JP2016180074A - Method for recycling waste of thermoplastic resin with coated film and recycled material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recycling a waste of a thermoplastic resin with a coated film which can recycle a coated film without peeling even when an inorganic pigment contained in a coating material is a coated molded product non-corresponding to phase separation; and to provide a recycled material.SOLUTION: In a method for recycling a waste of a thermoplastic resin with a coated film, a waste of a thermoplastic resin with a coated film contains a resin for a coating material compatible with a thermoplastic resin for a base material as a main component and is formed by crushing a molded product coated with a coating material containing an inorganic substance; and a compatibilizer which is compatible with the thermoplastic resin for the base material and the resin for the coating material and has an epoxy group is added to and mixed with the waste of the thermoplastic resin with the coated film.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a recycling method and a recycling material for a thermoplastic resin waste material with a coating film in which a coating film is formed on the surface of a molded product.

  For external parts such as home appliances, a coated molded product in which a surface of a thermoplastic resin is coated is often used for the purpose of imparting designability and scratch resistance. Here, the thermoplastic resin used for the base material of the coated molded article is defined as the thermoplastic resin for the base material, and the resin contained as the main component of the paint is defined as the resin for paint.

  In the recycling of coated molded products, if recycling is performed with the coating film attached, the coating resin is not compatible with the thermoplastic resin for the base material. It is known that the physical properties of a molded article that has been separated and regenerated are reduced.

  In order to solve this problem, Patent Document 1 recycles the coating without peeling off the coating by applying a coating mainly composed of a coating resin that is compatible with the thermoplastic resin for the substrate. Proposed method to do.

  In recent years, metallic paints having excellent design properties are often applied to external parts such as home appliances. The metallic paint contains a large amount of an inorganic pigment such as aluminum flakes. Even in the case of painted products that have been coated with such metallic paints, if they are recycled with a coating film applied, the inorganic pigment will not be compatible with the thermoplastic resin for the substrate and the resin for the paint. There is a problem in that the physical properties of the molded product deteriorated.

  With respect to this problem, in Patent Document 2, compatibility is improved by forming a resin having compatibility with a thermoplastic resin for a substrate and a resin for a coating as a surface treatment in advance on an inorganic pigment such as aluminum flakes. Have proposed a method for suppressing deterioration of physical properties of a regenerated molded product.

Japanese Patent No. 3289914 Japanese Patent No. 3986536

  However, the paint moldings already on the market are not compatible with the phase separation of inorganic pigments as in Patent Document 2, so that the conventional recycling method still has a coating film for recycling. There was a problem that could not be converted.

  The present invention has been made in order to solve the above-described problems, and its purpose is to provide a coating film even for a coating molded article using a paint containing an inorganic pigment that does not support phase separation. An object of the present invention is to provide a recycling method and a recycling material for a thermoplastic resin waste material with a coating film, which can be recycled without peeling.

  The present invention relates to a method for recycling a thermoplastic resin waste material with a coating film, wherein the thermoplastic resin waste material with a coating film is a paint compatible with the thermoplastic resin for a base material with respect to the thermoplastic resin for the base material. This is a crushed molded product with a coating resin containing inorganic resin as the main component and compatible with the thermoplastic resin for coating and the coating resin. It is characterized by adding and mixing a compatibilizer having an epoxy group.

  Moreover, in the recycling method of the thermoplastic resin waste material with a coating film of this invention, an epoxy value is 0.3-3.2 meq / g as a compatibilizing agent, It is characterized by the above-mentioned.

  Moreover, in the recycling method of the thermoplastic resin waste material with a coating film of this invention, adding 0.005-0.1 weight% of a compatibilizer with respect to 100 weight% of thermoplastic resin waste materials with a coating film. Features.

  The present invention also relates to a recycled material obtained by recycling a thermoplastic resin waste material with a coating film, wherein the thermoplastic resin waste material with a coating film is a thermoplastic resin for a substrate relative to a thermoplastic resin for a substrate. It is a crushed molded product that is mainly composed of a resin for paint that is compatible with the resin and coated with a paint containing an inorganic substance. It is compatible with the resin for use and contains a compatibilizer having an epoxy group.

