JPH06297624A - Automobile interior finish material - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an automobile interior material having a skin made of vinyl chloride resin having excellent heat resistance. [Structure] A skin formed from a vinyl chloride resin powder composition containing hydrotalcite from which water of crystallization has been removed and perchloric acid and a foamed polyurethane layer, or formed between the skin and the foamed polyurethane layer. An automobile interior material provided with a foamed vinyl chloride resin layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automobile interior materials such as instrument panels, console boxes and headrests.

[0002]

2. Description of the Related Art Automotive interior materials such as instrument panels, console boxes and headrests are usually composed of a vinyl chloride resin skin having a leather pattern or stitch pattern and a polyurethane foam layer, or have a soft feel. In order to give a feeling, it is made of a material in which a foamed vinyl chloride resin layer is provided between the skin and the urethane foam layer. Such an interior material is a method of bonding a vinyl chloride resin skin by powder slush molding or a film having a foamed vinyl chloride resin layer under the skin and a foamed polyurethane layer separately molded with an adhesive, or by the molding method. A vinyl chloride resin skin is placed in a mold for forming a foamed polyurethane layer, and the vinyl chloride resin skin and the polyurethane layer are integrally molded.

The temperature of the interior material is 70 to 100 ° C.
Under the climatic conditions in summer reaching as high as possible, there is a problem that the vinyl chloride resin skin deteriorates with time, and the flexibility of the skin is impaired or discolored, and improvement thereof has been desired.
It was known that the deterioration is promoted by the migration of the amine compound present in the polyurethane film to the skin side of the vinyl chloride resin, but it is effective in suppressing the thermal deterioration of the vinyl chloride resin promoted by such amine. No means have been found.

That is, in the vinyl chloride resin powder composition conventionally used for the above-mentioned vinyl chloride resin skin, perchlorates of various metals, organotin compounds, various metal soaps or organic phosphites are used. Two or more kinds of heat stabilizers such as a series compound are usually used in combination, and the vinyl chloride resin powder composition containing such a stabilizer has good heat stability during film forming by powder slush molding. But,
It was not sufficient to suppress the gradual thermal deterioration under the above conditions.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automobile interior material which suppresses the thermal deterioration of the vinyl chloride resin skin caused by the catalytic action of amine under the conditions of about 100 ° C. as described above. did.

[Means for Solving the Problems]

As a result of intensive studies to solve the above problems, the present inventors have found that hydrotalcite and perchlorate from which water of crystallization has been removed are essential as a composition for molding a vinyl chloride resin film on the surface skin. By using the vinyl chloride resin composition containing as a heat stabilizer, the temperature of 100 ° C. in contact with the urethane foam layer containing a trace amount of amine
The inventors have found that a vinyl chloride resin film can be obtained in which physical properties are hardly deteriorated even after being exposed to the temperature conditions of before and after for a long time, and have completed the present invention. That is, the present invention is
It comprises a skin formed from a vinyl chloride resin powder composition containing hydrotalcite and perchlorate from which water of crystallization has been removed, and a foamed polyurethane layer, or a foamed chloride is formed between the skin and the foamed polyurethane layer. An automobile interior material provided with a vinyl-based resin layer.

The present invention will be described in more detail below. The vinyl chloride-based resin powder composition forming the skin in the present invention is preferably a powder composition suitable for powder slush molding, specifically, a vinyl chloride-based resin powder and a plasticizer as a main component, and a crystal. It is a composition in which hydrotalcite from which water is removed (hereinafter referred to as anhydrous hydrotalcite) and perchlorate are blended as a heat stabilizer. Conventionally, the vinyl chloride-based resin powder composition that was used to mold the skin for interior materials was also blended with a heat stabilizer as an essential component, as described above, but the present invention is a heat stabilizer. Is characterized in that anhydrous hydrotalcite and perchlorate are used in combination.

Anhydrous hydrotalcite is obtained by heating hydrotalcite represented by the following general formula and containing water of crystallization as mH ₂ O at 185 to 230 ° C. ^{_{M 2+ 1-X M 3+ X}} (OH) 2 A n- X / n · mH 2 O ( wherein, M ^2+, M ³⁺ ─ and m etc. are as follows. M ²⁺ : Mg ²⁺ or Zn ²⁺ 2 divalent metal ions M ³⁺ such: trivalent metal ions Al ^3+, etc. a ^n-: CO ₃ ^2-or SO ₄ ^2-like anions x: 0 <x < 0.5 n: positive number from 1 to 4 m: 0 <m <2)

As anhydrous hydrotalcite, commercially available products such as Alkamizer 4-2 and Alkamizer 7-2 manufactured by Kyowa Chemical Industry Co., Ltd. can be used. With hydrotalcite containing water of crystallization, even if it is used in combination with a perchlorate, it is not possible to sufficiently prevent the thermal deterioration of the vinyl chloride resin film promoted by the amine under the conditions of about 100 ° C.

