KR20220055752A - Method for manufacturing vehicle interior material - Google Patents

Abstract

The present invention relates to a method for manufacturing an interior material for a vehicle, in which a process is simplified, and formability is excellent. The method for manufacturing the interior material for the vehicle includes: a pre-preg preparation step of preparing a pre-preg by impregnating a resin composition with a carbon fiber; a release film attachment step of attaching a release film to one surface of the pre-preg; a pre-preg insertion step of inserting the pre-preg to which the release film is attached into a mold; and a molding layer formation step of forming a molding layer by closing the mold and injecting a resin. According to the method, since the carbon fiber is used, the process is simplified, and the formability is excellent, so that a production time and a production cost are reduced, and marketability is excellent.

Description

Method for manufacturing interior materials for vehicles

The present invention relates to a method for manufacturing an interior material for a vehicle, and more particularly, to a method for manufacturing an interior material for a vehicle excellent in moldability while simplifying the process.

In general, as interior materials of automobiles, resin molded parts are used for center fascia, instrument panel finishing materials, door garnish, and console box parts, and resin molded products are widely used as surface finishing materials for home appliances.

In particular, various control and convenience devices are installed on the dashboard and audio deck, gear shifting part, airbag, door lock and window opening and closing parts installed around the driver's and passenger's seats inside the vehicle, and various control devices and convenience In the gap between the exterior of the device and the interior material, an interior material finishing panel is installed to finish the interior material, and such interior material is becoming an important factor in determining the emotional quality of the interior of the vehicle.

As such, since the interior materials for automobiles have a significant effect on the aesthetics of the interior of the automobile, the aesthetic demands on the exterior are gradually increasing in the flow of luxury and individualization of automobiles.

Accordingly, in recent years, there is an increasing demand for interior materials for automobiles to which carbon materials are applied in order to obtain a refined appearance and a high-quality texture.

Korea Patent Publication No. 2018-0088060 (2018.08.03)

The present invention was devised to solve the above problems, and it is an object of the present invention to provide a method for manufacturing an interior material for a vehicle excellent in moldability while simplifying the process while using carbon fiber.

In order to achieve the above object, a method for manufacturing an interior material for a vehicle according to a preferred embodiment of the present invention includes: a prepreg manufacturing step of impregnating carbon fiber in a resin composition to produce a prepreg; A release film attachment step of attaching a release film to one surface of the prepreg; a prepreg inserting step of inserting the prepreg to which the release film is attached to a mold; and a molding layer forming step of forming a molding layer by injecting a resin after molding the mold.

Here, the prepreg manufacturing step, a carbon fiber preparation step of preparing the woven or braided carbon fiber; an impregnation step of impregnating the carbon fiber into a thermoplastic resin; Compression step of pressing the carbon fiber sheet impregnated with a thermoplastic resin; and a drying step of drying the compressed carbon fiber sheet.

And, in the drying step, the compressed carbon fiber sheet may be put into a heated flat plate press and dried at a temperature of 130 to 160° C. for 2 to 4 minutes.

The thermoplastic resin is polymethyl methacrylate (PMMA), polypropylene (PP), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS) , polyvinyl chloride (PVC), polyamide (PA), polycarbonate-acrylonitrile butadiene styrene (PC-ABS), polyurethane (PU) and polybutylene terephthalate (PBT) at least any one or more from the group consisting of can be used that consists of

In addition, the release film attachment step may be made by applying a silicone-based adhesive or an acrylic adhesive to one surface of the base film, and attaching a release film having an adhesive strength of 1,000 to 1,300 gf/in.

The prepreg inserting step may include inserting the release film so that the release film is in close contact with the mold and the resin is injected into the prepreg.

And, the method for manufacturing an interior material for a vehicle according to an embodiment of the present invention includes a release film removing step of separating and removing the release film from the prepreg on which the molding layer is formed; and a coating layer forming step of forming a coating layer covering the prepreg to protect the prepreg.

Here, in the coating layer forming step, a coating layer may be formed by attaching a film-type resin to the prepreg, or a liquid resin may be applied to the prepreg to form a coating layer.

