Recycling method and application method of PS (polystyrene) industrial and waste plastics

Abstract

The invention provides a recovery method and application method of PS (polystyrene) industrial waste plastics, and the recovery method of the PS industrial waste plastics comprises the following steps: S1, recovering the PS industrial waste plastics to obtain a PS industrial waste recovered material; and S2, mixing the PS industrial waste reclaimed material, the PS new material, the flexibilizer, the lubricant and the toner, and processing by an extruder to form the PS reclaimed material. According to the method, the PS industrial waste plastic is recycled to replace part of the PS new material to prepare the PS reclaimed material, and the material performance of the PS reclaimed material can be kept unchanged, so that the production and processing cost is reduced, the resource waste is reduced, and the material value increase of the PS industrial waste plastic is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PS industrial waste plastic utilization, and particularly relates to a PS industrial waste plastic recycling method and application method. BACKGROUND

[0002] Polystyrene (PS) is a polymer synthesized by free radical polymerization of styrene monomer, and its chemical formula is (C8H8)n. It is a colorless and transparent thermoplastic plastic with a glass transition temperature higher than 100 DEG C, excellent thermal insulation, insulation, transparency and good formability, and is widely used in the housings and internal components of household appliances.

[0003] The existing patent CN110039680B discloses a plastic waste treatment system, which comprises a crusher, a first separation and sedimentation tank, an electrostatic separation system and a second separation and sedimentation tank. The crusher is used to crush the plastic waste. The output end of the crusher is connected with the first separation and sedimentation tank. The crushed plastic waste is transported to the first separation and sedimentation tank. The first separation and sedimentation tank performs water selection on the crushed plastic waste through the liquid stored therein. The first separation and sedimentation tank is provided with a first floating water material output end and a first sinking bottom material output end. The main component of the material output from the first floating water material output end is PE and / or PP. The first sinking bottom material output end is connected with the electrostatic separation system. The electrostatic separation system is provided with an ABS output end and a PS output end. The main component of the material output from the ABS output end is ABS. The main component of the material output from the PS output end is PS. The PS output end is connected with the second separation and sedimentation tank. The technical scheme can classify the plastic waste into PE / PP, ABS, environmentally friendly PS and non-environmentally friendly PS as main components. However, the classified materials of various materials cannot be directly applied due to the difference between their performance and new materials, and are usually used to prepare material components with low performance requirements. SUMMARY

[0004] In order to overcome the problems in the related art, the purpose of the present application is to provide a PS industrial waste plastic recycling method, which recycles PS industrial waste plastic, replaces part of PS new material to prepare PS regenerated material, and can ensure that the material performance of the PS regenerated material remains unchanged, thereby reducing production and processing costs, reducing resource waste, and realizing material value-added of PS industrial waste plastic.

[0005] The PS industrial waste plastic recycling method provided in the present application comprises:

[0006] S1: recycling PS industrial waste plastic to obtain PS industrial waste recycling material;

[0007] S2: mixing the PS industrial waste recycling material, PS new material, toughening agent, lubricant and color powder, and processing through an extruder to form PS regenerated material.

[0008] In the preferable technical scheme of the present application, the PS waste recycling material, the GPPS recycling material, the PS new material, the toughening agent, the lubricant and the color powder are mixed in step S2, and the PS recycling material is formed by processing through an extruder.

[0009] In the preferable technical scheme of the present application, the PS waste recycling material, the GPPS recycling material, the PS new material, the toughening agent, the lubricant and the color powder are mixed in step S2, and the PS recycling material is formed by processing through an extruder.

[0010] In the preferable technical scheme of the present application, the PS waste recycling material, the GPPS recycling material, the PS new material, the toughening agent, the lubricant and the color powder are mixed in step S2, and the PS recycling material is formed by processing through an extruder.

[0011] In the preferable technical scheme of the present application, the preparation method of the GPPS recycling material comprises: crushing a refrigerator drawer to obtain the GPPS recycling material.

[0012] In the preferable technical scheme of the present application, the PS waste plastic is from an air conditioner shell.

[0013] In step S1, the PS waste plastic is recycled to obtain a PS waste recycling material, and the step specifically comprises:

[0014] S11: crushing the PS waste plastic to obtain a PS waste crushed material;

[0015] S12: cleaning the PS waste crushed material with 12wt%-18wt% brine to remove metals, alloys and light and thin impurities, and then removing dirty impurities by friction cleaning;

[0016] S13: performing electrostatic separation on the cleaned PS waste crushed material to obtain a PS crushed material and an ABS crushed material respectively;

[0017] S14: removing black and dark gray impurities from the PS crushed material by a color sorter;

[0018] S15: purifying the PS crushed material by a material sorting machine to obtain the PS waste recycling material.

