JP2001239590A - Surface treatment method for thermoplastic resin and method of adhering interior material for automobile using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop inexpensive, simple and safe methods for surface treatment and adhesion so as to improve the strength of adhesion of thermoplastic resin to a urethane adhesive on the occasion when an interior material of an automobile or the like, constituted of the thermoplastic resin is adhered to an adherend by using the urethane adhesive. SOLUTION: A surfactant is applied beforehand to the surface to be adhered of the thermoplastic resin when the resin is adhered to the adherend by using the urethane adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method for a thermoplastic resin which exhibits good adhesiveness when the thermoplastic resin is bonded to an object using a urethane-based adhesive. The present invention relates to a method of bonding an automobile interior material which can obtain good adhesiveness when an automobile interior material made of a thermoplastic resin is bonded with a urethane-based adhesive.

[0002]

2. Description of the Related Art Urethane-based adhesives have good adhesiveness to various adherends such as plywood, wood, metal, etc., can be cured with one-part at room temperature, and can easily produce adhesives of various structures. It is used in a wide range of applications, such as building materials, automobiles, food packaging, etc., for the reason that it can be used. Particularly in the automobile-related field, it is used as an adhesive for direct glazing, an adhesive for interior parts, and an adhesive for plastic structures, which are used when bonding window glass directly to the body flange using an adhesive, most of which are moisture-cured It is a one-part urethane type adhesive.

[0003] When an automotive interior material made of a thermoplastic resin is bonded using a urethane-based adhesive, the adhesive strength between the thermoplastic resin and the urethane-based adhesive is weak. Bonding is performed after the surface is subjected to a primer treatment. The method of applying a primer to the surface of the adhesive surface of an automobile interior material includes a method of imparting polarity to the surface by corona discharge, a method of applying a urethane paint, a method of applying a liquid curable polyurethane prepolymer containing a polyol, an isocyanate, and a catalyst. Examples include a method of impregnation, a method of applying an organic solvent solution containing an isocyanate compound as a main component, and the like, but in these primer treatment methods, it takes time to cure and dry the primer layer, and a large amount of an organic solvent is used. Air pollution, occupational health problems, increase costs,
There were problems such as an increase in the number of steps and complexity.

On the other hand, from the trend of energy saving in recent years, the weight of automobiles has been reduced in order to suppress the consumption of gasoline, and thinning of a metal top plate at the ceiling of the automobile has been studied. However, when the metal top plate is thinned, a measure for maintaining structural rigidity is required. Therefore,
In order to supplement the rigidity of the thinned metal top plate with the automotive ceiling material and urethane adhesive, the space between the metal top plate and the vehicle ceiling material that existed in the conventional method of mounting the vehicle ceiling material was eliminated, and the metal top plate was removed. And a method of attaching an automobile ceiling material with a urethane-based adhesive layer (adhesive molded ceiling) has been proposed. Since the metal ceiling plate and the car ceiling material are bonded via the urethane-based adhesive layer in the adhesive molded ceiling, stable adhesiveness that does not fall off even during long-term use or use in harsh environments is required. Have been.

However, at present, the adhesiveness between the automotive ceiling material made of a thermoplastic resin and the urethane-based adhesive cannot be said to be sufficient from the viewpoint of stability, and when the automotive ceiling material is attached to the top plate of the vehicle via the urethane-based adhesive. There is a demand for the development of automotive ceiling materials that have stable adhesion to urethane-based adhesives that do not fall off even when used for a long period of time or under severe environments.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a surface treatment method for a thermoplastic resin capable of exhibiting good adhesiveness when the thermoplastic resin is bonded to an adherend using a urethane-based adhesive. More specifically, when bonding a car body and a car interior material made of a thermoplastic resin with a urethane-based adhesive,
The present invention relates to a method for bonding an automobile interior material which is excellent in simplicity and safety as compared with a conventional primer treatment method, and can obtain good adhesiveness at low cost.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, when the thermoplastic resin is bonded using a urethane-based adhesive, the surface of the bonding surface of the thermoplastic resin is previously determined. By applying a surfactant to the surface, the polar groups of the surfactant appearing on the adhesive surface of the thermoplastic resin, hydrogen bonding between the surface adsorbed water and the urethane group in the urethane-based adhesive, van der Waals It has been found that an intermolecular force such as a force is developed, and as a result, the adhesiveness between the urethane-based adhesive and the thermoplastic resin is improved. Further, among the above surfactants, cationic surfactants, particularly, when an amine compound used as a catalyst for adjusting the curing rate of the urethane-based adhesive is used, a urethane-based adhesive and a thermoplastic resin are used. It was found that the adhesiveness of the present invention was greatly improved, and the present invention was completed. That is, the present invention is characterized in that (1) when a thermoplastic resin is bonded to an object to be bonded using a urethane-based adhesive, a surfactant is previously applied to the surface of the bonding surface of the thermoplastic resin. Surface treatment method for thermoplastic resin. (2) The thermoplastic resin surface treatment method according to (1), wherein the thermoplastic resin is a resin selected from a polystyrene resin, a polyester resin, and a polyphenylene ether resin. (3) The surface treatment method for a thermoplastic resin according to (1) or (2), wherein the urethane-based adhesive is a one-component moisture-curable urethane-based adhesive. (4) The surface treatment method for a thermoplastic resin according to any one of (1) to (3), wherein the surfactant is a cationic surfactant. (5) The cationic surfactant is an aliphatic amine salt, aliphatic 4
(1) to (4), which are amine compounds such as quaternary ammonium salts and aromatic quaternary ammonium salts.
The surface treatment method for a thermoplastic resin according to 1 above. (6) The surfactant adhesion concentration on the bonding surface of the thermoplastic resin is 0.01 g / m ² or more (1).
The surface treatment method for a thermoplastic resin according to any one of (1) to (5). (7) The surface treatment described in (1) to (6) was previously performed on the bonding surface of the vehicle interior material when the vehicle body and the vehicle interior material made of a thermoplastic resin were bonded with a urethane-based adhesive. Thereafter, a method of bonding an automobile interior material, comprising applying a urethane-based adhesive and pressing the coating. (8) The method for bonding an automobile interior material according to (7), wherein the adhesion surface of the automobile interior material is a film made of a resin selected from a polystyrene resin, a polyester resin, and a polyphenylene ether resin. (9) The adhesive surface of the automobile interior material is a spunbond sheet made of a polyester resin (7).
The method for bonding automobile interior materials according to the above.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a surface treatment method for a thermoplastic resin of the present invention for improving adhesiveness with a urethane-based adhesive will be described.

