JP2008093152A - Pad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pad restraining or preventing a sound generated from the pad being rubbed with a frame to fix the pad. <P>SOLUTION: The vehicle sheet-pad 21 consists of a pad body 22 and a rubbing-sound preventing layer 23 formed on the back of the body 22. The pad 21 is fixed to a metal frame to be installed inside the vehicle. The layer 23 is formed through an application of a mixture including liquid rubber or the liquid rubber and a catcher agent. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pad such as a vehicle seat pad made of a flexible foam such as polyurethane foam, and more particularly to a pad in which a rubbing sound generated by rubbing between a frame for attaching the pad and the pad is suppressed.

  Pads made of flexible foam such as polyurethane foam are often used for vehicle seats. When this pad is arranged so as to be in contact with a frame such as a seat pan, abnormal noise (friction noise) may be generated during running, sitting, or sitting. Also, when assembling a sheet in a sheet maker, abnormal noise (friction noise) may occur. Such abnormal noise is often uncomfortable for a seated person or an assembly worker, and is desirably prevented or suppressed.

  In order to prevent or suppress the occurrence of such abnormal noise (rubbing sound), a nonwoven fabric is provided on the back surface of the seat body in contact with the seat frame or the spring (for example, Japanese Patent Laid-Open No. 5-138787). .

  In this way, when providing a non-woven fabric in the contact portion with the seat frame etc. on the back surface of the seat body, the non-woven fabric is held on the inner surface of the mold and integrally foamed with the pad, or the non-woven fabric is attached with an adhesive, It takes a lot of time.

  By the way, in general, a seat pad made of a flexible polyurethane foam having a high cushioning property is used for an automobile seat, but these are contained in a polyurethane foam raw material or generated during a urethane reaction. Due to volatile organic compounds (VOC) such as formaldehyde and acetaldehyde, some volatile organic compounds diffuse from the pad after foam molding, and countermeasures are required.

Japanese Patent No. 3069845 describes that a deodorant component-containing liquid is coated on the surface of building materials, fiber products, etc., and a hydrazide compound having an aldehyde decomposition action is described as this deodorant component.
JP 5-138882 Patent 3069845

A first object of the present invention is to provide a pad capable of suppressing (or sometimes referred to as “preventing”) rubbing noise between a pad and a frame for attaching the pad.
In addition to preventing the above-mentioned rubbing noise, the present invention sufficiently prevents or suppresses volatilization of the volatile organic compound (VOC) from the pad (hereinafter sometimes referred to as prevention). A second object is to provide a pad that can also be used.

  The pad according to claim 1 is a pad made of a flexible foam and attached to the frame, and at least a portion of the surface of the pad main body that contacts the frame is prevented from rubbing generated by rubbing between the pad main body and the frame. In the pad provided with the rubbing sound prevention layer, the rubbing sound prevention layer is made of rubber.

  The pad of claim 2 is characterized in that, in claim 1, the rubbing sound prevention layer further contains a catcher agent for trapping volatile organic substances.

  The pad of claim 3 is characterized in that, in claim 2, the rubbing sound preventing layer is formed by applying a mixture of a liquid rubber added to an aqueous solution of a catcher agent.

  The pad of claim 4 is characterized in that, in claim 3, the mixture is obtained by dispersing 0.1 to 10% by mass of a liquid rubber in an aqueous solution of a catcher agent.

The pad of claim 5 is characterized in that, in claim 3 or 4, the amount of solid content of the mixture is 0.5 to 10 g / m ² .

  The pad according to claim 6 is the pad according to any one of claims 1 to 5, wherein the rubber is at least one selected from the group consisting of BR, SBR, NBR, silicone rubber, urethane rubber, IR, IIR, EPDM and CR. It is characterized by being a seed.

  The pad according to claim 7 is the pad according to any one of claims 1 to 6, wherein the pad is made of polyurethane foam.

  A pad according to an eighth aspect is the vehicle seat pad according to any one of the first to seventh aspects.

