JP2010264786A - Vehicle door trim - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle door trim having an armrest which secures the rigidity in normal use and reduces an impact to an occupant by being easily deformed on a side collision of a vehicle. <P>SOLUTION: The vehicle door trim includes a trim board and an armrest body 20. A plurality of side walls 23 are provided on the flange 21 of the armrest body 20. A plurality of first connection walls 24, which continues from the cabin interior end of one side wall 23 and continues to the cabin interior end of the adjacent side wall 23, and a plurality of second connection walls 25, which continues from the cabin exterior end of one side wall 23 and continues to the cabin exterior end of the adjacent side wall 23, are provided alternately. Fastening portions 26, which fasten the armrest body 20 to the trim board, are formed on part of the first connection walls 24. Gaps 27 are each formed between the first connection walls 24A, on which the fastening portion 26 is formed, and a flange surface 21A, and between fastening portion side walls 23A, which continue to the first connection walls 24A, and the flange surface 21A. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a door trim in which an armrest is deformed by being pressed by an occupant at the time of a side collision of a vehicle to reduce an impact on the occupant.

  As a door trim that reduces the impact on the occupant when the armrest is deformed by being pressed by the occupant at the time of a side collision of the vehicle (also referred to as a side collision), for example, a door trim described in Patent Document 1 is known. It has been.

  In the door trim described in Patent Document 1, an armrest is assembled to an opening provided in a trim board disposed on the indoor side of the inner panel, and the armrest is connected via a flange provided in a peripheral portion. It is attached to a mounting boss provided on the back side surface (the surface on the inner panel side) of the trim board. The flange portion of the armrest is provided with a step portion that is arranged along the periphery of the opening of the trim board. When an impact is applied to the armrest at the time of a side collision, the mounting boss is welded and fractured, abutting against the inner panel, the stepped portion is crushed and broken, and the armrest absorbs the impact step by step.

Japanese Patent Laid-Open No. 11-286232

In the thing of the said patent document 1, in order to further reduce the impact which a passenger | crew receives from an armrest at the time of a side collision, it is necessary to make a level | step-difference part easy to deform | transform.
However, if the thickness of the stepped portion is reduced in order to facilitate the deformation of the stepped portion, the rigidity of the armrest during normal use may be reduced.

  The present invention has been completed based on the above-described circumstances, and can secure deformation as an armrest during normal use, and can be easily deformed at the time of a vehicle collision to reduce the impact on an occupant. An object of the present invention is to provide a vehicle door trim having an armrest that can be used.

  In order to solve the above-mentioned problems, the present invention is a vehicle door trim comprising a trim board disposed in a vehicle interior and having an opening for attaching an armrest, and an armrest attached to the opening of the trimboard. A flange portion is formed on the periphery of the armrest on the opening edge of the opening portion of the trim board, and a flange portion is formed so as to project outward from the passenger compartment. The flange portion is provided on the vehicle interior side of the armrest. A plurality of side walls extending from the vehicle interior side to the vehicle interior outer side are provided on the flange surface connected to the surface to be disposed at intervals in the length direction of the flange portion. A first connecting wall connected to the end portion of the side wall adjacent to the vehicle interior side, and an end portion of the side wall adjacent to the side wall adjacent to the end portion of the side wall adjacent to the vehicle interior side A plurality of continuous second connecting walls are alternately provided, and the armrest is fastened to the outer side surface of the trim board on the whole or a part of the first connecting walls among the plurality of first connecting walls. A fastening portion that is provided, and between the first connection wall provided with the fastening portion and the flange surface, and a side wall and the flange surface that are continuous with the first connection wall provided with the fastening portion. It is characterized in that a gap is formed between each.

  In the vehicle door trim of the present invention, the flange portion attached to the trim board of the armrest has a plurality of side walls, a first connecting wall that is continuous at the end of the adjacent side wall on the vehicle interior side, and an adjacent side wall. The second connection wall that is continuous at the end portion outside the vehicle interior is alternately provided, and a fastening portion is provided in a part of the first connection wall. A gap is formed between the fastening portion and a side wall (also referred to as a “fastening portion side wall”) connected to the fastening portion.

  When a passenger collides with an armrest due to a secondary collision at the time of a side collision of the vehicle, stress concentrates on a fastening portion to which a trim board of the armrest is fastened, and a shearing force works. In this invention, since the clearance gap is formed between the fastening part and the flange surface and between the side wall connected to the fastening part and the flange surface, the fastening part side wall is easily stretched. Therefore, in the present invention, since the armrest is easily deformed by the impact of the shock due to expansion and contraction of the side wall of the fastening portion between the first connection wall and the second connection wall, the armrest is attached to the trim board. There is no need to reduce the thickness of the part. As a result, according to the present invention, it is possible to provide a vehicle door trim including an armrest that can be easily deformed at the time of a vehicle side collision and reduce impact on passengers while ensuring rigidity during normal use. Can do.

The present invention may have the following configurations.
Among the armrests, at least the fastening portion and a side wall connected to the first connection wall provided with the fastening portion are made of a thermoplastic resin composition, and the thermoplastic resin composition is made of a thermoplastic resin (A ) And a resin having a reactive functional group (B), and in the morphology of the resin composition observed by transmission electron tomography, one of (A) or (B) is a continuous phase, One of them forms a dispersed phase, and a three-dimensional connected structure Cs containing the continuous phase component is formed in the dispersed phase, and among the dispersed phases, the dispersed phase Dp having an average particle diameter of 1000 nm or less The area ratio of the connecting structure Cs in the cross section may be 10% or more.

  In the above configuration, at least a fastening portion and a side wall (fastening portion side wall) connected to the first connecting wall provided with the fastening portion of the armrest have sufficient rigidity during normal use. However, a thermoplastic resin composition having a characteristic that the tensile elastic modulus is rapidly lowered by increasing the tensile speed or raising the temperature is used. At the time of a side collision of the vehicle, the fastening portion is pulled at a higher speed than during normal use, and stress concentrated on the fastening portion tends to be converted into thermal energy and become high temperature. Therefore, according to the above configuration, the side wall of the fastening portion easily extends during a side collision, so that the armrest is further easily deformed.

  Among the armrests, at least the fastening portion and a side wall connected to the first connection wall provided with the fastening portion are made of a thermoplastic resin composition, and the thermoplastic resin composition is made of a thermoplastic resin (A ) And a resin (B) having a reactive functional group, and in the tensile test of the molded article of the thermoplastic resin composition, the tensile modulus at tensile speeds V1 and V2 is E (V1), Assuming E (V2), when V1 <V2, it is E (V1)> E (V2), or the tensile elongation at break when the tensile speeds V1 and V2 are ε (V1) and ε (V2) Then, when V1 <V2, it is preferable to satisfy the relationship of ε (V1) <ε (V2), and it is more preferable to satisfy both relationships at the same time.

  In the above configuration, when the thermoplastic resin composition is a molded product, the tensile elastic modulus decreases when the tensile speed becomes high, and the tensile breaking elongation increases when the tensile speed becomes high. One or both of. Therefore, according to the above configuration, at the time of a side collision in which the fastening portion is pulled at a higher speed than during normal use, the tensile elastic modulus of the fastening portion is reduced, the breaking elongation is increased, and the fastening portion side wall is easily stretched. Promotes deformation of the armrest.