[0019] In the preferable technical scheme of the present application, the PS waste recycling material is obtained by purifying the PS crushed material by a material sorting machine in step S15, and the step specifically comprises:

[0020] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0021] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0022] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0023] In a preferred embodiment of the present invention, step S2 involves mixing recycled PS waste material, virgin PS material, toughening agent, lubricant, and color powder, and then processing the mixture through an extruder to form recycled PS material. Specifically, this includes:

[0024] S21: PS waste material, PS virgin material, toughening agent, lubricant and color powder are mixed and processed by a twin-screw extruder to form PS-PIR granules; wherein the extrusion temperature of the twin-screw extruder is 200-220℃;

[0025] S22: The PS-PIR granulated material is injection molded in an injection molding machine to form the PS recycled material; wherein the injection temperature of the injection molding machine is 210-230℃.

[0026] In a preferred embodiment of the present invention, the pigment comprises the following components in parts by weight: 0.004-0.006 parts carbon black, 0.01-0.03 parts titanium yellow, 0.003-0.005 parts iron oxide red, and 0.3-0.5 parts titanium white.

[0027] The second objective of this application is to provide a method for using PS industrial waste plastic, wherein the recycled PS material is used to prepare an air conditioner bottom shell; the recycled PS material is prepared by the PS industrial waste plastic recycling method described above.

[0028] The beneficial effects of this invention are as follows:

[0029] This invention provides a method for recycling PS industrial waste plastics, comprising: recycling PS industrial waste plastics to obtain PS industrial waste recycled material; mixing the PS industrial waste recycled material, PS virgin material, toughening agent, lubricant, and color powder, and processing the mixture through an extruder to form PS recycled material. This application recycles PS industrial waste plastics to replace a portion of the PS virgin material in the preparation of PS recycled material, while ensuring that the material properties of the PS recycled material remain unchanged, thereby reducing production and processing costs, minimizing resource waste, and achieving added value from PS industrial waste plastics.

[0030] This application provides a method for applying PS industrial waste plastics, in which the PS recycled material prepared as above is used to manufacture air conditioner bottom shells. This application realizes the application of PS industrial waste plastics in air conditioner bottom shells by recycling PS industrial waste plastics, ensuring that the performance of air conditioner bottom shells formed by PS recycled material is equivalent to that formed by PS virgin material, thus realizing the application of PS industrial waste plastics in air conditioners and achieving the purpose of saving resources and reducing raw material costs. Attached Figure Description

[0031] Figure 1 This describes the processing technology of PS recycled material in the embodiments of this application. Detailed Implementation

[0032] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0033] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0034] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] like Figure 1 As shown, this application provides a method for recycling PS industrial waste plastic, comprising:

[0036] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0037] Specifically, it includes:

[0038] S11: Crushing PS industrial waste plastic to obtain PS industrial waste crushed material;

[0039] S12: The PS industrial waste crushed material is washed with 12wt%-18wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0040] In this step, a 15wt% brine solution is used for material sorting. ABS and PS, both with a density of 1.05, will float on the surface of the brine, while denser materials, such as alloys and flame-retardant materials, will sink to the bottom. The brine tank has both a floating material outlet and a settling material outlet. Therefore, the settling material in the 15wt% brine tank consists of alloys and flame-retardant materials, which are discharged from the settling material outlet; the floating material consists of ABS and PS materials, which flow out from the floating material outlet. After cleaning the surface impurities of the crushed material with a friction agent, it is then rinsed and discharged from the clear water tank. The clear water tank is used to further rinse away adhesive paper impurities from the surface of the crushed material. The clear water tank has both a settling material outlet and a floating material outlet. In the clear water tank, ABS and PS crushed material, being denser than water, will sink to the bottom and be discharged from the settling material outlet. Therefore, the settling material consists of ABS and PS crushed material; the floating material consists of adhesive paper, sponge impurities, and some PP impurities.