As the thermoplastic resin used in the present invention, any resin known to those skilled in the art can be used. For example, a resin used as a member for an automobile interior material may be used. Among them, as a resin having heat resistance required as a member for an automobile interior material, for example, a heat-resistant polystyrene resin such as a styrene-acrylic acid copolymer, a styrene-maleic anhydride copolymer, and a styrene-itaconic acid copolymer ( Heat-resistant PS resin); polystyrene or heat-resistant polystyrene and polyphenylene ether (PPE)
A modified polyphenylene ether-based resin (modified PPE-based resin) such as a blend with styrene, a styrene-phenylene ether copolymer such as a styrene graft polymer on PPE;
Polycarbonate resins; and polyester resins exemplified by polybutylene terephthalate and polyethylene terephthalate. Two or more of these resins can be used.

Among them, modified PPE resin, heat-resistant PS
The system-based resin and the polyester-based resin are preferable because they are excellent in quality such as heat resistance and rigidity and are easy to process.

As the PPE used for the modified PPE resin, for example, poly (2,6-dimethylphenylene-1,
4-ether), poly (2-methyl-6-ethylphenylene-4-ether), poly (2,6-diethylphenylene-1,4-ether), poly (2,6-diethylphenylene-1,4-ether) Ether), poly (2-methyl-6)
-N-propylphenylene-1,4-ether), poly (2-methyl-6-n-butylphenylene-1,4-ether), poly (2-methyl-6-chlorophenylene-
1,4-ether), poly (2-methyl-6-bromophenylene-1,4-ether), poly (2-ethyl-6)
-Chlorophenylene-1,4-ether) and the like, and these are used alone or in combination of two or more.

Among the modified PPE resins, a polystyrene resin (PS resin) forming a mixed resin with the PPE resin is styrene or a derivative thereof, for example, α-methylstyrene.
It is a resin mainly composed of 2,4-dimethylstyrene, monochlorostyrene, dichlorostyrene, p-methylstyrene, ethylstyrene and the like. Therefore, the PS-based resin is not limited to a homopolymer composed of only styrene or a styrene derivative, and may be a copolymer produced by copolymerizing with another monomer.

Specific examples of the styrene monomer to be polymerized, preferably graft-polymerized, to the PPE resin include, for example, styrene, α-methylstyrene, 2,4-
Examples include dimethylstyrene, monochlorostyrene, dichlorostyrene, p-methylstyrene, ethylstyrene and the like. These may be used alone or in combination of two or more. Of these, styrene is versatile,
It is preferable in terms of cost.

The heat-resistant PS resin is a copolymer of styrene or a derivative thereof and another monomer, has an effect of improving heat resistance, and is a monomer copolymerizable with styrene or a derivative thereof. Examples thereof include unsaturated carboxylic acids such as maleic acid, fumaric acid, acrylic acid, methacrylic acid, and itaconic acid or derivatives thereof and acid anhydrides thereof, and nitrile compounds such as acrylonitrile and methacrylonitrile or derivatives thereof. These may be used alone or in combination of two or more. Also, when polymerizing styrene or a styrene derivative,
Synthetic rubber or rubber latex added and polymerized with unsaturated carboxylic acids such as maleic acid, fumaric acid, acrylic acid, methacrylic acid, itaconic acid or its derivatives and their acid anhydrides, acrylonitrile, methacrylonitrile, etc. It may be a copolymer with a nitrile compound. Among them, styrene-maleic anhydride copolymer, styrene-acrylic acid copolymer, styrene-
Methacrylic acid-based copolymers and acrylonitrile-butadiene-styrene copolymers are preferred in view of the heat resistance improving effect, versatility, and cost.

The heat-resistant PS resins may be used alone or in combination of two or more. In addition, heat-resistant PS
The system resin may be used by blending it with another thermoplastic resin. Examples of the blended thermoplastic resin include polystyrene, high impact polystyrene (HIPS), polycarbonate, polyester, polyamide, and copolymers thereof. . Among them, HIPS is preferred from the viewpoints of versatility, uniform dispersion, high effect of improving impact resistance, cost, and the like. Known HIPS can be used, and the content of the rubber component is usually 1 to 15% by weight.

As the polyester resin, a thermoplastic polyester obtained by polycondensation of a divalent or higher aromatic carboxylic acid component and a divalent or higher alcohol component by a known method is used. Specific examples of the thermoplastic polyester resin include, for example, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexane dimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate.

As the divalent or higher aromatic carboxylic acid component, an aromatic carboxylic acid having 8 to 22 carbon atoms and an ester-forming derivative thereof are used. Specific examples of these include phthalic acid such as terephthalic acid and isophthalic acid,
Naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methane, anthracenedicarboxylic acid, 4-4′-diphenyldicarboxylic acid, 1,2-bis (phenoxy) ethane-4,4-dicarboxylic acid, diphenylsulfonedicarboxylic acid, trimesic acid And carboxylic acids such as trimellitic acid and pyromellitic acid, and derivatives thereof having ester-forming ability. These may be used alone or in combination of two or more. Of these, terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid are preferred from the viewpoint of ease of handling, ease of reaction, and physical properties of the obtained resin.

The divalent or higher valent alcohol component includes an aliphatic compound having 2 to 15 carbon atoms, an alicyclic compound having 6 to 20 carbon atoms, and an aromatic compound having 6 to 40 carbon atoms. The above-mentioned compounds having a hydroxyl group, and their ester-forming derivatives are exemplified. Specific examples of such alcohol components include ethylene glycol,
Propylene glycol, butanediol, hexanediol, decanediol, neopentyl glycol, cyclohexanedimethanol, cyclohexanediol,
2,2′-bis (4-hydroxyphenyl) propane,
Compounds such as 2,2'-bis (4-hydroxycyclohexyl) propane, hydroquinone, glycerin, and pentaerythritol, and derivatives thereof having an ester-forming ability can be given. Among them, ethylene glycol, butanediol, and cyclohexane dimethanol are preferred in terms of ease of handling, ease of reaction, and physical properties of the obtained resin.

The thermoplastic resin in the present invention includes a single layer of the above-described thermoplastic resin or a plurality of layers of the same or different thermoplastic resins. As a matter of course, a plurality of layers made of a different type of thermoplastic resin of a foam and a non-foam as exemplified in the present invention are also included.

