JP2008007704A - Composition for foam-filling, foam-filling member and foam for filling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition for foam-filling, which can simply be formed and set, can ensure good foaming and simultaneously reduce sagging, when foamed, to provide a foam-filling member using the composition for foam-filling, and to provide a foam for filling, obtained by foaming the composition for foam-filling. <P>SOLUTION: This composition for foam-filling comprises a polymer comprising a styrenic thermoplastic elastomer and styrene/butadiene rubber, a foaming agent, and a cross-linking agent, and has a melt viscosity of ≥7,000 Pa s at 100°C and a foaming ratio of ≥10. A foam-filling member 5 is produced by forming the composition for the foam-filling in a sheet-like shape to form a resin layer 7, and then adhering a sheet-like adhesive layer 6 to the resin layer 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filling foam used for filling between various members, an internal space of a hollow member, and the like, and a foam filling member and a foam filling composition for forming the filling foam. .

Conventionally, a hollow member formed as a closed cross section of an automobile pillar or the like has a foam as a filler in order to prevent engine vibration and noise or wind noise from being transmitted to the passenger compartment. It is known to fill.
In order to fill the foam into the hollow member, usually, a foamable material for forming the foam is first fixed on the inner wall surface of the hollow member, and then the fixed foamable material is foamed.

  In such a filling, when filling the hollow member arranged in the vertical direction with the foam, it is necessary to foam after fixing the foamable material on the inner wall surface arranged in the vertical direction in the hollow member. Therefore, the foamable material softens in the middle of foaming and foams while dripping downward. If it does so, it will become easy to generate | occur | produce an unfilled part (space | gap) upward from the fixed position of a foamable material, and also a foamable material may fall out from an inner wall surface in the middle of foaming.

Therefore, for example, in a gap filling material that expands and fills a void surrounded by a wall of a hollow body formed by overlapping, a plate-like portion formed along the wall faces the plate-like portion. A protrusion projecting to the wall until it comes into contact with the wall, and the plate-shaped part and the projecting part are integrally formed of foamed resin, and the hollow body is formed by overlapping In addition, there has been proposed a gap filler in which protruding portions are formed at positions that do not get in the way (see, for example, Patent Document 1). In this void filler, the protruding portion that protrudes until contacting the wall is adhered to the wall at the time of foaming, so that the void filler does not sag and the void can be filled.
JP 2005-153715 A

However, in the gap filler described in Patent Document 1, the plate-like portion and the protruding portion must be formed integrally from the foamed resin, and the shape is limited and complicated. There is a problem that it takes time and cost.
In addition, when this void filler is installed on the wall of the hollow body, the plate-like portion is arranged along the wall, and when the hollow body is overlapped and formed, the protruding portion is positioned so as not to interfere. There is a problem that it is necessary to dispose and the installation location is limited and the installation takes time.

  An object of the present invention is to provide a foam filling composition that can be easily formed and easily installed, and can reduce sagging during foaming while ensuring good foaming, and the foam filling composition. An object of the present invention is to provide a foam filling member to be used, and a foam for filling obtained by foaming the foam filling member.

In order to achieve the above object, the foam filling composition of the present invention contains a polymer, a foaming agent and a crosslinking agent, has a melt viscosity at 100 ° C. of 7000 Pa · s or more, and a foaming ratio of 10 times or more. It is characterized by.
In the foam filling composition of the present invention, it is preferable to contain 5 parts by weight or more of the foaming agent with respect to 100 parts by weight of the foam filling composition.

In the foam filling composition of the present invention, it is preferable that the polymer contains a styrene thermoplastic elastomer and a styrene-butadiene rubber.
In the foam filling composition of the present invention, it is preferable that the styrene-butadiene rubber is contained in a proportion of 70 parts by weight or less with respect to 100 parts by weight of the styrene-based thermoplastic elastomer.

In the foam filling composition of the present invention, it is preferable that the styrene thermoplastic elastomer has a weight average molecular weight of 130,000 or more.
Moreover, the foam filling member of the present invention includes a resin layer made of the above-described foam filling composition, and an adhesive layer on which the resin layer is laminated and the resin layer is fixed to the member to be filled. It is characterized by.

