Method for manufacturing recycled resin and recycled resin

Abstract

Providing a method for producing recycled resin from recovered resin products. [Solution] A method for manufacturing recycled resin using recovered resin products as raw material, wherein the raw material is (A) PC resin, (B) PC resin / ABS resin, or (C) a mixture of PC resin and PC resin / ABS resin, and the manufacturing process includes the following steps (a) to (d): (a) A process of recovering the materials as components of products used in the market. (b) A step to remove seals and particles attached to the parts recovered in step (a) above, (c) A process of crushing the parts obtained in the above process (b) and recovering the crushed material. (d) A process to obtain recycled resin by mixing and kneading the crushed material obtained in step (c) above with a Charpy strength modifier for PC resin (polycarbonate resin). The recycled resin has flame retardant properties equivalent to 5V, a flexural modulus of 2500 MPa or higher, and a Charpy impact strength of 5.0 kJ / m². 2 A method for producing recycled resin, which is as described above.

Description

[Technical Field]

[0001] This invention relates to a method for producing recycled resin and to recycled resin. [Background technology]

[0002] Recycled resin (recycled plastic) is a plastic material made by extracting and recycling plastic from products that have been used in the market and then collected from the market. This plastic recycling process recycles the material, contributing to environmental protection.

[0003] A method for producing recycled resin is already known, which involves using plastics recovered from the market and adding various additives to the recovered plastics to restore their quality (recovery). For example, Patent Document 1 describes the following method for manufacturing recycled resin molded products. A crushing process for crushing recovered resin products made of resin material, A stirring step is performed in which the resin material crushed in the crushing step is mixed with a drip inhibitor that prevents the resin material from dripping during combustion. The mixing step involves adding the mixture of the drip inhibitor and resin material, which was mixed in the stirring step, to the resin molding machine. A method for manufacturing a recycled resin molded product, comprising a molding step of molding a mixture of the drip-preventing agent and a resin material.

[0004] However, previous methods for manufacturing recycled resins required the addition of many additives to restore (recover) their quality. Adding many additives increases the amount of additives in the recycled resin, which tends to lower the proportion of recovered material within the recycled resin. This proportion of recovered material in the recycled resin is expressed as the cut-in rate or recovered material load rate. Until now, recycled resins required the addition of many additives to restore quality, resulting in the problem that the cut-in rate (recovered material load rate) could not exceed 90%. [Overview of the project] [Problems that the invention aims to solve]

[0005] This invention relates to a method for producing recycled resin, which has flame retardancy of 5V in the UL flammability test, and also exhibits strength properties such as a flexural modulus of 2500 MPa or higher and a Charpy impact strength of 5.0 kJ / m². 2 The objective is to manufacture recycled resin with a quality of 90% or higher, with a cutting rate (recovered material loading rate) of 90% or higher. [Means for solving the problem]

[0006] The present invention relates to a method for producing recycled resin as described below. A method for manufacturing recycled resin, which uses recovered materials from resin products made of thermoplastic resin as raw materials to regenerate resin, The thermoplastic resin is (A), (B), or (C) below, and has flame retardant properties equivalent to 5V, (A) PC resin (polycarbonate resin) (B) PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) (C) PC resin (polycarbonate resin) and a mixture of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) The manufacturing process includes steps (a) to (d) below. (a) A process of recovering the materials as components of products used in the market. (b) A step to remove seals and particles attached to the parts recovered in step (a) above, (c) A process of crushing the parts obtained in the above process (b) and recovering the crushed material. (d) A process to obtain recycled resin by mixing and kneading the crushed material obtained in step (c) above with a Charpy strength modifier for PC resin (polycarbonate resin). The content of the Charpy strength modifier in the recycled resin is less than 10% by mass. The recycled resin has flame retardant properties equivalent to 5V. The recycled resin has a flexural modulus of 2500 MPa or higher and a Charpy impact strength of 5.0 kJ / m². 2 ) That's all, A method for producing recycled resin characterized by the following: [Effects of the Invention]

[0007] According to the present invention, even recycled resin exhibits flame retardancy of 5V in UL flammability tests, and its strength properties include a flexural modulus of 2500 MPa or higher and a Charpy impact strength of 5.0 kJ / m². 2 ) Recycled resins possessing the above characteristics can be manufactured with a high cutting rate (recovered material loading rate). [Modes for carrying out the invention]

[0008] Typical commercially available recycled resins (recycled materials, recycled plastics) consist of recycled recovered resins (recovered materials, recovered plastics) and additives that improve the quality of the recycled resins. Recycled resins are required to meet certain quality standards, and by selecting and adding a large amount of additives, the required quality can be achieved. However, adding many additives to ensure the quality of the recycled resin reduces the cutting rate (the rate at which the recovered material is loaded).