The surfactant used in the present invention includes:
So-called amphiphilic substances having a hydrophilic atom group and a lipophilic atom group are mentioned, for example, carboxylic acid salts such as fatty acid soaps, N-acyl amino acid salts, alkyl ether carboxylates, acylated peptides, and alkyl sulfonates , Alkyl benzene sulfonate, alkyl naphthalene sulfonate, sulfosuccinate, α-olefin sulfonate,
Sulfonates such as N-acyl sulfonates, sulfated oils,
Illustrative examples include sulfates such as alkyl sulfates, alkyl ether sulfates, alkyl allyl ether sulfates and alkyl amide sulfates, and phosphate esters such as alkyl phosphates, alkyl ether phosphates and alkyl allyl ether phosphates. Anionic surfactants, aliphatic amine salts and their quaternary ammonium salts, benzalkonium salts,
Aromatic quaternary ammonium salts such as benzethonium chloride, pyridinium salts, cationic surfactants exemplified by heterocyclic quaternary ammonium salts such as imidazolinium salts, carboxybetaines, sulfobetaines, aminocarboxylates, imidazoline derivatives, And nonionic surfactants exemplified by ether type such as polyoxyethylene alkyl ether, ether ester type, ester type and nitrogen-containing type.

Among these surfactants, the above-mentioned cationic surfactants are preferable. Among them, amine compounds such as aliphatic amine salts, aliphatic quaternary ammonium salts and aromatic quaternary ammonium salts are used for urethane-based adhesives. It is preferable because it has a function as a catalyst for adjusting the curing speed.

As a method for surface treatment of a thermoplastic resin using a surfactant, a diluted solution of the surfactant is applied to the surface of the thermoplastic resin by a method such as spraying or foam spraying, and a solvent such as water is dried. Surface coating method to form a surfactant thin film on the surface, and internal kneading method in which the surfactant and the thermoplastic resin are pre-blended and then melt-kneaded to create a simple, low-cost treatment. For example, the surface coating method is preferred.

The surface concentration of the surfactant when the surface coating method is used is preferably 0.01 g / m ² or more. This is because the surfactants on the outermost surface are indiscriminately arranged by the surfactants overlapping on the resin surface to some extent, and the hydrophilic groups take on isotropic properties on the outermost surface, and the effect is rapidly manifested. When the amount is 0.01 g / m ² or less, the overlapping of the surfactants is insufficient, and the hydrophilic group cannot have isotropy on the outermost surface.

The urethane-based adhesive used in the present invention includes a two-part urethane adhesive, a lacquer-type one-part urethane adhesive and a block-type urethane adhesive obtained by a reaction between a polyisocyanate and a polyol and a reaction between a urethane prepolymer and a polyol. One-component urethane-based adhesives such as one-component urethane-based adhesives, one-component moisture-curable urethane-based adhesives, one-component UV-curable urethane-based adhesives, and water-dispersed urethane-based adhesives are preferred. Is a one-component moisture-curable urethane-based adhesive. The reason for this is that the one-part type eliminates the need for measurement and mixing before use, and there is no fear of poor mixing.The one-part type eliminates the need for mechanical mixing and simplifies automated equipment. The use of a small amount of phenol is high in safety for workers and the risk of fire can be reduced, and the curability at low temperatures is excellent.

Polyols used in the one-component moisture-curable urethane-based adhesive include polyether polyols such as polyethylene glycol, polyoxypropylene glycol, and polytetramethylene ether glycol;
And polyester polyols such as -methyl-δ-valerolactone and polycaprolactone. As monomeric diisocyanates, tolylene diisocyanate,
4,4-diphenylmethane diisocyanate, xylene diisocyanate, naphthylene diisocyanate, paraphenylene diisocyanate, tetramethyl xylylene diisocyanate, hexamethylene diisocyanate,
Examples thereof include dicyclohexylmethane diisocyanate, inholone diisocyanate, lysine diisocyanate, 4-cyclohexyl isocyanate, hydrogenated xylylene diisocyanate, cyclohexyl diisocyanate, and tolidine diisocyanate.

The one-pack moisture-curable urethane adhesive used in the present invention may contain a filler, a plasticizer,
Auxiliary solvents, curing catalysts, pigments, stabilizers, odor reducing agents and the like may be added.

In the present invention, the adherend adhered to the thermoplastic resin via the urethane-based adhesive is not particularly limited as long as it has good adhesion to the urethane-based adhesive. Examples include plywood, wood, glass,
Various metals and the like can be mentioned. Among them, it has strong adhesiveness, does not require primer treatment of the surface,
Various metals are preferable because they have little deformation even at low temperature and can sufficiently draw out good adhesiveness at low temperature, which is a characteristic of the urethane-based adhesive.

Next, an example in which the surface treatment method for a thermoplastic resin of the present invention is used as a method for bonding an automobile interior material as a specific embodiment will be described below with reference to the drawings.

FIG. 1 shows an embodiment of an automotive interior material used in the method of the present invention, wherein both surfaces of a core layer 10 having a heat-resistant resin as a base resin are made of a thermoplastic resin. The film layers (12, 14) are formed, and the nonwoven fabric layer 20 for the skin material is laminated on the indoor side film layer 12 via the adhesive layer 16. According to the present invention, the surface of the outdoor film layer 14 is subjected to a surface treatment with a surfactant to improve the adhesiveness with the urethane-based adhesive.

FIG. 2 shows a structure of an automobile interior material according to another embodiment of the automobile interior material used in the method of the present invention. , A film layer made of a thermoplastic resin (12, 14)
The non-woven fabric layer 18 (non-woven fabric layer for preventing noise) suitable for the purpose of preventing abnormal noise described later is laminated on the outdoor-side film layer 14, and the adhesive layer 1 is attached to the indoor-side film layer 12.
The nonwoven fabric layer 20 for the skin material is laminated via the intermediate layer 6.
According to the present invention, the surface of the outdoor film layer 14 and the surface of the nonwoven fabric layer 18 for preventing noise are subjected to a surface treatment with a surfactant to improve the adhesion with the urethane-based adhesive.

The core layer 10 of the present invention is mainly for imparting rigidity to the interior material of an automobile, and is made of a material which can be deformed by pressing. The material is a PS resin foam sheet, a modified PPE resin foam sheet, a polyethylene resin foam sheet, a polypropylene resin foam sheet,
Examples thereof include foamed sheets such as rigid or semi-rigid polyurethane resin foam sheets, glass fiber cloth impregnated with thermosetting and thermoplastic resin, felt impregnated with thermosetting resin, paper and plastic cardboard. In this, core layer 1
As 0, a foamed sheet is preferred from the viewpoint of lightness and handling properties, and a modified PPE-based resin foamed sheet is more preferred from the viewpoints of excellent heat resistance and rigidity, as well as workability and easy production.