  Furthermore, the foam for filling of the present invention is characterized by being obtained by foaming the above-mentioned foam filling composition.

The foam filling composition of the present invention contains a polymer, a foaming agent and a crosslinking agent, has a melt viscosity at 100 ° C. of 7000 Pa · s or more, and a foaming ratio of 10 times or more. Therefore, sagging due to softening during foaming can be reduced while ensuring good foaming. Therefore, even if it is fixed to a vertical surface and foamed, it can be filled without a gap.
Moreover, this foam filling composition ensures good foaming and reduction of sagging due to its own composition. Therefore, it can be formed into a simple and free shape, and can be easily and freely installed.

Therefore, the foam filling member of the present invention in which the composition for foam filling of the present invention is used can be manufactured in a low-cost and free shape, and simply by sticking the adhesive layer to the member to be filled. In addition, it can be fixed at a free place.
Furthermore, the foam for filling of the present invention obtained by foaming the foam filling composition of the present invention can fill between the various members and the internal space of the hollow member without gaps.

The foam filling composition of the present invention contains a polymer, a foaming agent and a crosslinking agent.
In the present invention, the polymer is not particularly limited, and examples thereof include thermoplastic elastomers and rubbers.
The thermoplastic elastomer is not particularly limited. For example, styrene thermoplastic elastomer, olefin thermoplastic elastomer, urethane thermoplastic elastomer, polyester thermoplastic elastomer, polyamide thermoplastic elastomer, 1,2-polybutadiene heat Examples thereof include a plastic elastomer and a vinyl chloride thermoplastic elastomer. Preferably, a styrenic thermoplastic elastomer is used.

  The styrenic thermoplastic elastomer is a styrene block copolymer having a polystyrene block (hard segment) and a rubber intermediate block (soft segment), and is linear (linear) type or radial (radial) depending on the arrangement state of the polystyrene block. It is classified into types. The rubber intermediate block is selected from, for example, polybutadiene, polyisoprene or polyolefin (ethylene butylene).

More specifically, examples of the styrenic thermoplastic elastomer include styrene / butadiene / styrene block copolymer (SBS), styrene / isoprene / styrene block copolymer, and styrene / ethylene / butylene / styrene block copolymer.
The styrenic thermoplastic elastomer has a Brookfield viscosity (BF viscosity: 25 ° C., 77 F) measured by a B-type viscometer of 2000 mPa · s or more, preferably 3000 mPa · s or more, more preferably 4000 mPa · s or more. Moreover, it is 20000 mPa * s or less, Preferably, it is 10000 mPa * s or less. Further, the melt flow rate (MFR: 200 ° C., 5 kg load, JIS K 7210 (1999)) is 5 g / 10 min or less, preferably 1 g / 10 min or less.

  The styrene thermoplastic elastomer has a weight average molecular weight (Mw) of 50000 or more, preferably 130,000 or more, and 1 million or less, preferably 500,000 or less. When the weight average molecular weight (Mw) is 130,000 or more, the sagging property when attached to a vertical surface is good. In addition, a weight average molecular weight (Mw) is calculated as a polystyrene conversion value by GPC.

  Further, the rubber is not particularly limited. For example, aromatic rubber such as styrene-butadiene rubber (SBR), for example, butadiene rubber (1,4-polybutadiene rubber), syndiotactic-1,2-polybutadiene rubber, Non-aromatic rubbers such as acrylonitrile-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, isoprene rubber, natural rubber and the like can be mentioned. An aromatic rubber is preferable, and a styrene-butadiene rubber is more preferable.

The styrene-butadiene rubber has a Mooney viscosity (JIS K 6300-1 (2001)) of, for example, 50 (ML1 + 4, at100 ° C.) or more, preferably 70 (ML1 + 4, at100 ° C.) or more, and 150 (ML1 + 4, at100 ° C.) or less, preferably 100 (ML1 + 4, at100 ° C.) or less.
Further, the above-described polymers may be used alone or in combination. Preferably, a thermoplastic elastomer and rubber are used in combination, and more preferably, a styrene thermoplastic elastomer and styrene / butadiene rubber are used in combination. When these are used in combination, good foamability is ensured by the thermoplastic elastomer, and dripping during foaming can be reduced by rubber. When these are used in combination, the blending ratio of the rubber is, for example, 70 parts by weight or less, preferably 60 parts by weight or less, more preferably 50 parts by weight or less, relative to 100 parts by weight of the thermoplastic elastomer. Moreover, it is 10 weight part or more, Preferably, it is 25 weight part or more.