  Further, in the recycled material for waste thermoplastic resin with a coating film of the present invention, the compatibilizer has an epoxy value of 0.3 to 3.2 meq / g.

  Moreover, in the recycled material for thermoplastic resin waste with a coating film of the present invention, a compatibilizer is added in an amount of 0.005 to 0.1% by weight with respect to 100% by weight of the thermoplastic resin waste material with a coating film. It is characterized by that.

  Recycled thermoplastic resin waste with a coating that can be recycled even if it is a molded product that uses a coating that contains an inorganic pigment that does not support phase separation, without peeling off the coating And a recycling material can be provided.

It is a figure for demonstrating the method to collect | recover the thermoplastic resin waste material with a coating film in this invention from a product. It is a figure for demonstrating the recycling method of the thermoplastic resin waste material with a coating film of this invention. It is an example which observed the interface part of the inorganic pigment and resin in the recycling material recycled by this invention with the scanning electron microscope. It is an example which observed the interface part of the inorganic pigment and resin in the recycling material recycled by this invention with the scanning electron microscope. It is a figure which shows the result of having evaluated the Izod impact strength, interface adhesiveness, and durability of Examples 1-6 and Comparative Examples 1-4. It is a figure which shows the result of having evaluated the Izod impact strength of reference examples 1-6, interface adhesiveness, and durability.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.

(Waste thermoplastic resin with coating film)
The thermoplastic resin waste material with a coating film in the present invention is a waste product that has become unnecessary after a long period of use at home, such as a TV such as a liquid crystal television or a plasma television, an air conditioner, a refrigerator, a washing machine, etc. Painted moldings collected from OA equipment such as home appliances, copiers, printers, and scanners.

  The composition of the thermoplastic resin for the base material of the coated molded article may be compatible with the resin for paint. The reason is that when the thermoplastic resin for base material and the resin for paint have compatibility, the characteristic deterioration due to the influence of the resin for paint does not occur. Exemplifying the composition of the thermoplastic resin for the substrate, when a paint mainly composed of an acrylic resin is used, a styrene resin, acrylonitrile / butadiene / styrene resin (ABS resin), a polycarbonate resin (PC resin), and the above-described resin And the like.

  FIG. 1 is a diagram for explaining a method for recovering a waste resin with a coating film from a product according to the present invention. Note that S in the flowchart represents each step.

  First, used products that have been used for a long time at home and discarded are collected (S101).

  Next, the collected products are disassembled and classified for each part such as a large metal part or a large thermoplastic resin molded product (S102).

  Next, parts such as a large thermoplastic resin molded product are roughly crushed with a rough crusher (S103). As the rough crusher, for example, an impact crusher or a shear crusher is used. The particle size of the coarsely crushed material is not particularly limited, but is preferably 10 mm or more, and more preferably 40 mm or more. Moreover, it is preferable that the particle size of a coarsely crushed material is 80 mm or less, and it is more preferable that it is 60 mm or less.

  When the particle size of the coarsely crushed material is less than 10 mm or more than 80 mm, the metal selection accuracy in the next step is lowered. When the particle size is less than 10 mm, it takes a long time for rough crushing, so that the coarsely crushed material is melted or thermally oxidized. On the other hand, when the particle diameter exceeds 80 mm, the bulk specific gravity is reduced, which adversely affects workability in the subsequent steps. In consideration of the above, specifically, it is particularly preferable to roughly pulverize so that the particle size is about 60 mm.

  Next, the metal-based crushed material remaining in the roughly crushed material is sorted by a metal sorter, and only the thermoplastic resin-based crushed material is collected (S104). As the metal sorter, for example, an iron sorter using magnetic force or a copper or aluminum sorter using overcurrent is used. When performing both sorting using magnetic force and sorting using eddy current, the order is not particularly limited, but from the viewpoint of efficiency, iron is first removed by magnetic force, and then copper and aluminum are removed by eddy current. It is preferable.

