JPS62253447A - Skin agent for interior material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a skin material for interior materials. More specifically, the present invention relates to a skin material for interior materials used as a skin material for automotive interior materials such as automobile ceiling materials and sun visors.

[Prior Art] Conventionally, soft-textured non-woven fabrics or woven fabrics have been used as skin materials for automobile interior materials such as ceiling materials and sun visors, and this skin material has been combined with resin felt, cardboard, foamed plastic, etc. A material in which the material is bonded to a base material is used.

Nonwoven fabrics used as automobile interior materials include needle-punch nonwoven fabrics impregnated with a binder on one side, but nonwoven fabrics themselves have excellent breathability, and can be used, for example, as automobile ceiling materials. When the humidity inside the car is high, water vapor easily permeates through the nonwoven fabric, so the water vapor condenses on the back side of the ceiling material, dampening the nonwoven fabric, and air stagnates in the space between the roof of the car and the ceiling material. Because of this, mold may form on the back side of the ceiling material, and water droplets caused by condensation may seep onto the surface of the ceiling material with dirt.

In addition, when manufacturing interior materials made by bonding the skin material and base material, welder processing may be performed,
In order to carry out such welding processing, it was necessary to interpose a welding film or the like.

Furthermore, when a nonwoven fabric is used as a ceiling material or a surface material for a ceiling material as described above, the nonwoven fabric is breathable.
Moreover, since it has a large void inside, dust can sometimes enter the inside and cause it to become dirty.

Therefore, in order to solve the above problems, conventionally,
Various studies have been carried out, and a non-breathable film is interposed between the non-woven fabric and the base material to prevent water vapor from condensing on the back side of the ceiling material, and dust is retained inside the non-woven fabric. In order to prevent this, proposals have been made to increase the amount of binder impregnated into the nonwoven fabric.

[Problems to be Solved by the Invention] However, when a non-breathable film is interposed between the nonwoven fabric and the base material as described above, the manufacturing process becomes complicated, leading to a decrease in mass productivity. Furthermore, when the amount of binder impregnated into a nonwoven fabric is increased, the texture becomes harder and the weight of the nonwoven fabric increases, and furthermore, when molded into a predetermined shape, the moldability becomes extremely poor.

In view of the above-mentioned problems, the inventors of the present invention have conducted intensive research to create an interior skin material that can solve these problems, has no air permeability, and has excellent stain resistance. If a material in which an impregnated layer of synthetic resin emulsion containing micro hollow bodies is provided on one side and the impregnated layer is densified is used as a skin material, there will be no mold generation or air permeability as described above. The present inventors have discovered a completely new skin material for interior materials that is stain resistant, has an excellent texture, and has an extremely simple manufacturing process, and has completed the present invention.

Means for Solving Problem E] That is, the present invention provides an interior material in which an impregnated layer of a synthetic resin emulsion containing micro hollow bodies is provided on one side of a fibrous base material, and the impregnated layer is densified. Regarding skin materials for use.

[Operations and Examples] The skin material for interior materials of the present invention is provided with an impregnated layer of a synthetic resin emulsion containing micro hollow bodies on one side of a fibrous base material,
And it can be obtained by densifying the impregnated layer.

As the fibrous base material used in the present invention, materials whose fibers themselves are flexible, such as nonwoven fabrics, felts, fiber webs, etc., are used. The thickness of these materials cannot be determined unconditionally because it varies depending on the strength and thickness of the target skin material and the type of material, but it is usually 0,5~4,0 am, etc. <1.0~3
．． 0+m is used. Among the above-mentioned fibrous base materials, needle-punched nonwoven fabric can be preferably used because its thickness can be easily adjusted depending on the purpose and it has excellent moldability and strength.

The micro hollow bodies contained in the synthetic resin emulsion used in the present invention refer to hollow bodies whose outer walls are made of thermoplastic resin and whose interior is made of a thermally expandable material. It is preferable to use microspheres having a size of 50 to 50°C, which have been subjected to a heat treatment during the manufacturing process of the skin material to expand the thermally expandable substance inside the microspheres.