According to the method for manufacturing an interior material for a vehicle according to the present invention, the process is simplified while using carbon fiber, and the moldability is excellent, so that the production time and cost can be reduced, and the effect of excellent marketability can be obtained.

1 is a flowchart schematically illustrating a method for manufacturing an interior material for a vehicle according to an embodiment of the present invention;
2 is a flowchart schematically illustrating a prepreg manufacturing step in a method for manufacturing an interior material for a vehicle according to an embodiment of the present invention.

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

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be construed to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, terms such as first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The above terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

The term “and/or” may include a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but other components may exist in between. can be understood On the other hand, when an element is referred to as being “directly connected” or “directly connected” to another element, it may be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression may include the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and one or more other features It may be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary may be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, it is interpreted in an ideal or excessively formal meaning. it may not be

In addition, the following embodiments are provided to more completely explain to those with average knowledge in the art, and the shapes and sizes of elements in the drawings may be exaggerated for more clear explanation.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a flowchart schematically illustrating a method for manufacturing an interior material for a vehicle according to an embodiment of the present invention, and FIG. 2 is a flowchart schematically illustrating a prepreg manufacturing step in the method for manufacturing an interior material for a vehicle.

1 and 2, the method for manufacturing an interior material for a vehicle according to an embodiment of the present invention includes a prepreg manufacturing step 110 of manufacturing a prepreg by impregnating carbon fiber in a resin composition, and the prepreg A release film attachment step (S120) of attaching a release film to one surface of A shaping layer forming step (S140) of forming a shaping layer may be included.

And, the method for manufacturing an interior material for a vehicle according to an embodiment of the present invention includes a release film removing step (S150) of separating and removing the release film from the prepreg on which the molding layer is formed, and the prepreg to protect the prepreg It may be made to further include a coating layer forming step (S160) of forming a coating layer covering the.

The prepreg manufacturing step 110 is a step of manufacturing a prepreg as a single sheet by impregnating carbon fibers in a resin composition.

More specifically, the prepreg manufacturing step 110 includes a carbon fiber preparation step (S111) of preparing the woven or braided carbon fiber, an impregnation step of impregnating the carbon fiber into a thermoplastic resin (S112), and a thermoplastic resin It may include a pressing step (S113) of pressing the impregnated carbon fiber, and a drying step (S114) of drying the compressed carbon fiber.

The carbon fiber preparation step (S111) is a step of preparing carbon fibers by weaving or braiding carbon fiber yarns. Since the step of preparing the carbon fiber is a known technique, a detailed description thereof will be omitted.

The impregnation step (S112) is a step of impregnating the carbon fiber into the thermoplastic resin.

For example, the impregnation step (S112) may be manufactured by impregnating the carbon fiber in an impregnation solution prepared by mixing a thermoplastic resin with an aqueous solvent.

Here, the aqueous solvent is water or water and alcohols such as methanol, ethanol, isopropyl alcohol, butanol, ketones such as acetone and methyl ethyl ketone, ethylene glycol, diethylene glycol, glycols such as propylene glycol, etc. Soluble in water It indicates that the phosphorus organic solvent is mixed in an arbitrary ratio. It is because rapid evaporation of the solvent in a drying process can be suppressed by using an aqueous solvent, a uniform resin layer can be formed, and it is excellent in the point of environmental load.

And, the thermoplastic resin is polymethyl methacrylate (PMMA), polypropylene (PP), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polyethylene (PE), polyethylene terephthalate (PET), polystyrene ( PS), polyvinyl chloride (PVC), polyamide (PA), polycarbonate-acrylonitrile butadiene styrene (PC-ABS), polyurethane (PU), and at least any one of the group consisting of polybutylene terephthalate (PBT) It may consist of more than one.

When the impregnating liquid is prepared in this way, the concentration of the impregnating liquid may be 40 to 60% by weight, preferably 45 to 55% by weight. If the concentration of the impregnation solution is less than 40 wt%, it may be difficult to impregnate the thermoplastic resin through the gaps of the carbon fibers, and if the concentration of the impregnation solution exceeds 60 wt%, it may be difficult to form and maintain the appearance. The impregnating liquid is preferably maintained at a temperature of 60 to 90 ℃, if the carbon fiber is impregnated while maintaining the temperature, the thermoplastic resin can be evenly dispersed and adhered to the carbon fiber.

