JPH07179614A - Interior material for vehicle - Google Patents

Abstract

PURPOSE:To obtain an interior material excellent in soundproof, vibration- damping and shock-absorbing performances. CONSTITUTION:This material excellent in soundproof, vibration-damping, and shock-absorbing performances is produced from a polymer blend mainly comprising an org. polymer material having a continuos three-dimensional network structure and a low-molecular material in an amt. larger than that of the polymer material. The polymer blend is produced at a high productivity and a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior material, and in particular, for soundproofing, absorbing vibration, and absorbing impact at the time of collision,
The present invention relates to a vehicle interior material used for a vehicle floor, a door, an instrument panel, or the like.

[0002]

2. Description of the Related Art Rubber floors or resin interiors for vehicles are distributed on the floors, doors, instrument panels, etc. of automobiles for the purpose of soundproofing, vibration absorption, and shock absorption in the event of a collision. ing.

[0003]

In recent years, with the development of high performance automobiles, further improvement in soundproofing, vibration absorption and shock absorption performance has been demanded for vehicle interior materials provided in automobiles.

The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide an interior material for a vehicle which is remarkably excellent in soundproofing, vibration absorption and shock absorption performance.

[0005]

The interior material for a vehicle according to claim 1 is mainly composed of a high molecular weight organic material and a low molecular weight material, and the content of the high molecular weight organic material is lower than that of the low molecular weight material. The polymer blend material is characterized in that the polymer organic material is formed by using a polymer blend material having a three-dimensional continuous network skeleton structure.

That is, the inventors of the present invention have conducted extensive studies as to interior materials for vehicles having excellent soundproofing, vibration absorption and shock absorption properties, and as a result, the polymer blend material according to the present invention has extremely good characteristics. However, they have found that an extremely excellent interior material for a vehicle can be obtained by using this polymer blend material, and completed the present invention.

The present invention will be described in detail below.

In the present invention, the high molecular weight organic material has a number average molecular weight of 20,000 or more, particularly 30,000.
A thermoplastic high molecular weight organic material of 0 or more, particularly 40,000 or more is preferable, and examples thereof include styrene-based (butadiene styrene-based, isoprene styrene-based), vinyl chloride-based, olefin-based (butadiene-based, isoprene-based, ethylene propylene-based). Etc.), ester-based, amide-based, urethane-based and other various thermoplastic elastomers, and their hydrogenated and other modified products, styrene-based, ABS-based,
Olefin series (ethylene series, propylene series, ethylene propylene series, ethylene styrene series, propylene styrene series, etc.), vinyl chloride series, acrylic ester series (methyl acrylate series, etc.), methacrylic acid ester series (methyl methacrylate series, etc.) , Carbonate type, acetal type, nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type, etc.), cellulose Examples thereof include thermoplastic resins such as resins (acetyl cellulose, ethyl cellulose, etc.), vinylidene, vinyl butyral, alkylene oxides (propylene oxide, etc.), and rubber modified products of these resins.

As the thermoplastic polymer material, it is particularly preferable to use a material in which a portion that easily forms a hard block such as a crystal structure or an agglomerate structure and a soft block such as an amorphous structure are mixed together. Specifically,
The following (i) to (iii) are mentioned.

(I) Block copolymer of polyethylene and ethylene-styrene random copolymer obtained by hydrogenating a block copolymer of polybutadiene and butadiene-styrene random copolymer (ii) Polybutadiene and polystyrene Block copolymer of, or a block copolymer of polyethylene and polystyrene obtained by hydrogenating a block copolymer of polybutadiene or ethylene-butadiene random copolymer and polystyrene (iii) ethylene-propylene rubber Particularly, those having a block copolymer structure of polyethylene and an ethylene-styrene random copolymer are preferable.

These various kinds of thermoplastic polymer organic materials are mainly used alone, but two or more kinds may be blended and used.

On the other hand, as the low molecular weight material, the viscosity at 100 ° C. is not more than 5 × 10 ⁵ centipoise, especially 1 × 10 5.
It is preferably ⁵ centipoise or less, and from the viewpoint of molecular weight, the number average molecular weight of the low molecular weight material is 20,0.
00 or less, especially 10,000 or less, especially 5,000
The following is preferable. As such a low molecular weight material, a material that is liquid or liquid at room temperature is usually preferably used. Further, both hydrophilic and hydrophobic low molecular weight materials can be used. The low molecular weight material is not particularly limited, but the following materials are suitable.