The blending ratio of the polymer is, for example, 10 to 80 parts by weight, preferably 20 to 60 parts by weight with respect to 100 parts by weight of the foam filling composition.
In the present invention, the foaming agent is not particularly limited, and examples thereof include inorganic foaming agents and organic foaming agents. Examples of the inorganic foaming agent include ammonium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, azides and the like.

  Examples of organic foaming agents include N-nitroso compounds (N, N′-dinitrosopentamethylenetetramine, N, N′-dimethyl-N, N′-dinitrosotephthalamide, etc.), azo compounds, and the like. (Eg, azobisisobutyronitrile, azodicarbonamide, barium azodicarboxylate, etc.), fluorinated alkanes (eg, trichloromonofluoromethane, dichloromonofluoromethane, etc.), sulfonyl hydrazine compounds (eg, p-toluenesulfonyl) Hydrazide, diphenylsulfone-3,3′-disulfonylhydrazide, 4,4′-oxybis (benzenesulfonylhydrazide), allylbis (sulfonylhydrazide) and the like, sulfonyl semicarbazide compounds (for example, p-toluylenesulfonyl semicarbazide) , 4,4'-like oxybis (benzenesulfonyl semicarbazide)), triazole compound (e.g., 5-morpholyl-1,2,3,4-thiatriazole, etc.) and the like.

  As the foaming agent, a heat-expandable compound (for example, isobutane, pentane, etc.) is enclosed in a microcapsule (for example, a microcapsule made of a thermoplastic resin such as vinylidene chloride, acrylonitrile, acrylic acid ester, methacrylic acid ester). In addition, heat-expandable fine particles are also included. Examples of such thermally expandable fine particles include microspheres (trade name, manufactured by Matsumoto Yushi Co., Ltd.) as commercially available products.

These foaming agents may be used alone or in combination.
Of these foaming agents, azo compounds and sulfonyl hydrazide compounds are preferable. If an azo compound or a sulfonyl hydrazide compound is used, since the foaming gas is nitrogen gas, the polymer has low permeability and high foaming can be realized. More preferable examples include azodicarbonamide and 4,4′-oxybis (benzenesulfonylhydrazide). If these are used, since there is no mutagenesis, harmfulness to the human body can be reduced, and the amount of gas generated per unit weight can be increased.

The blending ratio of the foaming agent is, for example, 5 to 40 parts by weight, preferably 10 to 30 parts by weight with respect to 100 parts by weight of the polymer, and with respect to 100 parts by weight of the foam filling composition. For example, 5 parts by weight or more, preferably 5 to 20 parts by weight, and more preferably 7 to 15 parts by weight.
When the blending ratio of the foaming agent is 5 parts by weight or more with respect to 100 parts by weight of the foam filling composition, an expansion ratio of 10 times or more can be easily achieved. Moreover, even if the compounding quantity of a foaming agent exceeds the said range, the foaming ratio corresponding to a compounding ratio will not be obtained, but a cost demerit may be produced.

  Moreover, a foaming adjuvant can be used together with a foaming agent as needed. Examples of foaming aids include urea compounds, salicylic acid compounds, benzoic acid compounds, and zinc stearate. These foaming aids may be used alone or in combination. Of these foaming aids, urea compounds are preferable. The blending ratio of the foaming aid is, for example, 2 to 30 parts by weight, preferably 5 to 25 parts by weight with respect to 100 parts by weight of the polymer, and also with respect to 100 parts by weight of the foam filling composition. For example, 0.1 to 15 parts by weight, preferably 1 to 10 parts by weight.