[0041] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0042] The sediment discharged from the clear water tank is a mixture of crushed ABS and PS. In this step, the crushed PS and ABS mixture has a particle size of approximately 2-10mm and needs to be separated by electrostatic separation. The principle of electrostatic separation is as follows: When the crushed ABS and PS mixture enters the rotating metal drum of the electrostatic separator through a vibrating feeder, the crushed material collides and rubs against the drum, causing the PS crushed material to gain electrons and become negatively charged, while the ABS crushed material loses electrons and becomes positively charged. Passing through the high-voltage electrode behind the drum, the negatively charged PS crushed material is attracted by the positive electrode and flies towards the positive electrode collection tank; the positively charged ABS crushed material is attracted by the negative electrode and flies towards the negative electrode collection tank. Thus, the PS crushed material and ABS crushed material are separated, and the purity of the PS crushed material after electrostatic separation reaches over 85%.

[0043] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0044] The main function of the color sorter in this step is to distinguish white materials from black and dark gray impurities, and the color sorter can automatically remove black impurities. Impurities generally consist of residual black and dark gray flame retardant materials, and small amounts of black and dark gray ABS or PS plastic sheets.

[0045] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. The material sorting machine includes a first near-infrared sorter and a second near-infrared sorter connected in series. Specifically, it includes:

[0046] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0047] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0048] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0049] In this step, the near-infrared separator has three outlets. The first outlet is for PS material, and the output of this outlet is large, making it the main material. The second outlet is for ABS material, and the output of this outlet is small. The third outlet is for discarded impurities, which are generally non-plastic impurities such as metal / rubber.

[0050] This application requires reverse selection of the material at the second outlet of two near-infrared separators connected in series. This is because the ABS material output from the second outlet contains a small amount of PS. Therefore, after reverse selection, another material sorting process is carried out to separate the PS finished product from the ABS, thereby reducing PS loss.

[0051] In this step, two near-infrared separators are connected in series. The ABS material output from the second outlet of the first and second near-infrared separators can be stored in the same feeder and then passed through the two near-infrared separators connected in series to achieve maximum screening of PS material. The final PS material has a purity of over 99.5% and can reduce product loss.

[0052] S2: PS industrial waste material, PS virgin material, toughening agent, lubricant and color powder are mixed and processed by an extruder to form PS recycled material.

[0053] As a specific embodiment, 70-80 parts of recycled PS industrial waste, 20-30 parts of virgin PS, 0-3 parts of toughening agent, 0.2-0.5 parts of lubricant, and 0.3-0.5 parts of color powder are mixed and processed by an extruder to form recycled PS material. Replacing part of the virgin PS material with recycled PS industrial waste can meet the impact strength and tensile strength requirements of the recycled PS material.

[0054] In another specific embodiment, 70-80 parts of recycled PS industrial waste, 10-15 parts of recycled GPPS, 10-20 parts of virgin PS, 0-3 parts of toughening agent, 0.2-0.5 parts of lubricant, and 0.3-0.5 parts of color powder are mixed and processed by an extruder to form recycled PS material. The preparation method of the recycled GPPS material includes crushing and purifying a refrigerator drawer to obtain the recycled GPPS material. Replacing part of the virgin PS material with recycled PS industrial waste and recycled GPPS material can meet the impact strength and tensile strength requirements of the recycled PS material, further reduce costs, achieve the conversion of low-value (refrigerator waste material) to high-value (air conditioner virgin material), and improve the performance of the compounded product.

[0055] The pigment comprises the following components in parts by weight: 0.004-0.006 parts carbon black, 0.01-0.03 parts titanium yellow, 0.003-0.005 parts iron oxide red, and 0.3-0.5 parts titanium white.

[0056] The lubricant used is EBS, a type of white oil.

[0057] The toughening agent is SEBS, a type of SBS.

[0058] GPPS recycled material is a crushed product from existing technologies. Specifically, GPPS recycled material is a high-tensile material derived from refrigerator drawers; it is obtained by crushing used refrigerator drawers, removing impurities, and purifying them. The impact strength of GPPS recycled material is 3-5 KJ / m². 2 The tensile strength is between 30-35 MPa.

[0059] This step specifically includes:

[0060] S21: PS waste material, PS virgin material, toughening agent, lubricant and color powder are mixed and processed by a twin-screw extruder to form PS-PIR granules; wherein the extrusion temperature of the twin-screw extruder is 200-220℃;

[0061] S22: The PS-PIR granulated material is injection molded in an injection molding machine to form the PS recycled material (PS-PIR); wherein the injection temperature of the injection molding machine is 210-230℃.