  In the pad of the present invention, since the rubbing sound prevention layer is provided on the surface of the pad main body in contact with the frame, the pad main body and the frame do not directly rub against each other, and generation of rubbing noise occurs. Is prevented.

  Moreover, in the pad of this invention, since a rubbing sound prevention layer consists of rubber | gum, it can form easily by apply | coating liquid rubber to a pad main body.

  In the pad of the present invention, the rubbing sound prevention layer preferably further contains a catcher agent that captures volatile organic substances (VOC). In this case, the rubbing sound prevention layer prevents the rubbing sound from being generated between the pad main body and the frame and sufficiently prevents or suppresses volatilization of the volatile organic compound (VOC) from the pad. Further, since this rubber functions as a binder for the catcher agent, the catcher agent can be firmly attached to the surface of the pad main body, and the catcher agent is prevented or suppressed from falling off from the pad main body over time.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing a vehicle seat pad 21 according to an embodiment.

  The vehicle seat pad 21 includes a pad main body 22 and a rubbing sound prevention layer 23 formed on the back surface of the pad main body 22.

  The vehicle seat pad 21 is mounted in a vehicle by being attached to a metal frame (not shown). At the time of attachment, the vehicle seat pad 21 is attached to the metal frame so that the portion of the vehicle seat pad 21 where the rubbing sound prevention layer 23 is formed contacts the metal frame.

  The rubbing sound prevention layer 23 is made of rubber and contains a catcher agent as necessary.

  In the vehicle seat pad 21, the rubbing sound prevention layer 23 is interposed between the pad main body 22 and the metal frame. Therefore, the pad main body 22 and the metal frame do not directly rub against each other. Generation of rubbing noise between the pad main body 22 and the metal frame is prevented.

  The rubbing sound prevention layer 23 can be easily formed by applying liquid rubber to the pad main body 21.

  Moreover, when this rubbing sound prevention layer 23 contains a catcher agent, the volatile organic compound (VOC) in the pad main body 22 is captured by this catcher agent. Thereby, volatilization of VOC is sufficiently prevented or suppressed. Further, since the rubber functions as a binder for the catcher agent, the catcher agent can be firmly attached to the surface of the pad main body, and the catcher agent is prevented or suppressed from falling off from the pad main body over time.

  Next, details of the pad main body 22 and the rubbing sound prevention layer 23 will be described.

<Pad body>
The pad body is preferably made of polyurethane foam. This polyurethane foam is obtained by foam-molding a polyurethane foam blend mainly composed of polyol and isocyanate.

  Examples of the polyol include dihydric to hexavalent polyhydric alcohols, polyoxyalkylene polyols (polyether polyols), polyester polyols, polymer polyols, and the like. Of these, polyether polyols and polyester polyols are preferably used, and polyether polyols are particularly preferably used. These polyols may be used alone or in combination of two or more.

  Known isocyanates can be used as the isocyanate. For example, tolylene diisocyanate, diphenylmethane diisocyanate, triphenyl diisocyanate, xylene diisocyanate, polymethylene polyphenylene polyisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and the like can be mentioned, and these can be used alone or in combination of two or more. May be.

  Among these, in the present invention, it is preferable to use tolylene diisocyanate (TDI) and / or diphenylmethane diisocyanate (MDI) as the isocyanate from the viewpoint of the molding density region. Here, the TDI is not particularly limited, but is a mixture having a blending ratio of 2,4-TDI and 2,6-TDI of 80/20 to 50/50 (mass ratio). A mixture of 80/20 to 65/35 (mass ratio) is particularly preferable. The MDI is not particularly limited, and can be used regardless of its molecular weight distribution. For example, pure (Pure) MDI (4,4'-MDI), polymeric MDI, crude MDI, etc. It can be used suitably.

  When the TDI and MDI are used in combination, the mixing ratio of the two is usually 20/80 to 90/10 (mass ratio) as the value of TDI / MDI (mass ratio), preferably 50/50 to 80/20 ( Mass ratio).