Softeners: Mineral oil-based, vegetable oil-based, synthetic-based softeners for various rubbers or resins. Examples of the mineral oil-based oil include process oils such as aromatic oils, naphthene oils, and paraffin oils. As vegetable oils, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil,
Examples include coconut oil, peanut oil, wood wax, pine oil, olive oil and the like.

Plasticizers: various ester plasticizers such as phthalic acid esters, mixed phthalic acid esters, aliphatic dibasic acid esters, glycol esters, fatty acid esters, phosphoric acid esters, stearic acid esters, epoxy plasticizers, etc. Plasticizer for plastics or phthalate type,
Adipate-based, sebacate-based, phosphate-based, polyether-based, polyester-based, etc. plasticizers for NBR.

Tackifier: Various tackifiers such as coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivative and the like.

Oligomer: Crown ether, fluorine-containing oligomer, polyisobutylene, xylene resin, chlorinated rubber, polyethylene wax, petroleum resin, rosin ester rubber, polyalkylene glycol diacrylate,
Liquid rubber (polybutadiene, styrene-butadiene rubber, butadiene-acrylonitrile rubber, polychloroprene, etc.), silicone-based oligomers, various oligomers such as poly-α-olefins.

Lubricants: Hydrocarbon lubricants such as paraffin and wax, fatty acid lubricants such as higher fatty acids and oxyfatty acids, fatty acid amide lubricants such as fatty acid amides and alkylenebisfatty acid amides, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters. , Ester-based lubricants such as fatty acid polyglycol esters, alcohol-based lubricants such as fatty alcohols, polyhydric alcohols, polyglycols and polyglycerols, various lubricants such as metal soaps and mixed lubricants.

In addition, latex, emulsion, liquid crystal, bituminous composition, clay, natural starch, sugar, inorganic silicon oil, phosphazene and the like are also suitable as the low molecular weight material. Further, animal oil such as beef oil, pig oil, horse oil, bird oil or fish oil: honey, fruit juice, or dairy products such as chocolate and yogurt, hydrocarbon-based, halogenated hydrocarbon-based, alcohol-based, phenol-based, ether System, acetal system, ketone system, fatty acid system, ester system,
Nitrogen compound-based, sulfur compound-based organic solvents: or various medicinal components, soil modifiers, fertilizers, petroleum, water, aqueous solutions and the like can also be used.

These low molecular weight materials may be used alone or in combination of two or more.

In the present invention, in order to obtain a polymer blend material containing a large amount of a low molecular weight material with a large amount of a low molecular weight material and a high molecular weight organic material, the solubility of each of the low molecular weight material and the high molecular weight organic material used Parameter value δ (= ΔE /
V) ^1/2 (ΔE = molar evaporation energy, V = molar volume)
Difference of 3.0 or less, preferably 2.5 or less,
It is preferable to select both materials. If this difference exceeds 3.0, from the viewpoint of compatibility of both materials, it is difficult to retain a large amount of low molecular weight materials, which is an obstacle to lowering the elastic modulus of the obtained polymer blend material. Is likely to occur, which is not preferable.

If necessary, the polymer blend material according to the present invention may further contain the following fillers. That is, clay, diatomaceous earth, carbon black, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxides, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders,
Wood chips, glass powder, ceramics powder, granular or powder solid filler such as granular or powder polymer, other various natural or artificial short fibers, long fibers (for example, straw, hair, glass fiber, metal fiber, various other Polymer fibers and the like) can be blended.

Further, it is possible to reduce the weight by blending a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, or an organic hollow filler made of polyvinylidene fluoride, a polyvinylidene fluoride copolymer or the like. . Further, in order to improve various physical properties such as weight reduction, it is possible to mix various foaming agents, and it is also possible to mechanically inject gas during mixing or the like.

The loss tangent of the polymer blend material constituting the vehicle interior material of the present invention is preferably 0.1 or more. If this loss tangent is less than 0.1,
It is difficult to obtain sufficient soundproofing, vibration absorption and shock absorption performance.

The loss tangent is a value measured with a shear dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) under the conditions of 25 ° C. and 5 Hz.

In order to provide such a loss tangent, a three-dimensional continuous reticulated skeleton structure formed of a polymer organic material that constitutes a polymer blend material has an average diameter of 5 skeletons.
0 μm or less, preferably 30 μm or less, the average diameter of cells (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the polymer organic material is [volume of polymer organic material / (volume of polymer organic material + Volume of low molecular weight material)]
When defined as × 100 (%), it is desirable that the volume fraction of the polymer organic material be 30% or less, and particularly 25% or less.

