JP2013237719A - Method of producing recycled polypropylene resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of recycling a polypropylene resin-made exterior members for vehicle, without classifying it into a polypropylene resin-made exterior member for vehicle to which a solvent-based coating material is applied and a polypropylene resin-made exterior member for vehicle to which a water-based coating material is applied, and without deteriorating physical properties of a polypropylene resin molded product.SOLUTION: A method of producing a recycled polypropylene resin molded product includes: a step of bringing a crushed product of an exterior member for vehicle, comprising a polypropylene resin molded product and a resin coating film, into contact with a first coating film remover containing at least one of d-limonene and benzyl alcohol and butyl cellosolve; a step of subjecting the crushed product to physical exfoliation treatment, while bringing the crushed product from which most part of a coating film is removed through the previous step, into contact with a second coating film remover containing at least one of d-limonene and benzyl alcohol and butyl cellosolve; a step of producing a polypropylene resin pellet from the crushed product from which the rest of the coating film is removed through the previous step; and a step of producing a polypropylene resin molded product from the polypropylene resin pellet.

Description

  The present invention relates to a method for producing a recycled polypropylene resin molded body, and more particularly, a polypropylene resin is regenerated from a polypropylene resin automobile exterior member provided with a resin coating film, and a polypropylene resin molded body is produced using the polypropylene resin. It relates to a method of manufacturing.

  Polypropylene resins are highly versatile, inexpensive, and excellent in various physical properties, and are used for automotive exterior members such as automotive bumpers. Various methods have been studied for the recycling of such polypropylene resin automotive exterior members, but the surface of the automotive exterior member is usually painted, and this resin coating is used. Since the film deteriorates the physical properties of the recycled polypropylene resin molded article, it has been a big problem in recycling the exterior member made of polypropylene resin for automobiles.

  Therefore, in order to suppress the deterioration of the physical properties of the recycled polypropylene resin molded product, a method of peeling the resin coating film by physical peeling treatment using an abrasive or chemical peeling treatment using a coating film peeling agent. Was being considered. However, in the physical peeling treatment, the resin coating film cannot be sufficiently peeled off, and the recycled polypropylene resin molded article still has the problem of deterioration in physical properties, and automobiles that require strength such as bumpers It cannot be used as an exterior member for automobiles, and has only been used in applications where strength is not so required. Also in chemical stripping treatment, conventional coating strippers contain halogen-based solvents, amine-based solvents, strong acids or strong alkalis. In addition, since the polypropylene-based resin molded product is also decomposed, the polypropylene-based resin molded product is deteriorated by the peeling treatment, and it is difficult to sufficiently suppress a decrease in physical properties of the recycled polypropylene-based resin molded product.

  On the other hand, Japanese Patent Laid-Open No. 2000-198953 (Patent Document 1) discloses a method in which a paint softener comprising a glycol ether or an acetate thereof and a coating film are brought into contact with each other, and polished with a polishing material to peel the coating film. It is disclosed. Japanese Patent Laid-Open No. 2002-177786 (Patent Document 2) discloses a method of peeling a coating film by crushing the coating film with an abrasive and then applying a release agent to the surface of the crushed coating film. Yes.

JP 2000-198953 A JP 2002-177876 A

  However, in recent years, resin coatings that are difficult to scratch and resin coatings that are easily self-healing have been developed, and such resin coatings are more difficult to peel off. The coating film was likely to remain, and it was further difficult to sufficiently suppress the deterioration of the physical properties of the recycled polypropylene resin molded product.

  In addition, conventional coating film release agents are roughly classified into water-based and solvent-based ones, and it has been possible to remove either water-based resin coatings or solvent-based resin coatings. It was difficult to peel the coating film. For this reason, when a polypropylene resin molded article having an aqueous resin coating film and a polypropylene resin molded article having a solvent resin coating film are mixed, the method described in Patent Document 1 or 2 is applied. There is a problem that either one of the coating films is not sufficiently peeled off and remains, and when the exterior member for automobile made of polypropylene resin is recycled, according to the type of the resin coating film, it is separated in advance. There was a need.

  The present invention has been made in view of the above-described problems of the prior art, and can regenerate a polypropylene resin automotive exterior member without deteriorating the physical properties of the resulting polypropylene resin molded article. Even when a polypropylene resin automotive exterior member painted with a solvent-based paint and a polypropylene resin automotive exterior member painted with a water-based paint are mixed, they can be regenerated without separation. It aims to provide a simple method.

  As a result of intensive studies to achieve the above object, the present inventors have conducted chemical stripping using a first coating stripping agent containing at least one of d-limonene and benzyl alcohol and butyl cellosolve. The coating was then applied with a solvent-based paint by performing a physical stripping treatment using a second coating stripper containing at least one of d-limonene and benzyl alcohol and butyl cellosolve. Polypropylene resin automotive exterior members and polypropylene resin automotive exterior members painted with water-based paints can reliably remove the resin coating, and the recycled polypropylene resin molded body The present inventors have found that the physical properties are sufficiently high and have completed the present invention.

  That is, the method for producing a recycled polypropylene resin molded body according to the present invention includes a crushed object of an automotive exterior member comprising a polypropylene resin molded body and a resin coating, at least one of d-limonene and benzyl alcohol, and Contacting the first coating film release agent containing butyl cellosolve to obtain a crushed material in which a part of the resin coating film remains, and the crushed material in which a part of the resin coating film remains. The crushed material is subjected to a physical peeling treatment while contacting with at least one of d-limonene and benzyl alcohol and a second coating film release agent containing butyl cellosolve, and the remaining resin coating film is formed from the crushed material. Removing the resin coating film, recovering the crushed material from which the resin coating film has been removed to produce polypropylene resin pellets, and the polypropylene resin A step of producing a polypropylene resin molded article with Rett and is characterized in that it comprises a. The polypropylene resin molded body regenerated in this way can be used as an automotive exterior member.

  In the method for producing a recycled polypropylene resin molded body of the present invention, it is preferable that the second coating film release agent further contains water. Furthermore, at least one of formic acid and toluenesulfonic acid is contained in at least one of the first and second coating film release agents, and a nonionic surfactant is contained. It is preferable.