  According to the present invention, it is possible to provide a vehicle door trim including an armrest that can be easily deformed at the time of a side collision of a vehicle and reduce an impact on an occupant while ensuring rigidity as an armrest during normal use. Can do.

Front view of the door trim of the first embodiment viewed from the vehicle interior side Perspective view of armrest viewed from above Enlarged perspective view of the flange The graph which showed the characteristic (relation between stress and elongation) of the thermoplastic resin composition used in Embodiment 1 The graph which showed the characteristic (relationship between a temperature and an elastic modulus fall rate) of the thermoplastic resin composition used in Embodiment 1 1 is a cross-sectional view taken along line AA in FIG. 1 showing an armrest attached state during normal use. Top view of the flange during normal use 1 is a cross-sectional view taken along the line AA in FIG. Top view of the flange during a side impact

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view of a door trim 10 according to the present embodiment as viewed from the vehicle interior side. As shown in FIG. 1, the door trim 10 of the present embodiment includes a trim board 11 formed in a plate shape with a synthetic resin or the like, and an armrest 13 attached to the trim board 11. Further, the door trim 10 includes a door inside handle 12 and a door pocket 15 on the vehicle interior side.

  The trim board 11 is a member that constitutes the main body of the door trim 10 and is integrally formed of synthetic resin. The trim board 11 is formed with an opening 16 for attaching the armrest 13 from the rear surface (vehicle outer surface) side. When the armrest 13 is attached to the opening 16, the opening 16 is closed, and the surface of the armrest 13 (the surface on the vehicle interior side) and the surface of the trim board 11 (the surface on the vehicle interior side) are substantially flush. It becomes.

  The armrest 13 attached to the opening 16 of the trim board 11 has an operation switch unit 14 that performs operations such as opening and closing of a window on the front side of the vehicle, and an armrest body 20 on the rear side of the vehicle. The armrest body 20 is formed so as to project to the vehicle interior side. The left side in FIG. 1 is the vehicle front side, and the right side is the vehicle rear side.

  FIG. 2 is a perspective view of the armrest body 20 as viewed from above. In this embodiment, the thickness of the armrest body 20 is set to 2.0 to 2.5 mm, and practical strength during normal use is ensured. Of the periphery of the armrest body 20 (the edge portion disposed on the opening edge 17 of the opening portion 16 of the trim board 11), flanges are formed on the upper edge and the lower edge so as to project outward in the vehicle interior direction (right side in the figure). A portion 21 is provided. A flange surface 21 </ b> A that is continuous with the surface of the flange portion 21 that is disposed on the vehicle interior side of the armrest body 20 is provided with a portion 22 that is uneven as a whole along the length direction of the flange portion 21.

  The concavo-convex portion 22 includes a plurality of first sidewalls that connect a plurality of side walls 23 extending from the vehicle interior side to the vehicle compartment outer side direction (width direction of the flange portion 21) and the end portions of the adjacent side walls 23 on the vehicle interior side. The connecting wall 24 includes a plurality of second connecting walls 25 that connect the end portions of the side walls 23 adjacent to each other outside the passenger compartment. The plurality of side walls 23 are provided at intervals along the length direction of the flange portion 21, and the first connection walls 24 and the second connection walls 25 are provided alternately.

  The first connecting wall 24 continues from the end portion of the side wall 23 on the vehicle interior side and continues to the end portion of the adjacent side wall 23 on the vehicle interior side, and is disposed along the vehicle exterior side surface of the trim board 11. The connecting wall 25 continues from the end of the side wall 23 outside the passenger compartment to the end of the adjacent side wall 23 outside the passenger compartment.

  In the present embodiment, as shown in FIG. 2, a boss insertion hole 26 (fastening portion 26) through which a boss (not shown) for fastening to the outer side surface of the trim board 11 is inserted as the first connecting wall 24. ) Are formed alternately and first connection walls 24B in which the boss insertion holes 26 (fastening portions 26) are not formed.

As shown in FIG. 2 and FIG. 3, the side wall between the first connecting wall 24 </ b> A in which the fastening portion 26 is formed and the flange surface 21 </ b> A and the first connecting wall 24 </ b> A in which the fastening portion 26 is formed. A gap 27 is provided between each flange 23 (referred to as a fastening portion side wall 23A) and the flange surface 21A. The first connecting wall 24B in which the fastening portion 26 is not formed, the side wall 23B connected to the first connecting wall 24B, and the second connecting wall 25 are erected from the flange surface 21A, and the gap 27 is Not provided.
In the present embodiment, the convex portion composed of the first connecting wall 24B in which the fastening portion 26 is not formed and the side wall 23B connected to the first connecting wall 24B is formed on the trim board 11 from the outside of the vehicle. The arm rest body 20 has a function of positioning the armrest body 20 in the width direction with respect to the trim board 11.

  Next, the material of the armrest main body 20 used in this embodiment will be described. As a material for the armrest body 20, a thermoplastic resin composition containing a thermoplastic resin (A) and a resin (B) having a reactive functional group is used.

  The thermoplastic resin (A) contained in the thermoplastic resin composition is not particularly limited as long as it is a resin that can be molded by heating and melting. For example, polyamide resin, polyester resin, polyphenylene sulfide resin, polyacetal resin, Polyphenylene oxide resin, polycarbonate resin, polylactic acid resin, polysulfone resin, polytetrafluoroethylene resin, polyetherimide resin, polyamideimide resin, polyimide resin, polyethersulfone resin, polyetherketone resin, polythioetherketone resin, polyetherether Preferred is at least one thermoplastic resin selected from ketone resins, polyethylene resins, polypropylene resins, styrene resins such as polystyrene resins and ABS resins, rubbery polymers, polyalkylene oxide resins, and the like. It can be mentioned properly.

  Among the thermoplastic resins shown above, polyamide resins, polyester resins, polyphenylene sulfide resins, polyacetal resins, styrene resins, polyphenylene oxide resins, polycarbonate resins, and polylactic acid resins are preferably used. Polyester resins and polyphenylene oxide resins are most preferably used because of their high end group reactivity.

  The polyamide resin is a resin composed of a polymer having an amide bond, and is mainly composed of amino acid, lactam or diamine and dicarboxylic acid. Representative examples of the raw materials include amino acids such as 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid and paraaminomethylbenzoic acid, lactams such as ε-caprolactam and ω-laurolactam, tetramethylenediamine, hexa Methylenediamine, 2-methylpentamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- / 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, metaxylenediamine, paraxylyl Range amine, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl) cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) Methane, bis (3- Aliphatic, alicyclic, aromatic diamines and adipic acid such as methyl-4-aminocyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine, aminoethylpiperazine, Superic acid, azelaic acid, sebacic acid, dodecanedioic acid, terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, hexa Examples thereof include aliphatic, alicyclic, and aromatic dicarboxylic acids such as hydroisophthalic acid, and in this embodiment, polyamide homopolymers or copolymers derived from these raw materials may be used alone or in the form of a mixture. it can.