  In the present invention, the crosslinking agent is not particularly limited. For example, sulfur (powder sulfur, insoluble sulfur), sulfur compounds, selenium, magnesium oxide, lead monoxide, organic peroxides (for example, dicumyl peroxide, 1,1-ditertiarybutylperoxy-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-ditertiarybutylperoxyhexane, 2,5-dimethyl-2,5-ditertiarybutylperper Oxyhexyne, 1,3-bis (tertiarybutylperoxyisopropyl) benzene, tertiarybutylperoxyketone, tertiarybutylperoxybenzoate), polyamines, oximes (for example, p-quinonedioxime, p, p'-dibenzoylquinone dioxime, etc.), nitroso compounds (eg p-dinitro) Benzene, etc.), resins (e.g., alkylphenol - formaldehyde resin, melamine - formaldehyde condensate, etc.), ammonium salts (e.g., ammonium benzoate), and the like.

These crosslinking agents may be used alone or in combination. Of these crosslinking agents, sulfur is preferably used in consideration of curability and reinforcing properties.
Further, the blending ratio of the crosslinking agent is, for example, 1 to 20 parts by weight, preferably 2 to 15 parts by weight, with respect to 100 parts by weight of the polymer, and with respect to 100 parts by weight of the foam filling composition, For example, 0.1 to 10 parts by weight, preferably 1 to 5 parts by weight. When the blending ratio of the crosslinking agent is less than the above range, the reinforcing property may be lowered. On the other hand, when it is more than the above range, the adhesive property may be lowered, which may be disadvantageous in cost.

  Moreover, a crosslinking accelerator can be used together with a crosslinking agent if necessary. Examples of the crosslinking agent accelerator include sulfides (for example, monothiurams such as tetramethylthiuram monosulfide, for example, disulfides such as tetramethylthiuram disulfide, tetrabutylthiuram disulfide, and di-2-benzothiazolyl disulfide. Dithiocarbamic acids, thiazoles, guanidines, sulfenamides, thiurams, xanthogenic acids, aldehyde ammonias, aldehyde amines, thioureas, zinc oxide and the like. These crosslinking accelerators may be used alone or in combination.

Of these crosslinking accelerators, sulfides are preferable. Further, among the sulfides, if tetrabutyl thiuram disulfide is contained, the crosslinking rate can be optimized. Therefore, it is possible to prevent outgassing due to the crosslinking speed becoming too slow and increase of closed cells due to the crosslinking speed becoming too fast.
The blending ratio of the crosslinking accelerator is, for example, 1 to 20 parts by weight, preferably 2 to 15 parts by weight with respect to 100 parts by weight of the polymer, and with respect to 100 parts by weight of the foam filling composition, for example. 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight.

In the present invention, the foam filling composition may include, for example, a filler, a tackifier, a softener, and further, for example, a processing aid, a thixotropic agent, a pigment, a scorch inhibitor, Known additives such as stabilizers, antioxidants, antioxidants, ultraviolet absorbers, colorants, fungicides, and flame retardants may be appropriately selected and contained.
The filler is not particularly limited. For example, calcium carbonate, aluminum hydroxide, magnesium carbonate, magnesium hydroxide, calcium oxide, silicic acid and its salts, mica, clay, talc, mica powder, bentonite, silica, glass beads Glass balloon, shirasu balloon, alumina, aluminum silicate, aluminum powder, carbon black, acetylene black and the like.

  These fillers may be used alone or in combination. Of these fillers, calcium carbonate and carbon black are preferable. The blending ratio of the filler is, for example, 20 to 200 parts by weight, preferably 40 to 120 parts by weight with respect to 100 parts by weight of the polymer, and with respect to 100 parts by weight of the foam filling composition, for example, 10 to 90 parts by weight, preferably 15 to 45 parts by weight.

Although it does not restrict | limit especially as a tackifier, For example, rosin resin, terpene resin (for example, terpene-aromatic liquid resin etc.), coumarone indene resin, petroleum resin (for example, C5 petroleum resin, C5 / C9 petroleum resin, etc.).
These tackifiers may be used alone or in combination. Of these tackifiers, a petroleum resin is preferable. The blending ratio of the tackifier is, for example, 1 to 20 parts by weight, preferably 2 to 15 parts by weight with respect to 100 parts by weight of the polymer, and with respect to 100 parts by weight of the foam filling composition, for example. 1 to 10 parts by weight, preferably 2 to 6 parts by weight.