  Further, in the method for producing a recycled polypropylene resin molded body of the present invention, when the automobile exterior member further includes a primer layer between the resin coating film and the polypropylene resin molded body, It is possible to remove the primer layer from the crushed material together with the resin coating film.

  According to the present invention, it is possible to reliably remove the resin coating on the surface of the polypropylene resin molded body without deteriorating the physical properties of the obtained polypropylene resin molded body, and to recycle the polypropylene resin automotive exterior member. It is possible to make sure. Moreover, even when a polypropylene resin automotive exterior member painted with a solvent-based paint and a polypropylene resin automotive exterior member painted with a water-based paint are mixed, they can be reproduced without separation. Is possible.

  Hereinafter, the present invention will be described in detail with reference to preferred embodiments thereof.

  The method for producing a recycled polypropylene resin molded body according to the present invention comprises: a crushed product of an automotive exterior member comprising a polypropylene resin molded body and a resin coating; at least one of d-limonene and benzyl alcohol; and butyl cellosolve. A process (chemical peeling process) of obtaining a crushed material in which a part of the resin coating film remains by contacting the first coating film release agent contained, and a part of the resin coating film remains The crushed material is subjected to a physical peeling treatment while contacting the crushed material with a second coating film release agent containing at least one of d-limonene and benzyl alcohol and butyl cellosolve, and remains from the crushed material. Removing the resin coating film (physical peeling process) and collecting the crushed material from which the resin coating film has been removed to produce polypropylene resin pellets ( Grain process), a step of preparing a polypropylene resin molded article using the polypropylene resin pellets (molding step), the method comprising.

  When the crushed material of an automotive exterior member and the first coating film release agent are brought into contact with each other, all the resin coating films may be removed from the crushed material, but the type and thickness of the resin coating film, the crushed material Depending on the size, shape, contact conditions (temperature and time) between the crushed material and the first coating film release agent, a part of the resin coating film often remains. The method for producing a recycled polypropylene-based resin molded article of the present invention is such that the crushed material is physically peeled while contacting the crushed material in which part of the resin coating film remains with the second coating film release agent. Is applied to remove the resin coating from the crushed material almost completely to obtain a recycled polypropylene resin molded product having sufficiently high physical properties.

<Automobile exterior member and its crushed material>
First, an automotive exterior member that can be regenerated by the present invention and a crushed product thereof will be described. The exterior member for automobiles used in the present invention includes a polypropylene resin molded body and a resin coating film formed on at least a part of the surface thereof. Moreover, in such an automotive exterior member, a primer layer may be further formed between the resin coating film and the polypropylene resin molded body. Such automobile exterior members include automobile bumpers and the like. Further, such an automobile exterior member may be defective in the automobile manufacturing process, or may be removed from a discarded automobile.

  The polypropylene resin molded body (hereinafter abbreviated as “PP resin molded body”) is not particularly limited as long as it is used for an automotive exterior member such as an automobile bumper. Extruded molded products, injection molded products, foamed molded products, and the like. Moreover, rubber components such as ethylene-propylene copolymer rubber and ethylene-propylene-diene copolymer rubber may be blended with such a PP resin molded body. Furthermore, various additives such as fillers, pigments, antioxidants, ultraviolet absorbers, and heat stabilizers may be blended.

  The resin coating film is not particularly limited as long as it is formed by a paint used for coating automotive exterior members such as automotive bumpers. For example, acrylic urethane resin coating film, urethane resin coating film, acrylic resin Examples thereof include a coating film made of an organic resin such as a coating film, a polyester resin coating film, a melamine resin coating film, and a phenol resin coating film. These resin coating films may be aqueous resin coating films formed from aqueous resins or solvent-based resin coating films formed from solvent-based resins. In the present invention, a resin PP film can be reliably removed, and a recycled PP resin molded article having predetermined physical properties can be obtained regardless of whether it is an automotive exterior member provided with either an aqueous or solvent-based resin film. be able to. The resin coating film may be a single layer or a multilayer of two or more layers. In particular, in the present invention, it is possible to remove a multilayer resin coating film in which an aqueous resin coating film and a solvent-based resin coating film are mixed. Although there is no restriction | limiting in particular as a film thickness of such a resin coating film, Usually, it is 5-50 micrometers. When the film thickness of the resin coating exceeds the upper limit, the resin coating may not be completely removed.

  Moreover, as said primer layer, what was formed with the undercoat of the exterior member for motor vehicles, such as a bumper for motor vehicles, is mentioned. Such undercoat paints include water-based and solvent-based chlorinated polyolefin resin paints. In the present invention, regardless of whether the primer layer is aqueous or solvent-based, both the resin coating film can be reliably removed, and a recycled PP resin molded article having predetermined physical properties is obtained. Can do. Although there is no restriction | limiting in particular as thickness of such a primer layer, Usually, it is 5-20 micrometers. If the thickness of the primer layer exceeds the upper limit, the primer layer may not be completely removed.

  In the present invention, such an automotive exterior member is crushed with a crusher or the like and then brought into contact with a coating film release agent. Although there is no restriction | limiting in particular as a magnitude | size of a crushed material, Usually, it grind | pulverizes into 10 mm square-100 mm square. If the size of the crushed material is less than the lower limit, the crushed material after peeling the coating film and the coating film release agent may not be easily separated. On the other hand, if the size exceeds the upper limit, In some cases, the contact area of the resin layer decreases and the resin coating film and primer layer cannot be sufficiently removed.

<Coating film remover>
Next, the coating film release agent used when removing the resin coating film will be described. The first coating film release agent used in the chemical peeling process and the second coating film release agent used in the physical peeling process according to the present invention are both at least one of d-limonene and benzyl alcohol, and It contains butyl cellosolve. In the present invention, the first and second coating film release agents may have the same composition or different compositions. By using such a coating film release agent, it is possible to easily remove any aqueous or solvent-based resin coating film and primer layer from the crushed material without deteriorating the PP resin. As a result, even when an aqueous and solvent-based resin coating film and a primer layer are mixed, it is possible to remove them from the crushed material without separating them. Moreover, since the coating film release agent containing such a component does not easily remain in the pulverized PP resin molded body obtained in the physical peeling process described later, odor generation occurs in the granulating process described later. And the working environment at the time of manufacturing the recycled PP resin molded body is improved.