  Specific examples of particularly useful polyamide resins include polycaproamide (polyamide 6), polyhexamethylene adipamide (polyamide 66), polyundecanamide (polyamide 11), polydodecanamide (polyamide 12), polytetra Methylene adipamide (polyamide 46), polyhexamethylene sebamide (polyamide 610), polyhexamethylene dodecamide (polyamide 612), polyhexamethylene adipamide / polyhexamethylene terephthalamide copolymer (polyamide 66 / 6T), Polyhexamethylene adipamide / polyhexamethylene isophthalamide copolymer (polyamide 66 / 6I), polyhexamethylene adipamide / polyhexamethylene terephthalamide / polyhexamethylene isophthalamide copolymer ( Polyamide 66 / 6T / 6I), polyxylylene adipamide (polyamide XD6), and mixtures thereof or copolymers, and the like.

  Particularly preferred examples include polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 6/66 copolymer, polyamide 6/12 copolymer, and the like. Although it is also practically suitable to use as a mixture according to required properties such as heat resistance, toughness, and surface properties, among them, polyamide 6, polyamide 66, polyamide 11, and polyamide 12 are most preferable.

  The degree of polymerization of these polyamide resins is not particularly limited, and the relative viscosity measured at 25 ° C. in a 1% concentrated sulfuric acid solution is in the range of 1.5 to 5.0, particularly in the range of 2.0 to 4.0. Are preferred.

  In the present embodiment, the polyester resin is a thermoplastic resin composed of a polymer having an ester bond in the main chain, and is a dicarboxylic acid (or an ester-forming derivative thereof) and a diol (or an ester-forming property thereof). A polymer or copolymer obtained by a condensation reaction mainly comprising a derivative) or a mixture thereof is preferably mentioned.

  Examples of the dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methane, anthracene dicarboxylic acid, and 4,4′-diphenyl ether dicarboxylic acid. Acid, aromatic dicarboxylic acid such as 5-sodiumsulfoisophthalic acid, adipic acid, sebacic acid, azelaic acid, aliphatic dicarboxylic acid such as dodecanedioic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, etc. And alicyclic dicarboxylic acids and ester-forming derivatives thereof. The diol component is an aliphatic glycol having 2 to 20 carbon atoms, that is, ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol. , Cyclohexanedimethanol, cyclohexanediol and the like, or long-chain glycols having a molecular weight of 400 to 6000, that is, polyethylene glycol, poly-1,3-propylene glycol, polytetramethylene glycol and the like, and ester-forming derivatives thereof.

  Preferred examples of these polymers or copolymers include polybutylene terephthalate, polybutylene (terephthalate / isophthalate), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), Polybutylene naphthalate, polyethylene terephthalate, polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / 5-sodium sulfoisophthalate), polybutylene (terephthalate / 5-sodium sulfoisophthalate), polyethylene Naphthalate, polycyclohexanedimethylene terephthalate, etc. Polybutylene terephthalate, polybutylene (terephthalate / adipate), polybutylene (terephthalate / decane dicarboxylate), polybutylene naphthalate, polyethylene terephthalate, polyethylene (terephthalate / adipate), polyethylene naphthalate, polycyclohexanedimethylene terephthalate, etc. Particularly preferred is polybutylene terephthalate (polybutylene terephthalate resin).

  The polybutylene terephthalate resin preferably has an intrinsic viscosity of 0.36 to 1.60, particularly 0.52 to 1.25, measured at 25 ° C. using an o-chlorophenol solvent. Moreover, you may use together polybutylene terephthalate resin from which intrinsic viscosity differs, and it is preferable that intrinsic viscosity exists in the range of 0.36-1.60.

  Further, the polybutylene terephthalate resin is durable if the COOH end group amount determined by potentiometric titration of the m-cresol solution with an alkaline solution is in the range of 1 to 50 eq / t (end group amount per ton of polymer). From the point of anisotropy suppressing effect, it can be preferably used.

  Specific examples of the polyphenylene oxide resin include poly (2,6-dimethyl-1,4-phenylene oxide), poly (2-methyl-6-ethyl-1,4-phenylene oxide), and poly (2,6 -Diphenyl-1,4-phenylene oxide), poly (2-methyl-6-phenyl-1,4-phenylene oxide), poly (2,6-dichloro-1,4-phenylene oxide) and the like. Further, a copolymer such as a copolymer of 2,6-dimethylphenol and other phenols (for example, 2,3,6-trimethylphenol) can be mentioned. Among them, poly (2,6-dimethyl-1,4-phenylene oxide) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferable, and in particular, poly (2,6-dimethyl) -1,4-phenylene oxide) is preferred.

  The polyphenylene oxide resin preferably has a reduced viscosity (0.5 g / dl chloroform solution) measured at 30 ° C. in the range of 0.15 to 0.70.

  The method for producing such a polyphenylene oxide resin is not particularly limited, and those obtained by a known method can be used. For example, it can be easily produced by oxidative polymerization using as a catalyst a complex of cuprous salt and amine by Hay described in US Pat. No. 3,306,874.

The resin (B) having a reactive functional group is a resin having a reactive functional group in a molecular chain.
As the resin serving as the base of the resin (B) having a reactive functional group used in the present embodiment, a thermoplastic resin different from the above-described thermoplastic resin (A) is used. The resin serving as the base of the resin (B) having a reactive functional group is not particularly limited, but is preferably a polyamide resin, a polyester resin, a polyphenylene sulfide resin, a polyphenylene oxide resin, a polycarbonate resin, a polylactic acid resin, a polysulfone resin, or a polyacetal. Resin, tetrafluoropolyethylene resin, polyetherimide resin, polyamideimide resin, polyimide resin, polyethersulfone resin, polyetherketone resin, polythioetherketone resin, polyetheretherketone resin, polyethylene resin, polypropylene resin, polystyrene resin, It is possible to use at least one resin selected from styrene resins such as ABS resin, rubber polymer, polyalkylene oxide resin and the like so as to be different from the above-mentioned thermoplastic resin (A). Can. Among them, the resin used as the base of the resin (B) having a reactive functional group is more preferably a polyethylene resin, a polypropylene resin, a styrene resin, or a rubbery polymer because of the ease of introduction of the reactive functional group, and further, impact resistance. From the viewpoint of the effect of improving characteristics and toughness, a rubbery polymer is more preferable.

  In the present embodiment, the rubbery polymer generally contains a polymer having a glass transition temperature lower than room temperature, and some of the molecules are bound to each other by covalent bonds, ionic bonds, van der Waals forces, entanglement, etc. Polymer. Examples of rubber polymers include polybutadiene, polyisoprene, styrene-butadiene random copolymers and block copolymers, hydrogenated products of the block copolymers, acrylonitrile-butadiene copolymers, butadiene-isoprene copolymers, and the like. Diene rubber, ethylene-propylene random copolymer and block copolymer, ethylene-butene random copolymer and block copolymer, ethylene and α-olefin copolymer, ethylene-acrylic acid, ethylene -Ethylene-unsaturated carboxylic acid copolymer such as methacrylic acid, ethylene-acrylic acid ester, ethylene-unsaturated carboxylic acid ester copolymer such as ethylene-methacrylic acid ester, part of unsaturated carboxylic acid is a metal salt A certain ethylene-acrylic acid-acrylic acid metal salt Acrylic elasticity such as ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymer such as ethylene-methacrylic acid-methacrylic acid metal salt, acrylic ester-butadiene copolymer such as butyl acrylate-butadiene copolymer Polymers, copolymers of ethylene and fatty acid vinyl such as ethylene-vinyl acetate, ethylene-propylene non-conjugated diene terpolymers such as ethylene-propylene-ethylidene norbornene copolymer, ethylene-propylene-hexadiene copolymer Preferred examples include thermoplastic elastomers such as butylene-isoprene copolymer, chlorinated polyethylene, polyamide elastomer, and polyester elastomer.

