JP2005264408A - Vehicle skin material and manufacturing method thereof, automotive interior material, and motorcycle and tricycle seat material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately detect a blend of PPT fiber having excellent light resistance and friction fastness and good texture and cellulose fiber excellent in moisture absorption and flame retardancy by dyeing with a vat dye. In addition, it is possible to obtain a very high-performance vehicle skin material that is excellent in the above-mentioned characteristics and relatively inexpensive.
A vehicle skin material is made of a blended fabric of PPT fibers and cellulosic fibers, and is dyed with a vat dye.
[Selection] Figure 3

Description

  The present invention relates to a vehicular skin material made of a blended fabric of polyester fiber and cellulose fiber, a method for producing the same, and an interior material for automobiles and a seat material for motorcycles and motorcycles using the skin material at least for the skin part. .

  Conventionally, it is known to use a cloth of PET (polyethylene terephthalate) fiber, which is one of polyester fibers, as an interior material for automobiles.

  Although this PET fiber is excellent in light resistance and friction fastness, it has a problem that it is poor in hygroscopicity and easily generates static electricity. Also, because PET fibers are not compatible with vat dyes (vat dyes) and are difficult to dye, they are dyed using relatively expensive disperse dyes having a molecular weight smaller than that of vat dyes, and because the burning rate is high. In addition, it is necessary to add a flame retardant to the backing resin in order to increase the flame retardancy, and the cost is increased as a whole.

By the way, in conventional dyeing techniques, vat dyes, which are less expensive than disperse dyes, have been used exclusively for dyeing natural fibers such as cellulosic fibers and have not been used for dyeing synthetic fibers. A technique for simultaneously dyeing a blended yarn of cotton, which is a natural fiber, and PET fiber, which is a synthetic fiber, with an indigo dye that is one of the above (see Non-Patent Document 1 below) has been proposed. However, the fiber cloth dyed by such a proposed technique is not yet in a practical stage as an automobile skin material.
Hiroshima Prefectural Tobu Industrial Technology Center Research Report No. 16 (2003) Technical Report (13)

  In order to solve the problems of the above-mentioned conventional skin materials for automobiles using PET fibers, blending of PET fibers with cellulosic fibers such as rayon, which is a natural fiber excellent in hygroscopicity and flame retardancy, is attempted. However, since the cellulose fiber is not easily dyed with the disperse dye and the PET fiber is difficult to dye with the vat dye, the cellulose fiber and the PET fiber cannot be dyed with the same dye. It must be used, or the yarn must be dyed with each dye and then blended.In this case, the reproducibility of the fabric color of the knitted fabric is poor, and it takes time, resulting in an increase in cost, Problems such as design restrictions have arisen, and it has not yet been put to practical use.

  By the way, since the fiber cloth of PPT (polypropylene terephthalate) whose structure is very similar to the above-mentioned PET (polyethylene terephthalate) among polyester fibers has been dyed with disperse dyes like PET fiber, the PPT fiber and rayon are conventionally used. When trying to blend with cellulosic fibers such as the above, the same problem as in the case of PET fibers occurs.

  The present invention has been proposed in view of the above. Unlike PET fibers, the present invention focuses on the physical properties of PPT fibers that have good dyeability of vat dyes, and PPT fibers and cellulosic fibers such as rayon. New and useful vehicle skin material and manufacturing method thereof, interior materials for automobiles, and seats for motorcycles and tricycles, which can solve all the conventional problems at once by dyeing the blended fabrics with the same dye (bat dye) The purpose is to provide materials.

  In order to achieve the object, the vehicle skin material of the invention of claim 1 is made of a blended fabric of PPT fibers and cellulosic fibers, and is dyed with a vat dye.

  In the present invention, the “fabric” may be any of a woven fabric (woven fabric), a non-woven fabric, and a knitted fabric, and the “fiber” may be any of a long fiber and a short fiber. Further, the “vehicle” includes various vehicles that travel on land, such as motorcycles, motor tricycles, wasteland traveling buggy vehicles, railway vehicles, and the like in addition to automobiles.

  The vehicle skin material according to the invention of claim 2 is characterized in that, in addition to the feature of claim 1, the PPT fiber is produced using plant-derived propanediol as a raw material.

  Moreover, the interior material for automobiles according to the invention of claim 3 is characterized in that at least a skin portion is constituted by the skin material according to claim 1 or 2. In the present invention, the “automobile interior material” refers to various interior materials used in the interior of an automobile such as a seat material constituting a cushion part of a seat, a pillar part of a vehicle body, a roof part, a door frame, etc. Cover materials for covering the frames, cover materials for covering interior panels such as instrument panels and console panels, and floor cover materials such as floor mats and floor carpets.

  The seat material for motorcycles and tricycles according to the invention of claim 4 is characterized in that at least the skin portion is composed of the skin material according to claim 1 or 2.