[0009] In typical commercially available recycled resins (recycled materials, recycled plastics), additives make up more than 20%, and as a result, the cut-in rate (recycled material loading rate) was capped at 80%. By increasing the cutting rate (recovery material loading rate) to over 90%, the amount of additives can be reduced. Furthermore, since additives are new materials, the less they are added, the more environmentally friendly they become.

[0010] In this invention, the following studies were conducted to ensure the quality of the recycled resin and to increase the cutting rate (recovery material loading rate). (Study on recycled resin (recycled material, recycled plastic) (1)) ·The plastic of our own products (printers) used in the market was recycled. ·The plastic of our own products (printers) originally contains various additives to improve flame retardancy and strength. ·By using recycled resin (recycled material, recycled plastic) containing various additives, the amount of newly added additives can be reduced. ·The plastic of our own products (printers) originally contains additives, and since we know what additives are contained, we can make full use of the originally contained additives. ·Regarding newly added additives, additives of the same type as the originally contained additives can be added. ·As a result, the amount of newly added additives can be reduced.

[0011] (Study on recycled resin (recycled material, recycled plastic) (2)) ·By blending (mixing) recycled resin (recycled material, recycled plastic) with two types of materials, the required properties can be approximated. ·The required properties include flame retardancy and strength physical properties. ·The materials include PC and PC / ABS. Generally, in terms of flame retardancy and Charpy strength physical properties, PC is higher than PC / ABS. ·Utilizing this property, by adding PC, which is a recycled resin, to PC / ABS, which is also a recycled resin, the required properties can be achieved without adding a large amount of additives.

[0012] In the material circulation of PCMR (Plastic Closed - Loop Material Recycling), for the quality recovery of using thermoplastic resin, which is a part of products used in the market and has a flame - retardant property equivalent to 5V, as a recycled material, the content of additives in the recycled resin can be less than 10% by mass. As a result, the cut - in rate (recycled material loading rate) can be increased.

[0013] The recycled resin (recycled material, recycled plastic) will be described below.

[0014] <Thermoplastic resin> The following thermoplastic resins can be used: (PC resin) The polycarbonate resin (PC resin) may be an aromatic homopolycarbonate resin or a copolymer resin obtained, for example, by reacting an aromatic divalent phenolic compound with phosgene or a diester carbonate. Examples of aromatic divalent phenolic compounds include 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxy-3,5-diphenyl)butane, 2,2-bis(4-hydroxy-3,5-diethylphenyl)propane, 2,2-bis(4-hydroxy-3,5-diethylphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, and 1-phenyl-1,1-bis(4-hydroxyphenyl)ethane, which may be used individually or in mixtures.

[0015] (PC / ABS resin) PC / ABS resin is a mixed resin of PC resin (polycarbonate resin) and ABS resin (acrylonitrile-butadiene-styrene copolymer resin). Alternatively, a block copolymer of PC resin and ABS resin may be used instead of PC / ABS resin.

[0016] (Recycled material) The above resin may be made from recycled plastic material (recycled plastic material). Recycled materials include, for example, plastics recovered from products such as printers, but may also include market-recovered materials, such as recycled plastic materials (recovered plastic materials) from home appliances such as air conditioners, televisions, refrigerators, and washing machines, as well as used office equipment.

[0017] (Method of manufacturing recycled resin) The method for producing the recycled resin of the present invention includes the following steps. (a) A process of recovering the materials as components of products used in the market. (b) A step to remove seals and particles attached to the parts recovered in step (a) above, (c) A process of crushing the parts obtained in the above process (b) and recovering the crushed material. (d) A process to obtain recycled resin by mixing and kneading the crushed material obtained in step (c) above with a Charpy strength modifier for PC resin (polycarbonate resin). The following describes each step in the manufacturing method of the recycled resin described above.