The polymer blend material used in the present invention contains a predetermined amount of a high molecular weight organic material and a low molecular weight material, and if necessary, other compounding agents, and the high molecular weight organic material forms a three-dimensional continuous network skeleton structure. It can be obtained by mixing under possible mixing conditions. In this case, while having a uniform three-dimensional continuous network skeleton structure of a high molecular weight organic material,
In order to obtain a polymer blend material having less bleeding of low molecular weight material and satisfying the above-mentioned loss tangent, it is preferable to use a high shear type mixer as a mixer, and especially, a fixed wall and a rotating rotor Between the fixed wall and the rotating part (rotor), the clearance (clearance) is t (m), and the rotating peripheral speed of the rotor is v (m / sec). , If the shear rate V of the rotor is defined as V = v / t (sec ⁻¹ ), then V ≧ 5.0 × 10 ² (sec ⁻¹ ) and preferably V ≧ 1.0 × 10 ³ (sec ⁻¹ ). More preferably, it is advantageous to use a high shear type special mixer that satisfies V ≧ 2.5 × 10 ³ (sec ⁻¹ ) and most preferably V ≧ 5.0 × 10 ³ (sec ⁻¹ ).

The polymer blend material according to the present invention is not particularly limited, such as ordinary bulk, gel, foam, etc., but it is in a gel state, in particular, a three-dimensional continuous uniform network made of a thermoplastic polymer material. Those in a gel state having a skeletal structure are particularly effective for the present invention.

The structure of the vehicle interior material of the present invention is not particularly limited, and may be composed only of the above-mentioned polymer blend material, or may be polyurethane, vinyl chloride,
It may be used in combination with existing polymer materials such as polypropylene or foams thereof in a laminated structure. Further, it may be used in combination with metal materials such as iron, aluminum, copper, zinc, stainless steel and various ceramic materials. Further, the surface layer of the polymer blend material may be coated with a urethane-based, polyvinyl acetate-based, silicone-based, or other organic material, cloth, leather, or the like.

The vehicle interior material of the present invention can be effectively used as a vehicle interior material for vehicles such as automobiles, trains, floors, doors, instrument panels, and ceilings.

[0030]

[Function] Mainly composed of high molecular weight organic materials and low molecular weight materials,
A polymer blend material having a high content of high molecular weight organic materials lower than that of low molecular weight materials, in which the high molecular weight organic material has a three-dimensional continuous network skeleton structure, is superior in sound insulation and vibration. It exhibits absorption and shock absorption performance, and exhibits excellent properties such as elasticity, compression characteristics and hardness as an interior material for vehicles. Moreover, it can be manufactured economically with high productivity. In particular, when a thermoplastic polymer organic material is used, a vibration damping material having excellent moldability and recyclability is provided.

[0031]

EXAMPLES The present invention will be described in more detail with reference to the following examples.

Example 1 The materials shown in Table 1 are shown in Table 1 by using a high shear type special mixer (“TK Auto Homo Mixer” manufactured by Tokushu Kika Kogyo Co., Ltd.) with the composition shown in Table 1. Mixing under mixing conditions gave a polymer blend material with a uniform appearance.

After the completion of mixing, the obtained polymer blend material was molded into a sheet having a thickness of 15 mm, cut into an arbitrary size, and placed inside a skin material as an interior material for an automobile door.

The obtained door is extremely soundproof, absorbs vibration,
It had excellent shock absorption performance and excellent passenger protection.

The loss tangent of this polymer blend material is 0.
25, and when a section of this polymer blend material was cut out and observed with an optical microscope, a three-dimensional continuous network structure composed of a thermoplastic polymer organic material (average skeleton diameter 8 μm, average cell diameter 20 μm) Was confirmed to have been formed.

[0036]

[Table 1]

[0037]

As described in detail above, according to the vehicle interior material of the present invention, a vehicle interior material that is remarkably excellent in soundproofing, vibration absorption and shock absorption performance is provided. Moreover, the polymer blend material according to the present invention can be produced with high productivity and is excellent in economic efficiency.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08L 101: 00 (72) Inventor Yuichiro Wakana 3-5-5 Ogawa Higashicho, Kodaira-shi, Tokyo (72) Inventor Mihide Fukahori 2-9-7 Sanada-cho, Hachioji-shi, Tokyo

Claims (1)

[Claims] 1. A polymer blend material comprising a high molecular weight organic material and a low molecular weight material as main components, wherein the content of the high molecular weight organic material is lower than that of the low molecular weight material, and the high molecular weight organic material is a tertiary compound. An interior material for a vehicle, which is formed by using a polymer blend material having an original continuous network skeleton structure.