The softening agent is not particularly limited, and examples thereof include phthalic acid oil, paraffin oil, naphthenic oil, fatty acid oil, and phosphoric acid oil.
These softeners may be used alone or in combination. Of these softeners, phthalic acid oil and paraffin oil are preferable. The blending ratio of the softening agent is, for example, 10 to 150 parts by weight, preferably 30 to 120 parts by weight with respect to 100 parts by weight of the polymer, and for example with respect to 100 parts by weight of the foam filling composition, 10 to 50 parts by weight, preferably 15 to 25 parts by weight.

The foam filling composition of the present invention is prepared by blending the above-described components in the above-described blending ratio, and is not particularly limited. For example, by a mixing roll, a pressure kneader, a Banbury mixer, a sigma blade, an extruder, etc. The mixture is kneaded under a temperature condition in which the foaming agent is hardly decomposed to prepare a kneaded product.
More specifically, for example, a foaming agent, a foaming accelerator, a crosslinking agent, and a crosslinking accelerator are used as final batch components, and the other components are used as master batch components. Next, the obtained master batch and final batch components are kneaded to obtain a kneaded product of the foam filling composition.

  Thus, the foam filling composition obtained as a kneaded product has a melt viscosity at 100 ° C. of 7000 Pa · s or higher, preferably 10,000 Pa · s or higher, and 100,000 Pa · s or lower, preferably 50000 Pa · s. It is prescribed below. In order to formulate such that the melt viscosity at 100 ° C. falls within the above range, the above-described components are appropriately blended at the blending ratio described above.

If the melt viscosity at 100 ° C. of the foam filling composition is less than 7000 Pa · s, when the foam filling is fixed to the vertical surface and foamed, dripping occurs during foaming of the foam filling composition. When the melt viscosity at 100 ° C. of the foam filling composition is 7000 Pa · s or more, the foam filling composition can be foamed in the horizontal direction when it is fixed on the vertical surface and foamed.
More specifically, the melt viscosity at 100 ° C. can be measured by the method shown in Examples described later.

Further, the foam filling composition obtained as a kneaded product has an expansion ratio of 10 times or more, preferably 12 times or more, and 30 times or less, preferably 25 times or less when foaming.
When the expansion ratio of the foam filling composition is less than 10 times, good foamability cannot be obtained, resulting in insufficient filling.
The foam filling member of the present invention includes a resin layer composed of the above-described foam filling composition, and an adhesive layer on which the resin layer is laminated and the resin layer is fixed to the member to be filled.

In the foam filling member of the present invention, the resin layer is not particularly limited to the above-mentioned kneaded product, but under a temperature condition where the foaming agent is not substantially decomposed, for example, by calender molding, extrusion molding, press molding, etc. It can be formed by rolling into a shape.
In addition, the thickness of a resin layer is 0.5-20 mm, for example, Preferably, it is 1.0-10 mm.

In the foam filling member of the present invention, the pressure-sensitive adhesive layer is not particularly limited. For example, a known pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a rubber pressure-sensitive adhesive is used in the same manner as described above, for example, calendar molding, extrusion molding, press It can be formed by rolling into a sheet shape by molding or the like.
Moreover, the thickness of the adhesion layer is 0.1-3.0 mm, for example, Preferably, it is 0.3-2.0 mm.

  And the foam filling member of this invention can be obtained by bonding together and laminating | stacking an above-described resin layer and the adhesion layer. The bonding of the resin layer and the adhesive layer is not particularly limited. For example, the kneaded product made of the foam filling composition is continuously extruded by an extruder to form the resin layer continuously, and the adhesive. Is continuously extruded by an extruder to form an adhesive layer continuously, and then the resin layer and the adhesive layer are overlapped and continuously pressed by a calender roll. In addition, the foam filling member obtained by this is cut | judged to appropriate length.

In addition, the obtained foam filling member has a separator (release paper) on the surface of the pressure-sensitive adhesive layer (the surface opposite to the back surface on which the resin layer is laminated) until it is actually used. Can also be attached.
The foam filling member of the present invention thus obtained can give various filling effects such as reinforcement, vibration control, soundproofing, dustproofing, heat insulation, buffering, watertightness, etc. to various members. Suitable as a filler for various industrial products such as reinforcing materials, vibration-proof materials, sound-proof materials, dust-proof materials, heat-insulating materials, shock-absorbing materials, water-stopping materials, etc. Can be used.

