JPH07186845A - Interior materials for automobiles - Google Patents

Abstract

(57) [Summary] [Purpose] An automobile interior material mainly composed of fibers,
Configuration capable of maintaining its shape even in an environment of 80 ° C. or higher [Constitution] The first thermoplastic resin fiber layer on the mounting side and the second thermoplastic resin fiber layer on the base material side are flexible and non-thermoplastic mesh-like The fibers are laminated by interlacing the fibers sandwiching the body, and the second thermoplastic resin fiber layer is impregnated with latex.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior material, and more particularly to a material mainly composed of fibers.

[0002]

2. Description of the Related Art Heretofore, there have been mainly composed of fibers for automobile interior panels, head linings, floor linings and the like. This kind of interior panel is
In addition to the properties required for interior panels, such as moldability, light weight, good feel, and good sound absorption, by interlocking the fibers of the outer layer with the fibers of the base layer The advantage is that they can be laminated without using an adhesive. A conventional example of such an interior material is shown, for example, in Japanese Utility Model Publication No. 1-41631. A layered product in which a fabric (for surface mounting) such as a woven fabric or a non-woven fabric in the upper layer is laminated with a cotton swatch (base material) through an intermediate entangled fiber, and a thermoplastic synthetic resin emulsion is impregnated in the lower portion of the cotton swatch. After preheating, it is formed into a desired shape with a mold, and is a preferable interior material that satisfies the above-mentioned required characteristics. One of the problems of the conventional technology is that heat resistance is insufficient. This type of automobile interior material is often required to withstand an environment exceeding 80 ° C, but in the conventional configuration, the material is mainly composed of a thermoplastic resin, In an environment that exceeds 1.0, the material softens and the overall bending rigidity becomes insufficient, which may cause deformation. In particular, in the case of a laying mode in which the interior material needs to support its own weight, such as a headlining, if the rigidity is insufficient, the shape of the interior material tends to sag. One way to solve this is to increase the weight of the interior material to improve the rigidity, but this is not preferable because it leads to an increase in weight.

[0003]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and in a vehicle interior material mainly composed of a thermoplastic resin, has improved heat resistance without increasing the basis weight and thickness. To provide the configuration.

[0004]

Means for Solving the Problems The means of the present invention for solving the problems is an interior material for an automobile, which is formed by laminating each fiber layer on the surface side / base material side, and the first side on the surface side. The thermoplastic resin fiber layer and the second thermoplastic resin fiber layer on the base material side are laminated by interlacing the fibers with a flexible non-thermoplastic mesh body sandwiched therebetween, and Automotive interior material in which the thermoplastic resin fiber layer is impregnated with latex,
The laminated position of the non-thermoplastic mesh, the interior material for automobiles, which is a position sufficiently close to the surface side in the thickness direction of the interior material, and the bending elastic gradient value when the interior material is pressed from the base material side. The interior materials for automobiles are 20% or more larger than the bending elastic gradient value when pressed from the exterior side, and the interior materials for automobiles each contain a latex thermoplastic resin having a glass transition point of 90 ° C. or more and a crosslinking component.

[0005]

In the interior material of the present invention, the non-thermoplastic network between the first thermoplastic resin fiber layer on the surface mounting side and the second thermoplastic resin fiber layer on the base material side acts to cause heat deformation. . That is,
For example, in the case of a laying method such as headlining that needs to support its own weight, when the interior material falls out due to an increase in environmental temperature, the length of one surface (base material side) to the other surface (covering side) is increased. It means that the
Conventionally, since there is no component that suppresses this elongation, the non-thermoplastic mesh body that is not affected by temperature stretches against what has been deformed. It is to suppress. Particularly in this case, the effect becomes more remarkable as the non-thermoplastic mesh body is located closer to the surface layer side in the thickness direction of the interior material. When a non-thermoplastic mesh is not rigid, it is flexible (even if it is not softened by heat), light and thin, so that it is pressed to the side without the mesh (base material side). Although the bending elastic modulus for suppressing deformation is small, the bending elastic modulus becomes a sufficiently large value when pressed against the side with the mesh body (mounting side). This is due to the use of this type of interior material. In consideration of the aspect, the deformation preventing action on the base material side supported by the steel plate such as the panel is small, the deformation preventing action on the mounting side not supported by such a support is increased, and the weight of the interior material is greatly increased. There is no end. Furthermore, when the latex impregnated in the second thermoplastic resin fiber layer contains a component having a glass transition point of 90 ° C. or higher and a crosslinking component, the heat resistance in an environment exceeding 80 ° C. is further improved. .

[0006]