A specific example of the microscopic hollow body is Microsphere-F-30 (manufactured by Matsumoto Yushi Seiyaku ■, microspheres before heat treatment) whose outer wall is made of vinylidene chloride copolymer and whose interior is made of a low-boiling hydrocarbon such as isobutane. Average particle size: 10-20
), etc. The blending ratio of such micro hollow bodies is 5 to 50 ffi'm based on the total solid content of the emulsion.
%, preferably <10 to 30%. If the blending ratio is less than 5% by weight, breathability exists;
Moreover, when it exceeds 50fflQ%, the durability of the skin material decreases.

Examples of the synthetic resin emulsion include synthetic resin emulsions such as vinylidene chloride, ethylene-vinyl acetate, ethylene-vinyl chloride, acrylic-styrene, acrylic-vinyl chloride, and polyester. 20 to 100% of a synthetic resin with weldability such as vinyl chloride, acrylic-vinyl chloride, polyester, etc. is added to the synthetic resin emulsion.
Those containing 40 to 70% by weight are particularly suitable for use because they can be welded without intervening a weldable film or the like. In addition, the synthetic resin emulsion may contain thickeners, flame retardants, dispersants, pH:A regulators, wetting agents, etc., as necessary, in an amount of 5 to 35% by weight based on the total solid content of the synthetic resin emulsion. It may be added within the range of <10 to 30% by weight.

Thickeners that can be added to the synthetic resin emulsion used in the present invention include cellulose-based, alginic acid-based, and polyacrylic acid-based compounds. Flame retardants that can be added to the synthetic resin emulsion include phosphoric acid-based, oxalic acid, chlorine-based compounds, and trioxide. Antimony, ammonium hydroxide, etc. Dispersants include pigments, inorganic compounds such as aluminum hydroxide, pB adjusters include ammonia water, acetic acid, oxalic acid, etc. Wetting agents include nonionic or anionic interfaces. Examples include activators, ethylene glycol, etc., but these components may be used alone, or various components may be mixed as long as they are within the range that can be added to the total solid content in the synthetic resin emulsion. It may also be used.

The value of the ratio (hereinafter referred to as P/B) of the weight jl of the fibrous base material (hereinafter referred to as F) to the total solid content in the synthetic resin emulsion (hereinafter referred to as B) is GO/40 to 9515
The synthetic resin emulsion is applied to the fibrous base material by adjusting the ratio to preferably be 70/30 to 90/10.

If the F/B is less than 80/40, the texture of the resulting skin material will be hard and the moldability will be poor, and 9515
If it is larger than this, durability such as abrasion resistance, strength and elongation will be reduced, and the desired product without breathability will not be obtained. □ After providing an impregnated layer of a synthetic resin emulsion containing micro hollow bodies on one side of the fibrous base material, the impregnated layer is densified, but usually, in order to densify it, synthesis is performed using a calendar or the like. The impregnated surface of the resin emulsion is subjected to pressure or heating and pressure treatment. The densification is carried out to such an extent that the skin material normally obtained does not exhibit air permeability.

The thickness of the impregnated layer densified as described above is approximately 10 to 50% of the total thickness of the resulting skin material, and <25% of the total thickness of the resulting skin material.
It is preferably about 30%.

This is because if the thickness of the impregnated layer is less than 10%, breathability cannot be eliminated, whereas if it exceeds 50%, the texture becomes hard and the resin tends to seep onto the surface, which is not desirable in terms of appearance. That's because there isn't.

A skin material is thus formed, and a resin print may be applied to the surface of the skin material opposite to the synthetic resin emulsion-impregnated layer in order to increase wear resistance and provide a decorative effect. Examples of this resin print include acrylic resin and polyester resin, but the amount of adhesion is 5 to 50%.
It is used after being adjusted to 15 g/m2.

In addition, the resulting skin material has a thickness of 3.0 mm or less and a basis weight of 300 g/m from the viewpoint of weight reduction and processability such as molding.
The thickness is preferably 1.0 nus or more and the basis weight is 120 g/m2 or less from the viewpoint of durability and strength.
It is preferable that it is m2 or more.

