JPH0767786B2 - Skin material for automobile interior materials - Google Patents

Description

TECHNICAL FIELD The present invention relates to a skin material for an automobile interior material. More specifically, the present invention relates to a skin material for an automobile interior material, such as a sun visor for automobiles, a door material for automobiles, a suspended ceiling material for automobiles, which requires high-frequency welding.

[Prior Art and its Problems] Conventionally, as a skin material for an automobile interior material, a skin material for trim, which is formed by laminating a film having a high-frequency welder property such as a polyvinyl chloride resin film on the skin (Japanese Patent Application Laid-Open No. 2000-242242) No. 59-207231), high-frequency adhesive fabric (see Japanese Patent Laid-Open No. 60-71245), and a carpet for automobiles with a pad formed by spraying a resin powder having a high-frequency welder property on the skin (Japanese Patent Laid-open No. Sho 60-71245). 185646),
Interior material obtained by impregnating the skin with a binder having a high-frequency welder property (see Japanese Patent Application Laid-Open No. 590-202843) or a skin material for interior material obtained by densifying one side of a fibrous base material using a micro hollow body Japanese Patent Application No. 61-97470) and the like are used.

The trim skin material, the high-frequency adhesive fabric, and the car carpet with a pad require a special processing step in order to maintain the high-frequency weldability, so that the work becomes complicated and the cost becomes high. In addition, in the interior material impregnated with a binder having a good high-frequency welder property, depending on the binder used, carbonization may occur in the welder portion due to a discharge phenomenon during welding, so-called a spark phenomenon may occur. There is a problem that the seal part of the is damaged or the desired welder adhesive strength cannot be obtained, and further, the trim skin material, the high frequency adhesive fabric and the carpet for a car with a pad, and the interior material and the skin material for the interior material. All materials were peeled off after high-frequency welding. The strength is small, practically, there is a problem in using e.g. as skin materials for automobile interior materials.

[Problems to be Solved by the Invention] In view of the problems of the conventional techniques as described above, the present inventors have earnestly studied to obtain a skin material for an automobile interior material that solves the problems. As a result, when a fiber layer made of a copolymer of vinyl chloride and vinyl acetate is provided on one surface of the fibrous base material and at least the one surface is impregnated with a resin, no special processing step is required. , A high-frequency welder property can be easily provided, the spark phenomenon does not occur during the welding process, and the peel strength after welding is 6 kg / 2.5 cm width or more, which can completely eliminate such problems. The inventors have found that a material can be obtained and have completed the present invention.

[Means for Solving Problems] That is, the present invention has a fiber layer made of a copolymer of 80 to 90% by weight of vinyl chloride and 20 to 10% by weight of vinyl acetate on one surface of a fibrous base material. And at least one of the surfaces of the fibrous base material is impregnated with a resin.

[Operations and Examples] A skin material for an automobile interior material of the present invention is a fiber made of a copolymer of 80 to 90% by weight of vinyl chloride and 20 to 10% by weight of vinyl acetate on one surface of a fibrous base material. It has a layer and is obtained by impregnating one surface with a resin.

As the fibrous base material used in the present invention, a material having a flexible fiber itself such as a non-woven fabric, felt, or fibrous web is used. The thickness of these materials cannot be unconditionally determined because it depends on the strength and thickness of the intended skin material and the type of the material.
Usually, the one with a thickness of 0.5 to 3.0 mm, which is 0.1 to 4.0 mm, is used. Among the fibrous base materials, the needle-punched nonwoven fabric, which can be easily adjusted in thickness depending on the purpose and is excellent in moldability and strength, can be preferably used.

Examples of fibers used in the fibrous base material include synthetic fibers such as polyester, polyamide, polyolefin, and acrylic; regenerated fibers such as rayon; natural fibers such as cotton and wool. Among these, among these, In particular, polyester fibers are preferable because they are excellent in light resistance and heat resistance.