  In particular, the composition for foam filling obtained as described above has a melt viscosity at 100 ° C. of 7000 Pa · s or more and an expansion ratio of 10 times or more, so that it ensures soft foaming while softening during foaming. Sagging can be reduced. Therefore, in the foam filling member of the present invention, if the resin layer is heated after adhering the adhesive layer to the vertical surface, the resin layer is good while the foam filling member can be fixed easily and reliably to the vertical surface. Can be foamed and crosslinked, thereby forming a foam for filling. And with the filling foam, the internal space between the members and the hollow member can be filled without a gap.

  Moreover, the foam filling composition ensures good foaming and reduction of sagging due to its own composition, so the space of the member to be filled (between the members that need filling of the filling foam or hollow It can be formed into a simple and free shape according to the internal space of the member. Therefore, the foam filling member of the present invention can be manufactured in a low-cost and free shape, and can be fixed to a simple and free place only by sticking the adhesive layer to the member to be filled.

Next, as an embodiment of a method for using the foam filling member of the present invention, a method for filling the interior space of an automobile pillar as a hollow member will be described.
In FIG. 1, a pillar 1 is a front pillar, a side pillar, a rear pillar, etc., is formed in a hollow rectangular tube shape having a substantially rectangular shape in cross section, and is arranged in a vertical direction.
In this method, first, as shown in FIG. 1A, the foam filling member 5 is fixed to the inner wall surface 2 of the pillar 1 arranged in the vertical direction. In order to fix the foam filling member 5 to the inner wall surface 2, for example, when a separator is attached, the separator is peeled off from the surface of the adhesive layer 6 of the foam filling member 5, and then the adhesive layer 6 is removed. Adhere to the inner wall surface 2 of the pillar 1.

The pillar 1 includes an inner panel 3 and an outer panel 4 having a substantially concave cross section. First, after fixing the foam filling member 5 to the inner wall surface 2, both ends of the inner panel 3 and the outer panel 4 are opposed to each other. And it is formed as a closed section by joining by welding.
Thereafter, in this method, the inner wall surface 2 of the pillar 1 is subjected to a rust prevention treatment in the painting process, and then, for example, as shown in FIG. For example, the filling foam 8 is formed by foaming and crosslinking the resin layer 7 by 110 to 220 ° C., and the filling foam 8 fills the internal space of the pillar 1 without a gap.

The shape, installation position, arrangement direction, number of arrangements, and the like of the foam filling member 5 are appropriately selected according to the shape of the pillar 1 and the like.
Thus, the pillar 1 is sufficiently reinforced by the filling foam 8 and effectively prevents the vibration and noise of the engine or wind noise from being transmitted to the vehicle interior. Can do.

  In the above description, the foam filling member of the present invention is fixed to the vertical surface. However, the foam filling member of the present invention is not limited to the vertical surface, and may be fixed to, for example, a horizontal surface or an inclined surface. The method of use is appropriately selected depending on the purpose and application.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the examples.
1) Examples and Comparative Examples (Preparation of foam filling compositions)
In the blending formulation shown in Table 1, the components were blended and kneaded with a Banbury mixer to prepare the foam filling compositions shown in the examples and comparative examples as kneaded products.

  In this kneading, first, as a master batch component, a polymer, a filler, a tackifier and a softening agent are blended, and after kneading with a Banbury mixer, the master batch is prepared, As a final batch component, a foaming agent, a foaming aid, a crosslinking agent, and a crosslinking accelerator were blended, and further kneaded with a sigma blade to prepare a foam filling composition as a kneaded product.