  Next, the low-bulk specific gravity crushed material remaining in the coarse crushed material is sorted by a wind power sorter, and the low-bulk specific gravity crushed material is removed from the coarse crushed material (S105). The low bulk specific gravity crushed material means a crushed material having a bulk specific gravity of 0.3 or less, for example, a polyurethane-based heat-insulated material, a polystyrene foam-based material, or the like.

  Further, the coarsely crushed material collected in the step S105 is finely crushed with a fine crusher to a particle size of about 10 mm, and the finely crushed material is collected (S106). As the fine crusher, for example, a shearing type crusher is used.

  Further, the finely crushed material is washed to remove foreign matters that could not be removed in the process from S101 to S105, such as dust, sand dust, metal powder, and organic dirt (S107).

  Here, let the finely crushed material obtained through each process of S101-S107 be a thermoplastic resin waste material with a coating film.

  Next, an embodiment of a method for recycling the coated thermoplastic resin waste material collected through the steps S101 to S107 shown in FIG. 1 will be described.

(Recycling method of waste thermoplastic resin with coating)
FIG. 2 is a flowchart for explaining a method of recycling a thermoplastic resin waste material with a coating film according to an embodiment of the present invention. Note that S in the flowchart represents each step.

  First, a compatibilizing agent containing an epoxy group is added to the thermoplastic resin waste material with a coating film collected as shown in FIG. 1 to obtain a mixture (S201).

  The compatibilizing agent is added in the melt-kneading step in order to improve the adhesion between the inorganic substance such as a pigment contained in the coating film and the resin. Since the inorganic substance and the resin are incompatible, the adhesion between them is low. For this reason, the impact strength of the regenerated resin molded product is reduced due to the notch effect starting from the portion where the inorganic substance is present.

  Further, when the resin is hydrolyzable, hydrolysis is promoted by the presence of moisture at the site where the interface between the inorganic substance and the resin is peeled off. As a countermeasure, by adding a compatibilizer having an epoxy group, the OH group and the epoxy group present on the surface of the inorganic substance are bonded to each other, thereby improving the adhesion and suppressing the deterioration of physical properties and durability. .

  Examples of inorganic pigments that can achieve the effects described above include titanium oxide, silica, carbon black, iron oxide, aluminum flakes, and aluminum powder.

  As the compatibilizing agent, a material having an epoxy group and having compatibility with the thermoplastic resin for base material and the resin for paint can be selected and used. Specific examples include acrylonitrile / styrene / glycidyl methacrylate copolymer, methyl methacrylate / glycidyl methacrylate copolymer, and the like.

  The epoxy value of the compatibilizer is preferably in the range of 0.3 to 3.2 meq / g. This is because if the epoxy value is less than 0.3 meq / g, a sufficient adhesion effect cannot be obtained, and if it exceeds 3.2 meq / g, the compatibilizers are cross-linked with each other as foreign matter in the resin. This is because the Izod impact strength tends to decrease.

  The addition amount of the compatibilizer is preferably in the range of 0.005 to 0.1% by weight with respect to 100% by weight of the thermoplastic resin waste material with a coating film. If the amount of the compatibilizer added is less than 0.005% by weight, a sufficient adhesion effect cannot be obtained, and if it exceeds 0.1% by weight, the compatibilizers crosslink and become foreign matter. This is because the Izod impact strength tends to decrease due to the presence in the resin.

  Next, the mixture obtained in the mixing step (S201) is melt-kneaded to obtain a molten mixture (S202). Here, the heating temperature of the melt-kneading is preferably T ° C. or higher, more preferably (T + 10) ° C. or higher, where T ° C. is the lowest temperature at which the entire resin contained in the mixture melts.

  Further, the heating temperature is preferably (T + 120) ° C. or less, and more preferably (T + 60) ° C. or less. By setting the heating temperature of the melt kneading to T ° C. or higher, the entire resin is sufficiently melted, the kneadability is improved, and the mixture is easily molded. Moreover, the thermal deterioration of the recycled material obtained by the recycling method of this invention is suppressed by making the heating temperature in a melt-kneading process into (T + 120) degree C or less.