When a polyamide resin is used as the thermoplastic resin (A), among these, from the viewpoint of compatibility, ethylene-unsaturated carboxylic acid ester copolymer, ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymer Coalescence is preferably used.
The unsaturated carboxylic acid ester in the ethylene-unsaturated carboxylic acid ester copolymer is a (meth) acrylic acid ester, preferably an ester of (meth) acrylic acid and an alcohol. Specific examples of unsaturated carboxylic acid esters include (meth) acrylic acid such as methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylate-2-ethylhexyl, stearyl (meth) acrylate Examples include esters.

  The weight ratio of the ethylene component to the unsaturated carboxylic acid ester component in the copolymer is not particularly limited, but is preferably in the range of 90/10 to 10/90, more preferably 85/15 to 15/85.

  The number average molecular weight of the ethylene-unsaturated carboxylic acid ester copolymer is not particularly limited, but is preferably in the range of 1000 to 70000 from the viewpoint of fluidity and mechanical properties.

  Specific examples of the unsaturated carboxylic acid in the ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymer include (meth) acrylic acid. Examples of unsaturated carboxylic acid metal salts include (meth) acrylic acid metal salts. Although the metal of unsaturated carboxylic acid metal salt is not specifically limited, Preferably, alkali metals, such as sodium, alkaline-earth metals, such as magnesium, zinc etc. are mentioned.

  The weight ratio of the unsaturated carboxylic acid component to the unsaturated carboxylic acid metal salt component in the ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymer is not particularly limited, but preferably 95/5 to 5/95, More preferably, it is the range of 90/10-10/90.

  The number average molecular weight of the ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymer is not particularly limited, but is preferably in the range of 1000 to 70000 from the viewpoint of fluidity and mechanical properties.

  The reactive functional group contained in the resin (B) having a reactive functional group is not particularly limited as long as it reacts with the functional group present in the thermoplastic resin (A), preferably an amino group, Examples thereof include at least one selected from a carboxyl group, a carboxyl metal salt, a hydroxyl group, an acid anhydride group, an epoxy group, an isocyanate group, a mercapto group, an oxazoline group, and a sulfonic acid group. Of these, amino groups, carboxyl groups, carboxyl metal salts, epoxy groups, acid anhydride groups, and oxazoline groups are more preferred because they are highly reactive and have few side reactions such as decomposition and crosslinking.

  When the acid anhydride group is introduced into the rubbery polymer, the method can be carried out by a generally known technique and is not particularly limited. For example, maleic anhydride, itaconic anhydride, endic acid anhydride, A method of copolymerizing acid anhydrides such as citraconic anhydride and 1-butene-3,4-dicarboxylic acid anhydride and a monomer that is a raw material of the rubber polymer, grafting the acid anhydride onto the rubber polymer Or the like can be used.

  In addition, when the epoxy group is introduced into the rubbery polymer, the method can be carried out by a generally known technique and is not particularly limited. For example, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, itacon A method of copolymerizing a vinyl monomer having an epoxy group, such as a glycidyl ester compound of an α, β-unsaturated acid such as glycidyl acid, with a monomer which is a raw material of a rubbery polymer, having the above functional group A method of polymerizing a rubbery polymer using a polymerization initiator or a chain transfer agent, a method of grafting an epoxy compound onto a rubbery polymer, or the like can be used.

  Further, when the oxazoline group is introduced into the rubbery polymer, the method can be carried out by a generally known technique and is not particularly limited. For example, 2-isopropenyl-oxazoline, 2-vinyl-oxazoline, 2 A method of copolymerizing a vinyl monomer having an oxazoline group such as -acryloyl-oxazoline or 2-styryl-oxazoline with a monomer which is a raw material of a rubbery polymer can be used.

  The number of functional groups per molecular chain in the resin (B) having a reactive functional group is not particularly limited, but usually 1 to 10 is preferable, and 1 to 5 in order to reduce side reactions such as crosslinking. Preferably. Moreover, although the molecule | numerator which does not have a functional group at all may be contained, it is so preferable that the ratio is small.

  Although there is no restriction | limiting in particular about the compounding ratio of the thermoplastic resin (A) and resin (B) which has a reactive functional group in this embodiment, Resin which has the weight Aw of a thermoplastic resin (A), and a reactive functional group The ratio Aw / Bw to the weight Bw of (B) is preferably in the range of 5/95 to 95/5, more preferably in the range of 10/90 to 90/10, and most preferably in the range of 15/85 to 85/15. preferable. When Aw / Bw is lower than 5/95, the reaction between the resins (B) having reactive functional groups becomes remarkable, and there is a tendency that molding processing becomes difficult due to an increase in viscosity, and Aw / Bw is 95/5. If the ratio exceeds 1, the amount of the functional group that reacts with the thermoplastic resin (A) decreases, and the effect of improving the mechanical properties of the thermoplastic resin composition and the manifestation effect of unique viscoelastic behavior tend to be small, which is not preferable. .

  In the thermoplastic resin composition used in this embodiment, the structure is observed by transmission electron beam tomography (TEMT). TEMT is a microscopy method that visualizes the internal structure of a material on the nanometer scale by applying a computed tomography method (CT method) to transmission electron microscopy (TEM). Utilizing that TEM is a technique for obtaining a transmission image of a sample with respect to an electron beam, the sample is inclined with respect to the electron beam, a large number of transmission images are taken, and a series of these inclined transmission images are reconstructed by the CT method. This is a technique for obtaining a three-dimensional image.

  An experimental technique for obtaining a three-dimensional image by TEMT is not particularly limited, but a representative example is given. Similar to the preparation of a sample for observation by a two-dimensional TEM, a sliced product (sample) of a thermoplastic resin composition is prepared by a known technique, and the sample is dyed or dyed with an appropriate staining agent. create. The sample is subjected to a three-dimensional electron microscope (for example, JEM-2200FS manufactured by JEOL). For example, the sample is tilted in steps of 1 ° within a tilt angle range of −60 ° to + 60 °, and a transmission image is displayed. Photograph and obtain 121 inclined transmission images. Before photographing an image, gold particles having a diameter of about 10 nm are placed on the surface of the sample, and the movement along with the inclination of the gold particles is tracked to correct the tilt axis of the transmitted image. Three-dimensional data is reconstructed from a series of inclined transmission images with respect to the inclination axis to obtain a three-dimensional transmission image.