The thickness of the core layer 10 is preferably 1 to 5 mm. If the thickness is less than 1 mm, the strength and the heat insulating property are poor and the material may not be suitable as a car interior material. 5
When the thickness exceeds mm, it is difficult for heat to be transmitted to the central portion in the thickness direction of the core layer 10 at the time of molding heating, so that sufficient heating cannot be performed and moldability may be deteriorated.

In the automotive interior material according to the present invention, film layers 12 and 14 having a thermoplastic resin as a base resin are laminated on both surfaces of a core layer 10 made of a heat-resistant resin. This is because the movement of the core layer needs to be controlled by the indoor and outdoor film layers for the purpose of controlling deformation during heat resistance and stabilizing the shape of the molded body during molding.

As the thermoplastic resin used for the film layers 12 and 14, any resin known to those skilled in the art can be used as a resin having heat resistance required when used as a member for an automobile interior material. Specific examples and preferable examples thereof are the same as those of the thermoplastic resin used for the surface treatment method of the thermoplastic resin for improving the adhesion to the urethane-based adhesive described above.

Next, the thickness of the film layers 12 and 14 is 50
It is preferably from 300 to 300 µm, more preferably from 75 to 200 µm. When the thickness of the film layer is less than 50 μm, the strength, rigidity, heat resistance, and the like tend to decrease, and when the thickness is more than 300 μm, the moldability tends to deteriorate.

Further, since the outdoor-side film layer 14 is not covered with the nonwoven fabric layer 20 for the skin material which functions as a heat insulating material, the outdoor-side film layer 14 is not covered by the outside air at the time of molding. Susceptible to. Therefore, for the purpose of increasing the heat capacity of the outdoor film layer 14 and making it difficult to cool, it is desirable that the thickness of the outdoor film layer 14 be larger than the thickness of the indoor film layer.

The outdoor film layer 14 is subjected to a surface treatment with a surfactant to improve the adhesiveness with the urethane-based adhesive.

The specific examples of the surfactant used, the method of treatment, and the amount of the surfactant used are as follows. The surfactant used in the surface treatment method of a thermoplastic resin for improving the adhesion with the urethane-based adhesive described above. Same as the activator.

When the film layers 12 and 14 are formed, if necessary, an impact resistance improver, a filler, a lubricant, an antioxidant, a pigment, a stabilizer, an odor reducing agent, etc. may be used alone or in combination of two or more. It may be added.

Another embodiment of the automotive interior material of the present invention is:
As illustrated in FIG. 2, a nonwoven fabric layer 18 for preventing abnormal noise is provided on the surface of the outdoor film layer 14. The non-woven fabric layer 18 for preventing abnormal noise is generated when the vehicle is mounted on an automobile, when the interior of the automobile is rapidly cooled by a cooler or the like, or when traveling on an uneven road surface or traveling on a sharp curve. It is effective in preventing

Further, since the automobile interior material according to the present invention is mounted on the automobile via the non-woven fabric 18 for noise prevention, the automobile interior material is particularly provided at the interface between the outdoor film layer 14 and the non-woven fabric 18 for noise prevention. And stable adhesiveness that does not fall off even when used for a long period of time or under severe environments.

As the non-woven fabric layer 18 for preventing abnormal noise, any type of cloth can be used as long as the raw fibers are bonded with an adhesive, a molten fiber, or a mechanical method.
The type of the raw material fiber is not particularly limited, and any of synthetic fibers, semi-synthetic fibers, and natural fibers can be used. Specifically, synthetic fibers such as polyester, polypropylene, polyamide (nylon), and polyacrylonitrile, and natural fibers such as wool, cotton, and cellulose can be used. Among them, polyester fibers are preferable.
Particularly, polyethylene terephthalate fiber having high heat resistance is preferable. In addition, these fibers can be used alone.
More than one species may be used in combination. Depending on the method of manufacturing and processing the nonwoven fabric, a bonding binder bonding cloth, a needle punch cloth, a spun-pound cloth (sheet), a spray fiber cloth, a stitch bond cloth, or the like can be used, and any nonwoven cloth can be used. Of these, spun-pound cloth (sheet) made of long fiber filaments is preferable. The filament is crimpable, has high strength, has a soft texture, and is convenient for absorbing sound.

The nonwoven layer 18 for preventing abnormal noise, considering the quality and cost, preferably has a basis weight of 10 to 50 g / m ^2, further having a basis weight of 20 to 40 g / m ² Is preferred. If the basis weight is 10 g / m ² or less, the surface of the outdoor film layer 14 may be partially exposed at the portion where the nonwoven fabric layer 18 for preventing abnormal noise is provided, and an effective noise preventing effect may not be exhibited. On the other hand, 50g
If the basis weight is not less than / m ^{2, the} deformation of the nonwoven fabric layer 18 for preventing abnormal noise may cause heat-resistant deformation of the interior material or increase the cost unnecessarily.

As a method of providing the nonwoven fabric layer 18 for noise prevention on the base material for automobile interior materials, the base resin of the outdoor film layer 14 is melted, and the melted base resin of the outdoor film layer 14 is used as a core. It is preferable that the layer 10 and the nonwoven fabric layer 18 for preventing abnormal noise are pressed and laminated without using an adhesive layer. The reason is that the base resin of the outdoor film layer 14 permeates into the non-woven fabric layer 18 for preventing abnormal noise moderately, and a good adhesive property is obtained by an anchor effect. Even when used in harsh environments, stable adhesiveness without falling off can be obtained, and the core layer, film layer, nonwoven fabric layer are laminated at the same time in one process, eliminating the complexity of work, and And the fact that an adhesive layer is not substantially used, so that an increase in manufacturing cost can be suppressed. Furthermore, the adhesive surface of the core layer 10 with the outdoor film layer 14 is hardly damaged by the molten base resin of the outdoor film layer 14, and the bonding of the outdoor film layer 14 and the nonwoven fabric layer 18 for noise prevention is prevented. From the viewpoint of obtaining a stronger adhesiveness, a method of melting the base resin constituting the outdoor film layer 14, bringing the resin into contact with the nonwoven fabric layer 18 for preventing abnormal noise, and then pressing and integrating the same is more preferable.

As a method of providing the nonwoven fabric layer 18 for preventing abnormal noise on the base material for automobile interior materials, it is possible to laminate the same through an adhesive layer, but in a severe environment, particularly in a high temperature use. In order to obtain stable adhesiveness, it is necessary to improve the adhesiveness and heat resistance of the adhesive layer, which increases the manufacturing cost and increases the number of steps for laminating the difficult-to-handle adhesive layer, which complicates the work. May occur.

The nonwoven fabric layer 18 for preventing abnormal noise is subjected to a surface treatment with a surfactant to improve the adhesion to the urethane-based adhesive.