  Subsequently, the molten mixture in the melted state in the melt-kneading step (S202) is extruded using an extruder to obtain an extruded product (S203). The extruder is not particularly limited, and for example, a single screw extruder or a multi-screw extruder is used.

  Next, the extruded molded body regenerated through the extrusion process (S203) is granulated and formed into a pellet (S204). It is preferable to use a granulation method such as sheet cutting, strand cutting, hot air cutting, underwater cutting, etc., especially when the pelletized recycling material is formed into a specific shape in the subsequent injection molding step (S205). In particular, an underwater cut method in which the supply of the recycled material can be performed smoothly and processed in a large amount is more preferable.

  In addition, there is no restriction | limiting in particular in the shape of the recycling material, Not only a pellet form but shapes, such as a sheet form, a film form, and a pipe form, may be sufficient. Although it may be determined as appropriate from the type of injection molding machine to be used later, the mode of use or the required characteristics, etc., a pellet form is preferred in that uniform melt kneading is easy.

  The particle size of the pellets is preferably in the range of 1.0 mm to 8.0 mm, more preferably 2.0 mm to 5.0 mm. When the particle size of the pellet is less than 1.0 mm, the workability is easily lowered because the pellet floats. When the particle size of the pellet exceeds 8.0 mm, the pellet does not sufficiently melt in the cylinder of the injection molding machine. Uniform kneading tends to be difficult.

  And the pellet-shaped resource recycling material obtained through the granulation shaping | molding process (S204) is thrown into an injection molding machine, and it reproduces | regenerates as a resin molding (S205). As the injection molding machine, for example, a screw inline type injection molding machine, a plunger type injection molding machine or the like is used.

  The resin molded body obtained here can be suitably reused for durable consumer goods such as home appliances such as televisions, air conditioners, refrigerators and washing machines, office automation equipment such as copying machines, and electric / electronic parts.

  Note that the recycling method according to the present invention does not need to include all the steps shown in FIGS. 1 and 2, and at least a thermoplastic resin waste material with a coating film is mixed with a compatibilizing agent containing an epoxy group, A melt-kneading step for melting and kneading the mixture obtained in the mixing step to obtain a molten mixture may be included.

  Moreover, you may abbreviate | omit the step shown by FIG.1 and FIG.2 as needed. For example, when recycling a painted product that does not contain foreign substances such as metal, in order to simplify the process, S103, S104, S105, and S107 are omitted, and complicated steps such as foreign substance separation and cleaning are not performed. good.

  Therefore, a recycled material may be obtained by mixing a thermoplastic resin waste material with a coating film recovered from a used product and finely pulverized as it is, with a compatibilizer having an epoxy group, and melt-kneading with an extruder. . Moreover, you may add the step which is not shown by FIG.1 and FIG.2 as needed.

  Further, the recycled material obtained by the recycling method of the present invention includes a flame retardant, an anti-drip agent, an antioxidant, a heat stabilizer, and a light stabilizer, as long as the effects of the present embodiment are not impaired as necessary. Additives such as antistatic agents, lubricants, fillers, metal deactivators, antibacterial agents and coloring agents may be added.

  Hereinafter, the present invention will be described in more detail with reference to Examples, Comparative Examples, and Reference Examples, but the present invention is not limited to these examples. In addition, evaluation of the test piece obtained by each Example, the comparative example, and the reference example was performed as follows.

<Evaluation method>
(1) Izod impact strength (kJ / m2)
Measurement was performed according to JIS K 7110 using ASTM-compliant physical property measurement specimens.

(2) Interfacial adhesion The test piece for measuring physical properties in accordance with ASTM is cut in half, and the interface between the inorganic pigment (aluminum flakes) and resin (mixture of thermoplastic resin for base material and resin for paint) present in the cross section Observation was made with a scanning electron microscope (manufactured by JEOL Ltd.) to confirm the adhesion between them. FIG. 3 and FIG. 4 are examples of observation results, FIG. 3 shows a state where the inorganic pigment and the resin are partly peeled off, and FIG. 4 shows a state where the inorganic pigment and the resin are well adhered. Yes.