  In the thermoplastic resin composition used in this embodiment, one of the thermoplastic resin (A) or the resin (B) having a reactive functional group forms a continuous phase and the other forms a dispersed phase. The resin constituting the continuous phase is either the thermoplastic resin (A) or the resin (B) having a reactive functional group, and is not particularly limited, but mainly requires the characteristics as the thermoplastic resin (A). If so, the continuous phase is preferably composed of the thermoplastic resin (A).

  In the thermoplastic resin composition used in the present embodiment, a three-dimensional connection structure Cs including a continuous phase component is formed in the dispersed phase. The three-dimensional connection structure here is a connection structure that is confirmed by a three-dimensional transmission image obtained by TEMT, and is not particularly limited as long as it is a structure in which particles are not three-dimensionally connected but three-dimensionally connected. There are no column shapes, T shapes, cross shapes, network shapes, and the like.

  In the thermoplastic resin composition used in the present embodiment, the proportion of the area of the connecting structure Cs in the cross section of the dispersed phase Dp having an average particle diameter of 1000 nm or less in the dispersed phase is 10% or more. The average particle diameter here can be calculated by image analysis of a transmission image at an inclination angle of 0 ° in TEMT. For image analysis, image analysis software such as “Scion Image” manufactured by Scion Corporation is used to calculate the average value of the diameter and minor axis of the dispersed phase present in the transmission image. The average particle diameter is calculated as the average value of the diameters.

  In the thermoplastic resin composition used in the present embodiment, the three-dimensional connection structure Cs including the continuous phase component in the dispersed phase is formed as follows. That is, when producing the thermoplastic resin composition used in the present embodiment, one of the thermoplastic resin (A) and the resin (B) having a reactive functional group forms a continuous phase and the other forms a dispersed phase. The thermoplastic resin (A) and the resin (B) having a reactive functional group react at the interface between the continuous phase and the dispersed phase. As the reaction at the interface proceeds, the amount of reactant increases, and the reactant generated at the interface is drawn into the dispersed phase. As the reaction further proceeds, the amount of reactants drawn into the dispersed phase increases, and the reactants are connected to each other to form a three-dimensional connection structure in the dispersed phase. Moreover, since the reaction product produced by the reaction at the interface acts as a surfactant, the dispersed phase becomes finer, and coalescence and coarsening of the dispersed phase are prevented to stabilize the dispersed state. In this way, the reaction between the thermoplastic resin (A) and the resin (B) having a reactive functional group proceeds to form a three-dimensional connection structure Cs containing a continuous phase component in the dispersed phase, and an average particle size. When the ratio of the area of the connected structure Cs in the cross section of the dispersed phase Dp of 1000 nm or less is 10% or more, the effect of the thermoplastic resin composition, that is, the unique viscoelastic behavior is remarkably exhibited. The impact energy absorption performance and vibration energy absorption performance during high-speed deformation are remarkably excellent.

  The ratio of the area of the connected structure Cs occupying the cross section of the dispersed phase Dp having an average particle diameter of 1000 nm or less is 10% or more. However, for the more remarkable expression of the unique viscoelastic behavior, the average particle diameter is preferably Is preferably 15% or more, and more preferably 20% or more, in the cross section of the dispersed phase Dp of 800 nm or less, more preferably 500 nm or less. The cross section of the disperse phase Dp here refers to a cross section in a transmission image at an inclination angle of 0 ° in TEMT. The method for calculating the ratio of the area of the connected structure Cs in the cross section of the dispersed phase Dp is not particularly limited, but an appropriate staining agent is used as the staining agent, and either the dispersed phase or the continuous phase is dyed and transmitted. By giving color contrast to the dispersed and continuous phases in the image, the dispersed and continuous phases can be distinguished. Therefore, the connected structure Cs including the continuous phase component can be similarly given a color contrast with the dispersed phase. The portion of the cross section of Dp in the dispersed phase that is different in color from the dispersed phase Dp can be defined as the cross section of the connection structure Cs including the continuous phase component. The value divided by the cross-sectional area of the phase Dp is the ratio of the area of the connection structure Cs in the cross section of the dispersed phase Dp. The area calculation method is not particularly limited, but can be calculated using image analysis software such as the image analysis software “Scion Image” manufactured by Scion Corporation.

  In the tensile test, the thermoplastic resin composition used in this embodiment is E (V1) when V1 <V2 when the tensile elastic modulus is E (V1) or E (V2) when the tensile speed is V1 or V2. > E (V2) is preferred. The tensile test in this case is performed according to a method specified in the standard. The tensile elastic modulus indicates the gradient of the initial straight line portion of the stress-strain curve.

  In the tensile test, the thermoplastic resin composition used in the present embodiment is ε (V1) and ε (V2) when the tensile rupture elongation is V1 and V2, and when V1 <V2, ε It is preferable that (V1) <ε (V2). The tensile elongation at break indicates the elongation at the moment of fracture. The above relational expression is preferably established for all V1 and V2 within the range of the tensile speed of 10 mm / min to 500 mm / min, and more preferably any V1 within the range of 1 mm / min to 1000 mm / min. , V2 is preferably established.

  As a method for producing the thermoplastic resin composition used in the present embodiment, production in a molten state, production in a solution state, etc. can be used, but production in a molten state can be preferably used from the viewpoint of improving reactivity. . For production in a molten state, melt kneading with an extruder, melt kneading with a kneader, or the like can be used. From the viewpoint of productivity, melt kneading with an extruder that can be continuously produced can be preferably used. For melt kneading by an extruder, one or more extruders such as a single screw extruder, a twin screw extruder, a multi screw extruder such as a four screw extruder, and a twin screw single screw compound extruder can be used. From the viewpoint of improvement in productivity, reactivity, and productivity, a multi-screw extruder such as a twin-screw extruder or a four-screw extruder can be preferably used, and a method by melt kneading using a twin-screw extruder is most preferable.

  When producing a thermoplastic resin composition used in the present embodiment, when using a twin screw extruder, there is no particular limitation, but from the viewpoint of improvement of kneadability and reactivity, the value of L / D0 is 50 or more. It is preferable that there is, more preferably 60 to 200, and even more preferably in the range of 80 to 200. The L / D0 is a value obtained by dividing the screw length L by the screw diameter D. The screw length is the length from the upstream end of the screw segment at the position (feed port) where the screw base material is supplied to the screw tip. Here, the screw of the twin screw extruder is configured by combining screw segments having different lengths and shape characteristics such as full flight and kneading disc. In the extruder, the side to which raw materials are supplied may be referred to as upstream, and the side from which molten resin is discharged may be referred to as downstream.

  When an extruder having a sampling valve or the like is used for sampling from the middle of the extruder, the screw length L is “upstream of the screw segment at the position (feed port) where the raw material of the screw is supplied. It can be considered that it is the same as that kneaded by a normal extruder equal to the “length from the end portion to the sampling location” and having a screw diameter D0 equal to the screw diameter of an extruder having a sampling valve or the like. The sampling location here refers to a position on the screw shaft on the upstream side closest to the port through which the resin in the cylinder is discharged.