  Although the compounding quantity of the said isocyanate is not restrict | limited in particular, It is 20-100 mass parts normally with respect to 100 mass parts of all polyols, Preferably it is 25-60 mass parts. If the amount of isocyanate is too small, the resinification reaction proceeds too much, resulting in closed cells and a suitable sheet may not be obtained. On the other hand, if the amount is too large, curing of the polyurethane foam may be delayed.

  From the viewpoint of adjusting (increasing) the hardness of the polyurethane foam molded article, a crosslinking agent can also be blended in the polyurethane foam blend. Examples of such a crosslinking agent include trimethylolpropane, diethylene glycol, sucrose (sugar), pentaerythritol, 1,4-butanediol, dipropylene glycol, ethylenediamine, glycerin, etc., and PO or EO added thereto. And alkylene oxide homopolymers (EO homopolymers and PO homopolymers). In particular, when an EO homopolymer is used as a cross-linking agent, it is possible to moderately suppress the initial reaction when the polyurethane foam compound is foam-cured, and the liquid spreads and foams to every corner in the mold. As a result of the stock solution being easily spread, abnormalities in the outer shape of the molded product (such as “chips” at the corners) are less likely to occur.

  A commercial item can be used as said crosslinking agent, For example, Takeda Pharmaceutical Co., Ltd. product T-880, the company GR-04, Dow polyurethane Japan Co., Ltd. XQ82211 etc. can be mentioned.

  Although it does not specifically limit as a compounding quantity of the said crosslinking agent, It is 0.1-10 mass parts normally with respect to 100 mass parts of all polyols, Preferably it is 1-5 mass parts.

  In the polyurethane foam formulation, a foaming agent, a catalyst, a foam stabilizer and the like can be blended as necessary in the same manner as in a normal polyurethane foam formulation.

  The foaming agent can be appropriately blended as necessary. For example, water can be suitably used, but a compound having a low boiling point such as methylene chloride and monofluorotrichloromethane can also be used. The blending amount of the foaming agent is appropriately adjusted, but is usually 0 to 15 parts by mass, preferably 1 to 5 parts by mass with respect to 100 parts by mass of the total polyol.

  As the catalyst, for example, amine-based and tin-based catalysts are preferably used. Examples of amine catalysts include tetramethylhexamethylenediamine, pentamethyldiethylenetriamine, dimethylcyclohexylamine, bis- (dimethylaminoethyl) ether, tetramethylpropylenediamine, trimethylaminoethylpiperazine, tetramethylethylenediamine, dimethylbenzylamine, methylmorpholine, Examples of tin-based catalysts such as ethylmorpholine and triethylenediamine include stannous octate and dibutyltin dilaurate. These may be used alone or in combination of two or more. Among them, triethylenediamine is suitably used for promoting resinification, and diethanolamine is suitably used for controlling the breathability of the resulting foam. As a compounding quantity of a catalyst, it is 0-5 mass parts normally with respect to 100 mass parts of all the polyols, Preferably it is 0.1-1 mass part.

  Examples of the foam stabilizer include organopolysiloxanes, alkyl carboxylates, and alkylbenzene sulfonates. As a compounding quantity of a foam stabilizer, it is 0-5 mass parts normally with respect to 100 mass parts of all the polyols, Preferably it is 0.5-2 mass parts.

  Furthermore, various additives can be added to the polyurethane foam formulation as necessary. For example, colorants such as pigments, fillers such as calcium carbonate, antioxidants, flame retardants, and UV absorbers. , A light stabilizer, a conductive substance such as carbon black, an antibacterial agent, and the like can be blended.

  The polyurethane foam molded article is obtained by foam-curing the above polyurethane foam composition. As the foaming method, for example, a one-shot method or a prepolymer method can be employed. The foaming temperature is usually 0 to 40 ° C., preferably 15 to 25 ° C., and the value of (specific gravity of foam molded product / specific gravity of raw material before foaming) is usually 1/10 to 1/50.

<Anti-rubbing layer>
This rubbing sound prevention layer is formed by applying liquid rubber.