Table 1 shows the melt viscosity (Pa · sec) of each example and each comparative example. The measurement of melt viscosity is as follows.
(Preparation of foam filling member)
The kneaded material obtained as described above is continuously extruded by an extruder to continuously form a resin layer having a thickness of 3 mm, and a rubber-based adhesive (trade name Therma Beta RSE-410, manufactured by Nitto Denko Corporation) After continuously extruding with an extruder to form an adhesive layer having a thickness of 1.0 mm, the resin layer and the adhesive layer are superposed on each other, and then continuously crimped by a calender roll, thereby foaming with a thickness of 4 mm. A filling member was obtained.
2) Foaming ratio The foaming filling members of each Example and each Comparative Example were foamed by heating at 160 ° C. for 20 minutes to obtain the foaming ratio. The results are shown in Table 1. The expansion ratio in Table 1 was obtained from expansion ratio = density before foaming / density after firing.
3) Sagging property Each example and each comparative example formed in a sheet shape was cut into 3 mm (thickness) × 25 mm (width) × 50 mm (length) to prepare a sample.

  As shown in FIG. 2A, the adhesive layer of the sample was attached to the surface (vertical surface) of the steel plate arranged in the vertical direction so that the longitudinal direction was along the vertical direction. Then, as shown in FIG.2 (b), it heats at 160 degreeC for 20 minutes, it is made to foam, About the part which protruded up and down from the adhesion layer after foaming, from the length of the part (L) which protruded downward, The sagging property was evaluated by subtracting the length of the portion (U) protruding upward. The results are shown in Table 1.

  The sagging target value is 3 mm or less.

(Measurement of melt viscosity)
1) Measuring device (flow tester CFT-500D (flow characteristic evaluation device) manufactured by Shimadzu Corporation)
Cylinder internal structure: piston area 1 cm ² , die length 10 mm, die hole diameter 1 mm
2) Measurement conditions Preheat: 3 minutes, test pressure: 1961330 Pa (20 kgf), measurement interval: 3 mm (calculation start position) to 7 mm (calculation end position)
3) Measurement method In accordance with JIS K 7210 (flow test), the flow rate was measured with the above-described measurement apparatus and measurement conditions. The flow rate Q is obtained from the following equation (1). Then, melt viscosity n was calculated | required from following Formula (2).

Q = (X / 10) · (A / t) (1)
Q: flow rate, t: measurement time (s), X: movement amount of piston with respect to measurement time t (mm), A: piston area (cm ² )
n = (πD ⁴ P) / (128LQ) × 10 ⁻³ (Pa · s) (2)
n: melt viscosity, D: die hole diameter, P: test pressure, L: die length

As one embodiment of the method of using the foam filling member of the present invention, it is an explanatory view of a method of filling the interior space of an automobile pillar as a hollow member, wherein (a) shows the foam filling member arranged in the vertical direction. (B) shows a state in which a foam for filling is formed by foaming and cross-linking the resin layer of the foam filling member, and the internal space of the pillar is filled without any gaps. . It is explanatory drawing for demonstrating the sagging evaluation method, Comprising: (a) is the state which stuck the adhesion layer of the sample to the surface of the steel plate arrange | positioned to a perpendicular direction, (b) is foaming of a sample. Shown later.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pillar 2 Inner wall surface 3 Inner panel 4 Outer panel 5 Foam filling member 6 Adhesive layer 7 Resin layer 8 Foam for filling

Claims (7)

  A composition for foam filling, comprising a polymer, a foaming agent and a crosslinking agent, having a melt viscosity at 100 ° C. of 7000 Pa · s or more and an expansion ratio of 10 times or more.   2. The foam filling composition according to claim 1, comprising 5 parts by weight or more of the foaming agent with respect to 100 parts by weight of the foam filling composition.   The foam filling composition according to claim 1, wherein the polymer contains a styrene-based thermoplastic elastomer and a styrene-butadiene rubber.   The composition for foam filling according to claim 3, wherein the styrene-butadiene rubber is contained in a proportion of 70 parts by weight or less with respect to 100 parts by weight of the styrene-based thermoplastic elastomer.   The foam filling composition according to claim 3 or 4, wherein the styrene-based thermoplastic elastomer has a weight average molecular weight of 130,000 or more. A resin layer comprising the foam filling composition according to claim 1;
A foam filling member comprising: the resin layer laminated; and an adhesive layer for fixing the resin layer to a member to be filled.   A foam for filling, which is obtained by foaming the foam filling composition according to claim 1.

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