  As content of d-limonene and benzyl alcohol in each coating film peeling agent, 5-80 mass% is preferable, 5-50 mass% is more preferable, 10-45 mass% is especially preferable. If the content of d-limonene and benzyl alcohol is less than the lower limit, the peelability of the resin coating film tends not to be sufficiently obtained. On the other hand, if the content exceeds the upper limit, d-limonene is excessive in the PP resin molding. Or benzyl alcohol adheres to the surface of the molded PP resin, and in any case, the coating film release agent tends to remain on the PP resin.

  Moreover, it is preferable to use together d-limonene and benzyl alcohol from a viewpoint that the peelability of a resin coating film improves. In this case, the mass ratio of d-limonene to benzyl alcohol is preferably d-limonene: benzyl alcohol = 0: 100 to 25:75, and more preferably 3:97 to 20:80. When the mass ratio of d-limonene and benzyl alcohol is less than the lower limit, the peelability of the resin coating film may not be sufficiently improved. On the other hand, when the upper limit is exceeded, d-limonene is excessive in the PP resin molded product. It tends to permeate and remain in the PP resin.

  As content of butyl cellosolve in each coating-film remover, 20-95 mass% is preferable, 20-85 mass% is more preferable, 30-60 mass% is especially preferable. When the content of butyl cellosolve is less than the above lower limit, the action of swelling the resin coating film is remarkably reduced, and the peelability of the resin coating film tends to be insufficient. The action of the coating film peeling agent that peels off from the PP resin molded product tends to decrease, and the peelability of the resin coating film tends to be insufficient.

  In the present invention, it is preferable that at least one of formic acid and toluenesulfonic acid is further included in at least one (preferably both) of the first and second coating film release agents. Thereby, it exists in the tendency for the peelability of a resin coating film to improve. As content of formic acid and toluenesulfonic acid in each coating film peeling agent, 0-35 mass% is preferable, 2-30 mass% is more preferable, 3-25 mass% is especially preferable. When the content of formic acid and toluenesulfonic acid is less than the lower limit, the cracking action on the resin coating film is reduced, so that the peelability of the resin coating film tends to be insufficient, and on the other hand, when the upper limit is exceeded. The stability of the coating film release agent tends to decrease, for example, the coating film release agent separates over time.

  Moreover, it is preferable that at least one (preferably both) of the first and second coating film release agents contains a nonionic surfactant. Thereby, it exists in the tendency for the peelability of a resin coating film to improve. Examples of such nonionic surfactants include alkylene oxide adducts of higher alcohols, and among them, C10-22 saturated or unsaturated aliphatics from the viewpoint of improving the peelability of the resin coating film. Alkylene oxide (2 to 4 carbon atoms) adducts are preferable, and ethylene oxide adducts of the aliphatic alcohols are more preferable. Moreover, as addition mole number of alkylene oxide, 4 mol or more is preferable and 6-20 mol is more preferable. As content of the nonionic surfactant in each coating film peeling agent, 0-5 mass% is preferable. Even when a nonionic surfactant in an amount exceeding the upper limit is contained, no further penetration effect is observed, and the peelability of the resin coating film tends to be difficult to improve. Moreover, in order to fully obtain the addition effect of a nonionic surfactant, it is preferable that content of a nonionic surfactant is 1 mass% or more. In addition, as an upper limit of content of a nonionic surfactant, 10 mass% or less is preferable, and 5 mass% or less is more preferable.

  It is preferable that at least one (preferably both) of the first and second coating film release agents contains water. Thereby, the danger of ignition of a coating film peeling agent can be reduced. In addition, if water is contained in the second coating film release agent, the motility of the crushed material, abrasive, etc., when the resin coating film is physically peeled off by flowing the crushed material, abrasive, etc. And the fluidity is increased, and the shearing force and frictional force applied to the crushed material are increased to improve the peelability of the resin coating film. As content of the water in each coating film peeling agent, 0-30 mass% is preferable. If the water content exceeds the upper limit, the risk of ignition of the coating film release agent decreases, but the resin film tends to be insufficiently peelable.

  Each coating film release agent may contain a glycol solvent such as diethylene glycol. Such a glycol solvent acts as a peeling aid when the resin coating film is peeled off. Although there is no restriction | limiting in particular as content of the glycol type solvent in a coating film peeling agent, 0-20 mass% is preferable.

  The coating film release agent containing each of the above components is usually strongly acidic. In the present invention, it is possible to use the strongly acidic coating film release agent as it is, but from the viewpoint of handling safety, the prevention of corrosion of the machine used in the peeling treatment, and the recycled PP resin molded article. From the viewpoint of suppressing the deterioration of physical properties, it is preferable to adjust the pH to 4 to 10 by adding an alkali component to each coating film release agent. Although there is no restriction | limiting in particular as said alkali component, Sodium hydroxide, potassium hydroxide, etc. are preferable.

  In the present invention, such first and second coating film release agents are respectively prepared (including the case where they are collectively prepared and divided into two) and used in the chemical peeling process and the physical peeling process. Alternatively, the first coating remover after use in the chemical peeling step may be used as it is in the physical peeling step as the second coating peeling agent, or used in the chemical peeling step. The first coating film release agent after being appropriately replenished with each component may be used as the second coating film release agent in the physical peeling process.

<Chemical peeling process>
The chemical peeling step according to the present invention is a step of bringing the crushed material of an automotive exterior member provided with a PP resin molded body and a resin coating film into contact with the first coating film release agent. As a result, all of the resin coating film may be removed from the crushed material, but in most of the aqueous and solvent-based resin coating films, most of the resin coating film may be removed, but a part of the resin coating film may remain. Many. In addition, when a primer layer is formed between the PP resin molded body and the resin coating film, most of the primer layer is removed together with most of the resin coating film in both aqueous and solvent-based primer layers. However, there are many cases where some remain. There are no particular restrictions on the remaining amount (area ratio) of the resin coating and primer layer after chemical release treatment, but it is more than 0% and less than 100% (removed amount (area ratio) is more than 0% and less than 100%). More preferably, it is more than 0% and less than 75% (25% or more and less than 100% as removal amount (area ratio)), more preferably more than 0% and less than 50% (50% or more and less than 100% as removal amount (area ratio)) preferable. If the residual amount of the resin coating film and the primer layer after the chemical peeling treatment exceeds the upper limit, it tends to be difficult to completely remove the resin coating film and the primer layer even if the physical peeling treatment described below is performed. is there.