Of course, the method for impregnating the carbon fiber with the thermoplastic resin is not limited thereto, and various known methods may be applied.

The pressing step (S113) is a step of pressing the carbon fiber sheet impregnated with the thermoplastic resin on the carbon fiber. For example, in the pressing step (S113), the carbon fiber sheet impregnated with the thermoplastic resin may be compressed through roll pressing.

The drying step (S114) is a step of drying the compressed carbon fiber sheet.

For example, in the drying step (S114), the compressed carbon fiber sheet is put into a heated flat press and dried at a temperature of 130 to 160° C. for 2 to 4 minutes.

The release film attaching step (S120) is a step of attaching the release film to one side of the prepreg, which is a carbon fiber sheet produced through the prepreg manufacturing step (S110) as described above.

Here, the release film may be prepared by applying a silicone-based adhesive or an acrylic adhesive to one surface of the base film, and having an adhesive strength of 1,000 to 1,300 gf/in.

Here, when the adhesive force of the release film is formed to be less than 1,000 gf/in, in the process of inserting the prepreg to which the release film is attached to the mold, the release film is easily separated from the prepreg and serves as a protective layer. There is a problem that cannot be done. And, when the adhesive force of the release film is formed in excess of 1,300 gf/in, when the release film is separated from the prepreg after forming the molding layer, the release film is not well separated, so that the surface of the prepreg is damaged or the adhesive remains. there is

Therefore, in the present invention, a release film having an adhesive strength of 1,000 to 1,300 gf/in was used.

Here, as the base layer of the release film, a general-purpose resin film such as PE, PP, CPP (casting polypropylene) TPU, EVA, PES, or PA may be used. Preferably, a PET film may be used as the base layer.

In addition, the thickness of the release film is preferably provided to be 0.1 mm or more and 0.5 mm or less in consideration of economic feasibility and moldability in the mold of the prepreg later.

Further, the release film is separated and removed from the prepreg in the release film removing step (S150). In this case, a release agent may be applied to the release film or the prepreg so as to be easily peeled off the prepreg. Here, the release agent may be a silicone-based resin, an acrylic resin, or a fluorine-based resin.

The prepreg inserting step (S130) is a step of inserting the prepreg to which the release film is attached to a mold. At this time, the release film is in close contact with the mold, and the resin is inserted onto the prepreg to be injected.

Here, the mold has a cavity, which is the mold surface corresponding to the shape of the molding layer, and a plurality of suction holes connecting the cavity and the vacuum pump to suck air from the cavity and adsorb the release film to the cavity. can do. That is, when the prepreg to which the release film is attached is inserted into the mold, the part of the release film is brought into close contact with the mold, and the vacuum pump is operated, air from the cavity and the space formed by the release film is sucked and discharged. The release film may be in close contact with the cavity.

The molding layer forming step (S140) is a step of forming a molding layer by molding the mold and then injecting a molten resin onto the prepreg and cooling it.

The coating layer forming step ( S160 ) is a step of forming a coating layer covering the prepreg in order to protect the prepreg. That is, the coating layer forming step (S160) is a step of forming a coating layer that is a protective layer that covers the surface of the carbon fiber in order to protect the carbon fiber exposed to the outside.

For example, in the coating layer forming step ( S160 ), a coating layer may be formed by attaching a film-type resin to the prepreg, or a coating layer may be formed by applying a liquid resin to the prepreg.

In this case, if the resin material is provided in the form of a film to form the coating layer, the coating layer can be attached to the prepreg by an adhesive or thermocompression method. A coating layer may be applied.

Alternatively, in the coating layer forming step (S160), the coating layer is formed on the prepreg by insert injection molding after disposing the molding layer inside the mold, or the coating layer is formed by applying a liquid resin to the prepreg. .

Here, the coating layer may be made of a thermoplastic or thermosetting resin such as PC (polycarbonate) resin, PU (polyurethane) resin, epoxy resin, ABS resin, polypropylene resin, PP (polypropylene) resin, PA (polyacetal) resin, and the like.