  Examples of the liquid rubber include BR, SBR, NBR, silicone rubber, urethane rubber, IR, IIR, EPDM, CR, and the like, but are not limited thereto.

  As the catcher agent that may be blended with this rubber, various kinds of agents that capture VOC can be used. For example, amines, imines, amidines, amides, carbamides that capture formaldehyde and acetaldehyde, Nitrogen-containing organic compounds that react chemically with aldehyde gas and exhibit a trapping action, such as hydrazides, azoles, azines, amino acids, and the like can be used.

  In addition, since aldehydes such as acetaldehyde and formaldehyde in the polyurethane foam molded article are reduced by thiosulfate, sodium thiosulfate, potassium thiosulfate, and the like can also be used.

  Commercially available products can be used as the catcher agent, for example, Air Wash SPU3 Kai (Idemitsu Techno Fine), Chemcatch S5000SP04E (Otsuka Chemical), Kesmon KP240 (Toagosei), Polyfix FA15 (Showa Polymer), Air Wash SPU4 (Idemitsu Technofine), Efnica PM-W (Nanban Efnica), etc. can be mentioned.

  This rubbing sound prevention layer is preferably formed by applying a mixture obtained by adding liquid rubber to an aqueous solution of a catcher agent. In this case, it is particularly preferable that the mixture is obtained by dispersing 0.1 to 10% by mass of liquid rubber with respect to the aqueous solution of the catcher agent. When it is less than 0.1% by mass, the effect of preventing rubbing noise is small. When it is more than 10% by mass, it is difficult to disperse the liquid rubber.

The amount of solid content of the mixture is preferably 0.5 to 10 g / m ² . When it is less than 0.5 g / m ² , both the VOC volatilization prevention effect and the rubbing sound prevention effect are small. If it is greater than 10 g / m ² , there will be inconvenience that it takes time to dry, and the surface feel is poor due to the influence of the liquid rubber.

  Moreover, you may contain the dispersing agent which disperse | distributes this catcher agent as needed. As the dispersant, for example, a nonionic surfactant, an anionic surfactant, or a cationic surfactant can be used.

  Furthermore, you may contain adsorbents, such as activated carbon, as needed.

  <Rubbing characteristic evaluation device>

  Next, an example of an apparatus for evaluating such pad rubbing sound will be described.

  FIG. 2 is a side view of the sliding property evaluation apparatus, and FIG. 3 is a perspective view from below of the test piece and the holding member.

  A slide base 2 is installed on the upper surface of the machine frame 1 so as to be movable in the left-right direction in FIG. The slide base 2 is movable along a guide rail (not shown) on the machine frame 1 and is also provided with a left end position 2 indicated by a solid line in FIG. 2 by a stroke device 3 provided in the machine frame 1. It is configured to reciprocate between the right end position indicated by the dotted line. As the stroke device 3, a slider crank mechanism using a motor as a drive source is employed in this embodiment. However, the present invention is not limited to this, and various rotary motions such as a cam mechanism are converted into linear reciprocating motions. A motion mechanism can be used.

  The upper surface 2a of the slide base 2 is a bowl-shaped convex curved surface that constitutes a part of the side surface of a cylindrical or elliptical column, and an iron plate 4 is attached to the slide base upper surface 2a as a metal plate by bolts, screws, clamps, or the like. Yes.

  A test piece holding member 6 is provided above the center of the machine frame 1. As will be described later, the test piece 10 is attached to the lower surface 6a of the test piece holding member.

  In the present invention, in order to prevent abnormal noise, a rubbing sound prevention layer is provided on a pad main body made of urethane foam or the like. For this reason, the test piece 10 is made of a pad body in which a rubbing sound prevention layer is stuck on the lower surface (sliding surface with the iron plate 4).

  The test piece holding member 6 is attached to the lower end of the vertical rod 7. The rod 7 is slidably inserted into the insertion hole 8 a of the guide holder 8. The rod 7 and the insertion hole 8a are non-circular, and the rod 7 cannot rotate about its axis. Thereby, the bending direction of the lower surface 6a of the holding member 6 and the bending direction of the lower surface 6a of the upper surface 2a of the slide base 2 are always kept in a matched state.