  Further, the method for manufacturing a vehicle skin material according to the invention of claim 5 includes a step of manufacturing PPT fiber using plant-derived propanediol as a raw material, and a step of creating a blended fabric of the PPT fiber and cellulosic fiber, And at least a step of dyeing the blended fabric with a vat dye.

  As described above, the vehicle skin material according to the present invention is a blended fabric of PPT fibers having excellent light resistance, friction fastness, good texture and high quality, and cellulosic fibers excellent in moisture absorption and flame retardancy. Since it is composed and dyed with vat dye, even if it is a blend of PPT fiber and cellulosic fiber, it can be dyed easily, accurately and at low cost with the same dye, and as a vehicle skin material, A high-quality vehicle skin material that is excellent in functionality (the above-mentioned characteristics) and is relatively inexpensive can be obtained.

  In particular, according to the inventions of claims 2 and 5, since the PPT fiber is produced using plant-derived propanediol as a raw material, it is compared with a case where propanediol chemically synthesized from petroleum is used as a raw material. In recent years, both PPT fibers and cellulosic fibers to be blended can be obtained from plant-derived raw materials, which can contribute to reducing environmental burdens. It is effective as equipment for automobiles and other vehicles that are required.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  In the accompanying drawings, FIG. 1 is a partial cross-sectional view of an automotive sheet material according to an embodiment of the present invention, FIG. 2 is an explanatory diagram for schematically explaining the difference in intermolecular structure between PPT and PET, and FIG. These are the flowchart figures which show roughly an example of manufacture of the skin material for vehicles, and a dyeing | staining process.

  In FIG. 1, a sheet material S as an automobile interior material is composed of a cushion body 1 such as a sponge and a cloth-like skin portion 2 that is integrally attached to the surface of the cushion body 1. In the portion 2, the vehicle skin material according to the present invention is used.

  The skin material according to the present embodiment is composed of a blended fabric of PPT (polypropylene terephthalate) fiber and rayon as cellulosic fiber, and the same dye, particularly vat dye called vat dye, It is dyed in a mixed spinning state of PPT fiber and rayon, that is, in the same dyeing process.

  The blended aspect of the “blended fabric” of PPT fiber and rayon in the present embodiment is not particularly limited. For example, a blended fabric in a woven state in which yarns made of PPT fibers and yarns made of rayon fibers are woven together. A knitted mixed fabric in which both yarns are knitted together, a woven or knitted mixed fabric made using a mixture (yarn) of PPT fibers and rayon fibers, a fabric layer made of PPT fibers and rayon It includes at least a blended fabric in which a fabric layer made of fibers is bonded to each other in a laminated state.

  In particular, the PPT (polypropylene terephthalate) fiber is produced from plant-derived propanediol as a raw material in this embodiment. In particular, in the present embodiment, plant-derived propanediol is produced using a biotechnology technology developed by DuPont that ferments corn-derived sugar to obtain 1,3-propanediol. PPT fiber is manufactured as a raw material. The PPT fiber manufactured by such a technique is called “Sorona” (registered trademark) under the trade name and has already been put into practical use.

  The rayon used in the present embodiment is a viscose rayon produced from plant-derived general cellulose.

  By the way, disperse dyes having a molecular weight smaller than that of vat dyes (virtual dyes) are usually used for dyeing PET (polyethylene terephthalate) fibers, which are most commonly used as polyester-based synthetic fibers. The bond between the dye and the fiber is based on dispersion and hydrogen bonding. And since the bonding method of both dyes is the same in this way, it seems that PET fibers are dyed with vat dyes as well as disperse dyes, but PET fibers are not actually dyed with vat dyes, whereas PPT The fiber is dyed. The reason why the vat dye has such a large difference in dyeing property seems to be that the gap between the molecules of the PET fiber is smaller than that of the PPT fiber, that is, PPT is compared with PET in FIG. As conceptually shown, it is considered that vat dyes having a relatively large molecular weight can be dyed because the intermolecular bonds are bent and there are many gaps between the molecules.

  In addition, when the PET fiber is dyed with a disperse dye, not only the dyeability but also the light resistance is good, whereas when the PPT fiber is dyed with a disperse dye, there is a gap between the PPT molecules as described above. Since it is large, it is considered that the dye is easily oxidized and deteriorated, and the result of the light resistance test is inferior to the case where the PET fiber is dyed with the disperse dye.

  On the other hand, rayon has poor dyeability of disperse dyes, but has good dyeability of vat dyes and good light resistance.

  Dyeability (easiness of dyeing) and light resistance (durability to light, that is, occurrence of discoloration when receiving predetermined light for a predetermined time) with respect to the above-mentioned disperse dyes / batt dyes on PET fiber, PPT fiber and rayon Nyakusa) is summarized as shown in Table 1 below. In Table 1, ◯ indicates good, Δ indicates slightly good, and X indicates poor.