  In the chemical peeling step according to the present invention, as a method of bringing the crushed material into contact with the first coating film peeling agent, a method of immersing the crushed material in the first coating film peeling agent, The method of applying, spraying, or showering a coating film release agent can be mentioned, but from the viewpoint that the peelability of the resin coating film is high and the use amount of the coating film release agent is good, the method by immersion is used. preferable. Moreover, in the method by immersion, the coating film remover is circulated using a pump, etc., the coating film remover is subjected to ultrasonic treatment to vibrate, or the coating film remover is stirred using a stirrer. It is preferable to do. Thereby, most of the resin coating film and the primer layer can be peeled off in a relatively short time.

  Although there is no restriction | limiting in particular as temperature of such a chemical peeling process, 20-130 degreeC is preferable and 70-100 degreeC is more preferable. In the present invention, since the chemical release treatment is performed using the first coating film release agent containing the above-described components, most of the resin coating film and the primer layer are molded with a PP resin at such a relatively low temperature. It becomes possible to peel from the body. That is, in the present invention, it is not necessary to perform the chemical peeling treatment at a temperature exceeding the upper limit, and it is possible to achieve environmental consideration, workability improvement, and cost reduction. On the other hand, when a conventional coating film peeling agent is used, it is necessary to perform a chemical peeling treatment at a higher temperature. In the present invention, when the temperature of the chemical peeling treatment is less than the lower limit, it may be impossible to peel most of the resin coating film and the primer layer in a short time.

  Moreover, when the chemical peeling treatment is performed using the first coating film release agent containing the above-described components, most of the resin coating film and the primer layer can be peeled from the PP resin molded body in a relatively short time. it can. In the present invention, since the physical peeling treatment is further performed after the chemical peeling treatment, the time for the chemical peeling treatment can be further shortened. As a result, it becomes possible to further suppress deterioration in physical properties of the PP resin molded body, together with improvement in workability and cost reduction. On the other hand, when a conventional coating film peeling agent is used, the time required for the chemical peeling treatment becomes longer, and the physical properties of the PP resin molded product tend to be lowered.

  The time for the chemical peeling treatment according to the present invention depends on the kind of the first coating film peeling agent and the temperature of the chemical peeling treatment, and is appropriately set, but is usually 5 to 600 minutes. (Preferably 10 to 60 minutes, more preferably 15 to 30 minutes). If the time of the chemical peeling treatment is less than the lower limit, the resin coating film and the primer layer may not be sufficiently removed even if the physical peeling treatment is performed. On the other hand, even if the chemical peeling treatment is performed for a time exceeding the upper limit, the peelability of the resin coating film tends not to be further improved.

<Physical peeling process>
In the physical peeling step according to the present invention, the crushed material after the chemical peeling treatment (part of which the resin coating film remains) and the second coating film release agent are brought into contact with each other, This is a step of subjecting the crushed material to a physical peeling treatment. At this time, the crushed material after the chemical peeling treatment may be subjected to a physical peeling treatment without being separated from the first coating peeling agent, and the first coating peeling agent and After separating and collecting, it may be subjected to physical peeling treatment. There is no restriction | limiting in particular as a separation method of the said crushed material and a 1st coating film peeling agent, Well-known solid-liquid separation methods, such as filtration and centrifugation, are mentioned.

  For example, when the crushed material is immersed in the first coating film release agent in the chemical peeling step, the dispersion containing the crushed material after the chemical peeling treatment and the first coating film peeling agent is used as it is. Alternatively, the components may be appropriately replenished in the dispersion and the composition may be readjusted, and then subjected to physical peeling treatment. The crushed material after the chemical peeling treatment may be used as the first coating film peeling agent. After separating and collecting the composition, the separated first coating film release agent can be used as it is as the second coating film peeling agent, or each component can be appropriately supplemented to the separated first coating film peeling agent. Using a film release agent that has been readjusted, or using a film release agent prepared separately, the crushed material after the chemical release treatment may be subjected to a physical release treatment.

  Moreover, when the 1st coating film peeling agent was apply | coated, sprayed, or showered to the crushed material in the said chemical peeling process, the 1st used in the said chemical peeling process as a 2nd coating film peeling agent The film remover can be used as it is, or the first film remover used in the chemical peeling step can be supplemented with each component as appropriate to re-adjust the composition, or separately prepared. Using the applied coating remover, a physical release treatment can be applied to the crushed material after the chemical release treatment.

  In this way, the physical release treatment is performed while the second coating film release agent is in contact with the crushed material (the resin coating film partially remains) after the chemical peeling treatment is performed. Thus, the resin coating film remaining on the crushed material can be reliably removed. Moreover, when the primer layer remains in the crushed material, this primer layer can also be reliably removed together with the resin coating film. Furthermore, even if the resin coating film and the primer layer are either aqueous or solvent-based, they can be reliably removed.

  Needless to say, the remaining amount (area ratio) of the resin coating film and the primer layer after the physical release treatment according to the present invention is preferably 0%, but if it is less than 5%, the regenerated PP resin molding The physical properties of the body are high enough to satisfy the physical properties of the extrapolation member for automobiles. On the other hand, if the remaining amount (area ratio) of the resin coating film and primer layer after the physical release treatment exceeds the upper limit, the physical properties of the regenerated PP resin molded product tend to be lowered.

  Thus, in the physical peeling step according to the present invention, since the PP resin molded body from which the resin coating film and the primer layer are surely removed is obtained, in order to suppress deterioration of the physical properties of the PP resin molded body, Before the granulation step described later, the PP resin molded body is separated into those having the resin coating film remaining and those not remaining, or by mixing the virgin resin in the molding process described later. It becomes unnecessary to adjust the physical properties.