  A weight 9 is detachably mounted on the top of the rod 7. The weight 9 has an annular shape, and is fitted and held on the convex pin 7 at the upper end of the rod 7. By placing the weight 9, the test piece 10 is pressed against the iron plate 4 with a constant force.

  As shown in FIG. 3, the lower surface 6a of the test piece holding member 6 is a bowl-shaped convex curved surface that constitutes a part of a side surface of a cylindrical or elliptical column. The test piece 10 is attached to the lower surface 6a.

  The test piece 10 has a rectangular main plate portion 10a that overlaps the lower surface 6a and a pair of ear pieces 10b that protrude from the main plate portion 10a in opposite directions. The ear piece 10b is turned to the side surface 6b of the holding member 6 or the upper surface of the holding member 6 and fastened to the holding member 6 with screws, clamps or the like. A microphone 11 is installed above the machine frame 1 and at a position slightly spaced laterally. The entire device is installed in an anechoic chamber.

  In order to perform an evaluation test using the thus configured sliding characteristic evaluation apparatus, a test piece 10 is attached to the lower surface of the holding member 6 and a weight 7 having a predetermined weight is attached to the upper portion of the rod 7 as shown in FIG. , The test piece 10 is pressed against the iron plate 4, and the stroke device 3 is driven. As a result, the slide base 2 reciprocates between the left end position indicated by the solid line in FIG. 2 and the right end position indicated by the two-dot chain line, and the iron plate 4 and the test piece 10 slide. Sound generated by this sliding is collected by the microphone 11.

  Note that the test piece holding member 6 moves up and down as the slide base 2 reciprocates left and right, but the test piece 10 is always pressed against the iron plate 4 with a constant load.

  By analyzing the frequency and sound pressure level of the collected sound, the frequency and magnitude of the abnormal sound generated by sliding can be quantitatively determined. Therefore, the test piece 10 is provided with a rubbing sound prevention layer on the surface of the vehicle seat pad main body, and the iron plate 4 is made of the same material as the seat pan. And the size can be predicted quantitatively.

  If necessary, by performing the same test while changing the weight of the weight 9, it is possible to measure the noise generation characteristics according to the weight of the seated person.

  By continuing the above measurement for a long time, it is possible to quantitatively measure the temporal change in the generation behavior of the abnormal noise.

  When the sliding characteristics evaluation of urethane foam of a vehicle seat pad is performed using the above apparatus, it is preferable that the following conditions are generally satisfied.

(1) The stroke distance of the slide base 2 is set to 30 to 200 mm.
(2) The moving speed of the slide base 2 is set to 50 to 500 mm / sec.
(3) The size of the test piece 10 is such that the length of the slide base 2 in the stroke direction is 50 to 300 mm, and the width in the direction perpendicular thereto is 10 to 100 mm.
(4) R (curvature radius) of the lower surface 6a of the holding member 6 is set to 10 to 100 mm.
(5) The R of the upper surface 2a of the slide base 2 is set to 50 to 400 mm, and is larger than the R of the lower surface of the holding member 6 by about 40 to 300 mm.
(6) The weight is 50 g to 3 kg.
(7) The iron plate 4 is sufficiently degreased by washing with methylene chloride before the test.

  The rubbing characteristic evaluation apparatus is an example, and may take a form other than that illustrated. For example, two or more slide bases 2 may be installed on a machine frame, and a holding member 6 may be provided above each slide base 2 to test a plurality of test pieces simultaneously.

  Although the iron plate is used in the rubbing characteristic evaluation apparatus, a metal plate or a resin plate other than the iron plate may be used.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.

Example 1
By mixing 100 parts by mass of the mixture shown in Table 1 and 35 parts by mass of the isocyanate shown below, this mixture (liquid temperature 25 ° C.) was poured into a mold maintained at 60 ° C. and foamed, A pad body was obtained.