For example, the coating layer may be laminated by applying an organic-inorganic hybrid compound to the prepreg.

The coating layer may be made of an organic-inorganic hybrid compound prepared by chemically bonding silica (Si) to an epoxy resin.

Here, when the content of silica increases, the hardness increases but flexibility decreases, and when the content of the epoxy resin increases, the flexibility increases but the hardness decreases. .

Here, the organic-inorganic hybrid compound may be formed by chemically bonding an epoxy resin and silica rather than simply mixing them.

A simple mixture of an epoxy resin and silica has the advantage of being easily prepared, but has disadvantages in that the transmittance is poor, the surface hardness is low, and the light resistance, weather resistance and chemical resistance are not good.

In comparison, if the epoxy resin and silica are chemically combined, it is difficult to manufacture, but transmittance can be secured at 89% or more, hardness and flexibility are excellent, light resistance, weather resistance and chemical resistance are excellent, and diffuse reflection And there is an advantage that refraction does not occur.

As described above, according to the method for manufacturing an interior material for a vehicle according to an embodiment of the present invention, since a single carbon fiber sheet manufactured by impregnating carbon fiber with a thermoplastic resin is used, it is possible to reduce manufacturing cost and improve moldability during insert injection molding.

In addition, since the release film is attached to the carbon fiber sheet and then inserted, the release film is reinforced to prevent bending and deformation during inserting, thereby preventing the carbon fiber from being damaged.

In addition, it is possible to form a molding layer through injection after inserting a prepreg with a release film into the mold without preforming the prepreg separately, thereby simplifying the process, reducing production time and cost, and improving productivity can do it

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto. It is clear that the transformation or improvement is possible by the person.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

Claims (8)

A prepreg manufacturing step of manufacturing a prepreg by impregnating carbon fibers in a resin composition;
A release film attachment step of attaching a release film to one surface of the prepreg;
a prepreg inserting step of inserting the prepreg to which the release film is attached to a mold; and
a molding layer forming step of forming a molding layer by molding the mold and then injecting a resin;
A method of manufacturing an interior material for a vehicle comprising a.
The method of claim 1,
The prepreg manufacturing step is,
Carbon fiber preparation step of preparing the woven or braided carbon fiber;
an impregnation step of impregnating the carbon fiber into a thermoplastic resin;
Compression step of pressing the carbon fiber sheet impregnated with a thermoplastic resin; and
a drying step of drying the compressed carbon fiber sheet;
A method of manufacturing an interior material for a vehicle, comprising:
3. The method of claim 2,
The drying step is
A method for manufacturing an interior material for a vehicle, characterized in that the compressed carbon fiber sheet is put into a heated flat plate press and dried at a temperature of 130 to 160° C. for 2 to 4 minutes.
3. The method of claim 2,
The thermoplastic resin is
Polymethyl methacrylate (PMMA), polypropylene (PP), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), polyamide (PA), polycarbonate-acrylonitrile butadiene styrene (PC-ABS), polyurethane (PU) and polybutylene terephthalate (PBT) A method for manufacturing interior materials for vehicles.
The method of claim 1,
The release film attaching step,
A method for manufacturing an interior material for a vehicle, characterized in that a silicone-based adhesive or an acrylic adhesive is applied to one side of the base film and manufactured, and a release film having an adhesive strength of 1,000 to 1,300 gf/in is attached.
The method of claim 1,
The prepreg insert step is,
The method for manufacturing an interior material for a vehicle, characterized in that the release film is inserted into close contact with the mold, and the resin is injected into the prepreg.
The method of claim 1,
a release film removal step of separating and removing the release film from the prepreg on which the molding layer is formed; and
a coating layer forming step of forming a coating layer covering the prepreg to protect the prepreg;
Method for manufacturing an interior material for a vehicle, characterized in that it further comprises.
8. The method of claim 7,
The coating layer forming step,
A method of manufacturing an interior material for a vehicle, characterized in that a coating layer is formed by attaching a film-type resin to the prepreg, or a coating layer is formed by applying a liquid resin to the prepreg.

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