[0062] In summary, this application combines GPPS recycled material with PS industrial waste material to replace virgin PS material, thereby achieving the conversion of low-value (refrigerator waste material) to high-value (air conditioner virgin material) materials and improving the performance of the compounded product.

[0063] This application employs an electrostatic + material sorting system, achieving a plastic purity of 99.5%. The raw materials and processes used in this application produce industrial waste plastics that can be reused, thus realizing a closed-loop resource system.

[0064] This application also provides a method for using PS industrial waste plastic, in which the recycled PS material is used to prepare an air conditioner base shell; the recycled PS material is prepared using a PS industrial waste plastic recycling method as described above. Specifically, in step S2, the PS-PIR granulated material is injection molded in an injection molding machine to form the air conditioner base shell.

[0065] The following specific examples provide further details. In these examples, the PS raw material is Kumho Sunrise HIPS-888G.

[0066] Example 1

[0067] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0068] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0069] Specifically, it includes:

[0070] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0071] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0072] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0073] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0074] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0075] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0076] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0077] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0078] S2: Mix 75 parts of recycled PS waste material, 25 parts of virgin PS material, 1.5 parts of toughening agent, 0.3 parts of lubricant, and 0.4 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0079] Specifically, it includes:

[0080] S21: Mix 75 parts of recycled PS waste material, 24 parts of virgin PS material, 1.5 parts of toughening agent, 0.3 parts of lubricant and 0.4 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein the extrusion temperature of the twin-screw extruder is 200-220℃.

[0081] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0082] Example 2

[0083] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0084] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0085] Specifically, it includes:

[0086] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0087] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0088] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0089] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0090] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0091] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0092] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0093] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0094] S2: Mix 70 parts of recycled PS waste material, 30 parts of virgin PS material, 0.2 parts of lubricant, and 0.5 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0095] Specifically, it includes:

[0096] S21: Mix 70 parts of recycled PS waste material, 30 parts of virgin PS material, 0.2 parts of lubricant and 0.5 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein, the extrusion temperature of the twin-screw extruder is 200-220℃;

[0097] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0098] Example 3

[0099] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0100] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0101] Specifically, it includes:

[0102] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0103] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0104] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0105] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0106] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0107] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0108] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0109] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0110] S2: Mix 80 parts of recycled PS waste material, 20 parts of virgin PS material, 3 parts of toughening agent, 0.5 parts of lubricant, and 0.3 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0111] Specifically, it includes:

[0112] S21: Mix 80 parts of recycled PS waste material, 20 parts of virgin PS material, 3 parts of toughening agent, 0.5 parts of lubricant and 0.3 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein the extrusion temperature of the twin-screw extruder is 200-220℃;

[0113] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0114] Example 4

[0115] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0116] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0117] Specifically, it includes:

[0118] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0119] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0120] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0121] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0122] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0123] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0124] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0125] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0126] S2: Mix 75 parts of recycled PS industrial waste, 13 parts of recycled GPPS, 15 parts of virgin PS, 1.5 parts of toughening agent, 0.3 parts of lubricant, and 0.4 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0127] Specifically, it includes:

[0128] S21: Mix 75 parts of recycled PS industrial waste material, 13 parts of recycled GPPS material, 15 parts of virgin PS material, 1.5 parts of toughening agent, 0.3 parts of lubricant and 0.4 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein, the extrusion temperature of the twin-screw extruder is 200-220℃.

[0129] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0130] Example 5

[0131] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0132] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0133] Specifically, it includes:

[0134] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0135] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0136] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0137] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0138] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0139] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0140] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0141] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0142] S2: Mix 70 parts of recycled PS industrial waste, 15 parts of recycled GPPS, 10 parts of virgin PS, 0.2 parts of lubricant, and 0.5 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0143] Specifically, it includes:

[0144] S21: Mix 70 parts of recycled PS industrial waste material, 15 parts of recycled GPPS material, 10 parts of virgin PS material, 0.2 parts of lubricant and 0.5 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein, the extrusion temperature of the twin-screw extruder is 200-220℃;

[0145] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0146] Example 6

[0147] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0148] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0149] Specifically, it includes:

[0150] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0151] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0152] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0153] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0154] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0155] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0156] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0157] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0158] S2: Mix 80 parts of recycled PS industrial waste, 10 parts of recycled GPPS, 20 parts of virgin PS, 3 parts of toughening agent, 0.5 parts of lubricant, and 0.3 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0159] Specifically, it includes:

[0160] S21: Mix 80 parts of recycled PS industrial waste, 10 parts of recycled GPPS, 20 parts of virgin PS, 3 parts of toughening agent, 0.5 parts of lubricant, and 0.3 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein, the extrusion temperature of the twin-screw extruder is 200-220℃;

[0161] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0162] Comparative Example 1

[0163] This embodiment provides a method for recycling PS industrial waste plastic, including:

[0164] S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; among which, PS industrial waste plastic comes from air conditioner casing;

[0165] Specifically, it includes:

[0166] S11: Crush the air conditioner casing to obtain PS industrial waste crushed material;

[0167] S12: The PS industrial waste crushed material is washed with 15wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities.

[0168] S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively;

[0169] S14: Remove black and dark gray impurities from the crushed PS material using a color sorter;

[0170] S15: The PS crushed material is purified using a material sorting machine to obtain the PS industrial waste recycled material. Specifically, this includes:

[0171] S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively;

[0172] S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively;

[0173] S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

[0174] S2: Mix 75 parts of recycled PS industrial waste, 13 parts of recycled GPPS, 15 parts of virgin PS, 1.5 parts of toughening agent, 0.3 parts of lubricant, and 0.4 parts of color powder, and process by extrusion to form recycled PS material. The color powder comprises the following components by weight: 0.005 parts carbon black, 0.02 parts titanium yellow, 0.004 parts iron oxide red, and 0.4 parts titanium dioxide; the lubricant is EBS; and the toughening agent is SEBS.

[0175] Specifically, it includes:

[0176] S21: Mix 99 parts of recycled PS industrial waste material, 1.5 parts of toughening agent, 0.3 parts of lubricant and 0.4 parts of color powder, and process them through a twin-screw extruder to form PS-PIR granules; wherein the extrusion temperature of the twin-screw extruder is 200-220℃;

[0177] S22: The PS-PIR granulated material is injection molded in an injection molding machine at 210-230℃ to form an air conditioner base plate or test strip. For example, it can be injection molded to form tensile strips, bending strips, and impact strips.

[0178] Tests showed that the impact strength of GPPS recycled material was 3-5 (KJ / m²). 2 The tensile strength is between 30-35 MPa.

[0179] The impact strength of PS industrial waste recycled material is 8-9 (KJ / m). 2 The tensile strength is between 20-25 MPa.

[0180] The impact strength of new PS material is 10-11 (KJ / m).2 The tensile strength is between 28-32 MPa.

[0181] The dimensions of the tensile, bending, and impact specimens are shown in Tables 1, 2, and 3. Performance tests were conducted on the specimens according to national standards. Before testing, the specimens were placed in an environment of (23±2)℃ and (50±10)% humidity for 88 hours. The test results are shown in Table 4.

[0182] Table 1 Dimensions of Tensile Splines

[0183] Length (mm) Width (mm) Thickness (mm) 150±2 10±0.2 4±0.2

[0184] Table 2 Dimensions of Bending Spline

[0185] Length (mm) Width (mm) Thickness (mm) 80±2 10±0.2 4±0.2

[0186] Table 3 Impact spline dimensions

[0187] Length (mm) Width (mm) Thickness (mm) Notched remaining width (mm) 80±2 10±0.2 4±0.2 8±0.2

[0188] Table 4. Test data for examples and comparative examples

[0189]

[0190] It can be seen that using only recycled PS industrial waste material without adding virgin PS results in low impact strength of the test specimens, which cannot meet the application requirements of air conditioner base shells. Therefore, this application mixes recycled PS industrial waste material with virgin PS material, ensuring that the impact strength, tensile strength, elongation at break, and color difference of the specimens meet the requirements. Compared to virgin PS material, this reduces the cost of the air conditioner base shell.

[0191] Based on this, by replacing part of the virgin PS material with recycled PS industrial waste material, and then replacing part of the virgin PS material with recycled GPPS material, it is possible to ensure that the impact strength, tensile strength, elongation at break, and color difference of the sample meet the requirements, while also further reducing production costs.

[0192] GPPS recycled material is a high-tensile material derived from refrigerator drawers. Specifically, used refrigerator drawers are crushed, and impurities are removed and purified to obtain GPPS recycled material. This application combines GPPS recycled material with PS industrial waste material to replace virgin PS, achieving a conversion from low-value (refrigerator waste material) to high-value (air conditioner virgin material) materials and improving the performance of the compounded product.