Specific examples of surfactants to be used and the amounts of the surfactants used are the same as those of the surfactants used for the surface treatment of thermoplastic resin for improving the adhesion to the urethane-based adhesive described above. It is.

Here, the method of surface treatment of the nonwoven fabric layer 18 for preventing abnormal noise using a surfactant is not particularly limited. However, a surface coating method in which a diluted solution of a surfactant is applied to the non-woven fabric layer 18 for noise prevention laminated on the outdoor film layer 14 by a method such as spraying or foam spraying and dried is particularly preferable. This is because, in the case of the surface coating method, since the surfactant permeates the nonwoven fabric for noise prevention and reaches the outdoor film layer 14, the surface of the outdoor film layer 14 is simultaneously formed with the nonwoven fabric layer 18 for noise prevention. This is due to the fact that a stronger adhesiveness between the urethane-based adhesive and the interior material of the automobile is developed.

As shown in FIGS. 1 and 2, the automotive interior material of the present invention has an adhesive layer 16 on the surface of the film layer 12 on the indoor side.
The nonwoven fabric layer 20 for the skin material is laminated via the.

As the non-woven fabric layer 20 for the skin material, any type of cloth can be used as long as the raw fibers are bonded with an adhesive, a molten fiber, or a mechanical method. The type of the raw material fiber is not particularly limited, and any of synthetic fibers, semi-synthetic fibers, and natural fibers can be used. Specifically, synthetic fibers such as polyester, polypropylene, polyamide (nylon), and polyacrylonitrile, and natural fibers such as wool, cotton, and cellulose can be used. Among them, polyester fibers are preferable, and particularly high heat resistance is used. Polyethylene terephthalate fibers are preferred.

As the base material of the nonwoven fabric layer 20 for the skin material,
Synthetic resins such as polyester, polyethylene terephthalate, polypropylene, polyamide, polyacrylonitrile, and polyamide (nylon), and natural materials such as wool and cotton can be used, and they can also be used in combination. Further, examples of the skin material include a woven fabric and a nonwoven fabric, but a nonwoven fabric is preferable from the viewpoint of moldability. Examples of the type of nonwoven fabric include a bonding binder bonding fabric, a needle punch fabric, a spun pond fabric, a spray fiber fabric, a stitch bond fabric, and the like, depending on the manufacturing process, and any of the nonwoven fabrics can be used.

As a method of bonding the nonwoven fabric layer 20 for the skin material to the interior material of the vehicle, a method of bonding the skin material to which the adhesive layer 16 has been previously bonded to the base material for the interior material of the vehicle by using a heat roll or the like may be used. A method in which a skin material is temporarily fixed to a base material for an automobile interior material to which an adhesive layer 16 is adhered, and molding and bonding are simultaneously performed during heat molding. A method in which the base resin of the melted indoor side film layer 12 is sandwiched between the core layer 10 and the nonwoven fabric layer 20 for the skin material and pressure-bonded is used. In addition, the base resin of the indoor side film layer 12 is melted at the time of manufacturing the base material for automobile interior materials, and the melted base resin of the indoor side film layer 12 is sandwiched between the core layer 10 and the nonwoven fabric layer 20 for the skin material. This method is more preferable because it does not substantially use an adhesive layer, and thus is advantageous in cost.

Next, in consideration of quality and cost, the nonwoven fabric layer 20 for the skin material preferably has a basis weight of 100 to 300 g / m ² , and more preferably 140 to 20 g / m ^2.
It preferably has a basis weight of 0 g / m ² . 10
If the basis weight is 0 g / m ² or less, a sufficient feeling as an interior material may not be obtained. On the other hand, 300g /
With a basis weight of m ² or more, the molding distortion of the skin material may affect the thermal deformation.

As the adhesive layer 16, one having a function of bonding the indoor side film layer 12 and the nonwoven fabric layer 20 for the skin material by at least a chemical bond such as an intermolecular force, a hydrogen bond, and a covalent bond is used. .

Specific examples of the adhesive layer 16 include thermoplastic adhesives such as vinyl acetate, cellulose, acrylic, polyamide, and polyvinyl acetate, urethane, and the like.
Melamine-based, phenol-based, epoxy-based, polyester-based, acrylic-based thermosetting adhesives, chloroprene rubber-based, nitrile rubber-based, silicone rubber-based rubber-based adhesives, starch, protein, natural rubber, etc. Adhesives and hot melt adhesives. Specific examples of the hot melt adhesive include polyolefin, modified polyolefin, polyurethane, ethylene-vinyl acetate copolymer resin, polyamide, polyester, thermoplastic rubber, styrene-butadiene copolymer, and styrene. And those containing a resin such as an isoprene copolymer as a component.

Next, with respect to the method of bonding the automobile interior material of the present invention, an example of bonding the automobile interior material to the top plate of the automobile via a urethane-based adhesive according to a specific embodiment will be described with reference to FIG. A description will be given based on a) and (b). FIG. 3A is an explanatory cross-sectional view showing a state in which an automobile interior material according to one embodiment of the present invention is bonded to a top plate of an automobile. FIG. 3B shows a non-woven fabric layer 4 for preventing abnormal noise from the outdoor side.
8, an automobile interior material 44 including an outdoor film layer 50, a core layer 52, an indoor film layer 54, and a skin material 56
FIG. 1 is an enlarged view of a main part of an embodiment in which is attached to a ceiling portion of an automobile. , A nonwoven fabric layer 48 for preventing abnormal noise, which is the outermost layer on the outdoor side
In order to improve the adhesion between the urethane-based adhesive layer 46 and
It is attached to the automobile interior material attachment jig 42 fixed to the automobile top plate 40 via the urethane-based adhesive layer 46 from above the unusual noise preventing nonwoven layer 48 surface-treated with a surfactant. Here, the non-woven fabric layer 48 for noise prevention
In the case of FIG. 3B, which is the outermost layer on the outdoor side, since the urethane-based adhesive layer 46 reaches the outdoor-side film layer 50 through the nonwoven fabric layer 48 for preventing abnormal noise, the automobile interior material 4
4 and the vehicle interior material attaching jig 42 are firmly connected via the urethane-based adhesive layer. As a result, it is possible to obtain an automobile interior material that does not fall off the vehicle body even when used for a long period of time or under a severe environment.

When the nonwoven fabric layer 48 for preventing abnormal noise is not used as the outermost layer on the outdoor side, the outermost layer on the outdoor side becomes the outdoor layer 50. In this case, the surface of the outdoor-side film layer (50) is surface-treated with a surfactant, and is fixed to the top plate 40 of the vehicle by the vehicle interior material mounting jig 42 via the urethane-based adhesive layer 46.

