4. The waste plastic chips are sent to the clean water tank. In the clean water tank, the density of ABS is greater than that of water, so it will sink to the bottom. Other impurities with a density less than that of water will float on the surface. Then, the impurities floating on the surface are removed. The waste plastic chips at the bottom are conveyed to the second vertical dewatering machine through the bottom auger. After two centrifugal dewatering processes, they are blown into the homogenization tank by hot air for homogenization to obtain pure and uniform recycled ABS plastic chips. S5. Prepare the following raw materials in the indicated weight proportions: 94 parts recycled ABS chips, 5 parts high-polymer powder, 0.5 parts lubricant, and 0.5 parts antioxidant Irganox 1076. The high-rubber powder is a core-shell polymer of styrene and acrylonitrile-butadiene rubber, with a rubber content of 55-70%. The lubricant is silicone powder KJ-B120; S6. The recycled ABS chips, high-rubber powder, lubricant, and antioxidant are uniformly mixed and then fed into a two-stage screw extruder for melt extrusion granulation. The main current of the two-stage screw extruder is controlled at 120A, and the temperature of each zone is 190℃. The current of the sub-extruder is controlled at 120A, and the temperature of each zone is 210℃. Both the main and sub-extruders of the two-stage screw extruder are single screws. The screen changer 1 in the main extruder is a hydraulic double-column screen changer filter. The screen changer 2 in the sub-extruder is a chemical fiber screen filter. The screen mesh size of the screen changer 1 is 200 mesh, and the screen mesh size of the screen changer 2 is 350 mesh.

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