  In addition, 30 sites where inorganic pigments were present were observed, and when the number of locations where the interface was in close contact was 20 or more, it was determined to be ◯, and when it was less than 20 locations, it was determined to be x.

(3) Durability (time)
A test piece for measuring physical properties in accordance with ASTM is put into a constant temperature and humidity chamber at 80 ° C. and 95% RH, and the bending strength is measured in accordance with JIS K7203 at every feeding time. The time until the bending strength was reached was defined as the life of the test piece and used as an index of durability.

<Sample for evaluation>
The composition of the thermoplastic resin waste material and the compatibilizer used in each Example, Comparative Example and Reference Example is shown below.

Waste thermoplastic resin with coating (A1): Waste thermoplastic resin with coating recovered from 100 waste LCD TVs (Base material thermoplastic resin: PC + ABS resin, Paint resin: Acrylic resin, Aluminum flakes as inorganic pigment) Contains)
Film-free thermoplastic resin waste (A2): Film-free thermoplastic resin waste recovered from 100 waste liquid crystal televisions (substrate thermoplastic resin: PC + ABS resin)
Compatibilizer (B1) Methyl methacrylate / glycidyl methacrylate copolymer (weight average molecular weight: 10,000, epoxy value: 0.3 meq / g)
Compatibilizer (B2) Methyl methacrylate / glycidyl methacrylate copolymer (weight average molecular weight: 10,000, epoxy value: 3.2 meq / g)
Compatibilizer (B3) Methyl methacrylate / glycidyl methacrylate copolymer (weight average molecular weight: 10,000, epoxy value: 0.08 meq / g)
Compatibilizer (B4) Methyl methacrylate / glycidyl methacrylate copolymer (weight average molecular weight: 10,000, epoxy value: 5.2 meq / g)
<Amount of inorganic pigment in specimen>
According to the procedure shown in FIG. 1 and FIG. 2, the thermoplastic resin waste material with a coating film was recycled, and a test piece for measuring physical properties in accordance with ASTM standards was produced as a recycled material.

  First, 100 liquid crystal televisions that were used and discarded for a long period of time at home were disassembled, and the thermoplastic resin waste material (A1) with a coating film that was finely crushed to about 10 mm was collected according to the procedure of FIG. The thermoplastic resin waste material with coating film (A1) was dehumidified and dried at 80 ° C. for 5 hours with a hot air dehumidifying dryer (manufactured by Matsui Seisakusho Co., Ltd.).

  Next, the thermoplastic resin waste material with a coating film (A1) was put into a biaxial melt kneading extruder (manufactured by Technobel Co., Ltd.), and melt kneaded at a set temperature of 250 ° C. to obtain a molten mixture. Furthermore, the obtained molten mixture was extrusion-molded with the above-mentioned biaxial melt-kneading extruder to obtain an extruded product. The obtained extruded product was cut with a pelletizer to obtain a pellet-shaped recycled material. Using the obtained pellet-shaped recycled material, using a 10-ton injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd.), conforms to ASTM under injection molding conditions of a set temperature of 260 ° C, a mold temperature of 60 ° C, and a cooling time of 30 seconds. A test piece for measuring physical properties was prepared.

  In order to examine the amount of inorganic pigment (aluminum flakes) contained in the test piece, first, the amount of the acrylic resin component of the paint contained in the test piece was measured with a gas chromatograph mass spectrometer (manufactured by Agilent Technologies). In order to create a calibration curve, a PC + ABS resin virgin material was used, and test specimens for measuring physical properties were prepared by arbitrarily changing the mixing amount of the acrylic metallic paint.

  As a result of the measurement, the amount of the acrylic resin component contained in the test piece was 0.5% by weight. In general, it is known that the composition of a vehicle of an acrylic metallic paint used for coating molded products such as OA equipment is resin content: 80% by weight and inorganic pigment content: 20% by weight. Therefore, the amount of aluminum flakes contained in the test piece was 0.1% by weight.