[0058]

The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Table 1 shows the resins used in the examples and comparative examples, and Table 2 shows the surfactant, the nonwoven fabric layer for the skin material, the nonwoven fabric layer for the noise control material, and the adhesive layer.

[0059]

[Table 1]

[0060]

[Table 2] In addition, each code regarding the resin shown in Table 1 is as follows. Modified PPE: Modified polyphenylene ether resin PS: Polystyrene resin SMAA copolymer: Methacrylic acid-modified polystyrene resin HIPS: High impact polystyrene resin PET: Polyethylene terephthalate resin Evaluation methods performed in Examples and Comparative Examples are shown below. (Thickness of core layer and molded body) The thickness of the primary foamed sheet and the molded body at 20 locations in the width direction was measured, and the average of the measured values was calculated. (Expansion ratio) Determine the density df of the primary foam sheet according to JIS K
The density dp of the modified PPE resin was measured according to 7222.
Was measured in accordance with JIS K 7112, and determined by the following equation.

Expansion ratio = dp / df (closed cell ratio) Measured according to ASTM D-2859. (Using a multi-pycnometer (manufactured by Beckman)) (Cell diameter) The cross section of the primary foam sheet was observed with an optical microscope, the cell diameters of 20 cells were measured, and the average of the measured values was calculated. (Eye weight) From 5 places in the extrusion direction of the primary foam sheet,
A test piece having a size of 10 cm × 10 cm was cut out, the weight thereof was measured, and the average value was calculated.

(Tensile shear test) 150 mm × 25 mm
Of the test piece was applied, and a urethane-based adhesive was applied to the end of the test piece at a size of 25 mm × 25 mm at 50 g / m ² to obtain a 150 mm ×
Curing is performed for 48 hours in a constant temperature and humidity condition of 20 ° C. and 60% RH in a state where the end portion (25 mm × 25 mm) of the coated steel sheet of 25 mm is stuck and pressed.

Attach the measurement sample to the grip of a tensile tester (Autograph DSS-2000, manufactured by Shimadzu Corporation).
In a thermostat at 3 ° C and 80 ° C, pulling speed 20mm / mi
The shear strength was measured at n (the average value was calculated at N = 5), and the peeled state was observed.

The following criterion was used as a criterion for judgment in consideration of practicality as an interior material of an automobile.・: 400 N or more, or one in which material destruction of the film layer was observed. Δ: 200 to 400 N or delamination between the urethane-based adhesive and the film layer was observed. × 200 N or less (T-type peel test) Two test pieces of 150 mm × 25 mm were sampled, and a urethane-based adhesive was applied at 50 g / m ² to the end of one test piece at a size of 150 mm × 25 mm. The test piece was cured for 48 hours in a constant temperature and humidity condition of 20 ° C. and 60% RH in a state where the end portion (150 mm × 25 mm) of the test piece was stuck and pressed.

Attach the measurement sample to the grip of a tensile tester (Autograph DSS-2000, manufactured by Shimadzu Corporation).
In a thermostat at 3 ° C and 80 ° C, pulling speed 20mm / mi
The T peel strength was measured at n (average value was calculated at N = 5), and the peel state was observed.

The following criterion was used as a criterion for the judgment in consideration of the practicality as an automobile interior material.・: 20 N or more or material destruction of the film layer was observed. Δ ··· 10N or more and 20N or less or delamination between the film layer and the urethane-based adhesive was observed. × ·· 10N or less (Running test) The car interior material was actually attached to the car,
For one month, it was confirmed whether or not the interior material had fallen off and the nonwoven fabric layer for preventing abnormal noise had floated for one month by using a normal automobile.

The following criterion was used as a criterion for judgment in consideration of practicality as an interior material of an automobile.

Presence / absence of falling-off and floating ○ ・ ・ No occurrence of falling-off and floating ×× ・ Presence of falling-off and floating (Example 1) 47.5 parts of SMAA copolymer resin (D) and HIPS resin ( E) 47.5 parts, impact modifier (F)
Five parts of the mixed resin were melted and kneaded with an extruder so that the resin temperature became 245 ° C., and extruded into a film using a T-die.

A surfactant (G) diluted 40 times with water was applied onto the obtained film by spraying at a rate of 8 g per square meter (surface-adhering surfactant concentration: 0.05 g / m ² ). Hot air was blown for 30 seconds to dry the surface to obtain a film surface-treated with the surfactant (G).

The obtained film and the coated steel sheet were bonded via a urethane-based adhesive (H), and a tensile shear test at 23 ° C. and 80 ° C. and a T-peel test were performed. (Example 2) PPE resin (A) 14.3 so that PPE resin component is 10% by weight and PS resin component is 90% by weight.
, A mixed resin obtained by mixing 85.7 parts of HIPS resin with an extruder so that the resin temperature becomes 255 ° C.
Extruded into a film using a die.

A surfactant (G) diluted 40 times with water was applied onto the obtained film by spraying at a rate of 8 g per square meter (surface-adhering surfactant concentration: 0.05 g / m ² ). Hot air was blown for 30 seconds to dry the surface to obtain a film surface-treated with the surfactant (G).

From the obtained film, 25 mm × 150 m
A sample of m was cut out and the coated steel sheet was bonded via a urethane-based adhesive (H), and a tensile shear test at 23 ° C. and 80 ° C. and a T-peel test were performed. (Example 3) PET resin (F) was melted and kneaded with an extruder so that the resin temperature became 270 ° C, and extruded into a film shape using a T die.

A surfactant (G) diluted 40 times with water was applied onto the obtained film by spraying at a rate of 8 g per square meter (surface-adhering surfactant concentration: 0.05 g / m ² ). Hot air was blown for 30 seconds to dry the surface to obtain a film surface-treated with the surfactant (G).

25 mm × 150 m from the obtained film
A sample of m was cut out and the coated steel sheet was bonded via a urethane-based adhesive (H), and a tensile shear test at 23 ° C. and 80 ° C. and a T-peel test were performed. (Example 4) 47.5 parts of SMAA copolymer resin (D) and 47.5 parts of HIPS resin (E), impact modifier (F)
Five parts of the mixed resin were melted and kneaded with an extruder so that the resin temperature became 245 ° C., and extruded into a film using a T-die.

A surfactant (G) diluted 40-fold with water was applied to the obtained film by spraying at a rate of 8 g per square meter (surface-adhering surfactant concentration: 0.05 g / m ² ). Hot air was blown for 30 seconds to dry the surface to obtain a film surface-treated with the surfactant (G).