  In the physical peeling step according to the present invention, as a method of bringing the crushed material and the second coating film peeling agent into contact, physical peeling, which will be described later, while bringing the crushed material and the second coating film peeling agent into contact with each other. The method is not particularly limited as long as it can be treated, but from the viewpoint that the physical release treatment can be easily performed while the crushed material and the second coating film release agent are in contact with each other, A method of immersing in the second coating film release agent and a method of applying and spraying the second coating film release agent on the surface of the crushed material or showering are preferred.

  Further, in the physical peeling step according to the present invention, as a method of subjecting the crushed material to physical peeling, the surface of the crushed material is hit, scratched, rubbed, etc. There is no particular limitation as long as it is a method capable of peeling the resin coating film and the primer layer by applying a physical force such as frictional force. For example, by flowing crushed materials and other solid materials, Examples thereof include a method of colliding or rubbing with other solid materials, and a method of spraying abrasive powder on the surface of the crushed material.

  Examples of a method for performing a physical peeling treatment while contacting the crushed material and the second coating film release agent (hereinafter referred to as “physical peeling treatment method according to the present invention”) include, for example, a crushed material, Examples include barrel polishing in which a medium (polishing stone) and a second coating film release agent are put into a polishing tank, and the crushed material is polished by moving the polishing tank. As a motion mode of this barrel polishing, any of a vibration type, a rotary type, a flow type, and a centrifugal type may be used, but from the viewpoint of obtaining a high polishing ability, a flow type and a centrifugal type are preferable.

  Further, as another example of the physical peeling treatment method according to the present invention, a method of polishing a crushed material by stirring a liquid mixture containing a crushed material, a medium (abrasive stone) and a second coating film release agent. Etc. In addition, when the crushed material is collected after the chemical peeling treatment, a method of polishing the surface of the crushed material with an abrasive while applying or spraying a second coating film release agent on the surface of the crushed material, etc. Can be applied.

  The material of the media is not particularly limited, and examples thereof include natural stone, ceramics fired or sintered (for example, alumina media), metal media such as aluminum and zirconium, and plastic media. Although there is no restriction | limiting in particular as a shape of media, The shape with a corner | angular shape, such as a triangular pyramid and a triangular prism, is preferable. Although there is no restriction | limiting in particular as a magnitude | size of a medium, 2 mm-15 mm are preferable.

  The time for the physical peeling treatment according to the present invention is appropriately set depending on the type of the second coating film release agent and the temperature of the physical peeling treatment, but is 5 to 60 minutes. Is preferable, and 10 to 30 minutes is more preferable. In the present invention, the physical peeling treatment is performed while bringing the second coating film release agent containing the above-described components into contact with the crushed material, and the chemical peeling treatment is performed before the physical peeling treatment. Therefore, the resin coating film and the primer layer can be reliably removed in such a short time. On the other hand, when the physical peeling treatment is performed without using the second coating film peeling agent, or when the chemical peeling treatment is not performed before the physical peeling treatment according to the present invention, such a short film is used. It is difficult to sufficiently remove the resin coating film and the primer layer by physical peeling treatment for a long time.

  Moreover, there is no restriction | limiting in particular as the temperature of the physical peeling process concerning this invention, However, Normal temperature-100 degreeC is preferable and 20-60 degreeC is more preferable. In the present invention, the second coating film release agent containing the above-described components is subjected to a physical peeling treatment while contacting the crushed material. It acts sufficiently, and the resin coating film and primer layer can be reliably removed. That is, in the present invention, it is not necessary to perform a physical peeling process at a temperature exceeding the upper limit, and environmental considerations, workability improvement, and cost reduction can be achieved. On the other hand, when a physical peeling treatment is performed using a conventional coating film peeling agent, it is necessary to perform the physical peeling treatment at a higher temperature in order to fully exhibit the action of the coating film peeling agent. In the present invention, when the temperature of the physical peeling treatment is lower than the lower limit, the second coating film release agent does not sufficiently act, and in the short time physical peeling treatment, the resin coating film and the primer are used. There is a tendency that the layer cannot be removed sufficiently.

<Granulation process>
The granulation step according to the present invention collects the crushed material from which the resin coating film and the primer layer have been removed in the physical peeling step (that is, the pulverized PP resin molded product), and if necessary, washed with water and This is a step of producing PP resin pellets after the drying treatment.

  In this granulation step, the pulverized PP resin molded body is usually pulverized, and the PP resin pulverized product is melted to produce PP resin pellets. Although there is no restriction | limiting in particular as a magnitude | size of the said PP resin ground material, It is preferable to grind | pulverize so that an average particle diameter may be 15 mm or less. If the average particle size of the pulverized PP resin exceeds the upper limit, the PP resin may not be uniformly melted when pelletized. In addition, there is no restriction | limiting in particular as a lower limit of the average particle diameter of the said PP resin ground material, Usually, it is 5 mm or more.

  In the present invention, the PP resin pellet production method and production conditions can be applied without changing (preferably as it is) the method and conditions for producing pellets from a PP resin virgin material. For example, the PP resin pulverized material produced as described above is heated and melted at 180 to 200 ° C. using a melt kneader such as an extruder, and this PP resin melt is extruded from a die to produce a strand. PP resin pellets can be obtained by cutting this using a pelletizer or the like. At this time, if necessary, various additives such as rubber components such as ethylene-propylene copolymer rubber and ethylene-propylene-diene copolymer rubber, fillers, pigments, antioxidants, ultraviolet absorbers, and heat stabilizers. Can be blended.

<Molding process>
The molding step according to the present invention is a step of producing a PP resin molded body from the PP resin pellets produced in the granulation step. In the present invention, the production method and production conditions of the PP resin molded product can be applied without changing (preferably as it is) the known production method and production conditions of the PP resin molded product. For example, the PP resin pellets obtained in the granulation step are dried as necessary, and then heated to 200 to 220 ° C. and molded by various molding methods (for example, extrusion molding, injection molding, foam molding). Thus, a recycled PP resin molded body can be obtained.