  Further, when producing a thermoplastic resin composition used in the present embodiment, when using a twin screw extruder, from the viewpoint of improving kneadability and reactivity, the screw of the twin screw extruder is a full flight zone having a plurality of locations. And a kneading zone. The full flight zone is composed of one or more full flights, and the kneading zone is composed of one or more kneading discs.

  When producing a thermoplastic resin composition used in the present embodiment, when a twin screw extruder is used, the kneading zone that is the maximum of the resin pressures indicated by the resin pressure gauges installed in a plurality of kneading zones Pkmax (MPa), and the resin pressure in the minimum full flight zone among the resin pressures indicated by resin pressure gauges installed in multiple full flight zones is Pfmin (MPa), the value of Pkmax is It is preferable to produce the thermoplastic resin composition used in the present embodiment under the conditions of (Pfmin + 0.3) or more, more preferably (Pfmin + 0.4) or more, and (Pfmin + 0.5) or more. More preferably.

  A kneading zone composed of one or more kneading discs is more excellent in kneadability and reactivity of the molten resin than a full flight zone composed of one or more full flights. By filling the kneading zone with the molten resin, the kneading property and the reactivity are drastically improved. As an index indicating the state of filling of the molten resin, there is a value of the resin pressure, and the larger the resin pressure, the more standard the molten resin is filled. That is, in the production of the thermoplastic resin composition used in this embodiment, when using a twin screw extruder, the reaction is increased by increasing the resin pressure in the kneading zone within a certain range from the resin pressure in the full flight zone. It is possible to effectively promote the formation of a three-dimensional connection structure Cs including a continuous phase component in the dispersed phase, and to make a specific viscoelastic behavior remarkably exhibited. .

  There are no particular restrictions on how to increase the resin pressure in the kneading zone, but there is an effect of accumulating the reverse screw zone and the molten resin between the kneading zones and downstream of the kneading zone, which has the effect of pushing the molten resin upstream. For example, a method of introducing a seal ring zone having a gap is preferably used. The reverse screw zone and the seal ring zone are composed of one or more reverse screws and one or more seal rings, which can be combined.

  For example, when a reverse screw zone is introduced between kneading zones or downstream of the kneading zone, assuming that the length of each reverse screw zone is Lr, all the reverse screw zones have Lr / D0 = 0.1. It is preferable from a viewpoint of kneading | mixing property and reactivity that it has the length of -10. The length Lr / D0 of each reverse screw zone is more preferably 0.2 to 8, and further preferably 0.3 to 6. The length Lr of the reverse screw zone is defined as a perpendicular line from the upstream end portion of the most upstream reverse screw constituting the reverse screw zone to the screw shaft center line, and from the downstream end portion of the most downstream reverse screw to the screw shaft center. The distance between the perpendicular to the line.

  Further, when a twin screw extruder is used when producing the thermoplastic resin composition used in the present embodiment, the extrusion amount of the thermoplastic resin composition is preferably 0.01 kg / h or more per 1 rpm of the screw. More preferably 0.05 kg / h to 1 kg / h, still more preferably 0.08 to 0.5 kg / h, and most preferably 0.1 to 0.3 kg / h. The extrusion amount is an extrusion rate of the thermoplastic resin composition discharged from the extruder, and is a weight (kg) extruded per hour.

  In addition, the preferable numerical range regarding the extrusion amount in the said twin-screw extruder is based on the extrusion amount of a twin-screw extruder with a screw diameter of 37 mm. When the screw diameters are significantly different, for example when using a twin screw extruder with a diameter of less than 30 mm or more than 50 mm, the extrusion rate is preferably 2. It can be read as an increase / decrease according to the fifth power law or the third power law, more preferably according to the 2.5 power law.

  For example, when a twin screw extruder having a screw diameter of 20 mm is used, assuming that the extrusion amount conforms to the 2.5th power rule of the screw diameter ratio before and after the scale down, the extrusion amount of the thermoplastic resin composition is the number of screw rotations. Preferably, 0.002 kg / h or more per 1 rpm, more preferably 0.01 to 0.2 kg / h, still more preferably 0.017 to 0.11 kg / h, most preferably 0.02 to 0.06 kg / h. h.

  Further, when a twin screw extruder having a screw diameter of 100 mm is used, assuming that the extrusion amount conforms to the 2.5th power rule of the screw diameter ratio before and after the scale-up, the extrusion amount of the thermoplastic resin composition is per 1 rpm of the screw. It is preferably 0.12 kg / h or more, more preferably 0.6 to 12 kg / h, still more preferably 0.96 to 6 kg / h, and most preferably 1.2 to 3.6 kg / h.

  Moreover, there is no restriction | limiting in particular as a rotational speed of a screw, Usually, 10 rpm or more, Preferably it is 15 rpm or more, More preferably, it is 20 rpm or more. The extrusion rate is not particularly limited, but is usually 0.1 kg / h or more, preferably 0.15 kg / h or more, and more preferably 0.2 kg / h or more.

  Moreover, when manufacturing the thermoplastic resin composition used in this embodiment, when using a twin screw extruder, the residence time in the twin screw extruder of the thermoplastic resin composition is 1 to 30 minutes. Preferably, it is 1.5 to 28 minutes, more preferably 2 to 25 minutes. The residence time is an average of the residence time from when the raw material is supplied to the twin screw extruder until it is discharged, and is a steady melt kneading in which the uncolored thermoplastic resin composition is adjusted to a predetermined extrusion amount. In the state, from the position of the screw base to which the raw material is supplied, together with the raw material, usually about 1 g of the colorant is added, and from the time when the colorant is added, the thermoplastic resin composition is extruded from the discharge port of the extruder, The time until the point at which the degree of coloring by the colorant on the extrudate is maximized is taken.

  Further, when a twin screw extruder is used when producing the thermoplastic resin composition used in the present embodiment, the screw of the twin screw extruder is not particularly limited, and is a complete mesh type, an incomplete mesh type, a non-mesh type, Although a mesh type screw can be used, a complete mesh type screw is preferable from the viewpoint of kneading and reactivity. Further, the direction of rotation of the screw may be either the same direction or a different direction, but from the viewpoint of kneadability and reactivity, the same direction is preferable. When a twin screw extruder is used in this embodiment, the screw is most preferably a co-rotating fully meshed type.

  In the present embodiment, when a twin screw extruder is used, the screw configuration of the twin screw extruder is a combination of full flight and / or kneading disks. A screw configuration that effectively provides a shear field is preferred. Therefore, as described above, it is preferable that the screw of the twin-screw extruder has a plurality of kneading zones composed of one or more kneading disks in the longitudinal direction, and the total of these kneading zones The length is preferably in the range of 5 to 50%, more preferably 10 to 40%, and still more preferably 15 to 30% of the total length of the screw.

In this embodiment, when using a twin screw extruder, if the length of each kneading zone in the screw of the twin screw extruder is Lk, all the kneading zones are Lk / D0 = 0.2. It is preferable from a viewpoint of kneading | mixing property and reactivity that it has the length of -10. The length Lk / D0 of each kneading zone is more preferably 0.3 to 9, and further preferably 0.5 to 8. The length Lk of the kneading zone is determined by the perpendicular line from the upstream end of the most upstream kneading disk constituting the kneading zone to the screw shaft center line and the screw from the downstream end of the most downstream kneading disk. The distance between the vertical line to the axis center line.
Moreover, in this embodiment, when using a twin-screw extruder, it is preferable that the kneading zone of a twin-screw extruder is arrange | positioned over the whole region, without uneven distribution in the specific position in a screw.