The obtained film and the coated steel sheet were bonded via a urethane-based adhesive (I) and subjected to a tensile shear test at 23 ° C. and 80 ° C. and a T-peel test. Comparative Example 1 A film was obtained in the same manner as in Example 1, except that the step of treating the surface of the film layer with the surfactant (G) was omitted.

25 mm × 150 m from the obtained film
m sample was cut out and the coated steel sheet was bonded via a urethane-based adhesive (H), and a tensile shear test and a T peel test at 23 ° C and 80 ° C were performed. Comparative Example 2 A film was obtained in the same manner as in Example 2 except that the step of treating the surface of the film layer with the surfactant (G) was omitted. 25mm x 150mm from the obtained film
Was cut out and the coated steel sheet was bonded via a urethane-based adhesive (H), and a tensile shear test and a T peel test at 23 ° C. and 80 ° C. were performed. Comparative Example 3 A film was obtained in the same manner as in Example 3, except that the step of treating the surface of the film layer with the surfactant (G) was omitted. 25mm x 150m from the obtained film
m sample was cut out and the coated steel sheet was bonded via a urethane-based adhesive (H), and a tensile shear test and a T peel test at 23 ° C and 80 ° C were performed. (Comparative Example 4) A surfactant (G) diluted 40 times with water was applied on a film obtained in the same manner as in Example 1 by spraying at a rate of 1 g per square meter (surface-adhering surfactant concentration: 0.006 g). / M ² ), hot air at 80 ° C. was blown for 30 seconds to dry the surface, and a film surface-treated with a surfactant (G) was obtained.

25 mm × 150 m from the obtained film
A sample of m was cut out and the coated steel sheet was bonded via a urethane-based adhesive (H), and a tensile shear test at 23 ° C. and 80 ° C. and a T-peel test were performed.

Table 3 shows the evaluation results of the adhesion between the films obtained in Examples 1 to 4 and Comparative Examples 1 to 4 and the urethane-based adhesive (H).

[0080]

[Table 3] (Example 5) PPE resin component 40% by weight, PS resin component 6
57.1 parts of PPE resin (A) and P
The foaming agent (i) containing iso-butane as a main component per 100 parts by weight of the mixed resin obtained by mixing 42.9 parts of the S resin (B).
(so-butane / n-butane = 85/15) 3.4 parts by weight and talc 0.32 parts by weight were kneaded by an extruder. Extruded by a circular die, wound up in a roll form on a take-up roll via a take-up roll, primary thickness 2.4 m
m, the primary expansion ratio was 12 times, the closed cell ratio was 90%, the cell diameter was 0.19 mm, and the foamed sheet had a basis weight of 180 g / m ² . Next, 47.5 parts of SMAA copolymer resin (D) and HIPS
A mixed resin of 47.5 parts of resin (E) and 5 parts of impact modifier (F) is melted and kneaded with an extruder so that the resin temperature becomes 245 ° C., and extruded into a film using a T-die. , Thickness 1
An outdoor film layer of 20 μm was formed. Next, the sheet having the film layer formed on one side is inverted and fed out from a roll, and the PPE-based resin (A) 28.6 is adjusted to 20% by weight of the PPE-based resin component and 80% by weight of the PS-based resin component.
Parts, and a mixed resin obtained by mixing 71.4 parts of a PS-based resin, was melted and kneaded by an extruder so that the resin temperature became 265 ° C., extruded into a film shape using a T die, and the foamed laminated sheet was left. An indoor side film layer having a thickness of 120 μm was formed on the core layer.

Next, the surfactant (G) diluted 40 times with water was applied onto the outdoor film layer by spraying at a rate of 8 g per square meter (surface-adhering surfactant concentration: 0.05 g / g).
m ² ), hot air of 80 ° C. was blown for 30 seconds to dry the surface, and a foam laminated sheet surface-treated with a surfactant (G) was obtained.

A skin material (J) was temporarily fixed on the indoor side film layer of the obtained foamed laminated sheet via a hot melt film (L).

The foam laminated sheet on which the skin material 1 and the hot melt film (L) are temporarily fixed is clamped on all sides, placed in a heating furnace, heated to a surface temperature of 150 ° C., and plug-molded with a mold adjusted to a temperature of 60 ° C. After performing, trimming and punching were performed to obtain an automobile interior material. A 25 mm × 150 mm sample was cut out from the obtained automobile interior material, and the surface of the outdoor film treated with a surfactant and the coated steel sheet were bonded via a urethane-based adhesive (H).
C. Tensile shear test and T-peel test were conducted.

Next, as shown in FIG. 3, a jig 42 is mounted on the outdoor film layer 50 of the automobile interior material 44 via a urethane-based adhesive 46 (H), and the jig 42 is mounted on the automobile. A running test was performed. (Example 6) Mixed resin 100 in which 57.1 parts of PPE resin (A) and 42.9 parts of PS resin (B) were mixed so that the PPE resin component was 40% by weight and the PS resin component was 60% by weight.
3.4 parts by weight of a foaming agent containing iso-butane as a main component (iso-butane / n-butane = 85/15) and 0.32 parts by weight of talc were kneaded by an extruder with respect to parts by weight. Extruded by a circular die, wound up in a roll form on a take-up roll via a take-up roll, primary thickness 2.4 mm, primary expansion ratio 12 times, closed cell ratio 90%,
A foam sheet having a cell diameter of 0.19 mm and a basis weight of 180 g / m ² was obtained. Next, 47.5 parts of SMAA copolymer resin (D) and HI
A resin mixture of 47.5 parts of PS resin (E) and 5 parts of impact resistance modifier (F) is melted and kneaded with an extruder so that the resin temperature becomes 245 ° C., and formed into a film using a T-die. Extrusion, spunbond sheet (K) as nonwoven fabric layer for noise prevention
(Basis weight: 30 g / m ² ), and a film-like film layer in a molten state is first brought into contact with a spunbond sheet (K), and then a film-like film layer in a molten state is spunbonded with a core layer. The sheets were laminated so as to be sandwiched between sheets (K) to form an outdoor film layer having a thickness of 120 μm.

Next, the sheet having a film layer formed on one side is inverted and fed out of a roll, and the PPE resin component 2
0% by weight and 80% by weight of the PS resin component.
A mixed resin obtained by mixing 28.6 parts of E-based resin (A) and 71.4 parts of PS-based resin is melted and kneaded with an extruder so that the resin temperature becomes 265 ° C., and formed into a film using a T-die. Extruded, thickness 120μ on the remaining core layer of the foam laminated sheet
m of the indoor side film layer was formed.