EXAMPLES Preferred examples of the present invention will be shown below. FIG. 1 is a schematic cross-sectional view of an interior material of the present invention, which includes a first thermoplastic resin fiber layer 1 for surface mounting, a non-thermoplastic mesh body 3, and a second thermoplastic resin fiber layer impregnated with latex. 2 are laminated in this order, and the fibers of the first and second thermoplastic resin fiber layers are intertwined with each other via a non-thermoplastic mesh. FIG. 1 shows a case where the non-woven fabric is entangled by a general needling. As the fiber material of the first and second fiber layers, general-purpose thermoplastic resin fibers can be used, and polyester, nylon and polypropylene are preferable. The fiber diameter is preferably 5 to 30 denier. The fiber diameter is mainly defined by a post-process in which fiber materials are entangled with each other, for example, a needling process. Further, in the case of the first fiber layer, since it has a function of covering, it is preferable to use dyed yarn dyed in a specific color tone. As for the basis weight, the first fiber layer is 100 g /
less cm ² or more 200 g / cm ² is preferred. The minimum areal weight is defined as the amount necessary for entanglement with the second fiber layer as the amount necessary to ensure designability, and the maximum areal weight is defined in terms of suppressing an increase in weight. 20 second fiber layers
It is preferably 0 g / cm ² or more and less than 600 g / cm ² . The minimum areal weight is defined by the amount required to ensure the rigidity required for this interior material, and the maximum areal weight is limited in the sense of suppressing the increase in weight. The non-thermoplastic reticulated body is preferably a flexible fibrous body, for example, a jute fiber having a diameter of about 10 μm or a glass fiber made into a multifilament and reticulated. The shape of the stitches may be arbitrary, but the size of the stitches is preferably such that there are 10 to 50 stitches per cm ² . This is because if the stitches are too small, it will be difficult to entangle the first and second thermoplastic resin fibers in a later step, and if the mesh is too large, the stiffness will be weak and the stitches may not twist and function. . Although this net-like body is elastic, it is still flexible and not rigid. The second thermoplastic resin fiber layer is impregnated with a latex containing a thermoplastic component having a glass transition point of 90 ° C. or higher and a crosslinkable component.
The impregnation amount is preferably 250 g / m ² or more and less than 400 g / m ² . The latex is preferably a styrene-butadiene copolymer latex, which is formed by blending a styrene resin having a glass transition point of 105 ° C. The blend ratio is preferably 1: 1 to 5 with respect to 1 of styrene-butadiene copolymer resin. Further, 1 to 10% of the whole latex is mixed with isocyanate as a crosslinking component. The latex can be impregnated into the second thermoplastic resin fiber layer by any method such as coating with a doctor knife, but the latex drying step (1
It is preferable to advance the crosslinking reaction of the crosslinking component at 40 to 150 ° C. When this interior material is molded, it is preheated to a temperature of 180 to 230 ° C. in advance to soften the fibers of the first and second thermoplastic resin fiber layers, and heat in the latex impregnated in the second fiber layer. It is suitable to soften the plastic component and press-mold it with male and female press molds. Specific Example 1 is shown below in Table 1.
2 and Comparative Examples 1 to 4 will be described. Examples 1 and 2 The first thermoplastic resin fiber is composed of polyester fiber, the second thermoplastic resin fiber is composed of polyester fiber (recycled cotton), and as the non-thermoplastic mesh, jute fiber is used. Or, those obtained by organizing glass fibers were used.
The second thermoplastic resin fiber layer is impregnated with latex, and this latex is a blend of a styrene-butadiene copolymer and styrene (blend ratio 4: 6), and is mixed with 3% of isocyanate as a crosslinking component. It was done. In these examples, the bending elastic gradient (value measured with a span of 100 mm and a sample width of 50 mm, Kgf /
cm) was enhanced especially when pressed from the back side (second thermoplastic fiber layer side), and the heat resistance was a favorable result in combination with the action of the latex containing the crosslinking component. Comparative Examples 1 to 4 Comparative Example 1 is an example in which a mesh body is not used, and in this case, the bending elastic gradient is weak against pressing from both front and back, and heat resistance is also impossible. Comparative Example 2 is a case where the latex is not impregnated with a cross-linking component and has a certain rigidity at room temperature, but the latex tends to soften in an environment of 80 ° C. or higher, and the heat resistance is insufficient. Met. In Comparative Example 3, the arrangement of the non-thermoplastic reticulate body is such that the basis weight of the first thermoplastic fiber layer is equal to the basis weight of the second thermoplastic resin fiber layer, so that the non-thermoplastic net body is sufficiently arranged on the mounting side in the thickness direction. This is when the position is not close to. In this case, the ratio of the bending elastic gradients on the front and back sides was 1.2 or less, the function of the reticulate body was not sufficiently exhibited, and the heat resistance was insufficient. Comparative Example 4
This is an example in which the second thermoplastic resin fiber layer is not impregnated with latex, and instead a melt fiber having a low melting point is mixed to form the layer. In an environment of 80 ° C. or higher, the material softens and shrinks, the molded shape cannot be maintained, and the heat resistance is impossible.

[0007]

INDUSTRIAL APPLICABILITY The automobile interior material of the present invention can be laminated on the surface side and the base material side without using an adhesive, and is lightweight and has excellent rigidity, sound absorption and heat resistance. It is a material.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an interior material of the present invention.

[Explanation of sign]

 DESCRIPTION OF SYMBOLS 1 ... 1st thermoplastic resin fiber layer 2 ... 2nd thermoplastic resin fiber layer 3 ... Non-thermoplastic resin fiber reticulate body 4 ... Needling trace A ... Dressing side B ... Substrate side

[Table 1]

Claims (4)

[Claims] 1. An interior material for an automobile, which is obtained by laminating each fiber layer on the surface side / base material side, wherein a first thermoplastic resin fiber layer on the surface side and a second thermoplastic resin on the base material side. The fiber layers are laminated by interlacing the fibers with a flexible non-thermoplastic mesh interposed therebetween, and the second thermoplastic resin fiber layer is impregnated with latex. Automotive interior materials 2. The interior material for an automobile according to claim 1, wherein the non-thermoplastic mesh body is laminated at a position sufficiently close to the mounting side in the thickness direction of the interior material. Interior materials for automobiles 3. The automobile interior material according to claim 1, wherein the bending elastic gradient value when the interior material is pressed from the base material side is 20% of the bending elastic gradient value when pressed from the mounting side. Automotive interior materials characterized by being larger than the above 4. The automobile interior material according to claim 1, wherein the latex contains at least a thermoplastic component having a glass transition point of 90 ° C. or higher and a crosslinking component. Automotive interior materials