A fiber made of a copolymer of vinyl chloride and vinyl acetate is used for the fiber layer provided on one surface of the fibrous base material, when such a fiber is used, there is no spark phenomenon and high frequency welder processability. This is because when the fibers are good and melted by the welding process, the fibers in the fibrous base material are formed into a film in a state of being held, so that a high adhesive force can be obtained. Further, since the film-formed portion becomes very thin, it is easier to cut as compared with the non-film-formed portion. For example, when trimming is performed after the welder, the workability is excellent and the finished appearance is excellent. The composition of the copolymer of vinyl chloride and vinyl acetate constituting the fiber is such that the weight ratio (vinyl chloride / vinyl acetate) is 80/20 to 90/10. When the weight ratio is less than 80/20, the fiber strength is weak and it becomes difficult to form the fibrous web layer, and when it exceeds 90/10, the adhesive strength due to the high-frequency welding process is reduced, and the sufficient peel strength is obtained. I will not be able to. The weight ratio of 85/15 may be generally used. The fiber made of such a copolymer has a tensile strength (tens) in order to form a web layer and to improve the entanglement effect of the needle punch.
ile strength) 5.0 to 7.5 kg f / mm ² , tensile elongation (elon
The gation) is preferably 140-260%. The thickness of the fiber layer cannot be unconditionally determined because it depends on the strength and thickness of the intended skin material and its type, etc., but it is usually 0.05 to 1.0 mm, especially 0.1 to 0.6 mm.
It is good to say

In addition, the fibrous layer, a fibrous web obtained by a card machine or the like, a non-woven fabric in which this fibrous web is partially or wholly heat-sealed by a calender roll, or the fibrous web is bonded with an acrylate-based or vinyl chloride-based emulsion. A non-woven fabric or the like is used.

The fibrous layer may be integrated with the fibrous base material during the production of the fibrous base material or after the fibrous base material is prepared, or after impregnating one surface of the fibrous base material with a resin, A fiber layer may be laminated on the impregnated surface to be integrated. This fiber layer and the fibrous base material are integrated by needle punching,
It is performed by using a bonding means such as heat fusion or an adhesive.

Next, a resin is impregnated on one surface of the fibrous base material in the form of an emulsion, and the fibrous base material having the fibrous layer is provided depending on the time of integration of the fibrous base material and the fibrous layer. There is a case where the fiber layer is impregnated from the side of the fiber layer, and a case where the fiber layer is provided on the impregnated surface after the resin is impregnated on one surface of the fibrous base material.

Such resins include acrylic-styrene resins, acrylic-vinyl chloride resins, vinylidene chloride resins, ethylene-vinyl chloride resins, acrylic ester resins,
Examples thereof include ethylene-vinyl acetate-based resins, and among these, resins having high high-frequency weldability such as acrylic-styrene-based resins, acryl-vinyl chloride-based resins and vinylidene chloride-based resins can be particularly preferably used.

The resin is preferably impregnated in the range of 20 to 80% of the thickness of the fibrous base material. When the thickness of the layer impregnated with the resin is less than 20% of the thickness of the fibrous base material, the properties as an automobile interior material, especially the wear resistance of the surface becomes poor,
On the other hand, if it exceeds 80%, the texture of the surface becomes hard and it cannot be practically used as an automobile interior material.

Further, the resin has a ratio value (hereinafter, referred to as F / B) of the weight of the fibrous base material (hereinafter, referred to as F) and a solid content of the resin (hereinafter, referred to as B) is 60/40 to 95/5. , 80/20
It is preferable that the impregnation is carried out by adjusting so as to be about 90/10. If the F / B is smaller than 60/40, the skin material obtained has a hard texture and is inferior in moldability, and if it exceeds 95/5, wear resistance, durability such as high elongation is deteriorated. It will be what you did.