  In the case where the thermoplastic resin waste material with a coating film (A1) is used as a raw material in the examples, comparative examples, and reference examples described below, since the same waste material is used, aluminum flakes contained in the test piece are used. Is the same amount.

<Example 1>
According to the procedure shown in FIG. 1 and FIG. 2, the thermoplastic resin waste material with a coating film was recycled, and a test piece for measuring physical properties in accordance with ASTM standards was produced as a recycled material.

  First, the liquid crystal television used and discarded for a long time at home was disassembled, and the thermoplastic resin waste material (A1) with a coating film finely crushed to about 10 mm was collected according to the procedure of FIG. The thermoplastic resin waste material with coating film (A1) was dehumidified and dried at 80 ° C. for 5 hours with a hot air dehumidifying dryer (manufactured by Matsui Seisakusho Co., Ltd.).

  Subsequently, the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B1) were mixed in an amount of 100: 0.005. Moreover, in order to improve the impact resistance and hydrolysis resistance of the thermoplastic resin for a base material, which has deteriorated due to use over time, the additives disclosed in JP-A-2014-125491 (silicate compounds, acrylic rubbers and carbodiimide compounds) ) Was added in an appropriate amount to obtain a homogenized mixture using a tumbler mixer.

  Next, the mixture was put into a biaxial melt kneading extruder (manufactured by Technobel Co., Ltd.) and melt kneaded at a set temperature of 250 ° C. to obtain a molten mixture. Furthermore, the obtained molten mixture was extrusion-molded with the above-mentioned biaxial melt-kneading extruder to obtain an extruded product. The obtained extruded product was cut with a pelletizer to obtain a pellet-shaped recycled material. Using the obtained pellet-shaped recycled material, using a 10-ton injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd.), conforms to ASTM under injection molding conditions of a set temperature of 260 ° C, a mold temperature of 60 ° C, and a cooling time of 30 seconds. A test piece for measuring physical properties was prepared.

<Example 2>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B1) were mixed in an amount of 100: 0.05.

<Example 3>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B1) were mixed in an amount of 100: 0.1.

<Example 4>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B2) were mixed in an amount of 100: 0.005.

<Example 5>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B2) were mixed in an amount of 100: 0.05.

<Example 6>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B2) were mixed in an amount of 100: 0.1.

<Comparative Example 1>
In the mixing process, it carried out like Example 1 except not mixing a compatibilizer with the thermoplastic resin waste material (A1) with a coating film.

<Comparative example 2>
According to the procedure shown in FIG. 1, the thermoplastic resin waste material (A2) without a coating film was recovered. The mixing step was performed in the same manner as in Example 1 except that the compatibilizer was not mixed.

<Comparative Example 3>
According to the procedure shown in FIG. 1, the thermoplastic resin waste material (A2) without a coating film was recovered. In the mixing step, the same procedure as in Example 1 was performed except that the thermoplastic resin waste material without coating (A2) and the compatibilizer (B1) were mixed in an amount of 100: 0.1.

<Comparative example 4>
According to the procedure shown in FIG. 1, the thermoplastic resin waste material (A2) without a coating film was recovered. In the mixing step, the same procedure as in Example 1 was performed except that the thermoplastic resin waste material without coating (A2) and the compatibilizer (B2) were mixed in an amount of 100: 0.1.

<Reference Example 1>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B1) were mixed in an amount of 100: 0.001.

<Reference Example 2>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B1) were mixed in an amount of 100: 0.3.

<Reference Example 3>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B2) were mixed in an amount of 100: 0.001.

<Reference Example 4>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B2) were mixed in an amount of 100: 0.3.

<Reference Example 5>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B3) were mixed in an amount of 100: 0.05.

<Reference Example 6>
The mixing step was performed in the same manner as in Example 1 except that the thermoplastic resin waste material with a coating film (A1) and the compatibilizer (B4) were mixed in an amount of 100: 0.05.