Next, a surfactant (G) diluted 40 times with water was applied to the surface on which the spunbond sheet (K) was laminated by spraying 8 g per square meter (surface-adhering surfactant concentration 0.05 g / m ^2). ) And then blowing hot air of 80 ° C for 30 seconds to dry the surface to obtain a foamed laminated sheet surface-treated with a surfactant (G).

A skin material (J) was temporarily fixed on a room-side film layer of the obtained foamed laminated sheet via a hot melt film (L).

The foam laminated sheet, on which the skin material (J) and the hot melt film (L) are temporarily fixed, is clamped on all sides, placed in a heating furnace, heated to a surface temperature of 150 ° C., and plugged with a mold adjusted to a temperature of 60 ° C. After the molding, trimming and punching were performed to obtain an automobile interior material. A 25 mm × 150 mm sample was cut out from the obtained automobile interior material, and the surface of a spun bond sheet treated with a surfactant and a coated steel sheet were bonded via a urethane-based adhesive (H).
C. and 80.degree. C. tensile shear test and T-peel test.

Next, as shown in FIG. 3, the jig 42 is placed on the spunbond sheet, which is the non-sound-preventing nonwoven fabric layer 48 of the automobile interior material 44, via a urethane-based adhesive 46 (H). The vehicle was mounted, mounted on a car, and tested for running. (Comparative Example 5) Surfactant (G) for the surface of the outdoor film layer
A foam laminated sheet having a film layer laminated on both sides was obtained in the same manner as in Example 4 except that the step of treating was omitted. On the indoor side film layer of the obtained foamed laminated sheet,
The skin material (J) was temporarily fixed via a hot melt film (J). The four sides of the foam laminated sheet where the skin material 1 and the hot melt film (J) are temporarily fixed are clamped, placed in a heating furnace, heated to a surface temperature of 150 ° C., and subjected to plug molding with a mold adjusted to a temperature of 60 ° C. , Trimming and punching to obtain an automobile interior material. A 25 mm × 150 mm sample was cut out from the obtained automobile interior material, and the outdoor film surface and the coated steel plate were bonded via a urethane-based adhesive (H), and a tensile shear test and a T-type peel test at 23 ° C. and 80 ° C. Was done.

Next, as shown in FIG. 3, the jig 42 is mounted on the outdoor film layer 50 of the automobile interior material 44 via the urethane adhesive 46 (H), and the jig 42 is mounted on the automobile. A running test was performed. (Comparative Example 6) Except for omitting the step of treating the surface of the spunbond sheet (K) with the surfactant (G), a film layer was laminated on both surfaces in the same manner as in Example 6 to form a film on the outdoor film layer. To obtain a foam laminated sheet in which a spun bond sheet (K) was laminated. A skin material (J) is coated with a hot melt film (L) on the indoor side film layer of the obtained foamed laminated sheet.
Temporarily fixed via. Four sides of the foam laminated sheet where the skin material (J) and the hot melt film (L) are temporarily fixed are clamped, placed in a heating furnace, and heated to a surface temperature of 150 ° C., and 60 ° C.
After performing plug molding with a temperature-controlled mold, trimming and punching were performed to obtain an automobile interior material. A 25 mm × 150 mm sample was cut out from the obtained automobile interior material, and the surface of the spunbond sheet and the coated steel sheet were bonded via a urethane-based adhesive (H), and a tensile shear test and a T-peel test at 23 ° C. and 80 ° C. Was done.

Next, as shown in FIG. 3, the jig 42 is placed on the spunbond sheet which is the non-sound-preventing nonwoven fabric layer 48 of the automobile interior material 44 via the urethane-based adhesive 46 (H). The vehicle was mounted, mounted on a car, and tested for running.

Table 4 shows the evaluation results of the automotive interior materials obtained in Examples 5 to 6 and Comparative Examples 5 to 6.

[0093]

[Table 4]

[0094]

The surface treatment method of a thermoplastic resin according to the present invention is superior in simplicity as compared with the conventional surface treatment method, and can greatly improve the adhesiveness with a urethane-based adhesive at a low cost. And

[Brief description of the drawings]

FIG. 1 is an enlarged sectional explanatory view of a main part of an automobile interior material according to the present invention.

FIG. 2 is an enlarged sectional explanatory view of a main part of an automobile interior material according to the present invention.

FIG. 3 (a) is an explanatory cross-sectional view of a ceiling portion of an automobile to which automobile interior materials are attached. FIG. 3B is an enlarged explanatory view of the vicinity of the interior material mounting jig on the ceiling portion of the vehicle to which the vehicle interior material is mounted.

[Description of Signs] 10; Core layer 12: Indoor side film layer 14: Outdoor side film layer 16; Adhesive layer 18: Non-woven fabric layer for abnormal noise prevention 20: Non-woven fabric layer for skin material 40: Car top plate 42 : Automotive interior material mounting jig 44; Automotive interior material 46: Urethane-based adhesive layer 48: Non-woven fabric layer for noise prevention 50: Outdoor film layer 52: Core layer 54: Indoor film layer 56: Skin material

Claims (9)

[Claims] 1. A thermoplastic resin, characterized in that a surfactant is applied in advance to the surface of the thermoplastic resin when the thermoplastic resin is adhered to an object using a urethane-based adhesive. Surface treatment method. 2. The method according to claim 1, wherein the thermoplastic resin is a resin selected from a polystyrene resin, a polyester resin, and a polyphenylene ether resin. 3. The method according to claim 1, wherein the urethane-based adhesive is a one-component moisture-curable urethane-based adhesive. 4. The surface treatment method for a thermoplastic resin according to claim 1, wherein the surfactant is a cationic surfactant. 5. The method according to claim 1, wherein the cationic surfactant is an amine compound such as an aliphatic amine salt, an aliphatic quaternary ammonium salt or an aromatic quaternary ammonium salt. The surface treatment method for a thermoplastic resin according to the above item. 6. The thermoplastic resin according to claim 1, wherein the surface of the adhesive surface of the thermoplastic resin has a surfactant adhesion concentration of 0.01 g / m ² or more. Surface treatment method. 7. The surface according to any one of claims 1 to 6, wherein, when the vehicle interior material made of a thermoplastic resin is bonded to a vehicle body using a urethane-based adhesive, the surface of the vehicle interior material is previously bonded to the bonding surface. A method for bonding automotive interior materials, comprising applying a urethane-based adhesive after application of the treatment, followed by pressing. 8. The bonding method for an automobile interior material according to claim 7, wherein the adhesion surface of the automobile interior material is a film made of a resin selected from a polystyrene resin, a polyester resin, and a polyphenylene ether resin. 9. The bonding method for an automobile interior material according to claim 7, wherein the bonding surface of the automobile interior material is a spunbond sheet made of a polyester resin.