Other components of the resin include, as other components, cross-linking agents for resins such as Beckamine J-103 (manufactured by Dainippon Ink and Chemicals, Inc.); Catalyst 376 (manufactured by Dainippon Ink and Chemicals, Inc.) and the like. Cross-linking catalyst of Neogen S-20, Emulgen
Surfactants such as 911 (manufactured by Kao Corporation); Nonnen B-12
1, NONNEN R-604-12 (Maruryo Yuka Kogyo Co., Ltd.) and other flame retardants; Serogen WS-C (Daiichi Kogyo Seiyaku Co., Ltd., PVA)
(Manufactured by Kuraray Co., Ltd.) and other thickeners; sodium pyrophosphate,
A pH adjusting agent such as aqueous ammonia may be appropriately added and used within a range not exceeding 50 parts by weight with respect to 100 parts by weight of the resin.

Thus, although the skin material is formed, a resin print may be applied to the surface of the skin material opposite to the resin-impregnated surface in order to enhance abrasion resistance and impart a decorative effect. Examples of the resin print include acrylic resin and polyester resin, and the amount thereof is adjusted to 5 to 15 g / m ² before use.

In addition, it is desirable that the obtained skin material has a thickness of 3.0 mm or less and a basis weight of 300 g / m ² or less in terms of workability such as weight reduction and molding. On the other hand, from the viewpoint of durability and strength, etc. The thickness is
It is preferably 1.0 mm or more and the basis weight is 120 g / m ² or more.

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

Example 1 After forming a web composed of polyester fibers (fineness: 3 denier, fiber length: 64 mm), using organ # 40S needle # 40S, needle punch density of 250 needles / cm ² , needle depth of 8 mm Needle punching was performed to obtain punch felt nonwoven fabric (weight: 170 g / m ² , thickness: 3 mm). 85% by weight of vinyl chloride on one surface of the punch felt non-woven fabric obtained next
Fleece consisting of Wacker MP Fiber (registered trademark, manufactured by Wacker, fineness: 3 denier, fiber length: 40 mm), which is a copolymer fiber of 15% by weight and vinyl acetate (weight: 30 g / superimposing m ^2, punch felt Wacker MP3 fibers on the opposite surface integrated Wacker MP3 fibers so as not out of the nonwoven fabric, followed Organ Co. needle # 40S on the surface of the Wacker MP3 fibers, Needle depth 5 mm, needle density 50 /
Needle punching under the condition of cm ² and adjusting the resin emulsion shown in Table 1 from the surface of punch felt nonwoven fabric and Wacker MPF fiber so that the thickness of impregnated layer of punch felt nonwoven fabric is about 2.0 mm. And applied, and then dried with a dryer to obtain a skin material.

As the physical properties of the obtained skin material, two sheets of skin material were overlapped and welded, and peeling strengths when the back surfaces were overlapped or when the front surface and the back surface were overlapped were determined according to the following methods.

(Peeling strength) (i) Peeling strength when the back surfaces of the skin materials are overlapped with each other, one skin material (1) and one skin material (2) are prepared,
Sun visor (3) having the cross-sectional shape shown in FIG.
The backsides (4) and (5) of the skin materials (1) and (2) are placed on the upper surface of the sun visor (3) so that they are in contact with each other, and a high frequency welder (manufactured by Seidensha Denshi Kogyo Co., Ltd., product number: KW-4000T) was used to perform high-frequency welding with a plate having a seal portion width of 3 mm, and the two skin materials (1) and (2) were integrated.

(Ii) Peeling strength when the front surface and the back surface of the skin material are overlapped with each other. In the above (i), the high frequency welder processing is performed in the same manner as in the above (i) except that the skin material (1) on the upper surface is turned over. gave.

The skin materials (1) and (2) of the sun visor (3) provided with the skin materials (1) and (2) obtained as described above are arranged so that the seal portion is parallel to the width direction. A 2.5 cm width was cut into a test piece, and the unsealed portion of the test piece was fixed to a chuck of a tensile tester, and the strength when peeled 180 ° was measured. The results are also shown in Table 1.