  Thus, the skin material used in the present embodiment has the characteristics of PPT fiber having excellent light resistance and friction fastness and good texture, and cellulosic fiber excellent in moisture absorption and flame retardancy. Since it is composed of a blended fabric with rayon provided and dyed with a vat dye, even if it is a blend of PPT fiber and cellulosic fiber, it can be dyed easily, accurately and at low cost with the same dye. An extremely high-quality vehicle skin material having excellent properties (that is, functionality as a vehicle skin material) and relatively inexpensive can be obtained.

  In particular, in the production of PPT fiber as in the present embodiment, when using plant-derived propanediol as a raw material by using biotechnology, when using propanediol obtained by chemical synthesis of a petroleum-based raw material as the raw material In addition to achieving a reduction in manufacturing costs compared to the above, both PPT fibers and rayon to be blended are obtained from plant-derived raw materials, reducing the environmental burden, and in recent years severe environmental response has been achieved. It is effective as a required automobile equipment (interior material).

Next, a specific embodiment of the skin material of the present invention will be described with reference to FIG. First, PPT fiber (manufactured by DuPont PPT fiber (trade name “Sorona” (registered trademark))) is produced using propanediol obtained by biotechnology using brewed corn as a raw material. Raised tricot fabric as 400 g / m ² blended fabric made from 400 g / m ² raised tricot fabric using the same PPT fiber as the surface raised layer and intermediate layer and rayon yarn as the back base yarn Fabrics are prepared, and these fabrics are compliant with the dyeing method disclosed in Japanese Patent Application Laid-Open No. 10-280286 (synthetic fiber dyeing method using a vat dye-based indigo dye), with a bath ratio of 25: 1, 0.5 g / Dyeing with L NaOH, 0.5 g / L hydrosulfite for 30 minutes at 135 ° C. Vat dye used in this example Is 2% owf.Mikethren Yellow 3GL s / f, 2% owf.Mikethren Red F3B s / f, 2% owf.Mikethren Blue BC s / f. Three color fabrics were obtained.

These three color fabrics were irradiated with 80 MJ of test light at a BPT of 89 ° C., a humidity of 50% RH, and a radiation intensity of 100 W / m ² in a xenon arc light resistance tester manufactured by Suga Test Instruments Co., Ltd. The gray scales for discoloration (JIS) after this light resistance test were all grades 4 and above, indicating good light resistance. Therefore, it was confirmed that the PPT fiber and rayon blended fabric was dyed well with the vat dye (good dyeability) and the light resistance after dyeing was good as well as the PPT fiber-only fabric.

  As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary of the invention.

  For example, in the above embodiment, rayon is exemplified as the cellulosic fiber to be blended with the PPT fiber. However, in the present invention, the flame retardancy and hygroscopicity are good and the dyeability and light resistance when dyed with a vat dye are used. If the property is good, any cellulosic fiber other than rayon may be adopted, and the blended fabric of this and PPT fiber may be dyed with vat dye.

  Moreover, in the said Example, although what used the skin material of this invention only for a part (skin part 2) of the interior material (sheet | seat material S) for automobiles was shown, the kind of automobile interior material, and usage form For example, the skin material of the present invention may be used for the entire interior material. Furthermore, you may make it use the skin material of this invention for a part or all of the sheet | seat material of a motorcycle without a roof, or a motorbike. Even in this case, since the light resistance of the vat dye dyed on the blended fabric of PPT fiber and rayon is good, the discoloration can be effectively suppressed even when the sheet material is exposed to direct sunlight for a long time.

The fragmentary sectional view of the sheet material for cars concerning the example of the present invention. Explanatory drawing for schematically explaining the difference in intermolecular structure between PPT and PET Flow chart schematically showing an example of manufacturing and dyeing process of vehicle skin material

Explanation of symbols

S Automotive seat materials (automotive interior materials)
2 Skin part (skin material for vehicles)

Claims (5)

  A vehicle skin material comprising a blended fabric of PPT fibers and cellulose fibers and dyed with a vat dye.   The skin material for a vehicle according to claim 1, wherein the PPT fiber is manufactured using plant-derived propanediol as a raw material.   An interior material for automobiles, wherein at least the skin part (2) is composed of the skin material according to claim 1 or 2.   A seat material for motorcycles and tricycles, characterized in that at least a skin portion is composed of the skin material according to claim 1 or 2. It includes at least a step of producing PPT fiber using plant-derived propanediol as a raw material, a step of producing a blended fabric of the PPT fiber and cellulosic fiber, and a step of dyeing the blended fabric with a vat dye. The manufacturing method of the skin material for vehicles.

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