  In the thermoplastic resin composition used by this embodiment, you may add other components other than said (A) and (B) as needed. Examples of other components include fillers, thermoplastic resins, rubbers, and various additives.

  For example, a filler may be used as necessary to improve strength, dimensional stability, and the like. The filler may be fibrous or non-fibrous, or a combination of fibrous filler and non-fibrous filler may be used.

  Examples of the filler include glass fiber, glass milled fiber, carbon fiber, potassium titanate whisker, zinc oxide whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, stone-kow fiber, metal Fibrous fillers such as fibers, wollastonite, zeolite, sericite, kaolin, mica, clay, pyrophyllite, bentonite, asbestos, talc, alumina silicate and other silicates, alumina, silicon oxide, magnesium oxide, zirconium oxide, Metal compounds such as titanium oxide and iron oxide, carbonates such as calcium carbonate, magnesium carbonate and dolomite, sulfates such as calcium sulfate and barium sulfate, hydroxides such as magnesium hydroxide, calcium hydroxide and aluminum hydroxide, Rasubizu, ceramic beads, non-fibrous fillers such as boron nitride and silicon carbide and the like, which may be hollow, it is also possible to further combination of these fillers 2 or more. In addition, these fibrous and / or non-fibrous fillers are pretreated with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound, an epoxy compound, It is preferable in terms of obtaining superior mechanical strength.

  In order to improve strength, dimensional stability and the like, when such a filler is used, the amount of the filler is not particularly limited, but it is preferably 30 to 400 parts by weight based on 100 parts by weight of the thermoplastic resin composition.

Furthermore, in the thermoplastic resin composition used in the present embodiment, other rubbers and various additives can be blended as necessary within the range not impairing the characteristics.
Such rubbers include, for example, polybutadiene, polyisoprene, styrene-butadiene random copolymers and block copolymers, hydrogenated products of the block copolymers, acrylonitrile-butadiene copolymers, butadiene-isoprene copolymers, and the like. Diene rubber, ethylene-propylene random copolymer and block copolymer, ethylene-butene random copolymer and block copolymer, ethylene and α-olefin copolymer, ethylene-acrylic acid, ethylene -Ethylene-unsaturated carboxylic acid copolymer such as methacrylic acid, ethylene-acrylic acid ester, ethylene-unsaturated carboxylic acid ester copolymer such as ethylene-methacrylic acid ester, part of unsaturated carboxylic acid is a metal salt A ethylene-acrylic acid-acrylic acid metal , Ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymer such as ethylene-methacrylic acid-methacrylic acid metal salt, acrylic ester-butadiene copolymer such as butyl acrylate-butadiene copolymer Ethylene-propylene non-conjugated diene terpolymers such as elastic polymers, ethylene-fatty acid vinyl copolymers such as ethylene-vinyl acetate, ethylene-propylene-ethylidene norbornene copolymers, ethylene-propylene-hexadiene copolymers Preferred examples thereof include thermoplastic elastomers such as coalescence, butylene-isoprene copolymer, chlorinated polyethylene, polyamide elastomer, and polyester elastomer, and modified products thereof. Two or more kinds of such rubbers can be used in combination. When such rubbers are used, the blending amount thereof is not particularly limited, but is preferably blended by 1 to 400 parts by weight with respect to 100 parts by weight of the thermoplastic resin composition.

  The various additives that can be added to the thermoplastic resin composition used in the present embodiment are preferably crystal nucleating agents, anti-coloring agents, antioxidants such as hindered phenols, hindered amines, ethylene bisstearyl amide, Examples include mold release agents such as higher fatty acid esters, plasticizers, heat stabilizers, lubricants, UV inhibitors, colorants, flame retardants, and foaming agents.

  The rubbers and various additives can be blended at any stage for producing the thermoplastic resin composition used in the present embodiment. For example, the thermoplastic resin used in the present embodiment by a twin screw extruder. When manufacturing the composition, a method of adding the resin at the same time, a method of adding the resin by means of side feed during melt kneading, a method of adding the resin after melt kneading in advance, A method of adding the remaining resin to one resin constituting the thermoplastic resin composition, melt-kneading, and the like.

  When the thermoplastic resin composition used in the present embodiment is produced by a twin screw extruder, a supercritical fluid can be introduced from the viewpoint of improving reactivity when melt kneading with the twin screw extruder. Such a supercritical fluid is a fluid that exceeds the limit point (critical point) at which gas and liquid can coexist, and has both gas properties (diffusibility) and liquid properties (solubility). is there. Such supercritical fluids include supercritical carbon dioxide, supercritical nitrogen, supercritical water, etc., preferably supercritical carbon dioxide and supercritical nitrogen can be used, most preferably supercritical carbon dioxide can be used. .

The armrest main body 20 used in the present embodiment is obtained by molding the above-described thermoplastic resin composition into a predetermined shape.
A molded product of the thermoplastic resin composition used in this embodiment (referred to as a molded product) has the same rigidity as that of a general thermoplastic resin molded product during normal use, but the tensile speed is changed. When the temperature rises or when the temperature rises, the characteristics shown in FIGS. 4 and 5 are obtained.

  The graph shown in FIG. 4 shows the stress and elongation (tensile elongation at break) applied to the molded product when the tensile speed of the molded product of the thermoplastic resin composition used in the present embodiment is changed (in the case of high speed and low speed). Shows the relationship.

In a molded body made of a general thermoplastic resin, the higher the tensile speed, the higher the tensile elastic modulus and the lower the tensile elongation. In contrast, the molded article of the thermoplastic resin composition used in the present embodiment exhibits a unique viscoelastic property that the tensile modulus decreases as the tensile speed increases, and further, the tensile elongation at break (elongation). Shows exactly the opposite characteristic of increasing.
This characteristic is also apparent from FIG. 4. When the tensile rate is high, the molded body of the thermoplastic resin composition used in the present embodiment is easily stretched even if the stress applied to the molded body is small.

  In the present embodiment, the fastening portion 26 of the armrest body 20 is pulled at a higher speed in a side collision of the vehicle than in normal use, so when a vehicle including the door trim 10 of the present embodiment has a side collision, Even if the stress applied to the fastening part 26 is small, the fastening part 26 and the fastening part side wall 23A are easily stretched, and the armrest body 20 is easily deformed.

FIG. 5 is a graph showing the relationship between the temperature of the molded article of the thermoplastic resin composition used in this embodiment and the rate of decrease in elastic modulus. From the graph of FIG. 5, when the resin contained in the thermoplastic resin composition used in the present embodiment is a polyamide resin, the elastic modulus of the molded body rapidly decreases when the temperature of the molded body exceeds 40 ° C. Recognize.
Note that the data measurement for creating the graphs of FIGS. 4 and 5 was performed by using an autograph AG100kNG (manufactured by Shimadzu Corporation) and performing a tensile test at a predetermined speed with a distance between chucks of 50 mm. In FIG. 4, the tensile test was carried out at a tensile speed of 100 mm / min (low speed) and 1000 mm / min (high speed). In FIG. 5, the tensile elastic modulus was measured at a tensile speed of 1000 mm / min, and the rate of decrease in elastic modulus at 40 ° C., 50 ° C., 60 ° C., and 80 ° C. was calculated based on the tensile elastic modulus at 23 ° C.