[0018] <Process (a)> Step (a) is the process of recovering components of resin products made of thermoplastic resin that have been used in the market.

[0019] The recovered plastic (recycled material) is composed of thermoplastic resin. The thermoplastic resin is either PC resin (polycarbonate resin), PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin), or a mixture of PC resin (polycarbonate resin) and PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin).

[0020] Furthermore, the thermoplastic resin that makes up the above-mentioned recovered material has flame retardant properties equivalent to UL standard 5V. Thermoplastic resins containing recycled materials (recycled plastics) are obtained by recovering printer parts from products used in the market. These recovered printer parts, having accumulated dust, debris, particles, and stickers from market use, need to be removed. In the following explanation, we will use a printer, which is one of our company's products, as an example of recycled material.

[0021] For example, the collected materials include printers that have been used in the market for approximately 5 to 10 years after being sold by the company. While various plastic parts from printers are subject to recycling, the most frequently collected are the outer casing panels (exterior parts, exterior plates), which form the outer frame of the printer body. Other examples of parts collected include components around the exhaust duct used inside the printer, cases for storing paper, and covers that protect various functions such as developing. The outer casings of typical printers found in offices and convenience stores are large in size and therefore heavy, making them more efficient to recycle than smaller parts. Regarding collection, printers collected from users are gathered at recycling centers located throughout the country, where workers manually remove the printer's outer casing for collection. The collected casing is then shredded in the next process, so cracks or damage are not a problem.

[0022] <Process (b)> Step (b) is a step to remove seals and particles attached to the parts recovered in step (a) above. The collected parts are those that have been used by users for 5 to 10 years, so dust, debris, and other particles have accumulated in the uneven surfaces of the parts. Dust can be removed by blowing compressed air onto it. Also, if toner residue is stuck to the parts, this residue can be removed by washing it with water.

[0023] Stickers attached to printers must be removed because they become impurities during the plastic recycling process, degrading the quality of the recycled resin. If these types of seals are not removed before material recycling, the strength of the plastic may decrease. Methods for removing seals include dry methods, which involve polishing with a belt-type file, and wet methods, which involve using water pressure from a high-pressure water jet.

[0024] When printers are shipped, labels containing information about the device, such as the manufacturing lot number, and contact information for troubleshooting are sometimes affixed to the product. Compatible labels are used for these types of labels. For example, when using PC / ABS as the material, if a seal made of ABS resin is used, it is not necessary to remove this compatible seal when manufacturing recycled resin from the recovered material. This is because the plastic material is heated and melted during the mixing process, and at this time, the seal made of ABS resin also melts together and mixes with the PC / ABS resin that makes up the part to become the same material, so the quality of the recycled resin after recycling is not reduced.

[0025] <Process (c)> Step (c) is a step in which the parts obtained in step (b) above are crushed and the crushed material is recovered. For crushing, a crusher with a power output of 10 to 100 horsepower is used. The crushed size can be adjusted using a perforated metal filter attached to the crusher, allowing the material to be crushed to a size suitable for the subsequent mixing process. The size of the metal hole is preferably around Φ10mm to 20mm, and it is possible to produce fragments of a size that can pass through the metal hole. The crushing method is not particularly limited, but for example, a granulator (SPCII-750) manufactured by Harmo Co., Ltd. can be used. When the outer casing is fed into this granulator, the metal blades inside the granulator rotate, crushing the casing. The crushed size is approximately 5mm x 5mm, which is sufficient for the subsequent mixing process. If the outer casing is larger, such as 600 x 800mm, it can be outsourced to a plastic crushing manufacturer. One example of a plastic crushing manufacturer is Wado Shoji Co., Ltd.

[0026] <Process (d)> Step (d) is a process in which the crushed material obtained in step (c) above is mixed with a Charpy strength modifier for PC resin (polycarbonate resin) and kneaded to obtain recycled resin. In step (d), in addition to the Charpy strength modifier, flame retardants to improve flame retardancy and inorganic fillers to improve flexural and tensile strength may be added as additives.

[0027] For the Charpy strength modifier, use a Charpy strength modifier intended for PC (polycarbonate). For PCs, an impact strength modifier (product name Metabren [product code C-223A, rubber component]) manufactured by Mitsubishi Chemical Corporation can be used as a Charpy strength modifier. This Charpy impact strength modifier is for PC resin and, in the sea-island structure of PC / ABS, it can dissolve into the PC or coordinate to the PC, and when PC resin is used as the recovered material, it can improve the Charpy impact strength of the recycled resin.