Example 2 The punch felt nonwoven fabric obtained in Example 1 was impregnated with the resin emulsion shown in Table 1 by adjusting the coating amount as shown in Table 1, and impregnating it with a wacker.・ Fiber web made of MPF fiber 30g / m ²
A non-woven fabric partially heat-sealed with an embossing calender at a temperature of 110 to 150 ° C. was laminated, and this was further heat-sealed with a heat calender to be integrated to prepare a skin material. Then, the peel strength was examined in the same manner as in Example 1. The results are also shown in Table 1.

Comparative Examples 1 and 2 The resin emulsion shown in Table 1 was impregnated on one surface of the punched felt nonwoven fabric obtained in Example 1 so that the thickness of the impregnated layer of the punched felt nonwoven fabric was about 2.0 mm,
Dry at 125-150 ° C for 5 minutes in a dryer to make a skin material,
Then, the peel strength was examined in the same manner as in Example 1. The results are also shown in Table 1. The thickness of the seal portion of the skin material due to the welding process was small and the film was not formed into a film.

Comparative Examples 3 and 4 In Comparative Examples 1 and 2, a resin emulsion was added to a flame retardant (Flamgart VF-82; Dainippon Ink and Chemicals, Inc.).
Manufactured) and adjusted to have the composition shown in Table 1,
The punch felt nonwoven fabric obtained in Example 1 was impregnated so that the impregnated layer of the punch felt nonwoven fabric had a thickness of about 2.0 mm, and heated with a band dryer at 130 to 140 ° C. for 2 to 3 minutes. Effervescent powder (Micro Fair F-
30; Matsumoto Yushi-Seiyaku Co., Ltd.) was foamed, then calendered (temperature: 100 to 120 ° C., pressure: 15 to 20 kg / cm ² ) to give a skin material, and then as in Example 1. Then, the peel strength was examined. The results are also shown in Table 1. The seal portion of this skin material was not formed into a film as in Comparative Examples 1 and 2.

The peeling strength of the skin material currently used in automobiles that requires high-frequency welding is required to be 6 kg / 2.5 cm width or more, but as is clear from the results shown in Table 1, the welder of the comparative example is shown. In the method using a resin having a good property, sufficient peeling strength cannot be obtained even if the amount of the resin is increased, and only the skin material of the present invention obtained in Examples 1 and 2 can satisfy such strength. I know there is. In addition, in all of the skin materials of Comparative Examples, the seal portion formed by the welding process did not form a film, the cut property was poor, and the appearance of the obtained interior material was not good.

[Effects of the Invention] The skin material for an automobile interior material of the present invention has a fiber layer made of a copolymer of vinyl chloride and vinyl acetate provided on one surface of a fibrous base material, and the one of the fibrous base materials is provided. The surface material can be easily manufactured by simply impregnating the surface with resin, and the obtained skin material has high-frequency welder properties without requiring a special processing step, and can be welded without spark phenomenon. Peel strength after 6 kg / 2.
Since it has a width of 5 cm or more, it can be suitably used as a skin material for automobile interior materials.

[Brief description of drawings]

FIG. 1 shows Examples 1 and 2 of the present invention and Comparative Examples 1 to 1.
4 is a schematic cross-sectional view of a sun visor used for examining the peel strength of the skin material obtained in 4. (Symbols in the drawing) (1), (2): Skin material (3): Sun visor

Claims (4)

[Claims] 1. A vinyl chloride 80 to 80
A skin material for an automobile interior material, which has a fiber layer made of a copolymer of 90% by weight and 20 to 10% by weight of vinyl acetate, and at least one surface of the fibrous base material is impregnated with a resin. 2. A skin material for an automobile interior material according to claim 1, which has a peel strength of 6 kg / 2.5 cm width or more. 3. A skin material for an automobile interior material according to claim 1, wherein the fibrous base material is a needle punched nonwoven fabric. 4. The skin material for an automobile interior material according to claim 3, wherein the needle punched nonwoven fabric is a needle punched nonwoven fabric made of polyester fiber.