The preferred amount of anhydrous hydrotalcite used is 0.5-10 per 100 parts by weight of vinyl chloride resin.
Parts by weight, and more preferably 2 to 8 parts by weight. If the amount used is less than 0.5 parts by weight, the effect of the addition will not be exhibited, while if it exceeds 10 parts by weight, the mechanical strength of the molded product will significantly decrease.

Examples of the perchlorate used in combination with the anhydrous hydrotalcite include zinc perchlorate, potassium perchlorate, sodium perchlorate, barium perchlorate, calcium perchlorate and aluminum perchlorate. Named
Preferred are sodium perchlorate and barium perchlorate. The amount of perchlorate used is preferably 0.05 to 2 parts by weight, and more preferably 0.2 to 2 parts by weight, based on 100 parts by weight of the vinyl chloride resin. Even if the perchlorate exceeds 2 parts by weight, the thermal stability is not improved and the perchlorate easily bleeds onto the surface of the epidermis.

In the present invention, it is preferable to use a heat stabilizer other than the above-mentioned anhydrous hydrotalcite and perchlorate in combination. Preferred heat stabilizers to be used in combination include composite metal soap such as barium-zinc composite soap and stearin. Metal soaps such as sodium acidate, sodium oleate, barium stearate, barium oleate, zinc stearate and sodium laurate, organic phosphite compounds such as trisnonylphenyl phosphite and dehydrobenzoyl acetic acid, stearoyl benzoyl methane, dibenzoyl methane And β-diketone compounds such as dehydroacetic acid. These alone or 2
They can be used in combination of two or more kinds, and the preferable amount is 0.05-2 per 100 parts by weight of vinyl chloride resin.
It is about part by weight. Of the above stabilizers, particularly preferably,
It is a composite metal soap such as barium-zinc composite soap, and specific examples thereof include Mark AC-212 manufactured by Asahi Denka Co., Ltd.

The vinyl chloride resin powder preferably has an average particle size of 100 to 150 μm, and the vinyl chloride resin preferably has a polymerization degree of 700 to 1,500. As the vinyl chloride-based resin, of course, a vinyl chloride homopolymer can be used, but a vinyl chloride-based copolymer composed of vinyl chloride and another copolymerizable monomer may be used. Vinylidene chloride and other halogenated vinyl monomers, butyl acrylate, ethyl acrylate, methyl acrylate and other acrylic esters, methyl methacrylate,
Methacrylic acid esters such as glycidyl methacrylate,
Examples thereof include vinyl carboxylates such as vinyl acetate and alkyl vinyl ethers such as cetyl vinyl ether and isobutyl vinyl ether. The amount of the copolymerization monomer used is preferably 30% by weight or less.

The plasticizer is used for the purpose of facilitating melting of the powder composition during molding and for imparting flexibility to the obtained vinyl chloride resin film, and is usually 50 per 100 parts by weight of the vinyl chloride resin. ˜100 parts by weight are added. Examples of the compound used as a plasticizer include dibutyl phthalate, -n-octyl phthalate, di-2-ethylhexyl phthalate, diisooctyl phthalate, octyldecyl phthalate, diisodecyl phthalate, n-octyl trimellitate-n- Decyl, tri-2-ethylhexyl trimellitate, triisodecyl trimellitate, di-2-ethylhexyl adipate, di-n-decyl adipate, di-2-ethylhexyl adipate, dibutyl sebacate and di-2-sebacate. Examples include ethylhexyl and the like.

In addition to the above components, a coloring pigment and, if necessary, calcium carbonate, barium sulfate, zinc white,
Extender pigments such as silica and silica sand powder can also be used. The amount of pigment added is 100 parts by weight of vinyl chloride resin,
It is preferably 20 parts by weight or less. It is also preferable to add an ultraviolet absorber. The vinyl chloride resin powder composition in the present invention uses a high-speed mixer equipped with a heating jacket, such as a Henschel mixer, into which the components of the previous period are added and the temperature is about 100 to 150 ° C.
It can be adjusted by an operation of mixing for about 40 minutes.