  When a passenger collides with the armrest body 20 due to a secondary collision at the time of a side collision of a vehicle including the door trim 10 of the present embodiment, stress concentrates on a fastening portion to which the trim board 11 of the armrest body 20 is fastened. When such a situation occurs, the stress concentrated on the fastening portion is converted into thermal energy, and the temperature of the fastening portion tends to be high (40 ° C. or higher). As described above, when the resin contained in the thermoplastic resin composition used in the present embodiment is a polyamide resin, the elastic modulus of the molded body rapidly decreases when the temperature of the molded body exceeds 40 ° C. As a result, the elastic modulus of the fastening portion is abruptly lowered due to a secondary collision at the time of a side collision of the vehicle, and the armrest body 20 is easily deformed.

Next, functions and effects of this embodiment will be described.
6 is a cross-sectional view of the armrest body 20 during normal use, and FIG. 7 is a top view of the flange portion 21 during normal use. FIG. 8 is a cross-sectional view of the armrest body 20 at the time of side collision, and FIG. 9 is a top view of the flange portion 21 at the time of side collision.

  When a vehicle including the door trim 10 according to the present embodiment interferes with the occupant and the armrest body 20 due to a secondary collision at the time of a side collision, stress concentrates on the fastening portion 26 to which the trim board 11 of the armrest body 20 is fastened, thereby causing a shearing force. Work. In this embodiment, since the gap 27 is formed between the fastening portion 26 and the flange surface 21A and between the fastening portion side wall 23A and the flange surface 21A, the fastening portion side wall 23A is easily stretched. . As a result, according to this embodiment, the armrest body 20 is easily deformed by the fastening portion side wall 23 </ b> A expanding and contracting between the first connection wall 24 and the second connection wall 25 to absorb the impact. .

In particular, in the present embodiment, the material of the armrest body 20 has sufficient rigidity during normal use. However, if the tensile speed is increased, the armrest body 20 is easily stretched even with a small stress. Since the thermoplastic resin composition having the characteristic that the rate rapidly decreases is used, as shown in FIGS. 7 and 9, the fastening portion side wall 23 </ b> A easily extends during a side collision, and the armrest main body 20 becomes the trim board 11. The armrest body 20 is easily deformed by moving in a direction away from the right side (the right side in the figure).
Therefore, according to the present embodiment, the armrest body 20 is easily deformed at the time of a side collision, so that it is not necessary to reduce the thickness of the attachment portion of the armrest body 20 to the trim board 11. As a result, according to the present embodiment, the armrest body 20 (armrest 13) can be easily deformed during a side collision of the vehicle to reduce the impact on the occupant while ensuring rigidity as an armrest during normal use. The door trim 10 for vehicles provided with this can be provided.

  Further, according to the present embodiment, the trim board 11 is reinforced from the outside of the vehicle, and the first connecting wall 24B having a function of positioning the trim board 11 and the fastening portion side wall 23A that absorbs the impact at the time of a side collision are provided. Since the first connecting walls 24A forming the continuous fastening portions 26 are alternately provided, the armrest body 20 can be quickly deformed at the time of a side collision while ensuring the strength during normal use. it can.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the first connection wall in which the fastening portion is formed and the first connection wall in which the fastening portion is not formed are alternately provided. However, all the first connection walls are shown. Fastening portions may be provided on the first connecting wall, or the number of first connecting walls on which the fastening portions are formed may be reduced.

  (2) In the above embodiment, a thermoplastic resin composition that has sufficient rigidity as a material constituting the entire armrest body during normal use but has a characteristic that the tensile elastic modulus is reduced when deformed at high speed. Although the thing was used, you may use the said thermoplastic resin composition as a material for comprising a fastening part and a fastening part side wall.

DESCRIPTION OF SYMBOLS 10 ... Door trim 11 ... Trim board 13 ... Armrest 16 ... Opening part 17 ... Opening edge
DESCRIPTION OF SYMBOLS 20 ... Armrest main body 21 ... Flange part 21A ... Flange surface 23, 23A, 23B ... Side wall 24, 24A, 24B ... 1st connection wall 25 ... 2nd connection wall 26 ... Fastening part 27 ... Gap

Claims (3)

A vehicle door trim comprising a trim board disposed in a vehicle interior and having an opening for attaching an armrest; and an armrest attached to the opening of the trim board,
On the periphery of the armrest, which is arranged at the opening edge of the opening of the trim board, a flange portion is formed to project outward in the passenger compartment direction.
A plurality of side walls extending from the vehicle interior side to the vehicle exterior side direction are provided at intervals in the length direction of the flange portion on the flange surface of the flange portion that is continuous with the surface disposed on the vehicle interior side of the armrest. A first connecting wall that continues from the end of the side wall on the vehicle interior side and that connects to the end of the side wall on the side of the vehicle interior; and A plurality of second connection walls that are continuous with the end portion outside the passenger compartment are provided alternately,
Of the plurality of first connection walls, all or a part of the first connection walls is provided with a fastening portion for fastening the armrest to the outer side surface of the trim board, and the fastening portion is provided. In addition, gaps are formed between the first connecting wall and the flange surface, and between the flange surface and the side wall connected to the first connecting wall provided with the fastening portion, respectively. Vehicle door trim. Among the armrests, at least the fastening part and the side wall connected to the first connecting wall provided with the fastening part are composed of a thermoplastic resin composition,
The thermoplastic resin composition is obtained by blending a thermoplastic resin (A) and a resin (B) having a reactive functional group. In the morphology of the resin composition observed by a transmission electron tomography method, ( One of A) and (B) forms a continuous phase, the other forms a dispersed phase, and a three-dimensional connection structure Cs containing the continuous phase component is formed in the dispersed phase, and the dispersed phase 2. The vehicle door trim according to claim 1, wherein an area ratio of the connection structure Cs in a cross section of the dispersed phase Dp having an average particle diameter of 1000 nm or less is 10% or more. Among the armrests, at least the fastening part and the side wall connected to the first connecting wall provided with the fastening part are composed of a thermoplastic resin composition,
The thermoplastic resin composition is formed by blending a thermoplastic resin (A) and a resin (B) having a reactive functional group. In a tensile test of a molded article of the thermoplastic resin composition, the following (I) and 3. The vehicle door trim according to claim 1, wherein the relationship of (II) is satisfied. 4.
(I) Assuming that the tensile elastic moduli at the tensile speeds V1 and V2 are E (V1) and E (V2), respectively, when V1 <V2, E (V1)> E (V2)
(II) Assuming that the tensile breaking elongation at the tensile speeds V1 and V2 is ε (V1) and ε (V2), when V1 <V2, ε (V1) <ε (V2)

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