Next, the skin material of the present invention will be explained in more detail based on Examples, but the present invention is not limited to these Examples.

Example 1 Polyester fiber (fineness: 3 denier, fiber length: 64u
After forming a web consisting of +s), a punch felt nonwoven fabric (fabric weight: L84sr) was formed using the needle punch method.
/m”, thickness: 3sm).

The obtained nonwoven fabric contains isobutane and the outer shell is made of vinylidene chloride copolymer. Microspheres-F
An acrylic-vinyl chloride resin emulsion containing 15% by weight of solid melon-30 (manufactured by Matsumoto Yushi Seiyaku ■) was impregnated onto one side of the nonwoven fabric by a foaming impregnation method.

Thereafter, the microspheres were dried at 150° C. using a drier and simultaneously foamed to form microscopic hollow bodies, followed by calendering.

The obtained skin material has a basis weight of 230g/m2, F/B
The ratio was 80/20, and the thickness of the impregnated layer was about 1/3 of the total thickness of 2.0 mm.

When the air permeability of this epidermis was measured, it was Occ/cm.
2/see, indicating no air permeability.

In addition, when a ceiling material was made using this skin material, the resulting ceiling material had a soft texture and cushioning properties, was less likely to attract dirt than conventional materials, and was also free from condensation containing dirt. There were no problems such as water seeping out.

Furthermore, when a sun visor was manufactured using this skin material, it showed good weldability and was easy to process.

Note that the air permeability was measured according to the following method.

(Measurement of air permeability) JIS L-10795, 20 was applied mutatis mutandis, and a test piece was attached to one end of the cylinder using a Francil type tester.
Blow in so that the inclined barometer indicates a pressure of 1.27 cm of water column using a rheostat, adjust the pump, and perform the test based on the pressure indicated by the vertical barometer and the type of air hole used. Determine the amount of air passing through the test piece (CG/CIl+27sec) using the table attached to the machine. Measurement is 5
times and expressed as the average value.

Comparative Example 1 The needle-punched nonwoven fabric obtained in Example 1 was impregnated with 46 g/m 2 (solid content) of an acrylic-vinyl chloride emulsion.

Thereafter, it was dried at 150°C using a dryer, and then calendered.

The resulting skin material has a basis weight of 230g/m2 and an F/B of 80.
/20, and the thickness of the impregnated layer was about ⅓ of the total thickness of 2,0 am.

When the air permeability of this skin material was measured in the same manner as in Example 1, it exhibited air permeability of 100cc/c+n2/see, and furthermore, when it was integrally molded with resin felt and used as a ceiling material, dust and dirt easily adhered to it. Also, phenomena such as condensed water seeping out onto the surface occurred.

In addition, in order to make a sun visor using this skin material, a weldable film must be interposed, and the processing is complicated.

[Effects of the Invention] The skin material of the present invention has a dense impregnated layer of synthetic resin emulsion containing micro hollow bodies, and exhibits almost no air permeability, so it cannot be used in combination with a base material such as resin felt. However, there is no condensation on the back side,
Therefore, water generated by condensation will not ooze out onto the surface along with dirt. Furthermore, since the skin material of the present invention, which is densified by a synthetic resin emulsion, has its internal voids sealed, dust does not enter into the skin material. Furthermore, the skin material of the present invention is lightweight, has a soft texture, and has excellent moldability.

Moreover, if a synthetic resin emulsion exhibiting weldability is used, there is no need to use a weldability film, and welding becomes extremely easy.

Claims (1)

[Scope of Claims] 1. A skin material for interior materials, comprising a fibrous base material, on one side of which is provided an impregnated layer of a synthetic resin emulsion containing micro hollow bodies, and the impregnated layer is densified. 2. The skin material for interior materials according to claim 1, wherein the synthetic resin emulsion is mainly composed of a synthetic resin having weldability. 3. The skin material for interior materials according to claim 1, wherein the thickness of the synthetic resin emulsion impregnated layer is 10 to 50% of the thickness of the fibrous base material.