  Below, the result of having evaluated the Izod impact strength, interface adhesiveness, and durability of Examples 1-6, Comparative Examples 1-4, and Reference Examples 1-6 is demonstrated using FIG. 5, FIG.

  From FIG. 5, compared with the comparative example 2, in the comparative example 1, the Izod impact strength and durability are falling under the influence of the inorganic pigment contained in a coating film by mixing.

  In Examples 1-6, since the epoxy value and addition amount of the compounded compatibilizers (B1, B2) are in an appropriate range, the adhesiveness between the inorganic pigment and the resin is improved, resulting in the influence of coating film mixing Reduction in Izod impact strength and durability is suppressed.

  Further, in Comparative Examples 3 and 4, even if the compatibilizer (B1, B2) is added to the thermoplastic resin waste material (A2) without a coating film, no effect is seen on the physical properties and durability. It turns out that a compatibilizing agent (B1, B2) has an effect with respect to the inorganic pigment contained in a coating film.

  On the other hand, in Reference Examples 1 and 3, the epoxy value of the compatibilizers (B1, B2) is within an appropriate range, but since the addition amount is below the appropriate range, the effect of the compatibilizer is sufficient. No reduction in Izod impact strength and durability has been obtained.

  Further, in Reference Examples 2 and 4, since the amount of the compatibilizers (B1, B2) added exceeds the appropriate range, the compatibilizers are cross-linked to become foreign matters, so that the Izod impact strength is reduced. doing.

  In Reference Example 5, the amount of the compatibilizer (B3) added is within an appropriate range, but the effect of the compatibilizer cannot be sufficiently obtained because the epoxy value is below the appropriate range. The drop in Izod impact strength and durability is not improved.

  In Reference Example 6, the amount of the compatibilizer (B4) added is within an appropriate range, but since the epoxy value exceeds the appropriate range, the compatibilizers crosslink and become foreign matters. Thus, the Izod impact strength is reduced.

  As explained above, according to the method for recycling waste plastic material with a coating film according to the present invention, an appropriate amount of a compatibilizer having an appropriate epoxy value is added to the thermoplastic resin waste material with a coating film. Thus, a recycled material having characteristics that can be reused for durable consumer goods can be obtained.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and the embodiments can be obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

Claims (6)

A method for recycling thermoplastic resin waste with a coating,
The thermoplastic resin waste material with a coating film is coated with a coating material that contains a coating resin that is compatible with the thermoplastic resin for the base material and contains an inorganic substance, with respect to the thermoplastic resin for the base material. The molded product is crushed,
A coating film characterized in that the thermoplastic resin waste material with a coating film is compatible with the thermoplastic resin for a base material and the resin for a coating material, and is added and mixed with a compatibilizing agent having an epoxy group. To recycle waste thermoplastic resin.   2. The method for recycling a thermoplastic resin waste material with a coating film according to claim 1, wherein the compatibilizing agent has an epoxy value of 0.3 to 3.2 meq / g.   3. The thermoplastic resin waste material with a coating film according to claim 1, wherein the compatibilizer is added in an amount of 0.005 to 0.1 wt% with respect to 100 wt% of the thermoplastic resin waste material with a coating film. Recycling method. Recycled material made from recycled thermoplastic resin waste with coating,
The thermoplastic resin waste material with a coating film is coated with a coating material that contains a coating resin that is compatible with the thermoplastic resin for the base material and contains an inorganic substance, with respect to the thermoplastic resin for the base material. The molded product is crushed,
The waste plastic material with a coating film is compatible with the thermoplastic resin for a base material and the resin for a paint, and contains a compatibilizer having an epoxy group. material.   The recycling material according to claim 4, wherein the compatibilizing agent has an epoxy value of 0.3 to 3.2 meq / g.   The recycled material according to claim 4 or 5, wherein the compatibilizer is added in an amount of 0.005 to 0.1% by weight based on 100% by weight of the thermoplastic resin waste material with a coating film.