[0028] A melt-kneading method can be suitably employed as a method for uniformly mixing each component constituting the resin composition. In this mixing process, each of the above components is mixed using a mixing machine known in the art, such as a tumbler, Henschel mixer, Banbury mixer, roll, Brabender, single-screw compounding extruder, twin-screw compounding extruder, or kneader, while appropriately adjusting conditions such as mixing speed, mixing temperature, and mixing time.

[0029] For example, the above components may be pre-mixed using a tumbler, Henschel mixer, etc., and then melt-kneaded in a kneader such as a Banbury mixer, roll, brabender, single-screw extruder, twin-screw extruder, or kneader. Alternatively, for example, the components may be fed into the extruder using a feeder without pre-mixing and then melt-kneaded. The mixing temperature is determined based on the melting temperature (Tm) of the thermoplastic resin. For measuring Tm, any measurement method such as DSC, TMA, DTA, or a viscoelastic device with adjustable temperature may be used, similar to the glass transition temperature (Tg). However, the resin composition of the present invention can be easily obtained by kneading the mixture around the Tm temperature measured using one of these devices.

[0030] As an example of mixing conditions, raw materials are blended in a predetermined composition ratio (parts by mass) using a twin-screw molten metallurg extruder. The mixture is obtained by mixing at a cylinder temperature of 230°C to 240°C using a twin-screw molten metallurg extruder (manufactured by Technobel) with a screw diameter of 25 mm and an effective screw length L / D = 26.

[0031] Next, we will describe the evaluation method for recycled resin obtained by the above-described method for producing recycled resin. (Flame retardancy test) Flame retardancy testing was conducted in accordance with the UL94 test (flammability test for plastic materials for equipment components) set by Underwriters Laboratories (UL) in the United States. The thickness t of the test specimen was 1.5 mm. First, UL94V testing was performed, and the results were determined as "V-0," "V-1," or "V-2." Next, the materials that met the "V-0" or "V-1" rank in the UL94V test were subjected to the UL94-5V test, and a "5V-A" or "5V-B" rating was determined. The recycled resin of the present invention was found to have flame retardant properties equivalent to 5V, which was a favorable result.

[0032] (Charpy impact strength) In accordance with ISO 179-1, impact tests were conducted using a Charpy impact testing machine. The test specimens were notched (cut). A higher measured value (kJ / m2) indicated superior impact resistance. The Charpy impact strength is 5.0 (kJ / m). 2 The above results were considered favorable.

[0033] (Tensile strength) Tensile tests were conducted at 23°C in accordance with ISO 527-2. A higher measured value (MPa) was considered to indicate superior stiffness (tensile strength). The resin composition was molded to a size of 80 x 10 x 4 mm to prepare the measurement sample.

[0034] (Measurement of bending strength and bending modulus) Measurements were performed in accordance with ISO 178. The resin composition was molded to a size of 80 x 10 x 4 mm to prepare the measurement sample. A flexural modulus of 2500 MPa or higher was considered a good result. [Examples]

[0035] The present invention will be described in more detail below based on examples, but the technical scope of the present invention is not limited in any way to the following examples.

[0036] (Preparation of crushed material) Used Ricoh copiers and printers with a market presence of 5 to 10 years were collected from the market. These were disassembled, and the exterior panels made of PC resin and PC resin / ABS resin were recovered. Next, dust and debris adhering to the exterior panels were removed by blowing air and washing with water, after which the labels, screws, nuts, and rubber parts were separated and removed. Next, the outer panels were fed into a granulator (SPCII-750) manufactured by Harmo Co., Ltd. and crushed. The size of the holes in the perforated metal filter was set to 10 mm, and materials with particle size and fragment size of 10 mm or less were selected. The size after crushing is an appropriate size for mixing in the mixing process. Therefore, the size after crushing can be determined in accordance with the specifications of the mixing machine. In the following embodiments, the pulverized material obtained as described above was used as a raw material for thermoplastic resins (PC resin and PC / ASB resin).

[0037] (Example 1) As a raw material for the thermoplastic resin, 100% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) was prepared. The above resin was heated to 250°C using a kneader to obtain pelletized recycled resin. This recycled resin was then molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin has flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all.