  The thus-obtained recycled PP resin molded article has a sufficiently reduced decrease in the physical properties of the PP resin, and in particular has the same Charpy impact strength as a molded article made from a PP resin virgin material. It can be used as an automobile exterior member such as an automobile bumper.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example. Table 1 shows the types of the resin coating film and the primer layer (the types of the painted resin paint and the primer) of the PP resin automotive exterior member used in the examples and comparative examples.

  Further, the coated surface of the crushed material was visually observed, and the degree of peeling between the resin coating film and the primer layer was determined according to the following criteria.

<Peeling degree>
A: The resin coating film and the primer layer did not remain on the painted surface, and the remaining rate was 0%.
B: Although the resin coating film and the primer layer remained very slightly on the painted surface, the remaining rate was less than 5%.
C: The resin coating film and the primer layer remained on the painted surface, and the remaining rate was 5% or more and less than 35%.
D: Resin coating film and primer layer remained on the painted surface, and the remaining rate was 35% or more and less than 50%.
E: The resin coating film and the primer layer remained on the painted surface, and the remaining rate was 50% or more and less than 75%.
F: The resin coating film and the primer layer remained on the painted surface, and the remaining rate was 75% or more and less than 100%.
G: Resin coating film and primer layer remained on the entire painted surface, and the remaining rate was 100%.

Example 1
The automobile exterior members 1 and 2 each having the resin coating film and the primer layer shown in Table 1 were cleaved to prepare crushed materials A-1 to A-2 (length 5 mm × width 5 mm × thickness 3 mm).

  40 parts by mass of butyl cellosolve, 40 parts by mass of benzyl alcohol, 15 parts by mass of an 85% by weight aqueous formic acid solution and 5 parts by mass of a 6 mol adduct of decanol in ethylene oxide were mixed to prepare a first coating film release agent (pH 2 or less). . 200 ml (about 180 g) of the first coating film release agent was weighed into a 400 ml stainless steel container with a lid, and 30 g of each of the crushed materials A-1 to A-2 was added, and then at 20 ° C. for 600 minutes. It left still and the chemical peeling process was performed. Thereafter, each crushed material was taken out, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

  Next, 40 parts by weight of butyl cellosolve, 40 parts by weight of benzyl alcohol, 15 parts by weight of 85% by weight aqueous formic acid solution, 5 parts by weight of 6 mol of ethylene oxide adduct of decanol and 15 parts by weight of water were mixed to remove the second coating film. An agent (pH 2 or lower) was prepared. This second coating film release agent 8L (about 7500g), recovered crushed material about 120ml (about 30g) and ceramic media (triangular prism-like grinding stone, length 15mm) 10L are fluidized barrel polishing machine (Shinto Kogyo Co., Ltd.) The product was put into a polishing tank of model EVF-04), and physical peeling treatment was performed by rotating the polishing tank at 20 ° C. and 300 rpm for 20 minutes. Thereafter, each crushed material was taken out, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

(Examples 2-3)
The chemical peeling treatment was performed in the same manner as in Example 1 except that the temperature of the chemical peeling treatment was changed to 90 ° C. or 120 ° C. and the time was changed to 20 minutes, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. did. Thereafter, physical peeling treatment was performed in the same manner as in Example 1, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Table 2 shows the degree of peeling after the chemical peeling treatment and after the physical peeling treatment.

Example 4
Chemical peeling treatment was performed in the same manner as in Example 2, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Next, the amount of butyl cellosolve was changed to 35 parts by weight, the amount of benzyl alcohol to 35 parts by weight, the amount of 85% by weight aqueous formic acid solution to 5 parts by weight, and the amount of water to 17.5 parts by weight. In the same manner as in Example 2, except that 5 parts by mass of sulfonic acid and 2.5 parts by mass of potassium hydroxide were added and the 6 mol adduct of decanol was not mixed, the second coating film release agent (pH of about 5) was used. ) Was prepared and subjected to physical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Table 2 shows the degree of peeling after the chemical peeling treatment and after the physical peeling treatment.

(Example 5)
Chemical peeling treatment was performed in the same manner as in Example 1, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Thereafter, the physical peeling treatment was performed in the same manner as in Example 1 except that the temperature of the physical peeling treatment was changed to 50 ° C., and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Table 2 shows the degree of peeling after the chemical peeling treatment and after the physical peeling treatment.

(Example 6)
The amount of butyl cellosolve was changed to 35 parts by mass, the amount of benzyl alcohol to 35 parts by mass, the amount of 85% by mass aqueous formic acid solution to 5 parts by mass, 5 parts by mass of toluenesulfonic acid, 2.5 parts by mass of potassium hydroxide And 17.5 parts by mass of water were added, and the first coating remover (pH about 5) was prepared and chemically prepared in the same manner as in Example 4 except that decanol ethylene oxide 6 mol adduct was not mixed. A peeling treatment was performed, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Thereafter, physical peeling treatment was performed in the same manner as in Example 4, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Table 2 shows the degree of peeling after the chemical peeling treatment and after the physical peeling treatment.

(Example 7)
Chemical peeling treatment was performed in the same manner as in Example 2, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Next, a second coating film release agent (pH 2 or less) was prepared in the same manner as in Example 2 except that 15 parts by mass of toluenesulfonic acid was used instead of the 85% by mass formic acid aqueous solution and water was not mixed. A physical peeling treatment was performed, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Table 2 shows the degree of peeling after the chemical peeling treatment and after the physical peeling treatment.

(Example 8)
10 parts by mass of d-limonene instead of benzyl alcohol, 15 parts by mass of toluenesulfonic acid instead of 85% by mass aqueous formic acid, 5 parts by mass of potassium hydroxide and 30 parts by mass of water were added, and ethylene oxide of decanol was added. A first coating film release agent (pH 4) was prepared and chemically stripped in the same manner as in Example 2 except that the 6 mol adduct was not mixed. Judged by. The results are shown in Table 2.