As a method for forming a skin for an automobile interior material using the powder composition obtained by the above method,
The powder slush molding method is preferable, and specifically 20
With the powder slush molding die heated to 0 to 240 ° C., a skin having a thickness of about 0.2 to 1.2 mm can be obtained. Following the molding of the skin, a powder composition for a foamed vinyl chloride resin layer containing azocarbonamide or the like as a foaming agent was introduced into the mold, and a film thickness of 0.4 to 4 was similarly obtained by a slush molding method. A 2 mm foamed vinyl chloride resin layer can be provided.

The skin obtained by the above method or the skin lined with a foamed vinyl chloride resin layer is set at a predetermined position of a mold for forming a urethane foam layer, and then a mixture containing a polyol and an isocyanate as a main component is injected. Then, by forming a rigid or semi-rigid polyurethane foam layer,
Automotive interior materials can be obtained. The preferred thickness of the polyurethane foam layer is about 6 to 12 mm.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

【Example】

<Example 1> Vinyl chloride resin having an average particle size of 100 to 150 μm (manufactured by Toagosei Chemical Industry Co., Ltd .; degree of polymerization: 800) 10
Per 0 parts by weight, 75 parts by weight of phthalate ester, 5 parts by weight of epoxidized linseed oil, 0.8 parts by weight of barium perchlorate, 3 parts by weight of anhydrous hydrotalcite [Alkamizer 4-produced by Kyowa Chemical Industry Co., Ltd.] 2], 0.5 parts by weight of barium zinc complex soap, 1 part by weight of trisnonyl phosphite, and 1.5 parts by weight of a pigment (a mixture of titanium oxide, carbon black and a blue color pigment) are mixed with a heating jacket. Add it to the Henschel mixer at a temperature of 10
The mixture was stirred and mixed at 0 to 110 ° C. for about 20 minutes.

After stirring and mixing were stopped and cooled, 10 parts by weight of a vinyl chloride resin (emulsion polymerized product) having an average particle size of 0.5 to 3 μm and a degree of polymerization of 1000 was added and stirred, followed by classification with a 42 mesh sieve. , A powder composition for skin forming was produced. The powder composition was put into a powder slush molding die heated to 220 ° C. to prepare a skin having a thickness of about 1 mm.
The obtained skin was transferred to a urethane injection mold, and urethane resin was injected and foamed to form a foamed urethane layer having a thickness of 10 mm. The obtained interior material was evaluated for heat resistance at 120 ° C., and the results are shown in Table 1. In addition,
The color difference in Table 1 is Macbeth COLOR-EYE70.
00 is the difference in color tone between before and after the heat resistance test of the epidermis, measured by a device.

<Example 2> The same composition as in Example 1 except that Alkamizer 7-2 [anhydrohydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.] was used instead of Alkamizer 4-2. A powder composition was produced by operation. Thereafter, the same operation as in Example 1 was carried out to evaluate the heat resistance of the epidermis.

Comparative Example 1 The same method as in Example 1 except that hydrotalcite containing water of crystallization [Alkamizer 4 manufactured by Kyowa Chemical Industry Co., Ltd.] was used in place of Alkamizer 4-2. To produce a powder composition. Less than,
The heat resistance of the epidermis was evaluated in the same manner as in Example 1.

[0022]

[Table 1]

[0023]

INDUSTRIAL APPLICABILITY In an automobile interior material having a hard or semi-rigid polyurethane foam layer as a base material and a vinyl chloride resin skin provided on the surface thereof, anhydrous hydrotalcite and an anhydrous hydrotalcite are used as the powder composition for forming the skin. According to the present invention, which uses a vinyl chloride resin powder composition containing two components of perchlorate as an essential component, even if the vinyl chloride resin powder composition is kept at a temperature of 100 to 120 ° C. for a long time, thermal deterioration of the skin is extremely small.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location // B29K 75:00 105: 04 B29L 31:58 4F (72) Inventor Nobuhiko Ando Nagoya City, Aichi Prefecture 1 Toago Synthetic Chemical Industry Co., Ltd., Nagoya Research Institute, Minami-ku, Toagosei Chemical Industry Co., Ltd. (72) Inventor Yoshito Fujiki 1 Touna Synthetic Chemical Industry Co., Ltd. Nagoya Research Institute, Nagoya City, Aichi Prefecture In the office

Claims (1)

[Claims] 1. A skin and a foamed polyurethane layer formed from a vinyl chloride resin powder composition containing hydrotalcite from which water of crystallization has been removed and a perchlorate, or the skin and a foamed polyurethane layer. An automobile interior material with a foamed vinyl chloride resin layer provided in the middle of.