[0038] (Example 2) As thermoplastic resins, we prepared 20% by mass of PC resin (polycarbonate resin) and 80% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin). The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 )

[0039] (Example 3) As thermoplastic resins, we prepared 40% by mass of PC resin (polycarbonate resin) and 60% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin). The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all.

[0040] (Example 4) As thermoplastic resins, we prepared 60% by mass of PC resin (polycarbonate resin) and 40% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin). The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all.

[0041] (Example 5) As thermoplastic resins, we prepared 80% by mass of PC resin (polycarbonate resin) and 20% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin). The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin obtained by mixing the above two types of resins has a flame retardant property of 5V, a flexural modulus of elasticity of 2500 Mpa or more, and a Charpy impact strength of 5.0 (kJ / m 2 2) or more.

[0042] (Example 6) As the thermoplastic resin, 100% by mass of PC resin (polycarbonate resin) was prepared. The above resin was heated at 250°C using a kneader to obtain a pelletized recycled resin, and the recycled resin was molded to produce various test samples for evaluating the Charpy impact strength, flexural strength, flexural modulus of elasticity, tensile strength, and flame retardancy. The test results after various tests are shown in Table 1. The recycled resin has a flame retardant property of 5V, a flexural modulus of elasticity of 2500 Mpa or more, and a Charpy impact strength of 5.0 (kJ / m 2 2) or more.

[0043] In the above Examples 1 to 6, examples of recycled materials composed of PC resin and / or PC / ABS resin were shown, but additives such as a Charpy impact strength modifier can be added to improve the Charpy impact strength according to requirements. In Examples 7 to 10 shown below, examples in which 2% by mass of a Charpy impact strength modifier was added are shown.

[0044] (Example 7) As the thermoplastic resin, 19% by mass of PC resin (polycarbonate resin), 79% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin), and 2% by mass of a Charpy impact strength modifier were prepared. The above resins were mixed using a kneader under heating at 250°C. After kneading, a pelletized recycled resin was obtained, and the recycled resin was molded to produce various test samples for evaluating the Charpy impact strength, flexural strength, flexural modulus of elasticity, tensile strength, and flame retardancy. The test results after various tests are shown in Table 1. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all. In particular, an improvement in Charpy impact strength was confirmed.

[0045] (Example 8) As thermoplastic resins, we prepared 39% by mass of PC resin (polycarbonate resin), 59% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin), and 2% by mass of Charpy impact strength modifier. The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all. In particular, an improvement in Charpy impact strength was confirmed.

[0046] (Example 9) As thermoplastic resins, we prepared 59% by mass of PC resin (polycarbonate resin), 39% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin), and 2% by mass of Charpy impact strength modifier. The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all. In particular, an improvement in Charpy impact strength was confirmed.

[0047] (Example 10) As thermoplastic resins, we prepared 79% by mass of PC resin (polycarbonate resin), 19% by mass of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin), and 2% by mass of Charpy impact strength modifier. The above resins were mixed using a kneader under heating conditions of 250°C. After mixing, pelletized recycled resin was obtained, and this recycled resin was molded to produce various test samples for evaluating Charpy impact strength, flexural strength, flexural modulus, tensile strength, and flame retardancy. Table 1 shows the test results after various tests. The recycled resin, a mixture of the two resins mentioned above, possesses flame retardancy of 5V, a flexural modulus of over 2500 MPa, and a Charpy impact strength of 5.0 kJ / m². 2 ) That was all. In particular, an improvement in Charpy impact strength was confirmed.

[0048] Table 1 shows the composition and physical properties of the recycled resins obtained in Examples 1 to 10.