  Next, 10 parts by mass of d-limonene is used instead of benzyl alcohol, the amount of butyl cellosolve is changed to 50 parts by mass, the amount of 85% by mass aqueous formic acid solution is changed to 5 parts by mass, 5 parts by mass of toluenesulfonic acid and water A second coating film release agent (pH 4) was prepared and physical peeling treatment was performed in the same manner as in Example 2 except that 5 parts by mass of potassium oxide was added and the decanol ethylene oxide 6 mol adduct was not mixed. The degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

Example 9
The amount of benzyl alcohol was changed to 30 parts by mass, the amount of 85% by mass aqueous formic acid solution was changed to 10 parts by mass, 5 parts by mass of d-limonene and 15 parts by mass of water were added, and an ethylene oxide 6 mol adduct of decanol was added. A first coating film release agent (pH 2 or less) was prepared in the same manner as in Example 2 except that no mixing was performed, and a chemical peeling treatment was performed, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

  Next, the amount of the 85% by weight aqueous formic acid solution was changed to 5 parts by mass, 5 parts by mass of toluenesulfonic acid and 5 parts by mass of potassium hydroxide were added, and the adduct of decanol with ethylene oxide 6 mol was not mixed. Prepared a second coating film release agent (pH 4) in the same manner as in Example 2 and subjected to physical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

(Example 10)
The amount of butyl cellosolve was changed to 45 parts by mass, 15 parts by mass of water was added, and 85% by mass of formic acid aqueous solution and decanol ethylene oxide 6 mol adduct were not mixed. A coating film release agent (pH 4) was prepared and subjected to chemical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

  Next, the amount of butyl cellosolve was changed to 45 parts by mass, and the second coating film release agent (as in Example 2) except that the 85% by mass aqueous formic acid solution and the 6 mol adduct of decanol were not mixed. A pH 4) was prepared and subjected to physical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 2.

(Comparative Example 1)
A physical peeling treatment was performed in the same manner as in Example 2 except that the chemical peeling treatment was not performed, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

(Comparative Example 2)
A physical peeling treatment was performed in the same manner as in Example 4 except that the chemical peeling treatment was not performed, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

(Comparative Example 3)
The chemical peeling treatment was performed in the same manner as in Example 4 except that 100 parts by mass of tetrahydrofuran was used as the first coating film peeling agent, the temperature of the chemical peeling treatment was changed to 20 ° C., and the time was changed to 600 minutes. The degree of peeling of the film and the primer layer was determined based on the above criteria. Thereafter, physical peeling treatment was performed in the same manner as in Example 4, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. Table 3 shows the degree of peeling after the chemical peeling treatment and after the physical peeling treatment.

(Comparative Example 4)
The amount of benzyl alcohol was changed to 75 parts by weight, the amount of 85% by weight aqueous formic acid solution was changed to 10 parts by weight, 15 parts by weight of water was added, and the ethylene oxide 6 mol adduct of butyl cellosolve and decanol was not mixed. Prepared a first coating film release agent (pH 2 or less) in the same manner as in Example 2 and performed a chemical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

  Next, Example 2 was changed except that the amount of benzyl alcohol was changed to 75 parts by weight, the amount of 85% by weight aqueous formic acid solution was changed to 10 parts by weight, and the ethylene oxide 6 mol adduct of butyl cellosolve and decanol was not mixed. Similarly, a second coating film release agent (pH 2 or less) was prepared and subjected to physical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

(Comparative Example 5)
The first coating was performed in the same manner as in Example 6 except that the amount of butyl cellosolve was changed to 70 parts by mass, the amount of potassium hydroxide to 5 parts by mass, the amount of water to 15 parts by mass, and benzyl alcohol was not mixed. A film peeling agent (pH 4) was prepared and subjected to chemical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

  Next, the same procedure as in Example 6 was conducted except that the amount of butyl cellosolve was changed to 70 parts by mass, the amount of potassium hydroxide to 5 parts by mass, the amount of water to 15 parts by mass, and benzyl alcohol was not mixed. A second coating film release agent (pH 4) was prepared and subjected to physical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

(Comparative Example 6)
The amount of butyl cellosolve was changed to 70 parts by weight, 30 parts by weight of water was added, and benzyl alcohol, 85% by weight aqueous formic acid solution and 6 mol of ethylene oxide adduct of decanol were not mixed. A first coating film release agent (pH about 6) was prepared and subjected to chemical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

  Next, Examples were changed except that the amount of butyl cellosolve was changed to 70 parts by mass, the amount of water was changed to 30 parts by mass, and benzyl alcohol, 85% by mass formic acid aqueous solution and decanol ethylene oxide 6 mol adduct were not mixed. As in 2, a second coating film release agent (pH about 6) was prepared and subjected to physical peeling treatment, and the degree of peeling of the resin coating film and the primer layer was determined based on the above criteria. The results are shown in Table 3.

  As is apparent from the results shown in Tables 2 and 3, at the stage where the chemical peeling treatment was performed using the first coating remover containing at least one of d-limonene and benzyl alcohol and butyl cellosolve. Although the resin coating film could not be sufficiently peeled, by performing a physical peeling treatment in a second film peeling agent containing at least one of d-limonene and benzyl alcohol and butyl cellosolve, It was confirmed that both the aqueous resin coating film and the solvent-based resin coating film were sufficiently peeled off (Examples 1 to 10). In particular, when Examples 1 to 3 and 5 are compared with Comparative Example 1, Examples 4 and 6 and Comparative Example 2, the chemical peeling treatment according to the present invention is performed before the physical peeling treatment according to the present invention is performed. It was confirmed that the peelability of the resin coating was improved.

  In the first and second coating film release agents according to the present invention, when at least one of formic acid and toluenesulfonic acid is further included (Examples 2, 4, 6, 8, 9). It was found that the peelability of the resin coating was improved as compared with the case where no formic acid and toluenesulfonic acid were contained (Example 10). Moreover, in the 2nd coating film peeling agent, when water is contained (Examples 2 and 4), the peelability of the resin coating film is higher than when water is not contained (Example 7). It turns out that it improves. Furthermore, when Examples 2-3, 5 and Example 1 are compared with each other, it is understood that the release property of the resin coating in a short time is improved by performing the chemical release treatment or the physical release treatment at a high temperature. It was.