[0193] This application employs an electrostatic + material sorting system, achieving a plastic purity of 99.5%. The raw materials and processes used in this application produce industrial waste plastics that can be reused, thus realizing a closed-loop resource system.

[0194] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0195] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0196] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for recycling PS industrial waste plastic, characterized in that, include: S1: Recycle PS industrial waste plastic to obtain PS industrial waste recycled material; S2: PS industrial waste material, PS virgin material, toughening agent, lubricant and color powder are mixed and processed by an extruder to form PS recycled material.

2. The method for recycling PS industrial waste plastic according to claim 1, characterized in that, In step S2, 70-80 parts of recycled PS waste material, 20-30 parts of virgin PS material, 0-3 parts of toughening agent, 0.2-0.5 parts of lubricant and 0.3-0.5 parts of color powder are mixed and processed by an extruder to form recycled PS material.

3. The method for recycling PS industrial waste plastic according to claim 1, characterized in that, In step S2, PS industrial waste recycled material, GPPS recycled material, PS virgin material, toughening agent, lubricant and color powder are mixed and processed by an extruder to form PS recycled material.

4. The method for recycling PS industrial waste plastic according to claim 3, characterized in that, In step S2, 70-80 parts of recycled PS industrial waste material, 10-15 parts of recycled GPPS material, 10-20 parts of virgin PS material, 0-3 parts of toughening agent, 0.2-0.5 parts of lubricant and 0.3-0.5 parts of color powder are mixed and processed by an extruder to form recycled PS material.

5. A method for recycling PS industrial waste plastic according to claim 3, characterized in that, The method for preparing the GPPS recycled material includes: crushing a refrigerator drawer to obtain the GPPS recycled material.

6. The method for recycling PS industrial waste plastic according to claim 1, characterized in that, The PS industrial waste plastic comes from the air conditioner casing; In step S1, PS industrial waste plastic is recycled to obtain PS industrial waste recycled material, specifically including: S11: Crushing PS industrial waste plastic to obtain PS industrial waste crushed material; S12: The PS industrial waste crushed material is washed with 12wt%-18wt% brine to remove metals, alloys and light impurities; then it is washed with friction to remove dirt and impurities. S13: The cleaned PS industrial waste shredded material is electrostatically separated to obtain PS shredded material and ABS shredded material respectively; S14: Remove black and dark gray impurities from the crushed PS material using a color sorter; S15: The PS crushed material is purified by a material sorting machine to obtain the PS industrial waste recycled material.

7. A method for recycling PS industrial waste plastic according to claim 6, characterized in that, In step S15, the PS crushed material is purified by a material sorting machine to obtain the PS industrial waste recycled material, specifically including: S151: The PS crushed material is put into the inlet of the first near-infrared separator, and the two outlets of the first near-infrared separator output the first PS material and the first ABS material respectively; S152: The first PS material is placed into the inlet of the second near-infrared separator, and the two outlets of the second near-infrared separator output the second PS material and the second ABS material respectively; S153: The first ABS material and the second ABS material are sequentially passed through the first near-infrared separator and the second near-infrared separator to obtain the third PS material and the third ABS material; the third PS material and the second PS material are mixed to obtain the PS industrial waste recycled material.

8. A method for recycling PS industrial waste plastic according to claim 1, characterized in that, In step S2, recycled PS waste material, virgin PS material, toughening agent, lubricant, and color powder are mixed and processed through an extruder to form recycled PS material, specifically including: S21: PS waste material, PS virgin material, toughening agent, lubricant and color powder are mixed and processed by a twin-screw extruder to form PS-PIR granules; wherein the extrusion temperature of the twin-screw extruder is 200-220℃; S22: The PS-PIR granulated material is injection molded in an injection molding machine to form the PS recycled material; wherein the injection temperature of the injection molding machine is 210-230℃.

9. A method for recycling PS industrial waste plastic according to claim 1, characterized in that, The pigment comprises the following components in parts by weight: 0.004-0.006 parts carbon black, 0.01-0.03 parts titanium yellow, 0.003-0.005 parts iron oxide red, and 0.3-0.5 parts titanium white.

10. A method for applying PS industrial waste plastic, characterized in that, The recycled PS material is used to prepare the air conditioner bottom shell; the recycled PS material is prepared by the recycling method of PS industrial waste plastic as described in any one of claims 1-9.

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