[0049] [Table 1]

[0050] Examples of the present invention are as follows. (1) A method for producing recycled resin using recovered materials from resin products made of thermoplastic resin as raw materials, The thermoplastic resin is (A), (B), or (C) below, and has flame retardant properties equivalent to 5V, (A) PC resin (polycarbonate resin) (B) PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) (C) PC resin (polycarbonate resin) and a mixture of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) The manufacturing process includes steps (a) to (d) below. (a) A process of recovering the materials as components of products used in the market. (b) A step to remove seals and particles attached to the parts recovered in step (a) above. (c) A process of crushing the parts obtained in the above process (b) and recovering the crushed material. (d) A process to obtain recycled resin by mixing and kneading the crushed material obtained in step (c) above with a Charpy strength modifier for PC resin (polycarbonate resin). The content of the Charpy strength modifier in the recycled resin is less than 10% by mass. The recycled resin has flame retardant properties equivalent to 5V. The recycled resin has a flexural modulus of 2500 MPa or higher and a Charpy impact strength of 5.0 kJ / m². 2 ) That's all, A method for producing recycled resin characterized by the following: (Effects) In UL flammability tests, it exhibits flame retardancy of 5V, and in terms of strength properties, its flexural modulus is 2500 MPa or higher, and its Charpy impact strength is 5.0 (kJ / m). 2 Recycled resin having the above characteristics can be manufactured with a high cutting rate (recovered material loading rate). (2) The method for producing recycled resin according to (1) above, wherein the recovered material of the resin product is made using recycled resin. (Effect) Thermoplastic resin can be recycled multiple times. (3) A method for producing recycled resin according to (1) above, comprising the step of mixing and kneading the crushed material and the Charpy strength modifier to obtain recycled resin, and then manufacturing a product of the same category as the product used in the market. (Effect) By using recycled resin, material recycling as a product is possible. (4) A recycled resin composed of thermoplastic resin contained in the recovered material of resin products, The thermoplastic resin is (A), (B), or (C) below, and has flame retardant properties equivalent to 5V, (A) PC resin (polycarbonate resin) (B) PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) (C) PC resin (polycarbonate resin) and a mixture of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) The content of the Charpy strength modifier relative to the recycled resin is less than 10% by mass. It has flame retardant properties equivalent to 5V, The flexural modulus is 2500 MPa or higher, and the Charpy impact strength is 5.0 kJ / m 2 ) That's all, A recycled resin characterized by the following features. (Effects) It has flame retardant properties equivalent to 5V, and in terms of strength properties, the flexural modulus is 2500 MPa or higher, and the Charpy impact strength is 5.0 (kJ / m 2 Recycled resin having the above characteristics can be provided with a high cutting rate (recovered material loading rate). [Prior art documents] [Patent Documents]

[0051] [Patent Document 1] Japanese Patent Publication No. 2005-289047

Claims

1. A method for manufacturing recycled resin, which uses recovered materials from resin products made of thermoplastic resin as raw materials to regenerate resin, The thermoplastic resin is (A), (B), or (C) below, and has flame retardant properties equivalent to 5V, (A) PC resin (polycarbonate resin) (B) PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) (C) PC resin (polycarbonate resin) and a mixture of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) The manufacturing process includes steps (a) to (d) below. (a) A process of recovering the materials as components of products used in the market. (b) A step to remove seals and particles attached to the parts recovered in step (a) above, (c) A process of crushing the parts obtained in the above process (b) and recovering the crushed material. (d) A step to obtain recycled resin by mixing and kneading the crushed material obtained in step (c) above with a Charpy strength modifier for PC resin (polycarbonate resin). The content of the Charpy strength modifier in the recycled resin is less than 10% by mass. The recycled resin has flame retardant properties equivalent to 5V. The recycled resin has a flexural modulus of 2500 MPa or higher and a Charpy impact strength of 5.0 kJ / m ２ ) That's all, A method for producing recycled resin characterized by the above.

2. The method for producing recycled resin according to claim 1, wherein the recovered material of the resin product is made using recycled resin.

3. A method for producing recycled resin according to claim 1, further comprising the steps of: mixing and kneading the crushed material and the Charpy strength modifier to obtain recycled resin; and then producing a product of the same category as the product used in the market.

4. A recycled resin composed of thermoplastic resin contained in the recovered material of resin products, The thermoplastic resin is (A), (B), or (C) below, and has flame retardant properties equivalent to 5V, (A) PC resin (polycarbonate resin) (B) PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) (C) PC resin (polycarbonate resin) and a mixture of PC resin (polycarbonate resin) / ABS resin (acrylonitrile-butadiene-styrene copolymer resin) The content of the Charpy strength modifier relative to the recycled resin is less than 10% by mass. It has flame retardant properties equivalent to 5V, The flexural modulus is 2500 MPa or higher, and the Charpy impact strength is 5.0 (kJ / m). ２ ) That's all, A recycled resin characterized by the following features.

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