Isocyanate: Tolylene Diisocyanate (TDI) / Diphenylmethane Diiso
Cyanate (MDI) = 80/20. Isocyanate equivalent 100.

Next, 4% by mass of a liquid rubber and 1% by mass of a dispersant are blended in the catcher agent aqueous solution, and this mixture is applied to the surface of the pad body (coating amount: 30 g / m ² ). A rubbing sound prevention layer was formed on the surface. In this way, a sample was prepared. In addition, the following were used as liquid rubber, a catcher agent, and a dispersing agent.

Liquid rubber: Polybutadiene rubber “Mn5000” manufactured by Aldrich
Catcher agent: Idemitsu Techno Fine aldehyde catcher agent
“Air Wash SPU3 Custom”
Dispersant: Nonionic surfactant manufactured by Kao Corporation
"Leodoll TW-0106V"

Comparative Example 1
The pad body itself was used as a sample of Comparative Example 1.

Comparative Example 2
A sample was prepared in the same manner as in Example 1 except that the above catcher agent was applied to the pad body (application amount: 30 g / m ² ) instead of the above-mentioned rubbing sound prevention layer.

<Measurement of formaldehyde and acetaldehyde>
Formaldehyde and acetaldehyde were measured by the following method. The results are shown in Table 2.

  From the pad after molding, it was cut into a length of 100 mm, a width of 80 mm, and a thickness of 70 mm, and placed in a Tedora bag. The air in the tedla bag was replaced with 4 L of dry air or nitrogen gas, and heated in an oven at 65 ° C. for 2 hours.

  The gas in the heated Tedora bag was collected in a total amount of a DNPH cartridge (GL Science Co., Ltd.), and the solution eluted with 4 mL of acetonitrile was quantified by the HPLC method.

<Confirmation of rubbing sound>
A test piece having a length of 150 mm, a width of 30 mm, and a thickness of 10 mm was cut out from the pad after molding, and the rubbing sound was confirmed using the rubbing characteristic evaluation apparatus shown in FIGS. When no rubbing sound was heard, “no rubbing sound” was set, and when rubbing sound was clearly heard, “with rubbing sound” was set. The results are shown in Table 2.

  As is apparent from Table 2, Example 1 is excellent in the function of capturing formaldehyde and acetaldehyde, and is also excellent in the function of preventing rubbing noise.

It is typical sectional drawing of the vehicle seat pad which concerns on embodiment. It is a side view of a rubbing characteristic evaluation apparatus. It is a perspective view from the downward direction of the test piece and holding member of FIG.

Explanation of symbols

21 Vehicle seat pad 22 Pad body 23 Rub sound prevention layer

Claims (8)

A pad made of flexible foam and attached to the frame,
In a pad provided with a rubbing sound prevention layer for preventing rubbing sound generated by rubbing between the pad main body and the frame on at least a portion of the surface of the pad main body that comes into contact with the frame,
The pad is characterized in that the rubbing sound prevention layer is made of rubber.   The pad according to claim 1, wherein the rubbing sound prevention layer further contains a catcher agent that traps volatile organic substances.   3. The pad according to claim 2, wherein the rubbing sound prevention layer is formed by applying a mixture obtained by adding liquid rubber to an aqueous solution of a catcher agent.   4. The pad according to claim 3, wherein the mixture is obtained by dispersing 0.1 to 10% by mass of liquid rubber with respect to the aqueous solution of the catcher agent. Pad, characterized in that in claim 3 or 4, impregnated amount of the solid content of the mixture is 0.5 to 10 g / ^{m 2.}   The rubber according to any one of claims 1 to 5, wherein the rubber is at least one selected from the group consisting of BR, SBR, NBR, silicone rubber, urethane rubber, IR, IIR, EPDM and CR. Pad to do.   The pad according to any one of claims 1 to 6, wherein the pad is made of polyurethane foam.   The pad according to any one of claims 1 to 7, wherein the pad is a vehicle seat pad.

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