  On the other hand, when the chemical peeling treatment is performed using tetrahydrofuran before performing the physical peeling treatment according to the present invention (Comparative Example 3), the chemical peeling treatment is performed using the coating film peeling agent according to the present invention. It was confirmed that the releasability of the resin coating film was inferior compared to the case of applying (Examples 4 and 6). Moreover, when the coating film peeling agent which does not contain butyl cellosolve is used as the first and second coating film peeling agents (Comparative Example 4), the coating film peeling agent according to the present invention is used (Example 2). ) Was found to be inferior in the peelability of the resin coating film. Furthermore, when the coating film peeling agent which does not contain d-limonene and benzyl alcohol is used as the first and second coating film peeling agents (Comparative Examples 5 to 6), the coating film peeling agent according to the present invention is used. It turned out that the peelability of a resin coating film is inferior compared with the case (Examples 6 and 10) used.

<Physical property evaluation of recycled PP resin molding>
The crushed material from which the coating film was removed in the examples was washed with water and then granulated to produce PP resin pellets. The PP resin pellets were dried at 100 ° C. for 3 hours. The melt flow rate of the dried PP resin pellets was measured by the following method. In addition, using the dried PP resin pellets, injection molding was performed at a molten resin temperature of 200 ° C. and a mold temperature of 40 ° C., and type A multipurpose test pieces were produced in accordance with ISO 3167. The parallel part of this multi-purpose test piece is cut out to produce a bar-type test piece (length 80 mm × width 10 mm × thickness 4 mm), and the physical properties of the recycled PP resin molded product are measured by the following method using the bar-type test piece. It was measured.

(Melt flow rate)
In accordance with the method described in ISO 1133, the melt flow rate of the recycled PP resin was measured under the conditions of load: 21.18 N and test temperature: 230 ° C.

(Tensile modulus)
In accordance with the method described in ISO 527-1, 2, a tensile test was performed under the conditions of a tensile speed: 50 mm / min, a distance between chucks: 115 mm, and a test environment: 23 ± 2 ° C. The elastic modulus was determined.

(Charpy impact strength)
A notch of type A having a radius of 0.25 mm was processed on the bar-type test piece so that the remaining width was 8.0 mm to prepare a notched test piece. Using this notched test piece, the Charpy impact strength of the recycled PP resin molding was measured at a test temperature of −30 ° C. or 23 ° C. by an edgewise test method in accordance with ISO 179-1,2.

(Brittle temperature)
The embrittlement temperature of the recycled PP resin molded product was measured according to ASTM D746-98.

(Load deflection temperature)
The deflection temperature of the recycled PP resin molded body at a bending stress of 1.8 MPa or 0.45 MPa was measured by the flatwise method in accordance with ISO 75-1 to 3-1.

(Rockwell hardness)
Based on the method described in ISO 2039-2, the Rockwell hardness of the recycled PP resin molding was measured.

  Table 4 shows various physical property values of the recycled PP resin recovered by removing the coating film from the crushed product A-1 and the molded product thereof in Example 6, Example 8, and Comparative Example 4. Table 4 also shows various physical property values of the recycled PP resin molded body (unpeeled recycled product) produced from the crushed material A-1 from which the PP resin virgin material or resin coating film was not removed.

  As is clear from the results shown in Table 4, the recycled PP resin obtained from the crushed material (Examples 6 and 8) from which the coating film was removed by the method according to the present invention (Examples 6 and 8) and the physical properties of the molded product were PP resin virgin material. And comparable to that molded body. On the other hand, when the coating film was removed using a coating film release agent not containing butyl cellosolve (Comparative Example 4) and in the case of an unpeeled recycled product, the Charpy impact strength at 23 ° C. was low and the embrittlement temperature was high. became.

  As described above, according to the present invention, the resin coating film on the surface of the polypropylene resin molding can be surely removed without deteriorating the physical properties of the obtained polypropylene resin molding, and the polypropylene resin automobile can be removed. It is possible to reliably regenerate the exterior member for use. Moreover, even when a polypropylene resin automotive exterior member painted with a solvent-based paint and a polypropylene resin automotive exterior member painted with a water-based paint are mixed, they can be reproduced without separation. Is possible.

  Therefore, the method for producing a recycled polypropylene resin molded product of the present invention is such that the physical properties of the obtained polypropylene resin molded product satisfy the physical properties required for automotive exterior members such as automotive bumpers. This is useful as a method for reusing a polypropylene resin automotive exterior member such as an automotive bumper.

Claims (6)

A crushed product of an automotive exterior member comprising a polypropylene resin molded body and a resin coating film is contacted with at least one of d-limonene and benzyl alcohol and a first coating film release agent containing butyl cellosolve. Obtaining a crushed material in which a part of the resin coating film remains,
The crushed material in which a part of the resin coating film remains and the crushed material are physically contacted with at least one of d-limonene and benzyl alcohol and a second coating film release agent containing butyl cellosolve. Removing the remaining resin coating film from the crushed material,
Recovering the crushed material from which the resin coating has been removed to produce polypropylene resin pellets;
Producing a polypropylene resin molded article using the polypropylene resin pellets;
The manufacturing method of the reproduction | regeneration polypropylene-type resin molded object characterized by including.   The method for producing a recycled polypropylene resin molded article according to claim 1, wherein the second coating film release agent further contains water.   3. At least one of the first coating film release agent and the second coating film release agent further contains at least one of formic acid and toluenesulfonic acid. The manufacturing method of the reproduction | regeneration polypropylene-type resin molding as described in 4.   At least one of a 1st coating film peeling agent and a 2nd coating film peeling agent further contains a nonionic surfactant, Any one of Claims 1-3 characterized by the above-mentioned. The manufacturing method of the reproduction | regeneration polypropylene-type resin molding as described in claim | item.   The method for producing a recycled polypropylene resin molded body according to any one of claims 1 to 4, wherein the recycled polypropylene resin molded body is an automotive exterior member. The automobile exterior member further includes a primer layer between the resin coating film and the polypropylene resin molded body,
The method for producing a recycled polypropylene resin molded article according to any one of claims 1 to 5, wherein the primer layer is removed together with the resin coating film from the crushed material.